/* PURELIGHT — 静态文字页（about / privacy） */

:root {
  --paper: #f7f4ef;
  --paper-2: #ece7dd;
  --ink: #1c1a17;
  --ink-soft: #4d473e;
  --muted: #8b8478;
  --line: rgba(28, 26, 23, 0.14);
  --accent: #a06a42;
  --serif: Georgia, "Iowan Old Style", "Palatino Linotype", "Times New Roman", serif;
  --sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", Arial, sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; }

.site-head {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(247, 244, 239, 0.9);
  backdrop-filter: saturate(140%) blur(14px);
  border-bottom: 1px solid var(--line);
}

.site-head .inner {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 26px;
  height: 62px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.wordmark {
  font-family: var(--serif);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.34em;
  text-transform: uppercase;
  text-decoration: none;
}

.site-head nav {
  display: flex;
  gap: 22px;
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.site-head nav a { text-decoration: none; border-bottom: 1px solid transparent; }
.site-head nav a:hover, .site-head nav a[aria-current] { color: var(--ink); border-bottom-color: var(--ink); }

main {
  max-width: 720px;
  margin: 0 auto;
  padding: 68px 26px 90px;
}

h1 {
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(1.9rem, 4.4vw, 2.9rem);
  line-height: 1.15;
  letter-spacing: -0.01em;
  margin: 0 0 14px;
}

.eyebrow {
  font-size: 10.5px;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 22px;
}

.lede {
  color: var(--ink-soft);
  font-size: 17px;
  margin: 0 0 8px;
}

hr {
  border: 0;
  border-top: 1px solid var(--line);
  margin: 38px 0;
}

h2 {
  font-family: var(--serif);
  font-weight: 400;
  font-size: 22px;
  margin: 44px 0 12px;
}

p { margin: 0 0 16px; color: var(--ink-soft); }

ul { color: var(--ink-soft); padding-left: 20px; margin: 0 0 16px; }
li { margin-bottom: 8px; }

strong { color: var(--ink); font-weight: 600; }

.note {
  border-left: 2px solid var(--accent);
  padding: 2px 0 2px 18px;
  margin: 26px 0;
  font-size: 14.5px;
}

footer.site-foot {
  border-top: 1px solid var(--line);
  padding: 30px 26px 44px;
  text-align: center;
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
}

footer.site-foot a { text-decoration: none; margin: 0 10px; }
footer.site-foot a:hover { color: var(--ink); }

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #14120f;
    --paper-2: #1e1b17;
    --ink: #ece7dd;
    --ink-soft: #b6aea2;
    --muted: #8b8478;
    --line: rgba(236, 231, 221, 0.14);
  }
  .site-head { background: rgba(20, 18, 15, 0.9); }
}