/* =============================================
   ESTRUCTURA Constructora — styles.css
   Paleta: Negro, Gris Carbón, Blanco, Naranja acero
   Tipografía: Bebas Neue (display) + Barlow (body)
   ============================================= */

/* ── Variables ── */
:root {
  --clr-black:    #0a0a0a;
  --clr-dark:     #111111;
  --clr-carbon:   #1c1c1c;
  --clr-gray:     #2e2e2e;
  --clr-mid:      #555555;
  --clr-light:    #aaaaaa;
  --clr-white:    #f5f5f5;
  --clr-accent:   #F8D900;
  --clr-accent2:  #c5b221;
  --clr-surface:  #161616;
  --font-display: 'Bebas Neue', sans-serif;
  --font-cond:    'Barlow Condensed', sans-serif;
  --font-body:    'Barlow', sans-serif;
  --nav-h:        72px;
  --radius:       4px;
  --transition:   0.35s ease;
}

/* ── Reset ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  background: var(--clr-black);
  color: var(--clr-white);
  font-family: var(--font-body);
  font-weight: 400;
  line-height: 1.65;
  overflow-x: hidden;
}
img { display: block; max-width: 100%; height: auto; }
a { text-decoration: none; color: inherit; }
ul { list-style: none; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--clr-dark); }
::-webkit-scrollbar-thumb { background: var(--clr-accent); border-radius: 3px; }

/* ── Botones ── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 30px;
  border-radius: var(--radius);
  font-family: var(--font-cond);
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  transition: var(--transition);
  white-space: nowrap;
}
.btn-primary { background: var(--clr-accent); color: #111111; }
.btn-primary:hover { background: var(--clr-accent2); transform: translateY(-2px); box-shadow: 0 8px 24px rgba(224,123,48,.35); }
.btn-ghost { border: 1px solid rgba(255,255,255,.35); color: var(--clr-white); }
.btn-ghost:hover { border-color: var(--clr-accent); color: var(--clr-accent); transform: translateY(-2px); }
.btn.full { width: 100%; justify-content: center; }

/* ── Tipografía compartida ── */
.section-eyebrow {
  display: block;
  font-family: var(--font-cond);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--clr-accent);
  margin-bottom: 12px;
}
.section-title {
  font-family: var(--font-display);
  font-size: clamp(2.2rem, 4vw, 3.4rem);
  line-height: 1.05;
  color: var(--clr-white);
  margin-bottom: 28px;
}
.section-title.centered { text-align: center; }

/* ── Animaciones de scroll ── */
.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.7s ease calc(var(--d, 0s)), transform 0.7s ease calc(var(--d, 0s));
}
.reveal.visible { opacity: 1; transform: translateY(0); }

.fade-up {
  opacity: 0;
  transform: translateY(30px);
  animation: fadeUp 0.9s forwards calc(var(--d, 0s));
}
@keyframes fadeUp { to { opacity: 1; transform: translateY(0); } }

/* ─────────────────────────────────────
   NAVBAR
───────────────────────────────────── */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  padding: 0 5%;
  transition: background 0.4s, box-shadow 0.4s;
}
.navbar.scrolled {
  background: rgba(10,10,10,.97);
  backdrop-filter: blur(12px);
  box-shadow: 0 2px 20px rgba(0,0,0,.6);
}
.nav-container {
  width: 100%;
  max-width: 1300px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav-logo {
  font-family: var(--font-display);
  font-size: 1.6rem;
  letter-spacing: 0.1em;
  color: var(--clr-white);
  display: flex;
  align-items: center;
  gap: 8px;
}
.nav-logo-img {
  height: 100px;
  width: auto;
  display: block;
  object-fit: contain;
  border-radius: 5px;
  transition: opacity 0.3s;
}
.nav-logo-img:hover { opacity: 0.8; }
.logo-icon { color: var(--clr-accent); }
.nav-links { display: flex; align-items: center; gap: 8px; }
.nav-link {
  font-family: var(--font-cond);
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 6px 14px;
  color: var(--clr-light);
  transition: color var(--transition);
}
.nav-link:hover, .nav-link.active { color: var(--clr-accent); }
.nav-cta {
  font-family: var(--font-cond);
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 9px 20px;
  border: 1px solid var(--clr-accent);
  border-radius: var(--radius);
  color: var(--clr-accent);
  transition: var(--transition);
  margin-left: 8px;
}
.nav-cta:hover { background: var(--clr-accent); color: #fff; }

/* Hamburger */
.nav-toggle { display: none; flex-direction: column; gap: 5px; padding: 6px; }
.nav-toggle span { display: block; width: 24px; height: 2px; background: var(--clr-white); transition: var(--transition); }
.nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ─────────────────────────────────────
   HERO
───────────────────────────────────── */
.hero {
  position: relative;
  height: 100vh;
  min-height: 640px;
  display: flex;
  align-items: center;
  overflow: hidden;
}
.hero-bg { position: absolute; inset: 0; }
.hero-img { width: 100%; height: 100%; object-fit: cover; object-position: center; }
.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(120deg, rgba(0,0,0,.88) 0%, rgba(0,0,0,.6) 55%, rgba(0,0,0,.3) 100%);
}
.hero-content { position: relative; z-index: 2; padding: 0 8%; max-width: 900px; }
.hero-eyebrow {
  font-family: var(--font-cond);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--clr-accent);
  margin-bottom: 16px;
}
.hero-title {
  font-family: var(--font-display);
  font-size: clamp(3.8rem, 9vw, 8rem);
  line-height: 0.95;
  color: var(--clr-white);
  margin-bottom: 24px;
}
.hero-accent { color: var(--clr-accent); }
.hero-sub {
  font-size: clamp(1rem, 1.5vw, 1.15rem);
  font-weight: 300;
  color: rgba(245,245,245,.75);
  margin-bottom: 40px;
  max-width: 480px;
}
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }

/* Scroll indicator */
.hero-scroll {
  position: absolute;
  bottom: 36px; left: 50%;
  transform: translateX(-50%);
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}
.hero-scroll span {
  font-family: var(--font-cond);
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: rgba(255,255,255,.4);
}
.scroll-line {
  width: 1px; height: 50px;
  background: linear-gradient(to bottom, rgba(224,123,48,.8), transparent);
  animation: scrollPulse 2s ease-in-out infinite;
}
@keyframes scrollPulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.3; }
}

/* ─────────────────────────────────────
   STATS BAR
───────────────────────────────────── */
.stats-bar { background: var(--clr-accent); padding: 52px 5%; }
.stats-container {
  max-width: 1100px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  text-align: center;
}
.stat-item { color: #fff; }
.stat-num { font-family: var(--font-display); font-size: clamp(2.6rem, 5vw, 4rem); line-height: 1; color: #111111; }
.stat-suffix { font-family: var(--font-display); font-size: clamp(1.6rem, 3vw, 2.4rem); color: #111111; }
.stat-label { font-family: var(--font-cond); font-size: 0.85rem; letter-spacing: 0.1em; text-transform: uppercase; color: #111111; margin-top: 6px; }

/* ─────────────────────────────────────
   SOBRE NOSOTROS
───────────────────────────────────── */
.about { padding: 110px 5%; background: var(--clr-dark); }
.section-container {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}
.about-image { position: relative; }
.about-img { width: 100%; height: 520px; object-fit: cover; border-radius: var(--radius); filter: grayscale(15%); }
.about-badge {
  position: absolute;
  bottom: -24px; right: -24px;
  background: var(--clr-accent);
  color: #fff;
  padding: 22px 28px;
  text-align: center;
  border-radius: var(--radius);
  box-shadow: 0 12px 32px rgba(224,123,48,.4);
}
.badge-num { display: block; font-family: var(--font-display); font-size: 3.2rem; line-height: 1;color : #111111; }
.badge-text { display: block; font-family: var(--font-cond); font-size: 0.8rem; letter-spacing: 0.08em; text-transform: uppercase; color: #111111; margin-top: 4px; }
.about-desc { color: var(--clr-light); font-size: 1rem; margin-bottom: 36px; line-height: 1.75; }
.about-desc strong { color: var(--clr-accent); }

/* MVV */
.mvv-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.mvv-card {
  background: var(--clr-carbon);
  border: 1px solid var(--clr-gray);
  border-radius: var(--radius);
  padding: 20px;
  transition: border-color var(--transition), transform var(--transition);
}
.mvv-card:hover { border-color: var(--clr-accent); transform: translateY(-4px); }
.mvv-icon { font-size: 1.3rem; color: var(--clr-accent); margin-bottom: 10px; }
.mvv-card h4 { font-family: var(--font-cond); font-size: 1rem; font-weight: 600; letter-spacing: 0.06em; text-transform: uppercase; color: var(--clr-white); margin-bottom: 8px; }
.mvv-card p { font-size: 0.85rem; color: var(--clr-light); line-height: 1.6; }

/* ─────────────────────────────────────
   SERVICIOS
───────────────────────────────────── */
.servicios { padding: 110px 5%; background: var(--clr-black); }
.section-container-center { max-width: 1200px; margin: 0 auto; }
.servicios-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; margin-top: 48px; }
.servicio-card {
  background: var(--clr-surface);
  border: 1px solid var(--clr-gray);
  border-radius: var(--radius);
  padding: 36px 28px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}
.servicio-card::before {
  content: '';
  position: absolute;
  bottom: 0; left: 0;
  width: 0; height: 3px;
  background: var(--clr-accent);
  transition: width 0.4s ease;
}
.servicio-card:hover::before { width: 100%; }
.servicio-card:hover { border-color: rgba(224 186 48 / 30%); transform: translateY(-6px); box-shadow: 0 16px 40px rgba(0,0,0,.4); }
.servicio-icon { font-size: 1.8rem; color: var(--clr-accent); margin-bottom: 18px; }
.servicio-card h3 { font-family: var(--font-cond); font-size: 1.15rem; font-weight: 700; letter-spacing: 0.04em; text-transform: uppercase; color: var(--clr-white); margin-bottom: 10px; }
.servicio-card p { font-size: 0.9rem; color: var(--clr-light); line-height: 1.65; }

/* ─────────────────────────────────────
   PROYECTOS
───────────────────────────────────── */
.proyectos { padding: 110px 5%; background: var(--clr-carbon); }
.filtros { display: flex; justify-content: center; gap: 10px; flex-wrap: wrap; margin: 36px 0 48px; }
.filtro-btn {
  font-family: var(--font-cond);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 9px 22px;
  border-radius: var(--radius);
  border: 1px solid var(--clr-gray);
  color: var(--clr-light);
  transition: var(--transition);
}
.filtro-btn:hover, .filtro-btn.active { background: var(--clr-accent); border-color: var(--clr-accent); color: #111111; }
.proyectos-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.proyecto-card {
  background: var(--clr-surface);
  border-radius: var(--radius);
  overflow: hidden;
  cursor: pointer;
  transition: var(--transition);
}
.proyecto-card:hover { transform: translateY(-8px); box-shadow: 0 20px 50px rgba(0,0,0,.5); }
.proyecto-card.hidden { display: none; }
.proyecto-img-wrap { position: relative; overflow: hidden; height: 220px; }
.proyecto-img-wrap img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.5s ease; }
.proyecto-card:hover .proyecto-img-wrap img { transform: scale(1.07); }
.proyecto-hover {
  position: absolute; inset: 0;
  background: rgba(224 186 48 / 30%);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity 0.35s ease;
}
.proyecto-card:hover .proyecto-hover { opacity: 1; }
.proyecto-hover span {
  font-family: var(--font-cond);
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: #fff;
  text-transform: uppercase;
  display: flex;
  align-items: center;
  gap: 8px;
}
.proyecto-info { padding: 20px 22px 26px; }
.proyecto-tag { font-family: var(--font-cond); font-size: 0.72rem; font-weight: 600; letter-spacing: 0.15em; text-transform: uppercase; color: var(--clr-accent); display: block; margin-bottom: 8px; }
.proyecto-info h3 { font-family: var(--font-cond); font-size: 1.1rem; font-weight: 700; color: var(--clr-white); margin-bottom: 6px; }
.proyecto-info p { font-size: 0.85rem; color: var(--clr-light); line-height: 1.55; }

/* ─────────────────────────────────────
   CONTACTO
───────────────────────────────────── */
.contacto { padding: 110px 5% 0; background: var(--clr-dark); }
.contacto-container { max-width: 1200px; margin: 0 auto; display: grid; grid-template-columns: 1fr 1.1fr; gap: 72px; padding-bottom: 80px; }
.contacto-desc { color: var(--clr-light); font-size: 1rem; margin-bottom: 40px; max-width: 400px; line-height: 1.7; }
.contacto-datos { display: flex; flex-direction: column; gap: 22px; }
.contacto-datos li { display: flex; gap: 16px; align-items: flex-start; }
.dato-icon { width: 40px; height: 40px; flex-shrink: 0; background: rgba(224,123,48,.12); border-radius: var(--radius); display: flex; align-items: center; justify-content: center; font-size: 0.9rem; color: var(--clr-accent); margin-top: 2px; }
.contacto-datos span { display: block; font-family: var(--font-cond); font-size: 0.72rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--clr-accent); margin-bottom: 2px; }
.contacto-datos a, .contacto-datos p { font-size: 0.9rem; color: var(--clr-light); line-height: 1.5; }
.contacto-datos a:hover { color: var(--clr-accent); }

/* Formulario */
.contacto-form-wrap { background: var(--clr-carbon); border: 1px solid var(--clr-gray); border-radius: var(--radius); padding: 44px 40px; }
.contacto-form { display: flex; flex-direction: column; gap: 18px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.form-group { display: flex; flex-direction: column; gap: 6px; }
.form-group label { font-family: var(--font-cond); font-size: 0.78rem; font-weight: 600; letter-spacing: 0.1em; text-transform: uppercase; color: var(--clr-light); }
.form-group input, .form-group select, .form-group textarea {
  background: var(--clr-surface);
  border: 1px solid var(--clr-gray);
  border-radius: var(--radius);
  color: var(--clr-white);
  font-family: var(--font-body);
  font-size: 0.9rem;
  padding: 12px 16px;
  transition: border-color var(--transition);
  outline: none;
  -webkit-appearance: none;
}
.form-group input:focus, .form-group select:focus, .form-group textarea:focus { border-color: var(--clr-accent); background: rgba(224,123,48,.04); }
.form-group input::placeholder, .form-group textarea::placeholder { color: var(--clr-mid); }
.form-group select option { background: var(--clr-carbon); }
.form-group textarea { resize: vertical; min-height: 110px; }
.form-error { font-size: 0.75rem; color: #e05c5c; display: none; }
.form-error.visible { display: block; }
.form-success { display: none; align-items: center; gap: 12px; background: rgba(34,197,94,.1); border: 1px solid rgba(34,197,94,.3); border-radius: var(--radius); padding: 14px 18px; color: #4ade80; font-size: 0.9rem; }
.form-success.visible { display: flex; }
.form-success i { font-size: 1.3rem; }

/* Mapa */
.mapa-wrap { max-width: 1300px; margin: 0 auto; border-radius: var(--radius); overflow: hidden; border: 1px solid var(--clr-gray); filter: grayscale(40%) contrast(1.1); }

/* ─────────────────────────────────────
   FOOTER
───────────────────────────────────── */
.footer { background: var(--clr-black); border-top: 1px solid var(--clr-gray); padding: 72px 5% 0; }
.footer-top { max-width: 1200px; margin: 0 auto; display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 48px; padding-bottom: 56px; border-bottom: 1px solid var(--clr-gray); }
.footer-brand p { font-size: 0.9rem; color: var(--clr-mid); margin: 16px 0 24px; max-width: 260px; line-height: 1.65; }
.social-links { display: flex; gap: 10px; }
.social-links a { width: 36px; height: 36px; border-radius: var(--radius); border: 1px solid var(--clr-gray); display: flex; align-items: center; justify-content: center; font-size: 0.85rem; color: var(--clr-light); transition: var(--transition); }
.social-links a:hover { background: var(--clr-accent); border-color: var(--clr-accent); color: #fff; }
.footer-col h4 { font-family: var(--font-cond); font-size: 0.8rem; font-weight: 600; letter-spacing: 0.15em; text-transform: uppercase; color: var(--clr-white); margin-bottom: 18px; }
.footer-col ul { display: flex; flex-direction: column; gap: 10px; }
.footer-col ul li a { font-size: 0.875rem; color: var(--clr-mid); transition: color var(--transition); }
.footer-col ul li a:hover { color: var(--clr-accent); }
.footer-contact { display: flex; flex-direction: column; gap: 10px; }
.footer-contact li { display: flex; align-items: flex-start; gap: 10px; font-size: 0.85rem; color: var(--clr-mid); }
.footer-contact li i { color: var(--clr-accent); margin-top: 3px; flex-shrink: 0; }
.footer-bottom { max-width: 1200px; margin: 0 auto; display: flex; justify-content: space-between; align-items: center; padding: 20px 0; font-size: 0.8rem; color: var(--clr-mid); }
.footer-logo { margin-bottom: 16px; }
.footer-logo-img { height: 90px; width: auto; object-fit: contain; border-radius: 5px; opacity: 0.9; }
.footer-desc { font-size: 0.84rem; color: rgba(255,255,255,0.4); line-height: 1.8; margin-bottom: 22px; max-width: 270px; }

/* ─────────────────────────────────────
   WHATSAPP FLOTANTE
───────────────────────────────────── */
.whatsapp-float {
  position: fixed;
  bottom: 28px; right: 28px;
  z-index: 900;
  width: 56px; height: 56px;
  border-radius: 50%;
  background: #25d366;
  color: #fff;
  font-size: 1.6rem;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 20px rgba(37,211,102,.45);
  transition: var(--transition);
}
.whatsapp-float:hover { transform: scale(1.1); box-shadow: 0 8px 28px rgba(37,211,102,.6); }
.whatsapp-tooltip {
  position: absolute;
  right: calc(100% + 12px);
  background: var(--clr-carbon);
  color: var(--clr-white);
  font-family: var(--font-cond);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  padding: 6px 12px;
  border-radius: var(--radius);
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}
.whatsapp-float:hover .whatsapp-tooltip { opacity: 1; }

/* ─────────────────────────────────────
   MODAL
───────────────────────────────────── */
.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 2000;
  background: rgba(0,0,0,.85);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.35s ease;
  backdrop-filter: blur(6px);
}
.modal-overlay.open { opacity: 1; pointer-events: all; }
.modal {
  background: var(--clr-carbon);
  border: 1px solid var(--clr-gray);
  border-radius: var(--radius);
  max-width: 820px; width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  position: relative;
  transform: scale(0.9) translateY(30px);
  transition: transform 0.35s ease;
}
.modal-overlay.open .modal { transform: scale(1) translateY(0); }
.modal-close {
  position: absolute;
  top: 16px; right: 18px;
  z-index: 5;
  font-size: 1.8rem;
  color: var(--clr-light);
  line-height: 1;
  width: 36px; height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: rgba(0,0,0,.5);
  transition: var(--transition);
}
.modal-close:hover { background: var(--clr-accent); color: #fff; }
.modal-img-wrap { height: 320px; overflow: hidden; }
.modal-img-wrap img { width: 100%; height: 100%; object-fit: cover; }
.modal-body { padding: 32px 36px 40px; }
.modal-tag { font-family: var(--font-cond); font-size: 0.72rem; font-weight: 600; letter-spacing: 0.18em; text-transform: uppercase; color: var(--clr-accent); display: block; margin-bottom: 10px; }
.modal-body h2 { font-family: var(--font-display); font-size: clamp(1.6rem, 3vw, 2.2rem); color: var(--clr-white); margin-bottom: 14px; }
.modal-body > p { font-size: 0.95rem; color: var(--clr-light); line-height: 1.7; margin-bottom: 28px; }
.modal-meta { display: flex; gap: 24px; flex-wrap: wrap; margin-bottom: 32px; padding: 20px; background: var(--clr-surface); border-radius: var(--radius); }
.meta-item { display: flex; align-items: flex-start; gap: 12px; }
.meta-item > i { font-size: 1rem; color: var(--clr-accent); margin-top: 2px; }
.meta-item span { display: block; font-family: var(--font-cond); font-size: 0.7rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--clr-mid); margin-bottom: 2px; }
.meta-item strong { font-size: 0.9rem; color: var(--clr-white); font-weight: 500; }

/* ─────────────────────────────────────
   BACK TO TOP
───────────────────────────────────── */
.back-top {
  position: fixed;
  bottom: 28px; left: 28px;
  z-index: 900;
  width: 44px; height: 44px;
  border-radius: var(--radius);
  background: var(--clr-carbon);
  border: 1px solid var(--clr-gray);
  color: var(--clr-light);
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
  opacity: 0;
  pointer-events: none;
  transform: translateY(10px);
}
.back-top.visible { opacity: 1; pointer-events: all; transform: translateY(0); }
.back-top:hover { background: var(--clr-accent); border-color: var(--clr-accent); color: #fff; }

/* ===== PROCESO DE TRABAJO ===== */
.proceso {
  padding: 110px 5%;
  background: var(--clr-dark);
}
.proceso-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 0;
  margin-top: 48px;
  position: relative;
}
/* Línea conectora entre pasos */
.proceso-grid::before {
  content: '';
  position: absolute;
  top: 52px;
  left: 10%;
  right: 10%;
  height: 2px;
  background: linear-gradient(to right, var(--clr-accent), var(--clr-gray));
  z-index: 0;
}
.proceso-step {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 0 16px;
  position: relative;
  z-index: 1;
}
.proceso-num {
  font-family: var(--font-display);
  font-size: 1rem;
  letter-spacing: 0.15em;
  color: var(--clr-accent);
  margin-bottom: 4px;
}
.proceso-icon {
  width: 64px; height: 64px;
  background: var(--clr-carbon);
  border: 2px solid var(--clr-accent);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  color: var(--clr-accent);
  margin-bottom: 16px;
  transition: var(--transition);
}
.proceso-step:hover .proceso-icon {
  background: var(--clr-accent);
  color: #fff;
}
.proceso-step h3 {
  font-family: var(--font-cond);
  font-size: 0.95rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--clr-white);
  margin-bottom: 8px;
}
.proceso-step p {
  font-size: 0.82rem;
  color: var(--clr-light);
  line-height: 1.6;
}
/* ===== POR QUÉ ELEGIRNOS ===== */
.porque {
  padding: 110px 5%;
  background: var(--clr-black);
}
.porque-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 48px;
}
.porque-card {
  background: var(--clr-carbon);
  border: 1px solid var(--clr-gray);
  border-radius: var(--radius);
  padding: 32px 26px;
  text-align: center;
  transition: var(--transition);
}
.porque-card:hover {
  border-color: var(--clr-accent);
  transform: translateY(-5px);
  box-shadow: 0 14px 36px rgba(0,0,0,.4);
}
.porque-icon {
  font-size: 1.8rem;
  color: var(--clr-accent);
  margin-bottom: 16px;
}
.porque-card h3 {
  font-family: var(--font-cond);
  font-size: 1rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--clr-white);
  margin-bottom: 10px;
}
.porque-card p {
  font-size: 0.875rem;
  color: var(--clr-light);
  line-height: 1.65;
}
/* ===== FAQ ===== */
.faq {
  padding: 110px 5%;
  background: var(--clr-dark);
}
.faq-list {
  max-width: 780px;
  margin: 48px auto 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.faq-item {
  background: var(--clr-carbon);
  border: 1px solid var(--clr-gray);
  border-radius: var(--radius);
  overflow: hidden;
  transition: border-color var(--transition);
}
.faq-item.open {
  border-color: var(--clr-accent);
}
.faq-pregunta {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 18px 22px;
  font-family: var(--font-cond);
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  color: var(--clr-white);
  text-align: left;
  gap: 16px;
  transition: color var(--transition);
}
.faq-item.open .faq-pregunta {
  color: var(--clr-accent);
}
.faq-arrow {
  font-size: 0.8rem;
  flex-shrink: 0;
  transition: transform 0.35s ease;
  color: var(--clr-accent);
}
.faq-item.open .faq-arrow {
  transform: rotate(180deg);
}
.faq-respuesta {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, padding 0.3s ease;
  padding: 0 22px;
}
.faq-item.open .faq-respuesta {
  max-height: 200px;
  padding: 0 22px 18px;
}
.faq-respuesta p {
  font-size: 0.9rem;
  color: var(--clr-light);
  line-height: 1.7;
  border-top: 1px solid var(--clr-gray);
  padding-top: 14px;
}

@media (max-width: 1024px) {
  .porque-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
  .porque-grid { grid-template-columns: 1fr; }
}
@media (max-width: 1024px) {
  .proceso-grid { grid-template-columns: repeat(3, 1fr); gap: 32px; }
  .proceso-grid::before { display: none; }
}
@media (max-width: 768px) {
  .proceso-grid { grid-template-columns: 1fr 1fr; gap: 28px; }
}
@media (max-width: 480px) {
  .proceso-grid { grid-template-columns: 1fr; }
}

/* ─────────────────────────────────────
   RESPONSIVE — Tablet ≤ 1024px
───────────────────────────────────── */
@media (max-width: 1024px) {
  .section-container { grid-template-columns: 1fr; gap: 48px; }
  .about-image { max-width: 560px; margin: 0 auto; }
  .about-badge { right: 0; bottom: -20px; }
  .stats-container { grid-template-columns: repeat(2, 1fr); }
  .servicios-grid { grid-template-columns: repeat(2, 1fr); }
  .proyectos-grid { grid-template-columns: repeat(2, 1fr); }
  .mvv-grid { grid-template-columns: repeat(3, 1fr); }
  .footer-top { grid-template-columns: 1fr 1fr; gap: 36px; }
  .footer-brand { grid-column: 1 / -1; }
  .contacto-container { grid-template-columns: 1fr; gap: 48px; }
}

/* ─────────────────────────────────────
   RESPONSIVE — Mobile ≤ 768px
───────────────────────────────────── */
@media (max-width: 768px) {
  .nav-toggle { display: flex; }
  .nav-links {
    position: fixed;
    top: var(--nav-h); left: 0; right: 0;
    background: rgba(10,10,10,.98);
    backdrop-filter: blur(12px);
    flex-direction: column;
    align-items: flex-start;
    padding: 24px 5% 36px;
    gap: 21px;
    transform: translateY(-120%);
    transition: transform 0.4s ease;
    border-top: 1px solid var(--clr-gray);
  }
  .nav-links.open { transform: translateY(0); }
  .nav-link { padding: 12px 0; font-size: 1.1rem; width: 100%; }
  .nav-cta { margin-left: 0; margin-top: 12px; width: 100%; justify-content: center; }
  .hero-content { padding: 0 5%; }
  .hero-actions { flex-direction: column; }
  .btn { width: 100%; justify-content: center; }
  .stats-container { grid-template-columns: repeat(2, 1fr); }
  .about-img { height: 300px; }
  .mvv-grid { grid-template-columns: 1fr; }
  .about-badge { right: 12px; bottom: -16px; padding: 16px 18px; }
  .servicios-grid { grid-template-columns: 1fr; }
  .proyectos-grid { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }
  .contacto-form-wrap { padding: 28px 20px; }
  .footer-top { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; gap: 8px; text-align: center; }
  .modal-img-wrap { height: 220px; }
  .modal-body { padding: 22px 20px 28px; }
  .modal-meta { flex-direction: column; gap: 16px; }
  .back-top { bottom: 94px; }
  
}

@media (max-width: 480px) {
  .stats-container { grid-template-columns: 1fr 1fr; }
  .filtros { gap: 8px; }
  .filtro-btn { padding: 8px 14px; }
}