/* ===== RESET Y BASE ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --azul:       #1a6fa0;
  --azul-claro: #2196f3;
  --verde:      #2e7d32;
  --rojo:       #c62828;
  --amarillo:   #f57f17;
  --gris-fondo: #f0f4f8;
  --gris-card:  #ffffff;
  --gris-borde: #dde3ea;
  --texto:      #1c2b3a;
  --texto-sub:  #607d8b;
  --sombra:     0 2px 8px rgba(0,0,0,0.08);
}

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: var(--gris-fondo);
  color: var(--texto);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ===== HEADER ===== */
header {
  background: linear-gradient(135deg, #1a3a5c, #1a6fa0);
  color: white;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  box-shadow: 0 2px 12px rgba(0,0,0,0.2);
}

.logo { display: flex; align-items: center; gap: 12px; text-decoration: none; color: inherit; }
.logo-icon { font-size: 2rem; }
.logo h1 { font-size: 1.5rem; font-weight: 700; letter-spacing: 1px; }
.logo p  { font-size: 0.75rem; opacity: 0.8; margin-top: 2px; }

.planta-badge {
  background: rgba(255,255,255,0.15);
  border: 1px solid rgba(255,255,255,0.3);
  border-radius: 20px;
  padding: 6px 16px;
  font-size: 0.9rem;
  font-weight: 600;
}
.punto { color: #69f0ae; animation: pulso 2s infinite; }

/* NAV TABS (compartido con mapa) */
.nav-tabs { display: flex; gap: 8px; }
.nav-tab {
  color: rgba(255,255,255,0.75);
  text-decoration: none;
  font-size: 0.85rem;
  font-weight: 600;
  padding: 6px 14px;
  border-radius: 20px;
  border: 1px solid rgba(255,255,255,0.2);
  transition: all 0.2s;
}
.nav-tab:hover, .nav-tab.activo {
  background: rgba(255,255,255,0.2);
  color: white;
}
@keyframes pulso { 0%,100% { opacity:1; } 50% { opacity:0.3; } }

.header-right { text-align: right; display: flex; flex-direction: column; align-items: flex-end; gap: 4px; }
#hora  { font-size: 1.4rem; font-weight: 700; font-family: monospace; }
#fecha { font-size: 0.75rem; opacity: 0.8; }

.conexion { font-size: 0.75rem; display: flex; align-items: center; gap: 5px; opacity: 0.9; }
.dot { width: 8px; height: 8px; border-radius: 50%; display: inline-block; }
.dot.conectado    { background: #69f0ae; box-shadow: 0 0 6px #69f0ae; }
.dot.desconectado { background: #ef5350; }

/* Widget de usuario — aparece en el header-right de todas las páginas */
.usuario-widget {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 2px;
}

.usuario-nombre {
  font-size: 0.75rem;
  color: rgba(255,255,255,0.7);
  max-width: 120px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.btn-logout {
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.15);
  border-radius: 6px;
  color: rgba(255,255,255,0.6);
  font-size: 0.85rem;
  padding: 2px 8px;
  cursor: pointer;
  transition: background 0.2s, color 0.2s;
  line-height: 1.6;
}

.btn-logout:hover {
  background: rgba(239,83,80,0.25);
  color: #ef9a9a;
  border-color: rgba(239,83,80,0.4);
}

/* ===== TARJETAS DE SENSORES ===== */
.sensores {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 14px;
  padding: 20px 24px 0;
}

.tarjeta {
  background: var(--gris-card);
  border-radius: 12px;
  padding: 16px;
  box-shadow: var(--sombra);
  border-left: 4px solid var(--gris-borde);
  display: flex;
  flex-direction: column;
  gap: 8px;
  transition: border-color 0.3s, box-shadow 0.3s;
}
.tarjeta.normal   { border-left-color: var(--verde); }
.tarjeta.alerta   { border-left-color: var(--rojo); box-shadow: 0 2px 12px rgba(198,40,40,0.15); }
.tarjeta.pendiente { border-left-color: #bdbdbd; opacity: 0.65; }
.tarjeta-estado.pendiente { background: #f5f5f5; color: #9e9e9e; }

.tarjeta-icono { font-size: 1.6rem; }
.tarjeta-label { font-size: 0.75rem; font-weight: 600; color: var(--texto-sub); text-transform: uppercase; letter-spacing: 0.5px; }
.tarjeta-valor { font-size: 2rem; font-weight: 700; color: var(--azul); line-height: 1; }
.tarjeta-valor .unidad { font-size: 0.9rem; font-weight: 500; color: var(--texto-sub); margin-left: 2px; }
.tarjeta-sub   { font-size: 0.7rem; color: var(--texto-sub); }

.tarjeta-estado {
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  padding: 3px 8px;
  border-radius: 10px;
  align-self: flex-start;
  background: #f5f5f5;
  color: var(--texto-sub);
}
.tarjeta-estado.normal { background: #e8f5e9; color: var(--verde); }
.tarjeta-estado.alerta { background: #ffebee; color: var(--rojo); }

/* ===== BARRA SISTEMA + TOGGLE VISTA ===== */
.sistema-barra {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 24px;
  background: var(--gris-card);
  border-bottom: 1px solid var(--gris-borde);
  gap: 12px;
  flex-wrap: wrap;
}
.sistema-selector {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}
.sistema-selector-label { font-size: .82rem; color: var(--texto-sub); font-weight: 600; }
.sistema-activo-banner {
  grid-column: 1 / -1;
  width: 100%;
  padding: 6px 16px;
  border-radius: 8px;
  font-size: .82rem;
  font-weight: 700;
  letter-spacing: .04em;
  color: white;
  background: var(--azul);
  margin-bottom: 4px;
}
.sistema-btns { display: flex; gap: 6px; flex-wrap: wrap; }
.sistema-btn {
  padding: 5px 14px;
  border-radius: 20px;
  border: 2px solid #ccc;
  background: white;
  font-size: .82rem;
  font-weight: 600;
  cursor: pointer;
  transition: all .2s;
}
.vista-toggle { display: flex; gap: 4px; }
.vista-btn {
  padding: 5px 12px;
  border-radius: 6px;
  border: 1px solid var(--gris-borde);
  background: white;
  font-size: .8rem;
  cursor: pointer;
  color: var(--texto-sub);
  transition: all .15s;
}
.vista-btn.activo {
  background: var(--azul);
  color: white;
  border-color: var(--azul);
}

/* ===== VISTA DIVIDIDA ===== */
.split-layout {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 0;
  border-bottom: 1px solid var(--gris-borde);
}
.split-sistema {
  padding: 14px 18px;
  border-right: 1px solid var(--gris-borde);
}
.split-sistema:last-child { border-right: none; }
.split-sistema-titulo {
  font-size: .82rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .5px;
  padding: 0 0 8px;
  margin-bottom: 10px;
  border-bottom: 3px solid currentColor;
}
.split-sensores {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
  gap: 8px;
}
.split-tarjeta {
  background: var(--gris-fondo);
  border-radius: 8px;
  padding: 10px;
  border-left: 3px solid var(--gris-borde);
}
.split-tarjeta.normal { border-left-color: var(--verde); }
.split-tarjeta.alerta { border-left-color: var(--rojo); background: #fff8f8; }
.split-tarjeta-label { font-size: .72rem; color: var(--texto-sub); margin-bottom: 2px; }
.split-tarjeta-valor { font-size: 1.1rem; font-weight: 700; color: var(--texto); }
.split-tarjeta-unidad { font-size: .72rem; color: var(--texto-sub); }
.split-tarjeta-estado { font-size: .7rem; margin-top: 2px; }
.split-tarjeta-estado.normal { color: var(--verde); }
.split-tarjeta-estado.alerta { color: var(--rojo); }

/* ===== GRÁFICAS POR SISTEMA ===== */
#graficas-container {
  padding: 14px 24px 0;
  display: flex;
  flex-direction: column;
  gap: 22px;
}
.graficas-sistema {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.graficas-sistema-titulo {
  font-size: 0.82rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.6px;
  padding: 6px 12px;
  border-left: 4px solid currentColor;
  background: var(--gris-fondo);
  border-radius: 0 6px 6px 0;
}
.graficas-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}
.grafica-card.grafica-caudal {
  grid-column: 1 / -1;
}
.grafica-card {
  background: var(--gris-card);
  border-radius: 12px;
  padding: 16px;
  box-shadow: var(--sombra);
}
.grafica-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 10px;
}
.grafica-card h3 {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--texto-sub);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin: 0;
}
.grafica-norma {
  font-size: .72rem;
  color: var(--verde);
  font-weight: 600;
}
.grafica-card canvas { max-height: 180px; }
.grafica-card.grafica-caudal canvas { max-height: 200px; }

/* ===== ALERTAS ===== */
.alertas-panel {
  background: var(--gris-card);
  border-radius: 12px;
  margin: 14px 24px 0;
  padding: 16px;
  box-shadow: var(--sombra);
}
.alertas-panel h3 {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--texto-sub);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 10px;
}

#alertas-lista {
  display: flex;
  flex-direction: column;
  gap: 6px;
  max-height: 140px;
  overflow-y: auto;
}

.alerta-item {
  font-size: 0.78rem;
  padding: 6px 12px;
  border-radius: 6px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.alerta-item.normal { background: #e8f5e9; color: #1b5e20; border-left: 3px solid var(--verde); }
.alerta-item.alerta { background: #ffebee; color: #b71c1c; border-left: 3px solid var(--rojo); }
.alerta-item.info   { background: #e3f2fd; color: #0d47a1; border-left: 3px solid var(--azul-claro); }


/* ===== TANQUES ===== */
.tanques-seccion {
  margin: 14px 24px 0;
}

.seccion-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
}
.seccion-header h2 {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--texto-sub);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.fase-filtros { display: flex; gap: 6px; }
.fase-btn {
  font-size: 0.72rem;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: 12px;
  border: 1px solid var(--gris-borde);
  background: white;
  color: var(--texto-sub);
  cursor: pointer;
  transition: all 0.2s;
}
.fase-btn.activo, .fase-btn:hover {
  background: var(--azul);
  color: white;
  border-color: var(--azul);
}

.tanques-grid {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 10px;
}

/* Tarjeta de tanque */
.tanque-card {
  background: white;
  border-radius: 12px;
  padding: 12px 10px;
  box-shadow: var(--sombra);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  transition: all 0.3s;
  border-top: 3px solid var(--gris-borde);
}
.tanque-card.normal  { border-top-color: var(--azul-claro); }
.tanque-card.bajo    { border-top-color: var(--amarillo); }
.tanque-card.critico { border-top-color: var(--rojo); box-shadow: 0 2px 12px rgba(198,40,40,0.15); }
.tanque-card.lleno   { border-top-color: var(--verde); }

.tanque-nombre {
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--texto);
  text-align: center;
  line-height: 1.2;
}
.tanque-fase-badge {
  font-size: 0.62rem;
  color: var(--texto-sub);
  background: var(--gris-fondo);
  padding: 1px 6px;
  border-radius: 8px;
}

/* Dibujo del tanque */
.tanque-visual {
  width: 48px;
  height: 72px;
  border: 2px solid #b0bec5;
  border-radius: 4px 4px 6px 6px;
  background: #eceff1;
  position: relative;
  overflow: hidden;
}
.tanque-agua {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  transition: height 1s ease, background-color 0.5s;
  border-radius: 0 0 4px 4px;
}
.tanque-card.normal  .tanque-agua { background: linear-gradient(180deg, #64b5f6, #1565c0); }
.tanque-card.bajo    .tanque-agua { background: linear-gradient(180deg, #ffcc02, #f57f17); }
.tanque-card.critico .tanque-agua { background: linear-gradient(180deg, #ef9a9a, #c62828); }
.tanque-card.lleno   .tanque-agua { background: linear-gradient(180deg, #a5d6a7, #2e7d32); }

.tanque-pct {
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--texto);
}

.tanque-litros {
  font-size: 0.65rem;
  color: var(--texto-sub);
  text-align: center;
  line-height: 1.3;
}

.tanque-estado-label {
  font-size: 0.62rem;
  font-weight: 700;
  text-transform: uppercase;
  padding: 2px 7px;
  border-radius: 8px;
}
.tanque-card.normal  .tanque-estado-label { background: #e3f2fd; color: #1565c0; }
.tanque-card.bajo    .tanque-estado-label { background: #fff8e1; color: #e65100; }
.tanque-card.critico .tanque-estado-label { background: #ffebee; color: #b71c1c; }
.tanque-card.lleno   .tanque-estado-label { background: #e8f5e9; color: #1b5e20; }

/* ===== ANC — AGUA NO CONTABILIZADA ===== */
.anc-seccion {
  margin: 0 24px 16px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.anc-grid {
  display: grid;
  grid-template-columns: 160px 1fr 220px;
  gap: 12px;
  align-items: stretch;
}

/* Tarjeta principal ANC */
.anc-principal {
  background: var(--gris-card);
  border-radius: 14px;
  box-shadow: var(--sombra);
  padding: 20px 14px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  text-align: center;
  border-top: 5px solid var(--azul);
  transition: border-color 0.4s;
}
.anc-principal.bueno   { border-color: var(--verde); }
.anc-principal.regular { border-color: var(--amarillo); }
.anc-principal.critico { border-color: var(--rojo); }

.anc-icono { font-size: 2rem; }
.anc-pct {
  font-size: 2.6rem;
  font-weight: 900;
  color: var(--azul);
  line-height: 1;
}
.anc-principal.bueno   .anc-pct { color: var(--verde); }
.anc-principal.regular .anc-pct { color: var(--amarillo); }
.anc-principal.critico .anc-pct { color: var(--rojo); }

.anc-label {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--texto-sub);
  letter-spacing: 0.4px;
}
.anc-meta {
  font-size: 0.7rem;
  color: var(--texto-sub);
  line-height: 1.4;
}

/* Métricas secundarias */
.anc-metricas {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
}

.anc-metrica {
  background: var(--gris-card);
  border-radius: 12px;
  box-shadow: var(--sombra);
  padding: 14px 16px;
  display: flex;
  flex-direction: column;
  gap: 5px;
  border-left: 4px solid #b0bec5;
}
.anc-metrica.perdida { border-color: var(--rojo); }

.anc-met-label {
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--texto-sub);
  text-transform: uppercase;
}
.anc-met-valor {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--texto);
}
.anc-metrica.perdida .anc-met-valor { color: var(--rojo); }
.anc-met-sub {
  font-size: 0.7rem;
  color: var(--texto-sub);
}

/* Zonas */
.anc-zonas {
  background: var(--gris-card);
  border-radius: 12px;
  box-shadow: var(--sombra);
  padding: 14px 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.anc-zonas-titulo {
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--texto-sub);
  text-transform: uppercase;
  margin-bottom: 2px;
}
.anc-zona-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 8px;
  font-size: 0.77rem;
}
.anc-zona-nombre { color: var(--texto); font-weight: 600; }
.anc-zona-valor  { color: var(--texto-sub); }
.anc-zona-barra-bg {
  flex: 1;
  height: 6px;
  background: #eceff1;
  border-radius: 4px;
  overflow: hidden;
}
.anc-zona-barra-fill {
  height: 100%;
  background: var(--azul);
  border-radius: 4px;
  transition: width 0.6s ease;
}

.anc-periodo {
  font-size: 0.75rem;
  font-weight: 600;
  background: #e3f2fd;
  color: var(--azul);
  padding: 4px 12px;
  border-radius: 12px;
}

/* Contenedor multi-sistema ANC */
#anc-sistemas-container {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.anc-cargando {
  font-size: 0.82rem;
  color: var(--texto-sub);
  font-style: italic;
  padding: 8px 0;
}

/* Bloque ANC por sistema */
.anc-sistema-bloque {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.anc-sistema-titulo {
  font-size: 0.82rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.6px;
  padding: 6px 12px;
  border-left: 4px solid currentColor;
  background: var(--gris-fondo);
  border-radius: 0 6px 6px 0;
}

.skeleton { color: var(--texto-sub); font-size: 0.8rem; font-style: italic; }

/* ===== PÁGINA HISTORIAL ===== */

.hist-page {
  max-width: 1400px;
  margin: 0 auto;
  padding: 20px 24px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

/* Tabs principales */
.hist-tabs-nav {
  display: flex;
  gap: 6px;
  border-bottom: 2px solid var(--gris-borde);
  padding-bottom: 0;
}
.hist-tab-btn {
  padding: 8px 22px;
  border: none;
  background: none;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--texto-sub);
  cursor: pointer;
  border-bottom: 3px solid transparent;
  margin-bottom: -2px;
  border-radius: 6px 6px 0 0;
  transition: color 0.2s, border-color 0.2s;
}
.hist-tab-btn:hover { color: var(--azul); }
.hist-tab-btn.activo { color: var(--azul); border-bottom-color: var(--azul); background: #f0f7ff; }

.hist-tab-panel { display: flex; flex-direction: column; gap: 16px; }

/* Barra de filtros */
.hist-filtros-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  gap: 12px;
  background: var(--blanco);
  border: 1px solid var(--gris-borde);
  border-radius: 10px;
  padding: 14px 18px;
}
.hist-filtro-grupo {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.hist-filtro-grupo label {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--texto-sub);
}
.hist-filtro-grupo select,
.hist-filtro-grupo input[type="month"],
.hist-filtro-grupo input[type="date"] {
  padding: 6px 10px;
  border: 1px solid var(--gris-borde);
  border-radius: 6px;
  font-size: 0.85rem;
  color: var(--texto);
  background: var(--blanco);
  min-width: 140px;
}
.hist-btn-buscar {
  padding: 7px 18px;
  background: var(--azul);
  color: white;
  border: none;
  border-radius: 6px;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  margin-top: 18px;
  transition: background 0.2s;
}
.hist-btn-buscar:hover { background: #1255a0; }
.hist-btn-csv {
  padding: 7px 16px;
  background: #2e7d32;
  color: white;
  border: none;
  border-radius: 6px;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  margin-top: 18px;
  transition: background 0.2s;
}
.hist-btn-csv:hover { background: #1b5e20; }

/* Resumen de métricas */
.hist-resumen {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}
.hist-res-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  background: var(--gris-fondo);
  border: 1px solid var(--gris-borde);
  border-radius: 8px;
  padding: 10px 18px;
  min-width: 140px;
}
.hist-res-item.hist-res-bueno   { background: #e8f5e9; border-color: #a5d6a7; }
.hist-res-item.hist-res-regular { background: #fff8e1; border-color: #ffe082; }
.hist-res-item.hist-res-critico { background: #ffebee; border-color: #ef9a9a; }
.hist-res-num {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--texto);
}
.hist-res-lab {
  font-size: 0.72rem;
  color: var(--texto-sub);
  text-align: center;
}

/* Gráfica */
.hist-chart-card {
  background: var(--blanco);
  border: 1px solid var(--gris-borde);
  border-radius: 10px;
  padding: 16px 20px 12px;
}
.hist-chart-titulo {
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--texto-sub);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 8px;
}

/* Tabla */
.hist-tabla-wrap {
  overflow-x: auto;
  background: var(--blanco);
  border: 1px solid var(--gris-borde);
  border-radius: 10px;
}
.hist-tabla {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.83rem;
}
.hist-tabla thead {
  background: var(--gris-fondo);
  position: sticky;
  top: 0;
}
.hist-tabla th {
  padding: 9px 12px;
  text-align: left;
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.4px;
  color: var(--texto-sub);
  border-bottom: 1px solid var(--gris-borde);
  white-space: nowrap;
}
.hist-tabla td {
  padding: 8px 12px;
  border-bottom: 1px solid var(--gris-borde);
  color: var(--texto);
  white-space: nowrap;
}
.hist-tabla tr:last-child td { border-bottom: none; }
.hist-tabla tr:hover td { background: #f5f9ff; }
.hist-fila-alerta td { background: #fff8f8; }
.hist-fila-alerta:hover td { background: #ffebee; }

/* Clases de estado ANC en celdas */
.hist-anc-bueno   { color: #2e7d32; font-weight: 700; }
.hist-anc-regular { color: #f57f17; font-weight: 700; }
.hist-anc-critico { color: #c62828; font-weight: 700; }
.hist-sin-datos   { color: var(--texto-sub); font-style: italic; }

/* Paginación */
.hist-tabla-paginacion { padding: 4px 0; }
.hist-paginacion {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.8rem;
  color: var(--texto-sub);
  padding: 6px 4px;
  gap: 12px;
}
.hist-btn-pag {
  padding: 4px 14px;
  border: 1px solid var(--gris-borde);
  border-radius: 5px;
  background: var(--blanco);
  cursor: pointer;
  font-size: 0.8rem;
  transition: background 0.15s;
}
.hist-btn-pag:hover { background: var(--gris-fondo); }

/* Estado vacío */
.hist-vacio {
  text-align: center;
  color: var(--texto-sub);
  font-size: 0.85rem;
  font-style: italic;
  padding: 40px 0;
}

/* ===== FOOTER ===== */
footer {
  margin-top: auto;
  padding: 12px 24px;
  display: flex;
  justify-content: space-between;
  font-size: 0.7rem;
  color: var(--texto-sub);
  border-top: 1px solid var(--gris-borde);
  margin-top: 14px;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 1400px) {
  .tanques-grid { grid-template-columns: repeat(5, 1fr); }
}
@media (max-width: 1200px) {
  .sensores { grid-template-columns: repeat(3, 1fr); }
  .tanques-grid { grid-template-columns: repeat(4, 1fr); }
}
@media (max-width: 768px) {
  .sensores { grid-template-columns: repeat(2, 1fr); }
  .graficas-grid { grid-template-columns: 1fr; }
  .grafica-card.grafica-caudal { grid-column: 1; }
  .tanques-grid { grid-template-columns: repeat(3, 1fr); }
  .header-center { display: none; }
  .split-layout { grid-template-columns: 1fr; }
  .sistema-barra { flex-direction: column; align-items: flex-start; }
}