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

:root {
    --ink: #333333;
    --ink-soft: #555;
    --ink-faint: #8a8a8a;
    --line: #eaeaea;
    --sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

html, body {
    height: 100%;
}

body {
    font-family: var(--sans);
    color: var(--ink);
    background: #ffffff;
}

img {
    -webkit-user-drag: none;
    user-select: none;
}

/* Header */
.header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 26px 4%;
    border-bottom: 1px solid var(--line);
}

.site-title {
    font-size: 0.82rem;
    font-weight: 700;
    letter-spacing: 3px;
    text-transform: uppercase;
    color: var(--ink);
}

.tabs {
    display: flex;
    gap: 28px;
}

.tab-btn {
    background: none;
    border: none;
    font-family: var(--sans);
    font-size: 0.82rem;
    letter-spacing: 0.5px;
    color: var(--ink-faint);
    cursor: pointer;
    padding: 4px 0;
    border-bottom: 2px solid transparent;
    transition: color 0.18s ease, border-color 0.18s ease;
}

.tab-btn:hover {
    color: var(--ink);
}

.tab-btn.active {
    color: var(--ink);
    border-bottom-color: var(--ink);
}

/* Masonry grid */
.grid {
    column-count: 4;
    column-gap: 4px;
    padding: 4px;
}

.grid-item {
    break-inside: avoid;
    margin-bottom: 4px;
    display: block;
}

.grid-item.is-hidden {
    display: none;
}

.grid-item img {
    width: 100%;
    display: block;
    cursor: zoom-in;
    transition: opacity 0.2s ease;
}

.grid-item img:hover {
    opacity: 0.92;
}

.empty-state {
    padding: 120px 20px;
    text-align: center;
    color: var(--ink-faint);
    font-size: 0.9rem;
}

/* Lightbox */
.lightbox {
    position: fixed;
    inset: 0;
    background: rgba(20, 20, 20, 0.86);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.25s ease;
    z-index: 1000;
    padding: 30px;
}

.lightbox.open {
    opacity: 1;
    pointer-events: auto;
}

.lightbox img {
    max-width: 90vw;
    max-height: 90vh;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.5);
    cursor: default;
}

.lightbox-close {
    position: absolute;
    top: 22px;
    right: 28px;
    font-size: 1.6rem;
    color: #ffffff;
    background: none;
    border: none;
    cursor: pointer;
    opacity: 0.8;
    transition: opacity 0.18s ease;
}

.lightbox-close:hover {
    opacity: 1;
}

/* Responsive */
@media (max-width: 1100px) {
    .grid {
        column-count: 3;
    }
}

@media (max-width: 720px) {
    .grid {
        column-count: 2;
    }

    .header {
        padding: 20px 5%;
    }
}

@media (max-width: 420px) {
    .grid {
        column-count: 1;
    }
}