/* --- CSS RESET & DEFAULTS --- */
:root {
    --primary-color: #4CAF50;
    --secondary-color: #F5F5F5;
    --text-heading: #333333;
    --text-body: #555555;
    --accent-color: #FF9800;
    --white: #FFFFFF;
    --border-color: #E0E0E0;

    --font-heading: 'Montserrat', sans-serif;
    --font-body: 'Lato', sans-serif;
}

*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: var(--font-body);
    color: var(--text-body);
    background-color: var(--white);
    line-height: 1.6;
}

/* --- LAYOUT --- */
.product-page {
    display: grid;
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
    gap: 40px;
}

@media (min-width: 992px) {
    .product-page {
        grid-template-columns: 1fr 1fr;
        padding: 40px;
    }
}

/* --- COMPONENTS --- */

/* Product Gallery */
.product-gallery {
    width: 100%;
    height: auto;
    border-radius: 16px;
    overflow: hidden;
}

.product-gallery img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* Calculator */
.product-calculator {
    display: flex;
    flex-direction: column;
}

.calculator-header h1 {
    font-family: var(--font-heading);
    font-size: 2.5rem;
    color: var(--text-heading);
    margin-bottom: 10px;
}

.calculator-header p {
    font-size: 1.1rem;
    margin-bottom: 30px;
}

/* Form Styling */
#nutriplan-form {
    display: flex;
    flex-direction: column;
    gap: 25px;
}

.form-step {
    border: none;
}

.form-step legend {
    font-family: var(--font-heading);
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--text-heading);
    margin-bottom: 15px;
}

.options-group {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 15px;
}

/* Visually Hidden Input */
.options-group input[type="radio"],
.options-group input[type="checkbox"] {
    opacity: 0;
    position: absolute;
    width: 0;
    height: 0;
}

.option-card {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px 15px;
    border-radius: 8px;
    border: 2px solid var(--border-color);
    background-color: var(--white);
    cursor: pointer;
    transition: all 0.2s ease-in-out;
    text-align: center;
    font-weight: 600;
}

.options-group input:hover + .option-card {
    border-color: var(--primary-color);
}

.options-group input:checked + .option-card {
    background-color: #e8f5e9; /* Light green */
    border-color: var(--primary-color);
    color: var(--primary-color);
    box-shadow: 0 4px 12px rgba(76, 175, 80, 0.2);
}

/* Price Display */
.price-display {
    margin-top: 30px;
    padding: 20px;
    background-color: var(--secondary-color);
    border-radius: 8px;
}

.price-item, .price-total {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 1.1rem;
}

.price-total {
    margin-top: 10px;
    font-weight: 700;
    font-size: 1.5rem;
    color: var(--text-heading);
}

#price-per-day, #total-price {
    font-family: var(--font-heading);
}

/* CTA Button */
.cta-button {
    margin-top: 30px;
    padding: 20px;
    width: 100%;
    background-color: var(--primary-color);
    color: var(--white);
    font-family: var(--font-heading);
    font-size: 1.2rem;
    font-weight: 700;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: background-color 0.2s ease, box-shadow 0.2s ease;
}

.cta-button:hover {
    background-color: #45a049; /* Darker green */
    box-shadow: 0 8px 15px rgba(0, 0, 0, 0.15);
}