/* ============================================================
   Grifo Ahorrador — estilos
   Paleta: azul agua + verde eco sobre blanco/gris muy claro.
   Mobile-first, responsive, sin frameworks.
   ============================================================ */

:root {
  --azul: #0EA5E9;
  --azul-osc: #0369A1;
  --verde: #16A34A;
  --verde-osc: #15803D;
  --tinta: #0F172A;
  --gris: #475569;
  --gris-cl: #64748B;
  --linea: #E2E8F0;
  --fondo: #FFFFFF;
  --fondo-alt: #F1F5F9;
  --blanco: #FFFFFF;

  --radio: 16px;
  --radio-sm: 10px;
  --sombra: 0 10px 30px rgba(2, 8, 23, .08);
  --sombra-sm: 0 4px 14px rgba(2, 8, 23, .06);
  --max: 1120px;
  --fuente: "Poppins", system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--fuente);
  color: var(--tinta);
  background: var(--fondo);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; height: auto; display: block; }

a { color: var(--azul-osc); text-decoration: none; }
a:hover { text-decoration: underline; }

h1, h2, h3 { line-height: 1.2; margin: 0 0 .5em; }

.container {
  width: 100%;
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 20px;
}
.container-narrow { max-width: 760px; }

.center { text-align: center; }

/* ---------- Botones ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .5em;
  font-family: inherit;
  font-weight: 700;
  font-size: 1rem;
  line-height: 1;
  padding: .85em 1.5em;
  border-radius: 999px;
  border: 2px solid transparent;
  cursor: pointer;
  transition: transform .15s ease, box-shadow .15s ease, background .15s ease;
  text-decoration: none;
}
.btn:hover { text-decoration: none; transform: translateY(-2px); }
.btn-sm { padding: .55em 1.1em; font-size: .9rem; }
.btn-lg { padding: 1em 1.9em; font-size: 1.05rem; }
.btn-block { width: 100%; }

.btn-primary { background: var(--verde); color: #fff; box-shadow: 0 8px 20px rgba(22,163,74,.28); }
.btn-primary:hover { background: var(--verde-osc); }

.btn-whatsapp { background: #25D366; color: #063e1f; box-shadow: 0 8px 20px rgba(37,211,102,.3); }
.btn-whatsapp:hover { background: #1FB855; }

.btn-outline { background: transparent; color: var(--azul-osc); border-color: var(--azul); }
.btn-outline:hover { background: var(--azul); color: #fff; }

.ico { width: 1.25em; height: 1.25em; fill: currentColor; }

/* ---------- Header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255,255,255,.9);
  backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid var(--linea);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 64px; }

.logo { display: inline-flex; align-items: center; gap: .5em; font-weight: 800; color: var(--tinta); }
.logo:hover { text-decoration: none; }
.logo-mark { font-size: 1.4rem; }
.logo-text { font-size: 1.15rem; letter-spacing: -.01em; }
.logo-text strong { color: var(--azul-osc); }

.main-nav { display: flex; align-items: center; }
.nav-menu { display: flex; align-items: center; gap: 1.4rem; list-style: none; margin: 0; padding: 0; }
.nav-menu a { color: var(--gris); font-weight: 600; font-size: .95rem; }
.nav-menu a:hover { color: var(--azul-osc); text-decoration: none; }
.nav-menu .btn { color: #fff; }

.nav-toggle {
  display: none;
  flex-direction: column; gap: 5px;
  background: none; border: 0; cursor: pointer; padding: 8px;
}
.nav-toggle span { width: 24px; height: 2px; background: var(--tinta); border-radius: 2px; transition: .2s; }

/* ---------- Hero ---------- */
.hero {
  background:
    radial-gradient(1200px 400px at 80% -10%, rgba(14,165,233,.15), transparent 60%),
    linear-gradient(180deg, #F8FBFF 0%, #ffffff 100%);
  padding: clamp(2.5rem, 6vw, 5rem) 0;
}
.hero-inner { display: grid; grid-template-columns: 1fr; gap: 2.5rem; align-items: center; }

.badge {
  display: inline-block;
  background: rgba(14,165,233,.12);
  color: var(--azul-osc);
  font-weight: 600; font-size: .85rem;
  padding: .4em .9em; border-radius: 999px;
  margin-bottom: 1rem;
}
.hero h1 { font-size: clamp(2rem, 5vw, 3.25rem); font-weight: 800; letter-spacing: -.02em; }
.hero h1 .hl { color: var(--azul-osc); position: relative; }
.hero-sub { font-size: 1.15rem; color: var(--gris); max-width: 32em; }
.hero-cta { display: flex; flex-wrap: wrap; gap: .8rem; margin: 1.6rem 0; }

.trust-badges { display: flex; flex-wrap: wrap; gap: 1rem 1.5rem; list-style: none; padding: 0; margin: 0; color: var(--gris); font-size: .95rem; font-weight: 600; }

.hero-media img {
  margin: 0 auto;
  filter: drop-shadow(0 30px 40px rgba(3,105,161,.18));
  border-radius: var(--radio);
}

/* ---------- Barra de beneficios ---------- */
.benefits-bar { background: linear-gradient(90deg, var(--azul-osc), var(--azul)); color: #fff; }
.benefits-bar-inner { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.5rem 1rem; padding: 2rem 20px; text-align: center; }
.stat-num { display: block; font-size: clamp(1.8rem, 5vw, 2.5rem); font-weight: 800; line-height: 1; }
.stat-label { display: block; font-size: .9rem; opacity: .92; margin-top: .4rem; }

/* ---------- Secciones ---------- */
.section { padding: clamp(3rem, 7vw, 5rem) 0; }
.section-alt { background: var(--fondo-alt); }
.section-head { text-align: center; max-width: 40em; margin: 0 auto 2.5rem; }
.section-head h2 { font-size: clamp(1.6rem, 4vw, 2.3rem); font-weight: 800; letter-spacing: -.01em; }
.section-head p { color: var(--gris); font-size: 1.08rem; margin: 0; }

/* ---------- Pasos ---------- */
.steps { display: grid; grid-template-columns: 1fr; gap: 1.5rem; list-style: none; padding: 0; margin: 0; counter-reset: step; }
.step { background: var(--blanco); border: 1px solid var(--linea); border-radius: var(--radio); padding: 2rem 1.5rem; text-align: center; box-shadow: var(--sombra-sm); }
.step-ico { font-size: 2.5rem; margin-bottom: .6rem; }
.step h3 { font-size: 1.2rem; }
.step p { color: var(--gris); margin: 0; }

/* ---------- Tarjetas ---------- */
.cards { display: grid; grid-template-columns: 1fr; gap: 1.5rem; }
.card { background: var(--blanco); border: 1px solid var(--linea); border-radius: var(--radio); padding: 2rem 1.5rem; box-shadow: var(--sombra-sm); transition: transform .2s ease, box-shadow .2s ease; }
.card:hover { transform: translateY(-4px); box-shadow: var(--sombra); }
.card-ico { font-size: 2.2rem; margin-bottom: .5rem; }
.card h3 { font-size: 1.25rem; }
.card p { color: var(--gris); margin: 0; }

/* ---------- Calculadora ---------- */
.calc { display: grid; grid-template-columns: 1fr; gap: 1.5rem; background: var(--blanco); border: 1px solid var(--linea); border-radius: var(--radio); box-shadow: var(--sombra); overflow: hidden; }
.calc-form { padding: 1.8rem; display: grid; gap: 1.1rem; }
.calc-result { background: linear-gradient(160deg, var(--azul-osc), var(--azul)); color: #fff; padding: 2rem 1.8rem; display: flex; flex-direction: column; justify-content: center; align-items: flex-start; gap: .5rem; }
.calc-amount { font-size: clamp(2.2rem, 7vw, 3rem); font-weight: 800; line-height: 1; display: block; }
.calc-cap { opacity: .92; }
.calc-note { opacity: .9; margin: .2rem 0 1rem; }
.calc-result .btn { background: #fff; color: var(--verde-osc); }
.calc-result .btn:hover { background: #f0fdf4; }

/* ---------- Campos de formulario ---------- */
.field { display: grid; gap: .35rem; }
.field label { font-weight: 600; font-size: .92rem; color: var(--tinta); }
.field input, .field select, .field textarea {
  font-family: inherit; font-size: 1rem;
  padding: .75em .9em;
  border: 1px solid var(--linea); border-radius: var(--radio-sm);
  background: #fff; color: var(--tinta);
  width: 100%;
}
.field input:focus, .field select:focus, .field textarea:focus {
  outline: none; border-color: var(--azul); box-shadow: 0 0 0 3px rgba(14,165,233,.18);
}
.field-row { display: grid; grid-template-columns: 1fr; gap: 1.1rem; }

/* ---------- Mini cards (otros productos) ---------- */
.mini-cards { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1rem; list-style: none; padding: 0; margin: 0 0 1.8rem; }
.mini-card { background: var(--blanco); border: 1px solid var(--linea); border-radius: var(--radio-sm); padding: 1rem 1.1rem; font-weight: 600; color: var(--gris); display: flex; align-items: center; gap: .6rem; box-shadow: var(--sombra-sm); }
.mini-card span { font-size: 1.3rem; }

/* ---------- Testimonios ---------- */
.testimonial { background: var(--blanco); border: 1px solid var(--linea); border-left: 4px solid var(--azul); border-radius: var(--radio); padding: 1.6rem; margin: 0; box-shadow: var(--sombra-sm); }
.testimonial p { font-style: italic; color: var(--tinta); }
.testimonial footer { color: var(--gris-cl); font-weight: 600; font-size: .92rem; }

/* ---------- FAQ ---------- */
.faq { display: grid; gap: .8rem; }
.faq details { background: var(--blanco); border: 1px solid var(--linea); border-radius: var(--radio-sm); padding: .3rem 1.2rem; box-shadow: var(--sombra-sm); }
.faq summary { cursor: pointer; font-weight: 700; padding: .9rem 0; list-style: none; position: relative; padding-right: 2rem; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; position: absolute; right: 0; top: 50%; transform: translateY(-50%); font-size: 1.4rem; color: var(--azul); transition: transform .2s; }
.faq details[open] summary::after { content: "−"; }
.faq details p { margin: 0 0 1rem; color: var(--gris); }

/* ---------- CTA / formulario ---------- */
.cta-section { background: linear-gradient(180deg, #ffffff 0%, #F8FBFF 100%); }
.lead-form { background: var(--blanco); border: 1px solid var(--linea); border-radius: var(--radio); padding: 2rem; box-shadow: var(--sombra); display: grid; gap: 1.1rem; }
.form-alt { text-align: center; color: var(--gris); margin: 0; }
.form-msg { text-align: center; font-weight: 600; margin: 0; min-height: 1.2em; }
.form-msg.ok { color: var(--verde-osc); }
.form-msg.err { color: #DC2626; }
.hp { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }

/* ---------- Footer ---------- */
.site-footer { background: var(--tinta); color: #CBD5E1; margin-top: 2rem; }
.footer-inner { display: grid; grid-template-columns: 1fr; gap: 2rem; padding: 3rem 20px 2rem; }
.site-footer .logo, .site-footer .logo-text { color: #fff; }
.site-footer .logo-text strong { color: var(--azul); }
.footer-col h3 { color: #fff; font-size: 1.05rem; }
.footer-col p { color: #94A3B8; }
.footer-list { list-style: none; padding: 0; margin: 0; display: grid; gap: .5rem; }
.footer-list a { color: #CBD5E1; }
.footer-list a:hover { color: #fff; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,.1); padding: 1.2rem 0; font-size: .88rem; color: #94A3B8; }
.footer-bottom p { margin: 0; text-align: center; }

/* ---------- WhatsApp flotante ---------- */
.wa-float {
  position: fixed; right: 18px; bottom: 18px; z-index: 60;
  width: 56px; height: 56px; border-radius: 50%;
  background: #25D366; color: #fff;
  display: flex; align-items: center; justify-content: center;
  box-shadow: 0 8px 24px rgba(37,211,102,.45);
  animation: wa-pulse 2.4s infinite;
}
.wa-float:hover { text-decoration: none; transform: scale(1.06); }
.wa-float svg { width: 32px; height: 32px; fill: #fff; }
@keyframes wa-pulse {
  0% { box-shadow: 0 8px 24px rgba(37,211,102,.45), 0 0 0 0 rgba(37,211,102,.5); }
  70% { box-shadow: 0 8px 24px rgba(37,211,102,.45), 0 0 0 16px rgba(37,211,102,0); }
  100% { box-shadow: 0 8px 24px rgba(37,211,102,.45), 0 0 0 0 rgba(37,211,102,0); }
}

/* ---------- Animación reveal ---------- */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity .6s ease, transform .6s ease; }
.reveal.is-visible { opacity: 1; transform: none; }

/* ============================================================
   Responsive
   ============================================================ */
@media (min-width: 640px) {
  .field-row { grid-template-columns: 1fr 1fr; }
  .benefits-bar-inner { grid-template-columns: repeat(4, 1fr); }
  .mini-cards { grid-template-columns: repeat(3, 1fr); }
}

@media (min-width: 860px) {
  .hero-inner { grid-template-columns: 1.1fr .9fr; }
  .steps { grid-template-columns: repeat(3, 1fr); }
  .cards { grid-template-columns: repeat(3, 1fr); }
  .calc { grid-template-columns: 1.2fr 1fr; }
}

/* Menú móvil */
@media (max-width: 859px) {
  .nav-toggle { display: flex; }
  .nav-menu {
    position: fixed; inset: 64px 0 auto 0;
    flex-direction: column; align-items: stretch;
    gap: 0;
    background: #fff; border-bottom: 1px solid var(--linea);
    padding: .5rem 20px 1rem;
    box-shadow: var(--sombra);
    transform: translateY(-120%);
    transition: transform .25s ease;
  }
  .nav-menu.open { transform: translateY(0); }
  .nav-menu li { padding: .3rem 0; }
  .nav-menu .btn { text-align: center; margin-top: .4rem; }
}

/* Respeta preferencia de menos movimiento */
@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
}