:root {
  --paper: #f6f5f0;
  --card: #ffffff;
  --ink: #14181b;
  --muted: #5b646b;
  --line: #e1dfd6;
  --volt: #ffd60a;
  --volt-ink: #4a3c00;
  --link: #0b5c4a;
  --dark: #11161a;
  --dark-2: #1b2227;
  --on-dark: #f3f1e8;
  --radius: 14px;
  --shadow: 0 1px 2px rgba(20, 24, 27, .06), 0 8px 24px rgba(20, 24, 27, .06);
  --font: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}
@media (prefers-color-scheme: dark) {
  :root {
    --paper: #0f1316;
    --card: #181e22;
    --ink: #eeece3;
    --muted: #a2abb1;
    --line: #2a3238;
    --link: #7fe0c4;
    --volt-ink: #ffe66b;
    --dark: #0a0d0f;
    --dark-2: #161c20;
    --shadow: none;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body { margin: 0; background: var(--paper); color: var(--ink); font: 17px/1.6 var(--font); }
h1, h2, h3 { line-height: 1.15; letter-spacing: -.02em; text-wrap: balance; margin: 0 0 .5em; }
h1 { font-size: clamp(2rem, 5vw, 3.1rem); font-weight: 800; }
h2 { font-size: clamp(1.35rem, 3vw, 1.75rem); font-weight: 750; margin-top: 0; }
h3 { font-size: 1.1rem; margin-top: 1.4em; }
p { margin: 0 0 1em; }
a { color: var(--link); text-underline-offset: 3px; }
a:hover { text-decoration-thickness: 2px; }
ul { padding-left: 1.2em; margin: 0 0 1em; }
li { margin-bottom: .45em; }
strong { font-weight: 700; }
.wrap { max-width: 1080px; margin: 0 auto; padding: 0 16px; }
.narrow { max-width: 760px; }
.skip { position: absolute; left: -999px; top: 0; background: var(--volt); color: #111; padding: 8px 12px; z-index: 10; }
.skip:focus { left: 8px; top: 8px; }
:focus-visible { outline: 3px solid var(--volt); outline-offset: 2px; }

/* header / footer */
.site-head { background: var(--dark); color: var(--on-dark); }
.head-in { display: flex; align-items: center; justify-content: space-between; gap: 12px; min-height: 58px; flex-wrap: wrap; }
.logo { display: inline-flex; align-items: center; gap: 8px; color: var(--on-dark); text-decoration: none; font-weight: 800; font-size: 1.15rem; letter-spacing: -.02em; }
.logo svg { color: var(--volt); }
.site-head nav { display: flex; gap: 4px; flex-wrap: wrap; }
.site-head nav a { color: var(--on-dark); text-decoration: none; padding: 8px 10px; border-radius: 8px; font-size: .95rem; opacity: .85; }
.site-head nav a:hover { opacity: 1; background: var(--dark-2); }
.site-foot { background: var(--dark); color: var(--on-dark); margin-top: 64px; padding: 36px 0 20px; font-size: .92rem; }
.foot-in { display: grid; grid-template-columns: 1.4fr 1fr; gap: 32px; }
.foot-in p { opacity: .75; max-width: 46ch; }
.foot-brand { font-weight: 800; font-size: 1.1rem; opacity: 1 !important; }
.site-foot nav { display: grid; gap: 6px; align-content: start; }
.site-foot a { color: var(--on-dark); opacity: .85; }
.foot-copy { opacity: .5; margin-top: 24px; }

/* hero */
.hero { background: var(--dark); color: var(--on-dark); padding: 40px 0 56px; }
.hero-in { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: center; }
.hero h1 { color: #fff; }
.hero .lead { font-size: 1.12rem; opacity: .82; max-width: 44ch; }
.eyebrow { font-size: .8rem; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; color: var(--volt-ink); margin-bottom: .8em; }
.eyebrow a { color: inherit; text-decoration: none; }
.hero .eyebrow { color: var(--volt); }
.hero-links { display: flex; gap: 18px; align-items: center; flex-wrap: wrap; margin-top: 1.4em; }
.hero .link { color: var(--on-dark); }
.btn { display: inline-block; background: var(--volt); color: #171200; font-weight: 700; text-decoration: none; padding: 11px 18px; border-radius: 10px; }
.btn:hover { filter: brightness(1.06); }
.hero-calc { background: var(--card); color: var(--ink); border-radius: 18px; padding: 22px; box-shadow: 0 20px 60px rgba(0, 0, 0, .35); }
.hero-calc h2 { font-size: 1.15rem; margin-bottom: .8em; }

/* page */
.block { margin-top: 56px; }
.page { padding-top: 8px; }
.page > section, .page > aside { margin-top: 44px; }
.page-head { max-width: 780px; padding-top: 18px; }
.answer { font-size: 1.2rem; line-height: 1.5; }
.meta, .note { color: var(--muted); font-size: .88rem; }
.crumbs { padding-top: 14px; font-size: .85rem; color: var(--muted); }
.crumbs ol { list-style: none; display: flex; flex-wrap: wrap; gap: 4px 0; padding: 0; margin: 0; }
.crumbs li { margin: 0; }
.crumbs li + li::before { content: "/"; margin: 0 8px; opacity: .5; }
.crumbs a { color: var(--muted); }
.prose { max-width: 760px; }
.prose h2 { margin-top: 1.8em; }
.formula { background: var(--card); border: 1px solid var(--line); border-left: 5px solid var(--volt); border-radius: 10px; padding: 14px 16px; font-variant-numeric: tabular-nums; }

/* calculator */
.calc-box { background: var(--card); border: 1px solid var(--line); border-radius: 18px; padding: 22px; box-shadow: var(--shadow); max-width: 780px; }
.calc-fields { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 12px; }
.calc label { display: grid; gap: 5px; font-size: .82rem; font-weight: 600; color: var(--muted); }
.calc input, .calc select, .filter input { font: inherit; font-size: 1.05rem; font-weight: 600; color: var(--ink); background: var(--paper); border: 1.5px solid var(--line); border-radius: 10px; padding: 10px 12px; width: 100%; min-width: 0; }
.calc input:focus, .calc select:focus, .filter input:focus { border-color: var(--ink); outline: none; }
.calc-select { margin-bottom: 12px; }
.calc[data-modo="potencia"] [data-for="ciclo"], .calc[data-modo="ciclo"] [data-for="potencia"] { display: none; }
.calc-out { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; margin-top: 16px; }
.calc-out > div { background: var(--paper); border-radius: 12px; padding: 12px; display: grid; gap: 2px; align-content: start; }
.calc-out span { font-size: .74rem; font-weight: 700; text-transform: uppercase; letter-spacing: .05em; color: var(--muted); }
.calc-out strong { font-size: 1.25rem; font-variant-numeric: tabular-nums; letter-spacing: -.01em; }
.calc-out small { color: var(--muted); font-size: .8rem; font-variant-numeric: tabular-nums; }
.calc-out .big { background: var(--volt); color: #171200; }
.calc-out .big span, .calc-out .big small { color: #4a3c00; }

/* tables */
.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: var(--radius); background: var(--card); }
table { border-collapse: collapse; width: 100%; font-size: .95rem; font-variant-numeric: tabular-nums; }
th, td { padding: 11px 14px; text-align: right; white-space: nowrap; border-bottom: 1px solid var(--line); }
th:first-child, td:first-child, .rank th { text-align: left; }
thead th { font-size: .76rem; text-transform: uppercase; letter-spacing: .05em; color: var(--muted); background: var(--paper); }
tbody tr:last-child th, tbody tr:last-child td { border-bottom: 0; }
tbody th { font-weight: 600; }
.rank .pos { color: var(--muted); width: 1%; }

/* cards & tiles */
.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 12px; }
.card { display: grid; gap: 3px; background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 14px 16px; text-decoration: none; color: var(--ink); transition: transform .12s, border-color .12s; }
.card:hover, .tile:hover { transform: translateY(-2px); border-color: var(--ink); }
.card-t { font-weight: 700; }
.card-n { font-size: 1.1rem; font-weight: 800; font-variant-numeric: tabular-nums; }
.card-s { font-size: .8rem; color: var(--muted); }
.tiles { display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 14px; }
.tile { display: grid; gap: 6px; align-content: start; background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 18px; text-decoration: none; color: var(--ink); transition: transform .12s, border-color .12s; }
.tile-t { font-weight: 750; font-size: 1.08rem; line-height: 1.25; }
.tile-s { color: var(--muted); font-size: .92rem; }
.tile-n { color: var(--link); font-weight: 700; font-size: .9rem; margin-top: 4px; }
.cat-block { margin-top: 36px; }
.cat-block h2 a { color: inherit; text-decoration: none; }
.filter { max-width: 420px; display: grid; gap: 6px; margin-top: 24px; }
.filter label { font-size: .82rem; font-weight: 600; color: var(--muted); }
[hidden] { display: none !important; }

/* faq & shop */
.faq { border-top: 1px solid var(--line); padding: 16px 0 4px; }
.faq h3 { margin-top: 0; }
.shop { background: var(--card); border: 1px dashed var(--line); border-radius: var(--radius); padding: 20px; max-width: 780px; }
.shop-links { display: flex; gap: 10px; flex-wrap: wrap; }
.shop-links a { background: var(--dark); color: var(--on-dark); text-decoration: none; padding: 10px 14px; border-radius: 10px; font-weight: 600; font-size: .95rem; }
.link { font-weight: 700; }

@media (max-width: 820px) {
  .hero-in { grid-template-columns: 1fr; gap: 28px; }
  .hero { padding: 28px 0 40px; }
  .foot-in { grid-template-columns: 1fr; }
  .calc-out { grid-template-columns: repeat(2, 1fr); }
  .block { margin-top: 44px; }
}
@media (prefers-reduced-motion: reduce) { * { transition: none !important; scroll-behavior: auto !important; } }