/* ==========================================
   CONFIGURACIÓN GENERAL & VARIABLES
   ========================================== */
:root {
  --bg-dark: #0f111a;
  --bg-card: #161925;
  --primary-glow: #00f2fe;
  --secondary-glow: #4facfe;
  --text-main: #ffffff;
  --text-muted: #a0aec0;
}

body {
  background-color: var(--bg-dark);
  color: var(--text-main);
  font-family: 'Plus Jakarta Sans', sans-serif;
  overflow-x: hidden;
  padding-top: 80px; /* Espacio para que la navbar fija no tape el contenido */
}

/* Redirección suave al hacer clic en el menú */
html {
  scroll-behavior: smooth;
  scroll-padding-top: 100px; 
}

/* ==========================================
   NAVBAR PERSONALIZADA
   ========================================== */
.custom-nav {
  background: rgba(15, 17, 26, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  padding: 12px 0;
}

/* Contenedor con scroll horizontal para los botones si no caben en pantalla */
.nav-scroll-container {
  display: flex;
  gap: 10px;
  overflow-x: auto;
  white-space: nowrap;
  width: 100%;
  padding-bottom: 5px;
}

.nav-scroll-container::-webkit-scrollbar {
  height: 4px;
}

.nav-scroll-container::-webkit-scrollbar-thumb {
  background: linear-gradient(to right, var(--secondary-glow), var(--primary-glow));
  border-radius: 10px;
}

/* Botones de navegación */
.btn-nav {
  background: rgba(255, 255, 255, 0.03);
  color: var(--text-main) !important;
  border: 1px solid rgba(255, 255, 255, 0.1);
  padding: 8px 18px;
  font-weight: 600;
  font-size: 0.9rem;
  border-radius: 30px;
  transition: all 0.3s ease;
}

.btn-nav:hover {
  background: linear-gradient(135deg, var(--secondary-glow), var(--primary-glow));
  border-color: transparent;
  box-shadow: 0 0 15px rgba(0, 242, 254, 0.4);
  transform: translateY(-2px);
}

/* ==========================================
   HEADER PRINCIPAL
   ========================================== */
.main-header {
  padding: 60px 0 40px 0;
  background: radial-gradient(circle at top, rgba(79, 172, 254, 0.15) 0%, transparent 60%);
}

.main-header h1 {
  font-size: 2.8rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: -1px;
  background: linear-gradient(135deg, #fff 30%, var(--primary-glow));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.main-header .subtitle {
  color: var(--text-muted);
  font-size: 1.1rem;
  margin-top: 10px;
}

/* ==========================================
   SECCIÓN DE IFRAMES (VISUALIZADORES)
   ========================================== */
.content-wrapper {
  padding: 0 4%;
}

.iframe-section {
  display: flex;
  flex-direction: column;
  gap: 40px;
}

/* Tarjeta contenedora de cada iframe */
.iframe-card {
  background-color: var(--bg-card);
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: 16px;
  padding: 20px;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
  transition: border-color 0.3s ease;
}

.iframe-card:hover {
  border-color: rgba(0, 242, 254, 0.3);
}

/* Etiqueta de la fase arriba del documento */
.badge-fase {
  display: inline-block;
  background: rgba(0, 242, 254, 0.1);
  color: var(--primary-glow);
  padding: 6px 14px;
  font-size: 0.85rem;
  font-weight: 600;
  border-radius: 8px;
  margin-bottom: 15px;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.iframe-card iframe {
  width: 100%;
  height: 750px; /* Reducido un poco de 1500px para mejorar la usabilidad, puedes cambiarlo */
  border-radius: 8px;
  background-color: #fff; /* Fondo blanco interno para los PDFs antes de cargar */
}

/* ==========================================
   ASIDE (COLUMNA DE CONCEPTOS)
   ========================================== */
.info-section {
  padding-left: 30px;
}

/* Hace que la lista se quede fija al hacer scroll en pantallas grandes */
.sticky-aside {
  position: sticky;
  top: 110px;
  background: linear-gradient(145deg, #161925, #0f111a);
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: 20px;
  padding: 30px;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
}

.aside-title {
  font-size: 1.4rem;
  font-weight: 800;
  margin-bottom: 25px;
  color: var(--primary-glow);
  text-transform: uppercase;
  border-bottom: 2px solid rgba(255, 255, 255, 0.05);
  padding-bottom: 10px;
}

.concept-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 15px;
}

.concept-list li {
  position: relative;
  padding-left: 20px;
}

/* Pequeño punto decorativo brillante antes de cada concepto */
.concept-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 6px;
  height: 6px;
  background-color: var(--secondary-glow);
  border-radius: 50%;
  box-shadow: 0 0 8px var(--secondary-glow);
}

.concept-list h3 {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-muted);
  margin: 0;
  transition: color 0.2s ease;
}

.concept-list li:hover h3 {
  color: var(--text-main);
  cursor: default;
}

/* ==========================================
   RESPONSIVO (Pantallas medianas y chicas)
   ========================================== */
@media (max-width: 991px) {
  .info-section {
    padding-left: 12px;
    margin-top: 40px;
  }
  .sticky-aside {
    position: relative;
    top: 0;
  }
  .main-header h1 {
    font-size: 2rem;
  }
}