:root {
  color-scheme: light;
  --canvas: #faf8f2;
  --paper: #fffefa;
  --ink: #201d17;
  --muted: #75705f;
  --line: #e7e2d4;
  --line-strong: #d6d0bd;
  --accent: #b0421f;
  --accent-ink: #96371a;
  --radius-sm: 2px;
  --radius-md: 3px;
  --radius-lg: 4px;
  --page-width: 1080px;
  --font-sans: -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC", "Noto Sans SC", sans-serif;
  --font-serif: "Charter", "Bitstream Charter", "Sitka Text", Cambria, "Songti SC", "Noto Serif SC", serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --demo-page: #f4f1e9;
  --demo-panel: #fbf9f3;
  --demo-sidebar: #ede9dd;
  --demo-card: #fffefa;
  --demo-code: #efebdf;
  --demo-text: #262319;
  --demo-muted: #7c7666;
  --demo-accent: #b0421f;
  --demo-border: #ddd7c6;
  --demo-code-text: #3a3527;
}
* { box-sizing: border-box; }
html { min-width: 320px; scroll-behavior: smooth; -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }
body {
  margin: 0;
  min-height: 100vh;
  background: var(--canvas);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
}
::selection { background: var(--ink); color: var(--canvas); }
button, a { touch-action: manipulation; }
button, input { font: inherit; }
a { color: inherit; }
button:focus-visible, a:focus-visible, summary:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }
.skip-link { position: fixed; z-index: 20; top: 10px; left: 10px; padding: 8px 12px; background: var(--ink); color: var(--paper); transform: translateY(-160%); transition: transform 160ms ease-out; }
.skip-link:focus { transform: translateY(0); }
.site-nav, main, footer { width: min(var(--page-width), calc(100% - 48px)); margin-inline: auto; }
.site-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 76px;
  border-bottom: 1px solid var(--ink);
}
.brand { display: inline-flex; align-items: center; gap: 12px; min-height: 44px; font-weight: 700; text-decoration: none; }
.brand-mark {
  display: grid;
  place-items: center;
  width: 34px;
  height: 30px;
  border: 1.5px solid var(--ink);
  border-radius: var(--radius-sm);
  color: var(--ink);
  font: 700 11px var(--font-mono);
  letter-spacing: .06em;
}
.nav-links { display: flex; align-items: center; gap: 30px; }
.nav-links a { min-height: 44px; display: inline-flex; align-items: center; color: var(--muted); font-size: 14px; text-decoration: none; transition: color 160ms ease-out; }
.hero { display: block; padding: clamp(84px, 12vw, 152px) 0 clamp(88px, 12vw, 148px); }
.hero-copy { max-width: 920px; }
.kicker, .section-number, .demo-head span { margin: 0; color: var(--accent); font: 650 11px var(--font-mono); letter-spacing: .18em; }
.hero h1, .section-heading h2 { text-wrap: balance; }
.hero h1 {
  max-width: 800px;
  margin: 20px 0 26px;
  font-family: var(--font-serif);
  font-size: clamp(44px, 6.8vw, 80px);
  font-weight: 500;
  line-height: 1.12;
  letter-spacing: -0.01em;
}
.hero h1 span { color: var(--muted); }
.hero-lead { max-width: 60ch; margin: 0 0 34px; color: var(--muted); font-size: 17px; text-wrap: pretty; }
.text-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 44px;
  color: var(--ink);
  font-weight: 650;
  font-size: 15px;
  text-decoration: none;
  border-bottom: 1px solid var(--ink);
  padding-bottom: 2px;
  transition: color 160ms ease-out, border-color 160ms ease-out;
}
.text-link span { color: var(--accent); }
.section { padding: clamp(72px, 9vw, 104px) 0; border-top: 1px solid var(--line); }
.section-heading { display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(280px, .85fr); gap: clamp(34px, 7vw, 92px); align-items: end; margin-bottom: 40px; }
.section-heading h2 { margin: 10px 0 0; font-family: var(--font-serif); font-weight: 500; font-size: clamp(30px, 4.4vw, 48px); line-height: 1.18; letter-spacing: -0.01em; }
.section-heading > p { max-width: 52ch; margin: 0; color: var(--muted); font-size: 14px; text-wrap: pretty; }
.filter-bar { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 26px; }
.filter-button, .demo-tab, #copyDemo {
  min-height: 38px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  transition: border-color 160ms ease-out, color 160ms ease-out, background-color 160ms ease-out;
}
.filter-button { padding: 0 15px; font-size: 13px; }
.filter-button.is-active, .demo-tab.is-active { border-color: var(--ink); background: var(--ink); color: var(--paper); }
.project-list { border-top: 1px solid var(--ink); }
.project-card {
  display: grid;
  grid-template-columns: 60px minmax(0, 1fr) 140px 32px;
  gap: 24px;
  align-items: center;
  min-height: 124px;
  padding: 26px 4px;
  border-bottom: 1px solid var(--line);
  text-decoration: none;
  transition: background-color 160ms ease-out;
}
.project-card[hidden] { display: none; }
.project-rank { align-self: start; padding-top: 5px; color: var(--accent); font: 12px var(--font-mono); font-variant-numeric: tabular-nums; }
.project-card h3 { margin: 0 0 6px; font-family: var(--font-serif); font-weight: 500; font-size: clamp(19px, 2.2vw, 24px); line-height: 1.28; }
.project-card p { max-width: 68ch; margin: 0; color: var(--muted); font-size: 14px; text-wrap: pretty; }
.project-meta { display: grid; gap: 5px; justify-items: start; font: 11px var(--font-mono); font-variant-numeric: tabular-nums; }
.project-meta strong { font-size: 15px; font-weight: 650; }
.project-meta span { color: var(--muted); }
.project-arrow { color: var(--muted); font-size: 20px; transition: transform 180ms cubic-bezier(.16,1,.3,1), color 160ms ease-out; }
.empty-projects { padding: 44px 4px; margin: 0; color: var(--muted); }
.mechanism-layout { display: grid; grid-template-columns: minmax(0, .82fr) minmax(480px, 1.18fr); gap: clamp(36px, 7vw, 80px); align-items: start; }
.steps { list-style: none; margin: 0; padding: 0; }
.steps li { display: grid; grid-template-columns: 40px minmax(0, 1fr); gap: 14px; padding: 0 0 26px; }
.steps li > span { color: var(--accent); font: 11px var(--font-mono); font-variant-numeric: tabular-nums; }
.steps h3 { margin: -6px 0 4px; font-size: 16px; font-weight: 650; }
.steps p, .safety-note p { margin: 0; color: var(--muted); font-size: 14px; text-wrap: pretty; }
.safety-note { margin-top: 10px; padding: 18px 20px; border: 1px solid var(--line-strong); border-left: 2px solid var(--accent); border-radius: var(--radius-sm); background: var(--paper); }
.safety-note strong { display: block; margin-bottom: 5px; font-size: 14px; }
.demo-panel {
  position: sticky;
  top: 32px;
  overflow: hidden;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-md);
  background: var(--paper);
}
.demo-head { display: flex; align-items: center; justify-content: space-between; gap: 18px; padding: 15px 18px; }
.demo-head { border-bottom: 1px solid var(--line); }
.demo-head > div:first-child { display: grid; gap: 2px; }
.demo-head strong { font-size: 14px; }
.demo-tabs { display: flex; gap: 6px; }
.demo-tab { min-width: 52px; padding: 0 11px; font-size: 12px; }
.codex-preview { display: grid; grid-template-columns: 148px minmax(0, 1fr); min-height: 402px; background: var(--demo-page); color: var(--demo-text); transition: background-color 180ms ease-out, color 180ms ease-out; }
.codex-preview aside { display: flex; flex-direction: column; gap: 7px; padding: 22px 14px; border-right: 1px solid var(--demo-border); background: var(--demo-sidebar); transition: background-color 180ms ease-out, border-color 180ms ease-out; }
.codex-preview aside b { margin-bottom: 14px; font-size: 13px; }
.preview-nav { padding: 8px 9px; border-radius: var(--radius-sm); color: var(--demo-muted); font-size: 11px; }
.preview-nav.is-current { background: color-mix(in srgb, var(--demo-accent) 12%, transparent); color: var(--demo-text); }
.preview-main { display: flex; flex-direction: column; gap: 13px; min-width: 0; padding: 20px; }
.preview-status { display: flex; align-items: center; gap: 8px; color: var(--demo-muted); }
.preview-status span { width: 7px; height: 7px; border-radius: 50%; background: var(--demo-accent); }
.preview-user, .preview-agent { max-width: 88%; margin: 0; padding: 11px 13px; border: 1px solid var(--demo-border); border-radius: var(--radius-sm); background: var(--demo-card); font-size: 12px; line-height: 1.6; }
.preview-user { align-self: flex-end; border-color: color-mix(in srgb, var(--demo-accent) 45%, var(--demo-border)); }
.preview-main pre { min-height: 130px; margin: 0; padding: 15px; overflow: auto; border: 1px solid var(--demo-border); border-radius: var(--radius-sm); background: var(--demo-code); color: var(--demo-code-text); font: 11px/1.65 var(--font-mono); white-space: pre-wrap; }
.theme-lab { border-top: 1px solid var(--line); }
.theme-lab-head { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 15px 18px 12px; }
.theme-lab-head > div { display: grid; gap: 2px; }
.theme-lab-head span:first-child { color: var(--accent); font: 650 10px var(--font-mono); letter-spacing: .14em; }
.theme-lab-head strong { font-size: 13px; font-weight: 650; }
.lab-status { min-height: 18px; color: var(--muted); font: 11px var(--font-mono); }
.theme-controls { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.theme-control { display: grid; grid-template-columns: 1fr auto; grid-template-rows: auto auto; gap: 2px 10px; min-width: 0; padding: 12px 14px; border-right: 1px solid var(--line); cursor: pointer; }
.theme-control:last-child { border-right: 0; }
.theme-control > span { color: var(--muted); font-size: 12px; }
.theme-control output { grid-column: 1; color: var(--ink); font: 10px var(--font-mono); font-variant-numeric: tabular-nums; }
.theme-control input { grid-column: 2; grid-row: 1 / span 2; align-self: center; width: 30px; height: 30px; padding: 0; border: 0; border-radius: 50%; background: none; cursor: pointer; }
.theme-control input::-webkit-color-swatch-wrapper { padding: 0; }
.theme-control input::-webkit-color-swatch { border: 1px solid rgba(32, 29, 23, .18); border-radius: 50%; }
.theme-control input::-moz-color-swatch { border: 1px solid rgba(32, 29, 23, .18); border-radius: 50%; }
.theme-actions { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 12px 18px; }
.copy-actions { display: flex; gap: 7px; }
.lab-button { min-height: 38px; padding: 0 12px; border: 1px solid var(--line-strong); border-radius: var(--radius-sm); background: transparent; color: var(--muted); cursor: pointer; font-size: 12px; transition: border-color 160ms ease-out, color 160ms ease-out, background-color 160ms ease-out; }
footer { display: flex; justify-content: space-between; gap: 24px; padding: 26px 0 40px; border-top: 1px solid var(--line); color: var(--muted); font: 10px var(--font-mono); letter-spacing: .08em; }
@media (hover: hover) {
  .nav-links a:hover { color: var(--accent); }
  .text-link:hover { color: var(--accent); border-color: var(--accent); }
  .filter-button:hover, .demo-tab:hover, .lab-button:hover { border-color: var(--ink); color: var(--ink); }
  .filter-button.is-active:hover, .demo-tab.is-active:hover { color: var(--paper); }
  .project-card:hover { background: var(--paper); }
  .project-card:hover .project-arrow { color: var(--accent); transform: translate(3px, -3px); }
}
.filter-button:active, .demo-tab:active, .lab-button:active, .project-card:active { transform: scale(.99); }
@media (max-width: 820px) {
  .section-heading, .mechanism-layout { grid-template-columns: 1fr; }
  .section-heading { gap: 18px; }
  .project-card { grid-template-columns: 40px minmax(0, 1fr) 110px 26px; gap: 16px; }
  .mechanism-layout { gap: 44px; }
  .demo-panel { position: static; }
}
@media (max-width: 560px) {
  .site-nav, main, footer { width: min(var(--page-width), calc(100% - 28px)); }
  .site-nav { min-height: 64px; }
  .nav-links { gap: 14px; }
  .nav-links a { font-size: 12px; }
  .hero { padding-top: 60px; }
  .hero h1 { font-size: clamp(36px, 11vw, 52px); }
  .filter-bar { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .project-card { grid-template-columns: 32px minmax(0, 1fr) 22px; padding: 20px 2px; }
  .project-meta { grid-column: 2; grid-row: 2; grid-auto-flow: column; justify-content: start; align-items: center; gap: 9px; }
  .project-arrow { grid-column: 3; grid-row: 1 / span 2; }
  .demo-head { align-items: stretch; flex-direction: column; }
  .demo-tabs { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .codex-preview { grid-template-columns: 88px minmax(0, 1fr); min-height: 360px; }
  .codex-preview aside { padding: 16px 8px; }
  .preview-main { padding: 14px 10px; }
  .preview-user, .preview-agent { max-width: 100%; }
  .theme-controls { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .theme-control:nth-child(2) { border-right: 0; }
  .theme-control:nth-child(-n + 2) { border-bottom: 1px solid var(--line); }
  .theme-actions { align-items: stretch; flex-direction: column; }
  .copy-actions { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .lab-button { width: 100%; }
  footer { flex-direction: column; gap: 8px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
}