/* 登录页面样式 - 修正版 */
.login-container {
    min-height: 100vh;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.login-box {
    background: white;
    border-radius: 15px;
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.1);
    padding: 40px;
    width: 100%;
    max-width: 400px;
    position: relative;
    overflow: hidden;
}

.login-box::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.login-header {
    text-align: center;
    margin-bottom: 30px;
}

.login-header .logo {
    max-width: 200px;
    margin-bottom: 15px;
    border-radius: 8px;
}

.login-header .logo-placeholder {
    margin-bottom: 15px;
    color: #667eea;
}

.login-header h1 {
    color: #333;
    margin-bottom: 5px;
    font-size: 1.8rem;
    font-weight: 600;
}

.login-header p {
    color: #666;
    margin: 0;
    font-size: 0.9rem;
}

.login-form .form-label {
    font-weight: 500;
    color: #333;
    margin-bottom: 0.5rem;
}

.login-form .form-control {
    height: 50px;
    padding: 10px 15px;
    border: 2px solid #e1e5e9;
    border-radius: 8px;
    font-size: 16px;
    transition: all 0.3s;
}

.login-form .form-control:focus {
    border-color: #667eea;
    box-shadow: 0 0 0 0.2rem rgba(102, 126, 234, 0.25);
}

.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border: none;
    color: white;
    font-size: 16px;
    font-weight: 600;
    border-radius: 8px;
    transition: all 0.3s;
    height: 50px;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
}

.login-footer {
    text-align: center;
    margin-top: 30px;
    padding-top: 20px;
    border-top: 1px solid #eee;
    color: #666;
    font-size: 14px;
}

.alert {
    border-radius: 8px;
    border: none;
    padding: 12px 15px;
    margin-bottom: 20px;
}

.alert-danger {
    background-color: #f8d7da;
    color: #721c24;
}

/* 响应式设计 */
@media (max-width: 480px) {
    .login-box {
        padding: 30px 20px;
        margin: 10px;
    }
    
    .login-header h1 {
        font-size: 1.5rem;
    }
    
    .login-form .form-control {
        height: 45px;
        font-size: 14px;
    }
    
    .btn-primary {
        height: 45px;
        font-size: 14px;
    }
}

/* 加载动画 */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.login-box {
    animation: fadeIn 0.5s ease-out;
}