/* ===== 基础变量：默认浅色 ===== */
:root {
  --bg: #f5f7fc;
  --bg-soft: #eef1f9;
  --surface: rgba(255, 255, 255, .82);
  --card: #ffffff;
  --text: #1b2233;
  --text-2: #5c6579;
  --text-3: #929aab;
  --border: #e7eaf2;
  --border-strong: #d9deea;
  --primary: #5367ee;
  --primary-2: #8a5cf0;
  --primary-soft: #eef0ff;
  --shadow: 0 6px 24px rgba(31, 45, 92, .07);
  --shadow-hover: 0 14px 34px rgba(50, 63, 130, .14);
  --radius: 16px;
}

[data-theme="dark"] {
  --bg: #0e1118;
  --bg-soft: #161a24;
  --surface: rgba(23, 27, 37, .85);
  --card: #1a1f2b;
  --text: #ecf0f8;
  --text-2: #a8b1c4;
  --text-3: #788298;
  --border: #2a3141;
  --border-strong: #39425a;
  --primary: #7e8dff;
  --primary-2: #ab7bff;
  --primary-soft: #232a49;
  --shadow: 0 6px 24px rgba(0, 0, 0, .25);
  --shadow-hover: 0 14px 34px rgba(0, 0, 0, .42);
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  -webkit-font-smoothing: antialiased;
  transition: background .25s, color .25s;
}
a { color: inherit; text-decoration: none; }
button, input, select, textarea { font: inherit; }

.bg-decor {
  position: fixed; inset: 0; z-index: -1; pointer-events: none;
  background:
    radial-gradient(620px 380px at 12% -8%, rgba(83, 103, 238, .13), transparent 70%),
    radial-gradient(560px 380px at 92% 4%, rgba(168, 92, 240, .11), transparent 70%);
}

/* ===== 顶栏 ===== */
.topbar {
  position: sticky; top: 0; z-index: 20;
  background: var(--surface);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--border);
}
.topbar-inner {
  max-width: 1440px; margin: 0 auto; padding: 14px 28px;
  display: flex; align-items: center; gap: 28px;
}
.brand { display: flex; align-items: center; gap: 12px; flex-shrink: 0; }
.brand-mark {
  width: 42px; height: 42px; border-radius: 13px;
  display: grid; place-items: center;
  background: linear-gradient(135deg, var(--primary), var(--primary-2));
  color: #fff; font-size: 20px; font-weight: 700;
  box-shadow: 0 6px 16px rgba(83, 103, 238, .32);
}
.brand-text { display: flex; flex-direction: column; line-height: 1.35; }
.brand-text strong { font-size: 17px; letter-spacing: .3px; }
.brand-text small { font-size: 11.5px; color: var(--text-3); }

.search-wrap { position: relative; flex: 1; max-width: 520px; margin: 0 auto; }
.search-wrap input {
  width: 100%; height: 44px; padding: 0 74px 0 44px;
  border: 1px solid var(--border); border-radius: 12px;
  background: var(--card); color: var(--text);
  outline: none; transition: border-color .2s, box-shadow .2s;
}
.search-wrap input::placeholder { color: var(--text-3); }
.search-wrap input:focus { border-color: var(--primary); box-shadow: 0 0 0 4px var(--primary-soft); }
.search-icon { position: absolute; left: 15px; top: 13px; width: 18px; height: 18px; color: var(--text-3); }
.kbd {
  position: absolute; right: 14px; top: 11px;
  min-width: 22px; height: 22px; padding: 0 5px;
  display: grid; place-items: center;
  border: 1px solid var(--border-strong); border-radius: 6px;
  font-size: 12px; color: var(--text-3); background: var(--bg-soft);
}
.clear-btn {
  position: absolute; right: 10px; top: 9px;
  width: 26px; height: 26px; border: 0; border-radius: 8px;
  background: var(--bg-soft); color: var(--text-2); cursor: pointer;
  font-size: 18px; line-height: 1;
}
.top-actions { display: flex; align-items: center; gap: 12px; flex-shrink: 0; }
.icon-btn {
  width: 38px; height: 38px; padding: 8px;
  border: 1px solid var(--border); border-radius: 11px;
  background: var(--card); color: var(--text-2); cursor: pointer;
  display: grid; place-items: center; transition: .2s;
}
.icon-btn:hover { color: var(--primary); border-color: var(--primary); }
.icon-btn svg { width: 20px; height: 20px; }
.admin-link {
  padding: 9px 16px; border-radius: 11px;
  background: linear-gradient(135deg, var(--primary), var(--primary-2));
  color: #fff; font-size: 13px; font-weight: 600; white-space: nowrap;
  box-shadow: 0 5px 14px rgba(83, 103, 238, .25); transition: transform .2s, box-shadow .2s;
}
.admin-link:hover { transform: translateY(-1px); box-shadow: 0 8px 20px rgba(83, 103, 238, .35); }

/* ===== 布局 ===== */
.layout {
  max-width: 1440px; margin: 0 auto; padding: 30px 28px 60px;
  display: grid; grid-template-columns: 208px minmax(0, 1fr); gap: 32px;
  align-items: start;
}
.sidebar { position: sticky; top: 100px; }
.side-title {
  font-size: 11px; font-weight: 700; letter-spacing: 1.4px;
  color: var(--text-3); text-transform: uppercase; margin: 4px 0 14px 12px;
}
.cat-nav { display: flex; flex-direction: column; gap: 4px; }
.cat-item {
  display: flex; align-items: center; gap: 10px;
  padding: 10px 12px; border-radius: 10px;
  font-size: 13.5px; color: var(--text-2); cursor: pointer;
  border: 1px solid transparent; background: transparent;
  text-align: left; width: 100%; transition: .18s;
}
.cat-item:hover { background: var(--card); color: var(--text); }
.cat-item.active {
  background: var(--card); color: var(--primary); font-weight: 600;
  border-color: var(--border); box-shadow: var(--shadow);
}
.cat-item .ci { font-size: 15px; width: 20px; text-align: center; }
.cat-item .cn { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.cat-item .cc { font-size: 11px; color: var(--text-3); font-variant-numeric: tabular-nums; }
.side-stat {
  margin-top: 22px; padding: 14px; border-radius: 12px;
  background: var(--card); border: 1px solid var(--border);
  font-size: 12px; color: var(--text-3); line-height: 1.9;
}
.side-stat b { color: var(--text); font-size: 15px; }

/* ===== 内容区 ===== */
.content { min-width: 0; }
.search-info { margin: 0 0 22px; font-size: 13.5px; color: var(--text-2); }
.search-info b { color: var(--primary); }
.section { margin-bottom: 38px; scroll-margin-top: 92px; }
.section-head { display: flex; align-items: center; gap: 10px; margin-bottom: 16px; }
.section-icon {
  width: 30px; height: 30px; border-radius: 9px;
  display: grid; place-items: center; font-size: 15px;
  background: var(--card); border: 1px solid var(--border);
}
.section-title { font-size: 17px; font-weight: 700; margin: 0; }
.section-count { font-size: 12px; color: var(--text-3); }
.section-line { flex: 1; height: 1px; background: var(--border); margin-left: 6px; }

.grid {
  display: grid; gap: 14px;
  grid-template-columns: repeat(auto-fill, minmax(228px, 1fr));
}
.link-card {
  position: relative; display: flex; gap: 12px;
  padding: 16px; min-height: 96px;
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); box-shadow: var(--shadow);
  transition: transform .2s, box-shadow .2s, border-color .2s;
  overflow: hidden;
}
.link-card:hover { transform: translateY(-3px); border-color: var(--primary); box-shadow: var(--shadow-hover); }
.link-card:hover .lc-name { color: var(--primary); }
.lc-icon {
  position: relative; z-index: 1; flex-shrink: 0;
  width: 40px; height: 40px; border-radius: 11px;
  display: grid; place-items: center; overflow: hidden;
  color: #fff; font-size: 17px; font-weight: 700;
  background: linear-gradient(135deg, #6a83f5, #9a6af0);
}
/* 图标渐变色：由 app.js 按名称哈希选择 g0..g7（无内联 style，兼容严格 CSP） */
.lc-icon.g0 { background: linear-gradient(135deg, #6a83f5, #9a6af0); }
.lc-icon.g1 { background: linear-gradient(135deg, #ff8a65, #f4511e); }
.lc-icon.g2 { background: linear-gradient(135deg, #26c6da, #00838f); }
.lc-icon.g3 { background: linear-gradient(135deg, #66bb6a, #2e7d32); }
.lc-icon.g4 { background: linear-gradient(135deg, #ecb53f, #ef6c00); }
.lc-icon.g5 { background: linear-gradient(135deg, #ec6ea8, #ad1457); }
.lc-icon.g6 { background: linear-gradient(135deg, #5c6bc0, #3949ab); }
.lc-icon.g7 { background: linear-gradient(135deg, #29b6f6, #0277bd); }
.lc-letter { position: relative; z-index: 1; }
.lc-img { position: absolute; inset: 0; z-index: 2; width: 100%; height: 100%; object-fit: contain; background: #fff; }
.lc-name { display: block; }
.lc-body { position: relative; z-index: 1; min-width: 0; flex: 1; }
.lc-name {
  font-size: 14px; font-weight: 650; margin: 1px 0 5px;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
  transition: color .2s;
}
.lc-desc {
  font-size: 12px; color: var(--text-3); line-height: 1.5;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical;
  overflow: hidden; min-height: 18px;
}
.lc-arrow {
  position: absolute; right: 13px; top: 15px; z-index: 1;
  font-size: 14px; color: var(--text-3); opacity: 0; transition: .2s;
}
.link-card:hover .lc-arrow { opacity: 1; transform: translate(2px, -2px); }

.empty-state { text-align: center; padding: 90px 20px; color: var(--text-3); }
.empty-emoji { font-size: 42px; margin-bottom: 12px; }
.empty-state h3 { margin: 0 0 8px; font-size: 17px; color: var(--text-2); }
.empty-state p { margin: 0; font-size: 13px; }

.footer {
  text-align: center; padding: 22px; border-top: 1px solid var(--border);
  font-size: 12px; color: var(--text-3);
}

/* ===== 响应式 ===== */
@media (max-width: 980px) {
  .topbar-inner { flex-wrap: wrap; gap: 14px; padding: 12px 18px; }
  .search-wrap { order: 3; flex-basis: 100%; max-width: none; margin: 0; }
  .top-actions { margin-left: auto; }
  .layout { grid-template-columns: 1fr; gap: 18px; padding: 20px 18px 44px; }
  .sidebar { position: static; }
  .side-title, .side-stat { display: none; }
  .cat-nav {
    flex-direction: row; overflow-x: auto; gap: 8px; padding-bottom: 4px;
    scrollbar-width: none;
  }
  .cat-nav::-webkit-scrollbar { display: none; }
  .cat-item { width: auto; flex-shrink: 0; border: 1px solid var(--border); background: var(--card); padding: 7px 12px; }
  .cat-item.active { border-color: var(--primary); }
  .cat-item .cc { display: none; }
}
@media (max-width: 560px) {
  .brand-text small { display: none; }
  .admin-link { padding: 8px 12px; }
  .grid { grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); gap: 10px; }
  .link-card { padding: 13px; gap: 10px; min-height: 88px; }
  .lc-icon { width: 34px; height: 34px; font-size: 15px; }
  .lc-desc { -webkit-line-clamp: 2; }
}