.intro_section {
    margin-top: clamp(60px, 7vh, 80px);
    width: 100%;
    height: calc(100vh - clamp(60px, 7vh, 80px));
    min-height: 750px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: linear-gradient(180deg, #FFF -1.73%, #C2CDE9 39%, #8CA1D5 65.83%, #758DCC 81.45%);
    overflow: hidden;
}

.busLine_logo {
    margin-top: clamp(20px, 1.3vw, 30px);
    width: clamp(67px, 4.4vw, 101px);
}

.intro_section__subTitle {
    margin: clamp(22px, 1.4vw, 32px) 0 clamp(8px, 0.5vw, 12px);
    text-align: center;
    color: #212121;
    font-style: normal;
    font-weight: 400;
    line-height: 134%;
}

.intro_section__title {
    text-align: center;
    color: #000A4C;
    font-style: normal;
    font-weight: 600;
    line-height: 140%;
}

.mobile-only {
    display: none;
}

.screen_area {
    margin-bottom: clamp(20px, 1.3vw, 30px);
    display: flex;
    align-items: center;
    gap: clamp(61px, 4vw, 91px);
}

.screen_thumbnails {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: clamp(34px, 2.2vw, 50px);
    flex-shrink: 0;
    width: clamp(670px, 43.8vw, 1004px); /* gap + screen_thum.active *2 + clamp(10px, 0.7vw, 16px)*/
    opacity: 0;
    visibility: hidden;
}

.screen_thumb {
    margin: 0 auto;
    width: clamp(313px, 20.5vw, 469px);
    height: clamp(176px, 11.6vw, 266px); /* clamp(166px, 10.9vw, 250px) + clamp(10px, 0.7vw, 16px)*/
    align-content: center;
    cursor: pointer;
    transition: width 0.5s ease, height 0.5s ease, opacity 0.5s ease, box-shadow 0.5s ease;
}
.screen_thumb.inactive {
    width: clamp(282px, 18.5vw, 422px);
    opacity: 0.6;
}
.screen_thumb.active {
    width: clamp(313px, 20.5vw, 469px);
    opacity: 1;
}

.screen_thumb img {
    border-radius: clamp(5px, 0.3vw, 7px);
    width: 100%;
    object-fit: cover;
    display: block;
    box-shadow: 3px 5px 12px 0 rgba(57, 69, 92, 0.25);
}

  /* 모니터 영역 */
.monitor_wrapper {
    flex-shrink: 0;
    position: relative;
    width: clamp(510px, 33.5vw, 766px);
    aspect-ratio: 319/287;
}

.monitor_wrapper img.monitor_screen {
    width: 100%;
    transition: opacity 0.6s ease;
}
.monitor_wrapper img.monitor_screen.visible {
    opacity: 1;
}
.monitor_wrapper img.monitor_screen.hidden {
    opacity: 0;
}


/* 모바일 환경 최적화 */
@media (max-width: 1300px) {
    .intro_section {
        height: auto;
    }

    .mobile-only {
        display: block;
    }

    .screen_area {
        margin-top: clamp(32px, 2.1vw, 48px);
        flex-direction: column;
        gap: clamp(20px, 1.3vw, 30px);
    }
}

@media (max-width: 767px) {
    .screen_thumbnails {
        display: none;
    }

    .monitor_wrapper {
        max-width: 88vw;
    }
}