/**
 * ============================================================
 * style.css — AI Threat Defense Interactive Course
 * ============================================================
 *
 * DESIGN SYSTEM (for agents extending this file):
 * ─────────────────────────────────────────────────
 * Dark glassmorphism + ComfyUI-inspired node-graph aesthetic.
 *
 * CSS CUSTOM PROPERTIES (tokens):
 *   --bg-base       Background base (#0a0b0f)
 *   --bg-surface    Card/panel surface (slightly lighter)
 *   --bg-elevated   Elevated card surface
 *   --border        Default border colour (rgba white ~8%)
 *   --text-primary  Primary text
 *   --text-muted    Muted/secondary text
 *   --accent-cyan   HSL(186°) — data/info accents
 *   --accent-violet HSL(262°) — AI/ML feature accents
 *   --accent-green  HSL(142°) — success / complete states
 *   --accent-orange HSL(28°)  — analogy/warning callouts
 *
 * COMPONENT SECTIONS IN THIS FILE:
 *   1.  Reset & base
 *   2.  CSS tokens
 *   3.  Canvas & page transition
 *   4.  Navbar
 *   5.  Home hero
 *   6.  Chapter cards grid
 *   7.  Chapter view
 *   8.  Level tabs
 *   9.  Level content (body, analogy, callout, code)
 *   10. Quiz
 *   11. Jev analysis section
 *   12. Footer / misc
 *   13. Animations & keyframes
 *   14. Responsive overrides
 * ============================================================
 */

/* ── 1. RESET & BASE ──────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background: #0a0b0f;
  color: #e8eaf0;
  min-height: 100vh;
  overflow-x: hidden;
  line-height: 1.65;
}

button { cursor: pointer; font-family: inherit; border: none; background: none; }
a { text-decoration: none; }
input, select, textarea { font-family: inherit; }

/* ── 2. CSS TOKENS ────────────────────────────────────────────────── */
:root {
  --bg-base:       #0a0b0f;
  --bg-surface:    #12141c;
  --bg-elevated:   #1a1d2e;
  --bg-card:       rgba(18, 20, 28, 0.85);
  --border:        rgba(255,255,255,0.08);
  --border-hover:  rgba(255,255,255,0.14);
  --text-primary:  #e8eaf0;
  --text-secondary:#a8b0c8;
  --text-muted:    #6b7494;
  --accent-cyan:   hsl(186,100%,55%);
  --accent-violet: hsl(262,80%,70%);
  --accent-green:  hsl(142,70%,50%);
  --accent-orange: hsl(28,95%,60%);
  --accent-magenta:hsl(322,80%,65%);
  --radius:        12px;
  --radius-lg:     18px;
  --shadow-card:   0 4px 24px rgba(0,0,0,0.4), 0 1px 0 rgba(255,255,255,0.04);
  --transition:    220ms cubic-bezier(.4,0,.2,1);
}

/* ── 3. CANVAS & PAGE TRANSITION ──────────────────────────────────── */
#nodeCanvas {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  opacity: 0.75;
  transition: opacity 600ms cubic-bezier(0.4, 0, 0.2, 1);
}

body.in-chapter #nodeCanvas {
  opacity: 0.06;
}


.page-transition {
  position: fixed;
  inset: 0;
  z-index: 1000;
  background: radial-gradient(circle at center, hsl(262,80%,15%) 0%, #0a0b0f 100%);
  pointer-events: none;
  opacity: 0;
  transition: opacity 250ms ease;
}
.page-transition.active { opacity: 1; }

/* ── 4. NAVBAR ────────────────────────────────────────────────────── */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  height: 56px;
  background: rgba(10,11,15,0.85);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  transition: box-shadow var(--transition);
}
.navbar.scrolled { box-shadow: 0 4px 24px rgba(0,0,0,0.5); }

.nav-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex;
  align-items: center;
  gap: 20px;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-primary);
  transition: opacity var(--transition);
  flex-shrink: 0;
}
.nav-logo:hover { opacity: 0.8; }
.nav-logo .accent { color: var(--accent-cyan); }

/* Breadcrumb (shown in chapter view) */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.82rem;
  flex: 1;
}
.breadcrumb.hidden { display: none; }
.bc-link {
  color: var(--accent-cyan);
  font-weight: 500;
  transition: opacity var(--transition);
}
.bc-link:hover { opacity: 0.75; }
.bc-sep  { color: var(--text-muted); }
.bc-current { color: var(--text-secondary); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; max-width: 380px; }

/* Nav right: progress + github */
.nav-right {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 16px;
  flex-shrink: 0;
}

.overall-progress-wrap {
  display: flex;
  align-items: center;
  gap: 10px;
}
.overall-progress-wrap.hidden { display: none; }
.prog-label { font-size: 0.75rem; color: var(--text-muted); white-space: nowrap; }
.overall-progress-bar {
  width: 80px;
  height: 4px;
  background: rgba(255,255,255,0.08);
  border-radius: 99px;
  overflow: hidden;
}
.overall-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent-cyan), var(--accent-violet));
  border-radius: 99px;
  transition: width 0.5s ease;
}

.nav-gh-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border-radius: 8px;
  border: 1px solid var(--border);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-secondary);
  background: rgba(255,255,255,0.04);
  transition: all var(--transition);
}
.nav-gh-btn:hover { border-color: var(--border-hover); color: var(--text-primary); background: rgba(255,255,255,0.07); }

/* ── 5. HOME HERO ─────────────────────────────────────────────────── */
#view-home {
  position: relative;
  z-index: 1;
  padding-top: 56px; /* navbar height */
}

.course-hero {
  text-align: center;
  padding: 80px 24px 60px;
  max-width: 860px;
  margin: 0 auto;
}

.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent-cyan);
  margin-bottom: 20px;
}
.eyebrow-dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--accent-cyan);
  animation: pulseDot 2s infinite;
}

.course-hero-title {
  font-size: clamp(2rem, 5vw, 3.4rem);
  font-weight: 900;
  line-height: 1.1;
  margin-bottom: 20px;
  letter-spacing: -0.02em;
}
.gradient-text {
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-violet), var(--accent-magenta));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.course-hero-sub {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 640px;
  margin: 0 auto 32px;
}

.course-stats-row {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 36px;
}
.cstat {
  padding: 7px 16px;
  border-radius: 99px;
  border: 1px solid var(--border);
  background: rgba(255,255,255,0.04);
  font-size: 0.85rem;
  color: var(--text-secondary);
}
.cstat strong { color: var(--accent-cyan); }

/* Home progress bar card */
.overall-prog-card {
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: rgba(255,255,255,0.03);
  padding: 16px 20px;
  text-align: left;
}
.home-prog-text { font-size: 0.85rem; color: var(--text-muted); }
#home-prog-text { display: block; margin-bottom: 10px; font-size: 0.85rem; color: var(--text-muted); }
.home-prog-bar {
  height: 5px;
  background: rgba(255,255,255,0.07);
  border-radius: 99px;
  overflow: hidden;
}
.home-prog-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent-cyan), var(--accent-violet));
  border-radius: 99px;
  transition: width 0.6s ease;
}

/* ── 6. CHAPTER CARDS GRID ────────────────────────────────────────── */
.chapters-home-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 20px;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px 60px;
  position: relative;
  z-index: 1;
}

.chapter-card {
  position: relative;
  text-align: left;
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-card);
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
  cursor: pointer;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.chapter-card:hover {
  transform: translateY(-3px);
  border-color: rgba(139,92,246,0.35);
  box-shadow: 0 12px 40px rgba(0,0,0,0.5), 0 0 0 1px rgba(139,92,246,0.15);
}
.chapter-card.done { border-color: rgba(74,222,128,0.25); }
.chapter-card.done:hover { border-color: rgba(74,222,128,0.4); }

.card-top {
  display: flex;
  align-items: flex-start;
  gap: 12px;
}
.card-icon { font-size: 1.8rem; flex-shrink: 0; }
.card-meta { flex: 1; display: flex; flex-direction: column; gap: 6px; }
.card-tag {
  font-size: 0.68rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent-cyan);
}

/* Chapter badge */
.ch-badge {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 99px;
}
.ch-badge.done    { background: rgba(74,222,128,0.15); color: var(--accent-green); }
.ch-badge.inprog  { background: rgba(139,92,246,0.15); color: var(--accent-violet); }

/* Jev mini score (top-right of card) */
.card-jev-score {
  margin-left: auto;
  text-align: right;
  flex-shrink: 0;
}
.jev-mini-score {
  font-size: 1.3rem;
  font-weight: 900;
  color: var(--accent-cyan);
  line-height: 1;
}
.jev-mini-label { font-size: 0.65rem; color: var(--text-muted); }

.card-num-title {
  font-size: 1.05rem;
  font-weight: 800;
  line-height: 1.3;
  color: var(--text-primary);
}
.card-num { color: var(--text-muted); font-weight: 700; }

.card-subtitle {
  font-size: 0.82rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* Use-case tags */
.card-use-cases {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 2px;
}
.use-case-tag {
  font-size: 0.72rem;
  padding: 3px 8px;
  border-radius: 6px;
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--border);
  color: var(--text-muted);
}

/* Progress dots */
.card-progress-dots {
  display: flex;
  gap: 5px;
  margin-top: auto;
}
.prog-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: rgba(255,255,255,0.1);
  transition: background var(--transition);
}
.prog-dot.filled { background: var(--accent-violet); }

/* Thin progress bar at bottom of card */
.card-progress-bar-wrap {
  height: 3px;
  border-radius: 99px;
  background: rgba(255,255,255,0.07);
  overflow: hidden;
}
.card-progress-bar {
  height: 100%;
  background: linear-gradient(90deg, var(--accent-violet), var(--accent-cyan));
  border-radius: 99px;
  transition: width 0.5s ease;
}

/* ── 7. CHAPTER VIEW ──────────────────────────────────────────────── */
#view-chapter {
  position: relative;
  z-index: 1;
  padding-top: 56px;
  min-height: 100vh;
}
#view-chapter.hidden { display: none; }
#view-home.hidden    { display: none; }

.chapter-view-inner {
  max-width: 860px;
  margin: 0 auto;
  padding: 48px 24px 80px;
}

/* Chapter header */
.ch-header {
  margin-bottom: 36px;
}
.ch-eyebrow {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}
.ch-icon   { font-size: 2rem; }
.ch-tag-badge {
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent-cyan);
}
.ch-title {
  font-size: clamp(1.6rem, 3.5vw, 2.4rem);
  font-weight: 900;
  letter-spacing: -0.02em;
  margin-bottom: 10px;
}
.ch-subtitle { font-size: 1rem; color: var(--text-secondary); margin-bottom: 14px; }
.ch-use-cases { display: flex; flex-wrap: wrap; gap: 8px; }

/* ── 8. LEVEL TABS ────────────────────────────────────────────────── */
.level-tabs {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 3px;
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 4px;
  margin-bottom: 32px;
}

.level-tab {
  position: relative;
  padding: 10px 8px;
  border-radius: 8px;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
  transition: all var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 5px;
  white-space: nowrap;
}
.level-tab:not([disabled]):hover {
  background: rgba(255,255,255,0.06);
  color: var(--text-secondary);
}
.level-tab.active {
  background: rgba(139,92,246,0.2);
  color: var(--text-primary);
  font-weight: 700;
}
.level-tab.done { color: var(--accent-green); }
.level-tab.locked { opacity: 0.45; cursor: not-allowed; }
.tab-lock { font-size: 0.65rem; opacity: 0.7; }

/* ── 9. LEVEL CONTENT ─────────────────────────────────────────────── */
.level-content {
  margin-bottom: 40px;
}

.level-pane { }

.level-heading {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--accent-violet);
  margin-bottom: 20px;
}

/* Analogy box (orange left-border — matches AI-ML course style) */
.analogy-box {
  border-left: 3px solid var(--accent-orange);
  background: rgba(251,146,60,0.07);
  border-radius: 0 var(--radius) var(--radius) 0;
  padding: 16px 18px;
  margin-bottom: 24px;
}
.analogy-label {
  font-size: 0.7rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  color: var(--accent-orange);
  margin-bottom: 8px;
}
.analogy-box p {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

/* Body text */
.level-body {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.75;
  margin-bottom: 24px;
}
.level-body strong { color: var(--text-primary); font-weight: 700; }
.level-body code {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.83em;
  background: rgba(255,255,255,0.08);
  padding: 2px 5px;
  border-radius: 4px;
  color: var(--accent-cyan);
}

/* Callout box (blue/teal — "In your daily life") */
.level-callout {
  border-left: 3px solid var(--accent-cyan);
  background: rgba(6,182,212,0.07);
  border-radius: 0 var(--radius) var(--radius) 0;
  padding: 14px 18px;
  margin-bottom: 24px;
}
.callout-label {
  font-size: 0.7rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  color: var(--accent-cyan);
  margin-bottom: 8px;
}
.callout-body {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
}
.callout-body strong { color: var(--text-primary); }

/* Code block */
.code-block {
  background: rgba(0,0,0,0.4);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius);
  overflow: hidden;
  margin-bottom: 20px;
}
.code-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 14px;
  background: rgba(255,255,255,0.04);
  border-bottom: 1px solid rgba(255,255,255,0.06);
}
.code-lang {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent-violet);
}
.copy-btn {
  display: flex;
  align-items: center;
  gap: 5px;
  font-size: 0.73rem;
  font-weight: 600;
  color: var(--text-muted);
  padding: 4px 10px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: rgba(255,255,255,0.04);
  transition: all var(--transition);
}
.copy-btn:hover { color: var(--text-primary); border-color: var(--border-hover); }

.code-block pre {
  padding: 16px 18px;
  overflow-x: auto;
  margin: 0;
}
.code-block code {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.8rem;
  line-height: 1.7;
  color: #c9d1d9;
  white-space: pre;
  background: none;
}

/* Level external link */
.level-code-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--accent-cyan);
  border: 1px solid rgba(6,182,212,0.3);
  border-radius: 8px;
  padding: 7px 14px;
  background: rgba(6,182,212,0.06);
  transition: all var(--transition);
  margin-bottom: 20px;
}
.level-code-link:hover { background: rgba(6,182,212,0.12); border-color: rgba(6,182,212,0.5); }

/* ── 9.5 ARCHITECTURE DIAGRAMS ─────────────────────────────────── */
.diagram-block {
  margin: 18px 0 22px;
  border: 1px solid rgba(0, 242, 254, 0.18);
  border-radius: var(--radius);
  background: rgba(0, 242, 254, 0.04);
  overflow-x: auto;
}

.arch-diagram {
  font-family: 'JetBrains Mono', 'Fira Code', 'Courier New', monospace;
  font-size: 0.72rem;
  line-height: 1.55;
  color: hsl(186, 80%, 72%);
  padding: 16px 20px;
  margin: 0;
  white-space: pre;
  background: transparent;
  border: none;
  text-shadow: 0 0 8px hsla(186, 100%, 60%, 0.25);
}

@media (max-width: 600px) {
  .arch-diagram { font-size: 0.62rem; padding: 12px; }
}

/* ── 10. QUIZ ─────────────────────────────────────────────────────── */

.quiz-block {
  margin-top: 40px;
  border: 1px solid rgba(255,200,0,0.2);
  border-radius: var(--radius-lg);
  background: rgba(255,200,0,0.03);
  overflow: hidden;
}

.quiz-header {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 20px 24px;
  border-bottom: 1px solid rgba(255,255,255,0.06);
  background: rgba(255,255,255,0.02);
}
.quiz-star { font-size: 1.4rem; flex-shrink: 0; }
.quiz-header h3 { font-size: 1rem; font-weight: 800; color: var(--text-primary); margin-bottom: 4px; }
.quiz-header p  { font-size: 0.8rem; color: var(--text-muted); }

.quiz-passed-banner {
  padding: 12px 24px;
  background: rgba(74,222,128,0.1);
  border-bottom: 1px solid rgba(74,222,128,0.2);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--accent-green);
}

.quiz-questions { padding: 20px 24px; display: flex; flex-direction: column; gap: 28px; }

.quiz-question {}
.quiz-q-text {
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 14px;
}
.quiz-options { display: flex; flex-direction: column; gap: 8px; }

.quiz-option {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 12px 14px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: rgba(255,255,255,0.03);
  cursor: pointer;
  transition: all var(--transition);
  font-size: 0.88rem;
  color: var(--text-secondary);
}
.quiz-option:hover { border-color: var(--border-hover); background: rgba(255,255,255,0.06); }
.quiz-option input[type="radio"] { margin-top: 2px; flex-shrink: 0; accent-color: var(--accent-violet); }

/* Quiz feedback states */
.quiz-option.correct {
  border-color: rgba(74,222,128,0.5);
  background: rgba(74,222,128,0.08);
  color: var(--accent-green);
}
.quiz-option.wrong {
  border-color: rgba(248,113,113,0.5);
  background: rgba(248,113,113,0.08);
  color: hsl(0,80%,65%);
}

/* Explanation text (revealed after submit) */
.quiz-explanation {
  margin-top: 10px;
  padding: 10px 14px;
  border-radius: 8px;
  background: rgba(139,92,246,0.08);
  border-left: 3px solid var(--accent-violet);
  font-size: 0.83rem;
  color: var(--text-secondary);
}
.quiz-explanation.hidden { display: none; }
.quiz-explanation strong { color: var(--text-primary); }

/* Submit button */
.quiz-submit-btn {
  display: block;
  margin: 4px 24px 24px;
  padding: 12px 28px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--accent-violet), hsl(262,80%,55%));
  color: #fff;
  font-size: 0.92rem;
  font-weight: 700;
  letter-spacing: 0.01em;
  transition: opacity var(--transition), transform var(--transition);
  box-shadow: 0 4px 16px rgba(139,92,246,0.35);
}
.quiz-submit-btn:hover { opacity: 0.9; transform: translateY(-1px); }
.quiz-submit-btn:active { transform: translateY(0); }

/* Result banner */
.quiz-result {
  margin: 0 24px 24px;
  padding: 12px 16px;
  border-radius: 10px;
  font-size: 0.88rem;
  font-weight: 600;
}
.quiz-result.hidden { display: none; }
.quiz-result.pass   { background: rgba(74,222,128,0.12); border: 1px solid rgba(74,222,128,0.3); color: var(--accent-green); }
.quiz-result.fail   { background: rgba(248,113,113,0.10); border: 1px solid rgba(248,113,113,0.25); color: hsl(0,80%,65%); }
.quiz-result.error  { background: rgba(251,146,60,0.10); border: 1px solid rgba(251,146,60,0.25); color: var(--accent-orange); }

/* "Next chapter" button inside result */
.quiz-next-ch-btn {
  margin-left: 12px;
  padding: 5px 14px;
  border-radius: 8px;
  border: 1px solid rgba(74,222,128,0.4);
  color: var(--accent-green);
  font-size: 0.83rem;
  font-weight: 700;
  background: rgba(74,222,128,0.08);
  transition: all var(--transition);
}
.quiz-next-ch-btn:hover { background: rgba(74,222,128,0.15); }

/* Level nav (Prev / Next level buttons) */
.level-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 24px;
  border-top: 1px solid var(--border);
}
.level-nav-btn {
  padding: 10px 20px;
  border-radius: 10px;
  border: 1px solid var(--border);
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-secondary);
  background: rgba(255,255,255,0.04);
  transition: all var(--transition);
}
.level-nav-btn:hover { border-color: var(--border-hover); color: var(--text-primary); background: rgba(255,255,255,0.07); }
.level-nav-btn.primary {
  background: linear-gradient(135deg, var(--accent-violet), hsl(262,80%,55%));
  border-color: transparent;
  color: #fff;
  box-shadow: 0 4px 16px rgba(139,92,246,0.3);
}
.level-nav-btn.primary:hover { opacity: 0.9; transform: translateY(-1px); }

/* ── 11. JEV ANALYSIS SECTION ─────────────────────────────────────── */
.jev-section-home {
  position: relative;
  z-index: 1;
  padding: 0 24px 80px;
}
.jev-home-inner {
  max-width: 1280px;
  margin: 0 auto;
}

/* Section header reused styles */
.section-tag {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent-violet);
  margin-bottom: 12px;
}
.section-title {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 900;
  letter-spacing: -0.02em;
  margin-bottom: 10px;
}
.section-subtitle {
  font-size: 0.92rem;
  color: var(--text-secondary);
  max-width: 640px;
  line-height: 1.65;
  margin-bottom: 8px;
}
.section-header { text-align: center; }

/* Pre-computed banner */
.jev-banner {
  text-align: center;
  margin-bottom: 32px;
}
.jev-banner span {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--accent-violet);
  background: rgba(139,92,246,0.08);
  border: 1px solid rgba(139,92,246,0.2);
  padding: 6px 16px;
  border-radius: 99px;
}

/* Score card grid */
.jev-scores-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
  margin-bottom: 32px;
}

.jev-score-card {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 16px;
  transition: border-color var(--transition), transform var(--transition);
}
.jev-score-card.scored { animation: fadeInUp 0.35s ease both; }
.jev-score-card:hover  { border-color: rgba(139,92,246,0.3); transform: translateY(-2px); }

.jev-card-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 14px;
}
.jev-card-title { display: flex; gap: 10px; align-items: flex-start; flex: 1; min-width: 0; }
.jev-card-icon  { font-size: 1.3rem; flex-shrink: 0; margin-top: 1px; }
.jev-card-num   { font-size: 0.68rem; font-weight: 800; color: var(--text-muted); letter-spacing: 0.08em; }
.jev-card-title h4 { font-size: 0.82rem; font-weight: 700; color: var(--text-primary); line-height: 1.35; margin-top: 2px; }

/* SVG score ring */
.jev-score-ring-wrap { position: relative; flex-shrink: 0; width: 64px; height: 64px; }
.jev-score-ring      { transform: rotate(-90deg); }
.jev-ring-bg   { fill: none; stroke: rgba(255,255,255,0.07); stroke-width: 5; }
.jev-ring-fill {
  fill: none;
  stroke-width: 5;
  stroke-linecap: round;
  stroke-dasharray: 163;
  transition: stroke-dashoffset 0.8s cubic-bezier(.4,0,.2,1);
}
.jev-ring-label {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}
.jev-ring-score { font-size: 1.05rem; font-weight: 900; line-height: 1; }
.jev-ring-max   { font-size: 0.55rem; color: var(--text-muted); }

/* Probability bars */
.jev-prob-bars  { display: flex; flex-direction: column; gap: 6px; margin-bottom: 12px; }
.jev-prob-row   { display: flex; align-items: center; gap: 8px; }
.jev-prob-label { font-size: 0.68rem; color: var(--text-muted); width: 58px; flex-shrink: 0; }
.jev-prob-bar-wrap { flex: 1; height: 5px; background: rgba(255,255,255,0.07); border-radius: 99px; overflow: hidden; }
.jev-prob-bar-fill { height: 100%; border-radius: 99px; transition: width 0.8s ease; }
.jev-prob-pct  { font-size: 0.68rem; color: var(--text-muted); width: 30px; text-align: right; flex-shrink: 0; }

/* Confidence pill */
.jev-confidence-row   { display: flex; align-items: center; justify-content: space-between; margin-bottom: 10px; }
.jev-confidence-label { font-size: 0.72rem; color: var(--text-muted); }
.jev-confidence-pill  { font-size: 0.7rem; font-weight: 700; padding: 3px 9px; border-radius: 99px; }
.conf-high   { background: rgba(74,222,128,0.15); color: var(--accent-green); }
.conf-medium { background: rgba(251,146,60,0.15); color: var(--accent-orange); }
.conf-low    { background: rgba(248,113,113,0.12); color: hsl(0,80%,65%); }

/* Noul verdict */
.jev-noul-verdict {
  display: flex;
  align-items: center;
  gap: 7px;
  font-size: 0.75rem;
  padding: 8px 10px;
  border-radius: 8px;
  border: 1px solid;
}
.jev-noul-verdict.yes { background: rgba(74,222,128,0.07); border-color: rgba(74,222,128,0.2); color: var(--accent-green); }
.jev-noul-verdict.no  { background: rgba(251,146,60,0.07); border-color: rgba(251,146,60,0.2); color: var(--accent-orange); }
.noul-icon  { flex-shrink: 0; }
.noul-prob  { margin-left: auto; font-size: 0.68rem; opacity: 0.7; }

/* Jev summary panel */
.jev-summary {
  background: rgba(139,92,246,0.06);
  border: 1px solid rgba(139,92,246,0.2);
  border-radius: var(--radius-lg);
  overflow: hidden;
  margin-bottom: 20px;
}
.jev-summary-inner {
  display: flex;
  align-items: stretch;
  gap: 0;
}
.jev-summary-score {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  padding: 28px 36px;
  background: rgba(139,92,246,0.08);
  border-right: 1px solid rgba(139,92,246,0.2);
  flex-shrink: 0;
}
.jev-summary-num {
  font-size: 3rem;
  font-weight: 900;
  color: var(--accent-violet);
  line-height: 1;
}
.jev-summary-sub {
  font-size: 0.72rem;
  color: var(--text-muted);
  text-align: center;
  line-height: 1.4;
}
.jev-summary-divider { display: none; }
.jev-summary-text {
  padding: 24px 28px;
  flex: 1;
}
.jev-summary-text h4 {
  font-size: 1rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 8px;
}
.jev-summary-text p { font-size: 0.88rem; color: var(--text-secondary); line-height: 1.65; }

/* Attribution */
.jev-attr {
  text-align: center;
  font-size: 0.72rem;
  color: var(--text-muted);
}
.jev-attr a { color: var(--accent-violet); }

/* ── 12. MISC / UTILITIES ─────────────────────────────────────────── */
.hidden { display: none !important; }

/* Scrollbar */
::-webkit-scrollbar       { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.12); border-radius: 99px; }

/* ── 13. ANIMATIONS & KEYFRAMES ───────────────────────────────────── */
@keyframes pulseDot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50%       { opacity: 0.5; transform: scale(0.7); }
}

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(16px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ── 14. RESPONSIVE OVERRIDES ─────────────────────────────────────── */
@media (max-width: 768px) {
  .chapters-home-grid {
    grid-template-columns: 1fr;
    padding: 0 16px 48px;
  }
  .chapter-view-inner { padding: 32px 16px 60px; }
  .level-tabs {
    grid-template-columns: repeat(3, 1fr);
    font-size: 0.72rem;
  }
  .level-tab:nth-child(4),
  .level-tab:nth-child(5) { grid-column: span 1; }
  .jev-scores-grid { grid-template-columns: 1fr; }
  .jev-summary-inner { flex-direction: column; }
  .jev-summary-score { border-right: none; border-bottom: 1px solid rgba(139,92,246,0.2); padding: 20px; }
  .bc-current { max-width: 160px; }
  .nav-right .prog-label,
  .nav-right .overall-progress-bar { display: none; }
}

@media (max-width: 480px) {
  .course-stats-row { gap: 6px; }
  .cstat { font-size: 0.78rem; padding: 5px 10px; }
  .level-tabs { grid-template-columns: 1fr 1fr; }
}