/* Auth Modal */
.auth-modal {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(11, 12, 16, 0.85);
  backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
}

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

.auth-container {
  background: var(--panel);
  border-radius: 12px;
  width: 100%;
  max-width: 420px;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
  overflow: hidden;
  transform: translateY(20px);
  transition: transform 0.3s ease;
}

.auth-modal.active .auth-container {
  transform: translateY(0);
}

.auth-header {
  padding: 20px 24px;
  border-bottom: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.auth-header h2 {
  margin: 0;
  font-size: 20px;
  font-weight: 600;
}

.close-btn {
  background: none;
  border: none;
  color: var(--muted);
  font-size: 24px;
  cursor: pointer;
  padding: 0;
  line-height: 1;
  transition: color 0.2s ease;
}

.close-btn:hover {
  color: var(--text);
}

.auth-tabs {
  display: flex;
  border-bottom: 1px solid var(--border);
}

.tab-btn {
  flex: 1;
  padding: 16px;
  background: none;
  border: none;
  color: var(--muted);
  font-size: 15px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
  position: relative;
}

.tab-btn.active {
  color: var(--text);
}

.tab-btn.active::after {
  content: '';
  position: absolute;
  bottom: -1px;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--grad-a), var(--grad-b));
}

.auth-form {
  padding: 24px;
}

.form-group {
  margin-bottom: 16px;
}

.form-group label {
  display: block;
  margin-bottom: 8px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text);
}

.form-control {
  width: 100%;
  padding: 12px 14px;
  background: var(--primary);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  font-size: 15px;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.form-control:focus {
  outline: none;
  border-color: var(--grad-b);
  box-shadow: 0 0 0 2px rgba(79, 134, 255, 0.2);
}

.btn-auth {
  width: 100%;
  padding: 14px;
  border: none;
  border-radius: 6px;
  font-size: 15px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
  margin-top: 8px;
}

.btn-primary {
  background: linear-gradient(90deg, var(--grad-a), var(--grad-b));
  color: white;
}

.btn-primary:hover:not(:disabled) {
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.btn-primary:disabled {
  opacity: 0.7;
  cursor: not-allowed;
}

.auth-footer {
  padding: 16px 24px 24px;
  text-align: center;
  font-size: 14px;
  color: var(--muted);
  border-top: 1px solid var(--border);
}

.auth-footer a {
  color: var(--grad-b);
  text-decoration: none;
  font-weight: 500;
  margin-left: 4px;
  cursor: pointer;
}

.auth-footer a:hover {
  text-decoration: underline;
}

.error-message {
  color: #ff6b6b;
  font-size: 14px;
  margin-top: 8px;
  display: none;
}

.error-message.show {
  display: block;
}

.loading-spinner {
  display: inline-block;
  width: 16px;
  height: 16px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-radius: 50%;
  border-top-color: white;
  animation: spin 1s ease-in-out infinite;
  margin-right: 8px;
  vertical-align: middle;
}

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

/* Responsive */
@media (max-width: 480px) {
  .auth-container {
    max-width: 90%;
    margin: 0 16px;
  }
  
  .auth-form {
    padding: 20px;
  }
  
  .auth-header {
    padding: 16px 20px;
  }
  
  .tab-btn {
    padding: 14px 12px;
    font-size: 14px;
  }
}