:root {
  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --bg: #ffffff;
  --bg-alt: #f7f8fa;
  --text: #1a1a2e;
  --text-muted: #6b7280;
  --border: #e5e7eb;
  --accent: #4f46e5;
  --accent-light: #eef2ff;
  --success: #059669;
  --success-bg: #ecfdf5;
  --danger: #dc2626;
  --danger-bg: #fef2f2;
  --card-shadow: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.06);
  --radius: 8px;
  --max-w: 1060px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f172a;
    --bg-alt: #1e293b;
    --text: #e2e8f0;
    --text-muted: #94a3b8;
    --border: #334155;
    --accent: #818cf8;
    --accent-light: #1e1b4b;
    --success: #34d399;
    --success-bg: #064e3b;
    --danger: #f87171;
    --danger-bg: #450a0a;
    --card-shadow: 0 1px 3px rgba(0,0,0,0.3);
  }
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; font-size: 15px; }

body {
  font-family: var(--font);
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.container { max-width: var(--max-w); margin: 0 auto; padding: 0 20px; }

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* Hero */
.hero {
  background: linear-gradient(135deg, #1e1b4b 0%, #312e81 40%, #4f46e5 100%);
  color: #fff;
  padding: 44px 0 38px;
  text-align: center;
}
.hero-eyebrow {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  background: rgba(255,255,255,0.12);
  padding: 4px 16px;
  border-radius: 20px;
  margin-bottom: 20px;
}
.hero h1 {
  font-size: 1.8rem;
  font-weight: 700;
  margin-bottom: 0;
  letter-spacing: -0.02em;
  line-height: 1.25;
  max-width: 680px;
  margin-left: auto;
  margin-right: auto;
}

/* Results section */
.results-section {
  padding: 40px 0;
  text-align: center;
  border-bottom: 1px solid var(--border);
}
.results-model-name {
  font-size: 1.4rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text);
  margin-bottom: 4px;
}
.results-model-sub {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 28px;
}
.results-scores {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 64px;
}
.results-metric {
  text-align: center;
  position: relative;
}
.results-ring {
  position: relative;
  width: 150px;
  height: 150px;
  margin: 0 auto 12px;
}
.results-ring svg {
  width: 100%;
  height: 100%;
  transform: rotate(-90deg);
}
.results-ring-bg {
  fill: none;
  stroke: var(--border);
  stroke-width: 10;
}
.results-ring-fill {
  fill: none;
  stroke: var(--accent);
  stroke-width: 10;
  stroke-linecap: round;
  transition: stroke-dashoffset 1s ease-out;
}
.results-ring-value {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: 2.2rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--text);
}
.results-label {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-muted);
}

/* About section */
.about-cards {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}
.about-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 16px;
  box-shadow: var(--card-shadow);
}
.about-card-icon {
  font-size: 1.3rem;
  margin-bottom: 10px;
}
.about-card h3 {
  font-size: 0.82rem;
  font-weight: 700;
  margin-bottom: 6px;
  letter-spacing: -0.01em;
}
.about-card p {
  font-size: 0.8rem;
  color: var(--text-muted);
  line-height: 1.55;
}

/* Sections */
.section { padding: 40px 0; }
.section-alt { background: var(--bg-alt); }
.section h2 { font-size: 1.3rem; font-weight: 700; margin-bottom: 6px; letter-spacing: -0.01em; }
.section-desc { color: var(--text-muted); margin-bottom: 24px; max-width: 680px; font-size: 0.88rem; }

/* Charts */
.charts-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.chart-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--card-shadow);
}
.chart-card h3 { font-size: 0.88rem; font-weight: 600; margin-bottom: 14px; color: var(--text-muted); }
.chart-container { position: relative; height: 200px; }

/* Table controls */
.table-controls { display: flex; gap: 10px; margin-bottom: 14px; flex-wrap: wrap; align-items: center; }
.search-input {
  padding: 7px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 0.82rem;
  background: var(--bg);
  color: var(--text);
  min-width: 180px;
}
.search-input:focus { outline: 2px solid var(--accent); outline-offset: -1px; border-color: var(--accent); }
.sort-label {
  font-size: 0.78rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 5px;
}
.sort-select {
  padding: 7px 8px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 0.82rem;
  background: var(--bg);
  color: var(--text);
}

/* Data Table */
.table-wrapper { overflow-x: auto; }
.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.82rem;
}
.data-table th, .data-table td {
  padding: 8px 12px;
  text-align: left;
  border-bottom: 1px solid var(--border);
}
.data-table th {
  font-weight: 600;
  color: var(--text-muted);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  cursor: pointer;
  user-select: none;
  white-space: nowrap;
}
.data-table th:hover { color: var(--accent); }
.data-table th.sorted-asc::after { content: ' ▲'; font-size: 0.6rem; }
.data-table th.sorted-desc::after { content: ' ▼'; font-size: 0.6rem; }
.data-table tbody tr:hover { background: var(--accent-light); }

.accuracy-cell {
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  padding: 4px 10px;
  border-radius: 4px;
  display: inline-block;
  min-width: 60px;
  text-align: center;
}

.cat-name {
  font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
  font-size: 0.8rem;
  background: var(--bg-alt);
  padding: 2px 8px;
  border-radius: 4px;
}

/* Audio Explorer */
.sentence-card {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 8px;
  background: var(--bg);
  overflow: hidden;
}
.sentence-header {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 12px 16px;
  cursor: pointer;
  transition: background 0.15s;
}
.sentence-header:hover { background: var(--accent-light); }
.sentence-index {
  color: var(--text-muted);
  font-size: 0.7rem;
  font-weight: 600;
  min-width: 32px;
  padding-top: 2px;
}
.sentence-text { flex: 1; font-size: 0.85rem; }
.sentence-tags { display: flex; gap: 4px; flex-wrap: wrap; margin-top: 4px; }
.tag {
  font-size: 0.7rem;
  padding: 1px 8px;
  border-radius: 10px;
  background: var(--accent-light);
  color: var(--accent);
  font-weight: 500;
}
.sentence-status { display: flex; gap: 4px; padding-top: 2px; flex-shrink: 0; }
.status-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  display: inline-block;
}
.status-dot.pass { background: var(--success); }
.status-dot.fail { background: var(--danger); }
.expand-icon {
  color: var(--text-muted);
  font-size: 0.85rem;
  padding-top: 2px;
  transition: transform 0.2s;
}
.sentence-card.open .expand-icon { transform: rotate(90deg); }

.sentence-detail { display: none; padding: 0 18px 18px; border-top: 1px solid var(--border); }
.sentence-card.open .sentence-detail { display: block; }

.model-result {
  padding: 14px 0;
  border-bottom: 1px solid var(--border);
}
.model-result:last-child { border-bottom: none; }
.model-result-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 8px;
}
.model-name { font-weight: 600; font-size: 0.875rem; }
.model-badge {
  font-size: 0.7rem;
  padding: 2px 8px;
  border-radius: 10px;
  font-weight: 600;
}
.model-badge.pass { background: var(--success-bg); color: var(--success); }
.model-badge.fail { background: var(--danger-bg); color: var(--danger); }

.model-audio { margin: 8px 0; }
.model-audio audio { width: 100%; max-width: 400px; height: 36px; }

.model-transcription {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin: 6px 0;
}
.model-transcription strong { color: var(--text); font-weight: 500; }

.unit-results { display: flex; gap: 6px; flex-wrap: wrap; margin-top: 6px; }
.unit-badge {
  font-size: 0.7rem;
  padding: 2px 8px;
  border-radius: 4px;
  font-weight: 500;
}
.unit-badge.match { background: var(--success-bg); color: var(--success); }
.unit-badge.miss { background: var(--danger-bg); color: var(--danger); }

.gemini-notes {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-style: italic;
  margin-top: 6px;
}

/* Pagination */
.pagination {
  display: flex;
  justify-content: center;
  gap: 4px;
  margin-top: 20px;
  flex-wrap: wrap;
}
.page-btn {
  padding: 6px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg);
  color: var(--text);
  cursor: pointer;
  font-size: 0.8rem;
  font-weight: 500;
}
.page-btn:hover { border-color: var(--accent); color: var(--accent); }
.page-btn.active { background: var(--accent); color: #fff; border-color: var(--accent); }
.page-btn:disabled { opacity: 0.4; cursor: default; }

/* Methodology */
.methodology-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.method-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--card-shadow);
}
.method-card h3 { font-size: 0.88rem; font-weight: 600; margin-bottom: 6px; }
.method-card p { font-size: 0.82rem; color: var(--text-muted); line-height: 1.6; }

/* Human Validation */
.validation-callout {
  display: flex;
  align-items: center;
  gap: 28px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 32px;
  box-shadow: var(--card-shadow);
  margin-bottom: 32px;
}
.validation-stat {
  font-size: 3rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--success);
  line-height: 1;
  flex-shrink: 0;
}
.validation-label {
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 4px;
  color: var(--text);
}
.validation-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.55;
  margin: 0;
}
.disagreement-heading {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 6px;
  letter-spacing: -0.01em;
}
.disagreement-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
.disagreement-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
  box-shadow: var(--card-shadow);
}
.disagreement-card .tag { margin-bottom: 10px; display: inline-block; }
.disagreement-text {
  font-size: 0.85rem;
  color: var(--text);
  line-height: 1.5;
  margin-bottom: 10px;
  font-style: italic;
}
.disagreement-detail {
  display: flex;
  gap: 8px;
  margin-bottom: 10px;
}
.disagreement-reason {
  font-size: 0.78rem;
  color: var(--text-muted);
  line-height: 1.55;
}

/* Downloads */
.download-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.download-card {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 18px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg);
  box-shadow: var(--card-shadow);
  transition: border-color 0.15s, box-shadow 0.15s;
  color: var(--text);
  text-decoration: none;
}
.download-card:hover {
  border-color: var(--accent);
  box-shadow: 0 4px 12px rgba(79,70,229,0.12);
  text-decoration: none;
}
.download-icon { font-size: 1.3rem; flex-shrink: 0; }
.download-card strong { display: block; margin-bottom: 3px; font-size: 0.88rem; }
.download-card p { font-size: 0.78rem; color: var(--text-muted); margin: 0; }

/* Footer */
.footer {
  padding: 24px 0;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.75rem;
  border-top: 1px solid var(--border);
}

/* Responsive — HF iframe / narrow desktop */
@media (max-width: 1024px) {
  .about-cards { grid-template-columns: repeat(2, 1fr); }
  .methodology-grid { grid-template-columns: 1fr; }
  .disagreement-grid { grid-template-columns: 1fr; }
  .results-scores { gap: 48px; }
  .results-ring { width: 130px; height: 130px; }
  .results-ring-value { font-size: 1.9rem; }
}

/* Responsive — tablet / mobile */
@media (max-width: 768px) {
  html { font-size: 14px; }

  .hero { padding: 32px 0 28px; }
  .hero h1 { font-size: 1.4rem; }
  .hero h1 br { display: none; }

  .results-section { padding: 28px 0; }
  .results-scores { flex-direction: column; gap: 24px; }
  .results-ring { width: 120px; height: 120px; }
  .results-ring-value { font-size: 1.7rem; }
  .results-model-name { font-size: 1.2rem; }

  .about-cards { grid-template-columns: 1fr; }

  .validation-callout { flex-direction: column; text-align: center; gap: 16px; }
  .validation-stat { font-size: 2.4rem; }

  .charts-grid,
  .download-grid { grid-template-columns: 1fr; }

  .section { padding: 28px 0; }
  .table-controls { flex-direction: column; }
  .search-input { width: 100%; }
}

/* Loading state */
.loading {
  text-align: center;
  padding: 40px;
  color: var(--text-muted);
}
.loading::after {
  content: '';
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 2px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
  margin-left: 8px;
  vertical-align: middle;
}
@keyframes spin { to { transform: rotate(360deg); } }