:root {
  /* Paleta del logo DS Construcciones */
  --color-primary: #1e6bb8;
  --color-primary-dark: #155a9e;
  --color-primary-light: #2d7fd4;
  --color-accent: #f59e0b;
  --color-bg: #f4f6f8;
  --color-surface: #ffffff;
  --color-surface-alt: #e8edf2;
  --color-text: #1a2b3c;
  --color-muted: #5c6f82;
  --color-white: #ffffff;
  --color-nav-bg: rgba(255, 255, 255, 0.92);
  --font-display: "Oswald", sans-serif;
  --font-body: "DM Sans", system-ui, sans-serif;
  --radius: 10px;
  --radius-lg: 16px;
  --shadow: 0 4px 24px rgba(26, 43, 60, 0.08);
  --shadow-lg: 0 12px 40px rgba(26, 43, 60, 0.12);
  --transition: 0.25s ease;
}

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  overflow-x: hidden;
}

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

a {
  color: inherit;
  text-decoration: none;
}

ul {
  list-style: none;
}

.container {
  width: min(1140px, 92vw);
  margin-inline: auto;
}

/* Header — fondo claro para que el logo azul (PNG transparente) destaque */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 0.75rem 0;
  background: var(--color-nav-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(26, 43, 60, 0.06);
  transition: background var(--transition), box-shadow var(--transition), padding var(--transition);
}

.header.scrolled {
  background: rgba(255, 255, 255, 0.98);
  box-shadow: 0 4px 30px rgba(26, 43, 60, 0.08);
  padding: 0.5rem 0;
}

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

.logo {
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

.logo-img {
  display: block;
  height: auto;
  width: auto;
  object-fit: contain;
}

.logo--header .logo-img {
  max-height: 76px;
  max-width: 280px;
}

.logo--footer .logo-img {
  max-height: 64px;
  max-width: 240px;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.nav-menu a {
  font-size: 0.9rem;
  font-weight: 500;
  padding: 0.5rem 0.85rem;
  border-radius: var(--radius);
  transition: color var(--transition), background var(--transition);
}

.nav-menu a:hover {
  color: var(--color-primary);
  background: rgba(30, 107, 184, 0.06);
}

.nav-cta {
  background: var(--color-primary);
  color: var(--color-white);
  padding: 0.55rem 1.35rem;
  margin-left: 0.5rem;
  border-radius: var(--radius);
  font-weight: 600;
  box-shadow: 0 4px 14px rgba(30, 107, 184, 0.28);
}

.nav-cta:hover {
  background: var(--color-primary-light);
  color: var(--color-white);
  box-shadow: 0 6px 20px rgba(30, 107, 184, 0.35);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav-toggle span {
  width: 24px;
  height: 2px;
  background: var(--color-primary);
  border-radius: 2px;
  transition: var(--transition);
}

/* Hero */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 7rem 0 4rem;
}

.hero-bg {
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  background: url("assets/hero.jpg") center center / cover no-repeat;
}

.hero-overlay {
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  background: linear-gradient(
    115deg,
    rgba(15, 30, 48, 0.88) 0%,
    rgba(21, 90, 158, 0.72) 45%,
    rgba(30, 107, 184, 0.55) 100%
  );
}

.hero-content {
  position: relative;
  z-index: 1;
}

.hero-tag {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.85);
  margin-bottom: 1rem;
}

.hero h1 {
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 6vw, 4rem);
  font-weight: 700;
  line-height: 1.1;
  text-transform: uppercase;
  letter-spacing: 0.02em;
  max-width: 14ch;
  margin-bottom: 1.25rem;
  color: var(--color-white);
}

.hero h1 .highlight {
  color: var(--color-accent);
  text-decoration: none;
}

.hero-desc {
  font-size: 1.125rem;
  color: rgba(255, 255, 255, 0.88);
  max-width: 42ch;
  margin-bottom: 2rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 3.5rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.875rem 1.75rem;
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius);
  border: 2px solid transparent;
  cursor: pointer;
  transition: all var(--transition);
}

.btn-primary {
  background: var(--color-white);
  color: var(--color-primary);
  border-color: var(--color-white);
}

.btn-primary:hover {
  background: var(--color-bg);
  border-color: var(--color-bg);
  transform: translateY(-2px);
}

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

.btn-outline:hover {
  border-color: var(--color-white);
  background: rgba(255, 255, 255, 0.1);
  color: var(--color-white);
}

.btn-light {
  color: var(--color-bg);
}

.btn-full {
  width: 100%;
}

.hero-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 2.5rem;
  padding-top: 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.25);
}

.stat strong {
  display: block;
  font-family: var(--font-display);
  font-size: 2rem;
  color: var(--color-white);
  line-height: 1.2;
}

.stat span {
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.75);
}

/* Sections */
.section {
  padding: 5rem 0;
}

.section-label {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: 0.75rem;
}

.section-header h2,
.nosotros-text h2,
.contacto-info h2 {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.02em;
  margin-bottom: 1rem;
}

.section-header.center {
  text-align: center;
  max-width: 560px;
  margin-inline: auto;
  margin-bottom: 3rem;
}

.section-header p {
  color: var(--color-muted);
}

.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}

/* Nosotros */
.nosotros {
  background: var(--color-surface-alt);
}

.nosotros-img {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow);
}

.nosotros-img img {
  width: 100%;
  aspect-ratio: 4/3;
  object-fit: cover;
}

.nosotros-text p {
  color: var(--color-muted);
  margin-bottom: 1rem;
}

.check-list {
  margin-top: 1.5rem;
}

.check-list li {
  position: relative;
  padding-left: 1.75rem;
  margin-bottom: 0.6rem;
  color: var(--color-text);
}

.check-list li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--color-primary);
  font-weight: 700;
}

/* Servicios */
.servicios-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.5rem;
}

.servicio-card {
  background: var(--color-surface);
  border: 1px solid rgba(0, 74, 141, 0.1);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow);
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
}

.servicio-card:hover {
  transform: translateY(-4px);
  border-color: rgba(0, 74, 141, 0.35);
  box-shadow: var(--shadow-lg);
}

.servicio-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 52px;
  height: 52px;
  margin-bottom: 1.25rem;
  border-radius: var(--radius);
  background: rgba(30, 107, 184, 0.08);
  color: var(--color-primary);
}

.servicio-icon svg {
  width: 26px;
  height: 26px;
  stroke: currentColor;
  fill: none;
  stroke-width: 1.75;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.servicio-card h3 {
  font-family: var(--font-display);
  font-size: 1.25rem;
  text-transform: uppercase;
  margin-bottom: 0.5rem;
  color: var(--color-primary);
}

.servicio-card p {
  font-size: 0.9rem;
  color: var(--color-muted);
}

/* Proyectos */
.proyectos {
  background: var(--color-surface-alt);
}

.proyectos-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1.5rem;
}

.proyecto-card {
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--color-surface);
  box-shadow: var(--shadow);
  transition: transform var(--transition), box-shadow var(--transition);
}

.proyecto-card--destacado {
  grid-column: 1 / -1;
}

.proyecto-card--destacado img {
  aspect-ratio: 21 / 9;
  object-position: center;
}

@media (max-width: 768px) {
  .proyecto-card--destacado img {
    aspect-ratio: 4 / 3;
  }
}

.proyecto-card:hover {
  transform: scale(1.02);
  box-shadow: var(--shadow-lg);
}

.proyecto-card img {
  width: 100%;
  aspect-ratio: 4/3;
  object-fit: cover;
}

.proyecto-info {
  padding: 1.25rem;
}

.proyecto-info h3 {
  font-family: var(--font-display);
  font-size: 1.1rem;
  text-transform: uppercase;
  margin-bottom: 0.25rem;
  color: var(--color-primary);
}

.proyecto-info span {
  font-size: 0.8rem;
  color: var(--color-muted);
}

/* CTA Banner */
.cta-banner {
  padding: 4rem 0;
  background: linear-gradient(135deg, var(--color-primary-dark), var(--color-primary));
}

.cta-inner {
  text-align: center;
}

.cta-inner h2 {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3vw, 2rem);
  text-transform: uppercase;
  color: var(--color-white);
  margin-bottom: 0.5rem;
}

.cta-inner p {
  color: rgba(255, 255, 255, 0.9);
  margin-bottom: 1.5rem;
}

.cta-inner .btn-primary {
  background: var(--color-white);
  color: var(--color-primary);
  border-color: var(--color-white);
}

.cta-inner .btn-primary:hover {
  background: var(--color-bg);
  border-color: var(--color-bg);
}

/* Contacto */
.contacto-list {
  margin-top: 2rem;
}

.contacto-list li {
  display: flex;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.contacto-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  border-radius: var(--radius);
  background: rgba(30, 107, 184, 0.08);
  color: var(--color-primary);
}

.contacto-icon img {
  display: block;
  width: 22px;
  height: 22px;
}

.contacto-list strong {
  display: block;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-muted);
  margin-bottom: 0.2rem;
}

.contacto-list a {
  color: var(--color-primary);
  transition: color var(--transition);
}

.contacto-list a:hover {
  color: var(--color-primary-light);
}

.contacto-direccion {
  display: inline-block;
  line-height: 1.5;
  color: var(--color-text);
  transition: color var(--transition);
}

.contacto-direccion:hover {
  color: var(--color-primary);
}

.contacto-form {
  background: var(--color-surface);
  padding: 2rem;
  border-radius: var(--radius-lg);
  border: 1px solid rgba(0, 74, 141, 0.12);
  box-shadow: var(--shadow);
}

.form-group {
  margin-bottom: 1.25rem;
}

.form-group label {
  display: block;
  font-size: 0.8rem;
  font-weight: 600;
  margin-bottom: 0.4rem;
  color: var(--color-muted);
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 0.75rem 1rem;
  font-family: inherit;
  font-size: 1rem;
  color: var(--color-text);
  background: var(--color-bg);
  border: 1px solid rgba(0, 74, 141, 0.15);
  border-radius: var(--radius);
  transition: border-color var(--transition);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-primary);
}

.contacto .btn-primary {
  background: var(--color-primary);
  color: var(--color-white);
  border-color: var(--color-primary);
}

.contacto .btn-primary:hover {
  background: var(--color-primary-light);
  border-color: var(--color-primary-light);
}

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

.form-note {
  margin-top: 1rem;
  text-align: center;
  color: var(--color-primary);
  font-weight: 500;
}

/* Footer — fondo claro para el logo transparente */
.footer {
  padding: 2.5rem 0;
  background: var(--color-surface);
  border-top: 1px solid rgba(26, 43, 60, 0.08);
  color: var(--color-text);
}

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

.footer-copy {
  font-size: 0.85rem;
  color: var(--color-muted);
}

.footer-links {
  display: flex;
  gap: 1.5rem;
}

.footer-links a {
  font-size: 0.85rem;
  color: var(--color-muted);
  transition: color var(--transition);
}

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

/* WhatsApp flotante */
.whatsapp-float {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 60px;
  height: 60px;
  background: #25d366;
  color: var(--color-white);
  border-radius: 50%;
  box-shadow: 0 4px 20px rgba(37, 211, 102, 0.45);
  transition: transform var(--transition), box-shadow var(--transition);
}

.whatsapp-float svg {
  width: 32px;
  height: 32px;
}

.whatsapp-float:hover {
  transform: scale(1.08);
  box-shadow: 0 6px 28px rgba(37, 211, 102, 0.55);
}

.whatsapp-float:active {
  transform: scale(0.98);
}

/* Responsive */
@media (max-width: 900px) {
  .grid-2 {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }

  .nosotros-img {
    order: -1;
  }
}

@media (max-width: 768px) {
  .logo--header .logo-img {
    max-height: 62px;
    max-width: 220px;
  }

  .nav-toggle {
    display: flex;
  }

  .nav-menu {
    position: fixed;
    top: 60px;
    left: 0;
    right: 0;
    width: 100%;
    height: auto;
    flex-direction: column;
    align-items: center;
    padding: 0;
    background: var(--color-white);
    gap: 1.5rem;
    transition: max-height var(--transition), padding var(--transition);
    box-shadow: 0 4px 12px rgba(0, 74, 141, 0.08);
    max-height: 0;
    overflow: hidden;
    visibility: hidden;
  }

  .nav-menu.open {
    max-height: 500px;
    padding: 1rem 0;
    visibility: visible;
  }

  .nav-menu.open a {
    color: var(--color-text);
  }

  .nav-menu.open .nav-cta {
    background: var(--color-primary);
    color: var(--color-white);
  }

  .nav-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
  }

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

  .nav-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
  }

  .hero-stats {
    gap: 1.5rem;
  }

  .footer-inner {
    flex-direction: column;
    text-align: center;
  }
}

/* Overlay to allow closing mobile nav by tapping outside */
.nav-overlay {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  background: rgba(0, 0, 0, 0.36);
  z-index: 180;
}

@media (max-width: 768px) {
  .nav-menu {
    z-index: 190;
  }
}

  /* Close button (hidden on desktop, shown in mobile nav) */
  .nav-close {
    display: none;
    background: transparent;
    border: none;
    font-size: 1.25rem;
    line-height: 1;
    color: var(--color-primary);
    cursor: pointer;
  }

  @media (max-width: 768px) {
    .nav-close {
      display: flex;
      position: absolute;
      top: 14px;
      right: 14px;
      width: 44px;
      height: 44px;
      align-items: center;
      justify-content: center;
      border-radius: 50%;
      background: var(--color-surface);
      box-shadow: 0 6px 18px rgba(10, 30, 60, 0.12);
      z-index: 195;
      font-weight: 700;
    }

    .nav-close:focus {
      outline: 2px solid rgba(30, 107, 184, 0.18);
      outline-offset: 2px;
    }
  }