:root {
  --gs-green:  #22c55e;
  --gs-yellow: #eab308;
  --gs-red:    #ef4444;
  --gs-blue:   #3b82f6;
  --gs-bg:     #0f172a;
  --gs-card:   #1e293b;
  --gs-border: #334155;
  --gs-text:   #e2e8f0;
  --gs-muted:  #94a3b8;
}

body {
  background: var(--gs-bg);
  color: var(--gs-text);
  font-family: 'Inter', system-ui, sans-serif;
  min-height: 100vh;
}

/* ── Navbar ── */
.gs-navbar {
  background: var(--gs-card);
  border-bottom: 1px solid var(--gs-border);
  padding: .75rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.gs-navbar .brand { font-size: 1.25rem; font-weight: 700; color: var(--gs-green); }
.gs-navbar .brand span { color: var(--gs-text); }

/* ── Cards ── */
.gs-card {
  background: var(--gs-card);
  border: 1px solid var(--gs-border);
  border-radius: .75rem;
  padding: 1.25rem;
}

/* ── Stat tiles ── */
.stat-tile { text-align: center; }
.stat-tile .val { font-size: 2rem; font-weight: 700; line-height: 1; }
.stat-tile .lbl { font-size: .75rem; color: var(--gs-muted); margin-top: .25rem; text-transform: uppercase; letter-spacing: .05em; }

/* ── Status badge ── */
.badge-online  { background: rgba(34,197,94,.15);  color: var(--gs-green);  border: 1px solid var(--gs-green);  font-size: .7rem; padding: .2rem .6rem; border-radius: 99px; }
.badge-offline { background: rgba(239,68,68,.15);  color: var(--gs-red);    border: 1px solid var(--gs-red);    font-size: .7rem; padding: .2rem .6rem; border-radius: 99px; }
.badge-warning { background: rgba(234,179,8,.15);  color: var(--gs-yellow); border: 1px solid var(--gs-yellow); font-size: .7rem; padding: .2rem .6rem; border-radius: 99px; }
.badge-info    { background: rgba(59,130,246,.15); color: var(--gs-blue);   border: 1px solid var(--gs-blue);   font-size: .7rem; padding: .2rem .6rem; border-radius: 99px; }

/* ── Fullness bar ── */
.fullness-bar-track { height: 8px; background: var(--gs-border); border-radius: 4px; overflow: hidden; }
.fullness-bar-fill  { height: 100%; border-radius: 4px; transition: width .4s ease; }

/* ── Device card ── */
.device-card { cursor: pointer; transition: border-color .2s; }
.device-card:hover { border-color: var(--gs-green); }

/* ── Alert rows ── */
.alert-row.unread { border-left: 3px solid var(--gs-yellow); }
.alert-row.critical { border-left-color: var(--gs-red); }
.alert-row.info { border-left-color: var(--gs-blue); }

/* ── Login page ── */
.login-wrap { display: flex; align-items: center; justify-content: center; min-height: 100vh; }
.login-box  { width: 100%; max-width: 400px; }

/* ── Form controls ── */
.gs-input {
  background: var(--gs-bg);
  border: 1px solid var(--gs-border);
  color: var(--gs-text);
  border-radius: .5rem;
  padding: .6rem 1rem;
  width: 100%;
  outline: none;
}
.gs-input:focus { border-color: var(--gs-green); }
.gs-btn {
  border: none;
  border-radius: .5rem;
  padding: .65rem 1.4rem;
  font-weight: 600;
  cursor: pointer;
  transition: opacity .15s;
}
.gs-btn:hover { opacity: .85; }
.gs-btn-primary { background: var(--gs-green); color: #000; }
.gs-btn-secondary { background: var(--gs-border); color: var(--gs-text); }
.gs-btn-danger { background: var(--gs-red); color: #fff; }
.gs-btn-sm { padding: .35rem .8rem; font-size: .85rem; }

/* ── Chart container ── */
.chart-wrap { position: relative; height: 260px; }

/* ── Table ── */
.gs-table { width: 100%; border-collapse: collapse; font-size: .875rem; }
.gs-table th { color: var(--gs-muted); font-weight: 500; padding: .5rem .75rem; text-align: left; border-bottom: 1px solid var(--gs-border); }
.gs-table td { padding: .6rem .75rem; border-bottom: 1px solid rgba(51,65,85,.5); }
.gs-table tr:last-child td { border-bottom: none; }

/* ── Spinner ── */
.spinner { display: inline-block; width: 1.5rem; height: 1.5rem; border: 3px solid var(--gs-border); border-top-color: var(--gs-green); border-radius: 50%; animation: spin .7s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

/* ── Alert count badge ── */
.alert-count { background: var(--gs-red); color: #fff; border-radius: 99px; font-size: .7rem; padding: .1rem .45rem; font-weight: 700; }

/* ── Misc ── */
.text-green  { color: var(--gs-green); }
.text-yellow { color: var(--gs-yellow); }
.text-red    { color: var(--gs-red); }
.text-blue   { color: var(--gs-blue); }
.text-muted  { color: var(--gs-muted); }
.mt-1 { margin-top: .5rem; } .mt-2 { margin-top: 1rem; } .mt-3 { margin-top: 1.5rem; }
.mb-1 { margin-bottom: .5rem; } .mb-2 { margin-bottom: 1rem; } .mb-3 { margin-bottom: 1.5rem; }
.gap-2 { gap: .75rem; } .gap-3 { gap: 1.25rem; }
.flex { display: flex; } .flex-col { flex-direction: column; }
.items-center { align-items: center; } .justify-between { justify-content: space-between; }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1rem; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1rem; }
@media (max-width: 640px) { .grid-4 { grid-template-columns: repeat(2, 1fr); } .grid-2 { grid-template-columns: 1fr; } }