/* Recorrido 3D de arco eléctrico. Todo vive bajo .arc3d para no afectar los estilos del sitio. */
.arc3d{
  --bg:#061426; --line:rgba(91,181,206,.22); --line-2:rgba(229,184,102,.32);
  --ink:#eef4f7; --muted:#9fb7c4; --dim:#6f8797;
  --gold:#e5b866; --teal:#5bb5ce; --coral:#ff7a59; --teal-soft:rgba(91,181,206,.14);
  --r:14px; --r-lg:20px;
  --display:"Sora",system-ui,sans-serif; --body:"Manrope",system-ui,sans-serif;
  background:radial-gradient(circle at 85% -10%,rgba(33,118,175,.28),transparent 42%),var(--bg);
  color:var(--ink); font-family:var(--body); line-height:1.6; padding-block:64px;
}
.arc3d *{box-sizing:border-box}
.arc3d .arc3d-head{max-width:70ch;margin-bottom:8px}
.arc3d .arc3d-head .studies-eyebrow{color:var(--gold)}
.arc3d .arc3d-head h2{font:800 clamp(1.6rem,3vw,2.4rem)/1.15 var(--display);letter-spacing:-.03em;margin:.4rem 0 .6rem;color:var(--ink)}
.arc3d .arc3d-head p{color:var(--muted);margin:0}
.arc3d .steps{display:flex;flex-wrap:wrap;gap:8px;margin:18px 0 14px}
.arc3d .steps button{font:700 .8rem/1 var(--display);color:var(--muted);background:rgba(6,20,38,.7);border:1px solid var(--line);border-radius:999px;padding:.65rem .95rem;cursor:pointer;transition:background .2s,color .2s}
.arc3d .steps button:hover{color:var(--ink)}
.arc3d .steps button[aria-current="step"]{color:#061426;background:var(--gold);border-color:var(--gold)}
.arc3d button:focus-visible,.arc3d a:focus-visible{outline:2px solid var(--gold);outline-offset:2px}
.arc3d .stage{position:relative;border:1px solid var(--line);border-radius:var(--r-lg);overflow:hidden;background:linear-gradient(180deg,#0a223b,#071a2e);box-shadow:0 24px 70px rgba(0,0,0,.35)}
.arc3d .stage-head{display:flex;justify-content:space-between;align-items:center;gap:12px;padding:12px 16px;border-bottom:1px solid var(--line);font-size:.78rem;color:var(--muted)}
.arc3d .badge{font-family:var(--display);font-size:.66rem;letter-spacing:.14em;text-transform:uppercase;color:var(--gold);border:1px solid var(--line-2);padding:.25rem .6rem;border-radius:999px}
.arc3d .gl{display:block;width:100%;height:clamp(380px,62vh,640px);touch-action:pan-y;cursor:grab}
.arc3d .gl:active{cursor:grabbing}
.arc3d .poster{position:absolute;inset:44px 0 0;display:grid;place-items:center;color:var(--muted);font:700 .9rem var(--display)}
.arc3d .tag{position:absolute;left:0;top:0;pointer-events:none;transform:translate(-50%,-50%);font:700 .78rem/1.1 var(--display);padding:.35rem .6rem;border-radius:8px;background:rgba(6,20,38,.82);border:1px solid var(--line);white-space:nowrap;transition:opacity .35s;color:var(--ink)}
.arc3d .tag b{color:var(--ink)}
.arc3d .tag.nfpa{color:var(--gold);border-color:var(--line-2)} .arc3d .tag.ieee{color:var(--coral);border-color:rgba(255,122,89,.45)}
.arc3d .tag.man{font-size:.8rem;transform:translate(-50%,-100%)}
.arc3d .tag.man.alert{border-color:rgba(255,122,89,.7);box-shadow:0 0 0 3px rgba(255,122,89,.15)}
.arc3d .tag.hidden{opacity:0;visibility:hidden}
.arc3d .hud{position:absolute;left:14px;top:58px;width:min(300px,calc(100% - 28px));border:1px solid var(--line);border-radius:var(--r);background:rgba(6,20,38,.86);backdrop-filter:blur(6px);padding:14px 16px;pointer-events:none;transition:opacity .4s}
.arc3d .hud.off{opacity:0}
.arc3d .hud small{display:block;font:700 .66rem/1.3 var(--display);letter-spacing:.1em;text-transform:uppercase;color:var(--muted)}
.arc3d .hud small b{color:var(--ink)}
.arc3d .hud-e{display:flex;align-items:baseline;gap:.4rem;margin:.25rem 0 .5rem}
.arc3d .hud-e strong{font:800 2.6rem/1 var(--display);letter-spacing:-.03em;font-variant-numeric:tabular-nums;transition:color .3s}
.arc3d .hud-e span{font:700 .9rem var(--display);color:var(--muted)}
.arc3d .hud-e.na strong{font-size:1.5rem} .arc3d .hud-e.na span{display:none}
.arc3d .gauge{position:relative;height:8px;border-radius:6px;background:linear-gradient(90deg,#a8306a,#e5394d 30%,#ff7a59 52%,#ffb347 72%,#fff1d6);transition:opacity .3s}
.arc3d .gauge.off{opacity:.2}
.arc3d .gauge i{position:absolute;top:50%;width:14px;height:14px;border-radius:50%;background:#fff;border:3px solid #061426;transform:translate(-50%,-50%);box-shadow:0 0 0 2px #fff;transition:left .15s}
.arc3d .gauge-l{display:flex;justify-content:space-between;font:700 .62rem var(--display);color:var(--dim);margin-top:4px}
.arc3d .hud p{margin:.6rem 0 0;font-size:.82rem;line-height:1.5;color:#cfdbe3}
.arc3d .i{color:var(--coral)} .arc3d .n{color:var(--gold)}
.arc3d .probe{position:absolute;left:0;top:0;pointer-events:none;min-width:170px;padding:10px 12px;border-radius:12px;background:rgba(6,20,38,.92);border:1px solid rgba(255,255,255,.18);opacity:0;transition:opacity .15s;display:flex;flex-direction:column;gap:2px;font-size:.78rem;color:var(--muted)}
.arc3d .probe.on{opacity:1}
.arc3d .probe small{font:700 .64rem var(--display);letter-spacing:.08em;text-transform:uppercase}
.arc3d .probe strong{font:800 1.5rem/1.1 var(--display);font-variant-numeric:tabular-nums}
.arc3d .probe strong em{font-style:normal;font-size:.8rem;color:var(--muted)}
.arc3d .story{position:absolute;left:16px;bottom:16px;width:min(430px,calc(100% - 32px));border:1px solid var(--line);border-radius:var(--r);background:rgba(6,20,38,.88);padding:16px 18px;backdrop-filter:blur(6px)}
.arc3d .story small{font:700 .66rem/1 var(--display);letter-spacing:.14em;text-transform:uppercase;color:var(--gold)}
.arc3d .story h3{font:800 1.35rem/1.2 var(--display);margin:.35rem 0 .3rem;letter-spacing:-.02em;color:var(--ink)}
.arc3d .story p{margin:0;color:#cfdbe3;font-size:.92rem}
.arc3d .story .nav{display:flex;flex-wrap:wrap;gap:8px;margin-top:12px}
.arc3d .story .nav button{font:700 .8rem var(--body);border:1px solid var(--line);background:transparent;color:var(--ink);border-radius:999px;padding:.55rem .95rem;cursor:pointer}
.arc3d .story .nav button.primary{background:var(--gold);color:#061426;border-color:var(--gold)}
.arc3d .flash{position:absolute;inset:0;background:radial-gradient(circle at 46% 42%,#fff,rgba(220,235,255,.85) 25%,rgba(255,150,90,0) 70%);opacity:0;pointer-events:none}
.arc3d .lbl{position:absolute;right:16px;top:58px;width:min(470px,52%);height:auto;border-radius:14px;box-shadow:0 20px 50px rgba(0,0,0,.55);transform:translateX(130%);transition:transform .8s cubic-bezier(.2,.8,.2,1)}
.arc3d .lbl.on{transform:none}
.arc3d .bands{display:flex;flex-wrap:wrap;gap:8px 16px;align-items:center;margin-top:14px;font-size:.78rem;color:var(--muted)}
.arc3d .bl-t{font:700 .66rem var(--display);letter-spacing:.12em;text-transform:uppercase;color:var(--ink);margin-right:4px}
.arc3d .bl i{display:inline-block;width:14px;height:14px;border-radius:4px;vertical-align:-2px;margin-right:6px}
.arc3d .bl i.hatch{background:repeating-linear-gradient(45deg,rgba(229,184,102,.7) 0 3px,rgba(229,184,102,.15) 3px 7px);border:1px solid var(--gold)}
.arc3d .readouts{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:12px;margin-top:16px}
.arc3d .ro{border:1px solid var(--line);border-radius:var(--r);padding:14px 16px;background:rgba(13,42,71,.55);transition:opacity .3s}
.arc3d .ro small{display:block;font-size:.7rem;letter-spacing:.12em;text-transform:uppercase;color:var(--muted);font-family:var(--display)}
.arc3d .ro strong{display:block;font-family:var(--display);font-size:1.9rem;line-height:1.15;letter-spacing:-.02em;font-variant-numeric:tabular-nums}
.arc3d .ro span{font-size:.85rem;color:var(--muted)}
.arc3d .ro.nfpa strong{color:var(--gold)} .arc3d .ro.ieee strong{color:var(--coral)} .arc3d .ro.shock strong{color:var(--teal)}
.arc3d .ro.off{opacity:.35}
.arc3d .note{margin-top:16px;border-left:3px solid var(--gold);background:rgba(229,184,102,.07);padding:12px 16px;border-radius:0 var(--r) var(--r) 0;color:#d9e5ec;font-size:.9rem}
.arc3d .note b{color:var(--gold)}
.arc3d .fine{color:var(--dim);font-size:.78rem;margin:12px 0 0}
/* Bloques del texto de la publicación (tema claro del sitio) */
.arc-sec{padding-block:56px}
.arc-pub{max-width:880px;margin-inline:auto}
.arc-pub h1{font-size:clamp(2.1rem,4.4vw,3.5rem);margin:.6rem 0 1.2rem;max-width:22ch}
.arc-pub h2{font-size:clamp(1.5rem,2.8vw,2.2rem)}
.arc-pub p{font-size:1.08rem}
.arc-pub .arc-lead{font-size:1.25rem;font-weight:700;line-height:1.5}
.arc-pub blockquote{margin:1.6rem 0;padding:1rem 1.25rem;border-left:4px solid #dfb54a;background:rgba(223,181,74,.12);border-radius:0 14px 14px 0;font:800 1.2rem/1.4 "Sora",system-ui,sans-serif}
.arc-pub .arc-list{list-style:none;padding:0;margin:0 0 1.2rem;display:grid;gap:10px}
.arc-pub .arc-list li{border:1px solid rgba(15,65,111,.15);border-radius:14px;padding:14px 16px;background:rgba(15,65,111,.04)}
.arc-pub .arc-list b{color:#0f416f}
.arc-pub h2{margin-top:2.4rem}
@media (max-width:700px){
  .arc3d .hud{position:static;width:auto;margin:10px;padding:10px 12px}
  .arc3d .hud.off{display:none}
  .arc3d .story{position:static;width:auto;margin:10px;padding:12px 14px}
  .arc3d .story h3{font-size:1.1rem}
  .arc3d .lbl{position:static;width:calc(100% - 20px);margin:10px;transform:none;display:none}
  .arc3d .lbl.on{display:block}
  .arc3d .ro strong{font-size:1.5rem}
}
@media (prefers-reduced-motion:reduce){.arc3d *{transition:none!important;animation:none!important}}

/* Compact controls and a single live reading. */
.arc3d{--gold:#c6bd9e;--coral:#d7a58e;--teal:#9ab4b8;background:#101e29}
.arc3d .steps{gap:4px;padding:5px;background:#192a35;border-radius:12px}
.arc3d .steps button{border:0;border-radius:8px;flex:1;line-height:1.25}
.arc3d .hud{position:relative;top:auto;left:auto;width:auto;margin:10px 16px;display:grid;grid-template-columns:minmax(160px,1fr) 1fr;align-items:center;gap:4px 18px;pointer-events:auto;background:#1b2d38}
.arc3d .hud label{grid-row:span 3;font-weight:700;font-size:.83rem}.arc3d .hud input{display:block;width:100%;accent-color:#c6bd9e;margin:12px 0}
.arc3d .hud-e strong{font-size:1.7rem}.arc3d .gauge,.arc3d .gauge-l,.arc3d .readouts,.arc3d .bands,.arc3d .note{display:none}
.arc3d .lbl{cursor:pointer}.arc3d input:focus-visible,.arc3d .lbl:focus-visible{outline:3px solid #fff;outline-offset:3px}
@media(max-width:700px){.arc3d .hud{grid-template-columns:1fr 1fr;margin:10px}.arc3d .steps button{flex:1 1 30%;padding:.6rem .4rem}.arc3d .gl{height:360px}}

.arc3d .story{position:static;width:auto;margin:10px 16px}.arc3d .hud{margin-top:10px}

/* Publication column: centered text; figures may use more width. */
.arc-sec .arc-pub figure{margin:2rem 0}
@media(min-width:1000px){.arc-sec .arc-pub figure{width:min(1120px,calc(100vw - 96px));margin-left:50%;transform:translateX(-50%)}}
.arc-pub figure img{display:block;width:100%;height:auto;aspect-ratio:1600/600;object-fit:cover;border-radius:12px}
.arc-pub figcaption{margin-top:.6rem;font-size:.92rem;color:#52677a;text-align:center}
.arc3d .nav button[aria-pressed="true"]{background:var(--gold);border-color:var(--gold);color:#061426}
html{scrollbar-gutter:auto!important}

/* Sweep toggle lives in the model toolbar (always visible, desktop and mobile). */
.arc3d .head-tools{display:flex;align-items:center;gap:10px}
.arc3d .sweep-btn{display:inline-flex;align-items:center;gap:6px;font:700 .82rem var(--body);color:#061426;background:var(--gold);border:1px solid var(--gold);border-radius:999px;padding:.4rem .95rem;cursor:pointer;white-space:nowrap}
.arc3d .sweep-btn[aria-pressed="true"]{background:transparent;color:var(--ink);border-color:var(--gold)}
.arc3d .sweep-btn:focus-visible{outline:3px solid #fff;outline-offset:2px}
@media(max-width:700px){.arc3d .sweep-btn{padding:.35rem .7rem;font-size:.75rem}}