:root {
  --bg: #f4f6f4;
  --card: #ffffff;
  --text: #1d2420;
  --muted: #66706a;
  --line: #d6ddd8;
  --accent: #1f7a4d;
  --accent-text: #ffffff;
  --danger: #c0392b;
  --note-bg: #eef7ee;
  --ink: #111111;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #151917;
    --card: #1f2522;
    --text: #e6ebe8;
    --muted: #9aa49e;
    --line: #36403b;
    --accent: #3fae75;
    --accent-text: #0d130f;
    --danger: #ef6b5b;
    --note-bg: #1c2b22;
  }
}

* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, 'Noto Sans TC', 'Microsoft JhengHei', sans-serif;
  line-height: 1.6;
}
.wrap { max-width: 760px; margin: 0 auto; padding: 16px; }
.wide { max-width: 1100px; }
h1 { font-size: 1.4rem; margin: 8px 0 16px; }
h2 { font-size: 1.1rem; margin: 0 0 12px; }
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 16px;
  margin-bottom: 16px;
}
.muted { color: var(--muted); font-size: 0.9rem; }
.error { color: var(--danger); }
.hidden { display: none !important; }

label { display: block; font-weight: 600; margin: 12px 0 4px; }
label .opt { font-weight: 400; color: var(--muted); font-size: 0.85rem; }
input[type=text], input[type=number], input[type=date], input[type=password] {
  width: 100%;
  padding: 10px 12px;
  font-size: 1rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--card);
  color: var(--text);
}
.check { display: flex; gap: 8px; align-items: flex-start; font-weight: 400; }
.check input { margin-top: 5px; width: 18px; height: 18px; }
.row { display: grid; grid-template-columns: 1fr 1fr; gap: 0 16px; }
@media (max-width: 560px) { .row { grid-template-columns: 1fr; } }

button {
  font: inherit;
  padding: 10px 18px;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: var(--card);
  color: var(--text);
  cursor: pointer;
}
button.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-text); font-weight: 600; }
button.danger { color: var(--danger); border-color: var(--danger); }
button:disabled { opacity: 0.5; cursor: not-allowed; }
.actions { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 16px; }

.note-card {
  background: var(--note-bg);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 12px 16px;
}
.note-card p { margin: 4px 0; }
.note-card .amount b { font-size: 1.3rem; }
.note-card .nt, .note-card .hint { color: var(--muted); font-size: 0.85rem; }

.pad-box {
  position: relative;
  border: 2px dashed var(--line);
  border-radius: 8px;
  background: #ffffff;
  touch-action: none;
}
.pad-box canvas { display: block; width: 100%; height: 240px; touch-action: none; }
.pad-box .placeholder {
  position: absolute; inset: 0;
  display: flex; align-items: center; justify-content: center;
  color: #b8bfba; font-size: 1.4rem; pointer-events: none;
}
@media (orientation: landscape) and (max-height: 500px) {
  .pad-box canvas { height: 60vh; }
}

table { width: 100%; border-collapse: collapse; }
th, td { text-align: left; padding: 8px 6px; border-bottom: 1px solid var(--line); font-size: 0.95rem; }
.badge { display: inline-block; padding: 1px 8px; border-radius: 999px; font-size: 0.8rem; border: 1px solid var(--line); }
.badge.signed { background: var(--accent); border-color: var(--accent); color: var(--accent-text); }
.linkbox { display: flex; gap: 8px; margin-top: 8px; }
.linkbox input { flex: 1; }