:root {
  --shelf: #f4eee4;
  --shelf-2: #fffaf2;
  --char: #1a1a1a;
  --cyan: #20e0c8;
  --stale: #e06020;
  --ink: #1a1a1a;
  --mute: #6a6a64;
  --display: "Sora", "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: 64px; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--shelf);
  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: #0a8a7a; 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(--stale); }
.eink {
  pointer-events: none;
  position: fixed;
  inset: 0;
  z-index: 6;
  opacity: 0.1;
  background-image: url("images/texture.webp");
  background-size: 280px auto;
  mix-blend-mode: multiply;
}
.skip { position: absolute; left: -999px; }
.skip:focus { left: 12px; top: 12px; z-index: 80; background: var(--cyan); color: #1a1a1a; padding: 8px; }
.rail {
  position: sticky;
  top: 0;
  z-index: 40;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 22px;
  background: var(--char);
  color: #f4eee4;
}
.brand { font-family: var(--display); font-weight: 700; letter-spacing: -0.03em; }
.brand small {
  display: block;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  color: #8a8a84;
  font-weight: 400;
}
.nav-toggle {
  display: none;
  background: var(--cyan);
  color: #1a1a1a;
  border: 0;
  padding: 6px 12px;
  font-weight: 700;
}
.tag-links { display: flex; gap: 14px; font-size: 14px; flex-wrap: wrap; }
.tag-links a { color: #8a8a84; }
.tag-links a.is-active, .tag-links a:hover { color: var(--cyan); }
.tag-links .live { background: var(--cyan); color: #1a1a1a; padding: 6px 12px; font-weight: 700; }
.bay {
  display: grid;
  grid-template-columns: 1.12fr 0.88fr;
  min-height: calc(100vh - 54px);
}
.bay figure { margin: 0; }
.bay img { width: 100%; height: 100%; object-fit: cover; min-height: 100%; }
.warm { padding: 7vh 32px; background: var(--shelf-2); }
.kicker {
  font-family: var(--mono);
  letter-spacing: 0.16em;
  font-size: 11px;
  color: #0a8a7a;
  margin: 0 0 12px;
}
h1, h2, h3 { font-family: var(--display); margin: 0 0 12px; line-height: 1.12; letter-spacing: -0.03em; }
h1 { font-size: clamp(30px, 4.4vw, 48px); }
h2 { font-size: clamp(22px, 2.8vw, 34px); }
.lead { max-width: 40em; color: #4a4a44; }
.esl {
  margin: 20px 0;
  padding: 14px 16px;
  background: #111;
  color: #f4eee4;
  max-width: 30em;
  border-left: 6px solid var(--stale);
  font-family: var(--mono);
}
.esl.is-ok { border-left-color: var(--cyan); }
.esl .kicker { color: var(--cyan); }
.n { font-family: var(--display); font-size: 44px; margin: 0 0 6px; color: var(--cyan); }
.n span { font-size: 16px; color: #8a8a84; }
.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-weight: 700; }
.btn.cyan { background: var(--cyan); color: #1a1a1a; border-color: var(--cyan); }
.btn.line { color: var(--char); font-weight: 400; }
.w { width: min(1040px, calc(100% - 40px)); margin: 0 auto; padding: 72px 0; }
.ink { background: var(--char); color: #f4eee4; }
.ink .kicker { color: var(--cyan); }
.tri { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 12px; margin-top: 20px; }
.tri article { background: #fff; color: var(--ink); padding: 16px; }
.ink .tri article { background: #222; color: #f4eee4; }
.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: #8a8a84; margin-top: 8px; }
#need, #fresh, #rules { background: var(--shelf); }
#rules ol {
  background: #fff;
  padding: 16px 16px 16px 36px;
  border-left: 8px solid var(--stale);
  max-width: 46em;
}
.io { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.io > div { background: #222; 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) {
  .bay, .tri, .pair, .io { grid-template-columns: 1fr; }
  .bay img { min-height: 42vh; height: 42vh; }
  .nav-toggle { display: inline-block; }
  .rail { flex-wrap: wrap; }
  .tag-links {
    display: none;
    width: 100%;
    flex-direction: column;
    background: #111;
    padding: 12px;
  }
  .tag-links.open { display: flex; }
  .warm { padding: 28px 18px 36px; }
}