:root {
  --bg: #f5f6f8;
  --card: #ffffff;
  --text: #1f2329;
  --muted: #6b7280;
  --brand: #2563eb;
  --brand-soft: #e8effd;
  --border: #e6e8ec;
  --code-bg: #0d1117;
  --shadow: 0 1px 3px rgba(16, 24, 40, .07), 0 8px 24px rgba(16, 24, 40, .05);
}
[data-theme="dark"] {
  --bg: #0f1115;
  --card: #171a21;
  --text: #e8eaed;
  --muted: #9aa0a6;
  --brand: #5b8cff;
  --brand-soft: #1c2540;
  --border: #2a2f3a;
  --shadow: 0 1px 3px rgba(0, 0, 0, .4);
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: "PingFang SC", "Microsoft YaHei", "Segoe UI", system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  transition: background .25s, color .25s;
}
a { color: inherit; text-decoration: none; }
.wrap { max-width: 1200px; margin: 0 auto; padding: 0 20px; }

.site-header {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--card) 88%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.header-inner { display: flex; align-items: center; gap: 16px; height: 58px; }
.logo { display: flex; align-items: center; gap: 8px; font-size: 17px; font-weight: 700; white-space: nowrap; }
.logo em { font-style: normal; color: var(--brand); }
.logo-icon { font-size: 20px; }
.search-box {
  flex: 1; max-width: 420px; margin-left: auto;
  display: flex; align-items: center; gap: 8px;
  background: var(--bg); border: 1px solid var(--border); border-radius: 10px;
  padding: 0 12px; height: 38px; color: var(--muted);
}
.search-box input {
  flex: 1; border: 0; outline: 0; background: transparent;
  font-size: 14px; color: var(--text); height: 100%;
}
.icon-btn {
  width: 38px; height: 38px; border-radius: 10px; border: 1px solid var(--border);
  background: var(--card); cursor: pointer; font-size: 16px; color: var(--text);
}
.icon-btn:hover { border-color: var(--brand); }

/* ---------- 主题菜单 ---------- */
.theme-wrap { position: relative; }
.theme-menu {
  position: absolute; right: 0; top: 46px; min-width: 208px; z-index: 100;
  background: var(--card); border: 1px solid var(--border); border-radius: 12px;
  box-shadow: var(--shadow); padding: 6px; display: none;
}
.theme-item {
  display: flex; align-items: center; gap: 10px;
  padding: 9px 12px; border-radius: 8px; cursor: pointer; font-size: 13.5px;
}
.theme-item:hover { background: var(--brand-soft); }
.theme-item.active { color: var(--brand); font-weight: 600; }
.theme-item .sw { display: flex; padding-left: 3px; flex-shrink: 0; }
.theme-item .sw i {
  width: 13px; height: 13px; border-radius: 50%; display: block;
  border: 2px solid var(--card); margin-left: -4px;
}
.theme-item .sw i:first-child { margin-left: 0; }
.theme-item .check { margin-left: auto; color: var(--brand); font-weight: 700; }

/* ---------- 首页 ---------- */
.hero { padding: 52px 0 30px; text-align: center; }
.hero h1 { font-size: 32px; margin: 0 0 12px; }
.hero h1 b { color: var(--brand); }
.hero p { color: var(--muted); margin: 0 auto; max-width: 620px; line-height: 1.8; font-size: 15px; }
.hero .stats { display: flex; justify-content: center; gap: 36px; margin-top: 24px; }
.hero .stats b { font-size: 24px; display: block; }
.hero .stats span { color: var(--muted); font-size: 13px; }

.section-head { display: flex; align-items: baseline; justify-content: space-between; margin: 34px 0 16px; }
.section-head h2 { font-size: 20px; margin: 0; }
.section-head a { color: var(--brand); font-size: 14px; }

.cat-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(210px, 1fr)); gap: 14px; }
.cat-card {
  background: var(--card); border: 1px solid var(--border); border-radius: 14px;
  padding: 18px; display: block; transition: transform .15s, box-shadow .15s, border-color .15s;
}
.cat-card:hover { transform: translateY(-3px); box-shadow: var(--shadow); border-color: var(--brand); }
.cat-card .icon { font-size: 26px; }
.cat-card h3 { margin: 10px 0 4px; font-size: 15.5px; }
.cat-card p { margin: 0; color: var(--muted); font-size: 12.5px; line-height: 1.6; }
.cat-card .count { float: right; color: var(--brand); font-size: 12px; font-weight: 600; background: var(--brand-soft); padding: 2px 8px; border-radius: 99px; }

/* ---------- 图表卡片 ---------- */
.chart-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(270px, 1fr)); gap: 16px; padding-bottom: 48px; }
.card {
  background: var(--card); border: 1px solid var(--border); border-radius: 14px;
  overflow: hidden; display: flex; flex-direction: column; transition: transform .15s, box-shadow .15s, border-color .15s;
  position: relative;
}
.card:hover { transform: translateY(-3px); box-shadow: var(--shadow); border-color: var(--brand); }
.card .thumb { height: 190px; cursor: pointer; }
.card .thumb > div { width: 100%; height: 100%; }
.card-body { padding: 12px 14px 14px; border-top: 1px solid var(--border); }
.card-body h3 { margin: 0 0 5px; font-size: 15px; }
.card-body p { margin: 0 0 10px; color: var(--muted); font-size: 12.5px; line-height: 1.55;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.tags { display: flex; flex-wrap: wrap; gap: 6px; }
.tags span { font-size: 11.5px; color: var(--brand); background: var(--brand-soft); border-radius: 6px; padding: 2px 8px; }
.fav-flag { position: absolute; top: 10px; right: 10px; z-index: 2; font-size: 15px;
  filter: drop-shadow(0 1px 2px rgba(0, 0, 0, .35)); }

/* ---------- 收藏 / 最近浏览横滑区（首页） ---------- */
.strip-row { display: flex; gap: 14px; overflow-x: auto; padding: 2px 2px 14px; scrollbar-width: thin; }
.strip-card {
  flex: 0 0 200px; position: relative;
  background: var(--card); border: 1px solid var(--border); border-radius: 12px;
  overflow: hidden; transition: transform .15s, box-shadow .15s, border-color .15s;
}
.strip-card:hover { transform: translateY(-3px); box-shadow: var(--shadow); border-color: var(--brand); }
.strip-card .thumb { height: 120px; }
.strip-card .thumb > div { width: 100%; height: 100%; }
.strip-card p { margin: 0; padding: 8px 12px; font-size: 13px; border-top: 1px solid var(--border);
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

/* ---------- 选型助手 / 场景导航（V2.0） ---------- */
.pick-banner {
  display: inline-flex; align-items: center; gap: 8px;
  margin-top: 26px; padding: 12px 22px;
  background: linear-gradient(135deg, var(--brand), #7c3aed);
  color: #fff; border-radius: 99px; font-size: 14.5px; font-weight: 600;
  box-shadow: 0 6px 18px rgba(37, 99, 235, .28);
  transition: transform .15s, box-shadow .15s;
}
.pick-banner:hover { transform: translateY(-2px); box-shadow: 0 10px 26px rgba(37, 99, 235, .36); }
.pick-head { text-align: center; padding: 26px 0 4px; }
.pick-head h1 { font-size: 26px; margin: 0 0 8px; }
.pick-head p { color: var(--muted); margin: 0; font-size: 14px; }
.pick-crumb { display: flex; flex-wrap: wrap; justify-content: center; align-items: center; gap: 8px; margin: 20px 0; color: var(--muted); font-size: 13px; }
.pick-crumb a { color: var(--brand); cursor: pointer; }
.pick-crumb a:hover { text-decoration: underline; }
.pick-crumb span { opacity: .6; }
.pick-q { text-align: center; margin: 26px 0 22px; }
.pick-q h2 { font-size: 20px; margin: 0 0 8px; }
.pick-q p { color: var(--muted); font-size: 13.5px; margin: 0; }
.pick-opts {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(225px, 1fr)); gap: 14px;
  max-width: 940px; margin: 0 auto 56px;
}
.pick-opt {
  text-align: left; font-family: inherit;
  background: var(--card); border: 1px solid var(--border); border-radius: 14px;
  padding: 16px 18px; cursor: pointer; color: var(--text);
  transition: transform .15s, box-shadow .15s, border-color .15s;
}
.pick-opt:hover { transform: translateY(-3px); box-shadow: var(--shadow); border-color: var(--brand); }
.pick-opt .icon { font-size: 21px; margin-right: 8px; }
.pick-opt b { font-size: 15px; }
.pick-opt p { margin: 7px 0 0; color: var(--muted); font-size: 12.5px; line-height: 1.6; }
.pick-note {
  max-width: 860px; margin: 4px auto 0;
  background: var(--brand-soft); border: 1px solid var(--brand); border-radius: 12px;
  padding: 12px 16px; font-size: 13.5px; line-height: 1.7;
}
.pick-actions { display: flex; justify-content: center; gap: 10px; margin: 8px 0 56px; }

/* ---------- 详情页 ---------- */
.crumb { padding: 20px 0 0; color: var(--muted); font-size: 13.5px; }
.crumb a:hover { color: var(--brand); }
.detail-head { margin: 14px 0 6px; display: flex; flex-wrap: wrap; align-items: center; gap: 10px 14px; }
.detail-head h1 { font-size: 24px; margin: 0; }
.meta { color: var(--muted); font-size: 13px; display: flex; align-items: center; gap: 14px; flex-wrap: wrap; }
.difficulty { color: #f59e0b; letter-spacing: 2px; }
.detail-desc { color: var(--muted); line-height: 1.8; font-size: 14.5px; max-width: 860px; margin: 4px 0 0; }
.detail-desc b { color: var(--text); }
.fav-btn {
  background: transparent; border: 0; cursor: pointer; font-size: 26px; line-height: 1;
  color: var(--muted); padding: 2px 4px; transition: color .15s, transform .15s;
}
.fav-btn:hover { transform: scale(1.15); }
.fav-btn.active { color: #f59e0b; }

.share-banner {
  display: flex; align-items: center; flex-wrap: wrap; gap: 10px;
  background: var(--brand-soft); border: 1px solid var(--brand); border-radius: 12px;
  padding: 10px 16px; margin: 14px 0 0; font-size: 13.5px;
}
.share-banner span { flex: 1; min-width: 200px; }
.share-banner.warn { border-color: #f59e0b; background: rgba(245, 158, 11, .1); }

.chart-panel {
  background: var(--card); border: 1px solid var(--border); border-radius: 14px;
  margin: 18px 0; padding: 10px; position: relative;
}
#detail-chart { width: 100%; height: 460px; }
.chart-panel-actions { position: absolute; top: 14px; right: 16px; z-index: 3;
  display: flex; align-items: center; gap: 8px; }
.chart-panel-actions .btn { padding: 4px 10px; font-size: 12.5px; }
.chart-panel-actions .panel-tip { position: static; }
.btn.flash-ok { color: #16a34a; border-color: #16a34a; }
.btn.flash-err { color: #ef4444; border-color: #ef4444; }
.panel-tip { position: absolute; top: 16px; right: 18px; color: var(--muted); font-size: 12px; }

.code-panel { background: var(--card); border: 1px solid var(--border); border-radius: 14px; margin: 0 0 48px; overflow: hidden; }
.code-toolbar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 10px 16px; border-bottom: 1px solid var(--border); font-size: 13.5px;
}
.code-toolbar b { color: var(--muted); font-weight: 600; }
.btn {
  border: 1px solid var(--brand); color: var(--brand); background: transparent;
  border-radius: 8px; padding: 6px 14px; font-size: 13px; cursor: pointer;
}
.btn:hover { background: var(--brand); color: #fff; }
.btn.ghost { border-color: var(--border); color: var(--muted); }
.btn.ghost:hover { color: var(--text); border-color: var(--muted); background: transparent; }
.btn.active { background: var(--brand); color: #fff; }
.code-toolbar > div { display: flex; flex-wrap: wrap; gap: 8px; }

#code-editor {
  display: block; width: 100%; min-height: 380px; border: 0; outline: none; resize: vertical;
  background: var(--code-bg); color: #c9d1d9; caret-color: #fff;
  font-family: Consolas, "JetBrains Mono", Menlo, monospace; font-size: 13px; line-height: 1.65;
  padding: 18px 20px; tab-size: 2;
}
#monaco-host { height: 420px; background: var(--code-bg); }
#editor-status, #data-status { padding: 10px 16px; font-size: 13px; border-top: 1px solid var(--border); }
#editor-status.ok, #data-status.ok { color: #16a34a; background: rgba(22, 163, 74, .08); }
#editor-status.err, #data-status.err { color: #ef4444; background: rgba(239, 68, 68, .08); }

/* ---------- 数据面板 ---------- */
.data-panel {
  background: var(--card); border: 1px solid var(--border); border-radius: 14px;
  margin: 0 0 14px; overflow: hidden;
}
.data-panel-head {
  display: flex; align-items: center; gap: 12px;
  padding: 11px 16px; font-size: 13.5px;
}
.data-panel-head b { color: var(--muted); font-weight: 600; }
.data-panel-sub { color: var(--muted); font-size: 12px; flex: 1; }
.data-panel-head .btn { margin-left: auto; flex-shrink: 0; }
#data-input {
  display: block; width: 100%; min-height: 120px; border: 0; outline: none; resize: vertical;
  background: var(--bg); color: var(--text);
  font-family: Consolas, "JetBrains Mono", Menlo, monospace; font-size: 12.5px; line-height: 1.6;
  padding: 12px 16px; border-top: 1px solid var(--border); border-bottom: 1px solid var(--border);
}
.data-actions { display: flex; align-items: center; flex-wrap: wrap; gap: 8px; padding: 10px 16px 4px; }
.data-binding { color: var(--muted); font-size: 12px; line-height: 1.6; }
#data-status { border-top: 0; }
pre.code {
  margin: 0; padding: 18px 20px; background: var(--code-bg); color: #c9d1d9;
  font-family: Consolas, "JetBrains Mono", Menlo, monospace; font-size: 13px; line-height: 1.65;
  overflow: auto; max-height: 520px;
}
pre.code .k { color: #ff7b72; }
pre.code .s { color: #a5d6ff; }
pre.code .n { color: #79c0ff; }
pre.code .c { color: #8b949e; font-style: italic; }
pre.code .p { color: #ffa657; }
.usage-note { padding: 12px 16px; color: var(--muted); font-size: 12.5px; border-top: 1px solid var(--border); line-height: 1.7; }
.usage-note code { background: var(--bg); padding: 1px 6px; border-radius: 5px; font-size: 12px; }

.rel-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(270px, 1fr)); gap: 16px; padding-bottom: 48px; }

.empty { text-align: center; padding: 90px 0 120px; color: var(--muted); }
.empty .icon { font-size: 44px; display: block; margin-bottom: 14px; }

.site-footer { border-top: 1px solid var(--border); padding: 22px 0 30px; color: var(--muted); font-size: 12.5px; text-align: center; }

@media (max-width: 640px) {
  .wrap { padding: 0 14px; }
  .header-inner { flex-wrap: wrap; height: auto; padding: 10px 0; gap: 10px; }
  .search-box { order: 3; max-width: 100%; flex-basis: 100%; }
  .hero { padding: 34px 0 22px; }
  .hero h1 { font-size: 22px; }
  .hero .stats { gap: 22px; margin-top: 18px; }
  .section-head { margin: 26px 0 12px; flex-wrap: wrap; gap: 6px; }

  .detail-head h1 { font-size: 20px; }
  .detail-desc { font-size: 13.5px; }
  .chart-panel { padding: 6px; }
  .chart-panel-actions { top: 10px; right: 12px; }
  .chart-panel-actions .panel-tip { display: none; }
  #detail-chart { height: 340px; }
  .share-banner { font-size: 13px; }
  .share-banner .btn { flex: 1 1 auto; }

  .code-toolbar { flex-wrap: wrap; gap: 8px; padding: 10px 12px; }
  .code-toolbar b { flex: 1 1 100%; }
  .code-toolbar > div { flex-wrap: wrap; gap: 6px; }
  .btn { padding: 5px 10px; font-size: 12.5px; }
  pre.code { padding: 12px 14px; font-size: 12px; max-height: 420px; }
  #code-editor { min-height: 320px; font-size: 12.5px; padding: 12px 14px; }
  #monaco-host { height: 360px; }
  .usage-note { padding: 10px 12px; font-size: 12px; }

  .data-panel-head { flex-wrap: wrap; padding: 10px 12px; row-gap: 4px; }
  .data-panel-sub { flex-basis: 100%; order: 3; }
  .data-panel-head .btn { margin-left: auto; }
  #data-input { padding: 10px 12px; }

  .strip-card { flex-basis: 168px; }
  .empty { padding: 70px 0 90px; }

  .pick-banner { font-size: 13px; padding: 10px 16px; margin-top: 20px; }
  .pick-head h1 { font-size: 21px; }
  .pick-opts { grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 10px; margin-bottom: 40px; }
  .pick-opt { padding: 13px 14px; }
  .pick-note { font-size: 13px; }
}