/* === Reset & Base === */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --font-display: Georgia, "Noto Serif", "Times New Roman", serif;
  --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;

  --text-xs: 0.9375rem;
  --text-sm: 1rem;
  --text-base: 1.125rem;

  --bg: oklch(99.5% 0.003 240);
  --bg-hover: oklch(97% 0.008 240);
  --text: oklch(15% 0.005 240);
  --text-secondary: oklch(35% 0.005 240);
  --text-muted: oklch(50% 0.005 240);
  --border: oklch(90% 0.005 240);
  --border-strong: oklch(75% 0.008 240);
  --border-heavy: oklch(25% 0.01 240);
  --bg-input: oklch(94.5% 0.035 240);
  --accent: oklch(42% 0.14 240);
  --accent-hover: oklch(32% 0.16 240);
  --accent-light: oklch(97% 0.015 240);
  --highlight: oklch(93% 0.10 90);
  --highlight-text: oklch(35% 0.10 90);
}

html { font-size: 16px; }

body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--text);
  line-height: 1.55;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
}

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

/* === Skip Link === */
.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  padding: 0.5rem 1rem;
  background: var(--text);
  color: var(--bg);
  font-size: var(--text-xs);
  font-weight: 700;
  z-index: 200;
}

.skip-link:focus { left: 0; }

/* === Hero === */
.hero {
  max-width: 1400px;
  margin: 0 auto;
  padding: 3.5rem 2rem 1.5rem;
}

.hero-main {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
}

.hero-submit {
  flex-shrink: 0;
  padding: 0.4rem 1rem;
  border: 1px solid var(--border-strong);
  border-radius: 4px;
  font-size: var(--text-sm);
  color: var(--text);
  text-decoration: none;
  white-space: nowrap;
}

.hero-submit:hover {
  border-color: var(--accent);
  color: var(--accent);
  text-decoration: none;
}

.hero h1 {
  font-family: var(--font-display);
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 400;
  letter-spacing: -0.01em;
  line-height: 1.1;
  color: var(--accent);
  margin-bottom: 0.75rem;
}

.hero-sub {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 0.5rem;
}

.hero-sub a { color: var(--text-secondary); font-weight: 600; }
.hero-sub a:hover { color: var(--accent); }

.hero-gh {
  font-size: var(--text-sm);
  color: var(--text-muted);
  font-weight: 500;
}

.hero-gh:hover { color: var(--accent); }

/* === Controls === */
.controls {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 2rem 1rem;
}

.search-wrap {
  position: relative;
  margin-bottom: 0.75rem;
}

.search-icon {
  position: absolute;
  left: 1rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  pointer-events: none;
}

.search {
  width: 100%;
  padding: 0.65rem 1rem 0.65rem 2.75rem;
  border: 1px solid transparent;
  border-radius: 4px;
  background: var(--bg-input);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  color: var(--text);
}

.search::placeholder { color: var(--text-muted); }

.search:focus {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-color: var(--accent);
  background: var(--bg);
}

.filter-bar[hidden] { display: none; }

.filter-bar {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.5rem 0;
  font-size: var(--text-sm);
  color: var(--text-secondary);
}

.filter-bar strong {
  color: var(--text);
}

.filter-clear {
  background: none;
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0.15rem 0.5rem;
  font-family: inherit;
  font-size: var(--text-xs);
  color: var(--text-muted);
  cursor: pointer;
}

.filter-clear:hover {
  border-color: var(--text-muted);
  color: var(--text);
}

.stats {
  font-size: var(--text-sm);
  color: var(--text-muted);
  font-variant-numeric: tabular-nums;
}

.stats strong { color: var(--text-secondary); }

/* === Table === */
.table-wrap {
  width: 100%;
  padding: 0;
  overflow-x: auto;
}

.table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  font-size: var(--text-sm);
}

.table thead th {
  text-align: left;
  font-weight: 700;
  font-size: var(--text-base);
  color: var(--text);
  padding: 0.65rem 0.75rem;
  border-bottom: 2px solid var(--border-heavy);
  position: sticky;
  top: 0;
  background: var(--bg);
  z-index: 10;
  white-space: nowrap;
}

.table thead th:first-child,
.table tbody td:first-child {
  padding-left: max(2rem, calc(50vw - 700px + 2rem));
}

.table thead th:last-child,
.table tbody td:last-child {
  padding-right: max(2rem, calc(50vw - 700px + 2rem));
}

.table tbody td {
  padding: 0.7rem 0.75rem;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}

.table tbody tr.row:not(.open):hover td {
  background: var(--bg-hover);
}

.table tbody tr[hidden] { display: none; }

.col-num {
  width: 3rem;
  color: var(--text-muted);
  font-variant-numeric: tabular-nums;
  text-align: right;
}

.col-name {
  width: 35%;
  overflow-wrap: break-word;
  word-wrap: break-word;
  word-break: break-word;
}

.col-name > a {
  font-weight: 500;
  color: var(--accent);
  text-decoration: none;
}

.col-name > a:hover { text-decoration: underline; color: var(--accent-hover); }

/* === Stars Column === */
.col-stars {
  width: 5rem;
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
  color: var(--text-secondary);
}

/* === Arrow Column === */
.col-arrow {
  width: 2.5rem;
  text-align: center;
}

.arrow {
  display: inline-block;
  font-size: 0.8rem;
  color: var(--accent);
  transition: transform 0.15s ease;
}

.row.open .arrow {
  transform: rotate(90deg);
}

/* === Row Click === */
.row { cursor: pointer; }

/* === Expand Row === */
.expand-row {
  display: none;
}

.row.open + .expand-row {
  display: table-row;
}

.row.open td {
  background: var(--accent-light);
  border-bottom-color: transparent;
  padding-bottom: 0.1rem;
}

.expand-row td {
  padding: 0.15rem 0.75rem 0.75rem;
  background: var(--accent-light);
  border-bottom: 1px solid var(--border);
}

.expand-content {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  line-height: 1.6;
}

.expand-also-see {
  margin-top: 0.25rem;
  font-size: var(--text-xs);
  color: var(--text-muted);
}

.expand-also-see a {
  color: var(--accent);
  text-decoration: none;
}

.expand-also-see a:hover {
  text-decoration: underline;
}

.expand-meta {
  margin-top: 0.25rem;
  font-size: var(--text-xs);
  color: var(--text-muted);
  font-weight: normal;
}

.expand-meta a {
  color: var(--accent);
  text-decoration: none;
}

.expand-meta a:hover {
  text-decoration: underline;
}

.expand-sep {
  margin: 0 0.25rem;
  color: var(--border);
}

.col-cat, .col-group {
  width: 13%;
  white-space: nowrap;
}

/* === Tags === */
.tag {
  background: var(--accent-light);
  border: none;
  font-family: inherit;
  font-size: var(--text-xs);
  color: oklch(45% 0.06 240);
  cursor: pointer;
  padding: 0.15rem 0.35rem;
  border-radius: 3px;
  white-space: nowrap;
}

.tag:hover {
  background: var(--accent-light);
  color: var(--accent);
}

.tag.active {
  background: var(--highlight);
  color: var(--highlight-text);
  font-weight: 600;
}

/* === No Results === */
.no-results {
  max-width: 1400px;
  margin: 0 auto;
  padding: 3rem 2rem;
  font-size: var(--text-base);
  color: var(--text-muted);
  text-align: center;
}

/* === Footer === */
.footer {
  margin-top: auto;
  border-top: none;
  width: 100%;
  padding: 1.25rem 2rem;
  font-size: var(--text-xs);
  color: var(--text-muted);
  background: var(--bg-input);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.footer a { color: var(--text-muted); text-decoration: none; }
.footer a:hover { color: var(--accent); }

.footer-links {
  display: flex;
  gap: 1rem;
}

/* === Responsive === */
@media (max-width: 900px) {
  .col-group { display: none; }
}

@media (max-width: 640px) {
  .hero { padding: 2rem 1.25rem 1rem; }
  .controls { padding: 0 1.25rem 0.75rem; }

  .table thead th:first-child,
  .table tbody td:first-child { padding-left: 1.25rem; }

  .table thead th:last-child,
  .table tbody td:last-child { padding-right: 1.25rem; }

  .col-cat { display: none; }
  .col-name { white-space: normal; }
  .footer { padding: 1.25rem; flex-direction: column; gap: 0.5rem; }
}

/* === Screen Reader Only === */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* === Reduced Motion === */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    transition-duration: 0.01ms !important;
  }
}