:root {
  /* Colors */
  --color-primary: #00113a;               
  --color-primary-container: #002366;     
  --color-on-primary: #ffffff;            
  --color-on-primary-container: #758dd5;  
  
  --color-surface: #fbf9f8;                  
  --color-surface-container-low: #f6f3f2;    
  --color-surface-container-lowest: #ffffff; 
  --color-surface-container-high: #eae8e7;   
  --color-surface-container-highest: #e4e2e1;

  --color-on-surface: #1b1c1c;               
  --color-on-surface-variant: #444650;       
  --color-outline: #757682;                  
  --color-outline-variant: rgba(197, 198, 210, 0.2); 
  --color-error: #ba1a1a;                    

  /* Shadows */
  --shadow-ambient: 0px 24px 48px rgba(0, 17, 58, 0.06); 
  --radius-sharp: 0px; 

  /* Typography */
  --font-vision: 'Manrope', sans-serif;
  --font-detail: 'Inter', sans-serif;

  --text-display-lg: 3.5rem;   
  --text-headline-md: 1.75rem; 
  --text-title-lg: 1.375rem;   
  --text-body-lg: 1rem;        
  --text-label-md: 0.75rem;    
  
  /* Layout */
  --spacing-section-y: 6rem;
  --spacing-section-x: 2rem;
  --container-max-width: 1280px;
}

/* Reset */
*, *::before, *::after { box-sizing: border-box; }
body, h1, h2, h3, h4, p, ul, ol, figure, blockquote, dl, dd { margin: 0; }
ul[role="list"], ol[role="list"], ul { list-style: none; padding: 0; }
button { font-family: inherit; }
html:focus-within { scroll-behavior: smooth; }

body {
  min-height: 100vh;
  text-rendering: optimizeSpeed;
  line-height: 1.5;
  font-family: var(--font-detail);
  font-size: var(--text-body-lg);
  background-color: var(--color-surface);
  color: var(--color-on-surface);
  -webkit-font-smoothing: antialiased;
}
a { text-decoration: none; color: inherit; }
img, picture { max-width: 100%; display: block; }
input, button, textarea, select { font: inherit; outline: none; border-radius: var(--radius-sharp); }

/* Typography Classes */
.display-lg {
  font-family: var(--font-vision);
  font-size: 2.5rem; /* Fallback mobile */
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.1;
}
@media(min-width: 768px) { .display-lg { font-size: var(--text-display-lg); } }

.headline-md {
  font-family: var(--font-vision);
  font-size: 1.5rem; /* mobile fallback */
  font-weight: 500;
  line-height: 1.2;
}
@media(min-width: 768px) { .headline-md { font-size: var(--text-headline-md); } }

.title-lg {
  font-family: var(--font-detail);
  font-size: var(--text-title-lg);
  font-weight: 600;
  line-height: 1.3;
}

.body-lg {
  font-family: var(--font-detail);
  font-size: var(--text-body-lg);
  font-weight: 400;
  line-height: 1.6;
}

.label-md {
  font-family: var(--font-detail);
  font-size: var(--text-label-md);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

/* Utilities */
.container {
  max-width: var(--container-max-width);
  margin-inline: auto;
  padding-inline: var(--spacing-section-x);
}
.text-center { text-align: center; }
.material-symbols-outlined { font-variation-settings: 'FILL' 0, 'wght' 400, 'GRAD' 0, 'opsz' 24; display: inline-block; vertical-align: middle; }

.mb-2 { margin-bottom: 0.5rem; }
.mb-4 { margin-bottom: 1rem; }
.mb-8 { margin-bottom: 2rem; }
.mb-12 { margin-bottom: 3rem; }
.mt-2 { margin-top: 0.5rem; }
.mt-4 { margin-top: 1rem; }
.block { display: block; }

/* Asymmetric / Grids */
.grid-2 { display: grid; grid-template-columns: 1fr; gap: 4rem; }
@media(min-width: 768px) { .grid-2 { grid-template-columns: 1fr 1fr; } }

.grid-3 { display: grid; grid-template-columns: 1fr; gap: 2rem; }
@media(min-width: 768px) { .grid-3 { grid-template-columns: repeat(3, 1fr); } }

.grid-4 { display: grid; grid-template-columns: 1fr; gap: 2rem; }
@media(min-width: 768px) { .grid-4 { grid-template-columns: repeat(2, 1fr); } }
@media(min-width: 1024px) { .grid-4 { grid-template-columns: repeat(4, 1fr); } }

/* Header & Nav */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background-color: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
}
.site-header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 1.5rem;
  padding-bottom: 1.5rem;
}
.brand-logo {
  color: var(--color-primary);
  font-family: var(--font-vision);
  font-weight: 700;
  font-size: 1.25rem;
  letter-spacing: -0.02em;
}

/* Nav Desktop/Mobile & Accesibilidad */
.skip-link {
  position: absolute;
  top: -100px;
  left: 0;
  background: var(--color-primary);
  color: var(--color-on-primary);
  padding: 1rem;
  z-index: 9999;
  font-family: var(--font-detail);
  font-weight: 600;
  transition: top 0.3s ease;
}
.skip-link:focus {
  top: 0;
  outline: none;
}
*:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 4px;
}

.mobile-menu-toggle {
  display: block;
  background: transparent;
  border: none;
  cursor: pointer;
  color: var(--color-primary);
  padding: 0.5rem;
}
@media (min-width: 768px) {
  .mobile-menu-toggle { display: none; }
}

.main-nav { display: none; }
@media (min-width: 768px) {
  .main-nav { display: flex; gap: 2rem; align-items: center; }
}
@media (max-width: 767px) {
  .main-nav {
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    background-color: var(--color-surface-container-lowest);
    padding: 1.5rem;
    box-shadow: var(--shadow-ambient);
    border-top: 1px solid var(--color-outline-variant);
  }
  .main-nav.is-open { display: flex; }
}
.nav-link { color: var(--color-outline); transition: color 0.3s; }
.nav-link:hover { color: var(--color-primary-container); }
.nav-link.active {
  color: var(--color-primary-container);
  border-bottom: 2px solid var(--color-primary-container);
  padding-bottom: 0.25rem;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  font-family: var(--font-detail);
  font-weight: 600;
  cursor: pointer;
  border: none;
  font-size: 0.875rem;
  transition: all 0.3s;
  border-radius: var(--radius-sharp);
}
.btn-primary { 
  background-color: var(--color-primary); 
  color: var(--color-on-primary); 
}
.btn-primary:hover { border-radius: var(--radius-sharp); box-shadow: var(--shadow-ambient); }

.btn-secondary {
  background-color: var(--color-surface-container-highest);
  color: var(--color-primary);
}
.btn-secondary:hover { background-color: var(--color-surface-container-high); box-shadow: var(--shadow-ambient); }

.btn-tertiary {
  background-color: transparent;
  color: var(--color-primary);
  padding-left: 0; padding-right: 0;
}
.btn-tertiary:hover { text-decoration: underline; }

/* Sections & Surfaces shifts (No-Line Rule) */
.section { padding-block: var(--spacing-section-y); }
.bg-surface { background-color: var(--color-surface); }
.bg-surface-low { background-color: var(--color-surface-container-low); }

/* Hero Section (Glass & Gradient) */
.hero {
  position: relative;
  min-height: 80vh;
  display: flex;
  align-items: center;
  background: linear-gradient(45deg, var(--color-primary) 0%, var(--color-primary-container) 100%);
  color: var(--color-on-primary);
  overflow: hidden;
}
.hero-bg { position: absolute; inset: 0; z-index: 0; }
.hero-bg img { width: 100%; height: 100%; object-fit: cover; opacity: 0.2; mix-blend-mode: overlay; filter: grayscale(100%); }

.hero-content {
  position: relative;
  z-index: 10;
  display: flex;
  flex-direction: column;
  gap: 2rem;
  max-width: 800px;
}
.hero-text {
  font-family: var(--font-detail);
  font-size: 1.25rem;
  color: rgba(255,255,255,0.8);
  font-weight: 300;
}

/* Forms / Inputs (Minimalist) */
.form-group { margin-bottom: 2.5rem; }
.form-label {
  display: block;
  font-family: var(--font-detail);
  font-size: var(--text-label-md);
  font-weight: 500;
  text-transform: uppercase;
  color: var(--color-outline);
  margin-bottom: 0.5rem;
}
.form-control {
  width: 100%;
  background: transparent;
  border: none;
  border-bottom: 1px solid var(--color-outline);
  padding: 0.5rem 0;
  color: var(--color-on-surface);
  transition: all 0.3s;
}
.form-control:focus { border-bottom: 2px solid var(--color-primary); }

/* Expertise Inlay (Signature Component) */
.expertise-inlay {
  background-color: var(--color-primary-container);
  color: var(--color-on-primary-container);
  padding: 4rem 3rem;
  display: flex;
  flex-direction: column;
}
.expertise-inlay h2, .expertise-inlay h3 {
  color: var(--color-on-primary);
  margin-bottom: 1.5rem;
}

/* Image Wrappers */
.img-wrapper {
  overflow: hidden;
  background-color: var(--color-surface-container-high);
}
.img-wrapper img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: grayscale(100%);
  transition: filter 0.7s;
}
.img-wrapper:hover img { filter: grayscale(0%); }

.card-icon {
  font-size: 2.5rem;
  color: var(--color-primary);
  margin-bottom: 1.5rem;
}

/* Footer */
.site-footer {
  background-color: var(--color-surface-container-low);
  padding-block: 4rem;
}
.site-footer .container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2rem;
}
@media(min-width: 768px) {
  .site-footer .container { flex-direction: row; justify-content: space-between; }
}

/* Construction Modal (Overlays & Glass) */
.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 9999;
  background-color: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.4s ease, visibility 0.4s ease;
}
.modal-overlay.is-active {
  opacity: 1;
  visibility: visible;
}
.modal-content {
  background-color: var(--color-surface-container-lowest);
  box-shadow: var(--shadow-ambient);
  padding: 3rem;
  max-width: 500px;
  width: 100%;
  text-align: left;
  transform: translateY(20px);
  transition: transform 0.4s ease;
}
.modal-overlay.is-active .modal-content {
  transform: translateY(0);
}
.modal-icon {
  font-size: 3rem;
  color: var(--color-primary);
  margin-bottom: 1.5rem;
}