@media (min-width: 901px) {
    .grid-container {
        display: block;
        position: relative;
        height: 100vh;
        padding: 20px;
    }
    .grid-item.top-left {
        position: absolute;
        left: 20px;
        bottom: 20px;
        width: 35%;
        max-width: 400px;
    }
    .grid-item.bottom-left {
        position: absolute;
        left: 20px;
        bottom: 240px;
        width: 35%;
        max-width: 400px;
    }
    .grid-item.top-right {
        position: absolute;
        right: 20px;
        top: 20px;
        width: 35%;
        max-width: 400px;
    }
    .input-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 900px) {
    .grid-container {
        display: flex;
        flex-direction: column;
        padding: 10px;
        gap: 15px;
    }
    .grid-item.top-right {
        order: 1;
    }
    .grid-item.top-left {
        order: 2;
    }
    .grid-item.bottom-left {
        order: 3;
    }
    .input-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .grid-container {
        padding: 10px;
        gap: 15px;
    }
    .grid-item {
        padding: 15px;
    }
    h3 {
        font-size: 16px;
    }
    .input-group label {
        font-size: 12px;
    }
    .input-group input[type="number"],
    .input-group select {
        padding: 6px;
        font-size: 13px;
    }
    .calc-btn {
        padding: 10px;
        font-size: 14px;
    }
    .result-table {
        font-size: 12px;
    }
    .result-table th,
    .result-table td {
        padding: 6px 4px;
    }
}

@media (max-width: 480px) {
    .grid-container {
        padding: 5px;
        gap: 10px;
    }
    .grid-item {
        padding: 10px;
    }
    h3 {
        font-size: 14px;
        margin-bottom: 10px;
    }
    .input-grid {
        gap: 10px;
    }
    .cost-explanation {
        font-size: 10px;
        padding: 8px;
    }
    .modal-content {
        max-width: 98%;
        width: 98%;
        max-height: 80vh;
        margin: 10vh 1%;
        border-radius: 8px;
    }
    .modal-header {
        padding: 12px 15px;
    }
    .modal-header h3 {
        font-size: 16px;
    }
    .modal-body {
        padding: 12px;
        max-height: calc(65vh - 100px);
        overflow-y: auto;
        overflow-x: hidden;
    }
    .input-grid {
        grid-template-columns: 1fr;
        gap: 10px;
    }
    .input-group {
        margin-bottom: 10px;
    }
    .input-group label {
        font-size: 12px;
        margin-bottom: 4px;
    }
    .input-group input[type="number"],
    .input-group select {
        padding: 6px;
        font-size: 13px;
    }
    .calc-btn {
        padding: 10px;
        font-size: 14px;
        margin-top: 8px;
    }
}