:root {
  --ink: #0c0b09;
  --panel: #161310;
  --gold: #c9a46c;
  --gold-2: #e2c48a;
  --paper: #f0e6d4;
  --mute: #9a8f7c;
  --crane: #c45a4a;
  --celeste: #5b8fa8;
  --ok: #6a8f6b;
  --line: rgba(201, 164, 108, 0.22);
  --serif: "Noto Serif SC", "Songti SC", serif;
  --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: 84px; }

body {
  margin: 0;
  color: var(--paper);
  background: var(--ink);
  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 { color: var(--gold-2); text-decoration: underline; text-underline-offset: 3px; }
button { font-family: inherit; cursor: pointer; }
code { font-family: var(--mono); font-size: 0.88em; background: rgba(201,164,108,0.12); padding: 0.05em 0.4em; }

.warp-field {
  pointer-events: none;
  position: fixed;
  inset: 0;
  z-index: 4;
  opacity: 0.16;
  background-image:
    url("images/texture.webp"),
    repeating-linear-gradient(90deg, transparent 0 11px, rgba(201,164,108,0.35) 11px 12px);
  background-size: 280px auto, auto;
  mix-blend-mode: overlay;
}

.skip { position: absolute; left: -999px; }
.skip:focus { left: 12px; top: 12px; z-index: 70; background: var(--panel); padding: 8px 12px; }

.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 12px 28px;
  background: rgba(12, 11, 9, 0.86);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--serif);
  font-weight: 700;
  color: var(--gold);
}

.brand small {
  display: block;
  font-family: var(--mono);
  font-weight: 400;
  font-size: 10px;
  letter-spacing: 0.18em;
  color: var(--mute);
}

.seal {
  width: 40px;
  height: 28px;
  display: grid;
  place-items: center;
  border: 1px solid var(--gold);
  border-radius: 40% / 50%;
  font-size: 14px;
}

.nav-toggle {
  display: none;
  background: transparent;
  border: 1px solid var(--gold);
  color: var(--gold);
  padding: 6px 12px;
}

.nav-links { display: flex; gap: 16px; font-size: 13px; }
.nav-links a { color: var(--mute); border-bottom: 1px solid transparent; padding-bottom: 2px; }
.nav-links a.is-active,
.nav-links a:hover { color: var(--gold-2); border-bottom-color: var(--gold); }
.nav-links a.live {
  color: var(--ink);
  background: var(--gold);
  border: 0;
  padding: 6px 12px;
}

.hero {
  position: relative;
  min-height: 92vh;
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  align-items: stretch;
}

.hero img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  min-height: 560px;
}

.hero-panel {
  padding: 8vh 5vw;
  display: flex;
  flex-direction: column;
  justify-content: center;
  background: linear-gradient(180deg, #14110d, #0c0b09);
  border-left: 1px solid var(--line);
}

.kicker, .vlabel {
  font-family: var(--mono);
  letter-spacing: 0.22em;
  font-size: 11px;
  color: var(--gold);
  margin: 0 0 12px;
}

h1, h2, h3 {
  font-family: var(--serif);
  font-weight: 700;
  line-height: 1.12;
  margin: 0 0 16px;
}

h1 { font-size: clamp(36px, 5.4vw, 68px); color: var(--gold-2); }
h2 { font-size: clamp(24px, 3.2vw, 38px); }
h3 { font-size: 20px; }

.lead { font-size: 16px; color: rgba(240,230,212,0.86); }
.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);
  color: var(--gold);
}

.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(--gold); color: var(--ink); border-color: var(--gold); }
.btn-ghost { background: transparent; color: inherit; }

.wrap { width: min(1100px, calc(100% - 48px)); margin: 0 auto; padding: 84px 0; }
.section-head { display: grid; grid-template-columns: 148px 1fr; gap: 22px; margin-bottom: 36px; }
.section-head p:last-child { color: var(--mute); margin: 0; }

.weft-row, .bench-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.weft, .bench, .io-grid > div {
  background: var(--panel);
  border: 1px solid var(--line);
  padding: 20px;
  background-image: repeating-linear-gradient(90deg, transparent 0 18px, rgba(201,164,108,0.06) 18px 19px);
}
.stamp { display: inline-block; font-family: var(--mono); font-size: 11px; letter-spacing: 0.14em; color: var(--celeste); margin-bottom: 8px; }
.alt { background: #100e0c; }

.path {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 26px;
  align-items: center;
  margin-bottom: 44px;
}
.path.flip { direction: rtl; }
.path.flip > * { direction: ltr; }
.path figure { margin: 0; border: 1px solid var(--line); }
.path img { width: 100%; height: 250px; object-fit: cover; }
.path figcaption { padding: 10px 14px; font-size: 13px; color: var(--mute); }
.num { font-family: var(--mono); color: var(--gold); font-size: 12px; letter-spacing: 0.12em; }

.slit {
  margin-top: 16px;
  padding: 14px;
  border: 1px dashed var(--gold);
}
.lock-ok { color: var(--ok); font-weight: 600; }
.lock-warn { color: var(--crane); font-weight: 600; }

.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); }
.footer-inner { display: flex; justify-content: space-between; gap: 16px; padding: 28px 0 48px; color: var(--mute); font-size: 14px; }

@media (max-width: 900px) {
  .nav { padding: 12px 16px; flex-wrap: wrap; }
  .nav-toggle {
    display: inline-flex;
    margin-left: auto;
    background: var(--panel);
    position: relative;
    z-index: 60;
  }
  .nav-links { display: none; flex-direction: column; width: 100%; padding: 8px 0 12px; }
  .nav-links.open { display: flex; }
  .hero, .path, .path.flip, .section-head, .weft-row, .bench-grid, .io-grid, .footer-inner {
    grid-template-columns: 1fr;
    direction: ltr;
  }
  .hero { min-height: auto; }
  .hero img { min-height: 280px; }
  .hero-panel { padding: 36px 20px 48px; border-left: 0; border-top: 1px solid var(--line); }
  .wrap { width: min(1100px, calc(100% - 28px)); padding: 52px 0; }
}