:root {
    --bg: #f4f6fb;
    --card: #ffffff;
    --text: #1f2937;
    --muted: #6b7280;
    --primary: #2563eb;
    --border: #d1d5db;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
}

.page {
    max-width: 900px;
    margin: 0 auto;
    padding: 16px;
}

.card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 16px;
    margin-bottom: 16px;
}

.hidden {
    display: none;
}

.review-box {
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 12px;
    margin-bottom: 12px;
    background: white;
}

label {
    display: block;
    margin-bottom: 10px;
}

input,
select,
textarea {
    width: 100%;
    padding: 8px;
    margin-top: 4px;
}

button {
    padding: 10px 14px;
    border: 0;
    border-radius: 6px;
    background: var(--primary);
    color: white;
    cursor: pointer;
}

.buttonRow {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.bigResult {
    font-size: 28px;
    font-weight: bold;
}

.smallResult {
    color: var(--muted);
    margin-bottom: 12px;
}

/* NFR2: mobile first, then adapt on wider screens */
@media (min-width: 768px) {
    .twoCols {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 12px;
    }
}