puzzle-trainer/app/globals.css

@import "tailwindcss";

/* ── Design tokens ──────────────────────────────────────────────────────────── */
:root {
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-full: 9999px;

  --shadow-card: 0 1px 3px 0 rgb(0 0 0 / 0.06), 0 1px 2px -1px rgb(0 0 0 / 0.04);
  --shadow-hover: 0 4px 12px 0 rgb(0 0 0 / 0.08), 0 2px 4px -1px rgb(0 0 0 / 0.05);
  --shadow-win: 0 8px 24px 0 rgb(34 197 94 / 0.18);

  --transition-base: 150ms ease;
  --transition-smooth: 250ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* ── PWA / iOS native feel ──────────────────────────────────────────────────── */
html, body {
  /* Full height accounting for iOS dynamic viewport */
  height: 100%;
  min-height: -webkit-fill-available;
}

body {
  /* Prevent bounce scroll on iOS (native app feel) */
  overscroll-behavior: none;
  /* Prevent text selection on interactive elements */
  -webkit-touch-callout: none;
}

/* Tap targets: no highlight flash on iOS */
* { -webkit-tap-highlight-color: transparent; }

/* Game grids: no text selection, instant touch response */
.game-grid, [data-game-grid] {
  touch-action: manipulation;
  user-select: none;
  -webkit-user-select: none;
}

/* ── Reset & base ───────────────────────────────────────────────────────────── */
* { box-sizing: border-box; }

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

body {
  background: #f8fafc;
  color: #09090b;
  font-family: -apple-system, BlinkMacSystemFont, "Inter", "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  line-height: 1.5;
}

/* ── Focus visible ──────────────────────────────────────────────────────────── */
:focus-visible {
  outline: 2px solid #3b82f6;
  outline-offset: 2px;
  border-radius: 4px;
}

/* ── Scrollbar ──────────────────────────────────────────────────────────────── */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: #d1d5db; border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: #9ca3af; }

/* ── Page fade-in ───────────────────────────────────────────────────────────── */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}

main > div { animation: fadeUp 0.25s ease both; }

/* ── Win banner animation ───────────────────────────────────────────────────── */
@keyframes popIn {
  0%   { transform: scale(0.85); opacity: 0; }
  60%  { transform: scale(1.04); }
  100% { transform: scale(1); opacity: 1; }
}

.win-banner {
  animation: popIn 0.38s cubic-bezier(0.34, 1.56, 0.64, 1) both;
}

/* ── Cell flash (win feedback) ──────────────────────────────────────────────── */
@keyframes cellWin {
  0%   { background-color: inherit; }
  40%  { background-color: #bbf7d0; }
  100% { background-color: inherit; }
}

.cell-win { animation: cellWin 0.6s ease both; }

/* ── Shake animation (error) ────────────────────────────────────────────────── */
@keyframes shake {
  0%, 100% { transform: translateX(0); }
  20%       { transform: translateX(-4px); }
  40%       { transform: translateX(4px); }
  60%       { transform: translateX(-3px); }
  80%       { transform: translateX(3px); }
}

.shake { animation: shake 0.35s ease; }

/* ── Skeleton loading ───────────────────────────────────────────────────────── */
@keyframes shimmer {
  0%   { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}

.skeleton {
  background: linear-gradient(90deg, #f1f5f9 25%, #e2e8f0 50%, #f1f5f9 75%);
  background-size: 200% 100%;
  animation: shimmer 1.4s ease infinite;
  border-radius: var(--radius-md);
}

/* ── Progress bar ───────────────────────────────────────────────────────────── */
.progress-track {
  height: 5px;
  border-radius: var(--radius-full);
  background: #e2e8f0;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  border-radius: var(--radius-full);
  transition: width 0.7s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ── Timer display ──────────────────────────────────────────────────────────── */
.timer-mono {
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.05em;
}

/* ── Pulse ring (current level) ─────────────────────────────────────────────── */
@keyframes pulseRing {
  0%, 100% { box-shadow: 0 0 0 0px currentColor; }
  50%       { box-shadow: 0 0 0 3px currentColor; }
}

.level-current { animation: pulseRing 1.8s ease-in-out infinite; }

/* ── Solved card overlay ────────────────────────────────────────────────────── */
.card-solved {
  position: relative;
}
.card-solved::after {
  content: "✓";
  position: absolute;
  top: 6px;
  right: 8px;
  font-size: 11px;
  font-weight: 700;
  color: #16a34a;
  opacity: 0.8;
}

/* ── Dark mode ──────────────────────────────────────────────────────────────── */
@media (prefers-color-scheme: dark) {
  html { color-scheme: dark; }

  body {
    background: #0f1117;
    color: #f1f5f9;
  }

  /* Cards & panels */
  .bg-white { background: #1e2130 !important; }
  .border-gray-100 { border-color: #2a2f42 !important; }
  .border-gray-200 { border-color: #363b52 !important; }
  .bg-gray-50 { background: #181c27 !important; }
  .bg-gray-100 { background: #252a3a !important; }

  /* Text */
  .text-gray-900 { color: #f1f5f9 !important; }
  .text-gray-800 { color: #e2e8f0 !important; }
  .text-gray-700 { color: #cbd5e1 !important; }
  .text-gray-600 { color: #94a3b8 !important; }
  .text-gray-500 { color: #64748b !important; }
  .text-gray-400 { color: #475569 !important; }
  .text-gray-300 { color: #374151 !important; }

  /* Header */
  header { background: rgba(15, 17, 23, 0.92) !important; border-color: #1e2130 !important; }

  /* Footer */
  footer { background: #0f1117 !important; border-color: #1e2130 !important; }

  /* Skeleton */
  .skeleton {
    background: linear-gradient(90deg, #1e2130 25%, #252a3a 50%, #1e2130 75%) !important;
  }

  /* Progress track */
  .progress-track { background: #252a3a !important; }

  /* Scrollbar */
  ::-webkit-scrollbar-thumb { background: #363b52; }
  ::-webkit-scrollbar-thumb:hover { background: #475569; }

  /* Bottom nav */
  nav.fixed.bottom-0 { background: rgba(15, 17, 23, 0.95) !important; border-color: #1e2130 !important; }
}