/* =============================================================================
   12. FOOTER - Chân trang (thiết kế lại không có ảnh background)
   ============================================================================= */
.site-footer {
    background: linear-gradient(135deg, #2c3e50 0%, #34495e 100%);
    color: white;
    padding: 60px 0 30px;
    margin-top: 80px;
}

.footer-content-container {
    max-width: 80%;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xl);
    padding: 0 var(--spacing-lg);
}

.footer-column h4 {
    color: white;
    font-size: 1.2em;
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-sm);
    border-bottom: 2px solid rgba(255, 255, 255, 0.3);
}

.footer-column ul li {
    margin-bottom: 12px;
    font-size: 0.95em;
}

.footer-column a {
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.footer-column a:hover {
    color: white;
    transform: translateX(5px);
}

.footer-column i {
    color: #0099ff;
}

/* Social Media Icons (mới) */
.footer-social-links {
    display: flex;
    gap: 15px;
    margin-top: var(--spacing-md);
}

.social-icon-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 45px;
    height: 45px;
    border-radius: 50%;
    background: #ffffff1a;
    color: #0099ff;
    font-size: 1.3em;
    transition: all 0.3s ease;
}

.social-icon-link:hover {
    background: var(--color-primary);
    transform: translateY(-5px) scale(1.1);
    box-shadow: 0 10px 25px rgba(0, 123, 255, 0.4);
}

.social-icon-link.facebook:hover {
    background: #1877f2;
}

.social-icon-link.tiktok:hover {
    background: #000000;
}

.social-icon-link.zalo:hover {
    background: #0068ff;
}

/* Footer Bottom */
.footer-bottom {
    text-align: center;
    margin-top: 40px;
    padding-top: 20px;
    border-top: 1px solid rgba(255, 255, 255, 0.2);
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.9em;
}

/* =============================================================================
   RESPONSIVE FOOTER STYLES
   ============================================================================= */

/* Desktop (≥ 1024px) */
@media (min-width: 1024px) {
    .site-footer {
        padding-top: 250px;
        padding-bottom: 50px;
    }

    .site-footer::before {
        height: 500px;
        background-size: contain;
        background-position: center top;
    }

    .footer-content-container {
        grid-template-columns: repeat(4, 1fr);
        gap: 20px;
    }

    .footer-column h4 {
        font-size: 1.2em;
    }
}

/* Tablet (≤ 768px) */
@media (max-width: 768px) {
    .site-footer {
        padding: 30px 15px;
    }
    
    .footer-content-container {
        grid-template-columns: 1fr;
        gap: 25px;
    }
}

/* Small Mobile (≤ 480px) */
@media (max-width: 480px) {
    .site-footer {
        padding: 25px 10px;
    }
}

/* Large Desktop (≥ 1200px) */
@media (min-width: 1200px) {
    .footer-content-container {
        grid-template-columns: repeat(4, 1fr);
    }
}