:root {
  --liner: #f4f1ea;
  --ink: #1c1a17;
  --mute: #6b645c;
  --uv: #6b4cff;
  --uv-2: #b9a8ff;
  --c1: #e23b3b;
  --c2: #2f7d5b;
  --c3: #2a6adf;
  --line: rgba(28, 26, 23, 0.12);
  --sans: "Noto Sans SC", "PingFang SC", sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, Menlo, monospace;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
section[id] { scroll-margin-top: 82px; }

body {
  margin: 0;
  color: var(--ink);
  background: var(--liner);
  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 { color: var(--uv); text-decoration: underline; text-underline-offset: 3px; }
button { font-family: inherit; cursor: pointer; }
code { font-family: var(--mono); background: rgba(107,76,255,0.1); padding: 0.05em 0.4em; }

.liner {
  pointer-events: none;
  position: fixed;
  inset: 0;
  z-index: 4;
  opacity: 0.18;
  background-image: url("images/texture.webp");
  background-size: 380px auto;
  mix-blend-mode: multiply;
}

.web-edge {
  pointer-events: none;
  position: fixed;
  left: 0; right: 0; top: 72px;
  height: 6px;
  z-index: 8;
  background: repeating-linear-gradient(90deg, var(--c1) 0 24px, var(--c3) 24px 48px, var(--c2) 48px 72px, var(--uv) 72px 96px);
}

.skip { position: absolute; left: -999px; }
.skip:focus { left: 12px; top: 12px; z-index: 70; background: #fff; padding: 8px 12px; }

.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 28px 10px;
  background: rgba(244, 241, 234, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}

.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; }
.brand small { display: block; font-family: var(--mono); font-weight: 400; font-size: 10px; letter-spacing: 0.16em; color: var(--mute); }
.seal {
  width: 28px; height: 28px;
  display: grid; place-items: center;
  border: 2px solid var(--uv);
  color: var(--uv);
  font-family: var(--mono);
}

.nav-toggle { display: none; background: transparent; border: 1px solid var(--ink); padding: 6px 12px; }
.nav-links { display: flex; gap: 14px; font-size: 13px; }
.nav-links a { color: var(--mute); border-bottom: 2px solid transparent; }
.nav-links a.is-active, .nav-links a:hover { color: var(--ink); border-bottom-color: var(--uv); }
.nav-links a.live { color: #fff; background: var(--uv); border: 0; padding: 6px 12px; }

.hero {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  min-height: calc(100vh - 76px);
}
.hero figure { margin: 0; }
.hero img { width: 100%; height: 100%; object-fit: cover; min-height: 520px; }
.hero-copy { padding: 8vh 5vw; display: flex; flex-direction: column; justify-content: center; }

.kicker, .vlabel { font-family: var(--mono); letter-spacing: 0.18em; font-size: 11px; color: var(--uv); margin: 0 0 12px; }
h1, h2, h3 { font-weight: 700; line-height: 1.08; margin: 0 0 14px; letter-spacing: -0.03em; }
h1 { font-size: clamp(36px, 5.6vw, 68px); }
h2 { font-size: clamp(24px, 3.2vw, 36px); }
h3 { font-size: 20px; }
.lead { color: #3a352f; }

.meta-row { display: flex; flex-wrap: wrap; gap: 8px; margin: 18px 0; }
.chip { padding: 4px 10px; font-size: 12px; font-family: var(--mono); color: #fff; }
.chip.c1 { background: var(--c1); }
.chip.c2 { background: var(--c2); }
.chip.c3 { background: var(--c3); }
.chip.c4 { background: #111; }
.chip.c5 { background: var(--uv); }
.chip.c6 { background: #8a6a2a; }

.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; }
.btn-fill { background: var(--uv); color: #fff; border-color: var(--uv); }
.btn-ghost { background: #fff; }

.tape { margin-top: 22px; padding: 14px; background: #fff; border: 1px solid var(--line); }
.tape-track { height: 10px; background: #ddd6c8; margin-bottom: 10px; position: relative; }
.tape-track i { position: absolute; left: 0; top: 0; bottom: 0; width: 55%; background: var(--uv); }
.lock-ok { color: var(--c2); font-weight: 600; }
.lock-warn { color: var(--c1); font-weight: 600; }

.wrap { width: min(1100px, calc(100% - 48px)); margin: 0 auto; padding: 80px 0; }
.section-head { display: grid; grid-template-columns: 148px 1fr; gap: 20px; margin-bottom: 32px; }
.section-head p:last-child { color: var(--mute); margin: 0; }

.spot-row, .bench-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.spot, .bench, .io-grid > div { background: #fff; border: 1px solid var(--line); padding: 20px; }
.stamp { font-family: var(--mono); font-size: 11px; color: var(--uv); letter-spacing: 0.12em; }
.alt { background: #ece7dc; }

.web { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; align-items: center; margin-bottom: 40px; }
.web.flip { direction: rtl; }
.web.flip > * { direction: ltr; }
.web figure { margin: 0; border: 1px solid var(--line); background: #fff; }
.web img { width: 100%; height: 230px; object-fit: cover; }
.web figcaption { padding: 10px 14px; font-size: 13px; color: var(--mute); }
.num { font-family: var(--mono); color: var(--uv); font-size: 12px; }

.rule-list { margin: 0; padding-left: 22px; }
.rule-list li { margin-bottom: 10px; }
.io-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
footer { border-top: 1px solid var(--line); background: #fff; }
.footer-inner { display: flex; justify-content: space-between; gap: 16px; padding: 28px 0 48px; color: var(--mute); font-size: 14px; }

@media (max-width: 900px) {
  .web-edge { display: none; }
  .nav { padding: 12px 16px; flex-wrap: wrap; }
  .nav-toggle { display: inline-flex; margin-left: auto; background: #fff; position: relative; z-index: 60; }
  .nav-links { display: none; flex-direction: column; width: 100%; padding: 8px 0 12px; }
  .nav-links.open { display: flex; }
  .hero, .web, .web.flip, .section-head, .spot-row, .bench-grid, .io-grid, .footer-inner {
    grid-template-columns: 1fr; direction: ltr;
  }
  .hero img { min-height: 240px; }
  .hero-copy { padding: 32px 20px 48px; }
  .wrap { width: min(1100px, calc(100% - 28px)); padding: 52px 0; }
}