/* ==========================================================================
   Linus LetterPro - Modes (Challenge, Endless, Picker Grid)
   ========================================================================== */

/* Category Picker Screen */
#picker-screen {
  background: radial-gradient(circle at center, #1E293B 0%, #0F172A 100%);
  display: flex;
  flex-direction: column;
}

.picker-header {
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px;
  background: rgba(30, 41, 59, 0.7);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border-color);
}

.picker-grid-container {
  flex: 1;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  padding: 24px 20px;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
  gap: 16px;
  max-width: 1080px;
  margin: 0 auto;
  width: 100%;
}

.picker-card {
  position: relative;
  background: var(--bg-card);
  border: 2px solid var(--border-color);
  border-radius: 20px;
  padding: 16px 12px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 6px;
  cursor: pointer;
  box-shadow: var(--shadow-3d);
  transition: transform 0.12s ease, border-color 0.12s ease, background 0.12s ease;
}

.picker-card:hover {
  background: var(--bg-card-hover);
  border-color: #60A5FA;
  transform: translateY(-3px);
}

.picker-card:active {
  transform: translateY(2px);
}

.picker-card.mastered {
  border-color: #10B981;
  background: rgba(16, 185, 129, 0.1);
}

.picker-card-emoji {
  font-size: 26px;
}

.picker-card-char {
  font-size: 32px;
  font-weight: 900;
  color: var(--text-main);
  line-height: 1.1;
}

.picker-card-stars {
  font-size: 14px;
  color: #FBBF24;
  letter-spacing: 2px;
}

.badge-mastered {
  position: absolute;
  top: 8px;
  right: 8px;
  background: #10B981;
  color: white;
  font-size: 9px;
  font-weight: 800;
  padding: 2px 6px;
  border-radius: 8px;
}

/* ==========================================================================
   10-Minute Challenge Mode HUD
   ========================================================================== */

#challenge-hud {
  display: none;
  align-items: center;
  gap: 16px;
  background: rgba(220, 38, 38, 0.25);
  border: 1px solid #EF4444;
  padding: 6px 14px;
  border-radius: 16px;
}

#challenge-timer-display {
  font-size: 18px;
  font-weight: 800;
  color: #FCA5A5;
  font-variant-numeric: tabular-nums;
}

#challenge-timer-display.urgent {
  color: #EF4444;
  animation: urgentBlink 0.5s infinite alternate;
}

#challenge-progress-count {
  font-size: 13px;
  font-weight: 700;
  color: var(--text-main);
}

@keyframes urgentBlink {
  from { opacity: 1; transform: scale(1); }
  to { opacity: 0.5; transform: scale(1.05); }
}

/* ==========================================================================
   Endless Mode HUD
   ========================================================================== */

#endless-hud {
  display: none;
  align-items: center;
  gap: 14px;
  background: rgba(124, 58, 237, 0.25);
  border: 1px solid #8B5CF6;
  padding: 6px 14px;
  border-radius: 16px;
}

#endless-score {
  font-size: 17px;
  font-weight: 800;
  color: #FDE047;
}

#endless-streak {
  font-size: 13px;
  font-weight: 700;
  color: #C4B5FD;
}