/**
 * ====================================================================
 * RESPONSIVE.CSS - Tối Ưu Hiển Thị Cho Mobile / Tablet Chuẩn Đẹp
 * ====================================================================
 */

@media (max-width: 992px) {
    .features-grid-4 {
        grid-template-columns: repeat(2, 1fr);
        gap: 18px;
    }

    .steps-grid-3 {
        grid-template-columns: 1fr;
        gap: 18px;
    }
}

@media (max-width: 768px) {
    .container {
        padding: 0 16px;
    }

    .nav-content {
        flex-direction: row;
        height: auto;
        padding-top: 10px;
        padding-bottom: 10px;
        flex-wrap: wrap;
        gap: 10px;
    }

    .nav-links {
        order: 3;
        width: 100%;
        overflow-x: auto;
        padding-bottom: 4px;
        gap: 4px;
        -webkit-overflow-scrolling: touch;
    }

    .nav-item {
        font-size: 12.5px;
        padding: 6px 10px;
        white-space: nowrap;
    }

    .hero-navy-section {
        padding: 26px 0 32px 0;
    }

    .hero-top-badge {
        font-size: 11.5px;
        padding: 5px 12px;
        margin-bottom: 14px;
    }

    .hero-headline {
        font-size: 22px;
        padding: 0 6px;
        margin-bottom: 12px;
    }

    .hero-description {
        font-size: 13.5px;
        margin-bottom: 22px;
        padding: 0 4px;
    }

    .tempmail-card {
        padding: 18px 16px;
        border-radius: 12px;
    }

    .card-meta-row {
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;
        margin-bottom: 12px;
    }

    .email-input-group {
        flex-direction: column;
        gap: 10px;
    }

    .email-field-wrapper {
        width: 100%;
        height: 44px;
    }

    .email-text-box {
        font-size: 15px;
        text-align: center;
    }

    .email-card-actions {
        width: 100%;
        display: grid;
        grid-template-columns: 1fr 1fr 1fr;
        gap: 6px;
    }

    .btn-copy-outline, .btn-qr-outline, .btn-access-dark {
        height: 40px;
        padding: 0 8px;
        font-size: 12.5px;
        justify-content: center;
    }

    .card-features-bar {
        flex-wrap: wrap;
        gap: 12px 18px;
        justify-content: center;
    }

    .feature-tag {
        font-size: 11.5px;
    }

    /* ACTION PILLS ON MOBILE */
    .action-bar-section {
        padding: 18px 0 14px 0;
    }

    .action-pills-row {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 8px;
    }

    .pill-btn {
        width: 100%;
        justify-content: center;
        font-size: 12.5px;
        height: 38px;
        padding: 0 10px;
    }

    /* INBOX ON MOBILE */
    .inbox-card-header {
        flex-direction: column;
        align-items: stretch;
        gap: 12px;
        padding: 14px 16px;
    }

    .inbox-header-left {
        justify-content: space-between;
    }

    .inbox-search-box {
        max-width: 100%;
    }

    .inbox-header-right {
        justify-content: flex-end;
    }

    .mail-row {
        grid-template-columns: 36px 1fr auto;
        grid-template-areas: 
            "avatar sender time"
            "avatar subject subject";
        row-gap: 4px;
        column-gap: 10px;
        padding: 12px 14px;
    }

    .mail-avatar-col {
        grid-area: avatar;
        align-self: start;
        margin-top: 2px;
    }

    .mail-sender-col {
        grid-area: sender;
        padding-right: 0;
    }

    .mail-time-col {
        grid-area: time;
    }

    .mail-subject-col {
        grid-area: subject;
        padding-right: 0;
    }

    /* CONTENT SECTIONS */
    .features-section, .how-it-works-section, .faq-section {
        padding: 44px 0;
    }

    .main-heading {
        font-size: 22px;
    }

    .features-grid-4 {
        grid-template-columns: 1fr;
        gap: 14px;
    }

    .feature-card {
        padding: 20px 18px;
    }

    .step-card {
        padding: 22px 18px;
    }

    .faq-question {
        padding: 14px 16px;
        font-size: 14px;
    }

    .faq-answer {
        padding: 0 16px;
    }

    .faq-item.active .faq-answer {
        padding: 0 16px 16px 16px;
    }

    /* MODALS */
    .tmailor-modal-card {
        max-height: 92vh;
        border-radius: 12px;
    }

    .mail-viewer-toolbar {
        flex-direction: column;
        align-items: stretch;
        gap: 8px;
        padding: 10px 16px;
    }

    .toolbar-left, .toolbar-right {
        justify-content: center;
        width: 100%;
    }

    .tool-btn, .tool-action-btn {
        flex: 1;
        text-align: center;
        justify-content: center;
    }

    .footer-row {
        flex-direction: column;
        text-align: center;
        gap: 14px;
    }

    .footer-col-right {
        justify-content: center;
        flex-wrap: wrap;
    }
}

@media (max-width: 480px) {
    .brand-name {
        font-size: 15px;
    }

    .btn-signin-red {
        padding: 6px 12px;
        font-size: 12px;
    }

    .email-card-actions {
        grid-template-columns: 1fr;
    }

    .btn-copy-outline, .btn-qr-outline, .btn-access-dark {
        height: 38px;
    }

    .action-pills-row {
        grid-template-columns: 1fr;
    }

    .modal-bottom {
        flex-direction: column;
        align-items: stretch;
    }

    .btn-modal-danger {
        margin-right: 0;
        margin-bottom: 6px;
        width: 100%;
        text-align: center;
    }

    .btn-modal-primary, .btn-modal-ghost {
        width: 100%;
        text-align: center;
    }
}