:root {
  --bg: #f6f7f9;
  --card: #ffffff;
  --text: #1d2330;
  --muted: #5d6677;
  --line: #d9dee7;
  --accent: #06c755;
  --error: #c62828;
  --warn: #9a5b00;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #14171c; --card: #1d2128; --text: #e8ebf0; --muted: #9aa3b2; --line: #333a45; --error: #ff7b72; --warn: #e3b341; }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text); font: 16px/1.5 "Sarabun", "Noto Sans Thai", system-ui, sans-serif; }
main { max-width: 560px; margin: 0 auto; padding: 16px; }
section { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 16px; margin-bottom: 12px; }
h1 { font-size: 1.25rem; margin: 0 0 4px; }
h2 { font-size: 1.1rem; margin: 0 0 8px; }
label { display: block; margin-top: 10px; color: var(--muted); font-size: .95rem; }
input, select, textarea { display: block; width: 100%; margin-top: 4px; padding: 10px; font: inherit; color: var(--text);
  background: var(--bg); border: 1px solid var(--line); border-radius: 8px; }
label.check { display: flex; gap: 8px; align-items: center; color: var(--text); margin-top: 0; }
label.check input { width: auto; margin: 0; }
.product { display: grid; grid-template-columns: 1fr 96px; gap: 8px; align-items: center; padding: 8px 0; border-bottom: 1px solid var(--line); }
.product .name { color: var(--text); }
.product .price { color: var(--muted); font-size: .9rem; }
.product input { margin: 0; text-align: right; }
.total { text-align: right; margin: 12px 0 0; }
.hint, .status { color: var(--muted); }
.warn { color: var(--warn); }
.error { color: var(--error); }
button { width: 100%; padding: 14px; font: inherit; font-weight: 600; color: #fff; background: var(--accent); border: 0; border-radius: 10px; }
button:disabled { opacity: .6; }