:root { 
    /* Base Colors */
    --primary-green: #008201; 
    --dark-blue: #050d39; 
    
    /* Body Colors */
    --body-bg-color: #f9f9f9;
    
    /* Card Colors */
    --checkout-card-bg: #fff;
    --checkout-card-shadow-color: rgba(0,0,0,0.05);
    
    /* Thank You Card Colors */
    --thank-you-card-bg: #fff;
    --thank-you-card-shadow-color: rgba(0,0,0,0.1);
    
    /* Icon Colors */
    --success-icon-color: var(--primary-green);
    
    /* Heading Colors */
    --heading-color: var(--dark-blue);
    
    /* Text Colors */
    --paragraph-color: #666;
    --label-color: #555;
    
    /* Button Colors */
    --btn-home-bg: var(--primary-green);
    --btn-home-text-color: white;
    --btn-home-hover-bg: var(--dark-blue);
    
    /* Input Colors */
    --input-border-color: #ddd;
    --input-bg-color: #fff;
    
    /* Product Brief Colors */
    --product-brief-border-color: #eee;
    
    /* Qty Button Colors */
    --qty-btn-bg: #eee;
    --qty-btn-border-color: #ddd;
    --qty-input-bg: #fff;
    
    /* Place Order Button Colors */
    --place-order-btn-bg: var(--primary-green);
    --place-order-btn-text-color: white;
    
    /* Bill Line Colors */
    --total-border-color: #eee;
}

body { 
    font-family: 'Segoe UI', sans-serif; 
    background: var(--body-bg-color); 
    margin: 0; 
    padding: 0; 
}

.checkout-container { 
    max-width: 1100px; 
    margin: 20px auto; 
    display: grid; 
    grid-template-columns: 1fr 400px; 
    gap: 20px; 
    padding: 10px; 
}

.checkout-card { 
    background: var(--checkout-card-bg); 
    padding: 20px; 
    border-radius: 8px; 
    box-shadow: 0 2px 10px var(--checkout-card-shadow-color); 
    height: fit-content;
}

/* Thank You Card Style */
.thank-you-card {
    grid-column: span 2;
    text-align: center;
    padding: 60px 20px;
    background: var(--thank-you-card-bg);
    border-radius: 12px;
    box-shadow: 0 5px 20px var(--thank-you-card-shadow-color);
    max-width: 700px;
    margin: 40px auto;
}
.thank-you-card i { 
    color: var(--success-icon-color); 
    font-size: 80px; 
    margin-bottom: 20px; 
}
.thank-you-card h2 { 
    font-size: 2.5rem; 
    color: var(--heading-color); 
    margin-bottom: 10px; 
}
.thank-you-card p { 
    color: var(--paragraph-color); 
    font-size: 1.1rem; 
    margin-bottom: 30px; 
}
.btn-home {
    display: inline-block;
    padding: 15px 40px;
    background: var(--btn-home-bg);
    color: var(--btn-home-text-color);
    text-decoration: none;
    border-radius: 30px;
    font-weight: bold;
    transition: 0.3s;
}
.btn-home:hover { 
    transform: scale(1.05); 
    background: var(--btn-home-hover-bg); 
}

h2, h3 { 
    margin-top: 0; 
    color: var(--heading-color); 
}
.form-grid { 
    display: grid; 
    grid-template-columns: 1fr 1fr; 
    gap: 15px; 
}
.form-group { 
    margin-bottom: 15px; 
}
.form-group.full { 
    grid-column: span 2; 
}
label { 
    display: block; 
    font-size: 14px; 
    margin-bottom: 5px; 
    color: var(--label-color); 
}
input, select { 
    width: 100%; 
    padding: 12px; 
    border: 1px solid var(--input-border-color); 
    border-radius: 5px; 
    box-sizing: border-box; 
    font-size: 16px; 
    background: var(--input-bg-color);
}
.product-brief { 
    display: flex; 
    gap: 15px; 
    margin-bottom: 20px; 
    padding-bottom: 15px; 
    border-bottom: 1px solid var(--product-brief-border-color); 
    align-items: center; 
}
.product-brief img { 
    width: 70px; 
    height: 90px; 
    object-fit: cover; 
    border-radius: 5px; 
}
.qty-wrapper { 
    display: flex; 
    align-items: center; 
    gap: 10px; 
    margin-top: 5px; 
}
.qty-btn { 
    background: var(--qty-btn-bg); 
    border: 1px solid var(--qty-btn-border-color); 
    width: 35px; 
    height: 35px; 
    cursor: pointer; 
    border-radius: 4px; 
    font-size: 18px; 
    font-weight: bold; 
    display: flex; 
    align-items: center; 
    justify-content: center; 
}
#qtyInput { 
    width: 60px; 
    text-align: center; 
    padding: 8px; 
    background: var(--qty-input-bg); 
    border: 1px solid var(--input-border-color);
}
.place-order-btn { 
    width: 100%; 
    background: var(--place-order-btn-bg); 
    color: var(--place-order-btn-text-color); 
    border: none; 
    padding: 15px; 
    border-radius: 5px; 
    font-size: 1.1rem; 
    font-weight: bold; 
    cursor: pointer; 
    margin-top: 20px; 
    transition: background 0.3s; 
}
.bill-line { 
    display: flex; 
    justify-content: space-between; 
    margin-bottom: 10px; 
}
.total { 
    font-weight: bold; 
    font-size: 1.2rem; 
    border-top: 1px solid var(--total-border-color); 
    padding-top: 10px; 
    margin-top: 10px; 
}

@media (max-width: 992px) { 
    .checkout-container { 
        grid-template-columns: 1fr; 
    } 
    .thank-you-card { 
        grid-column: span 1; 
    } 
}