/* ============================================
   AI Challenge Competition - Design System
   Dark Tech Theme with Neon Glow Effects
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&family=Orbitron:wght@400;500;600;700;800;900&display=swap');

/* ===== CSS Variables ===== */
:root {
  --bg-primary: #0a0e1a;
  --bg-secondary: #111827;
  --bg-card: rgba(17, 24, 39, 0.8);
  --bg-glass: rgba(255, 255, 255, 0.05);
  --bg-glass-hover: rgba(255, 255, 255, 0.1);
  
  --text-primary: #f0f4ff;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  
  --neon-blue: #00d4ff;
  --neon-purple: #a855f7;
  --neon-green: #22d3ee;
  --neon-pink: #f472b6;
  --neon-orange: #fb923c;
  --neon-yellow: #fbbf24;
  
  --gradient-main: linear-gradient(135deg, #00d4ff 0%, #a855f7 100%);
  --gradient-warm: linear-gradient(135deg, #f472b6 0%, #fb923c 100%);
  --gradient-cool: linear-gradient(135deg, #22d3ee 0%, #6366f1 100%);
  --gradient-success: linear-gradient(135deg, #22d3ee 0%, #10b981 100%);
  
  --glow-blue: 0 0 20px rgba(0, 212, 255, 0.3), 0 0 40px rgba(0, 212, 255, 0.1);
  --glow-purple: 0 0 20px rgba(168, 85, 247, 0.3), 0 0 40px rgba(168, 85, 247, 0.1);
  --glow-green: 0 0 20px rgba(34, 211, 238, 0.3), 0 0 40px rgba(34, 211, 238, 0.1);
  
  --border-glass: 1px solid rgba(255, 255, 255, 0.1);
  --border-glow: 1px solid rgba(0, 212, 255, 0.3);
  
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  
  --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.3);
  --shadow-elevated: 0 16px 64px rgba(0, 0, 0, 0.5);
  
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-bounce: all 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  overflow-x: hidden;
  line-height: 1.6;
}

/* Animated background */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: 
    radial-gradient(ellipse at 20% 50%, rgba(0, 212, 255, 0.08) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 20%, rgba(168, 85, 247, 0.08) 0%, transparent 50%),
    radial-gradient(ellipse at 50% 80%, rgba(34, 211, 238, 0.05) 0%, transparent 50%);
  pointer-events: none;
  z-index: 0;
}

/* ===== Typography ===== */
h1, h2, h3, h4, h5, h6 {
  font-family: 'Orbitron', sans-serif;
  font-weight: 700;
  letter-spacing: 0.02em;
}

h1 { font-size: 2.5rem; line-height: 1.2; }
h2 { font-size: 2rem; line-height: 1.3; }
h3 { font-size: 1.5rem; line-height: 1.4; }

.gradient-text {
  background: var(--gradient-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ===== Layout ===== */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
  position: relative;
  z-index: 1;
}

.page-wrapper {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  position: relative;
  z-index: 1;
}

/* ===== Glass Card ===== */
.glass-card {
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: var(--border-glass);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow-card);
  transition: var(--transition);
}

.glass-card:hover {
  border-color: rgba(0, 212, 255, 0.2);
  box-shadow: var(--shadow-card), var(--glow-blue);
}

.glass-card--no-hover:hover {
  border-color: rgba(255, 255, 255, 0.1);
  box-shadow: var(--shadow-card);
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: var(--radius-md);
  font-family: 'Inter', sans-serif;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
  white-space: nowrap;
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.15), transparent);
  transition: left 0.5s;
}

.btn:hover::before {
  left: 100%;
}

.btn-primary {
  background: var(--gradient-main);
  color: white;
  box-shadow: var(--glow-blue);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 30px rgba(0, 212, 255, 0.5), 0 0 60px rgba(0, 212, 255, 0.2);
}

.btn-success {
  background: var(--gradient-success);
  color: white;
  box-shadow: var(--glow-green);
}

.btn-success:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 30px rgba(34, 211, 238, 0.5);
}

.btn-danger {
  background: linear-gradient(135deg, #ef4444, #dc2626);
  color: white;
}

.btn-danger:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 20px rgba(239, 68, 68, 0.4);
}

.btn-warning {
  background: var(--gradient-warm);
  color: white;
}

.btn-ghost {
  background: var(--bg-glass);
  color: var(--text-primary);
  border: var(--border-glass);
}

.btn-ghost:hover {
  background: var(--bg-glass-hover);
  border-color: rgba(0, 212, 255, 0.3);
}

.btn-lg {
  padding: 1rem 2.5rem;
  font-size: 1.2rem;
  border-radius: var(--radius-lg);
}

.btn-sm {
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
}

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

/* ===== Input ===== */
.input-group {
  margin-bottom: 1.5rem;
}

.input-group label {
  display: block;
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
  font-weight: 500;
}

.input {
  width: 100%;
  padding: 0.875rem 1.25rem;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 1rem;
  font-family: 'Inter', sans-serif;
  transition: var(--transition);
  outline: none;
}

.input:focus {
  border-color: var(--neon-blue);
  box-shadow: 0 0 0 3px rgba(0, 212, 255, 0.1);
}

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

select.input {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' fill='%2394a3b8'%3E%3Cpath d='M7 10l5 5 5-5z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.75rem center;
  padding-right: 2.5rem;
}

/* ===== Navigation / Header ===== */
.navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 2rem;
  background: rgba(10, 14, 26, 0.95);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  position: sticky;
  top: 0;
  z-index: 100;
}

.navbar-brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-family: 'Orbitron', sans-serif;
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--text-primary);
  text-decoration: none;
}

.navbar-brand .logo-icon {
  font-size: 1.75rem;
}

.navbar-info {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.group-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  background: var(--bg-glass);
  border: var(--border-glow);
  border-radius: var(--radius-xl);
  font-size: 0.875rem;
  color: var(--neon-blue);
  font-weight: 600;
}

.score-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  background: rgba(168, 85, 247, 0.15);
  border: 1px solid rgba(168, 85, 247, 0.3);
  border-radius: var(--radius-xl);
  font-size: 0.875rem;
  color: var(--neon-purple);
  font-weight: 700;
  font-family: 'Orbitron', sans-serif;
}

/* ===== Game Cards Grid ===== */
.games-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
  padding: 2rem 0;
}

.game-card {
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  border: var(--border-glass);
  border-radius: var(--radius-lg);
  padding: 2rem;
  cursor: pointer;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.game-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

.game-card:nth-child(1)::before { background: var(--gradient-main); }
.game-card:nth-child(2)::before { background: var(--gradient-warm); }
.game-card:nth-child(3)::before { background: var(--gradient-cool); }
.game-card:nth-child(4)::before { background: var(--gradient-success); }
.game-card:nth-child(5)::before { background: linear-gradient(135deg, #fbbf24, #f97316); }

.game-card:hover {
  transform: translateY(-8px);
  border-color: rgba(0, 212, 255, 0.3);
  box-shadow: var(--shadow-elevated), var(--glow-blue);
}

.game-card .game-icon {
  font-size: 3rem;
  margin-bottom: 1rem;
}

.game-card .game-title {
  font-family: 'Orbitron', sans-serif;
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.game-card .game-desc {
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.6;
}

.game-card .game-score {
  margin-top: 1rem;
  font-family: 'Orbitron', sans-serif;
  color: var(--neon-purple);
  font-weight: 700;
}

/* ===== Timer ===== */
.timer {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  background: rgba(239, 68, 68, 0.15);
  border: 1px solid rgba(239, 68, 68, 0.3);
  border-radius: var(--radius-xl);
  font-family: 'Orbitron', sans-serif;
  font-size: 1.5rem;
  font-weight: 700;
  color: #ef4444;
}

.timer.timer-warning {
  animation: pulse-warning 1s infinite;
}

@keyframes pulse-warning {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.6; }
}

/* ===== Video Player ===== */
.video-container {
  width: 100%;
  max-width: 800px;
  margin: 0 auto;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: var(--border-glass);
  background: #000;
}

.video-container video {
  width: 100%;
  display: block;
}

.video-exhausted {
  width: 100%;
  max-width: 800px;
  margin: 0 auto;
  padding: 4rem 2rem;
  text-align: center;
  background: rgba(0, 0, 0, 0.5);
  border-radius: var(--radius-lg);
  border: 1px solid rgba(255, 255, 255, 0.05);
}

/* ===== Canvas Drawing ===== */
.canvas-container {
  position: relative;
  background: white;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 2px solid rgba(0, 212, 255, 0.3);
  box-shadow: var(--glow-blue);
}

.canvas-container canvas {
  display: block;
  cursor: crosshair;
}

.canvas-tools {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1rem;
  background: var(--bg-card);
  border-top: var(--border-glass);
  flex-wrap: wrap;
}

.canvas-tools .tool-group {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

/* ===== Status Indicators ===== */
.status-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  display: inline-block;
}

.status-dot--online {
  background: #22c55e;
  box-shadow: 0 0 8px rgba(34, 197, 94, 0.5);
  animation: pulse-dot 2s infinite;
}

.status-dot--offline {
  background: #64748b;
}

@keyframes pulse-dot {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.3); }
}

/* ===== Modal ===== */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 999;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
}

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

.modal {
  background: var(--bg-secondary);
  border: var(--border-glass);
  border-radius: var(--radius-xl);
  padding: 2.5rem;
  max-width: 480px;
  width: 90%;
  box-shadow: var(--shadow-elevated);
  transform: scale(0.9);
  transition: var(--transition);
}

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

/* ===== Waiting State ===== */
.waiting-state {
  text-align: center;
  padding: 3rem 2rem;
}

.waiting-state .spinner {
  width: 48px;
  height: 48px;
  border: 3px solid rgba(0, 212, 255, 0.1);
  border-top-color: var(--neon-blue);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin: 0 auto 1.5rem;
}

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

/* ===== Answer Buttons ===== */
.answer-buttons {
  display: flex;
  gap: 1.5rem;
  justify-content: center;
  flex-wrap: wrap;
  margin-top: 2rem;
}

.answer-btn {
  padding: 1.25rem 3rem;
  font-size: 1.125rem;
  border-radius: var(--radius-lg);
  font-weight: 700;
  min-width: 200px;
}

.answer-btn.selected {
  transform: scale(1.05);
}

/* ===== Face Comparison ===== */
.face-pair {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  max-width: 800px;
  margin: 0 auto;
}

.face-option {
  cursor: pointer;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 3px solid transparent;
  transition: var(--transition);
  position: relative;
}

.face-option:hover {
  border-color: var(--neon-blue);
  transform: scale(1.02);
  box-shadow: var(--glow-blue);
}

.face-option.selected {
  border-color: var(--neon-green);
  box-shadow: var(--glow-green);
}

.face-option img {
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
  display: block;
}

.face-label {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 0.75rem;
  background: rgba(0, 0, 0, 0.7);
  text-align: center;
  font-weight: 600;
  font-size: 1.1rem;
}

/* ===== Result Display ===== */
.result-correct {
  color: #22c55e;
  font-weight: 700;
}

.result-wrong {
  color: #ef4444;
  font-weight: 700;
}

.result-banner {
  padding: 1.5rem;
  border-radius: var(--radius-md);
  text-align: center;
  font-size: 1.25rem;
  font-weight: 700;
  margin: 1.5rem 0;
}

.result-banner.correct {
  background: rgba(34, 197, 94, 0.15);
  border: 1px solid rgba(34, 197, 94, 0.3);
  color: #22c55e;
}

.result-banner.wrong {
  background: rgba(239, 68, 68, 0.15);
  border: 1px solid rgba(239, 68, 68, 0.3);
  color: #ef4444;
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
  h1 { font-size: 1.75rem; }
  h2 { font-size: 1.5rem; }
  
  .container { padding: 0 1rem; }
  .glass-card { padding: 1.5rem; }
  .navbar { padding: 0.75rem 1rem; }
  
  .games-grid {
    grid-template-columns: 1fr;
  }
  
  .face-pair {
    grid-template-columns: 1fr;
  }
  
  .answer-buttons {
    flex-direction: column;
    align-items: center;
  }
}

/* ===== Animations ===== */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes scaleIn {
  from {
    opacity: 0;
    transform: scale(0.8);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

@keyframes slideInLeft {
  from {
    opacity: 0;
    transform: translateX(-30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

.animate-fadeInUp { animation: fadeInUp 0.6s ease-out forwards; }
.animate-scaleIn { animation: scaleIn 0.5s ease-out forwards; }
.animate-slideInLeft { animation: slideInLeft 0.5s ease-out forwards; }

.delay-1 { animation-delay: 0.1s; }
.delay-2 { animation-delay: 0.2s; }
.delay-3 { animation-delay: 0.3s; }
.delay-4 { animation-delay: 0.4s; }
.delay-5 { animation-delay: 0.5s; }

/* ===== Utility ===== */
.text-center { text-align: center; }
.text-right { text-align: right; }
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.flex { display: flex; }
.flex-center { display: flex; align-items: center; justify-content: center; }
.flex-between { display: flex; align-items: center; justify-content: space-between; }
.gap-1 { gap: 0.5rem; }
.gap-2 { gap: 1rem; }
.gap-3 { gap: 1.5rem; }
.hidden { display: none !important; }

/* Scrollbar */
::-webkit-scrollbar {
  width: 8px;
}
::-webkit-scrollbar-track {
  background: var(--bg-primary);
}
::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.15);
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: rgba(255, 255, 255, 0.25);
}