:root {
    --primary: #2d3748;
    --secondary: #4a5568;
    --accent: #3182ce;
    --bg: #f7fafc;
}

body {
    font-family: system-ui, -apple-system, sans-serif;
    margin: 0;
    padding: 0;
    background-color: var(--bg);
    color: var(--primary);
}

header {
    background-color: #fff;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

nav a {
    margin-left: 1.5rem;
    text-decoration: none;
    color: var(--secondary);
    font-weight: 500;
}

main {
    max-width: 800px;
    margin: 2rem auto;
    padding: 2rem;
    background: #fff;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
}

.btn {
    display: inline-block;
    background-color: var(--accent);
    color: #fff;
    padding: 0.75rem 1.5rem;
    text-decoration: none;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 1rem;
    transition: background 0.2s;
}

.btn:disabled {
    background-color: #cbd5e0;
    cursor: not-allowed;
}

.btn.secondary {
    background-color: var(--secondary);
}

.btn:hover:not(:disabled) {
    background-color: #2b6cb0;
}

.product-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
}

.product-card {
    border: 1px solid #e2e8f0;
    padding: 1.5rem;
    border-radius: 8px;
}

.custom-box {
    border: 1px dashed #a0aec0;
    padding: 1rem;
    border-radius: 5px;
    margin: 1rem 0;
    background: #edf2f7;
}

.legal-checks {
    margin: 15px 0;
    padding: 10px;
    background: #fff;
    border: 1px solid #e2e8f0;
    border-radius: 4px;
    font-size: 0.9rem;
}

.checkbox-row {
    margin-bottom: 8px;
    display: flex;
    align-items: flex-start;
}

.checkbox-row input {
    margin-top: 3px;
    margin-right: 8px;
}

.error {
    color: red;
    font-size: 0.9rem;
    margin-top: 5px;
}

.cart-item {
    border-bottom: 1px solid #e2e8f0;
    padding: 10px 0;
}