/* ==========================================================================
   BRILLO TOTAL — Sistema visual
   CSS puro, sin frameworks. Variables en :root, mobile-first con refuerzos
   de escritorio vía min-width media queries.
   ========================================================================== */

/* ---------- Fuentes autohospedadas (variable fonts) ---------- */
@font-face {
  font-family: "Space Grotesk";
  src: url("../assets/fonts/space-grotesk-variable.woff2") format("woff2-variations"),
       url("../assets/fonts/space-grotesk-variable.woff2") format("woff2");
  font-weight: 400 700;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "Inter";
  src: url("../assets/fonts/inter-variable.woff2") format("woff2-variations"),
       url("../assets/fonts/inter-variable.woff2") format("woff2");
  font-weight: 300 800;
  font-style: normal;
  font-display: swap;
}

/* ---------- Tokens ---------- */
:root{
  /* Paleta heredada del logo original, evolucionada */
  --navy-950:#050f24;
  --navy-900:#0a1d3f;
  --navy-800:#0f2a57;
  --navy-700:#153a72;
  --blue-600:#0f7fc4;
  --blue-500:#1596e0;
  --blue-400:#3bb7ea;
  --blue-300:#8ed7f2;
  --green-600:#2f8f2a;
  --green-500:#4caf1f;
  --green-400:#8bc53f;
  --ink-900:#0a0e14;
  --ink-700:#333c47;
  --ink-500:#5b6472;
  --ink-300:#9aa4b1;
  --surface-0:#ffffff;
  --surface-1:#f5f8f9;
  --surface-2:#e9eef1;
  --line:#dfe6ea;

  --font-display:"Space Grotesk", "Segoe UI", Arial, sans-serif;
  --font-body:"Inter", "Segoe UI", Arial, sans-serif;

  --container:1280px;
  --radius-sm:6px;
  --radius-md:14px;
  --radius-lg:28px;

  --space-1:.5rem;
  --space-2:1rem;
  --space-3:1.5rem;
  --space-4:2.5rem;
  --space-5:3rem;
  --space-6:4.5rem;

  --ease-out:cubic-bezier(.16,1,.3,1);
  --ease-soft:cubic-bezier(.4,0,.2,1);
  --dur-1:.25s;
  --dur-2:.5s;
  --dur-3:.9s;

  --header-h:76px;
}

/* ---------- Reset ---------- */
*,*::before,*::after{ box-sizing:border-box; }
html{ scroll-behavior:smooth; }
body{
  margin:0;
  font-family:var(--font-body);
  color:var(--ink-900);
  background:var(--surface-0);
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  overflow-x:hidden;
}
img{ max-width:100%; display:block; height:auto; }
ul,ol{ margin:0; padding:0; list-style:none; }
a{ color:inherit; text-decoration:none; }
button{ font:inherit; color:inherit; background:none; border:0; cursor:pointer; }
input,select,textarea{ font:inherit; color:inherit; }
h1,h2,h3,h4{ font-family:var(--font-display); margin:0; line-height:1.08; font-weight:700; }
p{ margin:0; }
svg{ display:block; }

.bt-sprite{ position:absolute; width:0; height:0; overflow:hidden; }
.bt-icon{ width:1.15em; height:1.15em; flex:none; }

@media (prefers-reduced-motion: reduce){
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
    transition-delay:0ms !important;
    scroll-behavior:auto !important;
  }
}

/* ---------- Barra de progreso de scroll ---------- */
.bt-progress{
  position:fixed; top:0; left:0; width:100%; height:3px; z-index:1000;
  background:rgba(255,255,255,.08);
}
.bt-progress span{
  display:block; height:100%; width:0%;
  background:linear-gradient(90deg, var(--blue-400), var(--green-500));
  box-shadow:0 0 12px rgba(59,183,234,.65);
}

/* ---------- Accesibilidad ---------- */
.bt-skip{
  position:absolute; left:0; top:-100%;
  background:var(--navy-900); color:#fff;
  padding:.9rem 1.4rem; z-index:1000;
  transition:top var(--dur-1) var(--ease-soft);
  border-radius:0 0 var(--radius-sm) 0;
}
.bt-skip:focus{ top:0; }

:focus-visible{ outline:3px solid var(--blue-400); outline-offset:2px; border-radius:4px; }

/* ---------- Layout helpers ---------- */
.bt-eyebrow{
  font-family:var(--font-display);
  font-weight:600;
  font-size:.8rem;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--green-600);
  margin:0 0 .9rem;
  display:inline-flex; align-items:center; gap:.55rem;
}
.bt-eyebrow::before{
  content:""; width:6px; height:6px; border-radius:50%; flex:none;
  background:currentColor;
  animation:bt-pulse-dot 2.4s ease-out infinite;
}
@keyframes bt-pulse-dot{
  0%{ box-shadow:0 0 0 0 rgba(76,175,31,.55); }
  70%{ box-shadow:0 0 0 9px rgba(76,175,31,0); }
  100%{ box-shadow:0 0 0 0 rgba(76,175,31,0); }
}
.bt-section-head{
  max-width:760px;
  margin:0 auto var(--space-5);
  padding:0 var(--space-3);
  text-align:left;
}
.bt-section-head h2{ font-size:clamp(1.8rem,3.4vw + 1rem,2.9rem); }
.bt-section-lead{ margin-top:1rem; color:var(--ink-500); font-size:1.05rem; max-width:56ch; }
.bt-section-head--light .bt-eyebrow{ color:var(--blue-300); }
.bt-section-head--light h2,
.bt-section-head--light .bt-section-lead{ color:#fff; }
.bt-section-head--light .bt-section-lead{ color:rgba(255,255,255,.72); }

/* ---------- Botones ---------- */
.bt-btn{
  display:inline-flex; align-items:center; justify-content:center; gap:.6rem;
  padding:.9rem 1.5rem;
  border-radius:100px;
  font-weight:600;
  font-size:.98rem;
  white-space:nowrap;
  transition:transform var(--dur-1) var(--ease-soft), box-shadow var(--dur-1) var(--ease-soft), background var(--dur-1) var(--ease-soft), color var(--dur-1) var(--ease-soft);
  position:relative;
  overflow:hidden;
  will-change:transform;
}
.bt-btn::before{
  content:""; position:absolute; inset:0; z-index:0;
  background:linear-gradient(115deg, transparent 30%, rgba(255,255,255,.4) 50%, transparent 70%);
  transform:translateX(-130%);
  transition:transform .75s var(--ease-out);
  pointer-events:none;
}
.bt-btn:hover::before{ transform:translateX(130%); }
.bt-btn span, .bt-btn > .bt-icon{ position:relative; z-index:1; }
.bt-btn--primary{ background:var(--green-500); color:#fff; box-shadow:0 10px 24px -8px rgba(76,175,31,.55); }
.bt-btn--primary:hover{ background:var(--green-600); transform:translateY(-2px); box-shadow:0 16px 30px -10px rgba(76,175,31,.6); }
.bt-btn--outline{ border:1.5px solid rgba(255,255,255,.4); color:#fff; }
.bt-btn--outline:hover{ background:rgba(255,255,255,.1); transform:translateY(-2px); }
.bt-btn--ghost{ border:1.5px solid var(--line); color:var(--ink-700); }
.bt-btn--ghost:hover{ border-color:var(--blue-500); color:var(--blue-600); }
.bt-btn--sm{ padding:.6rem 1.1rem; font-size:.88rem; }
.bt-btn--lg{ padding:1.05rem 1.9rem; font-size:1.02rem; }
.bt-btn--block{ width:100%; }
.bt-btn .bt-icon{ transition:transform var(--dur-1) var(--ease-soft); }
.bt-btn:hover .bt-icon{ transform:translateX(3px); }

.bt-link-cta{
  display:inline-flex; align-items:center; gap:.5rem;
  font-weight:600; color:var(--blue-600);
  margin-top:1.4rem; position:relative;
}
.bt-link-cta::after{
  content:""; position:absolute; left:0; bottom:-3px; height:2px; width:100%;
  background:currentColor; transform:scaleX(0); transform-origin:right;
  transition:transform var(--dur-2) var(--ease-out);
}
.bt-link-cta:hover::after{ transform:scaleX(1); transform-origin:left; }
.bt-link-cta .bt-icon{ transition:transform var(--dur-1) var(--ease-soft); }
.bt-link-cta:hover .bt-icon{ transform:translateX(4px); }

/* ---------- Efecto "futurista" para secciones oscuras: grilla + spotlight que sigue el cursor ---------- */
.bt-dark-fx{ position:relative; isolation:isolate; }
.bt-dark-fx::before{
  content:""; position:absolute; inset:0; z-index:0; pointer-events:none;
  background-image:
    linear-gradient(rgba(255,255,255,.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.045) 1px, transparent 1px);
  background-size:56px 56px;
  mask-image:radial-gradient(ellipse at 50% 15%, black, transparent 75%);
}
.bt-dark-fx::after{
  content:""; position:absolute; inset:0; z-index:0; pointer-events:none;
  background:radial-gradient(480px circle at var(--gx,50%) var(--gy,20%), rgba(59,183,234,.16), transparent 70%);
  opacity:0; transition:opacity .5s var(--ease-soft);
}
.bt-dark-fx:hover::after{ opacity:1; }
.bt-dark-fx > *{ position:relative; z-index:1; }

.bt-check-list{ display:grid; gap:.8rem; margin-top:1.4rem; }
.bt-check-list li{ display:flex; align-items:flex-start; gap:.7rem; color:var(--ink-700); }
.bt-check-list .bt-icon{ color:var(--green-600); margin-top:.15rem; flex:none; }
.bt-check-list--light li{ color:rgba(255,255,255,.85); }
.bt-check-list--light .bt-icon{ color:var(--green-400); }

/* ==========================================================================
   HEADER
   ========================================================================== */
.bt-header{
  position:fixed; inset:0 0 auto 0; z-index:500;
  height:var(--header-h);
  transition:transform var(--dur-2) var(--ease-soft), background var(--dur-2) var(--ease-soft), box-shadow var(--dur-2) var(--ease-soft);
}
.bt-header::before{
  content:""; position:absolute; inset:0;
  background:rgba(5,15,36,.0);
  backdrop-filter:blur(0px);
  transition:background var(--dur-2) var(--ease-soft), backdrop-filter var(--dur-2) var(--ease-soft);
  z-index:-1;
}
.bt-header.is-solid::before{ background:rgba(6,17,41,.86); backdrop-filter:blur(14px); box-shadow:0 8px 30px -14px rgba(0,0,0,.4); }
.bt-header.is-hidden{ transform:translateY(-100%); }

.bt-header__bar{
  max-width:var(--container); margin:0 auto; height:100%;
  padding:0 var(--space-3);
  display:flex; align-items:center; justify-content:space-between; gap:var(--space-3);
}
.bt-logo{ display:inline-flex; align-items:center; flex:none; }
.bt-logo__img{ height:38px; width:auto; filter:drop-shadow(0 2px 6px rgba(0,0,0,.25)); }

.bt-nav__list{ display:none; }
.bt-header__actions{ display:flex; align-items:center; gap:.6rem; }
.bt-header__actions .bt-btn--ghost{ display:none; }

.bt-burger{
  width:44px; height:44px; display:flex; align-items:center; justify-content:center;
  border-radius:50%; color:#fff; transition:background var(--dur-1);
}
.bt-burger:hover{ background:rgba(255,255,255,.12); }

/* Menú mobile fullscreen */
.bt-mobile{
  position:fixed; top:0; right:0; height:100%; width:min(88vw,380px);
  background:var(--navy-950); color:#fff; z-index:900;
  padding:var(--space-3);
  display:flex; flex-direction:column; gap:var(--space-4);
  transform:translateX(100%);
  transition:transform var(--dur-3) var(--ease-out);
}
.bt-mobile.is-open{ transform:translateX(0); }
.bt-mobile__head{ display:flex; align-items:center; justify-content:space-between; }
.bt-mobile__brand{ font-family:var(--font-display); font-weight:700; font-size:1.1rem; }
.bt-mobile__list{ display:flex; flex-direction:column; gap:.2rem; }
.bt-mobile__list a{
  display:block; padding:.85rem 0; font-size:1.2rem; font-family:var(--font-display); font-weight:600;
  border-bottom:1px solid rgba(255,255,255,.08);
  opacity:0; transform:translateY(14px);
  transition:opacity .5s var(--ease-out), transform .5s var(--ease-out);
}
.bt-mobile.is-open .bt-mobile__list a{ opacity:1; transform:none; }
.bt-mobile.is-open .bt-mobile__list li:nth-child(1) a{ transition-delay:.05s; }
.bt-mobile.is-open .bt-mobile__list li:nth-child(2) a{ transition-delay:.1s; }
.bt-mobile.is-open .bt-mobile__list li:nth-child(3) a{ transition-delay:.15s; }
.bt-mobile.is-open .bt-mobile__list li:nth-child(4) a{ transition-delay:.2s; }
.bt-mobile.is-open .bt-mobile__list li:nth-child(5) a{ transition-delay:.25s; }
.bt-mobile.is-open .bt-mobile__list li:nth-child(6) a{ transition-delay:.3s; }
.bt-mobile.is-open .bt-mobile__list li:nth-child(7) a{ transition-delay:.35s; }
.bt-mobile__overlay{
  position:fixed; inset:0; background:rgba(4,10,24,.6); z-index:800;
  opacity:0; visibility:hidden; transition:opacity var(--dur-2) var(--ease-soft);
}
.bt-mobile__overlay.is-open{ opacity:1; visibility:visible; }

/* ==========================================================================
   HERO
   ========================================================================== */
.bt-hero{
  position:relative;
  background:var(--navy-950);
  color:#fff;
  padding:calc(var(--header-h) + var(--space-4)) 0 0;
  overflow:hidden;
}
.bt-hero__bg{ position:absolute; inset:0; z-index:0; }
.bt-hero__grid{
  position:absolute; inset:-2px;
  background-image:
    linear-gradient(rgba(255,255,255,.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.05) 1px, transparent 1px);
  background-size:64px 64px;
  mask-image:radial-gradient(ellipse at 30% 20%, black, transparent 70%);
}
.bt-hero__glow{ position:absolute; border-radius:50%; filter:blur(90px); opacity:.35; }
.bt-hero__glow--a{ width:520px; height:520px; background:var(--blue-500); top:-160px; left:-120px; animation:bt-float 12s ease-in-out infinite; }
.bt-hero__glow--b{ width:420px; height:420px; background:var(--green-500); bottom:-140px; right:-100px; animation:bt-float 14s ease-in-out infinite reverse; }
@keyframes bt-float{ 0%,100%{ transform:translate(0,0);} 50%{ transform:translate(30px,-20px);} }

.bt-hero__inner{
  position:relative; z-index:1;
  max-width:var(--container); margin:0 auto; padding:0 var(--space-3);
  display:grid; gap:var(--space-5);
}
.bt-hero__title{ font-size:clamp(2.1rem,5vw + 1rem,3.6rem); letter-spacing:-.01em; }
.bt-hero__lead{ margin-top:1.3rem; font-size:1.1rem; color:rgba(255,255,255,.75); max-width:52ch; }
.bt-hero__cta{ display:flex; flex-wrap:wrap; gap:.9rem; margin-top:2.2rem; }

.bt-hero__visual{ position:relative; max-width:420px; margin:0 auto; }
.bt-hero__frame{
  position:relative; border-radius:var(--radius-lg); overflow:hidden;
  clip-path:polygon(0 6%,94% 0,100% 92%,6% 100%);
  box-shadow:0 40px 60px -30px rgba(0,0,0,.6);
}
.bt-hero__img{ aspect-ratio:1/1; object-fit:cover; }
.bt-hero__scan{
  position:absolute; left:0; right:0; height:36%;
  background:linear-gradient(180deg, rgba(59,183,234,0) 0%, rgba(59,183,234,.35) 50%, rgba(59,183,234,0) 100%);
  top:-40%;
  animation:bt-scan 4.5s ease-in-out infinite;
}
@keyframes bt-scan{ 0%{ top:-40%; } 60%{ top:104%; } 100%{ top:104%; } }
.bt-hero__badge{
  position:absolute; left:-1.2rem; bottom:-1.4rem;
  background:#fff; color:var(--navy-950);
  border-radius:var(--radius-md);
  padding:1rem 1.2rem;
  display:flex; flex-direction:column; gap:.15rem;
  max-width:220px;
  box-shadow:0 20px 40px -18px rgba(0,0,0,.45);
}
.bt-hero__badge-num{ font-family:var(--font-display); font-weight:700; font-size:1.5rem; color:var(--green-600); }
.bt-hero__badge-txt{ font-size:.82rem; color:var(--ink-500); line-height:1.3; }

.bt-hero__strip{
  position:relative; z-index:1; margin-top:var(--space-5);
  border-top:1px solid rgba(255,255,255,.12);
  background:rgba(255,255,255,.03);
  padding:var(--space-3);
  display:grid; gap:1rem;
}
.bt-hero__strip-item{ display:flex; align-items:center; gap:.7rem; font-size:.92rem; color:rgba(255,255,255,.82); }
.bt-hero__strip-item .bt-icon{ color:var(--blue-300); flex:none; }

/* ==========================================================================
   ALTURA
   ========================================================================== */
.bt-altura{
  background:var(--surface-1);
  padding:var(--space-6) var(--space-3);
  display:grid; gap:var(--space-5);
  max-width:var(--container); margin:0 auto;
}
.bt-altura__visual{ position:relative; }
.bt-altura__visual img{
  border-radius:var(--radius-lg);
  aspect-ratio:1/1; object-fit:cover;
  clip-path:polygon(0 0,100% 4%,100% 100%,0 96%);
}
.bt-altura__line{
  position:absolute; left:-14px; top:8%; bottom:8%; width:3px;
  background:linear-gradient(var(--green-500), var(--blue-500));
  border-radius:3px;
}
.bt-altura__copy h2{ font-size:clamp(1.8rem,3.2vw + 1rem,2.7rem); margin-bottom:1.1rem; }
.bt-altura__copy p{ color:var(--ink-500); font-size:1.05rem; max-width:56ch; }
.bt-altura__list{ display:grid; gap:.9rem; margin:1.6rem 0 1.8rem; }
.bt-altura__list li{ display:flex; align-items:center; gap:.7rem; font-weight:600; color:var(--ink-700); }
.bt-altura__list li:nth-child(1){ transition-delay:0s; }
.bt-altura__list li:nth-child(2){ transition-delay:.08s; }
.bt-altura__list li:nth-child(3){ transition-delay:.16s; }
.bt-altura__list .bt-icon{ color:var(--blue-600); }

/* ==========================================================================
   SERVICIOS (panel/dashboard)
   ========================================================================== */
.bt-servicios{ padding:var(--space-6) 0; max-width:var(--container); margin:0 auto; }
.bt-panel{ padding:0 var(--space-3); }
.bt-panel__tabs{
  display:grid; gap:.6rem;
  margin-bottom:1.2rem;
}
.bt-panel__tab{
  display:flex; align-items:center; gap:.7rem;
  padding:1rem 1.2rem;
  border:1.5px solid var(--line);
  border-radius:var(--radius-md);
  font-weight:600; color:var(--ink-500);
  text-align:left;
  position:relative; overflow:hidden;
  transition:border-color var(--dur-1), color var(--dur-1), background var(--dur-1), transform var(--dur-1) var(--ease-soft), box-shadow var(--dur-1) var(--ease-soft);
}
.bt-panel__tab::after{
  content:""; position:absolute; left:1.2rem; right:1.2rem; bottom:0; height:2px;
  background:linear-gradient(90deg, var(--blue-400), var(--green-400));
  transform:scaleX(0); transform-origin:left; transition:transform .45s var(--ease-out);
}
.bt-panel__tab:hover{ border-color:var(--blue-400); color:var(--blue-600); transform:translateY(-2px); box-shadow:0 14px 26px -18px rgba(15,127,196,.55); }
.bt-panel__tab .bt-icon{ color:var(--blue-500); transition:transform var(--dur-1) var(--ease-soft); }
.bt-panel__tab:hover .bt-icon{ transform:scale(1.12); }
.bt-panel__tab.is-active{ border-color:var(--navy-900); background:var(--navy-950); color:#fff; box-shadow:0 16px 34px -16px rgba(5,15,36,.6); }
.bt-panel__tab.is-active:hover{ transform:none; }
.bt-panel__tab.is-active .bt-icon{ color:var(--green-400); }
.bt-panel__tab.is-active::after{ transform:scaleX(1); }

.bt-panel__body{ position:relative; }
.bt-panel__pane{ display:grid; gap:var(--space-4); }
.bt-panel__pane[hidden]{ display:none; }
.bt-panel__img{ border-radius:var(--radius-lg); overflow:hidden; aspect-ratio:4/3; }
.bt-panel__img img{ width:100%; height:100%; object-fit:cover; transition:transform .6s var(--ease-out); }
.bt-panel__img:hover img{ transform:scale(1.05); }
.bt-panel__info h3{ font-size:1.5rem; margin-bottom:.6rem; }
.bt-panel__info p{ color:var(--ink-500); }

/* Animación de entrada al cambiar de pestaña */
@keyframes bt-fade-up{ from{ opacity:0; transform:translateY(14px);} to{ opacity:1; transform:none;} }
.bt-panel__pane.is-active{ animation:bt-fade-up .5s var(--ease-out); }

/* ==========================================================================
   NOSOTROS (timeline editorial)
   ========================================================================== */
.bt-nosotros{ padding:var(--space-6) var(--space-3); max-width:var(--container); margin:0 auto; }
.bt-timeline{ position:relative; display:grid; gap:var(--space-4); }
.bt-timeline::before{
  content:""; position:absolute; left:1.35rem; top:0; bottom:0; width:2px;
  background:linear-gradient(var(--line), var(--line));
}
.bt-timeline__item{ position:relative; display:flex; gap:var(--space-3); padding-left:.2rem; }
.bt-timeline__item:nth-child(1){ transition-delay:0s; }
.bt-timeline__item:nth-child(2){ transition-delay:.08s; }
.bt-timeline__item:nth-child(3){ transition-delay:.16s; }
.bt-timeline__item:nth-child(4){ transition-delay:.24s; }
.bt-timeline__num{
  position:relative;
  flex:none; width:2.7rem; height:2.7rem; border-radius:50%;
  background:var(--navy-950); color:var(--green-400);
  display:flex; align-items:center; justify-content:center;
  font-family:var(--font-display); font-weight:700; font-size:.95rem;
  z-index:1;
}
.bt-timeline__num::before{
  content:""; position:absolute; inset:-5px; border-radius:50%;
  border:1.5px solid var(--green-400); opacity:0; transform:scale(.8);
}
.bt-timeline__item.is-visible .bt-timeline__num::before{
  animation:bt-ring-pulse 2s var(--ease-soft) .35s 2;
}
@keyframes bt-ring-pulse{
  0%{ opacity:.65; transform:scale(.8); }
  100%{ opacity:0; transform:scale(1.4); }
}
.bt-timeline__content h3{ font-size:1.3rem; margin-bottom:.5rem; }
.bt-timeline__content p{ color:var(--ink-500); max-width:60ch; }

/* ==========================================================================
   PROCESO
   ========================================================================== */
.bt-proceso{ background:var(--navy-950); color:#fff; padding:var(--space-6) var(--space-3); }
.bt-proceso__line{ max-width:var(--container); margin:0 auto; position:relative; }
.bt-proceso__path{ display:none; }
.bt-proceso__steps{ display:grid; gap:var(--space-4); position:relative; }
.bt-proceso__steps li{
  border-top:2px solid rgba(255,255,255,.14);
  padding-top:1.4rem;
  position:relative;
  transition:border-color var(--dur-2) var(--ease-soft), transform var(--dur-2) var(--ease-soft);
}
.bt-proceso__steps li:nth-child(1){ transition-delay:0s; }
.bt-proceso__steps li:nth-child(2){ transition-delay:.08s; }
.bt-proceso__steps li:nth-child(3){ transition-delay:.16s; }
.bt-proceso__steps li:nth-child(4){ transition-delay:.24s; }
.bt-proceso__steps li:hover{ border-color:var(--blue-400); transform:translateY(-3px); }
.bt-proceso__num{ font-family:var(--font-display); font-weight:700; font-size:1.6rem; color:var(--blue-300); display:inline-block; transition:text-shadow var(--dur-2) var(--ease-soft); }
.bt-proceso__steps li:hover .bt-proceso__num{ text-shadow:0 0 22px rgba(139,215,242,.75); }
.bt-proceso__steps h3{ margin:.6rem 0 .5rem; font-size:1.2rem; }
.bt-proceso__steps p{ color:rgba(255,255,255,.68); font-size:.96rem; }

/* ==========================================================================
   GALERÍA (bento)
   ========================================================================== */
.bt-galeria{ padding:var(--space-6) var(--space-3); max-width:var(--container); margin:0 auto; }
.bt-bento{ display:grid; gap:1rem; grid-template-columns:1fr; }
.bt-bento__item{
  position:relative; margin:0; overflow:hidden; border-radius:var(--radius-md);
  clip-path:inset(0 0 0 0 round var(--radius-md));
  transition:box-shadow .5s var(--ease-soft);
}
.bt-bento__item:nth-child(1){ transition-delay:0s; }
.bt-bento__item:nth-child(2){ transition-delay:.08s; }
.bt-bento__item:nth-child(3){ transition-delay:.16s; }
.bt-bento__item:nth-child(4){ transition-delay:.24s; }
.bt-bento__item::after{
  content:""; position:absolute; inset:0; border-radius:inherit; pointer-events:none;
  box-shadow:inset 0 0 0 0 rgba(59,183,234,0);
  transition:box-shadow .45s var(--ease-soft);
}
.bt-bento__item:hover::after{ box-shadow:inset 0 0 0 2px rgba(59,183,234,.8); }
.bt-bento__item img{ width:100%; height:100%; object-fit:cover; aspect-ratio:4/3; transition:transform .7s var(--ease-out); }
.bt-bento__item:hover img{ transform:scale(1.06); }
.bt-bento__item figcaption{
  position:absolute; left:0; right:0; bottom:0;
  padding:1rem;
  background:linear-gradient(0deg, rgba(5,15,36,.88), transparent);
  color:#fff; font-size:.86rem; font-weight:600;
  transform:translateY(8px); opacity:0;
  transition:transform var(--dur-1) var(--ease-soft), opacity var(--dur-1) var(--ease-soft);
}
.bt-bento__item:hover figcaption, .bt-bento__item:focus-within figcaption{ transform:translateY(0); opacity:1; }

/* ==========================================================================
   TERCERIZACIÓN
   ========================================================================== */
.bt-terceriz{
  background:var(--navy-950); color:#fff;
  padding:var(--space-6) var(--space-3);
  display:grid; gap:var(--space-5);
  max-width:var(--container); margin:0 auto;
}
.bt-terceriz__copy h2{ font-size:clamp(1.8rem,3.2vw + 1rem,2.7rem); margin-bottom:1.1rem; }
.bt-terceriz__copy p{ color:rgba(255,255,255,.72); max-width:56ch; }
.bt-terceriz__visual img{ border-radius:var(--radius-lg); aspect-ratio:1/1; object-fit:cover; }

/* ==========================================================================
   CONTACTO
   ========================================================================== */
.bt-contacto{ background:var(--surface-1); padding:var(--space-6) var(--space-3); }
.bt-contacto__grid{
  max-width:var(--container); margin:0 auto;
  display:grid; gap:var(--space-4);
}
.bt-form{
  display:grid; grid-template-columns:1fr; gap:1.2rem;
  background:#fff; padding:var(--space-4); border-radius:var(--radius-lg);
  box-shadow:0 30px 60px -34px rgba(10,20,40,.25);
}
.bt-field{ position:relative; }
.bt-field--full{ grid-column:1 / -1; }
.bt-field input, .bt-field select, .bt-field textarea{
  width:100%; padding:1rem .9rem .5rem; border:1.5px solid var(--line); border-radius:var(--radius-sm);
  background:#fff; transition:border-color var(--dur-1);
}
.bt-field textarea{ resize:vertical; min-height:6rem; }
.bt-field label{
  position:absolute; left:.9rem; top:.95rem; color:var(--ink-500);
  pointer-events:none; transition:transform var(--dur-1) var(--ease-soft), font-size var(--dur-1), color var(--dur-1);
  transform-origin:left top;
  background:#fff;
  padding:0 .2rem;
}
.bt-field select{ padding-top:1rem; color:var(--ink-900); }
.bt-field select:invalid{ color:var(--ink-500); }

.bt-field input:focus, .bt-field select:focus, .bt-field textarea:focus{ border-color:var(--blue-500); box-shadow:0 0 0 4px rgba(21,150,224,.14); }
.bt-field input:focus + label,
.bt-field input:not(:placeholder-shown) + label,
.bt-field textarea:focus + label,
.bt-field textarea:not(:placeholder-shown) + label{
  transform:translateY(-1.55rem) scale(.82); color:var(--blue-600);
}
.bt-field select{ transform:none; }
.bt-field:has(select:focus) label,
.bt-field select:not([value=""]):valid ~ label{ transform:translateY(-1.55rem) scale(.82); color:var(--blue-600); }

.bt-field.is-invalid input, .bt-field.is-invalid select, .bt-field.is-invalid textarea{ border-color:#c73a3a; }
.bt-field__error{ display:block; min-height:1.1rem; font-size:.78rem; color:#c73a3a; margin-top:.3rem; }

.bt-form__status{ grid-column:1/-1; font-weight:600; min-height:1.4rem; }
.bt-form__status.is-ok{ color:var(--green-600); }
.bt-form__status.is-err{ color:#c73a3a; }

.bt-contacto__info{ background:var(--navy-950); color:#fff; border-radius:var(--radius-lg); padding:var(--space-4); }
.bt-info-list{ display:grid; gap:1.3rem; }
.bt-info-list li{ display:flex; gap:.9rem; align-items:flex-start; }
.bt-info-list .bt-icon{ color:var(--green-400); margin-top:.2rem; }
.bt-info-list strong{ display:block; font-size:.85rem; text-transform:uppercase; letter-spacing:.06em; color:var(--blue-300); margin-bottom:.15rem; }
.bt-info-list a{ text-decoration:underline; text-underline-offset:3px; }
.bt-map-link{
  display:inline-flex; align-items:center; gap:.6rem; margin-top:1.6rem;
  color:#fff; font-weight:600; border-top:1px solid rgba(255,255,255,.15); padding-top:1.4rem; width:100%;
}
.bt-map-link .bt-icon{ color:var(--green-400); }

/* ==========================================================================
   FOOTER
   ========================================================================== */
.bt-footer{ background:var(--navy-950); color:rgba(255,255,255,.75); padding:2rem var(--space-3) .9rem; position:relative; }
.bt-footer::before{
  content:""; position:absolute; inset:0 0 auto 0; height:1px;
  background:linear-gradient(90deg, transparent, var(--blue-400), var(--green-400), transparent);
  opacity:.5;
}
.bt-footer__main{ max-width:var(--container); margin:0 auto; display:grid; gap:1.3rem; text-align:center; justify-items:center; }
.bt-footer__brand{ display:grid; gap:.55rem; justify-items:center; }
.bt-footer__brand p{ max-width:58ch; font-size:.9rem; }
.bt-logo--footer img{ height:28px; width:auto; }
.bt-footer__social{ display:flex; gap:.7rem; }
.bt-footer__social a{
  width:2.3rem; height:2.3rem; border-radius:50%; border:1.5px solid rgba(255,255,255,.2);
  display:flex; align-items:center; justify-content:center; transition:background var(--dur-1), border-color var(--dur-1), transform var(--dur-1) var(--ease-soft);
}
.bt-footer__social a:hover{ background:var(--green-500); border-color:var(--green-500); transform:translateY(-2px); }
.bt-footer__nav ul{ display:flex; flex-wrap:wrap; justify-content:center; gap:.4rem 1.2rem; font-size:.86rem; }
.bt-footer__nav a{ position:relative; padding:.15rem 0; }
.bt-footer__nav a::after{
  content:""; position:absolute; left:0; bottom:0; width:0; height:1px; background:var(--green-400);
  transition:width var(--dur-1) var(--ease-soft);
}
.bt-footer__nav a:hover{ color:#fff; }
.bt-footer__nav a:hover::after{ width:100%; }
.bt-footer__bottom{
  max-width:var(--container); margin:1rem auto 0; padding-top:.75rem;
  border-top:1px solid rgba(255,255,255,.12);
  display:flex; flex-wrap:wrap; gap:.5rem; justify-content:space-between; font-size:.78rem;
}

/* ==========================================================================
   Botón volver arriba
   ========================================================================== */
.bt-top{
  position:fixed; right:1.2rem; bottom:1.2rem; z-index:400;
  width:3rem; height:3rem; border-radius:50%;
  background:var(--navy-950); color:#fff;
  display:flex; align-items:center; justify-content:center;
  box-shadow:0 14px 30px -12px rgba(0,0,0,.4);
  opacity:0; visibility:hidden; transform:translateY(10px);
  transition:opacity var(--dur-1), transform var(--dur-1), visibility var(--dur-1);
}
.bt-top.is-visible{ opacity:1; visibility:visible; transform:none; }

/* ==========================================================================
   Scroll reveal (JS toggles .is-visible via IntersectionObserver)
   ========================================================================== */
[data-reveal], [data-split-reveal]{
  opacity:0; transform:translateY(22px);
  transition:opacity .7s var(--ease-out), transform .7s var(--ease-out);
}
[data-reveal].is-visible, [data-split-reveal].is-visible{ opacity:1; transform:none; }

[data-split-reveal] .bt-split-word{
  display:inline-block; overflow:hidden;
}
[data-split-reveal] .bt-split-word span{
  display:inline-block; transform:translateY(110%); transition:transform .7s var(--ease-out);
}
[data-split-reveal].is-visible .bt-split-word span{ transform:translateY(0); }

@media (prefers-reduced-motion: reduce){
  [data-reveal], [data-split-reveal]{ opacity:1; transform:none; }
  [data-split-reveal] .bt-split-word span{ transform:none; }
}

/* ==========================================================================
   RESPONSIVE — 576px
   ========================================================================== */
@media (min-width:576px){
  .bt-bento{ grid-template-columns:repeat(2,1fr); }
  .bt-bento__item--wide{ grid-column:span 2; }
}

/* ---------- 768px ---------- */
@media (min-width:768px){
  .bt-hero__cta{ flex-wrap:nowrap; }
  .bt-altura{ grid-template-columns:1fr 1fr; align-items:center; }
  .bt-panel__tabs{ grid-template-columns:repeat(3,1fr); }
  .bt-panel__pane{ grid-template-columns:1fr 1fr; align-items:center; }
  .bt-proceso__steps{ grid-template-columns:repeat(2,1fr); }
  .bt-terceriz{ grid-template-columns:1fr 1fr; align-items:center; }
  .bt-contacto__grid{ grid-template-columns:1.4fr 1fr; align-items:start; }
  .bt-form{ grid-template-columns:1fr 1fr; }
  .bt-footer__main{
    grid-template-columns:1.3fr auto; align-items:center;
    text-align:left; justify-items:start;
  }
  .bt-footer__brand{ justify-items:start; }
  .bt-footer__nav ul{ justify-content:flex-end; }
  .bt-footer__bottom{ flex-wrap:nowrap; }
}

/* ---------- 992px ---------- */
@media (min-width:992px){
  :root{ --header-h:84px; }
  .bt-nav__list{ display:flex; gap:1.9rem; }
  .bt-nav__list a{
    font-weight:600; font-size:.95rem; color:rgba(255,255,255,.82);
    position:relative; padding:.3rem 0;
  }
  .bt-header:not(.is-solid) .bt-nav__list a{ color:#fff; }
  .bt-nav__list a::after{
    content:""; position:absolute; left:0; bottom:-2px; width:0; height:2px; background:var(--green-500);
    transition:width var(--dur-1) var(--ease-soft);
  }
  .bt-nav__list a:hover::after{ width:100%; }
  .bt-nav__list a:hover{ color:#fff; }
  .bt-header__actions .bt-btn--ghost{ display:inline-flex; }
  .bt-burger{ display:none; }

  .bt-hero__inner{ grid-template-columns:1.1fr .9fr; align-items:center; }
  .bt-hero__strip{ display:flex; justify-content:space-between; border-radius:var(--radius-md) var(--radius-md) 0 0; margin-inline:var(--space-3); }
  .bt-proceso__steps{ grid-template-columns:repeat(4,1fr); }
}

/* ---------- 1200px ---------- */
@media (min-width:1200px){
  .bt-hero__title{ max-width:16ch; }
  .bt-bento{ grid-template-columns:repeat(4,1fr); }
  .bt-bento__item--tall{ grid-row:span 2; }
  .bt-bento__item--wide{ grid-column:span 2; }
}

/* ---------- 1440px ---------- */
@media (min-width:1440px){
  .bt-section-head{ margin-left:0; }
}