:root {
  --tea: #f3ead8;
  --paper: #fff8ec;
  --wood: #8b5a2b;
  --green: #2f4a3a;
  --green-2: #3f5e4c;
  --slip: #e7c9b2;
  --ink: #241c14;
  --mute: #6d5e4e;
  --display: "ZCOOL XiaoWei", "Noto Serif SC", serif;
  --serif: "Noto Serif SC", "Songti SC", serif;
  --mono: "IBM Plex Mono", ui-monospace, Menlo, monospace;
}
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
section[id] { scroll-margin-top: 76px; }
body {
  margin: 0;
  background: var(--tea);
  color: var(--ink);
  font-family: var(--serif);
  font-size: 17px;
  line-height: 1.85;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
.app-link { color: var(--green); text-decoration: underline; text-underline-offset: 3px; }
button { font-family: inherit; cursor: pointer; }
label { display: block; font-size: 13px; color: var(--mute); margin: 8px 0; }
input[type="range"] { width: min(280px, 100%); accent-color: var(--green); }
.xuan-grain {
  pointer-events: none;
  position: fixed;
  inset: 0;
  z-index: 6;
  opacity: 0.28;
  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(--green); color: var(--tea); padding: 8px; }
.counter {
  position: sticky;
  top: 0;
  z-index: 40;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 28px;
  background: var(--green);
  color: var(--tea);
  border-bottom: 3px solid var(--wood);
}
.seal { font-family: var(--display); font-size: 24px; }
.seal small {
  display: block;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  color: #d5e0d6;
  font-weight: 400;
}
.nav-toggle {
  display: none;
  background: var(--tea);
  color: var(--green);
  border: 0;
  padding: 6px 12px;
  font-weight: 700;
}
.slip-links { display: flex; gap: 14px; font-size: 14px; flex-wrap: wrap; align-items: center; }
.slip-links a { color: #dce6dc; }
.slip-links a.is-active, .slip-links a:hover { color: #fff; }
.slip-links .live { background: var(--tea); color: var(--green); padding: 6px 12px; font-weight: 700; }
.spread {
  display: grid;
  grid-template-columns: 0.86fr 1.14fr;
  min-height: calc(100vh - 64px);
  background:
    linear-gradient(90deg, var(--paper) 0 46%, transparent 46%),
    #e8d7b8;
}
.verso {
  padding: 8vh 40px 8vh 48px;
  border-right: 1px dashed #cbb894;
}
.recto { margin: 0; }
.recto img { width: 100%; height: 100%; object-fit: cover; min-height: 100%; }
.kicker {
  font-family: var(--mono);
  letter-spacing: 0.14em;
  font-size: 11px;
  color: var(--green-2);
  margin: 0 0 12px;
}
h1, h2, h3 { font-family: var(--display); margin: 0 0 12px; line-height: 1.15; font-weight: 400; }
h1 { font-size: clamp(40px, 6vw, 68px); }
h2 { font-size: clamp(26px, 3.2vw, 40px); }
.lead { max-width: 36em; }
.cta { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 18px; }
.btn { display: inline-flex; align-items: center; padding: 10px 16px; font-size: 14px; font-weight: 700; }
.btn.green { background: var(--green); color: var(--tea); }
.btn.paper { background: var(--paper); border: 1px solid var(--green); color: var(--green); }
.gutter { width: min(1000px, calc(100% - 48px)); margin: 0 auto; padding: 72px 0; }
.leaf { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 14px; margin-top: 20px; }
.leaf article {
  background: var(--paper);
  padding: 16px 16px 18px;
  box-shadow: 4px 4px 0 rgba(47, 74, 58, 0.12);
  transform: rotate(-0.4deg);
}
.leaf article:nth-child(2) { transform: rotate(0.5deg); }
.leaf article:nth-child(3) { transform: rotate(-0.2deg); }
.leaf ul { margin: 0; padding-left: 1.1em; }
.chapters { max-width: 46em; }
.chapters li { margin-bottom: 10px; }
.folio { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 24px; }
.folio img { width: 100%; height: 250px; object-fit: cover; }
.folio figcaption { font-size: 13px; color: var(--mute); margin-top: 8px; }
.slip-board {
  background: var(--paper);
  border: 1px solid #d7c7a4;
  padding: 18px;
  max-width: 30em;
  margin: 16px 0;
  position: relative;
}
.slip-board.is-full { outline: 3px solid #8b2e1f; }
.n { font-family: var(--mono); font-size: 44px; margin: 0; color: var(--green); line-height: 1; }
.n span { font-size: 16px; }
.cap { margin: 0 0 8px; color: var(--mute); font-size: 13px; }
.slips { display: flex; flex-wrap: wrap; gap: 6px; min-height: 36px; margin: 10px 0; }
.slips i {
  display: inline-block;
  width: 18px;
  height: 42px;
  background: var(--slip);
  box-shadow: 1px 1px 0 rgba(0,0,0,0.12);
  transform: rotate(-6deg);
}
#flow, #value, #roles { background: #efe3c8; }
#rules ol {
  background: var(--paper);
  padding: 16px 16px 16px 36px;
  border-left: 8px solid var(--green);
  max-width: 46em;
}
.io { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.io > div { background: var(--paper); padding: 16px; }
.url { margin-top: 18px; font-family: var(--mono); font-size: 13px; }
footer { padding: 16px 28px 40px; color: var(--mute); font-size: 13px; }
@media (max-width: 900px) {
  .spread, .leaf, .folio, .io { grid-template-columns: 1fr; }
  .recto img { min-height: 42vh; height: 42vh; }
  .verso { padding: 32px 20px; border-right: 0; }
  .nav-toggle { display: inline-block; }
  .counter { flex-wrap: wrap; }
  .slip-links {
    display: none;
    width: 100%;
    flex-direction: column;
    padding: 8px 0;
  }
  .slip-links.open { display: flex; }
}