:root {
  --fg: #1f2328; --muted: #656d76; --bg: #ffffff; --panel: #f6f8fa; --border: #d0d7de;
  --accent: #0969da; --ok: #1a7f37; --warn: #9a6700; --bad: #cf222e;
  font-family: system-ui, -apple-system, "Segoe UI", "Noto Sans TC", "Microsoft JhengHei", sans-serif;
  color: var(--fg); background: var(--bg); line-height: 1.6;
}
@media (prefers-color-scheme: dark) {
  :root { --fg: #e6edf3; --muted: #8d96a0; --bg: #0d1117; --panel: #161b22; --border: #30363d;
          --accent: #4493f8; --ok: #3fb950; --warn: #d29922; --bad: #f85149; }
}
* { box-sizing: border-box; }
body { margin: 0; }
header.top { display: flex; align-items: center; gap: 1rem; padding: .75rem 1.25rem; border-bottom: 1px solid var(--border); }
header.top .brand { font-weight: 700; font-size: 1.1rem; color: var(--fg); text-decoration: none; }
header.top nav { display: flex; gap: 1rem; flex: 1; }
header.top nav a { color: var(--muted); text-decoration: none; }
header.top nav a:hover, header.top nav a.active { color: var(--fg); }
header.top .who { color: var(--muted); font-size: .9rem; display: flex; gap: .75rem; align-items: center; }
main { max-width: 960px; margin: 0 auto; padding: 1.5rem 1.25rem 4rem; }
main.narrow { max-width: 560px; }
h1 { font-size: 1.6rem; margin: .5rem 0 1rem; }
h2 { font-size: 1.2rem; margin: 2rem 0 .75rem; }
a { color: var(--accent); }
.muted { color: var(--muted); }
.small { font-size: .875rem; }
.panel { background: var(--panel); border: 1px solid var(--border); border-radius: 8px; padding: 1rem 1.25rem; margin: 1rem 0; }
.btn, button { display: inline-block; font: inherit; padding: .4rem .9rem; border-radius: 6px; border: 1px solid var(--border);
  background: var(--panel); color: var(--fg); cursor: pointer; text-decoration: none; }
.btn.primary, button.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
button.danger { color: var(--bad); }
button:disabled { opacity: .5; cursor: not-allowed; }
form.grid { display: grid; grid-template-columns: 8rem 1fr; gap: .6rem 1rem; align-items: center; }
form.grid .full { grid-column: 1 / -1; }
input, select, textarea { font: inherit; padding: .35rem .5rem; border: 1px solid var(--border); border-radius: 6px;
  background: var(--bg); color: var(--fg); width: 100%; }
textarea { min-height: 4rem; }
table { width: 100%; border-collapse: collapse; font-size: .925rem; }
th, td { text-align: left; padding: .5rem .5rem; border-bottom: 1px solid var(--border); vertical-align: top; }
th { color: var(--muted); font-weight: 600; }
.tag { display: inline-block; padding: 0 .5rem; border-radius: 999px; font-size: .8rem; border: 1px solid currentColor; }
.tag.pending { color: var(--warn); } .tag.approved { color: var(--ok); } .tag.rejected, .tag.revoked { color: var(--bad); }
.notice { padding: .6rem .9rem; border-radius: 6px; border: 1px solid var(--border); margin: .75rem 0; }
.notice.error { border-color: var(--bad); color: var(--bad); }
.notice.ok { border-color: var(--ok); color: var(--ok); }
.notice.warn { border-color: var(--warn); color: var(--warn); }
code, pre { font-family: ui-monospace, "Cascadia Code", Consolas, monospace; font-size: .875rem; }
pre { background: var(--panel); border: 1px solid var(--border); border-radius: 6px; padding: .75rem; overflow-x: auto; margin: .5rem 0; }
.keybox { display: flex; gap: .5rem; align-items: center; }
.keybox code { flex: 1; padding: .5rem; background: var(--panel); border: 1px solid var(--warn); border-radius: 6px; word-break: break-all; }
.tabs { display: flex; gap: .25rem; margin-top: 1rem; flex-wrap: wrap; }
.tabs button[aria-selected="true"] { background: var(--accent); color: #fff; border-color: var(--accent); }
dialog { border: 1px solid var(--border); border-radius: 10px; background: var(--bg); color: var(--fg); max-width: 760px; width: 95vw; padding: 1.25rem 1.5rem; }
dialog::backdrop { background: rgba(0,0,0,.5); }
.row-actions { display: flex; gap: .5rem; flex-wrap: wrap; margin-top: .5rem; }
.review { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: .5rem; margin-top: .5rem; }
.review label { font-size: .8rem; color: var(--muted); }
@media (max-width: 640px) { form.grid { grid-template-columns: 1fr; } .review { grid-template-columns: 1fr 1fr; } }
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: .75rem; margin: 1rem 0; }
.card { background: var(--panel); border: 1px solid var(--border); border-radius: 8px; padding: .75rem 1rem; }
.card .big { font-size: 1.5rem; font-weight: 700; }
dialog.confirm { max-width: 460px; }
label.field { display: grid; gap: .25rem; margin: .5rem 0; }
details.faq { border-bottom: 1px solid var(--border); padding: .6rem 0; }
details.faq summary { cursor: pointer; font-weight: 600; }
details.faq p { margin: .5rem 0 0; }
.hero { padding: 1rem 0 .5rem; }
.hero p { font-size: 1.05rem; }
.steps { counter-reset: s; list-style: none; padding: 0; display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: .75rem; }
.steps li { background: var(--panel); border: 1px solid var(--border); border-radius: 8px; padding: .75rem 1rem; }
.steps li::before { counter-increment: s; content: counter(s); display: inline-block; width: 1.6rem; height: 1.6rem; border-radius: 50%;
  background: var(--accent); color: #fff; text-align: center; margin-right: .5rem; font-weight: 700; }
.msg { border: 1px solid var(--border); border-radius: 8px; padding: .75rem 1rem; margin: .5rem 0; }
.msg .reply { margin-top: .5rem; padding: .5rem .75rem; border-left: 3px solid var(--accent); background: var(--panel); }
.pre-wrap { white-space: pre-wrap; word-break: break-word; }
.filter { display: flex; gap: .5rem; margin: .5rem 0; }
.filter input { max-width: 320px; }
.scroll { overflow-x: auto; }
.warn-text { color: var(--warn); font-weight: 600; }
footer.site { border-top: 1px solid var(--border); color: var(--muted); font-size: .85rem; text-align: center; padding: 1.25rem 1rem 2rem; }
footer.site p { margin: .25rem 0; }
main.legal { max-width: 760px; }
main.legal h2 { font-size: 1.1rem; margin-top: 1.75rem; }
main.legal li { margin: .35rem 0; }