/* =============================================================
   Backup Ágil — Design System
   Aesthetic: "Secure Tech" — midnight navy + aqua/cyan (marca)
   Fonts: Sora (display) + Manrope (body)
   Base: Bootstrap 5 (customizado)
   ============================================================= */

/* ---------- 1. Tokens ---------- */
:root {
  /* Marca (ciano do logo) */
  --aqua-300: #6ff5e4;
  --aqua-400: #22e0c8;
  --aqua-500: #10cbb2;   /* accent principal */
  --aqua-600: #08a893;

  /* Azul de apoio (tecnologia/confiança) */
  --blue-400: #3b82f6;
  --blue-500: #2563eb;
  --blue-600: #1d4ed8;

  /* Verde "seguro" */
  --safe-500: #16b981;

  /* Alerta (dor/risco) */
  --danger-500: #ef4444;
  --warn-500:   #f59e0b;

  /* Navy / neutros */
  --ink-900: #060b18;   /* fundo mais escuro */
  --ink-800: #0a1024;   /* hero / dark sections */
  --ink-700: #111a30;
  --ink-600: #1b2743;

  --slate-900: #0f172a;
  --slate-700: #334155;
  --slate-500: #64748b;
  --slate-400: #94a3b8;
  --slate-300: #cbd5e1;
  --slate-200: #e2e8f0;
  --slate-100: #f1f5f9;
  --slate-50:  #f7f9fc;
  --white:     #ffffff;

  /* Semânticos (tema claro por padrão nas seções internas) */
  --bg:          var(--white);
  --bg-alt:      var(--slate-50);
  --text:        var(--slate-900);
  --text-muted:  #56637a;
  --border:      #e6ebf3;
  --brand:       var(--aqua-600);
  --brand-strong:var(--blue-600);

  /* Efeitos */
  --gradient-brand: linear-gradient(135deg, var(--aqua-400) 0%, var(--blue-500) 100%);
  --gradient-brand-soft: linear-gradient(135deg, rgba(34,224,200,.14), rgba(37,99,235,.14));
  --shadow-sm: 0 1px 2px rgba(15,23,42,.06), 0 1px 3px rgba(15,23,42,.08);
  --shadow-md: 0 8px 24px -6px rgba(15,23,42,.12), 0 2px 6px rgba(15,23,42,.06);
  --shadow-lg: 0 24px 60px -12px rgba(10,16,36,.22);
  --shadow-glow: 0 0 0 1px rgba(16,203,178,.25), 0 20px 60px -18px rgba(16,203,178,.45);

  --radius-sm: 10px;
  --radius:    16px;
  --radius-lg: 24px;
  --radius-xl: 32px;

  --container: 1200px;
  --ease: cubic-bezier(.22,.61,.36,1);

  --font-display: 'Sora', system-ui, -apple-system, sans-serif;
  --font-body: 'Manrope', system-ui, -apple-system, sans-serif;
}

/* ---------- 2. Base ---------- */
* { box-sizing: border-box; }

html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .001ms !important; transition-duration: .001ms !important; }
}

body {
  font-family: var(--font-body);
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

h1, h2, h3, h4, .display-font {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.12;
  letter-spacing: -.02em;
  color: var(--slate-900);
}

a { color: var(--brand-strong); text-decoration: none; transition: color .2s var(--ease); }
a:hover { color: var(--aqua-600); }

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

.container { max-width: var(--container); }

::selection { background: var(--aqua-400); color: var(--ink-800); }

/* Scrollbar */
::-webkit-scrollbar { width: 12px; height: 12px; }
::-webkit-scrollbar-thumb { background: #c3ccd9; border-radius: 20px; border: 3px solid var(--white); }
::-webkit-scrollbar-thumb:hover { background: var(--slate-400); }

/* ---------- 3. Utilitários ---------- */
.section { padding: clamp(4.5rem, 8vw, 8rem) 0; position: relative; }
.section--tight { padding: clamp(3rem, 6vw, 5rem) 0; }
.bg-alt { background: var(--bg-alt); }
.bg-ink { background: var(--ink-800); color: var(--slate-200); }
.bg-ink h1, .bg-ink h2, .bg-ink h3, .bg-ink h4 { color: #fff; }

.text-gradient {
  background: var(--gradient-brand);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent; color: transparent;
}
.text-aqua { color: var(--aqua-600); }
.text-muted-2 { color: var(--text-muted) !important; }

.eyebrow {
  display: inline-flex; align-items: center; gap: .5rem;
  font-family: var(--font-body);
  font-weight: 700; font-size: .8rem; letter-spacing: .12em; text-transform: uppercase;
  color: var(--aqua-600);
  padding: .4rem .85rem;
  border-radius: 100px;
  background: var(--gradient-brand-soft);
  border: 1px solid rgba(16,203,178,.22);
}
.bg-ink .eyebrow { color: var(--aqua-300); background: rgba(16,203,178,.10); border-color: rgba(111,245,228,.20); }

.section-head { max-width: 720px; margin: 0 auto 3.5rem; text-align: center; }
.section-head h2 { font-size: clamp(1.9rem, 3.4vw, 3rem); margin: 1.1rem 0 .9rem; }
.section-head p { font-size: 1.125rem; color: var(--text-muted); margin: 0; }

.lead-lg { font-size: clamp(1.05rem, 1.6vw, 1.3rem); color: var(--text-muted); }

/* ---------- 4. Botões ---------- */
.btn {
  --bs-btn-focus-box-shadow: none;
  font-family: var(--font-display);
  font-weight: 600;
  border-radius: 100px;
  padding: .85rem 1.7rem;
  transition: transform .25s var(--ease), box-shadow .25s var(--ease), background .25s var(--ease);
  border: none;
  display: inline-flex; align-items: center; gap: .6rem;
}
.btn:active { transform: translateY(1px); }

.btn-brand {
  background: var(--gradient-brand);
  color: #04121f;
  box-shadow: 0 10px 30px -8px rgba(16,203,178,.55);
}
.btn-brand:hover {
  color: #04121f;
  transform: translateY(-2px);
  box-shadow: 0 18px 40px -10px rgba(16,203,178,.7);
}
.btn-ghost {
  background: transparent;
  color: var(--slate-900);
  border: 1.5px solid var(--border);
}
.btn-ghost:hover { border-color: var(--aqua-500); color: var(--aqua-600); background: rgba(16,203,178,.05); }
.bg-ink .btn-ghost { color: #fff; border-color: rgba(255,255,255,.22); }
.bg-ink .btn-ghost:hover { border-color: var(--aqua-400); color: var(--aqua-300); background: rgba(255,255,255,.04); }

.btn-lg { padding: 1.05rem 2.1rem; font-size: 1.05rem; }
.btn-block-sm { }
@media (max-width: 575px){ .btn-block-sm { width: 100%; justify-content: center; } }

/* ---------- 5. Navbar ---------- */
.navbar {
  padding: 1rem 0;
  transition: background .3s var(--ease), box-shadow .3s var(--ease), padding .3s var(--ease);
  background: transparent;
}
.navbar.scrolled {
  background: rgba(8,13,28,.82);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  box-shadow: 0 1px 0 rgba(255,255,255,.06), 0 8px 30px -12px rgba(0,0,0,.5);
  padding: .6rem 0;
}
.navbar-brand { display: inline-flex; align-items: center; gap: .6rem; font-family: var(--font-display); font-weight: 800; font-size: 1.2rem; color: #fff; letter-spacing: -.02em; }
.navbar-brand img { width: 34px; height: 34px; }
.navbar-brand:hover { color: #fff; }
.navbar-brand .dot { color: var(--aqua-400); }

.navbar .nav-link {
  color: rgba(255,255,255,.78);
  font-weight: 600; font-size: .95rem;
  padding: .5rem .95rem !important;
  border-radius: 100px;
  transition: color .2s var(--ease), background .2s var(--ease);
}
.navbar .nav-link:hover, .navbar .nav-link:focus { color: #fff; background: rgba(255,255,255,.07); }
.navbar-toggler { border: none; color: #fff; padding: .4rem; }
.navbar-toggler:focus { box-shadow: none; }
.navbar-toggler i { font-size: 1.5rem; }

@media (max-width: 991.98px){
  .navbar-collapse {
    background: rgba(10,16,36,.97);
    backdrop-filter: blur(12px);
    margin-top: 1rem; padding: 1rem; border-radius: var(--radius);
    border: 1px solid rgba(255,255,255,.08);
  }
  .navbar .nav-link { padding: .7rem .95rem !important; }
  .navbar .navbar-nav .btn { margin-top: .6rem; width: 100%; justify-content: center; }
}

/* ---------- 6. Hero ---------- */
.hero {
  position: relative;
  background: radial-gradient(1200px 700px at 78% -10%, rgba(16,203,178,.16), transparent 55%),
              radial-gradient(900px 600px at 12% 8%, rgba(37,99,235,.20), transparent 55%),
              linear-gradient(180deg, #070d1e 0%, #0a1024 55%, #0b1226 100%);
  color: var(--slate-200);
  overflow: hidden;
  padding-top: 8.5rem;
  padding-bottom: 5rem;
}
.hero__grid {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.035) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse 90% 65% at 50% 0%, #000 40%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse 90% 65% at 50% 0%, #000 40%, transparent 75%);
  pointer-events: none;
}
.hero__glow {
  position: absolute; width: 620px; height: 620px; border-radius: 50%;
  filter: blur(90px); opacity: .5; pointer-events: none;
}
.hero__glow--1 { background: rgba(16,203,178,.45); top: -180px; right: -120px; animation: float 9s ease-in-out infinite; }
.hero__glow--2 { background: rgba(37,99,235,.4); bottom: -240px; left: -160px; animation: float 11s ease-in-out infinite reverse; }

.hero h1 { color: #fff; font-size: clamp(2.3rem, 5vw, 4rem); margin-bottom: 1.4rem; }
.hero h1 .stroke { position: relative; white-space: nowrap; }
.hero p.sub { font-size: clamp(1.05rem, 1.7vw, 1.28rem); color: #b9c4d8; max-width: 40ch; }
.hero .risk-list { list-style: none; padding: 0; margin: 1.6rem 0 2rem; display: grid; gap: .55rem; }
.hero .risk-list li { display: flex; align-items: center; gap: .7rem; color: #cfd8e8; font-weight: 500; }
.hero .risk-list i { color: var(--danger-500); font-size: 1.05rem; width: 1.2rem; text-align: center; }

.hero__trust { margin-top: 2.4rem; display: flex; flex-wrap: wrap; gap: 1.4rem 2rem; align-items: center; color: #8ea0bd; font-size: .9rem; }
.hero__trust b { color: #fff; }
.hero__trust .sep { width: 1px; height: 26px; background: rgba(255,255,255,.14); }

/* Hero visual card */
.hero-visual { position: relative; }
.hero-visual svg { width: 100%; height: auto; filter: drop-shadow(0 30px 60px rgba(0,0,0,.5)); }

/* ---------- 7. Cards genéricos ---------- */
.card-soft {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  height: 100%;
  transition: transform .35s var(--ease), box-shadow .35s var(--ease), border-color .35s var(--ease);
  position: relative;
  overflow: hidden;
}
.card-soft:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); border-color: rgba(16,203,178,.35); }
.card-soft .icon-badge { margin-bottom: 1.2rem; }

.icon-badge {
  width: 56px; height: 56px; border-radius: 15px;
  display: inline-flex; align-items: center; justify-content: center;
  font-size: 1.4rem; color: #fff;
  background: var(--gradient-brand);
  box-shadow: 0 10px 24px -8px rgba(16,203,178,.6);
}
.icon-badge--danger { background: linear-gradient(135deg,#ff6b6b,#ef4444); box-shadow: 0 10px 24px -8px rgba(239,68,68,.55); }
.icon-badge--blue   { background: linear-gradient(135deg,var(--blue-400),var(--blue-600)); box-shadow: 0 10px 24px -8px rgba(37,99,235,.5); }
.icon-badge--soft {
  background: var(--gradient-brand-soft); color: var(--aqua-600);
  box-shadow: none; border: 1px solid rgba(16,203,178,.2);
}

.card-soft h3 { font-size: 1.2rem; margin-bottom: .6rem; }
.card-soft p { color: var(--text-muted); margin: 0; font-size: .975rem; }

/* Problem cards (dark accent) */
.problem-card { border-left: 3px solid var(--danger-500); }
.problem-card:hover { border-color: var(--border); border-left-color: var(--danger-500); }

/* ---------- 8. Stats ---------- */
.stat-row { display: grid; grid-template-columns: repeat(4,1fr); gap: 1.5rem; }
@media (max-width: 767px){ .stat-row { grid-template-columns: repeat(2,1fr); } }
.stat {
  text-align: center; padding: 1.6rem 1rem;
  border-radius: var(--radius); background: rgba(255,255,255,.04);
  border: 1px solid rgba(255,255,255,.08);
}
.stat .num { font-family: var(--font-display); font-weight: 800; font-size: clamp(1.9rem,4vw,2.8rem); color: #fff; line-height: 1; }
.stat .num .text-gradient { display: inline; }
.stat .lbl { color: #9fb0c9; font-size: .92rem; margin-top: .5rem; }

/* ---------- 9. Solução (split) ---------- */
.solution-visual {
  background: linear-gradient(160deg,#0c1730 0%,#0a1024 100%);
  border-radius: var(--radius-lg);
}
.check-list { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: 1fr 1fr; gap: .9rem 1.4rem; }
@media (max-width: 575px){ .check-list { grid-template-columns: 1fr; } }
.check-list li { display: flex; align-items: flex-start; gap: .7rem; font-weight: 600; color: var(--slate-900); }
.check-list li i {
  color: var(--safe-500); margin-top: .2rem; font-size: .95rem;
  background: rgba(22,185,129,.12); width: 22px; height: 22px; min-width: 22px;
  display: inline-flex; align-items: center; justify-content: center; border-radius: 50%;
}

/* ---------- 10. Recursos (grid) ---------- */
.feature-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 1rem; }
@media (max-width: 991px){ .feature-grid { grid-template-columns: repeat(2,1fr); } }
@media (max-width: 575px){ .feature-grid { grid-template-columns: 1fr; } }
.feature-item {
  display: flex; gap: 1rem; align-items: flex-start;
  padding: 1.35rem; border-radius: var(--radius);
  background: var(--white); border: 1px solid var(--border);
  transition: transform .3s var(--ease), box-shadow .3s var(--ease), border-color .3s var(--ease);
}
.feature-item:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); border-color: rgba(16,203,178,.3); }
.feature-item .fi-icon {
  width: 44px; height: 44px; min-width: 44px; border-radius: 12px;
  display: inline-flex; align-items: center; justify-content: center;
  background: var(--gradient-brand-soft); color: var(--aqua-600); font-size: 1.15rem;
  border: 1px solid rgba(16,203,178,.18);
}
.feature-item h4 { font-size: 1.02rem; margin: 0 0 .25rem; }
.feature-item p { margin: 0; font-size: .9rem; color: var(--text-muted); }

/* ---------- 11. Como funciona (steps) ---------- */
.steps { display: grid; grid-template-columns: repeat(4,1fr); gap: 1.4rem; counter-reset: step; }
@media (max-width: 991px){ .steps { grid-template-columns: repeat(2,1fr); } }
@media (max-width: 575px){ .steps { grid-template-columns: 1fr; } }
.step { position: relative; padding: 2rem 1.5rem; border-radius: var(--radius-lg); background: var(--white); border: 1px solid var(--border); text-align: center; }
.step__num {
  width: 60px; height: 60px; margin: 0 auto 1.1rem; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-display); font-weight: 800; font-size: 1.4rem; color: #04121f;
  background: var(--gradient-brand); box-shadow: 0 10px 24px -8px rgba(16,203,178,.6);
}
.step h3 { font-size: 1.15rem; margin-bottom: .5rem; }
.step p { color: var(--text-muted); margin: 0; font-size: .93rem; }
.step__icon { position: absolute; top: 1.1rem; right: 1.2rem; color: var(--slate-200); font-size: 1.5rem; }

/* linha conectora (desktop) */
@media (min-width: 992px){
  .steps { position: relative; }
  .steps::before {
    content: ''; position: absolute; top: 90px; left: 12%; right: 12%; height: 2px;
    background: repeating-linear-gradient(90deg, rgba(16,203,178,.4) 0 10px, transparent 10px 20px);
    z-index: 0;
  }
  .step { z-index: 1; }
}

/* ---------- 12. Benefícios ---------- */
.benefit { display: flex; gap: 1.1rem; align-items: flex-start; }
.benefit .b-icon {
  width: 50px; height: 50px; min-width: 50px; border-radius: 14px;
  display: inline-flex; align-items: center; justify-content: center;
  font-size: 1.25rem; color: var(--aqua-600); background: var(--gradient-brand-soft);
  border: 1px solid rgba(16,203,178,.2);
}
.benefit h4 { font-size: 1.08rem; margin: 0 0 .3rem; }
.benefit p { margin: 0; color: var(--text-muted); font-size: .95rem; }

/* ---------- 13. Planos ---------- */
.pricing-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 1.5rem; align-items: stretch; }
@media (max-width: 991px){ .pricing-grid { grid-template-columns: 1fr; max-width: 460px; margin: 0 auto; } }
.plan {
  background: var(--white); border: 1px solid var(--border); border-radius: var(--radius-lg);
  padding: 2.2rem 2rem; display: flex; flex-direction: column; position: relative;
  transition: transform .3s var(--ease), box-shadow .3s var(--ease);
}
.plan:hover { transform: translateY(-5px); box-shadow: var(--shadow-lg); }
.plan--featured {
  background: linear-gradient(180deg,#0b1328,#0a1024);
  border: 1px solid rgba(16,203,178,.35);
  box-shadow: var(--shadow-glow);
  color: var(--slate-200);
}
.plan--featured h3, .plan--featured .price { color: #fff; }
.plan--featured .plan__feat li { color: #cdd8ea; }
.plan__badge {
  position: absolute; top: -13px; left: 50%; transform: translateX(-50%);
  background: var(--gradient-brand); color: #04121f; font-family: var(--font-display);
  font-weight: 700; font-size: .75rem; letter-spacing: .05em; text-transform: uppercase;
  padding: .35rem 1rem; border-radius: 100px;
}
.plan h3 { font-size: 1.3rem; margin-bottom: .3rem; }
.plan__desc { font-size: .92rem; color: var(--text-muted); min-height: 2.6em; }
.plan--featured .plan__desc { color: #9fb0c9; }
.price { font-family: var(--font-display); font-weight: 800; font-size: 2.6rem; letter-spacing: -.03em; margin: 1rem 0 .2rem; }
.price small { font-size: .95rem; font-weight: 500; color: var(--text-muted); }
.plan__feat { list-style: none; padding: 0; margin: 1.4rem 0; display: grid; gap: .7rem; flex: 1; }
.plan__feat li { display: flex; gap: .6rem; align-items: flex-start; font-size: .93rem; color: var(--slate-700); }
.plan__feat li i { color: var(--safe-500); margin-top: .25rem; }
.plan--featured .plan__feat li i { color: var(--aqua-400); }

/* ---------- 14. FAQ ---------- */
.faq-accordion .accordion-item { border: 1px solid var(--border); border-radius: var(--radius) !important; margin-bottom: .85rem; overflow: hidden; background: var(--white); }
.faq-accordion .accordion-button {
  font-family: var(--font-display); font-weight: 600; font-size: 1.05rem; color: var(--slate-900);
  padding: 1.25rem 1.4rem; background: var(--white);
}
.faq-accordion .accordion-button:not(.collapsed) { color: var(--aqua-600); background: rgba(16,203,178,.04); box-shadow: none; }
.faq-accordion .accordion-button:focus { box-shadow: none; border: none; }
.faq-accordion .accordion-button::after {
  background-image: none; content: '\2b'; font-family: 'Font Awesome 6 Free'; font-weight: 900;
  font-size: .85rem; color: var(--aqua-600); width: auto; height: auto; transition: transform .3s var(--ease);
}
.faq-accordion .accordion-button:not(.collapsed)::after { content: '\f068'; transform: none; }
.faq-accordion .accordion-body { padding: 0 1.4rem 1.35rem; color: var(--text-muted); font-size: .98rem; }

/* ---------- 15. CTA final ---------- */
.cta-band {
  position: relative; overflow: hidden;
  background: radial-gradient(800px 400px at 80% 0%, rgba(16,203,178,.22), transparent 60%),
              radial-gradient(700px 400px at 10% 100%, rgba(37,99,235,.25), transparent 60%),
              linear-gradient(135deg,#0a1024,#0c1730);
  border-radius: var(--radius-xl);
  padding: clamp(2.5rem,6vw,4.5rem);
  text-align: center;
  border: 1px solid rgba(255,255,255,.08);
}
.cta-band h2 { color: #fff; font-size: clamp(1.8rem,3.6vw,2.8rem); }
.cta-band p { color: #b9c4d8; font-size: 1.15rem; max-width: 620px; margin: 1rem auto 2rem; }

/* ---------- 16. Rodapé ---------- */
.footer { background: var(--ink-900); color: #9fb0c9; padding-top: 4.5rem; }
.footer a { color: #9fb0c9; font-size: .95rem; }
.footer a:hover { color: var(--aqua-300); }
.footer .navbar-brand { color: #fff; }
.footer h5 { color: #fff; font-family: var(--font-display); font-size: .95rem; letter-spacing: .04em; text-transform: uppercase; margin-bottom: 1.1rem; }
.footer ul { list-style: none; padding: 0; margin: 0; display: grid; gap: .6rem; }
.footer .social { display: flex; gap: .7rem; margin-top: 1.2rem; }
.footer .social a {
  width: 42px; height: 42px; border-radius: 12px; display: inline-flex; align-items: center; justify-content: center;
  background: rgba(255,255,255,.05); border: 1px solid rgba(255,255,255,.09); color: #cbd5e1; font-size: 1.05rem;
  transition: all .25s var(--ease);
}
.footer .social a:hover { background: var(--gradient-brand); color: #04121f; border-color: transparent; transform: translateY(-3px); }
.footer__bottom { border-top: 1px solid rgba(255,255,255,.08); margin-top: 3rem; padding: 1.6rem 0; color: #6b7c96; font-size: .88rem; }

/* ---------- 17. Reveal (scroll) ---------- */
[data-reveal] { opacity: 0; transform: translateY(28px); transition: opacity .7s var(--ease), transform .7s var(--ease); }
[data-reveal].in { opacity: 1; transform: none; }
[data-reveal-delay="1"] { transition-delay: .08s; }
[data-reveal-delay="2"] { transition-delay: .16s; }
[data-reveal-delay="3"] { transition-delay: .24s; }
[data-reveal-delay="4"] { transition-delay: .32s; }
[data-reveal-delay="5"] { transition-delay: .40s; }

/* ---------- 18. Animações ---------- */
@keyframes float { 0%,100%{ transform: translateY(0); } 50%{ transform: translateY(-24px); } }
@keyframes pulse-ring { 0%{ transform: scale(.9); opacity:.7; } 70%{ transform: scale(1.25); opacity:0; } 100%{ opacity:0; } }
@keyframes dash { to { stroke-dashoffset: 0; } }
@keyframes spin-slow { to { transform: rotate(360deg); } }

/* Back to top */
.to-top {
  position: fixed; right: 22px; bottom: 22px; z-index: 60;
  width: 48px; height: 48px; border-radius: 50%; border: none;
  background: var(--gradient-brand); color: #04121f; font-size: 1.1rem;
  box-shadow: 0 12px 30px -8px rgba(16,203,178,.6);
  opacity: 0; pointer-events: none; transform: translateY(12px);
  transition: opacity .3s var(--ease), transform .3s var(--ease);
  cursor: pointer;
}
.to-top.show { opacity: 1; pointer-events: auto; transform: none; }

/* Skip link (a11y) */
.skip-link {
  position: absolute; left: -999px; top: 0; z-index: 200;
  background: #fff; color: var(--slate-900); padding: .7rem 1.1rem; border-radius: 0 0 10px 0; font-weight: 700;
}
.skip-link:focus { left: 0; }

/* Foco visível (a11y) */
a:focus-visible, button:focus-visible, .btn:focus-visible, .nav-link:focus-visible, .accordion-button:focus-visible {
  outline: 3px solid var(--aqua-400); outline-offset: 2px; border-radius: 6px;
}