:root {
  --bg: #f4f5f7;
  --card: #ffffff;
  --text: #151a22;
  --muted: #5d6675;
  --line: #e2e5ea;
  --accent: #0f5bd8;
  --accent-soft: #e8f0fd;
  --ok: #157f3c;
  --ok-soft: #e6f4ea;
  --warn: #a35a00;
  --warn-soft: #fdf1e1;
  --bad: #b42318;
  --bad-soft: #fdeceb;
  --radius: 14px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1216;
    --card: #181c22;
    --text: #e8ebf0;
    --muted: #9aa3b2;
    --line: #2a303a;
    --accent: #6ea2ff;
    --accent-soft: #1b2a45;
    --ok: #5fd08a;
    --ok-soft: #14301f;
    --warn: #f0b45c;
    --warn-soft: #33260f;
    --bad: #ff8a80;
    --bad-soft: #3a1714;
  }
}

* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.55 "IBM Plex Sans Thai", "Leelawadee UI", "Noto Sans Thai", system-ui, sans-serif;
}
a { color: var(--accent); }
.wrap { max-width: 440px; margin: 0 auto; padding: 24px 16px 48px; }
.wrap.wide { max-width: 1100px; }
h1 { font-size: 1.35rem; margin: 0 0 4px; }
h2 { font-size: 1.05rem; margin: 0 0 12px; }
.muted { color: var(--muted); font-size: .9rem; }
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px;
  margin-top: 16px;
}

label { display: block; font-weight: 600; margin: 12px 0 6px; }
input, textarea {
  width: 100%;
  font: inherit;
  color: inherit;
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 10px 12px;
}
textarea { min-height: 84px; resize: vertical; }
button {
  font: inherit;
  font-weight: 600;
  border: 0;
  border-radius: 10px;
  padding: 11px 18px;
  background: var(--accent);
  color: #fff;
  cursor: pointer;
}
button.small { padding: 5px 10px; font-size: .85rem; }
button:hover { filter: brightness(1.08); }
.full { width: 100%; margin-top: 16px; }

.alert { border-radius: 10px; padding: 10px 14px; margin-top: 12px; font-size: .95rem; }
.alert.ok { background: var(--ok-soft); color: var(--ok); }
.alert.bad { background: var(--bad-soft); color: var(--bad); }
.alert.warn { background: var(--warn-soft); color: var(--warn); }

/* ---------- หน้าชำระเงิน ---------- */
.pay { text-align: center; }
.amount-label { color: var(--muted); font-size: .9rem; margin-top: 4px; }
.amount { font-size: 2.6rem; font-weight: 700; letter-spacing: -.5px; line-height: 1.2; }
.amount .sat { color: var(--accent); }
.amount .unit { font-size: 1.1rem; font-weight: 600; color: var(--muted); margin-left: 4px; }
.qr-box {
  background: #fff;               /* QR ต้องดำบนขาวเสมอ แม้โหมดมืด */
  border-radius: 12px;
  padding: 12px;
  width: min(280px, 100%);
  margin: 16px auto 8px;
}
.qr-box svg { display: block; width: 100%; height: auto; }
.timer { font-variant-numeric: tabular-nums; font-weight: 600; }
.status { display: flex; align-items: center; justify-content: center; gap: 8px; margin-top: 14px; font-weight: 600; }
.spinner {
  width: 16px; height: 16px; border-radius: 50%;
  border: 2px solid var(--line); border-top-color: var(--accent);
  animation: spin .9s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
.done { display: none; padding: 12px 0 4px; }
.done .icon { font-size: 3rem; line-height: 1; }
.pay.is-paid .waiting, .pay.is-expired .waiting { display: none; }
.pay.is-paid .done.paid, .pay.is-expired .done.expired { display: block; }
.done.paid h2 { color: var(--ok); }
.done.expired h2 { color: var(--bad); }

/* ---------- admin ---------- */
.setup { display: grid; grid-template-columns: 1fr; gap: 16px; margin-top: 12px; }
@media (min-width: 640px) { .setup { grid-template-columns: 1fr 1fr; } }
.setup-step { border: 1px solid var(--line); border-radius: 12px; padding: 14px; }
.setup-step .muted { margin-top: 6px; }
.setup-step code { word-break: break-all; }
.qr-box.small { width: min(200px, 100%); margin: 10px 0 0; }
details summary { cursor: pointer; color: var(--accent); margin-top: 8px; font-weight: 600; }
.grid { display: grid; grid-template-columns: 1fr; gap: 0 16px; }
@media (min-width: 900px) { .grid { grid-template-columns: 1fr 1fr; } }
.table-scroll { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: .88rem; }
th, td { text-align: left; padding: 8px 6px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { color: var(--muted); font-weight: 600; white-space: nowrap; }
td.num { text-align: right; font-variant-numeric: tabular-nums; white-space: nowrap; }
td.text { white-space: pre-wrap; word-break: break-word; max-width: 340px; }
code { font-size: .85em; }
.badge { display: inline-block; padding: 1px 8px; border-radius: 99px; font-size: .78rem; font-weight: 600; white-space: nowrap; }
.b-paid, .b-matched { background: var(--ok-soft); color: var(--ok); }
.b-pending { background: var(--accent-soft); color: var(--accent); }
.b-unmatched, .b-parse_failed { background: var(--warn-soft); color: var(--warn); }
.b-expired, .b-ignored, .b-duplicate { background: var(--line); color: var(--muted); }