* {
    box-sizing: border-box;
}

body {
    font-family: Arial, Helvetica, sans-serif;
    margin: 0;
    background: #f5f7fb;
    color: #1f2937;
}

.container {
    width: min(900px, 92%);
    margin: 36px auto;
    background: #fff;
    padding: 28px;
    border-radius: 14px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, .08);
}

h1 {
    margin-top: 0;
    color: #1d4ed8;
}

h2 {
    color: #334155;
}

form {
    display: grid;
    gap: 14px;
    margin: 20px 0;
}

label {
    font-weight: 700;
}

input,
select,
textarea {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid #cbd5e1;
    border-radius: 8px;
}

button {
    width: fit-content;
    padding: 10px 18px;
    border: 0;
    border-radius: 8px;
    background: #1d4ed8;
    color: white;
    cursor: pointer;
}

button:hover {
    background: #1e40af;
}

.resultado {
    margin-top: 18px;
    padding: 16px;
    border-left: 4px solid #1d4ed8;
    background: #eff6ff;
    border-radius: 8px;
}

.error {
    color: #b91c1c;
    font-weight: 700;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 18px;
}

th,
td {
    border: 1px solid #dbe3ef;
    padding: 10px;
    text-align: left;
}

th {
    background: #e8eef8;
}

small {
    color: #64748b;
}

code {
    background: #eef2ff;
    padding: 2px 5px;
    border-radius: 4px;
}

ul {
    line-height: 1.7;
}