:root {
    color-scheme: light;
    --background: #f3f3f3;
    --paper: #fff;
    --ink: #202020;
    --red: #b91c1c;
    --border: #c4c4c4;
    --selection-background: #fef3c7;
    --selection-border: #a16207;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    background: var(--background);
    color: var(--ink);
    font-family: system-ui, sans-serif;
    line-height: 1.5;
}

main {
    max-width: 1120px;
    margin: 0 auto;
    padding: 24px 16px 40px;
}

h1 {
    margin: 0;
    font-size: 1.75rem;
}

.controls {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin: 24px 0;
}

button {
    padding: 8px 12px;
    border: 1px solid var(--border);
    border-radius: 6px;
    background: var(--paper);
    color: var(--ink);
    font: inherit;
    cursor: pointer;
}

button:hover {
    border-color: var(--ink);
}

button:focus-visible {
    outline: 3px solid var(--ink);
    outline-offset: 3px;
}

.deck,
.hand {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(72px, 1fr));
    gap: 12px;
}

.hand {
    max-width: 440px;
}

playing-card {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    aspect-ratio: 5 / 7;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--paper);
    box-shadow: 0 2px 3px #00000014;
    font-family: Georgia, serif;
}

playing-card.heart,
playing-card.diamond {
    color: var(--red);
}

.rank {
    position: absolute;
    top: 6px;
    left: 8px;
    font-size: 1.125rem;
    font-weight: 700;
    line-height: 1;
}

.suit {
    font-size: 2.25rem;
    line-height: 1;
}

playing-card.selected {
    background: var(--selection-background);
    border-color: var(--selection-border);
    outline: 3px solid var(--selection-border);
    outline-offset: 2px;
    box-shadow: 0 4px 8px #00000026;
}