body {
    background: linear-gradient(120deg, #4c7bd1, #4c86e9);
    font-family: Consolas, monospace;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}

.calculadora {
    background: #8df1ec;
    padding: 14px;
    border-radius: 12px;
    width: 380px;
    box-shadow: 0 12px 30px rgba(0,0,0,.4);
}

h2 {
    text-align: center;
    color: #003c3c;
    margin-bottom: 8px;
}

#display {
    width: 100%;
    height: 42px;
    font-size: 18px;
    text-align: right;
    margin-bottom: 8px;
    padding-right: 8px;
    border: #f70d05 2px;
}

.botones {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 6px;
}

button {
    padding: 8px;
    font-size: 13px;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    background: #edf3ec;
}

button:hover {
    background: #9ef0e8;
}

button:active {
    transform: scale(0.96);
}

#resultados {
    margin-top: 10px;
    width: 100%;
    height: 180px;
    resize: none;
    font-size: 12px;
}

.pdf {
    background: #2e7d32;
    color: white;
}
.pdf:hover {
    background: #1b5e20;
}

.encabezado {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 8px;
    border-bottom: 2px solid #113bf5;
    padding-bottom: 6px;
}

.encabezado img {
    width: 55px;
    height: 55px;
}

.encabezado .titulo h1 {
    margin: 0;
    font-size: 18px;
    color: #0551f5;
}

.encabezado .titulo p {
    margin: 0;
    font-size: 12px;
    font-weight: bold;
    color: #0551f5;
}

.encabezado .titulo span {
    font-size: 10px;
    color: #444;
}

.footer {
    margin-top: 12px;
    padding: 10px;
    text-align: center;
    font-size: 12px;
    color: #0a0a0a;
    border-top: 2px solid #f70d05;
}

.footer p {
    margin: 3px 0;
}