/* 认证页面布局 */
.auth-section {
    position: relative;
    min-height: 100vh;
    background: var(--gradient-primary);
    color: var(--white-color);
    overflow: hidden;
    padding: 20px 0 2rem 0; /* 使用固定像素值，确保足够间距 */
}

/* 认证页面容器 */
.auth-section .row {
    min-height: calc(100vh - 152px); /* 120px顶部 + 32px底部 */
}

/* 认证页面导航栏样式覆盖 - 使用页面特定样式 */
.auth-page .navbar {
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.98) 0%, rgba(248, 249, 250, 0.95) 100%) !important; /* 微妙的渐变背景 */
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1); /* 更强的阴影 */
    backdrop-filter: blur(20px); /* 更强的模糊效果 */
    border-bottom: 1px solid rgba(0, 0, 0, 0.05); /* 添加底部边框 */
}

.auth-page .navbar.scrolled {
    background: linear-gradient(180deg, rgba(255, 255, 255, 1) 0%, rgba(248, 249, 250, 0.98) 100%) !important;
    box-shadow: 0 4px 25px rgba(0, 0, 0, 0.15);
}

.auth-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
}

.auth-shapes {
    position: relative;
    width: 100%;
    height: 100%;
}

.auth-shapes .shape {
    position: absolute;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
}

.auth-shapes .shape-1 {
    width: 120px;
    height: 120px;
    top: 10%;
    right: 15%;
    background: rgba(255, 255, 255, 0.08);
}

.auth-shapes .shape-2 {
    width: 200px;
    height: 200px;
    bottom: 15%;
    left: 10%;
    background: rgba(255, 255, 255, 0.06);
}

.auth-shapes .shape-3 {
    width: 80px;
    height: 80px;
    top: 40%;
    left: 20%;
    background: rgba(255, 255, 255, 0.04);
}

/* 认证卡片 */
.auth-card {
    background: var(--white-color);
    color: var(--dark-color);
    border-radius: var(--border-radius-xl);
    padding: 2.5rem;
    box-shadow: var(--shadow-xl), 0 -10px 30px rgba(0, 0, 0, 0.15); /* 增强阴影效果 */
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    position: relative;
    z-index: 2;
    max-width: 100%;
    margin: 20px auto 0 auto; /* 增加顶部margin */
}

/* 认证头部 */
.auth-header {
    text-align: center;
    margin-bottom: 2rem;
}

.auth-logo {
    margin-bottom: 1.5rem;
}

.auth-logo .logo {
    height: 60px;
    max-width: 200px;
}

.auth-title {
    font-size: 2rem;
    font-weight: var(--font-weight-bold);
    color: var(--dark-color);
    margin-bottom: 0.5rem;
}

.auth-subtitle {
    color: var(--gray-color);
    font-size: 1rem;
    margin-bottom: 0;
}

/* 认证表单 */
.auth-form {
    width: 100%;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-label {
    display: flex;
    align-items: center;
    font-weight: var(--font-weight-medium);
    color: var(--dark-color);
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
}

.form-label i {
    margin-right: 0.5rem;
    color: var(--primary-color);
    width: 16px;
    text-align: center;
}

.form-label .optional {
    color: var(--gray-color);
    font-weight: var(--font-weight-normal);
    font-size: 0.8rem;
}

.form-control {
    width: 100%;
    padding: 0.875rem 1rem;
    border: 2px solid var(--gray-light);
    border-radius: var(--border-radius-md);
    font-size: 1rem;
    line-height: 1.5;
    color: var(--dark-color);
    background-color: var(--white-color);
    transition: all var(--transition-normal) ease;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.2rem rgba(102, 126, 234, 0.25);
}

.form-control.is-valid {
    border-color: var(--success-color);
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 8 8'%3e%3cpath fill='%2328a745' d='m2.3 6.73.8-.77 1.5 1.5 3.2-3.2.8.77L2.3 6.73z'/%3e%3c/svg%3e");
    background-repeat: no-repeat;
    background-position: right calc(0.375em + 0.1875rem) center;
    background-size: calc(0.75em + 0.375rem) calc(0.75em + 0.375rem);
}

.form-control.is-invalid {
    border-color: var(--danger-color);
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 12 12' width='12' height='12' fill='none' stroke='%23dc3545'%3e%3ccircle cx='6' cy='6' r='4.5'/%3e%3cpath d='m6 3v2.5'/%3e%3cpath d='m6 8.5v.5'/%3e%3c/svg%3e");
    background-repeat: no-repeat;
    background-position: right calc(0.375em + 0.1875rem) center;
    background-size: calc(0.75em + 0.375rem) calc(0.75em + 0.375rem);
}

.form-control::placeholder {
    color: var(--gray-color);
    opacity: 0.8;
}

/* 输入组样式 */
.input-group {
    display: flex;
    width: 100%;
}

.input-group .form-control {
    flex: 1;
    border-top-right-radius: 0;
    border-bottom-right-radius: 0;
    border-right: none;
}

.input-group .btn {
    border-top-left-radius: 0;
    border-bottom-left-radius: 0;
    white-space: nowrap;
    min-width: 120px;
}

.input-group .form-control:focus {
    z-index: 2;
}

.input-group .btn:focus {
    z-index: 3;
}

/* 密码输入组 */
.password-input {
    position: relative;
    display: flex;
    align-items: center;
}

.password-toggle {
    position: absolute;
    right: 12px;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: var(--gray-color);
    cursor: pointer;
    padding: 0.25rem;
    border-radius: var(--border-radius-sm);
    transition: all var(--transition-fast) ease;
    z-index: 3;
}

.password-toggle:hover {
    color: var(--primary-color);
    background: rgba(102, 126, 234, 0.1);
}

.password-toggle:focus {
    outline: none;
    color: var(--primary-color);
}

/* 密码强度指示器 */
.password-strength {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-top: 0.5rem;
}

.strength-bar {
    flex: 1;
    height: 4px;
    background: var(--gray-light);
    border-radius: 2px;
    overflow: hidden;
}

.strength-fill {
    height: 100%;
    border-radius: 2px;
    transition: all var(--transition-normal) ease;
    width: 0%;
}

.strength-fill.weak {
    background: var(--danger-color);
}

.strength-fill.fair {
    background: var(--warning-color);
}

.strength-fill.good {
    background: var(--info-color);
}

.strength-fill.strong {
    background: var(--success-color);
}

.strength-text {
    font-size: 0.8rem;
    color: var(--gray-color);
    white-space: nowrap;
}

/* 表单反馈 */
.form-feedback {
    font-size: 0.875rem;
    margin-top: 0.25rem;
}

.valid-feedback {
    color: var(--success-color);
}

.invalid-feedback {
    color: var(--danger-color);
}

.form-hint {
    display: block;
    margin-top: 0.25rem;
    font-size: 0.8rem;
    color: var(--gray-color);
    line-height: 1.4;
}

/* 表单选项 */
.form-options {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.form-check {
    display: flex;
    align-items: center;
}

.form-check-input {
    width: 1.2rem;
    height: 1.2rem;
    margin-right: 0.5rem;
    border: 2px solid var(--gray-color);
    border-radius: var(--border-radius-sm);
    cursor: pointer;
}

.form-check-input:checked {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
}

.form-check-label {
    font-size: 0.9rem;
    color: var(--dark-color);
    cursor: pointer;
    user-select: none;
}

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

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

.forgot-link {
    color: var(--primary-color);
    text-decoration: none;
    font-size: 0.9rem;
    transition: all var(--transition-fast) ease;
}

.forgot-link:hover {
    color: var(--primary-dark);
    text-decoration: underline;
}

/* 复选框组 */
.form-check-group {
    margin-bottom: 1.5rem;
}

.form-check-group .form-check {
    margin-bottom: 0.75rem;
}

.form-check-group .form-check:last-child {
    margin-bottom: 0;
}

/* 提交按钮 */
.auth-submit {
    position: relative;
    overflow: hidden;
    font-weight: var(--font-weight-bold);
    margin-bottom: 1.5rem;
}

.auth-submit:disabled {
    opacity: 0.8;
    cursor: not-allowed;
}

.btn-loading {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* 分割线 */
.auth-divider {
    text-align: center;
    margin: 1.5rem 0;
    position: relative;
}

.auth-divider::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 0;
    right: 0;
    height: 1px;
    background: var(--gray-light);
}

.auth-divider span {
    background: var(--white-color);
    padding: 0 1rem;
    color: var(--gray-color);
    font-size: 0.9rem;
    position: relative;
    z-index: 1;
}

/* 社交登录 */
.social-login {
    display: flex;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.btn-social {
    flex: 1;
    padding: 0.75rem;
    border: 2px solid var(--gray-light);
    background: var(--white-color);
    color: var(--dark-color);
    border-radius: var(--border-radius-md);
    font-weight: var(--font-weight-medium);
    transition: all var(--transition-normal) ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.btn-social:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-social.btn-google:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.btn-social.btn-github:hover {
    border-color: var(--primary-dark);
    color: var(--primary-dark);
}

.btn-social i {
    font-size: 1.1rem;
}

/* 认证页脚 */
.auth-footer {
    text-align: center;
    margin-top: 1rem;
}

.auth-footer p {
    margin: 0;
    color: var(--gray-color);
    font-size: 0.9rem;
}

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

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

/* 认证提醒 - 改进样式 */
.auth-alert {
    margin-bottom: 1.5rem;
    border-radius: var(--border-radius-md);
    padding: 1rem 1.25rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    border: none;
    font-weight: var(--font-weight-medium);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    animation: slideInDown 0.3s ease-out;
    position: relative;
    overflow: hidden;
}

.auth-alert::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: currentColor;
}

.auth-alert i {
    font-size: 1.2rem;
    opacity: 0.9;
}

.auth-alert .btn-close {
    margin-left: auto;
    padding: 0.25rem;
    background: none;
    border: none;
    opacity: 0.6;
    transition: opacity 0.2s ease;
    cursor: pointer;
}

.auth-alert .btn-close:hover {
    opacity: 1;
}

/* 不同类型的提醒样式 */
.auth-alert.alert-success {
    background: linear-gradient(135deg, rgba(14, 131, 69, 0.1) 0%, rgba(14, 131, 69, 0.05) 100%);
    color: var(--success-color);
    border: 1px solid rgba(14, 131, 69, 0.2);
}

.auth-alert.alert-danger {
    background: linear-gradient(135deg, rgba(236, 83, 69, 0.1) 0%, rgba(236, 83, 69, 0.05) 100%);
    color: var(--danger-color);
    border: 1px solid rgba(236, 83, 69, 0.2);
}

.auth-alert.alert-info {
    background: linear-gradient(135deg, rgba(22, 150, 210, 0.1) 0%, rgba(22, 150, 210, 0.05) 100%);
    color: var(--info-color);
    border: 1px solid rgba(22, 150, 210, 0.2);
}

.auth-alert.alert-warning {
    background: linear-gradient(135deg, rgba(253, 191, 17, 0.1) 0%, rgba(253, 191, 17, 0.05) 100%);
    color: var(--warning-color);
    border: 1px solid rgba(253, 191, 17, 0.2);
}

/* 消息弹出动画 */
@keyframes slideInDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideOutUp {
    from {
        opacity: 1;
        transform: translateY(0);
    }
    to {
        opacity: 0;
        transform: translateY(-20px);
    }
}

/* 响应式设计 */
@media (max-width: 768px) {
    .auth-section {
        padding: 20px 0 1rem 0; /* 移动端也需要足够的顶部padding */
    }
    
    .auth-section .row {
        min-height: calc(100vh - 116px); /* 100px顶部 + 16px底部 */
    }
    
    .auth-card {
        padding: 2rem 1.5rem;
        margin: 1rem;
        border-radius: var(--border-radius-lg);
    }
    
    .auth-title {
        font-size: 1.75rem;
    }
    
    .auth-logo .logo {
        height: 50px;
    }
    
    .form-options {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.75rem;
    }
    
    .social-login {
        flex-direction: column;
        gap: 0.75rem;
    }
    
    .password-strength {
        flex-direction: column;
        gap: 0.5rem;
        align-items: flex-start;
    }
    
    .strength-bar {
        width: 100%;
    }
}

@media (max-width: 576px) {
    .auth-card {
        padding: 1.5rem 1rem;
    }
    
    .auth-title {
        font-size: 1.5rem;
    }
    
    .form-control {
        padding: 0.75rem;
        font-size: 0.9rem;
    }
    
    .btn-lg {
        padding: 0.875rem 1.5rem;
        font-size: 1rem;
    }
}

/* 动画增强 */
.auth-card {
    animation: slideInUp 0.6s ease-out;
}

@keyframes slideInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 输入框焦点动画已移除，避免跳动效果 */

/* 可访问性 */
@media (prefers-reduced-motion: reduce) {
    .auth-card,
    .form-control,
    .btn-social {
        animation: none;
        transition: none;
    }
    
    .auth-shapes .shape {
        animation: none;
    }
}

/* 高对比度模式 */
@media (prefers-contrast: high) {
    .form-control {
        border-width: 3px;
    }
    
    .btn-social {
        border-width: 3px;
    }
    
    .form-control:focus {
        box-shadow: 0 0 0 0.25rem rgba(102, 126, 234, 0.5);
    }
}