body {
    background: linear-gradient(120deg, #a1c4fd 0%, #c2e9fb 100%);
}

.card {
    border: none;
    border-radius: 15px;
    backdrop-filter: blur(10px);
    background-color: rgba(255, 255, 255, 0.9);
}

.card-body {
    padding: 2rem !important;
}

.form-control {
    border-radius: 10px;
    padding: 0.75rem 1rem;
}

.form-control:focus {
    box-shadow: 0 0 0 0.25rem rgba(13, 110, 253, 0.15);
}

.btn-primary {
    border-radius: 10px;
    padding: 0.75rem 1rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(13, 110, 253, 0.15);
}

/* 添加响应式阴影效果 */
@media (max-width: 768px) {
    .card {
        margin: 1rem;
    }
}

/* 添加加载动画 */
.btn-primary.loading {
    position: relative;
    pointer-events: none;
    opacity: 0.8;
}

.btn-primary.loading:after {
    content: '';
    position: absolute;
    width: 1rem;
    height: 1rem;
    top: 50%;
    left: 50%;
    margin-top: -0.5rem;
    margin-left: -0.5rem;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: #fff;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}