html, body {
            height: 100%;
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            width: 100vw;
            overflow-x: hidden;
        }
        /* Video de fondo */
        #videoFondo {
            position: fixed;
            top: 0;
            left: 0;
            width: 100vw;
            height: 100vh;
            object-fit: cover;
            z-index: -1;
            pointer-events: none;
            background: #222;
        }
        .oscurecer {
            position: fixed;
            top: 0;
            left: 0;
            width: 100vw;
            height: 100vh;
            background: rgba(0,0,0,0.5);
            z-index: 0;
        }
        /* HEADER */
        header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100vw;
            min-width: 0;
            background: rgba(10, 20, 40, 0.8);
            color: #fff;
            z-index: 2;
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 0 2vw;
            height: 60px;
            box-shadow: 0 2px 8px rgba(0,0,0,0.25);
            box-sizing: border-box;
        }
        .logo {
            font-size: 1.3em;
            font-weight: bold;
            letter-spacing: 1px;
            white-space: nowrap;
        }
        nav {
            display: flex;
            gap: 2em;
        }
        nav a {
            color: #fff;
            text-decoration: none;
            font-size: 1em;
            padding: 8px 12px;
            border-radius: 5px;
            transition: background 0.2s;
        }
        nav a:hover {
            background: rgba(255,255,255,0.1);
        }
        .menu-icon {
            display: none;
            font-size: 2em;
            cursor: pointer;
            background: none;
            border: none;
            color: #fff;
        }
        /* Menú responsivo */
        @media (max-width: 900px) {
            header {
                padding: 0 1vw;
            }
            nav {
                gap: 1em;
            }
        }
        @media (max-width: 700px) {
            header {
                flex-wrap: wrap;
                height: auto;
                min-height: 60px;
                padding: 0 1vw;
            }
            .logo {
                font-size: 1.1em;
            }
            nav {
                display: none;
                flex-direction: column;
                align-items: flex-end;
                background: rgba(10,20,40,0.97);
                position: absolute;
                top: 60px;
                right: 0;
                width: 180px;
                gap: 0;
                box-shadow: 0 2px 10px #0008;
            }
            nav.active {
                display: flex;
            }
            .menu-icon {
                display: block;
            }
        }
        /* CONTENIDO PRINCIPAL */
        .contenido {
            position: relative;
            z-index: 1;
            color: #fff;
            text-align: center;
            margin-top: 25vh;
            font-size: 2em;
            text-shadow: 2px 2px 10px #000;
            font-family: 'Segoe UI', Arial, sans-serif;
            padding: 2em 1em;
        }
        @media (max-width: 600px) {
            .contenido {
                font-size: 1.2em;
                margin-top: 15vh;
            }
        }
        /* FOOTER */
        footer {
            position: fixed;
            left: 0;
            bottom: 0;
            width: 100vw;
            background: rgba(10, 20, 40, 0.82);
            color: #fff;
            z-index: 2;
            font-size: 0.95em;
            text-align: center;
            padding: 0.6em 1.5em 0.6em 1.5em;
            box-shadow: 0 -2px 8px rgba(0,0,0,0.18);
            letter-spacing: 0.02em;
            box-sizing: border-box;
        }
        body {
            padding-top: 60px;
            padding-bottom: 48px;
        }
        @media (max-width: 700px) {
            footer {
                font-size: 0.85em;
                padding: 0.6em 0.5em 0.6em 0.5em;
            }
        }