:root {
  --bg: #1a0f12;
  --bg-elev: #241519;
  --bg-card: #2d1a1f;
  --burgundy: #6b1f2a;
  --burgundy-light: #8b2a38;
  --cream: #f5ecd9;
  --cream-dim: #d8cdb6;
  --gold: #c9a25a;
  --gold-dim: #8a6f3e;
  --text: #f5ecd9;
  --text-dim: #b8ad95;
  --text-muted: #786f5d;
  --good: #7ab977;
  --good-bg: rgba(122,185,119,0.10);
  --good-border: rgba(122,185,119,0.45);
  --bad: #d97a5c;
  --bad-bg: rgba(217,122,92,0.10);
  --bad-border: rgba(217,122,92,0.50);
  --border: #3a242a;
  --radius: 10px;
  --shadow: 0 8px 30px rgba(0,0,0,0.35);
  --font-serif: 'Cormorant Garamond', Georgia, 'Times New Roman', serif;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

body {
  background:
    radial-gradient(ellipse at top left, rgba(107,31,42,0.25), transparent 50%),
    radial-gradient(ellipse at bottom right, rgba(201,162,90,0.10), transparent 50%),
    var(--bg);
  background-attachment: fixed;
}

.app {
  max-width: 820px;
  margin: 0 auto;
  padding: 32px 24px 80px;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ===== Header ===== */
.site-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 24px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 14px;
}

.brand-mark {
  font-size: 30px;
  color: var(--gold);
  line-height: 1;
}

.site-header h1 {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 28px;
  margin: 0;
  letter-spacing: 0.5px;
  color: var(--cream);
}

.subtitle {
  margin: 2px 0 0;
  color: var(--text-dim);
  font-size: 13px;
  letter-spacing: 0.3px;
}

.header-stats {
  font-size: 12px;
  color: var(--text-dim);
  text-align: right;
  font-variant-numeric: tabular-nums;
  line-height: 1.6;
}

/* ===== Main ===== */
main { flex: 1; }

/* ===== Filter bar ===== */
.filter-bar {
  margin-bottom: 22px;
  padding: 14px 16px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.filter-label-inline {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--gold);
  margin-bottom: 10px;
  font-weight: 600;
}

.chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 11px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text-dim);
  font-family: var(--font-sans);
  font-size: 12px;
  cursor: pointer;
  transition: all 0.15s ease;
  user-select: none;
}

.chip:hover {
  border-color: var(--gold-dim);
  color: var(--cream);
}

.chip.active {
  background: var(--burgundy);
  border-color: var(--burgundy-light);
  color: var(--cream);
}

.chip .count {
  font-size: 10px;
  opacity: 0.7;
  font-variant-numeric: tabular-nums;
}

.filter-meta {
  margin-top: 10px;
  font-size: 11px;
  color: var(--text-muted);
  letter-spacing: 0.3px;
}

/* ===== Card ===== */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  box-shadow: var(--shadow);
  transition: border-color 0.2s ease;
}

.card-good { border-color: var(--good-border); }
.card-bad  { border-color: var(--bad-border); }

.cat-tag {
  display: inline-flex;
  align-items: center;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--gold);
  margin-bottom: 14px;
  font-weight: 600;
}

.stat-pill {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 999px;
  background: var(--border);
  color: var(--text-dim);
  font-size: 10px;
  font-variant-numeric: tabular-nums;
  margin-left: 10px;
  letter-spacing: 0.5px;
}

/* When the cat-tag row only holds the stat pill (pre-reveal),
   drop the gold uppercase treatment so it's not visually a "hint". */
.cat-tag-solo {
  color: var(--text-muted);
  text-transform: none;
  letter-spacing: 0;
  font-weight: 400;
}
.cat-tag-solo .stat-pill { margin-left: 0; }

.question {
  font-family: var(--font-serif);
  font-weight: 500;
  font-size: 30px;
  line-height: 1.3;
  color: var(--cream);
  margin: 0 0 22px;
  letter-spacing: 0.3px;
}

.answer-input {
  width: 100%;
  padding: 14px 16px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--cream);
  font-family: var(--font-sans);
  font-size: 15px;
  resize: vertical;
  min-height: 80px;
  outline: none;
  transition: border-color 0.15s ease;
}

.answer-input:focus { border-color: var(--gold-dim); }
.answer-input:disabled { opacity: 0.7; cursor: default; }
.answer-input::placeholder { color: var(--text-muted); }

.hint {
  margin-top: 8px;
  font-size: 12px;
  color: var(--text-muted);
}

/* ===== MCQ options ===== */
.mcq-options {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 4px;
}

.option {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 13px 16px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--cream);
  font-family: var(--font-sans);
  font-size: 14px;
  cursor: pointer;
  text-align: left;
  transition: all 0.15s ease;
  line-height: 1.4;
}

.option:hover:not(:disabled) {
  border-color: var(--gold-dim);
  background: rgba(201, 162, 90, 0.06);
  color: var(--cream);
}

.option-letter {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  border: 1px solid var(--border);
  color: var(--gold);
  font-weight: 600;
  font-size: 12px;
  flex-shrink: 0;
  font-family: var(--font-sans);
  transition: all 0.15s ease;
}

.option-text { flex: 1; }

.option:hover:not(:disabled) .option-letter {
  border-color: var(--gold);
  background: rgba(201, 162, 90, 0.15);
}

.option-disabled {
  cursor: default;
}

.option-correct {
  border-color: var(--good-border);
  background: var(--good-bg);
  color: var(--good);
}
.option-correct .option-letter {
  border-color: var(--good);
  color: var(--good);
  background: rgba(122, 185, 119, 0.15);
}

.option-wrong {
  border-color: var(--bad-border);
  background: var(--bad-bg);
  color: var(--bad);
}
.option-wrong .option-letter {
  border-color: var(--bad);
  color: var(--bad);
  background: rgba(217, 122, 92, 0.15);
}

.option-dim {
  opacity: 0.35;
}

/* Flashcard mode: MCQ options are shown for reference, not clickable */
.option-static {
  cursor: default;
  pointer-events: none;
}
.option-static:hover { background: var(--bg); border-color: var(--border); color: var(--cream); }
.option-static:hover .option-letter { border-color: var(--border); background: transparent; }

/* Neutral reveal panel — used in flashcard mode instead of green/red */
.feedback-reveal {
  background: rgba(201, 162, 90, 0.08);
  border-color: rgba(201, 162, 90, 0.35);
}
.feedback-reveal .feedback-headline { color: var(--gold); }

/* ===== Feedback ===== */
.feedback {
  margin-top: 20px;
  padding: 18px 22px;
  border-radius: var(--radius);
  border: 1px solid;
}

.feedback-good {
  background: var(--good-bg);
  border-color: var(--good-border);
}

.feedback-bad {
  background: var(--bad-bg);
  border-color: var(--bad-border);
}

.feedback-headline {
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 10px;
  letter-spacing: 0.3px;
}

.feedback-good .feedback-headline { color: var(--good); }
.feedback-bad  .feedback-headline { color: var(--bad); }

.feedback-body { color: var(--cream); }

.reveal-answer {
  font-family: var(--font-serif);
  font-size: 19px;
  line-height: 1.5;
  color: var(--cream);
  margin: 0;
}

.reveal-detail {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--border);
  font-size: 13px;
  color: var(--text-dim);
  line-height: 1.55;
}

.reveal-detail strong {
  color: var(--gold);
  font-weight: 600;
}

/* ===== Buttons ===== */
.btn-row {
  display: flex;
  gap: 10px;
  margin-top: 22px;
  align-items: center;
  flex-wrap: wrap;
}

.btn {
  padding: 11px 20px;
  border: none;
  border-radius: var(--radius);
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s ease;
  letter-spacing: 0.3px;
}

.btn-primary {
  background: var(--burgundy);
  color: var(--cream);
}
.btn-primary:hover { background: var(--burgundy-light); }

.btn-secondary {
  background: transparent;
  color: var(--cream);
  border: 1px solid var(--border);
}
.btn-secondary:hover { border-color: var(--gold-dim); }

.btn-ghost {
  background: transparent;
  color: var(--text-dim);
  border: none;
  padding: 11px 12px;
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-color: var(--text-muted);
  font-weight: 500;
}
.btn-ghost:hover { color: var(--cream); }

.empty-state {
  padding: 60px 32px;
  text-align: center;
  color: var(--text-dim);
  background: var(--bg-card);
  border: 1px dashed var(--border);
  border-radius: var(--radius);
  font-style: italic;
}

/* ===== Footer ===== */
.site-footer {
  margin-top: 48px;
  padding-top: 18px;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 12px;
  color: var(--text-muted);
}

.link-btn {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 12px;
  padding: 4px 8px;
  font-family: inherit;
  text-decoration: underline;
  text-underline-offset: 3px;
}
.link-btn:hover { color: var(--cream); }

/* ===== Responsive ===== */
@media (max-width: 600px) {
  .app { padding: 20px 16px 60px; }
  .site-header { flex-direction: column; }
  .header-stats { text-align: left; }
  .site-header h1 { font-size: 22px; }
  .question { font-size: 22px; }
  .card { padding: 22px; }
  .feedback { padding: 16px; }
  .feedback-headline { font-size: 17px; }
  .reveal-answer { font-size: 16px; }
}