/* =========================================================================
   bernoulli.css — hoja propia del recurso «Redes hidráulicas». Se carga
   DESPUÉS de style.css y recurso.css y solo añade lo que el marco no cubre.

   NOTA: el patrón de pestañas + fichas plegables está duplicado del recurso
   de flotación. Si aparece un tercer recurso que lo use, toca promoverlo a
   recurso.css con nombres compartidos.
   ========================================================================= */
:root {
  --bn-water:  #5AA3B8;          /* agua dentro de depósitos y tuberías */
  --bn-pipe:   #8CA6AC;          /* pared de tubería */
  --bn-node:   #E8A24A;          /* nudos */
  --bn-grade:  #9A8AD0;          /* línea de alturas piezométricas */
  --bn-flow:   #56AEC0;          /* flechas de caudal */
  --bn-ink:    #D8EAEE;
  --bn-wall:   #8CA6AC;
  --bn-bad:    #E4736E;
}
@media (prefers-color-scheme: light) {
  :root:not([data-theme]) {
    --bn-water: #9FD4E0; --bn-pipe: #4C6570; --bn-node: #B5670F;
    --bn-grade: #6A4FA3; --bn-flow: #1C6B7B; --bn-ink: #16404C;
    --bn-wall: #4C6570; --bn-bad: #B33F39;
  }
}
:root[data-theme="light"] {
  --bn-water: #9FD4E0; --bn-pipe: #4C6570; --bn-node: #B5670F;
  --bn-grade: #6A4FA3; --bn-flow: #1C6B7B; --bn-ink: #16404C;
  --bn-wall: #4C6570; --bn-bad: #B33F39;
}

/* ---- Pestañas ----------------------------------------------------------- */
.bn-tabs {
  display: flex; gap: 0.15rem; margin: 0 0 1rem;
  border-bottom: 1px solid var(--line); overflow-x: auto; scrollbar-width: none;
}
.bn-tabs::-webkit-scrollbar { display: none; }
.bn-tabs button {
  font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.04em;
  color: var(--text-faint); background: transparent;
  border: 0; border-bottom: 2px solid transparent;
  padding: 0.45rem 0.6rem; margin-bottom: -1px; cursor: pointer; white-space: nowrap;
}
.bn-tabs button:hover { color: var(--text); }
.bn-tabs button[aria-selected="true"] { color: var(--accent); border-bottom-color: var(--accent); }
.bn-tabs button:focus-visible { outline: 2px solid var(--accent); outline-offset: -2px; }
.bn-tabs .n { opacity: 0.6; margin-left: 0.3rem; font-variant-numeric: tabular-nums; }

/* ---- Escenarios --------------------------------------------------------- */
.preset-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 0.35rem; }
.preset-list button {
  width: 100%; text-align: left; cursor: pointer;
  font-family: var(--font-body); font-size: 0.84rem; color: var(--text-dim);
  background: var(--bg-elev); border: 1px solid var(--line);
  border-radius: var(--radius-sm); padding: 0.45rem 0.65rem;
}
.preset-list button:hover { color: var(--text); border-color: var(--accent); }
.preset-list button.is-on { color: var(--accent); border-color: var(--accent); background: var(--sea-fill); }
.preset-list .p-sub { display: block; font-size: 0.72rem; color: var(--text-faint); margin-top: 0.12rem; }
.preset-list button.is-on .p-sub { color: var(--text-dim); }

/* ---- Fichas plegables --------------------------------------------------- */
.bn-stack { display: grid; gap: 0.35rem; }
.bn-item {
  border: 1px solid var(--line); border-radius: var(--radius-sm);
  background: var(--bg-elev); overflow: hidden;
}
.bn-item.is-open { border-color: var(--accent); }
.bn-head { display: flex; align-items: stretch; }
.bn-sum {
  flex: 1; min-width: 0; display: flex; align-items: center; gap: 0.45rem;
  padding: 0.45rem 0.2rem 0.45rem 0.5rem;
  background: transparent; border: 0; cursor: pointer; text-align: left;
  font-family: var(--font-mono); font-size: 0.73rem; color: var(--text);
}
.bn-sum:hover { background: var(--sea-fill); }
.bn-sum:focus-visible { outline: 2px solid var(--accent); outline-offset: -2px; }
.bn-chev { flex: none; width: 0.6rem; color: var(--text-faint); transition: transform 0.15s; }
.bn-item.is-open .bn-chev { transform: rotate(90deg); }
.bn-sum .badge { flex: none; font-weight: 500; }
.bn-sum .desc { flex: 1; min-width: 0; color: var(--text-dim); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.bn-sum .val { flex: none; color: var(--accent); font-variant-numeric: tabular-nums; }
.bn-acts { display: flex; align-items: center; gap: 0.15rem; padding: 0 0.4rem 0 0.15rem; }
.bn-mini {
  font-family: var(--font-mono); font-size: 0.72rem; line-height: 1;
  color: var(--text-faint); background: transparent;
  border: 1px solid var(--line); border-radius: 4px;
  padding: 0.18rem 0.34rem; cursor: pointer;
}
.bn-mini:hover:not(:disabled) { color: var(--accent); border-color: var(--accent); }
.bn-mini:disabled { opacity: 0.32; cursor: default; }
.bn-open { padding: 0.15rem 0.6rem 0.65rem; }

.bn-grid { display: grid; gap: 0.45rem 0.6rem; grid-template-columns: 1fr 1fr; }
.bn-grid .wide { grid-column: 1 / -1; }
.bn-field { display: grid; gap: 0.18rem; }
.bn-field > label { font-family: var(--font-mono); font-size: 0.66rem; color: var(--text-faint); }
.bn-field input[type="number"], .bn-field select {
  width: 100%; font-family: var(--font-mono); font-size: 0.78rem;
  color: var(--text); background: var(--bg); border: 1px solid var(--line);
  border-radius: 4px; padding: 0.3rem 0.4rem;
}
.bn-field select { font-family: var(--font-body); font-size: 0.8rem; cursor: pointer; }
.bn-field .rng { display: flex; align-items: center; gap: 0.5rem; }
.bn-field .rng input[type="range"] { flex: 1; accent-color: var(--accent); height: 1.1rem; cursor: pointer; }
.bn-field .rng .v {
  font-family: var(--font-mono); font-size: 0.72rem; color: var(--accent);
  font-variant-numeric: tabular-nums; min-width: 4.2rem; text-align: right;
}
.bn-note { font-family: var(--font-mono); font-size: 0.68rem; color: var(--text-faint); margin: 0.5rem 0 0; }

.bn-addrow { display: flex; gap: 0.4rem; margin-top: 0.55rem; }
.bn-add {
  flex: 1; cursor: pointer;
  font-family: var(--font-mono); font-size: 0.72rem; color: var(--text-dim);
  background: transparent; border: 1px dashed var(--line);
  border-radius: var(--radius-sm); padding: 0.45rem;
}
.bn-add:hover:not(:disabled) { color: var(--accent); border-color: var(--accent); }
.bn-add:disabled { opacity: 0.35; cursor: default; }

/* ---- Fichas de accesorios dentro de una tubería -------------------------- */
.bn-fits { display: grid; gap: 0.3rem; margin-top: 0.4rem; }
.bn-fit {
  display: flex; align-items: center; gap: 0.4rem;
  font-family: var(--font-mono); font-size: 0.7rem; color: var(--text-dim);
  border: 1px solid var(--line-soft); border-radius: 4px; padding: 0.3rem 0.4rem;
}
.bn-fit .nm { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.bn-fit .kk { color: var(--accent); font-variant-numeric: tabular-nums; }
.bn-fit input[type="number"] { width: 3rem; font-family: var(--font-mono); font-size: 0.7rem;
  color: var(--text); background: var(--bg); border: 1px solid var(--line); border-radius: 4px; padding: 0.15rem 0.25rem; }
.bn-fit input[type="range"] { width: 4.5rem; accent-color: var(--accent); }

/* ---- Botonera y esquema -------------------------------------------------- */
.bn-actions { display: flex; align-items: center; gap: 0.6rem; margin: 0 0 0.7rem; flex-wrap: wrap; }
.bn-connect {
  font-family: var(--font-mono); font-size: 0.76rem;
  color: var(--text-dim); background: var(--bg-elev);
  border: 1px solid var(--line); border-radius: var(--radius-sm);
  padding: 0.45rem 0.9rem; cursor: pointer;
}
.bn-connect:hover { color: var(--text); border-color: var(--accent); }
.bn-connect.is-on { color: var(--on-accent); background: var(--accent); border-color: var(--accent); }
.bn-hint { font-family: var(--font-mono); font-size: 0.7rem; color: var(--text-faint); }

/* Halo alrededor de todo el texto del esquema: así una etiqueta sigue
   leyéndose aunque caiga sobre una tubería o sobre el marco. */
.bn-svg text { paint-order: stroke; stroke: var(--bg); stroke-width: 3px; stroke-linejoin: round; }
.bn-svg { width: 100%; height: auto; display: block; max-height: 62vh; touch-action: none; }
.bn-svg .drag { cursor: grab; }
.bn-svg .drag:active { cursor: grabbing; }
.bn-viewbar {
  display: flex; align-items: center; justify-content: center; gap: 0.4rem;
  margin: 0.5rem 0 0; flex-wrap: wrap;
  font-family: var(--font-mono); font-size: 0.7rem; color: var(--text-faint);
}
.bn-viewbar .w { color: var(--accent); font-variant-numeric: tabular-nums; min-width: 4rem; text-align: center; }
.bn-viewbar .lab { letter-spacing: 0.04em; }

.fig-caption {
  font-family: var(--font-mono); font-size: 0.68rem; color: var(--text-faint);
  text-align: center; margin: 0.5rem 0 0;
}
.bn-warn {
  margin-top: 0.8rem; padding: 0.5rem 0.7rem;
  border: 1px solid var(--surge); border-left-width: 3px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  background: var(--bg-elev); font-size: 0.8rem; color: var(--text-dim);
}
.bn-warn[hidden] { display: none; }

/* ---- Regla comparativa de longitudes ------------------------------------ */
.bn-len-title {
  font-family: var(--font-mono); font-size: 0.66rem; letter-spacing: 0.09em;
  text-transform: uppercase; color: var(--text-faint); margin: 1.1rem 0 0.45rem;
}
.bn-len {
  display: grid; grid-template-columns: 3.4rem 1fr 4rem;
  align-items: center; gap: 0.5rem; margin-bottom: 0.28rem;
  font-family: var(--font-mono); font-size: 0.72rem;
}
.bn-len .nm { color: var(--text-dim); }
.bn-len .track {
  height: 0.62rem; background: var(--bg-elev);
  border: 1px solid var(--line); border-radius: 3px; overflow: hidden;
}
.bn-len .fill { display: block; height: 100%; background: var(--bn-water); }
.bn-len .va { color: var(--accent); text-align: right; font-variant-numeric: tabular-nums; }

/* ---- Tabla de resultados ------------------------------------------------- */
.bn-tablewrap { margin-top: 1.2rem; overflow-x: auto; }
.bn-table {
  width: 100%; border-collapse: collapse;
  font-family: var(--font-mono); font-size: 0.74rem;
  font-variant-numeric: tabular-nums;
}
.bn-table caption {
  text-align: left; font-size: 0.66rem; letter-spacing: 0.09em;
  text-transform: uppercase; color: var(--text-faint); padding: 0.6rem 0 0.35rem;
}
.bn-table th, .bn-table td { padding: 0.32rem 0.5rem; text-align: right; white-space: nowrap; }
.bn-table th { color: var(--text-faint); font-weight: 500; border-bottom: 1px solid var(--line); }
.bn-table td { color: var(--text); border-bottom: 1px solid var(--line-soft); }
.bn-table th:first-child, .bn-table td:first-child { text-align: left; color: var(--text-dim); }
.bn-table td.hi { color: var(--accent); }
.bn-table tr.is-lam td { color: var(--surge); }
.bn-table tr.is-cav td { color: var(--bn-bad); }
.bn-table td.bad { color: var(--bn-bad); font-weight: 600; }

/* ---- Diagrama de Moody -------------------------------------------------- */
.bn-moody { margin-top: 2.4rem; }
.bn-moody > h3 {
  font-family: var(--font-mono); font-size: 0.68rem; letter-spacing: 0.09em;
  text-transform: uppercase; color: var(--text-faint); margin: 0 0 0.5rem; font-weight: 500;
}
.bn-moody svg { width: 100%; height: auto; display: block; margin-top: 1rem; max-width: 46rem; }
.bn-moody svg text { paint-order: stroke; stroke: var(--bg); stroke-width: 2.5px; stroke-linejoin: round; }

/* ---- §3 ------------------------------------------------------------------ */
.eq-list { display: grid; gap: 0.9rem; margin-top: 1.4rem; }
.eq-item {
  border: 1px solid var(--line); border-left: 3px solid var(--accent);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  background: var(--bg-elev); padding: 0.75rem 1rem; overflow-x: auto;
}
.eq-item h3 {
  font-family: var(--font-mono); font-size: 0.68rem; letter-spacing: 0.09em;
  text-transform: uppercase; color: var(--text-faint); margin: 0 0 0.5rem; font-weight: 500;
}
.eq-item .eq-body { color: var(--text-dim); font-size: 0.92rem; }
.eq-item .eq-body p { margin: 0 0 0.45rem; }
.eq-item .eq-body p:last-child { margin-bottom: 0; }