/* =====================================================
   styles.css — MiniTestPro · Premium Design System
   Senior-level frontend · Light/Dark · Accessible
   ===================================================== */

/* ---------- CSS Custom Properties ---------- */
:root {
  --bg: #f5f7fb;
  --bg-alt: #ebeef5;
  --card: #ffffff;
  --card-hover: #fafbff;
  --text: #111827;
  --text-secondary: #4b5563;
  --muted: #9ca3af;
  --border: #e5e7eb;
  --border-hover: #d1d5db;
  --accent: #4f46e5;
  --accent-hover: #4338ca;
  --accent-light: rgba(79,70,229,.08);
  --accent-medium: rgba(79,70,229,.15);
  --accent2: #ec4899;
  --accent2-hover: #db2777;
  --success: #10b981;
  --success-bg: #ecfdf5;
  --success-border: #a7f3d0;
  --danger: #ef4444;
  --danger-bg: #fef2f2;
  --danger-border: #fecaca;
  --warning: #f59e0b;
  --warning-bg: #fffbeb;
  --warning-border: #fde68a;
  --info: #3b82f6;
  --info-bg: #eff6ff;
  --info-border: #bfdbfe;
  --radius: 16px;
  --radius-sm: 10px;
  --radius-xs: 6px;
  --shadow-xs: 0 1px 2px rgba(0,0,0,.05);
  --shadow: 0 1px 3px rgba(0,0,0,.06), 0 1px 2px rgba(0,0,0,.04);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,.07), 0 2px 4px -2px rgba(0,0,0,.05);
  --shadow-lg: 0 10px 25px -3px rgba(0,0,0,.08), 0 4px 6px -4px rgba(0,0,0,.04);
  --shadow-xl: 0 20px 50px -12px rgba(0,0,0,.12);
  --transition: .2s cubic-bezier(.4,0,.2,1);
  --transition-slow: .35s cubic-bezier(.4,0,.2,1);
  --font: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, monospace;
  --max-w: 1200px;
  --header-h: 68px;
  --glow-accent: 0 0 20px rgba(79,70,229,.2);
}

[data-theme="dark"] {
  --bg: #0b0f1a;
  --bg-alt: #111827;
  --card: #1f2937;
  --card-hover: #263044;
  --text: #f3f4f6;
  --text-secondary: #d1d5db;
  --muted: #6b7280;
  --border: #374151;
  --border-hover: #4b5563;
  --accent-light: rgba(129,120,248,.12);
  --accent-medium: rgba(129,120,248,.2);
  --shadow-xs: 0 1px 2px rgba(0,0,0,.2);
  --shadow: 0 1px 3px rgba(0,0,0,.3);
  --shadow-md: 0 4px 6px rgba(0,0,0,.25);
  --shadow-lg: 0 10px 25px rgba(0,0,0,.3);
  --shadow-xl: 0 20px 50px rgba(0,0,0,.4);
  --success-bg: rgba(16,185,129,.1);
  --success-border: rgba(16,185,129,.3);
  --danger-bg: rgba(239,68,68,.1);
  --danger-border: rgba(239,68,68,.3);
  --warning-bg: rgba(245,158,11,.1);
  --warning-border: rgba(245,158,11,.3);
  --info-bg: rgba(59,130,246,.1);
  --info-border: rgba(59,130,246,.3);
  --glow-accent: 0 0 30px rgba(129,120,248,.15);
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
img { max-width: 100%; display: block; }
a { color: var(--accent); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--accent-hover); }
ul, ol { list-style: none; }
button, input, select, textarea { font: inherit; color: inherit; }
button { cursor: pointer; border: none; background: none; }
::selection { background: var(--accent-medium); color: var(--accent); }

/* ---------- Utilities ---------- */
.container { max-width: var(--max-w); margin: 0 auto; padding: 0 24px; width: 100%; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); border: 0; }
.text-center { text-align: center; }
.mt-1 { margin-top: .5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }

/* ---------- Header ---------- */
.site-header {
  background: rgba(255,255,255,.85);
  backdrop-filter: blur(16px) saturate(180%);
  -webkit-backdrop-filter: blur(16px) saturate(180%);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-h);
}
[data-theme="dark"] .site-header {
  background: rgba(11,15,26,.85);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-h);
}
.logo {
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--text);
  display: flex;
  align-items: center;
  gap: 10px;
  letter-spacing: -.02em;
}
.logo .logo-icon {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: .85rem;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  color: #fff;
  font-weight: 800;
  flex-shrink: 0;
}
.logo span { color: var(--accent); }
.logo:hover { color: var(--text); }

.main-nav { display: flex; align-items: center; gap: 2px; }
.main-nav a {
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  font-size: .875rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: all var(--transition);
  position: relative;
}
.main-nav a:hover { background: var(--accent-light); color: var(--accent); }
.main-nav a.active { background: var(--accent-light); color: var(--accent); font-weight: 600; }

.nav-toggle {
  display: none;
  width: 40px;
  height: 40px;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  border-radius: var(--radius-sm);
  transition: background var(--transition);
}
.nav-toggle:hover { background: var(--accent-light); }
.nav-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: all var(--transition);
}
.nav-toggle.open span:nth-child(1) { transform: rotate(45deg) translate(5px,5px); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: rotate(-45deg) translate(5px,-5px); }

.theme-toggle {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  transition: all var(--transition);
}
.theme-toggle:hover { background: var(--accent-light); border-color: var(--accent); }
.header-actions { display: flex; align-items: center; gap: 8px; }

@media (max-width: 768px) {
  .nav-toggle { display: flex; }
  .main-nav {
    display: none;
    position: absolute;
    top: var(--header-h);
    left: 0; right: 0;
    background: var(--card);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    padding: 12px 16px;
    box-shadow: var(--shadow-lg);
  }
  .main-nav.open { display: flex; }
  .main-nav a { padding: 12px 16px; width: 100%; border-radius: var(--radius-xs); }
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  padding: 72px 0 56px;
  text-align: center;
  overflow: hidden;
}
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 60% 50% at 50% 0%, var(--accent-light) 0%, transparent 70%),
    radial-gradient(ellipse 40% 40% at 80% 50%, rgba(236,72,153,.06) 0%, transparent 70%);
  pointer-events: none;
}
.hero-content { position: relative; z-index: 1; }
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px 6px 8px;
  background: var(--accent-light);
  border: 1px solid var(--accent-medium);
  border-radius: 100px;
  font-size: .8rem;
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 24px;
}
.hero-badge .badge-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--success);
  animation: pulse-dot 2s infinite;
}
@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: .5; transform: scale(1.3); }
}
.hero h1 {
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 20px;
  letter-spacing: -.03em;
}
.hero h1 .gradient-text {
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent2) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-desc {
  font-size: 1.15rem;
  color: var(--text-secondary);
  max-width: 580px;
  margin: 0 auto 32px;
  line-height: 1.7;
}
.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}
.hero-stats {
  display: flex;
  justify-content: center;
  gap: 40px;
  margin-top: 48px;
  padding-top: 32px;
  border-top: 1px solid var(--border);
}
.hero-stat { text-align: center; }
.hero-stat .stat-value {
  display: block;
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--accent);
  letter-spacing: -.02em;
}
.hero-stat .stat-label {
  font-size: .82rem;
  color: var(--muted);
  font-weight: 500;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 28px;
  font-size: .9rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  transition: all var(--transition);
  border: 1px solid transparent;
  white-space: nowrap;
}
.btn-primary {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
  box-shadow: 0 1px 2px rgba(79,70,229,.3);
}
.btn-primary:hover {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
  color: #fff;
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(79,70,229,.35);
}
.btn-secondary {
  background: var(--card);
  color: var(--text);
  border: 1px solid var(--border);
}
.btn-secondary:hover {
  background: var(--bg-alt);
  color: var(--text);
  border-color: var(--border-hover);
}
.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
}
.btn-ghost:hover { background: var(--accent-light); color: var(--accent); }
.btn-accent2 { background: var(--accent2); color: #fff; border-color: var(--accent2); }
.btn-accent2:hover { background: var(--accent2-hover); color: #fff; border-color: var(--accent2-hover); }
.btn-sm { padding: 8px 18px; font-size: .82rem; }
.btn-lg { padding: 14px 36px; font-size: 1rem; border-radius: var(--radius); }
.btn-block { width: 100%; }

/* ---------- Cards ---------- */
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  transition: all var(--transition);
  position: relative;
}
.card::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: var(--radius);
  opacity: 0;
  transition: opacity var(--transition);
  box-shadow: var(--shadow-lg);
  pointer-events: none;
}
.card:hover { transform: translateY(-3px); border-color: var(--border-hover); }
.card:hover::after { opacity: 1; }
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(270px, 1fr));
  gap: 20px;
}

/* Level Cards */
.level-card {
  text-align: center;
  padding: 36px 28px;
  overflow: hidden;
}
.level-card .level-icon {
  width: 64px;
  height: 64px;
  border-radius: 16px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  font-weight: 800;
  margin-bottom: 20px;
  position: relative;
}
.level-card .level-icon::after {
  content: "";
  position: absolute;
  inset: -3px;
  border-radius: 19px;
  opacity: .3;
}
.level-a1 .level-icon { background: #ecfdf5; color: #059669; }
.level-a1 .level-icon::after { box-shadow: 0 0 20px #10b981; }
.level-a2 .level-icon { background: #eff6ff; color: #2563eb; }
.level-a2 .level-icon::after { box-shadow: 0 0 20px #3b82f6; }
.level-b1 .level-icon { background: #fffbeb; color: #d97706; }
.level-b1 .level-icon::after { box-shadow: 0 0 20px #f59e0b; }
.level-b2 .level-icon { background: #fef2f2; color: #dc2626; }
.level-b2 .level-icon::after { box-shadow: 0 0 20px #ef4444; }

[data-theme="dark"] .level-a1 .level-icon { background: rgba(16,185,129,.15); }
[data-theme="dark"] .level-a2 .level-icon { background: rgba(59,130,246,.15); }
[data-theme="dark"] .level-b1 .level-icon { background: rgba(245,158,11,.15); }
[data-theme="dark"] .level-b2 .level-icon { background: rgba(239,68,68,.15); }

.level-card h3 { font-size: 1.1rem; font-weight: 700; margin-bottom: 8px; }
.level-card p { font-size: .85rem; color: var(--text-secondary); margin-bottom: 20px; line-height: 1.6; }
.level-card .level-meta {
  display: flex;
  justify-content: center;
  gap: 16px;
  font-size: .78rem;
  color: var(--muted);
  margin-bottom: 20px;
}

/* Old level-badge compat */
.level-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 56px; height: 56px;
  border-radius: 50%;
  font-size: 1.1rem;
  font-weight: 800;
  margin-bottom: 16px;
}
.level-a1 .level-badge { background: #ecfdf5; color: #059669; }
.level-a2 .level-badge { background: #eff6ff; color: #2563eb; }
.level-b1 .level-badge { background: #fffbeb; color: #d97706; }
.level-b2 .level-badge { background: #fef2f2; color: #dc2626; }

/* ---------- Badge ---------- */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 4px 12px;
  font-size: .72rem;
  font-weight: 700;
  border-radius: 100px;
  letter-spacing: .3px;
  text-transform: uppercase;
}
.badge-a1 { background: #ecfdf5; color: #059669; }
.badge-a2 { background: #eff6ff; color: #2563eb; }
.badge-b1 { background: #fffbeb; color: #d97706; }
.badge-b2 { background: #fef2f2; color: #dc2626; }
[data-theme="dark"] .badge-a1 { background: rgba(16,185,129,.15); }
[data-theme="dark"] .badge-a2 { background: rgba(59,130,246,.15); }
[data-theme="dark"] .badge-b1 { background: rgba(245,158,11,.15); }
[data-theme="dark"] .badge-b2 { background: rgba(239,68,68,.15); }

/* ---------- Section ---------- */
.section { padding: 64px 0; }
.section-alt { background: var(--bg-alt); }
.section-header {
  text-align: center;
  margin-bottom: 40px;
}
.section-label {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: .78rem;
  font-weight: 700;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: .08em;
  margin-bottom: 12px;
}
.section-title {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 800;
  letter-spacing: -.02em;
  margin-bottom: 12px;
}
.section-subtitle {
  font-size: 1rem;
  color: var(--text-secondary);
  max-width: 520px;
  margin: 0 auto;
  line-height: 1.7;
}

/* ---------- Tool / Form Area ---------- */
.tool-section { padding: 48px 0 72px; }
.tool-panel {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 36px;
  max-width: 640px;
  margin: 0 auto;
  box-shadow: var(--shadow-md);
}
.form-group { margin-bottom: 24px; }
.form-group > label {
  display: block;
  font-size: .82rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: .04em;
}
.radio-group { display: flex; flex-wrap: wrap; gap: 8px; }
.radio-group label {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 20px;
  border: 2px solid var(--border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: .88rem;
  font-weight: 600;
  transition: all var(--transition);
  margin-bottom: 0;
}
.radio-group input { display: none; }
.radio-group label:has(input:checked) {
  border-color: var(--accent);
  background: var(--accent-light);
  color: var(--accent);
  box-shadow: 0 0 0 1px var(--accent);
}
.radio-group label:hover { border-color: var(--border-hover); }

.toggle-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 0;
  border-bottom: 1px solid var(--border);
}
.toggle-row:last-child { border-bottom: none; }
.toggle-label { font-size: .88rem; }
.toggle-switch { position: relative; width: 46px; height: 26px; flex-shrink: 0; }
.toggle-switch input { opacity: 0; width: 0; height: 0; }
.toggle-slider {
  position: absolute; inset: 0;
  background: var(--border);
  border-radius: 26px;
  cursor: pointer;
  transition: var(--transition);
}
.toggle-slider::before {
  content: "";
  position: absolute;
  width: 20px; height: 20px;
  border-radius: 50%;
  background: #fff;
  top: 3px; left: 3px;
  transition: var(--transition);
  box-shadow: var(--shadow-xs);
}
.toggle-switch input:checked + .toggle-slider { background: var(--accent); }
.toggle-switch input:checked + .toggle-slider::before { transform: translateX(20px); }

/* ---------- Quiz UI ---------- */
.quiz-container { max-width: 720px; margin: 0 auto; padding: 40px 0 72px; }
.quiz-header { margin-bottom: 28px; }
.progress-bar-wrap {
  width: 100%; height: 6px;
  background: var(--bg-alt);
  border-radius: 6px;
  overflow: hidden;
  margin-bottom: 12px;
}
.progress-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  border-radius: 6px;
  transition: width .4s cubic-bezier(.4,0,.2,1);
}
.progress-text { font-size: .82rem; color: var(--muted); text-align: right; font-weight: 500; }

.question-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 36px;
  box-shadow: var(--shadow-md);
  margin-bottom: 24px;
}
.question-card .q-number {
  font-size: .75rem;
  font-weight: 700;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: .05em;
  margin-bottom: 14px;
}
.question-card .q-text {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 8px;
  line-height: 1.5;
}
.question-card .reading-passage {
  background: var(--bg-alt);
  border-left: 4px solid var(--accent);
  padding: 20px 24px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin-bottom: 24px;
  font-size: .92rem;
  line-height: 1.8;
  color: var(--text-secondary);
}

.choices { display: flex; flex-direction: column; gap: 10px; margin-top: 20px; }
.choice-btn {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 16px 20px;
  border: 2px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--card);
  cursor: pointer;
  transition: all var(--transition);
  text-align: left;
  font-size: .92rem;
  line-height: 1.5;
}
.choice-btn:hover { border-color: var(--accent); background: var(--accent-light); }
.choice-btn .choice-letter {
  flex-shrink: 0;
  width: 32px; height: 32px;
  border-radius: 8px;
  background: var(--bg-alt);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: .82rem;
  transition: all var(--transition);
}
.choice-btn.selected { border-color: var(--accent); background: var(--accent-light); }
.choice-btn.selected .choice-letter { background: var(--accent); color: #fff; }
.choice-btn.correct { border-color: var(--success); background: var(--success-bg); }
.choice-btn.correct .choice-letter { background: var(--success); color: #fff; }
.choice-btn.wrong { border-color: var(--danger); background: var(--danger-bg); }
.choice-btn.wrong .choice-letter { background: var(--danger); color: #fff; }
.choice-btn.disabled { pointer-events: none; opacity: .85; }

.explanation-box {
  margin-top: 16px;
  padding: 16px 20px;
  background: var(--info-bg);
  border: 1px solid var(--info-border);
  border-left: 4px solid var(--info);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-size: .88rem;
  line-height: 1.7;
  display: none;
}
.explanation-box.show { display: block; }
.quiz-nav { display: flex; justify-content: space-between; gap: 12px; }

/* ---------- Results ---------- */
.results-card { text-align: center; padding: 48px 36px; }
.results-card .score-circle {
  width: 150px; height: 150px;
  border-radius: 50%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  margin: 0 auto 28px;
  font-size: 2.2rem;
  font-weight: 800;
  letter-spacing: -.02em;
}
.score-great { background: var(--success-bg); color: var(--success); border: 3px solid var(--success-border); }
.score-good { background: var(--info-bg); color: var(--info); border: 3px solid var(--info-border); }
.score-ok { background: var(--warning-bg); color: var(--warning); border: 3px solid var(--warning-border); }
.score-low { background: var(--danger-bg); color: var(--danger); border: 3px solid var(--danger-border); }
.score-circle small { font-size: .72rem; font-weight: 600; }
.results-card h2 { font-size: 1.4rem; margin-bottom: 8px; }
.results-card .results-detail { font-size: .95rem; color: var(--text-secondary); margin-bottom: 28px; }
.results-actions { display: flex; flex-wrap: wrap; justify-content: center; gap: 12px; margin-bottom: 36px; }
.review-list { text-align: left; }
.review-list h3 { font-size: 1.1rem; font-weight: 700; margin-bottom: 16px; }
.review-item {
  display: flex;
  gap: 14px;
  padding: 16px 0;
  border-bottom: 1px solid var(--border);
}
.review-item:last-child { border-bottom: none; }
.review-icon { flex-shrink: 0; font-size: 1.2rem; margin-top: 2px; }
.review-content { flex: 1; }
.review-content .q-label { font-weight: 600; font-size: .88rem; }
.review-content .q-answer { font-size: .82rem; color: var(--text-secondary); margin-top: 4px; }
.recommended-topics {
  margin-top: 36px;
  text-align: left;
  background: var(--bg-alt);
  border-radius: var(--radius);
  padding: 28px;
  border: 1px solid var(--border);
}
.recommended-topics h3 { font-size: 1rem; margin-bottom: 14px; font-weight: 700; }
.recommended-topics ul { display: flex; flex-direction: column; gap: 8px; }
.recommended-topics li a {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  font-size: .88rem;
  transition: background var(--transition);
}
.recommended-topics li a:hover { background: var(--card); }

/* ---------- Topic Page ---------- */
.topic-header { padding: 48px 0 28px; border-bottom: 1px solid var(--border); margin-bottom: 36px; }
.topic-header .badge { margin-bottom: 12px; }
.topic-header h1 { font-size: 1.8rem; font-weight: 800; margin-bottom: 8px; letter-spacing: -.02em; }
.topic-header .topic-meta { font-size: .88rem; color: var(--muted); }
.topic-content { max-width: 760px; }
.topic-content h2 { font-size: 1.3rem; font-weight: 700; margin-top: 36px; margin-bottom: 14px; }
.topic-content h3 { font-size: 1.1rem; font-weight: 600; margin-top: 28px; margin-bottom: 12px; }
.topic-content p { margin-bottom: 16px; line-height: 1.8; }
.topic-content ul, .topic-content ol { margin-bottom: 16px; padding-left: 24px; }
.topic-content ul { list-style: disc; }
.topic-content ol { list-style: decimal; }
.topic-content li { margin-bottom: 8px; line-height: 1.7; }
.topic-content .example-box {
  background: var(--accent-light);
  border-left: 4px solid var(--accent);
  padding: 18px 22px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin: 18px 0;
  font-size: .92rem;
}
.topic-content .example-box strong { color: var(--accent); }
.topic-content .warning-box {
  background: var(--danger-bg);
  border-left: 4px solid var(--danger);
  border: 1px solid var(--danger-border);
  border-left-width: 4px;
  padding: 18px 22px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin: 18px 0;
  font-size: .92rem;
}
.topic-content .tip-box {
  background: var(--success-bg);
  border-left: 4px solid var(--success);
  border: 1px solid var(--success-border);
  border-left-width: 4px;
  padding: 18px 22px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin: 18px 0;
  font-size: .92rem;
}

.mini-practice {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  margin: 28px 0;
  box-shadow: var(--shadow);
}
.mini-practice h3 { font-size: 1rem; margin-bottom: 18px; font-weight: 700; }
.practice-item { margin-bottom: 18px; }
.practice-item .pq { font-weight: 600; margin-bottom: 8px; font-size: .92rem; }
.practice-item .pa {
  display: none;
  padding: 12px 16px;
  background: var(--success-bg);
  border: 1px solid var(--success-border);
  border-radius: var(--radius-sm);
  font-size: .88rem;
  margin-top: 8px;
}
.practice-item .pa.show { display: block; }
.reveal-btn {
  font-size: .82rem;
  color: var(--accent);
  font-weight: 600;
  cursor: pointer;
  padding: 6px 0;
}
.reveal-btn:hover { text-decoration: underline; }

/* ---------- Breadcrumb ---------- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 4px;
  padding: 16px 0;
  font-size: .82rem;
}
.breadcrumb a { color: var(--muted); }
.breadcrumb a:hover { color: var(--accent); }
.breadcrumb .sep { color: var(--muted); margin: 0 4px; }
.breadcrumb .current { color: var(--text-secondary); font-weight: 500; }

/* ---------- Accordion ---------- */
.accordion { max-width: 760px; margin: 0 auto; }
.accordion-item {
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  margin-bottom: 8px;
  overflow: hidden;
}
.accordion-trigger {
  width: 100%;
  padding: 18px 22px;
  text-align: left;
  font-size: .92rem;
  font-weight: 600;
  background: var(--card);
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: background var(--transition);
}
.accordion-trigger:hover { background: var(--bg-alt); }
.accordion-trigger .arrow { transition: transform var(--transition); font-size: .8rem; }
.accordion-item.open .accordion-trigger .arrow { transform: rotate(180deg); }
.accordion-content { max-height: 0; overflow: hidden; transition: max-height .3s ease; }
.accordion-content-inner {
  padding: 0 22px 20px;
  font-size: .9rem;
  line-height: 1.7;
  color: var(--text-secondary);
}

/* ---------- Search ---------- */
.search-section { padding: 48px 0 72px; }
.search-box { max-width: 560px; margin: 0 auto 28px; position: relative; }
.search-box input {
  width: 100%;
  padding: 16px 22px 16px 50px;
  border: 2px solid var(--border);
  border-radius: var(--radius);
  font-size: 1rem;
  background: var(--card);
  transition: all var(--transition);
  box-shadow: var(--shadow);
}
.search-box input:focus { outline: none; border-color: var(--accent); box-shadow: var(--glow-accent); }
.search-box .search-icon {
  position: absolute;
  left: 18px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--muted);
  font-size: 1.1rem;
}
.filter-chips { display: flex; justify-content: center; gap: 8px; margin-bottom: 28px; }
.chip {
  padding: 8px 18px;
  border-radius: 100px;
  font-size: .82rem;
  font-weight: 600;
  border: 1px solid var(--border);
  background: var(--card);
  cursor: pointer;
  transition: all var(--transition);
}
.chip:hover, .chip.active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}
.search-results { max-width: 640px; margin: 0 auto; }
.search-result-item { padding: 18px 0; border-bottom: 1px solid var(--border); }
.search-result-item h3 { font-size: 1rem; margin-bottom: 4px; }
.search-result-item h3 a { color: var(--text); }
.search-result-item h3 a:hover { color: var(--accent); }
.search-result-item p { font-size: .85rem; color: var(--text-secondary); }
.search-result-item .result-type {
  font-size: .72rem;
  color: var(--accent);
  font-weight: 700;
  margin-bottom: 4px;
  text-transform: uppercase;
  letter-spacing: .04em;
}

/* ---------- Ad Blocks ---------- */
.ad-block { text-align: center; padding: 16px 0; min-height: 100px; }
.ad-block ins { display: block; }
.ad-in-article { margin: 2rem 0; padding: 1.5rem 0; border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.ad-multiplex { margin-top: 2rem; padding: 1.5rem 0; }
.ad-block:empty { display: none; }

/* ---------- Preset Links ---------- */
.preset-links {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
}
.preset-link-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 22px;
  transition: all var(--transition);
  display: block;
}
.preset-link-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
  border-color: var(--accent);
}
.preset-link-card h3 { font-size: .92rem; font-weight: 600; margin-bottom: 6px; color: var(--text); }
.preset-link-card p { font-size: .8rem; color: var(--text-secondary); margin-bottom: 14px; line-height: 1.5; }

/* ---------- CTA Banner ---------- */
.cta-banner {
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent2) 100%);
  border-radius: var(--radius);
  padding: 48px 36px;
  text-align: center;
  color: #fff;
  margin: 48px 0;
  position: relative;
  overflow: hidden;
}
.cta-banner::before {
  content: "";
  position: absolute;
  top: -50%; right: -20%;
  width: 300px; height: 300px;
  border-radius: 50%;
  background: rgba(255,255,255,.08);
}
.cta-banner::after {
  content: "";
  position: absolute;
  bottom: -40%; left: -15%;
  width: 250px; height: 250px;
  border-radius: 50%;
  background: rgba(255,255,255,.05);
}
.cta-banner h2 { font-size: 1.5rem; margin-bottom: 10px; position: relative; z-index: 1; }
.cta-banner p { opacity: .9; margin-bottom: 24px; font-size: .95rem; position: relative; z-index: 1; }
.cta-banner .btn {
  background: #fff;
  color: var(--accent);
  position: relative;
  z-index: 1;
  border: none;
}
.cta-banner .btn:hover { background: #f0f0f0; color: var(--accent); transform: translateY(-1px); }

/* ---------- Features Grid (homepage) ---------- */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.feature-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 28px;
  transition: all var(--transition);
}
.feature-card:hover { box-shadow: var(--shadow-md); transform: translateY(-2px); }
.feature-icon {
  width: 48px; height: 48px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  margin-bottom: 18px;
}
.feature-card h3 { font-size: 1rem; font-weight: 700; margin-bottom: 8px; }
.feature-card p { font-size: .85rem; color: var(--text-secondary); line-height: 1.6; }

/* ---------- Footer ---------- */
.site-footer {
  margin-top: auto;
  background: var(--card);
  border-top: 1px solid var(--border);
  padding: 56px 0 28px;
}
.footer-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 48px;
  margin-bottom: 40px;
  flex-wrap: wrap;
}
.footer-brand { max-width: 280px; }
.footer-brand .logo { margin-bottom: 14px; }
.footer-brand p { font-size: .85rem; color: var(--text-secondary); line-height: 1.7; }
.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 36px;
  margin-bottom: 36px;
}
.footer-col h4 {
  font-size: .78rem;
  font-weight: 700;
  margin-bottom: 14px;
  color: var(--text);
  text-transform: uppercase;
  letter-spacing: .05em;
}
.footer-col a {
  display: block;
  font-size: .85rem;
  color: var(--text-secondary);
  padding: 5px 0;
  transition: color var(--transition);
}
.footer-col a:hover { color: var(--accent); }
.footer-bottom {
  text-align: center;
  padding-top: 24px;
  border-top: 1px solid var(--border);
  font-size: .8rem;
  color: var(--muted);
}

/* ---------- Page Content (Generic) ---------- */
.page-header {
  padding: 48px 0 28px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 36px;
}
.page-header h1 { font-size: 1.8rem; font-weight: 800; margin-bottom: 8px; letter-spacing: -.02em; }
.page-header p { color: var(--text-secondary); font-size: .95rem; }
.page-content { max-width: 760px; padding-bottom: 56px; }
.page-content h2 { font-size: 1.3rem; font-weight: 700; margin: 32px 0 14px; }
.page-content h3 { font-size: 1.1rem; font-weight: 600; margin: 24px 0 12px; }
.page-content p { margin-bottom: 16px; line-height: 1.8; }
.page-content ul, .page-content ol { padding-left: 24px; margin-bottom: 16px; }
.page-content ul { list-style: disc; }
.page-content ol { list-style: decimal; }
.page-content li { margin-bottom: 8px; line-height: 1.7; }

/* ---------- Toast ---------- */
.toast {
  position: fixed;
  bottom: 28px;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background: var(--text);
  color: var(--bg);
  padding: 14px 28px;
  border-radius: var(--radius-sm);
  font-size: .88rem;
  font-weight: 600;
  z-index: 1000;
  opacity: 0;
  transition: all .3s cubic-bezier(.4,0,.2,1);
  pointer-events: none;
  box-shadow: var(--shadow-lg);
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* ---------- Cookie Banner ---------- */
.cookie-banner {
  position: fixed;
  bottom: 0; left: 0; right: 0;
  background: var(--card);
  border-top: 1px solid var(--border);
  padding: 18px 24px;
  z-index: 200;
  display: none;
  box-shadow: 0 -4px 30px rgba(0,0,0,.1);
}
.cookie-banner.show { display: flex; align-items: center; justify-content: center; gap: 18px; flex-wrap: wrap; }
.cookie-banner p { font-size: .85rem; color: var(--text-secondary); }
.cookie-banner p a { text-decoration: underline; }

/* ---------- Print ---------- */
@media print {
  .site-header, .site-footer, .ad-block, .cookie-banner, .quiz-nav,
  .tool-panel, .theme-toggle, .nav-toggle { display: none !important; }
  body { background: #fff; color: #000; }
  .results-card { box-shadow: none; border: 1px solid #ccc; }
  .review-item { page-break-inside: avoid; }
}

/* ---------- Responsive ---------- */
@media (max-width: 768px) {
  .features-grid { grid-template-columns: 1fr; }
  .hero-stats { gap: 24px; flex-wrap: wrap; }
  .hero h1 { font-size: 1.8rem; }
  .hero-desc { font-size: 1rem; }
  .footer-top { flex-direction: column; }
}
@media (max-width: 640px) {
  .card-grid { grid-template-columns: 1fr; }
  .tool-panel { padding: 24px 18px; }
  .question-card { padding: 24px 18px; }
  .results-card { padding: 32px 18px; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .preset-links { grid-template-columns: 1fr; }
  .cta-banner { padding: 36px 24px; }
}