@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&family=JetBrains+Mono:wght@400;500;700&display=swap');

/* ==========================================================================
   DEFAULT THEME: LIGHT MODE (Crisp, High-Contrast Modern SaaS)
   ========================================================================== */
:root {
  --bg-primary: #f8fafc;
  --bg-surface: #ffffff;
  --bg-card: #ffffff;
  --bg-card-subtle: #f1f5f9;
  --bg-card-hover: #e2e8f0;
  --bg-glass: rgba(255, 255, 255, 0.9);
  --bg-input: #ffffff;
  --border-input: #cbd5e1;
  
  --text-primary: #0f172a;
  --text-secondary: #334155;
  --text-muted: #64748b;
  --text-dim: #94a3b8;
  
  --accent-cyan: #0284c7;
  --accent-cyan-light: #0369a1;
  --accent-cyan-glow: rgba(2, 132, 199, 0.15);
  --accent-blue: #2563eb;
  --accent-green: #059669;
  --accent-green-glow: rgba(5, 150, 105, 0.15);
  --accent-gold: #d97706;
  --accent-purple: #7c3aed;
  --accent-red: #dc2626;
  
  --border-subtle: rgba(15, 23, 42, 0.08);
  --border-glass: rgba(15, 23, 42, 0.12);
  --border-accent: rgba(2, 132, 199, 0.35);
  
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  
  --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.06), 0 1px 2px rgba(15, 23, 42, 0.04);
  --shadow-md: 0 4px 16px -2px rgba(15, 23, 42, 0.08), 0 2px 6px -1px rgba(15, 23, 42, 0.04);
  --shadow-lg: 0 12px 32px -4px rgba(15, 23, 42, 0.12), 0 4px 12px -2px rgba(15, 23, 42, 0.06);
  --shadow-glow: 0 0 25px rgba(2, 132, 199, 0.15);
  
  --transition-fast: 0.18s ease;
  --transition-smooth: 0.3s ease;
  
  --bg-pattern: 
    radial-gradient(circle at 50% 0%, rgba(2, 132, 199, 0.07) 0%, transparent 45%),
    radial-gradient(circle at 90% 40%, rgba(37, 99, 235, 0.04) 0%, transparent 35%),
    radial-gradient(circle at 10% 70%, rgba(124, 58, 237, 0.03) 0%, transparent 35%),
    linear-gradient(to right, rgba(15, 23, 42, 0.03) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(15, 23, 42, 0.03) 1px, transparent 1px);
}

/* ==========================================================================
   DARK MODE OVERRIDES
   ========================================================================== */
[data-theme="dark"] {
  --bg-primary: #040814;
  --bg-surface: #0a1024;
  --bg-card: #0c142e;
  --bg-card-subtle: rgba(12, 20, 46, 0.7);
  --bg-card-hover: #142044;
  --bg-glass: rgba(14, 23, 51, 0.88);
  --bg-input: #080e22;
  --border-input: rgba(255, 255, 255, 0.16);
  
  --text-primary: #ffffff;
  --text-secondary: #cbd5e1;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  
  --accent-cyan: #38bdf8;
  --accent-cyan-light: #7dd3fc;
  --accent-cyan-glow: rgba(56, 189, 248, 0.25);
  --accent-blue: #3b82f6;
  --accent-green: #10b981;
  --accent-green-glow: rgba(16, 185, 129, 0.2);
  --accent-gold: #fbbf24;
  --accent-purple: #c084fc;
  --accent-red: #f87171;
  
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-glass: rgba(255, 255, 255, 0.12);
  --border-accent: rgba(56, 189, 248, 0.35);
  
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 8px 24px -4px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 20px 40px -10px rgba(0, 0, 0, 0.6);
  --shadow-glow: 0 0 35px -5px var(--accent-cyan-glow);
  
  --bg-pattern: 
    radial-gradient(circle at 50% 0%, rgba(56, 189, 248, 0.12) 0%, transparent 45%),
    radial-gradient(circle at 90% 40%, rgba(37, 99, 235, 0.06) 0%, transparent 35%),
    radial-gradient(circle at 10% 70%, rgba(192, 132, 252, 0.04) 0%, transparent 35%),
    linear-gradient(to right, rgba(255, 255, 255, 0.015) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255, 255, 255, 0.015) 1px, transparent 1px);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.65;
  overflow-x: hidden;
  position: relative;
  -webkit-font-smoothing: antialiased;
  transition: background-color var(--transition-smooth), color var(--transition-smooth);
}

/* Background Atmosphere */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background-image: var(--bg-pattern);
  background-size: 100% 100%, 100% 100%, 100% 100%, 64px 64px, 64px 64px;
  z-index: -2;
  pointer-events: none;
  transition: opacity var(--transition-smooth);
}

/* Top Velocity Ticker */
.top-ticker {
  background: var(--bg-card-subtle);
  border-bottom: 1px solid var(--border-subtle);
  padding: 10px 24px;
  font-size: 0.88rem;
  color: var(--text-secondary);
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 28px;
  flex-wrap: wrap;
  z-index: 120;
}

.ticker-item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.ticker-item svg {
  color: var(--accent-cyan);
  flex-shrink: 0;
}

.ticker-item strong {
  color: var(--text-primary);
  font-weight: 700;
}

.live-dot {
  width: 8px;
  height: 8px;
  background: var(--accent-green);
  border-radius: 50%;
  box-shadow: 0 0 10px var(--accent-green);
  animation: pulse-dot 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.35; transform: scale(0.8); }
}

/* Header & Navigation Bar */
header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.15rem 6%;
  background: var(--bg-glass);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 1px solid var(--border-subtle);
}

.logo-container {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  text-decoration: none;
  color: var(--text-primary);
  font-weight: 900;
  font-size: 1.35rem;
  letter-spacing: -0.5px;
  z-index: 2;
}

.logo-img {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  border: 1px solid var(--border-glass);
}

/* Centered Navigation Links */
.nav-links {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 2.25rem;
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
}

.nav-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 600;
  transition: color var(--transition-fast);
  position: relative;
  white-space: nowrap;
}

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

.nav-links a.active::after {
  content: '';
  position: absolute;
  bottom: -6px;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--accent-cyan);
  border-radius: 2px;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  z-index: 2;
}

/* Theme Toggle Button */
.theme-toggle-btn {
  background: var(--bg-card-subtle);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  width: 40px;
  height: 40px;
  border-radius: 10px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: background var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast);
}

.theme-toggle-btn:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-accent);
  transform: scale(1.05);
}

.theme-icon-sun {
  display: none;
}

.theme-icon-moon {
  display: block;
}

[data-theme="dark"] .theme-icon-sun {
  display: block;
}

[data-theme="dark"] .theme-icon-moon {
  display: none;
}

.nav-cta {
  background: linear-gradient(135deg, #0284c7 0%, #0369a1 100%);
  color: #ffffff !important;
  font-weight: 700 !important;
  font-size: 0.92rem;
  padding: 10px 20px;
  border-radius: 12px;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  box-shadow: 0 4px 16px var(--accent-cyan-glow);
  transition: opacity var(--transition-fast), transform var(--transition-fast);
}

[data-theme="dark"] .nav-cta {
  background: linear-gradient(135deg, #38bdf8 0%, #0284c7 100%);
  color: #040814 !important;
  font-weight: 800 !important;
}

.nav-cta:hover {
  opacity: 0.92;
}

/* Mobile Menu Button & Drawer */
.mobile-menu-btn {
  display: none;
  background: transparent;
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  padding: 8px;
  border-radius: 10px;
  cursor: pointer;
}

.mobile-drawer {
  display: none;
  position: fixed;
  top: 72px;
  left: 0;
  width: 100vw;
  background: var(--bg-glass);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border-bottom: 1px solid var(--border-subtle);
  padding: 24px 6%;
  flex-direction: column;
  gap: 18px;
  z-index: 99;
}

.mobile-drawer.open {
  display: flex;
}

.mobile-drawer a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 1.1rem;
  font-weight: 600;
  padding: 8px 0;
}

/* Hero Section */
.hero {
  text-align: center;
  padding: 5.5rem 6% 3.5rem;
  max-width: 1140px;
  margin: 0 auto;
  position: relative;
}

.trust-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(2, 132, 199, 0.08);
  border: 1px solid rgba(2, 132, 199, 0.25);
  padding: 8px 20px;
  border-radius: 50px;
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--accent-cyan);
  margin-bottom: 1.75rem;
}

[data-theme="dark"] .trust-badge {
  background: rgba(56, 189, 248, 0.08);
  border-color: rgba(56, 189, 248, 0.35);
}

.hero h1 {
  font-size: 3.5rem;
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: -1.8px;
  margin-bottom: 1.5rem;
  color: var(--text-primary);
}

.highlight {
  background: linear-gradient(135deg, var(--accent-cyan) 0%, #0284c7 50%, var(--accent-purple) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero p {
  font-size: 1.25rem;
  color: var(--text-secondary);
  max-width: 780px;
  margin: 0 auto 2.75rem;
  line-height: 1.75;
}

.cta-group {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 18px;
  flex-wrap: wrap;
  margin-bottom: 3.5rem;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: linear-gradient(135deg, #0284c7 0%, #0369a1 100%);
  color: #ffffff !important;
  font-weight: 800;
  font-size: 1.05rem;
  padding: 16px 32px;
  border-radius: 14px;
  text-decoration: none;
  border: none;
  cursor: pointer;
  box-shadow: var(--shadow-md), 0 4px 20px var(--accent-cyan-glow);
  transition: opacity var(--transition-fast), box-shadow var(--transition-fast);
}

[data-theme="dark"] .btn-primary {
  background: linear-gradient(135deg, #38bdf8 0%, #0284c7 100%);
  color: #040814 !important;
}

.btn-primary:hover {
  opacity: 0.94;
  box-shadow: 0 6px 30px var(--accent-cyan-glow);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: var(--bg-card);
  color: var(--text-primary) !important;
  font-weight: 700;
  font-size: 1.05rem;
  padding: 16px 28px;
  border-radius: 14px;
  text-decoration: none;
  border: 1px solid var(--border-subtle);
  box-shadow: var(--shadow-sm);
  transition: background-color var(--transition-fast), border-color var(--transition-fast);
}

.btn-secondary:hover {
  background: var(--bg-card-hover);
  border-color: var(--accent-cyan);
}

/* Ambient Hero Live Simulation Card */
.hero-live-preview {
  max-width: 920px;
  margin: 0 auto 3rem;
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-xl);
  padding: 2.25rem 2.5rem;
  box-shadow: var(--shadow-lg), 0 0 50px -10px var(--accent-cyan-glow);
  animation: subtle-float 6s ease-in-out infinite;
  text-align: left;
}

@keyframes subtle-float {
  0%, 100% { transform: translateY(0px); }
  50% { transform: translateY(-6px); }
}

.preview-top-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border-subtle);
  margin-bottom: 1.75rem;
  flex-wrap: wrap;
  gap: 12px;
}

.preview-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  border-radius: 20px;
  background: rgba(5, 150, 105, 0.12);
  color: var(--accent-green);
  border: 1px solid rgba(5, 150, 105, 0.35);
  font-size: 0.85rem;
  font-weight: 700;
}

.progress-track-wrapper {
  margin-bottom: 1.75rem;
}

.progress-label-row {
  display: flex;
  justify-content: space-between;
  font-size: 0.92rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--text-primary);
}

.progress-bar-bg {
  width: 100%;
  height: 10px;
  background: var(--bg-card-hover);
  border-radius: 10px;
  overflow: hidden;
  position: relative;
}

.progress-bar-fill {
  width: 85%;
  height: 100%;
  background: linear-gradient(90deg, var(--accent-cyan) 0%, var(--accent-green) 100%);
  border-radius: 10px;
  position: relative;
}

.preview-testers-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 14px;
}

.tester-chip {
  background: var(--bg-card-subtle);
  border: 1px solid var(--border-subtle);
  border-radius: 12px;
  padding: 12px 14px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.9rem;
}

.tester-chip strong {
  color: var(--text-primary);
}

.tester-avatar-info {
  display: flex;
  align-items: center;
  gap: 10px;
}

.tester-avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--bg-card-hover);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
  font-weight: 800;
  color: var(--accent-cyan);
  border: 1px solid var(--border-subtle);
}

.tester-status-tag {
  color: var(--accent-green);
  font-size: 0.78rem;
  font-weight: 700;
  background: rgba(5, 150, 105, 0.1);
  padding: 4px 8px;
  border-radius: 6px;
}

/* Sections Global */
section {
  padding: 5.5rem 6%;
  max-width: 1240px;
  margin: 0 auto;
}

.section-header {
  text-align: center;
  max-width: 740px;
  margin: 0 auto 3.75rem;
}

.section-header h2 {
  font-size: 2.4rem;
  font-weight: 900;
  letter-spacing: -1px;
  margin-bottom: 0.85rem;
  color: var(--text-primary);
}

.section-header p {
  color: var(--text-secondary);
  font-size: 1.12rem;
  line-height: 1.7;
}

/* Connected Horizontal Workflow Timeline */
.timeline-track {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  position: relative;
}

.timeline-step {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 2.25rem 2rem;
  box-shadow: var(--shadow-sm);
}

.timeline-step-num {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.88rem;
  font-weight: 800;
  color: var(--accent-cyan);
  background: rgba(2, 132, 199, 0.1);
  padding: 4px 12px;
  border-radius: 6px;
  display: inline-block;
  margin-bottom: 1.25rem;
  border: 1px solid rgba(2, 132, 199, 0.25);
}

.timeline-step h3 {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 0.75rem;
}

.timeline-step p {
  color: var(--text-secondary);
  font-size: 0.98rem;
  line-height: 1.7;
}

/* Split Showcase Feature Sections */
.split-showcase {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
  margin-bottom: 5rem;
}

.split-showcase.reverse {
  direction: rtl;
}

.split-showcase.reverse .split-content {
  direction: ltr;
}

.split-showcase.reverse .split-visual {
  direction: ltr;
}

.split-content .tag-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.82rem;
  font-weight: 800;
  color: var(--accent-cyan);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 1rem;
}

.split-content h2 {
  font-size: 2.3rem;
  font-weight: 900;
  line-height: 1.2;
  letter-spacing: -1px;
  margin-bottom: 1.25rem;
  color: var(--text-primary);
}

.split-content p {
  color: var(--text-secondary);
  font-size: 1.05rem;
  line-height: 1.75;
  margin-bottom: 1.5rem;
}

.feature-checklist {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.feature-checklist li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  color: var(--text-secondary);
  font-size: 0.98rem;
  line-height: 1.6;
}

.feature-checklist svg {
  color: var(--accent-cyan);
  flex-shrink: 0;
  margin-top: 3px;
}

.split-visual {
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-xl);
  padding: 2.25rem;
  box-shadow: var(--shadow-md);
}

/* Stake Monitor UI Element */
.stake-monitor-box {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.stake-card-item {
  background: var(--bg-card-subtle);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1rem 1.25rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.stake-card-item strong {
  color: var(--text-primary);
}

.stake-icon-label {
  display: flex;
  align-items: center;
  gap: 12px;
}

.stake-icon-label svg {
  color: var(--accent-gold);
}

.stake-badge-active {
  color: var(--accent-green);
  font-weight: 800;
  font-size: 0.85rem;
  background: rgba(5, 150, 105, 0.12);
  padding: 4px 10px;
  border-radius: 6px;
}

/* Device Telemetry Grid */
.device-telemetry-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.device-telemetry-item {
  background: var(--bg-card-subtle);
  border: 1px solid var(--border-subtle);
  border-radius: 10px;
  padding: 12px;
  font-size: 0.88rem;
}

.device-telemetry-item strong {
  display: block;
  color: var(--text-primary);
  margin-bottom: 2px;
}

.device-telemetry-item span {
  color: var(--accent-cyan);
  font-size: 0.78rem;
  font-family: 'JetBrains Mono', monospace;
}

/* Comparison Table */
.table-container {
  overflow-x: auto;
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-subtle);
  box-shadow: var(--shadow-md);
}

table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
}

th, td {
  padding: 1.4rem 1.75rem;
  border-bottom: 1px solid var(--border-subtle);
}

th {
  background: var(--bg-card-subtle);
  color: var(--text-primary);
  font-size: 0.92rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 1px;
}

td {
  font-size: 1.02rem;
  color: var(--text-secondary);
}

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

/* Knowledge Hub Featured Showcase */
.knowledge-showcase {
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  gap: 32px;
}

.featured-guide-card {
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  padding: 2.75rem 2.25rem;
  text-decoration: none;
  color: inherit;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  box-shadow: var(--shadow-sm);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.featured-guide-card:hover {
  border-color: var(--accent-cyan);
  box-shadow: var(--shadow-md);
}

.featured-guide-card h3 {
  font-size: 1.65rem;
  font-weight: 800;
  line-height: 1.35;
  color: var(--text-primary);
  margin: 1rem 0;
}

.featured-guide-card p {
  color: var(--text-secondary);
  font-size: 1.05rem;
  line-height: 1.75;
  margin-bottom: 2rem;
}

.guide-list-side {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.guide-list-item {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.5rem 1.75rem;
  text-decoration: none;
  color: inherit;
  display: block;
  box-shadow: var(--shadow-sm);
  transition: border-color var(--transition-fast);
}

.guide-list-item:hover {
  border-color: var(--accent-cyan);
}

.guide-list-item h4 {
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
  line-height: 1.4;
}

.guide-list-item p {
  color: var(--text-muted);
  font-size: 0.92rem;
  line-height: 1.6;
}

/* Interactive Calculator Container */
.calculator-card {
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-xl);
  padding: 3rem;
  max-width: 840px;
  margin: 0 auto;
  box-shadow: var(--shadow-lg);
}

.form-group {
  margin-bottom: 2rem;
}

.form-label {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  font-size: 1rem;
  margin-bottom: 0.75rem;
  color: var(--text-primary);
}

.form-label svg {
  color: var(--accent-cyan);
}

.form-select, .form-input {
  width: 100%;
  background-color: var(--bg-input);
  border: 1px solid var(--border-input);
  padding: 15px 20px;
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 1.02rem;
  font-weight: 600;
  font-family: inherit;
  outline: none;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  appearance: none;
  -webkit-appearance: none;
}

.form-select:focus, .form-input:focus {
  border-color: var(--accent-cyan);
  box-shadow: 0 0 0 3px var(--accent-cyan-glow);
}

.form-select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='18' height='18' viewBox='0 0 24 24' fill='none' stroke='%230284c7' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 20px center;
  background-size: 20px;
  padding-right: 54px;
  cursor: pointer;
}

.form-select option {
  background-color: var(--bg-card) !important;
  color: var(--text-primary) !important;
  padding: 16px;
  font-size: 1rem;
  font-weight: 600;
}

.calc-results {
  margin-top: 2.25rem;
  padding-top: 2.25rem;
  border-top: 1px solid var(--border-subtle);
  display: none;
}

.score-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 18px;
  border-radius: 10px;
  font-weight: 800;
  font-size: 1.1rem;
  margin-bottom: 1.25rem;
}

/* ==========================================================================
   Article Reading Experience (Pristine Typography & Clean Centered Layout)
   ========================================================================== */
.article-container {
  max-width: 860px;
  margin: 0 auto;
  padding: 3rem 6% 6rem;
  position: relative;
}

.article-header {
  margin-bottom: 2.75rem;
  padding-bottom: 2.25rem;
  border-bottom: 1px solid var(--border-subtle);
}

.article-header h1 {
  font-size: 2.75rem;
  font-weight: 900;
  line-height: 1.2;
  letter-spacing: -1.2px;
  margin: 1.15rem 0 1rem;
  color: var(--text-primary);
}

.blog-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.82rem;
  font-weight: 800;
  color: var(--accent-cyan);
  background: rgba(2, 132, 199, 0.1);
  border: 1px solid rgba(2, 132, 199, 0.3);
  padding: 4px 12px;
  border-radius: 20px;
  text-transform: uppercase;
  letter-spacing: 1px;
}

[data-theme="dark"] .blog-tag {
  background: rgba(56, 189, 248, 0.1);
  border-color: rgba(56, 189, 248, 0.3);
}

.blog-meta {
  font-size: 0.92rem;
  color: var(--text-muted);
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 8px;
}

.article-body {
  font-size: 1.12rem;
  line-height: 1.85;
  color: var(--text-secondary);
}

.article-body h2 {
  font-size: 1.95rem;
  font-weight: 900;
  color: var(--text-primary);
  letter-spacing: -0.75px;
  margin: 3.5rem 0 1.25rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--border-subtle);
}

.article-body h2:first-of-type {
  border-top: none;
  padding-top: 0;
  margin-top: 2rem;
}

.article-body h3 {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.4px;
  margin: 2.25rem 0 0.85rem;
}

.article-body p {
  margin-bottom: 1.65rem;
  color: var(--text-secondary);
}

.article-body strong {
  color: var(--text-primary);
  font-weight: 700;
}

.article-body ul, .article-body ol {
  margin-bottom: 1.75rem;
  padding-left: 1.85rem;
}

.article-body li {
  margin-bottom: 0.75rem;
  color: var(--text-secondary);
  line-height: 1.75;
}

.article-body a {
  color: var(--accent-cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
  font-weight: 600;
  transition: color var(--transition-fast);
}

.article-body a:hover {
  color: var(--accent-cyan-light);
}

.article-callout {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-left: 4px solid var(--accent-cyan);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  padding: 1.75rem 2rem;
  margin: 2.75rem 0;
  box-shadow: var(--shadow-sm);
}

.article-callout h3 {
  color: var(--text-primary);
  margin-top: 0;
  margin-bottom: 0.5rem;
  font-size: 1.25rem;
}

.article-callout p {
  margin-bottom: 0;
  color: var(--text-secondary);
  font-size: 1.02rem;
  line-height: 1.7;
}

/* FAQ Accordion */
.faq-container {
  max-width: 820px;
  margin: 0 auto;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  margin-bottom: 16px;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: border-color var(--transition-fast), background-color var(--transition-fast);
}

.faq-item.active {
  border-color: var(--accent-cyan);
}

.faq-question {
  width: 100%;
  padding: 1.4rem 1.75rem;
  text-align: left;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 1.12rem;
  font-weight: 700;
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
}

.faq-question svg {
  transition: transform 0.35s ease;
  color: var(--accent-cyan);
  flex-shrink: 0;
}

.faq-item.active .faq-question svg {
  transform: rotate(180deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s cubic-bezier(0, 1, 0, 1);
  padding: 0 1.75rem;
  color: var(--text-secondary);
  font-size: 1.02rem;
  line-height: 1.75;
}

.faq-item.active .faq-answer {
  max-height: 400px;
  padding-bottom: 1.4rem;
}

/* Conversion Banner */
.conversion-banner {
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-xl);
  padding: 4.5rem 3rem;
  text-align: center;
  box-shadow: var(--shadow-lg), 0 0 50px -10px var(--accent-cyan-glow);
  position: relative;
  overflow: hidden;
}

.conversion-banner h2 {
  font-size: 2.8rem;
  font-weight: 900;
  letter-spacing: -1.2px;
  margin-bottom: 1.25rem;
  color: var(--text-primary);
}

.conversion-banner p {
  color: var(--text-secondary);
  font-size: 1.2rem;
  max-width: 680px;
  margin: 0 auto 2.5rem;
  line-height: 1.75;
}

/* Blog Featured Hero Showcase */
.blog-featured-hero {
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-xl);
  padding: 2.75rem;
  margin-bottom: 3.5rem;
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 3rem;
  align-items: center;
  box-shadow: var(--shadow-lg), 0 0 40px -10px var(--accent-cyan-glow);
  text-decoration: none;
  color: inherit;
  transition: transform var(--transition-fast), border-color var(--transition-fast);
}

.blog-featured-hero:hover {
  border-color: var(--accent-cyan);
  transform: translateY(-2px);
}

.featured-hero-visual {
  background: var(--bg-card-subtle);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
  min-height: 240px;
}

.featured-hero-visual svg {
  max-width: 100%;
  height: auto;
  filter: drop-shadow(0 10px 20px var(--accent-cyan-glow));
}

.featured-hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(2, 132, 199, 0.12);
  color: var(--accent-cyan);
  border: 1px solid var(--border-accent);
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 0.82rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 1.25rem;
}

.blog-featured-hero h2 {
  font-size: 2.2rem;
  font-weight: 900;
  line-height: 1.25;
  color: var(--text-primary);
  margin-bottom: 1rem;
  letter-spacing: -0.75px;
}

.blog-featured-hero p {
  color: var(--text-secondary);
  font-size: 1.08rem;
  line-height: 1.75;
  margin-bottom: 1.75rem;
}

/* Blog Archive Grid */
.blog-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 32px;
}

.blog-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  overflow: hidden;
  text-decoration: none;
  color: inherit;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.blog-card:hover {
  transform: translateY(-4px);
  border-color: var(--accent-cyan);
  box-shadow: var(--shadow-md), 0 0 25px -5px var(--accent-cyan-glow);
}

/* Blog Card Cover Graphic */
.blog-card-cover {
  height: 160px;
  background: var(--bg-card-subtle);
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.blog-card-cover svg {
  width: 72px;
  height: 72px;
  color: var(--accent-cyan);
  transition: transform var(--transition-smooth);
}

.blog-card:hover .blog-card-cover svg {
  transform: scale(1.08);
}

.blog-card-body {
  padding: 2rem 1.75rem 2.25rem;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
  justify-content: space-between;
}

.blog-card h3 {
  font-size: 1.3rem;
  font-weight: 800;
  line-height: 1.4;
  color: var(--text-primary);
  margin: 0.85rem 0;
}

.blog-card p {
  color: var(--text-secondary);
  font-size: 0.98rem;
  line-height: 1.7;
  margin-bottom: 1.5rem;
  flex-grow: 1;
}

/* Article Hero Visual Banner */
.article-hero-banner {
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  padding: 2.5rem 2rem;
  margin: 2rem 0 3rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  box-shadow: var(--shadow-sm);
  position: relative;
  overflow: hidden;
}

.article-hero-banner svg {
  color: var(--accent-cyan);
  margin-bottom: 1rem;
}

.article-hero-banner span {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 1px;
}

/* Footer */
footer {
  background: var(--bg-card);
  border-top: 1px solid var(--border-subtle);
  padding: 4.5rem 6% 3rem;
  margin-top: 6rem;
}

.footer-content {
  display: grid;
  grid-template-columns: 2fr repeat(3, 1fr);
  gap: 3rem;
  max-width: 1240px;
  margin: 0 auto 3.5rem;
}

.footer-col h4 {
  font-size: 1rem;
  font-weight: 800;
  letter-spacing: 0.5px;
  color: var(--text-primary);
  margin-bottom: 1.35rem;
}

.footer-col ul {
  list-style: none;
}

.footer-col li {
  margin-bottom: 0.85rem;
}

.footer-col a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  transition: color var(--transition-fast);
}

.footer-col a:hover {
  color: var(--accent-cyan);
}

.copyright {
  text-align: center;
  color: var(--text-dim);
  font-size: 0.9rem;
  padding-top: 2.25rem;
  border-top: 1px solid var(--border-subtle);
}

/* Reading Progress Indicator */
.scroll-progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  width: 0%;
  background: linear-gradient(90deg, var(--accent-cyan), var(--accent-green));
  z-index: 1000;
  transition: width 0.1s ease-out;
}

/* Breadcrumb Navigation */
.breadcrumbs {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
}

.breadcrumbs a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.breadcrumbs a:hover {
  color: var(--accent-cyan);
}

.breadcrumbs span.current {
  color: var(--text-primary);
  font-weight: 600;
}

.breadcrumbs svg {
  color: var(--text-dim);
  flex-shrink: 0;
}

/* Quick Jump / Table of Contents Anchor Bar */
.toc-bar {
  display: flex;
  gap: 10px;
  overflow-x: auto;
  padding: 12px 0;
  margin: 1.5rem 0 2.5rem;
  border-bottom: 1px solid var(--border-subtle);
  scrollbar-width: none;
}

.toc-bar::-webkit-scrollbar {
  display: none;
}

.toc-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--bg-card-subtle);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  font-size: 0.85rem;
  font-weight: 600;
  padding: 6px 14px;
  border-radius: 20px;
  text-decoration: none;
  white-space: nowrap;
  transition: all var(--transition-fast);
}

.toc-pill:hover {
  background: var(--bg-card-hover);
  color: var(--text-primary);
  border-color: var(--border-accent);
}

/* Blog Filter Pills Bar */
.filter-bar {
  display: flex;
  justify-content: center;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 3rem;
}

.filter-pill {
  background: var(--bg-card-subtle);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  font-size: 0.92rem;
  font-weight: 600;
  padding: 10px 20px;
  border-radius: 50px;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.filter-pill:hover, .filter-pill.active {
  background: rgba(2, 132, 199, 0.12);
  color: var(--accent-cyan);
  border-color: var(--accent-cyan);
}

/* Copy to Clipboard Button */
.copy-box-wrapper {
  position: relative;
}

.copy-btn {
  position: absolute;
  top: 12px;
  right: 12px;
  background: var(--bg-card-subtle);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  font-size: 0.8rem;
  font-weight: 700;
  padding: 6px 12px;
  border-radius: 8px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: all var(--transition-fast);
}

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

.copy-btn.copied {
  background: rgba(5, 150, 105, 0.15);
  color: var(--accent-green);
  border-color: var(--accent-green);
}

/* Floating Back to Top Button */
.back-to-top {
  position: fixed;
  bottom: 28px;
  right: 28px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  color: var(--accent-cyan);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: var(--shadow-md);
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity 0.3s ease, visibility 0.3s ease, transform 0.3s ease;
  z-index: 90;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  background: var(--bg-card-hover);
  border-color: var(--accent-cyan);
}

/* Mobile Responsive Optimization */
@media (max-width: 1024px) {
  .nav-links { display: none; }
  .mobile-menu-btn { display: block; }
  .nav-actions .nav-cta { display: none; }
  .timeline-track { grid-template-columns: 1fr; gap: 20px; }
  .split-showcase, .split-showcase.reverse { grid-template-columns: 1fr; gap: 2.5rem; }
  .knowledge-showcase { grid-template-columns: 1fr; }
  .footer-content { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  header { padding: 1rem 5%; }
  .hero { padding: 3.5rem 5% 2rem; }
  .hero h1 { font-size: 2.2rem; }
  .hero p { font-size: 1.05rem; }
  .hero-live-preview { padding: 1.5rem; }
  .preview-testers-row { grid-template-columns: 1fr; }
  .split-content h2 { font-size: 1.85rem; }
  .conversion-banner { padding: 2.5rem 1.5rem; }
  .conversion-banner h2 { font-size: 1.95rem; }
  section { padding: 3.5rem 5%; }
  .section-header h2 { font-size: 2rem; }
  .cta-group { flex-direction: column; width: 100%; }
  .btn-primary, .btn-secondary { width: 100%; justify-content: center; }
  .back-to-top { bottom: 20px; right: 20px; width: 40px; height: 40px; }
  .footer-content { grid-template-columns: 1fr; }
}