/* ============================================================
   RESPONSIVE – 1024px (Tablet Landscape)
============================================================ */
@media (max-width: 1024px) {
    .header-inner {
        padding: 0 20px;
    }

    .nav-link {
        font-size: 12px;
        padding: 8px 8px;
    }

    .hero-section {
        height: auto;
        padding: 60px 0;
    }

    .hero-inner {
        height: auto;
    }

    .hero-title {
        font-size: 34px;
    }

    .stats-grid {
        flex-wrap: wrap;
        gap: 16px;
    }

    .stat-item {
        flex: 0 0 calc(50% - 12px);
        border-right: none;
        border-bottom: 1px solid #eee;
    }

    .stat-item:nth-child(odd) {
        border-right: 1px solid #eee;
    }

    .stat-item:last-child {
        border-bottom: none;
        border-right: none;
    }

    .mission-grid,
    .values-grid,
    .principles-grid {
        flex-wrap: wrap;
    }

    .mission-card,
    .value-card,
    .principle-card {
        flex: 0 0 calc(50% - 0px);
    }

    /* mission card tablet: 2 cột dùng border-right + border-bottom */
    .mission-card {
        border-right: none;
        border-bottom: 1px solid #e8e5dc;
    }

    .mission-card:nth-child(odd) {
        border-right: 1px solid #e8e5dc;
    }

    .mission-card:last-child,
    .mission-card:nth-last-child(2):nth-child(odd) {
        border-bottom: none;
    }

    /* value card tablet: 2 cột dùng border-right + border-bottom vàng mờ */
    .value-card {
        border-right: none;
        border-bottom: 1px solid rgba(255, 255, 255, 0.15);
    }

    .value-card:nth-child(odd) {
        border-right: 1px solid rgba(255, 255, 255, 0.15);
    }

    .value-card:last-child,
    .value-card:nth-last-child(2):nth-child(odd) {
        border-bottom: none;
    }

    .timeline-line {
        display: none;
    }

    .timeline-items {
        flex-wrap: wrap;
        gap: 24px;
    }

    .timeline-item {
        flex: 0 0 calc(50% - 12px);
    }

    .footer-inner {
        flex-direction: column;
        gap: 32px;
    }

    .footer-brand {
        flex: none;
    }

    .footer-cols {
        flex-wrap: wrap;
        gap: 24px;
    }

    .footer-col {
        flex: 0 0 calc(50% - 12px);
    }
}

/* ============================================================
   RESPONSIVE – 768px (Tablet Portrait)
============================================================ */
@media (max-width: 768px) {

    /* Header */
    .header-nav {
        display: none;
    }

    .btn-cta {
        display: none;
    }

    .mobile-toggle {
        display: flex;
    }

    /* Hero */
    .hero-section {
        height: auto;
        padding: 50px 0;
    }

    .hero-inner {
        padding: 0 24px;
        height: auto;
    }

    .hero-title br, .hero-desc br {
        display: none;
    }

    .hero-title {
        font-size: 28px;
    }

    /* Stats */
    .stat-item {
        flex: 0 0 calc(50% - 8px);
    }

    /* Sections */
    .section-title {
        font-size: 26px;
    }

    /* Timeline */
    .timeline-item {
        flex: 0 0 100%;
    }

    /* CTA */
    .cta-title {
        font-size: 26px;
    }

    /* Footer */
    .footer-col {
        flex: 0 0 100%;
    }
}

/* ============================================================
   RESPONSIVE – 480px (Mobile)
============================================================ */
@media (max-width: 480px) {
    .header-inner {
        padding: 0 16px;
    }

    .logo-name {
        font-size: 16px;
        letter-spacing: 2px;
    }

    .logo-tagline {
        font-size: 6px;
        letter-spacing: 1px;
    }

    .hero-section {
        height: auto;
        padding: 40px 0;
    }

    .hero-title {
        font-size: 24px;
    }

    .hero-desc {
        font-size: 13px;
    }

    .stats-grid {
        gap: 12px;
    }

    .stat-item {
        flex: 0 0 100%;
        border-right: none;
        border-bottom: 1px solid #eee;
    }

    .stat-item:last-child {
        border-bottom: none;
    }

    .mission-card,
    .value-card,
    .principle-card {
        flex: 0 0 100%;
    }

    /* mission card: đổi sang border-bottom khi stack dọc */
    .mission-card {
        border-right: none;
        border-bottom: 1px solid #e8e5dc;
    }

    .mission-card:last-child {
        border-bottom: none;
    }

    .section-title {
        font-size: 22px;
    }

    .cta-title {
        font-size: 22px;
    }

    .btn-cta-gold {
        font-size: 12px;
        padding: 12px 24px;
    }

    .footer-inner {
        gap: 24px;
    }

    .footer-cols {
        gap: 20px;
    }
}