/* AI时代文明变迁史 · 站点样式
   设计语言：新闻/文化编辑风 —— 宋体标题 + 暖纸底 + 朱红点缀 + 克制的留白 */

:root {
  --bg: #f6f3ec;
  --bg-elev: #fffdf7;
  --ink: #211e18;
  --ink-soft: #4b463d;
  --muted: #8b8478;
  --accent: #a4392c;      /* 朱红 */
  --accent-deep: #7c271d;
  --gold: #b08a3a;
  --hairline: #e6dfd1;
  --hairline-strong: #d6cdbb;

  --s: #9c2b22;   /* 里程碑 */
  --a: #b4650a;   /* 结构性 */
  --b: #2f5d8a;   /* 局部 */
  --c: #77736b;   /* 线索 */
  --ok: #2f7a4e;  /* 双源印证 */
  --warn: #a87b16;/* 单源待核实 */

  --serif: "Songti SC", "STSong", "Noto Serif SC", "Source Han Serif SC", "SimSun", serif;
  --sans: -apple-system, "SF Pro Text", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent-deep); text-decoration: none; }
a:hover { text-decoration: underline; text-decoration-color: var(--gold); text-underline-offset: 3px; }

/* ---------- 顶栏 masthead ---------- */
.masthead {
  border-bottom: 1px solid var(--hairline);
  background: linear-gradient(180deg, #fbf8f1, #f6f3ec);
}
.masthead-inner {
  max-width: 1080px; margin: 0 auto; padding: 40px 28px 22px; text-align: center;
}
.brand {
  font-family: var(--serif);
  font-size: 34px; font-weight: 700; letter-spacing: .06em;
  color: var(--ink); display: inline-block;
}
.brand:hover { text-decoration: none; }
.brand-sub {
  margin: 10px 0 0; color: var(--muted); font-size: 13.5px; letter-spacing: .16em;
}
.nav {
  max-width: 1080px; margin: 0 auto; padding: 0 28px 14px;
  display: flex; justify-content: center; gap: 34px; flex-wrap: wrap;
}
.nav a {
  color: var(--ink-soft); font-size: 15px; letter-spacing: .1em;
  padding: 4px 2px; border-bottom: 2px solid transparent;
}
.nav a:hover { text-decoration: none; color: var(--accent-deep); }
.nav a.active { color: var(--accent-deep); border-bottom-color: var(--accent); }

/* ---------- 页面容器 ---------- */
.page { max-width: 1080px; margin: 0 auto; padding: 44px 28px 80px; }
.container { max-width: 780px; margin: 0 auto; }

/* ---------- 首页 hero ---------- */
.hero {
  display: grid; grid-template-columns: 1.15fr .85fr; gap: 40px; align-items: center;
  padding: 26px 0 46px; border-bottom: 1px solid var(--hairline); margin-bottom: 44px;
}
.hero-eyebrow {
  font-size: 12.5px; letter-spacing: .24em; color: var(--accent);
  text-transform: uppercase; margin: 0 0 14px;
}
.hero h1 {
  font-family: var(--serif); font-size: 38px; line-height: 1.28;
  margin: 0 0 18px; font-weight: 700;
}
.hero p.lede { color: var(--ink-soft); font-size: 16.5px; margin: 0 0 22px; }
.hero-cta {
  display: inline-flex; align-items: center; gap: 8px;
  background: var(--accent); color: #fff; padding: 11px 22px; border-radius: 3px;
  font-size: 15px; letter-spacing: .04em;
}
.hero-cta:hover { background: var(--accent-deep); text-decoration: none; color: #fff; }
.hero-fig { margin: 0; }
.hero-fig img {
  width: 100%; border: 1px solid var(--hairline-strong); border-radius: 4px;
  box-shadow: 0 10px 30px rgba(60,45,20,.10); display: block;
}
.hero-fig figcaption { margin-top: 10px; font-size: 12.5px; color: var(--muted); text-align: center; }

/* ---------- 统计条 ---------- */
.stats {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px;
  background: var(--hairline); border: 1px solid var(--hairline); border-radius: 6px;
  overflow: hidden; margin-bottom: 44px;
}
.stats > div { background: var(--bg-elev); text-align: center; padding: 20px 12px; }
.stats b { font-family: var(--serif); font-size: 30px; color: var(--accent-deep); display: block; }
.stats span { font-size: 13px; color: var(--muted); letter-spacing: .08em; }

/* ---------- 章节标题 ---------- */
.section-title {
  font-family: var(--serif); font-size: 22px; font-weight: 700; margin: 0 0 6px;
  letter-spacing: .02em;
}
.section-title .rule {
  display: inline-block; width: 34px; height: 3px; background: var(--accent);
  margin-right: 12px; vertical-align: middle; border-radius: 1px;
}
.section-note { color: var(--muted); font-size: 14px; margin: 0 0 22px; }

/* ---------- 事件卡片 ---------- */
.card-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 18px; margin-bottom: 48px;
}
.card {
  background: var(--bg-elev); border: 1px solid var(--hairline); border-radius: 6px;
  overflow: hidden; display: flex; flex-direction: column;
  transition: transform .12s ease, box-shadow .12s ease;
}
.card:hover { transform: translateY(-2px); box-shadow: 0 12px 26px rgba(60,45,20,.10); }
.card-thumb { aspect-ratio: 16/9; background: #ece7db; overflow: hidden; }
.card-thumb img { width: 100%; height: 100%; object-fit: cover; display: block; }
.card-body { padding: 16px 18px 18px; display: flex; flex-direction: column; flex: 1; }
.card-top { display: flex; gap: 8px; margin-bottom: 10px; flex-wrap: wrap; }
.card-title {
  font-family: var(--serif); font-size: 16.5px; line-height: 1.5; font-weight: 700;
  color: var(--ink); margin: 0 0 10px;
}
.card:hover .card-title { color: var(--accent-deep); }
.card-meta { margin-top: auto; font-size: 12.5px; color: var(--muted); }

/* 徽章 */
.badge {
  display: inline-block; padding: 2px 9px; border-radius: 3px;
  font-size: 12px; letter-spacing: .05em; color: #fff; font-weight: 600;
}
.badge.s { background: var(--s); }
.badge.a { background: var(--a); }
.badge.b { background: var(--b); }
.badge.c { background: var(--c); }
.tag {
  display: inline-block; padding: 2px 9px; border-radius: 3px; font-size: 12px;
  border: 1px solid var(--hairline-strong); color: var(--ink-soft); background: #fbfaf5;
}
.tag.ok { color: var(--ok); border-color: #cfe0d4; background: #f2f8f4; }
.tag.warn { color: var(--warn); border-color: #e6d7ad; background: #faf5e6; }
.tag.disputed { color: var(--a); border-color: #e6cfa4; background: #faf2e6; }

/* ---------- 文章排版 ---------- */
.article {
  background: var(--bg-elev); border: 1px solid var(--hairline); border-radius: 6px;
  padding: 40px 48px 48px;
}
.article h1 {
  font-family: var(--serif); font-size: 30px; line-height: 1.3; margin: 0 0 18px;
}
.article h2 {
  font-family: var(--serif); font-size: 21px; margin: 34px 0 14px;
  padding-top: 14px; border-top: 1px solid var(--hairline);
}
.article h3 { font-family: var(--serif); font-size: 17.5px; margin: 26px 0 10px; color: var(--ink); }
.article h4 { font-size: 15.5px; margin: 20px 0 8px; color: var(--ink-soft); }
.article p { margin: 0 0 16px; }
.article strong { color: var(--ink); }
.article ul, .article ol { margin: 0 0 18px; padding-left: 24px; }
.article li { margin: 5px 0; }
.article blockquote {
  margin: 20px 0; padding: 14px 20px; border-left: 3px solid var(--accent);
  background: #faf6ee; color: var(--ink-soft); border-radius: 0 4px 4px 0;
}
.article blockquote p:last-child { margin-bottom: 0; }
.article code {
  background: #f0ebe0; padding: 2px 6px; border-radius: 3px; font-size: 13.5px;
  font-family: "SF Mono", "Menlo", "Consolas", monospace;
}
.article pre {
  background: #26221a; color: #ece6d8; padding: 18px 20px; border-radius: 6px;
  overflow-x: auto; font-size: 13px; line-height: 1.6;
}
.article pre code { background: none; color: inherit; padding: 0; }
.article table {
  width: 100%; border-collapse: collapse; margin: 20px 0; font-size: 14px;
}
.article th, .article td {
  border: 1px solid var(--hairline); padding: 10px 12px; text-align: left; vertical-align: top;
}
.article th { background: #f4efe3; font-weight: 600; }
.article tr:nth-child(even) td { background: #fbfaf5; }
.article hr { border: none; border-top: 1px solid var(--hairline); margin: 30px 0; }
.article img { max-width: 100%; border-radius: 4px; }

/* 文章页头部 meta */
.article-meta {
  display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 22px; align-items: center;
}
.article-meta .date { color: var(--muted); font-size: 13.5px; }

/* 存照画廊 */
.gallery-title { font-family: var(--serif); font-size: 19px; margin: 40px 0 16px; }
.gallery { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 18px; }
.gallery figure { margin: 0; }
.gallery img {
  width: 100%; border: 1px solid var(--hairline-strong); border-radius: 4px; display: block;
}
.gallery figcaption { font-size: 12.5px; color: var(--muted); margin-top: 8px; line-height: 1.5; }

/* 周报导航 */
.week-nav {
  display: flex; justify-content: space-between; gap: 16px; margin-top: 26px;
}
.week-nav a {
  background: var(--bg-elev); border: 1px solid var(--hairline); border-radius: 6px;
  padding: 12px 18px; color: var(--ink-soft); font-size: 14px;
}
.week-nav a:hover { border-color: var(--accent); color: var(--accent-deep); text-decoration: none; }
.week-nav .placeholder { visibility: hidden; }

/* ---------- 页脚 ---------- */
.footer {
  border-top: 1px solid var(--hairline); padding: 34px 28px 44px; text-align: center;
  color: var(--muted); font-size: 13px; line-height: 2;
}
.footer .serif { font-family: var(--serif); color: var(--ink-soft); font-size: 15px; }

/* ---------- 响应式 ---------- */
@media (max-width: 780px) {
  .hero { grid-template-columns: 1fr; }
  .hero-fig { order: -1; }
  .article { padding: 26px 22px 30px; }
  .brand { font-size: 27px; }
  .stats { grid-template-columns: 1fr; }
}