/* ========================================
   cccgpt.com — Design System & Styles
   ======================================== */

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

/* ---- CSS Variables (Minimalist Line Art) ---- */
:root {
  /* Colors - Strict Monochrome */
  --bg-primary: #ffffff;
  --bg-secondary: #f8f8f8;
  --bg-card: #ffffff;
  --bg-glass: rgba(255, 255, 255, 1);
  /* Solid for line art */
  --bg-glass-hover: #f0f0f0;

  --text-primary: #000000;
  --text-secondary: #333333;
  --text-muted: #666666;

  /* Accents - Black & Dark Gray */
  --accent-blue: #000000;
  /* Replaced with Black */
  --accent-purple: #000000;
  --accent-cyan: #000000;
  --accent-green: #000000;
  --accent-amber: #000000;

  /* Gradients - REMOVED (Solid Colors) */
  --gradient-main: #000000;
  --gradient-hero: #ffffff;
  --gradient-card: #ffffff;
  --gradient-glow: none;

  --border-color: #000000;
  /* High Contrast Border */
  --border-glow: #000000;

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 6rem;

  /* Radius - Minimal/Sharp */
  --radius-sm: 2px;
  --radius-md: 4px;
  --radius-lg: 8px;
  --radius-xl: 12px;
  --radius-full: 9999px;
  /* Keep pill shapes for buttons if desired, or make rect */

  /* Shadows - Hard/Sketchy */
  --shadow-sm: 2px 2px 0 0 #000000;
  --shadow-md: 4px 4px 0 0 #000000;
  --shadow-lg: 8px 8px 0 0 #000000;
  --shadow-glow: none;

  /* Transitions */
  --transition-fast: 0.1s ease;
  --transition-base: 0.2s ease;
  --transition-slow: 0.3s ease;
}


/* No dark mode — Light only */
body::before {
  display: none;
}


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

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  transition: background 0.4s ease, color 0.4s ease;
}

a {
  text-decoration: none;
  color: inherit;
}

ul,
ol {
  list-style: none;
}

img {
  max-width: 100%;
  display: block;
}

/* ---- Background Ambient Glow ---- */
/* Removed ambient glow for cleaner look */

@keyframes ambientShift {
  0% {
    transform: translate(0, 0) scale(1);
  }

  100% {
    transform: translate(-3%, -3%) scale(1.05);
  }
}

/* ---- Container ---- */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-xl);
  position: relative;
  z-index: 1;
}

/* ---- Section ---- */
.section {
  padding: var(--space-4xl) 0;
}

.section-title {
  font-size: 2.25rem;
  font-weight: 800;
  text-align: center;
  margin-bottom: var(--space-lg);
  background: var(--gradient-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section-subtitle {
  text-align: center;
  color: var(--text-secondary);
  font-size: 1.1rem;
  max-width: 600px;
  margin: 0 auto var(--space-3xl);
}

/* ========================================
   Navigation
   ======================================== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: var(--space-md) 0;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  background: var(--bg-primary);
  border-bottom: 2px solid var(--border-color);
  transition: var(--transition-base);
}

.navbar.scrolled {
  padding: var(--space-sm) 0;
  background: var(--bg-primary);
  box-shadow: var(--shadow-sm);
}

.nav-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-size: 1.5rem;
  font-weight: 800;
  background: var(--gradient-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -0.5px;
}

.nav-logo span {
  -webkit-text-fill-color: var(--text-muted);
  font-weight: 400;
  font-size: 0.85rem;
  margin-left: 0.5rem;
}

.nav-links {
  display: flex;
  gap: var(--space-xl);
  align-items: center;
}

.nav-links a {
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  transition: var(--transition-fast);
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gradient-main);
  transition: var(--transition-base);
  border-radius: 1px;
}

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

.nav-links a:hover::after {
  width: 100%;
}

.nav-cta {
  padding: 0.5rem 1.25rem !important;
  background: var(--gradient-main) !important;
  border-radius: var(--radius-full) !important;
  color: white !important;
  font-weight: 600 !important;
  transition: var(--transition-base) !important;
  box-shadow: 0 4px 15px rgba(59, 130, 246, 0.3);
}

.nav-cta:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(59, 130, 246, 0.4) !important;
}

.nav-cta::after {
  display: none !important;
}

/* Mobile menu toggle */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
}

.nav-toggle span {
  width: 24px;
  height: 2px;
  background: var(--text-secondary);
  border-radius: 2px;
  transition: var(--transition-base);
}

/* Theme Toggle Button */
.theme-toggle {
  background: var(--bg-glass);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  padding: 0.4rem 0.6rem;
  cursor: pointer;
  font-size: 1.1rem;
  line-height: 1;
  transition: var(--transition-base);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-left: var(--space-sm);
}

.theme-toggle:hover {
  background: var(--bg-glass-hover);
  border-color: var(--border-glow);
  transform: rotate(20deg) scale(1.1);
}

/* ========================================
   Hero Section
   ======================================== */
.hero {
  min-height: 90vh;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
  padding-top: 80px;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: transparent;
  z-index: 0;
}

/* Removed hero pulse animation for cleaner look */

.hero-content {
  text-align: center;
  position: relative;
  z-index: 1;
  width: 100%;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 0;
  background: transparent;
  border: none;
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: 500;
  margin-bottom: var(--space-xl);
  animation: fadeInUp 0.6s ease forwards;
}

.hero-badge .dot {
  width: 8px;
  height: 8px;
  background: #22c55e;
  border-radius: 50%;
  box-shadow: 0 0 6px #22c55e;
  animation: dotPulse 2s ease-in-out infinite;
}

@keyframes dotPulse {

  0%,
  100% {
    opacity: 1;
    transform: scale(1);
  }

  50% {
    opacity: 0.5;
    transform: scale(0.8);
  }
}

.hero-title {
  font-size: 4rem;
  font-weight: 900;
  line-height: 1.1;
  margin-bottom: var(--space-lg);
  animation: fadeInUp 0.6s ease 0.1s forwards;
  opacity: 0;
}

.hero-title .gradient-text {
  background: none;
  -webkit-text-fill-color: var(--text-primary);
  color: var(--text-primary);
}

.hero-title .line2 {
  display: block;
  font-size: 2rem;
  font-weight: 600;
  margin-top: 0.25rem;
}

.hero-desc {
  font-size: 1.2rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto var(--space-lg);
  line-height: 1.8;
  animation: fadeInUp 0.6s ease 0.2s forwards;
  opacity: 0;
}

.hero-actions {
  display: flex;
  gap: var(--space-md);
  justify-content: center;
  flex-wrap: wrap;
  animation: fadeInUp 0.6s ease 0.3s forwards;
  opacity: 0;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.875rem 2rem;
  border-radius: var(--radius-full);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: var(--transition-base);
  font-family: inherit;
}

.btn-primary {
  background: var(--text-primary);
  color: var(--bg-primary);
  border: 2px solid var(--text-primary);
  box-shadow: 4px 4px 0 0 var(--border-color);
}

.btn-primary:hover {
  transform: translate(-2px, -2px);
  box-shadow: 6px 6px 0 0 var(--border-color);
}

.btn-secondary {
  background: transparent;
  color: var(--text-primary);
  border: 2px solid var(--border-color);
  backdrop-filter: none;
}

.btn-secondary:hover {
  background: var(--bg-secondary);
  border-color: var(--text-primary);
  transform: translate(-2px, -2px);
  box-shadow: 4px 4px 0 0 var(--text-primary);
}

/* Hero stats */
.hero-stats {
  display: flex;
  justify-content: center;
  gap: var(--space-3xl);
  margin-top: var(--space-3xl);
  animation: fadeInUp 0.6s ease 0.4s forwards;
  opacity: 0;
}

.stat-item {
  text-align: center;
}

.stat-number {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -1px;
}

.stat-label {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: var(--space-xs);
}

/* ========================================
   Features Section
   ======================================== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-xl);
}

.feature-card {
  background: var(--bg-primary);
  border: 2px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--space-2xl);
  transition: var(--transition-base);
  position: relative;
  box-shadow: 4px 4px 0 0 var(--border-color);
}

/* Removed feature-card::before */

.feature-icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: var(--space-lg);
  background: var(--gradient-card);
  border: 1px solid var(--border-color);
}

.feature-card:nth-child(1) .feature-icon {
  background: rgba(59, 130, 246, 0.15);
}

.feature-card:nth-child(2) .feature-icon {
  background: rgba(139, 92, 246, 0.15);
}

.feature-card:nth-child(3) .feature-icon {
  background: rgba(16, 185, 129, 0.15);
}

.feature-card:nth-child(4) .feature-icon {
  background: rgba(6, 182, 212, 0.15);
}

.feature-title {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: var(--space-sm);
}

.feature-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ========================================
   CCC Domain Breakdown (inside Hero)
   ======================================== */
.hero-ccc {
  display: inline-flex;
  align-items: center;
  gap: var(--space-md);
  padding: 0.65rem 0;
  background: transparent;
  border: none;
  margin-top: var(--space-md);
  margin-bottom: var(--space-md);
  flex-wrap: wrap;
  justify-content: center;
}

.ccc-domain {
  font-size: 1.35rem;
  font-weight: 800;
  font-family: 'Inter', monospace;
  background: none;
  -webkit-text-fill-color: var(--text-primary);
  color: var(--text-primary);
  letter-spacing: -0.3px;
}

.ccc-domain-dim {
  opacity: 0.45;
  background: none;
  -webkit-text-fill-color: var(--text-muted);
}

.ccc-eq {
  color: var(--text-muted);
  font-size: 1rem;
  font-weight: 300;
  opacity: 0.6;
}

.ccc-word {
  font-size: 1.1rem;
  font-weight: 500;
  color: var(--text-secondary);
  letter-spacing: 0.2px;
}

.ccc-word em {
  font-style: normal;
  font-weight: 800;
  background: none;
  -webkit-text-fill-color: var(--text-primary);
  color: var(--text-primary);
}

.ccc-dot {
  color: var(--text-muted);
  font-size: 0.85rem;
  opacity: 0.4;
}

/* ========================================
   Comparison Table
   ======================================== */
.comparison-wrapper {
  overflow-x: auto;
  border-radius: var(--radius-lg);
  border: 2px solid var(--border-color);
  background: var(--bg-primary);
  box-shadow: 4px 4px 0 0 var(--border-color);
}

.comparison-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 700px;
}

.comparison-table thead {
  background: var(--bg-secondary);
  border-bottom: 2px solid var(--border-color);
}

.comparison-table th {
  padding: var(--space-lg) var(--space-xl);
  font-size: 0.95rem;
  font-weight: 700;
  text-align: center;
  border-bottom: 1px solid var(--border-color);
  white-space: nowrap;
}

.comparison-table th:first-child {
  text-align: left;
  width: 120px;
}

/* Highlight cccgpt column header */
/* Highlight cccgpt column header */
.comparison-table th.highlight {
  background: var(--bg-primary);
  color: var(--text-primary);
  position: relative;
  border-left: 2px solid var(--border-color);
  border-right: 2px solid var(--border-color);
}

.comparison-table th.highlight::before {
  content: '★ 推荐';
  position: absolute;
  top: -1px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--text-primary);
  color: var(--bg-primary);
  font-size: 0.75rem;
  padding: 4px 12px;
  border-radius: 0 0 var(--radius-sm) var(--radius-sm);
  font-weight: 600;
}

/* De-emphasize reference-only column */
.comparison-table th.ref-only {
  opacity: 0.55;
}

/* Buy buttons in comparison table */
.cta-row td {
  border-bottom: none;
  padding-top: var(--space-lg);
  padding-bottom: var(--space-lg);
}

.table-buy-btn {
  display: inline-block;
  padding: 0.55rem 1.6rem;
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 600;
  text-decoration: none;
  transition: var(--transition-fast);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  background: var(--bg-glass);
}

.table-buy-btn:hover {
  border-color: var(--accent-blue);
  color: var(--accent-blue);
  transform: translateY(-1px);
}

.table-buy-btn.primary {
  background: var(--gradient-main);
  color: white;
  border: none;
}

.table-buy-btn.primary:hover {
  opacity: 0.9;
  transform: translateY(-1px);
  box-shadow: 0 4px 15px rgba(99, 102, 241, 0.4);
}

.comparison-table td {
  padding: var(--space-md) var(--space-xl);
  text-align: center;
  border-bottom: 1px solid var(--border-color);
  font-size: 0.92rem;
  color: var(--text-secondary);
  transition: var(--transition-fast);
}

.comparison-table td:first-child {
  text-align: left;
  font-weight: 600;
  color: var(--text-primary);
  white-space: nowrap;
}

/* Highlight cccgpt column */
.comparison-table td.highlight {
  color: var(--text-primary);
  background: rgba(59, 130, 246, 0.05);
  font-weight: 600;
}

/* Team & cccgpt columns — bold + highlight */
.comparison-table td:nth-child(3),
.comparison-table td:nth-child(4) {
  font-weight: 600;
  color: var(--text-primary);
  background: rgba(0, 0, 0, 0.03);
}

.comparison-table tbody tr {
  transition: var(--transition-fast);
}

.comparison-table tbody tr:hover {
  background: rgba(255, 255, 255, 0.02);
}

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

/* Advantage tags */
.advantage {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  color: var(--accent-green);
  font-weight: 700;
}

.advantage::before {
  content: '✓';
  font-size: 0.8rem;
}

/* Neutral / disadvantage */
.neutral {
  color: var(--text-muted);
}

.warning {
  color: var(--accent-amber);
}

/* Price styling */
.price-tag {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--text-primary);
  background: none;
  -webkit-text-fill-color: var(--text-primary);
}

.price-tag .unit {
  font-size: 0.85rem;
  font-weight: 500;
  -webkit-text-fill-color: var(--text-secondary);
}

.price-original {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* ========================================
   FAQ Section
   ======================================== */
.faq-list {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.faq-item {
  background: var(--bg-glass);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: var(--transition-base);
}

.faq-item:hover {
  border-color: var(--border-glow);
}

.faq-item.active {
  border-color: rgba(59, 130, 246, 0.3);
  box-shadow: 0 0 20px rgba(59, 130, 246, 0.08);
}

.faq-question {
  padding: var(--space-lg) var(--space-xl);
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  font-weight: 600;
  font-size: 0.95rem;
  gap: var(--space-md);
  transition: var(--transition-fast);
  user-select: none;
}

.faq-question:hover {
  color: var(--accent-blue);
}

.faq-icon {
  font-size: 1.25rem;
  transition: var(--transition-base);
  color: var(--text-muted);
  flex-shrink: 0;
}

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

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, padding 0.3s ease;
}

.faq-answer-inner {
  padding: 0 var(--space-xl) var(--space-lg);
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.8;
}

.faq-item.active .faq-answer {
  max-height: 300px;
}

/* ========================================
   Contact / CTA Section
   ======================================== */
.cta-section {
  text-align: center;
  position: relative;
}

.cta-card {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: var(--space-4xl) var(--space-3xl);
  position: relative;
  overflow: hidden;
}

.cta-card::before {
  display: none;
}

.cta-title {
  font-size: 2rem;
  font-weight: 800;
  margin-bottom: var(--space-md);
}

.cta-desc {
  color: var(--text-secondary);
  font-size: 1.05rem;
  margin-bottom: var(--space-2xl);
  max-width: 500px;
  margin-left: auto;
  margin-right: auto;
}

.contact-methods {
  display: flex;
  justify-content: center;
  gap: var(--space-xl);
  flex-wrap: wrap;
}

.contact-item {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 0.75rem 1.5rem;
  background: var(--bg-glass);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  font-size: 0.9rem;
  color: var(--text-secondary);
  transition: var(--transition-base);
}

.contact-item:hover {
  border-color: var(--border-glow);
  color: var(--text-primary);
  background: var(--bg-glass-hover);
}

.contact-item .icon {
  font-size: 1.2rem;
}

/* ========================================
   Contact Modal
   ======================================== */
.modal-overlay {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 9999;
  background: rgba(0, 0, 0, 0.35);
  backdrop-filter: blur(4px);
  justify-content: center;
  align-items: center;
}

.modal-overlay.open {
  display: flex;
}

.modal-card {
  background: #ffffff;
  border-radius: 20px;
  padding: 2.5rem 2rem 2rem;
  width: 92%;
  max-width: 420px;
  position: relative;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.12);
  animation: modalIn 0.25s ease;
}

@keyframes modalIn {
  from {
    opacity: 0;
    transform: scale(0.92) translateY(12px);
  }

  to {
    opacity: 1;
    transform: scale(1) translateY(0);
  }
}

.modal-close {
  position: absolute;
  top: 1rem;
  right: 1.2rem;
  background: none;
  border: 1px solid var(--border-color);
  border-radius: 50%;
  width: 32px;
  height: 32px;
  font-size: 1.2rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  transition: var(--transition-fast);
}

.modal-close:hover {
  background: var(--bg-secondary);
  color: var(--text-primary);
}

.modal-title {
  font-size: 1.5rem;
  font-weight: 800;
  margin-bottom: 1.5rem;
  color: var(--text-primary);
}

.modal-field {
  background: var(--bg-secondary);
  border: 1px solid #e0e0e0;
  border-radius: 12px;
  padding: 1rem 1.2rem;
  margin-bottom: 0.75rem;
}

.modal-label {
  display: block;
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}

.modal-value-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-value {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.3px;
}

.modal-copy-btn {
  background: var(--text-primary);
  color: var(--bg-primary);
  border: none;
  border-radius: 8px;
  padding: 0.45rem 1rem;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition-fast);
}

.modal-copy-btn:hover {
  opacity: 0.85;
}

.modal-copy-btn.copied {
  background: #22c55e;
}

.modal-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 1.1rem;
  font-weight: 600;
  color: #10b981;
  text-decoration: none;
  transition: var(--transition-fast);
}

.modal-link:hover {
  color: #059669;
}

.modal-link span {
  font-size: 1.4rem;
  margin-left: 0.5rem;
}

.modal-hint {
  text-align: center;
  color: var(--text-muted);
  font-size: 0.82rem;
  margin-top: 1rem;
  padding: 0.75rem;
  background: var(--bg-secondary);
  border-radius: 8px;
}

/* ========================================
   Footer
   ======================================== */
.footer {
  padding: var(--space-2xl) 0;
  text-align: center;
}

.footer-text {
  color: var(--text-muted);
  font-size: 0.85rem;
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: var(--space-xl);
  margin-top: var(--space-md);
}

.footer-links a {
  color: var(--text-muted);
  font-size: 0.85rem;
  transition: var(--transition-fast);
}

.footer-links a:hover {
  color: var(--accent-blue);
}

/* ========================================
   Animations
   ======================================== */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Stagger children */
.stagger>* {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.stagger.visible>*:nth-child(1) {
  transition-delay: 0s;
}

.stagger.visible>*:nth-child(2) {
  transition-delay: 0.1s;
}

.stagger.visible>*:nth-child(3) {
  transition-delay: 0.2s;
}

.stagger.visible>*:nth-child(4) {
  transition-delay: 0.3s;
}

.stagger.visible>* {
  opacity: 1;
  transform: translateY(0);
}

/* ========================================
   Responsive
   ======================================== */

/* Tablet */
@media (max-width: 1024px) {
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* Mobile */
@media (max-width: 768px) {
  html {
    font-size: 15px;
  }

  .container {
    padding: 0 var(--space-lg);
  }

  .section {
    padding: var(--space-3xl) 0;
  }

  /* CCC brand line — fit on one line */
  .hero-ccc {
    gap: var(--space-xs);
    flex-wrap: nowrap;
  }

  .ccc-domain {
    font-size: 0.95rem;
  }

  .ccc-eq {
    font-size: 0.75rem;
  }

  .ccc-word {
    font-size: 0.8rem;
    white-space: nowrap;
  }

  .ccc-dot {
    font-size: 0.6rem;
  }

  /* Nav */
  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    background: var(--bg-primary);
    backdrop-filter: blur(20px);
    padding: var(--space-xl);
    gap: var(--space-lg);
    border-bottom: 1px solid var(--border-color);
  }

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

  .theme-toggle {
    position: absolute;
    right: 56px;
    top: 50%;
    transform: translateY(-50%);
    margin-left: 0;
  }

  .nav-toggle {
    display: flex;
  }

  /* Hero */
  .hero-title {
    font-size: 2.5rem;
  }

  .hero-title .line2 {
    font-size: 2rem;
  }

  .hero-desc {
    font-size: 1rem;
  }

  .hero-stats {
    gap: var(--space-xl);
  }

  .stat-number {
    font-size: 1.5rem;
  }

  /* Features */
  .features-grid {
    grid-template-columns: 1fr;
  }

  .section-title {
    font-size: 1.75rem;
  }

  /* CTA */
  .cta-card {
    padding: var(--space-3xl) var(--space-xl);
  }

  .cta-title {
    font-size: 1.5rem;
  }

  .contact-methods {
    flex-direction: column;
    align-items: center;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 2rem;
  }

  .hero-title .line2 {
    font-size: 1.6rem;
  }

  .hero-stats {
    flex-direction: column;
    gap: var(--space-lg);
  }
}