.canvas-calc-box {
    max-width: 760px;
    padding: 18px;
    border: 1px solid #e2e2e2;
    border-radius: 12px;
    background-color: #FFF5E4;
    box-sizing: border-box;
}

.canvas-calc-box h2 {
    margin: 0 0 10px 0;
    font-size: 24px;
}

.canvas-calc-intro {
    margin: 0 0 14px 0;
    line-height: 1.5;
}

.canvas-calc-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 10px 14px;
}

.canvas-calc-field label {
    display: block;
    margin-bottom: 4px;
    font-size: 14px;
    font-weight: 600;
}

.canvas-calc-field input,
.canvas-calc-field select {
    width: 100%;
    height: 36px;
    padding: 6px 8px;
    border: 1px solid #cfcfcf;
    border-radius: 6px;
    box-sizing: border-box;
    font-size: 14px;
}

.canvas-calc-buttons {
    display: flex;
    gap: 8px;
    margin-top: 14px;
}

.canvas-calc-buttons button {
    height: 36px;
    padding: 0 16px;
    border: 1px solid #bdbdbd;
    border-radius: 6px;
    cursor: pointer;
    font-size: 14px;
}

#canvasCalcBtn {
    font-weight: 700;
}

.canvas-calc-result {
    margin-top: 16px;
    padding: 12px;
    border: 1px solid #d8ead8;
    border-radius: 10px;
    background: #f7fff7;
}

.canvas-calc-result h3 {
    margin: 0 0 10px 0;
    font-size: 20px;
}

.canvas-calc-result table {
    width: 100%;
    border-collapse: collapse;
}

.canvas-calc-result td {
    padding: 7px 6px;
    border-bottom: 1px solid #dbeadb;
    vertical-align: top;
}

.canvas-calc-result tr:last-child td {
    border-bottom: 0;
}

.canvas-calc-note {
    margin: 10px 0 0 0;
    font-size: 14px;
    line-height: 1.45;
}

.canvas-calc-error {
    margin-top: 12px;
    padding: 10px;
    border: 1px solid #f0b5b5;
    border-radius: 8px;
    background: #fff4f4;
    color: #8a1f1f;
}

@media (max-width: 640px) {
    .canvas-calc-box {
        padding: 14px;
    }

    .canvas-calc-grid {
        grid-template-columns: 1fr;
    }

    .canvas-calc-buttons {
        flex-direction: column;
    }

    .canvas-calc-buttons button {
        width: 100%;
    }
}