:root {
    color-scheme: light dark;
    --fg: #111; --muted: #666; --bg: #f6f7f9; --card: #fff;
    --line: #e3e6ea; --accent: #1f6feb; --ok: #1a7f37; --bad: #cf222e; --warn: #9a6700;
}
@media (prefers-color-scheme: dark) {
    :root {
        --fg: #e6e6e6; --muted: #9aa0a6; --bg: #16181d; --card: #1e2128;
        --line: #30343c; --accent: #4a8ff7; --ok: #3fb950; --bad: #f85149; --warn: #d29922;
    }
}
* { box-sizing: border-box; }
body {
    margin: 0; padding: 24px 16px 48px; background: var(--bg); color: var(--fg);
    font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; line-height: 1.5;
}
header, main { max-width: 760px; margin: 0 auto; }
h1 { font-size: 1.5rem; margin: 0 0 4px; }
h2 { font-size: 1rem; margin: 0 0 12px; text-transform: uppercase; letter-spacing: .04em; color: var(--muted); }
section { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 20px; margin: 16px 0; }
.muted { color: var(--muted); }
.small { font-size: .8125rem; }
.mono { font-family: ui-monospace, monospace; font-size: .8125rem; }
ul { list-style: none; margin: 0; padding: 0; }
.products li, .cart li {
    display: flex; align-items: center; justify-content: space-between;
    gap: 12px; padding: 10px 0; border-bottom: 1px solid var(--line);
}
.products li div { display: flex; flex-direction: column; }
.products li .muted { font-size: .8125rem; }
.total { font-size: 1.25rem; font-weight: 600; margin: 14px 0; }
button {
    padding: 8px 14px; border: 1px solid var(--line); border-radius: 8px;
    background: var(--bg); color: var(--fg); font-size: .875rem; cursor: pointer; font-family: inherit;
}
button.primary { width: 100%; padding: 12px; margin-top: 8px; background: var(--accent); color: #fff; border: 0; font-weight: 600; font-size: 1rem; }
button.secondary { width: 100%; margin-top: 8px; background: transparent; color: var(--muted); }
table { width: 100%; border-collapse: collapse; font-size: .875rem; }
th { text-align: left; color: var(--muted); font-weight: 600; padding: 6px 0; border-bottom: 1px solid var(--line); }
td { padding: 8px 0; border-bottom: 1px solid var(--line); }
a { color: var(--accent); }
.badge { display: inline-block; padding: 2px 8px; border-radius: 999px; font-size: .75rem; font-weight: 600; background: var(--bg); border: 1px solid var(--line); }
.badge.paid { color: var(--ok); border-color: var(--ok); }
.badge.failed { color: var(--bad); border-color: var(--bad); }
.badge.awaiting_payment { color: var(--warn); border-color: var(--warn); }
.badge.refunded { color: var(--muted); }
.error {
    max-width: 760px; margin: 0 auto; padding: 10px 14px; border-radius: 8px;
    background: rgba(207, 34, 46, .12); color: var(--bad); font-size: .875rem;
}