:root {
    --bg-color: #121212;
    --text-color: #ffffff;
    --accent-color: #4CAF50;
    --card-bg: #1e1e1e;
    --border-color: #333333;
}

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

body {
    font-family: 'Pretendard', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
}

header {
    background-color: var(--card-bg);
    padding: 4rem 1rem 3rem;
    text-align: center;
    border-bottom: 1px solid var(--border-color);
}

header h1 {
    font-size: 2.8rem;
    margin-bottom: 0.5rem;
    letter-spacing: -0.02em;
}

header p {
    color: #aaaaaa;
    margin-bottom: 2rem;
    font-size: 1.1rem;
}

.filters {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 12px;
}

.filter-btn {
    background-color: transparent;
    border: 1px solid #555;
    color: #dddddd;
    padding: 10px 24px;
    border-radius: 30px;
    cursor: pointer;
    font-size: 0.95rem;
    transition: all 0.3s ease;
}

.filter-btn:hover {
    border-color: #ffffff;
    color: #ffffff;
}

.filter-btn.active {
    background-color: #ffffff;
    color: #000000;
    border-color: #ffffff;
    font-weight: bold;
}

.gallery-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 24px;
    padding: 3rem 2rem;
    max-width: 1400px;
    margin: 0 auto;
}

.gallery-item {
    background-color: var(--card-bg);
    border-radius: 12px;
    overflow: hidden;
    cursor: pointer;
    border: 1px solid var(--border-color);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.gallery-item:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 24px rgba(0,0,0,0.4);
}

.gallery-item img {
    width: 100%;
    height: 260px;
    object-fit: cover;
    display: block;
    transition: transform 0.5s ease;
}

.gallery-item:hover img {
    transform: scale(1.05);
}

.item-info {
    padding: 18px;
    text-align: center;
    font-size: 1rem;
    color: #e0e0e0;
    background-color: var(--card-bg);
    position: relative;
    z-index: 2;
}

/* Lightbox Modal */
.lightbox {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.95);
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.lightbox.show {
    display: flex;
    opacity: 1;
}

.lightbox-content {
    max-width: 90%;
    max-height: 90vh;
    border-radius: 8px;
    box-shadow: 0 0 30px rgba(0,0,0,0.8);
    object-fit: contain;
}

.close {
    position: absolute;
    top: 25px;
    right: 40px;
    color: #ffffff;
    font-size: 48px;
    font-weight: 300;
    cursor: pointer;
    transition: color 0.2s;
    line-height: 1;
}

.close:hover {
    color: #aaaaaa;
}

footer {
    text-align: center;
    padding: 3rem;
    color: #666666;
    border-top: 1px solid var(--border-color);
    margin-top: 2rem;
}

@media (max-width: 768px) {
    header h1 {
        font-size: 2.2rem;
    }
    .gallery-container {
        grid-template-columns: repeat(auto-fill, minmax(100%, 1fr));
        padding: 2rem 1rem;
    }
    .close {
        top: 15px;
        right: 20px;
        font-size: 40px;
    }
}