/* ============================================
   Alphabet Mastery - Styles
   Color Palette: --primary #333333, --secondary #fbe814
   ============================================ */

:root {
  --primary: #333333;
  --secondary: #fbe814;
  --bg: #1a1a1a;
  --card: #252525;
  --text: #f5f5f5;
  --muted: #888;
  --error: #ff3b30;
  --success: #fbe814;
  --shadow: 0 4px 24px rgba(0,0,0,0.5);
  --transition: 150ms ease;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
@media (prefers-reduced-motion: reduce) { * { animation: none !important; transition: none !important; } }

html, body { height: 100%; }
body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  line-height: 1.5;
}

/* Header */
header {
  padding: 1rem 1.5rem;
  background: var(--primary);
  border-bottom: 2px solid var(--secondary);
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  align-items: center;
  justify-content: space-between;
}
h1 { font-size: 1.5rem; font-weight: 700; color: var(--secondary); letter-spacing: 0.05em; }
.header-controls { display: flex; gap: 0.75rem; align-items: center; flex-wrap: wrap; }
.caps-indicator {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 0.75rem;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  background: var(--card);
  border: 2px solid var(--muted);
  color: var(--muted);
  transition: all var(--transition);
}
.caps-indicator.active { border-color: var(--secondary); color: var(--secondary); background: rgba(251,232,20,0.1); }
.toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  border: 2px solid var(--secondary);
  border-radius: 999px;
  background: transparent;
  color: var(--secondary);
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
}
.toggle:hover, .toggle:focus { background: var(--secondary); color: var(--primary); outline: none; }
.toggle:focus-visible { outline: 2px solid var(--secondary); outline-offset: 2px; }

/* Main */
main { flex: 1; display: flex; flex-direction: column; align-items: center; justify-content: center; padding: 2rem 1rem; gap: 1.5rem; }

/* Target Letter Display */
.target-container { position: relative; display: flex; flex-direction: column; align-items: center; gap: 0.5rem; }
.target-letter {
  font-size: 15vw;
  max-width: 180px;
  font-weight: 800;
  color: var(--secondary);
  text-shadow:
    0 0 0 var(--primary),
    2px 2px 0 var(--primary),
    4px 4px 0 var(--primary),
    6px 6px 12px rgba(0,0,0,0.6);
  line-height: 1;
  transition: transform var(--transition), box-shadow var(--transition);
  animation: idle-pulse 3s ease-in-out infinite;
  user-select: none;
}
@keyframes idle-pulse { 0%, 100% { transform: scale(1); } 50% { transform: scale(1.02); } }
.target-letter.correct { animation: pulse-correct 300ms ease; }
@keyframes pulse-correct { 0% { transform: scale(1); } 50% { transform: scale(1.15); box-shadow: 0 0 30px var(--secondary); } 100% { transform: scale(1); } }
.target-letter.incorrect { animation: shake 400ms ease; }
@keyframes shake { 0%, 100% { transform: translateX(0); } 20% { transform: translateX(-8px); } 40% { transform: translateX(8px); } 60% { transform: translateX(-6px); } 80% { transform: translateX(6px); } }
.target-letter.ripple::after {
  content: '';
  position: absolute;
  inset: -20px;
  border-radius: 50%;
  background: radial-gradient(circle, var(--secondary) 0%, transparent 70%);
  opacity: 0;
  animation: ripple 400ms ease-out forwards;
  pointer-events: none;
}
@keyframes ripple { 0% { transform: scale(0); opacity: 0.6; } 100% { transform: scale(2.5); opacity: 0; } }
.helper-text { font-size: 1rem; color: var(--muted); font-weight: 500; text-transform: uppercase; letter-spacing: 0.1em; }

/* Progress Bar */
.progress-container { width: 100%; max-width: 600px; }
.progress-bar {
  display: flex;
  gap: 4px;
  height: 12px;
  border-radius: 6px;
  background: var(--card);
  padding: 3px;
  box-shadow: inset 0 2px 8px rgba(0,0,0,0.5);
}
.progress-segment {
  flex: 1;
  border-radius: 3px;
  background: var(--primary);
  transition: background var(--transition), transform var(--transition);
}
.progress-segment.completed { background: var(--secondary); transform: scaleY(1.1); }
.progress-segment.current { background: var(--secondary); opacity: 0.5; animation: segment-pulse 1s ease-in-out infinite; }
@keyframes segment-pulse { 0%, 100% { opacity: 0.5; } 50% { opacity: 1; } }
.progress-labels { display: flex; gap: 4px; margin-top: 0.5rem; font-size: 0.55rem; font-weight: 600; color: var(--muted); text-transform: uppercase; }
.progress-labels span { flex: 1; text-align: center; }
.progress-labels span.completed { color: var(--secondary); }

/* Stats Bar */
.stats-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  justify-content: center;
  padding: 1rem 1.5rem;
  background: var(--card);
  border: 1px solid var(--primary);
  border-radius: 12px;
  box-shadow: var(--shadow);
  font-family: 'SF Mono', 'Fira Code', 'Monospace';
  font-size: 0.9rem;
}
.stat { display: flex; flex-direction: column; align-items: center; gap: 0.25rem; }
.stat-label { font-size: 0.65rem; text-transform: uppercase; letter-spacing: 0.1em; color: var(--muted); font-weight: 600; }
.stat-value { font-size: 1.5rem; font-weight: 700; color: var(--secondary); }
.stat-value.errors { color: var(--error); }

/* Alphabet Reference Strip */
.alphabet-reference {
  width: 100%;
  max-width: 800px;
  padding: 1rem;
  background: var(--card);
  border: 1px solid var(--primary);
  border-radius: 12px;
  box-shadow: var(--shadow);
}
.alphabet-reference-title { font-size: 0.7rem; text-transform: uppercase; letter-spacing: 0.1em; color: var(--muted); margin-bottom: 0.5rem; font-weight: 600; text-align: center; }
.alphabet-strip { display: flex; gap: 4px; justify-content: center; flex-wrap: wrap; }
.alpha-key {
  min-width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.85rem;
  font-weight: 700;
  border-radius: 6px;
  background: var(--primary);
  border: 2px solid var(--primary);
  color: var(--text);
  transition: all var(--transition);
  position: relative;
}
.alpha-key.completed { background: var(--secondary); color: var(--primary); border-color: var(--secondary); }
.alpha-key.current { background: rgba(251,232,20,0.2); border-color: var(--secondary); color: var(--secondary); box-shadow: 0 0 12px rgba(251,232,20,0.4); animation: alpha-pulse 1.5s ease-in-out infinite; }
@keyframes alpha-pulse { 0%, 100% { box-shadow: 0 0 12px rgba(251,232,20,0.4); } 50% { box-shadow: 0 0 20px rgba(251,232,20,0.6); } }
.alpha-key.error { background: var(--error); color: var(--secondary); border-color: var(--error); }
.alpha-key .mistake-count {
  position: absolute;
  bottom: -2px;
  right: -2px;
  font-size: 0.55rem;
  font-weight: 700;
  background: var(--error);
  color: var(--secondary);
  border-radius: 999px;
  min-width: 12px;
  height: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 2px;
}

/* On-Screen Keyboard */
.keyboard-container { width: 100%; max-width: 800px; }
.keyboard { display: grid; grid-template-rows: repeat(4, 1fr); gap: 8px; }
.keyboard-row { display: flex; gap: 6px; justify-content: center; flex-wrap: wrap; }
.key {
  flex: 1;
  min-width: 0;
  max-width: 60px;
  aspect-ratio: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
  font-weight: 600;
  border-radius: 8px;
  background: var(--card);
  border: 2px solid var(--primary);
  color: var(--text);
  transition: all var(--transition);
  user-select: none;
  position: relative;
}
.key:not(.spacer):hover { border-color: var(--secondary); color: var(--secondary); transform: translateY(-2px); box-shadow: 0 4px 12px rgba(251,232,20,0.2); }
.key.target {
  border-color: var(--secondary);
  background: rgba(251,232,20,0.15);
  color: var(--secondary);
  box-shadow: 0 0 20px rgba(251,232,20,0.3);
  animation: key-pulse 1.5s ease-in-out infinite;
}
@keyframes key-pulse { 0%, 100% { box-shadow: 0 0 20px rgba(251,232,20,0.3); } 50% { box-shadow: 0 0 30px rgba(251,232,20,0.5); } }
.key.correct { animation: key-correct 300ms ease; }
@keyframes key-correct { 0% { transform: scale(1); } 50% { transform: scale(1.2); background: var(--secondary); color: var(--primary); } 100% { transform: scale(1); } }
.key.incorrect { animation: key-incorrect 300ms ease; }
@keyframes key-incorrect { 0%, 100% { transform: translateX(0); } 20% { transform: translateX(-4px); } 40% { transform: translateX(4px); } 60% { transform: translateX(-3px); } 80% { transform: translateX(3px); } }
.key.wide { flex: 1.5; max-width: 90px; }
.key.extra-wide { flex: 2; max-width: 120px; }
.key.spacer { background: transparent; border: none; }
.key-label { font-size: 0.55rem; position: absolute; top: 2px; left: 4px; opacity: 0.5; text-transform: lowercase; }

/* Mobile Touch Keyboard */
.mobile-keyboard { display: none; gap: 6px; justify-content: center; flex-wrap: wrap; padding: 1rem; }
.mobile-key {
  min-width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  font-weight: 600;
  border-radius: 10px;
  background: var(--card);
  border: 2px solid var(--primary);
  color: var(--text);
  transition: all var(--transition);
  -webkit-tap-highlight-color: transparent;
}
.mobile-key:active { transform: scale(0.95); background: var(--secondary); color: var(--primary); border-color: var(--secondary); }
.mobile-key.target { border-color: var(--secondary); background: rgba(251,232,20,0.15); color: var(--secondary); }
@media (max-width: 600px) {
  .keyboard-container { display: none; }
  .mobile-keyboard { display: flex; }
  .target-letter { font-size: 22vw; max-width: 280px; }
  .stats-bar { font-size: 0.8rem; gap: 1rem; padding: 0.75rem 1rem; }
  .stat-value { font-size: 1.25rem; }
  .alpha-key { min-width: 24px; height: 24px; font-size: 0.75rem; }
}

/* Modal Overlay */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.9);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: opacity 300ms ease, visibility 300ms ease;
}
.modal-overlay.visible { opacity: 1; visibility: visible; }
.modal {
  background: var(--card);
  border: 2px solid var(--secondary);
  border-radius: 16px;
  padding: 2rem;
  max-width: 500px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  text-align: center;
  box-shadow: var(--shadow);
  transform: scale(0.9);
  transition: transform 300ms ease;
}
.modal-overlay.visible .modal { transform: scale(1); }
.modal h2 { font-size: 1.75rem; color: var(--secondary); margin-bottom: 1.5rem; }

/* Summary Stats */
.modal-summary { display: grid; grid-template-columns: repeat(2, 1fr); gap: 0.75rem; margin-bottom: 1.5rem; font-family: 'SF Mono', 'Fira Code', monospace; }
.summary-stat { display: flex; flex-direction: column; align-items: center; padding: 1rem; background: var(--primary); border-radius: 12px; border: 1px solid var(--secondary); }
.summary-stat-label { font-size: 0.7rem; text-transform: uppercase; letter-spacing: 0.1em; color: var(--muted); font-weight: 600; margin-bottom: 0.25rem; }
.summary-stat-value { font-size: 1.75rem; font-weight: 700; color: var(--secondary); }
.summary-stat-value.errors { color: var(--error); }
.summary-stat-value.speed { color: var(--secondary); }

/* Alphabet Grid - Complete Slide */
.alphabet-grid-container { margin-bottom: 1.5rem; }
.alphabet-grid-title { font-size: 0.85rem; text-transform: uppercase; letter-spacing: 0.1em; color: var(--muted); margin-bottom: 0.75rem; font-weight: 600; }
.alphabet-grid { display: grid; grid-template-columns: repeat(13, 1fr); gap: 6px; }
.alphabet-key {
  aspect-ratio: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  font-weight: 700;
  border-radius: 8px;
  background: var(--primary);
  border: 2px solid var(--primary);
  color: var(--text);
  transition: all var(--transition);
  position: relative;
}
.alphabet-key.completed { background: var(--secondary); color: var(--primary); border-color: var(--secondary); }
.alphabet-key.error { background: var(--error); color: var(--secondary); border-color: var(--error); }
.alphabet-key.pending { opacity: 0.4; }
.alphabet-key .mistake-count,
.alphabet-key .mistake-badge {
  position: absolute;
  top: -6px;
  right: -6px;
  min-width: 16px;
  height: 16px;
  font-size: 0.6rem;
  font-weight: 700;
  background: var(--error);
  color: var(--secondary);
  border-radius: 999px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 4px;
}

/* Modal Actions */
.modal-actions { display: flex; gap: 1rem; justify-content: center; flex-wrap: wrap; }
.btn {
  padding: 1rem 2rem;
  font-size: 1rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border: none;
  border-radius: 999px;
  cursor: pointer;
  transition: all var(--transition);
  min-width: 140px;
}
.btn-primary {
  background: var(--secondary);
  color: var(--primary);
}
.btn-primary:hover, .btn-primary:focus { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(251,232,20,0.4); outline: none; }
.btn:focus-visible { outline: 2px solid var(--secondary); outline-offset: 3px; }

/* Ranking Comparison */
.ranking-container { margin: 1rem 0; padding: 1rem; background: var(--primary); border-radius: 12px; border: 1px solid var(--secondary); text-align: left; }
.ranking-title { font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.1em; color: var(--muted); margin-bottom: 0.75rem; font-weight: 600; }
.ranking-stats { display: grid; grid-template-columns: repeat(2, 1fr); gap: 0.5rem; }
.ranking-stat { display: flex; flex-direction: column; gap: 0.25rem; }
.ranking-stat-label { font-size: 0.65rem; text-transform: uppercase; letter-spacing: 0.05em; color: var(--muted); font-weight: 600; }
.ranking-stat-row { display: flex; align-items: center; justify-content: space-between; gap: 0.5rem; }
.ranking-stat-value { font-family: 'SF Mono', 'Fira Code', monospace; font-size: 1rem; font-weight: 700; }
.ranking-stat-value.current { color: var(--secondary); }
.ranking-stat-value.previous { color: var(--muted); }
.ranking-diff { font-size: 0.75rem; font-weight: 700; padding: 0.15rem 0.5rem; border-radius: 999px; }
.ranking-diff.improved { background: rgba(59, 226, 134, 0.2); color: #3be286; }
.ranking-diff.declined { background: rgba(255, 59, 48, 0.2); color: var(--error); }
.ranking-diff.same { background: rgba(136, 136, 136, 0.2); color: var(--muted); }

.ranking-summary { margin-top: 0.75rem; padding: 0.5rem 0.75rem; border-radius: 8px; font-size: 0.75rem; font-weight: 600; text-align: center; }
.ranking-summary.improved { background: rgba(59, 226, 134, 0.15); color: #3be286; border: 1px solid rgba(59, 226, 134, 0.3); }
.ranking-summary.declined { background: rgba(255, 59, 48, 0.15); color: var(--error); border: 1px solid rgba(255, 59, 48, 0.3); }
.ranking-summary.mixed { background: rgba(251, 232, 20, 0.15); color: var(--secondary); border: 1px solid rgba(251, 232, 20, 0.3); }
.ranking-summary.same { background: rgba(136, 136, 136, 0.15); color: var(--muted); border: 1px solid rgba(136, 136, 136, 0.3); }
.ranking-summary.first { background: rgba(251, 232, 20, 0.15); color: var(--secondary); border: 1px solid rgba(251, 232, 20, 0.3); }

/* Footer */
footer { padding: 1.5rem; text-align: center; color: var(--muted); font-size: 0.8rem; border-top: 1px solid var(--primary); }

/* Focus styles */
*:focus-visible { outline: 2px solid var(--secondary); outline-offset: 2px; }

/* Hidden utility */
.hidden { display: none !important; }