/* ============================================
   语文资源门户 v0.3 样式
   现代清新风格 · 蓝白主色
   ============================================ */

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

:root {
  --primary: #1890ff;
  --primary-dark: #096dd9;
  --primary-light: #e6f7ff;
  --accent: #52c41a;
  --warn: #fa8c16;
  --danger: #f5222d;
  --bg: #f5f7fa;
  --bg-card: #ffffff;
  --text: #1a1a1a;
  --text-secondary: #595959;
  --text-muted: #8c8c8c;
  --border: #e8e8e8;
  --border-light: #f0f0f0;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.04);
  --shadow: 0 2px 8px rgba(0,0,0,0.06);
  --shadow-lg: 0 8px 24px rgba(0,0,0,0.08);
  --radius: 12px;
  --radius-sm: 8px;
  --radius-lg: 16px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --primary: #40a9ff;
    --primary-dark: #1890ff;
    --primary-light: #111a2c;
    --bg: #0f0f0f;
    --bg-card: #1a1a1a;
    --text: #e8e8e8;
    --text-secondary: #b8b8b8;
    --text-muted: #888;
    --border: #2a2a2a;
    --border-light: #222;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.3);
    --shadow: 0 2px 8px rgba(0,0,0,0.4);
    --shadow-lg: 0 8px 24px rgba(0,0,0,0.5);
  }
}

html, body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -webkit-tap-highlight-color: transparent;
}

a { color: var(--primary); text-decoration: none; }
a:hover { color: var(--primary-dark); }
button { font-family: inherit; cursor: pointer; }
code {
  font-family: "SF Mono", Consolas, monospace;
  background: var(--bg);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.9em;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ============================================
   Spinner + 加载状态
   ============================================ */
.spinner {
  width: 32px; height: 32px;
  border: 3px solid var(--border);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin: 0 auto;
}
.spinner.big { width: 48px; height: 48px; border-width: 4px; }
@keyframes spin { to { transform: rotate(360deg); } }

.page-loading {
  position: fixed; inset: 0; z-index: 999;
  background: var(--bg);
  display: flex; align-items: center; justify-content: center;
  transition: opacity 0.3s;
}
.page-loading.hide { opacity: 0; pointer-events: none; }
.page-loading-inner { text-align: center; }

/* 看板子标题 */
.stat-sub {
  font-size: 11px;
  color: var(--text-muted);
  margin-top: 2px;
  font-weight: 400;
}

/* 年级切换器 */
.grade-switcher {
  position: relative;
  display: inline-block;
}
.grade-btn {
  background: none;
  border: none;
  color: var(--text-secondary);
  font-family: inherit;
  font-size: 14px;
  padding: 6px 10px;
  border-radius: 8px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 4px;
  transition: background 0.2s;
}
.grade-btn:hover {
  background: rgba(24,144,255,0.08);
}
.grade-btn .caret {
  font-size: 12px;
  transition: transform 0.2s;
}
.grade-switcher.open .grade-btn .caret {
  transform: rotate(180deg);
}
.grade-menu {
  position: absolute;
  top: calc(100% + 4px);
  right: 0;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: 0 8px 24px rgba(0,0,0,0.12);
  min-width: 180px;
  max-height: 400px;
  overflow-y: auto;
  z-index: 100;
  padding: 6px 0;
}
@media (prefers-color-scheme: dark) {
  .grade-menu {
    background: rgba(20,20,30,0.95);
    border-color: rgba(255,255,255,0.12);
    box-shadow: 0 8px 24px rgba(0,0,0,0.6);
  }
}
.grade-menu-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px 14px;
  cursor: pointer;
  font-size: 14px;
  transition: background 0.15s;
}
.grade-menu-item:hover {
  background: rgba(24,144,255,0.08);
}
.grade-menu-item.active {
  background: rgba(24,144,255,0.12);
  color: var(--primary);
  font-weight: 600;
}
.grade-menu-item .grade-count {
  font-size: 11px;
  color: var(--text-muted);
  margin-left: 8px;
}
.grade-menu-loading {
  padding: 12px 14px;
  color: var(--text-muted);
  font-size: 13px;
  text-align: center;
}

/* 加载进度条 */
.progress-wrap {
  width: 280px;
  margin: 16px auto 0;
}
.progress-bar {
  width: 100%;
  height: 8px;
  background: rgba(24,144,255,0.12);
  border-radius: 4px;
  overflow: hidden;
}
.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, #1890ff 0%, #722ed1 100%);
  border-radius: 4px;
  width: 0%;
  transition: width 0.2s ease;
}
.progress-info {
  display: flex;
  justify-content: space-between;
  margin-top: 6px;
  font-size: 12px;
  color: var(--text-muted);
  font-variant-numeric: tabular-nums;
}
@media (prefers-color-scheme: dark) {
  .progress-bar { background: rgba(255,255,255,0.1); }
  .progress-info { color: rgba(255,255,255,0.55); }
}
.page-loading h2 {
  font-size: 22px;
  margin: 20px 0 8px;
  color: var(--text);
}
.page-loading p {
  color: var(--text-muted);
  font-size: 14px;
}
.loading-logout {
  margin-top: 24px;
  padding: 8px 20px;
  background: transparent;
  color: var(--text-muted);
  border: 1px solid var(--border);
  border-radius: 16px;
  font-size: 13px;
  cursor: pointer;
  transition: all 0.15s;
}
.loading-logout:hover {
  color: var(--danger);
  border-color: var(--danger);
  background: rgba(245,34,45,0.06);
}

.chart-loading, .recent-loading, .cat-loading {
  grid-column: 1 / -1;
  text-align: center;
  padding: 40px 20px;
  color: var(--text-muted);
}
.chart-loading .spinner, .recent-loading .spinner, .cat-loading .spinner {
  margin-bottom: 12px;
}
.chart-loading p, .recent-loading p, .cat-loading p {
  font-size: 13px;
  color: var(--text-muted);
}

.stat-num[data-loading="true"] {
  color: var(--text-muted);
  animation: pulse 1.5s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 0.4; }
  50% { opacity: 1; }
}

/* ============================================
   顶部导航
   ============================================ */
.topnav {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255,255,255,0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
}
@media (prefers-color-scheme: dark) {
  .topnav { background: rgba(15,15,15,0.85); }
}
.nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;

  gap: 16px;
  align-items: center;
}
.brand {
  display: flex; align-items: center; gap: 10px;
  font-size: 18px; font-weight: 700;
  color: var(--text);
}
.brand-icon { font-size: 24px; }
.nav-links { display: flex; gap: 8px; }
.nav-link {
  padding: 8px 16px;
  border-radius: 8px;
  color: var(--text-secondary);
  font-size: 15px;
  font-weight: 500;
  transition: all 0.15s;
}
.nav-link:hover { background: var(--bg); color: var(--text); }
.nav-link.active { background: var(--primary-light); color: var(--primary); }
.nav-logout {
  background: transparent;
  color: var(--text-muted) !important;
  border: none;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}
.nav-logout:hover {
  background: var(--danger) !important;
  color: #fff !important;
  border-color: var(--danger);
}

/* ============================================
   Hero 区
   ============================================ */
.hero {
  position: relative;
  padding: 80px 24px 100px;
  text-align: center;
  overflow: hidden;
}
.hero-bg {
  position: absolute; inset: 0;
  background:
    radial-gradient(circle at 20% 50%, rgba(24,144,255,0.12) 0%, transparent 50%),
    radial-gradient(circle at 80% 30%, rgba(82,196,26,0.08) 0%, transparent 50%),
    radial-gradient(circle at 50% 80%, rgba(250,140,22,0.06) 0%, transparent 50%);
  z-index: 0;
}
.hero-content {
  position: relative;
  z-index: 1;
  max-width: 800px;
  margin: 0 auto;
}
.hero-badge {
  display: inline-block;
  padding: 6px 16px;
  background: var(--primary-light);
  color: var(--primary);
  border-radius: 20px;
  font-size: 13px;
  font-weight: 500;
  margin-bottom: 24px;
}
.hero-title {
  font-size: clamp(28px, 5vw, 48px);
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 20px;
  background: linear-gradient(135deg, #1890ff 0%, #096dd9 50%, #722ed1 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-subtitle {
  font-size: clamp(15px, 2vw, 17px);
  color: var(--text-secondary);
  margin-bottom: 40px;
  line-height: 1.7;
}

/* Hero 搜索 */
.hero-search {
  position: relative;
  max-width: 640px;
  margin: 0 auto 24px;
  display: flex;
  align-items: center;
  background: var(--bg-card);
  border: 2px solid var(--border);
  border-radius: 32px;
  padding: 4px 4px 4px 20px;
  box-shadow: var(--shadow);
  transition: all 0.2s;
}
.hero-search:focus-within {
  border-color: var(--primary);
  box-shadow: 0 0 0 4px rgba(24,144,255,0.15), var(--shadow);
}
.hero-search .search-icon {
  font-size: 20px;
  color: var(--text-muted);
  margin-right: 12px;
}
.hero-search input {
  flex: 1;
  border: none; outline: none;
  background: transparent;
  font-size: 16px;
  color: var(--text);
  padding: 12px 0;
}
.search-go {
  border: none;
  background: var(--primary);
  color: #fff;
  padding: 10px 24px;
  border-radius: 24px;
  font-size: 15px;
  font-weight: 500;
  transition: background 0.15s;
}
.search-go:hover { background: var(--primary-dark); }

.hero-tags {
  display: flex; flex-wrap: wrap; gap: 8px; justify-content: center;
  align-items: center;
  font-size: 13px;
}
.tag-label { color: var(--text-muted); }
.hot-tag {
  padding: 4px 12px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 14px;
  color: var(--text-secondary);
  font-size: 13px;
  transition: all 0.15s;
}
.hot-tag:hover {
  border-color: var(--primary);
  color: var(--primary);
  background: var(--primary-light);
}

/* ============================================
   数据看板
   ============================================ */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-top: -60px;
  position: relative;
  z-index: 2;
}
.stat-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 24px;
  text-align: center;
  box-shadow: var(--shadow);
  border: 1px solid var(--border-light);
  transition: transform 0.2s, box-shadow 0.2s;
}
.stat-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-lg); }
.stat-num {
  font-size: 32px;
  font-weight: 700;
  color: var(--primary);
  line-height: 1.2;
  margin-bottom: 4px;
}
.stat-label { color: var(--text-muted); font-size: 14px; }

/* ============================================
   章节
   ============================================ */
.section { padding: 60px 0 20px; }
.section-head {
  text-align: center;
  margin-bottom: 32px;
}
.section-title {
  font-size: 28px;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--text);
}
.section-sub {
  color: var(--text-muted);
  font-size: 15px;
}

/* ============================================
   分类卡片网格
   ============================================ */
.cat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 16px;
}
.cat-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 24px 20px;
  text-align: center;
  border: 1px solid var(--border-light);
  cursor: pointer;
  transition: all 0.2s;
  position: relative;
  overflow: hidden;
}
.cat-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 4px;
  background: var(--cat-color, var(--primary));
  opacity: 0;
  transition: opacity 0.2s;
}
.cat-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
  border-color: var(--cat-color, var(--primary));
}
.cat-card:hover::before { opacity: 1; }
.cat-emoji { font-size: 32px; margin-bottom: 8px; }
.cat-name { font-size: 16px; font-weight: 600; margin-bottom: 4px; }
.cat-count { font-size: 13px; color: var(--text-muted); }

/* ============================================
   图表
   ============================================ */
.chart-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 32px;
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-sm);
}
#typeChart { width: 100%; height: auto; max-height: 300px; }

/* ============================================
   最近更新列表
   ============================================ */
.recent-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 12px;
}
.recent-item {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  padding: 14px 16px;
  display: flex;
  align-items: center;
  gap: 12px;
  cursor: pointer;
  transition: all 0.15s;
}
.recent-item:hover {
  border-color: var(--primary);
  transform: translateX(2px);
}
.recent-emoji { font-size: 22px; flex-shrink: 0; }
.recent-info { flex: 1; min-width: 0; }
.recent-title {
  font-size: 14px;
  font-weight: 500;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
  margin-bottom: 2px;
}
.recent-meta { font-size: 12px; color: var(--text-muted); }

/* ============================================
   功能特性
   ============================================ */
.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 24px;
}
.feature {
  text-align: center;
  padding: 24px 16px;
}
.feature-icon { font-size: 36px; margin-bottom: 12px; }
.feature h3 { font-size: 17px; font-weight: 600; margin-bottom: 8px; }
.feature p { color: var(--text-secondary); font-size: 14px; line-height: 1.6; }

/* ============================================
   浏览/搜索页
   ============================================ */
.page { display: none; }
.page.active { display: block; }

.explore-wrap {
  max-width: 1200px;
  margin: 0 auto;
  padding: 32px 24px;
}
.explore-search {
  position: relative;
  display: flex;
  align-items: center;
  background: var(--bg-card);
  border: 2px solid var(--border);
  border-radius: 32px;
  padding: 4px 16px 4px 20px;
  margin-bottom: 24px;
  box-shadow: var(--shadow);
  transition: all 0.2s;
}
.explore-search:focus-within {
  border-color: var(--primary);
  box-shadow: 0 0 0 4px rgba(24,144,255,0.15), var(--shadow);
}
.explore-search .search-icon { font-size: 18px; color: var(--text-muted); margin-right: 12px; }
.explore-search input {
  flex: 1; border: none; outline: none; background: transparent;
  font-size: 16px; color: var(--text);
  padding: 12px 0;
}
.clear-btn {
  border: none; background: transparent;
  color: var(--text-muted); font-size: 24px;
  width: 32px; height: 32px;
  display: none; cursor: pointer;
}
.clear-btn.show { display: block; }

.filter-row {
  display: flex; align-items: center; gap: 12px;
  margin-bottom: 16px;
  flex-wrap: wrap;
}
.filter-label {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  flex-shrink: 0;
}
.filter-tags { display: flex; flex-wrap: wrap; gap: 8px; }
.ftag {
  padding: 5px 14px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  color: var(--text-secondary);
  font-size: 13px;
  transition: all 0.15s;
}
.ftag:hover { border-color: var(--primary); color: var(--primary); }
.ftag.active {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}

.results-head { padding: 16px 0 8px; }
.result-count { font-size: 14px; color: var(--text-muted); }
.result-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 12px;
}

/* 资源卡片 */
.res-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius);
  padding: 16px 18px;
  cursor: pointer;
  transition: all 0.15s;
  position: relative;
}
.res-card:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow);
  transform: translateY(-1px);
}
.res-card-head {
  display: flex; align-items: center; gap: 10px;
  margin-bottom: 8px;
}
.res-emoji { font-size: 22px; flex-shrink: 0; }
.res-title {
  font-size: 15px; font-weight: 500;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  flex: 1;
}
.res-title em {
  background: #fff3a3;
  font-style: normal;
  padding: 0 2px;
  border-radius: 2px;
}
@media (prefers-color-scheme: dark) {
  .res-title em { background: #5a4a00; color: #fff; }
}
.res-meta {
  display: flex; gap: 6px; flex-wrap: wrap;
  font-size: 12px;
  margin-bottom: 6px;
}
.res-badge {
  padding: 2px 8px;
  background: var(--bg);
  color: var(--text-secondary);
  border-radius: 4px;
}
.res-badge.primary { background: var(--primary-light); color: var(--primary); }
.res-badge.video { background: rgba(245,34,45,0.1); color: var(--danger); }
.res-badge.audio { background: rgba(82,196,26,0.1); color: var(--accent); }
.res-badge.size { background: rgba(0,0,0,0.04); color: var(--text-muted); }
.res-path {
  font-size: 11px; color: var(--text-muted);
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}

.empty-state {
  grid-column: 1 / -1;
  text-align: center;
  padding: 60px 20px;
  color: var(--text-muted);
}
.empty-icon { font-size: 48px; opacity: 0.5; margin-bottom: 12px; }

.load-more {
  grid-column: 1 / -1;
  text-align: center;
  padding: 20px;
  color: var(--primary);
  font-size: 14px;
  cursor: pointer;
}
.load-more:hover { text-decoration: underline; }

/* ============================================
   详情弹层
   ============================================ */
.modal-mask {
  position: fixed; inset: 0;
  background: rgba(0,0,0,0.5);
  z-index: 200;
  display: none;
  align-items: center; justify-content: center;
  padding: 16px;
  animation: fadeIn 0.2s;
}
.modal-mask.show { display: flex; }
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
.modal {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  max-width: 640px;
  width: 100%;
  max-height: 88vh;
  overflow-y: auto;
  position: relative;
  box-shadow: var(--shadow-lg);
  animation: slideUp 0.25s;
}
@keyframes slideUp { from { transform: translateY(20px); opacity: 0; } to { transform: none; opacity: 1; } }
.modal-close {
  position: absolute; top: 12px; right: 12px;
  width: 36px; height: 36px;
  border: none; background: var(--bg);
  color: var(--text-secondary); font-size: 20px;
  border-radius: 18px;
  cursor: pointer;
  z-index: 2;
}
.modal-close:hover { background: var(--border); }
.modal-head {
  padding: 28px 24px 16px;
  display: flex; align-items: flex-start; gap: 12px;
  border-bottom: 1px solid var(--border-light);
}
.modal-emoji { font-size: 36px; flex-shrink: 0; line-height: 1; padding-top: 4px; }
.modal-head h2 {
  font-size: 18px; font-weight: 600;
  line-height: 1.4;
  flex: 1;
}
.modal-body { padding: 20px 24px 24px; }
.meta-table { width: 100%; border-collapse: collapse; margin-bottom: 16px; }
.meta-table tr { border-bottom: 1px solid var(--border-light); }
.meta-table tr:last-child { border-bottom: none; }
.meta-table td { padding: 10px 0; font-size: 14px; vertical-align: top; }
.meta-table td:first-child { color: var(--text-muted); width: 80px; }
.modal-tags { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 16px; }
.tag {
  padding: 3px 10px;
  background: var(--primary-light);
  color: var(--primary);
  border-radius: 10px;
  font-size: 12px;
}
.modal-path-wrap {
  background: var(--bg);
  border-radius: var(--radius-sm);
  padding: 12px 14px;
  margin-bottom: 16px;
}
.path-label {
  font-size: 12px; color: var(--text-muted);
  margin-bottom: 6px;
}
.modal-path {
  font-family: "SF Mono", Consolas, monospace;
  font-size: 12px;
  word-break: break-all;
  color: var(--text-secondary);
}
.modal-foot {
  padding: 12px 14px;
  background: rgba(245,34,45,0.04);
  border: 1px solid rgba(245,34,45,0.15);
  color: var(--danger);
  border-radius: var(--radius-sm);
  font-size: 13px;
  text-align: center;
}

/* ============================================
   关于页
   ============================================ */
.about-wrap {
  max-width: 800px;
  margin: 0 auto;
  padding: 60px 24px;
}
.about-wrap h1 { font-size: 32px; margin-bottom: 12px; }
.about-lead { font-size: 17px; color: var(--text-secondary); margin-bottom: 40px; }
.about-wrap h2 {
  font-size: 20px;
  margin: 32px 0 12px;
  padding-top: 8px;
}
.about-wrap p, .about-wrap li {
  color: var(--text-secondary);
  margin-bottom: 12px;
  font-size: 15px;
}
.about-wrap ul { padding-left: 24px; }

/* ============================================
   页脚
   ============================================ */
.footer {
  background: var(--bg-card);
  border-top: 1px solid var(--border-light);
  padding: 32px 0;
  margin-top: 60px;
}
.footer-inner {
  display: flex; justify-content: space-between; align-items: center;
  flex-wrap: wrap; gap: 12px;
  color: var(--text-muted);
  font-size: 14px;
}
.footer-meta { color: var(--text-muted); }

/* ============================================
   响应式
   ============================================ */
@media (max-width: 768px) {
  .container { padding: 0 16px; }
  .nav-inner { padding: 0 16px; height: 56px; }
  .brand-text { font-size: 16px; }
  .nav-link { padding: 6px 10px; font-size: 14px; }
  .hero { padding: 48px 16px 80px; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 12px; margin-top: -40px; }
  .stat-card { padding: 18px 12px; }
  .stat-num { font-size: 24px; }
  .section { padding: 40px 0 16px; }
  .section-title { font-size: 22px; }
  .cat-grid { grid-template-columns: repeat(2, 1fr); gap: 12px; }
  .cat-card { padding: 18px 12px; }
  .cat-emoji { font-size: 26px; }
  .features { grid-template-columns: 1fr; gap: 16px; }
  .feature { padding: 16px 8px; }
  .explore-wrap { padding: 20px 16px; }
  .result-grid { grid-template-columns: 1fr; }
  .about-wrap { padding: 40px 16px; }
  .about-wrap h1 { font-size: 26px; }
  .modal-head { padding: 20px 16px 12px; }
  .modal-body { padding: 16px; }
  .modal-head h2 { font-size: 16px; }
}

@media (max-width: 480px) {
  .hero-tags .tag-label { display: none; }
  .filter-row { gap: 8px; }
}




/* 用户菜单：沿用顶部导航风格 */
.user-menu { position: relative; display: inline-flex; align-items: center; }
.user-menu-trigger { border: 0; font: inherit; cursor: pointer; display: inline-flex; align-items: center; gap: 4px; }
.user-caret { font-size: 12px; color: var(--text-secondary); }
.user-menu-dropdown {
  display: none; position: absolute; right: 0; top: calc(100% + 8px); width: 180px; z-index: 200;
  background: var(--card-bg); border: 1px solid var(--border); border-radius: 12px;
  box-shadow: 0 12px 32px rgba(15,23,42,.14); padding: 6px;
}
.user-menu-dropdown.show { display: block; }
.user-menu-info { padding: 8px 10px 10px; border-bottom: 1px solid var(--border-light); margin-bottom: 4px; }
.user-menu-display { font-size: 14px; font-weight: 600; color: var(--text); }
.user-menu-role { margin-top: 2px; font-size: 12px; color: var(--text-secondary); }
.user-menu-tip { display: none; }
.user-menu-item { width: 100%; border: 0; background: transparent; color: var(--text-secondary); text-align: left; padding: 8px 10px; border-radius: 8px; cursor: pointer; font-size: 14px; }
.user-menu-item:hover { background: var(--bg); color: var(--text); }
.user-menu-item.danger { color: var(--text-secondary); }
.user-menu-item.danger:hover { background: var(--danger); color: #fff; }
.account-modal { display: none; position: fixed; inset: 0; z-index: 300; background: rgba(15,23,42,.38); align-items: center; justify-content: center; padding: 20px; }
.account-modal.show { display: flex; }
.account-modal-card { position: relative; width: min(420px, 100%); background: var(--card-bg); border-radius: 16px; border: 1px solid var(--border); box-shadow: 0 20px 56px rgba(15,23,42,.22); padding: 22px; }
.account-modal-card h3 { margin: 0 0 8px; }
.account-modal-desc { margin: 0 0 14px; color: var(--text-secondary); font-size: 14px; }
.account-modal-close { position: absolute; right: 14px; top: 12px; border: 0; background: transparent; font-size: 24px; cursor: pointer; color: var(--text-secondary); }
.account-modal-card input { width: 100%; box-sizing: border-box; margin: 7px 0; padding: 11px 12px; border: 1px solid var(--border); border-radius: 10px; background: var(--bg); color: var(--text); }
.account-modal-actions { display: flex; gap: 10px; margin-top: 12px; }
.account-modal-actions button { flex: 1; padding: 10px 12px; border-radius: 10px; border: 0; cursor: pointer; }
.account-primary { background: var(--primary); color: white; }
.account-secondary { background: var(--bg); color: var(--text); }
.account-msg { min-height: 18px; margin-top: 10px; font-size: 13px; color: var(--text-secondary); }
.account-msg.error { color: #dc2626; }
.account-msg.ok { color: #16a34a; }
.help-list { margin: 8px 0 0; padding-left: 20px; color: var(--text); line-height: 1.8; }
@media(max-width: 640px) { .user-menu-dropdown { right: -8px; width: 180px; } }


/* 用户菜单瘦身覆盖：只作为退出入口的扩展，不抢页面视觉 */
.user-menu-trigger { padding: 8px 14px; min-width: auto; box-shadow: none !important; }
.user-name { max-width: 4em; }
.user-menu-dropdown { width: 132px !important; padding: 4px !important; border-radius: 10px !important; box-shadow: 0 8px 22px rgba(15,23,42,.12) !important; top: calc(100% + 6px) !important; }
.user-menu-info { display: none !important; }
.user-menu-item { padding: 8px 10px !important; font-size: 13px !important; white-space: nowrap; }
.account-modal-card { box-shadow: 0 16px 42px rgba(15,23,42,.18) !important; }


/* 用户菜单最终修正：顶部只显示“用户”，下拉承载用户信息 */
.user-name { max-width: none !important; }
.user-menu-dropdown { width: 148px !important; }
.user-menu-info { display: block !important; padding: 6px 8px 8px !important; margin-bottom: 3px !important; border-bottom: 1px solid var(--border-light) !important; }
.user-menu-display { font-size: 12px !important; font-weight: 600 !important; color: var(--text) !important; line-height: 1.3; }
.user-menu-role { margin-top: 1px !important; font-size: 11px !important; color: var(--text-secondary) !important; }


/* 移动端导航修正：手机只保留品牌、年级、用户，避免桌面导航挤爆 */
@media (max-width: 640px) {
  .nav-inner { height: 48px !important; padding: 0 10px !important; gap: 8px !important; }
  .brand { flex: 0 0 auto !important; gap: 6px !important; font-size: 13px !important; }
  .brand-icon { font-size: 16px !important; }
  .brand-text { font-size: 12px !important; max-width: 72px !important; overflow: hidden !important; text-overflow: ellipsis !important; white-space: nowrap !important; }
  .nav-links { margin-left: auto !important; gap: 4px !important; align-items: center !important; flex: 0 0 auto !important; }
  .nav-links > a.nav-link[data-page] { display: none !important; }
  .grade-btn, .user-menu-trigger { height: 32px !important; padding: 6px 8px !important; font-size: 12px !important; border-radius: 8px !important; }
  .user-menu-dropdown { right: 0 !important; top: calc(100% + 6px) !important; width: 132px !important; }
  .user-menu-info { display: none !important; }
  .user-menu-item { font-size: 13px !important; padding: 8px 10px !important; }
  .hero { padding-top: 56px !important; }
  html, body { max-width: 100% !important; overflow-x: hidden !important; }
}


/* 顶部导航统一：字体、背景、高度、垂直居中统一 */
.topnav .nav-inner { align-items: center !important; }
.topnav .nav-links { align-items: center !important; }
.topnav .nav-link,
.topnav .grade-btn,
.topnav .user-menu-trigger {
  height: 36px !important;
  box-sizing: border-box !important;
  display: inline-flex !important;
  align-items: center !important;
  justify-content: center !important;
  gap: 4px !important;
  padding: 0 12px !important;
  border-radius: 9px !important;
  font-size: 14px !important;
  font-weight: 500 !important;
  line-height: 1 !important;
  color: var(--text-secondary) !important;
  background: transparent !important;
  border: 1px solid transparent !important;
  box-shadow: none !important;
  vertical-align: middle !important;
}
.topnav .nav-link:hover,
.topnav .grade-btn:hover,
.topnav .user-menu-trigger:hover {
  background: var(--bg) !important;
  color: var(--text) !important;
}
.topnav .nav-link.active {
  background: var(--primary-light) !important;
  color: var(--primary) !important;
}
.topnav .grade-btn .caret,
.topnav .user-caret { line-height: 1 !important; transform: translateY(-1px); }
@media (max-width: 640px) {
  .topnav .nav-link,
  .topnav .grade-btn,
  .topnav .user-menu-trigger {
    height: 32px !important;
    padding: 0 8px !important;
    font-size: 12px !important;
    border-radius: 8px !important;
  }
  .topnav .brand { height: 32px !important; display: inline-flex !important; align-items: center !important; }
  .topnav .brand-icon, .topnav .brand-text { line-height: 1 !important; }
}


.download-panel { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
.download-btn { display: inline-flex; align-items: center; justify-content: center; min-height: 42px; padding: 0 18px; border-radius: 999px; background: #1677ff; color: #fff; font-weight: 700; text-decoration: none; box-shadow: 0 8px 20px rgba(22,119,255,.22); }
.download-btn:hover { background: #0958d9; color: #fff; }
.download-hint { color: #667085; font-size: 13px; flex: 1; min-width: 180px; }
@media (max-width: 640px) { .download-panel { align-items: stretch; } .download-btn { width: 100%; } .download-hint { width: 100%; text-align: center; } }