/* Volt — estilos propios. Tokens de la familia en casa-estilo.css (--ce-*). */
:root { --wire: #9aa0ab; --cu: #d98a4a; }

html, body { margin: 0; min-height: 100%; }
body { font-size: 15px; }
a { color: inherit; }
[hidden] { display: none !important; }

* { scrollbar-width: thin; scrollbar-color: var(--ce-line) transparent; }
*::-webkit-scrollbar { width: 8px; height: 8px; }
*::-webkit-scrollbar-thumb { background: var(--ce-line); border-radius: 8px; }

/* ---- topbar ---- */
.topbar { display: flex; align-items: center; gap: 18px; padding: 12px 18px; border-bottom: 1px solid var(--ce-line);
  background: var(--ce-panel); position: sticky; top: 0; z-index: 10; flex-wrap: wrap; }
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; }
.logo-mark { border-radius: 8px; display: block; }
.logo { font-weight: 800; font-size: 20px; color: var(--ce-accent); }
.tag { color: var(--ce-muted); font-size: 13px; }
.crumbs { display: flex; gap: 8px; font-size: 13px; color: var(--ce-muted); }
.crumbs a { text-decoration: none; } .crumbs a:hover { color: var(--ce-accent); }

#app { padding-top: 24px; padding-bottom: 60px; }

/* ---- home ---- */
.hero h1 { font-size: clamp(26px, 4vw, 38px); line-height: 1.15; margin: 10px 0 12px; }
.hero h1 em { color: var(--ce-accent); font-style: normal; }
.hero p { color: var(--ce-muted); max-width: 680px; margin: 0 0 26px; }
.levels { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 14px; }
.lv { display: flex; gap: 16px; text-decoration: none; align-items: flex-start; }
.lv.soon { opacity: .55; } .lv.soon:hover { transform: none; border-color: var(--ce-line); }
.lv-num { font-size: 26px; font-weight: 800; color: var(--ce-accent); min-width: 44px; }
.lv-body { display: flex; flex-direction: column; gap: 6px; flex: 1; }
.lv-title { font-weight: 650; font-size: 16px; }
.lv-blurb { color: var(--ce-muted); font-size: 13px; }
.lv .ce-badge { align-self: flex-start; }
.bar { height: 4px; border-radius: 3px; background: var(--ce-input); overflow: hidden; margin-top: 4px; }
.bar i { display: block; height: 100%; background: var(--ce-accent); }

/* ---- nivel ---- */
.steps { display: flex; gap: 6px; flex-wrap: wrap; margin-bottom: 20px; }
.steps a { text-decoration: none; font-size: 13px; color: var(--ce-muted); border: 1px solid var(--ce-line);
  border-radius: 20px; padding: 6px 13px 6px 6px; display: inline-flex; align-items: center; gap: 8px; transition: .16s; }
.steps a b { width: 22px; height: 22px; border-radius: 50%; background: var(--ce-input); display: grid; place-items: center; font-size: 11px; }
.steps a:hover { border-color: var(--ce-accent); color: var(--ce-text); }
.steps a.on { border-color: var(--ce-accent); color: var(--ce-text); background: var(--ce-accent-wash); }
.steps a.done b { background: var(--ce-ok); color: #06140a; }
.steps a.done b::before { content: '✓'; } .steps a.done b { font-size: 0; } .steps a.done b::before { font-size: 12px; }

.step h2 { font-size: 24px; margin: 0 0 8px; }
.lead { color: #cfd0d6; max-width: 760px; }
.step-foot { display: flex; justify-content: space-between; margin-top: 30px; gap: 10px; }
.step-foot .ce-btn { text-decoration: none; }

.small { font-size: 12.5px; } .muted { color: var(--ce-muted); } .warn { color: var(--ce-accent); }

/* ---- simuladores ---- */
.sim { width: 100%; height: auto; display: block; background: var(--ce-bg2); border: 1px solid var(--ce-line);
  border-radius: var(--ce-r-lg); margin: 14px 0; user-select: none; }
.sim .lab { fill: var(--ce-muted); font-size: 14px; font-family: var(--ce-sans); }
.sim .lab.small { font-size: 12px; }
.sim .lab.warn { fill: var(--ce-accent); font-weight: 700; }
.sim .mask { fill: var(--ce-bg2); }
.sim .sym { stroke: var(--ce-text); stroke-linecap: round; }
.sim .sym-fill { fill: var(--ce-text); }
.sim .wireline { fill: none; stroke: var(--cu); stroke-width: 4; stroke-linejoin: round; }
.sim .dot { fill: #ffe38a; }
.sim .drop { fill: #9fd0ff; }

/* agua */
.tank { fill: none; stroke: var(--wire); stroke-width: 3; }
.pipe { fill: #1f5fbf; stroke: var(--wire); stroke-width: 2; transition: y .15s, height .15s; }
.lvl { stroke: var(--ce-accent); stroke-width: 2; }
.wheel { fill: none; stroke: var(--wire); stroke-width: 3; }
.paddle { fill: #6b7280; } .hub { fill: var(--wire); }

/* CC/CA */
.axis { stroke: var(--ce-line); stroke-width: 1.5; }
.wave { stroke: var(--ce-accent); stroke-width: 3; }
.cursor { stroke: var(--ce-muted2); stroke-dasharray: 4 4; }
.curdot { fill: var(--ce-accent); }
.wire { fill: #3a2a1e; stroke: var(--cu); stroke-width: 2; }

/* cables */
.wall { fill: var(--ce-card); }
.cable { cursor: pointer; }
.cable path { fill: none; stroke-width: 16; stroke-linecap: round; transition: stroke-width .15s; }
.cable:hover path, .cable.sel path { stroke-width: 22; }
.cable .lab { font-weight: 700; fill: var(--ce-text); }
.socket { fill: #e8e6df; } .socket-in { fill: #d6d3ca; } .hole { fill: #222; } .clip { fill: #b8bcc4; }

/* circuito */
.switch { cursor: pointer; }
.switch line { transition: all .18s; }
.bulb .glass { stroke: #c9ced6; stroke-width: 1.4; transition: fill .2s; }
.bulb .base { fill: #9aa0ab; }
.bulb .halo { transition: opacity .2s; }
.slot { cursor: pointer; transition: opacity .2s; }
.slot.out .bulb { opacity: .12; }
.meter { fill: var(--ce-card); stroke: var(--ce-line); }
.scale { stroke: var(--ce-muted2); stroke-width: 2; }
.needle { stroke: var(--ce-accent); stroke-width: 2.5; stroke-linecap: round; transition: transform .25s cubic-bezier(.34,1.4,.5,1); }

/* ---- controles y lecturas ---- */
.controls { display: grid; gap: 12px; max-width: 620px; margin: 6px 0 14px; }
.sl { display: grid; gap: 4px; font-size: 13px; color: var(--ce-muted); }
.sl b { color: var(--ce-text); }
.ce-seg { margin-top: 8px; }

.readout { display: grid; gap: 10px; margin: 10px 0 18px; }
.readout.four { grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); }
.readout.three { grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); }
.readout > div { background: var(--ce-card); border: 1px solid var(--ce-line); border-radius: 12px; padding: 10px 14px;
  display: flex; flex-direction: column; gap: 2px; }
.readout small { color: var(--ce-muted); font-size: 12px; }
.readout b { font-size: 14px; }
.readout span { font-size: 22px; font-weight: 700; color: var(--ce-accent); font-variant-numeric: tabular-nums; }

.note { background: var(--ce-panel); border: 1px solid var(--ce-line); border-left: 3px solid var(--ce-info);
  border-radius: var(--ce-r); padding: 12px 16px; margin: 14px 0; font-size: 14px; color: #d4d5da; }
.note ul { margin: 6px 0 0; padding-left: 20px; } .note li { margin: 4px 0; }
.cable-info { border-left-color: var(--ce-accent); min-height: 70px; }
.state { min-height: 26px; display: flex; gap: 10px; align-items: center; flex-wrap: wrap; font-size: 14px; }

.table-wrap { overflow-x: auto; margin: 14px 0; }
table.mag { border-collapse: collapse; width: 100%; font-size: 14px; min-width: 620px; }
.mag th, .mag td { text-align: left; padding: 9px 12px; border-bottom: 1px solid var(--ce-line); }
.mag th { color: var(--ce-muted); font-weight: 600; font-size: 12px; text-transform: uppercase; letter-spacing: .05em; }
.mag td:first-child { font-weight: 650; }

/* Ley de Ohm */
.ohm { display: grid; grid-template-columns: 160px 1fr; gap: 20px; align-items: center; margin: 10px 0; }
.tri { width: 160px; }
.tri-p { fill: none; stroke: var(--ce-muted2); stroke-width: 2; }
.tri text { font: 700 28px var(--ce-sans); fill: var(--ce-muted); cursor: pointer; }
.tri text.on { fill: var(--ce-accent); }
.formula { font-size: 18px; font-variant-numeric: tabular-nums; margin: 0 0 8px; }
.formula.small { font-size: 14px; color: var(--ce-muted); }
@media (max-width: 560px) { .ohm { grid-template-columns: 1fr; } }

/* quiz */
.quiz { background: var(--ce-card); border: 1px solid var(--ce-line); border-radius: 12px; padding: 14px 16px; margin: 18px 0 6px; }
.quiz-q { margin: 0 0 10px; font-weight: 550; }
.quiz-q small { color: var(--ce-muted); font-weight: 400; }
.quiz-opts { display: flex; flex-wrap: wrap; gap: 8px; }
.quiz-opts .ce-chip { font-size: 13.5px; padding: 7px 13px; color: var(--ce-text); }
.ce-chip.ok { border-color: var(--ce-ok); background: rgba(63,185,80,.12); }
.ce-chip.ko { border-color: var(--ce-accent); background: var(--ce-accent-wash); }
.quiz-why { margin: 10px 0 0; font-size: 14px; }
.quiz-why.ok { color: var(--ce-ok); } .quiz-why.ko { color: var(--ce-accent); }

/* ---- N3 · protecciones ---- */
.board { display: grid; grid-template-columns: 120px 1fr 1.4fr; gap: 16px; align-items: center; background: var(--ce-bg2);
  border: 1px solid var(--ce-line); border-radius: var(--ce-r-lg); padding: 16px; margin: 14px 0; }
.rcd-board { grid-template-columns: 130px 1fr; }
.rcd-board .sim { margin: 0; border: 0; }
.dev { display: flex; flex-direction: column; align-items: center; gap: 6px; text-align: center; }
.devbox { cursor: pointer; }
.devbox .din { width: 64px; height: auto; display: block; filter: drop-shadow(0 4px 10px rgba(0,0,0,.5)); }
.rcd-board .devbox .din { width: 110px; }
.devbox .testbtn { cursor: pointer; }
.devbox .testbtn:hover path:first-child { fill: #4a6cf0; }
.devlab { color: var(--ce-muted); font-size: 11.5px; }
.nodev { width: 80px; height: 104px; border: 2px dashed var(--ce-line); border-radius: 8px; display: grid; place-items: center;
  color: var(--ce-muted2); font-size: 12px; }
.line { display: flex; flex-direction: column; gap: 6px; }
.cablebar { height: 14px; border-radius: 7px; background: var(--ce-input); overflow: hidden; border: 1px solid var(--ce-line); }
.cablebar i { display: block; height: 100%; transition: width .3s; }
.cablebar.hot { box-shadow: 0 0 14px rgba(255,90,40,.6); }
.cablelab { color: var(--ce-muted); font-size: 12px; }
.strip { display: flex; flex-direction: column; gap: 8px; }
.chips { display: flex; flex-wrap: wrap; gap: 6px; }
.chips .ce-chip { color: var(--ce-text); } .chips small { color: var(--ce-muted); }
.short { align-self: flex-start; }
.heat { display: flex; align-items: center; gap: 12px; font-size: 13px; color: var(--ce-muted); margin: 6px 0; }
.hbar { flex: 1; max-width: 360px; height: 8px; border-radius: 4px; background: var(--ce-input); overflow: hidden; }
.hbar i { display: block; height: 100%; background: linear-gradient(90deg, var(--ce-warn), var(--ce-accent)); }
.toggles { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 10px; margin: 6px 0 4px; }
.washer { fill: #d9dbe0; stroke: #9aa0ab; stroke-width: 2; } .drum { fill: #9aa0ab; } .drum-in { fill: #3a4150; }
.person { fill: none; stroke: var(--ce-text); stroke-width: 3; }
.person-l { fill: none; stroke: var(--ce-text); stroke-width: 3; stroke-linecap: round; transition: d .2s; }
.sim .leak { fill: var(--ce-accent); }
h3.sub { font-size: 14px; color: var(--ce-muted); text-transform: uppercase; letter-spacing: .06em; margin: 22px 0 8px; }
.bodyscale .track { position: relative; height: 54px; border-radius: 8px; margin-bottom: 6px;
  background: linear-gradient(90deg, #1f3a26 0%, #4a4320 45%, #5a2a22 70%, #7a1f1a 100%); }
.bodyscale .z { position: absolute; top: 6px; transform: translateX(-50%); font-size: 11.5px; text-align: center; line-height: 1.2;
  border-left: 1px solid rgba(255,255,255,.35); padding-left: 4px; white-space: nowrap; }
.bodyscale .z small { color: #c9cad0; }
.bodyscale .mark { position: absolute; top: -4px; bottom: -4px; width: 4px; margin-left: -2px; background: #fff; border-radius: 2px;
  box-shadow: 0 0 10px #fff; transition: left .3s, opacity .3s; }
@media (max-width: 720px) { .board, .rcd-board { grid-template-columns: 1fr; } }

/* ---- N2 · símbolos ---- */
.symgrid { display: grid; grid-template-columns: repeat(auto-fill, minmax(118px, 1fr)); gap: 10px; margin: 14px 0 8px; }
.symcard { font: inherit; background: var(--ce-card); border: 1px solid var(--ce-line); border-radius: 12px; color: var(--ce-text);
  padding: 12px 8px 10px; display: flex; flex-direction: column; align-items: center; gap: 6px; cursor: pointer; font-size: 12.5px;
  transition: border-color .16s, transform .12s; position: relative; }
.symcard:hover { border-color: var(--ce-accent); transform: translateY(-2px); }
.symcard.on { border-color: var(--ce-accent); background: var(--ce-accent-wash); }
.symcard.seen::after { content: '✓'; position: absolute; top: 6px; right: 8px; color: var(--ce-ok); font-size: 12px; }
.sym-svg { width: 56px; height: 56px; color: var(--ce-text); }
.sym-svg.big { width: 160px; height: 160px; }
.game { display: grid; grid-template-columns: 220px 1fr; gap: 24px; align-items: center; background: var(--ce-bg2);
  border: 1px solid var(--ce-line); border-radius: var(--ce-r-lg); padding: 20px; margin: 14px 0; }
.game-sym { display: grid; place-items: center; min-height: 180px; background: var(--ce-card); border-radius: 12px; }
.game-sym .big { font-size: 48px; font-weight: 800; color: var(--ce-accent); }
.game-score { color: var(--ce-muted); margin: 0 0 10px; }
.game .next { margin-top: 12px; }
@media (max-width: 600px) { .game { grid-template-columns: 1fr; } }
.uni-svg { color: var(--ce-text); }
.uni-svg .ln, .uni-svg .uni > path, .uni-svg .sl { stroke: currentColor; stroke-width: 2.4; fill: none; }
.uni { cursor: pointer; }
.uni .hit { fill: transparent; stroke: transparent; }
.uni .hit.box { stroke: var(--ce-muted2); fill: var(--ce-card); }
.uni:hover .hit { stroke: var(--ce-line); }
.uni.sel { color: var(--ce-accent); }
.uni.sel .hit { stroke: var(--ce-accent); fill: var(--ce-accent-wash); }

/* ---- N4 · trifásica y cuadro ---- */
.legend { display: flex; gap: 16px; flex-wrap: wrap; font-size: 13px; color: var(--ce-muted); margin: 4px 0 10px; }
.legend i, .phb-l i { display: inline-block; width: 14px; height: 4px; border-radius: 2px; vertical-align: middle; margin-right: 6px; }
.focos { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 8px; margin: 14px 0; }
.foco { font: inherit; text-align: left; background: var(--ce-card); border: 1px solid var(--ce-line); border-left: 4px solid var(--pc, #888);
  border-radius: 10px; color: var(--ce-text); padding: 9px 12px; cursor: pointer; display: grid; grid-template-columns: 1fr auto;
  gap: 2px 8px; transition: border-color .16s; }
.foco:hover { border-color: var(--ce-accent); border-left-color: var(--pc); }
.foco span { font-size: 13px; font-weight: 600; } .foco small { color: var(--ce-muted); font-size: 12px; grid-column: 1; }
.foco b { grid-row: 1 / 3; grid-column: 2; align-self: center; font-size: 15px; color: var(--pc); }
.phbars { display: grid; gap: 8px; max-width: 640px; margin: 8px 0; }
.phb { display: grid; grid-template-columns: 54px 1fr 70px; gap: 12px; align-items: center; font-size: 13px; }
.phb b { text-align: right; font-variant-numeric: tabular-nums; }
.phb.over b { color: var(--ce-accent); }
.phb-t { position: relative; height: 12px; border-radius: 6px; background: var(--ce-input); }
.phb-t i { display: block; height: 100%; border-radius: 6px; transition: width .3s, background .3s; }
.phb-t em { position: absolute; top: -4px; bottom: -4px; width: 2px; background: var(--ce-accent); }
.phb.neu { opacity: .85; }
.mission .checks { list-style: none; padding: 0; margin: 6px 0 0; font-size: 14px; color: var(--ce-muted); }
.mission .checks li { margin: 4px 0; } .mission .checks li.ok { color: var(--ce-ok); }
.cuadro { display: flex; gap: 12px; align-items: flex-start; margin: 14px 0; flex-wrap: wrap; background: var(--ce-bg2);
  border: 1px solid var(--ce-line); border-radius: var(--ce-r-lg); padding: 14px; }
.cuadro .cab { flex: 1 1 100%; max-width: 820px; margin: 0 auto; min-width: 0; }
.cuadro .dps { flex: 1 1 100%; max-width: 760px; margin: 0 auto; display: grid; grid-template-columns: 1fr 1fr; gap: 6px; }
.cuadro figure { margin: 0; display: flex; flex-direction: column; gap: 6px; align-items: center; }
.cuadro figcaption { font-size: 11px; color: var(--ce-muted); text-align: center; }
.pw-board, .pw-dp { width: 100%; height: auto; display: block; filter: drop-shadow(0 10px 20px rgba(0,0,0,.45)); }
.cab.dead .din:not([data-id="rcd"]) { opacity: .55; }
.din { cursor: pointer; }
.din .cap { transition: transform .17s cubic-bezier(.34,1.4,.5,1); }
.din:not(.on) .cap { transform: translateY(11px); }
.din.on .mk-off, .din:not(.on) .mk-on { display: none; }
.din:hover .din-hit { stroke: var(--ce-accent); stroke-width: 2.5; }
.pw-test { cursor: pointer; }
.rock { cursor: pointer; } .rock .r-top { fill: #25262b; } .rock .r-bot { fill: #5d5f66; }
.rock.on .r-top { fill: #5d5f66; } .rock.on .r-bot { fill: #25262b; }
.rock:hover > rect:first-child { stroke: var(--ce-accent); }
.pw-dp .g-led { fill: #12301c; }
.pw-dp .phase { fill: #4a1512; stroke: #111; stroke-width: 1; }
.pw-dp.mains .phase { fill: #ff3b2f; filter: drop-shadow(0 0 4px #ff3b2f); }

/* ---- N5 · estudio ---- */
.note.avh { border-left-color: #f59e0b; }
.note.avh a { color: #f59e0b; }
.ce-seg + .ce-seg { margin-left: 8px; }
.res { fill: var(--ce-card-hi); stroke: var(--ce-muted); stroke-width: 1.5; }
.sig { fill: none; stroke: var(--ce-accent); stroke-width: 2; }
.wire2 { fill: none; stroke: var(--cu); stroke-width: 4; }
.vu-bg { fill: var(--ce-input); } .vu { fill: var(--ce-ok); transition: height .2s, y .2s; }
.spk-row { display: flex; gap: 12px; align-items: center; flex-wrap: wrap; margin: 14px 0; }
.amp { background: var(--ce-card); border: 1px solid var(--ce-line); border-radius: 10px; padding: 14px 16px; font-weight: 700;
  text-align: center; font-size: 13px; transition: .2s; } .amp small { color: var(--ce-muted); font-weight: 400; }
.amp.hot { border-color: var(--ce-accent); box-shadow: 0 0 18px rgba(255,90,77,.5); color: var(--ce-accent); }
.spk { width: 74px; height: 96px; border-radius: 10px; background: #1a1b20; border: 1px solid var(--ce-line); display: grid;
  place-items: center; position: relative; }
.spk i { width: 46px; height: 46px; border-radius: 50%; background: radial-gradient(circle, #555 0 22%, #2a2b31 23% 100%);
  box-shadow: 0 0 calc(var(--g) * 24px) rgba(255,90,77,calc(var(--g) * .8)); animation: thump calc(.35s + (1 - var(--g)) * .5s) infinite alternate; }
.spk small { position: absolute; bottom: 4px; font-size: 11px; color: var(--ce-muted); }
@keyframes thump { to { transform: scale(calc(1 + var(--g) * .08)); } }
.coax { fill: #22252c; stroke: #3a3e48; }
.term { fill: var(--ce-card); stroke: var(--ce-accent); stroke-width: 1.5; }
.pulse { stroke: #ffe38a; stroke-width: 3; }
.lvl-bar { margin: 18px 0 62px; }
.lvl-t { position: relative; height: 14px; border-radius: 7px; background: linear-gradient(90deg, #1f3a26, #4a4320 55%, #7a1f1a); }
.lvl-t i { position: absolute; top: -6px; bottom: -6px; width: 4px; margin-left: -2px; background: #fff; border-radius: 2px; box-shadow: 0 0 8px #fff; }
.lvl-t span { position: absolute; top: 18px; transform: translateX(-50%); font-size: 11px; color: var(--ce-muted); white-space: nowrap;
  border-left: 1px solid var(--ce-muted2); padding-left: 4px; }
.lvl-t span b { font-weight: 500; }
.tr2 { stroke: #ff5a4d; stroke-width: 2.4; } .tr3 { stroke: #4a9eff; stroke-width: 2.4; } .trd { stroke: #3fb950; stroke-width: 3; }
.shield { fill: none; stroke: #9aa0ab; stroke-width: 3; stroke-dasharray: 2 4; }
.earth { fill: none; stroke: #2fa84f; stroke-width: 4; }
.loopline { stroke: #ff5a4d; stroke-width: 2; stroke-dasharray: 8 6; animation: dash 1s linear infinite; }
@keyframes dash { to { stroke-dashoffset: -28; } }
.hum { display: flex; align-items: center; gap: 12px; font-size: 13px; color: var(--ce-muted); margin: 10px 0; flex-wrap: wrap; }
.hum b { color: var(--ce-text); min-width: 60px; }
.illegal { fill: rgba(255,90,77,.08); }
.gstrip, .frames { display: grid; grid-template-columns: repeat(6, 1fr); height: 46px; border-radius: 8px; overflow: hidden;
  border: 1px solid var(--ce-line); margin: 8px 0 14px; max-width: 540px; }
.frames { grid-template-columns: repeat(24, 1fr); gap: 2px; background: #000; height: 40px; max-width: none; }
.win { fill: rgba(74,158,255,.18); stroke: #4a9eff; stroke-width: 1; }