/* ============================================================
   BRAVA GLOBAL — One-page site
   Design tokens: blueprint / drafting-sheet motif
   ============================================================ */

:root{
  /* --- Palette --- */
  --blue-deep:   #001B45;
  --blue-brand:  #004AAD;
  --blue-bright: #1E6BFF;
  --ink:         #0B0E14;
  --paper:       #F5F6F4;
  --paper-2:     #ECEEEA;
  --line:        #D7DBDD;
  --white:       #FFFFFF;
  --orange:      #FF6A1A;
  --ink-soft:    #4A5058;

  /* --- Type --- */
  --f-display: "Space Grotesk", "Segoe UI", sans-serif;
  --f-body:    "Manrope", "Segoe UI", sans-serif;
  --f-mono:    "IBM Plex Mono", ui-monospace, monospace;

  --container: 1240px;
  --header-h: 84px;
}

*,*::before,*::after{ box-sizing:border-box; }
html{ scroll-behavior:smooth; }
body{
  margin:0;
  font-family:var(--f-body);
  color:var(--ink);
  background:var(--paper);
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img{ max-width:100%; display:block; }
a{ color:inherit; text-decoration:none; }
ul{ margin:0; padding:0; list-style:none; }
h1,h2,h3,p{ margin:0; }
section{ position:relative; }

@media (prefers-reduced-motion: reduce){
  html{ scroll-behavior:auto; }
  *{ animation-duration:.001ms !important; animation-iteration-count:1 !important; transition-duration:.001ms !important; }
}

.wrap{
  width:100%;
  max-width:var(--container);
  margin-inline:auto;
  padding-inline:24px;
}

/* ---------- Utility ---------- */
.eyebrow-mono{
  font-family:var(--f-mono);
  font-size:12.5px;
  letter-spacing:.14em;
  color:var(--blue-brand);
  font-weight:500;
  margin:0 0 18px;
  display:flex;
  align-items:center;
  gap:10px;
}
.eyebrow-mono::before{
  content:"";
  width:22px; height:1px;
  background:var(--orange);
  display:inline-block;
}
.eyebrow-mono.light{ color:#BFD3FF; }

.h2{
  font-family:var(--f-display);
  font-weight:600;
  font-size:clamp(30px, 4vw, 46px);
  line-height:1.12;
  letter-spacing:-.01em;
  margin-bottom:20px;
}
.h2.light{ color:var(--white); }
.h3{
  font-family:var(--f-display);
  font-weight:600;
  font-size:clamp(22px,2.4vw,28px);
  margin-bottom:14px;
}
.lead{
  font-size:18px;
  line-height:1.65;
  color:var(--ink-soft);
  max-width:52ch;
  margin-bottom:14px;
}
.lead-narrow{ max-width:60ch; }
p{ color:var(--ink-soft); line-height:1.7; }

.section{ padding:110px 0; }
@media (max-width:800px){ .section{ padding:76px 0; } }

.text-link{
  display:inline-flex; align-items:center; gap:6px;
  font-weight:700; color:var(--blue-brand);
  margin-top:8px;
  position:relative;
}
.text-link span{ transition:transform .25s ease; }
.text-link:hover span{ transform:translateX(4px); }

/* ---------- Buttons ---------- */
.btn{
  display:inline-flex; align-items:center; justify-content:center;
  font-family:var(--f-body); font-weight:700; font-size:15px;
  padding:14px 26px; border-radius:3px;
  border:1.5px solid transparent;
  transition:transform .35s cubic-bezier(.2,.8,.2,1), background .25s ease, border-color .25s ease, color .25s ease, box-shadow .35s ease;
  white-space:nowrap;
}
.btn-primary{
  background:var(--blue-brand); color:var(--white);
  box-shadow:0 0 0 0 rgba(0,74,173,.4);
}
.btn-primary:hover{ background:var(--blue-bright); transform:translateY(-2px); box-shadow:0 10px 24px -8px rgba(0,74,173,.55); }
.btn-ghost{
  background:transparent; color:var(--white); border-color:rgba(255,255,255,.45);
  backdrop-filter:blur(4px);
}
.btn-ghost:hover{ background:rgba(255,255,255,.12); border-color:#fff; transform:translateY(-2px); }
.btn-lg{ padding:16px 30px; font-size:15.5px; }
.btn-block{ width:100%; margin-top:22px; }

/* ---------- Brand lockup ---------- */
.brand{ display:flex; align-items:center; gap:12px; }
.brand-mark{ width:38px; height:auto; color:var(--ink); flex-shrink:0; }
.brand-word{ display:flex; flex-direction:column; line-height:1; }
.brand-word-top{
  font-family:var(--f-display); font-weight:700; font-size:19px;
  color:var(--blue-brand); letter-spacing:.01em;
}
.mirror-r{ display:inline-block; transform:scaleX(-1); color:var(--ink); }
.brand-word-bottom{
  font-family:var(--f-mono); font-weight:500; font-size:9.5px;
  letter-spacing:.32em; color:var(--ink-soft); margin-top:3px;
}
.brand-footer .brand-mark{ color:var(--white); width:46px; }
.brand-footer .mirror-r{ color:var(--white); }
.brand-footer .brand-word-bottom{ color:#9FB3D9; }

/* ============================================================
   HEADER
   ============================================================ */
.site-header{
  position:fixed; inset:0 0 auto 0; z-index:100;
  height:var(--header-h);
  display:flex; align-items:center;
  transition:background .35s ease, box-shadow .35s ease, height .35s ease, backdrop-filter .35s ease;
}
.header-inner{
  display:flex; align-items:center; justify-content:space-between;
  width:100%;
}
.site-header::before{
  content:""; position:absolute; inset:0;
  background:rgba(255,255,255,0); backdrop-filter:blur(0px);
  transition:background .35s ease, backdrop-filter .35s ease, border-color .35s ease;
  border-bottom:1px solid transparent;
  z-index:-1;
}
.site-header.is-scrolled{ height:72px; box-shadow:0 8px 30px -14px rgba(0,0,0,.18); }
.site-header.is-scrolled::before{
  background:rgba(245,246,244,.86);
  backdrop-filter:blur(14px);
  border-color:var(--line);
}
.site-header.on-dark .brand-word-top,
.site-header.on-dark .brand-mark,
.site-header.on-dark .mirror-r,
.site-header.on-dark .main-nav a,
.site-header.on-dark .tel-chip,
.site-header.on-dark .nav-toggle span{ color:var(--white); }
.site-header.on-dark .brand-mark{ color:var(--white); }
.site-header.on-dark:not(.is-scrolled) .nav-toggle span{ background:var(--white); }

.main-nav{ display:flex; gap:34px; }
.main-nav a{
  font-size:14.5px; font-weight:600; color:var(--ink);
  position:relative; padding:6px 0;
}
.main-nav a::after{
  content:""; position:absolute; left:0; right:100%; bottom:0; height:2px;
  background:var(--orange); transition:right .3s cubic-bezier(.2,.8,.2,1);
}
.main-nav a:hover::after{ right:0; }

.header-actions{ display:flex; align-items:center; gap:18px; }
.tel-chip{
  display:flex; align-items:center; gap:7px;
  font-family:var(--f-mono); font-size:13px; font-weight:500;
  color:var(--ink);
}
@media (max-width:1080px){ .tel-chip{ display:none; } }
@media (max-width:900px){ .main-nav{ display:none; } .header-actions .btn{ display:none; } }

.nav-toggle{
  display:none; flex-direction:column; justify-content:center; gap:5px;
  width:34px; height:34px; background:none; border:none; cursor:pointer; padding:0;
}
.nav-toggle span{ width:100%; height:2px; background:var(--ink); transition:transform .3s ease, opacity .3s ease, background .3s ease; }
@media (max-width:900px){ .nav-toggle{ display:flex; } }
.nav-toggle.is-open span:nth-child(1){ transform:translateY(7px) rotate(45deg); }
.nav-toggle.is-open span:nth-child(2){ opacity:0; }
.nav-toggle.is-open span:nth-child(3){ transform:translateY(-7px) rotate(-45deg); }

.mobile-nav{
  position:fixed; top:0; right:0; bottom:0; width:min(340px,86vw); z-index:99;
  background:var(--blue-deep); padding:110px 32px 40px;
  display:flex; flex-direction:column; gap:22px;
  transform:translateX(100%); transition:transform .45s cubic-bezier(.2,.8,.2,1);
}
.mobile-nav.is-open{ transform:translateX(0); }
.mobile-nav a{ color:#fff; font-family:var(--f-display); font-size:20px; font-weight:600; }
.mobile-nav .tel-chip{ display:flex; color:#9FB3D9; margin-top:12px; }

/* ============================================================
   HERO
   ============================================================ */
.hero{
  position:relative; min-height:100svh;
  display:flex; align-items:flex-end;
  overflow:hidden;
  color:#fff;
}
.hero-media{ position:absolute; inset:0; z-index:0; }
.hero-media img{
  width:100%; height:100%; object-fit:cover;
  animation:kenburns 26s ease-in-out infinite alternate;
}
@keyframes kenburns{
  0%{ transform:scale(1) translate(0,0); }
  100%{ transform:scale(1.1) translate(-1%,-1%); }
}
.hero-scrim{
  position:absolute; inset:0;
  background:
    linear-gradient(180deg, rgba(0,10,30,.55) 0%, rgba(0,10,30,.25) 32%, rgba(0,10,30,.55) 68%, rgba(0,10,30,.92) 100%);
}
.hero-grid{
  position:absolute; inset:0; opacity:.16; pointer-events:none;
  background-image:
    linear-gradient(rgba(255,255,255,.5) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.5) 1px, transparent 1px);
  background-size:64px 64px;
  mask-image:linear-gradient(180deg, black, transparent 85%);
}
.frame-bracket{ position:absolute; width:26px; height:26px; border:2px solid rgba(255,255,255,.55); z-index:2; }
.bracket-tl{ top:28px; left:24px; border-right:none; border-bottom:none; }
.bracket-tr{ top:28px; right:24px; border-left:none; border-bottom:none; }
.bracket-bl{ bottom:28px; left:24px; border-right:none; border-top:none; }
.bracket-br{ bottom:28px; right:24px; border-left:none; border-top:none; }
@media (max-width:700px){ .frame-bracket{ display:none; } }

.hero-content{ position:relative; z-index:1; padding-bottom:min(11vh,120px); padding-top:calc(var(--header-h) + 40px); }
.hero-title{
  font-family:var(--f-display); font-weight:700;
  font-size:clamp(40px, 7vw, 84px);
  line-height:1.02; letter-spacing:-.02em;
  margin-bottom:24px; max-width:16ch;
}
.hero-title em{ font-style:normal; color:#BFD3FF; }
.hero-sub{
  font-size:clamp(16px,1.6vw,19px); line-height:1.6;
  max-width:46ch; color:rgba(255,255,255,.86); margin-bottom:34px;
}
.hero-cta{ display:flex; gap:16px; flex-wrap:wrap; }

.scroll-cue{
  position:absolute; bottom:26px; left:50%; transform:translateX(-50%);
  z-index:2; width:26px; height:42px; border:2px solid rgba(255,255,255,.6);
  border-radius:14px;
}
.scroll-cue span{
  position:absolute; top:7px; left:50%; width:4px; height:8px; margin-left:-2px;
  background:#fff; border-radius:2px;
  animation:cueMove 1.8s ease infinite;
}
@keyframes cueMove{ 0%{ opacity:1; transform:translateY(0);} 70%{opacity:0;} 100%{ opacity:0; transform:translateY(14px);} }
@media (max-width:700px){ .scroll-cue{ display:none; } }

/* ============================================================
   MARQUEE
   ============================================================ */
.marquee-band{
  background:var(--ink); color:#fff; overflow:hidden;
  padding:16px 0; border-bottom:1px solid rgba(255,255,255,.08);
}
.marquee-track{ display:flex; width:max-content; animation:scrollMarquee 32s linear infinite; }
.marquee-group{ display:flex; align-items:center; flex-shrink:0; }
.marquee-group span{
  font-family:var(--f-mono); font-size:13px; letter-spacing:.1em; font-weight:500;
  padding:0 22px; color:#D8DEEA; white-space:nowrap;
}
.marquee-group i{ width:6px; height:6px; background:var(--orange); border-radius:50%; flex-shrink:0; }
@keyframes scrollMarquee{ from{ transform:translateX(0);} to{ transform:translateX(-50%);} }

/* ============================================================
   STATS
   ============================================================ */
.stats-strip{ background:var(--white); border-bottom:1px solid var(--line); padding:56px 0; }
.stats-grid{
  display:grid; grid-template-columns:repeat(4,1fr); gap:32px;
}
@media (max-width:800px){ .stats-grid{ grid-template-columns:repeat(2,1fr); row-gap:36px; } }
.stat{ text-align:left; border-left:2px solid var(--orange); padding-left:16px; }
.stat-num{
  display:block; font-family:var(--f-display); font-weight:700;
  font-size:clamp(30px,3.2vw,42px); color:var(--blue-brand); line-height:1;
}
.stat-label{
  display:block; margin-top:10px; font-size:13px; color:var(--ink-soft);
  max-width:20ch;
}

/* ============================================================
   REVEAL ANIMATION
   ============================================================ */
.reveal{
  opacity:0; transform:translateY(28px);
  transition:opacity .8s cubic-bezier(.2,.7,.2,1), transform .8s cubic-bezier(.2,.7,.2,1);
  transition-delay:var(--d,0s);
}
.reveal.in-view{ opacity:1; transform:translateY(0); }

/* ============================================================
   SPLIT LAYOUT (Nosotros / Confianza)
   ============================================================ */
.split-layout{
  display:grid; grid-template-columns:.85fr 1fr; gap:64px; align-items:center;
}
.split-reverse{ grid-template-columns:1fr .85fr; }
.split-reverse .split-media{ order:2; }
.split-reverse .split-text{ order:1; }
@media (max-width:900px){
  .split-layout, .split-reverse{ grid-template-columns:1fr; }
  .split-reverse .split-media,.split-reverse .split-text{ order:initial; }
}

.bento-photos{
  display:grid; grid-template-columns:1fr 1fr; gap:16px;
}
.bento-tall{ position:relative; aspect-ratio:3/4.4; border-radius:4px; overflow:hidden; margin:0; }
.bento-tall img{ width:100%; height:100%; object-fit:cover; transition:transform .7s cubic-bezier(.2,.7,.2,1); }
.bento-tall:hover img{ transform:scale(1.06); }
.bento-tall figcaption{
  position:absolute; left:0; right:0; bottom:0; padding:16px;
  font-family:var(--f-mono); font-size:11.5px; letter-spacing:.06em; color:#fff;
  background:linear-gradient(0deg, rgba(0,0,0,.65), transparent);
}

.bento-trio{ grid-template-columns:1fr 1fr; }
.bento-trio figure{ position:relative; aspect-ratio:1/1; border-radius:4px; overflow:hidden; margin:0; }
.bento-trio .bento-wide{ grid-column:1/-1; aspect-ratio:16/9; }
.bento-trio img{ width:100%; height:100%; object-fit:cover; transition:transform .7s cubic-bezier(.2,.7,.2,1); }
.bento-trio figure:hover img{ transform:scale(1.06); }

/* ============================================================
   MISSION / VISION / VALUES
   ============================================================ */
.mvv-section{ background:var(--blue-deep); color:#fff; overflow:hidden; }
.mvv-bg{ position:absolute; inset:0; z-index:0; }
.mvv-bg img{ width:100%; height:100%; object-fit:cover; opacity:.22; }
.mvv-bg::after{ content:""; position:absolute; inset:0; background:linear-gradient(180deg, var(--blue-deep) 0%, rgba(0,27,69,.75) 40%, var(--blue-deep) 100%); }
.mvv-section .wrap{ position:relative; z-index:1; }

.mvv-grid{
  display:grid; grid-template-columns:repeat(3,1fr); gap:24px; margin-top:44px;
}
@media (max-width:900px){ .mvv-grid{ grid-template-columns:1fr; } }
.mvv-card{
  background:rgba(255,255,255,.06);
  border:1px solid rgba(255,255,255,.14);
  border-radius:6px; padding:30px 26px;
  backdrop-filter:blur(6px);
  transition:transform .4s ease, background .4s ease, border-color .4s ease;
}
.mvv-card:hover{ transform:translateY(-6px); background:rgba(255,255,255,.09); border-color:rgba(255,255,255,.3); }
.mvv-tag{
  display:block; font-family:var(--f-mono); font-size:11.5px; letter-spacing:.12em;
  color:var(--orange); margin-bottom:16px; font-weight:600;
}
.mvv-card p{ color:#DCE4F2; line-height:1.7; font-size:15.5px; }
.values-list li{ padding:9px 0; border-top:1px solid rgba(255,255,255,.12); font-size:14.5px; color:#DCE4F2; line-height:1.55; }
.values-list li:first-child{ border-top:none; }
.values-list strong{ color:#fff; }

/* ---------- skyline divider ---------- */
.skyline-divider{
  display:block; width:100%; height:44px; color:var(--line);
  background:var(--paper);
}
.skyline-divider svg{ width:100%; height:100%; display:block; }

/* ============================================================
   SERVICES GRID
   ============================================================ */
.services-grid{
  display:grid; grid-template-columns:repeat(4,1fr); gap:18px; margin-top:44px;
}
@media (max-width:1080px){ .services-grid{ grid-template-columns:repeat(2,1fr); } }
@media (max-width:560px){ .services-grid{ grid-template-columns:1fr; } }

.svc-card{
  position:relative; aspect-ratio:3/3.6; border-radius:5px; overflow:hidden;
  isolation:isolate;
}
.svc-card img{
  width:100%; height:100%; object-fit:cover;
  transition:transform .6s cubic-bezier(.2,.7,.2,1);
}
.svc-card:hover img{ transform:scale(1.08); }
.svc-overlay{
  position:absolute; inset:0; z-index:1; padding:18px;
  display:flex; flex-direction:column; justify-content:flex-end;
  background:linear-gradient(180deg, rgba(0,10,30,0) 30%, rgba(0,10,30,.55) 70%, rgba(0,10,30,.92) 100%);
}
.svc-no{
  font-family:var(--f-mono); font-size:11px; letter-spacing:.1em;
  color:var(--orange); font-weight:600; margin-bottom:8px;
}
.svc-overlay h3{
  font-family:var(--f-display); font-weight:600; font-size:16.5px; color:#fff; line-height:1.32;
}

/* ============================================================
   STATEMENT BAND
   ============================================================ */
.statement-band{
  position:relative; min-height:56vh; display:flex; align-items:center; justify-content:center;
  overflow:hidden; margin:0;
}
.statement-media{ position:absolute; inset:0; }
.statement-media img{ width:100%; height:100%; object-fit:cover; }
.statement-media::after{
  content:""; position:absolute; inset:0; background:linear-gradient(180deg, rgba(0,10,30,.55), rgba(0,10,30,.72));
}
.statement-band .wrap{ position:relative; z-index:1; text-align:center; }
.statement-text{
  font-family:var(--f-display); font-weight:600; font-style:normal;
  font-size:clamp(24px,4vw,44px); color:#fff; line-height:1.28; max-width:18ch; margin-inline:auto;
}

/* ============================================================
   GALLERY
   ============================================================ */
.gallery-grid{
  display:grid; grid-template-columns:1fr 1fr; gap:18px;
  max-width:var(--container); margin:44px auto 0; padding-inline:24px;
}
@media (max-width:800px){ .gallery-grid{ grid-template-columns:1fr; } }
.gallery-item{ position:relative; aspect-ratio:4/5; border-radius:5px; overflow:hidden; margin:0; }
.gallery-item img{ width:100%; height:100%; object-fit:cover; transition:transform .8s cubic-bezier(.2,.7,.2,1); }
.gallery-item:hover img{ transform:scale(1.06); }
.gallery-item figcaption{
  position:absolute; inset:0; padding:26px;
  display:flex; flex-direction:column; justify-content:flex-end;
  background:linear-gradient(0deg, rgba(0,10,30,.78), rgba(0,10,30,0) 55%);
}
.tag-mono{ font-family:var(--f-mono); font-size:11px; letter-spacing:.14em; color:var(--orange); font-weight:600; margin-bottom:10px; }
.gallery-item figcaption p{ font-family:var(--f-display); font-weight:600; font-size:22px; color:#fff; line-height:1.3; max-width:16ch; }

/* ============================================================
   CONFIANZA
   ============================================================ */
.confianza-section{ background:var(--paper-2); }
.compliance-list{ margin-top:26px; display:flex; flex-direction:column; gap:0; }
.compliance-list li{
  display:flex; gap:16px; padding:18px 0; border-top:1px solid var(--line);
}
.compliance-list li:last-child{ border-bottom:1px solid var(--line); }
.stamp{
  flex-shrink:0; width:30px; height:30px; border-radius:50%;
  border:1.5px solid var(--blue-brand); color:var(--blue-brand);
  display:flex; align-items:center; justify-content:center; font-weight:700; font-size:14px;
}
.compliance-list strong{ display:block; font-family:var(--f-display); font-size:16px; color:var(--ink); margin-bottom:3px; }
.compliance-list p{ font-size:14px; margin:0; line-height:1.55; }

/* ============================================================
   CONTACT / LOCATION
   ============================================================ */
.contact-grid{
  display:grid; grid-template-columns:1.05fr .95fr; gap:56px; margin-top:44px; align-items:start;
}
@media (max-width:900px){ .contact-grid{ grid-template-columns:1fr; } }

.location-photo{ margin:0 0 16px; border-radius:5px; overflow:hidden; aspect-ratio:16/8; }
.location-photo img{ width:100%; height:100%; object-fit:cover; }
.map-embed{ border-radius:5px; overflow:hidden; border:1px solid var(--line); }
.map-embed iframe{ width:100%; height:280px; border:0; display:block; filter:grayscale(.15) contrast(1.02); }
.address-line{ margin-top:14px; font-family:var(--f-mono); font-size:13px; color:var(--ink-soft); }

.contact-cards{ display:flex; flex-direction:column; gap:10px; margin-top:26px; }
.contact-card{
  display:flex; justify-content:space-between; align-items:center;
  padding:16px 18px; border:1px solid var(--line); border-radius:4px;
  background:var(--white);
  transition:border-color .25s ease, transform .25s ease, box-shadow .25s ease;
}
.contact-card:hover{ border-color:var(--blue-brand); transform:translateX(4px); box-shadow:0 8px 24px -14px rgba(0,74,173,.4); }
.cc-label{ font-family:var(--f-mono); font-size:11px; letter-spacing:.1em; color:var(--ink-soft); }
.cc-value{ font-weight:700; font-size:14.5px; color:var(--blue-brand); }

/* ============================================================
   FOOTER
   ============================================================ */
.site-footer{ background:var(--blue-deep); color:#B9C6E0; padding:74px 0 0; }
.footer-grid{
  display:grid; grid-template-columns:1.5fr 1fr 1fr 1fr; gap:40px; padding-bottom:56px;
  border-bottom:1px solid rgba(255,255,255,.12);
}
@media (max-width:900px){ .footer-grid{ grid-template-columns:1fr 1fr; } }
@media (max-width:560px){ .footer-grid{ grid-template-columns:1fr; } }
.footer-brand p{ margin-top:16px; font-size:14px; line-height:1.7; max-width:34ch; color:#9FB0CE; }
.footer-col{ display:flex; flex-direction:column; gap:12px; }
.footer-heading{ font-family:var(--f-mono); font-size:11.5px; letter-spacing:.12em; color:#6E85B3; margin-bottom:6px; }
.footer-col a, .footer-muted{ font-size:14.5px; color:#C4D0E6; transition:color .2s ease; }
.footer-col a:hover{ color:#fff; }
.footer-muted{ color:#7C8FB5; }
.footer-bottom{
  display:flex; justify-content:space-between; padding:24px 0; font-size:12.5px;
  color:#6E85B3; font-family:var(--f-mono);
}
@media (max-width:560px){ .footer-bottom{ flex-direction:column; gap:8px; text-align:center; } }

/* ============================================================
   FLOATING BUTTONS
   ============================================================ */
.wa-float{
  position:fixed; right:22px; bottom:22px; z-index:80;
  width:56px; height:56px; border-radius:50%; background:#25D366; color:#fff;
  display:flex; align-items:center; justify-content:center;
  box-shadow:0 10px 30px -8px rgba(0,0,0,.4);
  animation:pulse 2.6s ease infinite;
}
@keyframes pulse{
  0%,100%{ box-shadow:0 10px 30px -8px rgba(37,211,102,.5); }
  50%{ box-shadow:0 10px 30px -4px rgba(37,211,102,.85); }
}
.back-to-top{
  position:fixed; right:22px; bottom:88px; z-index:80;
  width:44px; height:44px; border-radius:50%; background:var(--ink); color:#fff;
  border:none; display:flex; align-items:center; justify-content:center; cursor:pointer;
  opacity:0; pointer-events:none; transform:translateY(10px);
  transition:opacity .3s ease, transform .3s ease;
}
.back-to-top.is-visible{ opacity:1; pointer-events:auto; transform:translateY(0); }
@media (max-width:560px){
  .wa-float{ width:50px; height:50px; right:16px; bottom:16px; }
  .back-to-top{ width:40px; height:40px; right:18px; bottom:76px; }
}