:root {
            --bg: #050505;
            --card: #0d0d0d;
            --accent: #865DFF; /* Adaptado al color de tu app */
            --accent-dim: rgba(134, 93, 255, 0.15);
            --text: #ffffff;
            --text-dim: #888888;
            --border: rgba(255, 255, 255, 0.08);
            --error: #ff4d4d;
        }

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

        body {
            font-family: 'Inter', sans-serif;
            background-color: var(--bg);
            color: var(--text);
            display: flex;
            justify-content: center;
            align-items: center;
            min-height: 100vh;
            overflow-x: hidden;
        }

        /* Decorative Background */
        .bg-glow {
            position: fixed;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            width: 80vw;
            height: 80vh;
            background: radial-gradient(circle, rgba(134, 93, 255, 0.1) 0%, transparent 70%);
            pointer-events: none;
            z-index: 0;
        }

        .auth-container {
            width: 100%;
            max-width: 480px; /* Un poco más ancho para acomodar el grid de 4 */
            padding: 40px;
            background: var(--card);
            border: 1px solid var(--border);
            border-radius: 24px;
            box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5);
            z-index: 1;
            position: relative;
            backdrop-filter: blur(10px);
        }

        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            margin-bottom: 30px;
            justify-content: center;
        }

        .logo svg {
            width: 32px;
            height: 32px;
            color: var(--accent);
        }

        .logo span {
            font-size: 24px;
            font-weight: 800;
            letter-spacing: -1px;
            background: linear-gradient(to right, #fff, var(--accent));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        h1 {
            font-size: 28px;
            font-weight: 700;
            margin-bottom: 8px;
            text-align: center;
        }

        p.subtitle {
            color: var(--text-dim);
            font-size: 14px;
            text-align: center;
            margin-bottom: 32px;
        }

        .alert {
            background: rgba(255, 77, 77, 0.1);
            color: var(--error);
            padding: 12px;
            border-radius: 12px;
            border: 1px solid rgba(255, 77, 77, 0.2);
            font-size: 14px;
            margin-bottom: 20px;
            display: none;
            text-align: center;
        }

        .input-group {
            margin-bottom: 20px;
        }

        label {
            display: block;
            font-size: 12px;
            font-weight: 600;
            color: var(--text-dim);
            margin-bottom: 8px;
            text-transform: uppercase;
            letter-spacing: 0.5px;
        }

        input {
            width: 100%;
            padding: 14px 16px;
            background: rgba(255, 255, 255, 0.03);
            border: 1px solid var(--border);
            border-radius: 12px;
            color: #fff;
            font-size: 15px;
            outline: none;
            transition: all 0.2s;
        }

        input:focus {
            border-color: var(--accent);
            background: rgba(255, 255, 255, 0.05);
            box-shadow: 0 0 0 4px var(--accent-dim);
        }

        .btn-primary {
            width: 100%;
            padding: 14px;
            background: var(--accent);
            border: none;
            border-radius: 12px;
            color: #fff;
            font-size: 16px;
            font-weight: 700;
            cursor: pointer;
            transition: all 0.2s;
            margin-top: 10px;
        }

        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 20px var(--accent-dim);
        }

        .btn-primary:disabled {
            opacity: 0.5;
            cursor: not-allowed;
            transform: none;
        }

        .switch-mode {
            margin-top: 24px;
            text-align: center;
            font-size: 14px;
            color: var(--text-dim);
        }

        .switch-mode a {
            color: var(--accent);
            text-decoration: none;
            font-weight: 600;
        }

        /* Marketing Grid (Modificado para 8 opciones) */
        .marketing-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 10px;
            margin-bottom: 24px;
        }

        @media (max-width: 480px) {
            .marketing-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        .marketing-item {
            background: rgba(255, 255, 255, 0.03);
            border: 1px solid var(--border);
            padding: 12px 8px;
            border-radius: 12px;
            text-align: center;
            cursor: pointer;
            transition: all 0.2s;
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 6px;
        }

        .marketing-item:hover {
            border-color: rgba(255, 255, 255, 0.2);
            background: rgba(255, 255, 255, 0.06);
        }

        .marketing-item.selected {
            border-color: var(--accent);
            background: var(--accent-dim);
            color: var(--accent);
        }

        .marketing-item svg {
            width: 20px;
            height: 20px;
        }

        .marketing-item span {
            font-size: 11px;
            font-weight: 600;
        }

        #register-section {
            display: none;
        }