/* ==============================================
   羽球排點系統 (Badminton Court Scheduler)
   Modern Dark Theme Design System
   ============================================== */

/* CSS Variables - Design Tokens */
:root {
  /* Colors - Dark Theme */
  --color-bg-primary: #0a0a0f;
  --color-bg-secondary: #12121a;
  --color-bg-card: #1a1a24;
  --color-bg-elevated: #22222e;
  
  /* Accent Colors - Badminton Inspired */
  --color-accent-primary: #00d4aa;
  --color-accent-secondary: #7c3aed;
  --color-accent-warning: #f59e0b;
  --color-accent-danger: #ef4444;
  --color-accent-success: #22c55e;
  
  /* Text Colors */
  --color-text-primary: #ffffff;
  --color-text-secondary: #a1a1aa;
  --color-text-muted: #71717a;
  
  /* Gradients */
  --gradient-primary: linear-gradient(135deg, #00d4aa 0%, #7c3aed 100%);
  --gradient-card: linear-gradient(145deg, rgba(26, 26, 36, 0.9), rgba(18, 18, 26, 0.9));
  --gradient-glow: radial-gradient(circle at center, rgba(0, 212, 170, 0.15), transparent 70%);
  
  /* Shadows */
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 20px rgba(0, 212, 170, 0.3);
  
  /* Border Radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;
  
  /* Spacing */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;
  
  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 2rem;
  --font-size-4xl: 2.5rem;
  
  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 400ms ease;
}

/* Reset & Base */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-family);
  background: var(--color-bg-primary);
  color: var(--color-text-primary);
  min-height: 100vh;
  line-height: 1.6;
  overflow-x: hidden;
}

/* Background Effects */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--gradient-glow);
  pointer-events: none;
  z-index: -1;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
}

h1 { font-size: var(--font-size-4xl); }
h2 { font-size: var(--font-size-3xl); }
h3 { font-size: var(--font-size-2xl); }
h4 { font-size: var(--font-size-xl); }

a {
  color: var(--color-accent-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-text-primary);
}

/* Layout Components */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-md);
}

.page {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  padding: var(--space-lg);
}

/* Header */
.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-md) 0;
  margin-bottom: var(--space-xl);
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: var(--font-size-xl);
  font-weight: 700;
}

.logo-icon {
  width: 40px;
  height: 40px;
  background: var(--gradient-primary);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
}

/* Cards */
.card {
  background: var(--gradient-card);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  transition: all var(--transition-base);
}

.card:hover {
  border-color: rgba(0, 212, 170, 0.3);
  box-shadow: var(--shadow-glow);
}

.card-header {
  margin-bottom: var(--space-md);
}

.card-title {
  font-size: var(--font-size-xl);
  margin-bottom: var(--space-xs);
}

.card-description {
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-lg);
  font-family: inherit;
  font-size: var(--font-size-base);
  font-weight: 600;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-base);
  text-decoration: none;
}

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

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow);
}

.btn-secondary {
  background: var(--color-bg-elevated);
  color: var(--color-text-primary);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.btn-secondary:hover {
  background: var(--color-bg-card);
  border-color: var(--color-accent-primary);
}

.btn-danger {
  background: var(--color-accent-danger);
  color: white;
}

.btn-danger:hover {
  background: #dc2626;
}

.btn-lg {
  padding: var(--space-lg) var(--space-xl);
  font-size: var(--font-size-lg);
}

.btn-sm {
  padding: var(--space-sm) var(--space-md);
  font-size: var(--font-size-sm);
}

.btn-block {
  width: 100%;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

/* Form Elements */
.form-group {
  margin-bottom: var(--space-md);
}

.form-label {
  display: block;
  margin-bottom: var(--space-sm);
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
}

.form-input,
.form-select {
  width: 100%;
  padding: var(--space-md);
  font-family: inherit;
  font-size: var(--font-size-base);
  color: var(--color-text-primary);
  background: var(--color-bg-secondary);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-md);
  outline: none;
  transition: all var(--transition-fast);
}

.form-input:focus,
.form-select:focus {
  border-color: var(--color-accent-primary);
  box-shadow: 0 0 0 3px rgba(0, 212, 170, 0.2);
}

.form-input::placeholder {
  color: var(--color-text-muted);
}

/* Level Selector */
.level-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: var(--space-sm);
}

.level-btn {
  aspect-ratio: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-lg);
  font-weight: 600;
  background: var(--color-bg-secondary);
  border: 2px solid transparent;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.level-btn:hover {
  border-color: var(--color-accent-primary);
}

.level-btn.selected {
  background: var(--gradient-primary);
  color: var(--color-bg-primary);
}

/* Level colors based on tier */
.level-btn[data-tier="beginner"] { border-color: #94a3b8; }
.level-btn[data-tier="elementary"] { border-color: #22c55e; }
.level-btn[data-tier="intermediate"] { border-color: #eab308; }
.level-btn[data-tier="advanced"] { border-color: #f97316; }
.level-btn[data-tier="expert"] { border-color: #ec4899; }
.level-btn[data-tier="professional"] { border-color: #06b6d4; }

/* Status Badges */
.badge {
  display: inline-flex;
  align-items: center;
  padding: var(--space-xs) var(--space-sm);
  font-size: var(--font-size-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-radius: var(--radius-full);
}

.badge-waiting {
  background: rgba(245, 158, 11, 0.2);
  color: var(--color-accent-warning);
}

.badge-playing {
  background: rgba(34, 197, 94, 0.2);
  color: var(--color-accent-success);
}

.badge-resting {
  background: rgba(124, 58, 237, 0.2);
  color: var(--color-accent-secondary);
}

/* Player List */
.player-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.player-item {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md);
  background: var(--color-bg-secondary);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.player-item:hover {
  background: var(--color-bg-elevated);
}

.player-avatar {
  width: 40px;
  height: 40px;
  background: var(--gradient-primary);
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
}

.player-info {
  flex: 1;
}

.player-name {
  font-weight: 600;
}

.player-level {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

/* Court Display */
.courts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-lg);
}

.court-card {
  background: var(--color-bg-card);
  border: 2px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.court-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-md);
  background: var(--color-bg-elevated);
}

.court-number {
  font-size: var(--font-size-lg);
  font-weight: 700;
}

.court-body {
  padding: var(--space-lg);
}

.court-teams {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-lg);
}

.court-team {
  flex: 1;
  text-align: center;
}

.court-vs {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--color-accent-primary);
}

/* QR Code Container */
.qr-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: var(--space-xl);
  background: white;
  border-radius: var(--radius-lg);
}

.qr-code {
  margin-bottom: var(--space-md);
}

.session-code {
  font-size: var(--font-size-3xl);
  font-weight: 700;
  letter-spacing: 0.2em;
  color: var(--color-bg-primary);
}

/* Connection Status */
.connection-status {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: var(--font-size-sm);
}

.connection-dot {
  width: 8px;
  height: 8px;
  border-radius: var(--radius-full);
  animation: pulse 2s infinite;
}

.connection-dot.connected {
  background: var(--color-accent-success);
}

.connection-dot.disconnected {
  background: var(--color-accent-danger);
  animation: none;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

/* Score Input */
.score-input-group {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.score-input {
  width: 80px;
  height: 80px;
  font-size: var(--font-size-3xl);
  font-weight: 700;
  text-align: center;
  background: var(--color-bg-secondary);
  border: 2px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-md);
  color: var(--color-text-primary);
}

.score-separator {
  font-size: var(--font-size-2xl);
  color: var(--color-text-muted);
}

/* Animations */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes slideIn {
  from { opacity: 0; transform: translateX(-20px); }
  to { opacity: 1; transform: translateX(0); }
}

.fade-in {
  animation: fadeIn var(--transition-base) forwards;
}

.slide-in {
  animation: slideIn var(--transition-base) forwards;
}

/* Toast Notifications */
.toast-container {
  position: fixed;
  bottom: var(--space-lg);
  right: var(--space-lg);
  z-index: 1000;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.toast {
  padding: var(--space-md) var(--space-lg);
  background: var(--color-bg-elevated);
  border-radius: var(--radius-md);
  border-left: 4px solid var(--color-accent-primary);
  box-shadow: var(--shadow-lg);
  animation: slideIn var(--transition-base) forwards;
}

.toast-error {
  border-left-color: var(--color-accent-danger);
}

.toast-success {
  border-left-color: var(--color-accent-success);
}

/* Modal */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.8);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-base);
}

.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.modal {
  background: var(--color-bg-card);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  max-width: 500px;
  width: 90%;
  transform: scale(0.9);
  transition: transform var(--transition-base);
}

.modal-overlay.active .modal {
  transform: scale(1);
}

/* Loading Spinner */
.spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--color-bg-elevated);
  border-top-color: var(--color-accent-primary);
  border-radius: var(--radius-full);
  animation: spin 1s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* Empty State */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-2xl);
  text-align: center;
  color: var(--color-text-muted);
}

.empty-state-icon {
  font-size: 48px;
  margin-bottom: var(--space-md);
}

/* Responsive */
@media (max-width: 768px) {
  :root {
    --font-size-4xl: 2rem;
    --font-size-3xl: 1.5rem;
  }
  
  .level-grid {
    grid-template-columns: repeat(6, 1fr);
  }
  
  .courts-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .page {
    padding: var(--space-md);
  }
  
  .card {
    padding: var(--space-md);
  }
}