@media (max-width: 480px) {
    .nav-grid {
        grid-template-columns: 1fr;
    }
    
    .site-logo {
        flex-direction: column;
        text-align: center;
    }
    
    .header {
        padding: 1.5rem 1rem;
    }
}

.fa-globe, .fa-box, .fa-cloud, 
.fa-database, .fa-code, .fa-chart-line {
    font-family: "Font Awesome 5 Free";
    font-weight: 900;
}
/* 瀵艰埅鍗＄墖鍩虹鏍峰紡 */
.nav-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
    padding: 2rem;
}

.nav-card {
    position: relative;
    border-radius: 12px;
    padding: 1.5rem;
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    color: white;
    overflow: hidden;
    transition: transform 0.3s ease;
    min-height: 180px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.nav-card:hover {
    transform: translateY(-5px);
}

/* 涓嶅悓鏍峰紡鍙樹綋 */
.nav-card.style1 {
    background: linear-gradient(135deg, #2c83fa, #00c3ff);
}
.nav-card.style2 {
    background: linear-gradient(135deg, #ff6b6b, #ff9f43);
}
.nav-card.style3 {
    background: linear-gradient(135deg, #5f27cd, #341f97);
}
.nav-card.style4 {
    background: linear-gradient(135deg, #1dd1a1, #10ac84);
}

.nav-icon {
    font-size: 2rem;
    margin-bottom: 1rem;
}

.nav-title {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.nav-meta {
    display: flex;
    justify-content: space-between;
    font-size: 0.9rem;
    opacity: 0.9;
}

.nav-desc {
    font-size: 0.95rem;
    margin-top: 1rem;
    opacity: 0.9;
    line-height: 1.4;
}

.nav-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 1;
}

/* 鍔ㄧ敾鏁堟灉 */
@keyframes cardEntrance {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.nav-card {
    animation: cardEntrance 0.5s ease forwards;
    opacity: 0;
}

/* 鍝嶅簲寮忚皟鏁� */
@media (max-width: 768px) {
    .nav-grid {
        grid-template-columns: 1fr;
    }
}