:root {
  --ink: #1c1714;
  --mute: #6d645c;
  --yeast: #f3ead6;
  --yeast-2: #fff8ea;
  --grape: #4a2744;
  --grape-2: #6e3b5c;
  --patina: #7a9e86;
  --cellar: #14110f;
  --line: rgba(122, 158, 134, 0.35);
  --serif: "Noto Serif SC", "Songti SC", serif;
  --sans: "Noto Sans SC", "PingFang SC", sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, monospace;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
section[id] { scroll-margin-top: 92px; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--yeast);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.72;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
.app-link, .live { color: var(--grape-2); border-bottom: 1px solid rgba(110, 59, 92, 0.4); }
footer .app-link { color: var(--patina); }
button { font-family: inherit; cursor: pointer; }
code { font-family: var(--mono); font-size: 0.9em; background: rgba(122, 158, 134, 0.18); padding: 0.05em 0.35em; }

.patina {
  pointer-events: none; position: fixed; inset: 0; z-index: 50; opacity: 0.12;
  background-image: url("images/texture.webp"); background-size: 460px auto; mix-blend-mode: multiply;
}
.pipe {
  position: fixed; left: 18px; top: 0; bottom: 0; width: 8px; z-index: 20;
  background: linear-gradient(180deg, var(--grape) 0%, var(--patina) 55%, #c4a574 100%);
  border-radius: 8px;
}
.skip { position: absolute; left: -999px; }
.skip:focus { left: 16px; top: 12px; z-index: 80; background: var(--yeast-2); padding: 8px 12px; }

.nav {
  position: fixed; top: 10px; left: 40px; right: 16px; z-index: 40;
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  padding: 8px 14px; background: rgba(243, 234, 214, 0.9); backdrop-filter: blur(14px);
  border: 1px solid var(--line);
}
.brand { display: flex; align-items: center; gap: 10px; font-family: var(--serif); font-weight: 700; }
.brand small { display: block; font-family: var(--mono); font-weight: 400; font-size: 10px; letter-spacing: 0.16em; color: var(--mute); }
.drop {
  width: 22px; height: 28px; background: var(--grape);
  border-radius: 50% 50% 50% 50% / 40% 40% 60% 60%;
  box-shadow: 0 0 0 3px var(--patina);
}
.nav-toggle { display: none; background: transparent; border: 1px solid var(--grape); color: var(--grape); padding: 6px 12px; }
.nav-links { display: flex; gap: 14px; align-items: center; font-size: 13px; }
.nav-links a { color: var(--mute); }
.nav-links a.is-active, .nav-links a:hover { color: var(--grape); }
.nav-links .live { padding: 5px 10px; border: 1px solid var(--grape); }

.hero { position: relative; min-height: 100vh; display: grid; align-items: end; overflow: hidden; color: var(--yeast-2); margin-left: 34px; }
.hero picture { position: absolute; inset: 0; }
.hero img { width: 100%; height: 100%; object-fit: cover; }
.hero::after {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(180deg, rgba(20, 17, 15, 0.15) 0%, rgba(20, 17, 15, 0.55) 50%, rgba(20, 17, 15, 0.92) 100%);
}
.hero-copy { position: relative; z-index: 1; padding: 20vh 8vw 10vh; max-width: 760px; }
.kicker, .vlabel { font-family: var(--mono); letter-spacing: 0.22em; font-size: 11px; color: var(--patina); margin: 0 0 12px; }
.vlabel { color: var(--grape); }
h1, h2, h3 { font-family: var(--serif); margin: 0 0 14px; line-height: 1.08; word-break: keep-all; }
h1 { font-size: clamp(42px, 7vw, 96px); }
h2 { font-size: clamp(26px, 3.5vw, 42px); }
h3 { font-size: 22px; }
.lead { max-width: 38em; word-break: keep-all; overflow-wrap: anywhere; color: rgba(255, 248, 234, 0.9); }
.hero-id { font-family: var(--mono); font-size: 12px; color: var(--patina); border-left: 3px solid var(--patina); padding-left: 12px; }
.meta-row { display: flex; flex-wrap: wrap; gap: 8px; margin: 20px 0; }
.chip { border: 1px solid rgba(243, 234, 214, 0.35); padding: 3px 10px; font-size: 12px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 10px; }
.btn { display: inline-flex; align-items: center; justify-content: center; min-height: 44px; padding: 10px 16px; border: 1px solid currentColor; font-size: 14px; }
.btn-fill { background: var(--patina); color: var(--cellar); border-color: var(--patina); }
.btn-ghost { background: transparent; color: inherit; }

.wrap { width: min(1100px, calc(100% - 72px)); margin: 0 auto; padding: 88px 0; }
#need, #bench, #rules { margin-left: 34px; }
.alt { margin-left: 34px; background: linear-gradient(180deg, #e7dcc8 0%, var(--yeast) 100%); }
.section-head { display: grid; grid-template-columns: 140px 1fr; gap: 20px; margin-bottom: 36px; }
.section-head p:last-child { color: var(--mute); margin: 0; }
.tri, .bench-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.card { background: var(--yeast-2); border: 1px solid var(--line); padding: 20px; min-height: 210px; border-radius: 0 28px 0 28px; }
.card.warn { outline: 1px solid var(--grape-2); }
.stamp { display: inline-block; font-family: var(--mono); font-size: 10px; letter-spacing: 0.14em; color: var(--grape); border: 1px solid var(--grape); padding: 2px 8px; margin-bottom: 8px; }
.card ul, .io ul, .rule-list { margin: 0; padding-left: 1.1em; }
.card li, .io li, .rule-list li { margin: 0.35em 0; }

.node { display: grid; grid-template-columns: 1fr 1fr; gap: 36px; align-items: center; margin-bottom: 64px; }
.node.flip { direction: rtl; }
.node.flip > * { direction: ltr; }
.num { font-family: var(--mono); color: var(--patina); display: block; margin-bottom: 6px; letter-spacing: 0.12em; }
figure { margin: 0; }
figure img { width: 100%; height: 320px; object-fit: cover; border-radius: 0 40px 0 40px; }
figcaption { margin-top: 8px; font-size: 13px; color: var(--mute); }
.demo { margin-top: 16px; padding: 14px; border: 1px dashed var(--patina); }
.demo-kicker { margin: 0 0 8px; font-family: var(--mono); font-size: 11px; color: var(--grape); }
.brix { height: 10px; background: rgba(74, 39, 68, 0.15); }
.brix i { display: block; height: 100%; width: 70%; background: var(--grape); }

.io { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.io > div { background: var(--yeast-2); padding: 20px; border-left: 6px solid var(--patina); }

footer { margin-left: 34px; background: var(--cellar); color: var(--yeast); }
.footer-inner { display: flex; justify-content: space-between; gap: 12px; padding: 32px 0; font-size: 13px; }

@media (max-width: 960px) {
  .pipe { display: none; }
  .nav, .hero, .alt, #need, #bench, #rules, footer { margin-left: 0; }
  .nav { left: 8px; right: 8px; }
  .hero, .node, .section-head, .tri, .bench-grid, .io, .footer-inner { grid-template-columns: 1fr; }
  .hero { min-height: 100svh; }
  .hero-copy { padding: 120px 20px 48px; }
  .wrap { width: min(1100px, calc(100% - 32px)); }
  .nav-toggle { display: inline-flex; }
  .nav-links {
    display: none; position: absolute; top: 100%; left: 0; right: 0;
    flex-direction: column; align-items: stretch; padding: 12px 16px 18px;
    background: var(--yeast-2); border: 1px solid var(--line);
  }
  .nav-links.open { display: flex; }
  figure img { height: 220px; }
}