/* CSS Variables - Design System 2025 */
:root {
  /* Colors */
  --primary-50: #f0f9ff;
  --primary-100: #e0f2fe;
  --primary-500: #0ea5e9;
  --primary-600: #0284c7;
  --primary-700: #0369a1;
  --primary-900: #0c4a6e;
  
  --accent-400: #a855f7;
  --accent-500: #9333ea;
  --accent-600: #7c3aed;
  
  --neutral-50: #fafafa;
  --neutral-100: #f5f5f5;
  --neutral-200: #e5e5e5;
  --neutral-300: #d4d4d4;
  --neutral-400: #a3a3a3;
  --neutral-500: #737373;
  --neutral-600: #525252;
  --neutral-700: #404040;
  --neutral-800: #262626;
  --neutral-900: #171717;
  
  --success-500: #10b981;
  --warning-500: #f59e0b;
  --error-500: #ef4444;
  
  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 1.875rem;
  --font-size-4xl: 2.25rem;
  --font-size-5xl: 3rem;
  --font-size-6xl: 3.75rem;
  
  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
  --shadow-2xl: 0 25px 50px -12px rgb(0 0 0 / 0.25);
  
  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  
  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 300ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--neutral-800);
  background: var(--neutral-50);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 var(--space-6);
}

/* Navigation */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--neutral-200);
  transition: all var(--transition-normal);
}

.nav.scrolled {
  background: rgba(255, 255, 255, 0.95);
  box-shadow: var(--shadow-sm);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 80px;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.logo {
  height: 60px;
  width: auto;
}

.nav-links {
  display: flex;
  gap: var(--space-8);
}

.nav-link {
  color: var(--neutral-600);
  text-decoration: none;
  font-weight: 500;
  font-size: var(--font-size-sm);
  transition: color var(--transition-fast);
  position: relative;
}

.nav-link:hover {
  color: var(--primary-600);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--primary-600);
  transition: width var(--transition-fast);
}

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

/* Active nav link */
.nav-link.active {
  color: var(--primary-600);
}
.nav-link.active::after {
  width: 100%;
}

/* Hamburger toggle (hidden on desktop) */
.nav-toggle {
  display: none;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: var(--space-2);
  border-radius: var(--radius-md);
}

.nav-toggle .bar {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--neutral-700);
  margin: 5px 0;
  transition: all var(--transition-fast);
}

/* Buttons */
.btn-primary {
  background: linear-gradient(135deg, var(--primary-600), var(--accent-500));
  color: white;
  border: none;
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-lg);
  font-weight: 600;
  font-size: var(--font-size-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  box-shadow: var(--shadow-md);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.btn-large {
  padding: var(--space-4) var(--space-8);
  font-size: var(--font-size-base);
}

.btn-secondary {
  background: transparent;
  color: var(--neutral-700);
  border: 2px solid var(--neutral-300);
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-lg);
  font-weight: 600;
  font-size: var(--font-size-sm);
  text-decoration: none;
  cursor: pointer;
  transition: all var(--transition-fast);
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
}

.btn-secondary:hover {
  border-color: var(--primary-600);
  color: var(--primary-600);
  transform: translateY(-2px);
}

.btn-icon {
  width: 20px;
  height: 20px;
}

/* Hero Section */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
  padding-top: 80px;
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: -1;
}

.hero-grid {
  position: absolute;
  inset: 0;
  background-image: 
    linear-gradient(var(--neutral-200) 1px, transparent 1px),
    linear-gradient(90deg, var(--neutral-200) 1px, transparent 1px);
  background-size: 50px 50px;
  opacity: 0.3;
}

.hero-gradient {
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at center, transparent 0%, var(--neutral-50) 70%);
}

.hero-content {
  display: grid;
  grid-template-columns: 1fr;
  align-items: center;
  padding: var(--space-20) 0;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  background: var(--primary-50);
  color: var(--primary-700);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-2xl);
  font-size: var(--font-size-sm);
  font-weight: 600;
  margin-bottom: var(--space-6);
  border: 1px solid var(--primary-200);
}

.hero-title {
  font-size: var(--font-size-6xl);
  font-weight: 800;
  line-height: 1.1;
  color: var(--neutral-900);
  margin-bottom: var(--space-6);
}

.gradient-text {
  background: linear-gradient(135deg, var(--primary-600), var(--accent-500));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: var(--font-size-xl);
  color: var(--neutral-600);
  margin-bottom: var(--space-8);
  line-height: 1.6;
}

.hero-stats {
  display: flex;
  align-items: center;
  gap: var(--space-6);
  margin-bottom: var(--space-10);
}

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

.stat-number {
  font-size: var(--font-size-2xl);
  font-weight: 800;
  color: var(--primary-600);
  line-height: 1;
}

.stat-label {
  font-size: var(--font-size-sm);
  color: var(--neutral-500);
  margin-top: var(--space-1);
}

.stat-divider {
  width: 1px;
  height: 40px;
  background: var(--neutral-300);
}

.hero-cta {
  display: flex;
  gap: var(--space-4);
  align-items: center;
}

/* GPU Card Visual */
.hero-visual {
  display: flex;
  justify-content: center;
  align-items: center;
}

.gpu-card {
  background: linear-gradient(145deg, var(--neutral-100), white);
  border: 1px solid var(--neutral-200);
  border-radius: var(--radius-2xl);
  padding: var(--space-8);
  box-shadow: var(--shadow-2xl);
  width: 100%;
  max-width: 350px;
  position: relative;
  overflow: hidden;
}

.gpu-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--primary-600), var(--accent-500));
}

.gpu-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-6);
}

.gpu-brand {
  font-size: var(--font-size-sm);
  font-weight: 700;
  color: var(--success-500);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.gpu-model {
  font-size: var(--font-size-3xl);
  font-weight: 900;
  color: var(--neutral-900);
}

.gpu-specs {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-4);
  margin-bottom: var(--space-6);
}

.spec-item {
  text-align: center;
  padding: var(--space-3);
  background: var(--neutral-50);
  border-radius: var(--radius-lg);
  border: 1px solid var(--neutral-200);
}

.spec-value {
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: var(--neutral-900);
  line-height: 1;
}

.spec-label {
  font-size: var(--font-size-xs);
  color: var(--neutral-500);
  margin-top: var(--space-1);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.gpu-performance {
  margin-top: var(--space-6);
}

.performance-bar {
  height: 8px;
  background: var(--neutral-200);
  border-radius: var(--radius-sm);
  overflow: hidden;
  margin-bottom: var(--space-3);
}

.performance-fill {
  height: 100%;
  width: 85%;
  background: linear-gradient(90deg, var(--primary-600), var(--accent-500));
  border-radius: var(--radius-sm);
  animation: fillBar 2s ease-out;
}

@keyframes fillBar {
  from { width: 0; }
  to { width: 85%; }
}

.performance-text {
  font-size: var(--font-size-sm);
  color: var(--neutral-600);
  text-align: center;
  font-weight: 600;
}

/* Advantages Section */
.advantages {
  padding: var(--space-24) 0;
  background: white;
}

.section-header {
  text-align: center;
  margin-bottom: var(--space-16);
}

.section-title {
  font-size: var(--font-size-5xl);
  font-weight: 800;
  color: var(--neutral-900);
  margin-bottom: var(--space-4);
  line-height: 1.2;
}

.section-subtitle {
  font-size: var(--font-size-xl);
  color: var(--neutral-600);
  max-width: 600px;
  margin: 0 auto;
}

.advantages-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: var(--space-8);
}

.advantage-card {
  background: white;
  border: 1px solid var(--neutral-200);
  border-radius: var(--radius-2xl);
  padding: var(--space-8);
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.advantage-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--primary-600), transparent);
  transform: translateX(-100%);
  transition: transform var(--transition-slow);
}

.advantage-card:hover::before {
  transform: translateX(100%);
}

.advantage-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl);
  border-color: var(--primary-200);
}

.advantage-icon {
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, var(--primary-100), var(--accent-100));
  border-radius: var(--radius-xl);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-6);
  color: var(--primary-600);
}

.advantage-icon svg {
  width: 24px;
  height: 24px;
}

.advantage-title {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--neutral-900);
  margin-bottom: var(--space-3);
}

.advantage-description {
  color: var(--neutral-600);
  margin-bottom: var(--space-6);
  line-height: 1.6;
}

.advantage-metric {
  display: flex;
  align-items: baseline;
  gap: var(--space-2);
}

.metric-value {
  font-size: var(--font-size-2xl);
  font-weight: 800;
  color: var(--primary-600);
}

.metric-label {
  font-size: var(--font-size-sm);
  color: var(--neutral-500);
}

/* Partner Logos Strip */
.partner-logos {
  background: white;
  border-top: 1px solid var(--neutral-200);
  border-bottom: 1px solid var(--neutral-200);
}

.logos-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: var(--space-8);
  align-items: center;
  padding: var(--space-10) 0;
  opacity: 0.9;
}

.logo-item {
  height: 60px;
  width: auto;
  filter: grayscale(100%);
  opacity: 0.7;
}

/* Mini Process Timeline */
.process-mini {
  margin-top: var(--space-12);
  margin-bottom: var(--space-6);
}

.process-steps {
  display: flex;
  gap: var(--space-4);
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
}

.process-step {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  background: var(--neutral-100);
  border: 1px solid var(--neutral-200);
  border-radius: var(--radius-2xl);
  font-weight: 600;
  color: var(--neutral-700);
}

.process-icon { font-size: 16px; }
.process-text { font-size: var(--font-size-sm); }
.process-sep { color: var(--neutral-400); }

/* Audience Chips */
.audience-chips {
  margin-top: var(--space-6);
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
  justify-content: center;
}

.chip {
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-2xl);
  background: var(--primary-50);
  color: var(--primary-700);
  border: 1px solid var(--primary-100);
  font-weight: 600;
  font-size: var(--font-size-sm);
}

/* Trust Strip */
.trust-strip {
  background: white;
  border-top: 1px solid var(--neutral-200);
  border-bottom: 1px solid var(--neutral-200);
}

.trust-row {
  display: flex;
  gap: var(--space-4);
  align-items: center;
  justify-content: center;
  padding: var(--space-6) 0;
  color: var(--neutral-700);
}

.trust-item { font-weight: 600; }
.trust-dot { color: var(--neutral-400); }
.trust-link {
  margin-left: var(--space-6);
  color: var(--primary-600);
  text-decoration: none;
  font-weight: 700;
}

/* Timeline 2025 */
.timeline-2025 {
  margin-top: var(--space-12);
}

.timeline-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-6);
  position: relative;
}

/* connecting line */
.timeline-steps::before {
  content: '';
  position: absolute;
  top: 28px;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--primary-100), var(--accent-400));
  opacity: 0.6;
}

.t-step {
  position: relative;
  display: flex;
  align-items: flex-start;
  gap: var(--space-4);
}

.t-badge {
  flex: 0 0 auto;
  width: 40px;
  height: 40px;
  display: grid;
  place-items: center;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--primary-600), var(--accent-500));
  color: #fff;
  font-weight: 800;
  box-shadow: var(--shadow-md);
  z-index: 1;
}

.t-content {
  background: #fff;
  border: 1px solid var(--neutral-200);
  border-radius: var(--radius-xl);
  padding: var(--space-4) var(--space-5);
  box-shadow: var(--shadow-sm);
  transform: translateY(-6px);
}

.t-title {
  font-size: var(--font-size-lg);
  font-weight: 800;
  color: var(--neutral-900);
  margin-bottom: var(--space-1);
}

.t-text {
  font-size: var(--font-size-sm);
  color: var(--neutral-600);
}

/* Responsive Design */
@media (max-width: 1024px) {
  .hero-content {
    grid-template-columns: 1fr;
    gap: var(--space-12);
    text-align: center;
  }
  
  .hero-title {
    font-size: var(--font-size-5xl);
  }
  
  .advantages-grid {
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-6);
  }
}

@media (max-width: 768px) {
  .nav-container {
    padding: 0 var(--space-4);
  }
  
  .nav-links {
    display: none;
    position: absolute;
    top: 80px;
    left: 0;
    right: 0;
    background: white;
    border-bottom: 1px solid var(--neutral-200);
    flex-direction: column;
    gap: var(--space-4);
    padding: var(--space-6);
  }
  .nav-links.open { display: flex; }
  .nav-toggle { display: inline-block; }
  
  .container {
    padding: 0 var(--space-4);
  }
  
  .hero-title {
    font-size: var(--font-size-4xl);
  }
  
  .hero-subtitle {
    font-size: var(--font-size-lg);
  }
  
  .hero-stats {
    flex-direction: column;
    gap: var(--space-4);
  }
  
  .stat-divider {
    display: none;
  }
  
  .hero-cta {
    flex-direction: column;
    width: 100%;
  }
  
  .btn-primary,
  .btn-secondary {
    width: 100%;
    justify-content: center;
  }
  
  .section-title {
    font-size: var(--font-size-4xl);
  }
  
  .advantages-grid {
    grid-template-columns: 1fr;
  }

  /* Timeline 2025: vertical on mobile */
  .timeline-steps {
    grid-template-columns: 1fr;
    gap: var(--space-8);
  }
  .timeline-steps::before {
    display: none;
  }
  .t-step {
    padding-left: 56px;
    align-items: center;
    min-height: 48px;
  }
  .t-step::before {
    content: '';
    position: absolute;
    left: 20px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(180deg, var(--primary-100), var(--accent-400));
    opacity: 0.6;
  }
  .t-badge {
    position: absolute;
    left: 0;
    top: 0;
  }
  .t-content {
    transform: none;
  }
}

/* Modal (Contact) */
.modal {
  position: fixed;
  inset: 0;
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 10000;
}

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

.modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,0.45);
  backdrop-filter: blur(4px);
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.modal.is-open .modal-backdrop { opacity: 1; }

.modal-dialog {
  position: relative;
  width: min(560px, 92vw);
  background: #fff;
  border: 1px solid var(--neutral-200);
  border-radius: var(--radius-2xl);
  box-shadow: var(--shadow-2xl);
  padding: var(--space-8);
  z-index: 1;
  transform: translateY(20px) scale(0.98);
  opacity: 0;
  transition: transform var(--transition-normal), opacity var(--transition-normal);
}

.modal.is-open .modal-dialog {
  transform: translateY(0) scale(1);
  opacity: 1;
}

.modal-close {
  position: absolute;
  top: 12px;
  right: 12px;
  width: 36px;
  height: 36px;
  border: none;
  border-radius: 999px;
  background: var(--neutral-100);
  color: var(--neutral-700);
  font-size: 20px;
  cursor: pointer;
}

.modal-title {
  font-size: var(--font-size-3xl);
  font-weight: 800;
  color: var(--neutral-900);
  margin-bottom: var(--space-2);
}

.modal-subtitle {
  color: var(--neutral-600);
  margin-bottom: var(--space-6);
}

.modal-form { display: grid; gap: var(--space-4); }

.modal-form-group { display: grid; gap: var(--space-2); }

.modal-form-group label {
  font-weight: 600;
  color: var(--neutral-700);
}

.modal-form-group input,
.modal-form-group textarea {
  width: 100%;
  padding: var(--space-4);
  border: 1px solid var(--neutral-200);
  border-radius: var(--radius-lg);
  background: #fff;
  color: var(--neutral-900);
  transition: box-shadow var(--transition-fast), border-color var(--transition-fast);
  font-family: var(--font-family);
  font-size: var(--font-size-base);
}

.modal-form-group textarea { resize: vertical; }

.modal-form-group input:focus,
.modal-form-group textarea:focus {
  outline: none;
  border-color: var(--primary-600);
  box-shadow: 0 0 0 3px rgba(2, 132, 199, 0.15);
}

body.modal-open { overflow: hidden; }

/* Footer */
.site-footer {
  background: var(--neutral-950, #0b0b0f);
  color: var(--neutral-200, #e5e7eb);
  padding: 64px 0 32px;
  margin-top: 0;
}

.site-footer .container { max-width: var(--container-max, 1200px); }

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 32px;
  align-items: start;
}

.footer-logo {
  font-weight: 900;
  font-size: 22px;
  letter-spacing: 0.4px;
  margin-bottom: 8px;
}

.footer-tagline { color: var(--neutral-400, #9ca3af); margin-bottom: 16px; }

.footer-contacts { display: flex; gap: 16px; flex-wrap: wrap; }

.footer-nav h4,
.footer-services h4,
.footer-legal h4 { margin: 0 0 12px; font-size: 14px; color: var(--neutral-300); letter-spacing: .02em; }

.footer-link, .footer-services span, .footer-legal p { display: block; color: var(--neutral-300); font-size: 14px; margin: 6px 0; text-decoration: none; }

.footer-link:hover { color: #fff; text-decoration: underline; }

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-top: 1px solid rgba(255,255,255,0.08);
  margin-top: 32px;
  padding-top: 16px;
  color: var(--neutral-400);
}

.footer-made { opacity: 0.8; }

@media (max-width: 900px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 560px) {
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; gap: 8px; }
}

/* Ensure CTA section sits flush with footer */
.final-cta { margin-bottom: 0; }