/* ── Design tokens ── */
:root {
  --bg-deep: #05080f;
  --bg-base: #0a0f1a;
  --bg-elevated: #0f1629;
  --surface: rgba(15, 22, 42, 0.65);
  --surface-strong: rgba(20, 30, 55, 0.8);
  --surface-hover: rgba(25, 38, 70, 0.7);
  --glass: rgba(255, 255, 255, 0.04);
  --glass-border: rgba(255, 255, 255, 0.08);

  --ink: #e8ecf4;
  --ink-secondary: #9ba4b8;
  --muted: #606d84;
  --border: rgba(255, 255, 255, 0.06);

  --accent: #6366f1;
  --accent-bright: #818cf8;
  --accent-glow: rgba(99, 102, 241, 0.25);
  --cyan: #22d3ee;
  --cyan-glow: rgba(34, 211, 238, 0.2);
  --emerald: #34d399;
  --emerald-glow: rgba(52, 211, 153, 0.15);
  --rose: #fb7185;
  --amber: #fbbf24;
  --amber-glow: rgba(251, 191, 36, 0.15);

  --gradient-primary: linear-gradient(135deg, #6366f1, #8b5cf6, #a855f7);
  --gradient-accent: linear-gradient(135deg, #22d3ee, #6366f1);
  --gradient-warm: linear-gradient(135deg, #f97316, #fb7185);
  --gradient-aurora: linear-gradient(
    135deg,
    rgba(99, 102, 241, 0.15),
    rgba(139, 92, 246, 0.1),
    rgba(34, 211, 238, 0.08),
    rgba(52, 211, 153, 0.06)
  );

  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 8px 32px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 24px 64px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 40px rgba(99, 102, 241, 0.12);

  --radius-xl: 24px;
  --radius-lg: 18px;
  --radius-md: 14px;
  --radius-sm: 10px;

  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-smooth: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-spring: 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: "Space Grotesk", "Inter", system-ui, sans-serif;
  color: var(--ink);
  background: var(--bg-deep);
  line-height: 1.6;
  overflow-x: hidden;
}

/* ── Animated mesh background ── */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -2;
  background:
    radial-gradient(ellipse 80% 60% at 10% 15%, rgba(99, 102, 241, 0.12), transparent 50%),
    radial-gradient(ellipse 60% 50% at 85% 10%, rgba(34, 211, 238, 0.08), transparent 45%),
    radial-gradient(ellipse 70% 55% at 50% 80%, rgba(139, 92, 246, 0.06), transparent 50%),
    radial-gradient(ellipse 50% 40% at 75% 60%, rgba(52, 211, 153, 0.05), transparent 40%);
  animation: meshDrift 20s ease-in-out infinite alternate;
}

body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    repeating-linear-gradient(
      0deg,
      transparent,
      transparent 120px,
      rgba(255, 255, 255, 0.012) 120px,
      rgba(255, 255, 255, 0.012) 121px
    ),
    repeating-linear-gradient(
      90deg,
      transparent,
      transparent 120px,
      rgba(255, 255, 255, 0.012) 120px,
      rgba(255, 255, 255, 0.012) 121px
    );
  pointer-events: none;
}

@keyframes meshDrift {
  0% {
    transform: scale(1) rotate(0deg);
  }
  100% {
    transform: scale(1.1) rotate(3deg);
  }
}

/* ── Scrollbar ── */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}
::-webkit-scrollbar-track {
  background: transparent;
}
::-webkit-scrollbar-thumb {
  background: rgba(99, 102, 241, 0.3);
  border-radius: 100px;
}
::-webkit-scrollbar-thumb:hover {
  background: rgba(99, 102, 241, 0.5);
}

img {
  max-width: 100%;
  display: block;
}

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

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

/* ── Tables ── */
table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
}

th,
td {
  padding: 0.75rem 1rem;
  text-align: left;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}

th {
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
  background: rgba(99, 102, 241, 0.05);
  position: sticky;
  top: 0;
}

tr {
  transition: background var(--transition-fast);
}

tbody tr:hover {
  background: rgba(99, 102, 241, 0.06);
}

td {
  color: var(--ink-secondary);
}

/* ── Page shell ── */
.page-shell {
  width: min(1400px, calc(100vw - 48px));
  margin: 0 auto;
  padding: 24px 0 72px;
}

/* ── Hero ── */
.hero {
  position: relative;
  padding: 2px;
  border-radius: calc(var(--radius-xl) + 4px);
  background: linear-gradient(
    135deg,
    rgba(99, 102, 241, 0.4),
    rgba(34, 211, 238, 0.2),
    rgba(139, 92, 246, 0.3),
    rgba(52, 211, 153, 0.2)
  );
  background-size: 300% 300%;
  animation: borderGlow 8s ease-in-out infinite;
  overflow: hidden;
  min-height: 520px;
}

.hero::before {
  content: "";
  position: absolute;
  inset: 2px;
  border-radius: calc(var(--radius-xl) + 2px);
  background: linear-gradient(
    160deg,
    rgba(10, 15, 30, 0.55),
    rgba(15, 22, 42, 0.5),
    rgba(10, 18, 35, 0.6)
  );
  z-index: 1;
  pointer-events: none;
}

.hero > * {
  position: relative;
  z-index: 2;
}

.plane-3d-bg {
  z-index: 0 !important;
}

@keyframes borderGlow {
  0%,
  100% {
    background-position: 0% 50%;
  }
  50% {
    background-position: 100% 50%;
  }
}

/* ── Topbar ── */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 20px;
  margin: 16px 16px 0;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--glass-border);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}

.brand {
  font-weight: 700;
  letter-spacing: 0.04em;
  font-size: 0.95rem;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-links {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.nav-links a {
  padding: 6px 14px;
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--ink-secondary);
  transition: all var(--transition-fast);
}

.nav-links a:hover {
  background: rgba(99, 102, 241, 0.12);
  color: var(--accent-bright);
}

/* ── Hero grid ── */
.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.3fr) minmax(340px, 0.7fr);
  gap: 32px;
  padding: 44px 24px 24px;
  position: relative;
  z-index: 2;
}

.hero-copy h1,
.section-heading h2 {
  margin: 0;
  font-family: "Instrument Serif", Georgia, serif;
  font-weight: 400;
  line-height: 0.92;
}

.hero-copy h1 {
  font-size: clamp(3rem, 7vw, 5.8rem);
  max-width: 11ch;
  background: linear-gradient(to right, #e8ecf4 20%, var(--accent-bright) 50%, var(--cyan) 80%);
  background-size: 200% auto;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: shimmerText 6s linear infinite;
}

@keyframes shimmerText {
  0% {
    background-position: 0% center;
  }
  100% {
    background-position: 200% center;
  }
}

.hero-subtitle {
  max-width: 62ch;
  font-size: 1rem;
  line-height: 1.7;
  margin-top: 20px;
  color: var(--ink-secondary);
}

.eyebrow {
  margin: 0 0 14px;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  font-size: 0.7rem;
  font-weight: 700;
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stack-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 28px;
}

.stack-pill,
.chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border-radius: 999px;
  padding: 8px 16px;
  background: rgba(99, 102, 241, 0.08);
  border: 1px solid rgba(99, 102, 241, 0.15);
  color: var(--accent-bright);
  font-size: 0.82rem;
  font-weight: 500;
  transition: all var(--transition-fast);
}

.stack-pill:hover,
.chip:hover {
  background: rgba(99, 102, 241, 0.15);
  border-color: rgba(99, 102, 241, 0.3);
  transform: translateY(-1px);
}

/* ── Glass cards ── */
.hero-panel,
.card,
.explorer-item {
  border-radius: var(--radius-lg);
  border: 1px solid var(--glass-border);
  background: var(--surface);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  box-shadow: var(--shadow-md);
  transition: all var(--transition-smooth);
}

.hero-panel:hover,
.card:hover {
  border-color: rgba(99, 102, 241, 0.15);
  box-shadow: var(--shadow-lg), var(--shadow-glow);
  transform: translateY(-2px);
}

.hero-panel {
  padding: 24px;
}

.panel-label {
  margin: 0 0 18px;
  color: var(--muted);
  text-transform: uppercase;
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  font-weight: 600;
}

.panel-footnote {
  margin-top: 18px;
  font-size: 0.85rem;
  color: var(--muted);
  line-height: 1.6;
}

/* ── Grids ── */
.hero-metrics,
.metric-grid,
.mini-metric-grid,
.chart-grid,
.featured-table-grid,
.split-grid {
  display: grid;
  gap: 16px;
}

.hero-metrics {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.metric-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.mini-metric-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.split-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-top: 16px;
}

.chart-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.featured-table-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

/* ── Sections ── */
.section {
  margin-top: 56px;
  animation: fadeSlideIn 0.8s ease-out both;
}

.section-heading {
  margin-bottom: 24px;
}

.section-heading h2 {
  font-size: clamp(2rem, 5vw, 3.6rem);
  max-width: 14ch;
  color: var(--ink);
}

.section-heading p {
  color: var(--muted);
}

@keyframes fadeSlideIn {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ── Cards ── */
.card,
.explorer-item {
  padding: 22px;
}

.card-header h3,
.explorer-summary h3 {
  margin: 0;
  font-size: 1.05rem;
  font-weight: 600;
}

.card-header p {
  margin: 8px 0 0;
  line-height: 1.6;
  font-size: 0.92rem;
  color: var(--ink-secondary);
}

/* ── Metric cards ── */
.metric-card,
.mini-metric,
.leader-card {
  padding: 18px;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--glass-border);
  transition: all var(--transition-smooth);
  position: relative;
  overflow: hidden;
}

.metric-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--gradient-primary);
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.metric-card:hover::before {
  opacity: 1;
}

.metric-card:hover,
.mini-metric:hover,
.leader-card:hover {
  background: rgba(99, 102, 241, 0.06);
  border-color: rgba(99, 102, 241, 0.15);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(99, 102, 241, 0.1);
}

/* ── Accent card (navy panel) ── */
.accent-card {
  background: linear-gradient(
    145deg,
    rgba(99, 102, 241, 0.15),
    rgba(139, 92, 246, 0.1),
    rgba(15, 22, 42, 0.9)
  );
  border-color: rgba(99, 102, 241, 0.2);
}

.accent-card .card-header p,
.accent-card .stat-meta,
.accent-card .stat-label {
  color: var(--ink-secondary);
}

.accent-card .leader-card {
  background: rgba(99, 102, 241, 0.08);
  border-color: rgba(99, 102, 241, 0.15);
}

/* ── Labels & values ── */
.metric-label,
.mini-label,
.leader-label,
.stat-label,
.explorer-meta,
.chart-meta {
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.03em;
}

.metric-value,
.mini-value,
.leader-value,
.stat-value {
  margin-top: 8px;
  font-size: clamp(1.4rem, 3vw, 2.2rem);
  font-weight: 700;
  line-height: 1;
  background: linear-gradient(135deg, var(--ink), var(--accent-bright));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.metric-caption,
.leader-meta {
  margin-top: 10px;
  font-size: 0.84rem;
  color: var(--muted);
}

/* ── Table scroll ── */
.table-scroll {
  overflow-x: auto;
  margin-top: 16px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
}

/* ── Chart cards ── */
.chart-card {
  overflow: hidden;
  padding: 0 !important;
}

.chart-card img {
  width: 100%;
  border-bottom: 1px solid var(--border);
  transition: transform var(--transition-smooth);
  filter: brightness(0.92) contrast(1.05);
}

.chart-card:hover img {
  transform: scale(1.02);
  filter: brightness(1) contrast(1.05);
}

.chart-copy {
  padding: 20px;
}

.chart-copy h3 {
  margin: 0;
  font-weight: 600;
}

.chart-copy p {
  margin: 8px 0 0;
  color: var(--ink-secondary);
  line-height: 1.6;
  font-size: 0.9rem;
}

/* ── ML section ── */
.model-list,
.stat-list,
.feature-bars {
  display: grid;
  gap: 12px;
}

.feature-row {
  display: grid;
  gap: 6px;
  transition: transform var(--transition-fast);
}

.feature-row:hover {
  transform: translateX(4px);
}

.feature-head {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  font-size: 0.88rem;
}

.feature-head strong {
  color: var(--ink);
}

.feature-head span {
  color: var(--accent-bright);
  font-weight: 600;
}

.feature-track {
  width: 100%;
  height: 8px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.06);
  overflow: hidden;
}

.feature-fill {
  height: 100%;
  border-radius: inherit;
  background: var(--gradient-accent);
  box-shadow: 0 0 12px var(--accent-glow);
  transition: width 1.2s cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* ── Explorer ── */
.explorer-toolbar {
  display: grid;
  gap: 16px;
}

.search-label {
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--ink-secondary);
}

#output-search {
  width: 100%;
  padding: 14px 18px;
  border-radius: var(--radius-md);
  border: 1px solid var(--glass-border);
  background: rgba(255, 255, 255, 0.04);
  backdrop-filter: blur(10px);
  font: inherit;
  color: var(--ink);
  font-size: 0.92rem;
  transition: all var(--transition-fast);
  outline: none;
}

#output-search::placeholder {
  color: var(--muted);
}

#output-search:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
  background: rgba(99, 102, 241, 0.04);
}

.chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.chip {
  cursor: pointer;
  font-weight: 500;
}

.chip.is-active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
  box-shadow: 0 4px 16px var(--accent-glow);
}

.output-count {
  margin: 14px 2px 0;
  color: var(--muted);
  font-size: 0.88rem;
  font-weight: 500;
}

.explorer-item {
  margin-top: 14px;
}

.explorer-item[open] {
  background: rgba(99, 102, 241, 0.04);
  border-color: rgba(99, 102, 241, 0.12);
}

.explorer-summary {
  cursor: pointer;
  list-style: none;
  padding: 4px 0;
}

.explorer-summary::-webkit-details-marker {
  display: none;
}

.explorer-summary::marker {
  display: none;
  content: "";
}

.explorer-topline {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px;
  align-items: baseline;
}

.explorer-note {
  margin: 14px 0 0;
  padding: 14px;
  border-radius: var(--radius-sm);
  background: rgba(99, 102, 241, 0.06);
  border: 1px solid rgba(99, 102, 241, 0.1);
  color: var(--accent-bright);
  line-height: 1.6;
  font-size: 0.9rem;
}

.muted-empty {
  padding: 24px;
  border-radius: var(--radius-md);
  border: 1px dashed rgba(255, 255, 255, 0.1);
  color: var(--muted);
  text-align: center;
}

/* ── Intersection observer animations ── */
.animate-on-scroll {
  opacity: 0;
  transform: translateY(32px);
  transition: opacity 0.7s ease-out, transform 0.7s ease-out;
}

.animate-on-scroll.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* ── Loading shimmer for dynamic content ── */
@keyframes pulse {
  0%,
  100% {
    opacity: 1;
  }
  50% {
    opacity: 0.6;
  }
}

/* ── Counter animation ── */
@keyframes countUp {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.metric-value,
.mini-value,
.leader-value,
.stat-value {
  animation: countUp 0.6s ease-out both;
}

/* ── Responsive ── */
@media (max-width: 1100px) {
  .hero-grid,
  .split-grid,
  .chart-grid,
  .featured-table-grid,
  .metric-grid {
    grid-template-columns: 1fr;
  }

  .hero-metrics,
  .mini-metric-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 720px) {
  .page-shell {
    width: min(100vw - 16px, 100%);
    padding-top: 12px;
  }

  .topbar {
    border-radius: var(--radius-lg);
    flex-direction: column;
    align-items: stretch;
    gap: 10px;
    margin: 10px 10px 0;
  }

  .nav-links {
    justify-content: center;
  }

  .hero-grid {
    padding: 24px 14px 14px;
    gap: 20px;
  }

  .hero-copy h1 {
    font-size: clamp(2.4rem, 14vw, 3.8rem);
  }

  .hero-metrics,
  .mini-metric-grid {
    grid-template-columns: 1fr;
  }

  .card,
  .explorer-item,
  .hero-panel {
    padding: 16px;
  }

  .section {
    margin-top: 36px;
  }

  .metric-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* ── Footer signature ── */
.footer-sig {
  text-align: center;
  padding: 48px 0 24px;
  color: var(--muted);
  font-size: 0.8rem;
  letter-spacing: 0.04em;
}

.footer-sig span {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  font-weight: 600;
}

/* ── 3D Plane Background ── */
.plane-3d-bg {
  position: absolute;
  inset: 2px;
  border-radius: calc(var(--radius-xl) + 2px);
  overflow: hidden;
  z-index: 0;
  pointer-events: none;
}

.plane-3d-bg canvas {
  display: block;
  width: 100% !important;
  height: 100% !important;
}

.plane-fallback-image {
  position: absolute;
  inset: 10% 8% 14%;
  width: 84%;
  height: 76%;
  object-fit: contain;
  opacity: 0.28;
  filter: drop-shadow(0 20px 50px rgba(34, 211, 238, 0.12));
  animation: floatPlaneFallback 6s ease-in-out infinite;
}

/* ── Loader ── */
.plane-loader {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  z-index: 10;
  background: rgba(8, 12, 24, 0.5);
  backdrop-filter: blur(4px);
  transition: opacity 0.8s ease-out;
}

.plane-loader.is-static {
  background: linear-gradient(180deg, rgba(8, 12, 24, 0.18), rgba(8, 12, 24, 0.42));
}

.plane-loader p {
  color: var(--ink-secondary);
  font-size: 0.85rem;
  font-weight: 500;
  letter-spacing: 0.04em;
}

.plane-loader-spinner {
  width: 40px;
  height: 40px;
  border: 3px solid rgba(99, 102, 241, 0.15);
  border-top-color: var(--accent-bright);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

@keyframes floatPlaneFallback {
  0%,
  100% {
    transform: translateY(0px) rotate(-2deg);
  }
  50% {
    transform: translateY(-10px) rotate(1deg);
  }
}