/* Navigation Module CSS v3 - 完整重写 */
:root {
  --nav-accent: #1a73e8;
  --nav-accent-hover: #1765d4;
  --nav-bg: #fff;
  --nav-surface: #fafafa;
  --nav-border: #e8e8e8;
  --nav-text: #202124;
  --nav-text-muted: #5f6368;
  --nav-radius: 6px;
  --nav-radius-lg: 12px;
  --nav-shadow: 0 1px 3px rgba(0,0,0,0.08);
  --nav-shadow-md: 0 4px 12px rgba(0,0,0,0.10);
  --nav-font: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
}

/* =============================================================
   Archive / List Page (archive-nav_site.php)
   ============================================================= */
.nav-archive-wrap {
  max-width: 1280px;
  margin: 0 auto;
  padding: 1rem;
  font-family: var(--nav-font);
}
.nav-layout { display: flex; gap: 24px; align-items: flex-start; }
.nav-sidebar { width: 220px; flex-shrink: 0; position: sticky; top: 20px; }
.nav-sidebar-section {
  background: var(--nav-bg);
  border: 1px solid var(--nav-border);
  border-radius: var(--nav-radius-lg);
  padding: 16px;
  margin-bottom: 16px;
  box-shadow: var(--nav-shadow);
}
.nav-sidebar-title {
  font-size: 0.8125rem; font-weight: 700;
  color: var(--nav-text);
  margin: 0 0 12px; padding-bottom: 10px;
  border-bottom: 2px solid var(--nav-border);
  display: flex; align-items: center; gap: 8px;
  text-transform: uppercase; letter-spacing: 0.05em;
}
.nav-quick-links { display: flex; flex-direction: column; gap: 4px; }
.nav-quick-link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 10px;
  border-radius: var(--nav-radius);
  text-decoration: none;
  color: var(--nav-text-muted);
  font-size: 0.875rem;
  cursor: pointer;
  border: none;
  background: none;
  width: 100%;
  text-align: left;
  transition: all 0.2s;
  font-family: inherit;
}
.nav-quick-link:hover { background: var(--nav-surface); color: var(--nav-accent); }
.nav-quick-link.active { background: var(--nav-accent); color: #fff; }
.nav-quick-icon {
  width: 28px; height: 28px;
  border-radius: 50%;
  background: var(--nav-surface);
  display: flex; align-items: center; justify-content: center;
  font-size: 0.875rem;
  flex-shrink: 0;
}
.nav-quick-link.active .nav-quick-icon { background: rgba(255,255,255,0.2); }
.nav-quick-count {
  margin-left: auto;
  font-size: 0.75rem;
  background: var(--nav-surface);
  padding: 2px 8px;
  border-radius: 9999px;
  color: var(--nav-text-muted);
}
.nav-quick-link.active .nav-quick-count { background: rgba(255,255,255,0.2); color: #fff; }
.nav-cat-list { list-style: none; padding: 0; margin: 0; }
.nav-cat-list li { margin: 0; }
.nav-cat-list .cat-has-children { }
.nav-cat-list .cat-parent-row {
    display: flex; align-items: center; gap: 6px;
    padding: 8px 12px; cursor: pointer;
    color: var(--nav-text); text-decoration: none;
    border-radius: var(--nav-radius);
    transition: background 0.15s;
}
.nav-cat-list .cat-parent-row:hover { background: var(--nav-surface); color: var(--nav-accent); }
.nav-cat-list .cat-toggle-icon { font-size: 16px !important; color: var(--nav-text-muted) !important; flex-shrink: 0; width: 20px; text-align: center; line-height: 1; }
.nav-cat-list .cat-name { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.nav-cat-list .cat-children { list-style: none; padding: 0 0 4px 28px; margin: 0; }
.nav-cat-list .cat-child-item a {
    display: flex !important;
    align-items: center !important;
    justify-content: space-between !important;
    gap: 6px;
    padding: 6px 12px; color: var(--nav-text) !important; text-decoration: none !important;
    border-radius: var(--nav-radius); font-size: 0.8125rem;
    transition: background 0.15s;
}
.nav-cat-list .cat-child-item a:hover { background: var(--nav-surface); color: var(--nav-accent); }
.nav-cat-list .cat-child-item.cat-active > a { color: var(--nav-accent); font-weight: 500; }
.nav-cat-list .cat-child-name { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.nav-cat-list a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 10px;
  border-radius: var(--nav-radius);
  text-decoration: none;
  color: var(--nav-text);
  font-size: 0.875rem;
  transition: all 0.2s;
}
.nav-cat-list a:hover { background: var(--nav-surface); color: var(--nav-accent); }
.nav-cat-list a.active {
  background: var(--nav-accent); color: #fff;
  box-shadow: 0 2px 8px rgba(26,115,232,0.30);
}
.nav-cat-list .cat-count {
  font-size: 0.6875rem; font-weight: 600;
  color: var(--nav-text-muted); background: #f0f4f8;
  padding: 2px 8px; border-radius: 9999px;
}
.nav-cat-list a.active .cat-count { background: rgba(255,255,255,0.2); color: #fff; }
.nav-main { flex: 1; min-width: 0; }
.nav-main-header { margin-bottom: 1.5rem; text-align: center; }
.nav-main-header h1 {
  font-size: 1.5rem; font-weight: 700; margin: 0 0 8px;
  color: var(--nav-text); text-align: center;
  letter-spacing: -0.01em;
}
.nav-main-count {
  font-size: 0.8125rem; color: var(--nav-text-muted); margin: 0; text-align: center;
  background: var(--nav-surface); display: inline-block;
  padding: 4px 16px; border-radius: 9999px; border: 1px solid var(--nav-border);
}
.nav-archive-header { margin-bottom: 1.5rem; text-align: center; padding: 1.5rem; background: var(--nav-surface); border-radius: var(--nav-radius-lg); border: 1px solid var(--nav-border); }
.nav-archive-header h1 { font-size: 1.5rem; font-weight: 700; margin: 0 0 8px; color: var(--nav-text); text-align: center; letter-spacing: -0.01em; }
.nav-archive-header p { font-size: 0.875rem; color: var(--nav-text-muted); margin: 0; text-align: center; }

/* Card grid */
.nav-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}
@media (max-width: 1100px) { .nav-grid { grid-template-columns: repeat(3, 1fr); } .nav-related-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 768px) { .nav-grid { grid-template-columns: repeat(2, 1fr); } .nav-related-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 480px) { .nav-grid { grid-template-columns: repeat(2, 1fr); } .nav-related-grid { grid-template-columns: repeat(2, 1fr); } }

.nav-card {
  background: var(--nav-bg);
  border: 1px solid var(--nav-border);
  border-radius: var(--nav-radius-lg);
  overflow: hidden;
  transition: all 0.2s;
  position: relative;
  display: flex;
  flex-direction: column;
  height: 100%;
}
.nav-card:hover { box-shadow: var(--nav-shadow-md); border-color: var(--nav-accent); transform: translateY(-2px); }
.nav-card-badge { position: absolute; top: 4px; right: 4px; font-size: 14px; z-index: 10; }
.nav-card-main { display: flex; padding: 12px; gap: 12px; text-decoration: none; color: inherit; flex: 1; }
.nav-card-media {
  flex-shrink: 0;
  position: relative;
  width: 56px; height: 56px;
  border-radius: var(--nav-radius);
  overflow: hidden;
  background: var(--nav-surface);
  display: flex; align-items: center; justify-content: center;
  border: 1px solid var(--nav-border);
}
.nav-card-media .blur-bg {
  position: absolute; top: -50%; left: -50%; width: 200%; height: 200%;
  background-size: cover; background-position: center;
  filter: blur(15px); opacity: 0.25; z-index: 0;
}
.nav-card-img {
  position: relative; z-index: 1;
  width: 40px; height: 40px;
  object-fit: contain;
  transition: transform 0.25s ease;
}
.nav-card:hover .nav-card-img { transform: scale(1.08); }
.nav-card-letter { position: relative; z-index: 1; font-size: 22px; font-weight: 600; color: var(--nav-accent); text-transform: uppercase; }
.nav-card-body { flex: 1; min-width: 0; display: flex; flex-direction: column; justify-content: center; }
.nav-card-title {
  font-size: 0.9375rem; font-weight: 600;
  margin: 0 0 5px;
  color: var(--nav-text);
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
  line-height: 1.3;
}
.nav-card-title b { font-weight: 600; }
.nav-card-desc {
  font-size: 0.8125rem; color: var(--nav-text-muted); margin: 0;
  display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical;
  overflow: hidden; line-height: 1.5;
}
.nav-card-footer {
  display: flex; align-items: center;
  flex-wrap: nowrap;
  padding: 10px 12px 10px;
  border-top: 1px solid var(--nav-border); margin-top: auto;
  background: var(--nav-surface);
  gap: 8px;
  overflow: hidden;
  min-height: 42px;
  box-sizing: border-box;
}
.nav-card-tags {
  flex: 1 1 0;
  min-width: 0;
  display: flex; gap: 4px;
  flex-wrap: nowrap;
  align-items: center;
  overflow: hidden;
  list-style: none; padding: 0; margin: 0;
}
.nav-card-tag {
  flex-shrink: 0;
  font-size: 0.6875rem;
  background: #f0f4f8; color: #5f6368;
  padding: 3px 9px; border-radius: 9999px;
  border: 1px solid #e0e4e8;
  text-decoration: none; transition: all 0.2s;
  white-space: nowrap;
  line-height: 1.4;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 120px;
}
.nav-card-tag:hover { background: var(--nav-accent); color: #fff; border-color: var(--nav-accent); }
.nav-card-tag.tag-cat { background: #e8f0fd; color: var(--nav-accent); border-color: #c5d9fa; }
.nav-card-tag.tag-cat:hover { background: var(--nav-accent); color: #fff; border-color: var(--nav-accent); }
.nav-card-togo {
  flex-shrink: 0;
  display: flex; align-items: center; justify-content: center;
  width: 28px; height: 28px;
  border-radius: 50%;
  background: #f0f4f8;
  border: 1px solid #e0e4e8;
  color: var(--nav-text-muted);
  text-decoration: none; transition: all 0.2s;
}
.nav-card-togo:hover { background: var(--nav-accent); color: #fff; border-color: var(--nav-accent); box-shadow: 0 2px 8px rgba(26,115,232,0.35); }
.nav-card-togo svg { width: 13px; height: 13px; }
.nav-pagination { margin-top: 3rem; text-align: center; }
.nav-pagination a, .nav-pagination span {
  display: inline-flex; align-items: center; justify-content: center;
  min-width: 38px; height: 38px;
  padding: 0 12px;
  margin: 0 3px;
  border: 1px solid var(--nav-border);
  border-radius: 50px;
  text-decoration: none; color: var(--nav-text-muted);
  font-size: 0.875rem; font-weight: 500;
  transition: all 0.2s;
  box-shadow: 0 1px 3px rgba(0,0,0,0.04);
}
.nav-pagination a:hover { border-color: var(--nav-accent); color: var(--nav-accent); box-shadow: 0 2px 8px rgba(26,115,232,0.15); }
.nav-pagination .current, .nav-pagination .active {
  background: var(--nav-accent); color: #fff; border-color: var(--nav-accent);
  box-shadow: 0 2px 8px rgba(26,115,232,0.30);
}
.nav-empty { text-align: center; padding: 4rem 0; color: var(--nav-text-muted); }

/* =============================================================
   Detail Page (single-nav_site.php)
   ============================================================= */
.nav-breadcrumb { max-width: 1280px; margin: 0 auto; padding: 1rem 1rem 0; font-size: 0.875rem; color: var(--nav-text-muted); display: flex; align-items: center; flex-wrap: wrap; gap: 0; overflow: hidden; }
.nav-breadcrumb a { color: var(--nav-accent); text-decoration: none; white-space: nowrap; }
.nav-breadcrumb a:hover { text-decoration: underline; }
.nav-breadcrumb .sep { margin: 0 8px; color: var(--nav-border); flex-shrink: 0; }
.nav-breadcrumb .current { color: var(--nav-text); font-weight: 500; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; max-width: 200px; }
@media (max-width: 480px) {
  .nav-breadcrumb { font-size: 0.75rem; padding: 0.75rem 0.5rem 0; }
  .nav-breadcrumb .current { max-width: 120px; }
}
.nav-single-wrap { max-width: 1080px; margin: 0 auto; padding: 2rem 1rem; font-family: var(--nav-font); }
.nav-single-header {
  background: linear-gradient(135deg, var(--nav-surface) 0%, var(--nav-bg) 100%);
  border-radius: var(--nav-radius-lg);
  padding: 28px 32px;
  margin-bottom: 2rem;
  border: 1px solid var(--nav-border);
  box-shadow: 0 4px 16px rgba(0,0,0,0.06);
}
.nav-single-header-inner { display: flex; align-items: center; gap: 24px; }
.nav-single-logo {
  width: 80px; height: 80px;
  border-radius: var(--nav-radius-lg);
  overflow: hidden;
  background: var(--nav-bg);
  border: 1px solid var(--nav-border);
  display: flex; align-items: center; justify-content: center;
  padding: 10px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.08);
  flex-shrink: 0;
  transition: box-shadow 0.2s;
}
.nav-single-logo:hover { box-shadow: 0 6px 20px rgba(0,0,0,0.12); }
.nav-single-logo img { max-width: 100%; max-height: 100%; object-fit: contain; }
.nav-single-logo-letter { font-size: 32px; font-weight: 700; color: var(--nav-accent); text-transform: uppercase; }
.nav-single-main { flex: 1; min-width: 0; }
.nav-single-name {
  font-size: 1.75rem; font-weight: 700;
  margin: 0 0 10px;
  display: flex; align-items: center; gap: 12px; flex-wrap: wrap;
  line-height: 1.25;
  color: var(--nav-text);
  letter-spacing: -0.02em;
}
.nav-single-badge { display: inline-flex; align-items: center; background: linear-gradient(135deg, #ffd700, #ffaa00); color: #333; font-size: 0.6875rem; font-weight: 700; padding: 4px 12px; border-radius: 12px; box-shadow: 0 2px 6px rgba(255,170,0,0.30); }
.seo-weight-row { margin-top: 10px; min-height: 22px; display: flex; align-items: center; flex-wrap: wrap; gap: 6px; }
.seo-capsule { display: inline-flex; align-items: center; border-radius: 12px; overflow: hidden; box-shadow: var(--nav-shadow); }
.seo-capsule-left { background: var(--nav-bg); padding: 3px 8px; font-size: 0.6875rem; color: var(--nav-text-muted); font-weight: 500; }
.seo-capsule-right { padding: 3px 10px; color: #fff; font-weight: 700; font-size: 0.75rem; }
.nav-single-actions { display: flex; gap: 10px; align-items: center; flex-shrink: 0; }
.nav-btn { display: inline-flex; align-items: center; gap: 6px; padding: 10px 18px; border-radius: 10px; text-decoration: none; font-size: 0.875rem; font-weight: 500; cursor: pointer; border: none; font-family: inherit; transition: all 0.25s; white-space: nowrap; }
.nav-btn-primary { background: linear-gradient(135deg, var(--nav-accent), #1557b0); color: #fff; box-shadow: 0 4px 12px rgba(26,115,232,0.30); }
.nav-btn-primary:hover { background: linear-gradient(135deg, var(--nav-accent-hover), #134aa0); color: #fff; transform: translateY(-1px); }
.nav-btn-secondary { background: var(--nav-bg); color: var(--nav-text-muted); border: 1px solid var(--nav-border); }
.nav-btn-secondary:hover { border-color: var(--nav-accent); color: var(--nav-accent); }
.nav-btn-secondary.active, .nav-btn-secondary.active #favIcon { background: #fff0f3; border-color: #ff6b81; color: #ff6b81; }
.nav-btn-icon { padding: 10px 12px; font-size: 1rem; }
.nav-btn-icon #favText { font-size: 0.8125rem; }
.nav-single-meta-row { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 16px; padding-top: 16px; border-top: 1px solid var(--nav-border); align-items: center; }
.nav-single-meta-group { display: flex; flex-wrap: wrap; gap: 6px; }
.nav-single-meta-tag { display: inline-flex; align-items: center; gap: 4px; padding: 4px 10px; background: var(--nav-surface); border: 1px solid var(--nav-border); border-radius: 9999px; font-size: 0.8125rem; color: var(--nav-text-muted); text-decoration: none; transition: all 0.2s; }
.nav-single-meta-tag:hover { border-color: var(--nav-accent); color: var(--nav-accent); }
.nav-single-meta-tag.cat-tag { background: #e8f4fd; color: var(--nav-accent); border-color: #cce5ff; }
.nav-single-meta-tag.cat-tag:hover { background: var(--nav-accent); color: #fff; }
.nav-screenshot-section { margin-bottom: 2rem; border-radius: var(--nav-radius); overflow: hidden; box-shadow: var(--nav-shadow-md); border: 1px solid var(--nav-border); background: var(--nav-surface); }
.nav-screenshot-section img { width: 100%; height: auto; display: block; }
.nav-info-block {
  margin-bottom: 2rem;
  background: var(--nav-bg);
  border-radius: var(--nav-radius-lg);
  padding: 1.5rem;
  border: 1px solid var(--nav-border);
  box-shadow: var(--nav-shadow);
}
.nav-info-block h3 {
  font-size: 0.9375rem; font-weight: 700; margin: 0 0 1rem;
  color: var(--nav-text);
  padding-bottom: 10px; border-bottom: 2px solid var(--nav-border);
  display: flex; align-items: center; gap: 8px;
  text-transform: uppercase; letter-spacing: 0.04em;
}
.nav-info-block .content { font-size: 0.9375rem; line-height: 1.75; color: var(--nav-text); }
.nav-keywords { display: flex; flex-wrap: wrap; gap: 6px; }
.nav-keyword {
  padding: 4px 12px;
  background: linear-gradient(135deg, #f0f4f8, #fafafa);
  border: 1px solid var(--nav-border);
  border-radius: 9999px;
  font-size: 0.8125rem; color: var(--nav-text-muted);
  transition: all 0.2s;
}
.nav-keyword:hover { background: var(--nav-accent); color: #fff; border-color: var(--nav-accent); }
.nav-article {
  margin-bottom: 2rem;
  background: var(--nav-bg);
  border-radius: var(--nav-radius-lg);
  padding: 1.5rem;
  border: 1px solid var(--nav-border);
  line-height: 1.75;
  box-shadow: var(--nav-shadow);
}
.nav-article h3 {
  font-size: 0.9375rem; font-weight: 700; margin: 0 0 1rem;
  color: var(--nav-text);
  padding-bottom: 10px; border-bottom: 2px solid var(--nav-border);
  display: flex; align-items: center; gap: 8px;
  text-transform: uppercase; letter-spacing: 0.04em;
}
.nav-article p { margin: 0 0 0.75rem; font-size: 0.9375rem; color: var(--nav-text); }
.nav-article ol, .nav-article ul { margin: 0.5rem 0; padding-left: 1.5rem; }
.nav-article li { margin-bottom: 0.25rem; font-size: 0.9375rem; }
.nav-article strong { font-weight: 600; color: var(--nav-text); }
.nav-rating-section {
  margin-bottom: 2rem;
  padding: 1.5rem 1.75rem;
  background: linear-gradient(135deg, #f0f6ff 0%, #fafafa 100%);
  border-radius: var(--nav-radius-lg);
  border: 1px solid #dce8fb;
  box-shadow: var(--nav-shadow);
}
.nav-rating-header { display: flex; align-items: center; gap: 1rem; margin-bottom: 1rem; }
.nav-rating-score { font-size: 2.5rem; font-weight: 700; color: var(--nav-accent); line-height: 1; }
.nav-rating-stars { display: flex; gap: 4px; font-size: 1.25rem; margin-bottom: 4px; }
.nav-rating-stars .star { color: #ffc107; }
.nav-rating-stars .star.empty { color: var(--nav-border); }
.nav-rating-count { font-size: 0.875rem; color: var(--nav-text-muted); }
.nav-rating-action { margin-top: 1rem; padding-top: 1rem; border-top: 1px solid var(--nav-border); }
.nav-rating-label { font-size: 0.9375rem; color: var(--nav-text); margin-bottom: 0.5rem; }
.nav-rating-input { display: flex; gap: 8px; font-size: 2rem; }
.nav-rating-input .star-btn { background: none; border: none; cursor: pointer; color: var(--nav-border); transition: color 0.2s; padding: 0; font-size: inherit; }
.nav-rating-input .star-btn:hover, .nav-rating-input .star-btn.active { color: #ffc107; }
.nav-rating-message { margin-top: 0.5rem; font-size: 0.875rem; color: var(--nav-text-muted); }
.nav-rating-message.success { color: #00a32a; }
.nav-related-section { margin-bottom: 2rem; }
.nav-related-title {
  font-size: 0.9375rem; font-weight: 700;
  margin: 0 0 1rem; color: var(--nav-text);
  padding-bottom: 10px; border-bottom: 2px solid var(--nav-border);
  text-transform: uppercase; letter-spacing: 0.04em;
}
.nav-related-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; }
.nav-related-card {
  display: flex; align-items: center; gap: 10px;
  padding: 14px 12px;
  border: 1px solid var(--nav-border);
  border-radius: var(--nav-radius);
  background: var(--nav-bg);
  text-decoration: none; color: var(--nav-text);
  transition: all 0.2s; overflow: hidden; width: 100%; box-sizing: border-box;
  box-shadow: var(--nav-shadow);
}
.nav-related-card:hover { border-color: var(--nav-accent); transform: translateY(-2px); box-shadow: var(--nav-shadow-md); }
.nav-related-logo { width: 40px; height: 40px; border-radius: var(--nav-radius); overflow: hidden; flex-shrink: 0; display: flex; align-items: center; justify-content: center; background: var(--nav-surface); }
.nav-related-logo img { width: 100%; height: 100%; object-fit: contain; }
.nav-related-letter { font-size: 16px; font-weight: 700; color: var(--nav-accent); }
.nav-related-name { font-size: 0.8125rem; font-weight: 500; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; flex-shrink: 1; min-width: 0; max-width: 100%; }
.nav-footer-bar { text-align: center; padding: 1rem; color: var(--nav-text-muted); font-size: 0.8125rem; border-top: 1px solid var(--nav-border); margin-top: 2rem; }
.nav-toast-container { position: fixed; bottom: 24px; right: 24px; z-index: 9999; display: flex; flex-direction: column; gap: 8px; }
.nav-back-to-top { position: fixed; bottom: 24px; right: 24px; width: 44px; height: 44px; border-radius: 50%; background: var(--nav-bg); border: 1px solid var(--nav-border); box-shadow: var(--nav-shadow); cursor: pointer; font-size: 1.25rem; color: var(--nav-text-muted); display: none; align-items: center; justify-content: center; transition: all 0.2s; z-index: 999; font-family: inherit; }
.nav-back-to-top:hover { background: var(--nav-accent); color: #fff; border-color: var(--nav-accent); }
.nav-back-to-top.visible { display: flex; }

/* Modals */
.qr-overlay, .nav-share-overlay { display: none; position: fixed; top: 0; left: 0; right: 0; bottom: 0; background: rgba(0,0,0,0.5); z-index: 9999; justify-content: center; align-items: center; }
.qr-overlay.active, .nav-share-overlay.active { display: flex; }
.qr-modal, .nav-share-modal { background: var(--nav-bg); border-radius: var(--nav-radius-lg); padding: 2rem; text-align: center; max-width: 320px; width: 90%; border: 1px solid var(--nav-border); }
.nav-share-modal { max-width: 360px; }
.qr-modal h4, .nav-share-title { font-size: 1rem; margin: 0 0 1rem; color: var(--nav-text); }
.nav-share-title { font-size: 1.125rem; font-weight: 600; margin-bottom: 1.5rem; }
.qr-modal img { width: 200px; height: 200px; margin: 0 auto 1rem; display: block; }
.qr-modal p { margin: 0; font-size: 0.875rem; color: var(--nav-text-muted); }
.nav-share-buttons { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1rem; margin-bottom: 1.5rem; }
.nav-share-btn { display: flex; flex-direction: column; align-items: center; gap: 6px; padding: 0.5rem; border: 1px solid var(--nav-border); border-radius: var(--nav-radius); background: var(--nav-surface); cursor: pointer; transition: all 0.2s; font-family: inherit; }
.nav-share-btn:hover { border-color: var(--nav-accent); background: var(--nav-bg); }
.nav-share-icon { font-size: 24px; }
.nav-share-label { font-size: 0.75rem; color: var(--nav-text-muted); }
.nav-share-close { padding: 10px 24px; border: 1px solid var(--nav-border); border-radius: var(--nav-radius); background: var(--nav-bg); color: var(--nav-text); cursor: pointer; font-size: 0.9375rem; font-family: inherit; width: 100%; }
.nav-share-close:hover { border-color: var(--nav-accent); color: var(--nav-accent); }

/* =============================================================
   Dark Mode (theme attribute: [data-theme="dark"])
   ============================================================= */
[data-theme="dark"] {
  --nav-bg: #1e1e1e;
  --nav-surface: #252525;
  --nav-border: #333;
  --nav-text: #e8e8e8;
  --nav-text-muted: #888;
  --nav-accent: #4dabf7;
  --nav-accent-bg: rgba(77,171,247,0.1);
  --nav-quick-icon-bg: #2d2d2d;
  --nav-tag-bg: #252525;
  --nav-tag-border: #333;
  --nav-tag-color: #888;
  --nav-cat-count-bg: #2d2d2d;
  --nav-card-togo-bg: #252525;
  --nav-card-togo-border: #333;
  --nav-pagination-bg: #2d2d2d;
  --nav-pagination-border: #333;
  --nav-active-accent: #4dabf7;
  --nav-active-accent-text: #1a1a1a;
  --nav-cat-tag-bg: #1a3a5c;
  --nav-cat-tag-border: #2a5a8c;
  --nav-cat-tag-color: #4dabf7;
  --nav-fav-active-bg: #3d2525;
  --nav-fav-active-color: #ff6b81;
}
[data-theme="dark"] .nav-sidebar-section { background: #1e1e1e; border-color: #333; }
[data-theme="dark"] .nav-sidebar-title { color: #e8e8e8; border-color: #333; }
[data-theme="dark"] .nav-cat-list a { color: #c0c0c0; }
[data-theme="dark"] .nav-cat-list a:hover { background: #2d2d2d; color: var(--nav-accent); }
[data-theme="dark"] .nav-cat-list a.active { background: var(--nav-accent); color: var(--nav-active-accent-text); }
[data-theme="dark"] .nav-cat-list .cat-count { background: var(--nav-cat-count-bg); color: #888; }
[data-theme="dark"] .nav-cat-list a.active .cat-count { background: rgba(0,0,0,0.15); color: var(--nav-active-accent-text); }
[data-theme="dark"] .nav-quick-link { color: #c0c0c0; }
[data-theme="dark"] .nav-quick-link:hover { background: #2d2d2d; }
[data-theme="dark"] .nav-quick-link.active { background: var(--nav-accent); color: var(--nav-active-accent-text); }
[data-theme="dark"] .nav-quick-icon { background: var(--nav-quick-icon-bg); }
[data-theme="dark"] .nav-quick-link.active .nav-quick-icon { background: rgba(0,0,0,0.15); }
[data-theme="dark"] .nav-quick-count { background: var(--nav-cat-count-bg); color: #888; }
[data-theme="dark"] .nav-quick-link.active .nav-quick-count { background: rgba(0,0,0,0.15); color: var(--nav-active-accent-text); }
[data-theme="dark"] .nav-card { background: var(--nav-bg); border-color: var(--nav-border); }
[data-theme="dark"] .nav-card:hover { border-color: var(--nav-accent); }
[data-theme="dark"] .nav-card-media { background: var(--nav-surface); }
[data-theme="dark"] .nav-card-title { color: var(--nav-text); }
[data-theme="dark"] .nav-card-desc { color: var(--nav-text-muted); }
[data-theme="dark"] .nav-card-footer { border-color: var(--nav-border); }
[data-theme="dark"] .nav-card-tags { }
[data-theme="dark"] .nav-card-tag { background: var(--nav-tag-bg); border-color: var(--nav-tag-border); color: var(--nav-tag-color); }
[data-theme="dark"] .nav-card-tag:hover { background: var(--nav-accent); color: var(--nav-active-accent-text); }
[data-theme="dark"] .nav-card-tag.tag-cat { background: var(--nav-cat-tag-bg); color: var(--nav-cat-tag-color); border-color: var(--nav-cat-tag-border); }
[data-theme="dark"] .nav-card-tag.tag-cat:hover { background: var(--nav-accent); color: var(--nav-active-accent-text); }
[data-theme="dark"] .nav-card-togo { background: var(--nav-card-togo-bg); border-color: var(--nav-card-togo-border); color: var(--nav-text-muted); }
[data-theme="dark"] .nav-card-togo:hover { background: var(--nav-accent); color: var(--nav-active-accent-text); border-color: var(--nav-accent); }
[data-theme="dark"] .nav-pagination a { background: var(--nav-pagination-bg); border-color: var(--nav-pagination-border); color: var(--nav-accent); }
[data-theme="dark"] .nav-pagination a:hover { background: var(--nav-accent); color: var(--nav-active-accent-text); }
[data-theme="dark"] .nav-pagination .current, [data-theme="dark"] .nav-pagination .active { background: var(--nav-accent); color: var(--nav-active-accent-text); }
[data-theme="dark"] .nav-main-header h1 { color: var(--nav-text); }
[data-theme="dark"] .nav-empty { color: var(--nav-text-muted); }
[data-theme="dark"] .nav-single-header { background: var(--nav-surface); border-color: var(--nav-border); }
[data-theme="dark"] .nav-single-logo { background: var(--nav-cat-count-bg); border-color: var(--nav-border); }
[data-theme="dark"] .nav-single-name { color: var(--nav-text); }
[data-theme="dark"] .nav-btn-secondary { background: var(--nav-cat-count-bg); border-color: var(--nav-border); color: #c0c0c0; }
[data-theme="dark"] .nav-btn-secondary:hover { border-color: var(--nav-accent); color: var(--nav-accent); }
[data-theme="dark"] .nav-btn-secondary.active { background: var(--nav-fav-active-bg); border-color: var(--nav-fav-active-color); color: var(--nav-fav-active-color); }
[data-theme="dark"] .nav-single-meta-row { border-color: var(--nav-border); }
[data-theme="dark"] .nav-single-meta-tag { background: var(--nav-surface); border-color: var(--nav-border); color: var(--nav-text-muted); }
[data-theme="dark"] .nav-single-meta-tag:hover { background: var(--nav-accent); color: var(--nav-active-accent-text); }
[data-theme="dark"] .nav-single-meta-tag.cat-tag { background: var(--nav-cat-tag-bg); color: var(--nav-cat-tag-color); border-color: var(--nav-cat-tag-border); }
[data-theme="dark"] .nav-single-meta-tag.cat-tag:hover { background: var(--nav-accent); color: var(--nav-active-accent-text); }
[data-theme="dark"] .nav-rating-section { background: var(--nav-surface); border-color: var(--nav-border); }
[data-theme="dark"] .nav-rating-input .star-btn { color: var(--nav-border); }
[data-theme="dark"] .nav-info-block, [data-theme="dark"] .nav-article { background: var(--nav-surface); border-color: var(--nav-border); }
[data-theme="dark"] .nav-info-block h3, [data-theme="dark"] .nav-article h3 { border-color: var(--nav-border); color: var(--nav-text); }
[data-theme="dark"] .nav-info-block .content, [data-theme="dark"] .nav-article { color: #c0c0c0; }
[data-theme="dark"] .nav-keyword { background: var(--nav-surface); border-color: var(--nav-border); color: var(--nav-text-muted); }
[data-theme="dark"] .nav-related-card, [data-theme="dark"] .nav-featured-card { background: var(--nav-surface); border-color: var(--nav-border); }
[data-theme="dark"] .nav-related-card:hover, [data-theme="dark"] .nav-featured-card:hover { border-color: var(--nav-accent); }
[data-theme="dark"] .nav-share-modal { background: var(--nav-cat-count-bg); border-color: var(--nav-border); }
[data-theme="dark"] .nav-share-btn { background: var(--nav-surface); border-color: var(--nav-border); }
[data-theme="dark"] .nav-share-close { background: var(--nav-cat-count-bg); border-color: var(--nav-border); color: var(--nav-text); }
[data-theme="dark"] .nav-back-to-top { background: var(--nav-cat-count-bg); border-color: var(--nav-border); }
[data-theme="dark"] .qr-modal, [data-theme="dark"] .nav-share-modal { background: var(--nav-cat-count-bg); border-color: var(--nav-border); }
[data-theme="dark"] .qr-modal h4, [data-theme="dark"] .nav-share-title { color: var(--nav-text); }
[data-theme="dark"] .qr-modal p { color: var(--nav-text-muted); }
[data-theme="dark"] .nav-footer-bar { border-color: var(--nav-border); }

/* =============================================================
   Responsive
   ============================================================= */
@media (max-width: 900px) {
  .nav-layout { flex-direction: column; }
  .nav-sidebar { width: 100%; position: static; }
  .nav-sidebar-section { padding: 12px; }
  .nav-cat-list { display: flex; flex-wrap: wrap; gap: 8px; }
  .nav-cat-list a { padding: 6px 12px; border: 1px solid var(--nav-border); }
  .nav-quick-links { flex-direction: row; flex-wrap: wrap; }
  .nav-quick-link { flex: 1; justify-content: center; }
}
@media (max-width: 768px) {
  .nav-single-header { padding: 16px; }
  .nav-single-header-inner { flex-wrap: wrap; }
  .nav-single-actions { width: 100%; justify-content: flex-start; flex-wrap: wrap; }
  .nav-single-name { font-size: 1.25rem; }
  .nav-btn { padding: 8px 14px; font-size: 0.8125rem; }
  .nav-grid { grid-template-columns: repeat(2, 1fr); gap: 12px; }
  .nav-share-buttons { grid-template-columns: repeat(2, 1fr); }
  .nav-toast-container { bottom: 16px; right: 16px; left: 16px; }
}