/* ==========================================================================
   Circuitos con AO — estilos
   ========================================================================== */

:root {
  --bg: #eef1f6;
  --surface: #ffffff;
  --surface-2: #f5f7fa;
  --fg: #1b2330;
  --muted: #5b6678;
  --line: #d9dfe8;
  --accent: #0e7c86;
  --accent-soft: #d8eef0;
  --ok: #15803d;
  --ok-soft: #dcfce7;
  --bad: #dc2626;
  --bad-soft: #fee2e2;
  --warn: #b45309;
  --warn-soft: #fef3c7;
  --board: #f8fafc;
  --board-grid: #e3e8ef;
  --board-dot: #c5cdd9;
  --ink: #273142;
  --fixed: #e8edf4;
  --sel: #0e7c86;
  --sig-1: #64748b;
  --sig-2: #c2410c;
  --sig-obj: #16a34a;
  --sig-real: #2563eb;
  --probe-1: #9333ea;
  --probe-2: #db2777;
  --probe-3: #0891b2;
  --v-neg: #2563eb;
  --v-pos: #dc2626;
  --v-zero: #8a94a6;
  --shadow: 0 1px 2px rgba(20, 30, 50, .06), 0 6px 20px rgba(20, 30, 50, .07);
  --font: "Segoe UI", "Inter", system-ui, -apple-system, "Helvetica Neue", Arial, sans-serif;
  --math: "Cambria Math", "Cambria", "STIX Two Math", "Latin Modern Math", "Times New Roman", serif;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0b0f15; --surface: #141b25; --surface-2: #1a2330; --fg: #e6ebf2; --muted: #97a3b6;
    --line: #2a3545; --accent: #36b8c2; --accent-soft: #15383d; --ok: #4ade80; --ok-soft: #12321f;
    --bad: #f87171; --bad-soft: #3a1717; --warn: #fbbf24; --warn-soft: #3a2a0a;
    --board: #101722; --board-grid: #1c2533; --board-dot: #2c3848; --ink: #cfd8e3; --fixed: #1b2533;
    --sel: #36b8c2; --sig-1: #94a3b8; --sig-2: #fb923c; --sig-obj: #4ade80; --sig-real: #60a5fa;
    --probe-1: #c084fc; --probe-2: #f472b6; --probe-3: #22d3ee;
    --v-neg: #60a5fa; --v-pos: #f87171; --v-zero: #6b7688;
    --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 6px 20px rgba(0, 0, 0, .35);
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #0b0f15; --surface: #141b25; --surface-2: #1a2330; --fg: #e6ebf2; --muted: #97a3b6;
  --line: #2a3545; --accent: #36b8c2; --accent-soft: #15383d; --ok: #4ade80; --ok-soft: #12321f;
  --bad: #f87171; --bad-soft: #3a1717; --warn: #fbbf24; --warn-soft: #3a2a0a;
  --board: #101722; --board-grid: #1c2533; --board-dot: #2c3848; --ink: #cfd8e3; --fixed: #1b2533;
  --sel: #36b8c2; --sig-1: #94a3b8; --sig-2: #fb923c; --sig-obj: #4ade80; --sig-real: #60a5fa;
  --probe-1: #c084fc; --probe-2: #f472b6; --probe-3: #22d3ee;
  --v-neg: #60a5fa; --v-pos: #f87171; --v-zero: #6b7688;
  --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 6px 20px rgba(0, 0, 0, .35);
  color-scheme: dark;
}

* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; }
body {
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font);
  font-size: 14px;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}
button { font-family: inherit; font-size: inherit; color: inherit; }
kbd {
  font-family: var(--font); font-size: 12px; padding: 1px 6px; border-radius: 4px;
  border: 1px solid var(--line); border-bottom-width: 2px; background: var(--surface-2);
}

/* ---------- Barra superior ---------- */
.barra {
  display: flex; align-items: center; gap: 16px;
  padding: 8px 14px;
  background: var(--surface);
  border-bottom: 1px solid var(--line);
  flex: 0 0 auto;
}
.marca { display: flex; align-items: center; gap: 10px; min-width: 0; }
.marca svg { width: 30px; height: 30px; color: var(--accent); flex: 0 0 auto; }
.marca-tit { font-weight: 700; font-size: 16px; white-space: nowrap; }
.marca-sub { font-size: 11.5px; color: var(--muted); white-space: nowrap; }
.nivel-actual { display: flex; align-items: center; gap: 4px; margin: 0 auto; min-width: 0; }
.nivel-nombre {
  display: flex; align-items: center; gap: 10px;
  border: 1px solid var(--line); background: var(--surface-2);
  border-radius: 999px; padding: 5px 14px 5px 5px; cursor: pointer; min-width: 0;
}
.nivel-nombre:hover { border-color: var(--accent); }
.nivel-nombre .num {
  background: var(--accent); color: #fff; border-radius: 999px;
  min-width: 26px; height: 26px; display: grid; place-items: center; font-weight: 700; font-size: 13px; padding: 0 6px;
}
.nivel-nombre .tit { font-weight: 600; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.estrellas { color: #f59e0b; letter-spacing: 1px; white-space: nowrap; }
.estrellas .off { color: var(--line); }
.acciones { display: flex; gap: 6px; flex-wrap: wrap; justify-content: flex-end; }

.btn {
  border: 1px solid var(--line); background: var(--surface); border-radius: 8px;
  padding: 6px 11px; cursor: pointer; line-height: 1.2; white-space: nowrap;
}
.btn:hover { border-color: var(--accent); color: var(--accent); }
.btn:disabled { opacity: .45; cursor: default; color: inherit; border-color: var(--line); }
.btn.ghost { border-color: transparent; background: transparent; font-size: 20px; padding: 2px 10px; }
.btn.primario { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn.primario:hover { filter: brightness(1.08); color: #fff; }
.btn.activo { background: var(--accent-soft); border-color: var(--accent); color: var(--accent); }
.btn.icono { width: 34px; padding: 6px 0; text-align: center; }

/* Botón Solución bloqueado: se va llenando con lo que coloca o quita el alumno */
@property --avance { syntax: '<percentage>'; inherits: false; initial-value: 0%; }
.btn.bloqueado {
  background: linear-gradient(90deg, var(--accent-soft) var(--avance), var(--surface) var(--avance));
  color: var(--muted); border-style: dashed; cursor: help;
  transition: --avance .4s ease-out;
}
.btn.desbloqueado { animation: desbloqueo .8s ease-out 2; }
@keyframes desbloqueo {
  from { box-shadow: 0 0 0 0 var(--accent); }
  to { box-shadow: 0 0 0 9px transparent; }
}

/* ---------- Distribución ---------- */
.juego {
  flex: 1 1 auto;
  display: grid;
  grid-template-columns: 178px minmax(0, 1fr) 380px;
  gap: 12px;
  padding: 12px;
  min-height: 0;
}

/* ---------- Paleta ---------- */
.paleta {
  background: var(--surface); border: 1px solid var(--line); border-radius: 12px;
  padding: 10px; overflow-y: auto; box-shadow: var(--shadow);
}
.grupo-tit { font-size: 11px; text-transform: uppercase; letter-spacing: .08em; color: var(--muted); margin: 4px 2px 6px; font-weight: 600; }
.herramientas, .piezas { display: grid; grid-template-columns: 1fr 1fr; gap: 6px; margin-bottom: 12px; }
.item {
  border: 1px solid var(--line); background: var(--surface-2); border-radius: 9px;
  padding: 6px 4px 5px; cursor: pointer; display: flex; flex-direction: column; align-items: center; gap: 2px;
  position: relative;
}
.item:hover { border-color: var(--accent); }
.item.activo { border-color: var(--accent); background: var(--accent-soft); box-shadow: inset 0 0 0 1px var(--accent); }
.item svg { width: 40px; height: 40px; }
.item .lbl { font-size: 11px; text-align: center; line-height: 1.15; color: var(--fg); }
.item .tecla { position: absolute; top: 3px; right: 5px; font-size: 9.5px; color: var(--muted); }
.item.ancho { grid-column: span 2; flex-direction: row; justify-content: flex-start; gap: 8px; padding: 6px 8px; }

.propiedades {
  border-top: 1px solid var(--line); padding-top: 10px; margin-top: 4px;
}
.propiedades h4 { margin: 0 0 6px; font-size: 13px; }
.propiedades .fila { display: flex; gap: 6px; align-items: center; margin-bottom: 8px; }
.propiedades input[type=text] {
  width: 100%; padding: 6px 8px; border-radius: 7px; border: 1px solid var(--line);
  background: var(--surface-2); color: var(--fg); font-size: 15px; font-family: var(--math);
}
.propiedades input.mal { border-color: var(--bad); background: var(--bad-soft); }
.propiedades .nota { font-size: 11.5px; color: var(--muted); margin: 0 0 8px; }
.propiedades .botones { display: flex; gap: 6px; flex-wrap: wrap; }
.propiedades .pasos { display: flex; align-items: center; gap: 4px; margin-bottom: 6px; font-size: 11.5px; color: var(--muted); }
.propiedades .pasos span:not(:first-child) { margin-left: 8px; }
.propiedades .pasos .btn { padding: 2px 9px; font-size: 14px; }
.norm-ok { color: var(--ok); font-weight: 600; }
.norm-no { color: var(--warn); font-weight: 600; }
.propiedades .botones .btn { padding: 5px 8px; font-size: 12.5px; }

/* ---------- Centro ---------- */
.centro { display: flex; flex-direction: column; gap: 10px; min-width: 0; min-height: 0; }
.objetivo {
  display: flex; align-items: center; gap: 16px;
  background: var(--surface); border: 1px solid var(--line); border-radius: 12px;
  padding: 10px 16px; box-shadow: var(--shadow);
}
.obj-izq { flex: 1; min-width: 0; }
.kicker { font-size: 12.5px; letter-spacing: .02em; color: var(--accent); font-weight: 700; }
.formula { font-family: var(--math); font-size: 26px; margin-top: 2px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.formula .etq { font-family: var(--font); font-size: 13px; color: var(--muted); margin-right: 8px; vertical-align: middle; }
.medidor { width: 150px; text-align: right; flex: 0 0 auto; }
.medidor-num { font-size: 30px; font-weight: 700; font-variant-numeric: tabular-nums; line-height: 1; }
.medidor-num small { font-size: 15px; font-weight: 600; margin-left: 2px; color: var(--muted); }
.medidor-lbl { font-size: 11px; color: var(--muted); text-transform: uppercase; letter-spacing: .06em; }
.medidor-barra { position: relative; height: 6px; background: var(--surface-2); border: 1px solid var(--line); border-radius: 99px; margin-top: 5px; overflow: hidden; }
.medidor-barra .umbral { position: absolute; top: 0; bottom: 0; width: 2px; background: var(--fg); opacity: .55; }
.medidor-barra div { height: 100%; width: 0; background: var(--warn); transition: width .25s, background .25s; }
.medidor.ganado .medidor-num { color: var(--ok); }
.medidor.ganado .medidor-barra div { background: var(--ok); }

.tablero-wrap {
  flex: 1 1 auto; min-height: 0;
  background: var(--surface); border: 1px solid var(--line); border-radius: 12px;
  box-shadow: var(--shadow);
  display: grid; place-items: center; padding: 8px; overflow: hidden;
}
#tablero { width: 100%; height: 100%; display: block; user-select: none; touch-action: none; }
.estado {
  font-size: 12.5px; color: var(--muted); padding: 0 4px;
  height: 20px; line-height: 20px; flex: 0 0 auto;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.estado b { color: var(--fg); }
.estado sup, .estado sub { line-height: 0; }
.estado kbd { line-height: 1; padding-top: 0; padding-bottom: 0; }

/* ---------- Tablero SVG ---------- */
.fondo { fill: var(--board); }
.rejilla { stroke: var(--board-grid); stroke-width: 1; }
.punto { fill: var(--board-dot); }
.pz { fill: none; stroke: var(--ink); stroke-width: 3; stroke-linecap: round; stroke-linejoin: round; }
.pz-fino { fill: none; stroke: var(--ink); stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.pz-relleno { fill: var(--surface); stroke: var(--ink); stroke-width: 2.5; stroke-linejoin: round; }
.pz-nudo { fill: var(--ink); }
.pz-txt { fill: var(--fg); font-family: var(--math); font-size: 13px; text-anchor: middle; dominant-baseline: middle; pointer-events: none; }
.pz-txt.peq { font-family: var(--font); font-size: 10.5px; fill: var(--muted); }
.pz-txt.val { font-family: var(--font); font-size: 11px; font-weight: 600; }
.pz-txt.signo { font-family: var(--font); font-size: 17px; font-weight: 700; }
.pz-fija-fondo { fill: var(--fixed); }
.ao-sat .pz-relleno { fill: var(--bad-soft); stroke: var(--bad); }
.sat-txt { fill: var(--bad); font-family: var(--font); font-size: 11px; font-weight: 700; text-anchor: middle; }
.suelto { fill: var(--surface); stroke: var(--bad); stroke-width: 2; }
.seleccion { fill: none; stroke: var(--sel); stroke-width: 2; stroke-dasharray: 5 4; rx: 6; }
.fantasma { opacity: .5; pointer-events: none; }
.fantasma.invalido .pz, .fantasma.invalido .pz-fino, .fantasma.invalido .pz-relleno { stroke: var(--bad); }
.hover-casilla { fill: var(--accent); opacity: .08; pointer-events: none; }
.est-disp {
  font-family: var(--font); font-size: 9.5px; font-weight: 700; text-anchor: end; pointer-events: none;
  paint-order: stroke; stroke: var(--board); stroke-width: 3px; stroke-linejoin: round;
}
.est-on { fill: var(--ok); }
.est-off { fill: var(--muted); }
.est-z { fill: #9333ea; }
.est-act { fill: var(--warn); }
.est-sat { fill: var(--sig-real); }
.est-rupt { fill: var(--bad); }
.luz { pointer-events: none; transition: opacity .08s; }
.luz-led { fill: #ef4444; filter: blur(3px); }
.luz-lampara { fill: #facc15; filter: blur(2px); }
.luz-motor { fill: var(--accent); filter: blur(2px); }
.progreso-pie { margin-top: 20px; padding-top: 14px; border-top: 1px solid var(--line); display: flex; gap: 12px; align-items: center; flex-wrap: wrap; }
.progreso-pie .sub { flex: 1 1 260px; margin: 0; font-size: 13px; }
.progreso-botones { display: flex; gap: 6px; flex-wrap: wrap; }
.btn.peligro:hover { border-color: var(--bad); color: var(--bad); }
.tema-niveles { margin-top: 14px; }
.tema-niveles h3 { margin: 0 0 6px; font-size: 15px; display: flex; align-items: baseline; gap: 8px; }
.tema-num { font-size: 11px; text-transform: uppercase; letter-spacing: .08em; color: var(--accent); font-weight: 700; }
.tema-prog { margin-left: auto; font-size: 12px; color: #d97706; font-weight: 600; }
.tema-niveles .rejilla-niveles { margin-top: 0; }
.mini rect { fill: var(--surface-2); stroke: var(--line); stroke-width: 1.2; }
.mini text { fill: var(--muted); font-family: var(--font); font-size: 13px; font-weight: 600; text-anchor: middle; }
.mini-cero { stroke: var(--line); stroke-width: 1; }
.mini-ent { fill: none; stroke: var(--sig-1); stroke-width: 2; stroke-linejoin: round; }
.mini-obj { fill: none; stroke: var(--sig-obj); stroke-width: 5; stroke-opacity: .45; stroke-linejoin: round; }
.mini-real { fill: none; stroke: var(--sig-real); stroke-width: 2; stroke-linejoin: round; }
.mini-guia { stroke: var(--line); stroke-width: 1.5; stroke-dasharray: 3 3; }
.sonda-marca circle { stroke: var(--surface); stroke-width: 2; }
.sonda-marca text { fill: #fff; font-family: var(--font); font-size: 10px; font-weight: 700; text-anchor: middle; dominant-baseline: central; }

/* ---------- Panel derecho ---------- */
.panel { display: flex; flex-direction: column; gap: 10px; overflow-y: auto; min-height: 0; padding-right: 2px; }
.tarjeta {
  background: var(--surface); border: 1px solid var(--line); border-radius: 12px;
  padding: 10px 12px; box-shadow: var(--shadow);
}
.tarjeta h3 { margin: 0; font-size: 13px; text-transform: uppercase; letter-spacing: .06em; color: var(--muted); }
.enunciado p { margin: 0; line-height: 1.45; }
.pista {
  margin-top: 8px; padding: 8px 10px; border-radius: 8px; background: var(--warn-soft);
  border-left: 3px solid var(--warn); line-height: 1.45; font-size: 13px;
}
.graf-cab { display: flex; align-items: baseline; justify-content: space-between; gap: 8px; margin-bottom: 4px; flex-wrap: wrap; }
.leyenda { display: flex; gap: 10px; flex-wrap: wrap; font-size: 12px; font-variant-numeric: tabular-nums; }
.leyenda span { display: inline-flex; align-items: center; gap: 4px; white-space: nowrap; }
.leyenda i { width: 14px; height: 3px; border-radius: 2px; display: inline-block; }
.leyenda i.disc { height: 0; border-top: 3px dashed; background: none !important; }
.leyenda .quitar { cursor: pointer; color: var(--muted); border: 0; background: none; padding: 0 2px; }
canvas { width: 100%; display: block; }
.senales { font-size: 12px; color: var(--muted); margin-top: 4px; line-height: 1.5; }
.senales b { color: var(--fg); font-weight: 600; }
.tiempo { display: flex; align-items: center; gap: 8px; margin-top: 6px; }
.tiempo input[type=range] { flex: 1; accent-color: var(--accent); }
.t-lbl { font-size: 12px; font-variant-numeric: tabular-nums; width: 74px; text-align: right; color: var(--muted); }
.check { display: flex; align-items: center; gap: 6px; font-size: 12.5px; color: var(--muted); margin-top: 6px; cursor: pointer; }

.avisos { list-style: none; margin: 6px 0 0; padding: 0; display: flex; flex-direction: column; gap: 5px; }
.avisos li { padding: 6px 9px; border-radius: 7px; font-size: 12.5px; line-height: 1.35; border-left: 3px solid; }
.avisos li.ok { background: var(--ok-soft); border-color: var(--ok); }
.avisos li.aviso { background: var(--warn-soft); border-color: var(--warn); }
.avisos li.error { background: var(--bad-soft); border-color: var(--bad); }
.avisos li.info { background: var(--surface-2); border-color: var(--line); color: var(--muted); }

/* Nivel libre */
.libre { margin-top: 10px; display: flex; flex-direction: column; gap: 8px; }
.libre .fila { display: grid; grid-template-columns: 26px 1fr 54px 54px 54px; gap: 4px; align-items: center; font-size: 12px; }
.libre .cab { color: var(--muted); font-size: 11px; }
.libre select, .libre input {
  width: 100%; padding: 4px 5px; border-radius: 6px; border: 1px solid var(--line);
  background: var(--surface-2); color: var(--fg); font-size: 12.5px; min-width: 0;
}
.libre .expr { display: flex; gap: 6px; align-items: center; }
.libre .expr span { white-space: nowrap; }
.libre .expr input { font-family: var(--math); font-size: 15px; }
.libre .err { color: var(--bad); font-size: 12px; }

/* ---------- Modales ---------- */
.modal {
  position: fixed; inset: 0; background: rgba(10, 15, 25, .45); display: grid; place-items: center; z-index: 50;
  padding: 16px;
}
.modal[hidden] { display: none; }
.modal-caja {
  background: var(--surface); border-radius: 14px; box-shadow: 0 20px 60px rgba(0, 0, 0, .35);
  padding: 22px 26px; width: min(720px, 100%); max-height: calc(100vh - 32px); overflow-y: auto; position: relative;
  line-height: 1.5;
}
.modal-caja.ancha { width: min(980px, 100%); }
.modal-caja.estrecha { width: min(440px, 100%); }
.modal-caja h2 { margin: 0 0 8px; }
.modal-caja h4 { margin: 14px 0 4px; }
.modal-caja ul { margin: 4px 0; padding-left: 18px; }
.modal-caja li { margin: 3px 0; }
.modal-caja .sub { color: var(--muted); margin-top: 0; }
.cerrar { position: absolute; top: 10px; right: 12px; border: 0; background: none; font-size: 24px; cursor: pointer; color: var(--muted); }
.modal-pie { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: 8px; margin-top: 16px; }
.modal-pie .creditos { flex: 1 1 auto; align-self: center; margin: 0; font-size: 13px; color: var(--muted); }
.creditos a { color: var(--accent); }
.ayuda-cols { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.sw { display: inline-block; width: 18px; height: 0; vertical-align: middle; border-top: 3px solid; }
.sw-real { border-color: var(--sig-real); }
.sw-obj { border-color: var(--sig-obj); border-top-style: dashed; }

.rejilla-niveles { display: grid; grid-template-columns: repeat(auto-fill, minmax(210px, 1fr)); gap: 10px; margin-top: 12px; }
.carta {
  text-align: left; border: 1px solid var(--line); background: var(--surface-2); border-radius: 11px; padding: 12px;
  cursor: pointer; display: flex; flex-direction: column; gap: 4px;
}
.carta:hover { border-color: var(--accent); }
.carta.actual { box-shadow: inset 0 0 0 2px var(--accent); }
.carta .n { font-size: 11px; color: var(--accent); font-weight: 700; text-transform: uppercase; letter-spacing: .06em; }
.carta .t { font-weight: 700; font-size: 15px; }
.carta .c { color: var(--muted); font-size: 12.5px; flex: 1; }
.carta .f { font-family: var(--math); font-size: 15px; }
.victoria { text-align: center; }
.victoria .modal-pie { justify-content: center; }
.vic-estrellas { font-size: 44px; color: #f59e0b; letter-spacing: 6px; }
.vic-estrellas .off { color: var(--line); }

/* ---------- Pantallas estrechas ---------- */
@media (max-width: 1180px) {
  .juego { grid-template-columns: 150px minmax(0, 1fr) 320px; }
  .marca-sub { display: none; }
}
@media (max-width: 900px) {
  body { overflow: auto; height: auto; }
  .barra { flex-wrap: wrap; padding: 8px 16px; }
  .nivel-actual { order: 3; width: 100%; justify-content: center; }
  .juego { grid-template-columns: minmax(0, 1fr); padding: 12px 16px; }
  .paleta, .centro, .panel { min-width: 0; }
  .acciones { width: 100%; justify-content: flex-start; }
  .medidor { width: 110px; }
  .medidor-num { font-size: 24px; }
  .paleta { order: 2; }
  .paleta .herramientas, .paleta .piezas { grid-template-columns: repeat(auto-fill, minmax(70px, 1fr)); }
  .centro { order: 1; }
  .tablero-wrap { height: 62vw; }
  .panel { order: 3; overflow: visible; }
  .ayuda-cols { grid-template-columns: 1fr; }
  .formula { font-size: 20px; }
}