/* ============================================
   BatteryBackupGuide.com — Unified Stylesheet
   ============================================ */

/* --- Variables --- */
:root {
  --bg-base: #0a0e1a;
  --text: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --border: rgba(255,255,255,0.08);
  --glow-blue: #00d4ff;
  --glow-purple: #7c3aed;
  --glow-green: #10b981;
  --glow-amber: #f59e0b;
  --bg-card: rgba(255,255,255,0.04);
  --bg-card-hover: rgba(255,255,255,0.08);
  --shadow: 0 4px 20px rgba(0,0,0,0.3);
}

/* Product images in articles */
.product-image-wrap {
  float: right;
  margin: 0 0 16px 20px;
  max-width: 200px;
  border-radius: 8px;
  overflow: hidden;
  background: var(--bg-card);
  padding: 8px;
}
.product-image-wrap img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 4px;
}

/* Advanced section styling */
.advanced-section {
  margin-top: 40px;
  padding: 24px;
  background: var(--bg-card);
  border-radius: 12px;
  border: 1px solid var(--border);
}
.advanced-section h3 {
  color: var(--glow-blue);
  margin-top: 24px;
  font-size: 1.1em;
}

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

/* --- Base --- */
body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg-base);
  color: var(--text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
body::before {
  content: '';
  position: fixed; top: 0; left: 0; width: 100%; height: 100%;
  background:
    radial-gradient(ellipse at 20% 50%, rgba(0,212,255,0.06) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 20%, rgba(124,58,237,0.05) 0%, transparent 50%);
  pointer-events: none; z-index: 0;
}

/* --- Container --- */
.container { max-width: 900px; margin: 0 auto; padding: 0 24px; position: relative; z-index: 1; }

/* --- Accessible Skip Link --- */
.skip-link {
  position: absolute; top: -40px; left: 0;
  background: var(--glow-blue); color: #000;
  padding: 8px 16px; z-index: 999;
  border-radius: 0 0 4px 0; font-weight: 600; font-size: 0.85rem;
  transition: top 0.2s;
}
.skip-link:focus { top: 0; }

/* --- Navigation --- */
.nav {
  background: rgba(10,14,26,0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  position: sticky; top: 0; z-index: 100; height: 56px;
}
.nav .container { display: flex; gap: 28px; align-items: center; height: 100%; }
.nav .logo { font-weight: 800; color: #fff; font-size: 1.05rem; margin-right: auto; letter-spacing: -0.3px; }
.nav .logo span { color: var(--glow-blue); }
.nav a { color: var(--text-secondary); text-decoration: none; font-size: 0.875rem; font-weight: 500; transition: color 0.2s; }
.nav a:hover, .nav a:focus { color: var(--glow-blue); }

/* ==================== HOMEPAGE STYLES ==================== */

/* Hero */
.hero { padding: 72px 0 48px; text-align: center; position: relative; }
.hero h1 {
  font-size: 2.8rem; font-weight: 900; letter-spacing: -1px; line-height: 1.1;
  margin-bottom: 12px;
  background: linear-gradient(135deg, #fff, var(--glow-blue), var(--glow-purple));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.hero p { font-size: 1.05rem; color: var(--text-secondary); max-width: 550px; margin: 0 auto 28px; line-height: 1.6; }
.hero .stats { display: flex; gap: 32px; justify-content: center; flex-wrap: wrap; }
.hero .stat-item { text-align: center; }
.hero .stat-num { font-size: 1.6rem; font-weight: 800; color: var(--glow-blue); }
.hero .stat-label { font-size: 0.75rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: 1px; margin-top: 2px; }

/* Section Labels */
.section-label { font-size: 0.75rem; font-weight: 700; text-transform: uppercase; letter-spacing: 1.5px; color: var(--text-muted); margin-bottom: 20px; text-align: center; }
.section-title { font-size: 1rem; font-weight: 700; margin-bottom: 20px; color: var(--text); display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.section-title::after { content: ''; flex: 1; height: 1px; background: linear-gradient(90deg, var(--border), transparent); }

/* Product Showcase Cards */
.showcase-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 16px; margin-bottom: 40px; }
.showcase-card {
  background: var(--bg-card); border: 1px solid var(--border); border-radius: 14px;
  padding: 20px; text-decoration: none; color: inherit;
  transition: all 0.3s; display: flex; flex-direction: column;
}
.showcase-card:hover {
  background: var(--bg-card-hover); border-color: rgba(0,212,255,0.25);
  transform: translateY(-3px); box-shadow: 0 8px 30px rgba(0,212,255,0.08);
}
.showcase-rank { font-size: 1.8rem; margin-bottom: 4px; line-height: 1; }
.showcase-img-wrap {
  aspect-ratio: 3/2; display: flex; align-items: center; justify-content: center; overflow: hidden;
  background: linear-gradient(135deg, rgba(0,0,0,0.3), rgba(0,0,0,0.1));
  border-radius: 10px; margin: 8px 0 12px; border: 1px solid rgba(255,255,255,0.06);
}
.showcase-img {
  border-radius: 8px; width: 100%; height: 100%;
  object-fit: contain; display: block;
  filter: drop-shadow(0 2px 8px rgba(0,212,255,0.08));
  transition: all 0.3s; background: transparent;
}
.showcase-card:hover .showcase-img { transform: scale(1.03); }
.showcase-name { font-weight: 700; font-size: 0.95rem; margin-bottom: 4px; color: var(--text); }
.showcase-specs { font-size: 0.75rem; color: var(--text-secondary); margin-bottom: 6px; line-height: 1.4; }
.showcase-tag {
  display: inline-block; padding: 2px 10px; border-radius: 20px;
  font-size: 0.65rem; font-weight: 600;
  background: rgba(0,212,255,0.1); color: var(--glow-blue);
  border: 1px solid rgba(0,212,255,0.2); align-self: flex-start; margin-top: auto;
}

/* Comparison Table */
.comp-table-wrap { overflow-x: auto; border-radius: 12px; border: 1px solid var(--border); margin-bottom: 40px; }
.comp-table { width: 100%; border-collapse: collapse; font-size: 0.82rem; }
.comp-table th {
  padding: 12px 10px; text-align: left;
  background: linear-gradient(135deg, rgba(0,212,255,0.1), rgba(124,58,237,0.1));
  color: var(--text); font-weight: 600; font-size: 0.7rem;
  text-transform: uppercase; letter-spacing: 0.5px;
}
.comp-table td { padding: 10px 8px; border-bottom: 1px solid var(--border); vertical-align: middle; }
.comp-table tbody tr:hover { background: rgba(255,255,255,0.02); }
.comp-table tbody tr:last-child td { border-bottom: none; }
.comp-rank { font-size: 1.2rem; text-align: center; width: 36px; }
.comp-thumb { width: 72px; padding: 4px !important; }
.comp-thumb img { width: 72px; height: 72px; object-fit: contain; border-radius: 8px; display: block; border: 1px solid rgba(0,212,255,0.12); box-shadow: 0 0 12px rgba(0,212,255,0.06); }
.comp-name { font-weight: 600; color: var(--text); font-size: 0.82rem; }
.comp-price { font-weight: 700; color: var(--text); }
.comp-cap { color: var(--text-secondary); font-size: 0.75rem; }
.best-tag {
  display: inline-block; padding: 2px 8px; border-radius: 20px;
  font-size: 0.6rem; font-weight: 600;
  background: rgba(0,212,255,0.1); color: var(--glow-blue);
  border: 1px solid rgba(0,212,255,0.2); white-space: nowrap;
}
.comp-btn {
  display: inline-block; padding: 5px 14px; border-radius: 20px;
  font-size: 0.7rem; font-weight: 600;
  color: #000; background: linear-gradient(135deg, var(--glow-blue), #0284c7);
  text-decoration: none; transition: all 0.2s; white-space: nowrap;
}
.comp-btn:hover { transform: scale(1.05); box-shadow: 0 4px 15px rgba(0,212,255,0.25); }
.comp-deal {
  display: inline-block; padding: 5px 10px; border-radius: 20px;
  font-size: 0.65rem; font-weight: 700;
  color: #000; background: linear-gradient(135deg, var(--glow-amber), #d97706);
  text-decoration: none; transition: all 0.2s; white-space: nowrap;
}
.comp-deal:hover { transform: scale(1.05); box-shadow: 0 4px 15px rgba(245,158,11,0.3); }

/* Collapsible Table */
.comp-row-extra { display: table-row; }
.comp-table.collapsed .comp-row-extra { display: none; }
.comp-toggle-wrap { text-align: center; padding: 12px 0 4px; }
.comp-toggle {
  display: inline-block; padding: 8px 24px; border-radius: 20px;
  border: 1px solid var(--border); background: transparent;
  color: var(--glow-blue); font-size: 0.8rem; font-weight: 600;
  cursor: pointer; transition: all 0.2s; font-family: inherit;
}
.comp-toggle:hover { background: rgba(0,212,255,0.1); border-color: var(--glow-blue); }

/* Post Cards (Homepage) */
.posts-grid { display: flex; flex-direction: column; gap: 14px; margin-bottom: 40px; }
.post-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: 12px; padding: 20px; display: flex; gap: 16px;
  align-items: flex-start; transition: all 0.3s;
}
.post-card:hover { background: var(--bg-card-hover); transform: translateY(-2px); box-shadow: var(--shadow); }
.post-card.card-buying { border-left: 3px solid var(--glow-blue); }
.post-card.card-guide { border-left: 3px solid var(--glow-green); }
.post-card.card-comparison { border-left: 3px solid var(--glow-purple); }
.card-icon { font-size: 1.5rem; min-width: 28px; margin-top: 1px; }
.card-body { flex: 1; }
.card-cat { font-size: 0.6rem; font-weight: 700; text-transform: uppercase; letter-spacing: 1px; margin-bottom: 4px; }
.cat-buying { color: var(--glow-blue); }
.cat-guide { color: var(--glow-green); }
.cat-comparison { color: var(--glow-purple); }
.post-card h2 { font-size: 1rem; font-weight: 600; margin-bottom: 4px; line-height: 1.3; }
.post-card h2 a { color: var(--text); text-decoration: none; transition: color 0.2s; }
.post-card h2 a:hover { color: var(--glow-blue); }
.card-meta { font-size: 0.75rem; color: var(--text-muted); margin-bottom: 6px; }
.post-card p { font-size: 0.82rem; color: var(--text-secondary); line-height: 1.5; }
.post-card .read-more { display: inline-block; margin-top: 8px; color: var(--glow-blue); font-weight: 600; font-size: 0.78rem; text-decoration: none; }
.post-card .read-more:hover { text-decoration: underline; }

/* Filter Tabs */
.filter-tabs { display: flex; gap: 6px; flex-wrap: wrap; }
.filter-btn {
  padding: 6px 16px; border-radius: 20px; border: 1px solid var(--border);
  background: transparent; color: var(--text-secondary); font-size: 0.75rem;
  font-weight: 500; cursor: pointer; transition: all 0.2s; font-family: inherit;
}
.filter-btn:hover { border-color: var(--glow-blue); color: var(--glow-blue); }
.filter-btn.active { background: var(--glow-blue); color: #000; border-color: var(--glow-blue); font-weight: 600; }
.post-card[data-cat] { display: flex; }

/* CTA Section */
.cta-section { text-align: center; padding: 40px 0; margin-bottom: 24px; border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.cta-section h2 { font-size: 1.2rem; font-weight: 700; margin-bottom: 6px; }
.cta-section p { color: var(--text-secondary); margin-bottom: 16px; font-size: 0.85rem; }
.btn {
  display: inline-block; background: linear-gradient(135deg, var(--glow-blue), #0284c7);
  color: #000; padding: 12px 28px; border-radius: 10px;
  text-decoration: none; font-weight: 700; font-size: 0.85rem; transition: all 0.3s;
}
.btn:hover { transform: translateY(-2px); box-shadow: 0 8px 30px rgba(0,212,255,0.3); }

/* Trust Section */
.trust-section { margin-bottom: 40px; text-align: center; }
.trust-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
.trust-item {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: 12px; padding: 24px 12px; text-align: center; transition: all 0.3s;
}
.trust-item:hover { background: var(--bg-card-hover); border-color: rgba(0,212,255,0.2); }
.trust-icon { font-size: 1.6rem; margin-bottom: 6px; }
.trust-num { font-size: 1.4rem; font-weight: 800; color: var(--glow-blue); }
.trust-label { font-size: 0.72rem; color: var(--text-muted); margin-top: 2px; text-transform: uppercase; letter-spacing: 0.5px; }

/* ==================== ARTICLE STYLES ==================== */

/* Reading Progress */
.progress-bar {
  position: fixed; top: 0; left: 0; width: 0; height: 3px;
  background: linear-gradient(90deg, var(--glow-blue), var(--glow-purple));
  z-index: 1000; transition: width 0.1s;
}

/* Breadcrumbs */
.breadcrumbs { display: flex; gap: 8px; align-items: center; font-size: 0.8rem; color: var(--text-muted); margin-bottom: 16px; padding: 16px 0 0; }
.breadcrumbs a { color: var(--text-muted); text-decoration: none; }
.breadcrumbs a:hover { color: var(--glow-blue); }

/* Article Content */
.post-content { padding: 32px 0 48px; }
.post-content h1 {
  font-size: 2.2rem; font-weight: 800; line-height: 1.3; letter-spacing: -0.5px;
  margin-bottom: 16px;
  background: linear-gradient(135deg, #fff, var(--glow-blue));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.post-content .post-meta {
  color: var(--text-muted); font-size: 0.85rem; margin-bottom: 24px;
  padding-bottom: 20px; border-bottom: 1px solid var(--border);
  display: flex; gap: 16px; flex-wrap: wrap; align-items: center;
}
.cat-badge {
  display: inline-block; padding: 3px 12px; border-radius: 20px;
  font-size: 0.7rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.5px;
}
.cat-badge.guide { background: rgba(16,185,129,0.15); color: #34d399; }
.cat-badge.buying-guide { background: rgba(0,212,255,0.15); color: #00d4ff; }
.cat-badge.comparison { background: rgba(124,58,237,0.15); color: #a78bfa; }
.post-content h2 { font-size: 1.5rem; font-weight: 700; margin: 40px 0 14px; letter-spacing: -0.3px; color: var(--text); }
.post-content h2::before { content: ''; display: block; width: 40px; height: 3px; background: linear-gradient(90deg, var(--glow-blue), var(--glow-purple)); border-radius: 2px; margin-bottom: 12px; }
.post-content h3 { font-size: 1.15rem; font-weight: 600; margin: 28px 0 10px; color: var(--text); }
.post-content p { margin-bottom: 18px; color: var(--text-secondary); font-size: 1rem; line-height: 1.8; }
.post-content ul, .post-content ol { margin: 0 0 18px 24px; color: var(--text-secondary); }
.post-content li { margin-bottom: 8px; }
.post-content strong { color: var(--text); }

/* Product Box */
.post-content .product-box {
  background: linear-gradient(135deg, rgba(0,212,255,0.06), rgba(124,58,237,0.06));
  border: 1px solid rgba(0,212,255,0.15); border-radius: 14px;
  padding: 28px; margin: 28px 0; position: relative;
}
.post-content .product-box .rank-badge {
  position: absolute; top: -10px; left: 20px;
  background: linear-gradient(135deg, var(--glow-blue), var(--glow-purple));
  color: #000; font-size: 0.7rem; font-weight: 800;
  padding: 4px 14px; border-radius: 20px;
  text-transform: uppercase; letter-spacing: 0.5px;
}
.post-content .product-box h3 { margin-top: 4px; font-size: 1.2rem; color: var(--glow-blue); }
.post-content .product-box p { margin-bottom: 10px; }

/* Pros/Cons */
.post-content .pros-cons { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin: 24px 0; }
.post-content .pros, .post-content .cons { padding: 20px; border-radius: 12px; }
.post-content .pros { background: rgba(16,185,129,0.08); border: 1px solid rgba(16,185,129,0.2); }
.post-content .cons { background: rgba(239,68,68,0.08); border: 1px solid rgba(239,68,68,0.2); }
.post-content .pros h4 { color: #34d399; }
.post-content .cons h4 { color: #f87171; }
.post-content .pros ul, .post-content .cons ul { margin: 0; padding: 0; list-style: none; font-size: 0.9rem; }
.post-content .pros li, .post-content .cons li { padding: 3px 0; position: relative; padding-left: 18px; }
.post-content .pros li::before { content: '+'; color: var(--glow-green); position: absolute; left: 0; font-weight: 700; }
.post-content .cons li::before { content: '-'; color: #f87171; position: absolute; left: 0; font-weight: 700; }

/* Article Tables */
.post-content table { width: 100%; border-collapse: separate; border-spacing: 0; margin: 24px 0; border-radius: 12px; overflow: hidden; }
.post-content th, .post-content td { padding: 12px 14px; text-align: left; border-bottom: 1px solid rgba(255,255,255,0.06); font-size: 0.85rem; }
.post-content th { background: linear-gradient(135deg, rgba(0,212,255,0.15), rgba(124,58,237,0.15)); color: var(--text); font-weight: 600; font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.3px; }
.post-content tr:last-child td { border-bottom: none; }
.post-content tr:hover td { background: rgba(255,255,255,0.03); }

/* Callouts */
.callout { background: rgba(245,158,11,0.1); border-left: 4px solid var(--glow-amber); border-radius: 0 10px 10px 0; padding: 20px 24px; margin: 24px 0; }
.callout p { margin: 0; color: var(--glow-amber); }
.warning { background: rgba(239,68,68,0.1); border-left: 4px solid #f87171; border-radius: 0 10px 10px 0; padding: 20px 24px; margin: 24px 0; }
.warning p { margin: 0; color: #f87171; }
.stars { color: var(--glow-amber); font-size: 0.9rem; letter-spacing: 2px; }
.btn-accent { background: linear-gradient(135deg, var(--glow-amber), #d97706); color: #000; }

/* FAQ */
.faq-item { border: 1px solid var(--border); border-radius: 12px; padding: 20px 24px; margin: 16px 0; background: var(--bg-card); }
.faq-item h3 { margin-top: 0; font-size: 1rem; color: var(--text); }
.faq-item p { margin-bottom: 0; }

/* Table of Contents */
.toc-sidebar { background: rgba(255,255,255,0.03); border: 1px solid var(--border); border-radius: 10px; margin-bottom: 28px; overflow: hidden; }
.toc-header { padding: 12px 16px; cursor: pointer; font-size: 0.82rem; font-weight: 600; display: flex; align-items: center; gap: 8px; color: var(--text); user-select: none; }
.toc-header:hover { background: rgba(255,255,255,0.03); }
.toc-toggle { font-size: 0.7rem; transition: transform 0.2s; color: var(--text-muted); }
.toc-body { padding: 0 16px 12px; }
.toc-body.collapsed { display: none; }
.toc-body ol { margin: 0; padding: 0; list-style: none; counter-reset: toc-counter; }
.toc-body li { margin-bottom: 4px; padding-left: 20px; position: relative; }
.toc-body li::before { content: counter(toc-counter); counter-increment: toc-counter; color: var(--glow-blue); font-weight: 600; font-size: 0.72rem; position: absolute; left: 0; }
.toc-link { color: var(--text-secondary); text-decoration: none; font-size: 0.82rem; transition: color 0.2s; display: inline-block; padding: 3px 0; }
.toc-link:hover { color: var(--glow-blue); }
html { scroll-behavior: smooth; }

/* Share Section */
.share-section { margin: 32px 0; padding-top: 24px; border-top: 1px solid var(--border); }
.share-section h3 { font-size: 0.9rem; font-weight: 600; margin-bottom: 12px; }
.share-buttons { display: flex; gap: 8px; flex-wrap: wrap; }
.share-btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 8px 16px; border-radius: 8px; font-size: 0.78rem; font-weight: 600;
  text-decoration: none; transition: all 0.2s;
  color: #e2e8f0; background: rgba(0,0,0,0.2);
}
.share-btn:hover { transform: translateY(-1px); }
.share-twitter:hover { background: #1da1f2; color: #fff; }
.share-facebook:hover { background: #1877f2; color: #fff; }
.share-reddit:hover { background: #ff4500; color: #fff; }
.share-email:hover { background: var(--glow-blue); color: #000; }

/* Related Articles */
.related-section { margin-top: 48px; padding-top: 32px; border-top: 1px solid var(--border); }
.related-section h2 { font-size: 1.1rem; font-weight: 700; margin-bottom: 16px; }
.related-grid { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 14px; }
.related-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: 10px; padding: 16px; text-decoration: none; color: inherit; transition: all 0.2s; }
.related-card:hover { background: var(--bg-card-hover); border-color: rgba(0,212,255,0.2); transform: translateY(-2px); }
.related-icon { font-size: 1.3rem; margin-bottom: 6px; }
.related-title { font-size: 0.82rem; font-weight: 600; line-height: 1.3; margin-bottom: 4px; }
.related-cat { font-size: 0.65rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.5px; }

/* Link List */
.link-list { list-style: none; padding: 0; margin: 8px 0 0; }
.link-list li { margin-bottom: 6px; padding-left: 16px; position: relative; font-size: 0.9rem; }
.link-list li::before { content: '›'; position: absolute; left: 0; color: var(--glow-blue); font-weight: 700; }
.internal-link { color: var(--glow-blue); text-decoration: none; }
.internal-link:hover { text-decoration: underline; }

/* ==================== ABOUT PAGE ==================== */
.about-content { padding: 48px 0; }
.about-content h1 {
  font-size: 2rem; font-weight: 800; margin-bottom: 16px;
  background: linear-gradient(135deg, #fff, var(--glow-blue));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.about-content h2 { font-size: 1.2rem; font-weight: 700; margin: 32px 0 12px; color: var(--text); }
.about-content h2::before { content: ''; display: block; width: 30px; height: 3px; background: linear-gradient(90deg, var(--glow-blue), var(--glow-purple)); border-radius: 2px; margin-bottom: 10px; }
.about-content p { margin-bottom: 16px; color: var(--text-secondary); }

/* ==================== 404 PAGE ==================== */
.page-404 {
  display: flex; flex-direction: column; min-height: 100vh;
  align-items: center; justify-content: center; text-align: center; padding: 40px 24px;
}
.page-404 .code {
  font-size: 6rem; font-weight: 900;
  background: linear-gradient(135deg, var(--glow-blue), var(--glow-purple));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
  line-height: 1; margin-bottom: 8px;
}
.page-404 h1 { font-size: 1.3rem; font-weight: 700; margin-bottom: 12px; }
.page-404 p { color: var(--text-secondary); margin-bottom: 28px; font-size: 0.9rem; }
.page-404 .links { display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; }
.btn-primary { background: linear-gradient(135deg, var(--glow-blue), #0284c7); color: #000; }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 6px 20px rgba(0,212,255,0.25); }
.btn-outline { border: 1px solid var(--border); color: var(--text-secondary); }
.btn-outline:hover { border-color: var(--glow-blue); color: var(--glow-blue); }

/* ==================== BACK TO TOP ==================== */
.back-top {
  position: fixed; bottom: 30px; right: 30px; width: 44px; height: 44px;
  border-radius: 50%; border: 1px solid var(--border);
  background: rgba(10,14,26,0.8); backdrop-filter: blur(8px);
  color: var(--text-secondary); font-size: 1.2rem; cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  opacity: 0; visibility: hidden; transition: all 0.3s;
  z-index: 999; font-family: inherit;
}
.back-top.visible { opacity: 1; visibility: visible; }
.back-top:hover { background: var(--glow-blue); color: #000; border-color: var(--glow-blue); transform: translateY(-2px); }

/* ==================== ANIMATIONS ==================== */
@keyframes fadeUp { from { opacity: 0; transform: translateY(16px); } to { opacity: 1; transform: translateY(0); } }
.hero h1, .hero p, .hero .stats, .showcase-card, .post-card { animation: fadeUp 0.5s ease-out both; }
.hero p { animation-delay: 0.1s; }
.hero .stats { animation-delay: 0.15s; }
.showcase-card:nth-child(1) { animation-delay: 0.18s; }
.showcase-card:nth-child(2) { animation-delay: 0.22s; }
.showcase-card:nth-child(3) { animation-delay: 0.26s; }
.showcase-card:nth-child(4) { animation-delay: 0.30s; }
.showcase-card:nth-child(5) { animation-delay: 0.34s; }
.post-card:nth-child(1) { animation-delay: 0.25s; }
.post-card:nth-child(2) { animation-delay: 0.3s; }
.post-card:nth-child(3) { animation-delay: 0.35s; }
.product-box, .callout, .warning { animation: fadeUp 0.4s ease-out; }

/* ==================== FOOTER ==================== */
.footer { background: rgba(255,255,255,0.02); border-top: 1px solid var(--border); color: var(--text-secondary); padding: 40px 0 24px; margin-top: 32px; }
.footer .container { max-width: 900px; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 32px; margin-bottom: 24px; }
.footer h3 { color: #fff; font-size: 0.85rem; margin-bottom: 10px; }
.footer p { font-size: 0.8rem; line-height: 1.6; }
.footer a { color: var(--glow-blue); text-decoration: none; }
.footer a:hover { text-decoration: underline; }
.footer ul { list-style: none; }
.footer li { margin-bottom: 5px; font-size: 0.8rem; }
.footer li a { color: var(--text-secondary); }
.footer li a:hover { color: var(--glow-blue); }
.footer .footer-bottom { border-top: 1px solid var(--border); padding-top: 16px; text-align: center; font-size: 0.75rem; color: var(--text-muted); }
.footer .disclosure { font-size: 0.72rem; margin-top: 6px; }

/* ==================== PRINT ==================== */
@media print {
  .nav, .footer, .toc-sidebar, .share-section, .related-section, .back-top, .progress-bar { display: none !important; }
  body { background: #fff !important; color: #000 !important; }
  .container { max-width: 100%; }
  .post-content h1 { -webkit-text-fill-color: #000 !important; color: #000 !important; }
}

/* ==================== RESPONSIVE ==================== */
@media (max-width: 900px) {
  .trust-grid { grid-template-columns: repeat(2, 1fr); }
  .related-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 768px) {
  .container { padding: 0 20px; }
  .hero h1 { font-size: 2rem; }
  .hero { padding: 48px 0 36px; }
  .post-card { flex-direction: column; gap: 10px; padding: 16px; }
  .footer-grid { grid-template-columns: 1fr; gap: 20px; }
  .hero .stats { gap: 20px; }
  .showcase-grid { grid-template-columns: 1fr 1fr; }
  .post-content h1 { font-size: 1.5rem; }
  .post-content h2 { font-size: 1.2rem; }
  .post-content .pros-cons { grid-template-columns: 1fr; }
}
@media (max-width: 600px) {
  .container { padding: 0 16px; }
  .trust-grid { grid-template-columns: 1fr 1fr; }
  .related-grid { grid-template-columns: 1fr; }
  .post-content th, .post-content td { padding: 8px 10px; }
  .post-content .product-box { padding: 20px; }
}
@media (max-width: 480px) {
  .hero h1 { font-size: 1.5rem; }
  .showcase-grid { grid-template-columns: 1fr; }
  .section-title { flex-direction: column; align-items: flex-start; gap: 10px; }
}