:root {
  --bg: #f4f5f9;
  --surface: #fff;
  --border: #e3e6ee;
  --text: #12141c;
  --muted: #6b7280;
  --primary: #2f6fed;
  --ok: #16a34a;
  --warning: #d97706;
  --alarm: #dc2626;
  --offline: #475569;
  --radius: 10px;
}

* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text); font: 15px/1.5 system-ui, -apple-system, "Segoe UI", sans-serif; }
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }
h1 { font-size: 1.5rem; margin: 0 0 1rem; display: flex; align-items: center; gap: .6rem; }
h2 { font-size: 1.1rem; margin: 1.6rem 0 .6rem; }

nav { display: flex; align-items: center; gap: 1.2rem; padding: .8rem 1.5rem; background: var(--surface); border-bottom: 1px solid var(--border); flex-wrap: wrap; }
nav .brand { font-weight: 700; color: var(--text); margin-right: .5rem; }
nav .spacer { flex: 1; }
main { max-width: 1200px; margin: 0 auto; padding: 1.5rem; }

.card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 1.3rem; display: flex; flex-direction: column; gap: .9rem; }
.narrow { max-width: 420px; }
.row { display: flex; align-items: center; justify-content: space-between; gap: 1rem; flex-wrap: wrap; }
.row h1 { margin: 0; }
.actions { display: flex; gap: .5rem; align-items: center; flex-wrap: wrap; }
.grid2 { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: .9rem; }
.grid3 { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: .9rem; }
form.inline { display: inline; }

label { display: flex; flex-direction: column; gap: .3rem; font-size: .9rem; font-weight: 600; }
label.check { flex-direction: row; align-items: center; font-weight: 400; }
input, select { font: inherit; padding: .5rem .6rem; border: 1px solid var(--border); border-radius: 7px; background: #fff; }
input[type="checkbox"] { width: auto; }
fieldset { border: 1px solid var(--border); border-radius: var(--radius); padding: .9rem 1rem 1rem; display: flex; flex-direction: column; gap: .9rem; }
legend { font-weight: 700; font-size: .85rem; color: var(--muted); padding: 0 .3rem; }

button, .button { font: inherit; font-weight: 600; border: 0; border-radius: 7px; padding: .5rem 1rem; background: var(--primary); color: #fff; cursor: pointer; display: inline-block; }
button:hover, .button:hover { filter: brightness(.95); text-decoration: none; }
button:disabled { opacity: .5; cursor: default; }
button.secondary, .button.secondary { background: #eef1f6; color: var(--text); }
button.danger { background: var(--alarm); }
button.link { background: none; color: var(--primary); padding: 0; font-weight: 400; }
.danger-zone { margin-top: 2rem; display: flex; gap: 1rem; align-items: center; }

table { width: 100%; border-collapse: collapse; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; }
th, td { text-align: left; padding: .55rem .8rem; border-bottom: 1px solid var(--border); vertical-align: top; }
th { background: #f8f9fc; font-size: .8rem; text-transform: uppercase; letter-spacing: .03em; color: var(--muted); }
tr:last-child td { border-bottom: 0; }
td.num, th.num { text-align: right; white-space: nowrap; font-variant-numeric: tabular-nums; }

.badge { font-size: .75rem; font-weight: 700; text-transform: uppercase; padding: .15rem .55rem; border-radius: 999px; color: #fff; background: var(--muted); }
.badge-ok { background: var(--ok); }
.badge-warning { background: var(--warning); }
.badge-alarm { background: var(--alarm); }
.badge-offline { background: var(--offline); }
.text-ok { color: var(--ok); }
.text-warning { color: var(--warning); }
.text-alarm { color: var(--alarm); }

.tiles { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: .9rem; margin-bottom: 1.4rem; }
.tile { background: var(--surface); border: 1px solid var(--border); border-left: 5px solid var(--muted); border-radius: var(--radius); padding: .8rem 1rem; display: flex; flex-direction: column; }
.tile strong { font-size: 1.8rem; }
.tile span { color: var(--muted); text-transform: capitalize; }
.tile-ok { border-left-color: var(--ok); }
.tile-warning { border-left-color: var(--warning); }
.tile-alarm { border-left-color: var(--alarm); }
.tile-offline { border-left-color: var(--offline); }

.flash { background: #dcfce7; color: #14532d; padding: .7rem 1rem; border-radius: var(--radius); margin-bottom: 1rem; }
.error { background: #fee2e2; color: #7f1d1d; padding: .7rem 1rem; border-radius: var(--radius); margin-bottom: 1rem; }
.muted { color: var(--muted); }
.small { font-size: .82rem; }

@media (max-width: 700px) {
  main { padding: 1rem; }
  table { display: block; overflow-x: auto; }
}