:root {
  --brand-blue: #0057B7;
  --brand-dark: #003E82;
  --brand-accent: #FFD700;
  --ink: #1a1a1a;
  --muted: #606060;
  --bg: #f4f6fa;
  --card: #ffffff;
  --border: #dde1ea;
  --err: #a13030;
  --ok: #1d6f3d;
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; background: var(--bg); color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, system-ui, sans-serif;
  line-height: 1.45;
}
a { color: var(--brand-blue); text-decoration: none; }
a:hover { text-decoration: underline; }
code { font-family: "Menlo", "Consolas", monospace; background: rgba(0,0,0,.05); padding: 1px 5px; border-radius: 3px; font-size: .9em; }

header.admin-header {
  background: var(--brand-dark); color: #fff;
  display: flex; align-items: center; gap: 1rem; padding: .7rem 1.2rem;
  position: sticky; top: 0; z-index: 10;
}
header.admin-header img { height: 28px; }
header.admin-header h1 { margin: 0; font-size: 1.15rem; font-weight: 600; letter-spacing: .02em; }
header.admin-header nav { margin-left: auto; display: flex; gap: 1rem; }
header.admin-header nav a { color: #fff; opacity: .8; font-size: .95rem; padding: .3rem .5rem; border-radius: 4px; }
header.admin-header nav a:hover { opacity: 1; background: rgba(255,255,255,.08); text-decoration: none; }
header.admin-header nav a.current { opacity: 1; background: rgba(255,255,255,.14); }
header.admin-header .logout { color: #fff; opacity: .75; font-size: .9rem; cursor: pointer; background: transparent; border: 0; padding: .3rem .6rem; border-radius: 4px; }
header.admin-header .logout:hover { opacity: 1; background: rgba(255,255,255,.08); }

main.admin-main { max-width: 1200px; margin: 0 auto; padding: 1.3rem 1.2rem 2.5rem; }
h2 { margin: 1rem 0 .6rem; color: var(--brand-dark); font-size: 1.4rem; }
h3 { margin: 1.2rem 0 .4rem; color: var(--brand-dark); font-size: 1.1rem; }
.muted { color: var(--muted); }
.fine { color: var(--muted); font-size: .82rem; margin-top: 1.5rem; }

.card {
  background: var(--card); border: 1px solid var(--border); border-radius: 10px;
  padding: 1.1rem 1.2rem; margin-bottom: 1rem;
}
.cards-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 1rem; }
.metric { display: flex; flex-direction: column; gap: .3rem; }
.metric .v { font-size: 2rem; font-weight: 700; color: var(--brand-dark); line-height: 1; }
.metric .k { font-size: .85rem; color: var(--muted); }

table { width: 100%; border-collapse: collapse; background: var(--card); border: 1px solid var(--border); border-radius: 10px; overflow: hidden; }
th, td { padding: .55rem .8rem; text-align: left; border-bottom: 1px solid var(--border); font-size: .93rem; }
th { background: #eef1f7; font-weight: 600; color: var(--brand-dark); }
tr:last-child td { border-bottom: 0; }
td.num, th.num { text-align: right; font-variant-numeric: tabular-nums; }
tr.online td:first-child::before {
  content: "\2022"; color: #2a9e4a; margin-right: .4rem; font-size: 1.2em;
}
tr.offline td:first-child::before {
  content: "\2022"; color: #bbb; margin-right: .4rem; font-size: 1.2em;
}
.empty { padding: 2rem 1rem; text-align: center; color: var(--muted); }

button.btn {
  padding: .55rem 1rem; border: 0; border-radius: 6px; font: inherit; font-weight: 600;
  background: var(--brand-blue); color: #fff; cursor: pointer;
}
button.btn:hover { background: var(--brand-dark); }
button.btn.danger { background: var(--err); }
button.btn.danger:hover { background: #7f2222; }
button.btn:disabled { opacity: .5; cursor: not-allowed; }
.actions { display: flex; gap: .5rem; flex-wrap: wrap; margin: .7rem 0 .2rem; }

.status { margin: .6rem 0; min-height: 1.2em; font-size: .92rem; }
.status.ok { color: var(--ok); }
.status.err { color: var(--err); }
.status.warn { color: #a16a00; }

.kv { display: grid; grid-template-columns: max-content 1fr; gap: .35rem 1rem; font-size: .93rem; }
.kv dt { color: var(--muted); }
.kv dd { margin: 0; font-variant-numeric: tabular-nums; }

/* Login page */
.login-body { min-height: 100vh; display: flex; align-items: center; justify-content: center; background: linear-gradient(135deg, var(--brand-blue) 0%, var(--brand-dark) 100%); margin: 0; }
.login-card { background: var(--card); border-radius: 12px; padding: 2rem 2.2rem 1.8rem; max-width: 420px; width: 100%; box-shadow: 0 20px 60px rgba(0,0,0,.3); }
.login-card .brand { display: flex; align-items: center; gap: .7rem; margin-bottom: 1rem; }
.login-card .brand img { height: 40px; }
.login-card .brand h1 { margin: 0; font-size: 1.4rem; color: var(--brand-dark); }
.login-card form { display: flex; flex-direction: column; gap: .7rem; }
.login-card label { display: flex; flex-direction: column; font-size: .9rem; font-weight: 600; color: var(--ink); }
.login-card input { margin-top: .3rem; padding: .55rem .7rem; font: inherit; border: 1px solid var(--border); border-radius: 6px; }
.login-card button { margin-top: .4rem; padding: .7rem; border: 0; border-radius: 6px; background: var(--brand-blue); color: #fff; font-weight: 700; cursor: pointer; }
.login-card button:hover { background: var(--brand-dark); }