:root {
    --bg: #eef1f4; --surface: #ffffff; --surface-2: #f5f7f9; --line: #d3dae1; --line-strong: #a9b5c1;
    --ink: #15202b; --ink-2: #3f4d5b; --muted: #5f6e7d;
    --arterial: #b8322a; --ventricular: #2b5fa8; --ghost: #a9b5c1;
    --ok: #2e7d4f; --ok-bg: #e4f2ea; --warn: #9a6512; --warn-bg: #fbefd6;
    --focus: #2b5fa8; --thumb: #15202b;
    --f-display: "Newsreader", Georgia, "Times New Roman", serif;
    --f-body: "IBM Plex Sans", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
    --f-mono: "IBM Plex Mono", ui-monospace, Consolas, "Courier New", monospace;
    --radius: 6px;
  }
  /* Tema: data-tema (claro/oscuro) lo fija el selector de la página — "Sistema" resuelve según prefers-color-scheme —
     y manda sobre data-theme (preferencia del visor) y sobre el sistema. Sin JS, valen el sistema y data-theme. */
  @media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]):not([data-tema="claro"]) {
      --bg: #0f1418; --surface: #171e25; --surface-2: #1d262f; --line: #2b3743; --line-strong: #465563;
      --ink: #e6ebf0; --ink-2: #b9c4cf; --muted: #8d9aa7;
      --arterial: #e25d52; --ventricular: #5f93ea; --ghost: #56667a;
      --ok: #5cc48a; --ok-bg: #16311f; --warn: #e0b25a; --warn-bg: #3a2d10;
      --focus: #5f93ea; --thumb: #e6ebf0;
    }
  }
  :root[data-theme="dark"]:not([data-tema="claro"]), :root[data-tema="oscuro"] {
    --bg: #0f1418; --surface: #171e25; --surface-2: #1d262f; --line: #2b3743; --line-strong: #465563;
    --ink: #e6ebf0; --ink-2: #b9c4cf; --muted: #8d9aa7;
    --arterial: #e25d52; --ventricular: #5f93ea; --ghost: #56667a;
    --ok: #5cc48a; --ok-bg: #16311f; --warn: #e0b25a; --warn-bg: #3a2d10;
    --focus: #5f93ea; --thumb: #e6ebf0;
  }
  :root[data-tema="claro"] { color-scheme: light; }
  :root[data-tema="oscuro"] { color-scheme: dark; }

  * { box-sizing: border-box; }
  [hidden] { display: none !important; }
  html, body { height: 100%; }
  body {
    margin: 0; background: var(--bg); color: var(--ink);
    font-family: var(--f-body); font-size: 14px; line-height: 1.45;
    padding-inline: 16px; padding-block: 0 40px;
    -webkit-font-smoothing: antialiased;
  }
  h1, h2, h3 { font-family: var(--f-display); font-weight: 500; margin: 0; text-wrap: balance; }
  h1 { font-size: 26px; line-height: 1.15; }
  h2 { font-size: 18px; line-height: 1.2; }
  h3 { font-size: 15px; }
  p { margin: 0; }
  small { font-size: 12px; }
  .mono { font-family: var(--f-mono); font-variant-numeric: tabular-nums; }
  .label { font-size: 11px; letter-spacing: .06em; text-transform: uppercase; color: var(--muted); font-weight: 500; }
  .label-lc { font-size: 11px; letter-spacing: .02em; color: var(--muted); font-weight: 500; }
  :focus-visible { outline: 2px solid var(--focus); outline-offset: 2px; }
  .sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

  /* ---- cabecera ---- */
  .topbar {
    max-width: 1440px; margin-inline: auto;
    display: flex; flex-wrap: wrap; align-items: flex-end; justify-content: space-between; gap: 12px 24px;
    padding-block: 20px 14px; border-bottom: 1px solid var(--line);
  }
  .topbar .sub { color: var(--muted); margin-top: 4px; max-width: 60ch; }
  .segment { display: inline-flex; border: 1px solid var(--line-strong); border-radius: var(--radius); overflow: hidden; }
  .segment button {
    font: inherit; font-weight: 500; color: var(--ink-2); background: var(--surface);
    border: 0; padding: 8px 16px; cursor: pointer; border-right: 1px solid var(--line-strong);
  }
  .segment button:last-child { border-right: 0; }
  .segment button[aria-pressed="true"] { background: var(--ink); color: var(--surface); }
  .segment button:focus-visible { outline-offset: -3px; }
  .controles-cabecera { display: flex; flex-wrap: wrap; gap: 10px 14px; align-items: center; }
  .segment-sm button { padding: 6px 12px; font-size: 12px; }

  /* ---- lectura interpretativa ---- */
  .lectura { font-family: var(--f-display); font-size: 16px; line-height: 1.4; color: var(--ink); padding: 12px 16px; border-left: 3px solid var(--arterial); background: var(--surface); border-radius: 0 var(--radius) var(--radius) 0; text-wrap: pretty; }
  .lectura b { font-weight: 600; }
  .lectura .mono { font-size: 14px; }

  /* ---- app ---- */
  .app {
    max-width: 1440px; margin-inline: auto;
    display: grid; grid-template-columns: var(--sidebar, 320px) minmax(0, 1fr); gap: 20px; padding-block: 20px;
  }
  .sidebar-wrap { position: sticky; top: 16px; align-self: start; max-height: calc(100vh - 32px); display: flex; min-width: 0; }
  .panel { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 16px; min-width: 0; }
  .panel-head { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; margin-bottom: 12px; }
  .panel-head.sin-margen { margin: 0; }
  .resultados { display: grid; gap: 20px; min-width: 0; align-content: start; }

  /* ---- perillas ---- */
  .perillas { flex: 1; min-width: 0; overflow: auto; display: grid; gap: 18px; align-content: start; }
  .switches { display: grid; gap: 10px; }
  .switch { display: grid; grid-template-columns: 38px 1fr; column-gap: 10px; align-items: start; cursor: pointer; }
  .switch input { appearance: none; margin: 2px 0 0; width: 38px; height: 22px; border-radius: 11px; background: var(--line-strong); position: relative; cursor: pointer; transition: background .15s; }
  .switch input::after { content: ""; position: absolute; top: 3px; left: 3px; width: 16px; height: 16px; border-radius: 50%; background: var(--surface); transition: transform .15s; }
  .switch input:checked { background: var(--ok); }
  .switch input:checked::after { transform: translateX(16px); }
  .switch .txt { display: grid; }
  .switch .txt span { font-weight: 500; }
  .switch .txt small { color: var(--muted); }

  .knob { --k: 1; display: grid; gap: calc(6px * var(--k)); padding-top: 12px; border-top: 1px solid var(--line); }
  .knob-head { display: flex; align-items: baseline; justify-content: space-between; gap: 8px; }
  .knob-head label { font-weight: 500; font-size: calc(14px * var(--k)); }
  .knob-head output { font-family: var(--f-mono); font-variant-numeric: tabular-nums; font-size: calc(15px * var(--k)); }
  .knob-head output .unit { color: var(--muted); font-size: calc(12px * var(--k)); margin-left: 4px; font-family: var(--f-body); }
  .knob input[type="range"] { -webkit-appearance: none; appearance: none; background: transparent; width: 100%; margin: 4px 0; height: calc(24px * var(--k)); cursor: pointer; }
  .knob input[type="range"]::-webkit-slider-runnable-track { height: calc(6px * var(--k)); border-radius: 3px; background: var(--line-strong); }
  .knob input[type="range"]::-webkit-slider-thumb { -webkit-appearance: none; width: calc(18px * var(--k)); height: calc(18px * var(--k)); border-radius: 50%; background: var(--thumb); border: 2px solid var(--surface); box-shadow: 0 0 0 1px var(--line-strong); margin-top: calc(-6px * var(--k)); }
  .knob input[type="range"]::-moz-range-track { height: calc(6px * var(--k)); border-radius: 3px; background: var(--line-strong); }
  .knob input[type="range"]::-moz-range-thumb { width: calc(18px * var(--k)); height: calc(18px * var(--k)); border-radius: 50%; background: var(--thumb); border: 2px solid var(--surface); box-shadow: 0 0 0 1px var(--line-strong); }
  .knob input[type="range"]:disabled { opacity: .45; cursor: default; }
  .knob-scale { display: flex; justify-content: space-between; color: var(--muted); font-size: calc(11px * var(--k)); }
  .knob-note { font-size: 12px; color: var(--muted); }
  .knob-note.on { color: var(--ok); }
  .btn { font: inherit; font-weight: 500; color: var(--ink); background: var(--surface-2); border: 1px solid var(--line-strong); border-radius: var(--radius); padding: 8px 12px; cursor: pointer; }
  .btn:hover { background: var(--line); }

  /* ---- tiles ---- */
  .tiles { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 12px; }
  .tile { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 12px 14px; display: grid; gap: 4px; align-content: start; min-width: 0; }
  .tile .big { font-family: var(--f-mono); font-variant-numeric: tabular-nums; font-size: 28px; line-height: 1.1; letter-spacing: -.01em; }
  .tile .big .u { font-size: 13px; color: var(--muted); margin-left: 4px; letter-spacing: 0; font-family: var(--f-body); }
  .tile .sub { color: var(--ink-2); font-size: 12px; }
  .pill { justify-self: start; display: inline-flex; align-items: center; gap: 4px; font-size: 11px; font-weight: 500; padding: 2px 8px; border-radius: 10px; margin-top: 2px; }
  .pill.ok { color: var(--ok); background: var(--ok-bg); }
  .pill.warn { color: var(--warn); background: var(--warn-bg); }
  .pill, .knob-note, td.d { transition: color .2s, background-color .2s; }

  /* ---- corazón ---- */
  .fila-monitor { display: grid; grid-template-columns: 250px minmax(0, 1fr); gap: 20px; align-items: stretch; }
  .corazon { display: grid; grid-template-rows: auto 1fr auto; align-content: start; }
  .corazon .escena { width: 100%; max-width: 230px; margin-inline: auto; align-self: center; }
  .corazon .escena svg { display: block; width: 100%; height: auto; overflow: visible; transition: opacity .3s; }
  .corazon .credito { font-size: 11px; color: var(--muted); margin-top: 6px; }

  /* ---- redimensionar perillas (alto, como filas) y panel (ancho, como columnas) ---- */
  .knob-resize { height: 10px; margin: 0 -4px -6px; cursor: row-resize; border-radius: 5px; position: relative; touch-action: none; }
  .knob-resize::after { content: ""; position: absolute; left: 50%; top: 4px; width: 32px; height: 2px; margin-left: -16px; border-radius: 1px; background: var(--line-strong); opacity: 0; transition: opacity .15s; }
  .knob:hover .knob-resize::after, .knob-resize:focus-visible::after { opacity: 1; }
  .knob-resize:focus-visible { outline: 2px solid var(--focus); outline-offset: 0; }
  .col-resize { width: 10px; margin-left: 5px; cursor: col-resize; border-radius: 5px; position: relative; flex: none; touch-action: none; }
  .col-resize::after { content: ""; position: absolute; top: 50%; left: 4px; width: 2px; height: 40px; margin-top: -20px; border-radius: 1px; background: var(--line-strong); opacity: .6; }
  .col-resize:hover::after, .col-resize:focus-visible::after { opacity: 1; background: var(--focus); }
  .panel-monitor { display: flex; flex-direction: column; }
  .panel-monitor .monitor-wrap { flex: 1; min-height: 270px; }
  /* fuera del flujo: el tamaño intrínseco del canvas no debe inflar la fila */
  .panel-monitor .monitor { position: absolute; inset: 0; width: 100%; height: 100%; min-height: 0; }

  /* ---- monitor ---- */
  .monitor-wrap { position: relative; }
  .monitor { display: block; width: 100%; height: 260px; border-radius: 4px; touch-action: pan-y; }
  .legend { display: flex; flex-wrap: wrap; gap: 6px 18px; align-items: center; font-size: 12px; color: var(--ink-2); }
  .legend .sw { display: inline-block; width: 18px; height: 0; border-top: 2px solid; vertical-align: middle; margin-right: 6px; }
  .legend .sw.a { border-color: var(--arterial); }
  .legend .sw.v { border-top-width: 2px; border-color: var(--ventricular); }
  .live { margin-left: auto; display: flex; gap: 14px; font-family: var(--f-mono); font-variant-numeric: tabular-nums; }
  .live b { font-weight: 500; color: var(--ink); }
  .tip { position: absolute; pointer-events: none; background: var(--surface); border: 1px solid var(--line-strong); border-radius: 4px; padding: 6px 8px; font-size: 12px; box-shadow: 0 2px 8px rgba(0,0,0,.12); display: grid; gap: 2px; min-width: 150px; z-index: 2; }
  .tip .row { display: flex; justify-content: space-between; gap: 12px; }
  .tip .row .v { font-family: var(--f-mono); font-variant-numeric: tabular-nums; }

  /* ---- fila de diagramas ---- */
  .fila { display: grid; grid-template-columns: 3fr 2fr; gap: 20px; }
  .pv { display: block; width: 100%; height: 280px; }
  .vaso svg { display: block; width: 100%; height: auto; }
  .fig-note { color: var(--muted); font-size: 12px; margin-top: 8px; }

  /* ---- tablas ---- */
  .grupos { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px 28px; }
  table { border-collapse: collapse; width: 100%; font-size: 13px; }
  th, td { text-align: left; padding: 5px 6px; border-bottom: 1px solid var(--line); vertical-align: baseline; }
  th { font-weight: 500; color: var(--muted); font-size: 11px; letter-spacing: .05em; text-transform: uppercase; }
  td.n, th.n { text-align: right; font-family: var(--f-mono); font-variant-numeric: tabular-nums; white-space: nowrap; }
  td.n .u { color: var(--muted); font-family: var(--f-body); font-size: 11px; margin-left: 3px; }
  td.d { color: var(--muted); }
  td.d.up, td.d.down { color: var(--warn); }
  caption { text-align: left; font-family: var(--f-display); font-size: 15px; padding: 0 0 6px; caption-side: top; }

  /* ---- modelo ---- */
  details.panel summary { cursor: pointer; font-family: var(--f-display); font-size: 18px; list-style: none; display: flex; align-items: center; gap: 8px; }
  details.panel summary::-webkit-details-marker { display: none; }
  details.panel summary::before { content: "▸"; font-size: 13px; color: var(--muted); transition: transform .15s; }
  details.panel[open] summary::before { transform: rotate(90deg); }
  .modelo-body { display: grid; gap: 18px; margin-top: 14px; }
  .modelo-body table { font-size: 13px; }
  .modelo-body td:first-child { font-weight: 500; white-space: nowrap; }
  .modelo-body td code { font-family: var(--f-mono); font-size: 12.5px; background: var(--surface-2); padding: 1px 4px; border-radius: 3px; }
  .modelo-body ul { margin: 0; padding-left: 18px; display: grid; gap: 4px; max-width: 80ch; }
  .modelo-body .tabla-wrap { overflow-x: auto; }

  @media (max-width: 1100px) {
    .tiles { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .fila, .fila-monitor { grid-template-columns: 1fr; }
    .corazon .escena { max-width: 240px; }
  }
  @media (max-width: 900px) {
    .app { grid-template-columns: 1fr; }
    .sidebar-wrap { position: static; max-height: none; }
    .col-resize { display: none; }
    .grupos { grid-template-columns: 1fr; }
  }
  @media (max-width: 480px) {
    .tiles { grid-template-columns: 1fr; }
    .tile .big { font-size: 24px; }
    .live { margin-left: 0; }
  }
  @media (prefers-reduced-motion: reduce) {
    .switch input, .switch input::after, details.panel summary::before, .pill, .knob-note, td.d { transition: none; }
    .corazon .escena svg, .knob-resize::after { transition: none; }
  }