:root {
  --bg: #0d1117;
  --surface: #161b22;
  --surface2: #21262d;
  --border: #30363d;
  --text: #e6edf3;
  --muted: #8b949e;
  --accent: #1f6feb;
  --accent-light: #388bfd;
  --positive: #3fb950;
  --negative: #f85149;
  --warning: #d29922;
  --font: 'Segoe UI', system-ui, sans-serif;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 14px;
  min-height: 100vh;
}

/* Header */
header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 1rem 2rem;
}
.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.header-brand { display: flex; align-items: center; gap: 1rem; }
.logo { font-size: 2rem; }
h1 { font-size: 1.25rem; font-weight: 600; }
.subtitle { color: var(--muted); font-size: 0.8rem; margin-top: 2px; }
.header-meta { display: flex; align-items: center; gap: 1rem; color: var(--muted); font-size: 0.85rem; }
.badge-live { color: var(--positive); font-size: 0.75rem; font-weight: 600; }

/* Main */
main { max-width: 1200px; margin: 0 auto; padding: 1.5rem 2rem; display: flex; flex-direction: column; gap: 1.5rem; }

/* KPI Cards */
.kpi-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1rem; }
.kpi-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}
.kpi-label { color: var(--muted); font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.05em; }
.kpi-value { font-size: 2rem; font-weight: 700; color: var(--accent-light); }
.kpi-delta { font-size: 0.75rem; color: var(--muted); }
.kpi-delta.positive { color: var(--positive); }
.kpi-delta.negative { color: var(--negative); }

/* Charts */
.charts-grid { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 1rem; }
.chart-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.25rem;
}
.chart-card.wide { grid-column: span 1; }
.chart-card h2 { font-size: 0.85rem; font-weight: 600; color: var(--muted); margin-bottom: 1rem; text-transform: uppercase; letter-spacing: 0.05em; }

/* Alerts */
.alerts-section { background: var(--surface); border: 1px solid var(--border); border-radius: 8px; padding: 1.25rem; }
.alerts-section h2 { font-size: 0.9rem; font-weight: 600; margin-bottom: 1rem; }
table { width: 100%; border-collapse: collapse; font-size: 0.85rem; }
thead tr { border-bottom: 1px solid var(--border); }
th { text-align: left; padding: 0.5rem 0.75rem; color: var(--muted); font-weight: 500; font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.05em; }
td { padding: 0.6rem 0.75rem; border-bottom: 1px solid var(--surface2); }
tbody tr:hover { background: var(--surface2); }
.status-pill {
  display: inline-block;
  padding: 2px 10px;
  border-radius: 20px;
  font-size: 0.7rem;
  font-weight: 600;
}
.status-critical { background: rgba(248,81,73,0.15); color: var(--negative); }
.status-warning { background: rgba(210,153,34,0.15); color: var(--warning); }
.status-ok { background: rgba(63,185,80,0.15); color: var(--positive); }