:root {
  --blue: #233f8f; --blue-soft: #eef4ff; --ink: #182230; --muted: #667085; --line: #cbd5e1;
  --bg: #eef2f6; --paper: #fff; --red: #b42318; --red-soft: #fef3f2; --green: #067647; --green-soft: #ecfdf3;
  --font: "Sarabun", "Noto Sans Thai", system-ui, -apple-system, "Segoe UI", sans-serif;
}
* { box-sizing: border-box; }
html, body { margin: 0; background: var(--bg); color: var(--ink); font-family: var(--font); font-size: 16px; }
[hidden] { display: none !important; }
.bar { position: sticky; top: 0; z-index: 2; display: flex; justify-content: space-between; align-items: center;
  padding: 10px 16px; padding-top: max(10px, env(safe-area-inset-top)); background: var(--blue); color: #fff; }
.net { font-size: 13px; border-radius: 999px; padding: 2px 10px; background: rgba(255,255,255,.18); }
.net.off { background: #fda29b; color: #55160c; }
.view { width: min(720px, 100%); margin: 0 auto; padding: 12px 16px 32px; display: grid; gap: 12px; }
.card { background: var(--paper); border: 1px solid var(--line); border-radius: 10px; padding: 16px; }
h1 { margin: 0 0 12px; color: var(--blue); font-size: 22px; }
form { display: grid; gap: 8px; }
label { font-weight: 700; color: #344054; }
input { width: 100%; height: 48px; border: 1px solid var(--line); border-radius: 8px; padding: 0 12px; font: inherit; background: #fff; }
input.pin { letter-spacing: .4em; text-align: center; font-size: 22px; }
button { height: 48px; border: 1px solid var(--blue); border-radius: 8px; background: var(--blue); color: #fff;
  font: inherit; font-weight: 700; padding: 0 16px; cursor: pointer; }
button:disabled { opacity: .6; }
button.secondary { background: #fff; color: var(--blue); border-color: var(--line); }
button.danger { background: #fff; color: var(--red); border-color: var(--line); }
.msg { min-height: 22px; font-weight: 700; color: var(--red); }
.msg.ok { color: var(--green); }
.hint { color: var(--muted); font-size: 14px; margin: 0; }
.banner { border-radius: 8px; padding: 10px 12px; font-weight: 700; }
.banner.fresh { background: var(--green-soft); color: var(--green); }
.banner.old { background: var(--red-soft); color: var(--red); }
.banner.none { background: var(--blue-soft); color: var(--blue); }
.search { display: grid; grid-template-columns: 1fr auto; gap: 8px; position: sticky; top: 48px; z-index: 1; }
.search input { font-size: 18px; }
.scan { display: grid; gap: 8px; }
.scan video { width: 100%; max-height: 50vh; background: #000; border-radius: 8px; object-fit: cover; }
.results { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; }
.item { background: var(--paper); border: 1px solid var(--line); border-radius: 10px; padding: 12px; display: grid; gap: 4px; }
.item .name { font-weight: 700; }
.item .meta { color: var(--muted); font-size: 13px; word-break: break-all; }
.item .line { display: flex; justify-content: space-between; align-items: baseline; gap: 8px; flex-wrap: wrap; }
.item .price { color: var(--blue); font-size: 22px; font-weight: 800; }
.item .stock { font-weight: 700; }
.item .stock.low { color: var(--red); }
.tools { display: grid; gap: 10px; }
.tools summary { font-weight: 700; color: var(--blue); cursor: pointer; }
.tools[open] > :not(summary) { margin-top: 10px; }
.row { display: grid; grid-template-columns: 1fr auto; gap: 8px; }
.steps { padding-left: 20px; display: grid; gap: 4px; }