/* 字里光阴 / Dayprose 官网：墨蓝 + 纸色，衬线标题。 */
:root {
  --paper: #faf6ec;
  --card: #ffffff;
  --ink: #1d2a3a;
  --ink-soft: #55606d;
  --indigo: #1e3557;
  --sun: #f2aa3d;
  --rule: #e4dccb;
  --serif: "Noto Serif SC", "Songti SC", "STSong", Georgia, serif;
  --sans: "PingFang SC", "Noto Sans SC", -apple-system, "Helvetica Neue", Arial, sans-serif;
}
@media (prefers-color-scheme: dark) {
  :root { --paper: #121821; --card: #1a2230; --ink: #e8e4da; --ink-soft: #a9b1bb; --indigo: #9db8de; --rule: #2b3646; }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--paper); color: var(--ink); font-family: var(--sans); font-size: 16px; line-height: 1.75; }
a { color: var(--indigo); }
.wrap { max-width: 860px; margin: 0 auto; padding-inline: 20px; }
header.site { padding-block: 20px; display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
header.site a.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; color: var(--ink); font-family: var(--serif); font-weight: 700; font-size: 18px; }
header.site a.brand img { width: 34px; height: 34px; border-radius: 8px; }
header.site nav { display: flex; gap: 18px; font-size: 14px; }
header.site nav a { text-decoration: none; color: var(--ink-soft); }
h1, h2, h3 { font-family: var(--serif); line-height: 1.3; text-wrap: balance; }
.hero { padding-block: 56px 40px; text-align: center; }
.hero img.icon { width: 112px; height: 112px; border-radius: 25px; box-shadow: 0 10px 28px rgba(30, 53, 87, .25); }
.hero h1 { font-size: clamp(36px, 8vw, 56px); margin: 22px 0 6px; letter-spacing: .04em; }
.hero .en { font-family: var(--serif); color: var(--ink-soft); letter-spacing: .12em; text-transform: uppercase; font-size: 13px; }
.hero p.lede { font-size: 19px; color: var(--ink-soft); max-width: 34em; margin: 18px auto 0; }
.badge { display: inline-block; margin-top: 26px; padding: 10px 20px; border-radius: 999px; background: var(--indigo); color: #fff; font-size: 15px; text-decoration: none; }
@media (prefers-color-scheme: dark) { .badge { color: #10161f; } }
.pillars { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 16px; padding-block: 24px 48px; }
.pillar { background: var(--card); border: 1px solid var(--rule); border-radius: 14px; padding: 22px; min-width: 0; }
.pillar h3 { margin: 0 0 8px; font-size: 20px; color: var(--indigo); }
.pillar p { margin: 0; color: var(--ink-soft); font-size: 15px; }
.doc { padding-block: 24px 64px; }
.doc h1 { font-size: 32px; margin-bottom: 4px; }
.doc .meta { color: var(--ink-soft); font-size: 14px; margin-top: 0; }
.doc h2 { font-size: 21px; margin-top: 36px; }
.doc p, .doc li { max-width: 68ch; }
.doc .lang { border-top: 1px solid var(--rule); margin-top: 48px; padding-top: 8px; }
.faq dt { font-weight: 600; margin-top: 18px; }
.faq dd { margin: 4px 0 0; color: var(--ink-soft); }
footer.site { border-top: 1px solid var(--rule); padding-block: 24px 40px; color: var(--ink-soft); font-size: 13px; }
footer.site .row { display: flex; gap: 16px; flex-wrap: wrap; justify-content: space-between; }