/*!
 * style.css — AI 工具导航站（简约版 v1）
 * 依据 docs/architecture.md 4.5 响应式断点 / 4.6 浅色变量层
 * 默认浅色；v1 不写 prefers-color-scheme（仅预留变量，后续跟随系统只需追加媒体查询）
 */

/* ============ 变量层 ============ */
:root {
  --bg: #F6F7F9;
  --bg-elev: #FFFFFF;
  --card: #FFFFFF;
  --fg: #1B1F24;
  --fg-muted: #5F6B7A;
  --fg-subtle: #8A95A3;
  --border: #E4E7EC;
  --border-strong: #D5DAE1;
  --primary: #5B8DEF;
  --primary-strong: #3E74E0;
  --primary-soft: #EDF3FE;

  --radius-sm: 8px;
  --radius: 12px;
  --radius-lg: 16px;

  --shadow-sm: 0 1px 2px rgba(16, 24, 40, .05);
  --shadow: 0 2px 8px rgba(16, 24, 40, .06), 0 1px 2px rgba(16, 24, 40, .04);
  --shadow-hover: 0 8px 24px rgba(16, 24, 40, .10), 0 2px 6px rgba(16, 24, 40, .05);

  --tap: 44px;                /* 触控目标最小尺寸 */
  --wrap: 1440px;             /* 内容最大宽度：从 1200 提到 1440，减少宽屏两侧留白 */
  --pad: 16px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
          "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", sans-serif;
}

/* ============ 基础重置 ============ */
*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font);
  font-size: 15px;
  line-height: 1.6;
  /* 防横向滚动兜底 */
  overflow-x: hidden;
}

h1, h2, h3, p { margin: 0; }

a { color: inherit; text-decoration: none; }

button {
  font: inherit;
  color: inherit;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}

input { font: inherit; }

/* 移动端：去除点击 300ms 延迟与双击缩放 */
button, a, .card { touch-action: manipulation; }

:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
  border-radius: 4px;
}

.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 100;
  padding: 10px 16px;
  background: var(--primary);
  color: #fff;
  border-radius: 0 0 var(--radius-sm) 0;
}
.skip-link:focus { left: 0; }

.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin: 0 auto;
  padding-left: var(--pad);
  padding-right: var(--pad);
}

/* ============ 页头 ============ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  padding-top: env(safe-area-inset-top, 0);   /* 刘海屏安全区 */
  background: rgba(255, 255, 255, .92);
  -webkit-backdrop-filter: saturate(180%) blur(10px);
  backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  padding-top: 14px;
  padding-bottom: 12px;
}

.brand { display: flex; align-items: center; gap: 10px; min-width: 0; }

.brand-mark {
  flex: none;
  width: 36px; height: 36px;
  display: grid;
  place-items: center;
  border-radius: 10px;
  background: var(--primary);
  color: #fff;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .5px;
}

.brand-text { min-width: 0; }

.brand-title { font-size: 18px; font-weight: 700; letter-spacing: .2px; }

.brand-sub {
  font-size: 12px;
  color: var(--fg-subtle);
  overflow-wrap: anywhere;
}

/* 搜索框 */
.search-wrap { position: relative; min-width: 0; }

.search-input {
  width: 100%;
  min-height: var(--tap);
  padding: 0 40px 0 14px;
  font-size: 16px;            /* ≥16px 避免 iOS 聚焦自动缩放 */
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  background: var(--bg-elev);
  color: var(--fg);
  transition: border-color .15s ease, box-shadow .15s ease;
  -webkit-appearance: none;
  appearance: none;
}
.search-input::placeholder { color: var(--fg-subtle); }
.search-input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-soft);
}
.search-input::-webkit-search-cancel-button { -webkit-appearance: none; appearance: none; }

.search-clear {
  position: absolute;
  right: 4px; top: 50%;
  transform: translateY(-50%);
  width: 34px; height: 34px;
  display: grid;
  place-items: center;
  border: 0;
  border-radius: 50%;
  background: transparent;
  color: var(--fg-subtle);
  font-size: 20px;
  line-height: 1;
}
.search-clear:hover { background: var(--border); color: var(--fg); }

.count-bar {
  font-size: 13px;
  color: var(--fg-muted);
  overflow-wrap: anywhere;
}

/* ============ 分类栏 ============ */
.category-bar {
  position: sticky;
  top: var(--header-h, 0);   /* 跟随页头高度，避免移动端吸顶重叠 */
  z-index: 15;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
}

.chips {
  display: flex;
  gap: 8px;
  align-items: center;
  padding-top: 10px;
  padding-bottom: 10px;
  overflow-x: auto;
  overflow-y: hidden;
  scrollbar-width: thin;
  -webkit-overflow-scrolling: touch;
}
.chips::-webkit-scrollbar { height: 4px; }
.chips::-webkit-scrollbar-thumb { background: var(--border-strong); border-radius: 2px; }

.chip {
  flex: none;
  min-height: var(--tap);
  padding: 0 16px;
  display: inline-flex;
  align-items: center;
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  background: var(--card);
  color: var(--fg-muted);
  font-size: 14px;
  white-space: nowrap;
  transition: background .15s ease, color .15s ease, border-color .15s ease;
}
.chip:hover { border-color: var(--primary); color: var(--primary-strong); }
.chip.is-active {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
  font-weight: 600;
}

/* ============ 主区 / 网格 ============ */
main { padding-top: 20px; padding-bottom: 40px; }

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 16px;
  align-items: stretch;
  min-width: 0;
}
.grid.is-empty { display: block; }

/* 「全部」视图分块模式：外层不再当卡片栅格排，改为单列堆叠，
   真正的卡片栅格下沉到 .cat-block-grid（架构 4.3.1） */
.grid.is-grouped {
  display: block;      /* 用 block 堆叠 section，天然免掉栅格 gap 干扰 */
  min-width: 0;
}

/* ============ 分类区块（「全部」视图） ============ */
.cat-block { min-width: 0; }
.cat-block + .cat-block { margin-top: 28px; }

.cat-block-head {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 4px 10px;
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
  min-width: 0;
}
.cat-block-title {
  min-width: 0;
  font-size: 17px;
  font-weight: 700;
  letter-spacing: .2px;
  color: var(--fg);
  overflow-wrap: anywhere;
}
.cat-block-count {
  flex: none;
  font-size: 12.5px;
  color: var(--fg-subtle);
}

/* 区块内卡片栅格：与平铺网格同一套栅格参数，视觉一致 */
.cat-block-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 16px;
  align-items: stretch;
}

/* ============ 卡片 ============ */
.card {
  display: flex;
  flex-direction: row;          /* v1.2：横向紧凑卡片 */
  align-items: center;
  gap: 12px;
  min-width: 0;                 /* 关键：允许内部文字收缩，防溢出 */
  padding: 12px 14px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  position: relative;           /* 支撑整卡可点击（stretched-link） */
  cursor: pointer;
  transition: transform .15s ease, box-shadow .15s ease, border-color .15s ease;
}
.card:hover {
  transform: translateY(-2px);
  border-color: var(--border-strong);
  box-shadow: var(--shadow-hover);
}

.card-top { display: flex; gap: 12px; align-items: flex-start; min-width: 0; }

.card-avatar {
  flex: none;
  width: 40px; height: 40px;
  display: grid;
  place-items: center;
  border-radius: 10px;
  color: #fff;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .3px;
  user-select: none;
}

.card-body { flex: 1 1 auto; min-width: 0; display: flex; flex-direction: column; gap: 2px; }
.card-titles { min-width: 0; }

.card-name-row {
  display: flex;
  align-items: center;
  gap: 6px;
  min-width: 0;
}

.card-link {
  min-width: 0;
  font-size: 16px;
  font-weight: 600;
  color: var(--fg);
  overflow-wrap: anywhere;
}
/* 整卡可点击：链接 ::after 铺满卡片（相对 .card 定位），点任意位置都跳转 */
.card-link::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
}
.card-link:hover { color: var(--primary-strong); text-decoration: underline; }

.badge-featured {
  flex: none;
  padding: 1px 6px;
  border-radius: 999px;
  background: var(--primary-soft);
  color: var(--primary-strong);
  font-size: 11px;
  font-weight: 600;
}

.card-meta { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 6px; }

.tag {
  padding: 1px 8px;
  border-radius: 999px;
  font-size: 12px;
  line-height: 1.7;
  white-space: nowrap;
  border: 1px solid transparent;
}
.tag-category { background: var(--primary-soft); color: var(--primary-strong); }
.tag-region.is-cn { background: #FDEFEC; color: #C4562E; }
.tag-region.is-global { background: #EAF4EF; color: #2F7A5C; }

.card-desc {
  margin-top: 4px;
  min-width: 0;
  font-size: 13px;
  color: var(--fg-muted);
  overflow-wrap: anywhere;
  /* 横向紧凑卡片：最多 2 行，超出省略 */
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  line-clamp: 2;
  overflow: hidden;
}

.card-foot {
  flex: none;
  display: flex;
  justify-content: flex-end;
}

.btn-visit {
  min-height: var(--tap);
  min-width: 72px;
  padding: 0 18px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius);
  background: var(--primary);
  color: #fff;
  font-size: 14px;
  font-weight: 600;
  position: relative;           /* 高于整卡 overlay，保持独立可点 */
  z-index: 1;
  transition: background .15s ease;
}
.btn-visit:hover { background: var(--primary-strong); }
.btn-visit.is-disabled {
  background: var(--border);
  color: var(--fg-subtle);
  cursor: not-allowed;
  pointer-events: none;
}

/* ============ 空状态 ============ */
.empty-state {
  padding: 64px 20px;
  text-align: center;
  background: var(--card);
  border: 1px dashed var(--border-strong);
  border-radius: var(--radius-lg);
}
.empty-icon { font-size: 32px; line-height: 1; }
.empty-title { margin-top: 12px; font-size: 17px; font-weight: 600; }
.empty-hint {
  margin-top: 8px;
  font-size: 13px;
  color: var(--fg-muted);
  overflow-wrap: anywhere;
}
.btn-reset {
  margin-top: 18px;
  min-height: var(--tap);
  padding: 0 18px;
  border: 1px solid var(--primary);
  border-radius: var(--radius);
  background: var(--card);
  color: var(--primary-strong);
  font-size: 14px;
  font-weight: 600;
}
.btn-reset:hover { background: var(--primary-soft); }

/* ============ 致命错误占位（data.js 缺失时） ============ */
.fatal-state {
  margin: 40px 0;
  padding: 28px 24px;
  background: #FFF7F6;
  border: 1px solid #F3C9C2;
  border-radius: var(--radius-lg);
  text-align: center;
}
.fatal-title { font-size: 18px; font-weight: 700; color: #B4443A; }
.fatal-detail { margin-top: 10px; font-size: 14px; color: var(--fg-muted); overflow-wrap: anywhere; }
.fatal-tip { margin-top: 8px; font-size: 13px; color: var(--fg-subtle); overflow-wrap: anywhere; }

/* ============ 顶部主导航（参考排行榜网扁平菜单；仅桌面端显示） ============ */
.topnav {
  border-top: 1px solid var(--border);
  background: rgba(255, 255, 255, .92);
}
.topnav-inner {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 8px 0;
  flex-wrap: wrap;
}
.topnav-link {
  padding: 7px 14px;
  border-radius: 8px;
  color: var(--fg-muted);
  font-size: 14px;
  font-weight: 500;
  white-space: nowrap;
  transition: background .15s ease, color .15s ease;
}
.topnav-link:hover, .topnav-link.is-active {
  background: var(--primary-soft);
  color: var(--primary-strong);
}
.topnav-cta {
  margin-left: auto;
  padding: 7px 16px;
  border-radius: 999px;
  background: var(--primary);
  color: #fff;
  font-size: 14px;
  font-weight: 600;
  white-space: nowrap;
  transition: background .15s ease;
}
.topnav-cta:hover { background: var(--primary-strong); }

/* ============ 底部导航栏 ============ */
.site-footer {
  border-top: 1px solid var(--border);
  background: var(--bg-elev);
  padding: 36px 0 calc(28px + env(safe-area-inset-bottom, 0));
  font-size: 13px;
  color: var(--fg-muted);
}
.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 28px 24px;
}
.footer-col { min-width: 0; }
.footer-logo { display: flex; align-items: center; gap: 8px; }
.footer-logo-tx { font-size: 16px; font-weight: 700; color: var(--fg); }
.footer-desc { margin-top: 10px; line-height: 1.7; overflow-wrap: anywhere; }
.footer-h {
  margin: 0 0 12px;
  font-size: 13px;
  font-weight: 700;
  color: var(--fg);
  letter-spacing: .3px;
}
.footer-links { display: flex; flex-direction: column; flex-wrap: wrap; gap: 8px; }
.footer-link {
  color: var(--fg-muted);
  font-size: 13px;
  line-height: 1.6;
  width: fit-content;
  transition: color .15s ease;
}
.footer-link:hover { color: var(--primary-strong); text-decoration: underline; }
.footer-about { line-height: 1.7; overflow-wrap: anywhere; }
.footer-about + .footer-about { margin-top: 10px; }
.footer-mail { color: var(--primary-strong); }
.footer-mail:hover { text-decoration: underline; }
.footer-bottom {
  margin-top: 28px;
  padding-top: 18px;
  border-top: 1px solid var(--border);
  text-align: center;
  color: var(--fg-subtle);
  font-size: 12.5px;
}
.footer-bottom .footer-note { margin-top: 6px; overflow-wrap: anywhere; }

/* 移动端隐藏顶部主导航（底部 Tab 栏已承担导航职责，避免重复） */
@media (max-width: 768px) {
  .topnav { display: none; }
  .footer-grid { gap: 22px 16px; }
}

/* ============ v1.2 布局：左侧分类栏 + 内容区 ============ */
.layout {
  display: flex;
  gap: 24px;
  align-items: flex-start;
  min-width: 0;
}
.sidebar { display: none; }   /* 默认隐藏，≥1024px 才显示（移动端用顶部 chips） */
.content { flex: 1 1 auto; min-width: 0; }

/* 左侧分类导航（桌面） */
.side-nav { display: flex; flex-direction: column; gap: 2px; }
.side-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  width: 100%;
  min-height: 40px;
  padding: 0 12px;
  border: 0;
  border-radius: 10px;
  background: transparent;
  color: var(--fg-muted);
  font-size: 14px;
  text-align: left;
  transition: background .15s ease, color .15s ease;
}
.side-item:hover { background: var(--border); color: var(--fg); }
.side-item.is-active { background: var(--primary-soft); color: var(--primary-strong); font-weight: 600; }
.side-count {
  flex: none;
  min-width: 24px;
  padding: 1px 8px;
  border-radius: 999px;
  background: var(--bg);
  color: var(--fg-subtle);
  font-size: 12px;
  text-align: center;
}
.side-item.is-active .side-count { background: #fff; color: var(--primary-strong); }

/* Hero 区（仅在「全部」且无关键词时显示） */
.hero {
  margin-bottom: 24px;
  padding: 28px 24px;
  text-align: center;
  background: linear-gradient(135deg, #EEF3FE 0%, #F6F7F9 70%);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
}
.hero[hidden] { display: none; }
.hero-title { font-size: 24px; font-weight: 800; letter-spacing: .3px; }
.hero-sub { margin-top: 8px; font-size: 14px; color: var(--fg-muted); overflow-wrap: anywhere; }
.hero-search-wrap { position: relative; max-width: 520px; margin: 18px auto 0; }
.hero-search-input {
  width: 100%;
  min-height: 48px;
  padding: 0 44px 0 16px;
  font-size: 16px;            /* ≥16px 避免 iOS 聚焦自动缩放 */
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  background: var(--bg-elev);
  color: var(--fg);
  font-size: 15px;
  -webkit-appearance: none;
  appearance: none;
  box-shadow: var(--shadow-sm);
}
.hero-search-input:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px var(--primary-soft); }
.hero-search-input::placeholder { color: var(--fg-subtle); }
.hero-search-input::-webkit-search-cancel-button { -webkit-appearance: none; appearance: none; }
.hero-search-clear {
  position: absolute; right: 6px; top: 50%; transform: translateY(-50%);
  width: 36px; height: 36px; display: grid; place-items: center;
  border: 0; border-radius: 50%; background: transparent; color: var(--fg-subtle);
  font-size: 20px; line-height: 1;
}
.hero-search-clear:hover { background: var(--border); color: var(--fg); }
.hero-stats { display: flex; justify-content: center; gap: 28px; margin-top: 18px; flex-wrap: wrap; }
.hero-stat { display: flex; flex-direction: column; align-items: center; }
.hero-stat-num { font-size: 22px; font-weight: 800; color: var(--primary-strong); line-height: 1.2; }
.hero-stat-label { font-size: 12px; color: var(--fg-subtle); }

/* 🔥 热门推荐 */
.hot-section { margin-bottom: 28px; }
.hot-section[hidden] { display: none; }
.hot-head { display: flex; align-items: center; gap: 8px; margin-bottom: 12px; }
.hot-flame { font-size: 18px; line-height: 1; }
.hot-title { font-size: 18px; font-weight: 700; }
.hot-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 16px;
  align-items: stretch;
}

/* 实时热度窗口切换 + 热门搜索词（动态重排控件） */
.hot-win {
  margin-left: 8px;
  font-size: 12px;
  font-weight: 500;
  color: var(--fg-subtle);
  background: var(--bg);
  border: 1px solid var(--border);
  padding: 2px 10px;
  border-radius: 999px;
  white-space: nowrap;
}
.hot-tabs {
  display: flex;
  gap: 6px;
  margin: 2px 0 12px;
  flex-wrap: wrap;
}
.hot-tab {
  min-height: 30px;
  padding: 0 12px;
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  background: var(--card);
  color: var(--fg-muted);
  font-size: 12.5px;
  transition: background .15s ease, color .15s ease, border-color .15s ease;
}
.hot-tab:hover { border-color: var(--primary); color: var(--primary-strong); }
.hot-tab.is-active {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
  font-weight: 600;
}
.hot-queries {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: 12px;
}
.hot-q-label { font-size: 12.5px; color: var(--fg-subtle); white-space: nowrap; }
.hot-q {
  padding: 3px 12px;
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  background: var(--card);
  color: var(--fg-muted);
  font-size: 12.5px;
  transition: background .15s ease, color .15s ease, border-color .15s ease;
}
.hot-q:hover { border-color: var(--primary); color: var(--primary-strong); background: var(--primary-soft); }

/* 工具 logo（favicon 在线获取，失败降级首字母色块，架构 4.8） */
.card-logo {
  flex: none;
  width: 40px; height: 40px;
  border-radius: 10px;
  object-fit: cover;
  background: var(--bg-elev);
}

/* ============ 响应式 ============ */
/* ≥480px：大屏手机 —— 搜索框与品牌同排（两列均可收缩，min 0 防小宽度溢出） */
@media (min-width: 480px) {
  :root { --pad: 20px; }
  .grid { gap: 18px; }
  .cat-block-grid { gap: 18px; }
  .cat-block + .cat-block { margin-top: 32px; }
  .header-inner {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.2fr);
    align-items: center;
  }
  .search-wrap { grid-column: 2; }
  .count-bar { grid-column: 1 / -1; }
}

/* ≥768px：平板 —— 3 列由 auto-fill 自然给出，卡片更宽松 */
@media (min-width: 768px) {
  :root { --pad: 24px; }
  body { font-size: 15.5px; }
  main { padding-top: 26px; }
  .grid { gap: 20px; }
  .cat-block-grid { gap: 20px; }
  .cat-block + .cat-block { margin-top: 36px; }
  .cat-block-title { font-size: 18px; }
  .header-inner { padding-top: 18px; padding-bottom: 16px; }
}

/* ≥1024px：桌面 —— 容器 1440px 居中，列宽略增以填充更宽空间 */
@media (min-width: 1024px) {
  main { padding-top: 30px; }
  .grid { grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 22px; }
  .cat-block-grid { grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 22px; }
  .cat-block + .cat-block { margin-top: 40px; }
  .cat-block-title { font-size: 19px; }
  .card { padding: 14px 16px; }

  /* v1.2：桌面显示左侧固定分类栏、隐藏顶部横向 chips */
  .category-bar { display: none; }
  .sidebar {
    display: block;
    flex: none;
    width: 200px;
    position: sticky;
    top: 120px;                 /* 避开吸顶页头（移动端重叠属已知问题，桌面规避） */
    align-self: flex-start;
    max-height: calc(100vh - 150px);
    overflow-y: auto;
  }
}

/* 375px 及以下：单列兜底，杜绝横向滚动 */
@media (max-width: 374px) {
  :root { --pad: 12px; }
  .grid { grid-template-columns: 1fr; gap: 12px; }
  .cat-block-grid { grid-template-columns: 1fr; gap: 12px; }
  .cat-block + .cat-block { margin-top: 24px; }
  .card { padding: 14px; }
}

/* ============ 移动端差异化 v2（同域响应式，手机专属交互） ============ */
.mobile-tabbar { display: none; }                 /* 默认隐藏，≤768px 才显示 */
.cat-sheet[hidden], .sheet-mask[hidden] { display: none; }

.tab-btn {
  flex: 1 1 0; min-height: 44px; padding: 0;
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 2px;
  border: 0; background: transparent; color: var(--fg-subtle); font-size: 11px;
}
.tab-btn .tab-ico { font-size: 18px; line-height: 1; }
.tab-btn.is-active { color: var(--primary-strong); }

.cat-sheet-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 12px; font-weight: 700; font-size: 16px; }
.cat-sheet-close { width: 34px; height: 34px; border: 0; background: transparent; font-size: 22px; color: var(--fg-subtle); }
.cat-sheet-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; }
.cat-sheet-item {
  min-height: 44px; border: 1px solid var(--border-strong); border-radius: 10px;
  background: var(--card); color: var(--fg-muted); font-size: 14px;
}
.cat-sheet-item.is-active { background: var(--primary); border-color: var(--primary); color: #fff; font-weight: 600; }

@media (max-width: 768px) {
  /* 底部 Tab 栏（固定吸底，避让 Home 指示条） */
  .mobile-tabbar {
    display: flex;
    position: fixed; left: 0; right: 0; bottom: 0; z-index: 30;
    height: calc(56px + env(safe-area-inset-bottom, 0));
    padding-bottom: env(safe-area-inset-bottom, 0);
    background: rgba(255, 255, 255, .96);
    -webkit-backdrop-filter: saturate(180%) blur(10px);
    backdrop-filter: saturate(180%) blur(10px);
    border-top: 1px solid var(--border);
  }
  /* 预留底部空间，避免内容被 Tab 栏遮挡 */
  body { padding-bottom: calc(56px + env(safe-area-inset-bottom, 0)); }

  /* 信息密度：移动端隐藏分类标签（分类上下文已明显），卡片更紧凑 */
  .tag-category { display: none; }
  .card { padding: 10px 12px; }
  .card-avatar, .card-logo { width: 36px; height: 36px; }

  /* 分类底部弹层 */
  .sheet-mask {
    position: fixed; inset: 0; z-index: 40;
    background: rgba(16, 24, 40, .45);
  }
  .cat-sheet {
    position: fixed; left: 0; right: 0; bottom: 0; z-index: 41;
    display: block;
    background: var(--bg-elev); border-radius: 16px 16px 0 0;
    padding: 16px 16px calc(20px + env(safe-area-inset-bottom, 0));
    max-height: 70vh; overflow-y: auto;
    box-shadow: 0 -8px 30px rgba(16, 24, 40, .18);
    animation: sheet-up .2s ease;
  }
  @keyframes sheet-up { from { transform: translateY(100%); } to { transform: translateY(0); } }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    transition-duration: .01ms !important;
    animation-duration: .01ms !important;
  }
  .card:hover { transform: none; }
}

/* ============ 排行榜 Top 榜 ============ */
.rank-list { display: flex; flex-direction: column; gap: 10px; }
.rank-item {
  display: flex; align-items: center; gap: 12px;
  padding: 10px 14px; background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); box-shadow: var(--shadow); position: relative; min-width: 0;
}
.rank-item .card-link::after { content: ""; position: absolute; inset: 0; z-index: 0; }
.rank-no {
  flex: none; width: 30px; height: 30px; display: grid; place-items: center;
  border-radius: 8px; font-weight: 800; font-size: 15px; color: #fff; background: var(--border-strong);
}
.rank-item.top1 .rank-no { background: #F5A623; }
.rank-item.top2 .rank-no { background: #9AA7B6; }
.rank-item.top3 .rank-no { background: #CD9B62; }
.rank-meta { display: flex; flex-direction: column; min-width: 0; }
.rank-meta .card-link { font-size: 15px; font-weight: 600; color: var(--fg); }
.rank-meta .card-desc { margin-top: 2px; font-size: 12.5px; color: var(--fg-muted); overflow-wrap: anywhere; }
.rank-score { margin-left: auto; flex: none; font-size: 13px; color: var(--fg-muted); white-space: nowrap; }

/* 卡片收藏星标 + 评分入口（高于整卡 overlay，独立可点） */
.card-actions { position: absolute; top: 8px; right: 8px; z-index: 1; display: flex; gap: 6px; }
.fav-btn, .score-btn {
  width: 30px; height: 30px; border: 0; border-radius: 50%;
  background: rgba(255, 255, 255, .92); box-shadow: var(--shadow-sm);
  display: grid; place-items: center; font-size: 15px; line-height: 1; color: var(--fg-subtle);
}
.fav-btn.is-on { color: #F5A623; }
.score-btn { width: auto; padding: 0 10px; border-radius: 999px; font-size: 12px; font-weight: 700; color: var(--primary-strong); }
.score-btn.has-score { color: #F5A623; }

/* ============ 使用教程 ============ */
.tut-card { display: block; padding: 16px 18px; background: var(--card); border: 1px solid var(--border); border-radius: var(--radius-lg); box-shadow: var(--shadow); }
.tut-card:hover { border-color: var(--border-strong); box-shadow: var(--shadow-hover); }
.tut-card h3 { font-size: 16px; font-weight: 700; color: var(--fg); }
.tut-card p { margin-top: 6px; font-size: 13px; color: var(--fg-muted); overflow-wrap: anywhere; }

/* ============ 评价弹层（多维评分 + 带理由评价） ============ */
.review-modal {
  position: fixed; left: 50%; top: 50%; transform: translate(-50%, -50%); z-index: 60;
  width: min(520px, calc(100vw - 32px)); max-height: 84vh; overflow-y: auto;
  background: var(--bg-elev); border-radius: 16px; padding: 18px;
  box-shadow: 0 20px 60px rgba(16, 24, 40, .28); animation: sheet-up .2s ease;
}
.review-modal[hidden] { display: none; }
.review-modal-head { display: flex; align-items: center; justify-content: space-between; font-weight: 700; font-size: 16px; margin-bottom: 12px; }
.review-summary { margin-bottom: 12px; }
.review-overall { display: flex; align-items: baseline; gap: 8px; }
.review-overall-num { font-size: 26px; font-weight: 800; color: #F5A623; }
.review-overall-label { font-size: 12px; color: var(--fg-subtle); }
.review-dim { display: flex; align-items: center; gap: 10px; margin-top: 6px; font-size: 13px; }
.review-dim-name { flex: none; width: 72px; color: var(--fg-muted); }
.review-dim-bar { flex: 1; height: 8px; border-radius: 999px; background: var(--border); overflow: hidden; }
.review-dim-fill { height: 100%; background: #F5A623; border-radius: 999px; }
.review-list { display: flex; flex-direction: column; gap: 10px; margin: 6px 0 12px; }
.review-item { padding: 10px 12px; background: var(--bg); border: 1px solid var(--border); border-radius: 10px; }
.review-item-head { display: flex; align-items: center; gap: 8px; font-size: 13px; }
.review-sentiment { padding: 1px 8px; border-radius: 999px; font-size: 11px; font-weight: 700; }
.review-sentiment.good { background: #EAF4EF; color: #2F7A5C; }
.review-sentiment.mid { background: var(--primary-soft); color: var(--primary-strong); }
.review-sentiment.bad { background: #FDEFEC; color: #C4562E; }
.review-item-text { margin-top: 6px; font-size: 13px; color: var(--fg); overflow-wrap: anywhere; }
.review-empty { font-size: 13px; color: var(--fg-subtle); padding: 6px 0; }
.review-form-title { font-size: 13px; font-weight: 700; margin-bottom: 8px; }
.review-dims { display: flex; flex-direction: column; gap: 8px; margin-bottom: 10px; }
.review-dim-row { display: flex; align-items: center; gap: 10px; font-size: 13px; }
.review-dim-row .review-dim-name { width: 72px; }
.stars { display: inline-flex; gap: 2px; }
.stars button { width: 26px; height: 26px; border: 0; background: transparent; font-size: 18px; color: var(--border-strong); cursor: pointer; }
.stars button.on { color: #F5A623; }
.review-text { width: 100%; border: 1px solid var(--border-strong); border-radius: 10px; padding: 10px; font: inherit; font-size: 14px; resize: vertical; }
.review-actions { margin-top: 10px; display: flex; justify-content: flex-end; }
.review-tip { margin-top: 8px; font-size: 12.5px; color: var(--fg-muted); min-height: 16px; }
.review-tip.ok { color: #2F7A5C; }
.review-tip.err { color: #C4562E; }

/* 轻提示 */
.toast {
  position: fixed; left: 50%; bottom: calc(80px + env(safe-area-inset-bottom, 0)); transform: translateX(-50%);
  z-index: 70; background: rgba(27, 31, 36, .92); color: #fff; padding: 10px 16px; border-radius: 999px;
  font-size: 13px; box-shadow: var(--shadow-hover); opacity: 0; transition: opacity .2s ease; pointer-events: none;
}
.toast.show { opacity: 1; }

/* ============ 卡片「教程」按钮 ============ */
.tut-btn {
  border: 1px solid var(--border-strong); background: var(--bg-elev); color: var(--fg-muted);
  font: inherit; font-size: 12.5px; min-height: var(--tap); padding: 0 12px; border-radius: 999px; cursor: pointer;
  transition: background .15s ease, color .15s ease, border-color .15s ease;
}
.tut-btn:hover { background: var(--brand-soft); color: var(--brand); border-color: var(--brand); }

/* ============ 使用教程视图 ============ */
.tut-grid { gap: 16px; align-items: start; }
.tut-cat { font-size: 17px; font-weight: 700; margin: 18px 2px 2px; color: var(--fg); }
.tut-grid > .tut-cat:first-child { margin-top: 4px; }
.tut-back { margin: 2px 2px 10px; }
.tut-card {
  background: var(--card); border: 1px solid var(--border); border-radius: 14px; padding: 16px 18px;
  box-shadow: var(--shadow); display: flex; flex-direction: column; gap: 10px;
}
.tut-head { display: flex; flex-direction: column; gap: 6px; }
.tut-title { font-size: 15.5px; font-weight: 700; margin: 0; color: var(--fg); line-height: 1.4; }
.tut-tags { display: flex; flex-wrap: wrap; gap: 6px; }
.tag-level { background: var(--brand-soft); color: var(--brand); border: 1px solid transparent; border-radius: 999px; padding: 1px 9px; font-size: 11.5px; }
.tag-cat { background: #EEF2FF; color: #4250C2; border: 1px solid transparent; border-radius: 999px; padding: 1px 9px; font-size: 11.5px; }
.tut-src { align-self: flex-start; font-size: 13px; color: var(--brand); text-decoration: none; font-weight: 600; }
.tut-src:hover { text-decoration: underline; }
.tut-secs { display: flex; flex-direction: column; gap: 10px; border-top: 1px dashed var(--border); padding-top: 10px; }
.tut-sec { display: flex; flex-direction: column; gap: 3px; }
.tut-sec-h { font-size: 13.5px; font-weight: 700; margin: 0; color: var(--brand); }
.tut-sec-p { font-size: 13.5px; line-height: 1.7; margin: 0; color: var(--fg-soft); overflow-wrap: anywhere; }

/* 窄屏：教程卡片单列铺满 */
@media (max-width: 768px) {
  .tut-card { padding: 14px 14px; }
  .tut-title { font-size: 15px; }
}