:root {
  --tar: #111114;
  --steel: #1a1c22;
  --rail: #c8c4bc;
  --noise: #e07a2a;
  --insul: #7a4aa8;
  --paper: #ece8e0;
  --ink: #ece8e0;
  --mute: #9a9488;
  --display: "Exo 2", "Noto Sans SC", sans-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: 70px; }
body { margin: 0; background: var(--tar); color: var(--ink); 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(--noise); text-decoration: underline; text-underline-offset: 3px; }
button { font-family: inherit; cursor: pointer; }
.tar {
  pointer-events: none; position: fixed; inset: 0; z-index: 6; opacity: 0.14;
  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(--noise); color: #111; padding: 8px; }
.rail-bar {
  position: sticky; top: 0; z-index: 40;
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  padding: 10px 24px; background: rgba(17,17,20,0.94);
  border-bottom: 3px solid var(--rail);
}
.brand { font-family: var(--display); font-weight: 800; letter-spacing: 0.04em; }
.brand small { display: block; font-family: var(--mono); font-size: 10px; letter-spacing: 0.14em; color: var(--mute); font-weight: 500; }
.nav-toggle { display: none; background: var(--noise); border: 0; color: #111; padding: 6px 12px; font-weight: 700; }
.km-links { display: flex; gap: 14px; font-size: 14px; flex-wrap: wrap; }
.km-links a { color: var(--mute); }
.km-links a.is-active, .km-links a:hover { color: var(--noise); }
.km-links .live { background: var(--noise); color: #111; padding: 6px 12px; font-weight: 700; }
.hero { display: grid; grid-template-columns: 1.15fr 0.95fr; min-height: 86vh; }
.hero figure { margin: 0; }
.hero img { width: 100%; height: 100%; object-fit: cover; min-height: 440px; }
.sheet { padding: 44px 32px; background: linear-gradient(180deg, #16181e, #121318); }
.kicker { font-family: var(--mono); letter-spacing: 0.16em; font-size: 11px; color: var(--noise); margin: 0 0 10px; }
h1, h2, h3 { font-family: var(--display); margin: 0 0 12px; line-height: 1.05; font-weight: 800; }
h1 { font-size: clamp(36px, 5.6vw, 68px); }
h2 { font-size: clamp(24px, 3.2vw, 38px); }
.lead { color: var(--mute); }
.seg { margin: 20px 0; padding: 16px 18px; background: #0e1014; border-top: 6px solid var(--noise); }
.seg button { margin-top: 8px; background: var(--noise); color: #111; border: 0; padding: 8px 14px; font-weight: 700; }
.cta { display: flex; flex-wrap: wrap; gap: 10px; }
.btn { display: inline-flex; align-items: center; padding: 10px 16px; border: 1px solid currentColor; font-size: 14px; }
.btn.fill { background: var(--noise); color: #111; border-color: var(--noise); font-weight: 700; }
.btn.line { color: var(--ink); }
.w { width: min(1080px, calc(100% - 40px)); margin: 0 auto; padding: 76px 0; }
#need, #wave, #rules { background: var(--paper); color: #161410; }
#need .kicker, #wave .kicker, #rules .kicker { color: #8a4a18; }
#need .app-link, #wave .app-link, #rules .app-link { color: #8a4a18; }
.steel { background: var(--steel); }
.tri { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 12px; margin-top: 20px; }
.tri article { background: rgba(255,255,255,0.04); padding: 16px; }
#need .tri article { background: #fff; }
.tri ul, .io ul, #rules ol { margin: 0; padding-left: 1.1em; }
.steps { padding-left: 1.2em; max-width: 50em; }
.steps li { margin-bottom: 10px; }
.wide { margin: 28px 0 0; }
.wide img { width: 100%; height: 280px; object-fit: cover; }
.wide figcaption { font-size: 13px; color: var(--mute); margin-top: 8px; }
#rules ol { background: #fff; padding: 16px 16px 16px 36px; border-left: 8px solid var(--insul); max-width: 46em; }
.io { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.io > div { background: #0e1014; padding: 16px; }
.url { margin-top: 18px; font-family: var(--mono); font-size: 13px; }
footer { padding: 20px 24px 40px; color: var(--mute); font-size: 13px; }
@media (max-width: 900px) {
  .nav-toggle { display: inline-block; }
  .rail-bar { flex-wrap: wrap; }
  .km-links { display: none; width: 100%; flex-direction: column; background: #0e1014; padding: 12px; }
  .km-links.open { display: flex; }
  .hero, .tri, .io { grid-template-columns: 1fr; }
  h1 { font-size: 34px; }
}