/*
 * Cross-Browser & Mobile Compatibility Patch
 * Applied before app styles so app classes can override where needed.
 *
 * Fixes:
 *  1. Touch highlight removal (iOS/Android)
 *  2. Touch-action for fast tap (removes 300ms delay on iOS)
 *  3. Input font-size ≥16px to prevent iOS auto-zoom on focus
 *  4. -webkit-text-size-adjust for orientation change
 *  5. oklch() color fallbacks for Safari < 15.4
 *  6. Safe-area-inset support (iPhone notch / Dynamic Island)
 *  7. -webkit-backdrop-filter for older Safari
 *  8. Overflow-x containment on mobile
 *  9. Smooth scroll & -webkit-overflow-scrolling
 * 10. Fixed-position GPU compositing fix for iOS Safari
 */

/* ── 1. Remove tap highlight on all interactive elements ─────────────────── */
*,
*::before,
*::after {
  -webkit-tap-highlight-color: transparent;
  -webkit-tap-highlight-color: rgba(0, 0, 0, 0);
}

/* ── 2. Fast tap — removes 300ms delay on iOS/old Android ───────────────── */
a,
button,
input,
select,
textarea,
label,
[role="button"],
[role="checkbox"],
[role="radio"],
[role="switch"],
[role="tab"],
[role="menuitem"] {
  touch-action: manipulation;
}

/* ── 3. Prevent iOS auto-zoom on form input focus ────────────────────────── */
input[type="text"],
input[type="number"],
input[type="email"],
input[type="password"],
input[type="search"],
input[type="tel"],
input[type="url"],
input[type="date"],
select,
textarea {
  font-size: max(16px, 1em);
}

/* ── 4. Prevent text scaling on orientation change ───────────────────────── */
html {
  -webkit-text-size-adjust: 100%;
  -moz-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

/* ── 5. oklch() fallbacks for Safari < 15.4 ─────────────────────────────── */
/* These are overridden by the app's own oklch values in browsers that support it. */
@supports not (color: oklch(0 0 0)) {
  :root {
    /* Slate */
    --color-slate-50:  #f8fafc;
    --color-slate-100: #f1f5f9;
    --color-slate-200: #e2e8f0;
    --color-slate-300: #cbd5e1;
    --color-slate-400: #94a3b8;
    --color-slate-500: #64748b;
    --color-slate-600: #475569;
    --color-slate-700: #334155;
    --color-slate-800: #1e293b;
    --color-slate-900: #0f172a;
    --color-slate-950: #020617;
    /* Blue */
    --color-blue-50:   #eff6ff;
    --color-blue-100:  #dbeafe;
    --color-blue-200:  #bfdbfe;
    --color-blue-300:  #93c5fd;
    --color-blue-400:  #60a5fa;
    --color-blue-500:  #3b82f6;
    --color-blue-600:  #2563eb;
    --color-blue-700:  #1d4ed8;
    --color-blue-800:  #1e40af;
    --color-blue-900:  #1e3a8a;
    --color-blue-950:  #172554;
    /* Amber */
    --color-amber-50:  #fffbeb;
    --color-amber-100: #fef3c7;
    --color-amber-300: #fcd34d;
    --color-amber-400: #fbbf24;
    --color-amber-500: #f59e0b;
    --color-amber-600: #d97706;
    --color-amber-900: #78350f;
    /* Green / Emerald */
    --color-green-400:   #4ade80;
    --color-green-500:   #22c55e;
    --color-green-600:   #16a34a;
    --color-emerald-400: #34d399;
    --color-emerald-500: #10b981;
    --color-emerald-600: #059669;
    /* Red */
    --color-red-50:  #fef2f2;
    --color-red-300: #fca5a5;
    --color-red-400: #f87171;
    --color-red-500: #ef4444;
    --color-red-600: #dc2626;
    --color-red-700: #b91c1c;
    --color-red-950: #450a0a;
    /* Indigo / Violet / Cyan / Pink */
    --color-indigo-400:  #818cf8;
    --color-indigo-500:  #6366f1;
    --color-indigo-600:  #4f46e5;
    --color-violet-400:  #a78bfa;
    --color-violet-500:  #8b5cf6;
    --color-violet-600:  #7c3aed;
    --color-cyan-400:    #22d3ee;
    --color-cyan-500:    #06b6d4;
    --color-cyan-600:    #0891b2;
    --color-pink-400:    #f472b6;
    --color-pink-500:    #ec4899;
    --color-yellow-400:  #facc15;
    --color-yellow-500:  #eab308;
  }
}

/* ── 6. Safe-area insets (iPhone notch / Dynamic Island / home bar) ──────── */
@supports (padding-top: env(safe-area-inset-top)) {
  /* Only add safe-area padding to the very bottom of the page for home bar */
  body {
    padding-bottom: env(safe-area-inset-bottom, 0px);
  }

  /* The fixed header needs to account for the status bar height on iPhone */
  header {
    padding-top: env(safe-area-inset-top, 0px);
  }
}

/* ── 7. -webkit-backdrop-filter for Safari < 14 ─────────────────────────── */
/*
 * Tailwind generates backdrop-filter but older Safari needs -webkit- prefix.
 * We target classes that include backdrop-blur to add the webkit version.
 */
[class*="backdrop-blur"],
[class*="backdrop-filter"] {
  -webkit-backdrop-filter: var(--tw-backdrop-blur) var(--tw-backdrop-brightness) var(--tw-backdrop-contrast) var(--tw-backdrop-grayscale) var(--tw-backdrop-hue-rotate) var(--tw-backdrop-invert) var(--tw-backdrop-opacity) var(--tw-backdrop-saturate) var(--tw-backdrop-sepia);
}

/* ── 8. Prevent horizontal overflow on mobile ───────────────────────────── */
html,
body {
  overflow-x: hidden;
  max-width: 100%;
}

/* ── 9. iOS momentum scrolling (smooth scroll on iPhone) ─────────────────── */
html {
  -webkit-overflow-scrolling: touch;
}

/* ── 10. GPU compositing for fixed-position elements (iOS Safari flicker fix) */
/*
 * iOS Safari occasionally causes fixed headers to flicker or disappear during
 * momentum scroll. translateZ(0) forces a compositing layer to fix this.
 */
[class*="fixed"] {
  -webkit-transform: translate3d(0, 0, 0);
  transform: translate3d(0, 0, 0);
  -webkit-backface-visibility: hidden;
  backface-visibility: hidden;
}

/* ── 11. Consistent box-sizing across browsers ───────────────────────────── */
*,
*::before,
*::after {
  box-sizing: border-box;
}

/* ── 12. Better font anti-aliasing across platforms ─────────────────────── */
body {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-smoothing: antialiased;
}

/* ── 13. Fix SVG rendering on Safari ─────────────────────────────────────── */
svg {
  overflow: hidden;
  vertical-align: middle;
  shape-rendering: auto;
}

/* ── 14. Prevent double-tap zoom on buttons specifically (iOS) ──────────── */
button:focus {
  outline: none;
}
button:focus-visible {
  outline: 2px solid currentColor;
  outline-offset: 2px;
}