:root {
  --shadow: #2a2b28;
  --linen: #e7e0d2;
  --linen-2: #f4efe4;
  --bronze: #5e7a6a;
  --rust: #8a6a3e;
  --ink: #1e1f1c;
  --mute: #6f6a60;
  --dash: #9aa397;
  --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: 74px; }

body {
  margin: 0;
  background: var(--linen-2);
  color: 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(--bronze); text-decoration: underline; text-underline-offset: 3px; }
button { font-family: inherit; cursor: pointer; }

.linen {
  pointer-events: none;
  position: fixed;
  inset: 0;
  z-index: 40;
  opacity: 0.18;
  background-image: url("images/texture.webp");
  background-size: 420px;
  mix-blend-mode: multiply;
}

.skip { position: absolute; left: -999px; }
.skip:focus { left: 12px; top: 12px; z-index: 60; background: var(--bronze); color: #fff; padding: 8px 12px; }

.head {
  position: sticky;
  top: 0;
  z-index: 30;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 28px;
  background: rgba(244, 239, 228, 0.92);
  border-bottom: 1px solid rgba(94, 122, 106, 0.25);
}
.brand { font-family: var(--serif); font-weight: 700; }
.brand small {
  display: block;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  color: var(--mute);
  font-weight: 400;
}
.nav-toggle {
  display: none;
  background: transparent;
  border: 1px solid var(--bronze);
  color: var(--bronze);
  padding: 6px 12px;
}
.nav-links { display: flex; flex-wrap: wrap; gap: 14px; font-size: 14px; }
.nav-links a { color: var(--mute); }
.nav-links a.is-active, .nav-links a:hover { color: var(--bronze); }
.nav-links .live { background: var(--bronze); color: #fff; padding: 5px 12px; }

.hero { position: relative; min-height: 100vh; color: var(--linen); }
.hero > img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.mist {
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, rgba(42, 43, 40, 0.82) 0%, rgba(42, 43, 40, 0.35) 70%, rgba(42, 43, 40, 0.55) 100%);
}
.hero-text {
  position: relative;
  z-index: 1;
  width: min(980px, calc(100% - 48px));
  margin: 0 auto;
  padding: 16vh 0 8vh;
}
.kicker, .vlabel, .n {
  font-family: var(--mono);
  letter-spacing: 0.16em;
  font-size: 12px;
  color: var(--bronze);
  margin: 0 0 10px;
}
.hero .kicker { color: #c5d4cc; }
h1, h2, h3 { font-family: var(--serif); margin: 0 0 14px; line-height: 1.12; }
h1 { font-size: clamp(40px, 6vw, 76px); }
h2 { font-size: clamp(26px, 3vw, 38px); }
h3 { font-size: 22px; }
.lead { max-width: 40em; color: rgba(231, 224, 210, 0.92); }

.sheets {
  margin: 28px 0;
  background: rgba(244, 239, 228, 0.12);
  border: 1px dashed rgba(231, 224, 210, 0.55);
  padding: 16px 18px;
  max-width: 560px;
}
.sheet-btns { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 10px; }
.sheet-btns button {
  background: transparent;
  color: var(--linen);
  border: 1px solid rgba(231, 224, 210, 0.5);
  padding: 6px 12px;
}
.sheet-btns button.on { background: var(--linen); color: var(--shadow); }
#sheet-copy { margin: 0; min-height: 3.2em; }

.cta { display: flex; flex-wrap: wrap; gap: 10px; }
.btn { display: inline-flex; padding: 10px 18px; border: 1px solid currentColor; }
.btn.fill { background: var(--linen); color: var(--shadow); border-color: var(--linen); }
.btn.line { color: var(--linen); }

.box { width: min(1080px, calc(100% - 48px)); margin: 0 auto; padding: 84px 0; }
.quiet { color: var(--mute); max-width: 46em; }
.tri { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin-top: 28px; }
.tri article {
  background: #fff;
  padding: 20px;
  border-bottom: 3px solid var(--bronze);
}
.tri ul, .io ul, #rules ol { margin: 0; padding-left: 1.1em; }
.tri li, .io li, #rules li { margin: 0.3em 0; }

.shade { background: #ddd6c7; }
.row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  align-items: center;
  margin: 40px 0;
}
.row.rev { direction: rtl; }
.row.rev > * { direction: ltr; }
.row figure { margin: 0; box-shadow: 0 18px 40px rgba(42, 43, 40, 0.18); }
.row img { width: 100%; height: 280px; object-fit: cover; }

.five { list-style: none; padding: 0; display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.five li { background: #fff; padding: 16px; border-left: 4px solid var(--rust); }
.five strong { display: block; font-family: var(--serif); }

.quad { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.quad article { background: #fff; padding: 20px; }
.quad p { margin: 0; color: var(--mute); }

#rules ol { background: #fff; padding: 20px 20px 20px 40px; border-left: 4px dashed var(--dash); }
.io { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.io > div { background: #fff; padding: 20px; }
.url { margin-top: 28px; font-family: var(--mono); font-size: 13px; }
footer { padding: 24px 28px 40px; color: var(--mute); font-size: 13px; }

@media (max-width: 860px) {
  .tri, .row, .row.rev, .five, .quad, .io { grid-template-columns: 1fr; direction: ltr; }
  .nav-toggle { display: inline-block; }
  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 12px;
    right: 12px;
    background: var(--linen-2);
    flex-direction: column;
    padding: 12px;
    border: 1px solid var(--bronze);
  }
  .nav-links.open { display: flex; }
}