/* ============================================================
   JavaScript A-Z Learning Module - CSS
   Theme: JavaScript Yellow (#F7DF1E) on Dark Background
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=JetBrains+Mono:wght@400;500;600&family=Hind+Siliguri:wght@400;500;600;700&display=swap');

/* ---- CSS Variables ---- */
:root {
  --js-yellow: #F7DF1E;
  --js-yellow-dark: #c9b700;
  --js-yellow-glow: rgba(247, 223, 30, 0.15);
  --js-black: #1a1a1a;
  --bg: #0d0d0d;
  --surface: #1a1a1a;
  --surface2: #222222;
  --border: #2e2e2e;
  --text: #e8e8e8;
  --text-light: #999;
  --text-muted: #666;
  --success: #2ed573;
  --danger: #ff4757;
  --warning: #ffa502;
  --info: #1e90ff;
  --font-main: 'Inter', 'Hind Siliguri', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
  --sidebar-w: 280px;
  --nav-h: 60px;
  --radius: 10px;
  --shadow: 0 4px 20px rgba(0,0,0,0.4);
}
.light-mode {
  --bg: #f5f5f0;
  --surface: #ffffff;
  --surface2: #f0f0ea;
  --border: #ddd;
  --text: #1a1a1a;
  --text-light: #555;
  --text-muted: #999;
  --shadow: 0 4px 20px rgba(0,0,0,0.1);
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  font-family: var(--font-main);
  background: var(--bg);
  color: var(--text);
  font-size: 15px;
  line-height: 1.7;
  transition: background 0.3s, color 0.3s;
}

/* ============================================================
   TOPNAV
   ============================================================ */
.topnav {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-h);
  background: rgba(13, 13, 13, 0.95);
  border-bottom: 1px solid rgba(247, 223, 30, 0.2);
  backdrop-filter: blur(12px);
  display: flex;
  align-items: center;
  padding: 0 20px;
  gap: 16px;
  z-index: 1000;
}
.light-mode .topnav {
  background: rgba(255, 255, 255, 0.95);
  border-bottom-color: rgba(247, 223, 30, 0.4);
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}
.brand-icon { font-size: 1.4rem; animation: spin3d 6s linear infinite; }
@keyframes spin3d {
  0%   { transform: rotateY(0deg); }
  50%  { transform: rotateY(180deg); }
  100% { transform: rotateY(360deg); }
}
.brand-name { font-weight: 800; font-size: 1.1rem; color: var(--js-yellow); }
.brand-tag {
  font-size: 0.72rem;
  background: var(--js-yellow-glow);
  color: var(--js-yellow);
  border: 1px solid var(--js-yellow);
  border-radius: 20px;
  padding: 2px 10px;
  font-weight: 600;
  letter-spacing: 0.5px;
}
.btn-back {
  color: var(--text-light);
  text-decoration: none;
  font-size: 0.8rem;
  padding: 4px 10px;
  border: 1px solid var(--border);
  border-radius: 6px;
  transition: all 0.2s;
  margin-left: 4px;
}
.btn-back:hover { color: var(--js-yellow); border-color: var(--js-yellow); }

.nav-links {
  display: flex;
  gap: 4px;
  flex: 1;
  justify-content: center;
}
.nav-link {
  color: var(--text-light);
  text-decoration: none;
  padding: 6px 14px;
  border-radius: 8px;
  font-size: 0.85rem;
  font-weight: 500;
  transition: all 0.2s;
  white-space: nowrap;
}
.nav-link:hover, .nav-link.active {
  color: var(--js-yellow);
  background: var(--js-yellow-glow);
}
.nav-link.active { font-weight: 700; }

.nav-actions { display: flex; align-items: center; gap: 10px; flex-shrink: 0; }

.search-wrap { position: relative; }
.search-wrap input {
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 7px 14px;
  border-radius: 8px;
  width: 200px;
  font-family: inherit;
  font-size: 0.85rem;
  transition: border-color 0.2s;
}
.search-wrap input:focus { outline: none; border-color: var(--js-yellow); }
.search-results {
  display: none;
  position: absolute;
  top: calc(100% + 5px);
  left: 0;
  right: 0;
  background: var(--surface);
  border: 1px solid var(--js-yellow);
  border-radius: 8px;
  overflow: hidden;
  z-index: 1100;
  box-shadow: var(--shadow);
}
.search-results.open { display: block; }
.search-result-item {
  padding: 10px 14px;
  cursor: pointer;
  font-size: 0.85rem;
  transition: background 0.15s;
}
.search-result-item:hover { background: var(--js-yellow-glow); color: var(--js-yellow); }

.theme-toggle {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 6px 10px;
  cursor: pointer;
  font-size: 1rem;
  transition: all 0.2s;
}
.theme-toggle:hover { border-color: var(--js-yellow); }

.hamburger {
  display: none;
  background: none;
  border: 1px solid var(--border);
  color: var(--text);
  padding: 6px 10px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 1rem;
}

/* ============================================================
   LAYOUT
   ============================================================ */
.layout {
  display: flex;
  margin-top: var(--nav-h);
  min-height: calc(100vh - var(--nav-h));
}

/* ---- SIDEBAR ---- */
.sidebar {
  width: var(--sidebar-w);
  flex-shrink: 0;
  background: var(--surface);
  border-right: 1px solid var(--border);
  height: calc(100vh - var(--nav-h));
  position: sticky;
  top: var(--nav-h);
  overflow-y: auto;
  padding-bottom: 30px;
}
.sidebar::-webkit-scrollbar { width: 4px; }
.sidebar::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }

.sidebar-header {
  padding: 20px 16px 12px;
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  background: var(--surface);
  z-index: 10;
}
.sidebar-header h3 { font-size: 0.9rem; color: var(--js-yellow); font-weight: 700; margin-bottom: 10px; }
.level-badges { display: flex; flex-wrap: wrap; gap: 5px; }
.badge {
  font-size: 0.7rem;
  padding: 2px 8px;
  border-radius: 12px;
  font-weight: 600;
}
.badge.beginner    { background: rgba(46, 213, 115, 0.15); color: #2ed573; border: 1px solid #2ed573; }
.badge.intermediate{ background: rgba(247, 223, 30, 0.15); color: #F7DF1E; border: 1px solid #F7DF1E; }
.badge.advanced    { background: rgba(255, 71, 87, 0.15); color: #ff6b7a; border: 1px solid #ff6b7a; }

.day-list { list-style: none; padding: 10px 0; }
.day-list li { padding: 0; }
.day-list li a {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 16px;
  text-decoration: none;
  color: var(--text-light);
  font-size: 0.85rem;
  transition: all 0.2s;
  border-left: 3px solid transparent;
  cursor: pointer;
}
.day-list li a:hover { color: var(--js-yellow); background: var(--js-yellow-glow); }
.day-list li a.active { color: var(--js-yellow); border-left-color: var(--js-yellow); background: var(--js-yellow-glow); font-weight: 600; }
.day-list .module-header {
  padding: 12px 16px 4px;
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--js-yellow);
  text-transform: uppercase;
  letter-spacing: 1px;
}
.lesson-num {
  min-width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--surface2);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.7rem;
  font-weight: 600;
}
.day-list li a.active .lesson-num { background: var(--js-yellow); color: #000; }

/* ---- MAIN ---- */
.main-content {
  flex: 1;
  padding: 30px;
  max-width: calc(100vw - var(--sidebar-w));
  overflow-x: hidden;
}

.section { display: none; }
.section.active { display: block; }

/* ============================================================
   DASHBOARD
   ============================================================ */
.hero-banner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: center;
  background: linear-gradient(135deg, #111 0%, #1a1a00 50%, #111 100%);
  border: 1px solid rgba(247, 223, 30, 0.2);
  border-radius: 16px;
  padding: 40px;
  margin-bottom: 30px;
  position: relative;
  overflow: hidden;
}
.hero-banner::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(247, 223, 30, 0.07) 0%, transparent 70%);
  pointer-events: none;
}

.js-badge {
  display: inline-block;
  background: var(--js-yellow);
  color: #000;
  font-weight: 800;
  font-size: 0.7rem;
  letter-spacing: 2px;
  padding: 4px 14px;
  border-radius: 4px;
  margin-bottom: 16px;
}
.hero-text h1 { font-size: 2rem; margin-bottom: 14px; line-height: 1.2; }
.hero-text p { color: var(--text-light); margin-bottom: 24px; line-height: 1.7; }
.hero-btns { display: flex; gap: 12px; flex-wrap: wrap; }
.btn-hero-primary {
  background: var(--js-yellow);
  color: #000;
  border: none;
  padding: 12px 24px;
  border-radius: 8px;
  font-weight: 700;
  cursor: pointer;
  font-size: 0.95rem;
  transition: all 0.2s;
  font-family: inherit;
}
.btn-hero-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 20px rgba(247, 223, 30, 0.3); }
.btn-hero-secondary {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
  padding: 12px 24px;
  border-radius: 8px;
  font-weight: 600;
  cursor: pointer;
  font-size: 0.95rem;
  transition: all 0.2s;
  font-family: inherit;
}
.btn-hero-secondary:hover { border-color: var(--js-yellow); color: var(--js-yellow); }

/* Code Preview */
.hero-graphic { position: relative; }
.code-preview {
  background: #0d0d0d;
  border: 1px solid rgba(247, 223, 30, 0.3);
  border-radius: 10px;
  padding: 20px;
  font-family: var(--font-mono);
  font-size: 0.88rem;
  line-height: 1.9;
  position: relative;
  box-shadow: 0 0 30px rgba(247, 223, 30, 0.05);
}
.code-preview::before {
  content: '⬤ ⬤ ⬤';
  display: block;
  color: #555;
  font-size: 0.7rem;
  margin-bottom: 12px;
  letter-spacing: 4px;
}
.code-line { white-space: pre; }
.code-line.pl { padding-left: 1em; }
.kw { color: #c792ea; }
.var { color: #82aaff; }
.str { color: #c3e88d; }
.fn  { color: #82aaff; }
.cmt { color: #546e7a; font-style: italic; }
.tpl { color: #f78c6c; }
.code-output {
  margin-top: 10px;
  padding: 8px 12px;
  background: rgba(247, 223, 30, 0.08);
  border-left: 3px solid var(--js-yellow);
  border-radius: 4px;
  color: var(--js-yellow);
  font-family: var(--font-mono);
  font-size: 0.85rem;
}

/* Stats */
.stats-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-bottom: 30px;
}
.stat-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px;
  text-align: center;
  transition: transform 0.2s, border-color 0.2s;
}
.stat-card:hover { transform: translateY(-3px); border-color: var(--js-yellow); }
.stat-num { display: block; font-size: 2rem; font-weight: 800; color: var(--js-yellow); line-height: 1; }
.stat-label { font-size: 0.8rem; color: var(--text-light); margin-top: 4px; display: block; }

.section-title { font-size: 1.2rem; font-weight: 700; color: var(--js-yellow); margin-bottom: 20px; }

/* Overview Grid */
.overview-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}
.ov-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px;
  transition: transform 0.2s;
}
.ov-card:hover { transform: translateY(-3px); }
.ov-card h3 { font-size: 1.1rem; margin-bottom: 14px; }
.ov-card ul { list-style: none; }
.ov-card ul li { padding: 4px 0; font-size: 0.88rem; color: var(--text-light); }
.ov-level {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  margin-bottom: 8px;
}
.beginner-card    { border-left: 3px solid #2ed573; }
.beginner-card .ov-level { color: #2ed573; }
.intermediate-card{ border-left: 3px solid #F7DF1E; }
.intermediate-card .ov-level { color: #F7DF1E; }
.advanced-card    { border-left: 3px solid #ff6b7a; }
.advanced-card .ov-level { color: #ff6b7a; }
.pro-card         { border-left: 3px solid #70d6ff; }
.pro-card .ov-level { color: #70d6ff; }

/* ============================================================
   LESSONS
   ============================================================ */
.lesson-header-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 24px;
}
.lesson-header-row h2 { font-size: 1.4rem; }

.module-filter { display: flex; gap: 8px; flex-wrap: wrap; }
.filter-btn {
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text-light);
  padding: 6px 14px;
  border-radius: 20px;
  cursor: pointer;
  font-size: 0.83rem;
  font-family: inherit;
  transition: all 0.2s;
}
.filter-btn:hover, .filter-btn.active {
  background: var(--js-yellow);
  color: #000;
  border-color: var(--js-yellow);
  font-weight: 700;
}

.lesson-detail { min-height: 400px; }
.lesson-placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 300px;
  color: var(--text-muted);
  gap: 12px;
}
.lesson-placeholder span { font-size: 2.5rem; }
.lesson-placeholder p { font-size: 1rem; }

/* Lesson Card */
.lesson-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
}
.lesson-card-header {
  background: linear-gradient(135deg, #111 0%, #1a1a00 100%);
  border-bottom: 1px solid rgba(247, 223, 30, 0.2);
  padding: 20px 24px;
  display: flex;
  align-items: center;
  gap: 12px;
}
.lesson-card-header h3 { font-size: 1.2rem; }
.lesson-level-badge {
  font-size: 0.7rem;
  padding: 3px 10px;
  border-radius: 12px;
  font-weight: 700;
  margin-left: auto;
}
.level-1 { background: rgba(46,213,115,0.15); color: #2ed573; border: 1px solid #2ed573; }
.level-2 { background: rgba(247,223,30,0.15); color: #F7DF1E; border: 1px solid #F7DF1E; }
.level-3 { background: rgba(255,107,122,0.15); color: #ff6b7a; border: 1px solid #ff6b7a; }
.level-4 { background: rgba(112,214,255,0.15); color: #70d6ff; border: 1px solid #70d6ff; }

.lesson-card-body { padding: 28px; }
.lesson-card-body h3 { color: var(--js-yellow); margin: 24px 0 10px; font-size: 1rem; }
.lesson-card-body h3:first-child { margin-top: 0; }
.lesson-card-body p { color: var(--text-light); margin-bottom: 14px; line-height: 1.8; }
.lesson-card-body ul, .lesson-card-body ol { padding-left: 20px; margin-bottom: 14px; }
.lesson-card-body li { color: var(--text-light); margin-bottom: 6px; }
.lesson-card-body strong { color: var(--text); }

/* Code Block */
.codeblock {
  background: #0d0d0d;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 16px;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  line-height: 1.8;
  overflow-x: auto;
  margin: 14px 0;
  position: relative;
}
.light-mode .codeblock { background: #1a1a1a; }
.codeblock .comment { color: #546e7a; font-style: italic; }
.codeblock .keyword { color: #c792ea; }
.codeblock .string  { color: #c3e88d; }
.codeblock .number  { color: #f78c6c; }
.codeblock .func    { color: #82aaff; }
.codeblock .output  { color: var(--js-yellow); border-left: 3px solid var(--js-yellow); padding-left: 10px; margin-top: 8px; }

/* Try It Button */
.try-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--js-yellow-glow);
  color: var(--js-yellow);
  border: 1px solid var(--js-yellow);
  border-radius: 6px;
  padding: 6px 14px;
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  font-family: inherit;
  transition: all 0.2s;
  margin-top: 8px;
}
.try-btn:hover { background: var(--js-yellow); color: #000; }

/* Lesson Nav Buttons */
.lesson-nav-btns {
  display: flex;
  gap: 12px;
  justify-content: space-between;
  margin-top: 30px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
}
.lesson-nav-btns button {
  padding: 10px 20px;
  border-radius: 8px;
  cursor: pointer;
  font-family: inherit;
  font-weight: 600;
  font-size: 0.9rem;
  transition: all 0.2s;
}
.btn-prev { background: var(--surface2); border: 1px solid var(--border); color: var(--text); }
.btn-prev:hover { border-color: var(--js-yellow); color: var(--js-yellow); }
.btn-next { background: var(--js-yellow); border: none; color: #000; }
.btn-next:hover { transform: translateY(-1px); box-shadow: 0 4px 12px rgba(247,223,30,0.3); }

/* ============================================================
   CONSOLE
   ============================================================ */
.section-header { margin-bottom: 24px; }
.section-header h2 { font-size: 1.4rem; margin-bottom: 6px; }
.section-header p { color: var(--text-light); }

.console-container {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
}

.snippet-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
  background: var(--surface2);
}
.snippet-label { font-size: 0.8rem; color: var(--text-light); flex-shrink: 0; }
.snippet-btn {
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text-light);
  padding: 4px 12px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.78rem;
  font-family: inherit;
  transition: all 0.2s;
}
.snippet-btn:hover { border-color: var(--js-yellow); color: var(--js-yellow); }

.console-split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  height: 480px;
}

.console-editor-wrap, .console-output-wrap {
  display: flex;
  flex-direction: column;
}
.console-editor-wrap { border-right: 1px solid var(--border); }

.editor-header, .output-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 16px;
  border-bottom: 1px solid var(--border);
  background: var(--surface2);
  font-size: 0.85rem;
  font-weight: 600;
}

.editor-actions { display: flex; gap: 8px; }
.btn-run {
  background: var(--js-yellow);
  color: #000;
  border: none;
  padding: 5px 14px;
  border-radius: 6px;
  cursor: pointer;
  font-weight: 700;
  font-size: 0.83rem;
  font-family: inherit;
  transition: all 0.2s;
}
.btn-run:hover { background: var(--js-yellow-dark); }
.btn-clear-editor, .btn-clear-out {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-light);
  padding: 5px 12px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.78rem;
  font-family: inherit;
  transition: all 0.2s;
}
.btn-clear-editor:hover, .btn-clear-out:hover { border-color: var(--danger); color: var(--danger); }

.editor-wrap {
  flex: 1;
  display: flex;
  overflow: hidden;
  background: #0d0d0d;
}
.light-mode .editor-wrap { background: #1a1a1a; }

.line-numbers {
  padding: 16px 8px;
  background: #111;
  color: #444;
  font-family: var(--font-mono);
  font-size: 0.83rem;
  line-height: 1.7;
  text-align: right;
  min-width: 40px;
  user-select: none;
  border-right: 1px solid var(--border);
  white-space: pre;
}

#codeEditor {
  flex: 1;
  background: transparent;
  color: #c3e88d;
  border: none;
  outline: none;
  padding: 16px;
  font-family: var(--font-mono);
  font-size: 0.83rem;
  line-height: 1.7;
  resize: none;
  white-space: pre;
  overflow-wrap: normal;
  overflow-x: auto;
  tab-size: 2;
}

.output-area {
  flex: 1;
  padding: 16px;
  overflow-y: auto;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  line-height: 1.7;
  background: #0d0d0d;
}
.light-mode .output-area { background: #1a1a1a; }
.output-welcome { display: flex; flex-direction: column; align-items: center; justify-content: center; height: 100%; text-align: center; color: #444; gap: 8px; }
.out-icon { font-size: 2rem; }

.out-line { display: block; padding: 1px 0; }
.out-log   { color: var(--text); }
.out-warn  { color: var(--warning); }
.out-error { color: var(--danger); }
.out-info  { color: var(--info); }
.out-result{ color: var(--js-yellow); }
.out-sep   { color: #333; }

/* ============================================================
   REFERENCE
   ============================================================ */
.ref-tabs {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 20px;
}
.ref-tab {
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text-light);
  padding: 8px 16px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 0.85rem;
  font-family: inherit;
  font-weight: 500;
  transition: all 0.2s;
}
.ref-tab:hover, .ref-tab.active {
  background: var(--js-yellow);
  color: #000;
  border-color: var(--js-yellow);
  font-weight: 700;
}

.ref-content { }
.ref-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 16px;
}
.ref-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px;
  transition: border-color 0.2s;
}
.ref-card:hover { border-color: var(--js-yellow); }
.ref-card h4 {
  font-family: var(--font-mono);
  color: var(--js-yellow);
  font-size: 0.9rem;
  margin-bottom: 6px;
}
.ref-card .ref-desc { font-size: 0.83rem; color: var(--text-light); margin-bottom: 10px; }
.ref-card .ref-example {
  background: #0d0d0d;
  border-radius: 6px;
  padding: 10px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: #c3e88d;
  white-space: pre;
  overflow-x: auto;
}
.light-mode .ref-card .ref-example { background: #1a1a1a; }

/* ============================================================
   CHEAT SHEET
   ============================================================ */
.cheatsheet-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 16px;
}
.cheat-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
  transition: transform 0.2s, border-color 0.2s;
}
.cheat-card:hover { transform: translateY(-2px); border-color: var(--js-yellow); }
.cheat-header {
  background: linear-gradient(135deg, #111 0%, #1a1a00 100%);
  padding: 12px 16px;
  font-weight: 700;
  font-size: 0.85rem;
  color: var(--js-yellow);
  border-bottom: 1px solid rgba(247,223,30,0.2);
}
.cheat-body { padding: 14px; }
.cheat-item {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  padding: 5px 0;
  border-bottom: 1px solid var(--border);
  font-size: 0.8rem;
}
.cheat-item:last-child { border-bottom: none; }
.cheat-key {
  font-family: var(--font-mono);
  color: var(--js-yellow);
  font-size: 0.78rem;
}
.cheat-val { color: var(--text-light); }

/* ============================================================
   QUIZ
   ============================================================ */
.quiz-container {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 30px;
  max-width: 800px;
  margin: 0 auto;
}
.quiz-intro { text-align: center; }
.quiz-intro h3 { color: var(--js-yellow); margin-bottom: 10px; font-size: 1.5rem; }
.quiz-intro p { margin-bottom: 20px; color: var(--text-light); }

.quiz-settings {
  display: flex;
  gap: 24px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 24px;
  padding: 16px;
  background: var(--surface2);
  border-radius: 10px;
  border: 1px solid var(--border);
}
.setting-row { display: flex; align-items: center; gap: 10px; }
.setting-row label { font-size: 0.85rem; color: var(--text-light); }
.setting-row select {
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 6px 10px;
  border-radius: 6px;
  font-family: inherit;
  cursor: pointer;
}
.setting-row select:focus { outline: none; border-color: var(--js-yellow); }

.quiz-progress-bar { height: 8px; background: var(--bg); border-radius: 4px; overflow: hidden; margin-bottom: 15px; }
.quiz-progress-fill { height: 100%; background: var(--js-yellow); width: 0%; transition: width 0.3s ease; }
.quiz-status { display: flex; justify-content: space-between; font-size: 0.9rem; color: var(--text-light); margin-bottom: 20px; font-family: var(--font-mono); }
.timer-badge { background: rgba(247,223,30,0.1); color: var(--js-yellow); border: 1px solid var(--js-yellow); border-radius: 20px; padding: 2px 10px; }
.timer-badge.danger { background: rgba(255,71,87,0.1); color: var(--danger); border-color: var(--danger); }

.quiz-question-text { font-size: 1.15rem; margin-bottom: 20px; line-height: 1.6; }
.quiz-options { display: flex; flex-direction: column; gap: 12px; margin-bottom: 25px; }
.quiz-option {
  background: var(--bg);
  border: 1px solid var(--border);
  padding: 14px 18px;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.2s;
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.92rem;
}
.quiz-option:hover { border-color: var(--js-yellow); background: var(--js-yellow-glow); }
.quiz-option.selected { border-color: var(--js-yellow); background: var(--js-yellow-glow); }
.quiz-option.correct  { border-color: var(--success); background: rgba(46,213,115,0.08); }
.quiz-option.wrong    { border-color: var(--danger); background: rgba(255,71,87,0.08); }
.opt-letter {
  min-width: 28px; height: 28px;
  border-radius: 50%;
  background: var(--surface2);
  display: flex; align-items: center; justify-content: center;
  font-size: 0.8rem; font-weight: 700;
}
.quiz-option.selected .opt-letter { background: var(--js-yellow); color: #000; }
.quiz-option.correct  .opt-letter { background: var(--success); color: #000; }
.quiz-option.wrong    .opt-letter { background: var(--danger); color: #fff; }

.quiz-actions { display: flex; justify-content: flex-end; }

.quiz-result { text-align: center; }
.quiz-result h3 { font-size: 1.5rem; margin-bottom: 16px; }
.score-circle {
  width: 130px; height: 130px;
  border-radius: 50%;
  border: 8px solid var(--js-yellow);
  display: flex; align-items: center; justify-content: center;
  font-size: 2.2rem; font-weight: 800;
  margin: 0 auto 20px;
  color: var(--js-yellow);
  background: var(--js-yellow-glow);
  box-shadow: 0 0 30px rgba(247,223,30,0.2);
}
#quizMessage { color: var(--text-light); margin-bottom: 24px; font-size: 1rem; }

.review-answers {
  margin-top: 20px;
  text-align: left;
  border-top: 1px solid var(--border);
  padding-top: 20px;
  max-height: 400px;
  overflow-y: auto;
  margin-bottom: 24px;
}
.review-item {
  background: var(--bg);
  padding: 14px;
  border-radius: 8px;
  margin-bottom: 12px;
  border-left: 4px solid var(--border);
}
.review-item.review-correct { border-left-color: var(--success); }
.review-item.review-wrong   { border-left-color: var(--danger); }
.review-item p { margin-bottom: 6px; font-size: 0.88rem; }
.review-explanation {
  font-size: 0.83rem;
  color: var(--text-light);
  background: rgba(255,255,255,0.04);
  padding: 8px 12px;
  border-radius: 4px;
  margin-top: 8px;
  font-family: var(--font-mono);
}

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

/* Shared Buttons */
.btn-primary, .btn-secondary {
  padding: 11px 22px;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  font-weight: 700;
  font-family: inherit;
  font-size: 0.9rem;
  transition: all 0.2s;
}
.btn-primary { background: var(--js-yellow); color: #000; }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 6px 16px rgba(247,223,30,0.3); }
.btn-secondary { background: var(--surface); color: var(--text); border: 1px solid var(--border); }
.btn-secondary:hover { border-color: var(--js-yellow); color: var(--js-yellow); }
.btn-secondary:disabled { opacity: 0.4; cursor: not-allowed; }

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 1100px) {
  :root { --sidebar-w: 240px; }
  .hero-banner { grid-template-columns: 1fr; }
  .hero-graphic { display: none; }
  .stats-row { grid-template-columns: repeat(2, 1fr); }
  .overview-grid { grid-template-columns: 1fr; }
}

@media (max-width: 900px) {
  .nav-links { display: none; }
  .hamburger { display: block; }
  .sidebar {
    position: fixed;
    left: -100%;
    top: var(--nav-h);
    height: calc(100vh - var(--nav-h));
    z-index: 500;
    transition: left 0.3s;
    box-shadow: 4px 0 20px rgba(0,0,0,0.5);
  }
  .sidebar.open { left: 0; }
  .main-content { max-width: 100vw; padding: 20px; }
  .console-split { grid-template-columns: 1fr; height: auto; }
  .console-editor-wrap { height: 280px; border-right: none; border-bottom: 1px solid var(--border); }
  .console-output-wrap { height: 200px; }
}

@media (max-width: 600px) {
  .brand-tag { display: none; }
  .stats-row { grid-template-columns: repeat(2, 1fr); }
  .hero-banner { padding: 24px; }
  .main-content { padding: 16px; }
  .search-wrap input { width: 140px; }
}