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

        body {
            font-family: 'Arial', sans-serif;
            overflow-x: hidden;
        }

        .wrapper {
            position: relative;
            width: 100%;
            min-height: 100vh;
            background-image: url('https://login.usat.lookproxy.com/public/login/images/background-usat.jpg');
            background-size: cover;
            background-position: center;
            background-repeat: no-repeat;
            background-attachment: fixed;
        }

        .wrapper::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background-color: rgba(0, 0, 0, 0.45);
        }

        .page-main {
            position: relative;
            z-index: 10;
            padding: 30px 50px;
        }

        /* Header */
        .formulario-top {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 60px;
        }

        .logo-img {
            display: flex;
            align-items: center;
            gap: 30px;
        }

        .logo-img img {
            width: 880px;
            height: auto;
        }

        .separador-vertical {
            width: 3px;
            height: 120px;
            background-color: white;
        }

        .biblioteca-title {
            color: white;
            font-size: 2.8rem;
            font-weight: bold;
            text-transform: uppercase;
            letter-spacing: 2px;
            line-height: 1.1;
        }

        .footer-social {
            display: flex;
            gap: 20px;
        }

        .footer-social a {
            color: white;
            font-size: 2.2rem;
            transition: transform 0.3s;
            text-decoration: none;
        }

        .footer-social a:hover {
            transform: scale(1.2);
        }

        /* Welcome Text */
        .formulario-description {
            text-align: center;
            color: white;
            font-size: 1.2rem;
            font-weight: bold;
            text-transform: uppercase;
            letter-spacing: 2px;
            margin: 80px 0;
            padding: 0 20px;
        }

        /* Buttons Container */
        .formulario-botones {
            display: flex;
            justify-content: center;
            gap: 120px;
            margin: 80px 0;
            flex-wrap: wrap;
        }

        .formulario-botones > div {
            flex: 0 0 auto;
        }

        .contenedor1,
        .contenedor2 {
            position: relative;
            width: 550px;
            height: 180px;
            margin-bottom: 20px;
        }

        .contenedor-clickable {
            cursor: pointer;
        }

        .btn1 {
            width: 100%;
            height: 100%;
            object-fit: cover;
            border-radius: 70px;
            box-shadow: 0 12px 30px rgba(0, 0, 0, 0.5);
            transition: transform 0.3s, box-shadow 0.3s;
            cursor: pointer;
        }

        .btn1:hover {
            transform: translateY(-8px);
            box-shadow: 0 18px 40px rgba(0, 0, 0, 0.6);
        }

        /* Línea divisoria vertical dentro del botón 
        .contenedor1::after,
        .contenedor2::after {
            content: '';
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            width: 2px;
            height: 60%;
            background-color: rgba(255, 255, 255, 0.4);
            pointer-events: none;
        }
        */

        .centrado1,
        .centrado2 {
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            width: 100%;
            text-align: center;
            padding: 0 100px;
        }

        .centrado1 a,
        .centrado2 a {
            text-decoration: none;
        }

        .titulo-btn1,
        .titulo-btn2 {
            font-size: 1.5rem;
            font-weight: bold;
            color: #FFD700;
            text-transform: uppercase;
            letter-spacing: 1px;
            margin: 1;
            line-height: 1.2;
        }

        .subtitulo-btn1,
        .subtitulo-btn2 {
            font-size: 0.85rem;
            font-style: italic;
            color: #FFD700;
            display: block;
            margin-top: 5px;
            margin-left: 15px;
        }

        /* Info Icons */
        .fa-info-circle {
            color: white;
            font-size: 1.8rem;
            cursor: pointer;
            margin-left: 20px;
            transition: opacity 0.3s;
        }

        .fa-info-circle:hover {
            opacity: 0.8;
        }

        /* Collapse - Oculto por defecto */
        .collapse {
            display: none;
            background-color: rgba(255, 255, 255, 0.95);
            padding: 15px;
            border-radius: 10px;
            margin-top: 15px;
        }

        .collapse.in {
            display: block;
        }

        .titulo-help {
            font-weight: bold;
            font-size: 1.1rem;
            color: #333;
            margin-bottom: 10px;
        }

        .text-help {
            font-size: 0.95rem;
            color: #555;
            margin: 0;
        }

        .text-next {
            color: white;
            font-size: 1rem;
            margin-top: 20px;
            text-align: center;
        }

        .text-next a {
            color: white;
            text-decoration: underline;
        }

        .text-next a:hover {
            opacity: 0.8;
        }

        /* Form */
        .formulario {
            background-color: rgba(255, 255, 255, 0.95);
            padding: 30px;
            border-radius: 15px;
            margin-top: 20px;
        }

        .form-top {
            text-align: center;
            margin-bottom: 25px;
        }

        .form-top h3 {
            font-size: 1.8rem;
            color: #333;
            margin-bottom: 10px;
        }

        .form-top p {
            color: #666;
            font-size: 1rem;
        }

        .form-bottom {
            padding: 0 20px;
        }

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

        .form-control {
            width: 100%;
            padding: 15px;
            border: 1px solid #ddd;
            border-radius: 5px;
            font-size: 1rem;
        }

        .form-control:focus {
            outline: none;
            border-color: #CC0000;
        }

        .sr-only {
            position: absolute;
            width: 1px;
            height: 1px;
            padding: 0;
            margin: -1px;
            overflow: hidden;
            clip: rect(0,0,0,0);
            border: 0;
        }

        .btn {
            width: 100%;
            padding: 15px;
            background-color: #CC0000;
            color: white;
            border: none;
            border-radius: 5px;
            font-size: 1.1rem;
            font-weight: bold;
            cursor: pointer;
            transition: background-color 0.3s;
        }

        .btn:hover {
            background-color: #a00000;
        }

        /* Footer */
        .powered_by {
            text-align: center;
            margin-top: 60px;
            padding: 20px 0;
        }

        .powered_by h6 {
            color: white;
            font-size: 1rem;
            margin: 0;
        }

        .powered_by a {
            color: white;
            text-decoration: underline;
        }

        .powered_by a:hover {
            opacity: 0.8;
        }

        /* Responsive */
        @media (max-width: 1400px) {
            .formulario-botones {
                gap: 80px;
            }

            .contenedor1,
            .contenedor2 {
                width: 480px;
                height: 160px;
            }
        }

        @media (max-width: 1200px) {
            .formulario-botones {
                flex-direction: column;
                align-items: center;
                gap: 50px;
            }

            .contenedor1,
            .contenedor2 {
                width: 500px;
            }
        }

        @media (max-width: 768px) {
            .page-main {
                padding: 20px 30px;
            }

            .formulario-top {
                flex-direction: column;
                gap: 25px;
                margin-bottom: 40px;
            }

            .logo-img {
                flex-direction: column;
                gap: 15px;
            }

            .separador-vertical {
                display: none;
            }

            .logo-img img {
                width: 200px;
            }

            .biblioteca-title {
                font-size: 1.8rem;
                text-align: center;
            }

            .formulario-description {
                font-size: 1.4rem;
                margin: 50px 0;
            }

            .contenedor1,
            .contenedor2 {
                width: 100%;
                max-width: 450px;
                height: 150px;
            }

            .centrado1,
            .centrado2 {
                padding: 0 120px;
            }

            .titulo-btn1,
            .titulo-btn2 {
                font-size: 1.8rem;
            }

            .subtitulo-btn1 {
                font-size: 0.85rem;
            }
        }

        @media (max-width: 480px) {
            .logo-img img {
                width: 160px;
            }

            .biblioteca-title {
                font-size: 1.4rem;
            }

            .formulario-description {
                font-size: 1.1rem;
                margin: 40px 0;
            }

            .contenedor1,
            .contenedor2 {
                width: 100%;
                height: 140px;
            }

            .centrado1,
            .centrado2 {
                padding: 0 100px;
            }

            .titulo-btn1,
            .titulo-btn2 {
                font-size: 1.5rem;
            }

            .subtitulo-btn1 {
                font-size: 0.75rem;
            }

            .formulario {
                padding: 20px;
            }

            .form-top h3 {
                font-size: 1.5rem;
            }
        }