:root {
    --ink: #172033;
    --muted: #64748b;
    --line: #dbe3ef;
    --brand: #1957d2;
    --brand-dark: #123f9c;
    --surface: #ffffff;
    --page: #f6f8fb;
}

body {
    background: var(--page);
    color: var(--ink);
    font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

.checkout-shell {
    min-height: 100vh;
    display: grid;
    place-items: center;
    padding: 28px 14px;
}

.checkout-card, .admin-card {
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: 8px;
    box-shadow: 0 18px 45px rgba(15, 23, 42, 0.08);
}

.brand-mark {
    width: 48px;
    height: 48px;
    border-radius: 8px;
    background: var(--brand);
    color: #fff;
    display: grid;
    place-items: center;
    font-weight: 800;
}

.method-option {
    border: 1px solid var(--line);
    border-radius: 8px;
    cursor: pointer;
    transition: border-color .2s, box-shadow .2s;
    min-height: 92px;
}

.method-option:has(input:checked) {
    border-color: var(--brand);
    box-shadow: 0 0 0 3px rgba(25, 87, 210, .12);
}

.method-icon {
    width: 34px;
    height: 34px;
    object-fit: contain;
}

.btn-primary {
    background: var(--brand);
    border-color: var(--brand);
}

.btn-primary:hover {
    background: var(--brand-dark);
    border-color: var(--brand-dark);
}

.admin-sidebar {
    min-height: 100vh;
    background: #111827;
}

.admin-sidebar .nav-link {
    color: #cbd5e1;
    border-radius: 6px;
}

.admin-sidebar .nav-link:hover,
.admin-sidebar .nav-link.active {
    color: #fff;
    background: rgba(255,255,255,.1);
}

.stat-card {
    border: 1px solid var(--line);
    border-radius: 8px;
    background: #fff;
}

.table td, .table th {
    vertical-align: middle;
}

@media (max-width: 767px) {
    .admin-sidebar {
        min-height: auto;
    }
}