/* 自定义工具类 */
.text-shadow {
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}
.gradient-bg {
    background: linear-gradient(135deg, #0078d7 0%, #005a9e 100%);
}
.card-hover {
    transition: all 0.3s ease;
}
.card-hover:hover {
    transform: translateY(-5px);
}
.btn-primary {
    background: linear-gradient(135deg, #e60012 0%, #c5000f 100%);
    transition: all 0.3s ease;
}
.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(230, 0, 18, 0.3);
}
.btn-secondary {
    background: linear-gradient(135deg, #ff6b00 0%, #e55e00 100%);
    transition: all 0.3s ease;
}
.btn-secondary:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(255, 107, 0, 0.3);
}
.nav-bottom {
    box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.1);
}