/* === CSS Layers === */
@layer reset, base, layout, components, utilities;

/* === CSS Custom Properties === */
:root {
  /* Colors */
  --color-bg: #000;
  --color-text: #fff;
  --color-link: #fff;
  --color-link-hover: rgba(255, 255, 255, 0.8);
  --color-skip-link-bg: #fff;
  --color-skip-link-text: #000;
  
  /* Spacing */
  --space-sm: 1rem;
  --space-md: 2.5rem;
  --space-lg: 4rem;
  
  /* Typography */
  --font-size-title: clamp(2rem, 6vw, 4rem);
  --font-size-subtitle: clamp(1.25rem, 3vw, 2rem);
  --font-size-contact: clamp(1rem, 2vw, 1.125rem);
  
  /* Transitions */
  --transition-base: 0.2s;
}

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

/* === Base Styles === */
@layer base {
  html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    -webkit-text-size-adjust: 100%;
  }

  /* Enable smooth scrolling only for users who prefer motion */
  @media (prefers-reduced-motion: no-preference) {
    html {
      scroll-behavior: smooth;
    }
  }

  body {
    font-family: Helvetica, "Helvetica Neue", Arial, sans-serif;
    background: var(--color-bg);
    color: var(--color-text);
    color-scheme: dark;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    text-rendering: optimizeLegibility;
    line-height: 1.6;
  }
}

/* === Layout === */
@layer layout {
  main {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100%;
  }

  .container {
    text-align: center;
    color: var(--color-text);
    padding: var(--space-sm);
    width: 100%;
    max-width: 800px;
  }

  /* Tablet and up */
  @media (min-width: 641px) {
    .container {
      padding: var(--space-md);
    }
  }
}

/* === Components === */
@layer components {
  /* Skip Link */
  .skip-link {
    position: absolute;
    top: -3rem;
    left: 0;
    padding: 0.5rem 1rem;
    background: var(--color-skip-link-bg);
    color: var(--color-skip-link-text);
    text-decoration: none;
    z-index: 100;
    transition: top var(--transition-base);
    font-weight: 600;
  }

  .skip-link:focus {
    top: 0;
  }

  .skip-link:focus-visible {
    outline: 2px solid var(--color-skip-link-text);
    outline-offset: 2px;
  }

  /* Typography */
  .main-title {
    font-size: var(--font-size-title);
    margin-bottom: var(--space-sm);
    font-weight: 700;
    letter-spacing: -0.02em;
    line-height: 1.1;
    white-space: nowrap;
  }

  /* Tablet and up */
  @media (min-width: 641px) {
    .main-title {
      margin-bottom: var(--space-md);
    }
  }

  .subtitle {
    font-size: var(--font-size-subtitle);
    margin-bottom: var(--space-sm);
    font-weight: 400;
    opacity: 0.9;
  }

  /* Tablet and up */
  @media (min-width: 641px) {
    .subtitle {
      margin-bottom: var(--space-md);
    }
  }

  /* Contact Text */
  .contact {
    font-size: clamp(0.875rem, 1.5vw, 1rem);
    margin: 0;
    opacity: 0.85;
  }

  .contact a {
    color: var(--color-link);
    text-decoration: underline;
    transition: color var(--transition-base);
  }

  .contact a:hover,
  .contact a:focus {
    color: var(--color-link-hover);
  }

  .contact a:focus-visible {
    outline: 2px solid var(--color-text);
    outline-offset: 4px;
    border-radius: 2px;
  }
}

/* === Utilities & Special Cases === */
@layer utilities {
  /* Reduced Motion */
  @media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
      animation-duration: 0.01ms !important;
      animation-iteration-count: 1 !important;
      transition-duration: 0.01ms !important;
    }
  }

  /* Print Styles */
  @media print {
    body {
      background: white;
      color: black;
      display: block;
    }
    
    .skip-link {
      display: none;
    }
    
    .contact a {
      text-decoration: underline;
    }
    
    .contact a:after {
      content: " (" attr(href) ")";
      font-size: 0.8em;
      font-style: italic;
    }
  }
}