/* ============================================
   VARIABLES Y CONFIGURACIÓN GLOBAL
   ============================================ */
:root {
  /* Paleta de colores inspirada en ondas y física */
  --primary: #2563eb;
  --primary-dark: #1e40af;
  --primary-light: #60a5fa;
  --secondary: #8b5cf6;
  --secondary-dark: #7c3aed;
  --accent: #3b82f6;
  --accent-dark: #2563eb;
  
  /* Colores de fondo */
  --bg-primary: #ffffff;
  --bg-secondary: #f8fafc;
  --bg-card: #ffffff;
  --bg-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  
  /* Textos */
  --text-primary: #1e293b;
  --text-secondary: #64748b;
  --text-light: #94a3b8;
  
  /* Sombras */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
  --shadow-glow: 0 0 20px rgba(59, 130, 246, 0.3);
  
  /* Bordes y espaciado */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
}

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

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  line-height: 1.6;
  color: var(--text-primary);
  background: var(--bg-secondary);
  background-image: 
    radial-gradient(circle at 20% 50%, rgba(120, 119, 198, 0.03) 0%, transparent 50%),
    radial-gradient(circle at 80% 80%, rgba(120, 119, 198, 0.03) 0%, transparent 50%);
  background-attachment: fixed;
}

/* ============================================
   CONTENEDOR PRINCIPAL
   ============================================ */
main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 40px 20px;
  animation: fadeIn 0.6s ease-out;
}

/* ============================================
   TÍTULOS Y TIPOGRAFÍA
   ============================================ */
.titulo {
  font-size: 2.5rem;
  font-weight: 700;
  /* Color sólido SIEMPRE visible - SIN gradientes ni transparencias */
  color: #5a67d8;
  margin: 30px 0 20px 0;
  padding: 20px;
  position: relative;
  display: inline-block;
  transition: color 0.3s ease, transform 0.3s ease, text-shadow 0.3s ease;
}

/* Línea inferior animada */
.titulo::after {
  content: '';
  position: absolute;
  bottom: 10px;
  left: 20px;
  width: 0;
  height: 4px;
  background: linear-gradient(90deg, #5a67d8, #9f7aea);
  border-radius: 2px;
  transition: width 0.4s ease;
}

.titulo:hover::after {
  width: calc(100% - 40px);
  box-shadow: 0 0 10px rgba(90, 103, 216, 0.6);
}

.titulo:hover {
  /* Solo cambia de color - SIEMPRE VISIBLE */
  color: #9f7aea;
  transform: translateX(8px);
  text-shadow: 0 2px 12px rgba(159, 122, 234, 0.5);
}

h4 {
  font-size: 1.5rem;
  color: var(--primary-dark);
  margin: 25px 0 15px 0;
  padding-left: 15px;
  border-left: 4px solid var(--primary);
  transition: all 0.3s ease;
}

h4:hover {
  border-left-width: 8px;
  padding-left: 20px;
  color: var(--secondary);
}

strong {
  color: var(--primary);
  font-weight: 600;
}

/* ============================================
   PÁRRAFOS Y CONTENIDO
   ============================================ */
.parrafo, p {
  font-size: 1.1rem;
  line-height: 1.8;
  color: var(--text-primary);
  margin: 15px 0;
  padding: 10px 20px;
  transition: all 0.3s ease;
}

p:hover {
  background: rgba(59, 130, 246, 0.05);
  border-radius: var(--radius-sm);
  transform: translateX(5px);
}

/* ============================================
   LISTAS
   ============================================ */
ul, ol {
  margin: 20px 0;
  padding-left: 40px;
}

li {
  margin: 12px 0;
  padding: 10px 15px;
  background: var(--bg-card);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-sm);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  padding-left: 35px;
}

li::before {
  content: '▶';
  position: absolute;
  left: 12px;
  color: var(--primary);
  font-size: 0.8rem;
  transition: transform 0.3s ease;
}

li:hover {
  transform: translateX(10px);
  box-shadow: var(--shadow-md);
  background: linear-gradient(90deg, rgba(59, 130, 246, 0.05) 0%, transparent 100%);
}

li:hover::before {
  transform: translateX(5px);
  color: var(--secondary);
}

/* ============================================
   SECCIONES CON CARDS
   ============================================ */
.seccion-card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: 30px;
  margin: 30px 0;
  box-shadow: var(--shadow-md);
  border: 1px solid rgba(59, 130, 246, 0.1);
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
}

.seccion-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.4s ease;
}

.seccion-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-xl);
  border-color: var(--primary);
}

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

/* ============================================
   IMÁGENES Y MULTIMEDIA
   ============================================ */
img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  margin: 20px 0;
  box-shadow: var(--shadow-md);
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  cursor: pointer;
}

img:hover {
  transform: scale(1.05);
  box-shadow: var(--shadow-xl), var(--shadow-glow);
  border-radius: var(--radius-lg);
}

/* Contenedor especial para imágenes */
.img-container {
  position: relative;
  display: inline-block;
  overflow: hidden;
  border-radius: var(--radius-md);
  margin: 20px;
}

.img-container::after {
  content: '🔍 Ver más';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background: linear-gradient(to top, rgba(0,0,0,0.7), transparent);
  color: white;
  padding: 15px;
  transform: translateY(100%);
  transition: transform 0.3s ease;
  text-align: center;
  font-weight: 600;
}

.img-container:hover::after {
  transform: translateY(0);
}

/* ============================================
   IFRAMES (VIDEOS)
   ============================================ */
iframe {
  width: 100%;
  max-width: 100%;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  margin: 30px 0;
  transition: all 0.4s ease;
  border: 3px solid transparent;
}

iframe:hover {
  transform: scale(1.02);
  box-shadow: var(--shadow-xl), 0 0 30px rgba(102, 126, 234, 0.4);
  border-color: var(--primary);
}

/* ============================================
   TABLAS
   ============================================ */
table {
  width: 100%;
  border-collapse: collapse;
  margin: 30px 0;
  background: var(--bg-card);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-md);
}

thead {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: white;
}

th {
  font-size: 1.1rem;
  padding: 15px;
  text-align: left;
  font-weight: 600;
}

td {
  font-size: 1rem;
  padding: 12px 15px;
  border-bottom: 1px solid rgba(59, 130, 246, 0.1);
  transition: all 0.3s ease;
}

tr {
  transition: all 0.3s ease;
}

tbody tr:hover {
  background: rgba(59, 130, 246, 0.05);
  transform: scale(1.01);
}

/* Espaciado especial para imágenes en tabla */
table img {
  margin: 10px auto;
  display: block;
  max-width: 200px;
}

table td {
  text-align: center;
  vertical-align: middle;
}

/* ============================================
   BOTONES
   ============================================ */
button, .btn {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: #fff;
  border: none;
  border-radius: var(--radius-md);
  padding: 12px 24px;
  box-shadow: var(--shadow-md);
  font-size: 1.1rem;
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  font-weight: 600;
  position: relative;
  overflow: hidden;
}

button::before, .btn::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.3);
  transform: translate(-50%, -50%);
  transition: width 0.6s, height 0.6s;
}

button:hover::before, .btn:hover::before {
  width: 300px;
  height: 300px;
}

button:hover, .btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-xl);
}

button:active, .btn:active {
  transform: translateY(0);
}

/* ============================================
   BADGES Y ETIQUETAS
   ============================================ */
.badge {
  display: inline-block;
  padding: 5px 12px;
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 600;
  margin: 5px;
  transition: all 0.3s ease;
}

.badge-mecanica {
  background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
  color: white;
}

.badge-electromagnetica {
  background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
  color: white;
}

.badge-transversal {
  background: linear-gradient(135deg, #43e97b 0%, #38f9d7 100%);
  color: white;
}

.badge-longitudinal {
  background: linear-gradient(135deg, #fa709a 0%, #fee140 100%);
  color: white;
}

.badge:hover {
  transform: translateY(-3px) scale(1.05);
  box-shadow: var(--shadow-lg);
}

/* ============================================
   ANIMACIONES
   ============================================ */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideIn {
  from {
    transform: translateX(-100%);
    opacity: 0;
  }
  to {
    transform: translateX(0);
    opacity: 1;
  }
}

@keyframes pulse {
  0%, 100% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.05);
  }
}

@keyframes wave {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-10px);
  }
}

/* Aplicar animaciones */
.animate-fade {
  animation: fadeIn 0.6s ease-out;
}

.animate-slide {
  animation: slideIn 0.8s ease-out;
}

.animate-pulse {
  animation: pulse 2s ease-in-out infinite;
}

/* ============================================
   EFECTOS ESPECIALES
   ============================================ */

/* Efecto de brillo en hover */
.glow-effect:hover {
  box-shadow: 0 0 20px rgba(102, 126, 234, 0.6),
              0 0 40px rgba(118, 75, 162, 0.4);
  transition: box-shadow 0.3s ease;
}

/* Efecto de onda */
.wave-effect {
  position: relative;
  overflow: hidden;
}

.wave-effect::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  background: rgba(255, 255, 255, 0.5);
  border-radius: 50%;
  transform: translate(-50%, -50%);
  transition: width 0.6s, height 0.6s;
}

.wave-effect:hover::after {
  width: 500px;
  height: 500px;
}

/* ============================================
   SCROLLBAR PERSONALIZADO
   ============================================ */
::-webkit-scrollbar {
  width: 12px;
}

::-webkit-scrollbar-track {
  background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
  background: linear-gradient(180deg, var(--primary), var(--secondary));
  border-radius: 6px;
  border: 2px solid var(--bg-secondary);
}

::-webkit-scrollbar-thumb:hover {
  background: linear-gradient(180deg, var(--primary-dark), var(--secondary-dark));
}

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */
@media (max-width: 768px) {
  main {
    padding: 20px 15px;
  }
  
  .titulo {
    font-size: 2rem;
  }
  
  h4 {
    font-size: 1.3rem;
  }
  
  .parrafo, p {
    font-size: 1rem;
  }
  
  iframe {
    height: 300px;
  }
  
  table {
    font-size: 0.9rem;
  }
  
  li {
    padding: 8px 12px;
    padding-left: 30px;
  }
}

@media (max-width: 480px) {
  .titulo {
    font-size: 1.5rem;
  }
  
  h4 {
    font-size: 1.1rem;
  }
  
  button, .btn {
    width: 100%;
    margin: 5px 0;
  }
}

/* ============================================
   UTILIDADES
   ============================================ */
.text-center {
  text-align: center;
}

.mt-1 { margin-top: 10px; }
.mt-2 { margin-top: 20px; }
.mt-3 { margin-top: 30px; }

.mb-1 { margin-bottom: 10px; }
.mb-2 { margin-bottom: 20px; }
.mb-3 { margin-bottom: 30px; }

.p-1 { padding: 10px; }
.p-2 { padding: 20px; }
.p-3 { padding: 30px; }

.shadow-hover:hover {
  box-shadow: var(--shadow-xl);
  transition: box-shadow 0.3s ease;
}