/* ============================================
   深算AI - 响应式样式
   ============================================ */

/* --- Tablet (≤1024px) --- */
@media (max-width: 1024px) {
    .product-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .card-featured {
        grid-column: span 2;
    }

    .values-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .contact-inner {
        flex-direction: column;
        align-items: flex-start;
    }

    .contact-panel {
        width: 100%;
    }
}

/* --- Mobile Large (≤768px) --- */
@media (max-width: 768px) {
    .nav-menu,
    .nav-cta {
        display: none;
    }

    .nav-toggle {
        display: flex;
    }

    /* Mobile nav open state */
    .navbar.nav-open .nav-menu {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 64px;
        left: 0;
        right: 0;
        background: rgba(9,9,11,0.98);
        backdrop-filter: blur(20px);
        -webkit-backdrop-filter: blur(20px);
        border-bottom: 1px solid var(--border);
        padding: 1rem;
        gap: 0.25rem;
    }

    .navbar.nav-open .nav-menu a {
        padding: 0.75rem 1rem;
    }

    .hero {
        padding: 100px 1.5rem 60px;
    }

    .hero-glow {
        width: 500px;
        height: 400px;
    }

    .hero-title {
        font-size: 2.25rem;
    }

    .hero-desc {
        font-size: 1rem;
    }

    .hero-actions {
        flex-direction: column;
        align-items: center;
    }

    .hero-stats {
        gap: 1.5rem;
    }

    .stat-num {
        font-size: 1.25rem;
    }

    .products,
    .about,
    .contact {
        padding: 5rem 0;
    }

    .product-grid {
        grid-template-columns: 1fr;
    }

    .card-featured {
        grid-column: span 1;
    }

    .values-grid {
        grid-template-columns: 1fr;
    }

    .section-title {
        font-size: 1.875rem;
    }

    .footer-inner {
        flex-direction: column;
        gap: 1.5rem;
        align-items: flex-start;
    }

    .footer-links {
        flex-wrap: wrap;
        gap: 1rem;
    }
}

/* --- Mobile Small (≤480px) --- */
@media (max-width: 480px) {
    .container {
        padding: 0 1rem;
    }

    .hero-title {
        font-size: 1.875rem;
    }

    .hero-badge {
        font-size: 0.75rem;
    }

    .hero-stats {
        flex-wrap: wrap;
        justify-content: center;
        gap: 1.25rem;
    }

    .stat-divider {
        display: none;
    }

    .btn {
        width: 100%;
        justify-content: center;
    }

    .product-card {
        padding: 1.25rem;
    }

    .value-card {
        padding: 1.5rem;
    }

    .contact-panel-inner {
        padding: 1.5rem 1.25rem;
    }
}