/* ====================================
   CSS CUSTOM PROPERTIES
   ==================================== */
:root {
  --color-bg:        #0D0D0D;
  --color-surface:   #141414;
  --color-surface-2: #1C1C1C;
  --color-gold:      #C8A96E;
  --color-gold-light:#E2C98A;
  --color-white:     #F8F5F0;
  --color-gray:      #A0A0A0;
  --color-wood:      #8C6E4A;
  --color-border:    #2A2A2A;

  --font-heading: 'Fraunces', Georgia, serif;
  --font-body:    'Hanken Grotesk', system-ui, sans-serif;

  --transition: 0.3s ease;
  --transition-slow: 0.6s ease;

  --max-w: 1280px;
  --pad:   1.5rem;
}

/* ====================================
   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);
  background-color: var(--color-bg);
  color: var(--color-white);
  line-height: 1.75;
  overflow-x: hidden;
}

img { max-width: 100%; display: block; }
a   { text-decoration: none; color: inherit; }
ul  { list-style: none; }

/* ====================================
   TYPOGRAPHY
   ==================================== */
h1, h2, h3 {
  font-family: var(--font-heading);
  font-weight: 400;
  line-height: 1.15;
  color: var(--color-white);
}
h1 { font-size: clamp(2.8rem, 6vw,   5.5rem); }
h2 { font-size: clamp(2rem,   4vw,   3.5rem); }
h3 { font-size: clamp(1.3rem, 2.5vw, 1.8rem); }

p  { font-size: 1rem; line-height: 1.75; color: var(--color-gray); }

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

.overline {
  font-family: var(--font-body);
  font-weight: 500;
  font-size: 0.72rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-gold);
  display: block;
  margin-bottom: 0.75rem;
}
.overline--lg {
  font-size: 0.92rem;
  letter-spacing: 0.18em;
}

.section-divider {
  width: 60px;
  height: 1px;
  background-color: var(--color-gold);
  margin: 1.5rem auto;
}
.section-divider.left { margin-left: 0; }

.section-header        { text-align: center; margin-bottom: 4rem; }
.section-header h2     { margin-bottom: 0; }

.section-intro {
  max-width: 680px;
  margin: 1rem auto 0;
  text-align: center;
}

/* ====================================
   LAYOUT
   ==================================== */
.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--pad);
}

.section { padding: 8.5rem 0 6rem; }
.hero    { padding: 7.5rem 0 6rem; } /* hero maneja su propio espaciado interno */

/* ====================================
   BUTTONS
   ==================================== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.85rem 2rem;
  font-family: var(--font-body);
  font-weight: 500;
  font-size: 0.8rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  border-radius: 8px;
  border: none;
  cursor: pointer;
  transition: var(--transition);
  white-space: nowrap;
}

.btn-primary {
  background-color: var(--color-gold);
  color: #0D0D0D;
}
.btn-primary:hover  { background-color: var(--color-gold-light); transform: scale(1.02); }
.btn-primary:active { transform: scale(0.98); }

.btn-outline {
  background-color: transparent;
  color: var(--color-gold);
  border: 1px solid var(--color-gold);
}
.btn-outline:hover { background-color: rgba(200,169,110,0.1); }

.btn-sm   { padding: 0.55rem 1.2rem; font-size: 0.75rem; }
.btn-full { width: 100%; justify-content: center; }

.btn-whatsapp {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.85rem 2rem;
  background-color: #25D366;
  color: #fff;
  border-radius: 8px;
  font-family: var(--font-body);
  font-weight: 500;
  font-size: 0.8rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  transition: var(--transition);
}
.btn-whatsapp:hover { background-color: #1ebe59; transform: scale(1.02); }
.btn-whatsapp.btn-full { width: 100%; justify-content: center; margin-top: 1.5rem; }

/* ====================================
   PRELOADER
   ==================================== */
#preloader {
  position: fixed;
  inset: 0;
  background-color: var(--color-bg);
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: opacity 0.7s ease, visibility 0.7s ease;
}
#preloader.loaded { opacity: 0; visibility: hidden; }

.preloader-content { text-align: center; display: flex; flex-direction: column; align-items: center; }
.preloader-logo-img { width: min(300px, 72vw); height: auto; mix-blend-mode: screen; }

.preloader-logo {
  font-family: var(--font-heading);
  font-size: 2.8rem;
  font-weight: 600;
  color: var(--color-gold);
  letter-spacing: 0.25em;
  display: block;
  margin-bottom: 2rem;
}

.preloader-bar {
  width: 180px;
  height: 1px;
  background-color: var(--color-border);
  margin: 0 auto;
  overflow: hidden;
}
.preloader-fill {
  height: 100%;
  width: 0;
  background-color: var(--color-gold);
  animation: fillBar 1.5s ease forwards;
}
@keyframes fillBar { to { width: 100%; } }

/* ====================================
   HEADER
   ==================================== */
#header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  padding: 0.6rem 0;
  background-color: rgba(13,13,13,0.97);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--color-border);
  transition: padding var(--transition);
}
#header.scrolled {
  padding: 0.4rem 0;
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

.nav-logo {
  display: flex;
  align-items: center;
  flex-shrink: 0;
  position: relative;
}
.nav-logo-img {
  height: 58px;
  width: auto;
  display: block;
}
.nav-logo { min-width: 0; }

.nav-menu {
  display: flex;
  align-items: center;
  gap: 0;
  flex: 1;
  justify-content: center;
}

.nav-link {
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: rgba(248,245,240,0.8);
  padding: 0.5rem 0.7rem;
  transition: color var(--transition);
}
.nav-link:hover,
.nav-link.active { color: var(--color-gold); }

.nav-cta { flex-shrink: 0; }

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.4rem;
  margin-left: auto;
}
.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-white);
  transition: var(--transition);
}
.hamburger.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.active span:nth-child(2) { opacity: 0; transform: scaleX(0); }
.hamburger.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.mobile-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.6);
  z-index: 999;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition), visibility var(--transition);
}
.mobile-overlay.active { opacity: 1; visibility: visible; }

/* ====================================
   HERO
   ==================================== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  will-change: transform;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(13,13,13,0.88) 0%, rgba(13,13,13,0.38) 100%);
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 780px;
  padding-top: 8rem;
}
.hero-content h1      { color: var(--color-white); margin-bottom: 1.5rem; }
.hero-subtitle        { font-size: 1.05rem; color: rgba(248,245,240,0.82); max-width: 520px; margin-bottom: 1.8rem; }

.hero-proof {
  display: flex;
  align-items: center;
  gap: 1.2rem;
  margin-bottom: 2.2rem;
  flex-wrap: wrap;
}
.proof-item {
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
}
.proof-val {
  font-family: var(--font-heading);
  font-size: 1.3rem;
  font-weight: 600;
  color: var(--color-white);
  line-height: 1;
}
.proof-lab {
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-gray);
}
.proof-sep {
  width: 1px;
  height: 2rem;
  background: rgba(248,245,240,0.15);
}

.hero-buttons         { display: flex; gap: 1rem; flex-wrap: wrap; }

.scroll-indicator {
  position: absolute;
  bottom: 2.5rem;
  left: 50%;
  transform: translateX(-50%);
  color: var(--color-gold);
  font-size: 1.1rem;
  z-index: 1;
  animation: bounceDown 1.8s ease infinite;
}
@keyframes bounceDown {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50%       { transform: translateX(-50%) translateY(9px); }
}

/* ====================================
   NOSOTROS
   ==================================== */
.nosotros { background-color: var(--color-surface); }

.nosotros-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 4rem;
  align-items: center;
}

.nosotros-text p { margin-bottom: 1rem; }

.metrics {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  margin-top: 2.5rem;
  padding-top: 2rem;
  border-top: 1px solid var(--color-border);
}
.metric           { text-align: center; }
.metric-number    {
  display: block;
  font-family: var(--font-heading);
  font-size: 2rem;
  font-weight: 600;
  margin-bottom: 0.3rem;
}
.metric-number i  { font-size: 1.6rem; }
.metric-title     {
  display: block;
  font-family: var(--font-body);
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--color-white);
  letter-spacing: 0.05em;
  margin-bottom: 0.2rem;
}
.metric-label     {
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  color: var(--color-gray);
  display: block;
}

/* Decorative corner frame */
.image-frame { position: relative; }
.image-frame::before,
.image-frame::after {
  content: '';
  position: absolute;
  width: 40px;
  height: 40px;
  border-color: var(--color-gold);
  border-style: solid;
  z-index: 1;
}
.image-frame::before { top: -12px; left: -12px; border-width: 2px 0 0 2px; }
.image-frame::after  { bottom: -12px; right: -12px; border-width: 0 2px 2px 0; }
.image-frame img     { width: 100%; height: 440px; object-fit: cover; }

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

.servicios-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  margin-bottom: 2.5rem;
}

.service-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 2rem 1.5rem;
  transition: border-color var(--transition), transform var(--transition), box-shadow var(--transition);
  position: relative;
  overflow: hidden;
}
.service-card::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 2px;
  background-color: var(--color-gold);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition);
}
.service-card:hover {
  border-color: var(--color-gold);
  transform: translateY(-6px);
  box-shadow: 0 8px 40px rgba(200,169,110,0.15);
}
.service-card:hover::after { transform: scaleX(1); }

.service-icon {
  font-size: 2rem;
  color: var(--color-gold);
  margin-bottom: 1.25rem;
}
.service-card h3 {
  font-family: var(--font-heading);
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--color-white);
  margin-bottom: 0.75rem;
}
.service-card p {
  font-size: 0.875rem;
  line-height: 1.65;
}

.servicios-cta {
  text-align: center;
  padding: 3rem 2rem;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 12px;
}
.servicios-cta p {
  color: var(--color-white);
  font-size: 1rem;
  margin-bottom: 1.5rem;
}

/* ====================================
   MATERIALES
   ==================================== */
.materiales { background-color: var(--color-surface); }

.materiales-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 1rem;
  margin-bottom: 2.5rem;
}

.material-item {
  position: relative;
  overflow: hidden;
  border-radius: 8px;
  aspect-ratio: 3/4;
  cursor: pointer;
}
.material-item img {
  width: 100%; height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}
.material-item:hover img { transform: scale(1.08); }

.material-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(13,13,13,0.96) 0%, rgba(13,13,13,0.15) 60%, transparent 100%);
  opacity: 0;
  transition: opacity var(--transition);
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 1.2rem;
}
.material-item:hover .material-overlay { opacity: 1; }

.material-overlay h3 {
  font-family: var(--font-heading);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-gold);
  margin-bottom: 0.35rem;
}
.material-overlay p {
  font-size: 0.72rem;
  color: var(--color-white);
  opacity: 0.85;
  line-height: 1.45;
}

.materiales-footer {
  text-align: center;
  font-style: italic;
  color: var(--color-gray);
  font-size: 0.9rem;
}

/* ====================================
   PROCESO
   ==================================== */
.proceso { background-color: var(--color-bg); }

.timeline {
  display: flex;
  position: relative;
  gap: 0;
}
.timeline::before {
  content: '';
  position: absolute;
  top: 2.5rem; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(to right, var(--color-gold), var(--color-gold-light), var(--color-gold));
  z-index: 0;
}

.timeline-item {
  flex: 1;
  position: relative;
  padding: 5.5rem 1rem 0;
  text-align: center;
  z-index: 1;
}

.timeline-number {
  position: absolute;
  top: 0; left: 50%;
  transform: translateX(-50%);
  width: 5rem; height: 5rem;
  background-color: var(--color-bg);
  border: 2px solid var(--color-gold);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--color-gold);
}

.timeline-content h3 {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-white);
  margin-bottom: 0.75rem;
}
.timeline-content p { font-size: 0.85rem; line-height: 1.65; }

/* ====================================
   PROYECTOS
   ==================================== */
.proyectos { background-color: var(--color-surface); overflow: hidden; }

.project-block { margin-bottom: 5rem; }
.project-block:last-child { margin-bottom: 0; }

.project-block-header {
  display: flex;
  align-items: center;
  gap: 1.2rem;
  margin-bottom: 1.5rem;
}
.project-block-line {
  width: 3rem;
  height: 2px;
  background: var(--color-gold);
  flex-shrink: 0;
}
.project-block-meta .project-tag {
  display: block;
  margin-bottom: 0.2rem;
}
.project-block-meta h3 {
  font-family: var(--font-heading);
  font-size: 1.9rem;
  font-weight: 600;
  color: var(--color-white);
  margin-bottom: 0.2rem;
  line-height: 1.1;
}
.project-location {
  font-size: 0.72rem;
  color: var(--color-gray);
  letter-spacing: 0.08em;
}
.project-location i { margin-right: 0.3rem; color: var(--color-gold); font-size: 0.65rem; }

.project-comparisons-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin: 2rem 0 1.25rem;
}
.project-comparisons-header::before,
.project-comparisons-header::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--color-border);
}
.project-comparisons-header span {
  font-family: var(--font-body);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-gray);
  white-space: nowrap;
}

.project-images-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.9rem;
}

.project-card {
  position: relative;
  border-radius: 10px;
  overflow: hidden;
  aspect-ratio: 4 / 3;
  cursor: pointer;
}
.project-images-grid--portrait .project-card {
  aspect-ratio: 3 / 4;
}

.project-card img {
  width: 100%; height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
  display: block;
}
.project-card:hover img { transform: scale(1.05); }

.project-info {
  position: absolute;
  bottom: 0; left: 0; right: 0;
  padding: 1.5rem 1.1rem 0.9rem;
  background: linear-gradient(to top, rgba(13,13,13,0.92) 0%, rgba(13,13,13,0) 100%);
  opacity: 0;
  transform: translateY(6px);
  transition: opacity 0.3s ease, transform 0.3s ease;
}
.project-card:hover .project-info {
  opacity: 1;
  transform: translateY(0);
}

.project-tag {
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-gold);
  display: block;
  margin-bottom: 0.35rem;
}
.project-material { font-size: 0.78rem; color: rgba(248,245,240,0.8); }

.proyectos-swiper .swiper-button-prev,
.proyectos-swiper .swiper-button-next {
  color: var(--color-gold);
  background-color: rgba(13,13,13,0.75);
  border: 1px solid var(--color-gold);
  width: 3rem; height: 3rem;
  border-radius: 50%;
  transition: background-color var(--transition);
}
.proyectos-swiper .swiper-button-prev:hover,
.proyectos-swiper .swiper-button-next:hover { background-color: rgba(200,169,110,0.15); }
.proyectos-swiper .swiper-button-prev::after,
.proyectos-swiper .swiper-button-next::after { font-size: 0.9rem; font-weight: 700; }

.proyectos-swiper .swiper-pagination-bullet        { background-color: var(--color-gold); opacity: 0.35; }
.proyectos-swiper .swiper-pagination-bullet-active { opacity: 1; }

/* ====================================
   ANTES/DESPUÉS
   ==================================== */
.antes-despues { background-color: var(--color-bg); }

.comparisons-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
  align-items: start;
}

img-comparison-slider {
  --divider-width: 2px;
  --divider-color: rgba(255,255,255,0.9);
  border-radius: 8px;
  overflow: hidden;
  width: 100%;
  display: block;
  aspect-ratio: 4 / 3;
}
img-comparison-slider img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.comparison-handle {
  width: 2.5rem; height: 2.5rem;
  background-color: var(--color-gold);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #0D0D0D;
  font-size: 0.85rem;
  box-shadow: 0 2px 12px rgba(0,0,0,0.4);
}

.comparison-labels {
  display: flex;
  justify-content: space-between;
  margin-top: 0.6rem;
}
.label-before { font-size: 0.68rem; font-weight: 500; letter-spacing: 0.12em; text-transform: uppercase; color: var(--color-gray); }
.label-after  { font-size: 0.68rem; font-weight: 500; letter-spacing: 0.12em; text-transform: uppercase; color: var(--color-gold); }
.comparison-caption { font-size: 0.82rem; color: var(--color-gray); margin-top: 0.6rem; font-style: italic; text-align: center; }

.single-comparison {
  max-width: 620px;
  margin: 0 auto;
}
.single-comparison img-comparison-slider {
  aspect-ratio: 4 / 3;
  border-radius: 10px;
}

/* Billy: before cuadrada (1067×1086) en container 4:3 → 166px overflow vertical
   object-position 10% sube el crop para alinear el techo con los focos del after */
.billy-before { object-position: center 10%; }
/* Franz: contenedor 5:3 → ambas fotos (4:3) tienen 90px overflow vertical
   → object-position Y funciona correctamente sin transform.
   Antes: dintel a 121px en imagen escalada → clip 58px → visible a 17.5% del top
   Después: dintel a 63px → clip 0px → visible a 17.5% del top  */
.single-comparison--franz img-comparison-slider {
  aspect-ratio: 5 / 3;
}
.franz-before { object-position: center 65%; }
.franz-after  { object-position: center 0%; }

.single-comparison .comparison-labels {
  margin-top: 0.75rem;
}
.single-comparison .comparison-caption {
  margin-top: 0.4rem;
}

.project-separator {
  display: flex;
  align-items: center;
  gap: 1.2rem;
  margin: 3.5rem 0 2.5rem;
  color: var(--color-gray);
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  white-space: nowrap;
}
.project-separator .separator-line {
  flex: 1;
  height: 1px;
  background: rgba(255,255,255,0.12);
}

.process-gallery { margin-top: 3.5rem; }
.process-gallery-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}
.process-photo {
  border-radius: 8px;
  overflow: hidden;
  aspect-ratio: 4 / 3;
}
.process-photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.45s ease;
}
.process-photo:hover img { transform: scale(1.05); }

.process-video-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
  margin-top: 1rem;
}
.process-video {
  border-radius: 8px;
  overflow: hidden;
  aspect-ratio: 9 / 16;
  background: #000;
}
.process-video video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

/* ====================================
   TESTIMONIOS
   ==================================== */
.testimonios { background-color: var(--color-surface); }

.testimonios-swiper { padding-bottom: 3.5rem !important; }

.testimonial-card {
  background-color: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 2.5rem;
  height: 100%;
}

.testimonial-quote {
  font-size: 2.8rem;
  color: var(--color-gold);
  opacity: 0.45;
  line-height: 1;
  margin-bottom: 1rem;
}
.testimonial-card p {
  font-size: 0.95rem;
  color: rgba(248,245,240,0.85);
  line-height: 1.8;
  margin-bottom: 1.5rem;
  font-style: italic;
}
.testimonial-stars {
  display: flex;
  gap: 0.2rem;
  color: var(--color-gold);
  font-size: 0.85rem;
  margin-bottom: 1.25rem;
}
.testimonial-author strong { display: block; color: var(--color-white); font-size: 0.9rem; margin-bottom: 0.2rem; }
.testimonial-author span   { font-size: 0.78rem; color: var(--color-gray); }

.testimonios-swiper .swiper-pagination-bullet        { background-color: var(--color-gold); opacity: 0.35; }
.testimonios-swiper .swiper-pagination-bullet-active { opacity: 1; }

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

.contacto-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 5rem;
  align-items: start;
}

.contacto-form { position: relative; min-height: 200px; }

.form-group  { margin-bottom: 1.25rem; }
.form-row    { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }

label {
  display: block;
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-gray);
  margin-bottom: 0.5rem;
}

input, select, textarea {
  width: 100%;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 0.85rem 1rem;
  color: var(--color-white);
  font-family: var(--font-body);
  font-size: 0.9rem;
  transition: border-color var(--transition), box-shadow var(--transition);
  outline: none;
  appearance: none;
}
input:focus, select:focus, textarea:focus {
  border-color: var(--color-gold);
  box-shadow: 0 0 0 3px rgba(200,169,110,0.1);
}
select option { background-color: var(--color-surface-2); }
textarea { resize: vertical; min-height: 110px; }

input::placeholder, textarea::placeholder { color: rgba(160,160,160,0.5); }

.file-input { display: none; }
.file-label {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.2rem;
  background-color: var(--color-surface);
  border: 1px dashed var(--color-border);
  border-radius: 8px;
  cursor: pointer;
  font-size: 0.82rem;
  color: var(--color-gray);
  transition: border-color var(--transition), color var(--transition);
}
.file-label:hover { border-color: var(--color-gold); color: var(--color-gold); }

.form-success {
  position: absolute;
  inset: 0;
  background-color: rgba(13,13,13,0.97);
  border: 1px solid var(--color-gold);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.4s ease, visibility 0.4s ease;
}
.form-success.visible       { opacity: 1; visibility: visible; }
.success-content            { text-align: center; }
.success-content i          { font-size: 3rem; color: #4CAF50; margin-bottom: 1rem; }
.success-content h3         { font-family: var(--font-heading); font-size: 2.2rem; color: var(--color-white); margin-bottom: 0.5rem; }
.success-content p          { color: var(--color-gray); }

/* Contact info column */
.contacto-info { padding-top: 0.25rem; }

.contact-item {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  margin-bottom: 1.75rem;
}
.contact-icon {
  width: 2.5rem; height: 2.5rem;
  flex-shrink: 0;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-gold);
  font-size: 1.1rem;
}
.contact-label {
  display: block;
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-gray);
  margin-bottom: 0.2rem;
}
.contact-value { font-size: 0.95rem; color: var(--color-white); transition: color var(--transition); }
a.contact-value:hover { color: var(--color-gold); }

/* ====================================
   CTA FINAL
   ==================================== */
.cta-final {
  background-color: var(--color-surface);
  border-top: 1px solid var(--color-gold);
  padding: 6rem 0;
  text-align: center;
}
.cta-final h2      { margin-bottom: 1.25rem; }
.cta-final > .container > p { max-width: 560px; margin: 0 auto 2.5rem; font-size: 1rem; }
.cta-buttons       { display: flex; gap: 1rem; justify-content: center; flex-wrap: wrap; }

/* ====================================
   FOOTER
   ==================================== */
.footer { background-color: #0A0A0A; border-top: 1px solid var(--color-gold); }

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 3rem;
  padding-top: 4rem;
  padding-bottom: 4rem;
}

.footer-brand {
  display: flex;
  align-items: center;
}
.footer-logo-img {
  width: min(240px, 68vw);
  height: auto;
  display: block;
  mix-blend-mode: screen;
  margin-left: -9px;
}

.footer-logo {
  font-family: var(--font-heading);
  font-size: 1.35rem;
  font-weight: 600;
  color: var(--color-gold);
  letter-spacing: 0.12em;
  display: block;
  margin-bottom: 1rem;
}
.footer-brand p { font-size: 0.875rem; line-height: 1.7; max-width: 300px; }

.footer-nav h4, .footer-services h4, .footer-contact h4 {
  font-family: var(--font-body);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-gold);
  margin-bottom: 1.25rem;
}
.footer-nav ul li, .footer-services ul li { margin-bottom: 0.55rem; }
.footer-nav ul li a, .footer-services ul li a {
  font-size: 0.875rem;
  color: var(--color-gray);
  transition: color var(--transition);
}
.footer-nav ul li a:hover, .footer-services ul li a:hover { color: var(--color-gold); }

.footer-social { display: flex; gap: 0.6rem; flex-wrap: wrap; }
.footer-social a {
  width: 2.25rem; height: 2.25rem;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-gray);
  font-size: 1rem;
  transition: color var(--transition), border-color var(--transition);
}
.footer-social a:hover { color: var(--color-gold); border-color: var(--color-gold); }

.footer-bottom {
  border-top: 1px solid var(--color-border);
  padding: 1.5rem var(--pad);
}
.footer-bottom .container { display: flex; justify-content: center; }
.footer-bottom p           { font-size: 0.78rem; }

/* ====================================
   SECTION SWITCHING
   ==================================== */

/* Scroll offset: compensa header fijo + barra de tabs */
section[id] { scroll-margin-top: 130px; }

/* Tab indicator en la nav */
.nav-link.active { color: var(--color-gold) !important; opacity: 1 !important; }

/* Indicador visual del tab activo debajo del link */
.nav-link.active::after {
  content: '';
  display: block;
  height: 2px;
  background-color: var(--color-gold);
  border-radius: 1px;
  margin-top: 2px;
}

/* Tabs de sección: barra de navegación secundaria visible en desktop */
.section-tabs {
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  position: fixed;
  top: 79px;
  left: 0; right: 0;
  z-index: 900;
  overflow-x: auto;
  scrollbar-width: none;
}
.section-tabs::-webkit-scrollbar { display: none; }

.section-tabs-inner {
  display: flex;
  justify-content: center;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--pad);
}

.tab-btn {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 1rem 1.1rem;
  font-family: var(--font-body);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-gray);
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  cursor: pointer;
  white-space: nowrap;
  transition: color var(--transition), border-color var(--transition);
  margin-bottom: -1px;
}
.tab-btn i { font-size: 0.85rem; }
.tab-btn:hover { color: var(--color-white); }
.tab-btn.active {
  color: var(--color-gold);
  border-bottom-color: var(--color-gold);
}

/* ====================================
   WHATSAPP FLOAT
   ==================================== */
.whatsapp-float {
  position: fixed;
  bottom: 2rem; right: 2rem;
  width: 3.5rem; height: 3.5rem;
  background-color: #25D366;
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.75rem;
  z-index: 900;
  transition: transform var(--transition), box-shadow var(--transition);
  animation: pulseWA 2.2s ease infinite;
}
.whatsapp-float:hover { transform: scale(1.1); animation: none; box-shadow: 0 6px 30px rgba(37,211,102,0.55); }

@keyframes pulseWA {
  0%, 100% { box-shadow: 0 4px 18px rgba(37,211,102,0.35); }
  50%       { box-shadow: 0 4px 28px rgba(37,211,102,0.6), 0 0 0 8px rgba(37,211,102,0.1); }
}

/* ====================================
   RESPONSIVE — 1280px
   ==================================== */
@media (max-width: 1280px) {
  .servicios-grid  { grid-template-columns: repeat(4, 1fr); }
  .materiales-grid { grid-template-columns: repeat(4, 1fr); }
}

/* ====================================
   NAVEGACIÓN: desktop usa section-tabs / mobile usa hamburger+panel
   ==================================== */

/* Desktop: ocultar nav-menu y hamburger (section-tabs es la nav) */
@media (min-width: 1025px) {
  .nav-menu  { display: none !important; }
  .hamburger { display: none !important; }
}

/* Mobile: ocultar section-tabs (hamburger abre el panel lateral) */
@media (max-width: 1024px) {
  .section-tabs { display: none !important; }
}

/* ====================================
   RESPONSIVE — 1024px
   ==================================== */
@media (max-width: 1024px) {
  /* Mobile nav panel */
  .nav-menu {
    position: fixed;
    top: 0; right: -320px;
    width: 300px;
    height: 100vh;
    background-color: var(--color-surface);
    flex-direction: column;
    justify-content: center;
    align-items: flex-start;
    gap: 0.25rem;
    padding: 2rem;
    z-index: 1001;
    transition: right 0.35s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    border-left: 1px solid var(--color-border);
  }
  .nav-menu.open { right: 0; }
  .nav-link      { font-size: 1rem; padding: 0.75rem 0.5rem; }
  .nav-cta       { display: none; }
  .hamburger     { display: flex; }

  /* Layout */
  .nosotros-grid { grid-template-columns: 1fr; gap: 3rem; }
  .metrics       { grid-template-columns: repeat(2, 1fr); }

  .servicios-grid  { grid-template-columns: repeat(2, 1fr); }
  .materiales-grid { grid-template-columns: repeat(3, 1fr); }

  /* Vertical timeline */
  .timeline         { flex-direction: column; gap: 2rem; }
  .timeline::before { top: 0; bottom: 0; left: 2.5rem; right: auto; width: 2px; height: auto; }
  .timeline-item    { padding: 0 0 0 6rem; text-align: left; padding-top: 0; }
  .timeline-number  { left: 0; top: 50%; transform: translateY(-50%); width: 5rem; height: 5rem; }

  .comparisons-grid { grid-template-columns: 1fr; }

  .contacto-grid { grid-template-columns: 1fr; gap: 3rem; }

  .footer-grid { grid-template-columns: repeat(2, 1fr); }

  /* Hero + nav */
  .hero-content  { padding-top: 6.5rem; }
  .nav-logo-img  { height: 44px; }
  .nosotros-grid { gap: 2.5rem; }

}

/* ====================================
   RESPONSIVE — 768px
   ==================================== */
@media (max-width: 768px) {
  .section        { padding: 4.5rem 0; }
  .section-header { margin-bottom: 2.5rem; }

  .servicios-grid  { grid-template-columns: 1fr 1fr; }
  .materiales-grid { grid-template-columns: repeat(2, 1fr); }
  .metrics         { grid-template-columns: repeat(2, 1fr); }

  .form-row     { grid-template-columns: 1fr; }
  .cta-buttons  { flex-direction: column; align-items: center; }
  .hero-buttons { flex-direction: column; align-items: flex-start; }

  .comparisons-grid     { grid-template-columns: repeat(2, 1fr); }
  .process-gallery-grid { grid-template-columns: 1fr; }
  .process-video-grid   { grid-template-columns: repeat(2, 1fr); }
  .project-separator    { white-space: normal; text-align: center; flex-wrap: wrap; }
  .project-images-grid  { grid-template-columns: repeat(2, 1fr); }

  .footer-grid { grid-template-columns: 1fr; gap: 2rem; padding-top: 3rem; padding-bottom: 3rem; }

  /* Hero */
  .hero-content  { padding-top: 5rem; }
  .hero-subtitle { font-size: 0.95rem; max-width: 100%; }
  .nosotros-grid { gap: 2rem; }

  /* Cards portrait → landscape en mobile */
  .project-images-grid--portrait .project-card { aspect-ratio: 4 / 3; }

  /* WhatsApp float más pequeño */
  .whatsapp-float { bottom: 1.5rem; right: 1.5rem; width: 3rem; height: 3rem; font-size: 1.5rem; }

  /* CTA final */
  .cta-final { padding: 3.5rem 0; }
}

/* ====================================
   RESPONSIVE — 480px
   ==================================== */
@media (max-width: 480px) {
  :root { --pad: 1rem; }

  .servicios-grid  { grid-template-columns: 1fr; }
  .materiales-grid { grid-template-columns: 1fr 1fr; }
  .image-frame img { height: 320px; }

  .project-images-grid  { grid-template-columns: 1fr; }
  .testimonios-swiper .swiper-slide { width: 90vw; }

  .timeline-number { width: 4rem; height: 4rem; font-size: 1.2rem; }
  .timeline::before { left: 2rem; }
  .timeline-item    { padding-left: 5rem; }

  /* Hero + nav */
  .hero-content  { padding-top: 4rem; }
  .nav-logo-img  { height: 36px; }
  .hero-subtitle { font-size: 0.88rem; }
  .proof-sep     { display: none; }

  /* Secciones */
  .section        { padding: 3.5rem 0; }
  .section-header { margin-bottom: 1.5rem; }



  /* CTA + WhatsApp */
  .cta-final      { padding: 2.5rem 0; }
  .whatsapp-float { bottom: 1rem; right: 1rem; width: 2.75rem; height: 2.75rem; font-size: 1.35rem; }
}

/* ====================================
   RESPONSIVE — 360px (teléfonos pequeños)
   ==================================== */
@media (max-width: 360px) {
  .nav-logo-img  { height: 30px; }
  .hero-content  { padding-top: 3.5rem; }
  .hero-proof    { gap: 0.6rem; }
  .proof-sep     { display: none; }
}