/* CSS Nâng Cao cho Game */
.game-section {
  --bg-color: var(--bg-primary);
  --text-color: var(--text-primary);
  --primary-color: var(--accent-primary);
  --gradient-primary: var(--gradient-text);

  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 100px 20px 60px;
  text-align: center;
  position: relative;
  overflow: hidden;
  background: var(--bg-color);
}

/* Hiệu ứng nền dịu mắt */
.game-section::before {
  content: '';
  position: absolute;
  top: 10%;
  left: 15%;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(99, 102, 241, 0.15), transparent 70%);
  border-radius: 50%;
  pointer-events: none;
  filter: blur(50px);
}
.game-section::after {
  content: '';
  position: absolute;
  bottom: 10%;
  right: 15%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(236, 72, 153, 0.1), transparent 70%);
  border-radius: 50%;
  pointer-events: none;
  filter: blur(60px);
}

[data-theme="light"] .game-section::before {
  background: radial-gradient(circle, rgba(99, 102, 241, 0.25), transparent 70%);
}
[data-theme="light"] .game-section::after {
  background: radial-gradient(circle, rgba(236, 72, 153, 0.2), transparent 70%);
}

.game-card {
  background: rgba(30,30,35,0.4);
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: 1.5rem;
  padding: 3rem;
  max-width: 500px;
  width: 100%;
  box-shadow: 0 25px 50px rgba(0,0,0,0.2), inset 0 1px 0 rgba(255,255,255,0.05);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  position: relative;
  z-index: 10;
  transition: transform 0.3s ease;
}

[data-theme="light"] .game-card {
  background: rgba(255, 255, 255, 0.6);
  border: 1px solid rgba(255, 255, 255, 1);
  box-shadow: 0 25px 50px rgba(0,0,0,0.05), inset 0 1px 0 rgba(255,255,255,1);
}

.game-title, .game-header .section-title {
  font-size: 2.2rem;
  margin-bottom: 2rem;
  color: var(--text-color);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.8rem;
}
.game-title i {
  color: var(--primary-color);
  filter: drop-shadow(0 0 10px rgba(99, 102, 241, 0.5));
}
.game-title span, .game-header .section-title {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  font-weight: 800;
  letter-spacing: -0.5px;
}

.game-setup, .game-play, .game-over, .game-lobby, .game-screen { 
  display: none; 
  opacity: 0;
  transition: opacity 0.4s ease, transform 0.4s ease;
  transform: translateY(15px);
}
.game-setup.active, .game-play.active, .game-over.active, .game-lobby.active, .game-screen.active {
  display: block;
  opacity: 1;
  transform: translateY(0);
}

.game-input {
  width: 100%;
  padding: 1rem 1.2rem;
  font-size: 1.25rem;
  border-radius: 0.75rem;
  border: 1px solid rgba(255,255,255,0.1);
  background: rgba(0,0,0,0.2);
  color: var(--text-color);
  margin-bottom: 1.2rem;
  text-align: center;
  font-family: inherit;
  transition: all 0.3s ease;
  box-shadow: inset 0 2px 4px rgba(0,0,0,0.1);
}
.game-input:focus {
  outline: none;
  border-color: var(--primary-color);
  background: rgba(0,0,0,0.3);
  box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.2), inset 0 2px 4px rgba(0,0,0,0.1);
}

[data-theme="light"] .game-input {
  background: rgba(255,255,255,0.8);
  border: 1px solid rgba(0,0,0,0.1);
}
[data-theme="light"] .game-input:focus {
  background: #ffffff;
}

.game-btn {
  width: 100%;
  padding: 1rem;
  border-radius: 0.75rem;
  font-weight: 700;
  font-size: 1.1rem;
  cursor: pointer;
  background: linear-gradient(135deg, var(--primary-color), #4f46e5);
  border: none;
  color: white;
  box-shadow: 0 8px 20px rgba(99, 102, 241, 0.3);
  transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}
.game-btn:hover {
  transform: translateY(-3px);
  box-shadow: 0 12px 25px rgba(99, 102, 241, 0.4);
}
.game-btn:active {
  transform: translateY(0);
}

.game-btn.secondary, .game-btn.btn-outline {
  background: transparent;
  border: 2px solid var(--primary-color);
  color: var(--primary-color);
  box-shadow: none;
}
.game-btn.secondary:hover, .game-btn.btn-outline:hover {
  background: rgba(99, 102, 241, 0.1);
  box-shadow: 0 8px 20px rgba(99, 102, 241, 0.15);
}
.game-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none !important;
}

.range-display {
  font-size: 4.5rem;
  font-weight: 900;
  margin: 2.5rem 0;
  font-family: 'JetBrains Mono', monospace;
  color: var(--text-color);
  letter-spacing: -2px;
  transition: transform 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 15px;
}

.range-display .dash {
  color: var(--text-secondary);
  font-size: 3rem;
  font-weight: 400;
}

.range-display.pop {
  transform: scale(1.15);
  filter: drop-shadow(0 0 15px rgba(99, 102, 241, 0.4));
}

.turn-indicator {
  display: inline-block;
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--bg-color);
  background: var(--text-color);
  padding: 0.4rem 1.2rem;
  border-radius: 20px;
  margin-bottom: 0.5rem;
  box-shadow: 0 4px 10px rgba(0,0,0,0.1);
}

[data-theme="dark"] .turn-indicator {
  background: var(--text-color);
  color: var(--bg-color);
}

.history-log {
  max-height: 180px;
  overflow-y: auto;
  text-align: left;
  margin-top: 1.5rem;
  padding: 1.2rem;
  background: rgba(0,0,0,0.15);
  border: 1px solid rgba(255,255,255,0.05);
  border-radius: 0.75rem;
  font-size: 0.95rem;
  color: var(--text-secondary);
  box-shadow: inset 0 2px 10px rgba(0,0,0,0.1);
  scrollbar-width: thin;
  scrollbar-color: var(--primary-color) transparent;
}

[data-theme="light"] .history-log {
  background: rgba(255,255,255,0.5);
  border: 1px solid rgba(0,0,0,0.05);
}

.history-log::-webkit-scrollbar {
  width: 6px;
}
.history-log::-webkit-scrollbar-thumb {
  background-color: var(--primary-color);
  border-radius: 10px;
}

.history-log p { 
  margin-bottom: 0.6rem; 
  padding-bottom: 0.6rem;
  border-bottom: 1px solid rgba(255,255,255,0.05);
  line-height: 1.4;
}
[data-theme="light"] .history-log p {
  border-bottom-color: rgba(0,0,0,0.05);
}
.history-log p:last-child {
  border-bottom: none;
  margin-bottom: 0;
  padding-bottom: 0;
}
.history-log p::before {
  content: '>';
  color: var(--primary-color);
  margin-right: 8px;
  font-family: 'JetBrains Mono', monospace;
  font-weight: bold;
}

.setup-group, .input-group {
  margin-bottom: 1.8rem;
  text-align: left;
}
.setup-group label, .input-group label {
  display: block;
  margin-bottom: 0.6rem;
  font-weight: 600;
  color: var(--text-secondary);
  font-size: 0.95rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.room-code-display {
  font-family: 'JetBrains Mono', monospace;
  font-size: 2.8rem;
  font-weight: 900;
  letter-spacing: 8px;
  color: var(--primary-color);
  background: rgba(99, 102, 241, 0.1);
  border: 2px dashed rgba(99, 102, 241, 0.3);
  border-radius: 1rem;
  padding: 1rem 1.5rem;
  margin: 1.5rem 0;
  text-align: center;
  cursor: pointer;
  transition: all 0.3s ease;
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 15px;
}
.room-code-display:hover {
  background: rgba(99, 102, 241, 0.15);
  border-color: rgba(99, 102, 241, 0.5);
}

.copy-btn {
  background: none;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  font-size: 1.5rem;
}
.copy-btn:hover {
  color: var(--primary-color);
}

.lobby-players {
  list-style: none;
  padding: 0;
  margin: 1.2rem 0;
}
.lobby-players li {
  padding: 0.7rem 1rem;
  margin-bottom: 0.5rem;
  border-radius: 0.5rem;
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.06);
  color: var(--text-color);
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 0.6rem;
}
[data-theme="light"] .lobby-players li {
  background: rgba(0,0,0,0.03);
  border-color: rgba(0,0,0,0.06);
}
.lobby-players li .host-badge {
  font-size: 0.7rem;
  background: var(--primary-color);
  color: white;
  padding: 2px 8px;
  border-radius: 10px;
  margin-left: auto;
}
.lobby-players li i {
  color: var(--primary-color);
}

.online-name-input { margin-bottom: 1rem; }
.online-actions, .lobby-actions {
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
  margin-bottom: 1.5rem;
}
@media (min-width: 500px) {
  .online-actions, .lobby-actions { flex-direction: row; }
}

.room-code-badge {
  display: inline-block;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 2px;
  color: var(--primary-color);
  background: rgba(99, 102, 241, 0.1);
  border: 1px solid rgba(99, 102, 241, 0.2);
  border-radius: 8px;
  padding: 0.3rem 0.8rem;
  margin-bottom: 0.8rem;
}

.join-room-group { display: none; margin-top: 1rem; }
.join-room-group.active { display: block; }
.join-room-group input { margin-bottom: 1rem; width: 100%; }

.status-message {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin: 0.8rem 0;
  min-height: 1.2em;
}
.status-message.error { color: #ef4444; }
.status-message.success { color: #22c55e; }

.connecting-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.8);
  backdrop-filter: blur(5px);
  z-index: 9999;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 1rem;
  color: #fff;
}
.connecting-overlay.active { display: flex; }
.connecting-overlay .spinner {
  width: 40px;
  height: 40px;
  border: 4px solid rgba(255,255,255,0.1);
  border-top-color: var(--primary-color);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.divider {
  display: flex;
  align-items: center;
  text-align: center;
  color: var(--text-muted);
  font-weight: 600;
  font-size: 0.8rem;
  margin: 10px 0;
}
.divider::before, .divider::after {
  content: '';
  flex: 1;
  border-bottom: 1px solid var(--border);
}
.divider span { padding: 0 10px; }