/* ==============================
   🌑 BASE GENERAL
================================ */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body.bg-dark {
    background: radial-gradient(circle at top, #0c0c0c, #000);
    color: #ddd;
    font-family: 'Arial', sans-serif;
    line-height: 1.6;
}

/* ==============================
   🎨 VARIABLES
================================ */

:root {
    --oro: #d4af37;
}

/* ==============================
   🧭 NAVBAR PRINCIPAL
================================ */

.navbar {
    background: #000;
    border-bottom: 1px solid rgba(212, 175, 55, 0.25);
}

.nav-container {
    max-width: 1200px;
    margin: auto;
    padding: 15px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    color: var(--oro);
    text-decoration: none;
    font-weight: bold;
    letter-spacing: 1px;
}

.nav-links {
    list-style: none;
    display: flex;
    gap: 20px;
}

.nav-links a {
    color: #ccc;
    text-decoration: none;
    font-size: 0.85rem;
}

.nav-links a:hover {
    color: var(--oro);
}

/* ==============================
   ⬇ DROPDOWN
================================ */

.dropdown {
    position: relative;
}

.dropdown-content {
    display: none;
    position: absolute;
    background: #0b0b0b;
    border: 1px solid rgba(212, 175, 55, 0.3);
    top: 100%;
    left: 0;
    min-width: 180px;
    z-index: 10;
}

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

.dropdown-content a {
    display: block;
    padding: 10px;
}

.dropdown:hover .dropdown-content {
    display: block;
}

/* ==============================
   🌐 IDIOMA
================================ */

.nav-lang select {
    background: #000;
    color: #aaa;
    border: 1px solid #333;
    padding: 5px;
}

/* ==============================
   🧭 NAVEGACIÓN SECUNDARIA
================================ */

.navigation {
    padding: 15px 20px;
}

.btn-back {
    color: var(--oro);
    text-decoration: none;
    font-size: 0.8rem;
}

.btn-back:hover {
    text-decoration: underline;
}

/* ==============================
   🧠 HEADER
================================ */

.header-reprogramacion {
    text-align: center;
    padding: 50px 20px 30px;
}

.oro-texto {
    color: var(--oro);
    font-size: 2.5rem;
}

.subtitulo-cientifico {
    color: #aaa;
    font-size: 0.95rem;
    margin-top: 10px;
    font-style: italic;
}

/* ==============================
   📦 CONTENEDOR
================================ */

.container {
    max-width: 1000px;
    margin: auto;
    padding: 20px;
}

/* ==============================
   🎥 VIDEO
================================ */

.video-principal-box {
    margin-top: 30px;
}

.titulo-video {
    text-align: center;
    margin-bottom: 20px;
    color: #fff;
}

.video-descripcion {
    margin-top: 20px;
    font-size: 0.9rem;
    color: #bbb;
    text-align: center;
}

/* ==============================
   🔬 TARJETAS CONCEPTOS
================================ */

.grid-frecuencias {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 25px;
}

.card-frecuencia {
    background: #0e0e0e;
    border: 1px solid rgba(212, 175, 55, 0.25);
    border-radius: 14px;
    padding: 25px;
    text-align: center;
}

.hz-circulo {
    font-size: 2.5rem;
    margin-bottom: 10px;
}

.card-frecuencia h3 {
    color: var(--oro);
    margin-bottom: 10px;
}

.card-frecuencia p {
    font-size: 0.85rem;
    color: #aaa;
}

/* ==============================
   🔘 BOTÓN FINAL
================================ */

.btn-stop {
    border: none;
    padding: 16px 50px;
    border-radius: 40px;
    font-size: 0.9rem;
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.btn-stop:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(212, 175, 55, 0.35);
}

/* ==============================
   🦶 FOOTER
================================ */

.footer-simple {
    margin-top: 70px;
    padding: 30px 20px;
    text-align: center;
    font-size: 0.8rem;
    color: #777;
    border-top: 1px solid rgba(212, 175, 55, 0.2);
}