/* ============== Smartphone =================== */
@media (max-width: 767px) {
    .optech-content h1 {
        font-size: 36px;
    }
    .optech-hero-section .optech-btn {
        justify-content: center;
        margin-top: 30px;
    }
    .optech-thumb-position,
    .optech-shape1,
    .optech-shape2 {
        display: none;
    }
    .optech-thumb {
        margin-left: 0 !important;
        margin-bottom: 40px !important;
    }
    .optech-default-content h2 {
        font-size: 34px !important;
    }
    .h2,
    h2 {
        font-size: 34px;
        letter-spacing: -0.01em;
    }
    .optech-cta-content h2 {
        font-size: 36px !important;
    }
    .optech-footer-menu {
        margin-bottom: 35px;
    }
    .optech-footer-title h5 {
        margin-bottom: 15px;
    }
    .optech-footer-menu.dark-color ul li a {
        font-size: 18px !important;
    }
}
@media (max-width: 991px) {
    .header-bottom {
        padding: 20px 0;
        margin-top: 20px;
    }
    .header_bottom .nav_item {
        display: none;
    }
    .picture {
        margin-top: 40px;
        text-align: center;
    }
    .optech-content h1 {
        font-size: 48px !important;
        letter-spacing: -0.02em;
    }
    .optech-hero-section .optech-btn {
        justify-content: center;
        margin-top: 30px;
    }
    .optech-shape1,
    .optech-shape2 {
        display: none;
    }
    .optech-default-content h2 {
        margin-top: 130px;
        font-size: 40px !important;
    }
    .large-padding-tb {
        padding: 100px 0;
    }
    #slider .slide-item {
        width: 314px;
    }
    #slider #gallery {
        justify-content: center;
    }
}
@media (max-width: 1200px) {
    .header_bottom .nav_item {
        display: none;
    }
}