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

:root {
    --text: #1e1e1e;
    --primary: #d5d5d5;
    --secondary: #e7e1e1;
    --highlight: #f2eded;
    --thumb-background: #ffffff;
    --hover-shadow: 0 0 0 2px rgba(30, 30, 30, 0.1);
}

body[data-theme="dark"] {
    --text: #eeeeee;
    --primary: #5b6268;
    --secondary: #292e33;
    --highlight: #3a4147;
    --thumb-background: #454c52;
    --hover-shadow: 0 0 0 2px rgb(255 255 255 / 15%);
}

body {
    background-color: var(--secondary);
    color: var(--text);
    font-family: Verdana, Geneva, Tahoma, sans-serif;
    transition: background-color 200ms ease;
}

.gallery-container {
    display:grid;
    margin: 20px auto;
    padding: 20px;
    width: 52%;
    max-width: 1200px;
    grid-template-columns: repeat(5, 1fr);
    gap: 10px;
    background-color: var(--highlight);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

.main-display {
    grid-column: 1 / -1;
    display: grid;
    grid-template-rows: auto auto;
    width: 100%;
    margin-top: 10px;
    overflow: hidden;
    border: 1px solid var(--primary);
}

.main-display img {
    display: block;
    width: 100%;
    height: auto;
}

.main-display figcaption {
    padding: 0.6rem 1rem;
    background: var(--secondary);
    color: var(--text);
    font-size: 1rem;
    text-align: center;
}

.thumbnail-grid {
    display: grid;
    grid-column: 1 / -1;
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 0.75rem;
}

.thumb {
    display: block;
    height: 165px;
    margin-bottom: 10px;
    padding: 0;
    overflow: hidden;
    border: 1px solid var(--primary);
    border-radius: 4px;
    background: var(--thumb-background);
    cursor: pointer;
    transition: transform 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

.thumb:hover,
.thumb:focus-visible {
    transform: translateY(-3px);
    border-color: var(--text);
    box-shadow: var(--hover-shadow);
}

.thumb img {
    display: block;
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.color-picker {
    grid-column: 1 / -1;
    padding: 1rem;
    background: var(--secondary);
    text-align: center;
}

.color-picker h2 {
    margin-bottom: 0.75rem;
    color: var(--text);
    font-size: 1.1rem;
}

.color-buttons {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.6rem;
}

.color-buttons button {
    padding: 0.55rem 1rem;
    border: 1px solid var(--primary);
    border-radius: 4px;
    background: var(--highlight);
    color: var(--text);
    font: inherit;
    cursor: pointer;
}

.color-buttons button:hover,
.color-buttons button:focus-visible {
    border-color: var(--text);
    box-shadow: var(--hover-shadow);
}

footer {
    grid-column: 1 / -1;
    width: calc(100% + 40px);
    height: 80px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    margin-left: -20px;
    margin-right: -20px;
    margin-bottom: -20px;
    background-color: var(--secondary);
    color: var(--text);
    padding: 0 20px;
    font-size: 0.875rem;
    border-top: 2px solid var(--primary);
}

footer p {
    margin-bottom: 5px;
}

footer a {
    display: inline-block;
    color: var(--text);
}

@media (max-width: 700px) {
    .gallery-container {
        width: 94%;
    }

    .thumbnail-grid {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }
}