:root {
  --bg: #f4f5f7;
  --card: #ffffff;
  --border: #e3e6ea;
  --text: #1c2430;
  --muted: #6b7684;
  --accent: #2f6feb;
  --ok: #23a06b;
  --warn: #e0a23a;
  --crit: #db4a4a;
  --track: #eceef1;
  --shadow: 0 1px 3px rgba(20, 30, 45, .07), 0 1px 2px rgba(20, 30, 45, .04);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #12151a;
    --card: #1b1f27;
    --border: #2a303b;
    --text: #e6eaf0;
    --muted: #8b94a3;
    --accent: #5b8def;
    --ok: #37b784;
    --warn: #e6b45a;
    --crit: #ef6a6a;
    --track: #262c36;
    --shadow: none;
  }
}

* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  line-height: 1.45;
}

/* ── topbar ─────────────────────────────────────────────────────────────── */
.topbar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 24px;
  background: var(--card);
  border-bottom: 1px solid var(--border);
  position: sticky; top: 0; z-index: 5;
}
.brand { font-weight: 700; font-size: 1.15rem; letter-spacing: .3px; }
.topbar-right { display: flex; align-items: center; gap: 16px; }
.logout { color: var(--muted); text-decoration: none; font-size: .9rem; }
.logout:hover { color: var(--text); }

main { max-width: 1180px; margin: 0 auto; padding: 24px; }
.section-title { font-size: .82rem; text-transform: uppercase; letter-spacing: .08em;
  color: var(--muted); margin: 8px 0 14px; }
.muted { color: var(--muted); font-size: .85rem; }

/* ── grid + karty ───────────────────────────────────────────────────────── */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(310px, 1fr));
  gap: 16px;
  margin-bottom: 28px;
}
.group-title { grid-column: 1 / -1;   /* nadpis skupiny zabírá celý řádek gridu */
  margin: 8px 0 -4px; font-size: .9rem; font-weight: 650; }
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 18px;
  box-shadow: var(--shadow);
}
.card-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 14px; }
.card-title { font-weight: 650; font-size: 1.02rem; }
.card-sub { font-size: .78rem; color: var(--muted); }

/* stavový puntík / badge */
.badge { display: inline-flex; align-items: center; gap: 6px; font-size: .78rem;
  font-weight: 600; padding: 3px 9px; border-radius: 999px; }
.badge.online, .badge.up { background: color-mix(in srgb, var(--ok) 16%, transparent); color: var(--ok); }
.badge.offline, .badge.down { background: color-mix(in srgb, var(--crit) 16%, transparent); color: var(--crit); }
.dot { width: 7px; height: 7px; border-radius: 50%; background: currentColor; }

/* ── metriky ────────────────────────────────────────────────────────────── */
.metric { margin: 12px 0; }
.metric-row { display: flex; justify-content: space-between; font-size: .86rem; margin-bottom: 5px; }
.metric-row .val { font-variant-numeric: tabular-nums; font-weight: 600; }
.bar { height: 8px; background: var(--track); border-radius: 6px; overflow: hidden; }
.bar > span { display: block; height: 100%; border-radius: 6px; transition: width .4s ease; }
.bar > span.ok { background: var(--ok); }
.bar > span.warn { background: var(--warn); }
.bar > span.crit { background: var(--crit); }

.disks { margin-top: 6px; }
.disk-mount { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: .8rem; }

.spark { display: block; width: 100%; height: 40px; margin-top: 8px; }
.spark-label { font-size: .72rem; color: var(--muted); margin-top: 10px; }

.load-figures { display: flex; gap: 16px; font-variant-numeric: tabular-nums; }
.load-figures div span { display: block; font-size: .72rem; color: var(--muted); }
.load-figures div b { font-size: 1.05rem; }

.empty { color: var(--muted); padding: 24px; text-align: center;
  border: 1px dashed var(--border); border-radius: 12px; }

/* ── login ──────────────────────────────────────────────────────────────── */
.login-page { display: grid; place-items: center; min-height: 100vh; }
.login-card {
  background: var(--card); border: 1px solid var(--border); border-radius: 14px;
  padding: 32px; width: 300px; text-align: center; box-shadow: var(--shadow);
}
.login-card h1 { margin: 0; font-size: 1.5rem; }
.login-card input {
  width: 100%; padding: 11px 12px; margin-top: 18px; font-size: 1rem;
  border: 1px solid var(--border); border-radius: 8px; background: var(--bg); color: var(--text);
}
.login-card button {
  width: 100%; padding: 11px; margin-top: 12px; font-size: 1rem; font-weight: 600;
  border: none; border-radius: 8px; background: var(--accent); color: #fff; cursor: pointer;
}
.login-card button:hover { filter: brightness(1.05); }
.error { color: var(--crit); font-size: .88rem; margin: 12px 0 0; }