:root {
  --clay: #8b3a2f;
  --stamp: #c41e3a;
  --lime: #f4efe4;
  --ink: #2a2218;
  --blue: #1e4b8c;
  --paper: #fbf7ee;
  --warn: #9a3412;
  --locked: #7a1f1a;
  --display: "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: 70px; }

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  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(--blue); text-decoration: underline; text-underline-offset: 3px; }
button { font-family: inherit; cursor: pointer; }
code { font-family: var(--mono); background: #ead9c8; padding: 0.05em 0.35em; }

.fiber {
  pointer-events: none;
  position: fixed;
  inset: 0;
  z-index: 6;
  opacity: 0.22;
  background-image: url("images/texture.webp");
  background-size: 360px auto;
  mix-blend-mode: multiply;
}

.skip { position: absolute; left: -999px; }
.skip:focus { left: 10px; top: 10px; z-index: 80; background: var(--stamp); color: #fff; padding: 8px; }

.spine {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 0 18px 0 28px;
  min-height: 62px;
  background: var(--clay);
  color: var(--lime);
  box-shadow: inset 10px 0 0 var(--stamp);
}
.brand { font-family: var(--display); font-size: 24px; }
.brand small {
  display: block;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  opacity: 0.85;
}
.leaf-links { display: flex; flex-wrap: wrap; gap: 8px 14px; font-size: 14px; }
.leaf-links a.is-active { text-decoration: underline; text-underline-offset: 4px; }
.leaf-links .live { background: var(--lime); color: var(--clay); padding: 6px 12px; font-weight: 700; }
.nav-toggle { display: none; background: transparent; color: var(--lime); border: 1px solid var(--lime); padding: 6px 12px; }

.hero { position: relative; }
.hero > img { width: 100%; height: 78vh; object-fit: cover; }
.page-card {
  position: absolute;
  right: 6vw;
  bottom: -40px;
  width: min(560px, 92vw);
  background: var(--lime);
  padding: 32px 28px 28px;
  border: 1px solid #d8c8b0;
  box-shadow: 8px 12px 0 rgba(139, 58, 47, 0.25);
}
.kicker { font-family: var(--mono); font-size: 12px; letter-spacing: 0.16em; color: var(--stamp); margin: 0 0 8px; }
h1, h2, h3 { font-family: var(--display); line-height: 1.2; margin: 0 0 12px; }
h1 { font-size: clamp(32px, 5vw, 48px); }
h1 em { font-style: normal; color: var(--stamp); }
h2 { font-size: clamp(26px, 3.4vw, 36px); color: var(--clay); }
.lead, .quiet { margin-top: 0; }
.quiet { color: #5c5146; }

.cta { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 16px; }
.btn { display: inline-block; padding: 10px 16px; border: 1px solid var(--clay); font-weight: 700; }
.btn.fill { background: var(--stamp); color: #fff; border-color: var(--stamp); }
.btn.ghost { background: transparent; color: var(--clay); }

.wrap { width: min(1080px, calc(100% - 40px)); margin: 0 auto; padding: 88px 0 64px; }
.lime { background: #efe6d6; }
.three, .four, .io { display: grid; gap: 16px; }
.three { grid-template-columns: repeat(3, 1fr); }
.four { grid-template-columns: repeat(4, 1fr); }
.three article, .four article, .io > div {
  background: #fffdf8;
  border: 1px solid #e2d3bf;
  padding: 18px;
}
.three .warn { border-color: var(--stamp); }
ul { margin: 0; padding-left: 1.1em; }
li + li { margin-top: 6px; }

.ribbon {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 0;
  list-style: none;
  padding: 0;
  margin: 0 0 36px;
  counter-reset: r;
}
.ribbon li {
  counter-increment: r;
  padding: 12px;
  background: #fffdf8;
  border: 1px dashed var(--clay);
  font-size: 14px;
}
.ribbon li::before {
  content: counter(r, decimal-leading-zero);
  display: block;
  font-family: var(--mono);
  color: var(--stamp);
  font-size: 11px;
}

.spread {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
  align-items: center;
  margin-bottom: 40px;
}
.spread.reverse figure { order: -1; }
.num { font-family: var(--mono); color: var(--blue); font-size: 12px; letter-spacing: 0.12em; }
figure { margin: 0; }
figcaption { font-size: 13px; color: #5c5146; margin-top: 8px; }

.stamp-board {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 20px;
  background: #fffdf8;
  border: 2px solid var(--clay);
  padding: 20px;
}
.stamp-grid { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 10px; }
.stamp-cell {
  min-height: 110px;
  border: 2px solid var(--clay);
  background: #fbf7ee;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 10px;
  text-align: left;
}
.stamp-cell small { font-family: var(--mono); font-size: 11px; color: var(--blue); }
.stamp-cell.on { background: #f8e6e4; }
.seal {
  align-self: flex-end;
  width: 64px;
  height: 64px;
  border: 3px solid var(--stamp);
  border-radius: 50%;
  color: var(--stamp);
  font-family: var(--display);
  font-size: 13px;
  display: grid;
  place-items: center;
  transform: rotate(-12deg);
  opacity: 0;
}
.stamp-cell.on .seal { opacity: 1; }
.pay { font-weight: 700; }
.pay.locked { color: var(--locked); }
.pay.open { color: #1f6b3a; }
.objection {
  font-size: 14px;
  border-left: 4px solid var(--blue);
  padding-left: 10px;
  color: #3a332b;
}

.bound { padding-left: 1.2em; }
.io { grid-template-columns: 1fr 1fr; }

footer {
  padding: 24px 20px 48px;
  background: var(--clay);
  color: var(--lime);
  font-size: 14px;
}
footer .app-link { color: #ffe7c2; }

@media (max-width: 900px) {
  .nav-toggle { display: inline-block; }
  .leaf-links {
    display: none;
    position: absolute;
    top: 62px;
    left: 0;
    right: 0;
    background: var(--clay);
    padding: 12px 18px 18px;
    flex-direction: column;
    align-items: flex-start;
  }
  .leaf-links.open { display: flex; }
  .hero > img { height: 52vh; }
  .page-card { position: relative; right: auto; bottom: auto; width: auto; margin: -24px 16px 0; }
  .three, .four, .spread, .spread.reverse, .stamp-board, .io, .ribbon {
    grid-template-columns: 1fr;
  }
  .spread.reverse figure { order: 0; }
  .stamp-grid { grid-template-columns: 1fr 1fr; }
}