/* ==========================================
   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;
    }
}