/* ============================
   ESTILO GENERAL DEL CAMPUS
============================ */

body {
    margin: 0;
    padding: 0;
    background: #ffffff;
    font-family: Arial, sans-serif;
    color: #333;
}


/* ============================
   CABECERA
============================ */

.cabecera {
    background: #002752;
    padding: 18px 0;
    color: white;
    box-shadow: 0px 3px 10px rgba(0,0,0,0.25);
}

.cabecera-contenido {
    width: 92%;
    margin: auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo-cabecera {
    height: 65px;
}

.cabecera-user a {
    color: #ffd700;
    text-decoration: none;
    font-weight: bold;
}


/* ============================
   PIE DE PÁGINA
============================ */

.pie {
    background: #002752;
    color: white;
    text-align: center;
    padding: 18px 0;
    margin-top: 60px;
    font-size: 15px;
}

.pie a {
    color: #ffd700;
    text-decoration: none;
}


/* ============================
   PANEL ALUMNO — TARJETAS PREMIUM
============================ */

.grid-tarjetas {
    max-width: 1100px;
    margin: 60px auto 80px auto;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 45px;
}

.tarjeta-premium {
    background: #ffffff;
    border: 2px solid #003366; /* borde azul premium */
    border-radius: 32px;
    padding: 40px 35px;
    text-align: center;
    box-shadow: 0px 12px 40px rgba(0,0,0,0.18); /* sombra flotante */
    transition: 0.3s;
}

.tarjeta-premium:hover {
    transform: translateY(-7px);
    box-shadow: 0px 15px 50px rgba(0,0,0,0.28);
}

.tarjeta-premium img {
    width: 90px;
    margin-bottom: 22px;
}

.tarjeta-premium h3 {
    margin: 0;
    font-size: 24px;
    color: #002752;
}

.tarjeta-premium p {
    font-size: 16px;
    margin: 18px 0 28px 0;
    color: #444;
}

.btn {
    display: inline-block;
    background: #002752;
    color: white !important;
    padding: 12px 32px;
    font-size: 16px;
    border-radius: 12px;
    text-decoration: none;
    transition: 0.3s;
}

.btn:hover {
    background: #001d3e;
}


/* ============================
   CUADROS PARA LAS INTROS
============================ */

.contenedor-intro {
    max-width: 830px;
    background: rgba(255, 255, 255, 0.88); /* trasparente tostado */
    padding: 55px 60px;
    margin: 60px auto;
    border-radius: 30px;
    box-shadow: 0px 12px 45px rgba(0,0,0,0.28);
}

.contenedor-intro h1 {
    text-align: center;
    color: #002752;
    font-size: 34px;
    margin-bottom: 25px;
}

.contenedor-intro p {
    font-size: 18px;
    line-height: 1.55;
    text-align: justify;
}


/* ============================
   LOGIN PREMIUM
============================ */

.login-box {
    max-width: 480px;
    margin: 60px auto;
    padding: 40px 50px;
    background: rgba(255,255,255,0.95);
    border-radius: 28px;
    box-shadow: 0px 12px 45px rgba(0,0,0,0.25);
    text-align: center;
}

.login-box h2 {
    color: #002752;
    margin-bottom: 25px;
}

.login-box input {
    width: 90%;
    padding: 12px;
    margin: 12px 0;
    border: 2px solid #003366;
    border-radius: 10px;
    font-size: 16px;
}

.login-box input:focus {
    outline: none;
    border-color: #001d3e;
}

.login-box .btn {
    width: 100%;
    margin-top: 15px;
}


/* ============================
   UTILIDADES
============================ */

.center {
    text-align: center;
}