:root {
        --ok: #2ecc71;
        --bad: #e74c3c;
        --neutral: #f3f5f7;
        --ink: #1f2a37;
        --muted: #6b7280;
        --border: #d1d5db;
        --btn: #ffffff;
        --btnHover: #f9fafb;
    }

    body {
        font-family: system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
        margin: 18px;
        color: var(--ink);
        background: #fff;
    }

    h1 {
        font-size: 18px;
        margin: 0 0 10px;
    }

    .topbar {
        display: flex;
        gap: 10px;
        flex-wrap: wrap;
        align-items: center;
        margin-bottom: 12px;
    }

    .card {
        position: sticky;
        top: 0;
        z-index: 1000;
        background: #fff;
    }

    .field {
        display: flex;
        gap: 8px;
        align-items: center;
        flex-wrap: wrap;
    }

    input[type="text"] {
        padding: 8px 10px;
        border-radius: 10px;
        border: 1px solid var(--border);
        min-width: 320px;
        font-size: 14px;
        text-transform: uppercase;
    }

    button {
        padding: 8px 10px;
        border-radius: 10px;
        border: 1px solid var(--border);
        background: var(--btn);
        cursor: pointer;
        font-size: 14px;
    }

    button:hover {
        background: var(--btnHover);
    }

    button:disabled {
        opacity: 0.6;
        cursor: not-allowed;
    }

    .status {
        display: flex;
        gap: 12px;
        flex-wrap: wrap;
        align-items: center;
        margin-top: 10px;
        color: var(--muted);
        font-size: 14px;
    }

    .pill {
        display: inline-flex;
        align-items: center;
        gap: 8px;
        padding: 6px 10px;
        border-radius: 999px;
        background: var(--neutral);
        border: 1px solid var(--border);
        color: var(--ink);
        font-variant-numeric: tabular-nums;
    }

    /* Grid of tasks */
    .grid {
        display: grid;
        gap: 8px;
        margin-top: 12px;
    }

    .row {
        display: grid;
        grid-template-columns: 74px 1fr;
        gap: 10px;
        align-items: center;
        border: 1px solid var(--border);
        border-radius: 12px;
        padding: 10px;
        background: #fff;
        transition: background 120ms ease, border-color 120ms ease;
    }

    .row.ok {
        background: rgba(46, 204, 113, 0.12);
        border-color: rgba(46, 204, 113, 0.5);
    }

    .row.bad {
        background: rgba(231, 76, 60, 0.12);
        border-color: rgba(231, 76, 60, 0.5);
    }

    .label {
        font-weight: 700;
        font-variant-numeric: tabular-nums;
    }

    .choices {
        display: grid;
        grid-template-columns: repeat(5, minmax(44px, 1fr));
        gap: 8px;
    }

    .choice {
        text-align: center;
        user-select: none;
        padding: 10px 0;
        border-radius: 10px;
        border: 1px solid var(--border);
        background: #fff;
        font-weight: 650;
    }

    .choice:hover {
        background: var(--btnHover);
    }

    .choice:disabled {
        opacity: .55;
    }

    .hint {
        margin-top: 8px;
        color: var(--muted);
        font-size: 13px;
    }

    .choice.correct {
        background: #2ecc71;
        border-color: #27ae60;
        color: #fff;
    }

    .choice.wrong {
        background: #e74c3c;
        border-color: #c0392b;
        color: #fff;
    }

    .big {
        font-size: 16px;
        font-weight: 800;
    }