:root{
  --bg:#070b14;--bg2:#0d1424;--card:rgba(255,255,255,.05);--card-brd:rgba(255,255,255,.10);
  --ink:#eaf1fb;--ink-soft:#9fb2cc;--accent:#38bdf8;--accent2:#6366f1;--verde:#34d399;--amar:#fbbf24;
  --rojo:#f87171;--wa:#25d366;--rad:18px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:'Inter','Segoe UI',Roboto,Helvetica,Arial,sans-serif;color:var(--ink);background:var(--bg);line-height:1.55;-webkit-font-smoothing:antialiased;overflow-x:hidden}
body::before{content:"";position:fixed;inset:0;z-index:-2;background:
  radial-gradient(60% 50% at 15% 0%,rgba(99,102,241,.30),transparent 60%),
  radial-gradient(55% 45% at 90% 10%,rgba(56,189,248,.25),transparent 60%),
  radial-gradient(60% 60% at 50% 110%,rgba(52,211,153,.16),transparent 60%),var(--bg)}
.wrap{max-width:860px;margin:0 auto;padding:0 16px}

/* header */
header{position:sticky;top:0;z-index:40;backdrop-filter:blur(12px);background:rgba(7,11,20,.6);border-bottom:1px solid var(--card-brd)}
header .wrap{display:flex;align-items:center;justify-content:space-between;padding:12px 16px}
.logo{font-weight:800;font-size:1.05rem;display:flex;align-items:center;gap:8px;letter-spacing:-.02em;text-decoration:none;color:var(--ink)}
.logo .dot{width:9px;height:9px;border-radius:50%;background:var(--accent);box-shadow:0 0 14px var(--accent)}
.logo span{color:var(--accent)}
.lang{display:flex;gap:2px;background:rgba(255,255,255,.07);border:1px solid var(--card-brd);border-radius:30px;padding:3px}
.lang button{background:transparent;border:0;color:var(--ink-soft);padding:5px 13px;border-radius:30px;cursor:pointer;font-weight:600;font-size:.82rem}
.lang button.on{background:linear-gradient(135deg,var(--accent),var(--accent2));color:#04101f}

/* hero */
.hero{text-align:center;padding:42px 0 14px}
.pill{display:inline-flex;align-items:center;gap:7px;font-size:.78rem;font-weight:600;color:var(--accent);background:rgba(56,189,248,.10);border:1px solid rgba(56,189,248,.30);padding:6px 14px;border-radius:30px;margin-bottom:18px}
.hero h1{font-size:2.05rem;font-weight:800;line-height:1.15;letter-spacing:-.03em;margin-bottom:12px}
.hero h1 .grad{background:linear-gradient(120deg,var(--accent),var(--accent2) 60%,var(--verde));-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.hero p{color:var(--ink-soft);font-size:1.04rem;max-width:560px;margin:0 auto}
.crosslink{display:inline-block;margin-top:16px;font-size:.88rem;font-weight:600;color:var(--accent);text-decoration:none;border:1px solid rgba(56,189,248,.3);background:rgba(56,189,248,.08);padding:8px 16px;border-radius:30px;transition:.16s}
.crosslink:hover{background:rgba(56,189,248,.16);transform:translateY(-1px)}

/* panel */
.panel{background:var(--card);border:1px solid var(--card-brd);border-radius:var(--rad);backdrop-filter:blur(16px);box-shadow:0 24px 60px -20px rgba(0,0,0,.6);padding:24px;margin-top:18px}
.sec-head{display:flex;align-items:center;gap:9px;font-weight:700;font-size:1.05rem;margin-bottom:16px;flex-wrap:wrap}
.sec-head.mt{margin-top:26px;padding-top:24px;border-top:1px solid var(--card-brd)}
.sec-head .n{flex:none;width:26px;height:26px;border-radius:50%;background:linear-gradient(135deg,var(--accent),var(--accent2));color:#04101f;font-size:.85rem;font-weight:800;display:grid;place-items:center}
.recibo{font-size:.74rem;font-weight:600;color:var(--ink-soft);background:rgba(255,255,255,.06);border:1px solid var(--card-brd);padding:3px 10px;border-radius:20px}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.step{display:flex;flex-direction:column}
.step.span2{grid-column:1/-1}
.lab{font-weight:600;font-size:.86rem;color:var(--ink-soft);margin-bottom:7px}
select{width:100%;padding:13px 14px;border:1px solid var(--card-brd);border-radius:12px;font-size:.98rem;background:rgba(255,255,255,.04);color:var(--ink);transition:.18s}
select:focus{outline:0;border-color:var(--accent);box-shadow:0 0 0 3px rgba(56,189,248,.18)}
select option,optgroup{background:#0d1424;color:var(--ink)}
.hint{font-size:.76rem;color:var(--ink-soft);margin-top:6px;line-height:1.4}

.go{margin-top:22px;width:100%;border:0;border-radius:14px;padding:16px;font-size:1.06rem;font-weight:800;color:#04101f;cursor:pointer;
    background:linear-gradient(120deg,var(--accent),var(--accent2));box-shadow:0 14px 34px -10px rgba(56,189,248,.6);transition:.18s;letter-spacing:-.01em}
.go:hover{transform:translateY(-2px);box-shadow:0 18px 40px -10px rgba(56,189,248,.7)}

/* results */
#res{margin-top:24px;display:none}
#res.show{display:block}
.reveal{opacity:0;transform:translateY(14px);animation:rise .55s cubic-bezier(.2,.7,.3,1) forwards}
@keyframes rise{to{opacity:1;transform:none}}
.res-title{font-weight:800;font-size:1.22rem;letter-spacing:-.02em;margin-bottom:16px;text-align:center}

.warn{display:none;background:rgba(248,113,113,.10);border:1px solid rgba(248,113,113,.4);border-radius:14px;padding:14px 16px;margin-bottom:18px;font-size:.88rem;color:#fecaca;line-height:1.5}
.warn.show{display:block}
.warn strong{color:#fca5a5}

.kwh-row{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-bottom:18px}
.kwh-card{text-align:center;padding:18px;border-radius:14px;background:linear-gradient(135deg,rgba(52,211,153,.14),rgba(56,189,248,.08));border:1px solid rgba(52,211,153,.28)}
.kwh-lbl{font-size:.78rem;text-transform:uppercase;letter-spacing:.1em;color:var(--ink-soft);font-weight:700}
.kwh-val{font-size:2.1rem;font-weight:800;line-height:1;margin-top:6px;letter-spacing:-.03em}
.kwh-val .u{font-size:1rem;font-weight:700;color:var(--ink-soft)}

.period-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.period{border:1px solid var(--card-brd);border-radius:14px;background:rgba(255,255,255,.03);padding:16px;display:flex;flex-direction:column}
.p-head{font-weight:800;font-size:1rem;margin-bottom:12px;letter-spacing:-.01em}
.tbl{width:100%;border-collapse:collapse;font-size:.82rem}
.tbl th{text-align:left;font-size:.68rem;text-transform:uppercase;letter-spacing:.06em;color:var(--ink-soft);font-weight:700;padding:0 0 8px;border-bottom:1px solid var(--card-brd)}
.tbl th.r,.tbl td.r{text-align:right}
.tbl td{padding:8px 0;border-bottom:1px solid rgba(255,255,255,.05)}
.tbl tr:last-child td{border-bottom:0}
.badge{display:inline-block;width:9px;height:9px;border-radius:2px;margin-right:7px;vertical-align:middle}
.eb-basico{background:var(--verde)}.eb-intermedio{background:var(--amar)}.eb-excedente{background:var(--rojo)}.eb-flat{background:var(--accent)}
.p-total{margin-top:auto;padding-top:14px;display:flex;flex-direction:column;align-items:flex-start}
.p-total b{font-size:1.5rem;font-weight:800;letter-spacing:-.03em;color:var(--ink);margin:2px 0}
.p-total .iva{font-size:.72rem;color:var(--ink-soft)}

.note{font-size:.82rem;color:var(--ink-soft);margin-top:16px;line-height:1.55;background:rgba(251,191,36,.07);border:1px solid rgba(251,191,36,.25);border-radius:12px;padding:12px 14px}
.note strong{color:var(--amar)}
.disc{font-size:.74rem;color:var(--ink-soft);margin-top:12px;line-height:1.5}

/* article */
.article{margin-top:26px;padding:4px 2px 0}
.article h2{font-size:1.3rem;font-weight:800;letter-spacing:-.02em;margin:26px 0 10px}
.article p{color:var(--ink-soft);font-size:.96rem;margin-bottom:6px}
.article b{color:var(--ink)}
.tip{margin-top:24px;border:1px solid rgba(56,189,248,.3);background:rgba(56,189,248,.07);border-radius:16px;padding:18px 20px}
.tip strong{color:var(--accent);font-size:1rem}
.tip p{margin:8px 0}
.tip ul{margin:6px 0 0 18px}
.tip li{color:var(--ink-soft);margin:4px 0}


footer{text-align:center;color:var(--ink-soft);font-size:.8rem;padding:34px 16px 90px}

@media(max-width:640px){
  .hero h1{font-size:1.65rem}
  .grid2{grid-template-columns:1fr}
  .period-grid{grid-template-columns:1fr}
  .kwh-val{font-size:1.8rem}
}

.headRight{display:flex;align-items:center;gap:8px}
.hnav{display:flex;gap:6px}
.hnav a{font-size:.82rem;font-weight:600;color:var(--ink-soft);text-decoration:none;border:1px solid var(--card-brd);background:rgba(255,255,255,.06);padding:6px 12px;border-radius:30px;transition:.16s}
.hnav a:hover{color:var(--accent);border-color:rgba(56,189,248,.35)}
.hnav a.on{color:var(--accent);border-color:rgba(56,189,248,.5);background:rgba(56,189,248,.12)}
.langToggle{border:1px solid var(--card-brd);background:rgba(255,255,255,.06);color:var(--ink);border-radius:30px;padding:6px 12px;font-size:.82rem;font-weight:800;cursor:pointer}
.langToggle:hover{border-color:rgba(56,189,248,.4);color:var(--accent)}
@media(max-width:640px){.hnav{gap:4px}.hnav a{padding:5px 9px;font-size:.74rem}}

.foot-links{display:flex;gap:14px;justify-content:center;flex-wrap:wrap;margin-bottom:10px}.foot-links a{color:var(--ink-soft);text-decoration:none;font-weight:600}.foot-links a:hover{color:var(--accent)}