/* ============================================================
   TECHNICAL SERVICES RB — Hoja de estilos principal
   Versión: v3
   Estrategia: mobile-first
   ============================================================ */

/* ------------------------------------------------------------
   Variables CSS — única fuente de verdad para el sistema de diseño
   La paleta corporativa (primary/accent/accent2/bg/text/border) se
   mantiene intacta; los tokens derivados solo ajustan contraste.
   ------------------------------------------------------------ */
:root {
  /* Colores — paleta corporativa Technical Services RB (sin cambios) */
  --color-primary:   #1a1a1a;          /* Negro grafito (fondo oscuro) */
  --color-accent:    #8db600;          /* Verde oliva brillante (acento marca) */
  --color-accent2:   #d4e600;          /* Amarillo lima (segundo acento) */
  --color-bg:        #f5f5f5;          /* Fondo claro */
  --color-text:      #1a1a1a;          /* Texto principal */
  --color-text-inv:  #ffffff;          /* Texto sobre fondos oscuros */
  --color-border:    #cccccc;          /* Bordes y separadores */

  /* Derivados de marca — mismos tonos, ajustados solo para contraste AA */
  --color-accent-dark:    #5c7600;               /* verde de marca oscurecido: texto/iconos sobre fondo claro (AA) */
  --color-accent-soft:    rgba(141, 182, 0, .12); /* halo/hover sutil sobre superficies claras */
  --color-accent-soft-dark: rgba(141, 182, 0, .16);
  --color-surface:        #ffffff;
  --color-text-muted:     rgba(26, 26, 26, .64);
  --color-text-inv-muted: rgba(255, 255, 255, .72);

  /* Tipografía */
  --font-heading:    'Montserrat', system-ui, sans-serif;
  --font-body:       'Open Sans', system-ui, sans-serif;

  /* Espaciado */
  --space-md:  2rem;
  --space-lg:  3rem;
  --space-xl:  clamp(3.5rem, 6vw + 1rem, 7.5rem);

  /* Elevación y forma */
  --shadow-card:       0 1px 2px rgba(0, 0, 0, .04), 0 2px 8px rgba(0, 0, 0, .04), 0 12px 28px rgba(0, 0, 0, .08);
  --shadow-card-hover: 0 2px 4px rgba(0, 0, 0, .06), 0 6px 16px rgba(0, 0, 0, .08), 0 24px 48px rgba(0, 0, 0, .14);
  --shadow-dark-card:  0 1px 2px rgba(0, 0, 0, .3), 0 4px 12px rgba(0, 0, 0, .25), 0 16px 40px rgba(0, 0, 0, .4);
  --lift-card: -6px;
  --radius-sm: 10px;
  --radius:    16px;
  --radius-lg: 22px;
  --container: 1160px;

  /* Animación */
  --transition:      .22s cubic-bezier(.4, 0, .2, 1);
  --transition-slow: .5s cubic-bezier(.16, 1, .3, 1);
}

/* ------------------------------------------------------------
   Reset básico — box-sizing universal
   ------------------------------------------------------------ */
*,
*::before,
*::after {
  box-sizing: border-box;
}

/* ------------------------------------------------------------
   1. Estilos globales
   ------------------------------------------------------------ */
html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  color: var(--color-text);
  background-color: var(--color-bg);
  margin: 0;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  font-family: var(--font-heading);
  line-height: 1.15;
  letter-spacing: -.01em;
  margin: 0;
}

p {
  margin: 0;
}

a {
  color: inherit;
}

img {
  max-width: 100%;
  display: block;
}

::selection {
  background: var(--color-accent);
  color: var(--color-primary);
}

:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
  border-radius: 4px;
}

.icon {
  width: 1em;
  height: 1em;
  flex-shrink: 0;
}

/* Chino — fuentes del sistema (sin webfont extra, evita descargar
   varios MB de glifos CJK); Montserrat/Open Sans no incluyen chino. */
html[lang="zh"] body {
  font-family: 'PingFang SC', 'Microsoft YaHei', 'Heiti SC', 'Noto Sans CJK SC', var(--font-body);
}

html[lang="zh"] h1,
html[lang="zh"] h2,
html[lang="zh"] h3,
html[lang="zh"] h4,
html[lang="zh"] .btn,
html[lang="zh"] .eyebrow,
html[lang="zh"] .nav-logo-text,
html[lang="zh"] .nav-links a,
html[lang="zh"] .service-name,
html[lang="zh"] .footer-heading,
html[lang="zh"] .indicator-number,
html[lang="zh"] .hero-stat-num {
  font-family: 'PingFang SC', 'Microsoft YaHei', 'Heiti SC', 'Noto Sans CJK SC', var(--font-heading);
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *, *::before, *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
    scroll-behavior: auto !important;
  }
}

/* ------------------------------------------------------------
   2. Utilidades y layout compartido
   ------------------------------------------------------------ */
.section-wrapper {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 1.5rem;
}

main section {
  padding: var(--space-xl) 0;
}

#inicio {
  padding: 0;
}

.section-head {
  text-align: center;
  max-width: 640px;
  margin: 0 auto clamp(2.5rem, 4vw, var(--space-lg));
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  font-family: var(--font-heading);
  font-size: .78rem;
  font-weight: 700;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--color-accent-dark);
  margin-bottom: .9rem;
}

.eyebrow::before {
  content: '';
  display: inline-block;
  width: 22px;
  height: 2px;
  background: currentColor;
  border-radius: 1px;
}

#servicios .eyebrow,
#contacto .eyebrow {
  color: var(--color-accent);
}

.section-title {
  font-size: clamp(2rem, 1.4vw + 1.6rem, 2.85rem);
  font-weight: 800;
  letter-spacing: -.015em;
  color: var(--color-primary);
}

#servicios .section-title,
#contacto .section-title {
  color: #ffffff;
}

.section-head .section-title::after {
  content: '';
  display: block;
  width: 52px;
  height: 3px;
  margin: 1.1rem auto 0;
  background: var(--color-accent);
  border-radius: 2px;
}

.section-subtitle {
  margin-top: 1rem;
  color: var(--color-text-muted);
  font-size: 1.08rem;
  line-height: 1.6;
}

#servicios .section-subtitle,
#contacto .section-subtitle {
  color: var(--color-text-inv-muted);
}

.lead-paragraph {
  text-align: center;
  max-width: 680px;
  margin: 0 auto clamp(2.5rem, 4vw, var(--space-lg));
  color: var(--color-text-muted);
  font-size: 1.08rem;
  line-height: 1.75;
}

/* Scroll-reveal — fade-in discreto al entrar en viewport (ver main.v3.js) */
.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity var(--transition-slow), transform var(--transition-slow);
}

.reveal.in-view {
  opacity: 1;
  transform: none;
}

/* ------------------------------------------------------------
   3. Sistema de botones
   ------------------------------------------------------------ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .5rem;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: .95rem;
  letter-spacing: .01em;
  line-height: 1;
  text-decoration: none;
  border: 2px solid transparent;
  border-radius: var(--radius-sm);
  padding: .95rem 1.75rem;
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition), background-color var(--transition), border-color var(--transition), color var(--transition);
  white-space: nowrap;
}

.btn .icon {
  width: 18px;
  height: 18px;
  transition: transform var(--transition);
}

.btn:hover .icon {
  transform: translateX(3px);
}

.btn-primary {
  background: var(--color-accent);
  color: var(--color-primary);
  box-shadow: 0 1px 2px rgba(0, 0, 0, .06), 0 3px 8px rgba(141, 182, 0, .18), 0 10px 24px rgba(141, 182, 0, .22);
}

.btn-primary:hover {
  background: var(--color-accent-dark);
  color: #ffffff;
  transform: translateY(-3px);
  box-shadow: 0 2px 4px rgba(0, 0, 0, .08), 0 6px 14px rgba(141, 182, 0, .22), 0 18px 34px rgba(141, 182, 0, .28);
}

.btn-primary:active {
  transform: translateY(-1px) scale(.98);
  box-shadow: 0 1px 2px rgba(0, 0, 0, .08);
}

.btn-ghost {
  background: transparent;
  color: var(--color-text-inv);
  border-color: rgba(255, 255, 255, .3);
}

.btn-ghost:hover {
  border-color: var(--color-text-inv);
  background: rgba(255, 255, 255, .08);
  transform: translateY(-3px);
}

.btn-ghost:active {
  transform: translateY(-1px) scale(.98);
}

.btn-submit {
  width: 100%;
}

.btn:disabled,
.btn-submit:disabled {
  opacity: .6;
  cursor: not-allowed;
  transform: none !important;
}

/* ------------------------------------------------------------
   4. Nav
   ------------------------------------------------------------ */
#nav {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: rgba(26, 26, 26, 0.92);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transition: background-color var(--transition), box-shadow var(--transition);
}

#nav.scrolled {
  background: rgba(20, 20, 20, 0.97);
  box-shadow: 0 2px 20px rgba(0, 0, 0, .35);
}

.nav-inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  min-height: 64px;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: .6rem;
  text-decoration: none;
  padding: .6rem 0;
}

.nav-logo-mark {
  height: 32px;
  width: auto;
  transition: transform var(--transition);
}

.nav-logo:hover .nav-logo-mark {
  transform: scale(1.08) rotate(-4deg);
}

.nav-logo-text {
  font-family: var(--font-heading);
  color: #ffffff;
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: -.01em;
  white-space: nowrap;
}

.nav-logo-text strong {
  color: var(--color-accent);
  font-weight: 800;
}

/* Checkbox oculto */
#nav-check {
  display: none;
}

/* Botón hamburguesa — visible solo en móvil (área táctil 44x44) */
#nav-toggle {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  cursor: pointer;
  transition: opacity var(--transition);
}

#nav-toggle:hover {
  opacity: .7;
}

#nav-toggle span {
  display: block;
  height: 2px;
  width: 26px;
  margin: 0 auto;
  background: #ffffff;
  border-radius: 2px;
  transition: var(--transition);
}

/* Links — ocultos en móvil por defecto */
.nav-links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: none;
  width: 100%;
  background: #161616;
  flex-direction: column;
}

.nav-links li {
  border-top: 1px solid rgba(255, 255, 255, .08);
}

.nav-links a {
  color: #ffffff;
  text-decoration: none;
  display: block;
  padding: 1rem .25rem;
  font-size: 1rem;
  font-weight: 600;
  transition: var(--transition);
}

.nav-links a:hover,
.nav-links a.active-link {
  color: var(--color-accent);
  padding-left: .5rem;
}

/* Mostrar menú cuando checkbox está marcado */
#nav-check:checked ~ .nav-links {
  display: flex;
}

/* Transformar hamburguesa en X cuando está abierto */
#nav-check:checked ~ label#nav-toggle span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
#nav-check:checked ~ label#nav-toggle span:nth-child(2) {
  opacity: 0;
}
#nav-check:checked ~ label#nav-toggle span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Desktop — nav horizontal */
@media (min-width: 768px) {
  #nav-toggle {
    display: none;
  }

  .nav-links {
    display: flex !important;
    flex-direction: row;
    width: auto;
    background: transparent;
    gap: .5rem;
    align-items: center;
  }

  .nav-links li {
    border-top: none;
  }

  .nav-links a {
    padding: .5rem .75rem;
    border-radius: var(--radius-sm);
    font-size: .92rem;
  }

  .nav-links a:hover,
  .nav-links a.active-link {
    padding-left: .75rem;
    background: rgba(255, 255, 255, .06);
  }

  .nav-links .nav-cta {
    background: var(--color-accent);
    color: var(--color-primary);
    margin-left: .5rem;
    padding: .55rem 1.25rem;
  }

  .nav-links .nav-cta:hover {
    background: var(--color-accent-dark);
    color: #ffffff;
    padding-left: 1.25rem;
  }
}

/* ------------------------------------------------------------
   4.1 Selector de idioma (ES / EN / ZH)
   ------------------------------------------------------------ */
.lang-switch {
  display: flex;
  justify-content: center;
  padding: 1rem .25rem;
}

.lang-select-wrap {
  /* Grid en vez de flex: los 3 hijos comparten la misma celda (1/1),
     así el <select> puede cubrir toda la caja —clic en cualquier punto,
     no solo sobre el texto—. El padding vive en el <select> (ver abajo),
     no aquí, para que no quede un anillo muerto sin responder al clic. */
  position: relative;
  display: inline-grid;
  align-items: center;
  border: 1.5px solid rgba(255, 255, 255, .18);
  border-radius: var(--radius-sm);
  color: var(--color-text-inv-muted);
  transition: var(--transition);
}

.lang-select-wrap:hover,
.lang-select-wrap:focus-within {
  color: #ffffff;
  border-color: rgba(255, 255, 255, .4);
}

.lang-globe-icon,
.lang-caret-icon,
.lang-select {
  grid-area: 1 / 1;
}

.lang-globe-icon,
.lang-caret-icon {
  width: 15px;
  height: 15px;
  flex-shrink: 0;
  pointer-events: none;
}

.lang-globe-icon {
  justify-self: start;
  margin-left: .7rem;
}

.lang-caret-icon {
  justify-self: end;
  margin-right: .7rem;
}

.lang-select {
  width: 100%;
  height: 100%;
  appearance: none;
  -webkit-appearance: none;
  background: transparent;
  border: none;
  color: inherit;
  font-family: var(--font-heading);
  font-size: .8rem;
  font-weight: 700;
  letter-spacing: .02em;
  text-align: center;
  cursor: pointer;
  padding: .5rem 1.9rem;
}

.lang-select:focus-visible {
  outline: none;
}

.lang-select option {
  color: var(--color-text);
  background: #ffffff;
}

@media (min-width: 768px) {
  .lang-switch {
    padding: 0;
    margin-left: .75rem;
  }

  /* En el nav de escritorio, junto a botones sin marco: se quita el
     borde y se iguala al tratamiento hover de .nav-links a para que
     no se sienta más "grande" o distinto que sus vecinos. */
  .lang-select-wrap {
    border-color: transparent;
  }

  .lang-select-wrap:hover,
  .lang-select-wrap:focus-within {
    border-color: transparent;
    background: rgba(255, 255, 255, .06);
  }
}

/* ------------------------------------------------------------
   5. Hero (#inicio)
   ------------------------------------------------------------ */
#inicio {
  position: relative;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  background: linear-gradient(150deg, #1a1a1a 0%, #232900 55%, #17190a 100%);
  overflow: hidden;
}

.hero-grid {
  max-width: var(--container);
  margin: 0 auto;
  width: 100%;
  padding: calc(64px + var(--space-xl)) 1.5rem var(--space-xl);
  display: grid;
  gap: var(--space-lg);
  align-items: center;
}

@media (min-width: 900px) {
  .hero-grid {
    grid-template-columns: 1.05fr .95fr;
    gap: var(--space-md);
  }
}

.hero-content {
  text-align: center;
}

@media (min-width: 900px) {
  .hero-content {
    text-align: left;
  }
}

#inicio .eyebrow {
  color: var(--color-accent2);
}

#inicio h1 {
  color: #ffffff;
  font-size: clamp(2.75rem, 3vw + 2rem, 4.5rem);
  font-weight: 800;
  letter-spacing: -.025em;
  line-height: 1.08;
}

.hero-subtitle {
  color: var(--color-text-inv-muted);
  font-size: 1.22rem;
  line-height: 1.65;
  margin: 1.5rem 0 0;
  max-width: 46ch;
}

@media (min-width: 900px) {
  .hero-subtitle {
    margin-left: 0;
    margin-right: 0;
  }
}

.hero-content .hero-subtitle {
  margin-left: auto;
  margin-right: auto;
}

@media (min-width: 900px) {
  .hero-content .hero-subtitle {
    margin-left: 0;
    margin-right: 0;
  }
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-top: 2.25rem;
  justify-content: center;
}

@media (min-width: 900px) {
  .hero-actions {
    justify-content: flex-start;
  }
}

.hero-actions .btn-primary {
  padding: 1.05rem 2rem;
  font-size: 1rem;
}

/* Panel visual del Hero — composición de marca (sin fotografía) */
.hero-visual {
  position: relative;
  display: none;
  height: 380px;
  border-radius: var(--radius-lg);
  border: 1px solid rgba(255, 255, 255, .1);
  background: linear-gradient(155deg, rgba(255, 255, 255, .05), rgba(255, 255, 255, .01));
  overflow: hidden;
}

@media (min-width: 900px) {
  .hero-visual {
    display: block;
  }
}

.hero-visual-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, .06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, .06) 1px, transparent 1px);
  background-size: 32px 32px;
  mask-image: radial-gradient(ellipse at center, #000 45%, transparent 85%);
}

.hero-visual-glow {
  position: absolute;
  width: 280px;
  height: 280px;
  right: -60px;
  top: -60px;
  background: radial-gradient(circle, rgba(141, 182, 0, .35), transparent 70%);
  filter: blur(10px);
}

.hero-mark {
  position: absolute;
  inset: 0;
  margin: auto;
  width: 62%;
  max-width: 260px;
  height: auto;
  opacity: .9;
  filter: drop-shadow(0 20px 40px rgba(0, 0, 0, .45));
}

.hero-stat-row {
  position: absolute;
  left: var(--space-md);
  right: var(--space-md);
  bottom: var(--space-md);
  display: flex;
  justify-content: space-between;
  background: rgba(20, 20, 20, .55);
  border: 1px solid rgba(255, 255, 255, .12);
  border-radius: var(--radius-sm);
  padding: 1rem .5rem;
  backdrop-filter: blur(6px);
}

.hero-stat {
  flex: 1;
  text-align: center;
  border-right: 1px solid rgba(255, 255, 255, .12);
}

.hero-stat:last-child {
  border-right: none;
}

.hero-stat-num {
  display: block;
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 1.4rem;
  color: var(--color-accent2);
}

.hero-stat-label {
  display: block;
  font-size: .72rem;
  color: var(--color-text-inv-muted);
  text-transform: uppercase;
  letter-spacing: .04em;
  margin-top: .15rem;
}

.hero-scroll-hint {
  position: relative;
  margin: 0 auto var(--space-md);
  color: var(--color-text-inv-muted);
  animation: hero-bounce 2.2s ease-in-out infinite;
  transition: color var(--transition);
}

.hero-scroll-hint:hover {
  color: var(--color-accent2);
}

.hero-scroll-hint .icon {
  width: 22px;
  height: 22px;
}

@keyframes hero-bounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(6px); }
}

/* ------------------------------------------------------------
   6. Sobre Nosotros (#nosotros)
   ------------------------------------------------------------ */
.indicators-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

@media (min-width: 768px) {
  .indicators-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.indicator {
  text-align: center;
  padding: 2.5rem 1.75rem;
  background: var(--color-surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
  border: 1px solid rgba(0, 0, 0, .04);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.indicator:hover {
  transform: translateY(var(--lift-card));
  box-shadow: var(--shadow-card-hover);
  border-color: rgba(141, 182, 0, .25);
}

.indicator-icon-wrap {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 52px;
  height: 52px;
  border-radius: var(--radius-sm);
  background: var(--color-accent-soft);
  color: var(--color-accent-dark);
  margin-bottom: 1.15rem;
  transition: transform var(--transition), background-color var(--transition);
}

.indicator:hover .indicator-icon-wrap {
  background: var(--color-accent-soft-dark);
  transform: scale(1.06);
}

.indicator-icon {
  width: 26px;
  height: 26px;
}

.indicator-number {
  font-family: var(--font-heading);
  font-size: 2.65rem;
  color: var(--color-accent-dark);
  font-weight: 800;
  letter-spacing: -.02em;
  font-variant-numeric: tabular-nums;
}

.indicator-label {
  color: var(--color-text-muted);
  margin-top: .4rem;
  font-weight: 600;
  font-size: .95rem;
}

/* ------------------------------------------------------------
   7. Servicios (#servicios)
   ------------------------------------------------------------ */
#servicios {
  background: var(--color-primary);
}

.services-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  counter-reset: service-count;
}

@media (min-width: 768px) {
  .services-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .services-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.service-card {
  position: relative;
  background: rgba(255, 255, 255, .04);
  border: 1px solid rgba(255, 255, 255, .1);
  border-radius: var(--radius);
  padding: 2.25rem 2rem 2rem;
  counter-increment: service-count;
  overflow: hidden;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition), background-color var(--transition);
}

.service-card::before {
  content: counter(service-count, decimal-leading-zero);
  position: absolute;
  top: 1.35rem;
  right: 1.5rem;
  font-family: var(--font-heading);
  font-size: .78rem;
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--color-text-inv-muted);
  opacity: .55;
  transition: color var(--transition), opacity var(--transition);
}

.service-card::after {
  content: '';
  position: absolute;
  inset: 0 auto auto 0;
  width: 100%;
  height: 3px;
  background: var(--color-accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-slow);
}

.service-card:hover {
  background: rgba(141, 182, 0, .1);
  border-color: rgba(141, 182, 0, .5);
  transform: translateY(var(--lift-card));
  box-shadow: var(--shadow-dark-card);
}

.service-card:hover::before {
  color: var(--color-accent2);
  opacity: 1;
}

.service-card:hover::after {
  transform: scaleX(1);
}

.service-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 52px;
  height: 52px;
  border-radius: var(--radius-sm);
  background: rgba(141, 182, 0, .14);
  color: var(--color-accent);
  margin-bottom: 1.25rem;
  transition: transform var(--transition), background-color var(--transition);
}

.service-icon .icon {
  width: 26px;
  height: 26px;
}

.service-card:hover .service-icon {
  background: var(--color-accent);
  color: var(--color-primary);
  transform: scale(1.06);
}

.service-name {
  font-family: var(--font-heading);
  font-size: 1.05rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: .6rem;
}

.service-desc {
  font-size: .92rem;
  color: var(--color-text-inv-muted);
  line-height: 1.6;
}

/* ------------------------------------------------------------
   8. Galería de Proyectos (#proyectos)
   ------------------------------------------------------------ */
.gallery-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}

@media (min-width: 768px) {
  .gallery-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .gallery-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.gallery-item {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-card);
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition);
}

.gallery-item:hover {
  transform: translateY(var(--lift-card));
  box-shadow: var(--shadow-card-hover);
}

.gallery-img {
  width: 100%;
  height: 240px;
  object-fit: cover;
  display: block;
  transition: transform var(--transition-slow);
}

.gallery-item:hover .gallery-img {
  transform: scale(1.06);
}

.gallery-overlay {
  position: absolute;
  inset: auto 0 0 0;
  pointer-events: none;
  display: flex;
  align-items: center;
  gap: .6rem;
  padding: 2.5rem 1.25rem 1rem;
  background: linear-gradient(to top, rgba(10, 10, 10, .85), rgba(10, 10, 10, 0));
  color: #ffffff;
}

.gallery-overlay .icon {
  width: 20px;
  height: 20px;
  color: var(--color-accent2);
  flex-shrink: 0;
}

.gallery-overlay span {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: .92rem;
  letter-spacing: .01em;
}

/* ------------------------------------------------------------
   8b. FAQ
   ------------------------------------------------------------ */
.faq-list {
  max-width: 760px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.faq-item {
  background: var(--color-surface);
  border: 1px solid rgba(0, 0, 0, .08);
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
  overflow: hidden;
  transition: box-shadow var(--transition), border-color var(--transition);
}

.faq-item[open] {
  box-shadow: var(--shadow-card-hover);
  border-color: var(--color-accent-soft-dark);
}

.faq-question {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.25rem 1.5rem;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.02rem;
  color: var(--color-text);
}

.faq-question::-webkit-details-marker {
  display: none;
}

.faq-question::after {
  content: '';
  flex-shrink: 0;
  width: 10px;
  height: 10px;
  border-right: 2px solid var(--color-accent-dark);
  border-bottom: 2px solid var(--color-accent-dark);
  transform: rotate(45deg);
  transition: transform var(--transition);
}

.faq-item[open] .faq-question::after {
  transform: rotate(-135deg);
}

.faq-question:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: -2px;
}

.faq-answer {
  padding: 0 1.5rem 1.25rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* ------------------------------------------------------------
   9. Lightbox
   ------------------------------------------------------------ */
#lightbox {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, .92);
  z-index: 9000;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}

#lightbox.open {
  display: flex;
}

#lightbox img {
  max-width: 90vw;
  max-height: 90vh;
  border-radius: var(--radius);
  box-shadow: 0 8px 32px rgba(0, 0, 0, .5);
}

#lightbox-close {
  position: absolute;
  top: 1.25rem;
  right: 1.5rem;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #ffffff;
  background: rgba(255, 255, 255, .1);
  border: 1px solid rgba(255, 255, 255, .2);
  border-radius: 50%;
  cursor: pointer;
  transition: var(--transition);
}

#lightbox-close:hover {
  background: var(--color-accent);
  color: var(--color-primary);
  border-color: var(--color-accent);
}

#lightbox-close .icon {
  width: 20px;
  height: 20px;
}

/* ------------------------------------------------------------
   10. Formulario de cotización (#cotizacion)
   ------------------------------------------------------------ */
.form-container {
  max-width: 760px;
  margin: 0 auto;
}

.form-card {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card-hover);
  border: 1px solid rgba(0, 0, 0, .05);
  padding: clamp(1.75rem, 4vw, 3.25rem);
}

.form-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0 1.25rem;
}

@media (min-width: 640px) {
  .form-row {
    grid-template-columns: 1fr 1fr;
  }
}

.form-group {
  margin-bottom: 1.4rem;
}

label {
  display: block;
  margin-bottom: .5rem;
  font-weight: 600;
  color: var(--color-text);
  font-size: .9rem;
  letter-spacing: .01em;
}

input,
select,
textarea {
  width: 100%;
  min-height: 48px;
  padding: .85rem 1rem;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-size: 1rem;
  color: var(--color-text);
  background: #ffffff;
  transition: border-color var(--transition), box-shadow var(--transition);
}

input:hover,
select:hover,
textarea:hover {
  border-color: #b3b3b3;
}

input:focus,
select:focus,
textarea:focus {
  outline: none;
  border-color: var(--color-accent-dark);
  box-shadow: 0 0 0 4px var(--color-accent-soft);
}

.input-error {
  border-color: #dc3545 !important;
}

.error-msg {
  color: #dc3545;
  font-size: .82rem;
  margin-top: .35rem;
  display: none;
}

.error-msg.visible {
  display: block;
}

textarea {
  resize: vertical;
  min-height: 130px;
}

.checkbox-group {
  display: flex;
  align-items: flex-start;
  gap: .75rem;
}

.checkbox-group input[type="checkbox"] {
  width: auto;
  margin-top: .2rem;
  flex-shrink: 0;
  accent-color: var(--color-accent-dark);
}

.checkbox-label {
  display: inline;
  font-weight: 400;
  margin-bottom: 0;
}

.inline-link {
  color: var(--color-accent-dark);
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 2px;
}

.btn-submit {
  padding: 1.05rem;
  font-size: 1.05rem;
  margin-top: .5rem;
}

.form-feedback {
  margin-top: 1.25rem;
  padding: 1rem 1.25rem;
  border-radius: var(--radius-sm);
  display: none;
  align-items: center;
  justify-content: center;
  gap: .6rem;
  text-align: center;
  font-weight: 600;
}

.form-feedback .icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
}

.form-feedback.success {
  display: flex;
  background: #e7f5e0;
  color: #3f6b00;
  border: 1px solid #cbe8b5;
}

.form-feedback.error {
  display: flex;
  background: #fbe4e6;
  color: #8f1d29;
  border: 1px solid #f3c3c8;
}

.turnstile-wrapper {
  margin-bottom: 1.4rem;
}

/* ------------------------------------------------------------
   11. Contacto (#contacto)
   ------------------------------------------------------------ */
#contacto {
  background: #111111;
  color: #ffffff;
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

@media (min-width: 768px) {
  .contact-grid {
    grid-template-columns: 1fr 1fr;
  }
}

.contact-info {
  background: rgba(255, 255, 255, .03);
  border: 1px solid rgba(255, 255, 255, .08);
  border-radius: var(--radius);
  padding: 2rem;
  box-shadow: var(--shadow-dark-card);
}

.contact-info h3 {
  font-family: var(--font-heading);
  color: #ffffff;
  margin-bottom: 1.5rem;
  font-size: 1.15rem;
}

.contact-item {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.25rem;
}

.contact-item:last-child {
  margin-bottom: 0;
}

.contact-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  background: rgba(141, 182, 0, .16);
  color: var(--color-accent);
  flex-shrink: 0;
}

.contact-icon .icon {
  width: 18px;
  height: 18px;
}

.contact-map {
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-dark-card);
  min-height: 280px;
}

.contact-map iframe {
  width: 100%;
  height: 100%;
  min-height: 280px;
  border: none;
  display: block;
}

/* ------------------------------------------------------------
   12. Botón flotante WhatsApp
   ------------------------------------------------------------ */
#whatsapp-btn a {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  z-index: 8000;
  width: 58px;
  height: 58px;
  background: #25d366;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 6px 20px rgba(0, 0, 0, .3);
  transition: var(--transition);
  text-decoration: none;
}

#whatsapp-btn a:hover {
  transform: scale(1.08);
  box-shadow: 0 8px 26px rgba(0, 0, 0, .38);
}

#whatsapp-btn svg {
  width: 30px;
  height: 30px;
  fill: #ffffff;
}

/* ------------------------------------------------------------
   13. Footer
   ------------------------------------------------------------ */
footer {
  background: #000000;
  color: var(--color-text-inv-muted);
  padding: var(--space-lg) 1.5rem var(--space-md);
}

.footer-inner {
  max-width: var(--container);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-md);
  padding-bottom: var(--space-md);
  border-bottom: 1px solid rgba(255, 255, 255, .1);
}

@media (min-width: 768px) {
  .footer-inner {
    grid-template-columns: 1.4fr 1fr 1fr;
    gap: var(--space-lg);
  }
}

.footer-brand {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.footer-mark {
  width: 40px;
  height: auto;
  margin-bottom: 1rem;
  opacity: .9;
}

.footer-name {
  font-family: var(--font-heading);
  font-weight: 700;
  color: #ffffff;
  font-size: 1.05rem;
  margin-bottom: .5rem;
}

.footer-tagline {
  font-size: .9rem;
  line-height: 1.6;
  max-width: 32ch;
}

.footer-col {
  display: flex;
  flex-direction: column;
  gap: .75rem;
}

.footer-heading {
  font-family: var(--font-heading);
  font-weight: 700;
  color: #ffffff;
  font-size: .82rem;
  text-transform: uppercase;
  letter-spacing: .06em;
  margin-bottom: .35rem;
}

.footer-col a,
.footer-col span {
  color: var(--color-text-inv-muted);
  text-decoration: none;
  font-size: .92rem;
  transition: color var(--transition), transform var(--transition);
}

.footer-col a {
  display: inline-block;
}

.footer-col a:hover {
  color: var(--color-accent);
  transform: translateX(3px);
}

.footer-bottom {
  max-width: var(--container);
  margin: 0 auto;
  padding-top: var(--space-md);
  display: flex;
  flex-direction: column;
  gap: .75rem;
  align-items: center;
  text-align: center;
  font-size: .85rem;
}

@media (min-width: 640px) {
  .footer-bottom {
    flex-direction: row;
    justify-content: space-between;
    text-align: left;
  }
}

.footer-bottom a {
  color: var(--color-text-inv-muted);
  text-decoration: none;
}

.footer-bottom a:hover {
  color: var(--color-accent);
}