:root {
  --primary: #1e80ff;
  --primary-dark: #0a6ce0;
  --primary-light: #e8f2ff;
  --text: #2c3e50;
  --text-light: #6b7a8c;
  --border: #e4e9f0;
  --bg: #f7f9fb;
  --card: #ffffff;
  --success: #10b981;
  --danger: #ef4444;
  --radius: 8px;
  --mono: 'JetBrains Mono', Consolas, 'Courier New', monospace;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  color: var(--text);
  background: var(--bg);
  font-size: 14px;
  line-height: 1.65;
}

a { color: var(--primary); text-decoration: none; }
a:hover { color: var(--primary-dark); }

/* ===== 顶栏 ===== */
.topbar {
  background: #fff;
  border-bottom: 1px solid var(--border);
  position: sticky; top: 0; z-index: 100;
}
.topbar-inner {
  max-width: 1400px; margin: 0 auto; padding: 0 20px;
  height: 56px; display: flex; align-items: center; gap: 28px;
}
.brand {
  font-size: 17px; font-weight: 700; color: var(--text);
  display: flex; align-items: center; gap: 8px;
}
.brand:hover { color: var(--primary); }
.brand .logo {
  width: 28px; height: 28px; border-radius: 6px;
  background: linear-gradient(135deg, var(--primary), #7c3aed);
  color: #fff; display: inline-flex; align-items: center; justify-content: center;
  font-size: 14px; font-weight: 700;
}
.topbar nav { display: flex; gap: 4px; align-items: center; flex: 1; }
.topbar nav a {
  padding: 6px 14px; border-radius: 6px; color: var(--text-light); font-weight: 500;
}
.topbar nav a:hover { color: var(--primary); background: var(--primary-light); }
.topbar nav a.active { color: var(--primary); background: var(--primary-light); }
.brand-sub { color: var(--text-light); font-size: 12px; font-family: var(--mono); }

/* ===== 布局 ===== */
.layout {
  max-width: 1400px; margin: 0 auto; padding: 20px;
  display: flex; gap: 24px; align-items: flex-start;
}
.sidebar {
  width: 250px; flex-shrink: 0; position: sticky; top: 76px;
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 12px; max-height: calc(100vh - 96px); overflow-y: auto;
}
.content { flex: 1; min-width: 0; }

.sidebar .group-title {
  font-size: 12px; font-weight: 600; color: var(--text-light);
  padding: 10px 10px 4px; text-transform: uppercase; letter-spacing: .5px;
}
.sidebar a.item {
  display: flex; justify-content: space-between; align-items: center;
  padding: 6px 10px; border-radius: 6px; color: var(--text); font-size: 13px;
}
.sidebar a.item:hover { background: var(--primary-light); color: var(--primary); }
.sidebar a.item.active { background: var(--primary-light); color: var(--primary); font-weight: 600; }
.sidebar a.item .cnt { color: var(--text-light); font-size: 12px; }
.sidebar a.sub {
  display: block; padding: 4px 10px 4px 24px; border-radius: 6px;
  color: var(--text-light); font-size: 12.5px; font-family: var(--mono);
}
.sidebar a.sub:hover { color: var(--primary); }

/* ===== 通用卡片 ===== */
.card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 24px; margin-bottom: 16px;
}
.breadcrumb { color: var(--text-light); font-size: 13px; margin-bottom: 10px; }
.breadcrumb a { color: var(--text-light); }
.breadcrumb a:hover { color: var(--primary); }

h1 { font-size: 24px; margin-bottom: 6px; }
h2 { font-size: 18px; margin-bottom: 12px; }
h3 { font-size: 15px; margin-bottom: 8px; }

.hero {
  background: linear-gradient(135deg, #1e80ff 0%, #7c3aed 100%);
  border-radius: 12px; padding: 48px 40px; color: #fff; margin-bottom: 20px;
}
.hero h1 { font-size: 30px; color: #fff; margin-bottom: 10px; }
.hero p { opacity: .92; font-size: 15px; max-width: 640px; }
.hero .stats { display: flex; gap: 32px; margin-top: 24px; }
.hero .stat b { font-size: 26px; display: block; }
.hero .stat span { font-size: 13px; opacity: .85; }
.hero .actions { margin-top: 24px; display: flex; gap: 12px; }
.hero .actions a {
  padding: 9px 22px; border-radius: 8px; font-weight: 600; font-size: 14px;
  background: #fff; color: var(--primary);
}
.hero .actions a.ghost { background: rgba(255,255,255,.15); color: #fff; border: 1px solid rgba(255,255,255,.4); }

/* ===== 首页分类卡 ===== */
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 14px; }
.grid .cat {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 18px; transition: box-shadow .15s, transform .15s, border-color .15s;
  display: block; color: var(--text);
}
.grid .cat:hover { box-shadow: 0 4px 16px rgba(30,128,255,.12); transform: translateY(-2px); border-color: var(--primary); }
.grid .cat .icon {
  width: 38px; height: 38px; border-radius: 8px; background: var(--primary-light);
  display: flex; align-items: center; justify-content: center; font-size: 18px; margin-bottom: 10px;
}
.grid .cat b { display: block; font-size: 14px; }
.grid .cat span { color: var(--text-light); font-size: 12.5px; }

/* ===== 工具表单 ===== */
.tool-grid { display: grid; grid-template-columns: minmax(320px, 1fr) minmax(320px, 1fr); gap: 16px; }
@media (max-width: 1100px) { .tool-grid { grid-template-columns: 1fr; } }

.field { margin-bottom: 14px; }
.field label { display: flex; align-items: center; gap: 6px; font-weight: 600; font-size: 13px; margin-bottom: 5px; }
.field label .type { font-family: var(--mono); font-size: 11.5px; color: var(--text-light); background: var(--bg); border-radius: 4px; padding: 0 6px; font-weight: 400; }
.field label .req { color: var(--danger); }
.field .hint { font-size: 12px; color: var(--text-light); margin-top: 4px; }
.field input[type=text], .field input[type=number], .field select, .field textarea {
  width: 100%; padding: 8px 10px; border: 1px solid var(--border); border-radius: 6px;
  font-size: 13.5px; font-family: inherit; background: #fff; color: var(--text);
}
.field textarea { font-family: var(--mono); font-size: 12.5px; min-height: 110px; resize: vertical; }
.field input:focus, .field select:focus, .field textarea:focus {
  outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px rgba(30,128,255,.12);
}

.btn {
  display: inline-flex; align-items: center; gap: 6px;
  background: var(--primary); color: #fff; border: none; border-radius: 6px;
  padding: 9px 22px; font-size: 14px; font-weight: 600; cursor: pointer;
  transition: background .15s;
}
.btn:hover { background: var(--primary-dark); }
.btn:disabled { opacity: .55; cursor: not-allowed; }
.btn.secondary { background: var(--bg); color: var(--text); border: 1px solid var(--border); }
.btn.secondary:hover { border-color: var(--primary); color: var(--primary); background: var(--primary-light); }

/* ===== 结果面板 ===== */
.result-panel { border: 1px solid var(--border); border-radius: 6px; min-height: 120px; display: flex; flex-direction: column; }
.result-panel .result-head {
  display: flex; justify-content: space-between; align-items: center;
  padding: 8px 12px; border-bottom: 1px solid var(--border);
  font-size: 12.5px; color: var(--text-light); background: var(--bg);
  border-radius: 6px 6px 0 0;
}
.result-panel .result-body { padding: 12px; flex: 1; overflow: auto; max-height: 520px; }
.result-panel pre {
  font-family: var(--mono); font-size: 12.5px; white-space: pre-wrap; word-break: break-all;
}
.result-empty { color: var(--text-light); font-size: 13px; margin: auto; }
.result-error { color: var(--danger); font-size: 13px; }
.result-panel img { max-width: 100%; border-radius: 6px; border: 1px solid var(--border); background: #fff; }
.result-panel .svg-box { text-align: center; }
.result-panel .svg-box svg { max-width: 100%; height: auto; }

/* ===== 文档页 ===== */
.doc-head { padding-bottom: 14px; border-bottom: 1px solid var(--border); margin-bottom: 4px; }
.doc-head .namespace { font-family: var(--mono); color: var(--text-light); font-size: 12.5px; }
.doc-method {
  padding: 18px 0; border-bottom: 1px solid var(--border);
}
.doc-method:last-child { border-bottom: none; }
.doc-method h3 { font-size: 15px; margin-bottom: 8px; }
.doc-method h3 code {
  font-family: var(--mono); font-size: 13px; background: var(--bg);
  padding: 6px 10px; border-radius: 6px; display: block; white-space: pre-wrap; word-break: break-all;
}
.doc-method .summary { color: var(--text); margin: 8px 0; }
.doc-method .returns { color: var(--text-light); font-size: 13px; margin-top: 8px; }
.doc-method .returns code { color: var(--primary-dark); font-family: var(--mono); font-size: 12.5px; }

table.params { width: 100%; border-collapse: collapse; margin: 10px 0; font-size: 13px; }
table.params th, table.params td { text-align: left; padding: 7px 10px; border: 1px solid var(--border); }
table.params th { background: var(--bg); font-weight: 600; color: var(--text-light); }
table.params td code { font-family: var(--mono); font-size: 12px; color: var(--primary-dark); }

.badge {
  display: inline-block; font-size: 11px; border-radius: 4px; padding: 1px 7px;
  background: var(--primary-light); color: var(--primary); font-weight: 600; margin-left: 6px;
}
.badge.gray { background: var(--bg); color: var(--text-light); }

.try-link {
  display: inline-flex; align-items: center; gap: 4px; margin-top: 8px;
  font-size: 12.5px; font-weight: 600; color: var(--primary);
}
.try-link:hover { text-decoration: underline; }

/* ===== 工具列表 ===== */
.tool-list .cat-block { margin-bottom: 20px; }
.tool-list .cat-block h2 { display: flex; align-items: center; gap: 8px; }
.tool-list .cat-block h2 .cnt { font-size: 12px; color: var(--text-light); font-weight: 400; }
.tool-cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 12px; }
.tool-cards a.tool-card {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 14px 16px; color: var(--text); display: block;
  transition: box-shadow .15s, border-color .15s;
}
.tool-cards a.tool-card:hover { box-shadow: 0 4px 14px rgba(30,128,255,.1); border-color: var(--primary); }
.tool-cards .tool-card b { font-family: var(--mono); font-size: 13.5px; display: block; margin-bottom: 4px; }
.tool-cards .tool-card p { color: var(--text-light); font-size: 12.5px; overflow: hidden; text-overflow: ellipsis; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; }

.loading { color: var(--text-light); padding: 40px; text-align: center; }
.spin {
  display: inline-block; width: 16px; height: 16px; border: 2px solid var(--border);
  border-top-color: var(--primary); border-radius: 50%; animation: spin .7s linear infinite;
  vertical-align: -3px; margin-right: 8px;
}
@keyframes spin { to { transform: rotate(360deg); } }

.search-box { margin-bottom: 16px; }
.search-box input {
  width: 100%; padding: 10px 14px; border: 1px solid var(--border); border-radius: 8px;
  font-size: 14px; background: #fff;
}
.search-box input:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px rgba(30,128,255,.12); }
mark { background: #ffe58f; padding: 0 1px; }

footer {
  text-align: center; color: var(--text-light); font-size: 12.5px;
  padding: 30px 0 40px;
}