:root {
  --bg: #f7f8fa;
  --surface: #ffffff;
  --surface-2: #f4f5f7;
  --border: #e2e5eb;
  --text: #1a1d26;
  --muted: #6b7280;
  --primary: #4f46e5;
  /* Semáforo (BRIEF): verde #28a745, amarillo #ffc107, rojo #dc3545 */
  --verde: #28a745;
  --amarillo: #ffc107;
  --rojo: #dc3545;
  --radius: 12px;
  --shadow: 0 1px 3px rgba(15, 23, 42, 0.06), 0 1px 2px rgba(15, 23, 42, 0.04);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
  height: 60px;
  border-bottom: 1px solid var(--border);
  background: var(--surface);
  position: sticky;
  top: 0;
  z-index: 10;
}
.brand { display: flex; align-items: center; gap: 10px; }
.brand-mark {
  background: var(--primary);
  color: #fff;
  font-weight: 700;
  border-radius: 6px;
  padding: 3px 8px;
  font-size: 14px;
}
.brand-text { display: flex; flex-direction: column; line-height: 1.25; }
.brand-title { font-weight: 600; }
.brand-sub { font-size: 11px; color: var(--muted); font-weight: 400; }

.topbar-right { display: flex; align-items: center; gap: 12px; }
.refresh-info { font-size: 12px; color: var(--muted); }
.conn-dot { width: 9px; height: 9px; border-radius: 50%; background: var(--muted); display: inline-block; }
.conn-dot.conn-ok { background: var(--verde); }
.conn-dot.conn-bad { background: var(--rojo); animation: pulse 1s infinite; }
@keyframes pulse { 0%,100% { opacity: 1; } 50% { opacity: .35; } }

.tab {
  background: transparent; border: none; color: var(--muted);
  padding: 8px 14px; border-radius: 8px; cursor: pointer; font-size: 14px;
}
.tab:hover { color: var(--text); background: var(--surface-2); }
.tab-logout { color: var(--rojo); }

.container { max-width: 1000px; margin: 0 auto; padding: 24px; }

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 20px;
  box-shadow: var(--shadow);
}
.card-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 6px; }

h2 { margin: 0 0 4px; font-size: 18px; }
h3 { margin: 0; font-size: 15px; }
.muted { color: var(--muted); font-size: 13px; }

.auth-card { max-width: 380px; margin: 60px auto; }
.auth-card input { width: 100%; margin: 12px 0; }
input {
  background: #fff; border: 1px solid var(--border); color: var(--text);
  padding: 10px 12px; border-radius: 8px; font-size: 14px; width: 100%;
}
input:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.12); }

.btn {
  background: #fff; border: 1px solid var(--border); color: var(--text);
  padding: 10px 16px; border-radius: 8px; cursor: pointer; font-size: 14px;
}
.btn:hover { border-color: var(--primary); background: var(--surface-2); }
.btn-primary { background: var(--primary); border-color: var(--primary); color: #fff; }
.btn-primary:hover { background: #4338ca; border-color: #4338ca; }

.error { color: var(--rojo); font-size: 13px; margin-top: 8px; display: none; white-space: pre-wrap; }
.error.show { display: block; }

/* Banner de error de conexión */
.conn-banner {
  background: rgba(220, 53, 69, 0.1);
  color: #b91c1c;
  border: 1px solid rgba(220, 53, 69, 0.25);
  border-radius: 8px;
  padding: 10px 14px;
  margin-bottom: 16px;
  font-size: 14px;
}

/* Hero — estado global grande */
.hero {
  display: flex; align-items: center; gap: 20px;
  border-radius: var(--radius); padding: 26px 28px; margin-bottom: 20px;
  border: 1px solid var(--border); box-shadow: var(--shadow);
  transition: background .3s, border-color .3s;
}
.hero-emoji { font-size: 54px; line-height: 1; }
.hero-title { font-size: 24px; font-weight: 700; }
.hero-sub { font-size: 15px; opacity: .85; margin-top: 2px; }
.hero-verde { background: rgba(40, 167, 69, 0.10); border-color: rgba(40, 167, 69, 0.30); }
.hero-amarillo { background: rgba(255, 193, 7, 0.14); border-color: rgba(255, 193, 7, 0.45); }
.hero-rojo { background: rgba(220, 53, 69, 0.10); border-color: rgba(220, 53, 69, 0.35); }

/* 4 tarjetas de semáforo */
.cards {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; margin-bottom: 20px;
}
.metric-card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 18px 20px; box-shadow: var(--shadow);
  border-left: 4px solid var(--border);
}
.metric-card.alarm { border-left-color: var(--rojo); background: rgba(220, 53, 69, 0.04); }
.metric-label { font-size: 13px; color: var(--muted); font-weight: 500; }
.metric-value { font-size: 38px; font-weight: 700; line-height: 1.1; margin: 6px 0 2px; }
.metric-card.alarm .metric-value { color: var(--rojo); }
.metric-hint { font-size: 12px; color: var(--muted); }

/* Infra */
.infra-card .infra-grid { display: flex; gap: 28px; flex-wrap: wrap; margin-top: 10px; }
.infra-item { display: flex; flex-direction: column; gap: 2px; }
.infra-k { font-size: 12px; color: var(--muted); }
.infra-v { font-size: 18px; font-weight: 600; }
.infra-v.warn { color: #b45309; }
.infra-v.bad { color: var(--rojo); }
.infra-servers { flex: 1; min-width: 220px; }
.infra-row { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; margin-top: 12px; padding-top: 12px; border-top: 1px solid var(--border); }
.infra-row .infra-k { min-width: 96px; }
.srv { font-size: 13px; margin-right: 10px; white-space: nowrap; }
.srv-bad { color: var(--rojo); font-weight: 600; }

/* Tabla de empresas */
.data-table { width: 100%; border-collapse: collapse; margin-top: 10px; font-size: 14px; }
.data-table th { text-align: left; color: var(--muted); font-weight: 500; padding: 8px 10px; border-bottom: 1px solid var(--border); font-size: 12px; }
.data-table td { padding: 9px 10px; border-bottom: 1px solid var(--border); }
.data-table th.num, .data-table td.num { text-align: right; font-variant-numeric: tabular-nums; }
.data-table tbody tr.row-rojo { background: rgba(220, 53, 69, 0.05); }
.data-table tbody tr.row-amarillo { background: rgba(255, 193, 7, 0.07); }
.cell-rojo { color: var(--rojo); font-weight: 700; }
.cell-warn { color: #b45309; font-weight: 600; }
code { background: var(--surface-2); padding: 1px 6px; border-radius: 5px; font-size: 13px; border: 1px solid var(--border); }
.empty-ok { padding: 16px; text-align: center; font-size: 15px; }

.spark-wrap { display: flex; align-items: center; gap: 8px; }
.spark-label { font-size: 11px; }
#spark { display: block; }

.site-footer {
  text-align: center; padding: 20px 24px 28px; font-size: 12px;
  border-top: 1px solid var(--border); margin-top: 8px;
}

@media (max-width: 720px) {
  .cards { grid-template-columns: repeat(2, 1fr); }
  .hero-emoji { font-size: 42px; }
  .hero-title { font-size: 20px; }
}
@media (max-width: 460px) {
  .cards { grid-template-columns: 1fr; }
}