/* ================================
   ESTILO GENERAL
================================ */
body {
    font-family: "Inter", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background: #0b1220;
    padding: 40px;
    color: #e5e7eb;
    line-height: 1.6;
}

/* ================================
   CENTRAR CONTENIDO ESTILO PUBCHEM
================================ */
main, section, .pagina, .contenido, body > div {
    max-width: 900px;
    margin-left: auto;
    margin-right: auto;
}

/* ================================
   TÍTULOS
================================ */
h1, h2, h3 {
    text-align: center;
    font-weight: 650;
    margin-bottom: 20px;
    color: #f9fafb;
}

/* ================================
   MENÚ PRINCIPAL
================================ */
.menu {
    max-width: 420px;
    margin: 40px auto;
    padding: 24px;
    background: #0f172a;
    border-radius: 12px;
    border: 1px solid #1e3a8a;
}

.menu a {
    display: block;
    padding: 12px;
    margin: 10px 0;
    background: linear-gradient(135deg, #1e3a8a, #1d4ed8);
    color: #ffffff;
    text-decoration: none;
    text-align: center;
    font-weight: 600;
    border-radius: 8px;
}

.menu a:hover {
    background: linear-gradient(135deg, #2563eb, #3b82f6);
}

/* ================================
   FORMULARIOS
================================ */
form {
    max-width: 1000px;
    margin: 40px auto;
    background: #020617;
    padding: 30px;
    border-radius: 12px;
    border: 1px solid #1e3a8a;
}

/* ================================
   FIELDSET
================================ */
fieldset {
    margin-bottom: 25px;
    padding: 20px;
    border-radius: 10px;
    border: 1px solid #1e40af;
    background: #030712;
}

legend {
    padding: 0 10px;
    font-weight: 600;
    color: #60a5fa;
}

/* ================================
   PÁRRAFOS Y LISTAS
================================ */
p, ul, li {
    text-align: left;
    font-size: 15px;
}

/* ================================
   INPUTS GENERALES
================================ */
input {
    padding: 8px 10px;
    margin: 6px;
    border-radius: 6px;
    border: 1px solid #1e3a8a;
    font-size: 14px;
    background: #020617;
    color: #f1f5f9;
}

input:focus {
    outline: none;
    border-color: #60a5fa;
    background: #020617;
}

/* ================================
   BOTONES
================================ */
button {
    padding: 10px 26px;
    background: linear-gradient(135deg, #1e3a8a, #1d4ed8);
    color: #ffffff;
    border: none;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 650;
    cursor: pointer;
}

button:hover {
    background: linear-gradient(135deg, #2563eb, #3b82f6);
}

/* ================================
   TABLA COMPACTA
================================ */
table {
    width: 70%;
    margin: 20px auto;
    border-collapse: collapse;
    background: #020617;
    border: 1px solid #1e3a8a;
}

/* Encabezados */
th {
    background: linear-gradient(135deg, #172554, #1d4ed8);
    color: #ffffff;
    padding: 6px 8px;
    font-size: 14px;
    font-weight: 650;
    border: 1px solid #1e3a8a;
}

/* Celdas */
td {
    padding: 4px 6px;
    text-align: center;
    border: 1px solid #1e293b;
    color: #e5e7eb;
}

tr:nth-child(even) td {
    background: #020617;
}

/* Inputs dentro de la tabla */
table input {
    width: 90px;
    padding: 4px 6px;
    font-size: 13px;
    border-radius: 4px;
    border: 1px solid #1e3a8a;
    background: #020617;
    color: #e5e7eb;
    text-align: center;
}

/* ================================
   CONTENEDOR DE GRÁFICA
================================ */
.grafica-container {
    max-width: 900px;
    margin: 30px auto;
    background: #020617;
    padding: 20px;
    border: 1px solid #1e3a8a;
    border-radius: 10px;
}

/* Gráfica */
.grafica-container iframe,
.grafica-container img {
    width: 100%;
    height: 500px;
    border: 1px solid #1e3a8a;
    border-radius: 6px;
    background: #020617;
}