/*!
 * SciParaTodos · Simulador del Efecto Fotoeléctrico — estilos
 */
:root{
  --bg:#eef4fb; --bg2:#e3ecf7; --card:#fff; --tx:#10233f; --tx2:#4b5b72; --tx3:#6b7a90; --line:#dbe3ee;
  --acc:#6d4ae8; --acc2:#f1ecff; --red:#e5484d; --navy:#0f1c3a;
  --ok:#0f8a5f; --okbg:#e6f6ef; --warn:#b45309; --warnbg:#fff4e5; --bad:#c2410c; --badbg:#fff1ec;
  --r:18px; --mono:'JetBrains Mono',ui-monospace,Consolas,monospace;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--tx);font-family:'Nunito Sans',system-ui,-apple-system,'Segoe UI',Roboto,Arial,sans-serif;font-size:16px;line-height:1.55}
.wrap{max-width:1320px;margin:0 auto;padding:0 28px}
button,input,select{font:inherit;color:inherit}
a{color:var(--acc)}
img{max-width:100%}

/* ---------- navegación ---------- */
.nav{position:sticky;top:0;z-index:20;background:rgba(255,255,255,.92);backdrop-filter:saturate(1.4) blur(10px);-webkit-backdrop-filter:saturate(1.4) blur(10px);border-bottom:1px solid var(--line)}
.nav-in{display:flex;align-items:center;gap:20px;min-height:72px}
.brand{display:flex;align-items:center;gap:12px;text-decoration:none;color:var(--tx)}
.logo{height:52px;width:auto}
.logo.sm{height:36px}
.brand-tx{display:flex;flex-direction:column;line-height:1.25}
.brand-tx b{font-weight:800;font-size:15px}
.brand-tx small{color:var(--tx3);font-size:13px}
.links{display:flex;gap:4px;margin-left:auto}
.links a{text-decoration:none;color:var(--tx2);font-weight:700;font-size:15px;padding:8px 12px;border-radius:10px}
.links a:hover{background:var(--acc2);color:var(--acc)}
.lang{display:flex;gap:6px}
.lang button{min-width:44px;height:40px;border-radius:12px;border:1px solid var(--line);background:#fff;font-weight:800;cursor:pointer}
.lang button.on{background:var(--acc);color:#fff;border-color:var(--acc)}

/* ---------- hero ---------- */
.hero{position:relative;overflow:hidden;color:#fff;
  background:radial-gradient(1200px 500px at 85% 10%,rgba(109,74,232,.45),transparent 60%),
             radial-gradient(900px 500px at 0% 100%,rgba(21,134,181,.35),transparent 60%),
             linear-gradient(160deg,#0b1430 0%,#13224a 55%,#1b2f63 100%)}
.hero-in{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.05fr);gap:34px;align-items:center;padding:64px 28px 72px}
.tag{display:inline-block;background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.22);padding:6px 14px;border-radius:999px;font-weight:700;font-size:13px;letter-spacing:.04em}
.hero h1{font-size:clamp(32px,5vw,56px);line-height:1.06;margin:18px 0 16px;font-weight:900;letter-spacing:-.01em}
.hero .lead{font-size:18px;color:#d6def0;margin:0 0 16px;max-width:620px}
.hero .lead b{color:#fff}
.autores{margin:0 0 26px;font-weight:700;color:#bcc8e4;font-size:15px}
.cta{display:flex;flex-wrap:wrap;gap:12px}
.chips{list-style:none;display:flex;flex-wrap:wrap;gap:10px;padding:0;margin:26px 0 0}
.chips li{font-size:14px;font-weight:700;color:#d6def0;background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.14);padding:6px 12px;border-radius:10px}
.hero-img img{display:block;width:100%;height:auto;border-radius:22px;box-shadow:0 30px 60px -20px rgba(0,0,0,.55),0 0 0 1px rgba(255,255,255,.08)}

/* ---------- botones ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;border:1px solid var(--line);background:#fff;border-radius:12px;padding:10px 16px;font-weight:800;cursor:pointer;text-decoration:none;color:var(--tx);transition:transform .08s,box-shadow .15s}
.btn:hover{box-shadow:0 4px 14px -6px rgba(16,35,63,.35)}
.btn:active{transform:translateY(1px)}
.btn:disabled{opacity:.45;cursor:not-allowed;box-shadow:none}
.btn.pri{background:var(--acc);border-color:var(--acc);color:#fff}
.btn.ghost{background:transparent;border-color:rgba(255,255,255,.4);color:#fff}
.btn.big{padding:14px 22px;font-size:17px;border-radius:14px}
.btn.on{background:var(--acc2);border-color:var(--acc);color:var(--acc)}

/* ---------- secciones ---------- */
.sec{padding:72px 0}
.sec.alt{background:var(--bg2)}
.sh{max-width:760px;margin:0 0 30px}
.stag{color:#1a7fa3;font-weight:900;letter-spacing:.14em;text-transform:uppercase;font-size:13px}
.sh h2{font-size:clamp(26px,3.4vw,38px);line-height:1.15;margin:6px 0 8px;font-weight:900}
.sh p{margin:0;color:var(--tx2)}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:22px;box-shadow:0 1px 2px rgba(16,35,63,.04)}
.card h3{margin:0 0 14px;font-size:19px;font-weight:900}

/* ---------- laboratorio ---------- */
.lab{display:grid;grid-template-columns:minmax(0,1fr) 340px;gap:20px;align-items:start}
.escena{padding:14px}
.lienzo{position:relative;border-radius:14px;overflow:hidden;background:#e9eff6;user-select:none;-webkit-user-select:none}
#cv{display:block;width:100%;touch-action:none;cursor:default}
.estado{position:absolute;top:12px;left:12px;font-size:13px;font-weight:800;color:#fff;background:rgba(15,28,58,.78);padding:5px 12px;border-radius:999px;pointer-events:none}
.estado.osc{background:rgba(180,83,9,.9)}
.estado.rep{background:rgba(15,138,95,.9)}
.crono{position:absolute;top:10px;right:10px;display:flex;align-items:center;gap:6px;background:rgba(15,28,58,.86);border-radius:14px;padding:5px 6px 5px 14px}
.crono-t{font-family:var(--mono);font-weight:700;font-size:clamp(15px,2.2vw,24px);color:#fff;letter-spacing:.05em;min-width:6.4em}
.crono button{width:34px;height:34px;border-radius:10px;border:0;background:rgba(255,255,255,.14);color:#fff;font-weight:900;cursor:pointer;font-size:14px}
.crono button:hover{background:rgba(255,255,255,.26)}
.crono button.on{background:#e5484d}
.mensaje{position:absolute;left:12px;right:12px;bottom:12px;font-weight:700;font-size:14px;border-radius:12px;padding:10px 14px;display:none;pointer-events:none}
.mensaje.bad{display:block;background:rgba(255,241,236,.97);color:#9a3412;border:1px solid #fdba8c}
.mensaje.info{display:block;background:rgba(255,255,255,.95);color:var(--tx)}
.toast{position:absolute;left:50%;top:56px;transform:translate(-50%,-8px);background:#10233f;color:#fff;font-weight:700;font-size:14px;padding:9px 16px;border-radius:12px;opacity:0;transition:opacity .2s,transform .2s;pointer-events:none;max-width:86%;text-align:center}
.toast.on{opacity:1;transform:translate(-50%,0)}
.ayuda{font-size:14px;color:var(--tx2);margin:10px 4px 0}
.ayuda b{color:var(--tx)}
.lecturas{display:grid;grid-template-columns:repeat(6,minmax(0,1fr));gap:8px;margin-top:12px}
.lecturas div{background:#f4f7fb;border-radius:12px;padding:8px 10px;min-width:0}
.lecturas span{display:block;font-size:12px;color:var(--tx3);font-weight:700;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.lecturas b{font-family:var(--mono);font-size:15px;white-space:nowrap}
.lecturas b.oc{color:var(--tx3);font-family:inherit;font-style:italic;font-weight:700}

.panel{background:linear-gradient(180deg,#14234a,#0f1c3a);color:#e6ecf8;border-color:#1f3263}
.panel h3{color:#fff;margin:0}
.panel-h{display:flex;justify-content:space-between;align-items:center;margin-bottom:14px}
.badge{font-size:11px;font-weight:900;letter-spacing:.08em;text-transform:uppercase;background:rgba(255,255,255,.14);padding:4px 10px;border-radius:999px}
.badge.run{background:#0f9f6e;color:#fff}
.botones{display:grid;grid-template-columns:1fr 48px;gap:8px}
.botones .btn{padding:11px}
#b-play{background:#fff;color:var(--navy);border-color:#fff}
#b-reset{background:transparent;color:#fff;border-color:rgba(255,255,255,.3);font-size:18px}
.vel{display:grid;grid-template-columns:repeat(4,1fr);gap:4px;margin:10px 0 14px;background:rgba(255,255,255,.06);padding:4px;border-radius:12px}
.vel button{border:0;background:transparent;color:#c9d5ea;font-weight:800;border-radius:9px;padding:6px 0;cursor:pointer}
.vel button.on{background:#fff;color:var(--navy)}
.campo{display:block;margin:0 0 12px}
.campo>span{display:block;font-size:13px;font-weight:700;margin-bottom:5px;color:#c9d5ea}
.campo select{width:100%;padding:9px 10px;border-radius:10px;border:1px solid rgba(255,255,255,.18);background:#1b2c57;color:#fff}
.seg{display:grid;grid-template-columns:repeat(3,1fr);gap:4px;background:rgba(255,255,255,.06);padding:4px;border-radius:12px}
.seg button{border:0;background:transparent;color:#c9d5ea;font-weight:800;font-size:13px;border-radius:9px;padding:7px 2px;cursor:pointer}
.seg button.on{background:#fff;color:var(--navy)}
.desl{margin:0 0 10px;padding-top:8px;border-top:1px solid rgba(255,255,255,.08)}
.dl-h{display:flex;justify-content:space-between;font-size:13px;font-weight:700;color:#c9d5ea}
.dl-h b{color:#7ee2b8;font-family:var(--mono);font-size:13px}
.desl input{width:100%;accent-color:#8f74ff;margin:6px 0 0}
.chks{display:grid;grid-template-columns:1fr 1fr;gap:8px 12px;margin:8px 0 10px}
.chk{display:flex;align-items:center;gap:6px;font-size:14px;font-weight:700;cursor:pointer}
.chk input{width:16px;height:16px;accent-color:#8f74ff;flex:none}
.acc{display:grid;grid-template-columns:1fr 1fr;gap:6px}
.btn.sm{padding:8px 8px;font-size:13px;border-radius:10px;background:rgba(255,255,255,.08);border-color:rgba(255,255,255,.18);color:#fff;text-align:center;line-height:1.25}
.btn.sm:hover{background:rgba(255,255,255,.16)}
.hmin{font-size:13px;color:#c9d5ea;margin:12px 0 0;background:rgba(255,255,255,.06);border-radius:10px;padding:8px 10px}
.hmin b{color:#fff}

.lab2{display:grid;grid-template-columns:minmax(0,6fr) minmax(0,5fr);gap:20px;margin-top:20px;align-items:start}
.nota{color:var(--tx2);font-size:14px;margin:0 0 12px}
.nota b{color:var(--tx)}
.l0{display:flex;flex-wrap:wrap;align-items:center;gap:8px 12px;background:#f4f7fb;border-radius:12px;padding:10px 12px;margin-bottom:12px;font-weight:700;font-size:14px}
.l0 input,.tdat input{width:7.5em;padding:7px 9px;border-radius:9px;border:1px solid #c9d5e4;background:#fff;font-family:var(--mono);font-size:14px;text-align:right}
.l0 input:focus,.tdat input:focus{outline:2px solid var(--acc);outline-offset:1px;border-color:var(--acc)}
.l0-ok{font-size:13px}
.l0-ok.ok,.tdat td.ok{color:var(--ok)}
.l0-ok.mal,.tdat td.mal{color:var(--bad)}
.tdat td.casi{color:var(--warn)}
.acts{display:flex;flex-wrap:wrap;gap:10px;margin-top:12px}
.acts:first-of-type{margin-top:0}
.tdat{width:100%;border-collapse:collapse;font-size:14px;margin-top:12px;min-width:520px}
.tdat th,.tdat td{padding:7px 8px;border-bottom:1px solid var(--line);text-align:right;white-space:nowrap}
.tdat th{background:#f4f7fb;font-weight:800;font-size:13px}
.tdat td{font-family:var(--mono);font-size:13px}
.tdat td:first-child,.tdat th:first-child{text-align:center;color:var(--tx3)}
.tdat .col-real{display:none}
.tdat.comp .col-real{display:table-cell}
.tdat .del{border:0;background:transparent;color:var(--tx3);cursor:pointer;font-size:16px;padding:2px 6px;border-radius:6px}
.tdat .del:hover{background:#fdeceb;color:var(--red)}
.vacio{color:var(--tx3);font-size:14px;margin:10px 0 0;text-align:center}
.ajuste{margin-top:12px;background:var(--acc2);border-radius:12px;padding:10px 14px;font-size:14px;color:#3b2a8f;line-height:1.7}
.ajuste b{color:#2a1b78}
.tabs{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:12px}
.tabs button{border:1px solid var(--line);background:#fff;border-radius:999px;padding:6px 14px;font-weight:800;font-size:14px;cursor:pointer;color:var(--tx2)}
.tabs button.on{background:var(--acc);border-color:var(--acc);color:#fff}
.graf{display:block;width:100%}
.leyenda{display:flex;flex-wrap:wrap;gap:14px;font-size:13px;margin-top:6px}
.leyenda i{display:inline-block;width:18px;height:3px;border-radius:2px;vertical-align:middle;margin-right:5px}
.leyenda i.pt{width:9px;height:9px;border-radius:50%}
.leyenda i.dash{background:repeating-linear-gradient(90deg,currentColor 0 5px,transparent 5px 8px)!important}

.pred{margin-top:20px}
.formulas{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:12px}
.formulas div{background:var(--acc2);color:#3b2a8f;font-weight:700;font-size:14px;border-radius:10px;padding:6px 12px}
.tscroll{overflow-x:auto}
.pred table{width:100%;border-collapse:collapse;font-size:14px;min-width:720px}
.pred th,.pred td{padding:9px 8px;border-bottom:1px solid var(--line);text-align:right;white-space:nowrap}
.pred th:first-child,.pred td:first-child{text-align:left}
.pred th:nth-child(2),.pred td:nth-child(2){text-align:left}
.pred th{background:#f4f7fb;font-weight:800}
.pred td{font-family:var(--mono);font-size:13px}
.pred td:first-child{font-family:inherit;font-size:14px;font-weight:700}
.pred td.ok{color:var(--ok)}
.pred td.muted{color:var(--tx3);font-family:inherit;font-style:italic}
.pred .nota{margin:12px 0 0}
.foot{color:var(--tx3);font-size:13px;margin:18px 0 0}

/* ---------- teoría ---------- */
.cards3{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}
.tc{background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:22px}
.tc h3{margin:12px 0 8px;font-size:18px;font-weight:900}
.tc p{margin:0;color:var(--tx2)}
.tc p b{color:var(--tx)}
.ico{width:46px;height:46px;border-radius:14px;display:grid;place-items:center;font-weight:900;font-size:20px;color:#fff;background:linear-gradient(135deg,var(--acc),#1586b5);font-style:italic}
.figs{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px;margin-top:18px}
.figs figure{margin:0}
.figs svg{width:100%;height:auto;display:block}
.figs figcaption{color:var(--tx2);font-size:14px;margin-top:8px}

/* ---------- actividades ---------- */
.act .ac{background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:22px;display:flex;flex-direction:column}
.ac .num{font-weight:900;color:var(--acc);font-size:13px;letter-spacing:.1em}
.ac h3{margin:4px 0 12px;font-size:18px;font-weight:900}
.ac h4{margin:10px 0 6px;font-size:14px;font-weight:900;color:var(--tx2);text-transform:uppercase;letter-spacing:.06em}
.ac ol,.ac ul{margin:0;padding-left:20px;color:var(--tx2)}
.ac li{margin:3px 0}
.ac .btn{margin-top:auto;align-self:flex-start}
.ac .esp{flex:1;min-height:14px}

/* ---------- preguntas ---------- */
.faq{display:grid;gap:12px;max-width:900px}
.faq details{background:#fff;border:1px solid var(--line);border-radius:14px;padding:16px 20px}
.faq summary{font-weight:800;cursor:pointer;font-size:17px}
.faq p{margin:10px 0 0;color:var(--tx2)}

/* ---------- pie ---------- */
.ft{background:var(--navy);color:#c9d5e4;padding:40px 0 28px}
.ft-in{display:grid;grid-template-columns:1fr auto;gap:20px}
.ft .brand{color:#fff}
.ft p{margin:10px 0 0;max-width:460px;font-size:14px}
.ft-links{display:flex;flex-wrap:wrap;gap:16px;align-items:flex-start}
.ft-links a{color:#fff;text-decoration:none;font-weight:700;font-size:14px}
.copy{grid-column:1/-1;border-top:1px solid rgba(255,255,255,.12);padding-top:16px;font-size:13px}

/* ---------- responsivo ---------- */
@media (max-width:1100px){
  .lab{grid-template-columns:minmax(0,1fr)}
  .lab2{grid-template-columns:minmax(0,1fr)}
  .lecturas{grid-template-columns:repeat(3,minmax(0,1fr))}
  .figs{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:900px){
  .hero-in{grid-template-columns:minmax(0,1fr);padding:44px 28px 52px}
  .cards3{grid-template-columns:repeat(2,minmax(0,1fr))}
  .figs{grid-template-columns:minmax(0,1fr)}
  .links{display:none}
  .lang{margin-left:auto}
}
@media (max-width:600px){
  .wrap{padding:0 16px}
  .hero-in{padding:36px 16px 44px}
  .cards3{grid-template-columns:minmax(0,1fr)}
  .lecturas{grid-template-columns:repeat(2,minmax(0,1fr))}
  .sec{padding:52px 0}
  .card{padding:16px}
  .escena{padding:8px}
  .ft-in{grid-template-columns:minmax(0,1fr)}
  .logo{height:42px}
  .estado{top:6px;left:6px;font-size:11px;padding:3px 8px}
  .crono{top:6px;right:6px;padding:3px 4px 3px 9px;gap:4px}
  .crono-t{font-size:13px}
  .crono button{width:26px;height:26px;font-size:12px}
  .mensaje{font-size:12px;padding:6px 9px;left:6px;right:6px;bottom:6px}
  .toast{font-size:12px;top:40px}
}

/* ---------- específicos: primera ley ---------- */
.reloj{position:absolute;top:10px;right:10px;font-family:var(--mono);font-weight:700;font-size:clamp(14px,2vw,22px);color:#fff;background:rgba(15,28,58,.82);padding:5px 12px;border-radius:12px;letter-spacing:.05em;pointer-events:none}
.estado.tr{background:rgba(180,83,9,.9)}
.estado.eq{background:rgba(15,138,95,.9)}
.estado.bq{background:rgba(109,74,232,.92)}
.seg.seg2{grid-template-columns:repeat(2,1fr)}
.seg button:disabled{opacity:.4;cursor:not-allowed}
.desl.off{opacity:.45}
.dl-ext{display:flex;justify-content:space-between;align-items:center;font-size:12px;color:#9fb0cc;margin-top:2px}
.dl-ext button{border:1px solid rgba(255,255,255,.25);background:transparent;color:#fff;border-radius:8px;font-size:12px;font-weight:800;padding:2px 10px;cursor:pointer}
.chks{grid-template-columns:1fr}
.tramo-h{display:flex;flex-wrap:wrap;justify-content:space-between;align-items:center;gap:8px;margin-bottom:6px}
.tramo-h h3{margin:0}
.tipo{font-size:12px;font-weight:900;letter-spacing:.06em;text-transform:uppercase;color:#fff;background:#6b7a90;padding:5px 12px;border-radius:999px}
.barras{display:flex;flex-direction:column;gap:12px;margin:14px 0 8px}
.barra{display:grid;grid-template-columns:88px minmax(0,1fr) 100px;gap:10px;align-items:center;font-size:14px}
.barra .nm{font-weight:800;color:var(--tx2)}
.barra .tr{position:relative;height:20px;background:#eef2f8;border-radius:6px;overflow:hidden}
.barra .tr::after{content:'';position:absolute;left:50%;top:0;bottom:0;width:2px;background:#8fa3bd}
.barra .fl{position:absolute;top:2px;bottom:2px;border-radius:4px}
.barra .vl{font-family:var(--mono);font-size:14px;font-weight:700;text-align:right}
.ecuacion{font-family:var(--mono);font-size:15px;font-weight:700;background:var(--acc2);color:#3b2a8f;border-radius:12px;padding:10px 14px;margin:12px 0;overflow-x:auto;white-space:nowrap}
.ciclo{background:var(--okbg);color:#0b5c40;border-radius:12px;padding:10px 14px;font-weight:700;font-size:14px;margin:12px 0 0}
.ciclo:empty{display:none}
.pred td .chip{display:inline-block;width:10px;height:10px;border-radius:3px;margin-right:6px;vertical-align:middle}
.pred tr.tot td{font-weight:800;background:#f4f7fb}
@media (max-width:600px){
  .barra{grid-template-columns:62px minmax(0,1fr) 84px;font-size:13px}
  .reloj{top:6px;right:6px;font-size:13px;padding:3px 8px}
}

#simulador .lab2{grid-template-columns:minmax(0,5fr) minmax(0,7fr)}
@media (max-width:1100px){#simulador .lab2{grid-template-columns:minmax(0,1fr)}}

/* ---------- específicos: gases ideales ---------- */
.casos{display:grid;grid-template-columns:repeat(6,minmax(0,1fr));gap:10px;margin:0 0 18px}
.casos button{display:flex;flex-direction:column;align-items:flex-start;gap:3px;text-align:left;border:1px solid var(--line);background:#fff;border-radius:14px;padding:11px 13px;cursor:pointer;transition:box-shadow .15s,border-color .15s}
.casos button b{font-size:15px;font-weight:900;color:var(--tx)}
.casos button small{font-size:12px;color:var(--tx3);font-weight:700;line-height:1.35}
.casos button:hover{box-shadow:0 4px 14px -6px rgba(16,35,63,.3)}
.casos button.on{background:var(--acc);border-color:var(--acc)}
.casos button.on b,.casos button.on small{color:#fff}
.dl-r{display:flex;justify-content:space-between;font-size:11px;color:#8ea0c0;margin-top:1px}
.dl-r em{font-style:normal;font-weight:900;color:#ffd166;text-transform:uppercase;letter-spacing:.06em}
.desl.lock input{opacity:.35;pointer-events:none}
.desl.lock .dl-h b{color:#c9d5ea}
.ley{font-family:var(--mono);font-size:14px;font-weight:700;background:var(--acc2);color:#3b2a8f;border-radius:12px;padding:10px 14px;margin:10px 0 12px;overflow-x:auto;white-space:nowrap}
.mini{width:100%;border-collapse:collapse;font-size:13px;margin-bottom:10px}
.mini th,.mini td{padding:6px 8px;border-bottom:1px solid var(--line);text-align:right;white-space:nowrap}
.mini th:first-child,.mini td:first-child{text-align:left}
.mini th{background:#f4f7fb;font-weight:800;font-size:12px}
.mini td{font-family:var(--mono)}
.mini td:first-child{font-family:inherit;font-weight:800}
.gnota{margin:8px 0 0;font-size:13px}
.med{margin-top:20px}
.med .tdat{min-width:760px}
.tdat td.caso{font-family:inherit;font-weight:700;color:var(--tx2);text-align:left}
.reto{max-width:980px}
.reto-h{display:flex;flex-wrap:wrap;justify-content:space-between;align-items:center;gap:10px}
.marcador{font-weight:900;color:var(--acc);font-size:14px}
.reto-q{font-size:19px;font-weight:700;line-height:1.5;margin:14px 0 16px}
.reto-in{display:flex;flex-wrap:wrap;align-items:center;gap:10px}
.reto-in input{width:10em;padding:11px 12px;border-radius:12px;border:1px solid #c9d5e4;font-family:var(--mono);font-size:17px;text-align:right}
.reto-in input:focus{outline:2px solid var(--acc);outline-offset:1px}
.reto-u{font-weight:800;color:var(--tx2);min-width:2.4em}
.reto-msg{margin:14px 0 0;font-weight:700;font-size:15px;border-radius:12px;padding:0}
.reto-msg.ok{background:var(--okbg);color:#0b5c40;padding:10px 14px}
.reto-msg.mal{background:var(--badbg);color:#9a3412;padding:10px 14px}
.reto-msg.pista{background:var(--warnbg);color:#7c3a06;padding:10px 14px}
@media (max-width:1100px){.casos{grid-template-columns:repeat(3,minmax(0,1fr))}}
@media (max-width:600px){
  .casos{grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}
  .casos button{padding:9px 10px}
  .casos button b{font-size:14px}
  .reto-q{font-size:17px}
}
.lecturas b small{display:block;font-size:11px;color:var(--tx3);font-weight:700}
@media (max-width:600px){.mini th,.mini td{padding:5px 5px;font-size:12px}}

/* ---------- específicos 3D (fotoeléctrico) ---------- */
.lienzo3d{position:relative;aspect-ratio:16/9;border-radius:14px;overflow:hidden;background:#0b1430;user-select:none;-webkit-user-select:none}
.lienzo3d .gl{position:absolute;inset:0;width:100%!important;height:100%!important;display:block;touch-action:none;cursor:grab}
.lienzo3d .gl:active{cursor:grabbing}
.etq-capa{position:absolute;inset:0;pointer-events:none;z-index:2}
.etq3d{font:800 12px 'Nunito Sans',system-ui,sans-serif;color:#fff;background:rgba(15,28,58,.78);border:1px solid rgba(255,255,255,.18);padding:3px 9px;border-radius:999px;white-space:nowrap}
.etq3d.luz{background:rgba(109,74,232,.88)}
.etq3d.tenue{background:transparent;border:0;color:rgba(255,255,255,.5);font-weight:700;letter-spacing:.12em;text-transform:uppercase;font-size:11px}
.lienzo3d .estado,.lienzo3d .vistas,.lienzo3d .lento,.lienzo3d .toast,.lienzo3d .sin3d{z-index:3}
.estado.no{background:rgba(107,122,144,.92)}
.vistas{position:absolute;left:10px;bottom:10px;display:flex;flex-wrap:wrap;gap:4px;background:rgba(15,28,58,.72);padding:4px;border-radius:12px}
.vistas button{border:0;background:transparent;color:#c9d5ea;font-weight:800;font-size:12px;padding:6px 10px;border-radius:9px;cursor:pointer}
.vistas button.on{background:#fff;color:var(--navy)}
.lento{position:absolute;right:10px;bottom:12px;font-size:11px;font-weight:700;color:rgba(255,255,255,.6);pointer-events:none}
.sin3d{display:none;position:absolute;inset:0;align-items:center;justify-content:center;text-align:center;padding:30px;color:#fff;font-weight:700}
.lienzo3d.no3d .sin3d{display:flex}
.espectro{position:relative;height:12px;border-radius:999px;margin:8px 0 0;box-shadow:inset 0 0 0 1px rgba(255,255,255,.15)}
.umbral{position:absolute;top:-4px;bottom:-4px;width:3px;margin-left:-1.5px;background:#fff;border-radius:2px;box-shadow:0 0 0 1px #0f1c3a}
.umbral::after{content:'λ₀';position:absolute;top:-16px;left:50%;transform:translateX(-50%);font-size:11px;font-weight:900;color:#fff}
.r-esp{margin-top:2px!important}
.fino{display:grid;grid-template-columns:repeat(5,1fr);gap:4px;margin-top:6px}
.fino button{border:1px solid rgba(255,255,255,.18);background:rgba(255,255,255,.07);color:#fff;border-radius:8px;font-weight:800;font-size:12px;padding:5px 0;cursor:pointer;font-family:var(--mono)}
.fino button:hover{background:rgba(255,255,255,.16)}
.chks{grid-template-columns:1fr 1fr}
.diag{display:block;width:100%;margin-top:6px}
.gacts{margin-top:8px}
.btn.sm2{padding:7px 12px;font-size:13px;border-radius:10px}
.tipo.si{background:#0f9f6e}
.tipo.no{background:#6b7a90}
.clasica td{white-space:normal!important;font-family:inherit!important;font-size:13.5px!important;text-align:left!important;vertical-align:top;min-width:150px}
.clasica th{text-align:left!important}
.clasica td.obs{color:var(--ok);font-weight:700}
.clasica td.cl{color:#9a3412}
.clasica table{min-width:760px}
.consts{margin:14px 0 0;font-size:13px}
.hmin .rev{margin-left:8px;border:1px solid rgba(255,255,255,.3);background:transparent;color:#fff;border-radius:8px;font-weight:800;font-size:12px;padding:2px 10px;cursor:pointer}
.med .tdat{min-width:720px}
.tdat td.aviso{color:var(--warn)}
@media (max-width:600px){
  .lienzo3d{aspect-ratio:4/3}
  .vistas{left:6px;bottom:6px;padding:3px}
  .vistas button{font-size:11px;padding:5px 7px}
  .lento{display:none}
  .etq3d{font-size:10px;padding:2px 6px}
  .chks{grid-template-columns:1fr}
}
#ecuacion{white-space:normal;line-height:1.5}

/* ---------- específicos: átomo de Bohr ---------- */
.seg.seg4{grid-template-columns:repeat(4,1fr)}
.seg.seg4 button{font-size:12px;padding:7px 0}
.bloque{display:none;margin:0 0 12px}
.bloque.on{display:block}
.mini-ayuda{font-size:12.5px;color:#aebbd4;margin:6px 0 8px;line-height:1.45}
.niveles{display:grid;grid-template-columns:repeat(4,1fr);gap:5px}
.niveles button{border:1px solid rgba(255,255,255,.2);background:rgba(255,255,255,.07);color:#fff;border-radius:10px;padding:7px 2px;font-weight:900;font-size:13px;cursor:pointer;line-height:1.15}
.niveles button small{display:block;font-family:var(--mono);font-weight:500;font-size:10.5px;color:#aebbd4}
.niveles button:hover{background:rgba(255,255,255,.16)}
.niveles button.on{background:#7dd3fc;color:var(--navy);border-color:#7dd3fc}
.niveles button.on small{color:#14345a}
.niveles button.ion{background:rgba(229,72,77,.18);border-color:rgba(229,72,77,.5)}
.chips-l{display:flex;flex-wrap:wrap;gap:5px}
.chips-l button{border:1px solid rgba(255,255,255,.22);background:rgba(255,255,255,.06);color:#fff;border-radius:999px;padding:4px 10px;font-size:12px;font-weight:800;cursor:pointer;display:inline-flex;align-items:center;gap:6px}
.chips-l button i{width:10px;height:10px;border-radius:50%;display:inline-block;box-shadow:0 0 0 1px rgba(255,255,255,.35)}
.chips-l button:hover{background:rgba(255,255,255,.16)}
.fino-l{grid-template-columns:1fr 1fr 1.6fr 1fr 1fr}
.fino-l input{min-width:0;border:1px solid rgba(255,255,255,.25);background:#0b1430;color:#fff;border-radius:8px;font-family:var(--mono);font-size:13px;text-align:center;padding:4px 2px}
.rango{display:flex;flex-wrap:wrap;gap:6px;margin:8px 0 2px}
.rango button{border:1px solid #d5deea;background:#fff;color:var(--tx2);border-radius:999px;padding:5px 12px;font-weight:800;font-size:12.5px;cursor:pointer}
.rango button.on{background:var(--navy);border-color:var(--navy);color:#fff}
.rango #b-limpiar{margin-left:auto}
.diag{cursor:pointer}
.graf{cursor:crosshair}
.etq3d.tenue2{background:rgba(15,28,58,.55);border-color:rgba(125,211,252,.25);color:#cfe3ff;font-size:11px;padding:2px 7px}
.etq3d.act{background:#7dd3fc;color:var(--navy);border-color:#7dd3fc}
.etq3d.e{background:rgba(21,134,181,.9)}
.lim-h{margin:18px 0 6px;font-size:16px}
.limites{margin:0;padding-left:20px;color:var(--tx2);font-size:14px;line-height:1.55}
.limites li{margin:4px 0}
.serie-ch{display:inline-block;padding:1px 8px;border-radius:999px;color:#fff;font-size:11.5px;font-weight:800;font-family:inherit}
.tdat select{font:inherit;font-family:var(--mono);padding:3px 4px;border-radius:8px;border:1px solid #c9d5e4;background:#fff}
@media (max-width:600px){
  .niveles button{font-size:12px}
  .seg.seg4 button{font-size:11px}
  .rango #b-limpiar{margin-left:0}
}