@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+KR:wght@300;400;500;700&display=swap');

:root {
    --primary-color: #ffffff;
    --background-color: #121212;
    --card-background: #1e1e1e;
    --text-color: #e0e0e0;
    --accent-color: #03dac6;
    --shadow-color: rgba(0, 0, 0, 0.5);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Noto Sans KR', sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ====================================== Preloader ===================================== */
#loader-wrapper {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1000;
    background: var(--background-color);
}

/* ▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼ */
/* 요청사항 반영 수정된 부분 */
#loader {
    display: block;
    position: absolute;
    left: 50%;
    top: 50%;
    width: 100%;
    /* 화면 너비의 80%로 설정 */
    max-width: 900px;
    /* 너무 큰 화면에서 과도하게 커지는 것을 방지 */
    transform: translate(-50%, -50%);
    /* 정확한 중앙 정렬 */
    z-index: 1001;
}

.pre-load {
    /* SVG가 부모(#loader)의 크기에 맞춰 자동으로 조절되도록 설정 */
    width: 100%;
    height: auto;
    font-size: 60px;
    font-weight: bold;
    fill: var(--accent-color);
    text-transform: uppercase;
}

/* ▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲ */

/* ====================================== Social Links ===================================== */
slink {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 999;
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.social_link img {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.social_link img:hover {
    transform: scale(1.15);
    box-shadow: 0 0 15px var(--accent-color);
}


/* ====================================== Main Container ===================================== */
.all_page {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    padding: 20px;
}

.cards_container {
    display: flex;
    gap: 20px;
    padding: 20px;
    width: 100%;
    max-width: 100vw;
    overflow-x: auto;
    overflow-y: hidden;
    -webkit-overflow-scrolling: touch;
    /* for smooth scrolling on iOS */
    scrollbar-width: none;
    /* for Firefox */
}

.cards_container::-webkit-scrollbar {
    display: none;
    /* for Chrome, Safari, and Opera */
}

.cards_container.active {
    cursor: grabbing;
    cursor: -webkit-grabbing;
}

/* ====================================== Card Section ===================================== */
.card_section {
    flex: 0 0 300px;
    /* 카드의 기본 너비 고정 */
    height: 533px;
    /* 480x854 비율 (300px 너비 기준) */
    position: relative;
    perspective: 1000px;
}

.card_inner {
    width: 100%;
    height: 100%;
    position: relative;
    border-radius: 20px;
    overflow: hidden;
    box-shadow: 0 10px 30px var(--shadow-color);
    transition: transform 0.4s ease, box-shadow 0.4s ease;
}

.card_section:hover .card_inner {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px var(--shadow-color);
}

.card_video {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    /* 영상이 컨테이너를 꽉 채우면서 비율 유지 */
    z-index: 1;
}

.card_content {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    padding: 20px;
    z-index: 2;
    background: linear-gradient(to top, rgba(0, 0, 0, 0.9), transparent);
    text-align: center;
}

.card_title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 15px;
    text-shadow: 2px 2px 10px rgba(0, 0, 0, 0.8);
}

.button-group {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.card_btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 20px;
    border: 1px solid var(--accent-color);
    background-color: transparent;
    color: var(--accent-color);
    font-size: 1rem;
    font-weight: 500;
    text-decoration: none;
    border-radius: 50px;
    cursor: pointer;
    transition: background-color 0.3s, color 0.3s, transform 0.3s;
}

.card_btn i {
    margin-right: 8px;
}

.card_btn:hover {
    background-color: var(--accent-color);
    color: var(--background-color);
    transform: scale(1.05);
}

.card_btn.download {
    background-color: var(--accent-color);
    color: var(--background-color);
}

.card_btn.download:hover {
    background-color: transparent;
    color: var(--accent-color);
}


.card_btn:disabled {
    background-color: #cccccc;
    color: #666666;
    border-color: #cccccc;
    cursor: not-allowed;
    transform: none;
}


/* ====================================== Overlay ===================================== */
.overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.9);
    z-index: 3;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 30px;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.4s ease, visibility 0.4s ease;
}

.overlay.active {
    opacity: 1;
    visibility: visible;
}

.overlay-content {
    text-align: left;
    max-height: 90%;
    overflow-y: auto;
    /* Firefox를 위한 스크롤바 숨기기 */
    scrollbar-width: none;
}

/* Chrome, Safari, Opera 등 Webkit 기반 브라우저를 위한 스crollbar 숨기기 */
.overlay-content::-webkit-scrollbar {
    display: none;
}

.overlay-content h3 {
    color: var(--accent-color);
    font-size: 1.8rem;
    margin-bottom: 15px;
    border-bottom: 2px solid var(--accent-color);
    padding-bottom: 10px;
}

.overlay-content p {
    margin-bottom: 12px;
    line-height: 1.7;
}

.overlay_close_btn {
    margin-top: 20px;
    padding: 10px 20px;
    background: var(--accent-color);
    color: var(--background-color);
    border: none;
    border-radius: 50px;
    cursor: pointer;
    font-weight: bold;
    transition: transform 0.3s;
}

.overlay_close_btn:hover {
    transform: scale(1.05);
}

/* ====================================== Media Queries (Responsive) ===================================== */

/* 모바일 화면 (768px 이하) */
@media (max-width: 768px) {
    slink {
        flex-direction: row;
        top: 15px;
        right: 50%;
        transform: translateX(50%);
        gap: 20px;
    }

    .all_page {
        padding: 80px 15px 20px 15px;
        /* slink 공간 확보 */
        align-items: flex-start;
    }

    .cards_container {
        flex-direction: column;
        align-items: center;
        overflow-x: hidden;
        overflow-y: auto;
        padding: 0;
        height: calc(100vh - 100px);
    }

    .card_section {
        flex: 0 0 auto;
        /* 높이가 콘텐츠에 맞게 자동 조절되도록 */
        width: 100%;
        max-width: 320px;
        /* 최대 너비 제한 */
        height: 568px;
        /* 480x854 비율 (320px 너비 기준) */
    }
}