body {
    margin: 0;
    font-family: 'Roboto', sans-serif;
    background-color: var(--bg);
    color: var(--text);
    transition: background 0.3s, color 0.3s;
}

:root {
    --bg: #f5f5f5;
    --text: #333;
    --primary: #4CAF50;
}

.dark-mode {
    --bg: #1c1c1e;
    --text: #eaeaea;
    --primary: #4CAF50;
}

.container {
    max-width: 600px;
    margin: auto;
    padding: 2rem;
}

h1 {
    text-align: center;
    color: var(--primary);
}

.input-group {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

input {
    width: 80%;
    max-width: 400px;
    padding: 1rem;
    font-size: 1.2rem;
    border: none;
    border-radius: 5px;
}

button {
    width: 60%;
    max-width: 250px;
    background: var(--primary);
    color: white;
    padding: 1rem;
    font-size: 1rem;
    border: none;
    cursor: pointer;
    border-radius: 5px;
}

.result {
    margin-top: 1.5rem;
    font-size: 1.3rem;
    text-align: center;
}

.toggle-mode {
    position: absolute;
    top: 1rem;
    right: 1rem;
    cursor: pointer;
    font-size: 1.2rem;
}

@media (max-width: 600px) {
    .container {
        padding: 1rem;
    }
}

.explicacion {
    max-width: 700px;
    margin: 3rem auto;
    padding: 2rem;
    background-color: rgba(0, 0, 0, 0.03);
    border-radius: 8px;
}

.explicacion h2 {
    color: var(--primary);
    text-align: center;
}

.explicacion h3 {
    color: var(--primary);
    text-align: center;
}

.explicacion summary {
    color: var(--primary);
    text-align: center;
    font-size: large;
}

.explicacion ul {
    padding: 0;
}

.explicacion li {
    margin: 0.5rem 0;
    font-size: 1.1rem;
}

.row {
    display: flex;
    gap: 1vw;
}

.column {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
}

label {
    margin-bottom: 6px;
    font-weight: 600;
}

textarea {
    width: 40vw;
    height: 250px;
    padding: 10px;
    border-radius: 8px;
    border: 1px solid #ccc;
    font-size: 14px;
}

.dark-mode textarea:disabled {
    background-color: var(--bg);
    color: var(--text);
    border-color: #444;
    /* opcional, para que combine mejor */
}

footer {
    text-align: center;
    padding: 2rem;
    font-size: 0.9rem;
    color: var(--text);
    background-color: var(--bg);
    opacity: 0.7;

}