:root {
  --bg: #f6f7f9; --fg: #1d2330; --muted: #5b6474; --card: #fff; --line: #d9dee6;
  --in: #0b7a3b; --out: #b4400b; --ok: #0b7a3b; --error: #b3261e; --warn: #8a5a00; --warn-bg: #fff5d6;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #14171c; --fg: #e8ebf0; --muted: #a2abb9; --card: #1d2128; --line: #343a45;
          --in: #3fbf75; --out: #f08a4b; --ok: #3fbf75; --error: #ff8a80; --warn: #ffd166; --warn-bg: #3a3218; }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--fg); font: 17px/1.6 system-ui, -apple-system, "Noto Sans TC", sans-serif; }
.wrap { max-width: 480px; margin: 0 auto; padding: 16px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 20px 16px; }
.center { text-align: center; }
h1 { font-size: 1.3rem; margin: 0 0 8px; }
.org { font-weight: 700; font-size: 1.15rem; margin: 0; }
.who { color: var(--muted); margin: 0 0 16px; }
.punch { width: 100%; min-height: 160px; border: 0; border-radius: 18px; font-size: 2.4rem; font-weight: 800; color: #fff;
         background: var(--muted); cursor: pointer; letter-spacing: .2em; }
.punch.in { background: var(--in); }
.punch.out { background: var(--out); }
.punch:disabled { opacity: .55; cursor: default; }
.last { color: var(--muted); margin: 12px 0 0; }
.result { min-height: 1.6em; margin: 12px 0 0; font-weight: 600; }
.ok { color: var(--ok); } .error { color: var(--error); } .warn { color: var(--warn); }
.notice { background: var(--warn-bg); border-radius: 10px; padding: 10px 12px; text-align: left; }
.dev-banner { background: var(--warn-bg); color: var(--warn); border-radius: 10px; padding: 8px 12px; font-size: .9rem; }
.links { display: flex; gap: 16px; justify-content: center; margin: 16px 0 0; flex-wrap: wrap; }
.links a, .linklike { color: var(--muted); background: none; border: 0; font: inherit; text-decoration: underline; cursor: pointer; padding: 0; }
.inline { display: inline; margin: 0; }
.btn { display: inline-block; padding: 12px 16px; border-radius: 10px; text-decoration: none; text-align: center; }
.btn.primary { background: var(--in); color: #fff; }
.block { display: block; width: 100%; margin-top: 12px; }
.field { display: block; margin: 12px 0; }
.field input { font: inherit; padding: 6px 8px; border-radius: 8px; border: 1px solid var(--line); background: var(--card); color: var(--fg); }
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: .95rem; }
th, td { padding: 8px 6px; border-bottom: 1px solid var(--line); text-align: left; white-space: nowrap; }
tr.warn td { color: var(--warn); }
.total { font-weight: 700; }