:root {
  --paper: #f3eee4;
  --ink: #1c1712;
  --ink-soft: #5c5348;
  --rule: #d4c9b6;
  --cinnabar: #b42318;
  --chip: #2f2a24;
  --shadow: 0 18px 40px rgba(28, 23, 18, 0.08);
  --serif: "Iowan Old Style", "Palatino Linotype", "Songti SC", "STSong", serif;
  --sans: "PingFang SC", "Hiragino Sans GB", "Noto Sans SC", "Microsoft YaHei", sans-serif;
  --mono: "SF Mono", Menlo, monospace;
}

* { box-sizing: border-box; }
html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}
html, body { overflow-x: hidden; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  line-height: 1.7;
  min-height: 100vh;
}

a { color: inherit; }
img { max-width: 100%; height: auto; }

.wrap {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 16px;
  padding-left: max(16px, env(safe-area-inset-left));
  padding-right: max(16px, env(safe-area-inset-right));
}

.masthead {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 16px 0 14px;
  border-bottom: 1px solid var(--rule);
}
.brand {
  display: flex;
  align-items: baseline;
  gap: 10px;
  text-decoration: none;
}
.brand-mark {
  font-family: var(--serif);
  font-size: 20px;
  letter-spacing: 0.08em;
  font-weight: 700;
}
.brand-sub {
  display: none;
  color: var(--ink-soft);
  font-size: 12px;
  letter-spacing: 0.14em;
}
.menu-btn { display: none; }
.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 16px;
  align-items: center;
  font-size: 14px;
}
.nav a {
  text-decoration: none;
  color: var(--ink-soft);
  min-height: 44px;
  display: inline-flex;
  align-items: center;
}
.nav a:hover,
.nav a.is-current { color: var(--ink); }
.nav .cta {
  background: var(--ink);
  color: var(--paper) !important;
  padding: 8px 14px;
  min-height: 40px;
}

.hero { padding: 28px 0 20px; }
.spine {
  color: var(--cinnabar);
  font-family: var(--serif);
  font-size: 13px;
  letter-spacing: 0.18em;
  margin-bottom: 12px;
}
.hero h1 {
  font-family: var(--serif);
  font-size: 32px;
  line-height: 1.2;
  margin: 0 0 14px;
  font-weight: 700;
  word-break: break-word;
}
.lede {
  font-size: 16px;
  color: var(--ink-soft);
  margin: 0 0 18px;
}
.meta-row {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  color: var(--ink-soft);
  font-size: 12px;
}
.side-card {
  border: 1px solid var(--rule);
  padding: 16px;
  background: rgba(255,255,255,0.35);
  margin-top: 18px;
}
.side-card h2 {
  margin: 0 0 8px;
  font-size: 13px;
  letter-spacing: 0.12em;
}
.side-card p { margin: 0; color: var(--ink-soft); font-size: 14px; }

.section-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 12px;
  border-top: 2px solid var(--ink);
  padding: 14px 0 16px;
  margin-top: 8px;
}
.section-head h2 {
  margin: 0;
  font-family: var(--serif);
  font-size: 24px;
}
.section-head a {
  color: var(--cinnabar);
  text-decoration: none;
  font-size: 14px;
  white-space: nowrap;
}

.grid { padding-bottom: 28px; }
.note {
  display: block;
  padding: 18px;
  margin-bottom: 14px;
  background: #fffdf8;
  border: 1px solid var(--rule);
  text-decoration: none;
}
.note.featured { min-height: 0; }
.kicker {
  color: var(--cinnabar);
  font-size: 12px;
  letter-spacing: 0.14em;
  margin-bottom: 10px;
}
.note h3 {
  font-family: var(--serif);
  font-size: 22px;
  line-height: 1.3;
  margin: 0 0 10px;
}
.note p {
  color: var(--ink-soft);
  margin: 0 0 12px;
}
.note .more { font-size: 13px; }

.topics { padding-bottom: 36px; }
.topic {
  border-top: 1px solid var(--rule);
  padding: 12px 0;
}
.topic strong { display: block; font-family: var(--serif); font-size: 18px; }
.topic span { color: var(--ink-soft); font-size: 13px; }

.page { padding: 28px 0 48px; }
.page-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 14px;
  margin-bottom: 20px;
}
.page-nav a {
  text-decoration: none;
  color: var(--ink-soft);
  font-size: 14px;
  min-height: 40px;
  display: inline-flex;
  align-items: center;
}
.page-nav .now { color: var(--ink); }
.article h1 {
  font-family: var(--serif);
  font-size: 28px;
  line-height: 1.25;
  margin: 0 0 10px;
  word-break: break-word;
}
.article .byline {
  color: var(--ink-soft);
  font-size: 14px;
  margin-bottom: 20px;
}
.article p { font-size: 16px; }
.article h2 {
  font-family: var(--serif);
  font-size: 20px;
  margin: 28px 0 8px;
}
.article ul { padding-left: 1.2em; }
.article code, .article pre { font-family: var(--mono); font-size: 0.9em; }
.article pre {
  background: var(--chip);
  color: #f3eee4;
  padding: 14px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  line-height: 1.55;
  max-width: 100%;
}
.article table { width: 100%; border-collapse: collapse; font-size: 14px; }
.article .table-wrap {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  margin: 12px 0;
}
.article th, .article td {
  border-bottom: 1px solid var(--rule);
  text-align: left;
  padding: 8px 6px;
  vertical-align: top;
  word-break: break-word;
}

.site-footer {
  border-top: 1px solid var(--rule);
  padding: 18px 0 32px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  color: var(--ink-soft);
  font-size: 13px;
}
.footer-meta {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.beian {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 16px;
}
.beian a {
  color: var(--ink-soft);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.beian a:hover { text-decoration: underline; }
.beian-gongan img {
  width: 16px;
  height: 16px;
  max-width: none;
  flex-shrink: 0;
}

@media (min-width: 720px) {
  .wrap { padding: 0 20px; }
  .brand-sub { display: inline; }
  .hero h1 { font-size: 44px; }
  .article h1 { font-size: 36px; }
  .grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
  }
  .note { margin-bottom: 0; }
  .note.featured { grid-column: 1 / -1; }
  .topics {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px 24px;
  }
  .footer-meta {
    flex-direction: row;
    justify-content: space-between;
    gap: 16px;
  }
}

@media (min-width: 980px) {
  .hero {
    display: grid;
    grid-template-columns: 72px 1fr 260px;
    gap: 28px;
    padding: 42px 0 28px;
    align-items: start;
  }
  .spine {
    writing-mode: vertical-rl;
    letter-spacing: 0.4em;
    font-size: 15px;
    margin: 0;
    border-right: 1px solid var(--rule);
    padding-right: 16px;
  }
  .side-card { margin-top: 0; }
  .hero h1 { font-size: 56px; }
  .grid { grid-template-columns: 1.4fr 1fr 1fr; }
  .note.featured { grid-column: auto; min-height: 360px; }
  .topics { grid-template-columns: repeat(4, 1fr); }
  .page {
    display: grid;
    grid-template-columns: 200px minmax(0, 720px);
    gap: 42px;
    padding: 42px 0 72px;
  }
  .page-nav {
    display: block;
    margin-bottom: 0;
  }
  .page-nav a { display: block; min-height: 0; padding: 7px 0; }
}