/* ====================
   认证页面样式 - 登录/注册
   ==================== */

.auth-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-xl);
  position: relative;
}

/* 背景装饰 */
.auth-bg-decoration {
  position: fixed;
  width: 600px;
  height: 600px;
  border-radius: 50%;
  filter: blur(120px);
  opacity: 0.15;
  pointer-events: none;
}

.auth-bg-decoration.top {
  top: -200px;
  right: -200px;
  background: var(--primary-color);
}

.auth-bg-decoration.bottom {
  bottom: -200px;
  left: -200px;
  background: var(--neon-purple);
}

/* 认证容器 */
.auth-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  max-width: 1000px;
  width: 100%;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-card);
}

/* 左侧品牌区 */
.auth-brand {
  background: var(--primary-gradient);
  padding: var(--spacing-2xl);
  display: flex;
  flex-direction: column;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.auth-brand::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.1'%3E%3Cpath d='m36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
  opacity: 0.3;
}

.auth-brand-content {
  position: relative;
  z-index: 1;
}

.auth-brand-logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-xl);
}

.auth-brand-logo .logo-icon {
  width: 60px;
  height: 60px;
  background: rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
}

.auth-brand-logo h1 {
  font-size: 1.8rem;
  font-weight: 700;
  color: white;
}

.auth-brand h2 {
  font-size: 2rem;
  font-weight: 700;
  color: white;
  margin-bottom: var(--spacing-md);
  line-height: 1.3;
}

.auth-brand p {
  color: rgba(255, 255, 255, 0.8);
  font-size: 1.1rem;
  line-height: 1.6;
}

.auth-features {
  margin-top: var(--spacing-xl);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.auth-feature {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  color: white;
}

.auth-feature-icon {
  width: 40px;
  height: 40px;
  background: rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
}

.auth-feature span {
  font-size: 0.95rem;
}

/* 右侧表单区 */
.auth-form-section {
  padding: var(--spacing-2xl);
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.auth-form-header {
  margin-bottom: var(--spacing-xl);
}

.auth-form-header h2 {
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--spacing-sm);
}

.auth-form-header p {
  color: var(--text-muted);
}

/* 表单样式 */
.auth-form {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.form-label {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
}

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

.form-input {
  width: 100%;
  padding: var(--spacing-md);
  padding-left: 45px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 1rem;
  transition: all 0.3s ease;
}

.form-input:focus {
  outline: none;
  border-color: var(--primary-color);
  background: rgba(var(--primary-rgb), 0.08);
  box-shadow: 0 0 0 3px rgba(var(--primary-rgb), 0.16);
}

.form-input::placeholder {
  color: var(--text-muted);
}

.form-input-icon {
  position: absolute;
  left: 15px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  transition: color 0.3s ease;
}

.form-input:focus + .form-input-icon,
.form-input-wrapper:focus-within .form-input-icon {
  color: var(--primary-color);
}

.password-toggle {
  position: absolute;
  right: 15px;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 5px;
  transition: color 0.3s ease;
}

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

/* 复选框 */
.form-checkbox {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

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

.form-checkbox label {
  font-size: 0.9rem;
  color: var(--text-secondary);
  cursor: pointer;
}

.form-checkbox a {
  color: var(--primary-color);
  text-decoration: none;
}

.form-checkbox a:hover {
  text-decoration: underline;
}

/* 表单链接 */
.form-links {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.form-link {
  color: var(--primary-color);
  text-decoration: none;
  font-size: 0.9rem;
  transition: opacity 0.3s ease;
}

.form-link:hover {
  opacity: 0.8;
}

/* 提交按钮 */
.btn-submit {
  width: 100%;
  padding: var(--spacing-md);
  font-size: 1rem;
  margin-top: var(--spacing-sm);
}

/* 分隔线 */
.auth-divider {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  color: var(--text-muted);
  font-size: 0.85rem;
}

.auth-divider::before,
.auth-divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--border-color);
}

/* 社交登录 */
.social-login {
  display: flex;
  gap: var(--spacing-md);
}

.btn-social {
  flex: 1;
  padding: var(--spacing-md);
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 1.2rem;
  cursor: pointer;
  transition: all 0.3s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
}

.btn-social:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: var(--primary-color);
}

.btn-social.github:hover {
  border-color: #fff;
}

.btn-social.google:hover {
  border-color: #ea4335;
}

/* 切换表单链接 */
.auth-switch {
  text-align: center;
  margin-top: var(--spacing-lg);
  color: var(--text-muted);
  font-size: 0.9rem;
}

.auth-switch a {
  color: var(--primary-color);
  text-decoration: none;
  font-weight: 600;
}

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

/* 返回首页 */
.back-home {
  position: absolute;
  top: var(--spacing-xl);
  left: var(--spacing-xl);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.9rem;
  transition: color 0.3s ease;
}

.back-home:hover {
  color: var(--primary-color);
}

/* 表单错误提示 */
.form-error {
  color: var(--neon-pink);
  font-size: 0.85rem;
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.form-input.error {
  border-color: var(--neon-pink);
}

/* 成功提示 */
.form-success {
  background: rgba(var(--success-rgb), 0.10);
  border: 1px solid rgba(var(--success-rgb), 0.22);
  color: var(--neon-green);
  padding: var(--spacing-md);
  border-radius: var(--radius-md);
  text-align: center;
  font-size: 0.9rem;
}

/* 响应式 */
@media (max-width: 768px) {
  .auth-container {
    grid-template-columns: 1fr;
    max-width: 450px;
  }

  .auth-brand {
    display: none;
  }

  .auth-form-section {
    padding: var(--spacing-xl);
  }

  .social-login {
    flex-direction: column;
  }

  .back-home {
    position: relative;
    top: 0;
    left: 0;
    margin-bottom: var(--spacing-lg);
  }
}

/* AI 偏好选择（注册时） */
.ai-preferences {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-sm);
}

.ai-pref-item {
  padding: var(--spacing-sm) var(--spacing-md);
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  text-align: center;
  cursor: pointer;
  transition: all 0.3s ease;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.ai-pref-item:hover {
  border-color: var(--primary-color);
  background: rgba(var(--primary-rgb), 0.10);
}

.ai-pref-item.selected {
  border-color: var(--primary-color);
  background: rgba(var(--primary-rgb), 0.16);
  color: var(--text-primary);
}

.ai-pref-item .icon {
  display: block;
  font-size: 1.5rem;
  margin-bottom: var(--spacing-xs);
}