.hvac-container {
    max-width: 600px;
    margin: 20px auto;
    font-family: sans-serif;
    background: #fff;
    border-radius: 12px;
    box-shadow: 0 10px 25px rgba(0,0,0,0.1);
    overflow: hidden;
}

.hvac-card, .hvac-result-card {
    padding: 30px;
}

.hvac-progress {
    height: 6px;
    background: #eee;
    margin-bottom: 25px;
    border-radius: 3px;
}

.hvac-progress-bar {
    height: 100%;
    background: #0073aa;
    transition: width 0.3s ease;
}

.hvac-options {
    display: grid;
    gap: 12px;
    margin-top: 20px;
}

.hvac-btn {
    padding: 15px;
    border: 2px solid #e2e8f0;
    background: #fff;
    border-radius: 8px;
    cursor: pointer;
    text-align: left;
    transition: all 0.2s;
    font-weight: 500;
}

.hvac-btn:hover {
    border-color: #0073aa;
    background: #f0f9ff;
}

.hvac-btn-primary {
    background: #0073aa;
    color: white;
    border: none;
    padding: 12px 20px;
    border-radius: 6px;
    cursor: pointer;
}

.hvac-result-card {
    text-align: center;
    background: #f8fafc;
}

.hvac-result-card strong {
    display: block;
    font-size: 24px;
    color: #0073aa;
    margin: 10px 0;
}