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

        :root {
            --black: #0a0a0a;
            --white: #fafafa;
            --accent: #00aaff; 
            --gray: #666;
        }

        body {
            font-family: 'JetBrains Mono', monospace;
            background: var(--white);
            color: var(--black);
            overflow-x: hidden;
            line-height: 1.5;
            cursor: default;
        }

        a {
            cursor: pointer;
        }

        /* ==================== NAVBAR ==================== */
        .navbar {
            position: fixed;
            top: 0;
            width: 100%;
            background: var(--black);
            border-bottom: 2px solid var(--accent);
            padding: 1rem 2rem;
            z-index: 1000;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .navbar-brand {
            font-family: 'Archivo Black', sans-serif;
            font-size: 1.5rem;
            color: var(--white);
            text-decoration: none;
        }

        .navbar-menu {
            display: flex;
            gap: 2rem;
        }

        .navbar-item {
            color: var(--white);
            text-decoration: none;
            font-weight: 700;
            transition: color 0.3s ease;
        }

        .navbar-item:hover {
            color: var(--accent);
        }

        .navbar-burger {
            display: none;
            flex-direction: column;
            gap: 5px;
            background: transparent;
            border: none;
            cursor: pointer;
        }

        .navbar-burger span {
            width: 25px;
            height: 3px;
            background: var(--white);
            transition: all 0.3s ease;
        }

        @media (max-width: 768px) {
            .navbar-menu {
                position: fixed;
                top: 60px;
                left: 0;
                right: 0;
                background: var(--black);
                flex-direction: column;
                padding: 2rem;
                gap: 1rem;
                transform: translateX(100%);
                transition: transform 0.3s ease;
            }

            .navbar-menu.is-active {
                transform: translateX(0);
            }

            .navbar-burger {
                display: flex;
            }
        }

        /* ==================== SECCIONES BASE ==================== */
        /* Usa .section-light para fondo blanco o .section-dark para fondo negro */
        
        .section {
            padding: 6rem 2rem;
        }

        .section-light {
            background: var(--white);
            color: var(--black);
            max-width: 1400px;
            margin: 0 auto;
        }

        .section-dark {
            background: var(--black);
            color: var(--white);
            width: 100%;
            max-width: 100%;
        }

        .section-dark .container {
            max-width: 1400px;
            margin: 0 auto;
            padding: 0 2rem;
        }

        /* ==================== HERO ==================== */
        .hero {
            min-height: 100vh;
            display: flex;
            flex-direction: column;
            justify-content: center;
            position: relative;
            overflow: hidden;
            margin-top: 60px;
        }

        .hero::before {
            content: '23';
            position: absolute;
            font-family: 'Archivo Black', sans-serif;
            font-size: 60vw;
            opacity: 0.03;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            z-index: 0;
            pointer-events: none;
        }

        .hero-content {
            position: relative;
            z-index: 1;
            max-width: 1400px;
            margin: 0 auto;
            width: 100%;
        }

        .main-title {
            font-family: 'Archivo Black', sans-serif;
            font-size: clamp(3rem, 10vw, 8rem);
            line-height: 0.9;
            letter-spacing: -0.03em;
            margin-bottom: 2rem;
            animation: slideUp 1s ease-out;
        }

        .accent {
            color: var(--accent);
        }

        .tagline {
            font-size: clamp(1.2rem, 3vw, 2rem);
            font-weight: 700;
            max-width: 800px;
            margin-bottom: 3rem;
            animation: slideUp 1s ease-out 0.2s backwards;
        }

        .cta {
            display: inline-block;
            padding: 1.5rem 3rem;
            background: var(--black);
            color: var(--white);
            text-decoration: none;
            font-weight: 700;
            font-size: 1.1rem;
            transition: all 0.3s ease;
            border: 3px solid var(--black);
            animation: slideUp 1s ease-out 0.4s backwards;
        }

        .cta:hover {
            background: var(--white);
            color: var(--black);
            transform: translate(5px, -5px);
            box-shadow: -5px 5px 0 var(--accent);
        }

        .scroll-indicator {
            position: absolute;
            bottom: 3rem;
            left: 50%;
            transform: translateX(-50%);
            font-size: 0.9rem;
            font-weight: 700;
            animation: bounce 2s ease-in-out infinite;
        }

        /* ==================== TÍTULOS Y TEXTOS ==================== */
        .section-title {
            font-family: 'Archivo Black', sans-serif;
            font-size: clamp(3rem, 8vw, 6rem);
            margin-bottom: 3rem;
            line-height: 1;
            letter-spacing: -0.02em;
        }

        .big-number {
            font-family: 'Archivo Black', sans-serif;
            font-size: clamp(4rem, 10vw, 8rem);
            line-height: 1;
            color: var(--accent);
        }

        .about-text p {
            font-size: 1.2rem;
            margin-bottom: 1.5rem;
            line-height: 1.8;
        }

        /* ==================== LAYOUTS ==================== */
        .about-grid {
            display: grid;
            grid-template-columns: 1fr 2fr;
            gap: 4rem;
            align-items: start;
        }

        .grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 4rem;
            margin-top: 4rem;
        }

        @media (max-width: 768px) {
            .about-grid {
                grid-template-columns: 1fr;
            }
        }

        /* ==================== CARDS ==================== */
        .card {
            border-top: 4px solid var(--accent);
            padding-top: 2rem;
        }

        .card h3 {
            font-family: 'Archivo Black', sans-serif;
            font-size: 2rem;
            margin-bottom: 1rem;
        }

        .card p {
            font-size: 1.1rem;
            line-height: 1.7;
            opacity: 0.8;
        }
        .card p a {
            color: var(--white);
            text-decoration: none;
            font-weight: 700;
        }
        .card p a:hover {
            color: var(--accent);
            text-decoration: underline;
        }
        .section-dark a {
            color: var(--white);  /* Cambiado de var(--accent) a var(--white) */
            font-weight: 700;
            text-decoration: none;
        }

        .section-dark a:hover {
            color: var(--accent);  /* Verde solo al pasar el ratón */
            text-decoration: underline;
        }

        /* ==================== STATS ==================== */
        .stats {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 3rem;
            margin-top: 4rem;
        }

        .stat {
            text-align: center;
        }

        .stat-number {
            font-family: 'Archivo Black', sans-serif;
            font-size: 4rem;
            color: var(--accent);
            display: block;
            margin-bottom: 0.5rem;
        }

        .stat-label {
            font-size: 1rem;
            text-transform: uppercase;
            letter-spacing: 0.1em;
            opacity: 0.7;
        }

        /* ==================== QR CODE ==================== */
        .qr-container {
            margin-top: 2rem;
            display: flex;
            flex-direction: column;
            align-items: flex-start;
            gap: 1rem;
        }

        .qr-code {
            width: 200px;
            height: 200px;
            border: 4px solid var(--black);
            padding: 0.5rem;
            background: var(--white);
            transition: transform 0.3s ease;
        }

        .qr-code:hover {
            transform: scale(1.05);
        }

        .public-key {
            font-family: 'JetBrains Mono', monospace;
            font-size: 0.85rem;
            background: var(--black);
            color: var(--accent);
            padding: 0.75rem 1rem;
            word-break: break-all;
            display: block;
            border-left: 4px solid var(--accent);
            font-weight: 700;
        }

        /* ==================== CONTACT LINKS ==================== */
        .contact-links {
            display: flex;
            flex-direction: column;
            gap: 2rem;
            margin-top: 3rem;
        }

.contact-link {
    font-family: 'Archivo Black', sans-serif;
    font-size: clamp(2rem, 5vw, 4rem);
    color: var(--white);
    text-decoration: none;
    display: inline-block;
    position: relative;
    transition: transform 0.3s ease;
    width: fit-content;
}

.contact-link::after {
    content: "";
    position: absolute;
    left: 0;
    bottom: -6px;   /* separa la línea del texto */
    width: 0%;
    height: 4px;
    background: var(--accent);
    transition: width 0.3s ease;
}

.contact-link:hover {
    transform: translateX(20px);
}

.contact-link:hover::after {
    width: 100%;
}

/* ==================== DEVICES ==================== */
.devices-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 3rem;
    margin-top: 3rem;
}

.device-card {
    border: 3px solid var(--accent);
    padding: 2rem;
    background: var(--black);
    transition: all 0.3s ease;
}

.device-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 0 var(--accent);
}

.device-image {
    width: 100%;
    height: 180px;
    object-fit: cover;
    margin-bottom: 1.5rem;
    border: 2px solid var(--accent);
    background: var(--white);
}

.device-card h3 {
    font-family: 'Archivo Black', sans-serif;
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--white);
}

.device-price {
    font-family: 'Archivo Black', sans-serif;
    font-size: 2rem;
    color: var(--accent);
    margin-bottom: 1rem;
}

.device-desc {
    font-size: 1rem;
    line-height: 1.6;
    opacity: 0.8;
    margin-bottom: 2rem;
    min-height: 3em;
}

.device-links {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.device-link {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    background: transparent;
    color: var(--white);
    text-decoration: none;
    font-weight: 700;
    font-size: 0.9rem;
    border: 2px solid var(--white);
    transition: all 0.3s ease;
}

.device-link:hover {
    background: var(--accent);
    border-color: var(--accent);
    color: var(--black);
    transform: translateX(3px);
}
        /* ==================== FOOTER ==================== */
        .footer {
            padding: 4rem 2rem;
            text-align: center;
            border-top: 2px solid var(--black);
            font-size: 0.9rem;
            color: var(--gray);
            background: var(--white);
        }
        .footer-logo {
    width: 40%;
    max-width: 200px;     /* evita que se haga enorme en pantallas grandes */
    height: auto;
    display: block;
    margin: 0 auto 1.5rem auto;  /* centrado y espacio debajo */
    opacity: 0.95;
}

        /* ==================== ANIMACIONES ==================== */
        @keyframes slideUp {
            from {
                opacity: 0;
                transform: translateY(40px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        @keyframes bounce {
            0%, 100% {
                transform: translateX(-50%) translateY(0);
            }
            50% {
                transform: translateX(-50%) translateY(-10px);
            }
        }

        #network-map {
    height: 600px;
    width: 100%;
    border: 3px solid var(--accent);
    margin-top: 3rem;
}

/* Popups oscuros estilo SierraSur */
.leaflet-popup-content-wrapper {
    background: var(--black);
    color: var(--white);
    border: 2px solid var(--accent);
}

.leaflet-popup-tip {
    background: var(--black);
}