:root {
  --papel: #f8f6f1; --papel-suave: #f1eee7; --panel: #ffffff;
  --tinta: #1f2328; --tinta-suave: #656b74; --linea: #e3dfd6; --linea-fuerte: #cfcabf;
  --acento: #1f6f5c; --acento-suave: #e3efea; --rojo: #b2502a;
  --sans: "Segoe UI", system-ui, -apple-system, sans-serif;
  --serif: "Fraunces", Georgia, serif;
  --mono: ui-monospace, Consolas, "Cascadia Mono", monospace;
  --vineta: radial-gradient(70% 70% at 50% 45%, #ffffff 0%, #f1f3f6 55%, #e4e8ee 100%);
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-tema="claro"]) {
    --papel: #16181c; --papel-suave: #1c1f24; --panel: #1f2227;
    --tinta: #ebe8e1; --tinta-suave: #a2a7ae; --linea: #2d3138; --linea-fuerte: #3b4048;
    --acento: #6cc3a6; --acento-suave: #1e3a31; --rojo: #e3936b;
    --vineta: radial-gradient(70% 70% at 50% 45%, #2a2e35 0%, #1f2227 55%, #17191d 100%);
    color-scheme: dark;
  }
}
:root[data-tema="oscuro"] {
    --papel: #16181c; --papel-suave: #1c1f24; --panel: #1f2227;
    --tinta: #ebe8e1; --tinta-suave: #a2a7ae; --linea: #2d3138; --linea-fuerte: #3b4048;
    --acento: #6cc3a6; --acento-suave: #1e3a31; --rojo: #e3936b;
    --vineta: radial-gradient(70% 70% at 50% 45%, #2a2e35 0%, #1f2227 55%, #17191d 100%);
    color-scheme: dark;
  }
}
* { box-sizing: border-box; }
html { background: var(--papel); height: 100%; }
body { margin: 0; height: 100%; overflow: auto; font-family: var(--sans); color: var(--tinta); font-size: 16px; line-height: 1.5;
  padding-left: max(20px, env(safe-area-inset-left)); padding-right: max(20px, env(safe-area-inset-right)); }
/* La pagina llena la altura del marco que la incrusta: el escenario toma lo que sobra. */
.pagina { max-width: 1120px; margin: 0 auto; padding-block: .5rem .6rem; height: 100%; display: flex; flex-direction: column; min-height: 0; box-sizing: border-box; }
a { color: var(--acento); }

/* ---------- el panel ---------- */
.panel { margin: 0; flex: 1 1 auto; min-height: 280px; display: flex; flex-direction: column; background: var(--panel); border: 1px solid var(--linea); border-radius: 14px; overflow: hidden; box-shadow: 0 1px 2px rgba(0,0,0,.04), 0 12px 32px -16px rgba(0,0,0,.18); }
.panel-cabecera { display: flex; justify-content: space-between; align-items: center; padding: .55rem .8rem; border-bottom: 1px solid var(--linea); font-family: var(--mono); font-size: .72rem; letter-spacing: .02em; color: var(--tinta-suave); }
.vivo::before { content: ""; display: inline-block; width: 7px; height: 7px; border-radius: 50%; background: var(--acento); margin-right: .5em; vertical-align: 1px; animation: pulso 1.6s ease-in-out infinite; }
@keyframes pulso { 50% { opacity: .3; } }
.insignia { padding: .15em .6em; border-radius: 999px; border: 1px solid var(--acento); color: var(--acento); text-transform: uppercase; letter-spacing: .08em; font-size: .66rem; }
.insignia.libre { border-color: var(--linea-fuerte); color: var(--tinta-suave); }
.insignia.levantando { border-color: var(--rojo); color: var(--rojo); }
.lienzo-caja { position: relative; flex: 1; min-height: 200px; background: var(--vineta); }
#lienzo { position: absolute; inset: 0; width: 100%; height: 100%; display: block; touch-action: none; cursor: move; }
#lienzo.sobre-pendulo { cursor: grab; }
#lienzo.arrastrando { cursor: grabbing; }
.pista { font-family: var(--mono); font-size: .68rem; color: var(--tinta-suave); }
.tablero { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: .6rem; align-items: center; margin-top: .6rem; flex: none; }
.lecturas { display: grid; grid-template-columns: repeat(4, 1fr); background: var(--panel); border: 1px solid var(--linea); border-radius: 12px; overflow: hidden; font-family: var(--mono); font-size: .78rem; }
.lecturas span { display: flex; align-items: baseline; gap: .4em; padding: .5rem .8rem; border-right: 1px solid var(--linea); }
.lecturas span:last-child { border-right: 0; }
.lecturas i { font-style: italic; font-family: var(--serif); color: var(--tinta-suave); width: 1.1em; }
.lecturas b { font-weight: 500; margin-left: auto; font-variant-numeric: tabular-nums; }
.lecturas u { text-decoration: none; color: var(--tinta-suave); font-size: .68rem; }
.panel-pie { margin: 0; padding: .45rem .8rem; border-top: 1px solid var(--linea); background: var(--papel-suave); text-align: center; }
.mandos { display: flex; gap: .6rem; flex-wrap: wrap; justify-content: flex-end; }
.segmentos { display: flex; gap: 2px; padding: 3px; background: var(--panel); border: 1px solid var(--linea); border-radius: 999px; }
button { font: inherit; font-size: .84rem; color: var(--tinta); background: transparent; border: 0; border-radius: 999px; padding: .32rem .75rem; cursor: pointer; transition: background .15s; }
button:hover { background: var(--acento-suave); }
button.modo.activo { background: var(--acento); color: #fff; }

/* ---------- trazas ---------- */
.trazas { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: .6rem; margin-top: .6rem; flex: none; }
.traza { background: var(--panel); border: 1px solid var(--linea); border-radius: 10px; padding: .55rem .7rem .4rem; min-width: 0; }
.traza.salida { border-color: var(--acento); }
.traza header { display: flex; align-items: baseline; gap: .35em; font-size: .78rem; color: var(--tinta-suave); margin-bottom: .2rem; }
.traza header b { margin-left: auto; font-family: var(--mono); font-weight: 500; color: var(--tinta); font-variant-numeric: tabular-nums; }
.traza header u { text-decoration: none; font-size: .68rem; }
.traza canvas { width: 100%; height: 34px; display: block; }
.nota-trazas { font-size: .76rem; color: var(--tinta-suave); margin: .4rem 0 0; max-width: none; flex: none; }


@media (max-width: 600px) {
  .tablero { grid-template-columns: 1fr; } .mandos { justify-content: center; }
  .trazas { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .traza.salida { grid-column: span 2; }
}
@media (max-width: 480px) {
  .lecturas { grid-template-columns: repeat(2, 1fr); } .lecturas span:nth-child(2) { border-right: 0; }
  .lecturas span:nth-child(-n+2) { border-bottom: 1px solid var(--linea); }
}