:root {
  --bg: #f5f6f8; --fg: #1a1d23; --muted: #6b7280; --card: #fff; --line: #e5e7eb; --hover: #f0f2f5;
  --ok: #16a34a; --bad: #dc2626; --accent: #2563eb; --on-accent: #fff;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0e1014; --fg: #e5e7eb; --muted: #9ca3af; --card: #16191f; --line: #262a33; --hover: #1d2129;
    --ok: #22c55e; --bad: #ef4444; --accent: #60a5fa; --on-accent: #0e1014;
  }
}

* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--fg); font: 15px/1.45 system-ui, -apple-system, "Segoe UI", sans-serif; }
main { max-width: 820px; margin: 0 auto; padding: 28px 16px 48px; }
a { color: inherit; text-decoration: none; }
h1 { font-size: 22px; margin: 0; overflow-wrap: anywhere; }
h2 { font-size: 12px; text-transform: uppercase; letter-spacing: .06em; color: var(--muted); margin: 28px 0 8px; }
header { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; margin-bottom: 18px; }
header form { margin-left: auto; }
footer { margin-top: 14px; font-size: 13px; color: var(--muted); }
button { font: inherit; cursor: pointer; }

.muted { color: var(--muted); }
.mono { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 13px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 10px; overflow: hidden; }
.back { color: var(--accent); font-size: 14px; }
.link { background: none; border: 0; color: var(--accent); padding: 0; }
.err { color: var(--bad); }

/* status */
.dot { width: 10px; height: 10px; border-radius: 50%; background: var(--bad); flex: none; }
.dot.ok { background: var(--ok); }
.badge { font-size: 12px; padding: 1px 8px; border-radius: 99px; border: 1px solid currentColor; color: var(--bad); }
.badge.ok { color: var(--ok); }

/* host list */
.hosts { list-style: none; margin: 0; padding: 0; }
.hosts li + li { border-top: 1px solid var(--line); }
.hosts a { display: grid; grid-template-columns: 10px 1fr auto; gap: 2px 12px; align-items: center; padding: 12px 16px; }
.hosts a:hover { background: var(--hover); }
.hosts .sub { grid-column: 2 / 4; color: var(--muted); font-size: 13px; overflow-wrap: anywhere; }
.name { font-weight: 600; overflow-wrap: anywhere; }
.meta { font-size: 13px; color: var(--muted); text-align: right; }
.id { font: 400 12px ui-monospace, SFMono-Regular, Menlo, monospace; color: var(--muted); margin-left: 4px; }

/* host detail */
dl { display: grid; grid-template-columns: max-content 1fr; gap: 6px 16px; margin: 0; padding: 14px 16px; }
dt { color: var(--muted); }
dd { margin: 0; overflow-wrap: anywhere; }
table { width: 100%; border-collapse: collapse; }
td { padding: 10px 16px; vertical-align: top; border-top: 1px solid var(--line); }
tr:first-child td { border-top: 0; }
td:first-child { width: 30%; font-weight: 600; }
.events { list-style: none; margin: 0; padding: 0; }
.events li { padding: 10px 16px; border-top: 1px solid var(--line); }
.events li:first-child { border-top: 0; }
.events .mono { color: var(--muted); margin-right: 10px; }

/* rename / forget */
.admin { padding: 14px 16px; display: flex; flex-wrap: wrap; gap: 12px; justify-content: space-between; }
.admin form { display: flex; gap: 8px; min-width: 0; }
.admin input {
  font: inherit; padding: 6px 10px; min-width: 0; width: 220px;
  border: 1px solid var(--line); border-radius: 8px; background: var(--bg); color: var(--fg);
}
.admin button { padding: 6px 12px; border: 1px solid var(--line); border-radius: 8px; background: var(--card); color: var(--fg); }
.admin .danger { color: var(--bad); border-color: currentColor; }

/* login */
.login { max-width: 320px; margin: 12vh auto 0; padding: 24px; display: grid; gap: 12px; }
.login p { margin: 0; }
.login input {
  font: 20px ui-monospace, monospace; letter-spacing: .3em; text-align: center; padding: 10px;
  border: 1px solid var(--line); border-radius: 8px; background: var(--bg); color: var(--fg);
}
.login button { padding: 10px; border: 0; border-radius: 8px; background: var(--accent); color: var(--on-accent); font-weight: 600; }

@media (max-width: 520px) {
  dl { grid-template-columns: 1fr; gap: 2px; }
  dt { margin-top: 8px; }
  td:first-child { width: auto; }
}