/* 登录页面专用样式 */
.login-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 20px;
}

.login-card {
    background: rgba(255, 255, 255, 0.9);
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    width: 100%;
    max-width: 450px;
    overflow: hidden;
    transition: all 0.3s ease;
    animation: fadeIn 0.8s ease-in-out;
}

.login-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.3);
}

.login-header {
    background: linear-gradient(135deg, #4e73df 0%, #224abe 100%);
    color: white;
    padding: 25px 20px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.login-header::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255,255,255,0.2) 0%, rgba(255,255,255,0) 80%);
    transform: rotate(30deg);
    z-index: 1;
}

.login-title {
    position: relative;
    z-index: 2;
    margin: 0;
    font-weight: 600;
    letter-spacing: 1px;
    font-size: 1.5rem;
}

.login-form {
    padding: 10px 0;
}

.login-form .form-control {
    border-radius: 8px;
    padding: 12px 15px;
    border: 1px solid #dce1f0;
    background-color: #f8f9fc;
    transition: all 0.3s;
}

.login-form .form-control:focus {
    border-color: #4e73df;
    box-shadow: 0 0 0 0.2rem rgba(78, 115, 223, 0.25);
    background-color: #fff;
}

.login-form .form-label {
    font-weight: 500;
    color: #5a5c69;
    margin-bottom: 8px;
}

.login-form .btn-primary {
    padding: 12px;
    font-weight: 600;
    letter-spacing: 0.5px;
    border-radius: 8px;
    background: linear-gradient(135deg, #4e73df 0%, #224abe 100%);
    border: none;
    box-shadow: 0 4px 15px rgba(78, 115, 223, 0.4);
    transition: all 0.3s;
    margin-top: 10px;
}

.login-form .btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 18px rgba(78, 115, 223, 0.5);
    background: linear-gradient(135deg, #3a5fc8 0%, #1a3ea0 100%);
}

.login-form .btn-primary:active {
    transform: translateY(0);
    box-shadow: 0 2px 8px rgba(78, 115, 223, 0.4);
}

.login-form .form-check-label {
    color: #6e707e;
    font-size: 0.9rem;
}

.login-form .form-check-input:checked {
    background-color: #4e73df;
    border-color: #4e73df;
}

.alert {
    border-radius: 8px;
    padding: 12px 15px;
    margin-bottom: 20px;
    border: none;
    font-weight: 500;
}

.alert-danger {
    background-color: #fde8e7;
    color: #d52a1a;
    border-left: 4px solid #e74a3b;
}

.alert-success {
    background-color: #e6f8f3;
    color: #17a673;
    border-left: 4px solid #1cc88a;
}

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

/* 响应式调整 */
@media (max-width: 576px) {
    .login-card {
        border-radius: 10px;
    }
    
    .login-header {
        padding: 20px 15px;
    }
    
    .login-title {
        font-size: 1.3rem;
    }
    
    .login-form .form-control {
        padding: 10px 12px;
    }
    
    .login-form .btn-primary {
        padding: 10px;
    }
}