.app {
  min-height: 100vh;
  background: linear-gradient(180deg, #f8f9fa 0%, #ffffff 100%);
  color: #333333;
}

.app-header {
  text-align: center;
  padding: 40px 20px;
  border-bottom: 1px solid #e9ecef;
  position: relative;
}

.app-nav {
  display: flex;
  justify-content: center;
  gap: 8px;
  padding: 20px;
  background: rgba(0, 0, 0, 0.02);
  border-bottom: 1px solid #e9ecef;
  margin-bottom: 40px;
}

.nav-button {
  padding: 12px 20px;
  border: 1px solid #dee2e6;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.8);
  color: #6c757d;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.3s ease;
  backdrop-filter: blur(10px);
}

.nav-button:hover {
  background: rgba(102, 126, 234, 0.1);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
  color: #495057;
}

.nav-button.active {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  border: 1px solid #667eea;
  box-shadow: 0 4px 16px rgba(102, 126, 234, 0.4);
}

.nav-button.active:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(102, 126, 234, 0.5);
}

.app-header h1 {
  font-size: 48px;
  margin: 0;
  background: linear-gradient(90deg, #fff700 0%, #ff00ff 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.app-header p {
  color: #6c757d;
  margin-top: 10px;
}

.user-info {
  position: absolute;
  top: 20px;
  right: 20px;
  display: flex;
  align-items: center;
  gap: 15px;
}

.user-handle {
  color: #495057;
  font-weight: bold;
  background: rgba(102, 126, 234, 0.1);
  padding: 6px 12px;
  border-radius: 20px;
  border: 1px solid #dee2e6;
}

.login-button,
.logout-button,
.backup-button,
.token-button {
  padding: 8px 16px;
  border: none;
  border-radius: 8px;
  font-size: 12px;
  font-weight: bold;
  cursor: pointer;
  transition: all 0.3s ease;
  margin-left: 8px;
}

.login-button {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  border: 1px solid #667eea;
}

.backup-button {
  background: linear-gradient(135deg, #28a745 0%, #20c997 100%);
  color: white;
  border: 1px solid #28a745;
}

.token-button {
  background: linear-gradient(135deg, #ffc107 0%, #fd7e14 100%);
  color: white;
  border: 1px solid #ffc107;
}

.logout-button {
  background: rgba(108, 117, 125, 0.1);
  color: #495057;
  border: 1px solid #dee2e6;
}

.login-button:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(102, 126, 234, 0.4);
}

.backup-button:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(40, 167, 69, 0.4);
}

.token-button:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(255, 193, 7, 0.4);
}

.logout-button:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
  background: rgba(108, 117, 125, 0.2);
}

.loading {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100vh;
  font-size: 24px;
  color: #667eea;
}

.app-main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 40px 20px;
}

.gacha-section {
  text-align: center;
  margin-bottom: 60px;
}

.gacha-section h2 {
  font-size: 32px;
  margin-bottom: 30px;
}

.gacha-buttons {
  display: flex;
  gap: 20px;
  justify-content: center;
  flex-wrap: wrap;
}

.gacha-button {
  padding: 20px 40px;
  font-size: 18px;
  font-weight: bold;
  border: none;
  border-radius: 12px;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  cursor: pointer;
  transition: all 0.3s ease;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
}

.gacha-button:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.4);
}

.gacha-button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.gacha-button-premium {
  background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
  position: relative;
  overflow: hidden;
}

.gacha-button-premium::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: linear-gradient(
    45deg,
    transparent 30%,
    rgba(255, 255, 255, 0.2) 50%,
    transparent 70%
  );
  animation: shimmer 3s infinite;
}

.collection-section h2 {
  font-size: 32px;
  text-align: center;
  margin-bottom: 30px;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 30px;
  justify-items: center;
}

.empty-message {
  text-align: center;
  color: #6c757d;
  font-size: 18px;
  margin-top: 40px;
}

.error {
  color: #ff4757;
  text-align: center;
  margin-top: 20px;
}

@keyframes shimmer {
  0% { transform: translateX(-100%) rotate(45deg); }
  100% { transform: translateX(100%) rotate(45deg); }
}