*, *::before, *::after {
    box-sizing: border-box;
}

body { 
    font-family: Arial, sans-serif; 
    background-color: #f4f4f4; 
    padding: 20px; 
}

h1, h2 { 
    color: #333; 
}

h1 {
    border-bottom: 2px solid #007bff; 
    padding-bottom: 10px;
}

.caja-padre { 
    background: white; 
    padding: 25px; 
    border-radius: 12px; 
    box-shadow: 0px 8px 16px rgba(12, 83, 206, 0.5);
    max-width: 650px; 
    margin: auto; 
    font-size: 16px; 
}

form { 
    background: white; 
    padding: 40px; 
    border-radius: 12px; 
    box-shadow: 0px 8px 16px rgba(12, 83, 206, 0.5);
    max-width: 400px; 
    margin: auto; 
}

table {
    width: 100%;
    border-collapse: collapse; 
}

.estudiantes td, .estudiantes th {
    border: 1px solid #232222; 
    padding: 10px; 
}

.btn-azul { 
    display: inline-block; 
    background: #007bff; 
    color: white; 
    padding: 8px 15px; 
    text-decoration: none; 
    border-radius: 5px; 
    margin-top: 10px;
    border: none; 
    cursor: pointer; 
    font-weight: bold;
}

.btn-azul:hover {
    background: #0056b3; 
}

.seccion { 
    position: relative; 
    background: #ffffff; 
    border: 1px solid #ddd; 
    box-shadow: 0px 8px 16px rgba(12, 83, 206, 0.5);
    padding: 15px; 
    margin-top: 20px; 
    border-radius: 8px;
    text-align: left;
}

.subseccion {
    text-align: center;
}

.dropdown { 
    position: absolute; 
    top: 10px; 
    right: 15px; 
}

.dropbtn { 
    background: none; 
    border: none; 
    font-size: 24px; 
    cursor: pointer; 
    color: #aaa; 
}

.dropdown-content {
    display: none;
    position: absolute;
    right: 0;
    background-color: white;
    min-width: 130px;
    box-shadow: 0px 8px 16px rgba(0,0,0,0.3);
    z-index: 10;
    border-radius: 5px;
}

.dropdown-content a {
    color: #333;
    padding: 10px 15px;
    text-decoration: none;
    display: block;
    font-size: 14px;
}

.dropdown-content a:hover { 
    background-color: #f1f1f1; 
}

.dropdown:hover .dropdown-content { 
    display: block; 
}

input, select, textarea { 
    width: 100%; 
    margin-bottom: 15px; 
    padding: 10px; 
    border: 1px solid #ccc;
    border-radius: 4px;
    box-sizing: border-box;
    font-family: Arial, sans-serif; 
}

textarea {
    height: 80px; 
    resize: vertical; 
}

.login {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    margin-top: 80px;
}

.header-navigation {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    align-items: center;
    width: 100%;
    padding: 10px 20px;
    background-color: #f4f4f4;
    box-sizing: border-box;        
}

.header-navigation h1 {
    text-align: center;
    margin: 0;
    font-size: 20px;
    color: white;
}

.caja-sesion {
    background-color: #ffffff;
    padding: 5px 10px;
    border: 1px solid #ddd;
    border-radius: 5px;
    box-shadow: 0px 4px 8px rgba(0,0,0,0.1);
    transition: background 0.3s;
    justify-self: start;
}

.caja-sesion:hover {
    background-color: #a71d2a;
}

.caja-sesion:hover .btn-logout {
    color: white;
}

.separador-seccion {
    margin: 40px 0;
    border: 0;
    border-top: 1px solid #ddd;
}

.titulo-centrado {
    text-align: center;
    margin-bottom: 20px;
}

.tabla-usuarios {
    width: 100%;
    border-collapse: collapse;
    margin-top: 15px;
    background-color: #ffffff;
}

.tabla-usuarios thead tr {
    background-color: #f2f2f2;
    text-align: center; 
}

.tabla-usuarios th, 
.tabla-usuarios td {
    padding: 10px;
    border-bottom: 1px solid #ddd;
    text-align: center; 
    vertical-align: middle;
}

.usuario-protegido {
    color: #7f8c8d;
    font-size: 14px;
    font-weight: 500;
}

.btn-eliminar-usuario {
    color: #e74c3c;
    text-decoration: none;
    font-weight: bold;
    transition: color 0.2s ease;
}

.btn-eliminar-usuario:hover {
    color: #c0392b;
    text-decoration: underline;
}

.estudiantes { 
    background: white;
    width: 100%;
    max-width: 1050px; 
    margin: 40px auto; 
    padding: 25px;
    border-radius: 12px; 
    box-shadow: 0px 8px 16px rgba(12, 83, 206, 0.5); 
    text-align: center;
    box-sizing: border-box;
}

.tabla-responsiva {
    width: 100%;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    border: 1px solid #ddd;
    border-radius: 8px;
    background-color: #ffffff;
    margin-bottom: 15px;
    box-sizing: border-box;
}

.tabla-responsiva table {
    min-width: 850px;
    width: 100%;
    margin: 0;
}

.no-wrap {
    white-space: nowrap;
}

.form-buscador {
    background: transparent !important;       
    background-color: transparent !important; 
    box-shadow: none !important;              
    border: none !important;                  
    padding: 10px 0 !important;               
    max-width: 100% !important;
    margin: 0 auto 25px auto !important;
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    justify-content: center;
    align-items: center;
}

.form-buscador .grupo-input {
    flex: 1;
    min-width: 260px;
    max-width: 400px;
    margin: 0;
}

.form-buscador input {
    margin-bottom: 0;
    width: 100%;
    box-sizing: border-box;
}

.form-buscador .grupo-botones {
    display: flex;
    gap: 8px;
    justify-content: center;
}

.form-buscador .grupo-botones .btn-azul,
.form-buscador .grupo-botones a {
    margin-top: 0;
    white-space: nowrap;
}

.paginacion-contenedor {
    margin-top: 20px;
    display: flex;
    gap: 6px;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
}

.paginacion-contenedor .btn-azul {
    margin-top: 0;
    padding: 6px 12px;
    text-decoration: none;
    white-space: nowrap;
}

@media (max-width: 768px) {
    .header-navigation {
        display: flex;
        flex-direction: column;
        gap: 10px;
        text-align: center;
        padding: 15px;
    }
    .header-navigation div {
        display: flex;
        flex-wrap: wrap;
        justify-content: center;
        gap: 10px;
        width: 100%;
    }
    .header-navigation .btn-azul {
        width: 100%;
        max-width: 280px;
    }
    .estudiantes {
        margin: 20px auto;
        padding: 15px;
    }
}