/* ==========================================================================
   Geek Minimalist Dark/Light CSS Design System
   Optimized for: Speed (<20KB), Zero Layout Shift (CLS=0), High Readability
   ========================================================================== */

:root {
  --bg-primary: #09090b;
  --bg-surface: #121217;
  --bg-surface-hover: #181820;
  --bg-surface-active: #20202b;
  --bg-code: #050507;
  
  --border-subtle: #1f1f28;
  --border-strong: #2e2e3d;
  --border-highlight: #3b82f6;

  --text-primary: #f4f4f5;
  --text-secondary: #a1a1aa;
  --text-muted: #71717a;
  --text-link: #60a5fa;

  --accent-green: #10b981;
  --accent-green-bg: rgba(16, 185, 129, 0.12);
  --accent-blue: #3b82f6;
  --accent-blue-bg: rgba(59, 130, 246, 0.12);
  --accent-amber: #f59e0b;
  --accent-amber-bg: rgba(245, 158, 11, 0.12);
  --accent-purple: #8b5cf6;
  --accent-purple-bg: rgba(139, 92, 246, 0.12);

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: "JetBrains Mono", "SF Mono", Consolas, Menlo, Monaco, "Courier New", monospace;

  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-full: 9999px;

  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.5);
  --shadow-md: 0 4px 12px 0 rgba(0, 0, 0, 0.6);
  --shadow-glow: 0 0 20px -3px rgba(59, 130, 246, 0.15);

  --max-width: 1160px;
  --header-height: 64px;
}

/* Light Mode Overrides (Optional / Default Dark Geek) */
[data-theme="light"] {
  --bg-primary: #fafafa;
  --bg-surface: #ffffff;
  --bg-surface-hover: #f4f4f5;
  --bg-surface-active: #e4e4e7;
  --bg-code: #f1f1f4;
  --border-subtle: #e4e4e7;
  --border-strong: #d4d4d8;
  --text-primary: #09090b;
  --text-secondary: #52525b;
  --text-muted: #a1a1aa;
  --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 12px 0 rgba(0, 0, 0, 0.08);
}

/* Base Reset & Typography */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.65;
  scroll-behavior: smooth;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color 0.15s ease;
}

a:hover {
  color: var(--text-link);
}

code, kbd, samp, pre {
  font-family: var(--font-mono);
}

img, svg {
  vertical-align: middle;
  max-width: 100%;
  height: auto;
}

/* Layout Container */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: 20px;
  padding-right: 20px;
}

/* ==========================================================================
   Header & Navigation
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(9, 9, 11, 0.88);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-subtle);
  height: var(--header-height);
  display: flex;
  align-items: center;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}

.brand-logo {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  font-size: 1.125rem;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  text-decoration: none;
  transition: opacity 0.2s ease;
}

.brand-logo:hover {
  opacity: 0.92;
}

.brand-logo .logo-icon-svg {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-green, #10b981);
  line-height: 1;
  transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1), color 0.2s ease;
}

.brand-logo:hover .logo-icon-svg {
  transform: scale(1.12);
  color: #34d399;
}

.brand-logo .logo-icon {
  display: none;
}

.brand-logo .version-badge {
  font-size: 0.68rem;
  font-family: var(--font-mono);
  color: var(--accent-green);
  background-color: var(--accent-green-bg);
  padding: 2px 7px;
  border-radius: var(--radius-full);
  border: 1px solid rgba(16, 185, 129, 0.25);
  line-height: 1.2;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 24px;
  list-style: none;
}

.nav-item {
  position: relative;
}

.nav-link {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  padding: 8px 4px;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  transition: color 0.15s ease;
}

.nav-link:hover, .nav-link.active {
  color: var(--text-primary);
}

.nav-link svg {
  width: 14px;
  height: 14px;
  transition: transform 0.2s ease;
}

.nav-item:hover .nav-link svg {
  transform: rotate(180deg);
}

/* Dropdown Menu */
.dropdown-menu {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 210px;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-md);
  padding: 6px;
  box-shadow: var(--shadow-md);
  list-style: none;
  z-index: 110;
}

.nav-item:hover .dropdown-menu {
  display: block;
  animation: fadeInDown 0.18s ease-out;
}

.dropdown-menu a {
  display: block;
  padding: 8px 12px;
  font-size: 0.85rem;
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  transition: background-color 0.15s, color 0.15s;
}

.dropdown-menu a:hover {
  background-color: var(--bg-surface-hover);
  color: var(--text-primary);
}

.dropdown-menu .badge-mini {
  float: right;
  font-size: 0.7rem;
  padding: 1px 6px;
  background: var(--border-subtle);
  border-radius: var(--radius-full);
}

/* Nav Actions */
.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.btn-fast-cta {
  background-color: var(--text-primary);
  color: var(--bg-primary);
  font-size: 0.85rem;
  font-weight: 600;
  padding: 7px 14px;
  border-radius: var(--radius-sm);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: opacity 0.15s, transform 0.15s;
}

.btn-fast-cta:hover {
  opacity: 0.92;
  transform: translateY(-1px);
  color: var(--bg-primary);
}

.mobile-menu-toggle {
  display: none;
  background: transparent;
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  padding: 6px;
  border-radius: var(--radius-sm);
  cursor: pointer;
}

/* ==========================================================================
   Hero Section
   ========================================================================== */
.hero {
  padding: 64px 0 48px;
  border-bottom: 1px solid var(--border-subtle);
  position: relative;
  overflow: hidden;
}

.hero::after {
  content: "";
  position: absolute;
  top: -150px;
  right: 10%;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(59, 130, 246, 0.08) 0%, transparent 70%);
  pointer-events: none;
}

.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.78rem;
  font-family: var(--font-mono);
  color: var(--text-secondary);
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  padding: 4px 12px;
  border-radius: var(--radius-full);
  margin-bottom: 20px;
}

.pulse-indicator {
  width: 8px;
  height: 8px;
  background-color: var(--accent-green);
  border-radius: 50%;
  box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7);
  animation: pulseGreen 2s infinite;
}

.hero-title {
  font-size: clamp(2.1rem, 4.5vw, 3.4rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: 18px;
  max-width: 860px;
}

.hero-title .gradient-text {
  background: linear-gradient(135deg, #ffffff 40%, #a1a1aa 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-desc {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 720px;
  margin-bottom: 32px;
  line-height: 1.7;
}

/* Stat Matrix */
.hero-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 16px;
  margin-top: 36px;
  padding-top: 24px;
  border-top: 1px dashed var(--border-subtle);
}

.stat-item {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  padding: 14px 18px;
  border-radius: var(--radius-md);
  transition: border-color 0.15s ease;
}

.stat-item:hover {
  border-color: var(--border-strong);
}

.stat-num {
  font-family: var(--font-mono);
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--text-primary);
  display: flex;
  align-items: baseline;
  gap: 4px;
}

.stat-num .unit {
  font-size: 0.85rem;
  color: var(--accent-green);
  font-weight: 500;
}

.stat-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 4px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* ==========================================================================
   Featured Long-form Benchmark Card (High CTR)
   ========================================================================== */
.featured-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-lg);
  padding: 32px;
  margin: 40px 0;
  position: relative;
  box-shadow: var(--shadow-sm);
  transition: border-color 0.2s, box-shadow 0.2s;
}

.featured-card:hover {
  border-color: var(--accent-blue);
  box-shadow: var(--shadow-glow);
}

.featured-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 16px;
  flex-wrap: wrap;
}

.featured-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  background-color: var(--accent-blue-bg);
  color: var(--accent-blue);
  padding: 4px 10px;
  border-radius: var(--radius-full);
  border: 1px solid rgba(59, 130, 246, 0.3);
  text-transform: uppercase;
  font-weight: 600;
}

.featured-meta {
  display: flex;
  gap: 16px;
  font-size: 0.82rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

.featured-title {
  font-size: 1.55rem;
  font-weight: 700;
  line-height: 1.35;
  margin-bottom: 14px;
}

.featured-excerpt {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.7;
  margin-bottom: 22px;
}

.benchmark-highlights {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 12px;
  background: var(--bg-primary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 16px;
  margin-bottom: 24px;
}

.highlight-box {
  display: flex;
  flex-direction: column;
}

.highlight-title {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
  text-transform: uppercase;
}

.highlight-value {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-top: 4px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.featured-actions {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
}

/* ==========================================================================
   Buttons & Controls
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 0.88rem;
  font-weight: 600;
  padding: 9px 18px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.15s ease;
  border: 1px solid transparent;
  white-space: nowrap;
}

.btn-primary {
  background-color: var(--text-primary);
  color: var(--bg-primary);
}

.btn-primary:hover {
  opacity: 0.92;
  color: var(--bg-primary);
  transform: translateY(-1px);
}

.btn-secondary {
  background-color: var(--bg-surface);
  color: var(--text-primary);
  border-color: var(--border-strong);
}

.btn-secondary:hover {
  background-color: var(--bg-surface-hover);
  border-color: var(--text-secondary);
}

.btn-outline-green {
  background-color: var(--accent-green-bg);
  color: var(--accent-green);
  border: 1px solid rgba(16, 185, 129, 0.4);
}

.btn-outline-green:hover {
  background-color: rgba(16, 185, 129, 0.22);
}

.btn-sm {
  padding: 6px 12px;
  font-size: 0.8rem;
}

/* ==========================================================================
   Brand Cards & Matrix (Top 6 / Specialized Lists)
   ========================================================================== */
.section-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  margin: 50px 0 24px;
  gap: 16px;
  flex-wrap: wrap;
}

.section-title {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.section-subtitle {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-top: 4px;
}

.brand-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-bottom: 48px;
}

.brand-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 24px;
  display: grid;
  grid-template-columns: 60px 1.5fr 1fr 1fr 200px;
  align-items: center;
  gap: 20px;
  transition: border-color 0.15s ease, background-color 0.15s ease;
}

.brand-card:hover {
  border-color: var(--border-strong);
  background-color: var(--bg-surface-hover);
}

.brand-rank {
  font-family: var(--font-mono);
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--text-muted);
  text-align: center;
}

.brand-card:nth-child(1) .brand-rank { color: #f59e0b; }
.brand-card:nth-child(2) .brand-rank { color: #94a3b8; }
.brand-card:nth-child(3) .brand-rank { color: #d97706; }

.brand-main {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.brand-name {
  font-size: 1.15rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 10px;
}

.brand-tags {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.tag {
  font-size: 0.72rem;
  font-family: var(--font-mono);
  padding: 2px 7px;
  border-radius: var(--radius-sm);
  background: var(--bg-primary);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
}

.tag-iepl {
  color: var(--accent-green);
  border-color: rgba(16, 185, 129, 0.3);
  background: var(--accent-green-bg);
}

.tag-hot {
  color: var(--accent-amber);
  border-color: rgba(245, 158, 11, 0.3);
  background: var(--accent-amber-bg);
}

.brand-features {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

.brand-metrics {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.metric-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.8rem;
  font-family: var(--font-mono);
}

.metric-label {
  color: var(--text-muted);
}

.metric-val {
  color: var(--text-primary);
  font-weight: 600;
}

.brand-price {
  font-size: 1.15rem;
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--text-primary);
}

.brand-price small {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-weight: 400;
}

.brand-actions {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

/* ==========================================================================
   Coupon Matrix & Copy Widget
   ========================================================================== */
.coupon-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 20px;
  margin: 32px 0 48px;
}

.coupon-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 20px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  position: relative;
  transition: transform 0.15s ease, border-color 0.15s ease;
}

.coupon-card:hover {
  transform: translateY(-2px);
  border-color: var(--border-strong);
}

.coupon-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 12px;
}

.coupon-brand {
  font-size: 1.05rem;
  font-weight: 700;
}

.coupon-discount {
  font-size: 0.85rem;
  font-family: var(--font-mono);
  color: var(--accent-amber);
  background: var(--accent-amber-bg);
  border: 1px solid rgba(245, 158, 11, 0.3);
  padding: 3px 8px;
  border-radius: var(--radius-sm);
  font-weight: 600;
}

.coupon-desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 18px;
  min-height: 40px;
}

.coupon-copy-row {
  display: flex;
  align-items: center;
  background: var(--bg-primary);
  border: 1px dashed var(--border-strong);
  border-radius: var(--radius-sm);
  padding: 4px 6px 4px 12px;
  margin-bottom: 12px;
}

.coupon-code-text {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--text-primary);
  letter-spacing: 0.05em;
  flex: 1;
}

.btn-copy {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  font-size: 0.78rem;
  font-family: var(--font-mono);
  padding: 5px 10px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.15s ease;
}

.btn-copy:hover {
  color: var(--text-primary);
  border-color: var(--border-strong);
}

.btn-copy.copied {
  background: var(--accent-green-bg);
  color: var(--accent-green);
  border-color: rgba(16, 185, 129, 0.4);
}

/* ==========================================================================
   Article / Benchmark Long-form Content
   ========================================================================== */
.article-container {
  max-width: 820px;
  margin: 0 auto;
  padding: 40px 20px 80px;
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.82rem;
  font-family: var(--font-mono);
  color: var(--text-muted);
  margin-bottom: 24px;
}

.breadcrumb a {
  color: var(--text-secondary);
}

.breadcrumb a:hover {
  color: var(--text-primary);
}

.article-header {
  border-bottom: 1px solid var(--border-subtle);
  padding-bottom: 28px;
  margin-bottom: 36px;
}

.article-title {
  font-size: clamp(1.8rem, 3.5vw, 2.5rem);
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
}

.article-meta {
  display: flex;
  align-items: center;
  gap: 16px;
  font-size: 0.85rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
  flex-wrap: wrap;
}

.article-body {
  font-size: 1.05rem;
  line-height: 1.8;
  color: #d4d4d8;
}

.article-body h2 {
  font-size: 1.5rem;
  font-weight: 700;
  margin: 44px 0 18px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-subtle);
  color: var(--text-primary);
}

.article-body h3 {
  font-size: 1.2rem;
  font-weight: 600;
  margin: 28px 0 12px;
  color: var(--text-primary);
}

.article-body p {
  margin-bottom: 20px;
}

.article-body ul, .article-body ol {
  margin-bottom: 20px;
  padding-left: 24px;
}

.article-body li {
  margin-bottom: 8px;
}

/* Callouts / Alerts */
.callout {
  background: var(--bg-surface);
  border-left: 4px solid var(--accent-blue);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  padding: 16px 20px;
  margin: 24px 0;
  font-size: 0.95rem;
}

.callout.callout-warning {
  border-left-color: var(--accent-amber);
  background: rgba(245, 158, 11, 0.05);
}

.callout.callout-success {
  border-left-color: var(--accent-green);
  background: rgba(16, 185, 129, 0.05);
}

.callout-title {
  font-weight: 700;
  margin-bottom: 6px;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 6px;
}

/* Benchmark Metric Table */
.table-wrapper,
.table-responsive {
  width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  margin-bottom: 24px;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  background: var(--bg-surface);
}

.benchmark-table {
  min-width: 780px;
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
  text-align: left;
}

.benchmark-table th {
  background-color: var(--bg-primary);
  color: var(--text-secondary);
  font-family: var(--font-mono);
  font-weight: 600;
  padding: 12px 16px;
  border-bottom: 1px solid var(--border-subtle);
  white-space: nowrap;
}

.benchmark-table td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border-subtle);
  color: var(--text-primary);
}

.benchmark-table tr:last-child td {
  border-bottom: none;
}

.benchmark-table tr:hover td {
  background-color: var(--bg-surface-hover);
}

/* Code Blocks */
.code-block {
  background: var(--bg-code);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  margin: 24px 0;
  overflow: hidden;
}

.code-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 16px;
  background: rgba(255, 255, 255, 0.03);
  border-bottom: 1px solid var(--border-subtle);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-muted);
}

.code-block pre {
  padding: 16px;
  overflow-x: auto;
  font-size: 0.88rem;
  line-height: 1.6;
  color: #e4e4e7;
}

/* Conversion CTA Module */
.article-cta {
  background: linear-gradient(180deg, var(--bg-surface) 0%, rgba(18, 18, 23, 0.7) 100%);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-lg);
  padding: 32px;
  margin: 50px 0 20px;
  text-align: center;
  position: relative;
}

.article-cta h3 {
  font-size: 1.45rem;
  margin-bottom: 10px;
  border: none;
  padding: 0;
}

.article-cta p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  max-width: 580px;
  margin: 0 auto 24px;
}

.article-cta-buttons {
  display: flex;
  justify-content: center;
  gap: 14px;
  flex-wrap: wrap;
}

/* ==========================================================================
   FAQ Section (Schema FAQPage ready)
   ========================================================================== */
.faq-section,
.faq-container,
#faq {
  width: 100%;
  max-width: var(--max-width);
  margin-top: 60px;
  margin-bottom: 60px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 20px;
  padding-right: 20px;
  box-sizing: border-box;
}

.faq-section .section-header,
.faq-container .section-header {
  margin-top: 0;
  margin-bottom: 24px;
  width: 100%;
}

.faq-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 24px;
}

.faq-item {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.faq-question {
  width: 100%;
  text-align: left;
  padding: 18px 20px;
  background: transparent;
  border: none;
  color: var(--text-primary);
  font-size: 1rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  transition: color 0.15s;
}

.faq-question:hover {
  color: var(--text-link);
}

.faq-icon {
  font-family: var(--font-mono);
  font-size: 1.2rem;
  transition: transform 0.2s ease;
}

.faq-item.active .faq-icon {
  transform: rotate(45deg);
}

.faq-answer {
  display: none;
  padding: 0 20px 20px;
  color: var(--text-secondary);
  font-size: 0.92rem;
  line-height: 1.7;
  border-top: 1px dashed var(--border-subtle);
  padding-top: 16px;
}

.faq-item.active .faq-answer {
  display: block;
}

/* ==========================================================================
   Toast Notification (For Copy Actions)
   ========================================================================== */
.toast {
  position: fixed;
  bottom: 30px;
  right: 30px;
  background-color: var(--bg-surface);
  border: 1px solid var(--accent-green);
  color: var(--text-primary);
  padding: 12px 20px;
  border-radius: var(--radius-md);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.5);
  font-size: 0.88rem;
  display: flex;
  align-items: center;
  gap: 10px;
  transform: translateY(100px);
  opacity: 0;
  transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.25s ease;
  z-index: 9999;
}

.toast.show {
  transform: translateY(0);
  opacity: 1;
}

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
  margin-top: auto;
  border-top: 1px solid var(--border-subtle);
  background-color: var(--bg-surface);
  padding: 50px 0 30px;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}

.footer-brand h4 {
  font-size: 1.05rem;
  color: var(--text-primary);
  margin-bottom: 12px;
}

.footer-brand p {
  line-height: 1.6;
  max-width: 340px;
}

.footer-col h5 {
  color: var(--text-primary);
  font-size: 0.9rem;
  margin-bottom: 16px;
  text-transform: uppercase;
  font-family: var(--font-mono);
  letter-spacing: 0.05em;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-links a {
  color: var(--text-secondary);
}

.footer-links a:hover {
  color: var(--text-primary);
}

.footer-bottom {
  border-top: 1px solid var(--border-subtle);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 0.8rem;
}

.disclaimer-text {
  max-width: 760px;
  line-height: 1.5;
  color: var(--text-muted);
}

/* ==========================================================================
   Responsive Adaptations
   ========================================================================== */
@media (max-width: 900px) {
  .brand-card {
    grid-template-columns: 1fr;
    gap: 16px;
  }
  
  .brand-rank {
    text-align: left;
    font-size: 1.1rem;
    display: inline-flex;
    align-items: center;
    gap: 8px;
  }
  
  .brand-rank::before {
    content: "RANK #";
    font-size: 0.75rem;
    color: var(--text-muted);
  }

  .brand-actions {
    flex-direction: row;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 720px) {
  .nav-links {
    display: none;
    position: absolute;
    top: var(--header-height);
    left: 0;
    width: 100%;
    background-color: var(--bg-surface);
    border-bottom: 1px solid var(--border-strong);
    flex-direction: column;
    padding: 16px 20px;
    gap: 12px;
  }

  .nav-links.mobile-open {
    display: flex;
  }

  .dropdown-menu {
    position: static;
    box-shadow: none;
    border: none;
    padding-left: 12px;
    background: transparent;
  }

  .mobile-menu-toggle {
    display: block;
  }

  .footer-grid {
    grid-template-columns: 1fr;
  }

  .featured-card {
    padding: 20px;
  }
}

/* Animations */
@keyframes fadeInDown {
  from {
    opacity: 0;
    transform: translateY(-6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes pulseGreen {
  0% {
    box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7);
  }
  70% {
    box-shadow: 0 0 0 6px rgba(16, 185, 129, 0);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(16, 185, 129, 0);
  }
}

/* ==========================================================================
   Post Listing & Lab Styles (posts/index.html & Related Posts)
   ========================================================================== */
.featured-card {
  background: linear-gradient(135deg, rgba(24, 24, 27, 0.9) 0%, rgba(18, 18, 23, 0.95) 100%);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-lg);
  padding: 32px;
  margin-bottom: 40px;
  position: relative;
  overflow: hidden;
  transition: border-color 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
}

.featured-card:hover {
  border-color: var(--accent-blue);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.4);
  transform: translateY(-2px);
}

.featured-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(59, 130, 246, 0.15);
  border: 1px solid rgba(59, 130, 246, 0.35);
  color: var(--accent-blue);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: 9999px;
  margin-bottom: 16px;
}

.featured-title {
  font-size: 1.6rem;
  font-weight: 700;
  line-height: 1.35;
  margin-bottom: 14px;
}

.featured-title a {
  color: var(--text-primary);
  text-decoration: none;
  transition: color 0.15s ease;
}

.featured-title a:hover {
  color: var(--accent-blue);
}

.featured-excerpt {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.7;
  margin-bottom: 20px;
  max-width: 820px;
}

.featured-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  padding-top: 18px;
  border-top: 1px solid var(--border-subtle);
}

.post-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 24px;
  margin-bottom: 50px;
}

.post-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.post-card:hover {
  border-color: var(--border-strong);
  transform: translateY(-2px);
}

.post-card-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-bottom: 12px;
}

.post-card-badge {
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 0.72rem;
  text-transform: uppercase;
}

.post-card-badge.blue {
  background: rgba(59, 130, 246, 0.12);
  color: var(--accent-blue);
  border: 1px solid rgba(59, 130, 246, 0.25);
}

.post-card-badge.amber {
  background: rgba(245, 158, 11, 0.12);
  color: var(--accent-amber);
  border: 1px solid rgba(245, 158, 11, 0.25);
}

.post-card-badge.green {
  background: rgba(16, 185, 129, 0.12);
  color: var(--accent-green);
  border: 1px solid rgba(16, 185, 129, 0.25);
}

.post-card-title {
  font-size: 1.15rem;
  font-weight: 700;
  line-height: 1.45;
  margin-bottom: 12px;
}

.post-card-title a {
  color: var(--text-primary);
  text-decoration: none;
  transition: color 0.15s ease;
}

.post-card-title a:hover {
  color: var(--accent-blue);
}

.post-card-excerpt {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 20px;
}

.post-card-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-primary);
  text-decoration: none;
  transition: gap 0.15s ease, color 0.15s ease;
}

.post-card-link:hover {
  color: var(--accent-blue);
  gap: 10px;
}

.related-posts-section {
  margin: 50px 0 20px;
  padding-top: 36px;
  border-top: 1px solid var(--border-subtle);
}

.related-posts-title {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 8px;
}

/* ==========================================================================
   2026Q4 专线巡检时效看板 & 场景选型矩阵
   ========================================================================== */
.live-pulse-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--accent-green, #10b981);
  box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7);
  animation: livePulse 2s infinite cubic-bezier(0.4, 0, 0.6, 1);
  margin-right: 6px;
  vertical-align: middle;
}

@keyframes livePulse {
  0% {
    transform: scale(0.95);
    box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7);
  }
  70% {
    transform: scale(1);
    box-shadow: 0 0 0 7px rgba(16, 185, 129, 0);
  }
  100% {
    transform: scale(0.95);
    box-shadow: 0 0 0 0 rgba(16, 185, 129, 0);
  }
}

.realtime-dashboard {
  background: linear-gradient(180deg, rgba(24, 24, 27, 0.75) 0%, rgba(9, 9, 11, 0.85) 100%);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 20px 24px;
  margin-bottom: 28px;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.realtime-dashboard-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border-subtle);
  margin-bottom: 16px;
}

.realtime-status-badge {
  display: inline-flex;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text-primary);
  background: rgba(16, 185, 129, 0.08);
  border: 1px solid rgba(16, 185, 129, 0.25);
  padding: 5px 14px;
  border-radius: var(--radius-full);
}

.realtime-metrics-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

@media (max-width: 900px) {
  .realtime-metrics-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 520px) {
  .realtime-metrics-grid {
    grid-template-columns: 1fr;
  }
}

.realtime-metric-box {
  background: var(--bg-primary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 14px 18px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.realtime-metric-box:hover {
  border-color: var(--border-strong);
  transform: translateY(-2px);
}

.realtime-metric-label {
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.realtime-metric-value {
  font-size: 1.35rem;
  font-weight: 800;
  font-family: var(--font-mono);
  letter-spacing: -0.02em;
}

/* 场景精准选型卡片 */
.scenario-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

@media (max-width: 768px) {
  .scenario-grid {
    grid-template-columns: 1fr;
  }
}

.scenario-card {
  background: linear-gradient(180deg, rgba(24, 24, 27, 0.55) 0%, rgba(15, 15, 18, 0.85) 100%);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: border-color 0.25s ease, transform 0.25s ease, box-shadow 0.25s ease;
}

.scenario-card:hover {
  border-color: var(--border-strong);
  transform: translateY(-3px);
  box-shadow: 0 12px 30px -10px rgba(0, 0, 0, 0.6);
}

.scenario-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.75rem;
  font-family: var(--font-mono);
  padding: 3px 8px;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  margin-bottom: 12px;
}

.scenario-title {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--text-primary);
}

.scenario-painpoint {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 16px;
}

.scenario-recommendation {
  background: rgba(9, 9, 11, 0.65);
  border: 1px dashed var(--border-strong);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  font-size: 0.85rem;
  margin-bottom: 18px;
}

.scenario-links {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  align-items: center;
}

/* ==========================================================================
   全局 Toast 悬浮提示与优惠码一键点击复制微交互 (右上角精致深色卡片)
   ========================================================================== */
#global-toast,
.toast {
  position: fixed;
  top: 24px;
  right: 24px;
  transform: translateY(-16px);
  background: rgba(18, 18, 22, 0.96);
  border: 1px solid rgba(16, 185, 129, 0.45);
  box-shadow: 0 12px 32px -4px rgba(0, 0, 0, 0.75), 0 0 20px rgba(16, 185, 129, 0.25);
  border-radius: var(--radius-md, 8px);
  padding: 12px 20px;
  display: flex;
  align-items: center;
  gap: 10px;
  z-index: 999999;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s cubic-bezier(0.16, 1, 0.3, 1), transform 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-primary, #ffffff);
  white-space: nowrap;
  max-width: 90vw;
}

#global-toast.show,
.toast.show {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

@media (max-width: 540px) {
  #global-toast,
  .toast {
    top: 16px;
    right: 16px;
    left: 16px;
    justify-content: center;
    white-space: normal;
    text-align: center;
  }
}

/* 优惠码 code 标签点击复制交互 */
.copyable-coupon-code {
  cursor: pointer !important;
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 2px 7px;
  border-radius: 4px;
  border: 1px dashed rgba(245, 158, 11, 0.5) !important;
  background: rgba(245, 158, 11, 0.12) !important;
  color: var(--accent-amber, #f59e0b) !important;
  font-weight: 700;
  font-family: var(--font-mono, monospace);
  transition: all 0.2s ease;
  user-select: all;
}

.copyable-coupon-code::after {
  content: '📋';
  font-size: 0.75rem;
  opacity: 0.65;
  transition: opacity 0.2s ease;
}

.copyable-coupon-code:hover {
  background: rgba(245, 158, 11, 0.22) !important;
  border-color: var(--accent-amber, #f59e0b) !important;
  box-shadow: 0 0 10px rgba(245, 158, 11, 0.3);
  transform: translateY(-1px);
}

.copyable-coupon-code:hover::after {
  opacity: 1;
}

.copyable-coupon-code:active {
  transform: scale(0.96);
}

.code-copied-pulse {
  animation: copyPulse 0.45s ease-out;
  border-color: var(--accent-green, #10b981) !important;
  color: var(--accent-green, #10b981) !important;
  background: rgba(16, 185, 129, 0.18) !important;
}

@keyframes copyPulse {
  0% { transform: scale(1); }
  50% { transform: scale(1.15); box-shadow: 0 0 14px rgba(16, 185, 129, 0.6); }
  100% { transform: scale(1); }
}

/* 优惠码列表页中的复制行 */
.coupon-copy-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(0, 0, 0, 0.4);
  border: 1px dashed var(--border-strong, #3f3f46);
  border-radius: var(--radius-md, 8px);
  padding: 8px 14px;
  margin-bottom: 12px;
}

.coupon-code-text {
  font-family: var(--font-mono, monospace);
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--accent-amber, #f59e0b);
  letter-spacing: 0.05em;
}

.btn-copy {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid var(--border-subtle, #27272a);
  color: var(--text-primary, #ffffff);
  border-radius: var(--radius-sm, 4px);
  padding: 5px 12px;
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
}

.btn-copy:hover {
  background: rgba(16, 185, 129, 0.15);
  border-color: var(--accent-green, #10b981);
  color: var(--accent-green, #10b981);
}

.btn-copy.copied {
  background: var(--accent-green, #10b981) !important;
  color: #000000 !important;
  border-color: var(--accent-green, #10b981) !important;
}