* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: Pretendard, sans-serif;
    background: #111;
    color: #fff;
}

/* HEADER */
.header {
    padding: 20px;
    background: #000;
    position: sticky;
    top: 0;
    z-index: 10;
}

.header h1 {
    margin: 0 0 10px;
    font-size: 22px;
}

/* DAY TABS */
.day-tabs {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.day-tabs button {
    background: #333;
    border: none;
    color: #fff;
    padding: 8px 14px;
    border-radius: 20px;
    cursor: pointer;
}

.day-tabs button.active {
    background: #fff;
    color: #000;
    font-weight: bold;
}

/* SECTIONS */
.day-section {
    display: none;
    padding: 20px;
}

.day-section.active {
    display: block;
}

/* GALLERY */
.gallery {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: 10px;
}

.item {
    position: relative;
}

/* THUMB */
.thumb {
    width: 100%;
    border-radius: 8px;
    cursor: pointer;
    display: block;
}

/* VIDEO */
.video-thumb-wrapper {
    position: relative;
}

.video-thumb-wrapper::after {
    content: '';
    position: absolute;
    inset: 0;
    background: rgba(0,0,0,0.3);
    border-radius: 8px;
}

.play-icon {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 40px;
    color: white;
    pointer-events: none;
    text-shadow: 0 0 15px rgba(0,0,0,0.7);
}

/* MODAL */
#modal {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.9);
    z-index: 100;
    justify-content: center;
    align-items: center;
}

#modal img,
#modal video {
    max-width: 95%;
    max-height: 95%;
}