:root {
    --bg: #f5f5f7;
    --surface: #fff;
    --border: #ddd;
    --text: #111;
    --text-secondary: #444;
    --accent: #00857e;
    --radius-card: 10px;
    --dropdown-shadow: 0 4px 20px rgba(0,0,0,0.2);
    view-transition-name: none;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg: #111;
        --surface: #1c1c1c;
        --border: #2a2a2a;
        --text: #f5f5f5;
        --text-secondary: #a3a3a3;
    }
}

*, *::before, *::after {
    box-sizing: border-box;
}

:focus-visible {
    outline: 4px solid color-mix(var(--accent) 50%, transparent);
    outline-offset: -1px;
}

body {
    font-family: Gill Sans, sans-serif;
    font-size: 18px;
    margin: 0;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
}

/* ── Header ───────────────────────────────────────── */

.header-brand {
    display: flex;
    align-items: center;
    gap: .5em;
    font-size: 2em;
    font-weight: 600;
    letter-spacing: -0.5px;
    color: var(--accent);
    text-decoration: none;
    flex-shrink: 0;
}

.header-brand img {
    width: 1.25em;
}

/* ── Toolbar ──────────────────────────────────── */

header,
aside {
    display: flex;
    align-items: center;
    gap: 3.75em;
    background-color: color-mix(var(--accent) 10%, var(--bg));
    z-index: 90;
    padding: 2em 0;
}

header {
    padding-bottom: 1em;
}

aside {
    position: sticky;
    top: 0;
    view-transition-name: toolbar;
}

.control-group {
    display: flex;
    align-items: center;
    gap: .75em;
}

.select-label {
    color: var(--text-secondary);
    white-space: nowrap;
}

.spacer {
    flex: 1;
}

/* ── Grid ────────────────────────────────────────── */

figure {
    margin: 0;
}

main {
    padding: 20px;
    display: grid;
    display: grid-lanes;
    grid-template-columns: repeat(auto-fill, minmax(15rem, 1fr));
    gap: 20px;
}

/* ── Cards ───────────────────────────────────────── */

.card {
    cursor: pointer;
    border-radius: var(--radius-card);
    overflow: hidden;
    position: relative;
    background: var(--surface);
    view-transition-name: match-element;
}

main img {
    width: 100%;
    height: auto;
    display: block;
    transition: transform 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.card:hover img {
    transform: scale(1.04);
}

/* Dialog */

dialog {
    background-color: transparent;
    border: none;
    justify-content: start;
    gap: .5em;
}

dialog:open {
    display: flex;
    outline: none;
}

dialog::backdrop {
    background-color: rgba(0,0,0,0.5);
}

dialog img {
    object-fit: contain;
    max-width: 100%;
    max-height: 100%;
}