/* ================================
   VARIABLES DE COLOR Y FUENTE
================================ */
:root {
    --bg-color: #0d0d0d;
    --primary-color: #00f7ff; /* Neón principal */
    --secondary-color: #ff00d4; /* Neón secundario */
    --accent-color: #00ff88; /* Verde neón */
    --text-color: #ffffff;
    --text-muted: #b3b3b3;
    --font-main: 'Poppins', sans-serif;
}

/* ================================
   RESETEO BÁSICO
================================ */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-main);
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    scroll-behavior: smooth;
}

/* ================================
   ENCABEZADO
================================ */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 5%;
    background: rgba(13, 13, 13, 0.8);
    backdrop-filter: blur(8px);
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 2px solid var(--primary-color);
    box-shadow: 0 0 10px var(--primary-color);
}

header .logo img {
    height: 60px;
    filter: drop-shadow(0 0 10px var(--primary-color));
    transition: transform 0.3s ease;
}

header .logo img:hover {
    transform: scale(1.05);
}

nav ul {
    display: flex;
    gap: 30px;
    list-style: none;
}

nav ul li a {
    color: var(--text-color);
    text-decoration: none;
    font-weight: 600;
    transition: color 0.3s ease, text-shadow 0.3s ease;
}

nav ul li a:hover {
    color: var(--primary-color);
    text-shadow: 0 0 8px var(--primary-color);
}

/* ================================
   VIDEO INTRO
================================ */
.intro-video {
    text-align: center;
    margin: 20px auto;
    padding: 20px;
}

.video-wrapper {
    position: relative;
    display: block;
    border: 3px solid var(--primary-color);
    border-radius: 15px;
    box-shadow: 0 0 20px var(--primary-color);
    overflow: hidden;
    max-width: 800px; /* Tamaño máximo en pantallas grandes */
    margin: 0 auto;
}

/* Hacemos que el video mantenga la proporción */
.video-wrapper video {
    width: 100%;
    height: auto;
    display: block;
    aspect-ratio: 16/9; /* Mantiene la proporción */
    object-fit: cover; /* Ajusta el contenido al contenedor */
    border-radius: 15px;
}

/* ================================
   RESPONSIVIDAD DEL VIDEO
================================ */
@media (max-width: 1024px) {
    .video-wrapper {
        max-width: 700px;
    }
}

@media (max-width: 768px) {
    .video-wrapper {
        max-width: 95%;
    }

    .video-wrapper video {
        aspect-ratio: 16/9; /* Mantiene la proporción */
        object-fit: contain; /* Ajuste perfecto en móviles */
    }
}

@media (max-width: 480px) {
    .video-wrapper {
        max-width: 100%;
        border-width: 2px;
    }

    .video-wrapper video {
        aspect-ratio: 16/9;
        object-fit: contain;
    }
}

/* ================================
   HERO
================================ */
.hero {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 50px 5%;
    gap: 40px;
    background: linear-gradient(135deg, #0d0d0d, #1a1a1a);
}

.hero-text {
    flex: 1;
}

.hero-text h1 {
    font-size: 2.8rem;
    color: var(--text-color);
}

.hero-text h1 span {
    color: var(--primary-color);
    text-shadow: 0 0 10px var(--primary-color);
}

.hero-text p {
    font-size: 1.1rem;
    color: var(--text-muted);
    margin: 15px 0;
}

.hero-img {
    flex: 1;
    text-align: center;
}

.hero-img img {
    max-width: 90%;
    filter: drop-shadow(0 0 15px var(--primary-color));
}

/* Botón principal */
.btn {
    display: inline-block;
    padding: 12px 25px;
    background: var(--primary-color);
    color: var(--bg-color);
    font-weight: bold;
    border-radius: 30px;
    text-decoration: none;
    box-shadow: 0 0 15px var(--primary-color);
    transition: transform 0.2s, background 0.3s;
}

.btn:hover {
    background: var(--secondary-color);
    box-shadow: 0 0 20px var(--secondary-color);
    transform: scale(1.05);
}

/* ================================
   LECCIONES DESTACADAS
================================ */
.lecciones {
    text-align: center;
    padding: 60px 5%;
    background-color: #111;
}

.lecciones h2 {
    font-size: 2rem;
    color: var(--primary-color);
    text-shadow: 0 0 8px var(--primary-color);
    margin-bottom: 30px;
}

.cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 25px;
}

.card {
    background: #1a1a1a;
    padding: 25px;
    border-radius: 15px;
    box-shadow: 0 0 15px var(--primary-color);
    transition: transform 0.3s ease;
}

.card:hover {
    transform: translateY(-8px);
}

.card h3 {
    font-size: 1.3rem;
    margin-bottom: 15px;
    color: var(--secondary-color);
}

.card p {
    font-size: 1rem;
    color: var(--text-muted);
    margin-bottom: 20px;
}

/* ================================
   EJERCICIOS INTERACTIVOS
================================ */
.ejercicios {
    padding: 60px 5%;
    text-align: center;
    background-color: #0d0d0d;
}

.ejercicios h2 {
    font-size: 2rem;
    color: var(--accent-color);
    text-shadow: 0 0 8px var(--accent-color);
    margin-bottom: 20px;
}

/* ================================
   FORMULARIO DE CONTACTO
================================ */
.contacto {
    padding: 60px 5%;
    text-align: center;
    background-color: #1a1a1a;
}

.contacto h2 {
    color: var(--secondary-color);
    text-shadow: 0 0 8px var(--secondary-color);
    margin-bottom: 30px;
}

.contacto form {
    max-width: 500px;
    margin: auto;
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.contacto input,
.contacto textarea {
    padding: 12px;
    border-radius: 8px;
    border: none;
    outline: none;
    font-size: 1rem;
    background: #222;
    color: var(--text-color);
    box-shadow: 0 0 10px var(--primary-color);
}

.contacto button {
    padding: 12px;
    background: var(--primary-color);
    color: var(--bg-color);
    border: none;
    border-radius: 30px;
    font-weight: bold;
    cursor: pointer;
    box-shadow: 0 0 15px var(--primary-color);
    transition: background 0.3s ease;
}

.contacto button:hover {
    background: var(--secondary-color);
    box-shadow: 0 0 20px var(--secondary-color);
}

/* ================================
   FOOTER
================================ */
footer {
    text-align: center;
    padding: 20px;
    background-color: #0d0d0d;
    color: var(--text-muted);
    border-top: 2px solid var(--primary-color);
    box-shadow: 0 0 15px var(--primary-color);
}

/* ================================
   RESPONSIVIDAD
================================ */
@media (max-width: 768px) {
    .hero {
        flex-direction: column;
        text-align: center;
    }

    nav ul {
        flex-direction: column;
        gap: 15px;
    }

    header {
        flex-direction: column;
        align-items: center;
    }
}