:root {
    --bg: #0c0f14;
    --text: #e2e8f0;
    --text-muted: #94a3b8;
    --accent: #8b9cfb;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family:
        system-ui,
        -apple-system,
        BlinkMacSystemFont,
        "Segoe UI",
        sans-serif;
    background: var(--bg);
    color: var(--text);
}

body.noscroll {
    overflow: hidden;
    touch-action: none; /* Prevents touch scrolling on mobile */
}

header {
    text-align: center;
    padding: 1.5rem 1rem 1rem;
}

h1 {
    margin: 0;
    font-size: 26px;
}

a.back {
    display: inline-block;
    margin-top: 0.4rem;
    font-size: 0.9rem;
    color: var(--text-muted);
    text-decoration: none;
}

main {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem;
}

.grid {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 0.2rem;
}

.grid-item {
    aspect-ratio: 1 / 1;
    overflow: hidden;
}

.grid-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    cursor: pointer;
    display: block;
}

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

.modal.open {
    display: flex;
}

.modal img {
    max-width: 90vw;
    max-height: 90vh;
    object-fit: contain;
}

.modal .close {
    position: absolute;
    top: 20px;
    right: 30px;
    font-size: 32px;
    color: #fff;
    cursor: pointer;
}

.nav {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    font-size: 2.4rem;
    background: rgba(0, 0, 0, 0.35);
    border: none;
    color: #fff;
    cursor: pointer;

    /* Bigger touch target */
    padding: 1.2rem; /* increase clickable area */
    width: 3.5rem; /* ensure a minimum hitbox size */
    height: 3.5rem;
    display: flex;
    align-items: center;
    justify-content: center;

    touch-action: manipulation;
}

.nav.prev {
    left: 20px;
}
.nav.next {
    right: 20px;
}