.concrete-calculator {
    max-width: 800px;
    margin: 20px auto;
    padding: 20px;
    background: #f5f5f5;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.calc-container {
    background: white;
    padding: 20px;
    border-radius: 8px;
}

.shape-selector-container {
    display: flex;
    gap: 20px;
    margin-bottom: 20px;
    align-items: flex-end;
}

.shape-selector {
    flex: 1;
}

.shape-image {
    flex: 0 0 300px;
}

.shape-image img {
    width: 300px;
    height: 300px;
    border: 1px solid #ddd;
    border-radius: 4px;
    object-fit: contain;
}

.input-group {
    margin-bottom: 15px;
}

.input-group label {
    display: block;
    margin-bottom: 5px;
    font-weight: bold;
}

.dimension-input-container {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.dimension-input {
    display: flex;
    align-items: center;
    gap: 5px;
}

.dimension-input input {
    width: 80px;
    padding: 8px;
    border: 1px solid #ddd;
    border-radius: 4px;
}

.dimension-input input.invalid {
    border-color: #ff0000;
}

.unit-label {
    white-space: nowrap;
}

.error-message {
    color: #ff0000;
    font-size: 0.8em;
    margin-left: 5px;
    white-space: nowrap;
    display: none;
}

.error-message.show {
    display: inline;
}

.results {
    margin-top: 20px;
    padding: 15px;
    background: #e9f5ff;
    border-radius: 4px;
}

.result-value {
    font-size: 1.2em;
    margin: 10px 0;
    font-weight: bold;
    color: #0066cc;
}