:root {
  --bg: #fcfbf9;
  --card: #ffffff;
  --ink: #26221f;
  --muted: #807a72;
  --line: #ece8e1;
  --accent: #8a6240;
  --accent-soft: #f3ece4;
  --max: 860px;
  --shadow: 0 1px 2px rgba(40,30,20,.04), 0 8px 24px rgba(40,30,20,.05);
}
* { box-sizing: border-box; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif; line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* 导航 */
.nav {
  display: flex; align-items: center; justify-content: space-between;
  max-width: var(--max); margin: 0 auto; padding: 20px 28px;
  position: sticky; top: 0; z-index: 10;
  background: rgba(252,251,249,.82); backdrop-filter: blur(10px);
  border-bottom: 1px solid transparent;
}
.brand { font-weight: 700; letter-spacing: .2px; font-size: 1.05rem; }
.nav nav a { color: var(--muted); font-size: .92rem; margin-left: 22px; }
.nav nav a:hover { color: var(--accent); text-decoration: none; }

main { max-width: var(--max); margin: 0 auto; padding: 0 28px; }

/* Hero */
.hero { padding: 72px 0 40px; }
.hero h1 {
  font-family: Georgia, "Songti SC", "Noto Serif SC", serif;
  font-size: clamp(1.9rem, 4.5vw, 2.8rem); line-height: 1.2; margin: 0 0 18px;
  letter-spacing: -.5px;
}
.lead { color: var(--muted); font-size: 1.08rem; max-width: 660px; }

/* 文章列表 */
.list { display: grid; gap: 16px; padding-bottom: 72px; }
.card {
  display: block; background: var(--card); border: 1px solid var(--line);
  border-radius: 16px; padding: 24px 26px; color: var(--ink);
  box-shadow: var(--shadow); transition: transform .18s ease, border-color .18s ease, box-shadow .18s ease;
}
.card:hover {
  border-color: var(--accent); text-decoration: none;
  transform: translateY(-2px);
  box-shadow: 0 2px 4px rgba(40,30,20,.05), 0 14px 34px rgba(40,30,20,.08);
}
.card .date {
  font-size: .8rem; color: var(--accent); font-weight: 600;
  letter-spacing: .4px; text-transform: uppercase;
}
.card h3 { margin: 8px 0 10px; font-size: 1.25rem; line-height: 1.4; }
.card p { margin: 0; color: var(--muted); font-size: .95rem; }
.card .more {
  display: inline-block; margin-top: 14px; color: var(--accent);
  font-weight: 600; font-size: .9rem;
}
.card:hover .more { text-decoration: underline; }
.empty { color: var(--muted); }

/* 语言切换（中英双语文章/索引） */
.lang-toggle { display: inline-flex; margin-left: 16px; }
.lang-toggle button {
  font: inherit; font-size: .82rem; line-height: 1; cursor: pointer;
  border: 1px solid var(--line); background: #fff; color: var(--muted);
  padding: 6px 12px; transition: background .15s ease, color .15s ease, border-color .15s ease;
}
.lang-toggle button:first-child { border-radius: 999px 0 0 999px; }
.lang-toggle button:last-child { border-radius: 0 999px 999px 0; border-left: none; }
.lang-toggle button:hover { color: var(--accent); }
.lang-toggle button.active { background: var(--accent); color: #fff; border-color: var(--accent); }
.art-en { max-width: 100%; }
.art-en img { max-width: 100%; height: auto; display: block; margin: 24px auto; border-radius: 12px; }

/* 文章页 */
.article { max-width: 720px; margin: 0 auto; padding: 48px 28px 72px; }
.article img {
  max-width: 100%; height: auto; display: block; margin: 24px auto;
  border-radius: 12px;
}
.article section, .article div { max-width: 100% !important; box-sizing: border-box; }
.article h1 {
  font-family: Georgia, "Songti SC", "Noto Serif SC", serif;
  font-size: clamp(1.7rem, 4.5vw, 2.3rem); line-height: 1.3; margin: 0 0 .6em;
  letter-spacing: -.5px;
}
.article h2 {
  font-family: Georgia, "Songti SC", "Noto Serif SC", serif;
  font-size: 1.45rem; margin: 2em 0 .6em; padding-bottom: .3em;
  border-bottom: 1px solid var(--line);
}
.article h3 { margin: 1.6em 0 .5em; font-size: 1.15rem; }
.article p { margin: 1em 0; }
.article ul { padding-left: 1.25em; margin: 1em 0; }
.article li { margin: .55em 0; padding-left: .2em; }
.article em { font-style: italic; color: var(--accent); }
.article .muted { color: var(--muted); font-size: .9rem; }
.article.about { max-width: 720px; }

/* 页脚 */
.foot {
  max-width: var(--max); margin: 0 auto; padding: 28px 28px 56px;
  color: var(--muted); font-size: .85rem; border-top: 1px solid var(--line);
}

@media (max-width: 600px) {
  .hero { padding: 48px 0 28px; }
  .nav { padding: 16px 20px; }
  main { padding: 0 20px; }
  .part { flex-direction: column; gap: 4px; }
}

/* ===== 文章专业排版（EN 版专用语义样式） ===== */
.kicker {
  font-size: .76rem; letter-spacing: 2.5px; text-transform: uppercase;
  color: var(--accent); font-weight: 700; margin: 0 0 12px;
}
h1.art-title {
  font-family: Georgia, "Songti SC", "Noto Serif SC", serif;
  font-size: clamp(1.8rem, 4.5vw, 2.5rem); line-height: 1.28; margin: 0 0 14px;
  letter-spacing: -.5px;
}
.lead { font-size: 1.12rem; color: var(--muted); line-height: 1.75; margin: 0 0 10px; }
.tags { font-size: .82rem; letter-spacing: .5px; color: var(--muted); margin: 0 0 6px; }

.part {
  display: flex; align-items: baseline; gap: 14px;
  margin: 2.8em 0 .5em; padding-top: 1.7em; border-top: 2px solid var(--ink);
}
.part .part-no { font-size: 1.05rem; font-weight: 800; color: var(--accent); letter-spacing: 1px; }
.part h2 { margin: 0; font-family: Georgia, "Songti SC", "Noto Serif SC", serif; font-size: 1.5rem; line-height: 1.3; }
.part-label {
  font-size: .74rem; letter-spacing: 2px; text-transform: uppercase;
  color: var(--muted); margin: 0 0 1.3em;
}
.label {
  font-size: .76rem; letter-spacing: 2px; text-transform: uppercase;
  color: var(--accent); font-weight: 700; margin: 2em 0 .4em;
}
.cap { font-size: .85rem; color: var(--muted); text-align: center; margin: 8px 0 30px; }
.note {
  font-size: .88rem; color: var(--muted); background: var(--accent-soft);
  border-left: 3px solid var(--accent); padding: 12px 16px;
  border-radius: 0 8px 8px 0; margin: 1.3em 0; line-height: 1.7;
}
.pull {
  font-family: Georgia, "Songti SC", "Noto Serif SC", serif;
  font-size: 1.28rem; line-height: 1.5; text-align: center; color: var(--ink);
  margin: 1.9em auto; max-width: 540px;
}
.callout {
  background: #fff; border: 1px solid var(--line); border-left: 4px solid var(--accent);
  border-radius: 12px; padding: 18px 22px; margin: 1.6em 0; box-shadow: var(--shadow);
}
.callout h3 { margin: 0 0 10px; font-size: 1.05rem; }
.observe {
  background: #f7f2ea; border: 1px solid var(--line); border-radius: 12px;
  padding: 16px 20px; margin: 1.3em 0; font-size: .95rem; line-height: 1.75;
}
.observe .label { margin-top: 0; }
.co-h {
  display: flex; align-items: baseline; gap: 10px; flex-wrap: wrap;
  margin: 2.2em 0 .3em; font-size: 1.2rem;
}
.co-h .co-no { color: var(--accent); font-weight: 800; font-family: Georgia, serif; font-size: 1.1rem; }
.co-h em { color: var(--muted); font-weight: 400; font-style: normal; font-size: .95rem; }
.endtag { text-align: center; letter-spacing: 4px; color: var(--muted); margin: 2.4em 0; font-size: .85rem; }
.disclaimer {
  background: var(--accent-soft); border: 1px solid var(--line); border-radius: 14px;
  padding: 20px 24px; margin: 2.2em 0; font-size: .92rem; line-height: 1.75;
}
.refs { font-size: .88rem; color: var(--muted); padding-left: 1.4em; margin: 1em 0; line-height: 1.7; }
.refs li { margin: .5em 0; }
.endmark { text-align: center; color: var(--muted); letter-spacing: 3px; margin: 3em 0 1em; font-size: .85rem; }

/* ===== 数据表格 ===== */
.tbl-wrap {
  overflow-x: auto; margin: 1.5em 0; border-radius: 12px;
  border: 1px solid var(--line); box-shadow: var(--shadow); background: #fff;
}
.fb-table { width: 100%; border-collapse: collapse; font-size: .9rem; min-width: 520px; }
.fb-table caption { text-align: left; font-weight: 700; padding: 14px 16px 8px; font-size: .95rem; }
.fb-table th, .fb-table td { border-bottom: 1px solid var(--line); padding: 10px 12px; text-align: left; vertical-align: top; }
.fb-table thead th {
  background: var(--accent-soft); font-size: .76rem; letter-spacing: 1px;
  text-transform: uppercase; color: var(--accent); white-space: nowrap;
}
.fb-table tbody th { font-weight: 600; }
.fb-table tbody tr:nth-child(even) { background: #faf8f4; }
.fb-table tr:last-child td, .fb-table tr:last-child th { border-bottom: none; }
.lvl { display: inline-block; padding: 2px 10px; border-radius: 999px; font-size: .78rem; font-weight: 600; white-space: nowrap; }
.lv-lead { background: #2e7d52; color: #fff; }
.lv-est { background: #dcedc8; color: #33691e; }
.lv-dev { background: #fdf0d8; color: #9a6b12; }
.lv-start { background: #e6f0fb; color: #2f6db0; }

/* ===== 数据统计卡片 ===== */
.stat-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 14px; margin: 1.5em 0; }
.stat { background: #fff; border: 1px solid var(--line); border-radius: 14px; padding: 18px; text-align: center; box-shadow: var(--shadow); }
.stat b { display: block; font-size: 1.3rem; color: var(--accent); font-family: Georgia, serif; line-height: 1.3; }
.stat span { font-size: .84rem; color: var(--muted); }

/* ===== Trust Framework 页 ===== */
.fw-dims { display: flex; flex-wrap: wrap; gap: 8px; margin: 14px 0 18px; }
.fw-dim { border: 1px solid var(--line); background: #fff; border-radius: 999px; padding: 6px 14px; font-size: .88rem; font-weight: 600; color: var(--ink); }
.fw-h4 { font-size: 1.05rem; margin: 1.6em 0 .4em; }
.fw-list { margin: .4em 0 .8em; padding-left: 1.3em; }
.fw-list li { margin: .4em 0; }
.fw-note { background: var(--accent-soft); border-left: 3px solid var(--accent); padding: 12px 16px; border-radius: 0 8px 8px 0; margin: 1em 0; font-size: .92rem; line-height: 1.7; }
.fw-table { border: 1px solid var(--line); border-radius: 12px; overflow: hidden; margin: 10px 0 14px; background: #fff; }
.fw-row { display: flex; justify-content: space-between; align-items: center; gap: 12px; padding: 10px 16px; border-top: 1px solid var(--line); }
.fw-row:first-child { border-top: none; }
.fw-dim-name { font-weight: 600; font-size: .92rem; }
.fw-badge { display: inline-block; padding: 2px 12px; border-radius: 999px; font-size: .8rem; font-weight: 600; white-space: nowrap; }
.fw-badge.leading { background: #2e7d52; color: #fff; }
.fw-badge.established { background: #dcedc8; color: #33691e; }
.fw-badge.developing { background: #fdf0d8; color: #9a6b12; }
.fw-badge.starting { background: #e6f0fb; color: #2f6db0; }
.fw-notes p { margin: .6em 0; font-size: .92rem; line-height: 1.7; }
.fw-defs { list-style: none; padding: 0; margin: 8px 0 0; }
.fw-defs li { display: flex; align-items: center; gap: 10px; margin: .5em 0; font-size: .92rem; line-height: 1.6; }
.fw-defs .fw-badge { flex: 0 0 auto; }