:root{
  --fondo:#f4fbf9; --blanco:#fff; --texto:#0f2e2b; --suave:#557370; --borde:#d4e8e4;
  --menta:#14b8a6; --menta-osc:#0d8a7c; --menta-cl:#dff6f2; --profundo:#0b3b37; --ambar:#f59e0b;
  --ok:#16a34a; --mal:#dc2626; --radio:18px; --max:1120px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:"Manrope",system-ui,-apple-system,Segoe UI,Roboto,sans-serif;color:var(--texto);background:var(--fondo);line-height:1.7;font-size:17px}
svg{max-width:100%;display:block}
a{color:var(--menta-osc)}
h1,h2,h3{font-family:"Outfit",system-ui,sans-serif;line-height:1.15;color:var(--profundo)}
h1{font-size:clamp(2.2rem,5.4vw,3.7rem);font-weight:700;letter-spacing:-.02em}
h2{font-size:clamp(1.7rem,3.6vw,2.5rem);font-weight:700;letter-spacing:-.01em;margin-bottom:.5rem}
h3{font-size:1.12rem;font-weight:600;margin-bottom:.3rem}
p+p{margin-top:.8rem}
.wrap{max-width:var(--max);margin:0 auto;padding:0 20px}
.eyebrow{display:inline-flex;align-items:center;gap:8px;font-family:"Outfit",sans-serif;font-size:.8rem;font-weight:600;letter-spacing:.12em;text-transform:uppercase;color:var(--menta-osc);margin-bottom:10px}
.eyebrow::before{content:"";width:18px;height:2px;background:var(--menta)}
.intro{max-width:700px;color:var(--suave);margin-bottom:34px}
section[id]{scroll-margin-top:74px}

.aviso-top{background:var(--profundo);color:#bdeee6;text-align:center;font-size:.86rem;padding:8px 16px}

header.site{position:sticky;top:0;z-index:20;background:rgba(244,251,249,.85);backdrop-filter:blur(12px);border-bottom:1px solid var(--borde)}
header.site .wrap{display:flex;align-items:center;justify-content:space-between;gap:16px;min-height:68px}
.logo{display:flex;align-items:center;gap:10px;font-family:"Outfit",sans-serif;font-weight:700;font-size:1.3rem;color:var(--profundo);text-decoration:none}
.logo svg{width:34px;height:34px}
nav.menu{display:flex;gap:4px}
nav.menu a{text-decoration:none;color:var(--suave);font-weight:600;font-size:.9rem;padding:6px 12px;border-radius:10px;transition:all .2s}
nav.menu a:hover,nav.menu a.activo{background:var(--menta-cl);color:var(--profundo)}
.progreso{position:absolute;left:0;bottom:-1px;height:3px;width:0;background:linear-gradient(90deg,var(--menta),#38bdf8)}

/* HERO */
.hero{position:relative;overflow:hidden;padding:76px 0 84px;background:radial-gradient(circle at 85% 20%,#c8f1ea 0%,transparent 45%),radial-gradient(circle at 10% 90%,#d9f2fb 0%,transparent 40%)}
.hero .wrap{display:grid;grid-template-columns:1.1fr .9fr;gap:40px;align-items:center}
.hero p.lead{color:var(--suave);font-size:1.15rem;margin:20px 0 30px;max-width:560px}
.hero h1 em{font-style:normal;background:linear-gradient(90deg,var(--menta-osc),#0ea5e9);-webkit-background-clip:text;background-clip:text;color:transparent}
.btn{display:inline-block;background:var(--profundo);color:#fff;font-weight:700;text-decoration:none;padding:14px 26px;border-radius:12px;transition:transform .2s,box-shadow .2s}
.btn:hover{transform:translateY(-2px);box-shadow:0 12px 26px rgba(11,59,55,.25)}
.btn.sec{background:#fff;color:var(--profundo);border:1px solid var(--borde);margin-left:8px}
.chips{display:flex;gap:10px;flex-wrap:wrap;margin-top:26px}
.chip{background:#fff;border:1px solid var(--borde);border-radius:999px;padding:6px 14px;font-size:.85rem;color:var(--suave);font-weight:600}

/* Animación del filtro */
.filtro-ilu{background:rgba(255,255,255,.7);border:1px solid var(--borde);border-radius:28px;padding:22px;box-shadow:0 30px 60px rgba(11,59,55,.08)}
.filtro-ilu svg{width:100%;height:auto}
.gota-cae{animation:cae 2.4s linear infinite}
@keyframes cae{0%{transform:translateY(0);opacity:0}10%{opacity:1}100%{transform:translateY(300px);opacity:1}}
.particula{animation:atrapada 2.4s ease-in infinite}
@keyframes atrapada{0%{transform:translateY(-40px);opacity:0}20%{opacity:1}60%,100%{transform:translateY(0);opacity:1}}
.nivel-agua{animation:sube 7s ease-in-out infinite alternate}
@keyframes sube{from{transform:translateY(14px)}to{transform:translateY(0)}}

/* Contadores */
.datos{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.dato{background:#fff;border:1px solid var(--borde);border-radius:var(--radio);padding:24px}
.dato .num{font-family:"Outfit",sans-serif;font-weight:700;font-size:2.3rem;color:var(--menta-osc);line-height:1}
.dato p{color:var(--suave);font-size:.94rem;margin-top:8px}
.fuente{font-size:.78rem;color:var(--suave);margin-top:14px;font-style:italic}

section.bloque{padding:84px 0}
section.alt{background:#fff;border-top:1px solid var(--borde);border-bottom:1px solid var(--borde)}

/* Por qué */
.porque{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.card{background:#fff;border:1px solid var(--borde);border-radius:var(--radio);padding:24px;transition:transform .25s,box-shadow .25s}
.card:hover{transform:translateY(-4px);box-shadow:0 16px 32px rgba(11,59,55,.08)}
section.alt .card{background:var(--fondo)}
.card .ico{width:46px;height:46px;border-radius:14px;background:var(--menta-cl);color:var(--menta-osc);display:grid;place-items:center;margin-bottom:14px}
.card .ico svg{width:24px;height:24px}
.card p{color:var(--suave);font-size:.95rem}

/* Selector de filtro */
.selector{display:grid;grid-template-columns:1fr 1fr;gap:28px;align-items:start}
.opciones-sel{display:grid;gap:10px}
.opt{display:flex;gap:14px;align-items:center;text-align:left;background:#fff;border:1.5px solid var(--borde);border-radius:14px;padding:16px 18px;cursor:pointer;font:600 .98rem "Manrope",system-ui,sans-serif;color:var(--texto);transition:all .2s}
.opt:hover{border-color:var(--menta)}
.opt[aria-pressed="true"]{border-color:var(--menta);background:var(--menta-cl)}
.opt .em{flex:0 0 38px;height:38px;border-radius:10px;background:var(--fondo);display:grid;place-items:center;font-size:1.2rem}
.resultado{background:var(--profundo);color:#e6faf6;border-radius:var(--radio);padding:28px;position:sticky;top:90px;min-height:280px}
.resultado h3{color:#fff;font-size:1.3rem}
.resultado .tag{display:inline-block;background:rgba(20,184,166,.2);color:#7ee8d8;border-radius:999px;padding:4px 12px;font-size:.8rem;font-weight:700;margin:4px 6px 0 0}
.resultado p{color:#b9dcd6;margin-top:12px}
.resultado .ojo{margin-top:16px;background:rgba(255,255,255,.07);border-radius:12px;padding:12px 14px;font-size:.92rem;color:#d7f3ee}
.resultado .vacio{color:#9cc9c2}
.anim-in{animation:entra .45s ease}
@keyframes entra{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}

/* Tabla comparativa */
.tabla-wrap{overflow-x:auto;background:#fff;border:1px solid var(--borde);border-radius:var(--radio)}
table{width:100%;border-collapse:collapse;min-width:760px;font-size:.93rem}
th,td{padding:14px 16px;text-align:center;border-bottom:1px solid var(--borde)}
th{background:var(--menta-cl);color:var(--profundo);font-family:"Outfit",sans-serif;font-weight:600}
td:first-child,th:first-child{text-align:left}
td:first-child strong{display:block}
td:first-child small{color:var(--suave)}
tr:last-child td{border-bottom:0}
tbody tr{transition:background .2s}
tbody tr:hover{background:#f7fdfc}
.si{color:var(--ok);font-weight:800}
.par{color:var(--ambar);font-weight:800}
.no{color:#b4c4c2;font-weight:800}
.leyenda-t{display:flex;gap:18px;flex-wrap:wrap;margin-top:12px;font-size:.86rem;color:var(--suave)}

/* Certificaciones */
.certs{display:grid;grid-template-columns:repeat(5,1fr);gap:12px}
.cert{background:#fff;border:1px solid var(--borde);border-radius:14px;padding:18px;text-align:center}
.cert b{display:block;font-family:"Outfit";font-size:1.5rem;color:var(--menta-osc)}
.cert span{font-size:.86rem;color:var(--suave)}

/* IRCA */
.irca{display:grid;grid-template-columns:1fr 1fr;gap:36px;align-items:center}
.medidor{background:#fff;border:1px solid var(--borde);border-radius:var(--radio);padding:26px}
.barra-irca{display:flex;height:18px;border-radius:999px;overflow:hidden;margin:16px 0 8px}
.barra-irca span{display:block;height:100%}
.slider-irca{width:100%;accent-color:var(--profundo);margin-top:14px}
.irca-res{margin-top:16px;padding:16px;border-radius:12px;background:var(--fondo);border-left:4px solid var(--menta)}
.irca-res strong{font-family:"Outfit";font-size:1.1rem}
.escala{display:flex;justify-content:space-between;font-size:.75rem;color:var(--suave)}

/* Mantenimiento */
.pasos{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;counter-reset:p}
.paso{background:#fff;border:1px solid var(--borde);border-radius:var(--radio);padding:24px;position:relative}
.paso::before{counter-increment:p;content:counter(p);display:grid;place-items:center;width:38px;height:38px;border-radius:12px;background:var(--profundo);color:#fff;font-family:"Outfit";font-weight:700;margin-bottom:14px}
.paso p{color:var(--suave);font-size:.95rem}

/* Quiz */
.quiz{max-width:760px;margin:0 auto}
.pregunta{background:var(--fondo);border:1px solid var(--borde);border-radius:var(--radio);padding:22px 24px;margin-bottom:14px}
.pregunta h3{font-size:1.03rem}
.opciones{display:flex;gap:10px;margin-top:12px}
.opciones button{border:1px solid var(--borde);background:#fff;padding:9px 20px;border-radius:10px;font:600 .92rem "Manrope",system-ui,sans-serif;cursor:pointer;color:var(--texto)}
.opciones button:disabled{cursor:default}
.opciones button.bien{background:#dcfce7;border-color:var(--ok);color:#166534}
.opciones button.malo{background:#fee2e2;border-color:var(--mal);color:#991b1b}
.explica{margin-top:12px;color:var(--suave);font-size:.95rem;display:none}
.explica.ver{display:block;animation:entra .4s ease}
.marcador{text-align:center;font-family:"Outfit";font-weight:600;color:var(--profundo);margin-top:18px;font-size:1.1rem}

.nota-final{background:#fff;border:1px solid var(--borde);border-left:5px solid var(--menta);border-radius:var(--radio);padding:26px}
.nota-final p{color:var(--suave)}
.nota-final strong{color:var(--texto)}

.reveal{opacity:0;transform:translateY(24px);transition:opacity .8s ease,transform .8s ease}
.reveal.visible{opacity:1;transform:none}

.subir{position:fixed;right:18px;bottom:18px;width:46px;height:46px;border-radius:14px;background:var(--profundo);color:#fff;border:0;cursor:pointer;display:grid;place-items:center;opacity:0;pointer-events:none;transition:opacity .3s;z-index:30}
.subir.ver{opacity:1;pointer-events:auto}

footer.site{background:var(--profundo);color:#b6d6d1;padding:48px 0 24px;font-size:.93rem}
footer.site .cols{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:28px}
footer.site h4{color:#fff;margin-bottom:10px;font-size:1rem;font-family:"Outfit",sans-serif}
footer.site a{color:#b6d6d1}
footer.site a:hover{color:#7ee8d8}
footer.site ul{list-style:none}
footer.site li+li{margin-top:6px}
.legal-bar{border-top:1px solid rgba(255,255,255,.12);margin-top:28px;padding-top:16px;font-size:.82rem;color:#8fb5af}

.legal{max-width:820px;margin:0 auto;padding:48px 20px 64px}
.legal h1{font-size:2.1rem;margin-bottom:6px}
.legal .fecha{color:var(--suave);font-size:.9rem;margin-bottom:28px}
.legal h2{font-size:1.18rem;margin:28px 0 8px;color:var(--menta-osc)}
.legal p,.legal li{color:#2f4a47}
.legal ul{padding-left:22px;margin-top:8px}
.legal li+li{margin-top:4px}
.datos-legal{background:#fff;border:1px solid var(--borde);border-radius:var(--radio);padding:18px 20px;margin-top:10px}

@media (max-width:900px){
  .hero .wrap,.selector,.irca,footer.site .cols{grid-template-columns:1fr}
  .porque,.pasos{grid-template-columns:1fr 1fr}
  .datos{grid-template-columns:1fr}
  .certs{grid-template-columns:1fr 1fr}
  nav.menu{display:none}
  .hero{padding:48px 0 60px}
  section.bloque{padding:60px 0}
  .btn.sec{margin:10px 0 0}
  .resultado{position:static}
}
@media (max-width:560px){.porque,.pasos{grid-template-columns:1fr}}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation:none!important;transition:none!important}
  .reveal{opacity:1;transform:none}
}