:root {
  --bg: #f6f7f9;
  --panel: #ffffff;
  --ink: #1d2433;
  --muted: #5b6475;
  --line: #e3e6ec;
  --accent: #0f766e;
  --accent-ink: #ffffff;
  --accent-soft: #e6f4f2;
  --warn: #9a4a07;
  --warn-soft: #fef3c7;
  --err: #b42318;
  --err-soft: #fee4e2;
  --ok: #067647;
  --ok-soft: #dcfae6;
  --radius: 10px;
  font-family: -apple-system, BlinkMacSystemFont, "PingFang TC", "Noto Sans TC", "Microsoft JhengHei", sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1218;
    --panel: #171b23;
    --ink: #e7eaf0;
    --muted: #9aa3b2;
    --line: #2a303b;
    --accent: #2bb3a3;
    --accent-ink: #062320;
    --accent-soft: #12302d;
    --warn: #f5b84b;
    --warn-soft: #3a2c10;
    --err: #ff8a80;
    --err-soft: #3a1714;
    --ok: #6ee7a8;
    --ok-soft: #0f2e1f;
  }
}

* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--ink); font-size: 14px; line-height: 1.55; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.layout { display: grid; grid-template-columns: 220px minmax(0, 1fr); min-height: 100vh; }
.sidebar {
  background: var(--panel); border-right: 1px solid var(--line); padding: 20px 14px;
  position: sticky; top: 0; height: 100vh; display: flex; flex-direction: column; gap: 18px;
}
.brand { font-weight: 700; font-size: 16px; padding: 0 8px; }
.sidebar nav { display: flex; flex-direction: column; gap: 2px; }
.sidebar nav a { color: var(--ink); padding: 8px 10px; border-radius: 8px; }
.sidebar nav a:hover { background: var(--bg); text-decoration: none; }
.sidebar nav a.active { background: var(--accent-soft); color: var(--accent); font-weight: 600; }
.status { margin-top: auto; font-size: 12.5px; color: var(--muted); display: flex; flex-direction: column; gap: 6px; padding: 0 8px; }
.dot { display: inline-block; width: 8px; height: 8px; border-radius: 50%; margin-right: 6px; background: var(--muted); }
.dot.on { background: var(--ok); }

main { padding: 28px 32px 60px; max-width: 1240px; width: 100%; }
h1 { font-size: 22px; margin: 0 0 6px; }
h2 { font-size: 16px; margin: 0 0 12px; }
h3 { font-size: 14px; margin: 0 0 8px; }
.lead { color: var(--muted); margin: 0 0 20px; }
.card { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 18px 20px; margin-bottom: 18px; }
.grid { display: grid; gap: 14px; }
.grid.stats { grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); margin-bottom: 18px; }
.grid.two { grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); }
.stat { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 14px 16px; }
.stat .num { font-size: 24px; font-weight: 700; font-variant-numeric: tabular-nums; }
.stat .label { color: var(--muted); font-size: 12.5px; }

.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; }
th, td { text-align: left; padding: 9px 10px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { font-size: 12.5px; color: var(--muted); font-weight: 600; white-space: nowrap; }
td.num { font-variant-numeric: tabular-nums; white-space: nowrap; }
table.wide { min-width: 960px; }
td.contact { min-width: 220px; word-break: break-all; }
.row-actions { flex-wrap: nowrap; }
.muted { color: var(--muted); }
.small { font-size: 12.5px; }
.nowrap { white-space: nowrap; }
.bio { min-width: 200px; max-width: 380px; color: var(--muted); font-size: 12.5px; overflow-wrap: anywhere; }
.break { overflow-wrap: anywhere; }

.tag { display: inline-block; padding: 1px 8px; border-radius: 999px; font-size: 12px; background: var(--bg); border: 1px solid var(--line); white-space: nowrap; }
.tag.ok { background: var(--ok-soft); color: var(--ok); border-color: transparent; }
.tag.warn { background: var(--warn-soft); color: var(--warn); border-color: transparent; }
.tag.err { background: var(--err-soft); color: var(--err); border-color: transparent; }

.flash { padding: 10px 14px; border-radius: 8px; margin-bottom: 16px; }
.flash.ok { background: var(--ok-soft); color: var(--ok); }
.flash.err { background: var(--err-soft); color: var(--err); }
.flash.warn { background: var(--warn-soft); color: var(--warn); }

form.inline { display: inline; }
.btn {
  display: inline-flex; align-items: center; gap: 6px; padding: 7px 14px; border-radius: 8px;
  border: 1px solid var(--line); background: var(--panel); color: var(--ink); font: inherit; cursor: pointer;
}
.btn { white-space: nowrap; }
.btn:hover { border-color: var(--muted); text-decoration: none; }
.btn.primary { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }
.btn.danger { color: var(--err); }
.btn.small { padding: 3px 9px; font-size: 12.5px; }
.actions { display: flex; flex-wrap: wrap; gap: 6px; align-items: center; }

label { display: block; font-weight: 600; margin: 14px 0 4px; }
label.check { font-weight: 400; display: inline-flex; align-items: center; gap: 6px; margin: 4px 14px 4px 0; }
.hint { color: var(--muted); font-size: 12.5px; margin-top: 4px; }
input[type=text], input[type=email], input[type=password], input[type=number], input[type=time], input[type=url],
select, textarea {
  width: 100%; padding: 8px 10px; border: 1px solid var(--line); border-radius: 8px;
  background: var(--panel); color: var(--ink); font: inherit;
}
textarea { min-height: 110px; resize: vertical; }
textarea.tall { min-height: 240px; }
.row { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 0 16px; }
.toolbar { display: flex; flex-wrap: wrap; gap: 10px; align-items: flex-end; margin-bottom: 14px; }
.toolbar label { margin: 0 0 4px; font-size: 12.5px; }
.toolbar input, .toolbar select { width: auto; min-width: 110px; }
.form-footer { margin-top: 18px; display: flex; gap: 10px; flex-wrap: wrap; }

pre.message {
  white-space: pre-wrap; background: var(--bg); border: 1px solid var(--line); border-radius: 8px;
  padding: 12px; font: inherit; margin: 8px 0 0; overflow-wrap: anywhere;
}
.dm-card { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.3fr); gap: 18px; }
.dm-card textarea { min-height: 150px; }
.checklist { margin: 0; padding-left: 20px; }
.checklist li { margin: 5px 0; }
.checklist .done { color: var(--muted); text-decoration: line-through; }
.pager { display: flex; gap: 10px; align-items: center; margin-top: 12px; }
details { margin-top: 6px; }
details summary { cursor: pointer; font-weight: 600; }
code { background: var(--bg); border: 1px solid var(--line); border-radius: 5px; padding: 0 5px; font-size: 12.5px; }

@media (max-width: 860px) {
  .layout { grid-template-columns: 1fr; }
  .sidebar { position: static; height: auto; }
  .dm-card { grid-template-columns: 1fr; }
  main { padding: 20px 16px; }
}
.btn[disabled] { opacity: 0.5; cursor: not-allowed; }