/* ============================================================
   Tokens
   ============================================================ */
:root {
  color-scheme: light;

  --page:        #F3F7F7;
  --surface:     #FCFDFD;
  --surface-2:   #EAF1F1;
  --ink:         #0B1B24;
  --ink-2:       #4C5D62;
  --ink-muted:   #7C8F93;
  --grid:        #DCE6E6;
  --baseline:    #BFD0D1;
  --border:      rgba(11,27,36,0.10);
  --good:        #0ca30c;

  --accent:      #E85E30;   /* tag orange -- signature / CTA */
  --accent-ink:  #FFFFFF;
  --kelp:        #1BAF7A;   /* validated aqua slot -- brand + chart reuse */

  /* validated categorical order (dataviz skill reference palette) */
  --s1: #2a78d6; /* blue    */
  --s2: #008300; /* green   */
  --s3: #e87ba4; /* magenta */
  --s4: #eda100; /* yellow  */
  --s5: #1baf7a; /* aqua    */
  --s6: #eb6834; /* orange  */
  --s7: #4a3aa7; /* violet  */
  --s8: #e34948; /* red     */

  --div-cold: #2a78d6; /* diverging: growth pole   */
  --div-warm: #e34948; /* diverging: decline pole  */
  --div-mid:  #f0efec; /* diverging: neutral       */

  --font-display: 'Space Grotesk', 'Segoe UI', system-ui, sans-serif;
  --font-body: 'Inter', 'Segoe UI', system-ui, sans-serif;
  --font-mono: 'IBM Plex Mono', ui-monospace, 'SFMono-Regular', Menlo, monospace;

  --radius-s: 8px;
  --radius-m: 16px;
  --radius-l: 28px;
  --radius-pill: 999px;

  --shadow-card: 0 1px 2px rgba(11,27,36,0.06), 0 8px 24px -12px rgba(11,27,36,0.18);
}

@media (prefers-color-scheme: dark) {
  :root:where(:not([data-theme="light"])) {
    color-scheme: dark;
    --page:      #081720;
    --surface:   #102838;
    --surface-2: #0D2130;
    --ink:       #F3F7F6;
    --ink-2:     #B9CBCC;
    --ink-muted: #8C9FA1;
    --grid:      #24333B;
    --baseline:  #34464E;
    --border:    rgba(243,247,246,0.12);
    --good:      #0ca30c;

    --accent:     #FF8B5C;
    --accent-ink: #0B1B24;
    --kelp:       #199e70;

    --s1: #3987e5; --s2: #008300; --s3: #d55181; --s4: #c98500;
    --s5: #199e70; --s6: #d95926; --s7: #9085e9; --s8: #e66767;

    --div-cold: #3987e5;
    --div-warm: #e66767;
    --div-mid:  #383835;

    --shadow-card: 0 1px 2px rgba(0,0,0,0.3), 0 12px 32px -16px rgba(0,0,0,0.55);
  }
}
:root[data-theme="dark"] {
  color-scheme: dark;
  --page:      #081720;
  --surface:   #102838;
  --surface-2: #0D2130;
  --ink:       #F3F7F6;
  --ink-2:     #B9CBCC;
  --ink-muted: #8C9FA1;
  --grid:      #24333B;
  --baseline:  #34464E;
  --border:    rgba(243,247,246,0.12);
  --good:      #0ca30c;

  --accent:     #FF8B5C;
  --accent-ink: #0B1B24;
  --kelp:       #199e70;

  --s1: #3987e5; --s2: #008300; --s3: #d55181; --s4: #c98500;
  --s5: #199e70; --s6: #d95926; --s7: #9085e9; --s8: #e66767;

  --div-cold: #3987e5;
  --div-warm: #e66767;
  --div-mid:  #383835;

  --shadow-card: 0 1px 2px rgba(0,0,0,0.3), 0 12px 32px -16px rgba(0,0,0,0.55);
}

/* ============================================================
   Reset & base
   ============================================================ */
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; }
}

body {
  margin: 0;
  background: var(--page);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

h1, h2, h3, h4 { font-family: var(--font-display); font-weight: 700; line-height: 1.08; margin: 0 0 0.4em; letter-spacing: -0.01em; }
p { margin: 0 0 1em; color: var(--ink-2); }
a { color: inherit; }
img, svg { max-width: 100%; display: block; }

.wrap {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 28px;
}

section { padding: 96px 0; position: relative; }
@media (max-width: 720px) { section { padding: 64px 0; } }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-muted);
  background: var(--surface-2);
  border: 1px solid var(--border);
  padding: 5px 12px 5px 10px;
  border-radius: var(--radius-pill);
  margin-bottom: 20px;
}
.eyebrow::before {
  content: '';
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--accent);
  flex: none;
}

.section-head { max-width: 700px; margin-bottom: 48px; }
.section-head h2 { font-size: clamp(28px, 4vw, 42px); }
.section-head .lede { font-size: 17px; max-width: 60ch; }

/* ============================================================
   Nav
   ============================================================ */
.topnav {
  position: sticky; top: 0; z-index: 50;
  backdrop-filter: blur(14px) saturate(1.4);
  background: color-mix(in srgb, var(--page) 78%, transparent);
  border-bottom: 1px solid var(--border);
}
.topnav .wrap { display: flex; align-items: center; justify-content: space-between; padding-top: 14px; padding-bottom: 14px; }
.brand { display: flex; align-items: center; gap: 10px; font-family: var(--font-display); font-weight: 700; font-size: 16.5px; text-decoration: none; color: var(--ink); }
.brand .mark { width: 30px; height: 30px; flex: none; }
.navlinks { display: flex; gap: 4px; align-items: center; }
.navlinks a {
  text-decoration: none; font-size: 14px; font-weight: 500; color: var(--ink-2);
  padding: 8px 12px; border-radius: var(--radius-pill); transition: background .15s, color .15s;
  white-space: nowrap;
}
.navlinks a:hover { background: var(--surface-2); color: var(--ink); }
.navlinks { display: none; }
@media (min-width: 980px) { .navlinks { display: flex; } }
.theme-btn {
  border: 1px solid var(--border); background: var(--surface); color: var(--ink);
  width: 36px; height: 36px; border-radius: 50%; cursor: pointer; flex: none;
  display: flex; align-items: center; justify-content: center; margin-left: 6px;
}
.theme-btn svg { width: 17px; height: 17px; }

/* ============================================================
   Buttons / tags
   ============================================================ */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--font-body); font-weight: 600; font-size: 14.5px;
  padding: 12px 20px; border-radius: var(--radius-pill);
  text-decoration: none; border: 1px solid transparent; cursor: pointer;
  transition: transform .15s ease, box-shadow .15s ease;
}
.btn:hover { transform: translateY(-1px); }
.btn-primary { background: var(--accent); color: var(--accent-ink); }
.btn-primary:hover { box-shadow: 0 10px 24px -10px color-mix(in srgb, var(--accent) 70%, transparent); }
.btn-ghost { background: transparent; border-color: var(--border); color: var(--ink); }
.btn-ghost:hover { background: var(--surface-2); }

.tag {
  font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.02em;
  padding: 4px 10px; border-radius: var(--radius-pill);
  border: 1px solid var(--border); color: var(--ink-2); background: var(--surface);
  display: inline-block;
}
.tag.hot { color: var(--accent); border-color: color-mix(in srgb, var(--accent) 45%, var(--border)); }

/* ============================================================
   Hero
   ============================================================ */
.hero {
  padding: 64px 0 40px;
  position: relative;
  overflow: hidden;
}
.hero-grid {
  display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 40px; align-items: center;
}
@media (max-width: 900px) { .hero-grid { grid-template-columns: 1fr; } }

.hero h1 {
  font-size: clamp(38px, 5.6vw, 68px);
  letter-spacing: -0.02em;
}
.hero h1 .hl { color: var(--accent); }
.hero .lede { font-size: 18.5px; max-width: 52ch; }
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 28px; }

.stat-row { display: grid; grid-template-columns: repeat(3, auto); gap: 28px; margin-top: 44px; }
@media (max-width: 560px) { .stat-row { grid-template-columns: 1fr 1fr; } }
.stat-row .stat b {
  display: block; font-family: var(--font-display); font-size: 28px; color: var(--ink);
}
.stat-row .stat span {
  font-size: 12.5px; color: var(--ink-muted); font-family: var(--font-mono); letter-spacing: 0.02em;
}

.hero-scene { position: relative; aspect-ratio: 1 / 1; max-width: 480px; margin: 0 auto; }
.hero-scene svg { width: 100%; height: 100%; }
.seal-bob { animation: bob 5.5s ease-in-out infinite; transform-origin: 50% 70%; }
@keyframes bob { 0%,100% { transform: translateY(0) rotate(0deg); } 50% { transform: translateY(-8px) rotate(-1.2deg); } }
.whisker-twitch { animation: twitch 3.2s ease-in-out infinite; transform-origin: right center; }
@keyframes twitch { 0%, 40%, 100% { transform: rotate(0deg); } 20% { transform: rotate(2.5deg); } }

/* ============================================================
   Cards / grids
   ============================================================ */
.grid { display: grid; gap: 20px; }
.grid-2 { grid-template-columns: 1fr 1fr; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 900px) { .grid-3, .grid-4 { grid-template-columns: 1fr 1fr; } }
@media (max-width: 620px) { .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; } }

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-m);
  padding: 24px;
  box-shadow: var(--shadow-card);
}
.card h3 { font-size: 16.5px; margin-bottom: 8px; }
.card .meta { font-family: var(--font-mono); font-size: 12px; color: var(--ink-muted); margin-bottom: 10px; }
.card p { font-size: 14.5px; margin-bottom: 0; }
.card .foot { margin-top: 14px; display: flex; gap: 8px; flex-wrap: wrap; }

.data-card .n { font-family: var(--font-display); font-size: 30px; color: var(--accent); }

/* ============================================================
   Chart shells
   ============================================================ */
.chart-card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-l);
  padding: 26px 26px 18px; box-shadow: var(--shadow-card);
}
.chart-card h3 { font-size: 17px; margin-bottom: 4px; }
.chart-card .chart-sub { font-size: 13.5px; color: var(--ink-muted); margin-bottom: 18px; max-width: 62ch; }
.chart-body { position: relative; }
.chart-body svg { overflow: visible; }
.chart-body text { font-family: var(--font-mono); fill: var(--ink-muted); }

.legend { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 10px; font-size: 12.5px; font-family: var(--font-mono); color: var(--ink-2); }
.legend .li { display: flex; align-items: center; gap: 6px; }
.legend .sw { width: 10px; height: 10px; border-radius: 3px; flex: none; }

.tooltip {
  position: absolute; pointer-events: none; z-index: 5;
  background: var(--ink); color: var(--page);
  font-family: var(--font-mono); font-size: 12px; line-height: 1.5;
  padding: 8px 10px; border-radius: 10px; box-shadow: 0 8px 20px rgba(0,0,0,0.25);
  transform: translate(-50%, calc(-100% - 12px));
  white-space: nowrap; opacity: 0; transition: opacity .1s ease;
}
.tooltip.show { opacity: 1; }
.tooltip .tt-title { color: color-mix(in srgb, var(--page) 70%, var(--accent)); font-weight: 600; margin-bottom: 2px; }

.callout {
  border-left: 3px solid var(--accent);
  background: var(--surface-2);
  border-radius: 0 var(--radius-s) var(--radius-s) 0;
  padding: 16px 18px;
  font-size: 14.5px;
  color: var(--ink-2);
  margin-top: 18px;
}
.callout b { color: var(--ink); }
.callout.good { border-left-color: var(--kelp); }

/* ============================================================
   Tables
   ============================================================ */
table.data-table { width: 100%; border-collapse: collapse; font-size: 13.5px; }
table.data-table th, table.data-table td {
  text-align: left; padding: 9px 10px; border-bottom: 1px solid var(--grid);
  font-variant-numeric: tabular-nums;
}
table.data-table th { font-family: var(--font-mono); font-size: 11.5px; text-transform: uppercase; letter-spacing: .05em; color: var(--ink-muted); font-weight: 500; }
table.data-table td.num { font-family: var(--font-mono); }
table.data-table tr.sig td:first-child { position: relative; padding-left: 18px; }
table.data-table tr.sig td:first-child::before {
  content: ''; position: absolute; left: 0; top: 50%; transform: translateY(-50%);
  width: 7px; height: 7px; border-radius: 50%; background: var(--kelp);
}

/* ============================================================
   Model comparison strip
   ============================================================ */
.model-row {
  display: grid; grid-template-columns: 200px 1fr 90px; gap: 14px; align-items: center;
  padding: 10px 0; border-bottom: 1px solid var(--grid); font-size: 13.5px;
}
.model-row:last-child { border-bottom: none; }
.model-row .name { font-weight: 600; }
.model-row .name .best { color: var(--kelp); font-family: var(--font-mono); font-size: 11px; margin-left: 6px; }
.model-row .bar-track { height: 10px; background: var(--grid); border-radius: 6px; position: relative; overflow: visible; }
.model-row .bar-fill { position: absolute; top: 0; bottom: 0; border-radius: 6px; }
.model-row .val { font-family: var(--font-mono); text-align: right; }

/* ============================================================
   Footer / team
   ============================================================ */
footer { padding: 60px 0 80px; border-top: 1px solid var(--border); margin-top: 40px; }
.team-row { display: flex; flex-wrap: wrap; gap: 10px; margin: 18px 0 32px; }
.team-chip {
  font-family: var(--font-mono); font-size: 13px; padding: 8px 14px; border-radius: var(--radius-pill);
  border: 1px solid var(--border); background: var(--surface);
}
.foot-links { display: flex; gap: 18px; flex-wrap: wrap; font-size: 13.5px; }
.foot-links a { text-decoration: none; color: var(--ink-2); }
.foot-links a:hover { color: var(--accent); }
.fine { font-size: 12.5px; color: var(--ink-muted); margin-top: 26px; }

/* ============================================================
   Misc
   ============================================================ */
.divider { height: 1px; background: var(--border); border: none; margin: 0; }
.kicker-num { font-family: var(--font-mono); color: var(--ink-muted); font-size: 13px; }
.text-accent { color: var(--accent); }
.text-kelp { color: var(--kelp); }

.reveal { opacity: 0; transform: translateY(14px); transition: opacity .6s ease, transform .6s ease; }
.reveal.in { opacity: 1; transform: translateY(0); }

.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
@media (max-width: 860px) { .two-col { grid-template-columns: 1fr; } }

a:focus-visible, button:focus-visible {
  outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 6px;
}