:root {
  --bg: #0f1420;
  --bg-elev: #161d2c;
  --surface: #ffffff;
  --page: #f4f6fa;
  --border: #e3e8f0;
  --text: #1b2230;
  --muted: #6b7789;
  --accent: #2f6df6;
  --ok: #12a26b;
  --alerta: #e0a106;
  --critico: #dc3545;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--page);
  color: var(--text);
  font-size: 14px;
}

/* ---------------------------------------------------------------- layout */

.shell { display: flex; min-height: 100vh; }

.sidebar {
  width: 236px;
  flex: 0 0 236px;
  background: var(--bg);
  color: #c7d0e0;
  padding: 20px 14px;
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
}
.sidebar nav { flex: 1; }

.sidebar-user {
  margin-top: 14px; padding: 12px 10px;
  border-top: 1px solid #232c3f;
  display: flex; align-items: center; justify-content: space-between; gap: 8px;
}
.sidebar-user-nombre strong { display: block; color: #fff; font-size: 13px; }
.sidebar-user-nombre small { color: #7d8aa1; font-size: 11px; }
.btn-salir {
  padding: 6px 12px; border: 1px solid #2c3650; border-radius: 7px;
  background: transparent; color: #c7d0e0; font-size: 12px; cursor: pointer;
}
.btn-salir:hover { background: var(--bg-elev); color: #fff; }

.brand { display: flex; gap: 10px; align-items: center; margin-bottom: 26px; }
.brand-mark {
  width: 36px; height: 36px;
  display: grid; place-items: center;
  background: var(--accent);
  border-radius: 9px;
  font-weight: 700; color: #fff; letter-spacing: .5px;
}
.brand strong { display: block; color: #fff; font-size: 15px; }
.brand small { color: #7d8aa1; font-size: 11px; }

.nav-title {
  font-size: 10px; text-transform: uppercase; letter-spacing: .09em;
  color: #5d6b83; margin: 18px 0 6px 10px;
}

.nav-item {
  display: flex; align-items: center; gap: 9px;
  padding: 9px 10px; margin-bottom: 2px;
  border-radius: 7px;
  color: #c7d0e0; text-decoration: none; font-size: 13px;
}
.nav-item:hover { background: var(--bg-elev); color: #fff; }
.nav-item.is-active { background: var(--accent); color: #fff; }
.nav-item .dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: currentColor; opacity: .55;
}

.content { flex: 1; display: flex; flex-direction: column; min-width: 0; }

.topbar {
  display: flex; justify-content: space-between; align-items: flex-end;
  gap: 20px; flex-wrap: wrap;
  padding: 20px 26px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}
.topbar h1 { margin: 0; font-size: 20px; }
.topbar .sub { margin: 3px 0 0; color: var(--muted); font-size: 12px; }

.page { padding: 22px 26px; flex: 1; }

.pie {
  padding: 12px 26px; border-top: 1px solid var(--border);
  color: var(--muted); font-size: 12px; background: var(--surface);
}

/* --------------------------------------------------------------- filtros */

.filtros { display: flex; gap: 12px; align-items: flex-end; flex-wrap: wrap; }
.campo { display: flex; flex-direction: column; gap: 4px; }
.campo span { font-size: 11px; color: var(--muted); }

input.fecha {
  width: 132px; padding: 7px 10px;
  border: 1px solid var(--border); border-radius: 7px;
  background: #fff; font-size: 13px; color: var(--text);
  cursor: pointer;
}
input.fecha:focus { outline: 2px solid var(--accent); outline-offset: -1px; }

select.select {
  padding: 7px 10px; min-width: 150px;
  border: 1px solid var(--border); border-radius: 7px;
  background: #fff; font-size: 13px; color: var(--text);
  cursor: pointer;
}
select.select:focus { outline: 2px solid var(--accent); outline-offset: -1px; }

.btn {
  padding: 8px 15px; border: 0; border-radius: 7px;
  background: var(--accent); color: #fff; font-size: 13px;
  cursor: pointer;
}
.btn:hover { filter: brightness(1.07); }
.btn[disabled] { opacity: .55; cursor: default; }

.btn-mini {
  padding: 4px 10px; font-size: 12px;
  background: #eef1f6; color: var(--text);
}
.btn-mini:hover { filter: none; background: #e3e8f0; }

.auto { display: flex; align-items: center; gap: 6px; font-size: 12px; color: var(--muted); }

/* -------------------------------------------------------------- tarjetas */

.grid { display: grid; gap: 16px; }
.grid.cols-2 { grid-template-columns: repeat(auto-fit, minmax(360px, 1fr)); }
.grid.cols-3 { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
.grid.cols-4 { grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); }

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 11px;
  padding: 16px 18px;
}
.card h2 { margin: 0 0 3px; font-size: 15px; }
.card h3 { margin: 0 0 12px; font-size: 13px; color: var(--muted); font-weight: 600; }
.card .meta { color: var(--muted); font-size: 11px; margin: 0 0 14px; }

.kpi { font-size: 26px; font-weight: 650; letter-spacing: -.5px; }
.kpi small { font-size: 12px; font-weight: 500; color: var(--muted); margin-left: 4px; }
.kpi-label { font-size: 11px; color: var(--muted); text-transform: uppercase; letter-spacing: .06em; }

.estado-ok { color: var(--ok); }
.estado-alerta { color: var(--alerta); }
.estado-critico { color: var(--critico); }

.chip {
  display: inline-block; padding: 2px 9px; border-radius: 99px;
  font-size: 11px; font-weight: 600;
}
.chip.estado-ok { background: rgba(18, 162, 107, .12); }
.chip.estado-alerta { background: rgba(224, 161, 6, .14); }
.chip.estado-critico { background: rgba(220, 53, 69, .12); }
.chip.neutro { background: #eef1f6; color: var(--muted); }

/* --------------------------------------------------------------- tablas */

table { width: 100%; border-collapse: collapse; font-size: 13px; }
th, td { padding: 8px 10px; text-align: left; border-bottom: 1px solid var(--border); }
th {
  font-size: 11px; text-transform: uppercase; letter-spacing: .05em;
  color: var(--muted); font-weight: 600; white-space: nowrap;
}
td.num, th.num { text-align: right; font-variant-numeric: tabular-nums; }
tbody tr:hover { background: #fafbfd; }

.tabla-scroll { overflow-x: auto; }

/* --------------------------------------------------------------- varios */

.chart-wrap { position: relative; height: 240px; }

.aviso {
  border: 1px solid #f3d99b;
  background: #fdf6e6;
  color: #7a5b09;
  border-radius: 9px;
  padding: 13px 15px;
  margin-bottom: 16px;
  font-size: 13px;
  line-height: 1.5;
}
.aviso strong { display: block; margin-bottom: 3px; }
.aviso code { background: rgba(0,0,0,.05); padding: 1px 5px; border-radius: 4px; }

.error {
  border: 1px solid #f2c2c7; background: #fdf0f1; color: #96242f;
  border-radius: 9px; padding: 13px 15px; font-size: 13px;
}

.vacio { color: var(--muted); text-align: center; padding: 26px; font-size: 13px; }

.cargando { color: var(--muted); font-size: 13px; padding: 20px 0; }

/* --------------------------------------------------------------- tanques */

.estacion-head {
  display: flex; justify-content: space-between; align-items: flex-start;
  gap: 14px; flex-wrap: wrap; margin-bottom: 14px;
}

.tanques-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 14px;
}

.tanque-card {
  display: flex; gap: 16px; align-items: flex-start;
  border: 1px solid var(--border); border-radius: 11px;
  padding: 14px;
  border-left-width: 4px;
}
.estado-borde-ok { border-left-color: var(--ok); }
.estado-borde-alerta { border-left-color: var(--alerta); }
.estado-borde-critico { border-left-color: var(--critico); }

.tanque-svg { width: 104px; flex: 0 0 104px; }
.tanque-pct {
  font: 700 20px -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  fill: #fff;
}
.tanque-pct.oscuro { fill: var(--text); }

.tanque-info { flex: 1; min-width: 0; }
.tanque-info h3 { margin: 0 0 2px; font-size: 14px; letter-spacing: .02em; }

.tanque-litros { font-size: 22px; font-weight: 650; letter-spacing: -.4px; }
.tanque-litros small { font-size: 12px; font-weight: 500; color: var(--muted); }

.tanque-detalle { margin-top: 8px; font-size: 12px; }
.tanque-detalle td { padding: 2px 0; border: 0; }
.tanque-detalle td:first-child { color: var(--muted); padding-right: 12px; }
.tanque-detalle td:last-child { text-align: right; font-variant-numeric: tabular-nums; }

.tanque-chips { display: flex; gap: 6px; flex-wrap: wrap; margin-top: 8px; }