:root {
  --ink: #1c140e;
  --mute: #6b5a48;
  --paper: #f4ece1;
  --paper-2: #fff8ef;
  --deep: #24180f;
  --amber: #c47a32;
  --amber-2: #e0a056;
  --sea: #3a6a72;
  --hot: #b54a2a;
  --ok: #3d7a4a;
  --line: rgba(28, 20, 14, 0.12);
  --glass: rgba(255, 248, 239, 0.58);
  --foil: linear-gradient(135deg, #c47a32, #7aa3aa, #e0a056, #3a6a72);
  --serif: "Noto Serif SC", "Songti SC", serif;
  --sans: "Noto Sans SC", "PingFang SC", sans-serif;
  --shadow: 0 22px 48px rgba(36, 24, 15, 0.22);
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
section[id] { scroll-margin-top: 92px; }
body { margin: 0; color: var(--ink); background: var(--paper); font-family: var(--sans); font-size: 16px; line-height: 1.75; }
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
.app-link, .live { color: var(--amber); border-bottom: 1px solid rgba(196, 122, 50, 0.4); font-style: italic; }
footer .app-link { color: var(--amber-2); border-bottom-color: rgba(224, 160, 86, 0.5); }
button { font-family: inherit; cursor: pointer; }
code { font-family: ui-monospace, "SF Mono", Menlo, monospace; font-size: 0.92em; background: rgba(196, 122, 50, 0.12); padding: 0.05em 0.35em; }
.grain { pointer-events: none; position: fixed; inset: 0; z-index: 50; opacity: 0.12; background-image: url("images/texture.webp"); background-size: 520px auto; mix-blend-mode: multiply; }
.skip { position: absolute; left: -999px; }
.skip:focus { left: 12px; top: 12px; z-index: 70; background: var(--paper-2); padding: 8px 12px; }
.nav { position: fixed; top: 14px; left: 50%; transform: translateX(-50%); z-index: 40; width: min(1180px, calc(100% - 24px)); display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 8px 10px 8px 14px; border-radius: 999px; background: var(--glass); backdrop-filter: blur(22px) saturate(1.5); border: 1px solid rgba(255, 255, 255, 0.55); box-shadow: 0 10px 40px rgba(36, 24, 15, 0.12), inset 0 1px 0 rgba(255, 255, 255, 0.7); }
.brand { display: flex; align-items: center; gap: 10px; font-family: var(--serif); font-weight: 700; letter-spacing: 0.04em; }
.brand small { display: block; font-family: var(--sans); font-weight: 400; font-size: 11px; letter-spacing: 0.14em; color: var(--mute); }
.seal { width: 36px; height: 36px; display: grid; place-items: center; border-radius: 50%; color: var(--paper-2); background: var(--amber); }
.nav-toggle { display: none; background: transparent; border: 1px solid var(--amber); color: var(--amber); padding: 6px 12px; border-radius: 99px; }
.nav-links { display: flex; gap: 14px; align-items: center; font-size: 13px; }
.nav-links a { color: var(--mute); padding: 4px 2px; }
.nav-links a.is-active, .nav-links a:hover { color: var(--amber); }
.nav-links .live { padding: 6px 12px; border: 1px solid var(--amber); border-radius: 99px; color: var(--amber); }
.hero { position: relative; min-height: 100vh; display: grid; align-items: end; overflow: hidden; color: #fff8ef; }
.hero img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; animation: drift 28s ease-in-out infinite alternate; }
@keyframes drift { from { transform: scale(1); } to { transform: scale(1.06); } }
.hero::after { content: ""; position: absolute; inset: 0; background: radial-gradient(80% 60% at 80% 20%, rgba(196, 122, 50, 0.2), transparent 50%), linear-gradient(180deg, rgba(36, 24, 15, 0.12) 0%, rgba(36, 24, 15, 0.5) 50%, rgba(36, 24, 15, 0.92) 100%); }
.hero-inner { position: relative; z-index: 1; padding: 12vh 8vw 10vh; max-width: 980px; }
.kicker, .vlabel { letter-spacing: 0.22em; font-size: 12px; color: var(--amber-2); margin: 0 0 12px; }
.vlabel { color: var(--amber); font-style: italic; }
h1, h2, h3 { font-family: var(--serif); font-weight: 700; line-height: 1.08; margin: 0 0 16px; }
h1 { font-size: clamp(46px, 8.4vw, 104px); letter-spacing: -0.04em; }
h2 { font-size: clamp(28px, 4vw, 44px); }
h3 { font-size: 22px; }
.lead { font-size: 18px; max-width: 42em; color: rgba(255, 248, 239, 0.88); }
.meta-row { display: flex; flex-wrap: wrap; gap: 8px; margin: 22px 0; }
.chip { border: 1px solid rgba(255, 248, 239, 0.35); padding: 4px 10px; font-size: 12px; letter-spacing: 0.08em; border-radius: 99px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; }
.btn { display: inline-flex; align-items: center; justify-content: center; padding: 10px 18px; border: 1px solid currentColor; font-size: 14px; border-radius: 99px; }
.btn-fill { background: var(--amber); color: var(--deep); border-color: var(--amber); }
.btn-ghost { background: transparent; color: inherit; }
.wrap { width: min(1120px, calc(100% - 48px)); margin: 0 auto; padding: 96px 0; }
.section-head { display: grid; grid-template-columns: 140px 1fr; gap: 24px; margin-bottom: 40px; }
.section-head p:last-child { color: var(--mute); margin: 0; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.card, .bench { background: linear-gradient(var(--paper-2), var(--paper-2)) padding-box, var(--foil) border-box; border: 1px solid transparent; padding: 22px 22px 18px; border-radius: 28px; }
.card { min-height: 220px; }
.stamp { display: inline-block; font-size: 11px; letter-spacing: 0.16em; color: var(--sea); border: 1px solid var(--sea); padding: 2px 8px; margin-bottom: 10px; font-style: italic; border-radius: 99px; }
.card ul, .io-grid ul, .rule-list { margin: 0; padding-left: 1.1em; }
.card li, .io-grid li, .rule-list li { margin: 0.35em 0; }
.alt { background: linear-gradient(180deg, #e7dccb 0%, var(--paper) 100%); }
.step { display: grid; grid-template-columns: 1fr 1fr; gap: 36px; align-items: center; margin-bottom: 72px; }
.step.reverse { direction: rtl; }
.step.reverse > * { direction: ltr; }
.num { font-family: var(--serif); font-style: italic; font-size: 28px; color: var(--amber); display: block; margin-bottom: 8px; }
figure { margin: 0; }
figure img { width: 100%; height: 320px; object-fit: cover; border-radius: 28px; box-shadow: var(--shadow); }
figcaption { margin-top: 10px; font-size: 13px; color: var(--mute); font-style: italic; }
.demo { margin-top: 22px; padding: 14px 16px; border-radius: 18px; border: 1px dashed rgba(58, 106, 114, 0.45); background: rgba(58, 106, 114, 0.08); }
.demo p { margin: 0 0 8px; }
.demo-meta { display: flex; justify-content: space-between; gap: 12px; align-items: center; }
.clock-track { height: 14px; background: rgba(28, 20, 14, 0.08); overflow: hidden; border-radius: 99px; }
.clock-track i { display: block; height: 100%; width: 60%; background: linear-gradient(90deg, var(--sea), var(--amber)); }
.ok { color: var(--ok); }
.warn { color: var(--hot); }
.bench-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.bench h3 { font-size: 18px; margin-bottom: 8px; }
.bench p { margin: 0; color: var(--mute); font-size: 14px; }
.rule-list { font-size: 17px; max-width: 46em; }
.io-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; }
footer { border-top: 1px solid var(--line); background: var(--deep); color: #f4ece1; }
.footer-inner { padding: 32px 0; display: flex; justify-content: space-between; gap: 16px; font-size: 13px; }
@media (max-width: 1024px) {
  .nav { border-radius: 24px; flex-wrap: wrap; }
  .nav-toggle { display: inline-flex !important; }
  .nav-links { display: none; width: 100%; flex-direction: column; align-items: flex-start; padding: 8px 10px 14px; }
  .nav-links.open { display: flex; }
  .section-head, .grid-3, .step, .step.reverse, .io-grid, .bench-grid { grid-template-columns: 1fr; direction: ltr; }
  .footer-inner { flex-direction: column; }
  h1 { font-size: 42px; }
  figure img { height: 220px; }
  .wrap { width: min(1120px, calc(100% - 32px)); padding: 56px 0; }
}