/* 登录按钮 */
.btn-login {
  width: 100%;
  padding: 12px;
  background: var(--color-primary);
  color: white;
  border: none;
  border-radius: var(--radius-md);
  font-size: 17px;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-base);
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 8px;
  position: relative;
  overflow: hidden;
}

.btn-login:hover:not(:disabled) {
  background: var(--color-primary-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(24, 144, 255, 0.3);
}

.btn-login:active:not(:disabled) {
  transform: translateY(0);
}

.btn-login:disabled {
  background: #bfbfbf;
  cursor: not-allowed;
}

/* 按钮加载状态 */
.btn-login .spinner {
  display: none;
  width: 18px;
  height: 18px;
  border: 2px solid rgba(255,255,255,0.3);
  border-top: 2px solid white;
  border-radius: var(--radius-round);
  animation: spin 1s linear infinite;
}

.btn-login.loading .spinner {
  display: inline-block;
}

.btn-login.loading span {
  opacity: 0;
}

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