:root {
    --primary-color: #0277bd; /* Light Blue 800 */
    --secondary-color: #29b6f6; /* Light Blue 400 */
    --background-color: #f0f0f0; /* Light Grey/Blue (Unchanged) */
    --card-background: #ffffff;
    --text-color: #333333;
    --border-color: #b5b5cf;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    margin: 0;
    padding: 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
    min-height: 100vh;
}

header {
    text-align: center;
    margin-bottom: 40px;
}

header h1 {
    color: var(--primary-color);
    font-size: 2.5em;
    margin-bottom: 5px;
}

header p {
    color: #666;
    font-size: 1.1em;
}

.calculator-container {
    display: flex;
    gap: 30px;
    max-width: 1200px;
    width: 100%;
}

.inputs-card, .result-card {
    background: var(--card-background);
    padding: 30px;
    border-radius: 12px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    flex: 1;
}

.inputs-card h2, .result-card h2 {
    color: var(--secondary-color);
    margin-top: 0;
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 10px;
    margin-bottom: 20px;
}

/* Input Styles */
.input-group {
    margin-bottom: 20px;
}

.input-group label {
    display: block;
    font-weight: bold;
    margin-bottom: 5px;
    color: var(--primary-color);
}

.input-group input[type="number"], .input-group input[type="text"] {
    width: calc(100% - 20px);
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 1em;
    box-sizing: border-box;
}

.input-group small {
    display: block;
    color: #999;
    margin-top: 5px;
    font-size: 0.9em;
}

hr {
    border: none;
    border-top: 1px dashed var(--border-color);
    margin: 25px 0;
}

/* Radio Group Style */
.radio-group {
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
    padding: 5px 0;
}

.radio-label {
    display: flex;
    align-items: center;
    gap: 5px;
    cursor: pointer;
    font-size: 1em;
    padding: 8px 12px;
    background-color: var(--background-color);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    transition: all 0.2s ease;
}

.radio-label:hover {
    background-color: #e0e0e0;
}

/* Style when radio is checked (using :has selector if supported, or simpler checked styling) */
.radio-label:has(input[type="radio"]:checked) {
    background-color: var(--secondary-color);
    color: white;
    border-color: var(--secondary-color);
    font-weight: bold;
}

/* Fallback/Alternative for older browsers or simple radio styling */
input[type="radio"] {
    accent-color: var(--primary-color);
    transform: scale(1.2);
}

/* Button Style */
#calculateBtn {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 12px 25px;
    border-radius: 8px;
    font-size: 1.1em;
    cursor: pointer;
    width: 100%;
    transition: background-color 0.3s, transform 0.1s;
    margin-top: 10px;
    font-weight: bold;
}

#calculateBtn:hover {
    background-color: #01579b;
    transform: translateY(-1px);
}

#downloadPdfBtn {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 12px 25px;
    border-radius: 8px;
    font-size: 1.1em;
    cursor: pointer;
    width: 100%;
    transition: background-color 0.3s, transform 0.1s;
    margin-top: 20px;
    font-weight: bold;
}

#downloadPdfBtn:hover {
    background-color: #01579b; /* Darker Blue */
    transform: translateY(-1px);
}

/* Result Styles */
.result-card {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.breakdown p {
    display: flex;
    justify-content: space-between;
    padding: 8px 0;
    border-bottom: 1px dotted var(--border-color);
}

.breakdown .sub-total {
    font-weight: bold;
    color: var(--primary-color);
    border-bottom: 2px solid var(--primary-color);
    margin-top: 15px;
    padding-bottom: 15px;
}

.cost-value {
    font-weight: 600;
}

.final-price {
    text-align: center;
    margin-top: 30px;
    padding: 20px;
    background-color: #e1f5fe; /* Light Blue 50 */
    border-radius: 10px;
    border: 2px solid var(--secondary-color);
}

.final-price h3 {
    margin: 0;
    color: var(--secondary-color);
    font-size: 1.5em;
}

.total-value {
    font-size: 3em;
    font-weight: bold;
    color: var(--primary-color);
    display: block;
}

.note {
    text-align: center;
    font-size: 0.85em;
    color: #666;
    margin-top: 20px;
}

/* Responsive Design */
@media (max-width: 900px) {
    .calculator-container {
        flex-direction: column;
    }
    
    .inputs-card, .result-card {
        flex: auto;
    }
}