:root {
  --paper: #f4ecdf;
  --paper-2: #ebe0cd;
  --ink: #2a2520;
  --ink-soft: #5b5146;
  --rule: #d6c7ae;
  --accent: #9a6a34;
  --accent-ink: #fff8ee;
  --card: #fbf6ee;
  --placeholder: #a1572f;
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, "Book Antiqua", Georgia, "Songti SC", "Songti TC", "Noto Serif CJK SC", "Noto Serif CJK TC", "Source Han Serif", serif;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", "PingFang SC", "PingFang TC", "Microsoft YaHei", "Microsoft JhengHei", sans-serif;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
}
@media (prefers-color-scheme: dark) {
  :root {
    --paper: #1d1a17;
    --paper-2: #24201c;
    --ink: #ece3d4;
    --ink-soft: #b9ad9b;
    --rule: #3d362e;
    --accent: #d39a58;
    --accent-ink: #1d1a17;
    --card: #26221d;
    --placeholder: #e08a5c;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--serif);
  font-size: 18px;
  line-height: 1.7;
}
:lang(zh) body, body:lang(zh) { line-height: 1.85; }
a { color: var(--accent); text-underline-offset: 3px; }
a:hover { text-decoration-thickness: 2px; }
img { max-width: 100%; height: auto; display: block; }

.wrap { max-width: 1040px; margin: 0 auto; padding: 0 20px; }

/* Header */
.site-head {
  border-bottom: 1px solid var(--rule);
  font-family: var(--sans);
  font-size: 14px;
}
.site-head .wrap {
  display: flex; align-items: center; justify-content: space-between;
  gap: 16px; min-height: 56px; flex-wrap: wrap;
}
.brand { color: var(--ink); text-decoration: none; letter-spacing: .08em; text-transform: uppercase; font-weight: 600; }
.nav { display: flex; gap: 18px; flex-wrap: wrap; }
.nav a { color: var(--ink-soft); text-decoration: none; }
.nav a:hover { color: var(--accent); }
.lang { display: flex; gap: 4px; }
.lang a {
  color: var(--ink-soft); text-decoration: none; padding: 2px 8px; border-radius: 4px;
  border: 1px solid transparent;
}
.lang a[aria-current="true"] { border-color: var(--rule); color: var(--ink); }

/* Hero */
.hero { padding: 56px 0 40px; }
.hero .wrap { display: grid; grid-template-columns: minmax(220px, 340px) 1fr; gap: 48px; align-items: center; }
.cover {
  border-radius: 4px;
  box-shadow: 0 18px 40px rgba(60, 40, 15, .22), 0 2px 6px rgba(60, 40, 15, .18);
}
.eyebrow { font-family: var(--sans); font-size: 13px; letter-spacing: .12em; text-transform: uppercase; color: var(--accent); margin: 0 0 12px; }
.hero h1 { font-size: clamp(30px, 4.4vw, 46px); line-height: 1.15; margin: 0 0 14px; font-weight: 600; }
.hero .alt-title { font-size: 17px; color: var(--ink-soft); margin: -6px 0 14px; font-style: italic; }
.hero .subtitle { font-size: 20px; color: var(--ink-soft); margin: 0 0 18px; }
.hero .byline { font-family: var(--sans); font-size: 15px; letter-spacing: .04em; margin: 0 0 26px; }
.hero .tagline { font-size: 21px; margin: 0 0 28px; border-left: 3px solid var(--accent); padding-left: 16px; }
.btns { display: flex; gap: 12px; flex-wrap: wrap; font-family: var(--sans); font-size: 15px; }
.btn {
  display: inline-block; padding: 10px 18px; border-radius: 6px; text-decoration: none;
  border: 1px solid var(--accent); color: var(--accent);
}
.btn.primary { background: var(--accent); color: var(--accent-ink); }

/* Sections */
section { padding: 44px 0; border-top: 1px solid var(--rule); }
section h2 { font-size: 28px; margin: 0 0 20px; font-weight: 600; }
.prose { max-width: 720px; }
.prose p { margin: 0 0 1em; }
.note {
  max-width: 720px; background: var(--card); border: 1px solid var(--rule);
  border-radius: 8px; padding: 16px 20px; font-size: 16px; color: var(--ink-soft);
}

/* Editions */
.editions { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.edition {
  background: var(--card); border: 1px solid var(--rule); border-radius: 8px; padding: 18px;
  display: flex; gap: 14px; align-items: flex-start; text-decoration: none; color: var(--ink);
}
.edition img { width: 72px; border-radius: 2px; box-shadow: 0 4px 10px rgba(60, 40, 15, .18); }
.edition strong { display: block; font-size: 17px; margin-bottom: 4px; }
.edition span { font-size: 15px; color: var(--ink-soft); line-height: 1.5; display: block; }
.edition[aria-current="true"] { border-color: var(--accent); }

/* Contents */
.toc { columns: 2; column-gap: 40px; max-width: 900px; }
.toc .part { break-inside: avoid; margin: 0 0 18px; }
.toc h3 { font-family: var(--sans); font-size: 13px; letter-spacing: .1em; text-transform: uppercase; color: var(--accent); margin: 0 0 6px; }
.toc ol { list-style: none; margin: 0; padding: 0; }
.toc li { padding: 3px 0; font-size: 17px; }
.toc .num { display: inline-block; min-width: 2.2em; color: var(--ink-soft); font-family: var(--sans); font-size: 14px; }
:lang(zh) .toc .num { min-width: 4.6em; }

/* Buy & support */
.stores { display: flex; flex-wrap: wrap; gap: 10px; font-family: var(--sans); font-size: 15px; margin: 0 0 14px; }
.store { padding: 9px 16px; border: 1px solid var(--rule); border-radius: 6px; text-decoration: none; color: var(--ink); background: var(--card); }
.store.soon { color: var(--ink-soft); }
.store.soon::after { content: attr(data-soon); margin-left: 8px; font-size: 12px; color: var(--placeholder); }

.wallets { display: grid; gap: 14px; max-width: 760px; }
.wallet { background: var(--card); border: 1px solid var(--rule); border-radius: 8px; padding: 14px 18px; }
.wallet .label { font-family: var(--sans); font-size: 14px; font-weight: 600; margin-bottom: 6px; }
.wallet .label small { font-weight: 400; color: var(--ink-soft); }
.addr-row { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
.addr { font-family: var(--mono); font-size: 14px; word-break: break-all; flex: 1 1 260px; }
.copy { font-family: var(--sans); font-size: 13px; padding: 5px 12px; border-radius: 5px; border: 1px solid var(--rule); background: transparent; color: var(--ink); cursor: pointer; }
.copy:disabled { opacity: .45; cursor: default; }

.placeholder { color: var(--placeholder); font-style: italic; }

/* Footer */
.site-foot { border-top: 1px solid var(--rule); padding: 28px 0 40px; font-family: var(--sans); font-size: 14px; color: var(--ink-soft); }
.site-foot .wrap { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px; }

@media (max-width: 760px) {
  body { font-size: 17px; }
  .hero { padding: 32px 0 24px; }
  .hero .wrap { grid-template-columns: 1fr; gap: 28px; }
  .cover { max-width: 240px; margin: 0 auto; }
  .editions { grid-template-columns: 1fr; }
  .toc { columns: 1; }
  .nav { display: none; }
}

/* Safety for narrow screens and long chapter titles */
.hero .wrap > *, .editions > *, .wallets > * { min-width: 0; }
.toc li { display: flex; gap: .4em; }
.toc .num { flex: none; }
h1, .subtitle, .tagline { overflow-wrap: break-word; }