:root {
  --night: #0c141c;
  --night-2: #152028;
  --foam: #e8eef2;
  --amber: #e8b24a;
  --signal: #c43c32;
  --mute: #8a9aa8;
  --display: "Barlow", "Noto Sans SC", sans-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: 72px; }
body {
  margin: 0;
  color: var(--foam);
  background: var(--night);
  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(--amber); text-decoration: underline; text-underline-offset: 3px; }
button { font-family: inherit; cursor: pointer; }
label { display: block; font-size: 13px; color: var(--mute); }
input[type="range"] { width: min(280px, 100%); accent-color: var(--amber); }
.tick {
  pointer-events: none;
  position: fixed;
  inset: 0;
  z-index: 6;
  opacity: 0.12;
  background-image: url("images/texture.webp");
  background-size: 320px auto;
  mix-blend-mode: overlay;
}
.skip { position: absolute; left: -999px; }
.skip:focus { left: 12px; top: 12px; z-index: 80; background: var(--amber); color: #111; padding: 8px; }
.bar {
  position: sticky;
  top: 0;
  z-index: 40;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 22px;
  background: rgba(12, 20, 28, 0.94);
  border-bottom: 1px solid rgba(232, 178, 74, 0.35);
}
.brand { font-family: var(--display); font-weight: 700; letter-spacing: 0.1em; text-transform: uppercase; }
.brand small {
  display: block;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  color: var(--mute);
  font-weight: 400;
  text-transform: none;
}
.nav-toggle {
  display: none;
  background: var(--amber);
  color: #111;
  border: 0;
  padding: 6px 12px;
}
.nav-links { display: flex; gap: 14px; font-size: 14px; flex-wrap: wrap; }
.nav-links a { color: var(--mute); }
.nav-links a.is-active, .nav-links a:hover { color: var(--amber); }
.nav-links .live { background: var(--amber); color: #111; padding: 6px 12px; }
.hero {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 24px;
  align-items: center;
  padding: 28px 28px 48px;
  min-height: calc(100vh - 58px);
}
.port {
  margin: 0 auto;
  width: min(100%, 520px);
  aspect-ratio: 1;
  border-radius: 50%;
  overflow: hidden;
  border: 14px solid #24303a;
  box-shadow: 0 0 0 1px rgba(232, 178, 74, 0.25), 0 20px 50px rgba(0, 0, 0, 0.45);
}
.port img { width: 100%; height: 100%; object-fit: cover; }
.kicker {
  font-family: var(--mono);
  letter-spacing: 0.16em;
  font-size: 11px;
  color: var(--amber);
  margin: 0 0 12px;
}
h1, h2, h3 { font-family: var(--display); margin: 0 0 12px; line-height: 1.05; font-weight: 700; letter-spacing: 0.02em; }
h1 { font-size: clamp(34px, 5.4vw, 62px); text-transform: uppercase; }
h2 { font-size: clamp(24px, 3vw, 36px); }
.lead { max-width: 42em; color: var(--mute); }
.wavebox {
  margin: 18px 0;
  padding: 14px 16px;
  background: var(--night-2);
  border-left: 6px solid var(--signal);
  max-width: 32em;
}
.wavebox.is-ok { border-left-color: var(--amber); }
.swell { width: 100%; height: 56px; display: block; margin-bottom: 8px; }
.swell path { fill: rgba(232, 178, 74, 0.35); stroke: var(--amber); stroke-width: 2; }
.n { font-family: var(--display); font-size: 32px; margin: 0 0 6px; }
.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; font-family: var(--display); letter-spacing: 0.08em; }
.btn.foam { background: var(--amber); color: #111; border-color: var(--amber); }
.btn.line { color: var(--foam); }
.w { width: min(1040px, calc(100% - 40px)); margin: 0 auto; padding: 72px 0; }
#need, #wave, #rules { background: #e8eef2; color: #0c141c; }
#need .kicker, #wave .kicker, #rules .kicker { color: #8a5a10; }
#need .app-link, #wave .app-link, #rules .app-link { color: #8a5a10; }
.alt { background: var(--night-2); }
.tri { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 12px; margin-top: 20px; }
.tri article { background: #fff; color: #0c141c; padding: 16px; }
.alt .tri article { background: #0c141c; color: var(--foam); }
.tri ul, .io ul, #rules ol { margin: 0; padding-left: 1.1em; }
.steps { padding-left: 1.2em; max-width: 48em; }
.steps li { margin-bottom: 10px; }
.pair { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 24px; }
.pair img { width: 100%; height: 240px; object-fit: cover; }
.pair figcaption { font-size: 13px; color: var(--mute); margin-top: 8px; }
#rules ol {
  background: #fff;
  padding: 16px 16px 16px 36px;
  border-left: 8px solid var(--signal);
  max-width: 46em;
}
.io { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.io > div { background: #0c141c; 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) {
  .hero, .tri, .pair, .io { grid-template-columns: 1fr; }
  .port { width: min(100%, 280px); border-width: 10px; }
  .nav-toggle { display: inline-block; }
  .bar { flex-wrap: wrap; }
  .nav-links {
    display: none;
    width: 100%;
    flex-direction: column;
    background: #152028;
    padding: 12px;
  }
  .nav-links.open { display: flex; }
  h1 { font-size: 34px; }
}