/* 知雨的页面：沿用 App 的宣纸与墨色。 */
:root {
  --paper: #f4f2ec;
  --paper-warm: #ebe8e0;
  --ink: #2b2925;
  --ink-soft: #514d45;
  --muted: #847f74;
  --line: #ddd8cc;
  --gold: #9e8252;
  --serif: "Songti SC", "Noto Serif SC", "Source Han Serif SC", serif;
  --sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
}
@media (prefers-color-scheme: dark) {
  :root {
    --paper: #1f1d1a;
    --paper-warm: #29261f;
    --ink: #ece6da;
    --ink-soft: #c9c2b4;
    --muted: #a49d90;
    --line: #3a362f;
    --gold: #c9ac78;
  }
}
* { 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: 17px;
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; }
a:focus-visible { outline: 2px solid var(--gold); outline-offset: 3px; border-radius: 4px; }
img { display: block; max-width: 100%; height: auto; }
.wrap { max-width: 1040px; margin: 0 auto; padding: 0 28px; }
.narrow { max-width: 720px; }

.bar .wrap { display: flex; align-items: center; justify-content: space-between; height: 64px; font-size: 15px; }
.crumbs { display: flex; gap: 10px; align-items: center; }
.crumbs a { text-decoration: none; color: var(--muted); }
.crumbs a:hover { color: var(--ink); }
.crumbs .here { color: var(--ink); font-weight: 600; }
.bar nav { display: flex; gap: 22px; }
.bar nav a { text-decoration: none; color: var(--muted); }
.bar nav a[aria-current="page"], .bar nav a:hover { color: var(--ink); }

/* —— 知雨介绍 —— */
.intro { padding: 56px 0 24px; text-align: center; }
.intro img.icon { width: 88px; height: 88px; border-radius: 22px; margin: 0 auto 22px; }
.intro h1 { margin: 0; font-family: var(--serif); font-weight: 600; font-size: clamp(44px, 7vw, 72px); letter-spacing: 0.12em; line-height: 1.2; }
.intro .tagline { margin: 14px 0 0; font-family: var(--serif); font-size: 22px; color: var(--ink-soft); letter-spacing: 0.06em; }
.intro .status { margin: 26px auto 0; display: inline-block; padding: 6px 16px; border: 1px solid var(--line); border-radius: 999px; font-size: 14px; color: var(--muted); }

.gallery { display: flex; justify-content: center; gap: 22px; padding: 40px 0 72px; }
.gallery figure { margin: 0; width: min(250px, 30%); }
.gallery img { border-radius: 26px; border: 1px solid var(--line); box-shadow: 0 30px 50px -30px rgba(43, 41, 37, 0.45); }
.gallery figure:nth-child(2) { transform: translateY(-30px); }
.gallery figcaption { margin-top: 14px; text-align: center; font-size: 14px; color: var(--muted); }

.features { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0 56px; padding-bottom: 64px; }
.features div { padding: 22px 0; border-top: 1px solid var(--line); }
.features h2 { margin: 0 0 4px; font-family: var(--serif); font-size: 21px; font-weight: 600; }
.features p { margin: 0; color: var(--ink-soft); font-size: 16px; }

.note { padding: 28px 32px; margin-bottom: 72px; background: var(--paper-warm); border-radius: 20px; color: var(--ink-soft); font-size: 15px; }
.note p { margin: 0; }
.note p + p { margin-top: 8px; }

/* —— 文档页（隐私政策、会员协议、技术支持） —— */
.doc { padding: 40px 0 72px; }
.doc h1 { margin: 0; font-family: var(--serif); font-size: 40px; font-weight: 600; letter-spacing: 0.04em; }
.doc .meta { margin: 10px 0 0; color: var(--muted); font-size: 14px; }
.doc .toc { margin: 32px 0 8px; padding: 18px 24px; border: 1px solid var(--line); border-radius: 16px; font-size: 15px; }
.doc .toc ul { margin: 0; padding: 0; list-style: none; display: flex; flex-wrap: wrap; gap: 6px 20px; }
.doc .toc a { text-decoration: none; border-bottom: 1px solid var(--line); }
.doc h2 { margin: 44px 0 6px; font-family: var(--serif); font-size: 26px; font-weight: 600; }
.doc h3 { margin: 26px 0 4px; font-size: 17px; font-weight: 600; }
.doc p { margin: 0; color: var(--ink-soft); }
.doc p + p, .doc p + .list, .doc .list + p { margin-top: 8px; }
.doc .list { margin: 0; padding-left: 1.4em; color: var(--ink-soft); }
.doc .list li + li { margin-top: 4px; }
.doc .list .list { margin-top: 4px; list-style: disc; }
.doc .mail {
  display: inline-flex; align-items: center; gap: 10px; margin-top: 10px;
  padding: 10px 20px; border-radius: 999px; background: var(--ink); color: var(--paper);
  text-decoration: none; font-size: 16px;
}
.doc dl { margin: 0; }
.doc dt { margin-top: 24px; font-weight: 600; }
.doc dd { margin: 4px 0 0; color: var(--ink-soft); }

footer { padding: 40px 0 56px; border-top: 1px solid var(--line); color: var(--muted); font-size: 14px; }
footer .wrap { display: flex; flex-wrap: wrap; gap: 8px 24px; }
footer a { text-decoration: none; }
footer a:hover { color: var(--ink); }

@media (max-width: 720px) {
  .gallery { gap: 10px; }
  .gallery figure { width: 32%; }
  .gallery img { border-radius: 14px; }
  .gallery figure:nth-child(2) { transform: translateY(-16px); }
  .features { grid-template-columns: minmax(0, 1fr); }
  .bar nav { gap: 14px; }
}
@media (max-width: 480px) {
  .wrap { padding: 0 18px; }
  .crumbs .from { display: none; }
}