:root {
  --wood: #6b4a2a;
  --bead: #1a1a1a;
  --coin: #3a7a6a;
  --amber: #c4a056;
  --paper: #f3ead8;
  --ink: #1c140c;
  --mute: #6a5844;
  --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: 64px; }
body { margin: 0; color: var(--ink); background: var(--paper); font-family: var(--sans); line-height: 1.7; }
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
.app-link { color: var(--wood); text-decoration: underline; text-underline-offset: 3px; }
button { font-family: inherit; cursor: pointer; }
code { font-family: var(--mono); }
.ledger {
  pointer-events: none;
  position: fixed;
  inset: 0;
  z-index: 6;
  opacity: 0.16;
  background-image: url("images/texture.webp");
  background-size: 380px auto;
  mix-blend-mode: multiply;
}
.skip { position: absolute; left: -999px; }
.skip:focus { left: 10px; top: 10px; z-index: 80; background: var(--amber); padding: 8px; }
.suanbar {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  padding: 10px 20px;
  background: var(--wood);
  color: var(--paper);
}
.brand { font-family: var(--serif); }
.brand small { display: block; font-family: var(--mono); font-size: 10px; color: var(--amber); letter-spacing: 0.12em; }
.nav-toggle { display: none; background: var(--amber); color: #1c140c; border: 0; padding: 8px 12px; }
.suan-nav { display: flex; gap: 14px; align-items: center; font-size: 13px; }
.suan-nav a { color: #e8dcc8; }
.suan-nav a.is-active, .suan-nav a:hover { color: var(--amber); }
.suan-nav a.live { background: var(--coin); color: #fff; padding: 7px 12px; }
.desk { display: grid; grid-template-columns: 1fr 1fr; }
.desk figure { margin: 0; }
.desk img { width: 100%; height: 100%; object-fit: cover; min-height: 440px; }
.bank { padding: 40px 32px; border-right: 8px solid var(--wood); }
.kicker { font-family: var(--mono); letter-spacing: 0.14em; font-size: 11px; color: var(--wood); margin: 0 0 10px; }
h1, h2, h3 { margin: 0 0 12px; line-height: 1.18; font-family: var(--serif); }
h1 { font-size: clamp(28px, 3.8vw, 42px); }
.bead-demo { margin: 16px 0; padding: 14px; background: #fff; }
.rails { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 6px; }
.rails button { border: 0; background: var(--bead); color: #fff; padding: 12px 8px; border-radius: 999px; }
.rails button.on { background: var(--amber); color: #1c140c; }
.cta { display: flex; flex-wrap: wrap; gap: 10px; }
.btn { display: inline-flex; padding: 10px 14px; border: 1px solid currentColor; }
.btn.fill { background: var(--wood); color: var(--paper); border-color: var(--wood); }
.w { width: min(1040px, calc(100% - 40px)); margin: 0 auto; padding: 72px 0; }
.wood { background: #e8dcc8; }
.tri { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; margin-top: 20px; }
.tri article, .io > div { background: #fff; padding: 16px; }
.tri ul, .io ul { margin: 0; padding-left: 1.1em; }
.quiet { color: var(--mute); max-width: 46em; }
figure { margin: 24px 0 0; }
figure img { width: 100%; max-height: 280px; object-fit: cover; }
figcaption { font-size: 13px; color: var(--mute); margin-top: 8px; }
.io { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
footer { padding: 18px 22px 36px; font-family: var(--mono); font-size: 12px; color: var(--mute); }
@media (max-width: 900px) {
  .desk, .tri, .io, .rails { grid-template-columns: 1fr; }
  .bank { border-right: 0; border-bottom: 8px solid var(--wood); }
  .nav-toggle { display: inline-block; }
  .suanbar { position: relative; }
  .suan-nav { display: none; position: absolute; right: 10px; top: 56px; flex-direction: column; background: var(--wood); padding: 10px; border: 1px solid var(--amber); }
  .suan-nav.open { display: flex; }
}