/* ===================================================
   AVILUS E-LEARNING STUDIO — styles.css
   =================================================== */

/* === DESIGN TOKENS === */
:root {
  --av-dark: #183032;
  --av-olive: #465046;
  --av-green: #52b788;
  --av-green-light: #D8EFDF;
  --av-blue-light: #BAD4D8;
  --av-offwhite: #F7F7F7;
  --av-accent: #52b788;
  --av-accent-dim: rgba(82, 183, 136, 0.12);
  --av-text: #183032;
  --av-text-secondary: #5a6b6d;
  --av-border: #dde5e6;
  --av-card-bg: #ffffff;
  --av-sidebar-bg: #f4f7f7;
  --av-danger: #e74c3c;
  --av-warning: #f39c12;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow-sm: 0 1px 3px rgba(24, 48, 50, 0.08);
  --shadow-md: 0 4px 16px rgba(24, 48, 50, 0.10);
  --shadow-lg: 0 8px 32px rgba(24, 48, 50, 0.14);
  --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

/* === RESET === */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: 'DM Sans', sans-serif;
  background: var(--av-offwhite);
  color: var(--av-text);
  -webkit-font-smoothing: antialiased;
  line-height: 1.7;
}

/* === MODE SWITCHING === */
#viewerMode {
  display: none; position: fixed; inset: 0; z-index: 200;
  background: var(--av-offwhite); /* solid bg prevents creator bleed-through */
}
body.viewer-active { overflow: hidden; }
body.viewer-active #viewerMode { display: block; }


/* =====================================================
   CREATOR
   ===================================================== */

.creator-header {
  background: var(--av-dark);
  padding: 16px 32px;
  display: flex;
  align-items: center;
  gap: 12px;
  position: sticky;
  top: 0;
  z-index: 50;
}
.creator-header .header-logo {
  width: 40px; height: 40px;
  background: var(--av-green);
  border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  font-size: 20px; flex-shrink: 0;
}
.creator-header h1 {
  font-family: 'DM Serif Display', serif;
  color: #fff; font-size: 22px;
}
.creator-header .header-sub {
  color: rgba(255,255,255,0.5); font-size: 11px;
  font-weight: 500; letter-spacing: 0.5px;
  text-transform: uppercase; margin-top: 2px;
}
.creator-header .header-right {
  margin-left: auto;
  display: flex; align-items: center; gap: 8px;
}
.open-json-btn {
  padding: 8px 16px;
  border: 1px solid rgba(255,255,255,0.25);
  border-radius: var(--radius-sm);
  background: rgba(255,255,255,0.07);
  color: rgba(255,255,255,0.8);
  font-family: 'DM Sans', sans-serif;
  font-size: 13px; font-weight: 600;
  cursor: pointer; transition: all var(--transition);
  display: flex; align-items: center; gap: 6px;
}
.open-json-btn:hover { background: rgba(255,255,255,0.15); color: #fff; }

.container { max-width: 900px; margin: 32px auto; padding: 0 24px 64px; }

.step-card {
  background: var(--av-card-bg);
  border: 1px solid var(--av-border);
  border-radius: var(--radius);
  padding: 28px; margin-bottom: 24px;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition);
}
.step-card.disabled { opacity: 0.5; pointer-events: none; }

/* Generation-engine toggle (LLM vs offline NLP) */
.engine-toggle {
  display: flex; align-items: center; flex-wrap: wrap; gap: 10px;
  margin-bottom: 16px;
}
.engine-toggle-label {
  font-size: 13px; font-weight: 600; color: var(--av-text-secondary);
}
.engine-seg {
  display: inline-flex; border: 1px solid var(--av-border);
  border-radius: 10px; overflow: hidden; background: var(--av-bg);
}
.engine-opt {
  border: none; background: transparent; cursor: pointer;
  padding: 7px 14px; font-size: 13px; font-weight: 600;
  color: var(--av-text); transition: background var(--transition), color var(--transition);
}
.engine-opt + .engine-opt { border-left: 1px solid var(--av-border); }
.engine-opt.active { background: var(--av-green); color: #fff; }
.engine-opt.disabled, .engine-opt:disabled {
  opacity: 0.45; cursor: not-allowed;
}
.engine-hint { font-size: 12px; color: var(--av-text-secondary); }

.step-header {
  display: flex; align-items: center;
  gap: 12px; margin-bottom: 16px;
}
.step-num {
  width: 32px; height: 32px; border-radius: 50%;
  background: var(--av-green); color: #fff;
  display: flex; align-items: center; justify-content: center;
  font-size: 14px; font-weight: 700; flex-shrink: 0;
}
.step-header h3 { font-size: 18px; font-weight: 600; color: var(--av-dark); }
.step-status {
  margin-left: auto;
  font-size: 12px; font-weight: 600;
  padding: 4px 12px; border-radius: 20px;
}
.step-status.complete { background: var(--av-green-light); color: var(--av-green); }
.step-status.pending  { background: #fff3cd; color: #856404; }

.upload-zone {
  border: 2px dashed var(--av-border);
  border-radius: var(--radius);
  padding: 48px; text-align: center;
  cursor: pointer; transition: all var(--transition);
}
.upload-zone:hover { border-color: var(--av-green); background: rgba(82,183,136,0.05); }
.upload-zone .upload-icon { font-size: 42px; margin-bottom: 8px; }
.upload-zone p  { font-size: 14px; color: var(--av-text-secondary); }
.upload-zone strong { color: var(--av-text); }

/* Buttons */
.btn {
  padding: 10px 24px;
  border: none; border-radius: var(--radius-sm);
  font-family: 'DM Sans', sans-serif;
  font-size: 14px; font-weight: 600;
  cursor: pointer; transition: all var(--transition);
  display: inline-flex; align-items: center; gap: 6px;
}
.btn-primary   { background: var(--av-green); color: #fff; }
.btn-primary:hover { filter: brightness(1.1); }
.btn-secondary { background: var(--av-offwhite); color: var(--av-text); border: 1px solid var(--av-border); }
.btn-secondary:hover { border-color: var(--av-green); }
.btn-preview   { background: var(--av-accent); color: #fff; border: 2px solid rgba(255,255,255,0.3); }
.btn-preview:hover { background: #fff; color: var(--av-dark); }
.btn:disabled  { opacity: 0.5; cursor: not-allowed; }
.btn-row       { display: flex; gap: 8px; margin-top: 12px; flex-wrap: wrap; }

/* Forms */
textarea {
  width: 100%; min-height: 120px;
  padding: 14px;
  border: 1px solid var(--av-border);
  border-radius: var(--radius-sm);
  font-family: 'DM Sans', sans-serif;
  font-size: 13px; resize: vertical; line-height: 1.6;
}
textarea:focus { outline: none; border-color: var(--av-green); }
input[type="text"] {
  width: 100%; padding: 10px 14px;
  border: 1px solid var(--av-border);
  border-radius: var(--radius-sm);
  font-family: 'DM Sans', sans-serif; font-size: 14px;
}
input[type="text"]:focus { outline: none; border-color: var(--av-green); }

/* Messages */
.success-msg {
  background: var(--av-green-light); color: var(--av-olive);
  padding: 12px 16px; border-radius: var(--radius-sm);
  margin-top: 12px; font-size: 14px; font-weight: 500;
}
.error-msg {
  background: #fde8e8; color: #721c24;
  padding: 12px 16px; border-radius: var(--radius-sm);
  margin-top: 12px; font-size: 14px;
}

/* AI loading state */
.ai-loading {
  display: flex; align-items: center; gap: 14px;
  padding: 20px 24px;
  background: linear-gradient(135deg, rgba(82,183,136,0.06), rgba(82,183,136,0.12));
  border: 1px solid rgba(82,183,136,0.25);
  border-radius: var(--radius); margin-top: 16px;
}
.ai-loading-dots { display: flex; gap: 5px; }
.ai-loading-dots span {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--av-green);
  animation: dotBounce 1.2s ease-in-out infinite;
}
.ai-loading-dots span:nth-child(2) { animation-delay: 0.2s; }
.ai-loading-dots span:nth-child(3) { animation-delay: 0.4s; }
@keyframes dotBounce {
  0%, 80%, 100% { transform: scale(0.7); opacity: 0.5; }
  40%           { transform: scale(1.2); opacity: 1; }
}
.ai-loading-text { font-size: 14px; font-weight: 500; color: var(--av-text-secondary); }
.ai-loading-text strong { color: var(--av-green); }

/* Module list */
.module-list { list-style: none; margin-top: 16px; }
.module-item {
  background: var(--av-offwhite);
  padding: 14px 16px; margin-bottom: 8px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--av-border);
  display: flex; justify-content: space-between; align-items: center;
  transition: all var(--transition);
}
.module-item.done    { border-color: var(--av-green); background: var(--av-green-light); }
.module-item.active  { border-color: var(--av-warning); background: #fffdf0; }
.module-item .mod-info strong { font-size: 14px; }
.module-item .mod-info p { font-size: 12px; color: var(--av-text-secondary); margin-top: 2px; }
.module-item .mod-status { font-size: 18px; }

.progress-bar { width: 100%; height: 6px; background: var(--av-border); border-radius: 6px; margin: 12px 0; }
.progress-bar .fill { height: 100%; background: var(--av-green); border-radius: 6px; transition: width var(--transition); }

/* Export card */
.export-card {
  background: linear-gradient(135deg, var(--av-dark), #1f4446);
  border-radius: var(--radius); padding: 32px;
  color: #fff; text-align: center; margin-top: 24px;
}
.export-card h3 { font-family: 'DM Serif Display', serif; font-size: 24px; margin-bottom: 8px; }
.export-card p  { color: rgba(255,255,255,0.7); font-size: 14px; margin-bottom: 24px; }
.export-btns    { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }
.export-btns .btn { padding: 14px 28px; font-size: 15px; }

.hidden     { display: none !important; }
.info-box   {
  background: rgba(82,183,136,0.08);
  border: 1px solid rgba(82,183,136,0.2);
  border-radius: var(--radius-sm);
  padding: 14px 16px; margin-bottom: 20px;
  font-size: 13px; color: var(--av-text-secondary); line-height: 1.6;
}
.info-box strong { color: var(--av-text); }


/* =====================================================
   VIEWER
   ===================================================== */

.app-shell { display: flex; height: 100vh; overflow: hidden; }

/* Sidebar */
.sidebar {
  width: 300px; min-width: 300px;
  background: var(--av-dark); color: #fff;
  display: flex; flex-direction: column;
  overflow: hidden;
  transition: width var(--transition), min-width var(--transition);
  z-index: 20;
}
.sidebar.collapsed { width: 0; min-width: 0; }
.sidebar-header {
  padding: 24px 20px 16px;
  border-bottom: 1px solid rgba(255,255,255,0.08);
  flex-shrink: 0;
}
.sidebar-logo {
  font-family: 'DM Serif Display', serif;
  font-size: 22px; letter-spacing: -0.5px;
  display: flex; align-items: center; gap: 10px;
}
.sidebar-logo .logo-icon {
  width: 36px; height: 36px;
  background: var(--av-green); border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  font-size: 18px;
}
.sidebar-subtitle {
  font-size: 12px; color: rgba(255,255,255,0.45);
  margin-top: 4px; font-weight: 500;
  letter-spacing: 0.5px; text-transform: uppercase;
}
.course-title-side {
  padding: 16px 20px;
  font-size: 13px; font-weight: 600;
  color: var(--av-green);
  border-bottom: 1px solid rgba(255,255,255,0.06);
}
.module-nav { flex: 1; overflow-y: auto; padding: 8px 0; }
.module-nav::-webkit-scrollbar { width: 4px; }
.module-nav::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.15); border-radius: 4px; }
.module-nav-item {
  padding: 12px 20px; cursor: pointer;
  border-left: 3px solid transparent;
  transition: all var(--transition);
  display: flex; align-items: flex-start; gap: 12px;
}
.module-nav-item:hover { background: rgba(255,255,255,0.05); }
.module-nav-item.active { background: rgba(82,183,136,0.10); border-left-color: var(--av-green); }
.module-nav-num {
  width: 26px; height: 26px; border-radius: 50%;
  background: rgba(255,255,255,0.08);
  display: flex; align-items: center; justify-content: center;
  font-size: 12px; font-weight: 700;
  flex-shrink: 0; margin-top: 1px;
  transition: all var(--transition);
}
.module-nav-item.active .module-nav-num,
.module-nav-item.done   .module-nav-num { background: var(--av-green); color: #fff; }
.module-nav-text {
  font-size: 13px; font-weight: 500;
  color: rgba(255,255,255,0.7); line-height: 1.4;
}
.module-nav-item.active .module-nav-text { color: #fff; }
.module-nav-dur { font-size: 11px; color: rgba(255,255,255,0.35); margin-top: 2px; }

/* Topbar */
.main-area { flex: 1; display: flex; flex-direction: column; overflow: hidden; min-width: 0; }
.topbar {
  height: 56px;
  background: var(--av-card-bg);
  border-bottom: 1px solid var(--av-border);
  display: flex; align-items: center;
  padding: 0 24px; gap: 12px;
  flex-shrink: 0; z-index: 10;
}
.topbar-toggle {
  width: 36px; height: 36px; border: none;
  background: var(--av-sidebar-bg); border-radius: var(--radius-sm);
  cursor: pointer; display: flex; align-items: center; justify-content: center;
  font-size: 18px; color: var(--av-text); transition: all var(--transition);
}
.topbar-toggle:hover { background: var(--av-accent-dim); color: var(--av-green); }
.view-tabs {
  display: flex; gap: 4px;
  background: var(--av-sidebar-bg);
  padding: 4px; border-radius: var(--radius-sm);
}
.view-tab {
  padding: 7px 16px; border: none; background: none;
  border-radius: 6px; cursor: pointer;
  font-family: 'DM Sans', sans-serif;
  font-size: 13px; font-weight: 500;
  color: var(--av-text-secondary);
  transition: all var(--transition);
  display: flex; align-items: center; gap: 6px; white-space: nowrap;
}
.view-tab:hover { color: var(--av-text); }
.view-tab.active { background: var(--av-card-bg); color: var(--av-green); box-shadow: var(--shadow-sm); font-weight: 600; }
.topbar-right { margin-left: auto; display: flex; align-items: center; gap: 10px; }
.progress-pill {
  font-size: 12px; font-weight: 600;
  color: var(--av-green); background: var(--av-accent-dim);
  padding: 5px 14px; border-radius: 20px;
}
.back-to-studio-btn {
  padding: 6px 14px;
  border: 1px solid var(--av-border); border-radius: var(--radius-sm);
  background: var(--av-sidebar-bg);
  color: var(--av-text-secondary);
  font-family: 'DM Sans', sans-serif;
  font-size: 12px; font-weight: 600; cursor: pointer;
  display: flex; align-items: center; gap: 5px;
  transition: all var(--transition);
}
.back-to-studio-btn:hover { background: var(--av-accent-dim); color: var(--av-green); border-color: var(--av-green); }

/* Content panels */
.content-viewport { flex: 1; overflow-y: auto; overflow-x: hidden; }
.content-viewport::-webkit-scrollbar { width: 6px; }
.content-viewport::-webkit-scrollbar-thumb { background: var(--av-border); border-radius: 6px; }
.view-panel { display: none; }
.view-panel.active { display: block; }

/* Immersive layout */
.immersive-layout { display: flex; max-width: 1200px; margin: 0 auto; }
.section-nav {
  width: 220px; min-width: 220px;
  padding: 32px 0 32px 24px;
  position: sticky; top: 0;
  height: fit-content;
  max-height: calc(100vh - 56px);
  overflow-y: auto;
}
.section-nav::-webkit-scrollbar { width: 3px; }
.section-nav::-webkit-scrollbar-thumb { background: var(--av-border); border-radius: 3px; }
.section-nav-title {
  font-size: 11px; font-weight: 700;
  text-transform: uppercase; letter-spacing: 1px;
  color: var(--av-text-secondary);
  margin-bottom: 16px; padding-left: 12px;
}
.section-link {
  display: block; padding: 8px 12px;
  font-size: 13px; color: var(--av-text-secondary);
  text-decoration: none;
  border-left: 2px solid transparent;
  transition: all var(--transition);
  cursor: pointer; line-height: 1.4;
}
.section-link:hover  { color: var(--av-text); border-left-color: var(--av-border); }
.section-link.active { color: var(--av-green); border-left-color: var(--av-green); font-weight: 600; }

.article-body { flex: 1; max-width: 860px; padding: 40px 48px; min-width: 0; }
.module-hero { margin-bottom: 40px; padding-bottom: 32px; border-bottom: 1px solid var(--av-border); }
.module-hero .module-num {
  font-size: 12px; font-weight: 700;
  letter-spacing: 1.5px; text-transform: uppercase;
  color: var(--av-green); margin-bottom: 8px;
}
.module-hero h1 {
  font-family: 'DM Serif Display', serif;
  font-size: 36px; line-height: 1.2;
  color: var(--av-dark); margin-bottom: 12px;
}
.module-hero .hero-duration {
  font-size: 13px; color: var(--av-text-secondary);
  display: flex; align-items: center; gap: 6px;
}
.module-intro {
  font-size: 16px; color: var(--av-text-secondary);
  line-height: 1.8; margin-bottom: 32px;
  padding: 20px 24px;
  background: var(--av-accent-dim);
  border-radius: var(--radius);
  border-left: 4px solid var(--av-green);
}
.module-intro .intro-label {
  font-size: 12px; font-weight: 700;
  text-transform: uppercase; letter-spacing: 1px;
  color: var(--av-green); margin-bottom: 8px;
}
.content-section { margin-bottom: 48px; scroll-margin-top: 24px; }
.content-section h2 {
  font-family: 'DM Serif Display', serif;
  font-size: 24px; color: var(--av-dark);
  margin-bottom: 16px; line-height: 1.3;
}
.content-section .section-text { font-size: 16px; line-height: 1.85; color: var(--av-text); }
.content-section .section-text p { margin-bottom: 16px; }
.fmt-bullets {
  list-style: none; padding: 0; margin: 4px 0 16px 0;
  display: flex; flex-direction: column; gap: 10px;
}
.fmt-bullets li {
  padding-left: 22px; position: relative;
  font-size: 16px; line-height: 1.7; color: var(--av-text);
}
.fmt-bullets li::before {
  content: '\2022'; position: absolute; left: 0; top: 0;
  color: var(--av-green); font-weight: 700; font-size: 18px; line-height: 1.55;
}

/* Diagram cards */
.diagram-card {
  margin: 24px 0; background: var(--av-card-bg);
  border: 1px solid var(--av-border); border-radius: var(--radius);
  overflow: hidden; box-shadow: var(--shadow-sm);
}
.diagram-card .diagram-header {
  padding: 10px 16px; background: var(--av-sidebar-bg);
  font-size: 12px; font-weight: 600;
  color: var(--av-text-secondary);
  text-transform: uppercase; letter-spacing: 0.5px;
  display: flex; align-items: center; gap: 6px;
}
.diagram-card svg { display: block; width: 100%; height: auto; }

/* Inline quiz */
.quiz-trigger {
  display: inline-flex; align-items: center; gap: 4px;
  background: var(--av-warning); color: #fff; border: none;
  padding: 3px 10px; border-radius: 20px;
  font-size: 12px; font-weight: 700; cursor: pointer;
  margin-left: 6px; vertical-align: middle;
  transition: all var(--transition);
  font-family: 'DM Sans', sans-serif;
}
.quiz-trigger:hover { transform: scale(1.05); filter: brightness(1.1); }
.quiz-panel {
  margin: 20px 0;
  background: linear-gradient(135deg, #fff9e6, #fff5d6);
  border: 2px solid var(--av-warning);
  border-radius: var(--radius); padding: 24px;
  display: none; animation: quizSlide 0.3s ease;
}
.quiz-panel.open { display: block; }
@keyframes quizSlide {
  from { opacity: 0; transform: translateY(-8px); }
  to   { opacity: 1; transform: translateY(0); }
}
.quiz-panel .quiz-q { font-size: 15px; font-weight: 600; color: var(--av-text); margin-bottom: 16px; }

/* Quiz options (shared immersive + quiz view + slides) */
.quiz-option {
  display: block; width: 100%; text-align: left;
  padding: 12px 16px; margin-bottom: 8px;
  border: 2px solid var(--av-border); border-radius: var(--radius-sm);
  background: #fff; cursor: pointer;
  font-family: 'DM Sans', sans-serif;
  font-size: 14px; line-height: 1.5; color: var(--av-text);
  transition: all var(--transition);
}
.quiz-option:hover   { border-color: var(--av-green); background: var(--av-accent-dim); }
.quiz-option.correct { border-color: var(--av-green); background: var(--av-green-light); color: var(--av-dark); }
.quiz-option.wrong   { border-color: var(--av-danger); background: #fde8e8; }
.quiz-option.disabled { pointer-events: none; opacity: 0.6; }

.quiz-explanation {
  margin-top: 16px; padding: 12px 16px;
  border-radius: var(--radius-sm);
  font-size: 14px; line-height: 1.6; display: none;
}
.quiz-explanation.correct-expl { background: var(--av-green-light); border-left: 3px solid var(--av-green); display: block; }
.quiz-explanation.wrong-expl   { background: #fde8e8; border-left: 3px solid var(--av-danger); display: block; }

/* Concepts sidebar */
.concepts-sidebar {
  width: 220px; min-width: 220px;
  padding: 32px 24px 32px 0;
  position: sticky; top: 0;
  height: fit-content;
  max-height: calc(100vh - 56px); overflow-y: auto;
}
.concepts-sidebar::-webkit-scrollbar { width: 3px; }
.concepts-sidebar::-webkit-scrollbar-thumb { background: var(--av-border); border-radius: 3px; }
.concept-card {
  background: var(--av-card-bg); border: 1px solid var(--av-border);
  border-radius: var(--radius-sm); padding: 14px; margin-bottom: 12px;
  transition: all var(--transition);
}
.concept-card:hover { box-shadow: var(--shadow-sm); border-color: var(--av-green); }
.concept-term { font-size: 13px; font-weight: 700; color: var(--av-green); margin-bottom: 4px; }
.concept-def  { font-size: 12px; color: var(--av-text-secondary); line-height: 1.5; }

/* Section hero image — AI-generated, shown above section text */
.section-hero {
  margin: 0 0 20px;
  border-radius: var(--radius);
  overflow: hidden;
  line-height: 0;
}
.section-hero-img {
  width: 100%; aspect-ratio: 16/5;
  object-fit: cover; object-position: center;
  display: block;
}

/* Cinematic AI image replacing SVG visual */
.cin-slide-img {
  width: 100%; height: 100%;
  object-fit: cover; object-position: center;
  border-radius: 12px;
}

/* Key Concepts — inline bullet list (replaces sidebar boxes) */
.kc-section {
  margin: 28px 0 8px;
  padding: 20px 24px;
  background: var(--av-card-bg);
  border: 1px solid var(--av-border);
  border-left: 4px solid var(--av-green);
  border-radius: var(--radius);
}
.kc-section-title {
  font-size: 12px; font-weight: 700; letter-spacing: 0.5px;
  color: var(--av-green); text-transform: uppercase; margin-bottom: 14px;
}
.kc-bullet {
  display: flex; gap: 0; align-items: baseline;
  padding: 6px 0 6px 20px; position: relative;
  font-size: 14px; line-height: 1.6;
}
.kc-bullet::before {
  content: '•'; position: absolute; left: 4px;
  color: var(--av-green); font-size: 16px; line-height: 1.4;
}
.kc-bullet:last-child { padding-bottom: 0; }
.kc-term { font-weight: 700; color: var(--av-text); flex-shrink: 0; margin-right: 6px; }
.kc-sep  { color: var(--av-text-secondary); flex-shrink: 0; margin-right: 6px; }
.kc-def  { color: var(--av-text-secondary); }
/* Sidebar always hidden — concepts are inline in article body */
.concepts-sidebar { display: none !important; }

/* Output options panel in Step 3 */
.output-options {
  margin: 16px 0 20px;
  padding: 16px 18px;
  background: var(--av-card-bg);
  border: 1px solid var(--av-border);
  border-radius: var(--radius);
}
.oo-title {
  font-size: 13px; font-weight: 700; color: var(--av-text);
  margin-bottom: 12px; display: flex; align-items: center; gap: 8px; flex-wrap: wrap;
}
.oo-hint { font-size: 11px; font-weight: 400; color: var(--av-text-secondary); }
.oo-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 8px 16px;
}
.oo-item {
  display: flex; align-items: center; gap: 8px;
  cursor: pointer; user-select: none;
}
.oo-item input[type="checkbox"] {
  width: 16px; height: 16px; accent-color: var(--av-green);
  cursor: pointer; flex-shrink: 0;
}
.oo-label { font-size: 13px; color: var(--av-text); display: flex; align-items: center; gap: 6px; }
.oo-tag {
  font-size: 9px; font-weight: 700; padding: 2px 6px;
  border-radius: 10px; letter-spacing: 0.3px; white-space: nowrap;
}
.oo-tag.always   { background: rgba(82,183,136,0.15); color: var(--av-green); }
.oo-tag.expensive { background: rgba(232,168,56,0.15); color: #c8841a; }

/* Application card */
.application-card {
  margin: 32px 0;
  background: linear-gradient(135deg, var(--av-dark), #1f4446);
  color: #fff; border-radius: var(--radius);
  padding: 32px; position: relative; overflow: hidden;
}
.application-card::before {
  content: ''; position: absolute; top: -40px; right: -40px;
  width: 160px; height: 160px;
  background: rgba(82,183,136,0.15); border-radius: 50%;
}
.application-card .app-label {
  font-size: 12px; font-weight: 700;
  text-transform: uppercase; letter-spacing: 1.5px;
  color: var(--av-green); margin-bottom: 12px;
}
.application-card h3 { font-family: 'DM Serif Display', serif; font-size: 20px; margin-bottom: 16px; }
.application-card p  { font-size: 15px; line-height: 1.7; color: rgba(255,255,255,0.85); }

/* Worked Examples — immersive view */
.we-section { margin-top: 24px; padding-top: 20px; border-top: 1px solid rgba(255,255,255,0.15); }
.we-section h3 { font-family: 'DM Serif Display', serif; font-size: 20px; margin-bottom: 16px; }
.worked-example {
  display: flex; gap: 16px; align-items: flex-start;
  background: rgba(255,255,255,0.06); border-radius: 12px;
  padding: 16px 18px; margin-bottom: 12px;
}
.we-number {
  min-width: 32px; height: 32px; border-radius: 50%;
  background: var(--av-green); color: #fff;
  font-size: 13px; font-weight: 800; display: flex;
  align-items: center; justify-content: center; flex-shrink: 0;
}
.we-title { font-weight: 700; font-size: 14px; color: #fff; margin-bottom: 10px; }
.we-row { display: flex; gap: 10px; font-size: 13px; margin-bottom: 6px; line-height: 1.5; }
.we-label { color: var(--av-green); font-weight: 700; min-width: 70px; flex-shrink: 0; }

/* Worked Examples — cinematic slide */
.cin-we-layout {
  height: 100%; display: grid;
  grid-template-rows: auto 1fr; grid-template-columns: 1fr auto;
  gap: 16px; padding: 28px 32px; position: relative;
}
.cin-we-header {
  grid-column: 1; display: flex; align-items: center; gap: 14px;
}
.cin-we-badge {
  background: var(--av-green); color: #fff; font-size: 11px;
  font-weight: 800; padding: 4px 12px; border-radius: 20px; white-space: nowrap;
}
.cin-we-title { font-size: 20px; font-weight: 700; color: var(--av-text); }
.cin-we-steps { grid-column: 1; display: flex; flex-direction: column; gap: 14px; }
.cin-we-step {
  display: flex; gap: 14px; align-items: flex-start;
  background: var(--av-card-bg); border-radius: 12px;
  padding: 14px 18px; border: 1px solid var(--av-border);
}
.cin-we-step-icon { font-size: 20px; flex-shrink: 0; line-height: 1; }
.cin-we-step-label { font-size: 10px; font-weight: 700; color: var(--av-green); margin-bottom: 4px; letter-spacing: 0.5px; text-transform: uppercase; }
.cin-we-step-text { font-size: 14px; line-height: 1.5; color: var(--av-text); }
@media (max-width: 760px) {
  .cin-we-layout { padding: 18px 16px; }
  .cin-we-title { font-size: 16px; }
  .cin-we-step-text { font-size: 13px; }
}

/* Slides view */
.slides-container {
  height: calc(100vh - 56px);
  display: flex; flex-direction: column;
  background: var(--av-dark);
}
.slide-viewport {
  flex: 1; display: flex;
  align-items: center; justify-content: center;
  padding: 40px; overflow: hidden;
}
.slide-card {
  background: var(--av-card-bg); border-radius: 16px;
  max-width: 900px; width: 100%; min-height: 480px;
  padding: 56px; box-shadow: var(--shadow-lg);
  position: relative; animation: slideIn 0.4s ease;
}
@keyframes slideIn {
  from { opacity: 0; transform: scale(0.96) translateY(12px); }
  to   { opacity: 1; transform: scale(1) translateY(0); }
}
.slide-card .slide-num {
  position: absolute; top: 20px; right: 24px;
  font-size: 12px; font-weight: 700; color: var(--av-text-secondary);
}
.slide-card .slide-module-tag {
  font-size: 11px; font-weight: 700;
  text-transform: uppercase; letter-spacing: 1.5px;
  color: var(--av-green); margin-bottom: 12px;
}
.slide-card h2 {
  font-family: 'DM Serif Display', serif;
  font-size: 32px; color: var(--av-dark);
  margin-bottom: 20px; line-height: 1.25;
}
.slide-card .slide-content { font-size: 18px; line-height: 1.8; color: var(--av-text); }
.fill-blank {
  display: inline-block; min-width: 100px;
  border-bottom: 3px dashed var(--av-green);
  padding: 2px 8px; margin: 0 4px;
  color: var(--av-green); font-weight: 700; cursor: pointer;
  transition: all var(--transition);
}
.fill-blank.revealed { border-bottom-style: solid; background: var(--av-accent-dim); border-radius: 4px; }
.fill-blank:not(.revealed) .blank-text     { visibility: hidden; }
.fill-blank:not(.revealed)::after { content: 'tap to reveal'; font-size: 11px; color: var(--av-text-secondary); font-weight: 500; }

/* Slide controls bar */
.slide-controls {
  padding: 16px 40px;
  display: flex; align-items: center; gap: 12px;
  background: rgba(24,48,50,0.95);
  border-top: 1px solid rgba(255,255,255,0.06);
}
.slide-btn {
  width: 44px; height: 44px; border: none; border-radius: 50%;
  background: rgba(255,255,255,0.1); color: #fff; cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  font-size: 20px; transition: all var(--transition);
}
.slide-btn:hover { background: var(--av-green); }
.slide-btn:disabled { opacity: 0.3; cursor: not-allowed; }
.slide-btn:disabled:hover { background: rgba(255,255,255,0.1); }
.slide-progress-bar {
  flex: 1; height: 4px;
  background: rgba(255,255,255,0.1);
  border-radius: 4px; cursor: pointer;
}
.slide-progress-fill { height: 100%; background: var(--av-green); border-radius: 4px; transition: width var(--transition); }
.slide-counter { font-size: 13px; color: rgba(255,255,255,0.6); font-weight: 600; min-width: 60px; text-align: center; }
.narration-controls {
  display: flex; align-items: center; gap: 8px;
  margin-left: 16px; padding-left: 16px;
  border-left: 1px solid rgba(255,255,255,0.1);
}
.narration-btn {
  padding: 6px 14px;
  border: 1px solid rgba(255,255,255,0.2); border-radius: 20px;
  background: none; color: #fff; cursor: pointer;
  font-family: 'DM Sans', sans-serif; font-size: 12px; font-weight: 600;
  display: flex; align-items: center; gap: 5px; transition: all var(--transition);
}
.narration-btn:hover { background: rgba(255,255,255,0.1); }
.narration-btn.active { background: var(--av-green); border-color: var(--av-green); }
.narration-btn.upload-btn { border-style: dashed; }
.audio-indicator { display: flex; align-items: center; gap: 3px; height: 24px; }
.audio-bar {
  width: 3px; background: var(--av-green); border-radius: 2px;
  animation: audioWave 1s ease-in-out infinite;
}
.audio-bar:nth-child(1) { height: 8px;  animation-delay: 0s; }
.audio-bar:nth-child(2) { height: 16px; animation-delay: 0.1s; }
.audio-bar:nth-child(3) { height: 12px; animation-delay: 0.2s; }
.audio-bar:nth-child(4) { height: 20px; animation-delay: 0.15s; }
.audio-bar:nth-child(5) { height: 10px; animation-delay: 0.25s; }
@keyframes audioWave {
  0%, 100% { transform: scaleY(0.5); }
  50%       { transform: scaleY(1.2); }
}
.audio-indicator.paused .audio-bar { animation-play-state: paused; }

/* Quiz full view */
.quiz-view { max-width: 760px; margin: 0 auto; padding: 40px 24px; }
.quiz-view h2 { font-family: 'DM Serif Display', serif; font-size: 28px; margin-bottom: 8px; }
.quiz-view .quiz-subtitle { color: var(--av-text-secondary); margin-bottom: 32px; font-size: 15px; }
.quiz-card-full {
  background: var(--av-card-bg); border: 1px solid var(--av-border);
  border-radius: var(--radius); padding: 28px; margin-bottom: 24px;
  box-shadow: var(--shadow-sm);
}
.quiz-card-full .qnum {
  font-size: 12px; font-weight: 700; color: var(--av-green);
  text-transform: uppercase; letter-spacing: 1px; margin-bottom: 10px;
}

/* Voiceover modal */
.voiceover-modal {
  display: none; position: fixed; inset: 0;
  background: rgba(24,48,50,0.6); backdrop-filter: blur(8px);
  z-index: 300; align-items: center; justify-content: center;
}
.voiceover-modal.open { display: flex; }
.vo-modal-body {
  background: var(--av-card-bg); border-radius: 16px;
  width: 600px; max-width: 90vw; max-height: 85vh;
  overflow-y: auto; box-shadow: var(--shadow-lg);
}
.vo-modal-header {
  padding: 24px 28px; border-bottom: 1px solid var(--av-border);
  display: flex; align-items: center; justify-content: space-between;
}
.vo-modal-header h3 { font-family: 'DM Serif Display', serif; font-size: 22px; }
.vo-close {
  width: 36px; height: 36px; border: none;
  background: var(--av-sidebar-bg); border-radius: 50%;
  cursor: pointer; font-size: 18px;
  display: flex; align-items: center; justify-content: center;
  transition: all var(--transition);
}
.vo-close:hover { background: #fde8e8; color: var(--av-danger); }
.vo-modal-content { padding: 28px; }
.vo-source-toggle { display: flex; gap: 8px; margin-bottom: 20px; }
.vo-source-btn {
  flex: 1; padding: 10px;
  border: 2px solid var(--av-border); border-radius: var(--radius-sm);
  background: none; cursor: pointer;
  font-family: 'DM Sans', sans-serif; font-weight: 600;
  font-size: 13px; text-align: center;
  transition: all var(--transition); color: var(--av-text-secondary);
}
.vo-source-btn.active { border-color: var(--av-green); background: var(--av-accent-dim); color: var(--av-green); }
.vo-upload-zone {
  border: 2px dashed var(--av-border); border-radius: var(--radius);
  padding: 40px; text-align: center; cursor: pointer;
  transition: all var(--transition); margin-bottom: 20px;
}
.vo-upload-zone:hover { border-color: var(--av-green); background: var(--av-accent-dim); }
.vo-upload-zone .upload-icon { font-size: 40px; margin-bottom: 8px; }
.vo-upload-zone p      { font-size: 14px; color: var(--av-text-secondary); }
.vo-upload-zone strong { color: var(--av-text); }
.vo-timing-row { display: flex; align-items: center; gap: 12px; padding: 10px 0; border-bottom: 1px solid var(--av-border); }
.vo-timing-row label { flex: 1; font-size: 13px; font-weight: 500; }
.vo-timing-input {
  width: 80px; padding: 6px 10px;
  border: 1px solid var(--av-border); border-radius: 6px;
  font-family: monospace; font-size: 13px; text-align: center;
}
.vo-timing-input:focus { outline: none; border-color: var(--av-green); }
.vo-save-btn {
  width: 100%; padding: 12px; border: none; border-radius: var(--radius-sm);
  background: var(--av-green); color: #fff;
  font-family: 'DM Sans', sans-serif; font-size: 15px; font-weight: 600;
  cursor: pointer; margin-top: 20px; transition: all var(--transition);
}
.vo-save-btn:hover { filter: brightness(1.1); }
.tts-section label { font-size: 13px; font-weight: 600; display: block; margin-bottom: 8px; }
.tts-section select,
.tts-section input[type="range"] {
  width: 100%; padding: 8px;
  border: 1px solid var(--av-border); border-radius: 6px;
  font-family: 'DM Sans', sans-serif; font-size: 13px; margin-bottom: 12px;
}

/* Viewer splash */
.splash-screen {
  display: flex; align-items: center; justify-content: center;
  height: 100vh;
  background: linear-gradient(160deg, var(--av-dark) 0%, #1c3e40 50%, var(--av-olive) 100%);
}
.splash-card {
  background: var(--av-card-bg); border-radius: 20px;
  padding: 56px; max-width: 520px; width: 90%;
  box-shadow: var(--shadow-lg); text-align: center;
}
.splash-card .splash-logo {
  width: 64px; height: 64px; background: var(--av-green); border-radius: 16px;
  display: flex; align-items: center; justify-content: center;
  font-size: 30px; margin: 0 auto 24px;
}
.splash-card h1 { font-family: 'DM Serif Display', serif; font-size: 28px; margin-bottom: 8px; color: var(--av-dark); }
.splash-card .splash-sub { color: var(--av-text-secondary); margin-bottom: 32px; font-size: 15px; }
.splash-upload {
  border: 2px dashed var(--av-border); border-radius: var(--radius);
  padding: 48px 32px; cursor: pointer;
  transition: all var(--transition); margin-bottom: 16px;
}
.splash-upload:hover { border-color: var(--av-green); background: var(--av-accent-dim); }
.splash-upload .upload-big-icon { font-size: 48px; margin-bottom: 12px; }
.splash-upload p      { color: var(--av-text-secondary); font-size: 14px; }
.splash-upload strong { color: var(--av-text); }
.splash-note { font-size: 12px; color: var(--av-text-secondary); }
.splash-back-btn {
  margin-top: 20px; padding: 10px 24px;
  border: 1px solid var(--av-border); border-radius: var(--radius-sm);
  background: none; font-family: 'DM Sans', sans-serif;
  font-size: 14px; font-weight: 600; cursor: pointer;
  color: var(--av-text-secondary); transition: all var(--transition);
}
.splash-back-btn:hover { color: var(--av-green); border-color: var(--av-green); }

/* =====================================================
   RESPONSIVE
   ===================================================== */
@media (max-width: 1100px) {
  .section-nav, .concepts-sidebar { display: none; }
  .article-body { max-width: 100%; padding: 32px 24px; }
}
@media (max-width: 768px) {
  .sidebar { position: fixed; height: 100%; }
  .sidebar:not(.collapsed) { width: 280px; min-width: 280px; }
  .slide-card { padding: 32px; min-height: 360px; }
  .slide-card h2 { font-size: 24px; }
  .slide-card .slide-content { font-size: 16px; }
  .view-tab .tab-label { display: none; }
  .narration-controls .narration-btn span { display: none; }
  .container { padding: 0 16px 64px; }
}

/* =====================================================
   ENHANCED SLIDES — Google Learn-Your-Way inspired
   ===================================================== */

/* Slide card base — tighter padding for two-col layout */
.slide-card {
  padding: 40px 44px !important;
  display: flex;
  flex-direction: column;
}
.slide-card .slide-num {
  position: absolute; top: 16px; right: 20px;
  font-size: 11px; font-weight: 700;
  color: var(--av-text-secondary);
  background: var(--av-sidebar-bg);
  padding: 3px 10px; border-radius: 20px;
}

/* ── Title slide ────────────────────────────────────── */
.slide-title-wrap {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 24px;
  align-items: center;
  height: 100%;
  min-height: 380px;
}
.slide-title-left { display: flex; flex-direction: column; gap: 14px; }
.slide-module-badge {
  display: inline-flex; align-items: center;
  font-size: 10px; font-weight: 800;
  letter-spacing: 2px; text-transform: uppercase;
  color: #fff; background: var(--av-green);
  padding: 4px 14px; border-radius: 20px;
  width: fit-content;
}
.slide-title-main {
  font-family: 'DM Serif Display', serif;
  font-size: 38px; line-height: 1.15;
  color: var(--av-dark); margin: 0;
}
.slide-title-sub {
  font-size: 16px; color: var(--av-text-secondary);
  line-height: 1.7; max-width: 520px;
}
.slide-title-dur {
  font-size: 13px; color: var(--av-text-secondary);
  display: flex; align-items: center; gap: 6px;
  padding: 6px 14px; background: var(--av-sidebar-bg);
  border-radius: 20px; width: fit-content;
}
.slide-title-visual {
  width: 220px; height: 220px; flex-shrink: 0;
}

/* ── Content slide ──────────────────────────────────── */
.slide-content-wrap {
  display: grid;
  grid-template-columns: 1fr 240px;
  gap: 32px;
  align-items: center;
  flex: 1;
}
.slide-content-left { display: flex; flex-direction: column; gap: 16px; }
.slide-tag {
  font-size: 10px; font-weight: 800;
  letter-spacing: 2px; text-transform: uppercase;
  color: var(--av-green);
}
.slide-heading {
  font-family: 'DM Serif Display', serif;
  font-size: 26px; line-height: 1.25;
  color: var(--av-dark); margin: 0;
}
.slide-bullets {
  list-style: none; padding: 0; margin: 0;
  display: flex; flex-direction: column; gap: 11px;
}
.slide-bullets li {
  font-size: 15px; line-height: 1.55;
  color: var(--av-text);
  padding-left: 22px; position: relative;
}
.slide-bullets li::before {
  content: '';
  position: absolute; left: 0; top: 8px;
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--av-green);
}
.key-term {
  color: var(--av-green); font-weight: 700;
}
.slide-visual-wrap {
  display: flex; align-items: center; justify-content: center;
}
.slide-visual-svg { width: 100%; height: auto; }

/* ── Concepts slide ─────────────────────────────────── */
.slide-concepts-wrap { flex: 1; display: flex; flex-direction: column; gap: 16px; }
.slide-concepts-heading {
  font-family: 'DM Serif Display', serif;
  font-size: 24px; color: var(--av-dark);
}
.slide-concepts-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}
.slide-concept-card {
  background: var(--av-sidebar-bg);
  border: 1px solid var(--av-border);
  border-radius: 10px; padding: 14px;
  border-top: 3px solid var(--av-green);
}
.slide-concept-term {
  font-size: 12px; font-weight: 800;
  text-transform: uppercase; letter-spacing: 1px;
  color: var(--av-green); margin-bottom: 5px;
}
.slide-concept-def {
  font-size: 13px; line-height: 1.5;
  color: var(--av-text-secondary);
}

/* ── Quiz slide ─────────────────────────────────────── */
.slide-quiz-wrap { flex: 1; display: flex; flex-direction: column; gap: 20px; }
.slide-quiz-badge {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 10px; font-weight: 800;
  letter-spacing: 2px; text-transform: uppercase;
  color: var(--av-warning);
  background: rgba(243,156,18,0.10);
  border: 1px solid rgba(243,156,18,0.25);
  padding: 4px 12px; border-radius: 20px;
  width: fit-content;
}
.slide-quiz-question {
  font-family: 'DM Serif Display', serif;
  font-size: 22px; line-height: 1.35; color: var(--av-dark);
}
.slide-quiz-options { display: flex; flex-direction: column; gap: 9px; }

/* ── Application slide ──────────────────────────────── */
.slide-app-wrap {
  flex: 1; display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px; align-items: stretch;
}
.slide-app-scenario {
  background: var(--av-dark); color: #fff;
  border-radius: 14px; padding: 24px;
  display: flex; flex-direction: column; gap: 12px;
}
.slide-app-label {
  font-size: 10px; font-weight: 800;
  letter-spacing: 2px; text-transform: uppercase;
  color: var(--av-green);
}
.slide-app-scenario h3 {
  font-family: 'DM Serif Display', serif;
  font-size: 18px; color: #fff;
}
.slide-app-scenario p { font-size: 14px; line-height: 1.65; color: rgba(255,255,255,0.8); }
.slide-app-guidance {
  background: var(--av-accent-dim);
  border: 1px solid rgba(82,183,136,0.25);
  border-radius: 14px; padding: 24px;
  display: flex; flex-direction: column; gap: 12px;
}
.slide-app-guidance h3 {
  font-family: 'DM Serif Display', serif;
  font-size: 18px; color: var(--av-dark);
}
.slide-app-guidance p { font-size: 14px; line-height: 1.65; color: var(--av-text-secondary); }

/* Responsive */
@media (max-width: 768px) {
  .slide-content-wrap, .slide-title-wrap, .slide-app-wrap {
    grid-template-columns: 1fr;
  }
  .slide-title-visual, .slide-visual-wrap { display: none; }
  .slide-concepts-grid { grid-template-columns: 1fr; }
}

/* =====================================================
   VIDEO SCRIPT MODAL
   ===================================================== */
.btn-video {
  background: linear-gradient(135deg, #8b5cf6, #6d28d9);
  color: #fff;
  border: none;
}
.btn-video:hover { filter: brightness(1.15); }

.vs-overlay {
  display: none; position: fixed; inset: 0;
  background: rgba(24,48,50,0.65);
  backdrop-filter: blur(10px);
  z-index: 400;
  align-items: flex-start; justify-content: center;
  padding: 24px 16px;
  overflow-y: auto;
}
.vs-overlay.open { display: flex; }

.vs-modal {
  background: var(--av-card-bg);
  border-radius: 20px;
  width: 100%; max-width: 960px;
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  margin: auto;
}

.vs-modal-header {
  padding: 24px 28px;
  background: linear-gradient(135deg, #1e1b4b, #312e81);
  display: flex; align-items: flex-start;
  justify-content: space-between; gap: 16px;
}
.vs-modal-title {
  font-family: 'DM Serif Display', serif;
  font-size: 24px; color: #fff; margin-bottom: 4px;
}
.vs-modal-sub { font-size: 13px; color: rgba(255,255,255,0.6); }
.vs-close-btn {
  width: 36px; height: 36px; border: none;
  background: rgba(255,255,255,0.12);
  border-radius: 50%; color: #fff;
  font-size: 18px; cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0; transition: all var(--transition);
}
.vs-close-btn:hover { background: rgba(255,255,255,0.25); }

.vs-loading {
  padding: 60px; text-align: center;
}

.vs-content { padding: 20px 24px 28px; }

.vs-stats {
  display: flex; gap: 12px; flex-wrap: wrap;
  margin-bottom: 18px;
}
.vs-stat-pill {
  display: flex; align-items: center; gap: 6px;
  background: var(--av-sidebar-bg);
  border: 1px solid var(--av-border);
  border-radius: 20px;
  padding: 5px 14px;
  font-size: 12px; font-weight: 600;
  color: var(--av-text-secondary);
}
.vs-stat-pill span { color: var(--av-green); }

.vs-toolbar {
  display: flex; align-items: center;
  justify-content: space-between;
  gap: 12px; flex-wrap: wrap;
  margin-bottom: 18px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--av-border);
}
.vs-filter-tabs { display: flex; gap: 6px; flex-wrap: wrap; }
.vs-filter-btn {
  padding: 6px 14px;
  border: 1px solid var(--av-border);
  border-radius: 20px;
  background: none; cursor: pointer;
  font-family: 'DM Sans', sans-serif;
  font-size: 12px; font-weight: 600;
  color: var(--av-text-secondary);
  transition: all var(--transition);
}
.vs-filter-btn:hover { border-color: var(--av-green); color: var(--av-green); }
.vs-filter-btn.active {
  background: var(--av-green); color: #fff;
  border-color: var(--av-green);
}

.vs-scenes { display: flex; flex-direction: column; gap: 14px; }

/* Scene card */
.vs-scene-card {
  border: 1px solid var(--av-border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: box-shadow var(--transition);
}
.vs-scene-card:hover { box-shadow: var(--shadow-md); }

.vs-scene-header {
  display: flex; align-items: center;
  gap: 10px; padding: 12px 16px;
  cursor: pointer;
  background: var(--av-sidebar-bg);
  border-bottom: 1px solid transparent;
  transition: all var(--transition);
  user-select: none;
}
.vs-scene-card.expanded .vs-scene-header {
  border-bottom-color: var(--av-border);
  background: #fff;
}
.vs-scene-num {
  width: 28px; height: 28px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 11px; font-weight: 700; flex-shrink: 0;
  background: var(--av-accent-dim); color: var(--av-green);
}
.vs-scene-meta { flex: 1; min-width: 0; }
.vs-scene-title {
  font-size: 13px; font-weight: 700;
  color: var(--av-text);
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.vs-scene-module {
  font-size: 11px; color: var(--av-text-secondary); margin-top: 1px;
}
.vs-scene-dur {
  font-size: 11px; font-weight: 600;
  color: var(--av-text-secondary);
  white-space: nowrap; flex-shrink: 0;
}
.vs-type-badge {
  font-size: 10px; font-weight: 800;
  letter-spacing: 0.8px; text-transform: uppercase;
  padding: 3px 9px; border-radius: 20px; flex-shrink: 0;
}
.vs-type-intro      { background: rgba(99,102,241,0.12); color: #6366f1; }
.vs-type-module_intro{ background: rgba(82,183,136,0.12); color: #52b788; }
.vs-type-content    { background: rgba(59,130,246,0.12); color: #3b82f6; }
.vs-type-quiz       { background: rgba(243,156,18,0.12); color: #f39c12; }
.vs-type-concepts   { background: rgba(168,85,247,0.12); color: #a855f7; }
.vs-type-application{ background: rgba(16,185,129,0.12); color: #10b981; }
.vs-type-outro      { background: rgba(239,68,68,0.12);  color: #ef4444; }
.vs-chevron {
  font-size: 12px; color: var(--av-text-secondary);
  transition: transform var(--transition); flex-shrink: 0;
}
.vs-scene-card.expanded .vs-chevron { transform: rotate(180deg); }

.vs-scene-body {
  display: none; padding: 16px;
  background: #fff;
  gap: 14px; flex-direction: column;
}
.vs-scene-card.expanded .vs-scene-body { display: flex; }

/* Scene body sections */
.vs-field { display: flex; flex-direction: column; gap: 6px; }
.vs-field-label {
  font-size: 10px; font-weight: 800;
  text-transform: uppercase; letter-spacing: 1.2px;
  color: var(--av-text-secondary);
  display: flex; align-items: center; gap: 5px;
}
.vs-field-content {
  font-size: 14px; line-height: 1.65;
  color: var(--av-text);
  background: var(--av-sidebar-bg);
  border: 1px solid var(--av-border);
  border-radius: var(--radius-sm);
  padding: 11px 14px;
  white-space: pre-wrap;
}
.vs-field-content.narration-field {
  font-size: 15px; line-height: 1.8;
  border-left: 3px solid #6366f1;
  background: rgba(99,102,241,0.04);
}
.vs-field-content.prompt-field {
  font-style: italic;
  border-left: 3px solid var(--av-green);
  background: var(--av-accent-dim);
  font-size: 13px;
}
.vs-field-content.notes-field {
  font-size: 12px; color: var(--av-text-secondary);
  border-left: 3px solid var(--av-warning);
  background: rgba(243,156,18,0.05);
}
.vs-onscreen-list {
  list-style: none; display: flex; flex-direction: column; gap: 5px;
}
.vs-onscreen-list li {
  font-size: 13px; padding: 6px 12px;
  background: var(--av-dark); color: #fff;
  border-radius: 6px;
  font-weight: 500;
}
.vs-two-col {
  display: grid; grid-template-columns: 1fr 1fr; gap: 14px;
}
.vs-copy-scene-btn {
  align-self: flex-end;
  padding: 7px 16px;
  border: 1px solid var(--av-border); border-radius: var(--radius-sm);
  background: none; cursor: pointer;
  font-family: 'DM Sans', sans-serif;
  font-size: 12px; font-weight: 600;
  color: var(--av-text-secondary);
  transition: all var(--transition);
}
.vs-copy-scene-btn:hover { border-color: var(--av-green); color: var(--av-green); }
.vs-copy-scene-btn.copied { border-color: var(--av-green); color: var(--av-green); background: var(--av-accent-dim); }

.vs-module-divider {
  display: flex; align-items: center; gap: 12px;
  padding: 6px 0 2px;
}
.vs-module-divider span {
  font-size: 12px; font-weight: 800;
  text-transform: uppercase; letter-spacing: 1px;
  color: var(--av-text-secondary); white-space: nowrap;
}
.vs-module-divider::before, .vs-module-divider::after {
  content: ''; flex: 1;
  height: 1px; background: var(--av-border);
}

.vs-error {
  padding: 28px; text-align: center;
  color: var(--av-danger); font-size: 14px;
}

@media (max-width: 768px) {
  .vs-two-col { grid-template-columns: 1fr; }
  .vs-toolbar { flex-direction: column; align-items: stretch; }
}

/* =====================================================
   CINEMATIC PRESENTATION VIEW
   ===================================================== */

/* Panel wrapper */
#viewCinematic { background: #0d1b1e; }

.cin-shell {
  height: calc(100vh - 56px);
  display: flex; flex-direction: column;
  background: #0d1b1e; position: relative; overflow: hidden;
}

/* Slide area */
.cin-viewport {
  flex: 1; position: relative; overflow: hidden;
  display: flex; align-items: center; justify-content: center;
  padding: 36px 48px 20px;
}

/* Animated grain texture */
.cin-viewport::before {
  content: '';
  position: absolute; inset: 0; pointer-events: none; z-index: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.65' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.04'/%3E%3C/svg%3E");
  opacity: 0.35;
}

.cin-slide {
  position: relative; z-index: 1;
  width: 100%; max-width: 1060px;
  min-height: 420px;
  animation: cinSlideIn 0.5s cubic-bezier(0.22,1,0.36,1);
}
@keyframes cinSlideIn {
  from { opacity: 0; transform: translateY(18px) scale(0.98); }
  to   { opacity: 1; transform: translateY(0) scale(1); }
}

/* Spoken-narration subtitle (item 4) — caption pinned to viewport bottom */
.cin-subtitle {
  position: absolute; z-index: 3;
  left: 50%; bottom: 18px; transform: translateX(-50%);
  max-width: min(900px, 86%);
  padding: 10px 18px; border-radius: 10px;
  background: rgba(10, 18, 18, 0.78);
  color: #f1f6f4; font-size: 16px; line-height: 1.5;
  text-align: center; letter-spacing: 0.2px;
  backdrop-filter: blur(4px);
  box-shadow: 0 6px 22px rgba(0,0,0,0.35);
  pointer-events: none;
}
@media (max-width: 760px) {
  .cin-subtitle { font-size: 14px; bottom: 12px; padding: 8px 14px; }
}

/* Module breadcrumb */
.cin-module-label-bar {
  position: absolute; top: 18px; left: 48px;
  font-size: 11px; font-weight: 700;
  letter-spacing: 1.5px; text-transform: uppercase;
  color: rgba(82,183,136,0.7); z-index: 5;
}

/* ── Shared elements ─────────────────────────────────── */
.cin-eyebrow {
  font-size: 11px; font-weight: 800;
  letter-spacing: 2px; text-transform: uppercase;
  color: rgba(82,183,136,0.8); margin-bottom: 10px;
}
.cin-big-title {
  font-family: 'DM Serif Display', serif;
  font-size: clamp(30px, 4vw, 48px);
  line-height: 1.15; color: #fff;
  margin-bottom: 24px;
}
.cin-section-title {
  font-family: 'DM Serif Display', serif;
  font-size: clamp(22px, 3vw, 34px);
  line-height: 1.2; color: #fff;
  margin-bottom: 22px;
}

/* Bullet list */
.cin-bullet-list { display: flex; flex-direction: column; gap: 13px; }
.cin-bullet {
  display: flex; align-items: flex-start; gap: 12px;
  font-size: clamp(14px, 1.6vw, 17px);
  line-height: 1.55; color: rgba(255,255,255,0.85);
  will-change: opacity, transform;
}
.cin-bullet-dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: #52b788; flex-shrink: 0; margin-top: 7px;
}
.cin-em { color: #52b788; font-style: normal; font-weight: 700; }

/* Visual */
.cin-visual {
  width: clamp(180px, 26vw, 300px);
  flex-shrink: 0;
  opacity: 0.9;
  filter: drop-shadow(0 8px 32px rgba(82,183,136,0.15));
}
.cin-visual svg, .cin-visual-corner svg { width: 100%; height: auto; }
.cin-visual-corner {
  position: absolute; right: 0; bottom: 0;
  width: clamp(120px, 18vw, 200px); opacity: 0.35;
}

/* ── Layouts ─────────────────────────────────────────── */
.cin-intro-layout,
.cin-content-layout {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 40px; align-items: center;
}
.cin-intro-left, .cin-content-left { display: flex; flex-direction: column; }

/* Module intro */
.cin-module-layout {
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  text-align: center; gap: 18px;
  position: relative; padding: 20px 0 180px;
}
.cin-module-num {
  font-size: 11px; font-weight: 800;
  letter-spacing: 3px; text-transform: uppercase;
  color: #52b788; padding: 5px 18px;
  border: 1px solid rgba(82,183,136,0.4);
  border-radius: 20px; display: inline-block;
}
.cin-module-title {
  font-family: 'DM Serif Display', serif;
  font-size: clamp(28px, 4.5vw, 52px);
  line-height: 1.15; color: #fff; max-width: 700px;
}
.cin-module-topics { display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; }
.cin-topic-chip {
  font-size: 13px; font-weight: 600;
  color: rgba(255,255,255,0.7);
  background: rgba(255,255,255,0.07);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: 20px; padding: 5px 14px;
}
.cin-module-visual {
  position: absolute; bottom: -20px; right: -20px;
  width: clamp(160px, 22vw, 260px); opacity: 0.2;
}

/* Quiz */
.cin-quiz-layout {
  display: flex; flex-direction: column; gap: 18px;
  position: relative; padding-right: 180px;
}
.cin-quiz-badge {
  font-size: 11px; font-weight: 800;
  letter-spacing: 2px; text-transform: uppercase;
  color: #f39c12;
  background: rgba(243,156,18,0.12);
  border: 1px solid rgba(243,156,18,0.3);
  padding: 4px 14px; border-radius: 20px;
  display: inline-block; width: fit-content;
}
.cin-quiz-q {
  font-family: 'DM Serif Display', serif;
  font-size: clamp(19px, 2.5vw, 27px);
  line-height: 1.35; color: #fff;
}
.cin-quiz-opts { display: flex; flex-direction: column; gap: 10px; }
.cin-quiz-opt {
  text-align: left; padding: 12px 18px;
  border: 1.5px solid rgba(255,255,255,0.12);
  border-radius: 10px; background: rgba(255,255,255,0.04);
  color: rgba(255,255,255,0.8);
  font-family: 'DM Sans', sans-serif; font-size: 14px; font-weight: 500;
  cursor: pointer; transition: all 0.2s;
}
.cin-quiz-opt:hover:not(:disabled) {
  border-color: rgba(82,183,136,0.5); background: rgba(82,183,136,0.08);
  color: #fff;
}
.cin-opt-correct { border-color: #52b788 !important; background: rgba(82,183,136,0.18) !important; color: #fff !important; }
.cin-opt-wrong   { border-color: #e74c3c !important; background: rgba(231,76,60,0.15) !important; }
.cin-quiz-expl {
  font-size: 13px; line-height: 1.6; padding: 12px 16px;
  border-radius: 8px; color: rgba(255,255,255,0.7);
}
.cin-expl-correct { background: rgba(82,183,136,0.12); border-left: 3px solid #52b788; }
.cin-expl-wrong   { background: rgba(231,76,60,0.10);  border-left: 3px solid #e74c3c; }

/* Concepts */
.cin-concepts-layout { display: flex; flex-direction: column; gap: 18px; }
.cin-kc-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}
.cin-kc-card {
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.10);
  border-top: 2px solid #52b788;
  border-radius: 10px; padding: 14px 16px;
}
.cin-kc-term {
  font-size: 11px; font-weight: 800;
  text-transform: uppercase; letter-spacing: 1px;
  color: #52b788; margin-bottom: 6px;
}
.cin-kc-def {
  font-size: 13px; line-height: 1.55;
  color: rgba(255,255,255,0.65);
}

/* Application */
.cin-app-layout {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 16px; position: relative; padding-bottom: 60px;
}
.cin-app-scenario, .cin-app-guidance {
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.10);
  border-radius: 14px; padding: 20px;
  display: flex; flex-direction: column; gap: 12px;
}
.cin-app-scenario { border-top: 2px solid rgba(16,185,129,0.6); }
.cin-app-guidance  { border-top: 2px solid rgba(82,183,136,0.6); }
.cin-app-label {
  font-size: 10px; font-weight: 800;
  letter-spacing: 2px; text-transform: uppercase;
  color: rgba(255,255,255,0.4);
}
.cin-app-text { font-size: 14px; line-height: 1.65; color: rgba(255,255,255,0.75); }

/* Outro */
.cin-outro-layout {
  display: flex; align-items: center; justify-content: center;
  text-align: center; flex-direction: column; gap: 20px;
  min-height: 400px; position: relative;
}
.cin-visual-bg {
  position: absolute; inset: 0;
  display: flex; align-items: center; justify-content: center;
  opacity: 0.2; pointer-events: none;
}
.cin-visual-bg svg { width: 280px; height: auto; }
.cin-outro-content { position: relative; z-index: 1; }

/* ── Controls bar ──────────────────────────────────────── */
.cin-controls {
  padding: 14px 36px;
  display: flex; align-items: center; gap: 12px;
  background: rgba(10,22,25,0.95);
  border-top: 1px solid rgba(255,255,255,0.06);
  flex-shrink: 0;
}
.cin-btn {
  width: 40px; height: 40px; border: none; border-radius: 50%;
  background: rgba(255,255,255,0.08); color: #fff;
  cursor: pointer; font-size: 16px;
  display: flex; align-items: center; justify-content: center;
  transition: all 0.2s; flex-shrink: 0;
}
.cin-btn:hover:not(:disabled) { background: #52b788; }
.cin-btn:disabled { opacity: 0.25; cursor: not-allowed; }
.cin-btn:disabled:hover { background: rgba(255,255,255,0.08); }
.cin-play-btn {
  width: 44px; height: 44px; font-size: 18px;
  background: #52b788; border: none; border-radius: 50%;
  color: #fff; cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  transition: all 0.2s; flex-shrink: 0;
}
.cin-play-btn:hover { filter: brightness(1.15); transform: scale(1.05); }

.cin-progress-wrap {
  flex: 1; display: flex; flex-direction: column; gap: 5px;
}
.cin-progress-bar {
  height: 3px; background: rgba(255,255,255,0.1);
  border-radius: 3px; cursor: pointer; overflow: hidden;
}
.cin-progress-fill {
  height: 100%; background: #52b788; border-radius: 3px;
  transition: width 0.3s ease;
}
.cin-counter {
  font-size: 11px; font-weight: 600;
  color: rgba(255,255,255,0.4); text-align: center;
}

/* Reuse audio indicator */
.cin-controls .audio-indicator { margin-left: 8px; }

/* Responsive */
@media (max-width: 900px) {
  .cin-intro-layout, .cin-content-layout { grid-template-columns: 1fr; }
  .cin-visual { display: none; }
  .cin-app-layout { grid-template-columns: 1fr; }
  .cin-kc-grid { grid-template-columns: 1fr; }
  .cin-quiz-layout { padding-right: 0; }
  .cin-viewport { padding: 24px; }
  .cin-controls { padding: 12px 16px; }
}

/* ── Cinematic voice controls ────────────────────────── */
.cin-voice-select {
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.15);
  border-radius: 8px;
  color: rgba(255,255,255,0.8);
  font-family: 'DM Sans', sans-serif;
  font-size: 12px; font-weight: 500;
  padding: 6px 10px;
  cursor: pointer;
  max-width: 180px;
  transition: all var(--transition);
}
.cin-voice-select:focus { outline: none; border-color: #52b788; }
.cin-voice-select option { background: #1a2e30; color: #fff; }

.cin-tts-badge {
  font-size: 11px; font-weight: 700;
  letter-spacing: 0.5px;
  color: rgba(255,255,255,0.4);
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 20px;
  padding: 4px 12px;
  white-space: nowrap;
  cursor: default;
  flex-shrink: 0;
}
/* Subtitle (CC) toggle in the presentation controls */
.cin-cc-btn {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 11px; font-weight: 700; letter-spacing: 0.5px;
  color: rgba(255,255,255,0.45);
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: 20px; padding: 4px 12px;
  white-space: nowrap; flex-shrink: 0; cursor: pointer;
  transition: color var(--transition), background var(--transition), border-color var(--transition);
}
.cin-cc-btn:hover { color: rgba(255,255,255,0.8); }
.cin-cc-btn.active {
  color: #fff; background: rgba(82,183,136,0.22);
  border-color: rgba(82,183,136,0.55);
}
.cin-cc-btn .cc-icon { font-size: 12px; }
.cin-badge-google {
  color: #52b788;
  background: rgba(82,183,136,0.12);
  border-color: rgba(82,183,136,0.3);
}

/* Loading pulse on audio bars */
.cin-loading .audio-bar {
  animation: cinLoadPulse 0.6s ease-in-out infinite alternate !important;
  background: rgba(255,255,255,0.4) !important;
}
@keyframes cinLoadPulse {
  from { opacity: 0.3; }
  to   { opacity: 1; }
}

/* =====================================================
   SCORM + VOICEOVER EXPORT MODAL
   ===================================================== */
.btn-scorm-audio {
  background: linear-gradient(135deg, #0ea5e9, #0284c7);
  color: #fff; border: none;
}
.btn-scorm-audio:hover { filter: brightness(1.12); }

.sa-overlay {
  display: none; position: fixed; inset: 0;
  background: rgba(24,48,50,0.65);
  backdrop-filter: blur(10px);
  z-index: 400;
  align-items: center; justify-content: center;
  padding: 24px 16px; overflow-y: auto;
}
.sa-overlay.open { display: flex; }

.sa-modal {
  background: var(--av-card-bg);
  border-radius: 20px;
  width: 100%; max-width: 640px;
  box-shadow: var(--shadow-lg);
  overflow: hidden; margin: auto;
}

.sa-header {
  padding: 22px 28px;
  background: linear-gradient(135deg, #0c2a3a, #0a3d52);
  display: flex; align-items: flex-start;
  justify-content: space-between; gap: 16px;
}
.sa-title { font-family: 'DM Serif Display', serif; font-size: 22px; color: #fff; margin-bottom: 4px; }
.sa-sub   { font-size: 13px; color: rgba(255,255,255,0.55); }

.sa-body { padding: 24px 28px 28px; }

.sa-info-row { display: grid; grid-template-columns: repeat(3,1fr); gap: 10px; margin-bottom: 24px; }
.sa-info-card {
  background: var(--av-sidebar-bg);
  border: 1px solid var(--av-border);
  border-radius: var(--radius-sm);
  padding: 14px; font-size: 13px;
  line-height: 1.5; color: var(--av-text-secondary);
}
.sa-info-icon { font-size: 22px; margin-bottom: 6px; }
.sa-info-card strong { color: var(--av-text); display: block; margin-bottom: 2px; }

.sa-form { display: flex; flex-direction: column; gap: 8px; margin-bottom: 16px; }
.sa-label { font-size: 12px; font-weight: 700; color: var(--av-text-secondary); text-transform: uppercase; letter-spacing: 0.8px; }
.sa-select {
  padding: 10px 12px;
  border: 1px solid var(--av-border); border-radius: var(--radius-sm);
  font-family: 'DM Sans', sans-serif; font-size: 14px;
  background: var(--av-card-bg); color: var(--av-text);
}
.sa-select:focus { outline: none; border-color: #0ea5e9; }
.sa-range-row { display: flex; align-items: center; gap: 12px; }
.sa-range-row input[type="range"] { flex: 1; }
.sa-range-val { font-size: 13px; font-weight: 700; color: #0ea5e9; min-width: 40px; }
.sa-hint { font-size: 12px; color: var(--av-text-secondary); margin-top: -4px; }

.sa-api-status { margin-bottom: 12px; }
.sa-api-ok   { color: var(--av-green); font-size: 13px; font-weight: 600; }
.sa-api-warn {
  background: #fff3cd; color: #856404;
  border: 1px solid #ffc107; border-radius: var(--radius-sm);
  padding: 10px 14px; font-size: 13px; line-height: 1.5;
}

.sa-footer { display: flex; gap: 10px; justify-content: flex-end; margin-top: 20px; }

/* Progress */
.sa-progress-wrap { text-align: center; padding: 12px 0 24px; }
.sa-progress-icon { font-size: 48px; margin-bottom: 12px; }
.sa-progress-title { font-family: 'DM Serif Display', serif; font-size: 20px; margin-bottom: 6px; }
.sa-progress-sub   { color: var(--av-text-secondary); font-size: 14px; margin-bottom: 20px; }
.sa-progress-bar-wrap { display: flex; align-items: center; gap: 12px; margin-bottom: 10px; }
.sa-progress-bar {
  flex: 1; height: 8px; background: var(--av-border);
  border-radius: 8px; overflow: hidden;
}
.sa-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, #0ea5e9, #0284c7);
  border-radius: 8px;
  transition: width 0.4s ease;
}
.sa-progress-pct { font-size: 13px; font-weight: 700; color: #0ea5e9; min-width: 36px; text-align: right; }
.sa-progress-note { font-size: 12px; color: var(--av-text-secondary); }

@media (max-width: 600px) {
  .sa-info-row { grid-template-columns: 1fr; }
}

/* ── Slide play button ────────────────────────────────── */
.slide-play-btn {
  width: 44px; height: 44px;
  border: none; border-radius: 50%;
  background: var(--av-green); color: #fff;
  cursor: pointer; font-size: 16px;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0; transition: all var(--transition);
}
.slide-play-btn:hover { filter: brightness(1.15); transform: scale(1.05); }

/* =====================================================
   COURSE EDITOR PANEL
   ===================================================== */
.editor-panel {
  position: fixed; top: 0; right: -680px; width: 660px;
  height: 100vh; z-index: 500;
  display: flex; flex-direction: column;
  background: var(--av-card-bg);
  box-shadow: -8px 0 40px rgba(24,48,50,0.18);
  transition: right 0.35s cubic-bezier(0.4,0,0.2,1);
}
.editor-panel.open { right: 0; }

.ed-header {
  padding: 18px 20px; display: flex; align-items: center; gap: 12px;
  background: var(--av-dark); color: #fff; flex-shrink: 0;
}
.ed-header h2 { font-family:'DM Serif Display',serif; font-size:18px; flex:1; }
.ed-header-sub { font-size:11px; color:rgba(255,255,255,0.5); margin-top:2px; }
.ed-close-btn {
  width:34px; height:34px; border:none;
  background:rgba(255,255,255,0.1); border-radius:50%;
  color:#fff; font-size:16px; cursor:pointer;
  display:flex; align-items:center; justify-content:center;
}
.ed-close-btn:hover { background:rgba(255,255,255,0.25); }

.ed-course-title-row {
  padding: 12px 16px;
  border-bottom: 1px solid var(--av-border);
  flex-shrink: 0;
}
.ed-course-title-row label { font-size:11px;font-weight:700;text-transform:uppercase;letter-spacing:0.8px;color:var(--av-text-secondary);display:block;margin-bottom:4px; }
.ed-course-title-row input { width:100%;padding:8px 12px;border:1px solid var(--av-border);border-radius:var(--radius-sm);font-family:'DM Sans',sans-serif;font-size:14px;font-weight:600; }
.ed-course-title-row input:focus { outline:none; border-color:var(--av-green); }

.ed-body { display:flex; flex:1; overflow:hidden; }

.ed-sidebar {
  width: 180px; min-width:180px;
  border-right: 1px solid var(--av-border);
  overflow-y: auto; padding: 8px 0;
  background: var(--av-sidebar-bg);
}
.ed-mod-item {
  padding: 10px 14px; cursor:pointer;
  font-size:12px; font-weight:500; color:var(--av-text-secondary);
  border-left:3px solid transparent;
  transition: all var(--transition); line-height:1.4;
}
.ed-mod-item:hover { background:var(--av-border); }
.ed-mod-item.active { color:var(--av-green); border-left-color:var(--av-green); background:var(--av-green-light); }

.ed-content {
  flex:1; overflow-y:auto; padding:0;
}
.ed-content::-webkit-scrollbar { width:5px; }
.ed-content::-webkit-scrollbar-thumb { background:var(--av-border); border-radius:5px; }

.ed-section {
  padding: 16px 18px;
  border-bottom: 1px solid var(--av-border);
}
.ed-section-title {
  font-size:12px; font-weight:800;
  text-transform:uppercase; letter-spacing:0.8px;
  color:var(--av-text-secondary); margin-bottom:12px;
  display:flex; align-items:center; gap:8px;
}
.ed-label {
  font-size:11px; font-weight:600; color:var(--av-text-secondary);
  display:block; margin-bottom:4px; margin-top:10px;
}
.ed-label:first-child { margin-top:0; }
.ed-input {
  width:100%; padding:7px 10px;
  border:1px solid var(--av-border); border-radius:var(--radius-sm);
  font-family:'DM Sans',sans-serif; font-size:13px;
  transition: border-color var(--transition);
}
.ed-input:focus { outline:none; border-color:var(--av-green); }
.ed-textarea {
  width:100%; padding:8px 10px;
  border:1px solid var(--av-border); border-radius:var(--radius-sm);
  font-family:'DM Sans',sans-serif; font-size:13px;
  resize:vertical; line-height:1.6;
  transition: border-color var(--transition);
}
.ed-textarea:focus { outline:none; border-color:var(--av-green); }

.ed-item {
  background:var(--av-sidebar-bg); border:1px solid var(--av-border);
  border-radius:var(--radius-sm); padding:12px; margin-bottom:10px;
}
.ed-item-header {
  display:flex; align-items:center; gap:8px; margin-bottom:8px;
}
.ed-item-title { flex:1; }
.ed-q-num {
  font-size:11px;font-weight:800;text-transform:uppercase;
  color:var(--av-green);background:var(--av-green-light);
  padding:2px 8px;border-radius:10px;flex-shrink:0;
}
.ed-add-btn {
  font-size:11px; font-weight:700; padding:4px 10px;
  border:1px dashed var(--av-green); border-radius:20px;
  background:none; color:var(--av-green); cursor:pointer;
  transition: all var(--transition);
}
.ed-add-btn:hover { background:var(--av-accent-dim); }
.ed-del-btn {
  width:26px;height:26px;border:none;border-radius:6px;
  background:none;cursor:pointer;font-size:13px;
  color:var(--av-text-secondary); flex-shrink:0;
  transition: all var(--transition);
}
.ed-del-btn:hover { background:#fde8e8; color:var(--av-danger); }

.ed-opts { display:flex; flex-direction:column; gap:6px; margin-top:6px; }
.ed-opt-row { display:flex; align-items:center; gap:6px; }
.ed-correct-btn {
  width:26px;height:26px;border:1px solid var(--av-border);border-radius:6px;
  background:none;cursor:pointer;font-size:12px;color:var(--av-text-secondary);
  flex-shrink:0; transition:all var(--transition);
}
.ed-correct-btn.active { background:var(--av-green);border-color:var(--av-green);color:#fff; }
.ed-correct-btn:hover:not(.active) { border-color:var(--av-green);color:var(--av-green); }
.ed-opt-row .ed-input { flex:1; }

.ed-kc-row { display:grid; grid-template-columns:1fr 2fr auto; gap:8px; align-items:center; }
.ed-kc-row .ed-del-btn { margin-top:0; }

/* Edit button in viewer topbar */
.edit-course-btn {
  padding:6px 14px;
  border:1px solid var(--av-border); border-radius:var(--radius-sm);
  background:var(--av-sidebar-bg); color:var(--av-text-secondary);
  font-family:'DM Sans',sans-serif; font-size:12px; font-weight:600;
  cursor:pointer; display:flex; align-items:center; gap:5px;
  transition:all var(--transition);
}
.edit-course-btn:hover { background:var(--av-accent-dim);color:var(--av-green);border-color:var(--av-green); }

/* Language toggle (EN/DE) — sits in the viewer topbar */
.lang-toggle-btn {
  padding:6px 12px;
  border:1px solid var(--av-border); border-radius:var(--radius-sm);
  background:var(--av-sidebar-bg); color:var(--av-text-secondary);
  font-family:'DM Sans',sans-serif; font-size:12px; font-weight:700;
  letter-spacing:0.5px;
  cursor:pointer; display:flex; align-items:center; gap:5px;
  transition:all var(--transition);
}
.lang-toggle-btn:hover { background:var(--av-accent-dim);color:var(--av-green);border-color:var(--av-green); }
.lang-toggle-btn.active { background:var(--av-green);color:#fff;border-color:var(--av-green); }

/* ── Persistent course links strip ───────────────────────────────── */
.course-links-strip {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  padding: 8px 20px;
  background: #183032;
  border-top: 1px solid rgba(255,255,255,.1);
  flex-shrink: 0;
}
.strip-btn {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 7px 18px;
  border-radius: 8px;
  font-family: Inter, 'DM Sans', sans-serif;
  font-size: 13px;
  font-weight: 700;
  text-decoration: none;
  letter-spacing: .3px;
  transition: opacity .2s, transform .1s;
  white-space: nowrap;
}
.strip-btn:hover { opacity: .85; transform: translateY(-1px); }
.strip-btn-pdf  { background: rgba(255,255,255,.1); border: 1px solid rgba(255,255,255,.2); color: #d8efdf; }
.strip-btn-quiz { background: #52b788; border: 1px solid #3fa070; color: #fff; }