/* ==============================================
   DELTA REFRIGERACIÓN INDUSTRIAL — styles.css
   Versión: 2.0 | Producción
   ============================================== */

/* ==============================================
   1. VARIABLES / TOKENS
      Para cambiar tipografías, editá --font-display
      y --font-body. Solo acá.
   ============================================== */
:root {
  /* Colores */
  --color-bg:          #0a1628;
  --color-bg-alt:      rgba(255, 255, 255, 0.018);
  --color-navy:        #0a1628;
  --color-blue:        #1a6fc4;
  --color-blue-light:  #3b9de0;
  --color-accent:      #00c3ff;
  --color-white:       #f4f8fc;
  --color-gray:        #8a9bb0;
  --color-gray-light:  #e8eef5;
  --color-border:      rgba(255, 255, 255, 0.07);
  --color-border-blue: rgba(0, 195, 255, 0.15);
  --color-blanco:      #fff;

  /* Tipografías
     Para cambiar: reemplazá la URL del @import en el HTML
     y los valores de estas dos variables. */
  --font-display: 'Roboto', sans-serif;
  --font-body:    'Roboto', sans-serif;

  /* Espaciado */
  --space-xs:  0.5rem;
  --space-sm:  1rem;
  --space-md:  1.5rem;
  --space-lg:  2.5rem;
  --space-xl:  4rem;
  --space-2xl: 6rem;

  /* Transiciones */
  --transition: 0.25s ease;

  /* Radio */
  --radius: 4px;

  /* Z-index */
  --z-nav:       100;
  --z-whatsapp:  200;
}

/* ==============================================
   2. RESET GLOBAL
   ============================================== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  /* FIX APPLE: evita zoom automático en inputs */
  -webkit-tap-highlight-color: transparent;
}

body {
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 400;
  line-height: 1.6;
  background-color: var(--color-bg);
  color: var(--color-white);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  /* FIX APPLE: corrige momentum scroll en iOS */
  -webkit-overflow-scrolling: touch;
}

img, svg {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: inherit;
  text-decoration: none;
  /* FIX APPLE: elimina highlight azul al tocar links */
  -webkit-tap-highlight-color: transparent;
}

ul {
  list-style: none;
}

address {
  font-style: normal;
}

/* FIX APPLE: evita zoom al hacer foco en inputs (iOS requiere font-size >= 16px) */
input,
textarea,
select {
  font-size: 16px !important;
  -webkit-appearance: none;
  -moz-appearance: none;
  appearance: none;
  border-radius: 0;
}

/* FIX APPLE: botones sin estilo nativo */
button {
  -webkit-appearance: none;
  appearance: none;
  border-radius: 0;
  cursor: pointer;
}

/* ==============================================
   3. UTILIDADES
   ============================================== */
.container {
  width: 100%;
  max-width: 1140px;
  margin-inline: auto;
  padding-inline: var(--space-lg);
}

.section-label {
  display: block;
  font-family: var(--font-body);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 0.6rem;
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 2.8rem);
  font-weight: 700;
  line-height: 1.05;
  text-transform: uppercase;
  letter-spacing: 0.01em;
  margin-bottom: 1rem;
  color: var(--color-white);
}

.section-body {
  font-size: 0.95rem;
  font-weight: 300;
  color: #e2e9f1;
  line-height: 1.8;
}

/* ==============================================
   4. BOTONES
   ============================================== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  border-radius: var(--radius);
  padding: 0.85rem 1.8rem;
  border: none;
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition), opacity var(--transition), background var(--transition);
  text-decoration: none;
  /* FIX APPLE: asegura área táctil mínima */
  min-height: 44px;
  -webkit-tap-highlight-color: transparent;
}

.btn--primary {
  background: var(--color-accent);
  color: var(--color-navy);
  box-shadow: 0 0 28px rgba(0, 195, 255, 0.18);
}
.btn--primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 40px rgba(0, 195, 255, 0.35);
}

.btn--outline {
  background: transparent;
  color: var(--color-white);
  border: 1px solid rgba(255, 255, 255, 0.22);
}
.btn--outline:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.btn--nav {
  background: var(--color-accent);
  color: var(--color-navy);
  padding: 0.5rem 1.2rem;
  font-size: 0.8rem;
  min-height: 36px;
}
.btn--nav:hover {
  opacity: 0.85;
}

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

/* Estado loading del botón enviar */
.btn--loading .btn-label { opacity: 0.5; }
.btn--loading .btn-icon  { display: none; }

/* ==============================================
   5. LOGO
   ============================================== */
.site-logo {
  height: 36px;
  width: auto;
  object-fit: contain;
}

.site-logo--footer {
  height: 28px;
}

/* ==============================================
   6. HEADER / NAV
   ============================================== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-nav);
  background: rgba(10, 22, 40, 0.92);
  /* FIX APPLE: -webkit-backdrop-filter necesario para Safari */
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(0, 195, 255, 0.07);
  transition: background var(--transition);
}

.site-header.scrolled {
  background: rgba(10, 22, 40, 0.98);
}

.nav-inner {
  max-width: 1140px;
  margin-inline: auto;
  padding: 1.1rem var(--space-lg);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

.nav-logo-link {
  flex-shrink: 0;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2rem;
  flex: 1;
  justify-content: center;
}

.nav-links a {
  font-family: var(--font-body);
  font-size: 0.82rem;
  font-weight: 500;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--color-gray);
  transition: color var(--transition);
}
.nav-links a:hover,
.nav-links a.is-active {
  color: var(--color-accent);
}

/* Burger (mobile) */
.nav-burger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  /* FIX APPLE: área táctil suficiente */
  min-width: 44px;
  min-height: 44px;
  align-items: center;
}
.nav-burger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-white);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}
.nav-burger[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-burger[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-burger[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* Nav mobile drawer */
.nav-mobile {
  display: none;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
  padding: 1.5rem var(--space-lg) 2rem;
  border-top: 1px solid var(--color-border);
  /* FIX APPLE: no bloquea scroll del cuerpo al estar abierto */
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
}
.nav-mobile.is-open {
  display: flex;
}
.nav-mobile ul {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.2rem;
}
.nav-mobile a {
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  transition: color var(--transition);
  /* FIX APPLE: área táctil */
  padding: 6px 0;
  display: inline-block;
}
.nav-mobile a:hover {
  color: var(--color-accent);
}

/* ==============================================
   7. HERO
   ============================================== */
.hero {
  position: relative;
  min-height: 100vh;
  /* FIX APPLE: fill-available para Safari en iOS */
  min-height: -webkit-fill-available;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 8rem var(--space-lg) 4rem;
  overflow: hidden;

  /* Imagen de fondo industrial.
     Para cambiar la imagen, reemplazá assets/hero.webp */
  background:
    linear-gradient(rgba(10, 22, 40, 0.72), rgba(10, 22, 40, 0.5)),
    url('assets/hero1.jpg') center / cover no-repeat;

  /* FIX APPLE: background-attachment:fixed no funciona en iOS */
  background-attachment: scroll;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(26, 111, 196, 0.12) 0%, transparent 55%);
  pointer-events: none;
}

.hero-grid-pattern {
  position: absolute;
  inset: 0;
  opacity: 0.04;
  pointer-events: none;
  background-image:
    linear-gradient(var(--color-accent) 1px, transparent 1px),
    linear-gradient(90deg, var(--color-accent) 1px, transparent 1px);
  background-size: 60px 60px;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 80%;
}

.label-tag {
  display: inline-block;
  font-family: var(--font-body);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-accent);
  border: 1px solid rgba(0, 195, 255, 0.3);
  padding: 0.3rem 0.9rem;
  border-radius: var(--radius);
  margin-bottom: 1.5rem;
  animation: fadeUp 0.6s ease both;
}

.hero h1 {
  font-family: var(--font-display);
  font-size: clamp(2rem, 7vw, 5.5rem);
  font-weight: 900;
  line-height: 0.95;
  text-transform: uppercase;
  letter-spacing: -0.01em;
  margin-bottom: 1.5rem;
  color: var(--color-white);
  animation: fadeUp 0.6s 0.1s ease both;
}

.hero h1 em {
  color: var(--color-accent);
  font-style: normal;
}

.hero p {
  font-size: 1.05rem;
  font-weight: 300;
  color: #e6ecf2;
  line-height: 1.75;
  max-width: 520px;
  margin-bottom: 2.5rem;
  animation: fadeUp 0.6s 0.2s ease both;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  animation: fadeUp 0.6s 0.3s ease both;
}

/* ==============================================
   8. STATS BAR
   ============================================== */
.stats-bar {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  background: rgba(26, 111, 196, 0.07);
  border-top: 1px solid var(--color-border-blue);
  border-bottom: 1px solid var(--color-border-blue);
  padding: 2rem var(--space-lg);
  gap: 1rem;
}

.stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.stat__num {
  font-family: var(--font-display);
  font-size: 2.2rem;
  font-weight: 900;
  line-height: 1;
  color: var(--color-accent);
}

.stat__label {
  font-family: var(--font-body);
  font-size: 0.72rem;
  font-weight: 400;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-gray);
  margin-top: 0.3rem;
}

/* ==============================================
   9. ABOUT / NOSOTROS
   ============================================== */
.about {
  background: var(--color-bg-alt);
  padding: var(--space-2xl) 0;
}

.about__inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
  align-items: center;
}

.about__text .section-body {
  max-width: 100%;
}

.about__quote {
  border-left: 3px solid var(--color-accent);
  padding-left: 1.4rem;
  margin-top: 2rem;
  font-family: var(--font-display);
  font-size: 1.3rem;
  font-weight: 300;
  color: #c8d8e8;
  line-height: 1.45;
}

.about__pillars {
  background: rgba(26, 111, 196, 0.07);
  border: 1px solid var(--color-border-blue);
  border-radius: var(--radius);
  padding: var(--space-lg);
  display: flex;
  flex-direction: column;
  gap: 0;
}

.pillar-item {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  padding: 1.2rem 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}
.pillar-item:last-child {
  border-bottom: none;
  padding-bottom: 0;
}
.pillar-item:first-child {
  padding-top: 0;
}

.pillar-item__icon {
  width: 38px;
  height: 38px;
  flex-shrink: 0;
  background: rgba(0, 195, 255, 0.08);
  border: 1px solid rgba(0, 195, 255, 0.18);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-accent);
  font-size: 1rem;
}

.pillar-item__text h3 {
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-white);
  margin-bottom: 0.25rem;
}

.pillar-item__text p {
  font-size: 0.94rem;
  font-weight: 300;
  color: var(--color-gray);
  line-height: 1.55;
}

/* ==============================================
   10. SERVICIOS
   ============================================== */
.services {
  padding: var(--space-2xl) 0;
  background:
    linear-gradient(rgba(10, 22, 40, 0.72), rgba(10, 22, 40, 0.88)),
    url('assets/servicios.webp') center / cover no-repeat;
  background-attachment: scroll; /* FIX APPLE */
}

.services .section-label,
.services .section-title {
  text-align: left;
}

.services__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.4rem;
  margin-top: var(--space-lg);
}

.service-card {
  background: rgba(16, 21, 48, 0.25);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 2rem;
  position: relative;
  overflow: hidden;
  transition: border-color var(--transition), background var(--transition);
}

.service-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--color-accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition);
}

.service-card:hover {
  border-color: rgba(0, 195, 255, 0.2);
  background: rgba(26, 111, 196, 0.06);
}
.service-card:hover::before {
  transform: scaleX(1);
}

.service-card__icon {
  font-size: 1.8rem;
  color: var(--color-accent);
  margin-bottom: 1.2rem;
}

.service-card h3 {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--color-white);
  margin-bottom: 1rem;
  line-height: 1.2;
}

.service-card ul {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.service-card ul li {
  font-size: 0.94rem;
  font-weight: 300;
  color: #e6ecf2;
  padding: 0.45rem 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
  display: flex;
  align-items: flex-start;
  gap: 0.65rem;
  line-height: 1.4;
}
.service-card ul li:last-child {
  border-bottom: none;
}
.service-card ul li::before {
  content: '';
  width: 4px;
  height: 4px;
  flex-shrink: 0;
  margin-top: 0.42em;
  background: var(--color-accent);
  border-radius: 50%;
}

/* ==============================================
   11. PORTFOLIO / TRABAJOS REALIZADOS
   ============================================== */
.portfolio {
  padding: var(--space-2xl) 0;
  background: var(--color-bg);
}

.portfolio__intro {
  margin-bottom: 0;
  max-width: 560px;
}

.portfolio__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.2rem;
  margin-top: var(--space-lg);
}

/* Card */
.portfolio-card {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  /* FIX APPLE: overflow:hidden + border-radius no siempre funciona en Safari */
  -webkit-mask-image: -webkit-radial-gradient(white, black);
  mask-image: radial-gradient(white, black);
}

/* Contenedor de imagen */
.portfolio-card__img-wrap {
  position: relative;
  width: 100%;
  /* Aspect ratio fijo para las 3 fotos */
  aspect-ratio: 3 / 4;
  overflow: hidden;
}

.portfolio-card__img-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  /* Oscurecimiento base: brightness 70% */
  filter: brightness(0.7);
  transition: filter 0.4s ease, transform 0.4s ease;
  will-change: filter, transform;
}

/* Overlay extra sobre la imagen */
.portfolio-card__overlay {
  position: absolute;
  inset: 0;
  background: rgba(10, 22, 40, 0.35);
  transition: background 0.4s ease;
}

/* Info (título + subtítulo) — aparece en la parte inferior */
.portfolio-card__info {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 1.2rem 1.4rem;
  background: linear-gradient(to top, rgba(10, 22, 40, 0.92) 0%, transparent 100%);
  z-index: 2;
  transition: background 0.4s ease;
}

.portfolio-card__info h3 {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-white);
  margin-bottom: 0.3rem;
  line-height: 1.2;
}

.portfolio-card__info p {
  font-size: 0.8rem;
  font-weight: 300;
  color: rgba(200, 220, 240, 0.85);
  line-height: 1.4;
}

/* ---- HOVER (desktop) ---- */
@media (hover: hover) {
  .portfolio-card:hover .portfolio-card__img-wrap img {
    /* Al hacer hover: aclara la imagen */
    filter: brightness(1);
    transform: scale(1.04);
  }
  .portfolio-card:hover .portfolio-card__overlay {
    background: rgba(10, 22, 40, 0.1);
  }
  .portfolio-card:hover .portfolio-card__info {
    background: linear-gradient(to top, rgba(10, 22, 40, 0.85) 0%, transparent 100%);
  }
}

/* ---- TOUCH (iOS/Android): activa al tocar ---- */
.portfolio-card.is-touched .portfolio-card__img-wrap img {
  filter: brightness(1);
}
.portfolio-card.is-touched .portfolio-card__overlay {
  background: rgba(10, 22, 40, 0.1);
}

/* ==============================================
   12. CLIENTES
   ============================================== */
.clients {
  background: var(--color-blanco);
  padding: var(--space-2xl) 0;
  text-align: center;
}

.clients .section-label,
.clients .section-title {
  text-align: center;
  color: #393737;
}

.clients__grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 1rem 2rem;
  margin-top: var(--space-lg);
}

.client-logo {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem 1.5rem;
  background: rgba(255, 255, 255, 0.01);
  border: 1px solid rgba(255, 255, 255, 0.07);
  border-radius: var(--radius);
  transition: border-color var(--transition), background var(--transition);
}
.client-logo:hover {
  border-color: rgba(0, 195, 255, 0.22);
  background: rgba(255, 255, 255, 0.06);
}

.client-logo img {
  height: 90px;
  width: auto;
  max-width: 140px;
  object-fit: contain;
}

/* ==============================================
   13. CONTACTO
   ============================================== */
.contact {
  padding: var(--space-2xl) 0;
}

.contact__inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xl);
  align-items: start;
}

.contact__list {
  display: flex;
  flex-direction: column;
  margin-top: 2rem;
}

.contact__item {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  padding: 1rem 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}
.contact__item:last-child {
  border-bottom: none;
}

.contact__item-icon {
  width: 40px;
  height: 40px;
  flex-shrink: 0;
  background: rgba(0, 195, 255, 0.07);
  border: 1px solid rgba(0, 195, 255, 0.14);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-accent);
  font-size: 1rem;
}

.contact__item-text span {
  display: block;
  font-size: 0.94rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-gray);
  margin-bottom: 0.2rem;
}

.contact__item-text a,
.contact__item-text p {
  font-size: 0.9rem;
  font-weight: 400;
  color: var(--color-white);
  line-height: 1.5;
  transition: color var(--transition);
  /* FIX APPLE: área táctil mínima en links */
  display: inline-block;
  padding: 2px 0;
}
.contact__item-text a:hover {
  color: var(--color-accent);
}

/* Formulario */
.contact-form {
  display: flex;
  flex-direction: column;
  gap: 1.1rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.form-group label {
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-gray);
}

.contact-form input,
.contact-form textarea {
  font-family: var(--font-body);
  /* font-size mínimo 16px para evitar zoom en iOS */
  font-size: 16px;
  font-weight: 400;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.09);
  border-radius: var(--radius);
  padding: 0.85rem 1rem;
  color: var(--color-white);
  outline: none;
  transition: border-color var(--transition);
  width: 100%;
  /* FIX APPLE: elimina sombra interior en iOS */
  -webkit-appearance: none;
  appearance: none;
}

.contact-form input::placeholder,
.contact-form textarea::placeholder {
  color: rgba(138, 155, 176, 0.5);
}

.contact-form input:focus,
.contact-form textarea:focus {
  border-color: rgba(0, 195, 255, 0.45);
}

.contact-form textarea {
  height: 120px;
  resize: vertical;
  min-height: 100px;
}

/* Estado del formulario (éxito / error) */
.form-status {
  font-size: 0.88rem;
  font-weight: 500;
  padding: 0.75rem 1rem;
  border-radius: var(--radius);
  display: none;
}
.form-status.success {
  display: block;
  background: rgba(0, 195, 100, 0.12);
  border: 1px solid rgba(0, 195, 100, 0.3);
  color: #5effa0;
}
.form-status.error {
  display: block;
  background: rgba(255, 80, 80, 0.1);
  border: 1px solid rgba(255, 80, 80, 0.3);
  color: #ff8a8a;
}

/* ==============================================
   14. FOOTER
   ============================================== */
.site-footer {
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding: 2rem 0;
}

.footer__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

.footer__brand {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  align-items: flex-start;
}

.footer__nav {
  display: flex;
  gap: 1.8rem;
  flex-wrap: wrap;
}

.footer__nav a {
  font-size: 0.75rem;
  font-weight: 400;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--color-gray);
  transition: color var(--transition);
}
.footer__nav a:hover {
  color: var(--color-accent);
}

.footer__copy {
  font-size: 0.7rem;
  color: rgba(138, 155, 176, 0.45);
  width: 100%;
  text-align: right;
}

.site-logo2--footer {
  width: 50%;
  box-sizing: border-box;
  position: inherit;
  margin-left: -4px;
}

/* ==============================================
   15. WHATSAPP STICKY
   ============================================== */
.whatsapp-btn {
  position: fixed;
  bottom: 1.8rem;
  right: 1.8rem;
  z-index: var(--z-whatsapp);

  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: #25D366;
  color: #fff;

  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;

  box-shadow: 0 4px 20px rgba(37, 211, 102, 0.4);
  transition: transform var(--transition), box-shadow var(--transition);
  /* FIX APPLE: tap-highlight */
  -webkit-tap-highlight-color: transparent;
}

.whatsapp-btn:hover {
  transform: translateY(-3px) scale(1.06);
  box-shadow: 0 6px 28px rgba(37, 211, 102, 0.55);
}

/* ==============================================
   16. ANIMACIONES
   ============================================== */
@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(22px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}
.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* ==============================================
   17. RESPONSIVE
   ============================================== */

/* Tablet: ≤ 1024px */
@media (max-width: 1024px) {
  .about__inner {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }

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

  .contact__inner {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }

  .portfolio__grid {
    grid-template-columns: 1fr 1fr 1fr;
    gap: 0.8rem;
  }
}

/* Mobile: ≤ 768px */
@media (max-width: 768px) {
  :root {
    --space-2xl: 4rem;
    --space-xl: 2.5rem;
  }

  .nav-links,
  .btn--nav {
    display: none;
  }

  .nav-burger {
    display: flex;
  }

  .nav-inner {
    padding: 1rem var(--space-md);
  }

  .hero {
    padding: 7rem var(--space-md) 3rem;
    min-height: auto;
  }

  .container {
    padding-inline: var(--space-md);
  }

  .stats-bar {
    padding: 1.4rem var(--space-md);
    grid-template-columns: repeat(3, 1fr);
  }
  .stat__num {
    font-size: 1.6rem;
  }

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

  /* Portfolio: 1 columna en mobile */
  .portfolio__grid {
    grid-template-columns: 1fr;
    gap: 1rem;
  }

  .clients__grid {
    gap: 1rem;
  }

  .footer__inner {
    flex-direction: column;
    align-items: flex-start;
  }
  .footer__copy {
    text-align: left;
  }

  .footer__nav {
    gap: 1.2rem;
  }
}

/* Mobile S: ≤ 420px */
@media (max-width: 420px) {
  .hero-actions {
    flex-direction: column;
  }
  .hero-actions .btn {
    width: 100%;
    justify-content: center;
  }

  .stats-bar {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
}