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

@tailwind base;
@tailwind components;
@tailwind utilities;

@layer base {

  /* Root variables */
  :root {
    --font-sans: 'Space Grotesk', 'SF Pro Display', system-ui, -apple-system, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
  }

  /* Base styles - Using 100% honors browser/OS text size settings */
  html {
    font-size: 100%;
    /* Respects user's browser settings (typically 16px default) */
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    scroll-behavior: smooth;
    /* Allow up to 200% zoom without horizontal scroll */
    overflow-x: hidden;
  }

  /* Scale up base font for users with larger text preferences */
  @media screen and (min-resolution: 1dppx) {
    html {
      /* Uses browser's default, which respects system accessibility settings */
      font-size: clamp(100%, 1vw + 0.75rem, 125%);
    }
  }

  /* High contrast mode support */
  @media (prefers-contrast: high) {
    :root {
      --contrast-multiplier: 1.25;
    }
  }

  /* Forced colors (Windows High Contrast) */
  @media (forced-colors: active) {
    * {
      border-color: currentColor !important;
    }
  }

  body {
    @apply bg-slate-50 dark:bg-slate-900 text-slate-900 dark:text-slate-50;
    font-family: var(--font-sans);
    font-feature-settings: 'ss01' 1, 'ss02' 1;
    letter-spacing: -0.011em;
    transition: background-color 0.3s ease, color 0.3s ease;
  }

  /* Code */
  code,
  pre,
  kbd,
  samp {
    font-family: var(--font-mono);
  }

  /* Touch targets */
  button,
  input,
  select,
  textarea,
  a {
    min-height: 44px;
    min-width: 44px;
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
  }

  /* Focus */
  *:focus-visible {
    @apply outline-none ring-2 ring-emerald-500 ring-offset-2;
    transition: box-shadow 0.2s ease;
  }

  /* Skip link */
  .skip-to-main {
    @apply absolute left-0 top-0 -translate-y-full bg-emerald-600 text-white px-4 py-2 rounded-br-lg font-medium;
    @apply focus:translate-y-0 z-50;
    transition: transform 0.2s ease;
  }

  /* Reduced motion */
  @media (prefers-reduced-motion: reduce) {

    *,
    *::before,
    *::after {
      animation-duration: 0.01ms !important;
      transition-duration: 0.01ms !important;
      scroll-behavior: auto !important;
    }
  }

  /* Headings */
  h1,
  h2,
  h3,
  h4,
  h5,
  h6 {
    @apply font-bold tracking-tight;
    letter-spacing: -0.025em;
  }

  h1 {
    @apply text-4xl md:text-5xl;
  }

  h2 {
    @apply text-3xl md:text-4xl;
  }

  h3 {
    @apply text-2xl md:text-3xl;
  }

  h4 {
    @apply text-xl md:text-2xl;
  }

  /* Links */
  a {
    @apply text-emerald-600 dark:text-emerald-400;
    transition: color 0.15s ease;
  }

  a:hover {
    @apply text-emerald-700 dark:text-emerald-300;
  }

  /* Selection */
  ::selection {
    @apply bg-emerald-500/20 text-emerald-900 dark:text-emerald-100;
  }
}

@layer components {

  /* Scrollbar */
  .custom-scrollbar::-webkit-scrollbar {
    @apply w-2 h-2;
  }

  .custom-scrollbar::-webkit-scrollbar-track {
    @apply bg-slate-100 dark:bg-slate-800;
  }

  .custom-scrollbar::-webkit-scrollbar-thumb {
    @apply bg-emerald-400 dark:bg-emerald-600 rounded-full;
    transition: background-color 0.2s ease;
  }

  .custom-scrollbar::-webkit-scrollbar-thumb:hover {
    @apply bg-emerald-500;
  }

  /* Fade in animation */
  @keyframes fadeIn {
    from {
      opacity: 0;
      transform: translateY(10px);
    }

    to {
      opacity: 1;
      transform: translateY(0);
    }
  }

  .animate-fade-in {
    animation: fadeIn 0.3s ease-out;
  }

  /* Slide in animation */
  @keyframes slideIn {
    from {
      opacity: 0;
      transform: translateX(-20px);
    }

    to {
      opacity: 1;
      transform: translateX(0);
    }
  }

  .animate-slide-in {
    animation: slideIn 0.3s ease-out;
  }

  /* Scale in animation */
  @keyframes scaleIn {
    from {
      opacity: 0;
      transform: scale(0.95);
    }

    to {
      opacity: 1;
      transform: scale(1);
    }
  }

  .animate-scale-in {
    animation: scaleIn 0.2s ease-out;
  }

  /* Slide up animation for mobile sheets */
  @keyframes slideUp {
    from {
      opacity: 0;
      transform: translateY(100%);
    }

    to {
      opacity: 1;
      transform: translateY(0);
    }
  }

  .animate-slide-up {
    animation: slideUp 0.3s ease-out;
  }

  /* No scrollbar utility */
  .no-scrollbar::-webkit-scrollbar {
    display: none;
  }

  .no-scrollbar {
    -ms-overflow-style: none;
    scrollbar-width: none;
  }

  /* Shimmer effect */
  @keyframes shimmer {
    0% {
      background-position: -1000px 0;
    }

    100% {
      background-position: 1000px 0;
    }
  }

  .animate-shimmer {
    background: linear-gradient(90deg,
        rgba(255, 255, 255, 0) 0%,
        rgba(255, 255, 255, 0.2) 50%,
        rgba(255, 255, 255, 0) 100%);
    background-size: 1000px 100%;
    animation: shimmer 2s infinite;
  }
}

@layer utilities {

  /* Screen reader only - visually hidden but accessible */
  .sr-only {
    position: absolute !important;
    width: 1px !important;
    height: 1px !important;
    padding: 0 !important;
    margin: -1px !important;
    overflow: hidden !important;
    clip: rect(0, 0, 0, 0) !important;
    white-space: nowrap !important;
    border: 0 !important;
  }

  /* Not screen reader only - opposite of sr-only */
  .not-sr-only {
    position: static !important;
    width: auto !important;
    height: auto !important;
    padding: 0 !important;
    margin: 0 !important;
    overflow: visible !important;
    clip: auto !important;
    white-space: normal !important;
  }

  /* Focus visible only (hide when not keyboard focused) */
  .focus-visible-only:not(:focus-visible) {
    @apply sr-only;
  }

  /* High contrast mode enhancements */
  @media (prefers-contrast: more) {
    .high-contrast-border {
      @apply border-2 border-current;
    }

    .high-contrast-text {
      font-weight: 600;
    }

    /* Increase button contrast */
    button:not([disabled]),
    [role="button"]:not([disabled]) {
      @apply border border-current;
    }

    /* Stronger focus indicator */
    *:focus-visible {
      @apply ring-4 ring-offset-4;
    }
  }

  /* Large text mode support */
  .text-scalable {
    font-size: clamp(1rem, 2vw, 1.25rem);
    line-height: 1.6;
  }

  /* Respect user motion preferences */
  .motion-safe {
    @media (prefers-reduced-motion: no-preference) {
      transition: all 0.3s ease;
    }
  }

  .motion-reduce {
    @media (prefers-reduced-motion: reduce) {
      transition: none;
      animation: none;
    }
  }

  /* Touch-friendly spacing */
  .touch-target {
    min-height: 44px;
    min-width: 44px;
    @apply flex items-center justify-center;
  }

  /* Color blind friendly patterns */
  .pattern-stripe {
    background-image: repeating-linear-gradient(45deg,
        transparent,
        transparent 5px,
        currentColor 5px,
        currentColor 10px);
    opacity: 0.1;
  }

  .pattern-dots {
    background-image: radial-gradient(currentColor 1px,
        transparent 1px);
    background-size: 8px 8px;
    opacity: 0.1;
  }
}