/* 一竿 · 静态页。宣纸底、墨字、朱印；只用系统字体，不引外部资源。 */

:root {
  --silk: #e7dfcb;
  --silk-deep: #d6cdba;
  --rule: #cbc1aa;
  --ink: #2a251e;
  --ink-soft: #6a5f50;
  --ink-faint: rgba(42, 37, 30, 0.38);
  --cinnabar: #a83a2b;
  --ochre: #94683f;
  --song: "Songti SC", "STSong", "Noto Serif SC", "Noto Serif CJK SC", "Source Han Serif SC", "SimSun", serif;
  --kai: "Kaiti SC", "STKaiti", "KaiTi", "LXGW WenKai", var(--song);
  --latin: "Iowan Old Style", "Palatino", "Georgia", serif;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; color-scheme: light; }

body {
  margin: 0;
  background: var(--silk);
  background-image:
    radial-gradient(ellipse at 20% 0%, rgba(255, 250, 235, 0.55), transparent 60%),
    radial-gradient(ellipse at 90% 100%, rgba(148, 104, 63, 0.08), transparent 55%);
  background-attachment: fixed;
  color: var(--ink);
  font-family: var(--song);
  font-size: 17px;
  line-height: 1.9;
  text-rendering: optimizeLegibility;
}

html[lang="en"] body { font-family: var(--latin), var(--song); line-height: 1.7; }

.sheet {
  max-width: 44rem;
  margin: 0 auto;
  padding: 3rem 1.5rem 4rem;
}

header.mast {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  padding-bottom: 1.25rem;
  border-bottom: 1px solid var(--ink-faint);
  margin-bottom: 2rem;
}

.brand { display: flex; align-items: center; gap: 0.9rem; text-decoration: none; color: inherit; }

.seal {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.6rem;
  height: 2.6rem;
  border: 2px solid var(--cinnabar);
  border-radius: 3px;
  color: var(--cinnabar);
  font-family: var(--song);
  font-weight: 700;
  font-size: 0.95rem;
  line-height: 1;
  writing-mode: vertical-rl;
  letter-spacing: 0.1em;
  transform: rotate(-2deg);
  flex: none;
}

.brand-name { font-size: 1.35rem; letter-spacing: 0.3em; }
html[lang="en"] .brand-name { letter-spacing: 0.04em; }

nav.lang { font-size: 0.85rem; padding-top: 0.4rem; white-space: nowrap; }
nav.lang a { color: var(--ink-soft); }

h1 {
  font-size: 1.9rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  margin: 0 0 0.4rem;
}
html[lang="en"] h1 { letter-spacing: 0.01em; }

.meta { color: var(--ink-soft); font-size: 0.85rem; margin: 0 0 2rem; }

h2 {
  font-size: 1.2rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  margin: 2.6rem 0 0.8rem;
  padding-left: 0.8rem;
  border-left: 3px solid var(--cinnabar);
  line-height: 1.5;
}
html[lang="en"] h2 { letter-spacing: 0; }

h3 { font-size: 1.02rem; font-weight: 600; margin: 1.6rem 0 0.4rem; }

p, ul, ol, table { margin: 0 0 1rem; }
ul, ol { padding-left: 1.4rem; }
li { margin: 0.25rem 0; }

a { color: var(--cinnabar); text-underline-offset: 0.2em; text-decoration-thickness: 1px; }

strong { font-weight: 600; }

.lead {
  font-family: var(--kai);
  font-size: 1.12rem;
  color: var(--ink);
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  padding: 1rem 0.2rem;
  margin: 0 0 2rem;
}
html[lang="en"] .lead { font-family: var(--latin); font-style: italic; }

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
  line-height: 1.7;
}
th, td {
  text-align: left;
  vertical-align: top;
  padding: 0.55rem 0.6rem;
  border-bottom: 1px solid var(--rule);
}
th { font-weight: 600; color: var(--ink-soft); border-bottom: 1px solid var(--ink-faint); }
.table-wrap { overflow-x: auto; margin: 0 0 1rem; }

.note {
  background: rgba(214, 205, 186, 0.55);
  border: 1px solid var(--rule);
  padding: 0.9rem 1.1rem;
  font-size: 0.93rem;
  margin: 0 0 1rem;
}

.badge {
  display: inline-block;
  font-size: 0.75rem;
  line-height: 1.4;
  padding: 0.05rem 0.45rem;
  border: 1px solid var(--ochre);
  color: var(--ochre);
  border-radius: 2px;
  vertical-align: 0.15em;
  margin-left: 0.4rem;
  letter-spacing: 0.05em;
}

.todo {
  background: rgba(168, 58, 43, 0.12);
  color: var(--cinnabar);
  padding: 0 0.25em;
  border-radius: 2px;
}

.toc {
  font-size: 0.92rem;
  columns: 2;
  column-gap: 2rem;
  padding-left: 1.2rem;
  margin-bottom: 2rem;
}
@media (max-width: 560px) { .toc { columns: 1; } }

.cards { list-style: none; padding: 0; display: grid; gap: 0.8rem; }
.cards a {
  display: block;
  padding: 1rem 1.2rem;
  border: 1px solid var(--rule);
  background: rgba(255, 252, 242, 0.35);
  color: var(--ink);
  text-decoration: none;
}
.cards a:hover { border-color: var(--cinnabar); }
.cards .t { font-size: 1.08rem; font-weight: 600; letter-spacing: 0.1em; }
html[lang="en"] .cards .t { letter-spacing: 0; }
.cards .s { display: block; color: var(--ink-soft); font-size: 0.88rem; }

footer {
  margin-top: 3.5rem;
  padding-top: 1.2rem;
  border-top: 1px solid var(--ink-faint);
  color: var(--ink-soft);
  font-size: 0.82rem;
}
footer a { color: var(--ink-soft); margin-right: 1rem; }

@media (max-width: 560px) {
  body { font-size: 16px; }
  .sheet { padding: 2rem 1.1rem 3rem; }
  h1 { font-size: 1.6rem; }
}

@media print {
  body { background: #fff; }
  nav.lang, footer { display: none; }
}