* { box-sizing: border-box; }

body {
    margin: 0;
    font-family: Arial, Helvetica, sans-serif;
    background: #f4f4f4;
    color: #222;
}

.encabezado-diarios {
    background: #fff;
    border-bottom: 3px solid #1674d1;
    padding: 20px;
    text-align: center;
}

.encabezado-diarios h1 {
    margin: 15px 0 5px;
    font-size: 30px;
}

.encabezado-diarios p {
    margin: 0;
    font-weight: bold;
}

.volver {
    display: inline-block;
    color: #1674d1;
    text-decoration: none;
    font-weight: bold;
}

.volver:hover { text-decoration: underline; }

.contenedor-diarios {
    width: min(900px, 92%);
    margin: 30px auto;
    min-height: 55vh;
}

.lista-diarios {
    display: grid;
    gap: 15px;
}

.diario {
    background: #fff;
    border: 1px solid #ccc;
    border-left: 5px solid #1674d1;
    padding: 18px 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
    box-shadow: 0 1px 3px rgba(0,0,0,.08);
}

.diario-fecha {
    font-weight: bold;
    font-size: 18px;
}

.boton-descargar {
    display: inline-block;
    background: #1674d1;
    color: white;
    text-decoration: none;
    padding: 10px 16px;
    border-radius: 4px;
    font-weight: bold;
    white-space: nowrap;
}

.boton-descargar:hover { background: #0d5da9; }

.mensaje {
    text-align: center;
    font-weight: bold;
}

footer {
    background: #222;
    color: white;
    padding: 25px 5%;
    display: flex;
    justify-content: space-between;
    gap: 30px;
}

footer div {
    display: flex;
    flex-direction: column;
    gap: 5px;
}

@media (max-width: 600px) {
    .encabezado-diarios h1 { font-size: 24px; }
    .diario { flex-direction: column; align-items: flex-start; }
    .boton-descargar { width: 100%; text-align: center; }
    footer { flex-direction: column; }
}