:root {
    --primary: #00C17E;
    --bg: #f8f9fa;
    --text: #333;
    --white: #ffffff;
}

body {
    font-family: 'Inter', -apple-system, sans-serif;
    background: var(--bg);
    margin: 0;
    padding: 15px;
    display: flex;
    justify-content: center;
    color: var(--text);
}

.checkout-card {
    background: var(--white);
    max-width: 450px;
    width: 100%;
    border-radius: 24px;
    box-shadow: 0 15px 35px rgba(0,0,0,0.1);
    overflow: hidden;
}

.product-image {
    width: 100%;
    height: 300px;
    object-fit: cover;
    background: #eee;
}

.content { padding: 25px; }

.seller-badge {
    background: #e8fcf4;
    color: var(--primary);
    padding: 6px 14px;
    border-radius: 100px;
    font-size: 13px;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    margin-bottom: 15px;
}

h1 { font-size: 22px; margin: 0; }

.price-tag {
    font-size: 30px;
    font-weight: 800;
    color: var(--primary);
    margin: 10px 0;
    display: block;
}

.form-group { margin-top: 20px; }

label { font-size: 12px; font-weight: 700; text-transform: uppercase; color: #888; margin-left: 5px; }

input {
    width: 100%;
    padding: 15px;
    border: 2px solid #eee;
    border-radius: 14px;
    font-size: 16px;
    box-sizing: border-box;
    margin: 5px 0 15px 0;
    transition: 0.3s;
}

input:focus { border-color: var(--primary); outline: none; }

.btn-order {
    background: var(--primary);
    color: white;
    border: none;
    width: 100%;
    padding: 18px;
    border-radius: 16px;
    font-size: 18px;
    font-weight: bold;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    transition: transform 0.2s;
}

.btn-order:active { transform: scale(0.98); }

#loading-screen { text-align: center; padding: 100px 20px; color: var(--primary); }