:root {
  --bg: #f6f7f9; --card: #ffffff; --ink: #1a1d21; --muted: #6b7280;
  --line: #e5e7eb; --accent: #2b6cff; --ok: #16a34a; --warn: #d97706;
  --danger: #dc2626; --pill: #eef2ff; --code: #f3f4f6;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0e1116; --card: #161b22; --ink: #e6edf3; --muted: #8b949e;
    --line: #2a313a; --accent: #4d84ff; --ok: #3fb950; --warn: #d29922;
    --danger: #f85149; --pill: #1c2333; --code: #0b0f14;
  }
}
* { box-sizing: border-box; }
body { margin: 0; font: 15px/1.5 system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  background: var(--bg); color: var(--ink); }
h1, h2, h3 { margin: 0 0 .5rem; font-weight: 650; }
h2 { font-size: 1rem; } h3 { font-size: .85rem; color: var(--muted); margin-top: 1rem; }
.muted { color: var(--muted); } .error { color: var(--danger); font-size: .9rem; }
button { font: inherit; cursor: pointer; border: 1px solid var(--line); background: var(--accent);
  color: #fff; border-radius: 8px; padding: .45rem .8rem; }
button.ghost { background: transparent; color: var(--ink); }
button.warn { background: var(--warn); } button.danger { background: var(--danger); }
button.small { padding: .2rem .5rem; font-size: .8rem; }
button:disabled { opacity: .5; cursor: default; }
input, select { font: inherit; padding: .5rem .6rem; border: 1px solid var(--line);
  border-radius: 8px; background: var(--card); color: var(--ink); width: 100%; }

/* login */
.login-body { display: grid; place-items: center; min-height: 100vh; }
.login-card { background: var(--card); border: 1px solid var(--line); border-radius: 16px;
  padding: 2rem; width: min(360px, 92vw); box-shadow: 0 10px 30px rgba(0,0,0,.08); }
.login-card label { display: block; margin: .8rem 0; font-size: .85rem; color: var(--muted); }
.login-card input { margin-top: .3rem; }
.login-card button { width: 100%; margin-top: .6rem; }
.brand { display: flex; align-items: center; gap: .5rem; font-weight: 650; }
.brand .dot { width: 10px; height: 10px; border-radius: 50%; background: var(--accent); }
.tag { font-size: .7rem; background: var(--pill); color: var(--accent); padding: .1rem .5rem;
  border-radius: 999px; font-weight: 600; }

/* layout */
.topbar { display: flex; justify-content: space-between; align-items: center;
  padding: .8rem 1.2rem; background: var(--card); border-bottom: 1px solid var(--line); }
.topbar-right { display: flex; align-items: center; gap: .8rem; }
.grid { max-width: 1100px; margin: 1.2rem auto; padding: 0 1rem; display: grid; gap: 1rem;
  grid-template-columns: 1fr 1fr; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 1rem 1.1rem; }
.card.wide { grid-column: 1 / -1; }
@media (max-width: 720px) { .grid { grid-template-columns: 1fr; } }

.statgrid { display: grid; grid-template-columns: 1fr 1fr; gap: .5rem .8rem; }
.statgrid > div { display: flex; flex-direction: column; }
.statgrid .k { font-size: .72rem; color: var(--muted); text-transform: uppercase; letter-spacing: .03em; }
.statgrid .v { font-weight: 600; }
.ops { display: flex; align-items: center; gap: .5rem; margin-top: 1rem; flex-wrap: wrap; }

.pill { font-size: .65rem; background: var(--pill); color: var(--ok); padding: .1rem .5rem;
  border-radius: 999px; vertical-align: middle; }
.badge-ok { color: var(--ok); } .badge-bad { color: var(--danger); } .badge-warn { color: var(--warn); }

.issues { list-style: none; margin: 0; padding: 0; max-height: 260px; overflow: auto; }
.issues li { padding: .4rem 0; border-bottom: 1px solid var(--line); font-size: .9rem; }
.issues .id { font-weight: 650; color: var(--accent); }
.issues .meta { color: var(--muted); font-size: .78rem; }

.feed { height: 300px; overflow: auto; border: 1px solid var(--line); border-radius: 8px;
  padding: .6rem; background: var(--bg); display: flex; flex-direction: column; gap: .5rem; }
.msg { display: flex; flex-direction: column; }
.msg .who { font-size: .72rem; color: var(--muted); }
.msg .body { white-space: pre-wrap; word-break: break-word; }
.msg.mine { align-items: flex-end; }
.msg.mine .body { background: var(--pill); border-radius: 10px; padding: .35rem .6rem; }
.send { display: flex; gap: .5rem; margin-top: .6rem; }
.send button { flex: none; }

.logs { background: var(--code); border: 1px solid var(--line); border-radius: 8px; padding: .6rem;
  height: 260px; overflow: auto; font: 12px/1.5 ui-monospace, SFMono-Regular, Menlo, monospace;
  white-space: pre-wrap; word-break: break-word; margin: 0; }
.logs.small { height: 140px; }

.users { width: 100%; border-collapse: collapse; font-size: .9rem; }
.users th, .users td { text-align: left; padding: .4rem .5rem; border-bottom: 1px solid var(--line); }
.adduser { display: flex; gap: .5rem; margin-top: .8rem; flex-wrap: wrap; }
.adduser input { width: auto; flex: 1 1 140px; } .adduser select, .adduser button { flex: none; }