/* Vera · Docsflow 纸白克制版（网站 2.0 气质） */
:root {
  --paper: #F6F4EF;
  --card: #FFFFFF;
  --line: #E6E3DB;
  --navy: #071A3D;
  --muted: #55647A;
  --teal: #006E76; /* 纸白上青字/眉标；不用亮青做字 */
  --signal: #17D8E3; /* 仅强调实底 + 夜条标题行；本页纸白默认少用 */
  --max: 760px;
  --side: 28px;
  --r-card: 24px;
  --r-soft: 16px;
  --r-pill: 999px;
}

* { box-sizing: border-box; }
html { color-scheme: light; }
body {
  margin: 0;
  min-height: 100vh;
  font-family: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Open Sans", "Microsoft YaHei", sans-serif;
  font-size: 16.5px;
  font-weight: 400;
  line-height: 1.7;
  color: var(--navy);
  background: var(--paper);
}

.page { min-height: 100vh; display: flex; flex-direction: column; }

.wrap {
  width: min(var(--max), calc(100% - 2 * var(--side)));
  margin-inline: auto;
}

.top {
  background: var(--paper);
  border-bottom: 1px solid var(--line);
  padding: 1.1rem 0 1rem;
}

.brand {
  margin: 0;
  font-family: "Open Sans", "Noto Sans SC", sans-serif;
  font-size: 0.92rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  color: var(--navy);
}

.tag {
  margin: 0.15rem 0 0;
  font-size: 0.85rem;
  color: var(--muted);
}

main { flex: 1; padding: 2.5rem 0 3.5rem; }

.intro { margin-bottom: 2.75rem; }

h1 {
  margin: 0 0 0.9rem;
  font-size: clamp(1.75rem, 3vw, 2.1rem); /* ~28–34px */
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.02em;
  color: var(--navy);
}

.lead {
  margin: 0;
  max-width: 40rem;
  color: var(--muted);
  font-size: 1.02rem;
}

.block {
  margin: 0 0 3rem; /* ~48px section rhythm */
}

.block:last-of-type { margin-bottom: 0; }

h2 {
  margin: 0 0 0.85rem;
  font-size: 1.3rem; /* ~21px */
  font-weight: 700;
  line-height: 1.35;
  color: var(--navy);
}

.block > p {
  margin: 0 0 0.85rem;
  color: var(--muted);
  max-width: 40rem;
}

.block > p:last-child { margin-bottom: 0; }

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--r-card);
  padding: 1.35rem 1.4rem; /* ~22px */
}

.card-soft {
  border-radius: var(--r-soft);
  position: relative;
}

.pill {
  display: inline-block;
  margin: 0 0 0.9rem;
  padding: 0.28rem 0.75rem;
  border-radius: var(--r-pill);
  background: var(--signal);
  color: var(--navy);
  font-family: "Open Sans", "Noto Sans SC", sans-serif;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.04em;
}

ul {
  margin: 0;
  padding-left: 1.15rem;
  color: var(--navy);
}

li { margin: 0.4rem 0; color: var(--muted); }
li::marker { color: var(--teal); }

.meta {
  margin: 0;
  display: grid;
  gap: 0.75rem;
}

.meta > div {
  display: grid;
  grid-template-columns: 6.5rem 1fr;
  gap: 0.75rem;
  align-items: baseline;
  padding-bottom: 0.7rem;
  border-bottom: 1px solid var(--line);
}

.meta > div:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

dt {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

dd {
  margin: 0;
  font-family: "Open Sans", "Noto Sans SC", sans-serif;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--navy);
}

.foot {
  border-top: 1px solid var(--line);
  padding: 1.15rem 0 1.5rem;
}

.foot p {
  margin: 0;
  color: var(--muted);
  font-family: "Open Sans", "Noto Sans SC", sans-serif;
  font-size: 0.85rem;
}

@media (max-width: 560px) {
  :root { --side: 20px; }
  .meta > div { grid-template-columns: 1fr; gap: 0.2rem; }
  .block { margin-bottom: 2.4rem; }
}

.foot-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem 1.25rem;
}

.foot .rev { margin: 0; }

.icp {
  margin: 0;
  font-family: "Open Sans", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 0.85rem;
  font-variant-numeric: tabular-nums;
}

.icp a {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.icp a:hover {
  color: var(--teal);
  border-bottom-color: rgba(0, 110, 118, 0.35);
}