/* Reset y scroll suave */
    * { 
      box-sizing: border-box; 
      margin: 0; 
      padding: 0; 
    }
    
    html { 
      scroll-behavior: smooth; 
    }
    
    body {
      font-family: 'Poppins', sans-serif;
      color: #fff;
      line-height: 1.6;
      min-height: 100vh;
      display: flex;
      flex-direction: column;
      /* Mismo fondo que la página principal */
      background: url('https://noticias.unsam.edu.ar/wp-content/uploads/2019/02/lsaweb-01.jpg') center/cover no-repeat fixed;
    }

    /* Overlay oscuro */
    body::before {
      content: '';
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: rgba(0,0,0,0.6);
      backdrop-filter: blur(8px);
      z-index: -1;
    }

    /* Navegación consistente con la página principal */
    nav {
      position: fixed;
      top: 0;
      left: 0;
      right: 0;
      z-index: 1000;
      background: rgba(0,0,0,0.3);
      backdrop-filter: blur(15px);
      border-bottom: 1px solid rgba(255,255,255,0.1);
      padding: 15px 20px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      transition: all 0.3s ease;
    }

    .nav-logo {
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .nav-logo img {
      width: 50px;
      height: 50px;
      border-radius: 50%;
    }

    .nav-logo span {
      font-weight: 600;
      font-size: 1.2rem;
      color: #fff;
    }

    .btn-back {
      background: rgba(255,255,255,0.1);
      border: 2px solid rgba(255,255,255,0.3);
      color: #fff;
      padding: 10px 20px;
      border-radius: 25px;
      text-decoration: none;
      font-weight: 600;
      transition: all 0.3s ease;
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .btn-back:hover {
      background: rgba(255,255,255,0.2);
      border-color: rgba(255,255,255,0.5);
      transform: translateY(-2px);
    }

    /* Contenido principal */
    main {
      flex: 1;
      padding: 100px 20px 40px;
      display: flex;
      flex-direction: column;
      align-items: center;
    }

    /* Título mejorado */
    .page-title {
      text-align: center;
      margin-bottom: 50px;
    }

    .page-title h1 {
      font-size: clamp(2.5rem, 6vw, 4rem);
      text-transform: uppercase;
      letter-spacing: 3px;
      margin-bottom: 15px;
      text-shadow: 2px 2px 8px rgba(0,0,0,0.7);
      background: linear-gradient(45deg, #1e4f9f, #fff);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    .page-title p {
      font-size: 1.2rem;
      opacity: 0.9;
      max-width: 600px;
      margin: 0 auto;
    }

    /* Grid del abecedario mejorado */
    .alphabet-container {
      width: 100%;
      max-width: 1200px;
      margin: 0 auto;
      background: rgba(255,255,255,0.05);
      backdrop-filter: blur(15px);
      border: 1px solid rgba(255,255,255,0.1);
      border-radius: 25px;
      padding: 40px;
      box-shadow: 0 20px 40px rgba(0,0,0,0.3);
    }

    .alphabet-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
      gap: 20px;
      justify-items: center;
    }

    .letter-card {
      background: rgba(255,255,255,0.1);
      backdrop-filter: blur(10px);
      border: 1px solid rgba(255,255,255,0.2);
      border-radius: 20px;
      padding: 20px;
      width: 100%;
      max-width: 140px;
      text-align: center;
      cursor: pointer;
      transition: all 0.3s ease;
      box-shadow: 0 8px 25px rgba(0,0,0,0.2);
    }

    .letter-card:hover {
      transform: translateY(-10px) scale(1.05);
      background: rgba(255,255,255,0.15);
      border-color: rgba(30, 79, 159, 0.5);
      box-shadow: 0 15px 35px rgba(0,0,0,0.3);
    }

    .letter-card img {
      width: 80px;
      height: 80px;
      object-fit: cover;
      border-radius: 50%;
      border: 3px solid rgba(255,255,255,0.3);
      margin-bottom: 15px;
      transition: all 0.3s ease;
    }

    .letter-card:hover img {
      border-color: #1e4f9f;
      transform: rotate(10deg);
    }

    .letter-card p {
      font-size: 1.5rem;
      font-weight: 700;
      margin: 0;
      color: #fff;
      text-shadow: 1px 1px 3px rgba(0,0,0,0.5);
    }

    /* Modal mejorado */
    .modal {
      display: none;
      position: fixed;
      z-index: 2000;
      left: 0;
      top: 0;
      width: 100%;
      height: 100%;
      background: rgba(0,0,0,0.8);
      backdrop-filter: blur(10px);
      justify-content: center;
      align-items: center;
      animation: fadeIn 0.3s ease;
    }

    @keyframes fadeIn {
      from { opacity: 0; }
      to { opacity: 1; }
    }

    .modal-content {
      background: rgba(0,0,0,0.9);
      backdrop-filter: blur(20px);
      border: 1px solid rgba(255,255,255,0.2);
      border-radius: 25px;
      padding: 40px;
      width: 90%;
      max-width: 500px;
      text-align: center;
      color: #fff;
      position: relative;
      box-shadow: 0 25px 50px rgba(0,0,0,0.5);
      animation: slideIn 0.3s ease;
    }

    @keyframes slideIn {
      from { 
        transform: translateY(-50px);
        opacity: 0;
      }
      to { 
        transform: translateY(0);
        opacity: 1;
      }
    }

    .modal-content img {
      width: 100%;
      max-width: 300px;
      height: 300px;
      object-fit: contain;
      border-radius: 20px;
      margin-bottom: 20px;
      border: 2px solid rgba(255,255,255,0.2);
      background: rgba(255,255,255,0.05);
    }

    .modal-content h3 {
      font-size: 2rem;
      margin-bottom: 10px;
      color: #1e4f9f;
    }

    .modal-content p {
      font-size: 1.1rem;
      opacity: 0.9;
      margin-bottom: 20px;
    }

    .close {
      position: absolute;
      top: 15px;
      right: 20px;
      font-size: 35px;
      cursor: pointer;
      color: rgba(255,255,255,0.7);
      transition: all 0.3s ease;
      width: 40px;
      height: 40px;
      display: flex;
      align-items: center;
      justify-content: center;
      border-radius: 50%;
    }

    .close:hover {
      color: #ff4757;
      background: rgba(255,255,255,0.1);
      transform: rotate(90deg);
    }

    /* Footer idéntico al inicio.php */
    footer {
      background: rgba(0,0,0,0.8);
      backdrop-filter: blur(10px);
      border-top: 1px solid rgba(255,255,255,0.1);
      padding: 30px 20px;
      margin-top: auto;
    }

    .footer-content {
      display: flex;
      justify-content: space-between;
      align-items: center;
      max-width: 1200px;
      margin: 0 auto;
      flex-wrap: wrap;
      gap: 20px;
    }

    .logo-footer {
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .logo-footer img {
      width: 50px;
      height: 50px;
      border-radius: 50%;
    }

    .logo-footer span {
      font-weight: 600;
      font-size: 1.2rem;
      color: #fff;
    }

    .footer-links {
      display: flex;
      gap: 30px;
      flex-wrap: wrap;
    }

    .footer-links a {
      text-decoration: none;
      color: #fff;
      transition: all 0.3s ease;
      font-weight: 500;
    }

    .footer-links a:hover {
      color: #1e4f9f;
    }

    .copyright {
      text-align: center;
      margin-top: 20px;
      padding-top: 20px;
      border-top: 1px solid rgba(255,255,255,0.1);
      color: rgba(255,255,255,0.7);
      font-size: 0.9rem;
    }

    /* Responsive Design */
    @media (max-width: 768px) {
      .nav-logo span {
        display: none;
      }

      .alphabet-container {
        padding: 25px;
        margin: 0 10px;
      }

      .alphabet-grid {
        grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
        gap: 15px;
      }

      .letter-card {
        padding: 15px;
        max-width: 120px;
      }

      .letter-card img {
        width: 60px;
        height: 60px;
      }

      .letter-card p {
        font-size: 1.3rem;
      }

      .modal-content {
        padding: 25px;
        margin: 20px;
      }

      .modal-content img {
        max-width: 250px;
        height: 250px;
      }

      .footer-content {
        flex-direction: column;
        text-align: center;
      }

      .footer-links {
        justify-content: center;
      }
    }

    @media (max-width: 480px) {
      .alphabet-grid {
        grid-template-columns: repeat(auto-fit, minmax(80px, 1fr));
        gap: 10px;
      }

      .letter-card {
        padding: 10px;
        max-width: 100px;
      }

      .letter-card img {
        width: 50px;
        height: 50px;
      }

      .letter-card p {
        font-size: 1.1rem;
      }
    }

    /* Scrollbar personalizada */
    ::-webkit-scrollbar {
      width: 8px;
    }

    ::-webkit-scrollbar-track {
      background: rgba(0,0,0,0.1);
    }

    ::-webkit-scrollbar-thumb {
      background: rgba(30, 79, 159, 0.8);
      border-radius: 4px;
    }

    ::-webkit-scrollbar-thumb:hover {
      background: rgba(30, 79, 159, 1);
    }


    .hero-title {
      font-size: clamp(3rem, 8vw, 8rem);

      letter-spacing: 2px;
      margin-bottom: 20px;
      transition: 0.5s;
      font-weight: 700;
    }
    .hero-title .blue { 
      color:rgb(90, 153, 255); 
    }
        nav {
      position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
      background: rgba(0,0,0,0.2); backdrop-filter: blur(10px);
      border-bottom: 1px solid rgba(255,255,255,0.1);
      padding: 15px 20px;
      display: flex; justify-content: space-between; align-items: center;
      transition: all 0.3s ease;
    }

    .nav-logo { display: flex; align-items: center; gap: 10px; }
    .nav-logo img { width: 50px; height: 50px; border-radius: 50%; }
    .nav-logo span { font-weight: 600; font-size: 1.2rem; display: none; }

    nav ul { list-style: none; display: flex; gap: 30px; margin: 0; }
    nav ul li a {
      color: #fff; text-decoration: none; font-size: 1rem; font-weight: 500;
      transition: all 0.3s ease; padding: 8px 16px; border-radius: 20px;
    }
    nav ul li a:hover { background: rgba(30, 79, 159, 0.3); color: #fff; }

    .menu-toggle { display: none; flex-direction: column; cursor: pointer; padding: 5px; }
    .menu-toggle span { width: 25px; height: 3px; background: #fff; margin: 3px 0; transition: 0.3s; border-radius: 2px; }