* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: "Segoe UI", Arial, sans-serif;
    background: #f4f6f8;
    color: #1f2937;
}

/* HEADER INSTITUCIONAL */

.header-institucional {
    background: white;
    border-bottom: 4px solid #003b70;
    padding: 18px 40px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    box-shadow: 0 6px 18px rgba(0, 0, 0, 0.08);
}

.logo {
    width: 90px;
    height: 90px;
    object-fit: contain;
}

.titulo-institucional {
    text-align: center;
}

.titulo-institucional h2 {
    margin: 0;
    color: #003b70;
    font-size: 24px;
}

.titulo-institucional p {
    margin: 6px 0 0;
    color: #475569;
    font-size: 16px;
}

/* CONTENIDO GENERAL */

h1,
h2,
h3,
p {
    text-align: center;
}

h1 {
    color: #003b70;
    margin-top: 36px;
    margin-bottom: 18px;
    font-size: 38px;
}

p {
    font-size: 17px;
}

form {
    max-width: 1150px;
    margin: 30px auto 45px;
    background: white;
    padding: 32px;
    border-radius: 16px;
    box-shadow: 0 8px 22px rgba(0, 0, 0, 0.08);
}

/* GRID DE VIDEOS */

.grid-videos {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 26px;
    margin-top: 28px;
}

.card-video {
    background: #ffffff;
    border: 1px solid #dbe3ec;
    border-radius: 18px;
    padding: 22px;
    margin: 0;
    min-height: 430px;
    display: flex;
    flex-direction: column;
    transition: 0.2s ease;
    cursor: pointer;
}

.card-video:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 18px rgba(0, 0, 0, 0.08);
}

.card-video.seleccionado {
    border: 2px solid #003b70;
    background: #eef6ff;
    box-shadow: 0 8px 20px rgba(0, 59, 112, 0.18);
}

.card-video h3 {
    color: #003b70;
    margin-top: 0;
    font-size: 24px;
}

/* VIDEO YOUTUBE */

.video-contenedor {
    position: relative;
    width: 100%;
    padding-bottom: 56.25%;
    height: 0;
    overflow: hidden;
    border-radius: 14px;
    background: #000;
    margin: 18px 0;
}

.video-contenedor iframe {
    position: absolute;
    width: 100%;
    height: 100%;
    border: 0;
    top: 0;
    left: 0;
}

/* BOTÓN DE SELECCIÓN */

.opcion-voto {
    margin-top: auto;
    padding-top: 18px;
}

.opcion-voto input[type="radio"] {
    display: none;
}

.btn-voto {
    display: block;
    width: 100%;
    padding: 15px 16px;
    text-align: center;
    background: #f1f5f9;
    color: #003b70;
    border: 2px solid #cbd5e1;
    border-radius: 12px;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn-voto:hover {
    background: #dcecff;
    border-color: #003b70;
}

.opcion-voto input[type="radio"]:checked + .btn-voto {
    background: #003b70;
    color: white;
    border-color: #003b70;
    box-shadow: 0 6px 14px rgba(0, 59, 112, 0.25);
}

.opcion-voto input[type="radio"]:checked + .btn-voto::before {
    content: "✓ ";
}
/* BOTÓN FINAL */

.btn-registrar,
button {
    display: block;
    width: 100%;
    margin-top: 28px;
    padding: 15px;
    background: #003b70;
    color: white;
    border: none;
    border-radius: 12px;
    font-size: 17px;
    cursor: pointer;
    font-weight: bold;
}

.btn-registrar:hover,
button:hover {
    background: #005a9c;
}

/* TABLA ADMIN */

table {
    width: 80%;
    max-width: 700px;
    margin: 30px auto;
    border-collapse: collapse;
    background: white;
    box-shadow: 0 8px 22px rgba(0, 0, 0, 0.08);
}

th {
    background: #003b70;
    color: white;
}

th,
td {
    padding: 14px;
    text-align: center;
    border: 1px solid #d1d5db;
}

a {
    display: block;
    text-align: center;
    margin-top: 20px;
    color: #003b70;
    text-decoration: none;
    font-weight: bold;
}

a:hover {
    text-decoration: underline;
}

/* FOOTER INSTITUCIONAL */

.footer-institucional {
    margin-top: 50px;
    padding: 24px 20px;
    background: white;
    border-top: 3px solid #003b70;
    text-align: center;
    box-shadow: 0 -4px 14px rgba(0, 0, 0, 0.05);
}

.logo-130 {
    width: 140px;
    height: auto;
    object-fit: contain;
    margin-bottom: 10px;
}

.footer-institucional p {
    margin: 0;
    color: #475569;
    font-size: 14px;
    line-height: 1.5;
}

/* RESPONSIVE */

@media (max-width: 900px) {
    .grid-videos {
        grid-template-columns: 1fr;
    }

    form {
        max-width: 92%;
        padding: 26px;
    }

    h1 {
        font-size: 32px;
    }

    .card-video {
        min-height: auto;
    }
}

@media (max-width: 600px) {
    .header-institucional {
        flex-direction: column;
        gap: 10px;
        padding: 16px;
    }

    .logo {
        width: 70px;
        height: 70px;
    }

    .titulo-institucional h2 {
        font-size: 18px;
    }

    .titulo-institucional p {
        font-size: 14px;
    }

    h1 {
        font-size: 26px;
        margin-top: 28px;
    }

    h2 {
        font-size: 22px;
    }

    p {
        font-size: 15px;
        padding: 0 12px;
    }

    form {
        margin: 20px auto 35px;
        padding: 20px;
    }

    .card-video {
        padding: 18px;
    }

    .card-video h3 {
        font-size: 21px;
    }

    .btn-voto {
        padding: 13px 14px;
        font-size: 15px;
    }

    .btn-registrar,
    button {
        font-size: 15px;
        padding: 13px;
    }

    table {
        width: 94%;
        font-size: 14px;
    }

    .logo-130 {
        width: 120px;
    }

}

input[type="radio"][name="video"] {
    display: none !important;
}