/* 
 * AI Translate Earbuds - Design Tokens
 * Palette: Cold Luxury (silver-grey + chrome + smoke + electric blue)
 * Dials: VARIANCE=8, MOTION=7, DENSITY=4
 */

:root {
  /* Colors - Cold Luxury Palette */
  --color-bg: #f8f9fa;
  --color-bg-alt: #ffffff;
  --color-surface: #ffffff;
  --color-surface-elevated: #ffffff;
  --color-text-primary: #0a0a0a;
  --color-text-secondary: #4a5568;
  --color-text-tertiary: #718096;
  --color-accent: #0066ff;
  --color-accent-hover: #0052cc;
  --color-accent-light: rgba(0, 102, 255, 0.08);
  --color-accent-glow: rgba(0, 102, 255, 0.2);
  --color-border: #e2e8f0;
  --color-border-light: #f0f0f0;
  --color-success: #10b981;
  --color-error: #ef4444;

  /* Typography */
  --font-display: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  /* Font Sizes */
  --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;
  --text-8xl: 6rem;

  /* 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;
  --space-32: 8rem;
  --space-48: 12rem;

  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-2xl: 24px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
  --shadow-glow: 0 0 40px var(--color-accent-glow);

  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 300ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slower: 800ms cubic-bezier(0.4, 0, 0.2, 1);

  /* Layout */
  --max-width: 1400px;
  --nav-height: 72px;
  --section-padding: clamp(var(--space-16), 8vw, var(--space-24));
}

/* Dark mode support */
@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #0a0a0a;
    --color-bg-alt: #111111;
    --color-surface: #1a1a1a;
    --color-surface-elevated: #242424;
    --color-text-primary: #f8f9fa;
    --color-text-secondary: #a0aec0;
    --color-text-tertiary: #718096;
    --color-border: #2d3748;
    --color-border-light: #1a1a1a;
    --color-accent-light: rgba(0, 102, 255, 0.15);
  }
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.6;
  color: var(--color-text-primary);
  background-color: var(--color-bg);
  overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.02em;
}

h1 { font-size: clamp(var(--text-5xl), 8vw, var(--text-8xl)); }
h2 { font-size: clamp(var(--text-4xl), 6vw, var(--text-6xl)); }
h3 { font-size: clamp(var(--text-3xl), 4vw, var(--text-5xl)); }
h4 { font-size: clamp(var(--text-2xl), 3vw, var(--text-4xl)); }

p {
  max-width: 65ch;
  color: var(--color-text-secondary);
}

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

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

/* Utility classes */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

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

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Animation utilities */
.fade-in-up {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}

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

/* Glassmorphism */
.glass {
  background: rgba(255, 255, 255, 0.7);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.3);
}

@media (prefers-color-scheme: dark) {
  .glass {
    background: rgba(26, 26, 26, 0.7);
    border: 1px solid rgba(255, 255, 255, 0.1);
  }
}