/* ============================================
   LIC - Limpieza Integral de Construcción
   Variables globales y estilos base
   ============================================ */

:root {
  /* Paleta industrial */
  --color-primario: #2c5282;        /* Azul Acero */
  --color-primario-hover: #1a365d;
  --color-primario-claro: #3182ce;
  --color-grafito: #2d3748;        /* Gris Grafito - texto y fondos secundarios */
  --color-grafito-claro: #4a5568;
  --color-grafito-fondo: #1a202c;
  --color-blanco: #ffffff;
  --color-fondo: #f7fafc;
  --color-fondo-alt: #edf2f7;
  --color-texto: #2d3748;
  --color-texto-suave: #718096;
  --color-borde: #e2e8f0;

  /* Tipografía - Propuesta Magno: Montserrat (principal) + Playfair Display (encabezados) */
  --font-family: 'Montserrat', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-heading: 'Playfair Display', Georgia, serif;
  --font-size-base: 1rem;
  --line-height-base: 1.6;
  --line-height-tight: 1.25;

  /* Espaciado y layout */
  --container-max: 1200px;
  --section-padding-y: 4rem;
  --section-padding-y-lg: 5rem;
  --gap: 1.5rem;
  --radius: 8px;
  --radius-lg: 12px;
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
  --shadow-hover: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);

  /* Transiciones */
  --transition-fast: 0.2s ease;
  --transition: 0.3s ease;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: var(--line-height-base);
  color: var(--color-texto);
  background-color: var(--color-blanco);
  overflow-x: hidden;
  text-align: justify;
}

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

a {
  color: var(--color-primario);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-primario-hover);
}

/* Utilidades */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.25rem;
  padding-right: 1.25rem;
}

/* ============================================
   Header y navegación
   ============================================ */

.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background-color: rgba(242, 242, 240, 0.98);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-borde);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 4rem;
}

.logo {
  display: flex;
  align-items: center;
  background-color: transparent;
}

.logo-img {
  height: 60px;
  width: auto;
  object-fit: contain;
  display: block;
  background-color: transparent;
}

.logo:hover .logo-img {
  opacity: 0.9;
}

.logo-text {
  font-weight: 700;
  font-size: 1.5rem;
  color: var(--color-primario);
  letter-spacing: 0.02em;
}

.nav-list {
  display: flex;
  list-style: none;
  gap: 1.5rem;
}

.nav-link {
  font-weight: 600;
  color: var(--color-grafito);
}

.nav-link:hover {
  color: var(--color-primario);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 2rem;
  height: 2rem;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
  transition: transform var(--transition);
}

.nav-toggle span {
  display: block;
  width: 100%;
  height: 2px;
  background-color: var(--color-grafito);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}

/* Menú móvil */
@media (max-width: 768px) {
  .nav-toggle {
    display: flex;
  }

  .nav-list {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    background-color: var(--color-blanco);
    padding: 1.5rem;
    gap: 0;
    border-bottom: 1px solid var(--color-borde);
    box-shadow: var(--shadow);
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: transform var(--transition), opacity var(--transition), visibility var(--transition);
  }

  .nav-list-open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  .nav-list li {
    border-bottom: 1px solid var(--color-borde);
  }

  .nav-list li:last-child {
    border-bottom: none;
  }

  .nav-link {
    display: block;
    padding: 1rem 0;
  }

  .nav-toggle-open span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
  }

  .nav-toggle-open span:nth-child(2) {
    opacity: 0;
  }

  .nav-toggle-open span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
  }
}

/* ============================================
   Hero
   ============================================ */

.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background-image: url('https://images.unsplash.com/photo-1581578731548-c64695cc6952?w=1920&q=85');
  background-size: cover;
  background-position: center top;
  background-repeat: no-repeat;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    135deg,
    rgba(26, 32, 44, 0.82) 0%,
    rgba(44, 82, 130, 0.55) 55%,
    rgba(26, 32, 44, 0.88) 100%
  );
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  padding-top: 5rem;
  padding-bottom: 3rem;
}

.hero-title {
  font-family: var(--font-heading);
  font-size: clamp(1.9rem, 5.5vw, 3.25rem);
  font-weight: 700;
  line-height: 1.2;
  color: var(--color-blanco);
  margin-bottom: 1.25rem;
  text-shadow: 0 2px 12px rgba(0, 0, 0, 0.4);
  max-width: 18ch;
  margin-left: auto;
  margin-right: auto;
}

.hero-subtitle {
  font-size: clamp(1rem, 2.2vw, 1.18rem);
  color: rgba(255, 255, 255, 0.93);
  max-width: 46ch;
  margin-left: auto;
  margin-right: auto;
  margin-bottom: 2.25rem;
  line-height: 1.7;
  text-shadow: 0 1px 6px rgba(0, 0, 0, 0.3);
}

/* Botones */
.btn {
  display: inline-block;
  padding: 0.875rem 1.75rem;
  font-family: var(--font-family);
  font-size: 1rem;
  font-weight: 600;
  text-align: center;
  border-radius: var(--radius);
  border: none;
  cursor: pointer;
  transition: background-color var(--transition), transform var(--transition), box-shadow var(--transition);
}

.btn-primary {
  background-color: var(--color-primario);
  color: var(--color-blanco);
}

.btn-primary:hover {
  background-color: var(--color-primario-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-hover);
}

/* ============================================
   Secciones genéricas
   ============================================ */

.section {
  padding-top: var(--section-padding-y);
  padding-bottom: var(--section-padding-y);
}

.section-alt {
  background-color: var(--color-fondo-alt);
}

.section-title {
  font-family: var(--font-heading);
  font-size: clamp(1.5rem, 3.5vw, 2rem);
  font-weight: 700;
  color: var(--color-grafito);
  margin-bottom: 2rem;
  text-align: center;
}

/* ============================================
   Nosotros
   ============================================ */

.nosotros-content {
  max-width: 65ch;
  margin: 0 auto;
}

.nosotros-text {
  margin-bottom: 1.25rem;
  color: var(--color-grafito-claro);
}

.nosotros-text:last-child {
  margin-bottom: 0;
}

.nosotros-text strong {
  color: var(--color-grafito);
}

/* ============================================
   Servicios - Grid (Mobile-First)
   ============================================ */

.servicios-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--gap);
}

.card {
  background-color: var(--color-blanco);
  padding: 0;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-borde);
  box-shadow: var(--shadow);
  overflow: hidden;
  position: relative;
  transition: transform var(--transition), box-shadow var(--transition);
  display: flex;
  flex-direction: column;
}

/* Barra superior de acento que se revela al hover */
.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-primario), var(--color-primario-claro));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition);
}

.card:hover::before {
  transform: scaleX(1);
}

.card:hover {
  transform: translateY(-6px);
  box-shadow: 0 20px 40px -12px rgba(44, 82, 130, 0.2);
}

.card-link {
  color: inherit;
  text-decoration: none;
  display: flex;
  flex-direction: column;
  padding: 1.75rem 1.5rem 1.5rem;
  cursor: pointer;
  text-align: left;
  width: 100%;
  font-family: inherit;
  font-size: inherit;
  background: none;
  border: none;
  flex: 1;
}

.card-link:hover {
  color: inherit;
}

.card-icon {
  width: 58px;
  height: 58px;
  background-color: rgba(44, 82, 130, 0.08);
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.25rem;
  transition: background-color var(--transition), transform var(--transition);
  flex-shrink: 0;
}

.card-icon i {
  font-size: 1.5rem;
  color: var(--color-primario);
  transition: color var(--transition);
}

.card:hover .card-icon {
  background-color: var(--color-primario);
  transform: scale(1.05);
}

.card:hover .card-icon i {
  color: var(--color-blanco);
}

.card-title {
  font-size: 0.975rem;
  font-weight: 700;
  color: var(--color-grafito);
  margin-bottom: 0.6rem;
  line-height: 1.35;
  letter-spacing: -0.01em;
}

.card-text {
  font-size: 0.875rem;
  color: var(--color-texto-suave);
  line-height: 1.6;
  flex: 1;
}

.card-cta {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--color-primario);
  margin-top: 1.25rem;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  transition: gap var(--transition-fast), color var(--transition-fast);
}

.card-cta i {
  font-size: 0.7rem;
  transition: transform var(--transition-fast);
}

.card:hover .card-cta {
  color: var(--color-primario-hover);
  gap: 0.65rem;
}

.card:hover .card-cta i {
  transform: translateX(3px);
}

/* Tablet: 2 columnas */
@media (min-width: 600px) {
  .servicios-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* Escritorio: 3 columnas */
@media (min-width: 900px) {
  .servicios-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 1.75rem;
  }

  .section {
    padding-top: var(--section-padding-y-lg);
    padding-bottom: var(--section-padding-y-lg);
  }
}

/* Escritorio grande: 4 columnas */
@media (min-width: 1200px) {
  .servicios-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* ============================================
   Modal de servicio
   ============================================ */

.modal-overlay {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 200;
  background-color: rgba(26, 32, 44, 0.75);
  backdrop-filter: blur(4px);
  padding: 1.25rem;
  align-items: center;
  justify-content: center;
  overflow-y: auto;
}

.modal-overlay.modal-active {
  display: flex;
}

.modal-box {
  background-color: var(--color-blanco);
  border-radius: var(--radius-lg);
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.35);
  width: 100%;
  max-width: 860px;
  position: relative;
  animation: modalIn 0.25s ease;
  overflow: hidden;
}

@keyframes modalIn {
  from { opacity: 0; transform: translateY(20px) scale(0.97); }
  to   { opacity: 1; transform: translateY(0) scale(1); }
}

.modal-close {
  position: absolute;
  top: 0.85rem;
  right: 1rem;
  background: none;
  border: none;
  font-size: 1.75rem;
  line-height: 1;
  color: var(--color-grafito-claro);
  cursor: pointer;
  z-index: 10;
  transition: color var(--transition-fast);
  padding: 0.25rem 0.5rem;
}

.modal-close:hover {
  color: var(--color-grafito);
}

.modal-inner {
  display: grid;
}

.modal-media img {
  width: 100%;
  height: 220px;
  object-fit: cover;
  display: block;
}

.modal-content {
  padding: 2rem 1.75rem;
}

.modal-title {
  font-family: var(--font-heading);
  font-size: clamp(1.2rem, 2.5vw, 1.55rem);
  font-weight: 700;
  color: var(--color-grafito);
  margin-bottom: 1rem;
  line-height: var(--line-height-tight);
  padding-right: 2rem;
}

.modal-p {
  color: var(--color-grafito-claro);
  margin-bottom: 1rem;
  line-height: 1.7;
}

.modal-p:last-of-type {
  margin-bottom: 1.5rem;
}

.modal-cta {
  display: inline-block;
}

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

  .modal-media img {
    height: 100%;
    min-height: 300px;
  }
}

@media (min-width: 900px) {
  .modal-media img {
    min-height: 380px;
  }
}

/* ============================================
   Contacto
   ============================================ */

.contacto-intro {
  text-align: center;
  color: var(--color-texto-suave);
  margin-bottom: 1.5rem;
  max-width: 40ch;
  margin-left: auto;
  margin-right: auto;
}

.contacto-info {
  text-align: center;
  margin-bottom: 2rem;
  padding: 1.5rem;
  background-color: var(--color-fondo);
  border-radius: var(--radius-lg);
  max-width: 28rem;
  margin-left: auto;
  margin-right: auto;
}

.contacto-info p {
  margin-bottom: 0.5rem;
}

.contacto-info p:last-child {
  margin-bottom: 0;
}

.contacto .btn {
  display: block;
  width: fit-content;
  margin: 0 auto;
}

/* ============================================
   Footer
   ============================================ */

.footer {
  background-color: var(--color-grafito-fondo);
  color: rgba(255, 255, 255, 0.85);
  padding: 2rem 0;
}

.footer-copy {
  font-size: 0.9rem;
  text-align: center;
}

.footer a {
  color: rgba(255, 255, 255, 0.9);
}

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