/* ============================================================
   SCALA Empresa Constructora — Hoja de estilos principal
   ============================================================ */

/* ---------- Custom properties ---------- */
:root {
  --color-accent:      #89B4E8;
  --color-accent-dark: #5d93d0;
  --color-dark:        #111827;
  --color-dark-2:      #1f2937;
  --color-dark-3:      #374151;
  --color-light:       #f9fafb;
  --color-white:       #ffffff;
  --color-text:        #6b7280;
  --color-text-light:  #9ca3af;

  --font-heading: 'Viga', sans-serif;
  --font-body:    'Inter', sans-serif;

  --radius:    14px;
  --radius-sm: 9px;
  --shadow:    0 4px 24px rgba(0,0,0,0.08);
  --shadow-lg: 0 16px 56px rgba(0,0,0,0.18);
  --transition: 0.3s ease;
  --container:  1280px;
}

/* ---------- Font face ---------- */
@font-face {
  font-family: 'Viga';
  src: url('../assets/fonts/vigaregular.ttf') format('truetype');
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}

/* ---------- Reset & base ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: var(--font-body);
  color: var(--color-dark);
  background: var(--color-white);
  line-height: 1.6;
  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; }
textarea { resize: vertical; }

/* ---------- Container ---------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 32px;
}

/* ---------- Sections ---------- */
.section { padding: 112px 0; }

.section__header {
  text-align: center;
  margin-bottom: 72px;
}

.section__badge {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-accent);
  background: rgba(137,180,232,0.12);
  padding: 7px 18px;
  border-radius: 100px;
  margin-bottom: 18px;
}
.section__badge--light { color: var(--color-white); background: rgba(255,255,255,0.15); }
.section__badge--dark  { color: var(--color-dark);  background: rgba(17,24,39,0.1); }

.section__title {
  font-family: var(--font-heading);
  font-size: clamp(2.2rem, 4.5vw, 3.2rem);
  line-height: 1.12;
  color: var(--color-dark);
}
.section__title--light { color: var(--color-white); }
.section__title--dark  { color: var(--color-dark); }

.section__subtitle {
  margin-top: 18px;
  font-size: 1.08rem;
  color: var(--color-text-light);
  max-width: 580px;
  margin-left: auto;
  margin-right: auto;
  line-height: 1.7;
}
.section__subtitle--dark { color: var(--color-text); }

.text-accent { color: var(--color-accent); }

/* ============================================================
   BUTTONS
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 15px 36px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.97rem;
  transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
  white-space: nowrap;
}
.btn:hover { transform: translateY(-2px); }

.btn--primary {
  background: var(--color-accent);
  color: var(--color-dark);
}
.btn--primary:hover { background: var(--color-accent-dark); box-shadow: 0 10px 28px rgba(137,180,232,0.45); }

.btn--outline {
  background: transparent;
  color: var(--color-white);
  border: 2px solid rgba(255,255,255,0.6);
}
.btn--outline:hover { border-color: var(--color-white); background: rgba(255,255,255,0.08); }

.btn--whatsapp {
  background: #25D366;
  color: var(--color-white);
  padding: 15px 28px;
  margin-top: 36px;
}
.btn--whatsapp svg { width: 20px; height: 20px; }
.btn--whatsapp:hover { background: #1ebe5b; }

.btn--full { width: 100%; justify-content: center; }

/* ============================================================
   HEADER / NAV
   ============================================================ */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  background: transparent;
  transition: background var(--transition), box-shadow var(--transition), backdrop-filter var(--transition);
}
.site-header.scrolled {
  background: rgba(17,24,39,0.96);
  backdrop-filter: blur(10px);
  box-shadow: 0 2px 24px rgba(0,0,0,0.35);
}

.nav {
  display: flex;
  align-items: center;
  gap: 40px;
  height: 84px;
}

.nav__logo { display: flex; align-items: center; }
.nav__logo-img {
  height: 64px;
  width: auto;
  object-fit: contain;
  filter: brightness(0) invert(1);
}

.nav__links {
  display: flex;
  gap: 36px;
  margin-left: auto;
}
.nav__link {
  font-size: 0.92rem;
  font-weight: 500;
  color: rgba(255,255,255,0.8);
  transition: color var(--transition);
  position: relative;
}
.nav__link::after {
  content: '';
  position: absolute;
  bottom: -3px; left: 0;
  width: 0; height: 2px;
  background: var(--color-accent);
  transition: width var(--transition);
}
.nav__link:hover { color: var(--color-accent); }
.nav__link:hover::after { width: 100%; }

.nav__cta { margin-left: 8px; padding: 11px 26px; }

.nav__hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  margin-left: auto;
  padding: 6px;
}
.nav__hamburger span {
  display: block;
  width: 26px;
  height: 2px;
  background: var(--color-white);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}
.nav__hamburger.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav__hamburger.active span:nth-child(2) { opacity: 0; }
.nav__hamburger.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ============================================================
   HERO
   ============================================================ */
.hero {
  position: relative;
  height: 100vh;
  min-height: 720px;
  display: flex;
  align-items: center;
  background: url('../assets/images/projects/hero.jpg') center/cover no-repeat;
  color: var(--color-white);
}

.hero__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(17,24,39,0.88) 0%, rgba(17,24,39,0.55) 100%);
}

.hero__content {
  position: relative;
  z-index: 1;
  max-width: 720px;
}

.hero__eyebrow {
  display: block;
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 24px;
}

.hero__title {
  font-family: var(--font-heading);
  font-size: clamp(3rem, 7vw, 5rem);
  line-height: 1.06;
  margin-bottom: 28px;
}

.hero__subtitle {
  font-size: 1.15rem;
  color: rgba(255,255,255,0.78);
  max-width: 560px;
  margin-bottom: 48px;
  line-height: 1.75;
}

.hero__actions { display: flex; gap: 18px; flex-wrap: wrap; }

.hero__scroll {
  position: absolute;
  bottom: 36px;
  left: 50%;
  transform: translateX(-50%);
  color: rgba(255,255,255,0.45);
  animation: bounce 2s infinite;
  z-index: 1;
}
@keyframes bounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50%       { transform: translateX(-50%) translateY(10px); }
}

/* ============================================================
   NOSOTROS
   ============================================================ */
.nosotros__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 88px;
  align-items: center;
}

.nosotros__text .section__badge { margin-bottom: 16px; }
.nosotros__text .section__title { margin-bottom: 28px; text-align: left; }

.nosotros__desc {
  color: var(--color-text);
  margin-bottom: 18px;
  font-size: 1.02rem;
  line-height: 1.78;
}

.nosotros__stats {
  display: flex;
  gap: 0;
  margin-top: 48px;
  padding-top: 36px;
  border-top: 1px solid #e5e7eb;
}

.stat {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 0 16px;
  position: relative;
}
.stat + .stat::before {
  content: '';
  position: absolute;
  left: 0; top: 10%; bottom: 10%;
  width: 1px;
  background: #e5e7eb;
}

.stat__row {
  display: flex;
  align-items: baseline;
  gap: 2px;
}
.stat__number {
  font-family: var(--font-heading);
  font-size: 3rem;
  color: var(--color-dark);
  line-height: 1;
}
.stat__plus {
  font-family: var(--font-heading);
  font-size: 1.8rem;
  color: var(--color-accent);
  line-height: 1;
}
.stat__label {
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--color-text);
  margin-top: 6px;
  letter-spacing: 0.02em;
}

.nosotros__image {
  position: relative;
  border-radius: var(--radius);
  overflow: visible;
}
.nosotros__image img {
  width: 100%;
  height: 520px;
  object-fit: cover;
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
}
.nosotros__image-badge {
  position: absolute;
  bottom: -24px;
  right: -24px;
  width: 96px;
  height: 96px;
  background: var(--color-white);
  border-radius: 50%;
  padding: 8px;
  box-shadow: var(--shadow-lg);
  overflow: hidden;
}
.nosotros__image-badge img { width: 100%; height: 100%; object-fit: cover; border-radius: 50%; }

/* ============================================================
   SERVICIOS
   ============================================================ */
.servicios { background: var(--color-dark); }

.servicios__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.servicio-card {
  background: var(--color-dark-2);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--radius);
  padding: 48px 40px;
  transition: border-color var(--transition), transform var(--transition), box-shadow var(--transition);
  position: relative;
  overflow: hidden;
}
.servicio-card::before {
  content: '';
  position: absolute;
  bottom: 0; left: 0;
  width: 0; height: 3px;
  background: var(--color-accent);
  transition: width 0.4s ease;
}
.servicio-card:hover::before { width: 100%; }
.servicio-card:hover {
  border-color: rgba(137,180,232,0.3);
  transform: translateY(-5px);
  box-shadow: 0 20px 48px rgba(0,0,0,0.35);
}

.servicio-card__icon {
  width: 60px;
  height: 60px;
  background: rgba(137,180,232,0.1);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 28px;
}
.servicio-card__icon svg {
  width: 30px;
  height: 30px;
  stroke: var(--color-accent);
}

.servicio-card__title {
  font-family: var(--font-heading);
  font-size: 1.3rem;
  color: var(--color-white);
  margin-bottom: 14px;
}

.servicio-card__desc {
  font-size: 0.94rem;
  color: var(--color-text-light);
  line-height: 1.75;
}

/* ============================================================
   PROYECTOS
   ============================================================ */
.proyectos__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.proyecto-card {
  border-radius: var(--radius);
  overflow: hidden;
  cursor: pointer;
  background: var(--color-white);
  box-shadow: 0 2px 20px rgba(0,0,0,0.07);
  transition: transform 0.35s ease, box-shadow 0.35s ease;
  display: flex;
  flex-direction: column;
}
.proyecto-card:hover {
  transform: translateY(-7px);
  box-shadow: 0 20px 52px rgba(0,0,0,0.14);
}
.proyecto-card:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 3px;
}

.proyecto-card__img-wrap {
  position: relative;
  overflow: hidden;
  aspect-ratio: 4/3;
  background: var(--color-dark-3);
  flex-shrink: 0;
}
.proyecto-card__img-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center center;
  transition: transform 0.6s ease;
}
.proyecto-card:hover .proyecto-card__img-wrap img { transform: scale(1.07); }

.proyecto-card__hover-indicator {
  position: absolute;
  inset: 0;
  background: rgba(17,24,39,0.42);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity 0.35s ease;
}
.proyecto-card:hover .proyecto-card__hover-indicator { opacity: 1; }
.proyecto-card__hover-indicator span {
  color: var(--color-white);
  font-size: 0.88rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  border: 2px solid rgba(255,255,255,0.85);
  padding: 10px 26px;
  border-radius: 100px;
}

.proyecto-card__body {
  padding: 24px 26px 28px;
  flex: 1;
  display: flex;
  flex-direction: column;
  border-top: 3px solid transparent;
  transition: border-color 0.35s ease;
}
.proyecto-card:hover .proyecto-card__body { border-top-color: var(--color-accent); }

.proyecto-card__cat {
  display: block;
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 7px;
}
.proyecto-card__name {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  color: var(--color-dark);
  line-height: 1.22;
  margin-bottom: 12px;
}
.proyecto-card__desc {
  font-size: 0.875rem;
  color: var(--color-text);
  line-height: 1.72;
  flex: 1;
  margin-bottom: 18px;
}
.proyecto-card__cta {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.84rem;
  font-weight: 600;
  color: var(--color-accent);
  letter-spacing: 0.03em;
  transition: gap 0.25s ease;
}
.proyecto-card:hover .proyecto-card__cta { gap: 11px; }

@media (hover: none) {
  .proyecto-card__hover-indicator { display: none; }
  .proyecto-card__body { border-top-color: var(--color-accent); }
}

/* ============================================================
   POR QUÉ ELEGIRNOS
   ============================================================ */
.porque { background: var(--color-accent); }

.porque .section__header { margin-bottom: 64px; }

.porque__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 40px;
}

.porque-item { text-align: center; }

.porque-item__icon {
  width: 72px;
  height: 72px;
  background: rgba(17,24,39,0.12);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 24px;
}
.porque-item__icon svg {
  width: 34px;
  height: 34px;
  stroke: var(--color-dark);
}

.porque-item h3 {
  font-family: var(--font-heading);
  font-size: 1.2rem;
  color: var(--color-dark);
  margin-bottom: 12px;
}
.porque-item p {
  font-size: 0.92rem;
  color: rgba(17,24,39,0.76);
  line-height: 1.68;
}

/* ============================================================
   CONTACTO
   ============================================================ */
.contacto { background: var(--color-dark); }

.contacto__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 88px;
  align-items: start;
}

.contacto__info .section__title { margin-top: 14px; margin-bottom: 22px; text-align: left; }

.contacto__desc {
  color: var(--color-text-light);
  margin-bottom: 36px;
  line-height: 1.75;
  font-size: 1.02rem;
}

.contacto__data {
  display: flex;
  flex-direction: column;
  gap: 18px;
}
.contacto__data li {
  display: flex;
  align-items: center;
  gap: 16px;
  color: rgba(255,255,255,0.82);
  font-size: 0.97rem;
}
.contacto__data a:hover { color: var(--color-accent); }

.contacto__data-icon {
  width: 44px;
  height: 44px;
  background: rgba(137,180,232,0.1);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.contacto__data-icon svg {
  width: 20px;
  height: 20px;
  stroke: var(--color-accent);
}

/* Form */
.contacto__form {
  background: var(--color-dark-2);
  border: 1px solid rgba(255,255,255,0.07);
  border-radius: var(--radius);
  padding: 52px 44px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 22px;
}
.form-group label {
  font-size: 0.85rem;
  font-weight: 500;
  color: rgba(255,255,255,0.7);
}
.form-group input,
.form-group textarea {
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--radius-sm);
  padding: 13px 16px;
  color: var(--color-white);
  font-family: var(--font-body);
  font-size: 0.95rem;
  transition: border-color var(--transition);
}
.form-group input::placeholder,
.form-group textarea::placeholder { color: rgba(255,255,255,0.28); }
.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-accent);
}

.form-note {
  margin-top: 14px;
  font-size: 0.78rem;
  color: var(--color-text-light);
  text-align: center;
}

/* ============================================================
   FOOTER
   ============================================================ */
.footer {
  background: #0b1120;
  color: rgba(255,255,255,0.6);
  padding-top: 72px;
}

.footer__inner {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1.5fr;
  gap: 56px;
  padding-bottom: 56px;
  border-bottom: 1px solid rgba(255,255,255,0.07);
}

.footer__logo {
  height: 88px;
  width: auto;
  margin-bottom: 18px;
  object-fit: contain;
  filter: brightness(0) invert(1);
}

.footer__brand p {
  font-size: 0.9rem;
  line-height: 1.65;
  max-width: 240px;
}

.footer__nav {
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding-top: 10px;
}
.footer__nav a {
  font-size: 0.92rem;
  color: rgba(255,255,255,0.6);
  transition: color var(--transition);
}
.footer__nav a:hover { color: var(--color-accent); }

.footer__contact {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding-top: 10px;
}
.footer__contact a,
.footer__contact span {
  font-size: 0.9rem;
  color: rgba(255,255,255,0.6);
  transition: color var(--transition);
}
.footer__contact a:hover { color: var(--color-accent); }

.footer__bottom {
  text-align: center;
  padding: 22px 24px;
  font-size: 0.78rem;
  color: rgba(255,255,255,0.28);
}

/* ============================================================
   WHATSAPP FLOTANTE
   ============================================================ */
.whatsapp-float {
  position: fixed;
  bottom: 30px;
  right: 30px;
  z-index: 998;
  width: 60px;
  height: 60px;
  background: #25D366;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 6px 24px rgba(37,211,102,0.5);
  transition: transform var(--transition), box-shadow var(--transition);
}
.whatsapp-float svg {
  width: 32px;
  height: 32px;
  fill: var(--color-white);
}
.whatsapp-float:hover {
  transform: scale(1.12);
  box-shadow: 0 10px 32px rgba(37,211,102,0.65);
}

/* ============================================================
   LIGHTBOX
   ============================================================ */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 2000;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}
.lightbox.open {
  opacity: 1;
  pointer-events: all;
}

.lightbox__backdrop {
  position: absolute;
  inset: 0;
  background: rgba(7,10,18,0.96);
  backdrop-filter: blur(6px);
}

.lightbox__close {
  position: absolute;
  top: 20px;
  right: 24px;
  z-index: 10;
  width: 44px;
  height: 44px;
  background: rgba(255,255,255,0.1);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-white);
  transition: background var(--transition);
}
.lightbox__close:hover { background: rgba(255,255,255,0.22); }
.lightbox__close svg { width: 20px; height: 20px; stroke: currentColor; }

.lightbox__body {
  position: relative;
  z-index: 5;
  display: flex;
  align-items: center;
  gap: 16px;
  width: 100%;
  max-width: 900px;
  padding: 0 16px;
}

.lightbox__stage {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 0;
}
.lightbox__stage img {
  max-height: 60vh;
  max-width: 100%;
  width: auto;
  height: auto;
  object-fit: contain;
  border-radius: var(--radius);
  box-shadow: 0 24px 80px rgba(0,0,0,0.6);
  transition: opacity 0.25s ease;
}
.lightbox__stage img.fading { opacity: 0; }

.lightbox__nav {
  width: 48px;
  height: 48px;
  background: rgba(255,255,255,0.12);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-white);
  flex-shrink: 0;
  transition: background var(--transition), transform var(--transition);
}
.lightbox__nav:hover { background: var(--color-accent); transform: scale(1.08); }
.lightbox__nav svg { width: 22px; height: 22px; stroke: currentColor; }

.lightbox__footer {
  position: relative;
  z-index: 5;
  margin-top: 24px;
  text-align: center;
  padding: 0 24px;
  width: 100%;
  max-width: 900px;
}

.lightbox__info {
  margin-bottom: 16px;
}
.lightbox__cat {
  display: block;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 6px;
}
.lightbox__name {
  display: block;
  font-family: var(--font-heading);
  font-size: 1.5rem;
  color: var(--color-white);
  margin-bottom: 10px;
}
.lightbox__desc {
  font-size: 0.9rem;
  color: rgba(255,255,255,0.65);
  line-height: 1.65;
  max-width: 600px;
  margin: 0 auto;
}

.lightbox__dots {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-top: 16px;
}
.lightbox__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: rgba(255,255,255,0.3);
  border: none;
  cursor: pointer;
  transition: background var(--transition), transform var(--transition);
  padding: 0;
}
.lightbox__dot.active {
  background: var(--color-accent);
  transform: scale(1.3);
}

.lightbox__counter {
  display: block;
  margin-top: 10px;
  font-size: 0.8rem;
  color: rgba(255,255,255,0.38);
}

/* ============================================================
   SCROLL ANIMATIONS
   ============================================================ */
.fade-up {
  opacity: 0;
  transform: translateY(32px);
  transition: opacity 0.75s ease, transform 0.75s ease;
}
.fade-up.visible {
  opacity: 1;
  transform: translateY(0);
}

.reveal {
  opacity: 0;
  transform: translateY(36px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.reveal--right { transform: translateX(36px); }
.reveal.visible {
  opacity: 1;
  transform: translate(0);
}

/* Staggered cards */
.servicio-card.reveal:nth-child(2) { transition-delay: 0.1s; }
.servicio-card.reveal:nth-child(3) { transition-delay: 0.2s; }
.servicio-card.reveal:nth-child(4) { transition-delay: 0.3s; }

.proyecto-card.reveal:nth-child(2) { transition-delay: 0.08s; }
.proyecto-card.reveal:nth-child(3) { transition-delay: 0.16s; }
.proyecto-card.reveal:nth-child(4) { transition-delay: 0.08s; }
.proyecto-card.reveal:nth-child(5) { transition-delay: 0.16s; }
.proyecto-card.reveal:nth-child(6) { transition-delay: 0.24s; }

.porque-item.reveal:nth-child(2) { transition-delay: 0.1s; }
.porque-item.reveal:nth-child(3) { transition-delay: 0.2s; }
.porque-item.reveal:nth-child(4) { transition-delay: 0.3s; }

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 1100px) {
  .porque__grid { grid-template-columns: repeat(2, 1fr); }
  .nosotros__grid { gap: 56px; }
  .contacto__grid { gap: 56px; }
}

@media (max-width: 768px) {
  :root { --container: 100%; }
  .container { padding: 0 20px; }
  .section { padding: 80px 0; }

  /* Nav mobile */
  .nav { height: 72px; }
  .nav__links {
    position: fixed;
    top: 72px; left: 0; right: 0;
    flex-direction: column;
    background: rgba(17,24,39,0.98);
    backdrop-filter: blur(10px);
    padding: 28px 24px;
    gap: 22px;
    transform: translateY(-110%);
    transition: transform var(--transition);
    border-bottom: 1px solid rgba(255,255,255,0.08);
  }
  .nav__links.open { transform: translateY(0); }
  .nav__link { font-size: 1.05rem; color: var(--color-white); }
  .nav__cta { display: none; }
  .nav__hamburger { display: flex; }

  /* Hero */
  .hero { min-height: 100svh; }
  .hero__title { font-size: 2.8rem; }

  /* Nosotros */
  .nosotros__grid { grid-template-columns: 1fr; gap: 48px; }
  .nosotros__image img { height: 340px; }
  .nosotros__image-badge { display: none; }
  .stat__number { font-size: 2.4rem; }

  /* Servicios */
  .servicios__grid { grid-template-columns: 1fr; }
  .servicio-card { padding: 36px 28px; }

  /* Proyectos */
  .proyectos__grid { grid-template-columns: repeat(2, 1fr); gap: 18px; }

  /* Porque */
  .porque__grid { grid-template-columns: repeat(2, 1fr); gap: 32px; }

  /* Contacto */
  .contacto__grid { grid-template-columns: 1fr; gap: 52px; }
  .contacto__form { padding: 36px 24px; }

  /* Footer */
  .footer__inner { grid-template-columns: 1fr; gap: 36px; }

  /* Lightbox */
  .lightbox__body { flex-direction: column; gap: 12px; }
  .lightbox__nav--prev { order: 2; }
  .lightbox__stage { order: 1; }
  .lightbox__nav--next { order: 3; }
  .lightbox__body { flex-direction: row; }
  .lightbox__stage img { max-height: 52vh; }
}

@media (max-width: 480px) {
  .hero__title { font-size: 2.2rem; }
  .hero__actions { flex-direction: column; }
  .hero__actions .btn { width: 100%; justify-content: center; }

  .proyectos__grid { grid-template-columns: 1fr; gap: 20px; }
  .porque__grid { grid-template-columns: 1fr; }

  .nosotros__stats { flex-wrap: wrap; }
  .stat { flex: 0 0 calc(50% - 8px); }
  .stat + .stat::before { display: none; }

  .lightbox__name { font-size: 1.2rem; }
  .lightbox__nav { width: 38px; height: 38px; }
}