body {
    margin: 0;
    padding: 8px;
    font-family: Arial, Helvetica, sans-serif;
    background: aliceblue;
}

h2 {
    text-align: center;
    margin: 4px 0 8px;
    color: #1a1a1a;
    font-size: 1.3rem;
}

#controls {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
    gap: 12px;
    margin-bottom: 10px;
    padding: 6px 10px;
    background: #f0f4f8;
    border-radius: 6px;
    font-size: 0.85rem;
}

#controls label {
    font-weight: bold;
}

#controls select {
    padding: 3px 6px;
    font-size: 0.85rem;
    border-radius: 4px;
    border: 1px solid #aaa;
}

#toggle-btn {
    padding: 4px 12px;
    font-size: 0.82rem;
    border: 1px solid #888;
    border-radius: 4px;
    background: #fff;
    cursor: pointer;
}

#toggle-btn:hover {
    background: #e8e8e8;
}

#main-layout {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
    justify-content: center;
    align-items: flex-start;
}

/* Punnett Square */
#punnett-container {
    min-width: 0;
}

#punnett-table {
    border-collapse: collapse;
    width: 100%;
    table-layout: fixed;
}

#punnett-table th,
#punnett-table td {
    border: 1px solid #888;
    text-align: center;
    padding: 6px 4px;
    font-size: 0.82rem;
    height: 38px;
    transition: background 0.3s;
    min-width: 0;
}

#punnett-table th {
    background: #e8eef4;
    font-weight: bold;
}

#punnett-table td {
    cursor: pointer;
}

#punnett-table td.highlighted {
    outline: 3px solid #333;
    outline-offset: -2px;
    z-index: 1;
    position: relative;
}

.corner-cell {
    background: #d0d8e0 !important;
}

/* Chart */
#chart-container {
    min-width: 0;
    position: relative;
}

#chart-container canvas {
    width: 100% !important;
}

/* Summary */
#summary {
    text-align: center;
    font-size: 0.88rem;
    margin-top: 8px;
    padding: 5px;
    background: #f8f8f0;
    border-radius: 4px;
    border: 1px solid #ddd;
}

#summary strong {
    color: #2c3e50;
}

#return-link {
    display: none;
    padding: 8px 16px;
}