/* Modern CSS Reset and Variables */
@layer base {
  :root {
    /* Light Theme (Default) */
    --bg-color: oklch(0.98 0.01 250);
    --text-color: oklch(0.25 0.02 250);
    --primary-color: oklch(0.65 0.25 260);
    --primary-glow: oklch(0.65 0.25 260 / 0.5);
    --surface-color: oklch(1 0 0);
    --border-color: oklch(0.9 0 0);
    --muted-text: oklch(0.5 0.02 250);
    
    --shadow-sm: 0 2px 4px oklch(0 0 0 / 0.05);
    --shadow-md: 0 10px 15px -3px oklch(0 0 0 / 0.1), 0 4px 6px -2px oklch(0 0 0 / 0.05);
    --shadow-lg: 0 20px 25px -5px oklch(0 0 0 / 0.1), 0 10px 10px -5px oklch(0 0 0 / 0.04);
    --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
  }

  [data-theme="dark"] {
    --bg-color: oklch(0.15 0.02 250);
    --text-color: oklch(0.95 0.01 250);
    --primary-color: oklch(0.7 0.2 250);
    --primary-glow: oklch(0.7 0.2 250 / 0.4);
    --surface-color: oklch(0.2 0.02 250);
    --border-color: oklch(0.3 0.02 250);
    --muted-text: oklch(0.7 0.02 250);
    
    --shadow-sm: 0 2px 4px oklch(0 0 0 / 0.2);
    --shadow-md: 0 10px 15px -3px oklch(0 0 0 / 0.3);
    --shadow-lg: 0 20px 25px -5px oklch(0 0 0 / 0.4);
  }

  * {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
  }

  body {
    font-family: var(--font-sans);
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.5;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    position: relative;
    overflow-x: hidden;
  }

  /* Noise Texture Overlay */
  body::before {
    content: "";
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0.03;
    z-index: 1000;
    pointer-events: none;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3%3Ffilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.65' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)'/%3E%3C/svg%3E");
  }
}

@layer components {
  header {
    margin: 4rem 0 2rem;
    text-align: center;
  }

  h1 {
    font-size: 3rem;
    font-weight: 800;
    letter-spacing: -0.05em;
    background: linear-gradient(135deg, var(--primary-color), oklch(0.5 0.2 300));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 0.5rem;
  }

  p.subtitle {
    font-size: 1.125rem;
    color: var(--muted-text);
  }

  main {
    width: 100%;
    max-width: 800px;
    padding: 0 1.5rem;
  }
}

/* Animations */
@keyframes popIn {
  0% { transform: scale(0); opacity: 0; }
  70% { transform: scale(1.1); }
  100% { transform: scale(1); opacity: 1; }
}

@keyframes glow {
  0%, 100% { box-shadow: 0 0 5px var(--primary-glow); }
  50% { box-shadow: 0 0 20px var(--primary-glow); }
}