/**
 * 认证页面样式 (登录/注册/忘记密码)
 * 使用设计系统
 */

/* ============================================
   1. 认证容器
   ============================================ */

.auth-container {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  padding: var(--space-6);
}

/* ============================================
   2. 认证卡片
   ============================================ */

.auth-card {
  width: 100%;
  max-width: 450px;
  background: var(--bg-primary);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  padding: var(--space-12);
  animation: slideInUp var(--duration-normal) var(--ease-decelerate);
}

/* ============================================
   3. Logo 和标题
   ============================================ */

.auth-logo {
  width: 60px;
  height: 60px;
  margin: 0 auto var(--space-6);
  display: block;
  animation: bounceIn var(--duration-slow) var(--ease-bounce);
}

.auth-title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  text-align: center;
  margin-bottom: var(--space-2);
  color: var(--text-primary);
}

.auth-subtitle {
  font-size: var(--font-size-base);
  text-align: center;
  color: var(--text-secondary);
  margin-bottom: var(--space-10);
}

/* ============================================
   4. 表单组
   ============================================ */

.form-group {
  margin-bottom: var(--space-4);
}

.form-label {
  display: block;
  margin-bottom: var(--space-2);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--text-primary);
}

.form-label.required::after {
  content: ' *';
  color: var(--color-error);
}

.form-control {
  width: 100%;
  height: var(--input-height-lg);
  padding: 0 var(--space-4);
  font-size: var(--font-size-base);
  font-family: var(--font-primary);
  color: var(--text-primary);
  background-color: var(--bg-primary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-md);
  transition: var(--transition-fast);
  outline: none;
}

.form-control::placeholder {
  color: var(--text-tertiary);
}

.form-control:hover:not(:disabled) {
  border-color: var(--color-gray-500);
}

.form-control:focus {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-focus);
}

.form-control:disabled {
  background-color: var(--bg-secondary);
  cursor: not-allowed;
  opacity: 0.6;
}

.form-control.error {
  border-color: var(--color-error);
}

.form-control.error:focus {
  box-shadow: var(--shadow-error);
}

.form-error {
  display: block;
  margin-top: var(--space-2);
  font-size: var(--font-size-sm);
  color: var(--color-error);
  min-height: 20px;
}

.form-error:empty {
  display: none;
  margin-top: 0;
  min-height: 0;
}

.form-hint {
  display: block;
  margin-top: var(--space-2);
  font-size: var(--font-size-xs);
  color: var(--text-secondary);
}

/* ============================================
   5. 密码输入框
   ============================================ */

.password-input-wrapper {
  position: relative;
}

.password-toggle {
  position: absolute;
  right: var(--space-4);
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  padding: var(--space-2);
  border-radius: var(--radius-sm);
  transition: var(--transition-fast);
}

.password-toggle:hover {
  color: var(--text-primary);
  background: var(--bg-hover);
}

.password-toggle:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* ============================================
   6. 密码强度指示器
   ============================================ */

.password-strength {
  height: 4px;
  background: var(--bg-secondary);
  border-radius: var(--radius-sm);
  margin-top: var(--space-2);
  overflow: hidden;
}

.password-strength-bar {
  height: 100%;
  transition: width var(--duration-normal) var(--ease-standard),
              background-color var(--duration-normal) var(--ease-standard);
  width: 0;
}

.password-strength-bar.strength-0 { 
  width: 0%; 
  background-color: transparent; 
}

.password-strength-bar.strength-1 { 
  width: 25%; 
  background-color: var(--color-error); 
}

.password-strength-bar.strength-2 { 
  width: 50%; 
  background-color: var(--color-warning); 
}

.password-strength-bar.strength-3 { 
  width: 75%; 
  background-color: var(--color-primary); 
}

.password-strength-bar.strength-4 { 
  width: 100%; 
  background-color: var(--color-success); 
}

.password-strength-text {
  display: block;
  margin-top: var(--space-1);
  font-size: var(--font-size-xs);
  color: var(--text-secondary);
}

/* ============================================
   7. 复选框
   ============================================ */

.form-checkbox {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.form-checkbox input[type="checkbox"] {
  width: 18px;
  height: 18px;
  cursor: pointer;
  accent-color: var(--color-primary);
}

.form-checkbox label {
  cursor: pointer;
  user-select: none;
  font-size: var(--font-size-sm);
  color: var(--text-primary);
}

/* ============================================
   8. 按钮
   ============================================ */

.btn-block {
  width: 100%;
}

.auth-card .btn {
  position: relative;
  overflow: hidden;
  /* 禁用浏览器默认的点击效果 */
  -webkit-tap-highlight-color: transparent;
  -webkit-touch-callout: none;
  -webkit-user-select: none;
  user-select: none;
}

/* 移除点击时的outline和focus ring */
.auth-card .btn:active,
.auth-card .btn:focus {
  outline: none;
}

/* 添加自定义的点击反馈 - Gmail风格 */
.auth-card .btn-primary:active:not(:disabled) {
  background-color: #1765cc;
  box-shadow: 0 1px 2px 0 rgba(60,64,67,0.3);
  transform: translateY(0);
}

.auth-card .btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

/* ============================================
   9. 验证码输入
   ============================================ */

.verification-code-wrapper {
  display: flex;
  gap: var(--space-3);
  justify-content: center;
  margin: var(--space-6) 0;
}

.verification-code-input {
  width: 48px;
  height: 56px;
  text-align: center;
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  border: 2px solid var(--border-primary);
  border-radius: var(--radius-md);
  transition: var(--transition-fast);
}

.verification-code-input:hover {
  border-color: var(--color-gray-500);
}

.verification-code-input:focus {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-focus);
}

.verification-code-input.error {
  border-color: var(--color-error);
  animation: shake var(--duration-fast) var(--ease-standard);
}

/* ============================================
   10. 发送验证码按钮
   ============================================ */

.send-code-wrapper {
  display: flex;
  gap: var(--space-2);
}

.send-code-wrapper .form-control {
  flex: 1;
}

.send-code-btn {
  flex-shrink: 0;
  min-width: 120px;
  white-space: nowrap;
}

.send-code-btn:disabled {
  background: var(--bg-secondary);
  color: var(--text-tertiary);
  cursor: not-allowed;
}

/* ============================================
   11. 分割线
   ============================================ */

.divider {
  display: flex;
  align-items: center;
  text-align: center;
  margin: var(--space-6) 0;
  color: var(--text-secondary);
  font-size: var(--font-size-sm);
}

.divider::before,
.divider::after {
  content: '';
  flex: 1;
  border-bottom: 1px solid var(--border-secondary);
}

.divider span {
  padding: 0 var(--space-4);
}

/* ============================================
   12. 页脚链接
   ============================================ */

.auth-footer {
  margin-top: var(--space-6);
  text-align: center;
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
}

.auth-footer a {
  color: var(--color-link);
  text-decoration: none;
  font-weight: var(--font-weight-medium);
  transition: var(--transition-fast);
}

.auth-footer a:hover {
  text-decoration: underline;
  color: var(--color-primary-hover);
}

.auth-footer a:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* ============================================
   13. 社交登录按钮
   ============================================ */

.social-login {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  margin-top: var(--space-6);
}

.social-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
  width: 100%;
  height: var(--button-height-lg);
  padding: 0 var(--space-6);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  color: var(--text-primary);
  background: var(--bg-primary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: var(--transition-fast);
}

.social-btn:hover {
  background: var(--bg-hover);
  box-shadow: var(--shadow-hover);
}

.social-btn:active {
  transform: scale(0.98);
}

.social-btn img {
  width: 20px;
  height: 20px;
}

/* ============================================
   14. 加载状态
   ============================================ */

.btn .spinner {
  display: none;
  width: 16px;
  height: 16px;
  border: 2px solid var(--text-inverse);
  border-top-color: transparent;
  border-radius: var(--radius-full);
  animation: spin 0.8s linear infinite;
}

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

.btn.loading .btn-text {
  display: none;
}

/* ============================================
   15. 响应式设计
   ============================================ */

@media (max-width: 768px) {
  .auth-container {
    padding: var(--space-4);
  }
  
  .auth-card {
    padding: var(--space-8);
  }
  
  .auth-title {
    font-size: var(--font-size-lg);
  }
  
  .verification-code-input {
    width: 40px;
    height: 48px;
    font-size: var(--font-size-md);
  }
}

@media (max-width: 480px) {
  .auth-card {
    padding: var(--space-6);
  }
  
  .send-code-wrapper {
    flex-direction: column;
  }
  
  .send-code-btn {
    width: 100%;
  }
  
  .verification-code-wrapper {
    gap: var(--space-2);
  }
  
  .verification-code-input {
    width: 36px;
    height: 44px;
  }
}

/* ============================================
   16. 打印样式
   ============================================ */

@media print {
  .auth-container {
    background: white;
  }
  
  .auth-card {
    box-shadow: none;
    border: 1px solid var(--border-primary);
  }
  
  .password-toggle,
  .social-login {
    display: none;
  }
}

/* ============================================
   17. 可访问性增强
   ============================================ */

.form-control:focus-visible,
.password-toggle:focus-visible,
.social-btn:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* 高对比度模式 */
@media (prefers-contrast: high) {
  .auth-card {
    border: 2px solid var(--border-primary);
  }
  
  .form-control {
    border-width: 2px;
  }
}

/* 减少动画 */
@media (prefers-reduced-motion: reduce) {
  .auth-card,
  .auth-logo {
    animation: none;
  }
  
  .verification-code-input.error {
    animation: none;
  }
}