:root {
  --ink: #ece7d8;
  --mute: #9a927f;
  --void: #10110f;
  --void-2: #1a1c18;
  --wood: #6b4423;
  --zinc: #8b9288;
  --hi: #e8ff47;
  --copper: #c46a2b;
  --line: rgba(232, 255, 71, 0.18);
  --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: 96px; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--void);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.7;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
.app-link, .live { color: var(--hi); border-bottom: 1px solid rgba(232, 255, 71, 0.4); }
button { font-family: inherit; cursor: pointer; }
code { font-family: var(--mono); font-size: 0.9em; background: rgba(232, 255, 71, 0.12); padding: 0.05em 0.35em; color: var(--hi); }

.sheath {
  pointer-events: none;
  position: fixed;
  inset: 0;
  z-index: 50;
  opacity: 0.16;
  background-image: url("images/texture.webp");
  background-size: 420px auto;
  mix-blend-mode: overlay;
}
.skip { position: absolute; left: -999px; }
.skip:focus { left: 12px; top: 12px; z-index: 80; background: var(--hi); color: var(--void); padding: 8px 12px; }

.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 40;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 22px;
  background: rgba(16, 17, 15, 0.88);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(12px);
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; letter-spacing: 0.08em; }
.brand small { display: block; font-family: var(--mono); font-weight: 400; font-size: 10px; color: var(--mute); letter-spacing: 0.16em; }
.hub {
  width: 28px;
  height: 28px;
  border: 3px solid var(--hi);
  border-radius: 50%;
  box-shadow: inset 0 0 0 6px var(--void), inset 0 0 0 9px var(--hi);
}
.nav-toggle { display: none; background: transparent; border: 1px solid var(--hi); color: var(--hi); 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(--hi); }
.nav-links .live { padding: 5px 10px; border: 1px solid var(--hi); }

.hero {
  position: relative;
  min-height: 100vh;
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  align-items: end;
  overflow: hidden;
}
.hero picture { position: absolute; inset: 0; }
.hero picture img, .hero img { width: 100%; height: 100%; object-fit: cover; }
.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 80% 70%, rgba(232, 255, 71, 0.12), transparent 40%),
    linear-gradient(180deg, rgba(16, 17, 15, 0.2) 0%, rgba(16, 17, 15, 0.75) 70%, var(--void) 100%);
}
.hero-copy { position: relative; z-index: 1; padding: 18vh 6vw 10vh; max-width: 720px; }
.kicker, .vlabel { font-family: var(--mono); letter-spacing: 0.22em; font-size: 11px; color: var(--hi); margin: 0 0 12px; }
.vlabel { color: var(--hi); }
h1, h2, h3 { margin: 0 0 14px; line-height: 1.05; font-weight: 700; word-break: keep-all; }
h1 { font-size: clamp(42px, 7.2vw, 92px); letter-spacing: -0.03em; }
h2 { font-size: clamp(26px, 3.4vw, 40px); }
h3 { font-size: 20px; }
.lead { max-width: 38em; color: rgba(236, 231, 216, 0.88); word-break: keep-all; overflow-wrap: anywhere; }
.hero-id { font-family: var(--mono); font-size: 12px; color: var(--hi); border-left: 3px solid var(--hi); padding-left: 12px; }
.meta-row { display: flex; flex-wrap: wrap; gap: 8px; margin: 20px 0; }
.chip { border: 1px solid var(--line); padding: 3px 10px; font-size: 12px; font-family: var(--mono); }
.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(--hi); color: var(--void); border-color: var(--hi); }
.btn-ghost { background: transparent; color: inherit; }

.spool {
  position: relative;
  z-index: 1;
  justify-self: center;
  align-self: center;
  text-align: center;
  padding: 0 6vw 12vh 0;
}
.spool-svg { width: 220px; height: 220px; transform: rotate(-90deg); }
.spool-svg .track { fill: none; stroke: rgba(232, 255, 71, 0.18); stroke-width: 10; }
.spool-svg .arc {
  fill: none; stroke: var(--hi); stroke-width: 10;
  stroke-dasharray: 301; stroke-dashoffset: 120; stroke-linecap: butt;
}
.spool-svg .core { fill: var(--wood); stroke: var(--hi); stroke-width: 2; }
#spool-id { font-family: var(--mono); margin: 8px 0 0; }
#spool-meta { margin: 4px 0 0; font-size: 12px; color: var(--mute); }

.wrap { width: min(1120px, calc(100% - 40px)); margin: 0 auto; padding: 88px 0; }
.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; }
.tile {
  background: var(--void-2);
  border: 1px solid var(--line);
  padding: 20px;
  min-height: 210px;
}
.tile.warn { border-color: var(--copper); }
.stamp {
  display: inline-block; font-family: var(--mono); font-size: 10px; letter-spacing: 0.16em;
  color: var(--hi); border: 1px solid var(--hi); padding: 2px 8px; margin-bottom: 10px;
}
.tile ul, .io ul, .rule-list { margin: 0; padding-left: 1.1em; }
.tile li, .io li, .rule-list li { margin: 0.35em 0; }
.alt { background: #161814; }

.beat {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 36px;
  align-items: center;
  margin-bottom: 64px;
  padding-left: 16px;
  border-left: 4px solid var(--hi);
}
.beat.reverse { direction: rtl; }
.beat.reverse > * { direction: ltr; }
.num { font-family: var(--mono); color: var(--hi); display: block; margin-bottom: 6px; }
figure { margin: 0; }
figure img { width: 100%; height: 320px; object-fit: cover; filter: saturate(0.9) contrast(1.05); }
figcaption { margin-top: 8px; font-size: 13px; color: var(--mute); }

.demo { margin-top: 18px; padding: 14px; border: 1px dashed var(--hi); }
.demo-kicker { margin: 0 0 8px; font-family: var(--mono); font-size: 11px; color: var(--hi); }

.io { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.io > div { background: var(--void-2); padding: 20px; border-top: 4px solid var(--hi); }

footer { background: #0b0c0a; border-top: 1px solid var(--line); }
.footer-inner { display: flex; justify-content: space-between; gap: 12px; padding: 32px 0; font-size: 13px; color: var(--mute); }

@media (max-width: 960px) {
  .hero, .beat, .section-head, .tri, .bench-grid, .io, .footer-inner { grid-template-columns: 1fr; }
  .hero { min-height: 100svh; }
  .hero-copy { padding: 110px 20px 32px; }
  .spool { padding: 0 20px 48px; }
  .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(--void-2); border-bottom: 1px solid var(--line);
  }
  .nav-links.open { display: flex; }
  figure img { height: 220px; }
}