:root {
  color-scheme: light;
  --canvas: oklch(0.968 0.012 90);
  --paper: oklch(0.988 0.007 90);
  --ink: oklch(0.25 0.025 255);
  --muted: oklch(0.51 0.025 255);
  --line: oklch(0.86 0.018 90);
  --line-strong: oklch(0.74 0.025 90);
  --accent: oklch(0.51 0.13 245);
  --accent-soft: oklch(0.92 0.035 245);
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --shadow-card: 0 1px 3px rgba(29, 36, 51, 0.1);
  --page-width: 1120px;
  --demo-page: #f4f2ec;
  --demo-panel: #fffdf8;
  --demo-sidebar: #ebe8df;
  --demo-card: #ffffff;
  --demo-code: #202936;
  --demo-text: #1d2433;
  --demo-muted: #6e7685;
  --demo-accent: #3169a8;
  --demo-border: #d7d2c7;
  --demo-code-text: #dce8f6;
}
* { 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: -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC", "Noto Sans SC", sans-serif; font-size: 16px; line-height: 1.75; }
button, a { touch-action: manipulation; }
button, input { font: inherit; }
a { color: inherit; }
button:focus-visible, a:focus-visible, summary:focus-visible { outline: 3px solid color-mix(in oklch, var(--accent) 42%, transparent); 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% - 40px)); margin-inline: auto; }
.site-nav { display: flex; align-items: center; justify-content: space-between; min-height: 68px; border-bottom: 1px solid var(--line); }
.brand { display: inline-flex; align-items: center; gap: 10px; min-height: 44px; font-weight: 760; text-decoration: none; }
.brand-mark { display: grid; place-items: center; width: 36px; height: 32px; border-radius: var(--radius-md); background: var(--ink); color: var(--paper); font: 700 11px ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; letter-spacing: .08em; }
.nav-links { display: flex; align-items: center; gap: 28px; }
.nav-links a { min-height: 44px; display: inline-flex; align-items: center; color: var(--muted); font-size: 14px; text-decoration: none; }
.hero { display: block; padding: clamp(72px, 10vw, 126px) 0 clamp(84px, 11vw, 132px); }
.hero-copy { max-width: 920px; }
.kicker, .section-number, .demo-head span { margin: 0; color: var(--accent); font: 650 11px ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; letter-spacing: .17em; }
.hero h1, .section-heading h2 { text-wrap: balance; }
.hero h1 { max-width: 820px; margin: 18px 0 22px; font-size: clamp(42px, 6.6vw, 78px); font-weight: 820; line-height: 1.08; }
.hero h1 span { color: var(--muted); }
.hero-lead { max-width: 62ch; margin: 0 0 26px; color: var(--muted); font-size: 17px; text-wrap: pretty; }
.text-link { display: inline-flex; align-items: center; gap: 9px; min-height: 44px; color: var(--ink); font-weight: 720; text-underline-offset: 6px; text-decoration-thickness: 1px; }
.text-link span { color: var(--accent); }
.section { padding: clamp(74px, 9vw, 108px) 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: 38px; }
.section-heading h2 { margin: 8px 0 0; font-size: clamp(30px, 4.4vw, 50px); line-height: 1.16; }
.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: 8px; margin-bottom: 18px; }
.filter-button, .demo-tab, #copyDemo { min-height: 40px; border: 1px solid var(--line); border-radius: var(--radius-md); background: var(--paper); color: var(--muted); cursor: pointer; transition: transform 160ms ease-out, 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(--line-strong); }
.project-card { display: grid; grid-template-columns: 64px minmax(0, 1fr) 150px 36px; gap: 22px; align-items: center; min-height: 130px; padding: 25px 14px 25px 0; border-bottom: 1px solid var(--line); text-decoration: none; transition: transform 180ms cubic-bezier(.16,1,.3,1), background-color 180ms ease-out; }
.project-rank { align-self: start; color: var(--accent); font: 12px ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-variant-numeric: tabular-nums; }
.project-card h3 { margin: 0 0 6px; font-size: clamp(19px, 2.2vw, 25px); line-height: 1.25; }
.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 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-variant-numeric: tabular-nums; }
.project-meta strong { font-size: 15px; }
.project-meta span { color: var(--muted); }
.project-arrow { color: var(--accent); font-size: 22px; transition: transform 180ms cubic-bezier(.16,1,.3,1); }
.empty-projects { padding: 44px 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: 42px minmax(0, 1fr); gap: 14px; padding: 0 0 24px; }
.steps li > span { color: var(--accent); font: 11px ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-variant-numeric: tabular-nums; }
.steps h3 { margin: -7px 0 4px; font-size: 17px; }
.steps p, .safety-note p { margin: 0; color: var(--muted); font-size: 14px; text-wrap: pretty; }
.safety-note { margin-top: 8px; padding: 18px; border: 1px solid var(--line); border-radius: var(--radius-lg); background: color-mix(in oklch, var(--paper) 80%, var(--accent-soft)); }
.safety-note strong { display: block; margin-bottom: 5px; }
.demo-panel { position: sticky; top: 24px; overflow: hidden; border: 1px solid var(--line); border-radius: var(--radius-lg); background: var(--paper); box-shadow: var(--shadow-card); }
.demo-head, .token-row { display: flex; align-items: center; justify-content: space-between; gap: 18px; padding: 16px 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 10px; 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) 16%, var(--demo-panel)); 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: 8px; height: 8px; 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-md); 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) 58%, var(--demo-border)); }
.preview-main pre { min-height: 130px; margin: 0; padding: 15px; overflow: auto; border-radius: var(--radius-md); background: var(--demo-code); color: var(--demo-code-text); font: 11px/1.65 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; white-space: pre-wrap; }
.token-row { justify-content: flex-start; border-top: 1px solid var(--line); }
.token-row > span { width: 24px; height: 24px; border-radius: 50%; background: var(--swatch); outline: 1px solid rgba(29,36,51,.16); outline-offset: -1px; }
#copyDemo { margin-left: auto; padding: 0 13px; font-size: 12px; }
footer { display: flex; justify-content: space-between; gap: 24px; padding: 24px 0 38px; border-top: 1px solid var(--line); color: var(--muted); font: 10px ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; letter-spacing: .06em; }
@media (hover: hover) {
  .nav-links a:hover, .text-link:hover { color: var(--accent); }
  .filter-button:hover, .demo-tab:hover, #copyDemo:hover { border-color: var(--line-strong); color: var(--ink); transform: translateY(-1px); }
  .filter-button.is-active:hover, .demo-tab.is-active:hover { color: var(--paper); }
  .project-card:hover { background: color-mix(in oklch, var(--paper) 78%, var(--accent-soft)); transform: translateX(5px); }
  .project-card:hover .project-arrow { transform: translateX(4px); }
}
.filter-button:active, .demo-tab:active, #copyDemo:active, .project-card:active { transform: scale(.98); }
@media (max-width: 820px) {
  .section-heading, .mechanism-layout { grid-template-columns: 1fr; }
  .hero { gap: 52px; }
  .section-heading { gap: 18px; }
  .project-card { grid-template-columns: 42px minmax(0, 1fr) 120px 28px; gap: 14px; }
  .mechanism-layout { gap: 44px; }
  .demo-panel { position: static; }
}
@media (max-width: 560px) {
  .site-nav, main, footer { width: min(var(--page-width), calc(100% - 24px)); }
  .site-nav { min-height: 60px; }
  .nav-links { gap: 12px; }
  .nav-links a { font-size: 12px; }
  .hero { padding-top: 58px; }
  .hero h1 { font-size: clamp(38px, 12vw, 56px); }
  .filter-bar { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .project-card { grid-template-columns: 34px minmax(0, 1fr) 22px; padding-right: 4px; }
  .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%; }
  .token-row { gap: 10px; padding-inline: 12px; }
  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; }
}