/* ==========================================================================
   Schulte Table PWA - Design System & Custom Styles
   ========================================================================== */

/* 1. Design Tokens & Themes */
:root {
  --font-sans: 'Outfit', 'Noto Sans TC', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --transition-normal: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
  --transition-fast: all 0.15s cubic-bezier(0.25, 0.8, 0.25, 1);
  --border-radius-sm: 8px;
  --border-radius-md: 16px;
  --border-radius-lg: 24px;
  --max-width-app: 480px;

  /* Global Status Colors */
  --color-success: #2ec4b6;
  --color-warning: #ff9f1c;
  --color-danger: #e71d36;
}

/* Theme: Warm Sepia (Default Eye-Care Theme) */
.theme-warm-sepia {
  --bg-primary: hsl(38, 56%, 93%);
  --bg-secondary: hsl(38, 40%, 88%);
  --card-bg: hsla(38, 40%, 96%, 0.85);
  --text-primary: hsl(24, 30%, 20%);
  --text-secondary: hsl(24, 15%, 40%);
  --accent-color: hsl(165, 45%, 33%);
  --accent-hover: hsl(165, 50%, 26%);
  --border-color: hsl(38, 25%, 80%);
  --cell-bg: hsl(38, 50%, 96%);
  --cell-text: hsl(24, 30%, 20%);
  --cell-hover: hsl(38, 30%, 86%);
  --cell-correct-bg: hsl(165, 40%, 90%);
  --cell-correct-text: hsl(165, 50%, 20%);
  --shadow-color: rgba(92, 64, 51, 0.12);
  --overlay-bg: rgba(244, 236, 216, 0.85);
}

/* Theme: Dark Mode */
.theme-dark {
  --bg-primary: hsl(220, 15%, 10%);
  --bg-secondary: hsl(220, 15%, 15%);
  --card-bg: hsla(220, 15%, 16%, 0.85);
  --text-primary: hsl(220, 10%, 88%);
  --text-secondary: hsl(220, 10%, 60%);
  --accent-color: hsl(195, 75%, 43%);
  --accent-hover: hsl(195, 80%, 36%);
  --border-color: hsl(220, 15%, 22%);
  --cell-bg: hsl(220, 15%, 16%);
  --cell-text: hsl(220, 10%, 88%);
  --cell-hover: hsl(220, 15%, 26%);
  --cell-correct-bg: hsl(195, 60%, 22%);
  --cell-correct-text: hsl(195, 80%, 85%);
  --shadow-color: rgba(0, 0, 0, 0.4);
  --overlay-bg: rgba(15, 17, 23, 0.85);
}

/* Theme: High Contrast Yellow */
.theme-high-contrast {
  --bg-primary: #000000;
  --bg-secondary: #0d0d0d;
  --card-bg: #111111;
  --text-primary: #ffff00;
  --text-secondary: #ffffff;
  --accent-color: #ffff00;
  --accent-hover: #ffffff;
  --border-color: #ffff00;
  --cell-bg: #000000;
  --cell-text: #ffff00;
  --cell-hover: #222222;
  --cell-correct-bg: #ffff00;
  --cell-correct-text: #000000;
  --shadow-color: rgba(255, 255, 0, 0.05);
  --overlay-bg: rgba(0, 0, 0, 0.9);
}

/* 2. Base & Reset */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
  user-select: none;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  transition: var(--transition-normal);
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  padding: 10px;
  overflow-x: hidden;
}

/* PWA Standalone Mode Adjustments */
@media all and (display-mode: standalone) {
  body {
    padding-top: env(safe-area-inset-top);
    padding-bottom: env(safe-area-inset-bottom);
  }
}

/* App Layout Container */
.app-container {
  width: 100%;
  max-width: var(--max-width-app);
  background: var(--card-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-lg);
  box-shadow: 0 12px 40px var(--shadow-color);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  transition: var(--transition-normal);
}

/* 3. Header Styles */
.app-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.app-title {
  font-size: 1.5rem;
  font-weight: 800;
  letter-spacing: -0.5px;
  background: linear-gradient(135deg, var(--text-primary), var(--accent-color));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.icon-btn {
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  width: 44px;
  height: 44px;
  border-radius: 50%;
  display: flex;
  justify-content: center;
  align-items: center;
  cursor: pointer;
  transition: var(--transition-fast);
  outline: none;
}

.icon-btn:hover {
  background-color: var(--border-color);
  transform: scale(1.05);
}

.icon-btn svg {
  width: 20px;
  height: 20px;
}

/* 4. Status Bar & Fatigue Timer */
.status-section {
  display: flex;
  flex-direction: column;
  gap: 8px;
  background: var(--bg-secondary);
  padding: 12px;
  border-radius: var(--border-radius-md);
  border: 1px solid var(--border-color);
}

.session-info {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.9rem;
  font-weight: 600;
}

.badge {
  padding: 4px 8px;
  border-radius: 6px;
  font-size: 0.8rem;
  font-weight: 700;
}

.badge-warmup {
  background-color: var(--accent-color);
  color: var(--bg-primary);
}

.badge-normal {
  background-color: var(--border-color);
  color: var(--text-primary);
}

.fatigue-container {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.fatigue-label {
  display: flex;
  justify-content: space-between;
  font-size: 0.75rem;
  color: var(--text-secondary);
  font-weight: 600;
}

.fatigue-bar-bg {
  width: 100%;
  height: 6px;
  background-color: var(--border-color);
  border-radius: 3px;
  overflow: hidden;
}

.fatigue-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--color-success), var(--color-warning), var(--color-danger));
  transition: width 1s linear;
}

/* 5. Performance Timer */
.timer-section {
  text-align: center;
  padding: 8px 0;
}

.timer-display {
  font-family: 'Courier New', Courier, monospace;
  font-size: 3.2rem;
  font-weight: 800;
  letter-spacing: -1px;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.target-display {
  font-size: 1rem;
  color: var(--text-secondary);
  font-weight: 600;
}

#target-number-text {
  font-size: 1.4rem;
  color: var(--accent-color);
  font-weight: 800;
  display: inline-block;
  margin-left: 4px;
}

/* 6. Schulte Grid Workspace */
.game-board-container {
  position: relative;
  width: 100%;
  aspect-ratio: 1 / 1;
  background-color: var(--bg-secondary);
  border-radius: var(--border-radius-md);
  border: 1px solid var(--border-color);
  padding: 8px;
  box-shadow: inset 0 2px 8px var(--shadow-color);
  overflow: hidden;
}

.schulte-grid {
  display: grid;
  width: 100%;
  height: 100%;
  gap: 8px;
}

.schulte-grid.size-3 {
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: repeat(3, 1fr);
}

.schulte-grid.size-4 {
  grid-template-columns: repeat(4, 1fr);
  grid-template-rows: repeat(4, 1fr);
}

.schulte-grid.size-5 {
  grid-template-columns: repeat(5, 1fr);
  grid-template-rows: repeat(5, 1fr);
}

/* Grid Cell Button */
.grid-cell {
  background-color: var(--cell-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-sm);
  color: var(--cell-text);
  font-family: 'Outfit', sans-serif;
  font-size: clamp(1.4rem, 5vw, 2.2rem);
  font-weight: 800;
  display: flex;
  justify-content: center;
  align-items: center;
  cursor: pointer;
  transition: background-color 0.1s ease, transform 0.1s ease, box-shadow 0.1s ease;
  touch-action: manipulation; /* Eliminate double tap delay */
  box-shadow: 0 2px 4px var(--shadow-color);
}

.grid-cell:hover:not(:disabled) {
  background-color: var(--cell-hover);
}

.grid-cell:active:not(:disabled) {
  transform: scale(0.95);
  box-shadow: 0 1px 2px var(--shadow-color);
}

.grid-cell.correct {
  background-color: var(--cell-correct-bg);
  color: var(--cell-correct-text);
  border-color: var(--accent-color);
}

.grid-cell.error {
  animation: shake 0.2s ease-in-out;
  background-color: hsla(0, 80%, 90%, 0.9) !important;
  color: var(--color-danger) !important;
  border-color: var(--color-danger) !important;
}

/* Dark theme specific error styling */
.theme-dark .grid-cell.error {
  background-color: hsla(0, 80%, 20%, 0.9) !important;
}

/* Overlays (Countdown & Start) */
.countdown-overlay,
.grid-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: var(--overlay-bg);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 10;
  transition: opacity 0.3s ease;
}

.countdown-number {
  font-size: 5rem;
  font-weight: 800;
  color: var(--accent-color);
  animation: scale-up 1s ease-in-out infinite;
}

.hidden {
  opacity: 0 !important;
  pointer-events: none !important;
  display: none !important;
}

/* 7. Footer Focus Tip */
.eye-focus-tip {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 6px;
  font-size: 0.85rem;
  color: var(--text-secondary);
  font-weight: 600;
  text-align: center;
  padding: 4px 0;
}

.eye-icon {
  font-size: 1.1rem;
  animation: float 2s ease-in-out infinite;
}

/* 8. Controls Section */
.quick-controls {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.size-selector {
  display: flex;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  padding: 4px;
  border-radius: var(--border-radius-md);
  width: 100%;
}

.size-btn {
  flex: 1;
  background: transparent;
  border: none;
  color: var(--text-secondary);
  font-size: 0.95rem;
  font-weight: 700;
  padding: 10px 0;
  border-radius: var(--border-radius-sm);
  cursor: pointer;
  transition: var(--transition-fast);
}

.size-btn.active {
  background-color: var(--accent-color);
  color: var(--bg-primary);
  box-shadow: 0 4px 10px rgba(0,0,0,0.1);
}

.content-selector {
  display: flex;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  padding: 4px;
  border-radius: var(--border-radius-md);
  width: 100%;
}

.content-btn {
  flex: 1;
  background: transparent;
  border: none;
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 700;
  padding: 10px 0;
  border-radius: var(--border-radius-sm);
  cursor: pointer;
  transition: var(--transition-fast);
}

.content-btn.active {
  background-color: var(--accent-color);
  color: var(--bg-primary);
  box-shadow: 0 4px 10px rgba(0,0,0,0.1);
}

/* Switch Container */
.switch-container {
  display: flex;
  align-items: center;
  gap: 10px;
  cursor: pointer;
}

.switch-slider {
  position: relative;
  width: 44px;
  height: 24px;
  background-color: var(--border-color);
  border-radius: 12px;
  transition: var(--transition-fast);
}

.switch-slider::before {
  content: '';
  position: absolute;
  width: 18px;
  height: 18px;
  left: 3px;
  bottom: 3px;
  background-color: var(--bg-primary);
  border-radius: 50%;
  transition: var(--transition-fast);
}

input[type="checkbox"] {
  display: none;
}

input[type="checkbox"]:checked + .switch-slider {
  background-color: var(--accent-color);
}

input[type="checkbox"]:checked + .switch-slider::before {
  transform: translateX(20px);
}

.switch-label {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-primary);
}

/* General Button Styles */
.btn {
  padding: 10px 20px;
  border-radius: var(--border-radius-sm);
  border: none;
  font-family: var(--font-sans);
  font-weight: 700;
  cursor: pointer;
  transition: var(--transition-fast);
  display: inline-flex;
  justify-content: center;
  align-items: center;
  outline: none;
}

.btn-primary {
  background-color: var(--accent-color);
  color: var(--bg-primary);
}

.btn-primary:hover {
  background-color: var(--accent-hover);
  transform: translateY(-1px);
}

.btn-secondary {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
}

.btn-secondary:hover {
  background-color: var(--border-color);
}

.btn-success {
  background-color: var(--color-success);
  color: #ffffff;
}

.btn-success:hover {
  opacity: 0.9;
  transform: translateY(-1px);
}

.btn-danger {
  background-color: var(--color-danger);
  color: #ffffff;
}

.btn-danger:hover {
  opacity: 0.9;
}

.btn-large {
  padding: 14px 28px;
  font-size: 1.1rem;
  border-radius: var(--border-radius-md);
  box-shadow: 0 4px 12px var(--shadow-color);
}

/* ==========================================================================
   Modals (Glassmorphism & Interactive)
   ========================================================================== */
.modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background-color: rgba(0, 0, 0, 0.4);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 100;
  opacity: 1;
  transition: opacity 0.25s ease-in-out;
}

.modal.hidden {
  opacity: 0;
  pointer-events: none;
  display: none;
}

.modal-content {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-lg);
  width: 90%;
  max-width: 400px;
  max-height: 85vh;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.3);
  display: flex;
  flex-direction: column;
  animation: slide-in 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
  overflow: hidden;
}

.modal-large {
  max-width: 500px;
}

.modal-header {
  padding: 16px 20px;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.modal-header h2 {
  font-size: 1.2rem;
  font-weight: 800;
}

.close-btn {
  background: transparent;
  border: none;
  font-size: 1.8rem;
  color: var(--text-secondary);
  cursor: pointer;
  width: 32px;
  height: 32px;
  display: flex;
  justify-content: center;
  align-items: center;
}

.modal-body {
  padding: 20px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

/* Settings Styles */
.settings-group {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border-color);
}

.settings-group:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.settings-group h3 {
  font-size: 0.95rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.theme-options {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
}

.theme-btn {
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-sm);
  padding: 8px 4px;
  font-size: 0.8rem;
  font-weight: 700;
  cursor: pointer;
  text-align: center;
  transition: var(--transition-fast);
}

.theme-btn.active {
  box-shadow: 0 0 0 2px var(--accent-color);
}

.checkbox-setting {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
}

.checkbox-setting input {
  width: 18px;
  height: 18px;
  cursor: pointer;
}

.warmup-rounds-setting {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-weight: 600;
}

.warmup-rounds-setting input {
  width: 60px;
  padding: 6px;
  border-radius: 6px;
  border: 1px solid var(--border-color);
  background-color: var(--cell-bg);
  color: var(--text-primary);
  text-align: center;
  font-weight: bold;
}

.setting-desc {
  font-size: 0.75rem;
  color: var(--text-secondary);
  line-height: 1.4;
}

.danger-zone {
  border-top: 1px solid var(--border-color);
  padding-top: 16px;
}

/* Statistics Styles */
.pb-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
}

.pb-card {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-sm);
  padding: 10px;
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.pb-title {
  font-size: 0.75rem;
  color: var(--text-secondary);
  font-weight: 700;
}

.pb-time {
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--accent-color);
}

.chart-section {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.chart-wrapper {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-md);
  padding: 10px;
  width: 100%;
}

.chart-filters {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.chart-size-selectors,
.chart-content-selectors {
  display: flex;
  gap: 6px;
  justify-content: center;
}

.chart-size-btn,
.chart-content-btn {
  padding: 4px 12px;
  font-size: 0.8rem;
  border-radius: 20px;
  border: 1px solid var(--border-color);
  background: transparent;
  color: var(--text-secondary);
  font-weight: 700;
  cursor: pointer;
  transition: var(--transition-fast);
}

.chart-size-btn.active,
.chart-content-btn.active {
  background-color: var(--accent-color);
  color: var(--bg-primary);
}

.history-table-section {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.table-scroll {
  max-height: 150px;
  overflow-y: auto;
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-sm);
}

.history-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
  text-align: left;
}

.history-table th,
.history-table td {
  padding: 8px 12px;
  border-bottom: 1px solid var(--border-color);
}

.history-table th {
  background-color: var(--bg-secondary);
  font-weight: 700;
  position: sticky;
  top: 0;
}

.history-table tr:last-child td {
  border-bottom: none;
}

/* Success & Warning Modals Custom Colors */
.modal-success,
.modal-warning {
  padding: 30px;
  text-align: center;
  align-items: center;
  gap: 16px;
  max-width: 360px;
}

.modal-success-icon,
.modal-warning-icon {
  font-size: 4rem;
}

.modal-success-icon {
  animation: pop 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.modal-success h2 {
  color: var(--color-success);
  font-weight: 800;
}

.modal-warning h2 {
  color: var(--color-warning);
  font-weight: 800;
}

.modal-message {
  font-size: 0.95rem;
  line-height: 1.6;
  color: var(--text-primary);
}

.lockout-actions {
  display: flex;
  gap: 12px;
  width: 100%;
  margin-top: 10px;
}

.lockout-actions button {
  flex: 1;
}

.rest-timer-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  margin: 10px 0;
}

.rest-countdown {
  font-size: 4rem;
  font-weight: 800;
  color: var(--color-warning);
  font-family: monospace;
}

.rest-tip {
  font-size: 0.8rem;
  color: var(--text-secondary);
}

/* ==========================================================================
   Animations
   ========================================================================== */
@keyframes shake {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-6px); }
  75% { transform: translateX(6px); }
}

@keyframes scale-up {
  0% { transform: scale(0.8); opacity: 0.5; }
  50% { transform: scale(1.1); opacity: 1; }
  100% { transform: scale(0.8); opacity: 0.5; }
}

@keyframes slide-in {
  from { transform: translateY(30px); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

@keyframes pop {
  0% { transform: scale(0.5); }
  100% { transform: scale(1); }
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-4px); }
}

.pulse-text {
  animation: pulse-shadow 1.5s infinite;
}

@keyframes pulse-shadow {
  0%, 100% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.1); opacity: 0.8; }
}