.pressure-converter-container {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen-Sans, Ubuntu, Cantarell, "Helvetica Neue", sans-serif;
    background-color: #fff;
    max-width: 600px;
    margin: 20px auto;
    border-radius: 12px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
    overflow: hidden;
}

.pressure-converter-header {
    background: linear-gradient(135deg, #e74c3c, #f39c12);
    color: white;
    padding: 20px;
    text-align: center;
    position: relative;
}

.pressure-converter-header h3 {
    margin: 0;
    font-size: 22px;
    font-weight: 600;
    text-shadow: 0 1px 2px rgba(0,0,0,0.2);
}

.pressure-converter-box {
    padding: 30px 25px;
    background-color: #f8f9fa;
}

.conversion-area {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 25px;
    gap: 15px;
}

.input-group {
    flex: 1;
    min-width: 200px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.input-group input, 
.input-group select {
    width: 100%;
    padding: 15px;
    border: 2px solid #e1e5e9;
    border-radius: 8px;
    font-size: 16px;
    box-sizing: border-box;
    transition: all 0.3s ease;
    background-color: white;
}

.input-group input:focus,
.input-group select:focus {
    outline: none;
    border-color: #e74c3c;
    box-shadow: 0 0 0 3px rgba(231, 76, 60, 0.1);
}

.input-group input[readonly] {
    background-color: #f8f9fa;
    cursor: not-allowed;
}

.input-group select {
    background-color: white;
    cursor: pointer;
}

.equals {
    font-size: 28px;
    font-weight: bold;
    color: #495057;
    align-self: center;
    margin: 10px 0;
}

.pressure-convert-button {
    background: linear-gradient(135deg, #2c3e50, #34495e);
    color: white;
    border: none;
    padding: 15px 30px;
    font-size: 16px;
    font-weight: 600;
    border-radius: 8px;
    cursor: pointer;
    width: 100%;
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.pressure-convert-button:hover {
    background: linear-gradient(135deg, #34495e, #2c3e50);
    transform: translateY(-1px);
    box-shadow: 0 4px 8px rgba(0,0,0,0.15);
}

.pressure-convert-button:active {
    transform: translateY(0);
}

.instructions {
    margin-top: 20px;
    color: #6c757d;
    font-size: 14px;
    text-align: center;
    line-height: 1.5;
}

@media (max-width: 768px) {
    .pressure-converter-container {
        margin: 10px;
        border-radius: 8px;
    }
    
    .conversion-area {
        flex-direction: column;
    }
    
    .input-group {
        width: 100%;
        min-width: auto;
    }
    
    .equals {
        transform: rotate(90deg);
        margin: 15px 0;
    }
    
    .pressure-converter-header h3 {
        font-size: 20px;
    }
    
    .pressure-converter-box {
        padding: 20px 15px;
    }
}

@media (max-width: 480px) {
    .input-group input, 
    .input-group select {
        padding: 12px;
        font-size: 14px;
    }
    
    .pressure-convert-button {
        padding: 12px 20px;
        font-size: 14px;
    }
}

.pressure-convert-button.loading {
    opacity: 0.7;
    cursor: not-allowed;
}

.pressure-convert-button.loading:after {
    content: "";
    display: inline-block;
    width: 16px;
    height: 16px;
    margin-left: 10px;
    border: 2px solid transparent;
    border-top-color: #ffffff;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}