:root {
    --primary: #2c3e50;
    --secondary: #3498db;
    --success: #2ecc71;
    --warning: #f39c12;
    --danger: #e74c3c;
    --light: #ecf0f1;
    --dark: #34495e;
    --border-radius: 4px;
    --box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.road-los-calculator * {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

.road-los-calculator {
    background-color: #f5f7fa;
    color: var(--dark);
    line-height: 1.6;
    padding: 20px;
}

.road-los-calculator .container {
    max-width: 1200px;
    margin: 0 auto;
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    overflow: hidden;
}

.road-los-calculator .main-content {
    display: flex;
    flex-wrap: wrap;
    padding: 20px;
    gap: 20px;
}

.road-los-calculator .input-section, 
.road-los-calculator .results-section {
    flex: 1;
    min-width: 300px;
}

.road-los-calculator .form-group {
    margin-bottom: 15px;
    display: flex;
    flex-direction: column;
}

.road-los-calculator .form-row {
    display: flex;
    gap: 15px;
}

.road-los-calculator .form-row .form-group {
    flex: 1;
}

.road-los-calculator label {
    display: block;
    margin-bottom: 5px;
    font-weight: 500;
}

.road-los-calculator .input-with-unit {
    display: flex;
    align-items: center;
}

.road-los-calculator input, 
.road-los-calculator select {
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: var(--border-radius);
    font-size: 1rem;
    flex: 1;
}

.road-los-calculator .unit-select {
    margin-left: 10px;
    width: 80px;
}

.road-los-calculator .radio-group {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 10px;
}

.road-los-calculator .radio-option {
    flex: 1;
    min-width: 140px;
}

.road-los-calculator .radio-option input {
    width: auto;
    margin-right: 5px;
}

.road-los-calculator .btn {
    background: var(--secondary);
    color: white;
    border: none;
    padding: 12px 20px;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    width: 100%;
    transition: background 0.3s;
    margin-top: 10px;
}

.road-los-calculator .btn:hover {
    background: #2980b9;
}

.road-los-calculator .btn-export {
    background: #27ae60;
    width: auto;
    padding: 10px 15px;
    font-size: 0.9rem;
    margin-top: 15px;
}

.road-los-calculator .btn-export:hover {
    background: #219653;
}

.road-los-calculator .results-card {
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    padding: 20px;
    margin-bottom: 20px;
    text-align: center;
}

.road-los-calculator .los-indicator {
    display: flex;
    align-items: center;
    margin-bottom: 20px;
    justify-content: center;
}

.road-los-calculator .los-letter {
    font-size: 4rem;
    font-weight: bold;
    width: 100px;
    height: 100px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    margin-right: 20px;
    color: white;
}

.road-los-calculator .los-A { background: var(--success); }
.road-los-calculator .los-B { background: #7cc152; }
.road-los-calculator .los-C { background: var(--warning); }
.road-los-calculator .los-D { background: #e67e22; }
.road-los-calculator .los-E { background: #e74c3c; }
.road-los-calculator .los-F { background: var(--danger); }

.road-los-calculator .metric-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 15px;
}

.road-los-calculator .metric-table th, 
.road-los-calculator .metric-table td {
    padding: 10px;
    text-align: left;
    border-bottom: 1px solid #eee;
}

.road-los-calculator .metric-table th {
    background: var(--light);
    font-weight: 600;
}

.road-los-calculator .range-hint {
    font-size: 0.8rem;
    color: #666;
    margin-top: 3px;
}

.road-los-calculator .hcm-note {
    font-size: 0.9rem;
    font-style: italic;
    color: #666;
    margin-top: 10px;
}

@media (max-width: 768px) {
    .road-los-calculator .main-content {
        flex-direction: column;
    }
    
    .road-los-calculator .los-indicator {
        flex-direction: column;
        text-align: center;
    }
    
    .road-los-calculator .los-letter {
        margin-right: 0;
        margin-bottom: 10px;
    }
    
    .road-los-calculator .form-row {
        flex-direction: column;
        gap: 0;
    }
}

.road-los-calculator .section-divider {
    height: 1px;
    background: #eee;
    margin: 20px 0;
}