/* ============================================================
   LernStar – Main Stylesheet
   ============================================================ */

:root {
  --topnav-h: 64px;
  --sidebar-w: 280px;
  --radius: 16px;
  --radius-sm: 10px;
  --shadow: 0 4px 24px rgba(0,0,0,.08);
  --shadow-lg: 0 8px 40px rgba(0,0,0,.14);
  --transition: .22s cubic-bezier(.4,0,.2,1);
  --font-main: 'Nunito', sans-serif;
  --font-head: 'Poppins', sans-serif;
  --bg: #F4F6FB;
  --surface: #ffffff;
  --text: #1a1a2e;
  --text-muted: #6b7280;
  --border: #e5e7eb;
  --accent: #7C3AED;
  --accent-light: #EDE9FE;
}

/* Grade color variables (set via JS on body) */
body[data-grade="5"]  { --gc: #7C3AED; --gc2: #A855F7; --gl: #EDE9FE; }
body[data-grade="6"]  { --gc: #2563EB; --gc2: #60A5FA; --gl: #DBEAFE; }
body[data-grade="7"]  { --gc: #0D9488; --gc2: #2DD4BF; --gl: #CCFBF1; }
body[data-grade="8"]  { --gc: #059669; --gc2: #34D399; --gl: #D1FAE5; }
body[data-grade="9"]  { --gc: #D97706; --gc2: #FBBF24; --gl: #FEF3C7; }
body[data-grade="10"] { --gc: #DC2626; --gc2: #F87171; --gl: #FEE2E2; }

/* ---- Global utility ---- */
.hidden { display: none !important; }

/* ---- Reset & Base ---- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-main);
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  overflow-x: hidden;
}

h1,h2,h3,h4 { font-family: var(--font-head); }
button { cursor: pointer; border: none; background: none; font-family: inherit; }
a { text-decoration: none; color: inherit; }
ul { list-style: none; }

/* ============================================================
   TOP NAV
   ============================================================ */
.topnav {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--topnav-h);
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  z-index: 100;
  box-shadow: 0 2px 12px rgba(0,0,0,.06);
}
.topnav-inner {
  display: flex;
  align-items: center;
  gap: 16px;
  height: 100%;
  padding: 0 24px;
}

.sidebar-toggle {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
  border-radius: 8px;
  transition: background var(--transition);
}
.sidebar-toggle:hover { background: var(--bg); }
.sidebar-toggle span {
  display: block;
  width: 22px; height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: var(--transition);
}

.logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 1.3rem;
  color: var(--text);
}
.logo-star { font-size: 1.4rem; animation: spin 4s linear infinite; }
@keyframes spin { 0%,100%{transform:rotate(0)} 50%{transform:rotate(20deg)} }
.logo-text { background: linear-gradient(135deg,#7C3AED,#06B6D4); -webkit-background-clip:text; -webkit-text-fill-color:transparent; }

.home-btn {
  margin-left: auto;
  padding: 8px 18px;
  border-radius: 30px;
  background: linear-gradient(135deg, #7C3AED, #06B6D4);
  color: #fff;
  font-weight: 700;
  font-size: .9rem;
  transition: transform var(--transition), box-shadow var(--transition);
  box-shadow: 0 4px 14px rgba(124,58,237,.3);
}
.home-btn:hover { transform: translateY(-2px); box-shadow: 0 6px 20px rgba(124,58,237,.4); }

/* ============================================================
   SIDEBAR
   ============================================================ */
.sidebar {
  position: fixed;
  top: 0; left: 0;
  width: var(--sidebar-w);
  height: 100vh;
  background: var(--surface);
  border-right: 1px solid var(--border);
  z-index: 200;
  display: flex;
  flex-direction: column;
  transform: translateX(-100%);
  transition: transform var(--transition);
  box-shadow: var(--shadow-lg);
}
.sidebar.open { transform: translateX(0); }

.sidebar-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.4);
  z-index: 190;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition);
}
.sidebar-overlay.show { opacity: 1; pointer-events: all; }

.sidebar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 20px 16px;
  border-bottom: 1px solid var(--border);
}
.sidebar-title { font-weight: 800; font-size: 1rem; }
.sidebar-close {
  width: 30px; height: 30px;
  border-radius: 50%;
  display: flex; align-items:center; justify-content:center;
  font-size: .9rem;
  color: var(--text-muted);
  transition: background var(--transition);
}
.sidebar-close:hover { background: var(--bg); }

.sidebar-nav { flex:1; overflow-y:auto; padding:16px 0; }
.sidebar-section { margin-bottom: 8px; }
.sidebar-label {
  padding: 6px 20px;
  font-size: .72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .08em;
  color: var(--text-muted);
}
.sidebar-nav ul li a {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 20px;
  border-radius: 0 30px 30px 0;
  margin-right: 12px;
  font-weight: 600;
  font-size: .92rem;
  transition: background var(--transition), color var(--transition);
}
.sidebar-nav ul li a:hover { background: var(--gl,#EDE9FE); color: var(--gc,#7C3AED); }
.sidebar-nav ul li a.active { background: var(--gc,#7C3AED); color: #fff; }

.sidebar-footer {
  padding: 16px 20px;
  border-top: 1px solid var(--border);
}
.progress-label { font-size:.8rem; font-weight:700; margin-bottom:6px; display:block; }
.progress-bar-wrap { height:8px; background:var(--border); border-radius:8px; overflow:hidden; }
.progress-bar-fill { height:100%; background:linear-gradient(90deg,#7C3AED,#06B6D4); border-radius:8px; width:0; transition:width .5s; }
.progress-pct { font-size:.75rem; color:var(--text-muted); display:block; text-align:right; margin-top:4px; }

/* ============================================================
   MAIN CONTENT
   ============================================================ */
.main-content {
  margin-top: var(--topnav-h);
  min-height: calc(100vh - var(--topnav-h));
  padding: 0;
}

.view { display:block; }
.view.hidden { display:none; }

/* ============================================================
   HOME – HERO
   ============================================================ */
.hero {
  background: linear-gradient(135deg, #0f0c29 0%, #302b63 50%, #24243e 100%);
  color: #fff;
  padding: 80px 40px 60px;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.hero::before {
  content:'';
  position:absolute;
  inset:0;
  background: radial-gradient(ellipse at 30% 50%, rgba(124,58,237,.5) 0%, transparent 60%),
              radial-gradient(ellipse at 70% 50%, rgba(6,182,212,.3) 0%, transparent 60%);
}
.hero > * { position:relative; z-index:1; }
.hero-badge {
  display:inline-block;
  padding:6px 16px;
  background:rgba(255,255,255,.15);
  border:1px solid rgba(255,255,255,.25);
  border-radius:30px;
  font-size:.82rem;
  font-weight:700;
  letter-spacing:.04em;
  margin-bottom:24px;
  backdrop-filter:blur(10px);
}
.hero-title {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 900;
  line-height: 1.15;
  margin-bottom: 16px;
}
.hero-title .accent {
  background: linear-gradient(90deg,#A78BFA,#67E8F9);
  -webkit-background-clip:text;
  -webkit-text-fill-color:transparent;
}
.hero-sub {
  max-width: 560px;
  margin: 0 auto 36px;
  font-size: 1.1rem;
  color:rgba(255,255,255,.8);
  line-height: 1.6;
}
.hero-stats {
  display: flex;
  justify-content: center;
  gap: 40px;
  flex-wrap: wrap;
}
.stat { text-align:center; }
.stat-num { display:block; font-size:2rem; font-weight:900; background:linear-gradient(90deg,#A78BFA,#67E8F9); -webkit-background-clip:text; -webkit-text-fill-color:transparent; }
.stat-lbl { font-size:.85rem; color:rgba(255,255,255,.6); font-weight:600; }

/* ============================================================
   SCHULFORM-SELEKTOR – Karten-Design (2-Schritt-Navigation)
   ============================================================ */

/* ── SCHRITT 1: Schulform-Karten ── */
.sf-cards-section {
  max-width: 900px;
  margin: 0 auto 36px;
  padding: 0 24px;
  text-align: center;
}
.sf-cards-title {
  font-size: 1rem;
  font-weight: 700;
  color: rgba(255,255,255,.8);
  margin-bottom: 22px;
  letter-spacing: .05em;
  text-transform: uppercase;
}
.sf-cards-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
  max-width: 700px;
  margin: 0 auto;
}
.sf-card {
  background: #fff;
  border-radius: 22px;
  padding: 32px 20px 26px;
  text-align: center;
  cursor: pointer;
  border: 3px solid transparent;
  font-family: inherit;
  box-shadow: 0 6px 24px rgba(0,0,0,.12);
  transition: all .22s cubic-bezier(.4,0,.2,1);
  position: relative;
  overflow: hidden;
}
.sf-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 5px;
  border-radius: 22px 22px 0 0;
}
.sf-card-gs::before  { background: linear-gradient(90deg,#10B981,#34D399); }
.sf-card-hs::before  { background: linear-gradient(90deg,#F59E0B,#FCD34D); }
.sf-card-rs::before  { background: linear-gradient(90deg,#2563EB,#60A5FA); }
.sf-card-gym::before { background: linear-gradient(90deg,#7C3AED,#A855F7); }
.sf-card-gts::before { background: linear-gradient(90deg,#0891B2,#22D3EE); }
.sf-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 14px 40px rgba(0,0,0,.2);
}
.sf-card-gs:hover  { border-color: #10B981; }
.sf-card-hs:hover  { border-color: #F59E0B; }
.sf-card-rs:hover  { border-color: #2563EB; }
.sf-card-gym:hover { border-color: #7C3AED; }
.sf-card-gts:hover { border-color: #0891B2; }
.sf-card-icon { font-size: 3rem; line-height: 1; margin-bottom: 12px; display: block; }
.sf-card-name {
  font-size: 1.15rem;
  font-weight: 900;
  color: #1e1b4b;
  margin-bottom: 5px;
}
.sf-card-grades {
  font-size: 1rem;
  font-weight: 800;
  margin-bottom: 8px;
}
.sf-card-gs  .sf-card-grades { color: #059669; }
.sf-card-hs  .sf-card-grades { color: #D97706; }
.sf-card-rs  .sf-card-grades { color: #1D4ED8; }
.sf-card-gym .sf-card-grades { color: #7C3AED; }
.sf-card-gts .sf-card-grades { color: #0891B2; }
.sf-card-desc {
  font-size: .78rem;
  color: #64748b;
  font-weight: 600;
  line-height: 1.4;
}

/* ── Prüfungs-Banner innerhalb der Schulform-Ansicht ── */
.sf-exam-wrap {
  margin: 32px 0 8px;
  text-align: center;
}
.sf-exam-title {
  font-size: .88rem;
  font-weight: 700;
  color: rgba(255,255,255,.7);
  letter-spacing: .06em;
  text-transform: uppercase;
  margin-bottom: 16px;
}
.sf-exam-grid {
  display: flex;
  justify-content: center;
}
.sf-exam-grid .exam-quick-card {
  max-width: 420px;
  width: 100%;
}

/* ── SCHRITT 2: Klassen-Auswahl ── */
.sf-grades-section {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 24px 12px;
}
.sf-back-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(255,255,255,.18);
  border: 1.5px solid rgba(255,255,255,.4);
  color: #fff;
  border-radius: 12px;
  padding: 9px 20px;
  font-size: .9rem;
  font-weight: 700;
  cursor: pointer;
  font-family: inherit;
  margin-bottom: 22px;
  transition: all .18s;
}
.sf-back-btn:hover {
  background: rgba(255,255,255,.28);
  transform: translateX(-2px);
}
.sf-grades-title {
  font-size: 1.1rem;
  font-weight: 800;
  color: #fff;
  text-align: center;
  margin-bottom: 20px;
  opacity: .9;
}

/* 5. Karte (Gesamtschule) mittig im Grid wenn allein in einer Zeile */
.sf-cards-grid > button:last-child:nth-child(odd) {
  grid-column: 1 / -1;
  max-width: calc(50% - 6px);
  margin-left: auto;
  margin-right: auto;
}

@media (max-width: 680px) {
  .sf-cards-grid { grid-template-columns: 1fr 1fr; gap: 10px; }
  .sf-cards-grid > button:last-child:nth-child(odd) { max-width: 100%; }
  .sf-card { padding: 20px 12px 16px; }
  .sf-card-icon { font-size: 2.2rem; }
  .sf-card-name { font-size: 1rem; }
  .sf-card-grades { font-size: .9rem; }
}

/* ============================================================
   GRADE GRID
   ============================================================ */
.section-title {
  text-align:center;
  padding: 48px 24px 24px;
}
.section-title h2 { font-size:1.8rem; font-weight:800; margin-bottom:8px; }
.section-title p { color:var(--text-muted); font-size:1rem; }

.grade-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
  padding: 0 32px 48px;
  max-width: 1200px;
  margin: 0 auto;
}

.grade-card {
  border-radius: var(--radius);
  overflow: hidden;
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition);
  box-shadow: var(--shadow);
  position: relative;
}
.grade-card:hover {
  transform: translateY(-6px) scale(1.02);
  box-shadow: var(--shadow-lg);
}
.grade-card-inner {
  padding: 32px 28px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  min-height: 180px;
  color: #fff;
  position: relative;
  overflow: hidden;
}
.grade-card-inner::before {
  content:'';
  position:absolute;
  right:-20px; top:-20px;
  width:120px; height:120px;
  border-radius:50%;
  background:rgba(255,255,255,.1);
}
.grade-card-inner::after {
  content:'';
  position:absolute;
  right:20px; bottom:-30px;
  width:80px; height:80px;
  border-radius:50%;
  background:rgba(255,255,255,.07);
}
.grade-card-num {
  font-size: 3rem;
  font-weight: 900;
  line-height:1;
  opacity: .15;
  position: absolute;
  right: 24px;
  top: 16px;
}
.grade-card-emoji { font-size: 2.5rem; margin-bottom:4px; }
.grade-card-title { font-size: 1.4rem; font-weight: 800; }
.grade-card-sub { font-size: .88rem; opacity:.85; line-height:1.5; }
.grade-card-subjects {
  display:flex;
  flex-wrap:wrap;
  gap:6px;
  margin-top:8px;
}
.grade-card-tag {
  background:rgba(255,255,255,.2);
  padding:3px 10px;
  border-radius:20px;
  font-size:.75rem;
  font-weight:700;
  backdrop-filter:blur(4px);
}
.grade-card-arrow {
  position:absolute;
  bottom:20px; right:20px;
  font-size:1.4rem;
  opacity:.7;
  transition:transform var(--transition);
}
.grade-card:hover .grade-card-arrow { transform:translateX(4px); }

/* ============================================================
   FEATURES SECTION
   ============================================================ */
/* ── Prüfungs-Schnellstart auf der Startseite ─────────────── */
.exam-quick-section {
  padding: 56px 32px 48px;
  text-align: center;
  background: linear-gradient(160deg, #f5f3ff 0%, #eff6ff 100%);
}
.exam-quick-sub { color: var(--text-muted); margin: -18px 0 32px; font-size: 1rem; }
.exam-quick-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  max-width: 720px;
  margin: 0 auto;
}
.exam-quick-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding: 32px 24px 28px;
  border-radius: 20px;
  border: none;
  cursor: pointer;
  transition: transform .18s ease, box-shadow .18s ease;
  position: relative;
  overflow: hidden;
}
.exam-quick-card:hover { transform: translateY(-4px); box-shadow: 0 12px 32px rgba(0,0,0,.15); }
.exam-quick-zap {
  background: linear-gradient(135deg, #7C3AED, #4F46E5);
  color: white;
}
.exam-quick-abi {
  background: linear-gradient(135deg, #D97706, #B45309);
  color: white;
}
.eqc-icon { font-size: 2.6rem; line-height: 1; }
.eqc-title { font-size: 1.25rem; font-weight: 800; }
.eqc-sub { font-size: .82rem; opacity: .85; line-height: 1.4; }
.eqc-badge {
  margin-top: 6px;
  background: rgba(255,255,255,.22);
  border-radius: 20px;
  padding: 4px 14px;
  font-size: .75rem;
  font-weight: 700;
}
@media (max-width: 540px) {
  .exam-quick-grid { grid-template-columns: 1fr; }
  .exam-quick-section { padding: 40px 16px 32px; }
}

.features-section {
  background: var(--surface);
  padding: 60px 32px;
}
.section-heading {
  font-size: 1.6rem;
  font-weight: 800;
  text-align: center;
  margin-bottom: 32px;
}
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 24px;
  max-width: 1000px;
  margin: 0 auto;
}
.feature-card {
  background: var(--bg);
  border-radius: var(--radius);
  padding: 28px 24px;
  text-align: center;
  transition: transform var(--transition), box-shadow var(--transition);
}
.feature-card:hover { transform:translateY(-4px); box-shadow:var(--shadow); }
.feature-icon { font-size:2.5rem; margin-bottom:12px; }
.feature-card h3 { font-size:1.05rem; font-weight:800; margin-bottom:8px; }
.feature-card p { font-size:.88rem; color:var(--text-muted); line-height:1.5; }

/* ============================================================
   GRADE HERO
   ============================================================ */
.grade-hero, .subject-hero {
  padding: 48px 40px 40px;
  color: #fff;
  position: relative;
  overflow: hidden;
}
.grade-hero::before, .subject-hero::before {
  content:'';
  position:absolute;
  inset:0;
  background: radial-gradient(ellipse at 80% 50%, rgba(255,255,255,.1) 0%, transparent 60%);
}
.grade-hero > *, .subject-hero > * { position:relative; z-index:1; }
.hero-breadcrumb {
  font-size:.82rem;
  font-weight:700;
  opacity:.7;
  margin-bottom:12px;
  cursor:pointer;
}
.hero-breadcrumb:hover { opacity:1; }
.grade-hero h1, .subject-hero h1 { font-size:clamp(1.6rem,4vw,2.8rem); font-weight:900; margin-bottom:8px; }
.grade-hero p, .subject-hero p { opacity:.85; max-width:500px; font-size:1rem; line-height:1.5; }

/* ============================================================
   SUBJECT GRID
   ============================================================ */
.subject-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
  padding: 8px 32px 48px;
  max-width: 1200px;
  margin: 0 auto;
}
.subject-card {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 28px 24px;
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition);
  box-shadow: var(--shadow);
  border-top: 4px solid var(--sc, #7C3AED);
  position: relative;
  overflow: hidden;
}
.subject-card:hover { transform:translateY(-5px); box-shadow:var(--shadow-lg); }
.subject-icon { font-size:2.4rem; margin-bottom:14px; }
.subject-name { font-size:1.15rem; font-weight:800; margin-bottom:6px; }
.subject-desc { font-size:.85rem; color:var(--text-muted); line-height:1.5; margin-bottom:14px; }
.subject-topics { font-size:.78rem; font-weight:700; color:var(--sc,#7C3AED); }
.subject-arrow { position:absolute; bottom:20px; right:20px; font-size:1.2rem; color:var(--sc,#7C3AED); opacity:.6; }

/* ============================================================
   VIDEO STUDIO (Erklärvideo mit Prof. Lenny)
   ============================================================ */
.video-section { padding: 0 32px 40px; max-width: 960px; }

.video-studio {
  background: linear-gradient(135deg, #0f0c29 0%, #302b63 50%, #1a0538 100%);
  border-radius: var(--radius);
  padding: 32px 28px 24px;
  color: #fff;
  box-shadow: var(--shadow-lg), 0 0 60px rgba(124,58,237,.2);
  position: relative;
  overflow: hidden;
}

/* Background decorative orbs */
.studio-orb {
  position: absolute;
  border-radius: 50%;
  pointer-events: none;
  filter: blur(40px);
  opacity: .25;
  animation: orbFloat 6s ease-in-out infinite alternate;
}
.studio-orb-1 {
  width: 200px; height: 200px;
  background: var(--gc, #7C3AED);
  top: -60px; left: -40px;
}
.studio-orb-2 {
  width: 160px; height: 160px;
  background: #06B6D4;
  bottom: -40px; right: -20px;
  animation-delay: 2s;
}
@keyframes orbFloat {
  from { transform: translate(0, 0) scale(1); }
  to   { transform: translate(20px, 10px) scale(1.1); }
}

/* Main content row */
.studio-main {
  display: flex;
  gap: 24px;
  align-items: center;
  margin-bottom: 22px;
  position: relative;
  z-index: 1;
  flex-wrap: wrap;
}

/* ---- Mascot ---- */
.mascot-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}

/* VRM 3D Avatar */
.avatar-img {
  width: 210px;
  height: 270px;
  object-fit: contain;
  object-position: center bottom;
  display: block;
  border-radius: 12px;
}
.vrm-wrap {
  position: relative;
  width: 210px;
  height: 270px;
  filter: drop-shadow(0 12px 32px rgba(0,0,0,.55));
  transition: filter .3s;
  animation: mascotBreath 4.4s ease-in-out infinite;
}
.vrm-wrap.talking {
  animation: mascotTalk 0.42s ease-in-out infinite alternate;
  filter: drop-shadow(0 12px 32px rgba(0,0,0,.55))
          drop-shadow(0 0 32px rgba(var(--gc-rgb,124,58,237),.7))
          drop-shadow(0 0 60px rgba(var(--gc-rgb,124,58,237),.3));
}
.vrm-wrap.talking .talk-wave { opacity: 1; }
.vrm-canvas { display: none; cursor: grab; }

.vrm-canvas:active { cursor: grabbing; }
.vrm-loading {
  display: flex; flex-direction: column; align-items: center;
  justify-content: center; gap: 10px;
  width: 210px; height: 270px;
  color: rgba(255,255,255,.6); font-size: .8rem;
}
.vrm-spinner {
  width: 32px; height: 32px;
  border: 3px solid rgba(255,255,255,.15);
  border-top-color: rgba(255,255,255,.75);
  border-radius: 50%;
  animation: spin .7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* Talking wave indicator */
.talk-wave {
  position: absolute;
  bottom: 12px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  align-items: flex-end;
  gap: 5px;
  opacity: 0;
  transition: opacity .25s;
}
.talk-wave span {
  display: block;
  width: 5px;
  height: 18px;
  border-radius: 3px;
  background: rgba(255,255,255,.9);
  animation: waveDot 0.55s ease-in-out infinite;
}
.talk-wave span:nth-child(1) { animation-delay: 0s;    height: 10px; }
.talk-wave span:nth-child(2) { animation-delay: 0.13s; height: 18px; }
.talk-wave span:nth-child(3) { animation-delay: 0.26s; height: 10px; }
.avatar-frame.talking .talk-wave { opacity: 1; }
@keyframes waveDot {
  0%, 100% { transform: scaleY(0.5);  opacity: .65; }
  50%       { transform: scaleY(1.35); opacity: 1;   }
}

/* Fallback SVG */
.mascot-svg {
  width: 120px;
  height: 178px;
  filter: drop-shadow(0 10px 28px rgba(0,0,0,.55));
  display: none;
}

@keyframes mascotTalk {
  0%   { transform: translateY(0)    rotate(0deg)      scaleX(1)     scaleY(1);     }
  25%  { transform: translateY(-4px) rotate(0.5deg)    scaleX(1.008) scaleY(0.995); }
  55%  { transform: translateY(-7px) rotate(-0.3deg)   scaleX(0.996) scaleY(1.006); }
  80%  { transform: translateY(-3px) rotate(0.25deg)   scaleX(1.005) scaleY(0.998); }
  100% { transform: translateY(-2px) rotate(-0.15deg)  scaleX(1.002) scaleY(1.002); }
}

@keyframes mascotBreath {
  0%,  100% { transform: translateY(0);               }
  38%       { transform: translateY(-3px) scaleY(1.003); }
  72%       { transform: translateY(-2px);             }
}

.mascot-name-badge {
  font-size: .78rem;
  font-weight: 800;
  color: rgba(255,255,255,.8);
  background: rgba(255,255,255,.1);
  border: 1px solid rgba(255,255,255,.18);
  padding: 4px 14px;
  border-radius: 20px;
  letter-spacing: .06em;
  text-transform: uppercase;
}

/* ---- Speech bubble + visual panel ---- */
.studio-right {
  flex: 1;
  min-width: 200px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.studio-bubble {
  background: rgba(255,255,255,.1);
  border: 1px solid rgba(255,255,255,.2);
  border-radius: var(--radius-sm);
  padding: 16px 20px;
  font-size: .94rem;
  line-height: 1.65;
  min-height: 72px;
  backdrop-filter: blur(8px);
  position: relative;
}
.studio-bubble::before {
  content: '';
  position: absolute;
  left: -10px; top: 24px;
  border: 5px solid transparent;
  border-right-color: rgba(255,255,255,.2);
}

/* ---- Controls ---- */
.studio-controls {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.studio-controls-top {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}
.studio-progress-wrap {
  flex: 1;
  min-width: 120px;
  display: flex;
  align-items: center;
  gap: 10px;
}
.video-controls { display: flex; flex-direction: column; gap: 14px; }

/* Voice badge */
.voice-badge {
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:5px 14px;
  background:rgba(255,255,255,.1);
  border:1px solid rgba(255,255,255,.2);
  border-radius:30px;
  font-size:.78rem;
  font-weight:700;
  letter-spacing:.03em;
  opacity:.85;
  align-self:flex-start;
}

/* Playback row */
.playback-row {
  display:flex;
  align-items:center;
  gap:10px;
  flex-wrap:wrap;
}
.btn-ctrl {
  padding:9px 20px;
  border-radius:30px;
  font-weight:700;
  font-size:.85rem;
  border:2px solid rgba(255,255,255,.35);
  color:#fff;
  background:rgba(255,255,255,.12);
  backdrop-filter:blur(6px);
  transition:all var(--transition);
}
.btn-ctrl:hover { background:rgba(255,255,255,.22); border-color:rgba(255,255,255,.6); }
.btn-ctrl-stop { border-color:rgba(248,113,113,.6); color:#FCA5A5; }
.btn-ctrl-stop:hover { background:rgba(248,113,113,.2); }
.btn-play {
  padding:10px 24px;
  background:linear-gradient(135deg,#7C3AED,#06B6D4);
  color:#fff;
  border-radius:30px;
  font-weight:800;
  font-size:.92rem;
  transition:transform var(--transition);
  flex-shrink:0;
}
.btn-play:hover { transform:scale(1.05); }
.btn-play:disabled { opacity:.5; cursor:not-allowed; transform:none; }
.video-progress-wrap {
  flex:1;
  height:6px;
  background:rgba(255,255,255,.2);
  border-radius:6px;
  overflow:hidden;
  min-width:100px;
}
.video-progress-fill { height:100%; background:linear-gradient(90deg,#7C3AED,#06B6D4); width:0%; border-radius:6px; transition:width .2s linear; }
.video-time { font-size:.8rem; opacity:.7; flex-shrink:0; }

/* ============================================================
   TOPICS LIST
   ============================================================ */
.topics-section { padding:0 32px 32px; max-width:900px; }
.topics-list { display:flex; flex-direction:column; gap:12px; }

/* ── Kapitel-Überschriften (isChapter:true) ── */
.topic-chapter-header {
  font-size: 1rem;
  font-weight: 900;
  color: var(--gc, #7C3AED);
  margin: 20px 0 4px;
  padding: 10px 16px;
  background: var(--gl, #EDE9FE);
  border-left: 4px solid var(--gc, #7C3AED);
  border-radius: 0 10px 10px 0;
  letter-spacing: .02em;
  text-transform: none;
}
.topic-chapter-header:first-child { margin-top: 4px; }

.topic-item {
  background:var(--surface);
  border-radius:var(--radius-sm);
  padding:16px 20px;
  display:flex;
  align-items:center;
  gap:16px;
  box-shadow:var(--shadow);
  transition:transform var(--transition);
  cursor:default;
}
.topic-item:hover { transform:translateX(6px); }
.topic-num {
  width:36px; height:36px;
  border-radius:50%;
  background:var(--gl,#EDE9FE);
  color:var(--gc,#7C3AED);
  display:flex; align-items:center; justify-content:center;
  font-weight:800; font-size:.9rem;
  flex-shrink:0;
}
.topic-name { font-weight:700; font-size:.98rem; flex:1; }
.topic-diff { display:flex; gap:2px; }
.topic-diff span { font-size:.75rem; }

.topic-play-btn {
  padding:6px 14px;
  border-radius:20px;
  background:var(--gl,#EDE9FE);
  color:var(--gc,#7C3AED);
  font-size:.82rem;
  font-weight:800;
  border:2px solid transparent;
  transition:all var(--transition);
  flex-shrink:0;
}
.topic-play-btn:hover { background:var(--gc,#7C3AED); color:#fff; }
.topic-play-btn.playing {
  background:var(--gc,#7C3AED);
  color:#fff;
  animation:pulsBtn .7s ease-in-out infinite alternate;
}
@keyframes pulsBtn { from{opacity:.8} to{opacity:1} }
.topic-item.topic-active {
  border-left:4px solid var(--gc,#7C3AED);
  background:var(--gl,#EDE9FE);
}

/* ============================================================
   LERNMODULE (Physik Realschule): Video → Sim → Arbeitsblatt → Aufgaben
   ============================================================ */
.lernmodule-section { padding:0 32px 60px; max-width:900px; }
.lernmodule-intro {
  text-align:center; color:var(--text-muted);
  font-size:.98rem; line-height:1.5;
  margin:-16px auto 28px; max-width:640px;
}
.lernmodule-list { display:flex; flex-direction:column; gap:22px; }
.lm-chapter { margin-top:14px; font-size:1.15rem; }
.lm-chapter:first-child { margin-top:0; }

.lm-card {
  background:var(--surface);
  border:1px solid var(--border);
  border-top:5px solid var(--gc,#7C3AED);
  border-radius:var(--radius);
  box-shadow:var(--shadow);
  padding:22px 24px 24px;
}
.lm-card-diag {
  border-top-color:#10b981;
  border:1px solid #6ee7b7; border-top:5px solid #10b981;
  background:linear-gradient(180deg,rgba(16,185,129,.06),var(--surface) 60px);
}
.lm-card-diag .lm-num { color:#047857; background:#d1fae5; }
.lm-diag-desc { margin:2px 0 14px; color:var(--text-soft,#475569); font-size:.95rem; line-height:1.5; }

/* ── Diagnose-Karte: Ablauf-Vorschau + Start ── */
.diag-flow { display:flex; align-items:center; flex-wrap:wrap; gap:8px; margin:2px 0 16px; }
.diag-flow-step { display:inline-flex; align-items:center; gap:6px; font-weight:700; font-size:.9rem;
  color:#065f46; background:#ecfdf5; border:1px solid #a7f3d0; border-radius:999px; padding:6px 13px; }
.diag-flow-step b { font-size:1.05rem; font-weight:400; }
.diag-flow-arrow { color:#10b981; font-weight:800; }
.diag-start-btn { background:#10b981; }
.diag-start-btn:hover { background:#059669; }

/* ── Diagnose-Overlay (Predict → Observe → Explain) ── */
.diag-box { max-width:820px !important; }
.diag-steps-head { display:flex; flex-wrap:wrap; gap:8px; margin:2px 0 14px; }
.diag-step-pill { font-size:.8rem; font-weight:700; color:#94a3b8; background:#f1f5f9;
  border:1px solid #e2e8f0; border-radius:999px; padding:5px 12px; }
.diag-step-pill.active { color:#065f46; background:#d1fae5; border-color:#6ee7b7; }
.diag-step-pill.done   { color:#0f766e; background:#f0fdfa; border-color:#99f6e4; }
.diag-intro { color:#475569; line-height:1.55; margin:4px 0 12px; }
.diag-q { font-size:1.18rem; font-weight:800; color:#0f172a; margin:6px 0 4px; }
.diag-hint { color:#64748b; font-size:.92rem; margin:0 0 14px; }
.diag-chips { display:flex; flex-wrap:wrap; gap:10px; margin:6px 0 8px; }
.diag-chip { font-size:1rem; font-weight:700; color:#334155; background:#fff;
  border:2px solid #e2e8f0; border-radius:14px; padding:11px 16px; cursor:pointer; transition:.14s; }
.diag-chip:hover { border-color:#6ee7b7; }
.diag-chip.picked { color:#065f46; background:#d1fae5; border-color:#10b981;
  box-shadow:0 2px 8px rgba(16,185,129,.22); }
.diag-chip.picked::after { content:' 🧲'; }
.diag-actions { display:flex; justify-content:space-between; flex-wrap:wrap; gap:10px; margin-top:20px; }
.diag-actions .primary { margin-left:auto; }
.diag-exp-cta { text-align:center; margin:16px 0 6px; }
.diag-exp-btn { font-size:1.08rem; padding:14px 26px; }

/* ── Vergleich Vermutung ↔ Experiment ── */
.diag-table-wrap { overflow-x:auto; margin:8px 0 14px; }
.diag-table { width:100%; border-collapse:collapse; font-size:.94rem; }
.diag-table th { text-align:left; font-size:.82rem; color:#64748b; font-weight:700;
  padding:8px 10px; border-bottom:2px solid #e2e8f0; }
.diag-table td { padding:9px 10px; border-bottom:1px solid #eef2f6; vertical-align:middle; }
.diag-mat { font-weight:700; color:#0f172a; white-space:nowrap; }
.diag-guess { color:#64748b; }
.diag-real { font-weight:700; color:#0f172a; white-space:nowrap; }
.diag-verdict { font-weight:700; white-space:nowrap; }
.diag-match   .diag-verdict { color:#059669; }
.diag-surprise { background:#fffbeb; }
.diag-surprise .diag-verdict { color:#b45309; }
.diag-aha { background:#ecfdf5; border:1px solid #a7f3d0; border-radius:12px;
  padding:14px 16px; color:#065f46; line-height:1.55; margin:6px 0 12px; }
.diag-regel { background:#f8fafc; border-left:4px solid #10b981; border-radius:8px;
  padding:13px 16px; color:#334155; line-height:1.6; }

/* Forscherkreis: Themen-Umschalter (6 Magnetismus-Themen) */
.fk-topicbar { display:flex; flex-wrap:wrap; gap:8px; justify-content:center; margin:0 0 16px; }
.fk-topicchip { border:1.5px solid #cbd5e1; background:#fff; border-radius:999px; padding:7px 15px;
  font-weight:700; font-size:.85rem; color:#475569; cursor:pointer; transition:.15s; }
.fk-topicchip:hover { border-color:#38bdf8; color:#0369a1; }
.fk-topicchip.active { background:#0ea5e9; border-color:#0ea5e9; color:#fff; box-shadow:0 2px 8px rgba(14,165,233,.3); }
/* Kompetenz-Tag in der Übungsliste */
.fk-comp-tag { display:inline-block; font-family:ui-monospace,monospace; font-size:.72rem; font-weight:800;
  color:#0369a1; background:#e0f2fe; border-radius:5px; padding:1px 7px; margin-right:4px; vertical-align:middle; }
/* Generischer Vermutungs-Flow: Auswahl-Buttons + Auswertung */
.fk-optlist { display:flex; flex-direction:column; gap:9px; margin:8px 0 6px; }
.diag-optbtn { text-align:left; background:#fff; border:2px solid #e2e8f0; border-radius:13px;
  padding:13px 16px; font-size:1rem; font-weight:600; color:#334155; cursor:pointer; transition:.14s; line-height:1.4; }
.diag-optbtn:hover { border-color:#6ee7b7; }
.diag-optbtn.picked { border-color:#10b981; background:#d1fae5; color:#065f46; box-shadow:0 2px 8px rgba(16,185,129,.22); }
.fk-optresult { display:flex; flex-direction:column; gap:7px; margin:8px 0 12px; }
.fk-optrow { padding:10px 13px; border-radius:11px; background:#f8fafc; font-size:.95rem; color:#334155; line-height:1.4; }
.fk-optrow.correct { background:#ecfdf5; color:#065f46; font-weight:700; border:1px solid #a7f3d0; }
.fk-optrow.chosen-wrong { background:#fffbeb; color:#9a3412; border:1px solid #fde68a; }
@media (max-width:560px){
  .diag-flow-arrow { display:none; }
  .diag-q { font-size:1.06rem; }
}

/* ═══════════ FORSCHERKREIS (Physik-Lernzyklus) ═══════════ */
.pz-head { display:flex; justify-content:space-between; align-items:flex-end; gap:16px; flex-wrap:wrap; margin-bottom:14px; }
.pz-head-txt { flex:1 1 320px; }
.pz-toggle { display:inline-flex; background:#f1f5f9; border:1px solid #e2e8f0; border-radius:12px; padding:4px; gap:4px; }
.pz-tab { border:none; background:transparent; font-weight:700; font-size:.9rem; color:#64748b; padding:8px 14px; border-radius:9px; cursor:pointer; transition:.15s; }
.pz-tab.active { background:#fff; color:#0f172a; box-shadow:0 1px 4px rgba(0,0,0,.08); }
.fk-theme { text-align:center; color:#475569; font-size:.95rem; margin:4px 0 14px; }
.fk-theme b { color:#0f172a; }

.fk-layout { display:flex; gap:22px; align-items:flex-start; justify-content:center; flex-wrap:wrap; }
.fk-wheel { position:relative; width:min(540px,100%); aspect-ratio:1; margin:8px auto; overflow:visible; flex:0 1 540px; }
.fk-ring { position:absolute; inset:0; width:100%; height:100%; opacity:.9; }
.fk-center { position:absolute; left:50%; top:50%; transform:translate(-50%,-50%);
  width:33%; aspect-ratio:1; border-radius:50%; background:linear-gradient(160deg,#fff,#f8fafc);
  border:2px solid #e2e8f0; box-shadow:0 8px 26px rgba(15,23,42,.12); display:flex; flex-direction:column;
  align-items:center; justify-content:center; text-align:center; padding:6px; }
.fk-center-ava { font-size:2rem; line-height:1; }
.fk-center-t { font-weight:800; color:#0f172a; font-size:.9rem; margin-top:3px; }
.fk-center-s { font-size:.66rem; color:#64748b; line-height:1.3; margin-top:2px; }

.fk-node { position:absolute; transform:translate(-50%,-50%); width:96px; padding:8px 6px 9px;
  background:#fff; border:2px solid #e2e8f0; border-radius:14px; cursor:pointer; text-align:center;
  display:flex; flex-direction:column; align-items:center; gap:2px; transition:.15s; box-shadow:0 3px 10px rgba(15,23,42,.07); }
.fk-node:hover { transform:translate(-50%,-50%) scale(1.06); border-color:#94a3b8; z-index:3; }
.fk-node-badge { position:absolute; top:-9px; left:-9px; width:22px; height:22px; border-radius:50%;
  background:#94a3b8; color:#fff; font-weight:800; font-size:.75rem; display:flex; align-items:center; justify-content:center; }
.fk-node-ic { font-size:1.5rem; line-height:1; }
.fk-node-t { font-size:.68rem; font-weight:700; color:#334155; line-height:1.2; }
.fk-node.fk-done { border-color:#6ee7b7; background:#f0fdf4; }
.fk-node.fk-done .fk-node-badge { background:#10b981; }
.fk-node.fk-current { border-color:#38bdf8; box-shadow:0 4px 16px rgba(56,189,248,.35); }
.fk-node.fk-current .fk-node-badge { background:#0ea5e9; }
.fk-node.fk-heart { width:112px; border-color:#fb7185; background:linear-gradient(180deg,#fff1f2,#fff);
  box-shadow:0 6px 20px rgba(251,113,133,.3); }
.fk-node.fk-heart .fk-node-badge { background:#f43f5e; }
.fk-node.fk-heart .fk-node-ic { font-size:1.8rem; }
.fk-node.fk-heart.fk-done { border-color:#10b981; background:#f0fdf4; }

.fk-rail { flex:1 1 250px; max-width:320px; display:flex; flex-direction:column; gap:12px; }
.fk-card { background:#fff; border:1px solid #e2e8f0; border-radius:14px; padding:14px 16px; box-shadow:0 2px 8px rgba(15,23,42,.05); }
.fk-card-h { font-weight:800; color:#0f172a; font-size:.92rem; margin-bottom:8px; }
.fk-prog-head { display:flex; align-items:baseline; justify-content:space-between; gap:10px; margin-bottom:8px; }
.fk-prog-pct { font-size:1.5rem; font-weight:800; line-height:1;
  background:linear-gradient(90deg,#0ea5e9,#10b981); -webkit-background-clip:text; background-clip:text; color:transparent; }
.fk-prog { height:10px; background:#eef2f6; border-radius:99px; overflow:hidden; }
.fk-prog-fill { height:100%; background:linear-gradient(90deg,#38bdf8,#34d399); border-radius:99px; transition:width .4s; }
.fk-prog-l { font-size:.82rem; color:#64748b; margin-top:6px; font-weight:600; }
.fk-card-diag { border-color:#a7f3d0; background:linear-gradient(180deg,#ecfdf5,#fff 70px); }
.fk-diag-t { font-size:.85rem; color:#475569; line-height:1.5; margin:0 0 10px; }
.fk-next-btn { width:100%; text-align:left; background:#f8fafc; border:1px solid #e2e8f0; border-radius:11px;
  padding:10px 12px; cursor:pointer; display:flex; flex-direction:column; gap:2px; transition:.15s; }
.fk-next-btn:hover { border-color:#38bdf8; background:#f0f9ff; }
.fk-next-btn b { color:#0f172a; font-size:.9rem; }
.fk-next-btn span { color:#64748b; font-size:.78rem; line-height:1.35; }
.fk-next-done { color:#065f46; font-size:.9rem; margin:0; }

.fk-list-mobile { display:none; flex-direction:column; gap:10px; }
.fk-mrow { display:flex; align-items:center; gap:12px; text-align:left; background:#fff; border:2px solid #e2e8f0;
  border-radius:14px; padding:12px 14px; cursor:pointer; transition:.15s; position:relative; }
.fk-mrow:hover { border-color:#94a3b8; }
.fk-mrow.fk-done { border-color:#6ee7b7; background:#f0fdf4; }
.fk-mrow.fk-current { border-color:#38bdf8; }
.fk-mrow-badge { flex-shrink:0; width:28px; height:28px; border-radius:50%; background:#94a3b8; color:#fff;
  font-weight:800; display:flex; align-items:center; justify-content:center; }
.fk-mrow.fk-done .fk-mrow-badge { background:#10b981; }
.fk-mrow.fk-current .fk-mrow-badge { background:#0ea5e9; }
.fk-mrow-ic { font-size:1.5rem; flex-shrink:0; }
.fk-mrow-txt { display:flex; flex-direction:column; gap:1px; }
.fk-mrow-txt b { color:#0f172a; font-size:.95rem; }
.fk-mrow-txt small { color:#64748b; font-size:.8rem; line-height:1.35; }

.fk-legend { display:flex; gap:18px; justify-content:center; margin-top:16px; flex-wrap:wrap; }
.fk-legend span { display:inline-flex; align-items:center; gap:6px; font-size:.8rem; color:#64748b; }
.fk-dot { width:12px; height:12px; border-radius:50%; display:inline-block; border:2px solid #cbd5e1; background:#fff; }
.fk-dot.fk-done { border-color:#10b981; background:#d1fae5; }
.fk-dot.fk-current { border-color:#0ea5e9; background:#e0f2fe; }
.fk-dot.fk-todo { border-color:#cbd5e1; background:#fff; }

.fk-info-body { color:#334155; line-height:1.6; }
.fk-info-body p { margin:0 0 10px; }
.fk-quote { background:#f0f9ff; border-left:4px solid #38bdf8; border-radius:8px; padding:10px 14px; font-weight:700; color:#0f172a; }
.fk-ul { margin:0 0 10px; padding-left:20px; } .fk-ul li { margin:5px 0; }
.fk-self { display:flex; gap:12px; justify-content:center; margin:14px 0 6px; }
.fk-self-b { flex:1; max-width:120px; background:#f8fafc; border:2px solid #e2e8f0; border-radius:14px; padding:14px 8px;
  font-size:1.8rem; cursor:pointer; display:flex; flex-direction:column; align-items:center; gap:4px; transition:.15s; }
.fk-self-b:hover { border-color:#38bdf8; background:#f0f9ff; }
.fk-self-b span { font-size:.78rem; font-weight:700; color:#475569; }
.fk-self-out { min-height:20px; text-align:center; }
.fk-self-msg { background:#ecfdf5; border:1px solid #a7f3d0; border-radius:10px; padding:10px 14px; color:#065f46; margin-top:10px; }

/* Leitfrage-Banner (echtes Alltagsproblem → Forscherfrage) */
.fk-leitfrage { display:flex; align-items:center; gap:14px; background:linear-gradient(120deg,#eff6ff,#ecfeff);
  border:1px solid #bae6fd; border-radius:16px; padding:14px 18px; margin:0 0 18px; }
.fk-leitfrage-ic { font-size:1.8rem; line-height:1; flex-shrink:0; }
.fk-leitfrage-txt { flex:1; display:flex; flex-direction:column; gap:2px; min-width:0; }
.fk-leitfrage-txt span { font-size:.74rem; font-weight:800; letter-spacing:.04em; text-transform:uppercase; color:#0369a1; }
.fk-leitfrage-txt b { font-size:1.12rem; color:#0f172a; line-height:1.3; }

/* lebendiger Kreis: aktueller Schritt pulsiert, Ring dreht sich langsam */
.fk-node.fk-current { animation:fkPulse 2s ease-in-out infinite; }
@keyframes fkPulse {
  0%,100% { box-shadow:0 4px 16px rgba(56,189,248,.35); }
  50% { box-shadow:0 4px 22px rgba(56,189,248,.7); }
}
.fk-ring-c { transform-origin:50% 50%; animation:fkSpin 60s linear infinite; }
@keyframes fkSpin { to { transform:rotate(360deg); } }
@media (prefers-reduced-motion: reduce){
  .fk-node.fk-current, .fk-ring-c { animation:none; }
}

.fk-loesung { background:#ecfdf5; border:1px solid #a7f3d0; border-radius:12px; padding:12px 16px; }
.fk-mobile-hint { font-size:.85rem; color:#64748b; text-align:center; margin-bottom:4px; }

/* Lehrkraft-Hinweis (Kircher) */
.fk-teacher { margin-top:18px; background:#f8fafc; border:1px solid #e2e8f0; border-radius:12px; padding:2px 16px; }
.fk-teacher summary { cursor:pointer; font-weight:700; color:#334155; padding:12px 0; font-size:.9rem; }
.fk-teacher-body { color:#475569; line-height:1.55; font-size:.88rem; padding:0 0 14px; }
.fk-teacher-body .fk-ul { margin-top:8px; }

/* Nur auf schmalen Handys zur Liste wechseln – sonst bleibt der Kreis */
@media (max-width:560px){
  .fk-layout { display:none; }
  .fk-list-mobile { display:flex; }
}

/* ── Diagnose-Modus IN der Magnet-Simulation (Vermutungs-Spalte) ── */
.msf-guess { color:#64748b; font-size:.9rem; }
.msf-ok { color:#059669; font-weight:800; }
.msf-sp { color:#b45309; font-weight:800; }
tr.msf-diag-surprise { background:#fffbeb; }
.msf-diag-eval { margin-top:12px; }
.msf-diag-done { background:#ecfdf5; border:1px solid #a7f3d0; border-radius:10px;
  padding:11px 14px; color:#065f46; line-height:1.5; }
.msf-diag-progress { background:#f1f5f9; border:1px dashed #cbd5e1; border-radius:10px;
  padding:10px 14px; color:#475569; font-size:.92rem; }
.lm-card-head { display:flex; align-items:baseline; gap:12px; flex-wrap:wrap; margin-bottom:14px; }
.lm-num {
  flex-shrink:0;
  font-size:.72rem; font-weight:800; letter-spacing:.06em; text-transform:uppercase;
  color:var(--gc,#7C3AED); background:var(--gl,#EDE9FE);
  padding:5px 12px; border-radius:20px;
}
.lm-title {
  flex:1 1 240px; min-width:0;
  margin:0;
  font-family:var(--font-head); font-size:1.25rem; font-weight:800; line-height:1.25;
  word-break:break-word; overflow-wrap:anywhere;
}

.lm-progress { display:flex; align-items:center; gap:12px; margin-bottom:18px; }
.lm-progress-track { flex:1; height:8px; background:var(--border); border-radius:8px; overflow:hidden; }
.lm-progress-fill {
  display:block; height:100%; border-radius:8px;
  background:linear-gradient(90deg,var(--gc,#7C3AED),var(--gc2,#A855F7));
  transition:width .4s cubic-bezier(.4,0,.2,1);
}
.lm-progress-label { flex-shrink:0; font-size:.8rem; font-weight:700; color:var(--text-muted); white-space:nowrap; }

.lm-steps { list-style:none; margin:0; padding:0; display:flex; flex-direction:column; gap:12px; }
.lm-step {
  display:flex; gap:16px; padding:16px;
  border-radius:var(--radius-sm);
  background:var(--bg); border:1px solid var(--border);
  transition:border-color var(--transition), background var(--transition);
}
.lm-step-rail { flex-shrink:0; }
.lm-step-emoji {
  width:46px; height:46px; border-radius:50%;
  display:flex; align-items:center; justify-content:center;
  font-size:1.4rem; background:var(--surface); border:2px solid var(--border);
}
.lm-step-main { flex:1; min-width:0; }
.lm-step-top { display:flex; align-items:center; gap:10px; margin-bottom:4px; flex-wrap:wrap; }
.lm-step-label { font-weight:800; font-size:1rem; }
.lm-step-badge {
  font-size:.68rem; font-weight:800; text-transform:uppercase; letter-spacing:.04em;
  padding:3px 9px; border-radius:20px;
  background:var(--border); color:var(--text-muted);
}
.lm-step-desc { font-size:.9rem; color:var(--text-muted); line-height:1.5; margin:0 0 12px; }
.lm-step-btn {
  display:inline-flex; align-items:center; gap:9px;
  min-height:46px; padding:11px 20px;
  border-radius:12px; border:none; cursor:pointer;
  font-family:var(--font-main); font-weight:800; font-size:.95rem;
  background:var(--gc,#7C3AED); color:#fff;
  transition:transform var(--transition), box-shadow var(--transition), background var(--transition), color var(--transition);
}
.lm-step-btn:hover { transform:translateY(-2px); box-shadow:var(--shadow); }
.lm-step-btn:focus-visible { outline:3px solid var(--gc,#7C3AED); outline-offset:2px; }
.lm-step-btn-ico { font-size:1.05rem; }
.lm-step-locked {
  display:inline-flex; align-items:center; gap:8px;
  font-size:.86rem; font-weight:700; font-style:italic; color:var(--text-muted);
}

/* Zustände: noch nicht begonnen / in Bearbeitung / abgeschlossen */
.lm-step.lm-todo .lm-step-btn { background:var(--gl,#EDE9FE); color:var(--gc,#7C3AED); }
.lm-step.lm-todo .lm-step-btn:hover { background:var(--gc,#7C3AED); color:#fff; }
.lm-step.lm-current { background:var(--gl,#EDE9FE); border-color:var(--gc,#7C3AED); box-shadow:inset 0 0 0 1px var(--gc,#7C3AED); }
.lm-step.lm-current .lm-step-emoji { border-color:var(--gc,#7C3AED); }
.lm-step.lm-current .lm-step-badge { background:var(--gc,#7C3AED); color:#fff; }
.lm-step.lm-done { background:#ecfdf5; border-color:#a7f3d0; }
.lm-step.lm-done .lm-step-emoji { border-color:#10B981; background:#d1fae5; }
.lm-step.lm-done .lm-step-badge { background:#d1fae5; color:#047857; }
.lm-step.lm-done .lm-step-btn { background:#10B981; color:#fff; }
.lm-step.lm-unavail { opacity:.72; }
.lm-step.lm-unavail .lm-step-emoji { opacity:.5; }

/* Responsiv: Tablet & Smartphone */
@media (max-width:768px){
  .lernmodule-section { padding:0 18px 48px; }
}
@media (max-width:600px){
  .lernmodule-section { padding:0 14px 44px; }
  .lm-card { padding:18px 16px 20px; border-radius:14px; }
  .lm-title { font-size:1.12rem; }
  .lm-step { padding:13px; gap:12px; }
  .lm-step-emoji { width:40px; height:40px; font-size:1.2rem; }
  .lm-step-btn { width:100%; justify-content:center; }
  .lm-progress { flex-wrap:wrap; gap:8px; }
  .lm-progress-label { font-size:.75rem; }
}

/* ============================================================
   EXERCISES SECTION
   ============================================================ */
.exercises-section { padding:0 32px 60px; max-width:900px; }
.exercise-filter { display:flex; gap:10px; margin-bottom:24px; flex-wrap:wrap; }
.filter-btn {
  padding:8px 18px;
  border-radius:30px;
  border:2px solid var(--border);
  font-weight:700;
  font-size:.85rem;
  transition:all var(--transition);
}
.filter-btn:hover { border-color:var(--gc,#7C3AED); color:var(--gc,#7C3AED); }
.filter-btn.active { background:var(--gc,#7C3AED); border-color:var(--gc,#7C3AED); color:#fff; }

/* ── KI-Aufgaben-Leiste ── */
.ai-exercise-bar {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 24px;
  padding: 16px 20px;
  background: linear-gradient(135deg, #f5f3ff 0%, #ede9fe 100%);
  border-radius: 16px;
  border: 2px solid rgba(124,58,237,.18);
  box-shadow: 0 2px 12px rgba(124,58,237,.08);
}
.btn-ai-exercise {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 11px 22px;
  background: linear-gradient(135deg, #7C3AED, #A855F7);
  color: #fff;
  border: none;
  border-radius: 12px;
  font-size: .95rem;
  font-weight: 800;
  font-family: inherit;
  cursor: pointer;
  white-space: nowrap;
  flex-shrink: 0;
  box-shadow: 0 4px 14px rgba(124,58,237,.3);
  transition: all .2s;
}
.btn-ai-exercise:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: 0 7px 22px rgba(124,58,237,.42);
}
.btn-ai-exercise:disabled { opacity: .55; cursor: not-allowed; }
.ai-ex-bar-hint {
  font-size: .85rem;
  color: #5b21b6;
  font-weight: 600;
  line-height: 1.4;
  opacity: .85;
}
@media (max-width: 520px) {
  .ai-exercise-bar { flex-direction: column; align-items: flex-start; gap: 10px; }
}

.exercises-list { display:flex; flex-direction:column; gap:16px; }
.exercise-item {
  background:var(--surface);
  border-radius:var(--radius);
  padding:24px;
  box-shadow:var(--shadow);
  border-left:4px solid var(--gc,#7C3AED);
  transition:transform var(--transition), box-shadow var(--transition);
}
.exercise-item.done { border-left-color:#10B981; }
.exercise-item:hover { transform:translateX(4px); box-shadow:var(--shadow-lg); }
.exercise-top { display:flex; align-items:center; gap:12px; margin-bottom:12px; flex-wrap:wrap; }
.exercise-type { font-size:.75rem; font-weight:700; padding:4px 10px; border-radius:20px; background:var(--gl,#EDE9FE); color:var(--gc,#7C3AED); }
.exercise-diff-stars { color:#FBBF24; font-size:.85rem; }
.exercise-done-badge { margin-left:auto; font-size:.8rem; color:#10B981; font-weight:700; }
.exercise-title { font-size:1rem; font-weight:800; margin-bottom:8px; }
.exercise-desc { font-size:.88rem; color:var(--text-muted); line-height:1.5; margin-bottom:16px; }
.btn-start-exercise {
  padding:10px 24px;
  background:var(--gc,#7C3AED);
  color:#fff;
  border-radius:30px;
  font-weight:800;
  font-size:.88rem;
  transition:transform var(--transition), opacity var(--transition);
}
.btn-start-exercise:hover { transform:scale(1.03); opacity:.9; }

/* ============================================================
   QUIZ
   ============================================================ */
.quiz-container {
  max-width:700px;
  margin:0 auto;
  padding:40px 24px 60px;
}
.quiz-header { margin-bottom:32px; }
.quiz-meta { font-size:.85rem; font-weight:700; color:var(--text-muted); margin-bottom:12px; }
.quiz-progress-wrap { height:8px; background:var(--border); border-radius:8px; overflow:hidden; margin-bottom:8px; }
.quiz-progress-fill { height:100%; background:linear-gradient(90deg,var(--gc,#7C3AED),#06B6D4); border-radius:8px; transition:width .4s; }
.quiz-counter { font-size:.82rem; color:var(--text-muted); font-weight:700; }

.quiz-card {
  background:var(--surface);
  border-radius:var(--radius);
  padding:32px;
  box-shadow:var(--shadow-lg);
}
.quiz-question {
  font-size:1.18rem;
  font-weight:800;
  line-height:1.5;
  margin-bottom:8px;
}
.quiz-hint-wrap { margin-bottom:20px; }
.hint-toggle-btn {
  display:inline-flex; align-items:center; gap:6px;
  padding:7px 16px;
  background:rgba(124,58,237,.08);
  border:1.5px dashed var(--gc,#7C3AED);
  border-radius:20px;
  font-size:.82rem; font-weight:700;
  color:var(--gc,#7C3AED);
  cursor:pointer; transition:background .2s;
}
.hint-toggle-btn:hover { background:rgba(124,58,237,.15); }
.hint-toggle-btn.shown { background:var(--gl,#EDE9FE); }
.quiz-hint {
  margin-top:10px;
  padding:12px 16px;
  background:var(--gl,#EDE9FE);
  border-left:4px solid var(--gc,#7C3AED);
  border-radius:0 10px 10px 0;
  font-size:.88rem;
  color:var(--gc,#7C3AED);
  font-weight:600;
  line-height:1.5;
}
.quiz-options { display:flex; flex-direction:column; gap:12px; margin-bottom:24px; }
.quiz-option {
  padding:14px 20px;
  border-radius:var(--radius-sm);
  border:2px solid var(--border);
  font-size:.98rem;
  font-weight:600;
  text-align:left;
  transition:all var(--transition);
  cursor:pointer;
}
.quiz-option:hover:not(:disabled) { border-color:var(--gc,#7C3AED); background:var(--gl,#EDE9FE); }
.quiz-option.selected { border-color:var(--gc,#7C3AED); background:var(--gl,#EDE9FE); }
.quiz-option.correct { border-color:#10B981; background:#D1FAE5; color:#065F46; }
.quiz-option.wrong { border-color:#EF4444; background:#FEE2E2; color:#991B1B; }
.quiz-option:disabled { cursor:default; }

.quiz-feedback {
  padding:16px 20px;
  border-radius:var(--radius-sm);
  font-weight:700;
  font-size:.95rem;
  line-height:1.5;
  margin-bottom:20px;
}
.quiz-feedback.correct-fb { background:#D1FAE5; color:#065F46; border:1px solid #6EE7B7; }
.quiz-feedback.wrong-fb { background:#FEE2E2; color:#991B1B; border:1px solid #FCA5A5; }
.quiz-feedback.hidden { display:none; }

.quiz-actions { display:flex; gap:12px; flex-wrap:wrap; }
.btn-primary {
  padding:12px 28px;
  background:linear-gradient(135deg,var(--gc,#7C3AED),var(--gc2,#A855F7));
  color:#fff;
  border-radius:30px;
  font-weight:800;
  font-size:.95rem;
  transition:transform var(--transition), box-shadow var(--transition);
  box-shadow:0 4px 14px rgba(124,58,237,.3);
}
.btn-primary:hover { transform:translateY(-2px); box-shadow:0 6px 20px rgba(124,58,237,.4); }
.btn-primary.hidden, .btn-secondary.hidden { display:none; }
.btn-secondary {
  padding:12px 24px;
  border:2px solid var(--border);
  border-radius:30px;
  font-weight:700;
  font-size:.92rem;
  transition:all var(--transition);
}
.btn-secondary:hover { border-color:var(--gc,#7C3AED); color:var(--gc,#7C3AED); }

/* ============================================================
   RESULT VIEW
   ============================================================ */
.result-container {
  max-width:600px;
  margin:0 auto;
  padding:60px 24px;
  text-align:center;
}
.result-emoji { font-size:4rem; margin-bottom:16px; animation:bounceIn .6s; }
@keyframes bounceIn { 0%{transform:scale(0)} 60%{transform:scale(1.2)} 100%{transform:scale(1)} }
.result-title { font-size:2rem; font-weight:900; margin-bottom:12px; }
.result-sub { color:var(--text-muted); font-size:1.05rem; line-height:1.5; margin-bottom:40px; }

.score-ring { position:relative; width:160px; height:160px; margin:0 auto 32px; }
.score-ring svg { width:100%; height:100%; }
.score-text {
  position:absolute;
  inset:0;
  display:flex;
  flex-direction:column;
  align-items:center;
  justify-content:center;
  font-weight:900;
}
.score-text .score-big { font-size:2.2rem; line-height:1; }
.score-text .score-small { font-size:.8rem; color:var(--text-muted); }

.result-badges { display:flex; gap:12px; justify-content:center; flex-wrap:wrap; margin-bottom:40px; }
.result-badge {
  padding:8px 18px;
  border-radius:30px;
  font-weight:800;
  font-size:.88rem;
  display:flex;
  align-items:center;
  gap:6px;
  animation:fadeInUp .5s both;
}
@keyframes fadeInUp { from{opacity:0;transform:translateY(12px)} to{opacity:1;transform:translateY(0)} }
.result-badge.gold { background:#FEF3C7; color:#92400E; border:2px solid #FCD34D; }
.result-badge.silver { background:#F3F4F6; color:#374151; border:2px solid #9CA3AF; }
.result-badge.bronze { background:#FEF9EE; color:#92400E; border:2px solid #D97706; }

.result-actions { display:flex; gap:12px; flex-wrap:wrap; justify-content:center; }

/* ============================================================
   UTILITIES
   ============================================================ */
.mt-auto { margin-top:auto; }

/* Responsive */
@media (max-width: 640px) {
  .grade-grid { grid-template-columns:1fr; padding:0 16px 32px; }
  .subject-grid { grid-template-columns:1fr; padding:0 16px 32px; }
  .hero { padding:60px 20px 48px; }
  .hero-stats { gap:24px; }
  .video-section, .topics-section, .exercises-section { padding-left:16px; padding-right:16px; }
  .quiz-container { padding:24px 16px 40px; }
  .quiz-card { padding:24px 16px; }
  .grade-hero, .subject-hero { padding:32px 20px; }
  .features-section { padding:40px 16px; }
  .topnav-inner { padding:0 16px; }

  /* Video studio — stack vertically on mobile */
  .video-studio { padding:20px 16px 18px; }
  .studio-main { flex-direction:column; align-items:center; gap:16px; }
  .mascot-wrap { flex-shrink:0; }
  .avatar-frame { width:120px; height:120px; }
  .mascot-svg { width:80px; height:119px; }
  .studio-right { width:100%; }
  .studio-bubble { font-size:.88rem; padding:14px 16px; }
  .studio-controls-top { flex-direction:column; gap:8px; align-items:flex-start; }
  .playback-row { flex-wrap:wrap; gap:8px; }
  .btn-play { font-size:.85rem; padding:9px 18px; }
}

/* Animations for view transitions */
.view-enter { animation: viewIn .3s ease both; }
@keyframes viewIn { from{opacity:0;transform:translateY(16px)} to{opacity:1;transform:translateY(0)} }

/* ============================================================
   VIDEO ILLUSTRATION PANEL
   ============================================================ */
.video-illustration {
  background: rgba(255,255,255,.07);
  border: 1px solid rgba(255,255,255,.18);
  border-radius: var(--radius-sm);
  padding: 14px 18px;
  margin: 0 0 22px;
  animation: visSlide .35s ease;
  text-align: center;
  min-height: 100px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 8px;
}
.video-illustration.hidden { display: none; }

@keyframes visSlide {
  from { opacity:0; transform:translateY(-8px); }
  to   { opacity:1; transform:translateY(0); }
}

.vis-main {
  font-size: 1.45rem;
  font-weight: 900;
  color: #fff;
  line-height: 1.45;
  text-align: center;
}
.vis-sub {
  font-size: .84rem;
  color: rgba(255,255,255,.6);
  text-align: center;
  line-height: 1.4;
}
.vis-hl  { color: #FBBF24; }
.vis-hl2 { color: #34D399; }

.vis-frac {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  vertical-align: middle;
  line-height: 1.1;
  margin: 0 4px;
}
.vis-frac span:first-child {
  border-bottom: 2px solid currentColor;
  padding-bottom: 1px;
  margin-bottom: 1px;
}
.vis-frac span { font-size: 1rem; display: block; }

/* ============================================================
   RESULT REVIEW – wrong answer breakdown
   ============================================================ */
.result-review {
  width: 100%;
  max-width: 560px;
  margin: 0 auto 36px;
  text-align: left;
}
.review-perfect {
  background: linear-gradient(135deg, #D1FAE5, #A7F3D0);
  color: #065F46;
  padding: 20px 24px;
  border-radius: var(--radius-sm);
  font-weight: 800;
  font-size: 1.1rem;
  text-align: center;
  border: 2px solid #6EE7B7;
}
.review-title {
  font-size: 1.05rem;
  font-weight: 800;
  color: var(--text);
  font-family: var(--font-head);
  margin-bottom: 14px;
}
.review-summary {
  display: flex;
  gap: 12px;
  margin-bottom: 20px;
}
.review-stat {
  flex: 1;
  padding: 14px 10px;
  border-radius: var(--radius-sm);
  text-align: center;
}
.review-stat-icon { font-size: 1.4rem; display: block; margin-bottom: 4px; }
.review-stat-val  { font-size: 1.5rem; font-weight: 900; display: block; line-height: 1; }
.review-stat-lbl  { font-size: .75rem; opacity: .7; display: block; margin-top: 3px; }
.correct-stat { background: #D1FAE5; color: #065F46; border: 2px solid #6EE7B7; }
.wrong-stat   { background: #FEE2E2; color: #991B1B; border: 2px solid #FCA5A5; }

.review-mistakes-title {
  font-size: .82rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: .08em;
  color: var(--text-muted);
  margin: 0 0 12px;
}
.review-item {
  background: var(--surface);
  border-radius: var(--radius-sm);
  padding: 16px 18px;
  margin-bottom: 12px;
  border-left: 4px solid #EF4444;
  box-shadow: var(--shadow);
  animation: fadeInUp .4s both;
}
.review-q-num {
  font-size: .72rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: .08em;
  color: #EF4444;
  margin-bottom: 5px;
}
.review-question {
  font-weight: 700;
  font-size: .95rem;
  margin-bottom: 10px;
  color: var(--text);
  line-height: 1.4;
}
.review-answers {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-bottom: 10px;
  font-size: .85rem;
}
.review-your    { color: #991B1B; }
.review-your  span { font-weight: 700; }
.review-correct { color: #065F46; }
.review-correct span { font-weight: 700; }
.review-explanation {
  font-size: .83rem;
  color: #4F46E5;
  background: #EEF2FF;
  padding: 8px 12px;
  border-radius: 8px;
  line-height: 1.55;
}

/* ============================================================
   CHAT WIDGET
   ============================================================ */
.chat-fab {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 1100;
  width: 58px;
  height: 58px;
  border-radius: 50%;
  border: none;
  background: linear-gradient(135deg, #7C3AED, #4F46E5);
  color: #fff;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 20px rgba(124,58,237,.45);
  transition: transform .18s, box-shadow .18s;
}
.chat-fab:hover { transform: scale(1.09); box-shadow: 0 6px 28px rgba(124,58,237,.55); }
.chat-fab-badge {
  position: absolute;
  top: 4px; right: 4px;
  width: 20px; height: 20px;
  border-radius: 50%;
  background: #F59E0B;
  color: #1e1e2e;
  font-size: .68rem;
  font-weight: 800;
  display: flex; align-items: center; justify-content: center;
  box-shadow: 0 1px 4px rgba(0,0,0,.25);
  pointer-events: none;
}

.chat-panel {
  position: fixed;
  bottom: 92px;
  right: 24px;
  z-index: 1099;
  width: 360px;
  max-width: calc(100vw - 32px);
  height: 480px;
  max-height: calc(100dvh - 120px);
  background: #fff;
  border-radius: 20px;
  box-shadow: 0 12px 50px rgba(0,0,0,.18);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  transform: scale(.85) translateY(20px);
  opacity: 0;
  pointer-events: none;
  transition: transform .22s cubic-bezier(.34,1.56,.64,1), opacity .18s;
}
.chat-panel.open {
  transform: scale(1) translateY(0);
  opacity: 1;
  pointer-events: all;
}

.chat-panel-header {
  padding: 14px 16px;
  background: linear-gradient(135deg, #7C3AED, #4F46E5);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-shrink: 0;
}
.chat-panel-title { display: flex; align-items: center; gap: 10px; }
.chat-panel-avatar-icon {
  width: 38px; height: 38px;
  border-radius: 50%;
  background: rgba(255,255,255,.2);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.3rem;
}
.chat-panel-title strong { display: block; font-size: .98rem; line-height: 1.2; }
.chat-panel-sub { font-size: .72rem; opacity: .82; }
.chat-panel-close {
  background: rgba(255,255,255,.15);
  border: none; color: #fff;
  width: 28px; height: 28px;
  border-radius: 50%;
  cursor: pointer; font-size: .9rem;
  display: flex; align-items: center; justify-content: center;
  transition: background .15s;
}
.chat-panel-close:hover { background: rgba(255,255,255,.3); }

.chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: 14px 14px 6px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  scroll-behavior: smooth;
}
.chat-messages::-webkit-scrollbar { width: 4px; }
.chat-messages::-webkit-scrollbar-thumb { background: #e0e0e0; border-radius: 4px; }

.chat-bubble {
  max-width: 85%;
  padding: 10px 14px;
  border-radius: 16px;
  font-size: .88rem;
  line-height: 1.55;
  word-break: break-word;
  animation: bubbleIn .2s ease;
}
@keyframes bubbleIn { from { opacity:0; transform:translateY(6px); } to { opacity:1; transform:none; } }

.chat-bubble-bot {
  background: #F3F4F6;
  color: #1f2937;
  border-bottom-left-radius: 4px;
  align-self: flex-start;
}

/* Markdown-Formatierung in Chat-Bubbles klein halten */
.chat-bubble-bot h1,
.chat-bubble-bot h2,
.chat-bubble-bot h3 {
  font-size: 1rem !important;
  font-weight: 700;
  margin: 8px 0 4px;
  line-height: 1.4;
}
.chat-bubble-bot h4,
.chat-bubble-bot h5 {
  font-size: .95rem !important;
  font-weight: 700;
  margin: 6px 0 2px;
}
.chat-bubble-bot p  { margin: 4px 0; }
.chat-bubble-bot ul,
.chat-bubble-bot ol { padding-left: 18px; margin: 4px 0; }
.chat-bubble-bot li { margin: 2px 0; }
.chat-bubble-bot strong { font-weight: 700; }
.chat-bubble-bot code {
  background: #e5e7eb;
  border-radius: 4px;
  padding: 1px 5px;
  font-size: .85rem;
  font-family: monospace;
}
.chat-bubble-bot hr { border: none; border-top: 1px solid #d1d5db; margin: 8px 0; }
.chat-bubble-user {
  background: linear-gradient(135deg, #7C3AED, #4F46E5);
  color: #fff;
  border-bottom-right-radius: 4px;
  align-self: flex-end;
}
.chat-bubble-error {
  background: #FEF2F2;
  color: #991B1B;
  border: 1px solid #FECACA;
  align-self: flex-start;
}

.chat-typing {
  display: flex; align-items: center; gap: 4px;
  padding: 10px 14px;
  background: #F3F4F6;
  border-radius: 16px;
  border-bottom-left-radius: 4px;
  align-self: flex-start;
  max-width: 70px;
}
.chat-typing span {
  width: 7px; height: 7px;
  background: #9CA3AF;
  border-radius: 50%;
  animation: typingDot 1.1s infinite;
}
.chat-typing span:nth-child(2) { animation-delay: .18s; }
.chat-typing span:nth-child(3) { animation-delay: .36s; }
@keyframes typingDot {
  0%,80%,100% { transform:translateY(0); opacity:.5; }
  40% { transform:translateY(-5px); opacity:1; }
}

.chat-input-row {
  display: flex;
  gap: 8px;
  padding: 10px 12px;
  border-top: 1px solid #F3F4F6;
  background: #fff;
  flex-shrink: 0;
}
.chat-input {
  flex: 1;
  border: 1.5px solid #E5E7EB;
  border-radius: 22px;
  padding: 9px 14px;
  font-size: .88rem;
  font-family: var(--font-body, 'Nunito', sans-serif);
  outline: none;
  background: #F9FAFB;
  transition: border-color .15s;
}
.chat-input:focus { border-color: #7C3AED; background: #fff; }
.chat-img-btn {
  width: 38px; height: 38px;
  border-radius: 50%;
  border: 1.5px solid #E5E7EB;
  background: #F9FAFB;
  color: #6B7280;
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
  transition: all .15s;
}
.chat-img-btn:hover { background: #EEF2FF; color: #7C3AED; border-color: #7C3AED; }
.chat-img-btn.has-img { background: #EEF2FF; color: #7C3AED; border-color: #7C3AED; }

.chat-img-preview {
  margin: 0 12px 6px;
  position: relative;
  display: inline-block;
}
.chat-img-preview img {
  max-height: 100px;
  max-width: 100%;
  border-radius: 10px;
  border: 2px solid #7C3AED;
  display: block;
}
.chat-img-remove {
  position: absolute;
  top: -6px; right: -6px;
  width: 20px; height: 20px;
  border-radius: 50%;
  border: none;
  background: #EF4444;
  color: #fff;
  font-size: .65rem;
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  line-height: 1;
}

.chat-mic-btn {
  width: 38px; height: 38px;
  border-radius: 50%;
  border: 1.5px solid #E5E7EB;
  background: #F9FAFB;
  color: #6B7280;
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
  transition: all .15s;
}
.chat-mic-btn:hover { background: #EEF2FF; color: #7C3AED; border-color: #7C3AED; }
.chat-mic-btn.recording {
  background: #FEF2F2;
  border-color: #EF4444;
  color: #EF4444;
  animation: micPulse 1s infinite;
}
@keyframes micPulse {
  0%,100% { box-shadow: 0 0 0 0 rgba(239,68,68,.4); }
  50%      { box-shadow: 0 0 0 7px rgba(239,68,68,0); }
}

.chat-send-btn {
  width: 40px; height: 40px;
  border-radius: 50%;
  border: none;
  background: linear-gradient(135deg, #7C3AED, #4F46E5);
  color: #fff;
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
  transition: transform .15s, opacity .15s;
}
.chat-send-btn:hover { transform: scale(1.08); }
.chat-send-btn:disabled { opacity: .45; cursor: not-allowed; transform: none; }

.chat-overlay {
  position: fixed; inset: 0;
  z-index: 1098;
  display: none;
}
.chat-overlay.visible { display: block; }

@media (max-width: 480px) {
  .chat-fab { bottom: 16px; right: 16px; }
  .chat-panel { bottom: 80px; right: 8px; width: calc(100vw - 16px); height: 420px; }
}

/* ══════════════════════════════════════════════════════════════════
   EXPLAINER PLAYER  —  Presenter-Style
   ══════════════════════════════════════════════════════════════════ */
#explainerModal {
  position: fixed; inset: 0; z-index: 2200;
  display: flex; align-items: center; justify-content: center;
  opacity: 0; pointer-events: none;
  transition: opacity .4s ease;
  background: rgba(0,0,0,.78);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
}
#explainerModal.visible { opacity: 1; pointer-events: all; }

/* ─── Card ───────────────────────────────────────── */
.xp-card {
  width: min(660px, 95vw);
  background: linear-gradient(160deg, #130B2E 0%, #0F1E5A 60%, #130B2E 100%);
  border-radius: 28px;
  overflow: hidden;
  position: relative;
  box-shadow: 0 32px 96px rgba(0,0,0,.72),
              0 0 0 1px rgba(167,139,250,.15),
              inset 0 1px 0 rgba(255,255,255,.07);
  transform: scale(.92) translateY(24px);
  transition: transform .4s cubic-bezier(.34,1.4,.64,1);
}
#explainerModal.visible .xp-card { transform: scale(1) translateY(0); }

/* glow orb */
.xp-card::before {
  content: ''; position: absolute; pointer-events: none;
  width: 380px; height: 380px; border-radius: 50%;
  background: radial-gradient(circle, rgba(124,58,237,.22), transparent 70%);
  top: -150px; right: -110px;
  animation: xpOrb 9s ease-in-out infinite;
}
@keyframes xpOrb {
  0%,100% { transform: translate(0,0); }
  40%     { transform: translate(-22px,18px); }
  70%     { transform: translate(14px,-20px); }
}

/* close btn */
.xp-close {
  position: absolute; top: 14px; right: 14px; z-index: 20;
  width: 34px; height: 34px; border-radius: 50%;
  background: rgba(255,255,255,.1); border: 1px solid rgba(255,255,255,.12);
  color: rgba(255,255,255,.7); font-size: 16px; cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  transition: background .2s, transform .15s;
}
.xp-close:hover { background: rgba(255,255,255,.22); transform: scale(1.1); }

/* ─── Header ───────────────────────────────────── */
.xp-header {
  display: flex; flex-direction: column; align-items: center;
  gap: 8px; padding: 36px 32px 20px;
}
.xp-hbadge {
  background: rgba(124,58,237,.28); border: 1px solid rgba(167,139,250,.4);
  border-radius: 20px; padding: 4px 16px;
  font-size: .74rem; font-weight: 700; letter-spacing: .08em;
  color: #c4b5fd; text-transform: uppercase;
  animation: xpFadeUp .4s ease both .1s;
}
.xp-hemoji {
  font-size: 50px; line-height: 1;
  animation: xpPopBounce .65s cubic-bezier(.34,1.56,.64,1) both .15s;
}
@keyframes xpPopBounce {
  from { transform: scale(0) rotate(-20deg); opacity: 0; }
  to   { transform: scale(1) rotate(0); opacity: 1; }
}
.xp-htitle {
  font-size: 1.6rem; font-weight: 900; color: #fff;
  text-align: center; line-height: 1.2;
  animation: xpFadeUp .5s ease both .25s;
}

/* ─── Text stage ────────────────────────────────── */
.xp-stage {
  margin: 0 24px;
  background: rgba(0,0,0,.22);
  border-radius: 18px;
  border: 1px solid rgba(167,139,250,.12);
  padding: 22px 24px;
  min-height: 116px;
  display: flex; flex-direction: column; gap: 14px;
  position: relative; z-index: 1;
}
.xp-s1, .xp-s2 {
  opacity: 0; transform: translateY(12px);
  transition: opacity .55s ease, transform .55s ease;
  line-height: 1.65;
}
.xp-s1 { font-size: 1.08rem; font-weight: 700; color: #fff; }
.xp-s2 {
  font-size: .98rem; font-weight: 500; color: rgba(255,255,255,.78);
  padding-top: 12px;
  border-top: 1px solid rgba(167,139,250,.18);
}
.xs-visible { opacity: 1 !important; transform: translateY(0) !important; }

/* ─── Bottom row ────────────────────────────────── */
.xp-bottom {
  display: flex; align-items: flex-end; gap: 16px;
  padding: 18px 24px 26px;
}

/* ─── Teacher avatar ─────────────────────────────── */
.xpt-wrap {
  flex-shrink: 0;
  width: 92px; height: 144px;
  animation: xpEntry .65s cubic-bezier(.34,1.4,.64,1) both .3s;
}
@keyframes xpEntry {
  from { transform: translateY(28px) scale(.82); opacity: 0; }
  to   { transform: translateY(0) scale(1); opacity: 1; }
}
.xpt-svg {
  width: 100%; height: 100%;
  filter: drop-shadow(0 8px 22px rgba(124,58,237,.45));
  animation: xpBob 3s ease-in-out infinite;
}
@keyframes xpBob {
  0%,100% { transform: translateY(0); }
  50%     { transform: translateY(-6px); }
}

/* eyelid blink */
.xpt-lid {
  transform-box: fill-box;
  transform-origin: center top;
  transform: scaleY(0);
  animation: xpBlink 5s ease-in-out infinite;
}
.xpt-lid-r { animation-delay: .05s; }
@keyframes xpBlink {
  0%, 87%, 95%, 100% { transform: scaleY(0); }
  91% { transform: scaleY(1.1); }
}

/* talking mouth states */
.xpt-svg.talking #xptMouthSmile { opacity: 0; }
.xpt-svg.talking #xptMouthTalk {
  opacity: 1;
  transform-box: fill-box;
  transform-origin: center center;
  animation: xpTalk .22s ease-in-out infinite;
}
.xpt-svg.talking #xptTeeth { opacity: 1; }
@keyframes xpTalk {
  0%,100% { transform: scaleY(0.45); }
  50%     { transform: scaleY(1.9); }
}

/* ─── Controls ──────────────────────────────────── */
.xp-controls {
  flex: 1; display: flex; flex-direction: column; gap: 12px;
  padding-bottom: 4px;
}
.xp-prog-track {
  height: 4px; background: rgba(255,255,255,.1);
  border-radius: 2px; overflow: hidden;
}
.xp-prog-fill {
  height: 100%; width: 0%;
  background: linear-gradient(90deg, #7C3AED, #A855F7, #38BDF8);
  border-radius: 2px; transition: width .12s linear;
}
.xp-btns { display: flex; align-items: center; gap: 10px; }
.xp-ctrl {
  width: 40px; height: 40px; border-radius: 50%;
  background: rgba(255,255,255,.1); border: 1px solid rgba(255,255,255,.12);
  color: white; font-size: 16px; cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  transition: background .2s, transform .15s;
}
.xp-ctrl:hover { background: rgba(255,255,255,.22); transform: scale(1.12); }

/* ─── Keyframes ─────────────────────────────────── */
@keyframes xpFadeUp {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ─── Hook ──────────────────────────────────────────── */
.xp-hook {
  position: absolute; inset: 0; z-index: 2;
  display: flex; align-items: center; justify-content: center;
  text-align: center; padding: 12px 16px;
  font-size: 1.45rem; font-weight: 900; line-height: 1.3;
  background: linear-gradient(135deg, #c084fc 0%, #38BDF8 50%, #f472b6 100%);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
  opacity: 0; transform: scale(.86);
  transition: opacity .42s ease, transform .45s cubic-bezier(.34,1.4,.64,1);
  pointer-events: none;
}
.xp-hook.xhvis { opacity: 1; transform: scale(1); }
.xp-hook.xhout {
  opacity: 0; transform: scale(1.08);
  transition: opacity .28s ease, transform .28s ease;
}

/* ─── Word-by-word reveal ───────────────────────────── */
.xp-w {
  display: inline-block;
  opacity: 0; transform: translateY(9px);
}
.xs-visible .xp-w {
  animation: xpWordIn .38s ease calc(var(--wi) * 100ms) both;
}
@keyframes xpWordIn {
  to { opacity: 1; transform: translateY(0); }
}

/* keyword glow */
.xp-kw {
  background: linear-gradient(135deg, #a78bfa, #38BDF8);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
  font-weight: 800;
}

/* ─── Timeline + timer ──────────────────────────────── */
.xp-timeline {
  display: flex; align-items: center; gap: 10px;
}
.xp-timer {
  font-size: .7rem; color: rgba(255,255,255,.38);
  font-variant-numeric: tabular-nums; font-weight: 600;
  white-space: nowrap; flex-shrink: 0; letter-spacing: .01em;
}

@media (max-width: 480px) {
  .xp-card { border-radius: 22px; }
  .xp-header { padding: 28px 20px 16px; }
  .xp-htitle { font-size: 1.35rem; }
  .xp-hemoji { font-size: 42px; }
  .xp-stage { margin: 0 16px; padding: 18px; }
  .xp-s1 { font-size: 1rem; }
  .xp-bottom { padding: 12px 16px 20px; }
  .xpt-wrap { width: 76px; height: 118px; }
  .xp-hook { font-size: 1.1rem; }
}

/* ══════════════════════════════════════════════════════════════
   TOPICS — Video-card feed (vertical list)
   ══════════════════════════════════════════════════════════════ */

.topics-section { padding: 0 32px 48px; max-width: 860px; }

/* Vertical stack */
.topics-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

/* Each topic = horizontal video-preview card */
.topic-item {
  display: flex;
  align-items: center;
  gap: 0;
  background: var(--surface);
  border-radius: 16px;
  overflow: hidden;
  box-shadow: 0 2px 14px rgba(0,0,0,.07);
  border: 1px solid var(--border);
  transition: transform var(--transition), box-shadow var(--transition);
  cursor: default;
  min-height: 96px;
}
.topic-item:hover {
  transform: translateX(4px);
  box-shadow: 0 6px 28px rgba(0,0,0,.12);
}
.topic-item.topic-active {
  border-color: var(--gc, #7C3AED);
  box-shadow: 0 6px 28px rgba(124,58,237,.18);
}

/* Left coloured thumbnail strip */
.topic-thumb {
  width: 90px;
  min-height: 96px;
  flex-shrink: 0;
  background: linear-gradient(160deg, var(--gc, #7C3AED), var(--gc2, #A855F7));
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  position: relative;
  overflow: hidden;
}
.topic-thumb::after {
  content: '';
  position: absolute; inset: 0;
  background: radial-gradient(ellipse at 30% 30%, rgba(255,255,255,.18), transparent 60%);
}
.topic-num {
  font-size: 1.5rem;
  font-weight: 900;
  color: rgba(255,255,255,.55);
  line-height: 1;
  position: relative; z-index: 1;
}
.topic-play-icon {
  font-size: 1.1rem;
  color: rgba(255,255,255,.9);
  position: relative; z-index: 1;
}

/* Main content area */
.topic-body {
  flex: 1;
  padding: 16px 18px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
}
.topic-item-head {
  display: flex;
  align-items: center;
  gap: 10px;
}
.topic-name {
  font-weight: 800;
  font-size: 1rem;
  line-height: 1.3;
  flex: 1;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.topic-diff { display: flex; gap: 2px; flex-shrink: 0; }
.topic-diff span { font-size: .72rem; }

/* Play button — right side */
.topic-play-btn {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 7px 16px;
  border-radius: 30px;
  background: linear-gradient(135deg, var(--gc, #7C3AED), var(--gc2, #A855F7));
  color: #fff;
  font-size: .82rem;
  font-weight: 800;
  border: none;
  transition: all var(--transition);
  box-shadow: 0 3px 10px rgba(124,58,237,.22);
  align-self: center;
  margin-right: 18px;
}
.topic-play-btn::before { content: '▶'; font-size: .68rem; }
.topic-play-btn:hover { transform: scale(1.06); box-shadow: 0 6px 18px rgba(124,58,237,.38); }
.topic-play-btn.playing {
  background: linear-gradient(135deg, #10B981, #059669);
  box-shadow: 0 4px 14px rgba(16,185,129,.35);
}
.topic-play-btn.playing::before { content: '◼'; }

/* ─── Exam Prep View ────────────────────────────── */
.exam-prep-container {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 24px 48px;
}

.exam-prep-hero {
  padding: 32px 0 24px;
}
.exam-prep-hero .hero-breadcrumb {
  font-size: .8rem; color: var(--text-muted); margin-bottom: 12px;
  display: inline-flex; align-items: center; gap: 4px;
  background: var(--surface); border: 1px solid var(--border);
  padding: 4px 12px; border-radius: 30px;
  transition: background .15s;
}
.exam-prep-hero .hero-breadcrumb:hover { background: var(--accent-light); }
.exam-prep-hero h1 {
  font-size: 2rem; font-weight: 900; margin-bottom: 6px;
  background: linear-gradient(135deg, var(--accent), #06B6D4);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.exam-prep-hero p {
  font-size: .92rem; color: var(--text-muted);
}

/* Mode tabs */
.exam-mode-tabs {
  display: flex; gap: 8px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 50px;
  padding: 5px;
  width: fit-content;
  margin-bottom: 24px;
  box-shadow: 0 2px 8px rgba(0,0,0,.06);
}
.exam-tab {
  padding: 8px 22px; border-radius: 40px;
  font-weight: 800; font-size: .88rem;
  color: var(--text-muted);
  transition: background .2s, color .2s, box-shadow .2s;
}
.exam-tab.active {
  background: linear-gradient(135deg, var(--accent), #06B6D4);
  color: #fff;
  box-shadow: 0 3px 12px rgba(124,58,237,.3);
}

/* Setup card */
.exam-setup {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 28px;
  box-shadow: 0 4px 20px rgba(0,0,0,.07);
  display: flex; flex-direction: column; gap: 22px;
}
.exam-setup-row { display: flex; flex-direction: column; gap: 10px; }
.exam-setup-label {
  font-weight: 800; font-size: .8rem; letter-spacing: .07em;
  text-transform: uppercase; color: var(--text-muted);
}

.exam-subject-btns { display: flex; flex-wrap: wrap; gap: 8px; }
.exam-subject-btn {
  padding: 9px 20px; border-radius: 30px;
  border: 2px solid var(--border);
  background: var(--bg); color: var(--text);
  font-weight: 700; font-size: .88rem;
  transition: border-color .15s, background .15s, color .15s, box-shadow .15s;
}
.exam-subject-btn.active,
.exam-subject-btn:hover {
  border-color: var(--accent);
  background: var(--accent-light);
  color: var(--accent);
  box-shadow: 0 2px 8px rgba(124,58,237,.15);
}

.exam-diff-btns { display: flex; flex-wrap: wrap; gap: 8px; }
.exam-diff-btn {
  padding: 9px 20px; border-radius: 30px;
  border: 2px solid var(--border);
  background: var(--bg); color: var(--text);
  font-weight: 700; font-size: .88rem;
  transition: border-color .15s, background .15s, color .15s;
}
.exam-diff-btn.active { border-color: #059669; background: #D1FAE5; color: #065F46; }
.exam-diff-btn:hover:not(.active) { border-color: var(--border); background: var(--surface); }

.exam-start-btn {
  align-self: flex-start;
  padding: 13px 32px !important;
  font-size: 1rem !important;
  border-radius: 50px !important;
  background: linear-gradient(135deg, var(--accent), #06B6D4) !important;
  box-shadow: 0 4px 18px rgba(124,58,237,.3) !important;
}
.exam-start-btn:hover { transform: scale(1.04) !important; }

/* Exam session */
.exam-progress-wrap {
  display: flex; align-items: center; gap: 12px; margin-bottom: 20px;
}
.exam-progress-bar {
  flex: 1; height: 8px; background: var(--border); border-radius: 8px; overflow: hidden;
}
.exam-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), #06B6D4);
  border-radius: 8px;
  transition: width .4s ease;
}
.exam-q-counter { font-size: .82rem; font-weight: 700; color: var(--text-muted); white-space: nowrap; }

.exam-question-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 28px;
  box-shadow: 0 4px 20px rgba(0,0,0,.07);
}

/* ─── Video record button in explainer ─────────── */
.xp-rec-btn {
  width: 40px; height: 40px; border-radius: 50%;
  background: rgba(239,68,68,.1); border: 1px solid rgba(239,68,68,.25);
  color: #EF4444; font-size: 15px; cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  transition: background .2s, transform .15s, box-shadow .2s;
  flex-shrink: 0;
}
.xp-rec-btn:hover { background: rgba(239,68,68,.2); transform: scale(1.12); }
.xp-rec-btn.recording {
  background: #EF4444;
  border-color: #EF4444;
  color: #fff;
  box-shadow: 0 0 16px rgba(239,68,68,.5);
  animation: xpRecPulse 1.2s ease-in-out infinite;
}
@keyframes xpRecPulse {
  0%,100% { box-shadow: 0 0 10px rgba(239,68,68,.45); }
  50%      { box-shadow: 0 0 24px rgba(239,68,68,.8);  }
}

/* ─── Experiments section ───────────────────────── */
.experiments-section { padding: 0 32px 32px; max-width: 900px; }
.experiments-list { display: flex; flex-direction: column; gap: 12px; }

.experiment-card {
  display: flex; align-items: center; gap: 0;
  background: var(--surface);
  border-radius: 16px; overflow: hidden;
  box-shadow: 0 2px 14px rgba(0,0,0,.07);
  border: 1px solid var(--border);
  transition: transform .18s, box-shadow .18s;
  min-height: 88px;
}
.experiment-card:hover { transform: translateX(4px); box-shadow: 0 6px 28px rgba(0,0,0,.12); }

.experiment-card-icon {
  width: 78px; min-height: 88px; flex-shrink: 0;
  background: linear-gradient(160deg, #0EA5E9, #6366F1);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.8rem;
}

.experiment-card-body {
  flex: 1; padding: 14px 16px; display: flex; flex-direction: column; gap: 3px; min-width: 0;
}
.experiment-card-theme {
  font-size: .68rem; font-weight: 800; letter-spacing: .08em;
  text-transform: uppercase; color: #6366F1; opacity: .8;
}
.experiment-card-title {
  font-weight: 800; font-size: .98rem; color: var(--text); line-height: 1.3;
}
.experiment-card-desc {
  font-size: .78rem; color: var(--text-muted); line-height: 1.4;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}

.experiment-card-actions {
  display: flex; flex-direction: column; align-items: center; gap: 6px;
  flex-shrink: 0; margin-right: 16px;
}
.experiment-card-btn {
  padding: 8px 18px; border-radius: 30px;
  background: linear-gradient(135deg, #0EA5E9, #6366F1);
  color: #fff; font-size: .8rem; font-weight: 800; border: none; cursor: pointer;
  box-shadow: 0 3px 10px rgba(99,102,241,.25);
  text-align: center; line-height: 1.35;
  transition: transform .15s, box-shadow .15s;
}
.experiment-card-btn:hover { transform: scale(1.06); box-shadow: 0 6px 18px rgba(99,102,241,.4); }
.experiment-card-pdf {
  display: inline-block; font-size: .73rem; font-weight: 700;
  color: #6366F1; text-decoration: none;
  padding: 3px 10px; border-radius: 20px;
  border: 1.5px solid #c7d2fe; background: #f5f3ff;
  transition: background .15s;
  white-space: nowrap;
}
.experiment-card-pdf:hover { background: #ede9fe; }

@media (max-width: 600px) {
  .topics-section { padding: 0 16px 40px; }
  .topic-thumb { width: 70px; }
  .topic-play-btn { padding: 6px 12px; font-size: .76rem; margin-right: 12px; }
  .topic-name { font-size: .92rem; }
  .experiments-section { padding: 0 16px 32px; }
  .experiment-card-icon { width: 60px; font-size: 1.4rem; }
  .experiment-card-actions { margin-right: 12px; }
  .experiment-card-btn { padding: 7px 12px; font-size: .75rem; }
}

/* ================================================================
   SIMULATION MODAL
   ================================================================ */
.sim-overlay {
  position: fixed; inset: 0;
  background: rgba(0,0,0,.6);
  backdrop-filter: blur(5px);
  -webkit-backdrop-filter: blur(5px);
  z-index: 5000;
  display: flex;
  align-items: flex-start;   /* ← flex-start: Modal startet oben, scrollt nach unten */
  justify-content: center;
  padding: 16px;
  overflow-y: auto;
}
.sim-box {
  background: #fff;
  border-radius: 18px;
  padding: 22px 22px 18px;
  width: 100%; max-width: 760px;
  box-shadow: 0 28px 90px rgba(0,0,0,.28);
  position: relative;
  margin: auto 0;            /* vertikal zentriert wenn kleiner als Viewport */
}
.sim-x {
  position: absolute; top: 14px; right: 16px;
  background: #f1f5f9; border: none;
  width: 36px; height: 36px; border-radius: 50%;
  font-size: 1rem; cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  color: #475569; transition: background .15s;
}
.sim-x:hover { background: #e2e8f0; color: #1e293b; }
.sim-h3 {
  font-size: 1.12rem; font-weight: 800; color: #1e293b;
  margin: 0 0 14px; padding-right: 44px;
}
.sim-road-canvas {
  width: 100%; border-radius: 10px;
  display: block; background: #f0f9ff;
}
.sim-chart-canvas { width: 100%; display: block; margin-top: 4px; }
.sim-info-row {
  display: flex; gap: 10px; flex-wrap: wrap;
  align-items: center; padding: 10px 2px 6px;
  font-size: .88rem; color: #334155;
}
.sim-info-row span {
  background: #f8fafc; border: 1px solid #e2e8f0;
  border-radius: 8px; padding: 4px 10px;
}
.sim-info-row b { color: #1e293b; }
.sim-btn-row { display: flex; gap: 8px; flex-wrap: wrap; padding: 6px 0 4px; }
.sim-btn {
  display: inline-block;
  padding: 8px 18px; border-radius: 30px;
  border: 2px solid #e2e8f0; background: #f8fafc;
  color: #475569; font-size: .88rem; font-weight: 700;
  cursor: pointer; transition: all .15s;
  font-family: inherit; text-decoration: none;
  box-sizing: border-box;
}
.sim-btn:hover { background: #e2e8f0; color: #1e293b; }
.sim-btn.primary { background: #7C3AED; color: #fff; border-color: #7C3AED; }
.sim-btn.primary:hover { background: #6D28D9; border-color: #6D28D9; }
.sim-hint {
  font-size: .82rem; color: #64748b; line-height: 1.5;
  margin: 8px 0 4px;
  padding: 8px 12px;
  background: #f8fafc; border-radius: 8px;
  border-left: 3px solid #7C3AED;
}
.sim-diagram-label {
  font-size: .88rem; font-weight: 700; color: #334155;
  margin: 10px 0 4px;
}
.sim-result {
  font-size: .9rem; color: #334155;
  padding: 7px 12px; background: #f0fdf4;
  border-radius: 8px; margin-top: 6px;
  min-height: 0;
}
.sim-result:empty { display: none; }
.sim-v-result { color: #16a34a; font-size: 1.05rem; }
.sim-table {
  width: 100%; border-collapse: collapse;
  font-size: .82rem; margin-top: 10px;
}
.sim-table th {
  background: #f1f5f9; padding: 6px 10px;
  text-align: left; font-weight: 700;
  color: #475569; border-bottom: 2px solid #e2e8f0;
}
.sim-table td {
  padding: 5px 10px; border-bottom: 1px solid #f1f5f9; color: #334155;
}
.sim-table tr:last-child td { border-bottom: none; }

@media (max-width: 600px) {
  .sim-box { padding: 16px 14px 14px; }
  .sim-h3 { font-size: .96rem; }
  .sim-btn { padding: 7px 12px; font-size: .8rem; }
}

/* ── PhysicsSim-Framework Layout ─────────────────────────── */
.phys-layout {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin: 8px 0;
}
.phys-anim-cv,
.phys-chart-cv {
  width: 100%;
  border-radius: 10px;
  display: block;
  background: #f0f9ff;
}
.phys-controls {
  padding: 6px 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.phys-ctrl {
  display: flex;
  flex-direction: column;
  gap: 3px;
}
.phys-ctrl-label {
  font-size: .82rem;
  font-weight: 700;
  color: #374151;
}
.phys-hint {
  font-size: .79rem;
  color: #64748b;
  padding: 6px 10px;
  background: #f8fafc;
  border-radius: 8px;
  border-left: 3px solid #7c3aed;
  margin: 4px 0;
}
.sim-box-wide { max-width: 900px !important; }

/* ── VOLLBILD fuer den Beamer im Physikraum ────────────────────────────
   Im Vollbild ist nicht die Leinwand das Problem, sondern der Text daneben:
   Regler, Statuszeile und Wertetabelle sind fuer 760 px gebaut. Deshalb
   waechst der Schriftgrad ueber eine Variable mit, statt die Kiste bloss
   breiter zu ziehen. Die Leinwaende bekommen ihre Aufloesung aus
   _simSkala() - hier steht nur das Layout. */
.sim-voll {
  position: absolute; top: 14px; right: 60px;
  background: #0f766e; color: #fff; border: none;
  padding: 8px 14px; border-radius: 999px;
  font: 600 .82rem/1 inherit; letter-spacing: .01em;
  cursor: pointer; white-space: nowrap;
  box-shadow: 0 2px 8px rgba(15,118,110,.35);
}
.sim-voll:hover  { background: #115e59; }
.sim-voll:focus-visible { outline: 3px solid #99f6e4; outline-offset: 2px; }

#physModal.sim-gross { padding: 0; overflow: auto; background: #0b1220; }
#physModal.sim-gross .sim-box {
  max-width: none !important;
  width: 100%; min-height: 100vh;
  border-radius: 0; margin: 0;
  padding: clamp(12px, 1.3vw, 26px);   /* jeder Pixel Rand fehlt dem Bild */
  font-size: clamp(1rem, 1.05vw, 1.6rem);      /* traegt alle em-Masse mit */
}
/* Der Titel darf lesbar sein, aber nicht ein Zehntel der Wand fressen -
   gemessen kostete er mit 3rem 109 px Hoehe, die dem Bild fehlten. */
#physModal.sim-gross .sim-h3 {
  font-size: clamp(1.25rem, 1.5vw, 2rem);
  margin: 0 0 .4em;
}
#physModal.sim-gross .fpm-note,
#physModal.sim-gross .sim-hint    { font-size: .82em; }
#physModal.sim-gross .lmp-status,
#physModal.sim-gross .fpm-fitline { font-size: .92em; }
#physModal.sim-gross .sim-table   { font-size: .86em; }
#physModal.sim-gross .sim-btn     { font-size: .9em; padding: .55em 1.1em; }
#physModal.sim-gross .phys-ctrl-label { font-size: .88em; }
#physModal.sim-gross input[type=range] { height: 1.6em; }
#physModal.sim-gross .sim-voll,
#physModal.sim-gross .sim-x { top: clamp(14px, 1.4vw, 28px); }
#physModal.sim-gross .sim-x { right: clamp(16px, 1.6vw, 32px); }
#physModal.sim-gross .sim-voll { right: clamp(60px, 6vw, 150px); }

/* Zwei Spalten sind am Beamer von hinten schlechter zu lesen als eine
   breite - ab hier laeuft die Simulation ueber die volle Wand. */
@media (min-width: 1100px) {
  /* Am Beamer ist das BILD die Hauptsache - der Text daneben ist Beiwerk.
     Zwei gleiche Spalten verschenken die halbe Wand an eine Statuszeile. */
  /* Sehr breite Bildspalte: Die endgueltige Groesse legt _simBildAnpassen()
     fest, begrenzt von der Bildschirmhoehe. Waere die Spalte hier eng, wuerde
     SIE begrenzen und die Hoehe blieb ungenutzt. */
  #physModal.sim-gross .fpm-grid,
  #physModal.sim-gross .fpm-grid2 {
    grid-template-columns: minmax(0, 3fr) minmax(280px, 1fr);
    align-items: start;
  }
}
@media (max-width: 1099px) {
  #physModal.sim-gross .fpm-grid,
  #physModal.sim-gross .fpm-grid2 { grid-template-columns: 1fr; }
}

/* ================================================================
   ERKLÄRVIDEO PLAYER + 3D CHARAKTER MR. LALA
   ================================================================ */
.ev-overlay{position:fixed;inset:0;z-index:9000;background:rgba(0,0,0,.85);display:flex;align-items:center;justify-content:center;backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);animation:evOverlayIn .25s ease}
.ev-overlay.hidden{display:none}
@keyframes evOverlayIn{from{opacity:0}to{opacity:1}}
.ev-player{position:relative;width:min(420px,96vw);height:min(720px,92vh);background:#0e0820;border-radius:24px;overflow:hidden;display:flex;flex-direction:column;box-shadow:0 0 80px rgba(124,58,237,.6),0 0 0 1.5px rgba(124,58,237,.4)}
.ev-topbar{display:flex;align-items:center;gap:10px;padding:14px 14px 0;position:absolute;top:0;left:0;right:0;z-index:10}
.ev-progress-track{flex:1;height:4px;background:rgba(255,255,255,.15);border-radius:4px;overflow:hidden}
.ev-progress-fill{height:100%;width:0%;background:linear-gradient(90deg,#7C3AED,#A78BFA);border-radius:4px;transition:width .1s linear}
.ev-close-btn{background:rgba(255,255,255,.1);border:none;color:white;width:28px;height:28px;border-radius:50%;font-size:12px;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:background .2s}
.ev-close-btn:hover{background:rgba(255,255,255,.25)}
.ev-stage{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:60px 20px 16px;text-align:center;position:relative;overflow:hidden}
.ev-controls{display:flex;align-items:center;justify-content:space-between;padding:12px 20px 20px;background:rgba(0,0,0,.3)}
.ev-ctrl-btn{background:rgba(255,255,255,.1);border:none;color:white;width:40px;height:40px;border-radius:50%;font-size:16px;cursor:pointer;transition:background .2s}
.ev-ctrl-btn:hover{background:rgba(255,255,255,.25)}
.ev-scene-dots{display:flex;gap:6px;align-items:center}
.ev-dot{width:6px;height:6px;border-radius:50%;background:rgba(255,255,255,.25);transition:all .3s}
.ev-dot.active{background:#A78BFA;width:20px;border-radius:3px}
.ev-hook-title{font-family:'Poppins',sans-serif;font-size:clamp(48px,14vw,72px);font-weight:900;background:linear-gradient(135deg,#FBBF24,#F472B6,#A78BFA);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;letter-spacing:-2px;line-height:1;animation:evBounceIn .5s cubic-bezier(.36,.07,.19,.97)}
.ev-hook-sub{font-family:'Nunito',sans-serif;font-size:15px;color:rgba(255,255,255,.7);margin-top:12px;animation:evFadeUp .5s .3s both ease}
.ev-fraction-big{display:inline-flex;flex-direction:column;align-items:center;font-family:'Poppins',sans-serif;font-size:clamp(40px,12vw,60px);font-weight:900;color:white;gap:2px;animation:evScaleIn .5s cubic-bezier(.36,.07,.19,.97)}
.ev-fraction-big .ev-frac-num{color:#FBBF24}
.ev-fraction-big .ev-frac-bar{width:56px;height:5px;background:linear-gradient(90deg,#FBBF24,#F472B6);border-radius:3px;margin:2px 0}
.ev-fraction-big .ev-frac-den{color:rgba(255,255,255,.85)}
.ev-label-badge{display:inline-block;background:rgba(124,58,237,.45);border:1.5px solid #7C3AED;border-radius:20px;padding:4px 14px;font-family:'Nunito',sans-serif;font-size:13px;font-weight:700;color:#A78BFA;margin:4px;animation:evFadeUp .4s both ease}
.ev-explain-text{font-family:'Nunito',sans-serif;font-size:clamp(14px,4vw,17px);font-weight:700;color:rgba(255,255,255,.9);line-height:1.5;animation:evFadeUp .5s .1s both ease}
.ev-glow-pulse{animation:evGlowPulse 1.2s ease-in-out infinite}
.ev-merksatz{background:linear-gradient(135deg,rgba(124,58,237,.35),rgba(167,139,250,.15));border:1.5px solid rgba(167,139,250,.5);border-radius:18px;padding:22px 20px;animation:evScaleIn .5s cubic-bezier(.36,.07,.19,.97)}
.ev-merksatz h3{font-family:'Poppins',sans-serif;font-size:14px;font-weight:700;color:#FBBF24;margin:0 0 12px;text-transform:uppercase;letter-spacing:1px}
.ev-merksatz p{font-family:'Nunito',sans-serif;font-size:16px;font-weight:700;color:white;margin:8px 0;line-height:1.5}
.ev-merksatz .ev-word-hl{color:#A78BFA;text-shadow:0 0 20px rgba(167,139,250,.8)}
.ev-outro-text{font-family:'Poppins',sans-serif;font-size:clamp(22px,6vw,32px);font-weight:900;color:white;line-height:1.3;animation:evBounceIn .5s cubic-bezier(.36,.07,.19,.97)}
.ev-outro-next{margin-top:16px;background:linear-gradient(135deg,#7C3AED,#A855F7);border-radius:30px;padding:12px 24px;display:inline-block;font-family:'Nunito',sans-serif;font-size:14px;font-weight:800;color:white;animation:evFadeUp .5s .4s both ease;box-shadow:0 0 30px rgba(124,58,237,.6)}
.ev-particles{position:absolute;inset:0;pointer-events:none;overflow:hidden}
.ev-particle{position:absolute;width:6px;height:6px;border-radius:50%;animation:evParticleFly 1.5s ease-out forwards}
.ev-bg-label{position:absolute;font-size:120px;opacity:.04;font-family:'Poppins',sans-serif;font-weight:900;pointer-events:none;user-select:none;animation:evBgLabelSpin 8s linear infinite}
.ev-choco{display:grid;grid-template-columns:repeat(4,1fr);gap:4px;padding:8px;background:#3d1a00;border-radius:10px;animation:evBounceIn .5s cubic-bezier(.36,.07,.19,.97)}
.ev-choco-piece{width:44px;height:38px;border-radius:5px;background:#7B3F00;box-shadow:inset 0 -3px 0 rgba(0,0,0,.3);transition:background .4s,box-shadow .4s}
.ev-choco-piece.marked{background:#FF6B35;box-shadow:inset 0 -3px 0 rgba(0,0,0,.3),0 0 12px rgba(255,107,53,.8)}
.ev-food-row{display:flex;gap:16px;justify-content:center;flex-wrap:wrap}
.ev-food-icon{font-size:48px;animation:evFoodPop .4s cubic-bezier(.36,.07,.19,.97) both}
.ev-topic-btn{display:inline-flex;align-items:center;gap:8px;background:linear-gradient(135deg,#7C3AED,#6D28D9);border:none;color:white;cursor:pointer;padding:6px 12px;border-radius:20px;font-family:'Nunito',sans-serif;font-size:12px;font-weight:700;transition:transform .15s,box-shadow .15s;box-shadow:0 2px 12px rgba(124,58,237,.4);margin-top:6px}
.ev-topic-btn:hover{transform:translateY(-1px);box-shadow:0 4px 18px rgba(124,58,237,.6)}
/* Character */
.ev-char-wrap{display:inline-block;animation:evCharBreathe 3.5s ease-in-out infinite}
.ev-char-svg{display:block}
.ev-mouth-talk{display:none}
.ev-char-talking .ev-mouth-smile{display:none}
.ev-char-talking .ev-mouth-talk{display:block;animation:evCharTalkAnim .18s ease-in-out infinite alternate}
.ev-arm-pointing{display:none}
.ev-char-pointing .ev-arm-default{display:none}
.ev-char-pointing .ev-arm-pointing{display:block;animation:evArmAppear .5s cubic-bezier(.34,1.56,.64,1) both}
.ev-arm-celebrate{display:none}
.ev-char-celebrating .ev-arm-default{display:none}
.ev-char-celebrating .ev-arm-celebrate{display:block}
.ev-char-celebrating{animation:evCharCelebrate .45s ease-in-out infinite alternate !important}
.ev-char-celebrating .ev-mouth-smile{display:none}
.ev-char-celebrating .ev-mouth-talk{display:block}
.ev-lid-l{transform-box:fill-box;transform-origin:center;animation:evBlink 4.2s ease-in-out infinite}
.ev-lid-r{transform-box:fill-box;transform-origin:center;animation:evBlink 4.2s ease-in-out infinite .12s}
.ev-scene-split{display:flex;align-items:flex-end;gap:6px;width:100%;height:100%;padding-top:8px}
.ev-split-char{width:128px;flex-shrink:0;display:flex;flex-direction:column;align-items:center;justify-content:flex-end;padding-bottom:6px}
.ev-split-content{flex:1;display:flex;flex-direction:column;align-items:flex-start;justify-content:center;text-align:left;overflow:hidden;padding-right:4px}
.ev-char-name-lbl{font-family:'Nunito',sans-serif;font-size:10px;font-weight:700;color:rgba(255,255,255,.55);margin-top:4px;background:rgba(255,255,255,.08);border-radius:10px;padding:2px 10px}
.ev-speech-bubble{background:rgba(255,255,255,.08);border:1.5px solid rgba(255,255,255,.15);border-radius:16px 16px 16px 4px;padding:12px 14px;font-family:'Nunito',sans-serif;font-size:13px;font-weight:700;color:white;line-height:1.5;animation:evFadeUp .4s .15s both ease;position:relative}
.ev-speech-bubble::before{content:'';position:absolute;left:-7px;bottom:14px;width:0;height:0;border-style:solid;border-width:7px 7px 0 0;border-color:rgba(255,255,255,.15) transparent transparent transparent}
@keyframes evSceneEnter{from{transform:translateY(14px) scale(.97);opacity:0}to{transform:translateY(0) scale(1);opacity:1}}
@keyframes evBounceIn{0%{transform:scale(.3);opacity:0}60%{transform:scale(1.1);opacity:1}80%{transform:scale(.95)}100%{transform:scale(1)}}
@keyframes evFadeUp{from{transform:translateY(20px);opacity:0}to{transform:translateY(0);opacity:1}}
@keyframes evScaleIn{from{transform:scale(.7);opacity:0}to{transform:scale(1);opacity:1}}
@keyframes evGlowPulse{0%,100%{filter:drop-shadow(0 0 4px #FBBF24)}50%{filter:drop-shadow(0 0 18px #FBBF24) drop-shadow(0 0 30px #F472B6)}}
@keyframes evParticleFly{0%{transform:translate(0,0) scale(1);opacity:1}100%{transform:translate(var(--dx),var(--dy)) scale(0);opacity:0}}
@keyframes evBgLabelSpin{from{transform:rotate(0deg)}to{transform:rotate(360deg)}}
@keyframes evFoodPop{0%{transform:scale(0) rotate(-20deg);opacity:0}70%{transform:scale(1.2) rotate(5deg);opacity:1}100%{transform:scale(1) rotate(0deg)}}
@keyframes evCharBreathe{0%,100%{transform:translateY(0)}50%{transform:translateY(-4px)}}
@keyframes evCharTalkAnim{from{transform:scaleY(.55)}to{transform:scaleY(1)}}
@keyframes evCharCelebrate{from{transform:translateY(0) rotate(-4deg)}to{transform:translateY(-12px) rotate(4deg)}}
@keyframes evBlink{0%,88%,100%{transform:scaleY(1)}93%{transform:scaleY(14)}}
@keyframes evArmAppear{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}

/* ── Fach-Karten im Prüfungsmodus ───────────────────────────── */
.exam-subj-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-top:8px}
.exam-subj-card{background:var(--bg);border:2px solid rgba(0,0,0,.07);border-radius:16px;padding:20px 18px;display:flex;flex-direction:column;gap:10px;transition:box-shadow .18s,transform .18s}
.exam-subj-card:hover{box-shadow:0 6px 24px rgba(0,0,0,.1);transform:translateY(-2px)}
.esc-top{display:flex;align-items:center;gap:12px}
.esc-icon{font-size:2rem;line-height:1}
.esc-name{font-size:1.1rem;font-weight:800;color:var(--sc,#7C3AED)}
.esc-count{font-size:.78rem;color:var(--text-muted);font-weight:600}
.esc-topics{font-size:.78rem;color:var(--text-muted);line-height:1.5;border-top:1px solid rgba(0,0,0,.06);padding-top:10px}
.esc-start{margin-top:4px;background:var(--sc,#7C3AED);color:#fff;border:none;border-radius:10px;padding:10px 0;font-size:.9rem;font-weight:700;cursor:pointer;transition:opacity .15s}
.esc-start:hover{opacity:.88}
@media(max-width:540px){.exam-subj-grid{grid-template-columns:1fr}}
/* ── Themen-Label auf Prüfungsfragen ────────────────────────── */
.exam-q-topic{display:inline-block;background:rgba(124,58,237,.1);color:#6D28D9;font-size:.72rem;font-weight:700;padding:3px 11px;border-radius:20px;margin-bottom:10px}
/* ── Browser-KI badge & download screen ─────────────────────── */
.bai-badge{display:inline-flex;align-items:center;gap:6px;font-size:.78rem;font-weight:700;padding:5px 14px;border-radius:20px;background:rgba(124,58,237,.1);color:#6D28D9;margin:8px auto 4px;text-align:center}
.bai-badge.bai-ok{background:rgba(22,163,74,.12);color:#15803D}
.bai-badge.bai-spin{background:rgba(234,179,8,.12);color:#92400E}
.bai-dl-screen{display:flex;flex-direction:column;align-items:center;gap:10px;padding:32px 20px}
.bai-dl-icon{font-size:2.8rem;animation:evCharBreathe 2s ease-in-out infinite}
.bai-dl-title{font-size:1.1rem;font-weight:800;color:#1E293B}
.bai-dl-sub{font-size:.82rem;color:#64748B;text-align:center;max-width:280px}
.bai-bar-wrap{width:100%;max-width:280px;height:10px;background:#E2E8F0;border-radius:99px;overflow:hidden}
.bai-bar-fill{height:100%;background:linear-gradient(90deg,#7C3AED,#A855F7);border-radius:99px;transition:width .3s ease}
.bai-dl-pct{font-size:.9rem;font-weight:700;color:#7C3AED}
@media(max-width:480px){.ev-player{border-radius:0;width:100vw;height:100vh}.ev-choco-piece{width:36px;height:30px}}

/* ================================================================
   LERNANALYSE
   ================================================================ */
.analyse-container{padding:24px 28px 48px;max-width:780px}
.analyse-title{font-size:1.7rem;font-weight:900;margin:8px 0 14px;background:linear-gradient(135deg,var(--accent),#06B6D4);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.analyse-user-info{display:flex;gap:10px;align-items:center;margin-bottom:18px;flex-wrap:wrap}
.an-name{font-weight:800;font-size:.95rem;color:var(--text)}
.an-goal{font-size:.78rem;font-weight:700;background:rgba(124,58,237,.1);color:#6D28D9;padding:3px 12px;border-radius:20px}

/* Stat cards grid */
.analyse-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(160px,1fr));gap:12px;margin-bottom:22px}
.an-card{background:var(--surface);border:1px solid var(--border);border-radius:16px;padding:16px 14px;display:flex;flex-direction:column;gap:4px;box-shadow:0 2px 12px rgba(0,0,0,.06);transition:transform .18s,box-shadow .18s}
.an-card:hover{transform:translateY(-2px);box-shadow:0 6px 22px rgba(0,0,0,.1)}
.an-icon{font-size:1.6rem;line-height:1;margin-bottom:2px}
.an-val{font-size:1.5rem;font-weight:900;line-height:1}
.an-lbl{font-size:.8rem;font-weight:800;color:var(--text)}
.an-avg{font-size:.72rem;color:var(--text-muted);line-height:1.4}
.an-bar-wrap{height:6px;background:var(--border);border-radius:6px;overflow:hidden;margin-top:6px}
.an-bar{height:100%;border-radius:6px;transition:width .5s ease}

/* AI card */
.analyse-ai-card{background:var(--surface);border:1px solid var(--border);border-radius:16px;padding:18px 18px;margin-bottom:20px;box-shadow:0 2px 12px rgba(0,0,0,.06)}
.analyse-ai-header{display:flex;align-items:center;gap:8px;margin-bottom:8px;font-size:.85rem;font-weight:700;color:var(--text-muted)}
.analyse-ai-avatar{font-size:1.3rem}
.analyse-ai-text{font-size:.9rem;color:var(--text);line-height:1.6;white-space:pre-line}

/* Weak/strong topics */
.an-weak-title{font-size:.85rem;font-weight:800;text-transform:uppercase;letter-spacing:.06em;color:var(--text-muted);margin:0 0 10px}
.an-weak-list{display:flex;flex-direction:column;gap:8px;margin-bottom:4px}
.an-weak-item{display:flex;align-items:center;gap:10px;font-size:.84rem;font-weight:700;color:var(--text)}
.an-weak-item span:first-child{min-width:160px}
.an-topic-bar-wrap{flex:1;height:7px;background:var(--border);border-radius:6px;overflow:hidden}
.an-topic-bar{height:100%;border-radius:6px;transition:width .5s ease}
.an-weak-score{min-width:42px;text-align:right;font-size:.8rem;font-weight:800}
.an-strong{font-size:.85rem;color:var(--text-muted);font-style:italic;padding:6px 0}
.an-empty{font-size:.9rem;color:var(--text-muted);font-style:italic;text-align:center;padding:28px 0}

/* Recent sessions */
.an-recent{background:var(--surface);border:1px solid var(--border);border-radius:16px;padding:16px 18px;margin-bottom:18px;box-shadow:0 2px 12px rgba(0,0,0,.06)}
.an-recent-row{display:flex;align-items:center;gap:10px;padding:6px 0;border-bottom:1px solid var(--border);font-size:.82rem;flex-wrap:wrap}
.an-recent-row:last-child{border-bottom:none}
.an-recent-mode{font-weight:800;color:var(--accent);min-width:72px}
.an-recent-sub{font-weight:700;color:var(--text-muted);min-width:72px}
.an-recent-score{font-weight:800;min-width:90px}
.an-recent-dt{color:var(--text-muted);font-size:.75rem;margin-left:auto}

@media(max-width:540px){
  .analyse-container{padding:16px 14px 40px}
  .analyse-grid{grid-template-columns:1fr 1fr}
  .an-weak-item span:first-child{min-width:100px;font-size:.78rem}
  .an-recent-row{gap:6px}
}

/* ================================================================
   ERKLÄRVIDEO – AKADEMISCHER LICHT-STIL (evs-*)
   Abgeleitet vom Video-Stil: Split-Layout, Stimme, Schritt-Karten
   ================================================================ */

/* ── Hook-Szene ─────────────────────────────────────────────── */
.evs-hook{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:14px;width:100%;height:100%;padding:10px}
.evs-hook-vis{width:176px;height:98px;background:linear-gradient(160deg,#1a0035,#0e0820);border-radius:14px;display:flex;align-items:center;justify-content:center;overflow:hidden;padding:12px;animation:evBounceIn .5s cubic-bezier(.36,.07,.19,.97);box-shadow:0 4px 24px rgba(0,0,0,.28)}
.evs-hook-vis svg,.evs-hook-vis>*{width:100%;height:auto;max-height:75px}
.evs-hook-title{font-family:'Poppins',sans-serif;font-size:1.25rem;font-weight:900;color:#1E293B;text-align:center;animation:evFadeUp .5s .25s both;line-height:1.25}
.evs-hook-sub{font-size:.76rem;color:#64748B;font-weight:600;animation:evFadeUp .5s .45s both}

/* ── Split-Szene ─────────────────────────────────────────────── */
.evs-split{display:flex;width:100%;gap:12px;align-items:stretch;height:100%}
.evs-split-left{flex:1;display:flex;flex-direction:column;gap:12px;justify-content:center;min-width:0;padding-right:4px}
.evs-split-right{width:118px;flex-shrink:0;background:linear-gradient(160deg,#1a0035,#0e0820);border-radius:12px;display:flex;align-items:center;justify-content:center;overflow:hidden;padding:10px}
.evs-split-right svg{width:100%;height:auto;max-height:130px}
.evs-vis-pnl{width:100%;height:100%;display:flex;align-items:center;justify-content:center}
.evs-vis-pnl svg{width:100%;height:auto}
.evs-vis-empty{font-size:2.4rem}

/* ── Schritt-Karten ──────────────────────────────────────────── */
.evs-kp-label{font-size:.66rem;font-weight:800;text-transform:uppercase;letter-spacing:.08em;color:#7C3AED;margin-bottom:2px}
.evs-step{display:flex;align-items:flex-start;gap:10px;animation:evFadeUp .45s ease both}
.evs-step-n{width:26px;height:26px;border-radius:50%;background:#CBD5E1;color:#64748B;font-size:.78rem;font-weight:800;display:flex;align-items:center;justify-content:center;flex-shrink:0;margin-top:2px;transition:background .3s}
.evs-step-t{font-size:.82rem;color:#475569;line-height:1.55}
.evs-step-on .evs-step-n{background:#7C3AED;color:#fff}
.evs-step-on .evs-step-t{color:#1E293B;font-weight:700}
.evs-step-done .evs-step-n{background:#059669;color:#fff;font-size:.72rem}
.evs-step-done .evs-step-t{color:#94A3B8;font-weight:500;font-size:.78rem}

/* ── Erklär-Szene ─────────────────────────────────────────────── */
.evs-explain{display:flex;flex-direction:column;gap:10px;width:100%;height:100%;justify-content:center}
.evs-explain-lbl{font-size:.66rem;font-weight:800;text-transform:uppercase;letter-spacing:.08em;color:#7C3AED;margin-bottom:2px}
.evs-explain-txt{font-size:.78rem;color:#334155;line-height:1.65;max-height:96px;overflow:hidden}
.evs-explain-txt2{opacity:.78;font-size:.74rem}

/* ── Merksatz-Szene ──────────────────────────────────────────── */
.evs-merksatz-box{display:flex;flex-direction:column;gap:14px;width:100%;height:100%;justify-content:center}
.evs-merksatz-hd{font-size:.82rem;font-weight:800;color:#3E6E1E;padding-bottom:10px;border-bottom:2px solid rgba(62,110,30,.25);margin-bottom:2px}
.evs-mk-item{display:flex;align-items:flex-start;gap:10px;animation:evFadeUp .45s ease both}
.evs-mk-dot{width:26px;height:26px;border-radius:50%;background:#3E6E1E;color:#fff;font-size:.78rem;font-weight:800;display:flex;align-items:center;justify-content:center;flex-shrink:0;margin-top:2px}
.evs-mk-item span{font-size:.84rem;color:#1E293B;line-height:1.5;font-weight:600}

/* ============================================================
   PRÜFUNGSMODUS – Antwort-Buttons (ZAP / Abitur)
   ============================================================ */
.exam-q-text { font-size:1.08rem; font-weight:700; line-height:1.6; margin-bottom:22px; color:var(--text,#111); }

.exam-q-opts {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 8px;
}
.exam-q-opt {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px 18px;
  border-radius: 12px;
  border: 2px solid var(--border,#e5e7eb);
  background: #fff;
  cursor: pointer;
  text-align: left;
  font-family: inherit;
  font-size: .97rem;
  font-weight: 600;
  transition: border-color .13s, background .13s;
  width: 100%;
}
.exam-q-opt:hover:not(:disabled) { border-color: var(--gc,#7C3AED); background: var(--gl,#EDE9FE); }
.exam-q-opt:disabled { cursor: default; opacity: .75; }

.exam-opt-letter {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--gl,#EDE9FE);
  color: var(--gc,#7C3AED);
  font-weight: 900;
  font-size: .92rem;
  flex-shrink: 0;
}
.exam-correct { border-color:#059669 !important; background:#ECFDF5 !important; }
.exam-correct .exam-opt-letter { background:#059669; color:#fff; }
.exam-wrong   { border-color:#DC2626 !important; background:#FEF2F2 !important; }
.exam-wrong   .exam-opt-letter { background:#DC2626; color:#fff; }

.exam-q-fb { margin-top:16px; padding:14px 16px; border-radius:10px; font-size:.92rem; line-height:1.5; font-weight:600; }
.exam-fb-ok  { background:#ECFDF5; color:#065F46; border:1px solid #6EE7B7; }
.exam-fb-err { background:#FEF2F2; color:#991B1B; border:1px solid #FCA5A5; }

/* Fortschrittsbalken */
.exam-progress-bar  { height:6px; background:var(--border,#e5e7eb); border-radius:6px; overflow:hidden; margin-bottom:8px; }
.exam-progress-fill { height:100%; background:linear-gradient(90deg,var(--gc,#7C3AED),var(--gc2,#A855F7)); border-radius:6px; transition:width .4s; }
.exam-q-counter     { font-size:.82rem; font-weight:700; color:var(--text-muted,#6b7280); margin-bottom:16px; }

/* Key-Eingabe im Chat */
#groqKeyInp { box-sizing: border-box; }

/* ============================================================
   ZAP/ABITUR – ai-ex-opt Buttons (Aufgabenbank)
   ============================================================ */
.ai-ex-options {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin: 16px 0;
}
.ai-ex-opt {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 13px 16px;
  border-radius: 12px;
  border: 2px solid var(--border,#e5e7eb);
  background: #fff;
  cursor: pointer;
  text-align: left;
  font-family: inherit;
  font-size: .97rem;
  font-weight: 600;
  width: 100%;
  transition: border-color .13s, background .13s;
}
.ai-ex-opt:hover:not(:disabled) { border-color: var(--gc,#7C3AED); background: var(--gl,#EDE9FE); }
.ai-ex-opt:disabled { cursor: default; opacity: .75; }
.ai-ex-opt-letter {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background: var(--gl,#EDE9FE);
  color: var(--gc,#7C3AED);
  font-weight: 900;
  font-size: .88rem;
  flex-shrink: 0;
}
.ai-ex-opt.correct  { border-color:#059669 !important; background:#ECFDF5 !important; }
.ai-ex-opt.correct .ai-ex-opt-letter { background:#059669; color:#fff; }
.ai-ex-opt.wrong    { border-color:#DC2626 !important; background:#FEF2F2 !important; }
.ai-ex-opt.wrong    .ai-ex-opt-letter { background:#DC2626; color:#fff; }

.exam-q-topic { font-size:.8rem; font-weight:700; color:var(--gc,#7C3AED); margin-bottom:10px; }

/* ============================================================
   MODULGENERATOR – Styles
   ============================================================ */
.modul-header {
  background: linear-gradient(135deg, #6D28D9, #A855F7);
  color: white;
  padding: 16px 20px;
  border-radius: 16px 16px 0 0;
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  box-shadow: 0 4px 16px rgba(109,40,217,.35);
}
.modul-step-label { flex: 1; font-weight: 800; font-size: 1rem; letter-spacing: .01em; }
.modul-progress-bar { width: 100%; height: 8px; background: rgba(255,255,255,.25); border-radius: 4px; margin-top: 8px; overflow: hidden; }
.modul-progress-fill { height: 100%; background: linear-gradient(90deg,#FCD34D,#FDE68A); border-radius: 4px; transition: width .6s cubic-bezier(.34,1.56,.64,1); box-shadow: 0 0 10px rgba(252,211,77,.7); }
.modul-step-card {
  background: linear-gradient(180deg,#FAFBFF 0%,#F3F0FF 100%);
  border-radius: 0 0 16px 16px;
  padding: 26px 22px;
  box-shadow: 0 8px 32px rgba(109,40,217,.12);
  min-height: 320px;
  max-width: 720px;
  margin: 0 auto 24px;
}
.modul-step-card h2 { font-size: 1.25rem; font-weight: 900; color: #4C1D95; margin-bottom: 18px; display: flex; align-items: center; gap: 10px; }
.modul-kompetenz { text-align: center; padding: 8px 0 18px; }
.modul-kompetenz-icon { font-size: 3.5rem; margin-bottom: 12px; animation: evBounceIn .6s cubic-bezier(.36,.07,.19,.97); }
.modul-kompetenz-text {
  font-size: 1.1rem; font-weight: 700; color: #3B0764; line-height: 1.65;
  background: white; border-radius: 14px; padding: 18px 20px;
  border: 2px solid #DDD6FE; box-shadow: 0 4px 16px rgba(109,40,217,.1); margin: 0;
}
.modul-merksatz {
  background: linear-gradient(135deg,#FFFBEB,#FEF3C7);
  border-left: 4px solid #F59E0B;
  padding: 14px 18px; border-radius: 12px; margin: 16px 0;
  font-size: 1rem; font-weight: 600; box-shadow: 0 3px 12px rgba(245,158,11,.15);
}
.modul-explanation {
  background: linear-gradient(135deg,#EFF6FF,#DBEAFE);
  border-radius: 12px; padding: 18px 16px; line-height: 1.8; color: #1E3A5F;
  margin-bottom: 16px; font-size: 1rem; border-left: 4px solid #3B82F6;
  box-shadow: 0 3px 12px rgba(59,130,246,.1);
}
.modul-fehler {
  background: linear-gradient(135deg,#FEF2F2,#FEE2E2);
  border-left: 4px solid #EF4444;
  padding: 14px 18px; border-radius: 12px; margin: 12px 0;
  box-shadow: 0 3px 12px rgba(239,68,68,.1);
}
.modul-fehler ul { margin: 8px 0 0 16px; line-height: 1.8; }
.modul-question {
  font-size: 1.1rem; font-weight: 700; color: #1F2937;
  margin: 12px 0 22px; line-height: 1.65;
  background: white; border-radius: 14px; padding: 16px 18px;
  box-shadow: 0 3px 14px rgba(0,0,0,.07); border: 2px solid #EDE9FE;
}
.modul-options { display: flex; flex-direction: column; gap: 12px; margin: 12px 0; }
.modul-option-btn {
  background: white; border: 2.5px solid #DDD6FE;
  color: #3730A3; padding: 14px 18px;
  border-radius: 14px; font-size: 1.05rem; font-weight: 700;
  cursor: pointer; text-align: left; transition: all .18s cubic-bezier(.34,1.56,.64,1);
  box-shadow: 0 2px 10px rgba(124,58,237,.08);
  display: flex; align-items: center; gap: 10px;
  font-family: inherit;
}
.modul-option-btn::before { content: '▶'; font-size: .7rem; color: #A78BFA; opacity: .7; flex-shrink: 0; }
.modul-option-btn:hover {
  background: linear-gradient(135deg,#EDE9FE,#F5F3FF);
  border-color: #7C3AED; color: #4C1D95;
  transform: translateY(-2px) scale(1.01);
  box-shadow: 0 6px 22px rgba(124,58,237,.22);
}
.modul-option-btn:active { transform: scale(.97); }
.modul-diagnose-result { font-size: 2.5rem; font-weight: 900; text-align: center; padding: 16px 0; }
.modul-reflexion-buttons { display: flex; gap: 12px; flex-wrap: nowrap; margin-top: 4px; }
.modul-retry-list { margin: 10px 0 0 18px; color: #B45309; line-height: 1.8; font-weight: 600; }
.modul-hint-text {
  background: linear-gradient(135deg,#ECFDF5,#D1FAE5);
  border-left: 4px solid #10B981; padding: 14px 16px;
  border-radius: 12px; margin: 10px 0; color: #065F46;
  font-size: .95rem; font-weight: 600; box-shadow: 0 2px 10px rgba(16,185,129,.1);
}
.modul-transfer-kontext { font-size: .9rem; color: #6B7280; margin-bottom: 8px; }
.btn-modul-next {
  background: linear-gradient(135deg,#6D28D9,#A855F7);
  color: white; border: none; padding: 16px 28px;
  border-radius: 14px; font-size: 1.1rem; font-weight: 800;
  cursor: pointer; margin-top: 20px; display: block; width: 100%;
  transition: all .2s cubic-bezier(.34,1.56,.64,1);
  box-shadow: 0 5px 22px rgba(109,40,217,.45);
  letter-spacing: .01em; font-family: inherit;
}
.btn-modul-next:hover { transform: translateY(-2px); box-shadow: 0 9px 30px rgba(109,40,217,.55); }
.btn-modul-next:active { transform: scale(.97); }
.btn-modul-hint {
  background: white; color: #374151; border: 2px solid #E5E7EB;
  padding: 12px 18px; border-radius: 12px; font-size: .95rem;
  cursor: pointer; margin-top: 10px; font-weight: 600;
  transition: all .15s; box-shadow: 0 1px 6px rgba(0,0,0,.06);
  font-family: inherit;
}
.btn-modul-hint:hover { background: #F9FAFB; border-color: #C4B5FD; transform: translateY(-1px); }
.modul-btn-row { display: flex; gap: 12px; margin-top: 20px; flex-wrap: wrap; }
.modul-btn-row button { flex: 1; }
.ev-skript-container {
  background: linear-gradient(135deg,#1E1B4B,#2D1B69);
  color: #C4B5FD; padding: 18px 16px; border-radius: 14px;
  font-size: .9rem; line-height: 1.8; white-space: pre-wrap; margin-bottom: 16px;
  box-shadow: 0 4px 20px rgba(109,40,217,.25);
}
.modul-start-btn {
  background: linear-gradient(135deg,#EC4899,#F9A8D4); color: white;
  border: none; padding: 8px 14px; border-radius: 10px; font-size: .85rem;
  font-weight: 700; cursor: pointer; margin-left: 8px;
  transition: all .15s; font-family: inherit;
}
.modul-start-btn:hover { opacity: .9; transform: scale(1.04); }
.modul-celebrate { text-align: center; padding: 12px 0 20px; animation: evFadeUp .4s ease; }
.modul-celebrate-emoji { font-size: 3.8rem; animation: evBounceIn .6s cubic-bezier(.36,.07,.19,.97); }
.modul-celebrate-text { font-size: 1.2rem; font-weight: 800; color: #059669; margin-top: 10px; }
.topic-chapter-header {
  font-weight: 800; font-size: .95rem; color: #7C3AED;
  padding: 10px 4px 4px; margin-top: 8px; border-bottom: 2px solid #EDE9FE;
}

/* ============================================================
   TAFEL (Mathe-Erklärschritte, ersetzt Erklärvideo)
   ============================================================ */
.tafel-topic-btn{
  display:inline-flex;align-items:center;gap:8px;
  background:linear-gradient(135deg,#1E5631,#173E24);
  border:none;color:#F4E9C9;cursor:pointer;padding:6px 12px;border-radius:20px;
  font-family:'Nunito',sans-serif;font-size:12px;font-weight:700;
  transition:transform .15s,box-shadow .15s;box-shadow:0 2px 12px rgba(30,86,49,.4);
}
.tafel-topic-btn:hover{transform:translateY(-1px);box-shadow:0 4px 16px rgba(30,86,49,.5)}

.tafel-overlay{
  position:fixed;inset:0;z-index:9000;background:rgba(0,0,0,.85);
  display:flex;align-items:center;justify-content:center;
  backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);
  animation:evOverlayIn .25s ease;
}
.tafel-overlay.hidden{display:none}

.tafel-board{
  position:relative;width:min(560px,96vw);height:min(680px,92vh);
  background:#1e3d2f;
  border:14px solid #6b4426;
  border-radius:10px;
  display:flex;flex-direction:column;overflow:hidden;
  box-shadow:0 0 0 4px #4a2f1a,0 20px 60px rgba(0,0,0,.6);
}

.tafel-topbar{
  display:flex;align-items:center;justify-content:space-between;
  padding:14px 16px;background:rgba(0,0,0,.15);
}
.tafel-title{
  font-family:'Kalam',cursive;font-size:1.3rem;font-weight:700;color:#F4E9C9;
  text-shadow:0 0 6px rgba(244,233,201,.35);
}
.tafel-close-btn{
  background:rgba(255,255,255,.12);border:none;color:#F4E9C9;
  width:28px;height:28px;border-radius:50%;font-size:12px;cursor:pointer;
  display:flex;align-items:center;justify-content:center;transition:background .2s;
}
.tafel-close-btn:hover{background:rgba(255,255,255,.25)}

.tafel-frame{flex:1;overflow-y:auto;padding:8px 28px 24px}
.tafel-content{display:flex;flex-direction:column;gap:18px}

.tafel-step{
  display:flex;gap:14px;align-items:flex-start;
  font-family:'Kalam',cursive;color:#F4E9C9;font-size:1.15rem;line-height:1.5;
  text-shadow:0 0 4px rgba(244,233,201,.3);
  animation:tafelChalkIn .5s ease both;
}
.tafel-step-num{
  flex-shrink:0;width:30px;height:30px;border-radius:50%;
  border:2px solid #F4E9C9;color:#F4E9C9;
  display:flex;align-items:center;justify-content:center;
  font-family:'Kalam',cursive;font-weight:700;font-size:.95rem;
}
.tafel-step-text{padding-top:3px}

.tafel-controls{
  display:flex;align-items:center;justify-content:space-between;
  padding:12px 20px 18px;background:rgba(0,0,0,.2);
}
.tafel-ctrl-btn{
  background:transparent;border:2px dashed rgba(244,233,201,.6);color:#F4E9C9;
  font-family:'Kalam',cursive;font-size:.95rem;font-weight:700;
  padding:8px 16px;border-radius:10px;cursor:pointer;transition:all .2s;
}
.tafel-ctrl-btn:hover:not(:disabled){background:rgba(244,233,201,.12)}
.tafel-ctrl-btn:disabled{opacity:.35;cursor:default}
.tafel-ctrl-btn-primary{border-style:solid;background:rgba(244,233,201,.12)}

.tafel-progress-dots{display:flex;gap:6px;align-items:center}
.tafel-dot{width:7px;height:7px;border-radius:50%;background:rgba(244,233,201,.3);transition:all .3s}
.tafel-dot.active{background:#F4E9C9;box-shadow:0 0 6px rgba(244,233,201,.7)}

@keyframes tafelChalkIn{
  from{opacity:0;transform:translateY(6px)}
  to{opacity:1;transform:translateY(0)}
}