/* ============ 设计变量 ============ */
:root {
  --bg: #f7f8fa;
  --panel: #ffffff;
  --panel-2: #fbfcfe;
  --text: #15171c;
  --text-2: #3d434e;
  --muted: #6b7280;
  --faint: #9aa3af;
  --border: #e7e9ee;
  --border-strong: #d7dbe3;
  --accent: #2f6bff;
  --accent-2: #7a5cff;
  --accent-soft: #edf2ff;
  --accent-text: #1d4ed8;
  --code-bg: #f3f5f9;
  --code-text: #313846;
  --quote-bg: #f8fafc;
  --shadow-sm: 0 1px 2px rgba(16, 24, 40, .05);
  --shadow: 0 1px 2px rgba(16, 24, 40, .04), 0 12px 28px -16px rgba(16, 24, 40, .18);
  --radius: 14px;
  --radius-sm: 9px;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", sans-serif;
}

html[data-theme="dark"] {
  --bg: #0b0d11;
  --panel: #12161d;
  --panel-2: #161b23;
  --text: #e8eaee;
  --text-2: #c3c9d4;
  --muted: #98a1b0;
  --faint: #6f7a8a;
  --border: #222833;
  --border-strong: #2e3644;
  --accent: #6d9bff;
  --accent-2: #a68bff;
  --accent-soft: #17233c;
  --accent-text: #9dbdff;
  --code-bg: #1a1f28;
  --code-text: #d6dbe4;
  --quote-bg: #141a22;
  --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 16px 32px -20px rgba(0, 0, 0, .8);
}

* { box-sizing: border-box; }

[hidden] { display: none !important; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 15px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a { color: var(--accent-text); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ============ 顶栏 ============ */
.topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--bg) 78%, transparent);
  backdrop-filter: saturate(1.6) blur(14px);
  -webkit-backdrop-filter: saturate(1.6) blur(14px);
  border-bottom: 1px solid var(--border);
}

.topbar-inner {
  max-width: 1180px;
  margin: 0 auto;
  height: 56px;
  padding: 0 24px;
  display: flex;
  align-items: center;
  gap: 16px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-weight: 650;
  color: var(--text);
  font-size: 14.5px;
  letter-spacing: .2px;
  white-space: nowrap;
}
.brand:hover { text-decoration: none; color: var(--accent-text); }

.brand-dot {
  width: 9px; height: 9px; border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  box-shadow: 0 0 0 3px var(--accent-soft);
}

.crumbs {
  display: flex;
  align-items: center;
  gap: 8px;
  min-width: 0;
  font-size: 13px;
  color: var(--muted);
  overflow: hidden;
}
.crumbs a { color: var(--muted); white-space: nowrap; }
.crumbs a:hover { color: var(--accent-text); text-decoration: none; }
.crumbs > * + *::before {
  content: "/";
  margin-right: 8px;
  color: var(--faint);
}
.crumb-cur {
  color: var(--text-2);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 42vw;
}

.topbar-actions { margin-left: auto; display: flex; gap: 8px; }

.icon-btn {
  width: 34px; height: 34px;
  display: grid; place-items: center;
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--text-2);
  border-radius: 10px;
  cursor: pointer;
  font-size: 15px;
  transition: .16s;
}
.icon-btn:hover { border-color: var(--border-strong); color: var(--accent-text); }

/* ============ 首页 Hero ============ */
.hero {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--border);
  background:
    radial-gradient(900px 380px at 12% -10%, color-mix(in srgb, var(--accent) 16%, transparent), transparent 65%),
    radial-gradient(700px 340px at 88% -20%, color-mix(in srgb, var(--accent-2) 14%, transparent), transparent 60%),
    var(--panel);
}

.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: radial-gradient(var(--border-strong) 1px, transparent 1px);
  background-size: 22px 22px;
  opacity: .35;
  mask-image: linear-gradient(to bottom, #000, transparent 70%);
  pointer-events: none;
}

.hero-inner {
  position: relative;
  z-index: 1;
  max-width: 900px;
  margin: 0 auto;
  padding: 72px 24px 56px;
  text-align: center;
}

.badge {
  display: inline-block;
  padding: 5px 12px;
  font-size: 12px;
  font-weight: 550;
  letter-spacing: .4px;
  color: var(--accent-text);
  background: var(--accent-soft);
  border: 1px solid color-mix(in srgb, var(--accent) 22%, transparent);
  border-radius: 999px;
}

.hero h1 {
  margin: 18px 0 10px;
  font-size: clamp(30px, 5vw, 46px);
  line-height: 1.2;
  letter-spacing: -1px;
  font-weight: 750;
  background: linear-gradient(120deg, var(--text) 20%, var(--accent) 60%, var(--accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-sub {
  margin: 0 auto;
  max-width: 620px;
  color: var(--muted);
  font-size: 15px;
}

.search {
  position: relative;
  max-width: 620px;
  margin: 30px auto 0;
  display: flex;
  align-items: center;
}

.search-icon {
  position: absolute;
  left: 16px;
  font-size: 18px;
  color: var(--faint);
  pointer-events: none;
}

#q {
  width: 100%;
  height: 52px;
  padding: 0 62px 0 44px;
  font-size: 15px;
  font-family: inherit;
  color: var(--text);
  background: var(--panel);
  border: 1px solid var(--border-strong);
  border-radius: 13px;
  box-shadow: var(--shadow);
  outline: none;
  transition: .18s;
}
#q::placeholder { color: var(--faint); }
#q:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--accent) 14%, transparent), var(--shadow);
}

.search kbd {
  position: absolute;
  right: 14px;
  padding: 3px 7px;
  font: 500 11px var(--mono);
  color: var(--faint);
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 6px;
}

.stats {
  display: flex;
  justify-content: center;
  gap: 34px;
  margin-top: 34px;
  flex-wrap: wrap;
}
.stats div { display: flex; flex-direction: column; gap: 2px; }
.stats b { font-size: 21px; font-weight: 700; letter-spacing: -.4px; }
.stats span { font-size: 12px; color: var(--muted); }

/* ============ 首页主体 ============ */
.home {
  max-width: 1180px;
  margin: 0 auto;
  padding: 40px 24px 72px;
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(300px, 100%), 1fr));
  gap: 16px;
}

.card {
  display: block;
  padding: 20px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  transition: transform .18s ease, box-shadow .18s ease, border-color .18s;
  color: var(--text);
}
.card:hover {
  text-decoration: none;
  transform: translateY(-3px);
  border-color: color-mix(in srgb, var(--accent) 35%, var(--border));
  box-shadow: var(--shadow);
}

.card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
}
.card-icon {
  font-size: 19px;
  width: 38px; height: 38px;
  display: grid; place-items: center;
  border-radius: 11px;
  background: var(--accent-soft);
}
.card-en {
  font: 600 10.5px var(--mono);
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--faint);
}
.card h3 { margin: 0 0 4px; font-size: 17px; font-weight: 650; letter-spacing: -.2px; }
.card p { margin: 0 0 14px; font-size: 13px; color: var(--muted); line-height: 1.6; }
.card-meta {
  font-size: 12px;
  font-weight: 600;
  color: var(--accent-text);
  padding-top: 12px;
  border-top: 1px dashed var(--border);
}

/* 浏览区 */
.browse-sec { margin-top: 52px; }
.browse-sec h2 {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 16px;
  font-size: 16px;
  font-weight: 650;
  letter-spacing: -.2px;
}
.browse-sec h2 span { font-size: 17px; }
.browse-more {
  margin-left: auto;
  font-size: 12.5px;
  font-weight: 500;
  color: var(--muted);
}
.browse-more:hover { color: var(--accent-text); text-decoration: none; }

.brows {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(240px, 100%), 1fr));
  gap: 8px;
}

.brow {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 11px 14px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-2);
  font-size: 13.5px;
  transition: .14s;
}
.brow:hover {
  text-decoration: none;
  color: var(--accent-text);
  border-color: color-mix(in srgb, var(--accent) 35%, var(--border));
  background: var(--accent-soft);
}
.brow-name { font-weight: 500; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.brow-count { font-size: 12px; color: var(--faint); white-space: nowrap; }

/* 搜索结果 */
.results {
  margin-bottom: 34px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}
.results-head {
  padding: 12px 18px;
  font-size: 12.5px;
  color: var(--muted);
  border-bottom: 1px solid var(--border);
  background: var(--panel-2);
}
.results-list { max-height: 460px; overflow: auto; }
.result {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 10px 18px;
  border-bottom: 1px solid var(--border);
  color: var(--text-2);
  font-size: 13.5px;
}
.result:last-child { border-bottom: 0; }
.result:hover { background: var(--accent-soft); text-decoration: none; color: var(--accent-text); }
.result b { font-weight: 550; }
.result-path { font-size: 11.5px; color: var(--faint); margin-left: auto; font-family: var(--mono); }
.empty { padding: 22px 18px; color: var(--muted); font-size: 13.5px; text-align: center; }

/* ============ 文章页布局 ============ */
.shell {
  max-width: 1240px;
  margin: 0 auto;
  padding: 26px 24px 80px;
  display: grid;
  grid-template-columns: 232px minmax(0, 1fr);
  gap: 34px;
  align-items: start;
}

@media (min-width: 1240px) {
  .shell { grid-template-columns: 232px minmax(0, 1fr) 196px; }
}

/* 侧栏 */
.sidebar {
  position: sticky;
  top: 76px;
  max-height: calc(100vh - 100px);
  overflow-y: auto;
  padding-right: 4px;
  font-size: 13px;
  scrollbar-width: thin;
}
.sidebar::-webkit-scrollbar { width: 6px; }
.sidebar::-webkit-scrollbar-thumb { background: var(--border-strong); border-radius: 3px; }

.sb-home {
  display: block;
  padding: 8px 10px;
  margin-bottom: 12px;
  border-radius: 8px;
  color: var(--text-2);
  font-weight: 550;
  font-size: 13px;
}
.sb-home:hover { background: var(--accent-soft); color: var(--accent-text); text-decoration: none; }
.sb-home.active { background: var(--accent-soft); color: var(--accent-text); }

.sb-domain { margin-bottom: 4px; }
.sb-domain-link {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 7px 10px;
  border-radius: 8px;
  color: var(--text-2);
  font-weight: 600;
  font-size: 13px;
}
.sb-domain-link:hover { background: var(--panel); color: var(--text); text-decoration: none; }
.sb-domain.active > .sb-domain-link { color: var(--accent-text); background: var(--accent-soft); }
.sb-icon { font-size: 13px; }
.sb-count { margin-left: auto; font-size: 11px; color: var(--faint); font-weight: 500; }

.sb-subs { margin: 3px 0 10px 12px; padding-left: 8px; border-left: 1px solid var(--border); }
.sb-sub {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 5px 8px;
  border-radius: 7px;
  color: var(--muted);
  font-size: 12.5px;
}
.sb-sub:hover { color: var(--accent-text); background: var(--panel); text-decoration: none; }
.sb-sub.active { color: var(--accent-text); font-weight: 600; background: var(--accent-soft); }

.sb-items { margin-top: 3px; }
.sb-item {
  display: block;
  padding: 4px 8px 4px 12px;
  border-radius: 6px;
  color: var(--muted);
  font-size: 12.5px;
  line-height: 1.5;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.sb-item:hover { color: var(--accent-text); background: var(--panel); text-decoration: none; }

/* 正文 */
.content { min-width: 0; }

.md {
  max-width: 820px;
  color: var(--text-2);
  font-size: 15.5px;
  line-height: 1.85;
}

.md > *:first-child { margin-top: 0; }

.md h1 {
  margin: 0 0 22px;
  font-size: 30px;
  line-height: 1.3;
  letter-spacing: -.6px;
  font-weight: 720;
  color: var(--text);
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border);
}

.md h2 {
  margin: 42px 0 14px;
  font-size: 21px;
  font-weight: 680;
  letter-spacing: -.3px;
  color: var(--text);
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}

.md h3 { margin: 30px 0 10px; font-size: 17px; font-weight: 650; color: var(--text); }
.md h4 { margin: 24px 0 8px; font-size: 15.5px; font-weight: 650; color: var(--text); }

.md h1, .md h2, .md h3, .md h4 { scroll-margin-top: 76px; }

.md p { margin: 0 0 16px; }
.md ul, .md ol { margin: 0 0 16px; padding-left: 24px; }
.md li { margin: 5px 0; }
.md li > p { margin: 0; }

.md a { border-bottom: 1px solid color-mix(in srgb, var(--accent) 30%, transparent); }
.md a:hover { text-decoration: none; border-bottom-color: var(--accent); }

.md strong { color: var(--text); font-weight: 650; }

.md img {
  max-width: 100%;
  height: auto;
  border-radius: 10px;
  border: 1px solid var(--border);
  margin: 8px 0;
}

.md code {
  font-family: var(--mono);
  font-size: .9em;
  padding: 2px 5px;
  background: var(--code-bg);
  color: var(--code-text);
  border-radius: 5px;
  border: 1px solid var(--border);
}

.md pre {
  margin: 0 0 18px;
  padding: 16px 18px;
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 11px;
  overflow: auto;
  line-height: 1.62;
}
.md pre code {
  padding: 0;
  background: none;
  border: 0;
  font-size: 13px;
  color: var(--code-text);
}

.md blockquote {
  margin: 0 0 18px;
  padding: 12px 18px;
  color: var(--muted);
  background: var(--quote-bg);
  border-left: 3px solid color-mix(in srgb, var(--accent) 55%, var(--border));
  border-radius: 0 9px 9px 0;
}
.md blockquote > :last-child { margin-bottom: 0; }

.md table {
  width: 100%;
  margin: 0 0 20px;
  border-collapse: collapse;
  font-size: 14px;
  display: block;
  overflow-x: auto;
}
.md th, .md td {
  padding: 9px 13px;
  border: 1px solid var(--border);
  text-align: left;
}
.md th { background: var(--panel-2); font-weight: 620; color: var(--text); }
.md tr:nth-child(even) td { background: color-mix(in srgb, var(--panel-2) 60%, transparent); }

.md hr { margin: 34px 0; border: 0; border-top: 1px solid var(--border); }

/* 目录页 */
.page-title { margin: 0 0 6px; font-size: 28px; font-weight: 720; letter-spacing: -.6px; color: var(--text); }
.page-sub { margin: 0 0 26px; color: var(--muted); font-size: 13.5px; }

.chipbar {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 14px 16px;
  margin-bottom: 30px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
}
.chipbar-label {
  flex: none;
  padding-top: 7px;
  font-size: 10.5px;
  font-weight: 650;
  letter-spacing: .9px;
  text-transform: uppercase;
  color: var(--faint);
  white-space: nowrap;
}
.chips { display: flex; flex-wrap: wrap; gap: 7px; }
.chip {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 6px 12px;
  font-size: 12.5px;
  color: var(--text-2);
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 999px;
  transition: .14s;
}
.chip:hover { text-decoration: none; color: var(--accent-text); border-color: var(--accent); background: var(--accent-soft); }
.chip b { font-size: 11px; color: var(--faint); font-weight: 600; }

.item-list { display: flex; flex-direction: column; gap: 2px; max-width: 820px; }
.item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border-radius: 9px;
  color: var(--text-2);
  font-size: 14px;
  border: 1px solid transparent;
  transition: .12s;
}
.item:hover {
  text-decoration: none;
  color: var(--accent-text);
  background: var(--panel);
  border-color: var(--border);
}
.item::before { content: "·"; color: var(--faint); font-weight: 700; }
.item-title { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.item-tag {
  margin-left: auto;
  font: 500 10.5px var(--mono);
  color: var(--faint);
  background: var(--panel-2);
  border: 1px solid var(--border);
  padding: 1px 6px;
  border-radius: 5px;
  white-space: nowrap;
}

/* 右侧目录 */
.toc {
  position: sticky;
  top: 76px;
  max-height: calc(100vh - 100px);
  overflow-y: auto;
  font-size: 12.5px;
  padding-left: 6px;
  border-left: 1px solid var(--border);
}
.toc-title {
  font-size: 11px;
  font-weight: 650;
  letter-spacing: .8px;
  text-transform: uppercase;
  color: var(--faint);
  margin-bottom: 10px;
}
.toc a {
  display: block;
  padding: 4px 0 4px 10px;
  color: var(--muted);
  border-left: 2px solid transparent;
  margin-left: -7px;
  line-height: 1.5;
}
.toc a:hover { color: var(--accent-text); text-decoration: none; }
.toc a.toc-l3 { padding-left: 22px; font-size: 12px; }
.toc a.active { color: var(--accent-text); border-left-color: var(--accent); font-weight: 550; }

/* 上下篇 */
.pager {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  max-width: 820px;
  margin: 48px 0 0;
  padding-top: 24px;
  border-top: 1px solid var(--border);
}
.pager a {
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding: 13px 16px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 11px;
  color: var(--text-2);
  transition: .15s;
}
.pager a:hover { text-decoration: none; border-color: var(--accent); background: var(--accent-soft); }
.pager a span { font-size: 11.5px; color: var(--faint); }
.pager a b { font-size: 13.5px; font-weight: 550; color: var(--text); }
.pager a:hover b { color: var(--accent-text); }
.pager-next { text-align: right; }

.page-foot, .site-foot {
  max-width: 820px;
  margin: 32px 0 0;
  padding-top: 18px;
  border-top: 1px solid var(--border);
  font-size: 12px;
  color: var(--faint);
}

.site-foot {
  max-width: 1180px;
  margin: 0 auto;
  padding: 26px 24px 60px;
  display: flex;
  justify-content: space-between;
  gap: 12px;
  border-top: 1px solid var(--border);
}

/* 阅读进度 */
.progress {
  position: fixed;
  top: 0; left: 0;
  height: 2px;
  width: 0;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  z-index: 60;
  transition: width .1s linear;
}

/* 移动端 */
@media (max-width: 900px) {
  .shell { grid-template-columns: 1fr; padding: 18px 16px 60px; }
  .sidebar { position: static; max-height: none; order: 2; display: none; }
  .sidebar.open { display: block; }
  .toc { display: none; }
  .hero-inner { padding: 46px 18px 40px; }
  .home { padding: 28px 16px 56px; }
  .md { font-size: 15px; }
  .md h1 { font-size: 24px; }
  .md h2 { font-size: 19px; }
  .topbar-inner { padding: 0 16px; }
  .stats { gap: 22px; }
  .site-foot { flex-direction: column; }
  .pager { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; scroll-behavior: auto !important; }
}