/* ---------- Design tokens ---------- */
:root {
  --ink: #17140f;
  --ink-secondary: #55503f;
  --ink-muted: #948c78;
  --surface: #ffffff;
  --surface-sunken: #f7f5f0;
  --surface-card: #ffffff;
  --surface-hover: rgba(154, 122, 31, 0.06);
  --tint-primary: rgba(154, 122, 31, 0.10);
  --border: #e9e4d8;
  --border-strong: #d9d0ba;
  --primary: #9c7a1f;
  --primary-ink: #17140f;
  --primary-hover: #7e621a;
  --gold-bright: #d4af37;
  --black: #0d0d0d;
  --on-dark: #ece6d6;
  --on-dark-muted: rgba(236, 230, 214, 0.68);
  --success: #1f7a4d;
  --success-bg: rgba(31, 122, 77, 0.12);
  --danger: #a3312a;
  --danger-bg: rgba(163, 49, 42, 0.12);
  --radius: 10px;
  --radius-sm: 6px;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08), 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 12px 28px rgba(0, 0, 0, 0.16);
  --max-width: 1080px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-display: "Playfair Display", Georgia, "Times New Roman", serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font);
  color: var(--ink);
  background: var(--surface-sunken);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}
h1, h2, h3, h4 { line-height: 1.15; margin: 0 0 0.5em; font-weight: 700; letter-spacing: -0.01em; font-family: var(--font-display); }
h1 { font-size: 2.1rem; }
h2 { font-size: 1.5rem; }
h3 { font-size: 1.1rem; font-family: var(--font); font-weight: 800; }
p { margin: 0 0 1em; }

/* ---------- Poster-style decorations ---------- */
.highlight-box {
  display: inline-block; background: var(--black); color: var(--gold-bright);
  padding: 2px 14px; border-radius: 4px; border: 1px solid rgba(212, 175, 55, 0.45);
}
.dotted-grid {
  position: absolute; width: 64px; height: 64px;
  background-image: radial-gradient(rgba(154, 122, 31, 0.35) 1.6px, transparent 1.6px);
  background-size: 12px 12px; opacity: 0.7; pointer-events: none;
}
.sticker-star { position: absolute; pointer-events: none; color: var(--gold-bright); }
.icon-line { width: 22px; height: 22px; stroke: currentColor; fill: none; stroke-width: 1.6; stroke-linecap: round; stroke-linejoin: round; }
.dashed-divider { border: none; border-top: 1px dashed var(--border-strong); margin: 40px 0; }

/* Reusable icon badge -- circle with a line icon, tinted by --track-color when set */
.icon-badge {
  width: 44px; height: 44px; border-radius: 50%; flex-shrink: 0;
  background: var(--tint-primary); color: var(--track-color, var(--primary));
  display: flex; align-items: center; justify-content: center;
  border: 1px solid rgba(154, 122, 31, 0.18);
}
.icon-badge .icon-line { width: 22px; height: 22px; }
.icon-badge-sm { width: 32px; height: 32px; }
.icon-badge-sm .icon-line { width: 16px; height: 16px; }
.icon-badge-dark { background: var(--black); color: var(--gold-bright); border-color: transparent; }
.icon-badge-center { margin: 0 auto 14px; }

/* Small uppercase pill label, poster-sticker style */
.poster-tag {
  display: inline-flex; align-items: center; gap: 6px;
  background: var(--black); color: var(--gold-bright);
  padding: 4px 12px; border-radius: 999px; font-size: 0.7rem;
  font-weight: 800; text-transform: uppercase; letter-spacing: 0.06em;
}
.section-head-icon { display: flex; align-items: center; gap: 10px; }
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }
.muted { color: var(--ink-secondary); }
ul { padding-left: 1.2em; }
.container { max-width: var(--max-width); margin: 0 auto; padding: 0 20px; }

/* ---------- Header ---------- */
.site-header {
  background: var(--black);
  border-bottom: 1px solid rgba(212, 175, 55, 0.25);
  position: sticky; top: 0; z-index: 20;
}
.header-inner {
  display: flex; align-items: center; gap: 24px;
  height: 64px;
}
.brand {
  font-weight: 700; font-size: 1.15rem; color: var(--on-dark);
  font-family: var(--font-display);
  display: flex; align-items: center; gap: 8px; white-space: nowrap;
}
.brand:hover { text-decoration: none; }
.brand-mark { font-size: 1.2rem; }
.main-nav { display: flex; gap: 4px; flex: 1; }
.nav-link {
  color: var(--gold-bright); font-weight: 600; font-size: 0.92rem;
  padding: 8px 12px; border-radius: 999px;
}
.nav-link:hover { background: rgba(212, 175, 55, 0.14); text-decoration: none; color: #e9c766; }
.auth-area { display: flex; align-items: center; gap: 10px; white-space: nowrap; }
.user-greeting { color: var(--on-dark-muted); font-size: 0.9rem; }
.lock-icon { font-size: 0.72em; opacity: 0.75; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  border-radius: 4px; font-weight: 600; cursor: pointer; border: none;
  padding: 10px 18px; font-size: 0.95rem; transition: all 0.12s ease;
}
.btn-primary { background: var(--gold-bright); color: var(--black); font-weight: 700; }
.btn-primary:hover { background: #e2bd52; text-decoration: none; }
.btn-ghost { background: transparent; color: var(--ink); border: 1px solid var(--border-strong); }
.btn-ghost:hover { background: var(--surface-hover); border-color: var(--primary); text-decoration: none; }
.btn-large { padding: 14px 26px; font-size: 1.02rem; }
.btn-small { padding: 6px 14px; font-size: 0.85rem; }
.site-header .btn-ghost { color: var(--on-dark); border-color: rgba(236, 230, 214, 0.35); }
.site-header .btn-ghost:hover { background: rgba(212, 175, 55, 0.1); border-color: var(--gold-bright); color: var(--gold-bright); }

/* ---------- Flash messages ---------- */
.flash-stack { margin: 20px 0 0; display: flex; flex-direction: column; gap: 8px; }
.flash { padding: 12px 16px; border-radius: var(--radius-sm); font-size: 0.92rem; font-weight: 500; }
.flash-error { background: var(--danger-bg); color: var(--danger); }
.flash-success { background: var(--success-bg); color: var(--success); }

/* ---------- Layout ---------- */
.page { padding: 32px 20px 64px; }

/* ---------- Hero ---------- */
.hero-split {
  position: relative;
  display: grid; grid-template-columns: minmax(0, 1fr) minmax(280px, 380px);
  align-items: center; gap: 32px; padding: 48px 12px 16px; max-width: 1080px; margin: 0 auto;
}
.hero-copy { text-align: left; }
.hero-sub { color: var(--ink-secondary); font-size: 1.08rem; max-width: 540px; margin: 0 0 28px; }
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; }
.hero-art { display: flex; align-items: center; justify-content: center; }
.hero-art svg { width: 100%; height: auto; max-width: 340px; }

/* legacy single-column hero (still used when there's no illustration) */
.hero { text-align: center; padding: 56px 12px 20px; max-width: 720px; margin: 0 auto; }

.stats-strip { display: flex; justify-content: center; gap: 40px; padding: 24px 0 48px; flex-wrap: wrap; }
.stat-chip { text-align: center; }
.stat-chip strong { display: block; font-size: 1.8rem; color: var(--primary); }
.stat-chip span { color: var(--ink-secondary); font-size: 0.85rem; }

/* ---------- Track grid / cards ---------- */
.track-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 20px; margin-bottom: 56px; }
.track-card {
  background: var(--surface-card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 24px; box-shadow: var(--shadow-sm); color: var(--ink);
  border-top: 4px solid var(--track-color, var(--primary));
  transition: transform 0.12s ease, box-shadow 0.12s ease;
  display: flex; flex-direction: column; gap: 10px;
}
.track-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); text-decoration: none; }
.track-card h2 { color: var(--ink); margin-bottom: 2px; }
.track-card p { color: var(--ink-secondary); margin-bottom: 8px; font-size: 0.92rem; }
.domain-chip-list { list-style: none; padding: 0; margin: 0 0 8px; display: flex; flex-direction: column; gap: 4px; }
.domain-chip { font-size: 0.78rem; color: var(--ink-secondary); background: var(--tint-primary); padding: 4px 10px; border-radius: 999px; display: inline-block; }
.track-card-cta { font-weight: 700; color: var(--track-color, var(--primary)); font-size: 0.92rem; }

/* ---------- Topic strip ---------- */
.topic-strip { padding: 8px 0 32px; }
.topic-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(120px, 1fr)); gap: 18px; text-align: center; }
.topic-item { display: flex; flex-direction: column; align-items: center; gap: 8px; }
.topic-icon {
  width: 56px; height: 56px; border-radius: 50%; background: var(--surface-card);
  border: 1.5px solid var(--border-strong); display: flex; align-items: center; justify-content: center;
  color: var(--ink);
}
.topic-item span { font-size: 0.72rem; font-weight: 800; text-transform: uppercase; letter-spacing: 0.03em; color: var(--ink-secondary); }

/* ---------- How it works ---------- */
.how-it-works { padding: 24px 0 40px; }
.how-it-works h2 { text-align: center; margin-bottom: 24px; }
.how-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 20px; }
.how-card { background: var(--surface-card); border: 1px solid var(--border); border-radius: var(--radius); padding: 22px; display: flex; flex-direction: column; gap: 4px; }
.how-card-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 12px; }
.how-num {
  width: 30px; height: 30px; border-radius: 50%; background: var(--black); color: var(--gold-bright);
  display: flex; align-items: center; justify-content: center; font-weight: 700; font-family: var(--font-display); font-size: 0.9rem;
}
.how-icon {
  width: 40px; height: 40px; border-radius: 50%; background: var(--tint-primary);
  display: flex; align-items: center; justify-content: center; color: var(--primary);
}
.how-card p { color: var(--ink-secondary); font-size: 0.92rem; margin: 0; }

/* ---------- Auth ---------- */
.auth-form-wrap { position: relative; max-width: 400px; margin: 20px auto; background: var(--surface-card); border: 1px solid var(--border); border-radius: var(--radius); padding: 32px; box-shadow: var(--shadow-sm); }
.auth-form-wrap .icon-badge { margin: 0 0 16px; }
.stack-form { display: flex; flex-direction: column; gap: 16px; margin: 20px 0; }
.stack-form label { display: flex; flex-direction: column; gap: 6px; font-weight: 600; font-size: 0.9rem; color: var(--ink-secondary); }
.stack-form input, select, .quiz-setup-form input, .quiz-setup-form select {
  font-family: var(--font); font-size: 1rem; padding: 10px 12px; border-radius: var(--radius-sm);
  border: 1px solid var(--border-strong); color: var(--ink); background: var(--surface);
}
.stack-form input:focus, select:focus { outline: 2px solid var(--primary); outline-offset: 1px; }

/* ---------- Track hero + progress ---------- */
.track-hero { position: relative; text-align: center; padding: 40px 12px 8px; max-width: 700px; margin: 0 auto; }
.eyebrow { text-transform: uppercase; letter-spacing: 0.08em; font-size: 0.75rem; font-weight: 700; color: var(--track-color, var(--primary)); margin-bottom: 6px; }

.progress-summary {
  background: var(--surface-card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 28px; margin: 32px 0; box-shadow: var(--shadow-sm);
  display: flex; flex-direction: column; gap: 24px;
}
.progress-summary-main { display: flex; align-items: center; gap: 32px; flex-wrap: wrap; }
.ring-stat { text-align: center; }
.ring-stat p { margin: 8px 0 0; font-size: 0.85rem; color: var(--ink-secondary); font-weight: 600; }
.ring {
  --size: 96px; width: var(--size); height: var(--size); border-radius: 50%;
  background: conic-gradient(var(--track-color, var(--primary)) calc(var(--pct, 0) * 1%), var(--surface-sunken) 0);
  display: flex; align-items: center; justify-content: center; position: relative;
}
.ring::before { content: ""; position: absolute; inset: 8px; border-radius: 50%; background: var(--surface-card); }
.ring span { position: relative; font-weight: 800; font-size: 1.15rem; color: var(--ink); }
.progress-summary-facts p { margin: 0 0 6px; font-size: 0.92rem; }
.domain-bars { display: flex; flex-direction: column; gap: 10px; border-top: 1px solid var(--border); padding-top: 20px; }
.domain-bar-row { display: grid; grid-template-columns: minmax(120px, 220px) 1fr 44px; gap: 12px; align-items: center; }
.domain-bar-label { font-size: 0.86rem; color: var(--ink-secondary); font-weight: 600; }
.domain-bar-track, .bar-track { background: var(--surface-sunken); border-radius: 999px; height: 8px; overflow: hidden; }
.domain-bar-fill, .bar-fill { background: var(--track-color, var(--primary)); height: 100%; border-radius: 999px; }
.domain-bar-pct { font-size: 0.85rem; font-weight: 700; color: var(--ink); text-align: right; }

.cta-banner { background: var(--surface-card); border: 1px dashed var(--border-strong); border-radius: var(--radius); padding: 18px 22px; margin: 28px 0; text-align: center; }

/* ---------- Study index ---------- */
.study-index { margin-top: 40px; }
.domain-block { margin-bottom: 28px; }
.domain-block h3 { display: flex; align-items: center; gap: 10px; }
.weight-tag { font-size: 0.72rem; font-weight: 700; color: var(--ink-muted); background: var(--tint-primary); padding: 3px 9px; border-radius: 999px; }
.section-list { list-style: none; padding: 0; display: flex; flex-direction: column; gap: 2px; }
.section-list li a {
  display: flex; align-items: center; gap: 8px; padding: 12px 16px; border-radius: var(--radius-sm);
  color: var(--ink); background: var(--surface-card); border: 1px solid var(--border); font-weight: 500;
}
.section-list li a:hover { border-color: var(--border-strong); text-decoration: none; background: var(--surface-hover); }
.check-mark { color: var(--success); font-weight: 800; }

/* ---------- Breadcrumb ---------- */
.breadcrumb { display: flex; gap: 8px; color: var(--ink-muted); font-size: 0.85rem; margin-bottom: 20px; }
.breadcrumb a { color: var(--ink-secondary); }

/* ---------- Study article ---------- */
.study-article {
  background: var(--surface-card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 32px; box-shadow: var(--shadow-sm); max-width: 760px; margin: 0 auto;
}
.study-article-head { display: flex; align-items: flex-start; justify-content: space-between; gap: 16px; }
.study-body { color: var(--ink); font-size: 1rem; }
.study-body p { margin: 0 0 14px; }
.study-body ul { margin: 0 0 6px; padding-left: 1.3em; }
.study-body li { margin-bottom: 10px; }
.study-body strong { color: var(--ink); }
.study-pager { display: flex; justify-content: space-between; gap: 16px; max-width: 760px; margin: 24px auto 0; }
.pager-link { font-weight: 600; padding: 10px 16px; border-radius: var(--radius-sm); background: var(--surface-card); border: 1px solid var(--border); color: var(--ink); font-size: 0.9rem; }
.pager-link:hover { text-decoration: none; background: var(--surface-hover); }

/* ---------- Quiz setup ---------- */
.quiz-setup { position: relative; max-width: 640px; margin: 0 auto; }
.quiz-setup-head { display: flex; align-items: center; gap: 14px; }
.quiz-setup-form { display: flex; flex-direction: column; gap: 22px; margin-top: 24px; }
fieldset { border: none; padding: 0; margin: 0; }
legend { font-weight: 700; margin-bottom: 12px; padding: 0; }
.radio-card {
  display: flex; gap: 12px; align-items: flex-start; padding: 14px 16px; border: 1px solid var(--border);
  border-radius: var(--radius-sm); margin-bottom: 10px; cursor: pointer; background: var(--surface-card);
}
.radio-card:hover { border-color: var(--border-strong); }
.radio-card input { margin-top: 3px; }
.radio-card.disabled { opacity: 0.5; cursor: not-allowed; }
.radio-card small { color: var(--ink-secondary); }
.form-row { display: flex; flex-direction: column; gap: 6px; }
.form-row label { font-weight: 600; font-size: 0.9rem; color: var(--ink-secondary); display: flex; flex-direction: column; gap: 6px; }
.form-row input, .form-row select { max-width: 220px; }
.checkbox-row { flex-direction: row; align-items: center; gap: 24px; flex-wrap: wrap; }
.checkbox-label { display: flex; align-items: center; gap: 8px; font-weight: 600; color: var(--ink); cursor: pointer; }

/* ---------- Quiz take ---------- */
.quiz-take { max-width: 720px; margin: 0 auto; }
.quiz-take-header { display: flex; justify-content: space-between; align-items: center; gap: 16px; margin-bottom: 24px; flex-wrap: wrap; position: sticky; top: 64px; background: var(--surface-sunken); padding: 12px 0; z-index: 10; }
.timer-box { text-align: center; background: var(--surface-card); border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 8px 16px; }
.timer-box span { display: block; font-weight: 800; font-size: 1.3rem; }
.timer-box small { color: var(--ink-secondary); font-size: 0.72rem; }
.timer-box.timer-warning span { color: var(--danger); }
.timer-box.timer-expired span { color: var(--danger); }

.question-card {
  background: var(--surface-card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 22px 24px; margin-bottom: 16px; box-shadow: var(--shadow-sm);
}
.question-card legend { display: flex; align-items: center; gap: 10px; font-size: 0.82rem; color: var(--ink-muted); font-weight: 700; text-transform: uppercase; letter-spacing: 0.03em; }
.topic-tag { background: var(--tint-primary); color: var(--ink-secondary); font-size: 0.7rem; font-weight: 700; text-transform: none; letter-spacing: normal; padding: 3px 9px; border-radius: 999px; }
.question-text { font-size: 1.05rem; font-weight: 600; color: var(--ink); margin: 6px 0 16px; }
.choice-list { display: flex; flex-direction: column; gap: 8px; }
.choice-option {
  display: flex; align-items: center; gap: 10px; padding: 12px 14px; border: 1px solid var(--border);
  border-radius: var(--radius-sm); cursor: pointer; font-size: 0.95rem;
}
.choice-option:hover { border-color: var(--border-strong); background: var(--surface-hover); }
.choice-option input { accent-color: var(--primary); }

.quiz-submit-bar { display: flex; justify-content: space-between; align-items: center; margin: 24px 0 60px; gap: 16px; }

/* ---------- Quiz result ---------- */
.quiz-result-header {
  display: flex; gap: 28px; align-items: center; background: var(--surface-card);
  border: 1px solid var(--border); border-radius: var(--radius); padding: 28px; margin-bottom: 32px;
  flex-wrap: wrap; box-shadow: var(--shadow-sm);
}
.result-score { text-align: center; min-width: 140px; padding: 14px 20px; border-radius: var(--radius); }
.result-pass { background: var(--success-bg); }
.result-fail { background: var(--danger-bg); }
.result-pct { display: block; font-size: 2.4rem; font-weight: 800; }
.result-pass .result-pct { color: var(--success); }
.result-fail .result-pct { color: var(--danger); }
.result-frac { font-size: 0.85rem; color: var(--ink-secondary); font-weight: 600; }
.result-actions { display: flex; gap: 10px; margin-top: 12px; flex-wrap: wrap; }

.quiz-review { max-width: 760px; margin: 0 auto; }
.review-card { background: var(--surface-card); border: 1px solid var(--border); border-radius: var(--radius); padding: 22px; margin-bottom: 16px; }
.review-card.review-incorrect { border-left: 4px solid var(--danger); }
.review-card.review-correct { border-left: 4px solid var(--success); }
.review-badge {
  display: inline-block; font-size: 0.7rem; font-weight: 800; text-transform: uppercase; letter-spacing: 0.04em;
  padding: 3px 9px; border-radius: 999px; margin-right: 8px; vertical-align: middle;
}
.review-correct .review-badge { background: var(--success-bg); color: var(--success); }
.review-incorrect .review-badge { background: var(--danger-bg); color: var(--danger); }
.review-choices .choice-option { cursor: default; }
.review-choices .choice-option:hover { background: none; border-color: var(--border); }
.choice-correct { border-color: var(--success); background: var(--success-bg); }
.choice-wrong-selected { border-color: var(--danger); background: var(--danger-bg); }
.choice-flag { margin-left: auto; font-size: 0.75rem; font-weight: 700; }
.choice-correct .choice-flag { color: var(--success); }
.choice-wrong-selected .choice-flag { color: var(--danger); }
.explanation { margin-top: 14px; padding-top: 14px; border-top: 1px dashed var(--border); font-size: 0.92rem; color: var(--ink-secondary); }
.explanation strong { color: var(--ink); }

/* ---------- Dashboard ---------- */
.dashboard-head { position: relative; margin-bottom: 8px; }
.dashboard-head-row { display: flex; align-items: center; gap: 14px; }
.dashboard-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 18px; margin: 24px 0 40px; }
.dashboard-card { background: var(--surface-card); border: 1px solid var(--border); border-top: 4px solid var(--track-color, var(--primary)); border-radius: var(--radius); padding: 20px; box-shadow: var(--shadow-sm); }
.dashboard-card-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 4px; }
.dashboard-card-title { display: flex; align-items: center; gap: 10px; }
.dashboard-card-title h2 { margin: 0; }
.pct-badge { font-weight: 800; color: var(--track-color, var(--primary)); }
.bar-track { margin: 12px 0 16px; }
.dashboard-card-actions { display: flex; gap: 8px; flex-wrap: wrap; }

.recent-activity { margin-top: 20px; }
.activity-table { width: 100%; border-collapse: collapse; background: var(--surface-card); border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; }
.activity-table th, .activity-table td { text-align: left; padding: 12px 16px; border-bottom: 1px solid var(--border); font-size: 0.92rem; }
.activity-table th { color: var(--ink-muted); font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.04em; background: var(--tint-primary); }
.activity-table tr:last-child td { border-bottom: none; }

/* ---------- Flashcards ---------- */
.flashcards-wrap { position: relative; max-width: 640px; margin: 0 auto; }
.flashcards-head { text-align: center; padding: 8px 12px 4px; }
.flashcards-head h1 { margin-bottom: 6px; }
.flashcards-head p.muted { max-width: 440px; margin: 0 auto; }
.flashcards-filter { text-align: center; margin: 20px 0 0; }
.flashcards-filter label { display: inline-flex; align-items: center; gap: 8px; font-weight: 600; font-size: 0.85rem; color: var(--ink-secondary); }
.flashcards-filter select {
  font-family: var(--font); font-size: 0.9rem; padding: 8px 12px; border-radius: var(--radius-sm);
  border: 1px solid var(--border-strong); color: var(--ink); background: var(--surface);
}

.flashcard-stage { margin-top: 24px; }
.flashcard-progress { text-align: center; font-size: 0.85rem; font-weight: 700; color: var(--ink-secondary); margin-bottom: 12px; }
.flashcard { perspective: 1400px; cursor: pointer; height: 320px; }
.flashcard-inner {
  position: relative; width: 100%; height: 100%;
  transform-style: preserve-3d; transition: transform 0.5s cubic-bezier(0.2, 0.8, 0.2, 1);
}
.flashcard-inner.is-flipped { transform: rotateY(180deg); }
.flashcard-face {
  position: absolute; inset: 0; backface-visibility: hidden;
  background: var(--surface-card); border: 1px solid var(--border); border-radius: var(--radius);
  box-shadow: var(--shadow-md); display: flex; flex-direction: column; align-items: center; justify-content: center;
  text-align: center; padding: 32px; gap: 14px; border-top: 4px solid var(--track-color, var(--primary));
}
.flashcard-front p { font-size: 1.25rem; font-weight: 700; color: var(--ink); margin: 0; }
.flashcard-back { transform: rotateY(180deg); background: var(--tint-primary); }
.flashcard-answer { font-size: 1.35rem; font-weight: 800; color: var(--track-color, var(--primary)); margin: 0; }
.flashcard-explain { font-size: 0.9rem; color: var(--ink-secondary); margin: 0; }
.flashcard-hint { position: absolute; bottom: 14px; font-size: 0.68rem; text-transform: uppercase; letter-spacing: 0.06em; color: var(--ink-muted); }
.flashcard-controls { display: flex; justify-content: center; gap: 12px; margin-top: 24px; flex-wrap: wrap; }
.flashcard-controls .btn { min-width: 108px; }

@media (max-width: 720px) {
  .flashcard { height: 280px; }
  .flashcard-face { padding: 24px; }
}

/* ---------- Speed Challenge game ---------- */
.game-wrap { position: relative; max-width: 720px; margin: 0 auto; }
.game-hud { display: flex; justify-content: center; gap: 14px; margin-bottom: 24px; flex-wrap: wrap; }
.game-stat { text-align: center; background: var(--surface-card); border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 10px 24px; min-width: 90px; }
.game-stat .icon-badge-sm { margin: 0 auto 6px; }
.game-stat strong { display: block; font-size: 1.6rem; color: var(--ink); }
.game-stat span { font-size: 0.7rem; color: var(--ink-secondary); text-transform: uppercase; letter-spacing: 0.05em; }
.game-stat.game-timer.timer-warning strong { color: var(--danger); }
.game-start { text-align: center; padding: 48px 20px; }
.game-start p { max-width: 480px; margin: 0 auto 24px; color: var(--ink-secondary); }
.game-question-card { background: var(--surface-card); border: 1px solid var(--border); border-radius: var(--radius); padding: 30px; box-shadow: var(--shadow-sm); text-align: center; }
.game-question-text { font-size: 1.25rem; font-weight: 700; margin-bottom: 22px; }
.game-choices { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 10px; }
.game-choice { padding: 16px; border: 1px solid var(--border-strong); border-radius: var(--radius-sm); background: var(--surface); color: var(--ink); font-family: var(--font); font-size: 1rem; font-weight: 600; cursor: pointer; transition: all 0.1s ease; }
.game-choice:hover:not(:disabled) { border-color: var(--primary); background: var(--surface-hover); }
.game-choice:disabled { cursor: default; }
.game-choice.is-correct { border-color: var(--success); background: var(--success-bg); color: var(--success); }
.game-choice.is-wrong { border-color: var(--danger); background: var(--danger-bg); color: var(--danger); }
.game-result-hero { position: relative; text-align: center; padding: 36px 12px 8px; }
.game-result-score { font-size: 3.2rem; font-weight: 800; color: var(--primary); display: block; }
.leaderboard-table th, .leaderboard-table td { text-align: left; }
.leaderboard-table td:nth-child(1), .leaderboard-table th:nth-child(1) { text-align: center; width: 48px; }
.leaderboard-table td:last-child, .leaderboard-table th:last-child { text-align: right; }
.leaderboard-you { background: var(--tint-primary); }

/* ---------- Not found ---------- */
.not-found { position: relative; text-align: center; padding: 80px 0; }

/* ---------- Legal pages ---------- */
.legal-page { max-width: 760px; margin: 0 auto; }
.legal-head { position: relative; text-align: center; padding: 8px 12px 4px; }
.legal-head h1 { margin-bottom: 6px; }
.legal-updated { font-size: 0.85rem; }
.legal-switch { display: flex; justify-content: center; gap: 10px; flex-wrap: wrap; margin: 24px 0 36px; }
.legal-switch-link {
  font-weight: 700; font-size: 0.85rem; padding: 8px 16px; border-radius: 999px;
  background: var(--surface-card); border: 1px solid var(--border); color: var(--ink-secondary);
}
.legal-switch-link:hover { text-decoration: none; border-color: var(--border-strong); }
.legal-switch-link.is-active { background: var(--black); color: var(--gold-bright); border-color: var(--black); }
.legal-body {
  background: var(--surface-card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 32px; box-shadow: var(--shadow-sm);
}
.legal-body h2 { margin-top: 32px; }
.legal-body h2:first-child { margin-top: 0; }
.legal-body h3 { margin-top: 20px; }
.legal-body a { font-weight: 600; }
.legal-footnote { margin-top: 28px; padding-top: 20px; border-top: 1px dashed var(--border); font-size: 0.85rem; color: var(--ink-secondary); }

/* ---------- Footer ---------- */
.site-footer { background: var(--black); padding: 20px 0 18px; margin-top: 24px; border-top: 1px solid rgba(212, 175, 55, 0.25); }
.site-footer .footer-badge {
  display: flex; align-items: center; justify-content: center; gap: 12px;
  color: var(--gold-bright); font-size: 0.8rem; font-weight: 700;
  font-family: var(--font-display); text-transform: uppercase; letter-spacing: 0.1em;
}
.site-footer p { color: var(--on-dark-muted); opacity: 1; font-size: 0.72rem; text-align: center; margin: 6px 0 0; text-transform: none; font-weight: 400; letter-spacing: normal; }
.footer-legal-links { display: flex; justify-content: center; gap: 16px; margin: 12px 0 0; flex-wrap: wrap; }
.footer-legal-links a { color: var(--gold-bright); opacity: 0.85; font-size: 0.72rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.04em; }
.footer-legal-links a:hover { opacity: 1; text-decoration: underline; }
.footer-copyright { opacity: 0.55 !important; }

/* ---------- Responsive ---------- */
@media (max-width: 720px) {
  .header-inner { flex-wrap: wrap; height: auto; padding: 12px 0; }
  .main-nav { order: 3; width: 100%; overflow-x: auto; }
  h1 { font-size: 1.6rem; }
  .progress-summary-main { flex-direction: column; align-items: flex-start; }
  .domain-bar-row { grid-template-columns: 1fr; gap: 4px; }
  .quiz-result-header { flex-direction: column; text-align: center; }
  .hero-split { grid-template-columns: 1fr; text-align: center; padding-top: 32px; }
  .hero-copy { text-align: center; }
  .hero-sub { margin-left: auto; margin-right: auto; }
  .hero-actions { justify-content: center; }
  .hero-art { order: -1; }
  .hero-art svg { max-width: 220px; }
}