/* =========================================================
   Constructora Vértice — hoja de estilos principal
   Paleta sobria: hormigón, negro, arena y acento ocre.
   ========================================================= */

:root{
  --ink:        #14140f;
  --ink-soft:   #3a3a33;
  --muted:      #6f6f65;
  --line:       rgba(20,20,15,.13);
  --bg:         #ffffff;
  --bg-alt:     #f4f2ed;
  --bg-dark:    #14140f;
  --accent:     #b3803f;
  --accent-2:   #8f6531;

  --font-display: "Archivo", "Segoe UI", system-ui, sans-serif;
  --font-body:    "Inter", "Segoe UI", system-ui, sans-serif;
  --font-serif:   "Instrument Serif", Georgia, serif;

  --container: 1220px;
  --gutter: 24px;
  --radius: 2px;

  --ease: cubic-bezier(.22,.61,.36,1);
}

/* ---------- Reset ---------- */
*,*::before,*::after{ box-sizing:border-box; }
html{ scroll-behavior:smooth; scroll-padding-top:88px; -webkit-text-size-adjust:100%; }
body{
  margin:0;
  background:var(--bg);
  color:var(--ink);
  font-family:var(--font-body);
  font-size:17px;
  font-weight:300;
  line-height:1.72;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img{ max-width:100%; height:auto; display:block; }
a{ color:inherit; text-decoration:none; }
button{ font:inherit; color:inherit; }
ul,ol{ margin:0; padding:0; list-style:none; }
h1,h2,h3,h4{ margin:0; font-family:var(--font-display); font-weight:600; line-height:1.06; letter-spacing:-.03em; }
p{ margin:0 0 1.1em; }
p:last-child{ margin-bottom:0; }
em{ font-family:var(--font-serif); font-style:italic; font-weight:400; letter-spacing:-.01em; }

::selection{ background:var(--ink); color:#fff; }

.skip-link{
  position:absolute; left:-9999px; top:0; z-index:200;
  background:var(--ink); color:#fff; padding:12px 20px;
}
.skip-link:focus{ left:0; }

:focus-visible{ outline:2px solid var(--accent); outline-offset:3px; }

/* ---------- Layout ---------- */
.container{
  width:100%; max-width:var(--container);
  margin-inline:auto; padding-inline:var(--gutter);
}
.section{ padding:120px 0; }
.section--alt{ background:var(--bg-alt); }
.section--dark{ background:var(--bg-dark); color:#e9e7e1; }
.section--dark .h2,
.section--dark h3{ color:#fff; }
.section--dark .lead{ color:#b7b4ab; }

.section__head{ max-width:720px; margin-bottom:64px; }
.section__head--row{
  max-width:none; display:flex; flex-wrap:wrap; gap:32px;
  align-items:flex-end; justify-content:space-between;
}

.grid-2{
  display:grid; grid-template-columns:1fr 1fr; gap:80px; align-items:start;
}
.grid-2--sticky > *:first-child{ position:sticky; top:120px; }

/* ---------- Tipografía de apoyo ---------- */
.eyebrow{
  font-family:var(--font-display);
  font-size:12px; font-weight:600; letter-spacing:.18em;
  text-transform:uppercase; color:var(--accent);
  margin:0 0 22px;
}
.eyebrow--light{ color:var(--accent); }

.h2{ font-size:clamp(2.1rem, 4.2vw, 3.4rem); margin-bottom:26px; }
.lead{ font-size:1.12rem; color:var(--ink-soft); max-width:56ch; }
.section--dark .lead{ max-width:56ch; }

/* ---------- Botones ---------- */
.btn{
  display:inline-flex; align-items:center; justify-content:center; gap:10px;
  font-family:var(--font-display); font-size:14px; font-weight:600;
  letter-spacing:.02em;
  padding:16px 30px; border:1px solid transparent; border-radius:var(--radius);
  cursor:pointer; transition:background .25s var(--ease), color .25s var(--ease), border-color .25s var(--ease), transform .25s var(--ease);
}
.btn--solid{ background:var(--ink); color:#fff; }
.btn--solid:hover{ background:var(--accent); }
.btn--ghost{ border-color:currentColor; color:#fff; }
.btn--ghost:hover{ background:#fff; color:var(--ink); border-color:#fff; }
.btn--sm{ padding:11px 20px; font-size:13px; }
.btn--block{ width:100%; }

.link-arrow{
  display:inline-flex; align-items:center; gap:10px;
  font-family:var(--font-display); font-weight:600; font-size:14px;
  letter-spacing:.02em;
  border-bottom:1px solid var(--accent); padding-bottom:4px;
  color:var(--accent); margin-top:28px;
  transition:gap .25s var(--ease);
}
.link-arrow::after{ content:"→"; }
.link-arrow:hover{ gap:16px; }

/* ---------- Header ---------- */
.header{
  position:fixed; inset:0 0 auto 0; z-index:100;
  transition:background .35s var(--ease), box-shadow .35s var(--ease), border-color .35s;
  border-bottom:1px solid transparent;
}
.header__inner{
  display:flex; align-items:center; justify-content:space-between;
  height:88px; transition:height .35s var(--ease);
}
.header.is-stuck{
  background:rgba(255,255,255,.94);
  backdrop-filter:blur(14px);
  border-bottom-color:var(--line);
}
.header.is-stuck .header__inner{ height:70px; }
.header.is-stuck .logo,
.header.is-stuck .nav__list a{ color:var(--ink); }
.header.is-stuck .nav__list a::after{ background:var(--ink); }

.logo{
  display:flex; align-items:center; gap:11px; color:#fff;
  font-family:var(--font-display); font-size:16px; letter-spacing:-.02em;
  transition:color .35s var(--ease);
}
.logo__mark{ width:26px; height:26px; fill:var(--accent); flex:none; }
.logo__text{ font-weight:400; }
.logo__text strong{ font-weight:700; margin-left:.3ch; }
.logo--light{ color:#fff; }

.nav{ display:flex; align-items:center; gap:38px; }
.nav__list{ display:flex; gap:32px; }
.nav__list a{
  position:relative; color:#fff; font-size:14px; font-weight:400;
  transition:color .35s var(--ease), opacity .25s;
}
.nav__list a::after{
  content:""; position:absolute; left:0; bottom:-6px;
  width:100%; height:1px; background:#fff;
  transform:scaleX(0); transform-origin:right;
  transition:transform .35s var(--ease);
}
.nav__list a:hover::after,
.nav__list a.is-active::after{ transform:scaleX(1); transform-origin:left; }

/* ---------- Selector de idioma ---------- */
.langs{
  display:flex; align-items:center; gap:7px;
  font-family:var(--font-display); font-size:13px; font-weight:600;
  letter-spacing:.06em; color:rgba(255,255,255,.35);
}
.langs a{ color:rgba(255,255,255,.6); transition:color .25s var(--ease); }
.langs a:hover,
.langs a.is-active{ color:#fff; }
.header.is-stuck .langs{ color:rgba(20,20,15,.3); }
.header.is-stuck .langs a{ color:var(--muted); }
.header.is-stuck .langs a:hover,
.header.is-stuck .langs a.is-active{ color:var(--ink); }

.langs--footer{ margin-top:24px; color:rgba(255,255,255,.22); font-weight:500; }
.langs--footer a{ color:#8d8a81; }
.langs--footer a:hover,
.langs--footer a.is-active{ color:var(--accent); }

.burger{
  display:none; width:44px; height:44px; background:none; border:0;
  padding:10px; cursor:pointer; flex-direction:column; justify-content:space-between;
}
.burger span{
  display:block; height:2px; width:100%; background:#fff;
  transition:transform .3s var(--ease), opacity .2s;
}
.header.is-stuck .burger span,
body.nav-open .burger span{ background:var(--ink); }
body.nav-open .burger span:nth-child(1){ transform:translateY(10px) rotate(45deg); }
body.nav-open .burger span:nth-child(2){ opacity:0; }
body.nav-open .burger span:nth-child(3){ transform:translateY(-10px) rotate(-45deg); }

/* ---------- Hero ---------- */
.hero{
  position:relative; min-height:100svh; display:flex; align-items:center;
  color:#fff; overflow:hidden; padding:140px 0 110px;
}
.hero__bg{
  position:absolute; inset:0; z-index:0;
  background:
    linear-gradient(180deg, rgba(20,20,15,.86) 0%, rgba(20,20,15,.62) 42%, rgba(20,20,15,.92) 100%),
    url("../img/hero.svg") center/cover no-repeat,
    var(--bg-dark);
  transform:scale(1.06);
  animation:heroZoom 18s var(--ease) forwards;
}
@keyframes heroZoom{ to{ transform:scale(1); } }

.hero__inner{ position:relative; z-index:1; max-width:920px; }
.hero__title{
  font-size:clamp(2.8rem, 7.4vw, 6rem);
  margin-bottom:30px;
}
.hero__title em{ color:var(--accent); }
.hero__lead{
  font-size:clamp(1.02rem,1.6vw,1.22rem); color:#cfccc4;
  max-width:56ch; margin-bottom:44px;
}
.hero__actions{ display:flex; flex-wrap:wrap; gap:14px; }

.hero__scroll{
  position:absolute; left:50%; bottom:38px; z-index:1;
  width:24px; height:40px; border:1px solid rgba(255,255,255,.45);
  border-radius:14px; transform:translateX(-50%);
  display:flex; justify-content:center; padding-top:8px;
}
.hero__scroll span{
  width:3px; height:7px; border-radius:2px; background:#fff;
  animation:scrollDot 1.9s var(--ease) infinite;
}
@keyframes scrollDot{
  0%{ transform:translateY(0); opacity:1; }
  70%{ transform:translateY(14px); opacity:0; }
  100%{ transform:translateY(0); opacity:0; }
}

/* ---------- Stats ---------- */
.stats{ background:var(--bg-alt); border-bottom:1px solid var(--line); }
.stats__grid{
  display:grid; grid-template-columns:repeat(4,1fr);
  padding-block:64px; gap:32px;
}
.stat{ text-align:left; border-left:2px solid var(--accent); padding-left:20px; }
.stat__num{
  display:block; font-family:var(--font-display); font-weight:600;
  font-size:clamp(2rem,3.4vw,2.9rem); letter-spacing:-.04em; line-height:1;
  margin-bottom:10px;
}
.stat__label{ font-size:14px; color:var(--muted); }

/* ---------- Figuras ---------- */
.figure{ margin:0; }
.figure img{
  width:100%; aspect-ratio:4/5; object-fit:cover;
  border-radius:var(--radius);
}
.figure figcaption{
  margin-top:14px; font-size:13px; color:var(--muted);
  letter-spacing:.04em; text-transform:uppercase;
}

/* ---------- Checklist ---------- */
.checklist{ margin:30px 0 0; display:grid; gap:12px; }
.checklist li{
  position:relative; padding-left:30px; font-size:15.5px; color:var(--ink-soft);
}
.checklist li::before{
  content:""; position:absolute; left:0; top:.62em;
  width:14px; height:7px; border-left:2px solid var(--accent);
  border-bottom:2px solid var(--accent); transform:rotate(-45deg);
}

/* ---------- Cards de servicios ---------- */
.cards{
  display:grid; grid-template-columns:repeat(3,1fr);
  gap:1px; background:var(--line); border:1px solid var(--line);
}
.card{
  background:var(--bg-alt); padding:44px 36px 48px;
  transition:background .35s var(--ease), transform .35s var(--ease);
}
.card:hover{ background:#fff; }
.card__num{
  display:block; font-family:var(--font-display); font-size:12px;
  font-weight:600; letter-spacing:.18em; color:var(--accent); margin-bottom:26px;
}
.card h3{ font-size:1.28rem; margin-bottom:14px; }
.card p{ font-size:15.5px; color:var(--muted); margin:0; }

/* ---------- Proceso ---------- */
.steps{
  display:grid; grid-template-columns:repeat(5,1fr);
  border-top:1px solid rgba(255,255,255,.16);
}
.step{
  position:relative; padding:38px 30px 0;
  border-left:1px solid rgba(255,255,255,.16);
}
.step:first-child{ padding-left:0; border-left:0; }
.step:last-child{ padding-right:0; }
.step__num{
  display:block; font-family:var(--font-display); font-size:2.4rem; font-weight:600;
  letter-spacing:-.05em; color:rgba(255,255,255,.22); margin-bottom:22px;
  transition:color .35s var(--ease);
}
.step:hover .step__num{ color:var(--accent); }
.step h3{ font-size:1.06rem; margin-bottom:12px; line-height:1.25; }
.step p{ font-size:14.5px; color:#a9a69d; margin:0; }

/* ---------- Proyectos ---------- */
.filters{ display:flex; flex-wrap:wrap; gap:8px; }
.filter{
  background:none; border:1px solid var(--line); border-radius:100px;
  padding:9px 20px; font-family:var(--font-display); font-size:13px; font-weight:500;
  cursor:pointer; color:var(--muted);
  transition:background .25s var(--ease), color .25s var(--ease), border-color .25s var(--ease);
}
.filter:hover{ border-color:var(--ink); color:var(--ink); }
.filter.is-active{ background:var(--ink); border-color:var(--ink); color:#fff; }

.projects{ display:grid; grid-template-columns:repeat(3,1fr); gap:28px; }
.project{ transition:opacity .35s var(--ease), transform .35s var(--ease); }
.project.is-hidden{ display:none; }
.project__img{ overflow:hidden; border-radius:var(--radius); background:var(--bg-alt); }
.project__img img{
  width:100%; aspect-ratio:4/3; object-fit:cover;
  transition:transform .7s var(--ease), filter .5s var(--ease);
  filter:grayscale(.35);
}
.project:hover .project__img img{ transform:scale(1.06); filter:grayscale(0); }
.project__meta{ padding-top:18px; }
.project__meta h3{ font-size:1.16rem; margin-bottom:6px; }
.project__meta p{ font-size:14px; color:var(--muted); margin:0; }

/* ---------- Por qué ---------- */
.whys{ display:grid; grid-template-columns:repeat(4,1fr); gap:40px; }
.why{ padding-top:26px; border-top:2px solid var(--ink); }
.why h3{ font-size:1.18rem; margin-bottom:12px; }
.why p{ font-size:15px; color:var(--muted); margin:0; }

/* ---------- Testimonios ---------- */
.testimonials{ padding-block:100px; }
.quotes{ display:grid; grid-template-columns:repeat(3,1fr); gap:48px; }
.quote{ margin:0; }
.quote p{
  font-family:var(--font-serif); font-size:1.42rem; line-height:1.44;
  letter-spacing:-.01em; margin-bottom:20px;
}
.quote cite{
  font-family:var(--font-display); font-style:normal; font-size:12.5px;
  font-weight:600; letter-spacing:.14em; text-transform:uppercase; color:var(--muted);
}

/* ---------- FAQ ---------- */
.faq{ border-top:1px solid var(--line); }
.faq__item{ border-bottom:1px solid var(--line); }
.faq__item summary{
  list-style:none; cursor:pointer; padding:26px 44px 26px 0; position:relative;
  font-family:var(--font-display); font-size:1.06rem; font-weight:500;
  letter-spacing:-.01em; line-height:1.35;
  transition:color .25s var(--ease);
}
.faq__item summary::-webkit-details-marker{ display:none; }
.faq__item summary:hover{ color:var(--accent); }
.faq__item summary::after{
  content:""; position:absolute; right:6px; top:50%;
  width:11px; height:11px; margin-top:-7px;
  border-right:2px solid var(--accent); border-bottom:2px solid var(--accent);
  transform:rotate(45deg); transition:transform .3s var(--ease);
}
.faq__item[open] summary::after{ transform:rotate(-135deg); margin-top:-2px; }
.faq__body{ padding:0 40px 28px 0; }
.faq__body p{ font-size:15.5px; color:var(--muted); margin:0; }
.faq__item[open] .faq__body{ animation:fadeDown .4s var(--ease); }
@keyframes fadeDown{ from{ opacity:0; transform:translateY(-8px); } to{ opacity:1; transform:none; } }

/* ---------- Contacto ---------- */
.contact-list{ margin-top:44px; display:grid; gap:2px; }
.contact-list li{
  display:flex; flex-wrap:wrap; gap:6px 24px; justify-content:space-between;
  padding:18px 0; border-bottom:1px solid rgba(255,255,255,.14);
}
.contact-list span:first-child{
  font-family:var(--font-display); font-size:12px; font-weight:600;
  letter-spacing:.14em; text-transform:uppercase; color:#8d8a81;
}
.contact-list a{ color:#fff; border-bottom:1px solid transparent; transition:border-color .25s; }
.contact-list a:hover{ border-bottom-color:var(--accent); }

.form{ background:#1c1c16; padding:44px 40px; border:1px solid rgba(255,255,255,.1); }
.form__row{ display:grid; grid-template-columns:1fr 1fr; gap:18px; }
.field{ margin-bottom:20px; display:flex; flex-direction:column; }
.field label{
  font-family:var(--font-display); font-size:12px; font-weight:600;
  letter-spacing:.12em; text-transform:uppercase; color:#8d8a81; margin-bottom:9px;
}
.field input,
.field select,
.field textarea{
  background:transparent; border:0; border-bottom:1px solid rgba(255,255,255,.24);
  color:#fff; font-family:var(--font-body); font-size:16px; font-weight:300;
  padding:11px 0; border-radius:0;
  transition:border-color .25s var(--ease);
}
.field textarea{ resize:vertical; min-height:96px; }
.field input:focus,
.field select:focus,
.field textarea:focus{ outline:none; border-bottom-color:var(--accent); }
.field input::placeholder,
.field textarea::placeholder{ color:#6c6960; }
.field select option{ background:#1c1c16; color:#fff; }
.field__error{ font-size:12.5px; color:#e08a72; margin-top:7px; min-height:0; }
.field.has-error input,
.field.has-error select,
.field.has-error textarea{ border-bottom-color:#e08a72; }

.check{
  display:flex; align-items:flex-start; gap:11px; flex-wrap:wrap;
  font-size:14px; color:#a9a69d; margin:6px 0 26px; cursor:pointer;
}
.check input{ margin-top:5px; accent-color:var(--accent); flex:none; }
.check .field__error{ flex-basis:100%; margin-top:0; }
.check.has-error span{ color:#e08a72; }

.form__note{ margin:16px 0 0; font-size:14px; color:#a9a69d; min-height:1.4em; }
.form__note.is-ok{ color:#8fbf8f; }

/* ---------- Footer ---------- */
.footer{ background:#0e0e0a; color:#8d8a81; padding-top:80px; font-size:14.5px; }
.footer__inner{
  display:grid; grid-template-columns:1.3fr 2fr; gap:60px; padding-bottom:64px;
}
.footer__brand p{ margin-top:20px; max-width:38ch; }
.footer__nav{ display:grid; grid-template-columns:repeat(3,1fr); gap:32px; }
.footer__nav h4{
  font-size:12px; font-weight:600; letter-spacing:.14em; text-transform:uppercase;
  color:#fff; margin-bottom:18px;
}
.footer__nav li{ margin-bottom:10px; }
.footer__nav a{ transition:color .25s; }
.footer__nav a:hover{ color:var(--accent); }

.footer__bottom{
  display:flex; flex-wrap:wrap; gap:16px; justify-content:space-between;
  align-items:center; padding-block:26px; border-top:1px solid rgba(255,255,255,.1);
  font-size:13px;
}
.footer__bottom p{ margin:0; }
.social{ display:flex; gap:8px; }
.social a{
  display:grid; place-items:center; width:34px; height:34px;
  border:1px solid rgba(255,255,255,.16); border-radius:50%;
  font-size:11px; letter-spacing:.06em;
  transition:background .25s, color .25s, border-color .25s;
}
.social a:hover{ background:var(--accent); border-color:var(--accent); color:#fff; }

/* ---------- WhatsApp flotante ---------- */
.wa{
  position:fixed; right:22px; bottom:22px; z-index:90;
  width:56px; height:56px; border-radius:50%;
  background:#25d366; display:grid; place-items:center;
  box-shadow:0 8px 26px rgba(0,0,0,.25);
  transition:transform .3s var(--ease);
}
.wa svg{ width:30px; height:30px; fill:#fff; }
.wa:hover{ transform:translateY(-4px) scale(1.04); }

/* ---------- Animación de aparición ---------- */
.reveal{
  opacity:0; transform:translateY(26px);
  transition:opacity .8s var(--ease), transform .8s var(--ease);
}
.reveal.is-visible{ opacity:1; transform:none; }

/* =========================================================
   Responsive
   ========================================================= */
@media (max-width:1080px){
  .cards{ grid-template-columns:repeat(2,1fr); }
  .projects{ grid-template-columns:repeat(2,1fr); }
  .whys{ grid-template-columns:repeat(2,1fr); gap:34px; }
  .steps{ grid-template-columns:repeat(2,1fr); column-gap:44px; }
  .step{
    border-left:0; border-bottom:1px solid rgba(255,255,255,.16);
    padding:34px 0;
  }
  .quotes{ grid-template-columns:1fr; gap:36px; }
  .grid-2{ gap:56px; }
}

@media (max-width:900px){
  html{ scroll-padding-top:72px; }
  .section{ padding:84px 0; }
  .grid-2{ grid-template-columns:1fr; gap:44px; }
  .grid-2--sticky > *:first-child{ position:static; }
  .stats__grid{ grid-template-columns:repeat(2,1fr); gap:28px; padding-block:48px; }
  .footer__inner{ grid-template-columns:1fr; gap:44px; }

  .burger{ display:flex; }
  .nav{
    position:fixed; inset:0 0 0 auto; width:min(340px,84vw);
    background:#fff; flex-direction:column; align-items:flex-start;
    justify-content:flex-start; gap:0; padding:104px 32px 40px;
    transform:translateX(100%); transition:transform .4s var(--ease);
    box-shadow:-20px 0 60px rgba(0,0,0,.18);
  }
  body.nav-open .nav{ transform:none; }
  body.nav-open{ overflow:hidden; }
  .nav__list{ flex-direction:column; gap:0; width:100%; }
  .nav__list li{ border-bottom:1px solid var(--line); }
  .nav__list a{
    color:var(--ink); display:block; padding:17px 0;
    font-family:var(--font-display); font-size:17px; font-weight:500;
  }
  .nav__list a::after{ display:none; }
  .nav .langs{
    margin-top:26px; font-size:15px; gap:9px; color:rgba(20,20,15,.28);
  }
  .nav .langs a{ color:var(--muted); }
  .nav .langs a:hover,
  .nav .langs a.is-active{ color:var(--ink); }
  .nav__cta{ margin-top:22px; width:100%; }
}

@media (max-width:620px){
  body{ font-size:16px; }
  .section{ padding:68px 0; }
  .hero{ padding:120px 0 96px; }
  .hero__actions .btn{ flex:1 1 100%; }
  .cards{ grid-template-columns:1fr; }
  .projects{ grid-template-columns:1fr; }
  .whys{ grid-template-columns:1fr; }
  .steps{ grid-template-columns:1fr; column-gap:0; }
  .stats__grid{ grid-template-columns:1fr; }
  .form{ padding:32px 22px; }
  .form__row{ grid-template-columns:1fr; gap:0; }
  .footer__nav{ grid-template-columns:1fr 1fr; }
  .section__head{ margin-bottom:44px; }
  .wa{ width:50px; height:50px; right:16px; bottom:16px; }
  .wa svg{ width:26px; height:26px; }
}

/* ---------- Preferencias de movimiento ---------- */
@media (prefers-reduced-motion:reduce){
  html{ scroll-behavior:auto; }
  *,*::before,*::after{
    animation-duration:.001ms !important; animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .reveal{ opacity:1; transform:none; }
}

/* ---------- Impresión ---------- */
@media print{
  .header,.wa,.hero__scroll,.filters,.form{ display:none !important; }
  body{ color:#000; }
  .section--dark{ background:#fff; color:#000; }
}