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

:root {
  --font: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --shell-max: 72rem;
  --radius: 8px;
  --radius-pill: 999px;
  --transition: 0.2s ease;

  /* Light mode (default) */
  --bg-page: #ffffff;
  --bg-surface: #f8fafc;
  --bg-surface-hover: #f1f5f9;
  --bg-hero: #0f172a;
  --bg-hero-accent: #1e293b;
  --ink: #0f172a;
  --ink-secondary: #475569;
  --ink-tertiary: #94a3b8;
  --ink-hero: #f1f5f9;
  --ink-hero-secondary: #94a3b8;
  --border: #e2e8f0;
  --border-light: #f1f5f9;
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --accent-subtle: #eff6ff;
  --tag-group-bg: #f0f9ff;
  --tag-group-ink: #0369a1;
  --tag-group-border: #bae6fd;
  --tag-cat-bg: #f5f3ff;
  --tag-cat-ink: #6d28d9;
  --tag-cat-border: #ddd6fe;
  --badge-bg: #fef3c7;
  --badge-ink: #92400e;
  --expand-bg: #f8fafc;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
}

[data-theme="dark"] {
  --bg-page: #0f172a;
  --bg-surface: #1e293b;
  --bg-surface-hover: #334155;
  --bg-hero: #020617;
  --bg-hero-accent: #0f172a;
  --ink: #f1f5f9;
  --ink-secondary: #94a3b8;
  --ink-tertiary: #64748b;
  --border: #334155;
  --border-light: #1e293b;
  --accent: #60a5fa;
  --accent-hover: #93c5fd;
  --accent-subtle: rgba(96, 165, 250, 0.1);
  --tag-group-bg: rgba(14, 165, 233, 0.12);
  --tag-group-ink: #7dd3fc;
  --tag-group-border: rgba(14, 165, 233, 0.25);
  --tag-cat-bg: rgba(139, 92, 246, 0.12);
  --tag-cat-ink: #c4b5fd;
  --tag-cat-border: rgba(139, 92, 246, 0.25);
  --badge-bg: rgba(251, 191, 36, 0.15);
  --badge-ink: #fcd34d;
  --expand-bg: #1e293b;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -2px rgba(0, 0, 0, 0.3);
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font);
  font-size: 15px;
  line-height: 1.6;
  color: var(--ink);
  background: var(--bg-page);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a:hover {
  color: var(--accent-hover);
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

.shell {
  max-width: var(--shell-max);
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ===== Hero ===== */
.hero {
  background: var(--bg-hero);
  color: var(--ink-hero);
  min-height: 80vh;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 50% 40%, rgba(37, 99, 235, 0.12) 0%, transparent 70%),
    radial-gradient(ellipse 50% 80% at 80% 60%, rgba(99, 102, 241, 0.08) 0%, transparent 60%);
  pointer-events: none;
}

.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg width='40' height='40' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M0 0h40v40H0z' fill='none'/%3E%3Cpath d='M0 40L40 0' stroke='%23ffffff' stroke-opacity='0.03' stroke-width='1'/%3E%3C/svg%3E");
  pointer-events: none;
}

.hero-inner {
  width: 100%;
  max-width: var(--shell-max);
  margin: 0 auto;
  padding: 2rem 1.5rem;
  position: relative;
  z-index: 1;
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 4rem;
}

.nav-brand {
  font-weight: 700;
  font-size: 1rem;
  letter-spacing: -0.01em;
  opacity: 0.7;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.nav-links a {
  color: var(--ink-hero-secondary);
  font-size: 0.875rem;
  font-weight: 500;
  transition: color var(--transition);
}

.nav-links a:hover {
  color: var(--ink-hero);
}

.nav-submit {
  background: var(--accent);
  color: #fff !important;
  padding: 0.375rem 0.875rem;
  border-radius: var(--radius-pill);
  font-size: 0.8125rem;
  font-weight: 600;
  transition: background var(--transition), opacity var(--transition);
}

.nav-submit:hover {
  background: var(--accent-hover);
  color: #fff !important;
}

.theme-toggle {
  color: var(--ink-hero-secondary);
  padding: 0.375rem;
  border-radius: var(--radius);
  transition: color var(--transition), background var(--transition);
  display: flex;
  align-items: center;
}

.theme-toggle:hover {
  color: var(--ink-hero);
  background: rgba(255, 255, 255, 0.08);
}

.icon-moon { display: none; }
[data-theme="dark"] .icon-sun { display: none; }
[data-theme="dark"] .icon-moon { display: block; }

.hero-content {
  max-width: 40rem;
}

.hero-content h1 {
  font-size: clamp(2.75rem, 6vw, 4.5rem);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -0.03em;
  margin-bottom: 1rem;
}

.hero-subtitle {
  font-size: clamp(1.05rem, 2vw, 1.25rem);
  color: var(--ink-hero-secondary);
  line-height: 1.5;
  margin-bottom: 0.5rem;
}

.hero-maintained {
  font-size: 0.9rem;
  color: var(--ink-hero-secondary);
  opacity: 0.7;
  margin-bottom: 2rem;
}

.hero-maintained a {
  color: var(--ink-hero);
  font-weight: 500;
  opacity: 1;
}

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

.hero-stats {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 2.5rem;
  font-size: 0.9rem;
  color: var(--ink-hero-secondary);
}

.hero-stats strong {
  color: var(--ink-hero);
  font-weight: 600;
}

.stat-sep {
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--ink-hero-secondary);
  opacity: 0.4;
}

.hero-cta {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.75rem;
  background: var(--accent);
  color: #fff;
  font-weight: 600;
  font-size: 0.9rem;
  border-radius: var(--radius-pill);
  transition: background var(--transition), transform var(--transition);
}

.hero-cta:hover {
  background: var(--accent-hover);
  color: #fff;
  transform: translateY(-1px);
}

/* ===== Controls ===== */
.list-section {
  padding: 3rem 0 2rem;
}

.controls {
  display: flex;
  gap: 0.75rem;
  margin-bottom: 1rem;
  flex-wrap: wrap;
}

.search-wrap {
  flex: 1;
  min-width: 240px;
  position: relative;
}

.search-icon {
  position: absolute;
  left: 0.875rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--ink-tertiary);
  pointer-events: none;
}

.search-input {
  width: 100%;
  padding: 0.625rem 2.5rem 0.625rem 2.5rem;
  font-family: var(--font);
  font-size: 0.9rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
  background: var(--bg-surface);
  color: var(--ink);
  outline: none;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.search-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-subtle);
}

.search-input::placeholder {
  color: var(--ink-tertiary);
}

.search-kbd {
  position: absolute;
  right: 0.75rem;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font);
  font-size: 0.7rem;
  font-weight: 500;
  color: var(--ink-tertiary);
  background: var(--bg-page);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0.1rem 0.4rem;
  line-height: 1.4;
  pointer-events: none;
}

/* ===== Tag Cloud ===== */
.tag-cloud {
  padding: 1rem 0 0.5rem 0;
  margin-bottom: 1rem;
}

.tag-cloud-label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--ink-tertiary);
  margin-bottom: 0.5rem;
}

.tag-cloud-items {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
}

.tag-cloud-item {
  transition: transform var(--transition), opacity var(--transition);
}

.tag-cloud-item:hover {
  transform: scale(1.08);
}

.filter-controls select {
  padding: 0.625rem 2rem 0.625rem 0.875rem;
  font-family: var(--font);
  font-size: 0.875rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
  background: var(--bg-surface);
  color: var(--ink);
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg width='10' height='6' viewBox='0 0 10 6' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M1 1l4 4 4-4' stroke='%2394a3b8' fill='none' stroke-width='1.5' stroke-linecap='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.75rem center;
  cursor: pointer;
  outline: none;
  transition: border-color var(--transition);
}

.filter-controls select:focus {
  border-color: var(--accent);
}

/* ===== Filter Bar ===== */
.filter-bar {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  background: var(--accent-subtle);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 1rem;
  font-size: 0.85rem;
}

.filter-label {
  color: var(--ink-secondary);
}

.filter-value {
  font-weight: 600;
  color: var(--accent);
}

.filter-clear {
  margin-left: auto;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--ink-secondary);
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-pill);
  transition: background var(--transition), color var(--transition);
}

.filter-clear:hover {
  background: var(--bg-surface-hover);
  color: var(--ink);
}

/* ===== Table ===== */
.table-wrap {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

.table {
  width: 100%;
  border-collapse: collapse;
  table-layout: fixed;
}

.table thead {
  position: sticky;
  top: 0;
  z-index: 10;
}

.table th {
  background: var(--bg-surface);
  color: var(--ink-secondary);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.75rem 1rem;
  text-align: left;
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
  user-select: none;
}

.table th[data-sort] {
  cursor: pointer;
  transition: color var(--transition);
}

.table th[data-sort]:hover {
  color: var(--accent);
}

.sort-arrow::after {
  content: "";
  margin-left: 0.25rem;
}

.table th[data-sort].asc .sort-arrow::after {
  content: " \2191";
}

.table th[data-sort].desc .sort-arrow::after {
  content: " \2193";
}

.table td {
  padding: 0.625rem 1rem;
  border-bottom: 1px solid var(--border-light);
  vertical-align: middle;
  font-size: 0.875rem;
}

/* Column widths */
.col-num {
  width: 3rem;
  text-align: center;
  color: var(--ink-tertiary);
  font-size: 0.8rem;
  font-variant-numeric: tabular-nums;
}

.col-name {
  width: auto;
}

.col-name a {
  font-weight: 600;
  color: var(--ink);
  transition: color var(--transition);
}

.col-name a:hover {
  color: var(--accent);
}

.mobile-category {
  display: none;
}

.col-stars {
  width: 6rem;
  text-align: right;
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

.stars {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--ink-secondary);
}

.stars svg {
  color: #eab308;
}

[data-theme="dark"] .stars svg {
  color: #facc15;
}

.col-update {
  width: 7.5rem;
  white-space: nowrap;
}

.last-update {
  font-size: 0.8rem;
  color: var(--ink-tertiary);
  font-variant-numeric: tabular-nums;
}

.col-tags {
  width: auto;
}

.col-arrow {
  width: 2.5rem;
  text-align: center;
}

.arrow {
  color: var(--ink-tertiary);
  font-size: 1.1rem;
  transition: transform var(--transition);
  display: inline-block;
}

/* Row interaction */
.row {
  cursor: pointer;
  transition: background var(--transition);
}

.row:hover {
  background: var(--bg-surface-hover);
}

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

/* Expand row */
.expand-row td {
  padding: 0;
  border-bottom: 1px solid var(--border);
}

.expand-content {
  padding: 1rem 1rem 1rem 4rem;
  background: var(--expand-bg);
  animation: expand-in 0.15s ease;
}

@keyframes expand-in {
  from {
    opacity: 0;
    transform: translateY(-4px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.expand-desc {
  color: var(--ink-secondary);
  font-size: 0.875rem;
  line-height: 1.6;
  margin-bottom: 0.5rem;
}

.expand-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: 0.8rem;
}

.expand-links a {
  color: var(--ink-tertiary);
  transition: color var(--transition);
}

.expand-links a:hover {
  color: var(--accent);
}

/* Tags */
.tag {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 500;
  padding: 0.15rem 0.6rem;
  border-radius: var(--radius-pill);
  margin: 0.125rem 0.125rem;
  transition: opacity var(--transition), transform var(--transition);
  line-height: 1.6;
}

.tag:hover {
  opacity: 0.8;
  transform: scale(1.03);
}

.tag-lang {
  background: var(--tag-group-bg);
  color: var(--tag-group-ink);
  border: 1px solid var(--tag-group-border);
}

.tag-section {
  background: var(--tag-cat-bg);
  color: var(--tag-cat-ink);
  border: 1px solid var(--tag-cat-border);
}

.tag-source {
  font-size: 0.65rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.tag-github {
  background: rgba(36, 41, 47, 0.08);
  color: #24292f;
  border: 1px solid rgba(36, 41, 47, 0.2);
}

[data-theme="dark"] .tag-github {
  background: rgba(255, 255, 255, 0.08);
  color: #e6edf3;
  border: 1px solid rgba(255, 255, 255, 0.15);
}

.tag-cran {
  background: rgba(39, 109, 195, 0.08);
  color: #276dc3;
  border: 1px solid rgba(39, 109, 195, 0.25);
}

[data-theme="dark"] .tag-cran {
  background: rgba(75, 143, 219, 0.12);
  color: #6aaef0;
  border: 1px solid rgba(75, 143, 219, 0.25);
}

.tag-pypi {
  background: rgba(0, 110, 165, 0.08);
  color: #006ea5;
  border: 1px solid rgba(0, 110, 165, 0.25);
}

[data-theme="dark"] .tag-pypi {
  background: rgba(0, 150, 214, 0.12);
  color: #41b6e6;
  border: 1px solid rgba(0, 150, 214, 0.25);
}

.tag-commercial {
  background: var(--badge-bg);
  color: var(--badge-ink);
  border: 1px solid rgba(146, 64, 14, 0.2);
}

[data-theme="dark"] .tag-commercial {
  border-color: rgba(252, 211, 77, 0.25);
}

/* Language-specific tag colors */
.tag-lang[data-filter-value="Python"] { background: #306998; color: #FFD43B; border: 1px solid rgba(48, 105, 152, 0.3); }
.tag-lang[data-filter-value="R"] { background: #276DC3; color: #fff; border: 1px solid rgba(39, 109, 195, 0.3); }
.tag-lang[data-filter-value="Julia"] { background: #9558B2; color: #fff; border: 1px solid rgba(149, 88, 178, 0.3); }
.tag-lang[data-filter-value="JavaScript"] { background: #F7DF1E; color: #000; border: 1px solid rgba(247, 223, 30, 0.3); }
.tag-lang[data-filter-value="Rust"] { background: #CE412B; color: #fff; border: 1px solid rgba(206, 65, 43, 0.3); }
.tag-lang[data-filter-value="C++"] { background: #00599C; color: #fff; border: 1px solid rgba(0, 89, 156, 0.3); }
.tag-lang[data-filter-value="C#"] { background: #68217A; color: #fff; border: 1px solid rgba(104, 33, 122, 0.3); }
.tag-lang[data-filter-value="Java"] { background: #ED8B00; color: #fff; border: 1px solid rgba(237, 139, 0, 0.3); }
.tag-lang[data-filter-value="Golang"] { background: #00ADD8; color: #fff; border: 1px solid rgba(0, 173, 216, 0.3); }
.tag-lang[data-filter-value="Haskell"] { background: #5D4F85; color: #fff; border: 1px solid rgba(93, 79, 133, 0.3); }
.tag-lang[data-filter-value="Scala"] { background: #DC322F; color: #fff; border: 1px solid rgba(220, 50, 47, 0.3); }
.tag-lang[data-filter-value="Ruby"] { background: #CC342D; color: #fff; border: 1px solid rgba(204, 52, 45, 0.3); }
.tag-lang[data-filter-value="Matlab"] { background: #E16737; color: #fff; border: 1px solid rgba(225, 103, 55, 0.3); }
.tag-lang[data-filter-value="Elixir/Erlang"] { background: #4B275F; color: #fff; border: 1px solid rgba(75, 39, 95, 0.3); }
.tag-lang[data-filter-value="PHP"] { background: #777BB4; color: #fff; border: 1px solid rgba(119, 123, 180, 0.3); }

/* ===== Results ===== */
.no-results {
  text-align: center;
  padding: 3rem 1rem;
  color: var(--ink-tertiary);
  font-size: 0.95rem;
}

.results-count {
  padding: 0.75rem 0;
  font-size: 0.8rem;
  color: var(--ink-tertiary);
  text-align: right;
}

/* ===== CTA Section ===== */
.cta-section {
  text-align: center;
  padding: 4rem 0;
  border-top: 1px solid var(--border);
}

.cta-section h2 {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 0.5rem;
}

.cta-section p {
  color: var(--ink-secondary);
  margin-bottom: 1.5rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  padding: 0.625rem 1.5rem;
  background: var(--accent);
  color: #fff;
  font-weight: 600;
  font-size: 0.875rem;
  border-radius: var(--radius-pill);
  transition: background var(--transition), transform var(--transition);
}

.btn:hover {
  background: var(--accent-hover);
  color: #fff;
  transform: translateY(-1px);
}

/* ===== Footer ===== */
.footer {
  padding: 2rem 0;
  border-top: 1px solid var(--border);
  font-size: 0.8rem;
  color: var(--ink-tertiary);
}

.footer .shell {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.footer a {
  color: var(--ink-secondary);
}

.footer a:hover {
  color: var(--accent);
}

.footer-sep {
  opacity: 0.3;
}

/* ===== Responsive ===== */
@media (max-width: 1100px) {
  .col-update {
    display: none;
  }
}

@media (max-width: 960px) {
  .tag-section {
    display: none;
  }

  .tag-source {
    display: none;
  }
}

@media (max-width: 680px) {
  .hero {
    min-height: auto;
    padding: 2rem 0;
  }

  .nav {
    margin-bottom: 2.5rem;
  }

  .hero-content h1 {
    font-size: 2.25rem;
  }

  .hero-stats {
    flex-wrap: wrap;
    gap: 0.5rem 1rem;
  }

  .col-num {
    display: none;
  }

  .col-stars {
    display: none;
  }

  .col-tags {
    display: none;
  }

  .mobile-category {
    display: block;
    font-size: 0.75rem;
    color: var(--ink-tertiary);
    font-weight: 400;
    margin-top: 0.125rem;
  }

  .expand-content {
    padding: 0.75rem 1rem;
  }

  .controls {
    flex-direction: column;
  }

  .search-wrap {
    min-width: auto;
  }
}

@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}