/* awesome-world-action-models — design system
   Motif: solid = observed, dashed = imagined. Five pathway colors, validated
   for CVD separation and contrast in both modes (see docs in repo). */

:root {
  color-scheme: light;
  --bg: #f6f7f9;
  --surface: #ffffff;
  --ink: #15171b;
  --ink-2: #4b5158;
  --muted: #646b76;
  --line: #e4e7eb;
  --line-strong: #cfd4da;
  --accent: #4a3aa7;
  --accent-soft: #eceafa;
  --code-bg: #f0f1f4;

  --c-world-models: #2a78d6;
  --c-video-world-models: #eb6834;
  --c-vla: #1baf7a;
  --c-unified-wam: #4a3aa7;
  --c-evaluation: #e87ba4;

  --font-display: "Archivo", system-ui, sans-serif;
  --font-body: "Archivo", system-ui, sans-serif;
  --font-serif: "Source Serif 4", Georgia, serif;
  --font-mono: "IBM Plex Mono", ui-monospace, "SF Mono", monospace;

  --container: 1120px;
  --radius: 10px;
}

@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark;
    --bg: #0e1013;
    --surface: #161920;
    --ink: #eef0f3;
    --ink-2: #b3b9c2;
    --muted: #868c96;
    --line: #262b33;
    --line-strong: #38404b;
    --accent: #9085e9;
    --accent-soft: #24213b;
    --code-bg: #1d212a;

    --c-world-models: #3987e5;
    --c-video-world-models: #d95926;
    --c-vla: #199e70;
    --c-unified-wam: #9085e9;
    --c-evaluation: #d55181;
  }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }
a:focus-visible, button:focus-visible, input:focus-visible, summary:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 3px;
}

.container { max-width: var(--container); margin: 0 auto; padding: 0 24px; }

/* ---------- nav ---------- */

.site-nav {
  position: sticky; top: 0; z-index: 40;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.site-nav .container {
  display: flex; align-items: center; gap: 28px;
  height: 60px;
}
.wordmark {
  display: flex; align-items: center; gap: 10px;
  font-family: var(--font-display);
  font-weight: 700; font-size: 15px; letter-spacing: 0.01em;
  color: var(--ink);
}
.wordmark:hover { text-decoration: none; }
.wordmark svg { display: block; }
.nav-links { display: flex; gap: 4px; margin-left: auto; }
.nav-links a {
  color: var(--ink-2);
  font-size: 14px; font-weight: 500;
  padding: 6px 12px; border-radius: 6px;
}
.nav-links a:hover { color: var(--ink); background: var(--surface); text-decoration: none; }
.nav-links a[aria-current="page"] { color: var(--ink); font-weight: 600; }
.nav-links a[aria-current="page"]::after {
  content: ""; display: block; height: 2px; margin-top: 1px;
  background: var(--accent); border-radius: 1px;
}
.nav-gh { margin-left: 8px; color: var(--ink-2); display: flex; align-items: center; }
.nav-gh:hover { color: var(--ink); }

@media (max-width: 720px) {
  .site-nav .container { height: auto; flex-wrap: wrap; padding-top: 10px; padding-bottom: 10px; gap: 10px; }
  .nav-links { margin-left: 0; width: 100%; overflow-x: auto; }
}

/* ---------- type ---------- */

.eyebrow {
  font-family: var(--font-display);
  font-size: 12px; font-weight: 600;
  letter-spacing: 0.14em; text-transform: uppercase;
  font-stretch: 112%;
  color: var(--accent);
  margin: 0 0 14px;
}
h1 {
  font-family: var(--font-display);
  font-weight: 800; font-stretch: 108%;
  font-size: clamp(34px, 5.5vw, 58px);
  line-height: 1.05; letter-spacing: -0.015em;
  margin: 0 0 18px;
}
h2 {
  font-family: var(--font-display);
  font-weight: 700; font-stretch: 106%;
  font-size: clamp(24px, 3vw, 32px);
  line-height: 1.15; letter-spacing: -0.01em;
  margin: 0 0 12px;
}
h3 {
  font-family: var(--font-display);
  font-weight: 650;
  font-size: 19px; line-height: 1.3;
  margin: 0 0 8px;
}
.lede {
  font-family: var(--font-serif);
  font-size: clamp(17px, 2vw, 20px);
  line-height: 1.6;
  color: var(--ink-2);
  max-width: 62ch;
  margin: 0 0 8px;
}
.prose { font-family: var(--font-serif); font-size: 17px; line-height: 1.7; color: var(--ink-2); max-width: 68ch; }
.prose strong { color: var(--ink); }
.mono { font-family: var(--font-mono); font-size: 12.5px; }

/* ---------- sections ---------- */

.section { padding: 64px 0; }
.section + .section { border-top: 1px dashed var(--line-strong); }
.section-head { margin-bottom: 32px; }

.hero { padding: 72px 0 40px; }
.hero-grid { display: grid; grid-template-columns: 1.1fr 1fr; gap: 48px; align-items: center; }
@media (max-width: 900px) { .hero-grid { grid-template-columns: 1fr; } }
.hero .lede { margin-bottom: 22px; }

.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; }
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--font-display); font-weight: 600; font-size: 14px;
  padding: 10px 18px; border-radius: 8px;
  border: 1px solid var(--line-strong);
  color: var(--ink); background: var(--surface);
  cursor: pointer;
}
.btn:hover { border-color: var(--accent); text-decoration: none; }
.btn-primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn-primary:hover { filter: brightness(1.08); }
@media (prefers-color-scheme: dark) { .btn-primary { color: #0e1013; } }

/* stats strip */
.stats { display: flex; gap: 40px; flex-wrap: wrap; margin-top: 34px; }
.stat .stat-n { font-family: var(--font-display); font-weight: 800; font-size: 28px; line-height: 1; }
.stat .stat-l { font-family: var(--font-mono); font-size: 11.5px; color: var(--muted); margin-top: 5px; letter-spacing: 0.04em; }

/* ---------- cards ---------- */

.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px;
}
.card-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 16px; }
.card h3 a { color: var(--ink); }
.card .mono { color: var(--muted); }
.card p { margin: 8px 0 0; font-size: 14.5px; color: var(--ink-2); }

/* pathway rows on home */
.pathway-row {
  display: grid; grid-template-columns: 14px 220px 1fr auto; gap: 18px; align-items: baseline;
  padding: 18px 4px; border-top: 1px solid var(--line);
}
.pathway-row:last-child { border-bottom: 1px solid var(--line); }
.pathway-row .dot { position: relative; top: 1px; }
.pathway-row h3 { margin: 0; font-size: 16.5px; }
.pathway-row h3 a { color: var(--ink); }
.pathway-row p { margin: 0; font-size: 14.5px; color: var(--ink-2); }
.pathway-row .count { font-family: var(--font-mono); font-size: 12px; color: var(--muted); white-space: nowrap; }
@media (max-width: 780px) {
  .pathway-row { grid-template-columns: 14px 1fr auto; }
  .pathway-row p { grid-column: 2 / -1; }
}

.dot {
  display: inline-block; width: 10px; height: 10px; border-radius: 50%;
  background: var(--pc, var(--muted));
  box-shadow: inset 0 0 0 1px rgba(0,0,0,0.12);
  flex: none;
}

/* eras strip */
.eras { display: grid; grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); gap: 0; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; background: var(--surface); }
.era { padding: 20px; border-left: 1px dashed var(--line-strong); }
.era:first-child { border-left: none; }
.era .mono { color: var(--accent); }
.era h3 { margin: 6px 0 6px; font-size: 16px; }
.era p { margin: 0; font-size: 13.5px; color: var(--ink-2); }

/* agent loop */
.loop { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; font-family: var(--font-mono); font-size: 13px; margin: 20px 0; }
.loop .step { background: var(--surface); border: 1px solid var(--line-strong); border-radius: 999px; padding: 6px 14px; }
.loop .arrow { color: var(--muted); }

/* ---------- papers page ---------- */

.controls {
  position: sticky; top: 60px; z-index: 30;
  background: color-mix(in srgb, var(--bg) 92%, transparent);
  backdrop-filter: blur(10px);
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
  display: flex; flex-wrap: wrap; gap: 10px; align-items: center;
}
@media (max-width: 720px) { .controls { top: 0; position: static; } }
.search {
  flex: 1 1 220px; max-width: 340px;
  font: 14px var(--font-body);
  color: var(--ink); background: var(--surface);
  border: 1px solid var(--line-strong); border-radius: 8px;
  padding: 8px 12px;
}
.search::placeholder { color: var(--muted); }
.chips { display: flex; gap: 8px; flex-wrap: wrap; }
.chip {
  display: inline-flex; align-items: center; gap: 7px;
  font: 500 13px var(--font-body);
  color: var(--ink-2); background: var(--surface);
  border: 1px solid var(--line-strong); border-radius: 999px;
  padding: 6px 13px; cursor: pointer;
}
.chip:hover { color: var(--ink); }
.chip[aria-pressed="true"] {
  color: var(--ink); border-color: var(--pc, var(--accent));
  box-shadow: inset 0 0 0 1px var(--pc, var(--accent));
}
.view-toggle { margin-left: auto; display: flex; border: 1px solid var(--line-strong); border-radius: 8px; overflow: hidden; }
.view-toggle button {
  font: 600 13px var(--font-display);
  color: var(--ink-2); background: var(--surface);
  border: none; padding: 8px 14px; cursor: pointer;
}
.view-toggle button[aria-pressed="true"] { background: var(--accent); color: #fff; }
@media (prefers-color-scheme: dark) { .view-toggle button[aria-pressed="true"] { color: #0e1013; } }

.pathway-section { padding: 44px 0 10px; }
.pathway-head { display: flex; align-items: baseline; gap: 12px; margin-bottom: 6px; }
.pathway-head .dot { width: 12px; height: 12px; }
.pathway-head h2 { margin: 0; }
.pathway-head .count { font-family: var(--font-mono); font-size: 12.5px; color: var(--muted); }
.pathway-narrative { margin: 10px 0 26px; }

.paper-list { display: grid; gap: 12px; }
.paper {
  background: var(--surface);
  border: 1px solid var(--line);
  border-left: 3px solid var(--pc, var(--line-strong));
  border-radius: var(--radius);
  padding: 16px 20px;
}
.paper:target { box-shadow: 0 0 0 2px var(--accent); }
.paper-top { display: flex; gap: 12px; align-items: baseline; flex-wrap: wrap; }
.paper h3 { margin: 0; font-size: 16.5px; flex: 1 1 auto; }
.paper h3 a { color: var(--ink); }
.paper-meta { font-family: var(--font-mono); font-size: 12px; color: var(--muted); white-space: nowrap; }
.paper-one-line { margin: 6px 0 0; font-size: 14.5px; color: var(--ink-2); }
.paper-foot { display: flex; gap: 14px; align-items: center; flex-wrap: wrap; margin-top: 10px; }
.paper-links { display: flex; gap: 12px; font: 500 13px var(--font-body); }
.tag { font-family: var(--font-mono); font-size: 11px; color: var(--muted); background: var(--code-bg); border-radius: 4px; padding: 2px 7px; }
.builds-on { font-family: var(--font-mono); font-size: 11.5px; color: var(--muted); }
.builds-on a { color: var(--ink-2); border-bottom: 1px dashed var(--line-strong); }
.builds-on a:hover { color: var(--accent); text-decoration: none; }
.paper details { margin-top: 8px; }
.paper summary { cursor: pointer; font: 500 13px var(--font-body); color: var(--accent); list-style: none; }
.paper summary::before { content: "+ "; }
.paper details[open] summary::before { content: "− "; }
.paper details p { margin: 6px 0 0; font-family: var(--font-serif); font-size: 14.5px; color: var(--ink-2); max-width: 72ch; }

.empty-note { padding: 48px 0; color: var(--muted); font-size: 15px; }

/* ---------- timeline map ---------- */

.map-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); margin-top: 24px; }
.map-svg { display: block; min-width: 1280px; width: 100%; height: auto; }
.map-svg .lane-label { font: 600 12px var(--font-display); fill: var(--ink-2); }
.map-svg .year-tick { font: 11px var(--font-mono); fill: var(--muted); }
.map-svg .grid-line { stroke: var(--line); stroke-width: 1; }
.map-svg .edge { fill: none; stroke: var(--line-strong); stroke-width: 1.2; opacity: 0.7; }
.map-svg .edge.cross { stroke: var(--accent); stroke-dasharray: 4 4; opacity: 0.55; }
.map-svg .node { cursor: pointer; }
.map-svg .node circle { stroke: var(--surface); stroke-width: 2; }
.map-svg .node text { font: 10.5px var(--font-mono); fill: var(--ink-2); }
.map-svg .node:hover circle { stroke: var(--ink); }
.map-legend { display: flex; gap: 18px; flex-wrap: wrap; padding: 14px 18px; border-top: 1px dashed var(--line-strong); font: 500 13px var(--font-body); color: var(--ink-2); }
.map-legend span { display: inline-flex; align-items: center; gap: 7px; }
.map-hint { font-family: var(--font-mono); font-size: 11.5px; color: var(--muted); padding: 0 18px 14px; }

.map-tip {
  position: fixed; z-index: 60; pointer-events: none;
  max-width: 320px;
  background: var(--surface); border: 1px solid var(--line-strong); border-radius: 8px;
  box-shadow: 0 6px 24px rgba(0,0,0,0.14);
  padding: 10px 14px; font-size: 13px; color: var(--ink-2);
}
.map-tip .t { font-weight: 600; color: var(--ink); }
.map-tip .m { font-family: var(--font-mono); font-size: 11px; color: var(--muted); margin-top: 2px; }

/* ---------- code blocks ---------- */

pre {
  background: var(--code-bg);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 14px 18px;
  overflow-x: auto;
  font-family: var(--font-mono); font-size: 13px; line-height: 1.55;
  color: var(--ink);
}
code { font-family: var(--font-mono); font-size: 0.92em; background: var(--code-bg); border-radius: 4px; padding: 1px 5px; }
pre code { background: none; padding: 0; }

/* ---------- skills / mcp / discussion shared ---------- */

.chain { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; margin: 24px 0 34px; }
.chain .step {
  font-family: var(--font-mono); font-size: 13px;
  background: var(--surface); border: 1px solid var(--line-strong);
  border-radius: 8px; padding: 8px 14px;
}
.chain .step.aux { border-style: dashed; color: var(--ink-2); }
.chain .arrow { color: var(--muted); font-family: var(--font-mono); }

.tool-row { display: grid; grid-template-columns: 200px 1fr; gap: 18px; padding: 16px 4px; border-top: 1px solid var(--line); }
.tool-row:last-of-type { border-bottom: 1px solid var(--line); }
.tool-row .mono { color: var(--accent); font-weight: 500; }
.tool-row p { margin: 0; font-size: 14.5px; color: var(--ink-2); }
@media (max-width: 640px) { .tool-row { grid-template-columns: 1fr; gap: 4px; } }

.qr-card {
  display: flex; gap: 28px; align-items: center; flex-wrap: wrap;
  background: var(--surface); border: 1px dashed var(--line-strong);
  border-radius: var(--radius); padding: 28px;
}
.qr-card img, .qr-card svg { border-radius: 8px; }

.callout {
  border-left: 3px solid var(--accent);
  background: var(--accent-soft);
  border-radius: 0 8px 8px 0;
  padding: 14px 18px;
  font-size: 14.5px; color: var(--ink-2);
  margin: 20px 0;
}
.callout strong { color: var(--ink); }

/* ---------- footer ---------- */

.site-footer { border-top: 1px solid var(--line); margin-top: 72px; padding: 32px 0 48px; }
.site-footer .container { display: flex; flex-wrap: wrap; gap: 18px; justify-content: space-between; align-items: baseline; }
.site-footer p { margin: 0; font-size: 13.5px; color: var(--muted); }
.site-footer a { color: var(--ink-2); }
.site-footer .mono { font-size: 11.5px; }

/* hero convergence svg */
.converge { width: 100%; height: auto; }
.converge .lane { fill: none; stroke-width: 2.5; }
.converge .future { fill: none; stroke: var(--accent); stroke-width: 2.5; stroke-dasharray: 6 7; }
.converge .lane-tag { font: 600 11px var(--font-display); fill: var(--ink-2); }
.converge .now-line { stroke: var(--line-strong); stroke-width: 1; stroke-dasharray: 2 4; }
.converge .now-label { font: 10.5px var(--font-mono); fill: var(--muted); }
@media (prefers-reduced-motion: no-preference) {
  .converge .lane {
    stroke-dasharray: 620; stroke-dashoffset: 620;
    animation: draw 1.4s cubic-bezier(0.4, 0, 0.2, 1) forwards;
  }
  .converge .lane:nth-child(2) { animation-delay: 0.08s; }
  .converge .lane:nth-child(3) { animation-delay: 0.16s; }
  .converge .lane:nth-child(4) { animation-delay: 0.24s; }
  .converge .lane:nth-child(5) { animation-delay: 0.32s; }
  .converge .future { opacity: 0; animation: fadein 0.7s ease 1.35s forwards; }
}
@keyframes draw { to { stroke-dashoffset: 0; } }
@keyframes fadein { to { opacity: 1; } }

.paper, .pathway-section, .section[id] { scroll-margin-top: 140px; }

.skip-link {
  position: absolute; left: -9999px; top: 0;
  background: var(--accent); color: #fff; padding: 8px 16px; z-index: 100;
}
.skip-link:focus { left: 12px; top: 12px; }