/* ============================================================
   前台主题系统：4 套配色 × 明暗模式（双轴，CSS 自定义属性）
   html[data-theme=blue|orange|purple|green] × html[data-mode=light|dark]
   ============================================================ */
:root,
[data-theme="blue"] {
  --bg: #f4f6fb; --bg-card: #ffffff; --bg-sidebar: #ffffff;
  --text: #1f2937; --text-muted: #6b7280; --border: #e5e7eb;
  --accent: #3b82f6; --accent-strong: #2563eb; --accent-soft: rgba(59, 130, 246, .12);
  --shadow: 0 4px 16px rgba(31, 41, 55, .07);
  --shadow-hover: 0 12px 28px rgba(31, 41, 55, .13);
  --radius: 14px;
  color-scheme: light;
}
[data-theme="orange"] {
  --accent: #f97316; --accent-strong: #ea580c; --accent-soft: rgba(249, 115, 22, .12);
}
[data-theme="purple"] {
  --accent: #8b5cf6; --accent-strong: #7c3aed; --accent-soft: rgba(139, 92, 246, .12);
}
[data-theme="green"] {
  --accent: #10b981; --accent-strong: #059669; --accent-soft: rgba(16, 185, 129, .12);
}

[data-mode="dark"] { --bg: #0f172a; --bg-card: #1e293b; --bg-sidebar: #111827;
  --text: #e2e8f0; --text-muted: #94a3b8; --border: #334155;
  --shadow: 0 4px 16px rgba(0, 0, 0, .3);
  --shadow-hover: 0 12px 30px rgba(0, 0, 0, .5);
  color-scheme: dark; }
[data-theme="blue"][data-mode="dark"]   { --accent: #60a5fa; --accent-strong: #3b82f6; --accent-soft: rgba(96, 165, 250, .16); }
[data-theme="orange"][data-mode="dark"] { --accent: #fb923c; --accent-strong: #f97316; --accent-soft: rgba(251, 146, 60, .16); }
[data-theme="purple"][data-mode="dark"] { --accent: #a78bfa; --accent-strong: #8b5cf6; --accent-soft: rgba(167, 139, 250, .16); }
[data-theme="green"][data-mode="dark"]  { --accent: #34d399; --accent-strong: #10b981; --accent-soft: rgba(52, 211, 153, .16); }

/* 明暗过渡 */
body, .topbar, .sidebar, .card, .footer, .announce, .search-wrap input, .group-title {
  transition: background-color .3s ease, color .3s ease, border-color .3s ease, box-shadow .3s ease;
}

/* ============================================================
   基础
   ============================================================ */
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 84px; }
body {
  font-family: system-ui, "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
  background: var(--bg); color: var(--text); font-size: 14px; line-height: 1.6;
  min-height: 100vh;
}
a { color: inherit; text-decoration: none; }
button { font-family: inherit; }

/* ============================================================
   顶栏
   ============================================================ */
.topbar {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--bg-card) 86%, transparent);
  backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.topbar-inner {
  max-width: 1440px; margin: 0 auto; padding: 12px 20px;
  display: flex; align-items: center; gap: 16px;
}
.brand { display: flex; align-items: center; gap: 10px; flex-shrink: 0; }
.brand-logo { height: 52px; width: auto; max-width: 230px; object-fit: contain; }
.brand-name { font-size: 18px; font-weight: 700; letter-spacing: .5px; }
.search-wrap {
  flex: 1; max-width: 560px; position: relative; margin: 0 auto;
  display: flex; align-items: stretch; height: 44px;
  border: 1px solid var(--border); border-radius: 999px; background: var(--bg);
  transition: border-color .2s, box-shadow .2s, background-color .3s;
}
.search-wrap:focus-within { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }
.search-wrap input {
  flex: 1; min-width: 60px; padding: 0 8px 0 10px; border: 0; outline: none;
  background: transparent; color: var(--text); font-size: 14px; height: 100%;
}
.engine-box { position: relative; flex-shrink: 0; display: flex; align-items: center; }
#engine-btn {
  align-self: stretch; border: 0; background: transparent; color: var(--accent); cursor: pointer;
  padding: 0 12px 0 18px; display: flex; align-items: center; justify-content: center; gap: 5px;
  border-radius: 999px 0 0 999px; transition: background .15s;
}
#engine-btn:hover { background: var(--accent-soft); }
.engine-icon { flex: none; font-size: 17px; line-height: 1; display: inline-flex; align-items: center; }
#engine-btn .caret { font-size: 10px; color: var(--text-muted); flex: none; }
.engine-box::after { content: ""; width: 1px; height: 18px; background: var(--border); margin-right: 12px; flex: none; }
#engine-menu {
  position: absolute; top: calc(100% + 8px); left: 8px; z-index: 70;
  background: var(--bg-card); border: 1px solid var(--border); border-radius: 12px;
  box-shadow: var(--shadow-hover); padding: 6px; min-width: 130px;
}
.engine-item {
  display: flex; align-items: center; gap: 9px; width: 100%; text-align: left;
  border: 0; background: transparent; color: var(--text); font-size: 13.5px;
  padding: 8px 12px; border-radius: 8px; cursor: pointer;
}
.engine-item:hover { background: var(--accent-soft); color: var(--accent); }
.engine-item i { width: 16px; text-align: center; }
.search-go {
  border: 0; background: transparent; color: var(--text-muted); cursor: pointer;
  padding: 0 16px 0 10px; font-size: 15px; display: flex; align-items: center;
  border-radius: 0 999px 999px 0; transition: color .15s, background .15s;
}
.search-go:hover { color: var(--accent); background: var(--accent-soft); }
.search-clear {
  border: 0; background: var(--border); color: var(--text-muted); width: 22px; height: 22px;
  border-radius: 50%; cursor: pointer; font-size: 11px; line-height: 1; margin-right: 10px;
  flex-shrink: 0; align-self: center;
}
.icon-btn {
  border: 1px solid var(--border); background: var(--bg-card); color: var(--text-muted);
  width: 38px; height: 38px; border-radius: 10px; cursor: pointer; font-size: 16px;
  display: inline-flex; align-items: center; justify-content: center; flex-shrink: 0;
  transition: color .15s, border-color .15s, transform .1s, background-color .3s;
}
.icon-btn:hover { color: var(--accent); border-color: var(--accent); }
.icon-btn:active { transform: scale(.94); }
.theme-ctrl { display: flex; align-items: center; gap: 10px; flex-shrink: 0; }
.swatches { display: flex; gap: 6px; }
.swatch {
  width: 20px; height: 20px; border-radius: 50%; cursor: pointer; border: 2px solid transparent;
  outline: 2px solid transparent; outline-offset: 2px; transition: outline-color .15s, transform .15s;
}
.swatch:hover { transform: scale(1.15); }
.swatch.active { outline-color: var(--accent); }
.swatch[data-set-theme="blue"]   { background: #3b82f6; }
.swatch[data-set-theme="orange"] { background: #f97316; }
.swatch[data-set-theme="purple"] { background: #8b5cf6; }
.swatch[data-set-theme="green"]  { background: #10b981; }

/* 天气条 / 全屏按钮 */
.weather-chip {
  display: flex; align-items: center; gap: 6px; flex-shrink: 0;
  font-size: 13px; color: var(--text-muted); text-decoration: none;
  border: 1px solid var(--border); border-radius: 999px; padding: 7px 13px;
  background: var(--bg-card); transition: color .15s, border-color .15s, background-color .3s;
}
.weather-chip[hidden] { display: none; } /* display:flex 会覆盖 hidden 属性，显式补回 */
.weather-chip:hover { color: var(--accent); border-color: var(--accent); }
.weather-chip .wx-city { font-size: 12.5px; }
.weather-chip .wx-temp { font-weight: 700; color: var(--text); }
.weather-chip .wx-emoji { font-size: 15px; line-height: 1; }
.icon-btn.active { color: var(--accent); border-color: var(--accent); background: var(--accent-soft); }

/* 全屏显示模式：收起侧栏，内容全宽 */
html.fs .sidebar { display: none; }
html.fs .layout { max-width: 100%; }
html.fs .grid { grid-template-columns: repeat(auto-fill, minmax(196px, 1fr)); }
html.fs .topbar-inner, html.fs .footer, html.fs .announce { max-width: 100%; }

/* 公告条 */
.announce {
  max-width: 1440px; margin: 14px auto -8px; padding: 0 20px;
}
.announce {
  background: var(--accent-soft); border: 1px solid var(--accent);
  border-radius: 10px; padding: 9px 16px; font-size: 13px; color: var(--text);
}

/* ============================================================
   布局：侧栏 + 内容（WebStack 骨架）
   ============================================================ */
.layout { max-width: 1440px; margin: 20px auto 0; padding: 0 20px; display: flex; gap: 22px; align-items: flex-start; }
.sidebar {
  width: 216px; flex-shrink: 0; position: sticky; top: 84px;
  background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 12px; box-shadow: var(--shadow);
}
.cat-nav { display: flex; flex-direction: column; gap: 2px; }
.cat-item {
  display: flex; align-items: center; gap: 10px; padding: 9px 12px; border-radius: 9px;
  color: var(--text-muted); transition: background .15s, color .15s, transform .15s;
}
.cat-item:hover { background: var(--accent-soft); color: var(--accent); transform: translateX(3px); }
.cat-icon { width: 20px; text-align: center; font-size: 15px; }
.cat-name { flex: 1; font-size: 13.5px; }
.cat-count {
  font-size: 11px; color: var(--text-muted); background: var(--bg);
  border-radius: 8px; padding: 1px 7px;
}
.drawer-mask { display: none; }

.content { flex: 1; min-width: 0; padding-bottom: 24px; }
.group { margin-bottom: 34px; }
.group-title {
  display: flex; align-items: center; gap: 9px; font-size: 16.5px; font-weight: 700;
  margin-bottom: 14px; padding-left: 2px;
}
.group-title i { color: var(--accent); font-size: 15px; }
.group-count {
  font-size: 11.5px; font-weight: 500; color: var(--text-muted);
  background: var(--bg-card); border: 1px solid var(--border); padding: 1px 9px; border-radius: 9px;
}

/* ============================================================
   卡片网格
   ============================================================ */
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(184px, 1fr)); gap: 14px; }
.card {
  position: relative;
  display: flex; align-items: center; gap: 12px; padding: 14px 15px;
  background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius);
  box-shadow: var(--shadow);
  transition: transform .2s ease, box-shadow .2s ease, border-color .2s ease,
              background-color .3s ease, opacity .25s ease;
}
.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
  border-color: var(--accent);
}
.card-icon {
  width: 40px; height: 40px; border-radius: 10px; object-fit: contain;
  background: var(--accent-soft); padding: 5px; flex-shrink: 0;
  transition: transform .2s ease, opacity .4s ease;
}
.card:hover .card-icon { transform: scale(1.12) rotate(-2deg); }
.card-body { min-width: 0; }
.card-name { display: block; font-size: 14px; font-weight: 600; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.card-desc {
  display: block; font-size: 12px; color: var(--text-muted);
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.empty { text-align: center; color: var(--text-muted); padding: 80px 0; }

/* 收藏星标 */
.fav-btn {
  position: absolute; top: 8px; right: 9px; font-size: 14px; line-height: 1;
  color: var(--text-muted); opacity: 0; cursor: pointer; user-select: none;
  transition: opacity .15s ease, color .15s ease, transform .15s ease;
}
.card:hover .fav-btn { opacity: .7; }
.fav-btn:hover { opacity: 1 !important; transform: scale(1.25); color: var(--accent); }
.fav-btn.on { opacity: 1; color: #f59e0b; }
@media (hover: none) { .fav-btn { opacity: .5; } }

/* 搜索过滤 */
.card.hiding { opacity: 0; transform: scale(.96); pointer-events: none; }
.card.hide, .group.hide { display: none !important; }

/* 入场动效（IntersectionObserver 加 .in） */
@media (prefers-reduced-motion: no-preference) {
  .card { opacity: 0; transform: translateY(14px); }
  .card.in {
    opacity: 1; transform: none;
    transition: transform .5s cubic-bezier(.2, .7, .3, 1) var(--d, 0ms), opacity .5s ease var(--d, 0ms),
                box-shadow .2s ease, border-color .2s ease, background-color .3s ease;
  }
  .card.in:hover {
    transform: translateY(-4px);
    transition-delay: 0ms;
  }
}

/* ============================================================
   页脚 / 其他
   ============================================================ */
.footer {
  max-width: 1440px; margin: 10px auto 0; padding: 22px 20px 30px;
  border-top: 1px solid var(--border); text-align: center;
  font-size: 12.5px; color: var(--text-muted);
}
.footer .icp { margin-left: 12px; }
.footer .icp:hover { color: var(--accent); }
.footer .police { margin-left: 12px; display: inline-flex; align-items: center; gap: 4px; }
.footer .police:hover { color: var(--accent); }
.footer .police img { height: 14px; width: auto; }
@media (max-width: 576px) {
  .footer .icp, .footer .police { margin-left: 0; margin: 4px 6px 0; display: inline-flex; }
}
.back-top {
  position: fixed; right: 26px; bottom: 30px; z-index: 60;
  opacity: 0; pointer-events: none; transition: opacity .25s, transform .25s, color .15s, border-color .15s;
  transform: translateY(8px);
}
.back-top.show { opacity: 1; pointer-events: auto; transform: none; }
.drawer-btn { display: none; }

/* ============================================================
   响应式
   ============================================================ */
@media (min-width: 1680px) {
  .topbar-inner, .layout, .footer, .announce { max-width: 1680px; }
  .grid { grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); }
}
@media (max-width: 1200px) and (min-width: 993px) {
  .sidebar { width: 186px; }
  .grid { grid-template-columns: repeat(auto-fill, minmax(168px, 1fr)); }
}
@media (max-width: 992px) {
  .drawer-btn { display: inline-flex; }
  .brand-logo { height: 34px; max-width: 150px; }
  .sidebar {
    position: fixed; left: 0; top: 0; bottom: 0; z-index: 100;
    border-radius: 0; border: 0; width: 240px; overflow-y: auto;
    transform: translateX(-105%); transition: transform .28s ease, background-color .3s;
    box-shadow: none;
  }
  .sidebar.open { transform: none; box-shadow: 0 0 60px rgba(0,0,0,.3); }
  .drawer-mask {
    display: block; position: fixed; inset: 0; z-index: 90; background: rgba(0, 0, 0, .45);
    opacity: 0; pointer-events: none; transition: opacity .28s;
  }
  .drawer-mask.show { opacity: 1; pointer-events: auto; }
  .grid { grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); }
}
@media (max-width: 576px) {
  .topbar-inner { padding: 10px 12px; gap: 8px; flex-wrap: wrap; }
  .brand { order: 1; }
  .theme-ctrl { order: 2; margin-left: auto; gap: 6px; flex-wrap: wrap; justify-content: flex-end; }
  .search-wrap { order: 3; flex-basis: 100%; max-width: none; }
  .fs-btn { display: none; } /* 移动端侧栏本就是抽屉、内容全宽，全屏模式无意义 */
  .weather-chip { padding: 5px 9px; font-size: 12px; gap: 4px; }
  .weather-chip .wx-desc { display: none; }
  .weather-chip .wx-emoji { font-size: 13px; }
  .swatches { gap: 4px; }
  .swatch { width: 16px; height: 16px; }
  .search-wrap { height: 42px; }
  #engine-btn { padding: 0 8px 0 12px; }
  .engine-box::after { margin-right: 8px; }
  .search-go { padding: 0 12px 0 6px; }
  .layout { padding: 0 14px; }
  .grid { grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); gap: 10px; }
  .card { padding: 12px; }
}
@media (max-width: 400px) {
  .brand-logo { height: 28px; max-width: 110px; }
  .icon-btn { width: 34px; height: 34px; font-size: 14px; }
  .weather-chip { padding: 4px 8px; }
  .grid { grid-template-columns: repeat(auto-fill, minmax(128px, 1fr)); }
  .card { padding: 10px 11px; gap: 9px; }
  .card-icon { width: 34px; height: 34px; }
  .card-desc { display: none; }
}

/* 减少动态效果 */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
  html { scroll-behavior: auto; }
  .card { opacity: 1 !important; transform: none !important; }
}