/* ============================================
   STB Shared Design System
   ============================================ */

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

/* ---------- Design Tokens ---------- */
:root {
  /* Colors */
  --color-bg-primary: #0a0a1a;
  --color-bg-secondary: #0f0f2a;
  --color-bg-card: rgba(15, 15, 42, 0.6);
  --color-bg-glass: rgba(255, 255, 255, 0.03);
  --color-border-glass: rgba(255, 255, 255, 0.08);

  --color-text-primary: #e8e8f0;
  --color-text-secondary: rgba(232, 232, 240, 0.6);
  --color-text-muted: rgba(232, 232, 240, 0.35);

  --color-accent-cyan: #00f5ff;
  --color-accent-purple: #a855f7;
  --color-accent-blue: #3b82f6;
  --color-accent-pink: #ec4899;

  --gradient-primary: linear-gradient(135deg, #00f5ff, #a855f7);
  --gradient-secondary: linear-gradient(135deg, #3b82f6, #00f5ff);
  --gradient-warm: linear-gradient(135deg, #a855f7, #ec4899);
  --gradient-hero: radial-gradient(ellipse at 20% 50%, rgba(0, 245, 255, 0.08) 0%, transparent 50%),
                   radial-gradient(ellipse at 80% 20%, rgba(168, 85, 247, 0.08) 0%, transparent 50%),
                   radial-gradient(ellipse at 50% 80%, rgba(59, 130, 246, 0.05) 0%, transparent 50%);

  /* Typography */
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 1.875rem;
  --text-4xl: 2.25rem;
  --text-5xl: 3rem;
  --text-6xl: 3.75rem;
  --text-7xl: 4.5rem;

  /* 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;

  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.75rem;
  --radius-lg: 1rem;
  --radius-xl: 1.5rem;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-glow-cyan: 0 0 20px rgba(0, 245, 255, 0.15), 0 0 60px rgba(0, 245, 255, 0.05);
  --shadow-glow-purple: 0 0 20px rgba(168, 85, 247, 0.15), 0 0 60px rgba(168, 85, 247, 0.05);
  --shadow-card: 0 4px 30px rgba(0, 0, 0, 0.3);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 300ms ease;
  --transition-slow: 500ms ease;
  --transition-spring: 500ms cubic-bezier(0.34, 1.56, 0.64, 1);
}

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

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

body {
  font-family: var(--font-primary);
  background-color: var(--color-bg-primary);
  color: var(--color-text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

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

button {
  cursor: pointer;
  border: none;
  background: none;
  font-family: inherit;
  color: inherit;
}

input, textarea {
  font-family: inherit;
  color: inherit;
  border: none;
  outline: none;
  background: none;
}

ul, ol {
  list-style: none;
}

/* ---------- Utility Classes ---------- */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-xl);
}

.gradient-text {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.gradient-text-secondary {
  background: var(--gradient-secondary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.glass-card {
  background: var(--color-bg-glass);
  border: 1px solid var(--color-border-glass);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 0.85rem 2rem;
  background: var(--gradient-primary);
  color: var(--color-bg-primary);
  font-weight: 600;
  font-size: var(--text-sm);
  border-radius: var(--radius-full);
  letter-spacing: 0.02em;
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.btn-primary::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255,255,255,0.2), transparent);
  opacity: 0;
  transition: opacity var(--transition-base);
}

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

.btn-primary:hover::before {
  opacity: 1;
}

.btn-outline {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 0.85rem 2rem;
  background: transparent;
  color: var(--color-accent-cyan);
  font-weight: 500;
  font-size: var(--text-sm);
  border-radius: var(--radius-full);
  border: 1px solid rgba(0, 245, 255, 0.3);
  letter-spacing: 0.02em;
  transition: all var(--transition-base);
}

.btn-outline:hover {
  background: rgba(0, 245, 255, 0.05);
  border-color: var(--color-accent-cyan);
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow-cyan);
}

.section-label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-accent-cyan);
  text-transform: uppercase;
  letter-spacing: 0.2em;
  margin-bottom: var(--space-md);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.section-label::before {
  content: '';
  width: 24px;
  height: 1px;
  background: var(--color-accent-cyan);
}

.section-title {
  font-size: clamp(var(--text-3xl), 4vw, var(--text-5xl));
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--space-lg);
}

.section-desc {
  font-size: var(--text-lg);
  color: var(--color-text-secondary);
  max-width: 600px;
  line-height: 1.7;
}

/* ---------- Particle Canvas ---------- */
.particle-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: auto;
}

/* ---------- Animations ---------- */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes slideInLeft {
  from {
    opacity: 0;
    transform: translateX(-30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes pulse {
  0%, 100% { opacity: 0.5; }
  50% { opacity: 1; }
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

@keyframes glow {
  0%, 100% { box-shadow: 0 0 5px rgba(0, 245, 255, 0.2); }
  50% { box-shadow: 0 0 20px rgba(0, 245, 255, 0.4), 0 0 40px rgba(0, 245, 255, 0.1); }
}

.animate-on-scroll {
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.animate-on-scroll.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- Scrollbar ---------- */
::-webkit-scrollbar {
  width: 6px;
}

::-webkit-scrollbar-track {
  background: var(--color-bg-primary);
}

::-webkit-scrollbar-thumb {
  background: rgba(0, 245, 255, 0.2);
  border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
  background: rgba(0, 245, 255, 0.4);
}

/* ---------- Responsive ---------- */
@media (max-width: 768px) {
  .container {
    padding: 0 var(--space-md);
  }
}