/* ===== VARIABLES CSS ===== */
:root {
  /* Colores principales Itaipu */
  --itaipu-blue-primary: #003366;
  --itaipu-blue-secondary: #0066CC;
  --itaipu-green: #00AA44;
  --itaipu-light-blue: #E6F3FF;
  
  /* Colores de estado */
  --priority-high: #DC2626;
  --priority-medium: #F59E0B;
  --priority-normal: #10B981;
  --priority-planning: #6B7280;
  
  /* Colores neutros */
  --gray-50: #F9FAFB;
  --gray-100: #F3F4F6;
  --gray-200: #E5E7EB;
  --gray-300: #D1D5DB;
  --gray-400: #9CA3AF;
  --gray-500: #6B7280;
  --gray-600: #4B5563;
  --gray-700: #374151;
  --gray-800: #1F2937;
  --gray-900: #111827;
  --white: #FFFFFF;
  
  /* Tipografía */
  --font-family: 'Roboto', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 1.875rem;
  --font-size-4xl: 2.25rem;
  
  /* Espaciado */
  --spacing-1: 0.25rem;
  --spacing-2: 0.5rem;
  --spacing-3: 0.75rem;
  --spacing-4: 1rem;
  --spacing-5: 1.25rem;
  --spacing-6: 1.5rem;
  --spacing-8: 2rem;
  --spacing-10: 2.5rem;
  --spacing-12: 3rem;
  --spacing-16: 4rem;
  --spacing-20: 5rem;
  
  /* Sombras */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  
  /* Bordes */
  --border-radius-sm: 0.25rem;
  --border-radius: 0.375rem;
  --border-radius-md: 0.5rem;
  --border-radius-lg: 0.75rem;
  --border-radius-xl: 1rem;
  
  /* Transiciones */
  --transition-fast: 150ms ease-in-out;
  --transition-normal: 300ms ease-in-out;
  --transition-slow: 500ms ease-in-out;
}

/* ===== RESET Y BASE ===== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--gray-900);
  background-color: var(--gray-50);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a {
  color: var(--itaipu-blue-secondary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--itaipu-blue-primary);
}

/* ===== UTILIDADES ===== */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-4);
}

.container-wide {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 var(--spacing-4);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ===== BOTONES ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-2);
  padding: var(--spacing-3) var(--spacing-6);
  font-size: var(--font-size-base);
  font-weight: 500;
  text-decoration: none;
  border: none;
  border-radius: var(--border-radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.btn-primary {
  background-color: var(--itaipu-blue-secondary);
  color: var(--white);
}

.btn-primary:hover {
  background-color: var(--itaipu-blue-primary);
  color: var(--white);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-secondary {
  background-color: var(--itaipu-green);
  color: var(--white);
}

.btn-secondary:hover {
  background-color: #008833;
  color: var(--white);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-outline {
  background-color: transparent;
  color: var(--itaipu-blue-secondary);
  border: 2px solid var(--itaipu-blue-secondary);
}

.btn-outline:hover {
  background-color: var(--itaipu-blue-secondary);
  color: var(--white);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-sm {
  padding: var(--spacing-2) var(--spacing-4);
  font-size: var(--font-size-sm);
}

.btn-lg {
  padding: var(--spacing-4) var(--spacing-8);
  font-size: var(--font-size-lg);
}

/* ===== HEADER ===== */
.main-header {
  background: linear-gradient(135deg, var(--itaipu-blue-primary) 0%, var(--itaipu-blue-secondary) 100%);
  color: var(--white);
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: var(--shadow-lg);
}

.header-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-4) 0;
  gap: var(--spacing-6);
}

.logo-section {
  display: flex;
  align-items: center;
  gap: var(--spacing-4);
}

.logo {
  height: 48px;
  width: auto;
}

.title-group {
  display: flex;
  flex-direction: column;
}

.site-title {
  font-size: var(--font-size-xl);
  font-weight: 700;
  margin: 0;
  line-height: 1.2;
}

.site-subtitle {
  font-size: var(--font-size-sm);
  opacity: 0.9;
  margin: 0;
}

/* Navegación Principal */
.main-nav {
  flex: 1;
  display: flex;
  justify-content: center;
}

.nav-list {
  display: flex;
  list-style: none;
  gap: var(--spacing-2);
  margin: 0;
  padding: 0;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: var(--spacing-2);
  padding: var(--spacing-3) var(--spacing-4);
  color: var(--white);
  font-weight: 500;
  border-radius: var(--border-radius-md);
  transition: all var(--transition-fast);
  position: relative;
}

.nav-link:hover,
.nav-link.active {
  background-color: rgba(255, 255, 255, 0.1);
  color: var(--white);
  transform: translateY(-1px);
}

.nav-link i {
  font-size: var(--font-size-sm);
}

/* Dropdown Navigation */
.nav-dropdown {
  position: relative;
}

.dropdown-menu {
  position: absolute;
  top: 100%;
  left: 0;
  background-color: var(--white);
  border-radius: var(--border-radius-md);
  box-shadow: var(--shadow-xl);
  padding: var(--spacing-2);
  min-width: 200px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
  transition: all var(--transition-fast);
  z-index: 1001;
}

.nav-dropdown:hover .dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.dropdown-menu li {
  list-style: none;
}

.dropdown-menu a {
  display: flex;
  align-items: center;
  gap: var(--spacing-2);
  padding: var(--spacing-3);
  color: var(--gray-700);
  border-radius: var(--border-radius);
  transition: all var(--transition-fast);
}

.dropdown-menu a:hover {
  background-color: var(--itaipu-light-blue);
  color: var(--itaipu-blue-primary);
}

/* Header Actions */
.header-actions {
  display: flex;
  align-items: center;
  gap: var(--spacing-4);
}

.search-container {
  position: relative;
  display: flex;
  align-items: center;
}

.search-input {
  padding: var(--spacing-2) var(--spacing-4);
  padding-right: var(--spacing-10);
  border: 2px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--border-radius-md);
  background-color: rgba(255, 255, 255, 0.1);
  color: var(--white);
  font-size: var(--font-size-sm);
  width: 250px;
  transition: all var(--transition-fast);
}

.search-input::placeholder {
  color: rgba(255, 255, 255, 0.7);
}

.search-input:focus {
  outline: none;
  border-color: var(--white);
  background-color: rgba(255, 255, 255, 0.2);
  width: 300px;
}

.search-btn {
  position: absolute;
  right: var(--spacing-2);
  background: none;
  border: none;
  color: var(--white);
  cursor: pointer;
  padding: var(--spacing-2);
  border-radius: var(--border-radius);
  transition: all var(--transition-fast);
}

.search-btn:hover {
  background-color: rgba(255, 255, 255, 0.1);
}

.menu-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--white);
  font-size: var(--font-size-xl);
  cursor: pointer;
  padding: var(--spacing-2);
  border-radius: var(--border-radius);
  transition: all var(--transition-fast);
}

.menu-toggle:hover {
  background-color: rgba(255, 255, 255, 0.1);
}

/* ===== HERO SECTION ===== */
.hero-section {
  position: relative;
  min-height: 600px;
  display: flex;
  align-items: center;
  overflow: hidden;
}

.hero-background {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(135deg, var(--itaipu-blue-primary) 0%, var(--itaipu-blue-secondary) 50%, var(--itaipu-green) 100%);
  z-index: -2;
}

.hero-background::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grid" width="10" height="10" patternUnits="userSpaceOnUse"><path d="M 10 0 L 0 0 0 10" fill="none" stroke="rgba(255,255,255,0.1)" stroke-width="0.5"/></pattern></defs><rect width="100" height="100" fill="url(%23grid)"/></svg>');
  z-index: -1;
}

.hero-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 51, 102, 0.1);
  z-index: -1;
}

.hero-content {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: var(--spacing-12);
  align-items: center;
  padding: var(--spacing-20) 0;
  color: var(--white);
}

.hero-title {
  font-size: var(--font-size-4xl);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--spacing-6);
}

.hero-title .highlight {
  color: var(--itaipu-green);
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

.hero-description {
  font-size: var(--font-size-lg);
  line-height: 1.6;
  margin-bottom: var(--spacing-8);
  opacity: 0.95;
}

.hero-actions {
  display: flex;
  gap: var(--spacing-4);
  flex-wrap: wrap;
}

.hero-visual {
  display: flex;
  justify-content: center;
  align-items: center;
}

.hero-stats {
  display: grid;
  gap: var(--spacing-6);
  text-align: center;
}

.stat-item {
  background: rgba(255, 255, 255, 0.1);
  padding: var(--spacing-6);
  border-radius: var(--border-radius-xl);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.stat-number {
  font-size: var(--font-size-3xl);
  font-weight: 700;
  color: var(--itaipu-green);
  margin-bottom: var(--spacing-2);
}

.stat-label {
  font-size: var(--font-size-sm);
  opacity: 0.9;
}

/* ===== MAIN CONTENT ===== */
.main-content {
  padding: var(--spacing-20) 0;
}

.section-header {
  text-align: center;
  margin-bottom: var(--spacing-12);
}

.section-title {
  font-size: var(--font-size-3xl);
  font-weight: 700;
  color: var(--itaipu-blue-primary);
  margin-bottom: var(--spacing-4);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-3);
}

.section-title i {
  color: var(--itaipu-green);
}

.section-description {
  font-size: var(--font-size-lg);
  color: var(--gray-600);
  max-width: 600px;
  margin: 0 auto;
}

/* ===== WIDGETS ===== */
.widget {
  background: var(--white);
  border-radius: var(--border-radius-xl);
  box-shadow: var(--shadow-md);
  overflow: hidden;
  transition: all var(--transition-normal);
}

.widget:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.widget-header {
  padding: var(--spacing-6);
  border-bottom: 1px solid var(--gray-200);
  background: linear-gradient(135deg, var(--itaipu-light-blue) 0%, var(--white) 100%);
}

.widget-title {
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--itaipu-blue-primary);
  margin: 0;
  display: flex;
  align-items: center;
  gap: var(--spacing-2);
}

.widget-content {
  padding: var(--spacing-6);
}

/* ===== CARDS ===== */
.card {
  background: var(--white);
  border-radius: var(--border-radius-xl);
  box-shadow: var(--shadow-md);
  overflow: hidden;
  transition: all var(--transition-normal);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
}

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-4);
  border-bottom: 1px solid var(--gray-200);
}

.card-content {
  padding: var(--spacing-6);
}

.card-title {
  font-size: var(--font-size-xl);
  font-weight: 600;
  color: var(--gray-900);
  margin-bottom: var(--spacing-3);
}

.card-description {
  color: var(--gray-600);
  line-height: 1.6;
  margin-bottom: var(--spacing-4);
}

/* ===== BADGES ===== */
.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-1);
  padding: var(--spacing-1) var(--spacing-3);
  font-size: var(--font-size-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-radius: var(--border-radius-md);
}

.badge.high {
  background-color: var(--priority-high);
  color: var(--white);
}

.badge.medium {
  background-color: var(--priority-medium);
  color: var(--white);
}

.badge.normal {
  background-color: var(--priority-normal);
  color: var(--white);
}

.badge.planning {
  background-color: var(--priority-planning);
  color: var(--white);
}

/* ===== PROGRESS BARS ===== */
.progress-bar {
  width: 100%;
  height: 8px;
  background-color: var(--gray-200);
  border-radius: var(--border-radius-md);
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--itaipu-green) 0%, var(--itaipu-blue-secondary) 100%);
  border-radius: var(--border-radius-md);
  transition: width var(--transition-slow);
}

/* ===== FOOTER ===== */
.main-footer {
  background: linear-gradient(135deg, var(--gray-900) 0%, var(--gray-800) 100%);
  color: var(--white);
  padding: var(--spacing-16) 0 var(--spacing-8);
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-8);
  margin-bottom: var(--spacing-12);
}

.footer-section h4 {
  color: var(--itaipu-green);
  margin-bottom: var(--spacing-4);
  font-size: var(--font-size-lg);
  font-weight: 600;
}

.footer-links {
  list-style: none;
}

.footer-links li {
  margin-bottom: var(--spacing-2);
}

.footer-links a {
  color: var(--gray-300);
  transition: color var(--transition-fast);
}

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

.footer-bottom {
  border-top: 1px solid var(--gray-700);
  padding-top: var(--spacing-8);
}

.footer-bottom-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--spacing-4);
}

.footer-meta {
  display: flex;
  gap: var(--spacing-2);
  color: var(--gray-400);
  font-size: var(--font-size-sm);
}

/* ===== RESPONSIVE DESIGN ===== */
@media (max-width: 1024px) {
  .container {
    padding: 0 var(--spacing-6);
  }
  
  .hero-content {
    grid-template-columns: 1fr;
    gap: var(--spacing-8);
    text-align: center;
  }
  
  .hero-title {
    font-size: var(--font-size-3xl);
  }
  
  .nav-list {
    display: none;
  }
  
  .menu-toggle {
    display: block;
  }
}

@media (max-width: 768px) {
  .header-content {
    flex-wrap: wrap;
    gap: var(--spacing-4);
  }
  
  .search-container {
    order: 3;
    width: 100%;
  }
  
  .search-input {
    width: 100%;
  }
  
  .hero-title {
    font-size: var(--font-size-2xl);
  }
  
  .hero-description {
    font-size: var(--font-size-base);
  }
  
  .hero-actions {
    justify-content: center;
  }
  
  .section-title {
    font-size: var(--font-size-2xl);
    flex-direction: column;
    gap: var(--spacing-2);
  }
  
  .footer-bottom-content {
    flex-direction: column;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 var(--spacing-4);
  }
  
  .hero-content {
    padding: var(--spacing-12) 0;
  }
  
  .hero-title {
    font-size: var(--font-size-xl);
  }
  
  .btn {
    width: 100%;
    justify-content: center;
  }
  
  .hero-actions {
    flex-direction: column;
  }
}