/* ===== RESET Y VARIABLES ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --color-primario: #2c3e50;
    --color-secundario: #563a3a;
    --color-fondo: #ffffff;
    --color-texto: #1a1a1a;
    --color-exito: #2e7d32;
    --color-advertencia: #b85e00;
}

/* ===== ESTILOS GENERALES ===== */
body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--color-texto);
    background-color: var(--color-fondo);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ===== ENCABEZADO ===== */
header {
    background-color: var(--color-secundario);
    color: white;
    padding: 2rem;
    text-align: center;
}

header h1 {
    font-size: 2.2rem;
    margin-bottom: 0.5rem;
}

/* ===== NAVEGACIÓN ===== */
nav {
    background-color: var(--color-primario);
    padding: 1rem;
}

nav ul {
    list-style: none;
    display: flex;
    justify-content: center;
    gap: 2rem;
    flex-wrap: wrap;
}

/* COLOR CAMBIADO AQUÍ */
nav a {
    color: #0b1011;
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    font-weight: 500;
}

nav a:hover {
    background-color: rgba(255, 255, 255, 0.2);
}

nav a[aria-current="page"] {
    background-color: rgba(255, 255, 255, 0.3);
    font-weight: bold;
}

/* ===== CONTENIDO PRINCIPAL ===== */
main {
    flex: 1;
    max-width: 1200px;
    margin: 2rem auto;
    padding: 0 2rem;
    width: 100%;
}

section {
    margin-bottom: 3rem;
}

section h2 {
    color: var(--color-secundario);
    border-bottom: 3px solid var(--color-secundario);
    padding-bottom: 0.5rem;
    margin-bottom: 2rem;
}

article {
    background-color: #f8f9fa;
    border: 1px solid #dee2e6;
    border-radius: 8px;
    padding: 2rem;
    margin-bottom: 2rem;
}

article h3 {
    color: var(--color-primario);
    margin-bottom: 1.5rem;
}

/* ===== FORMULARIOS ===== */
form {
    max-width: 600px;
    margin: 0 auto;
}

label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
}

input, select, textarea {
    width: 100%;
    padding: 0.75rem;
    margin-bottom: 1.5rem;
    border: 2px solid #ced4da;
    border-radius: 4px;
    font-size: 1rem;
}

input:focus {
    outline: 3px solid #0c0e11;
    border-color: var(--color-primario);
}

fieldset {
    border: 2px solid #ced4da;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    border-radius: 4px;
}

legend {
    font-weight: 600;
    padding: 0 0.5rem;
}

button {
    background-color: var(--color-primario);
    color: white;
    border: none;
    padding: 0.875rem 2rem;
    font-size: 1.1rem;
    border-radius: 4px;
    cursor: pointer;
    font-weight: 600;
    min-width: 200px;
}

button:hover {
    background-color: #1a252f;
}

button:focus {
    outline: 3px solid #050607;
    outline-offset: 2px;
}

/* ===== TABLAS ===== */
table {
    width: 100%;
    border-collapse: collapse;
    margin: 1.5rem 0;
}

caption {
    font-weight: 600;
    margin-bottom: 0.5rem;
    text-align: left;
}

th, td {
    border: 2px solid #dee2e6;
    padding: 1rem;
    text-align: left;
}

th {
    background-color: var(--color-primario);
    color: white;
}

/* ===== LISTAS ===== */
ul {
    list-style: none;
    padding: 0;
}

li {
    background-color: #f8f9fa;
    border: 2px solid #366ca1;
    padding: 1rem;
    margin-bottom: 0.5rem;
    border-radius: 4px;
}

/* ===== ASIDE (NOTAS LATERALES) ===== */
aside {
    background-color: #583a0f;
    border-left: 6px solid var(--color-advertencia);
    padding: 1.5rem;
    margin: 2rem 0;
    border-radius: 0 8px 8px 0;
}

/* ===== PIE DE PÁGINA ===== */
footer {
    background-color: #203b57;
    padding: 2rem;
    text-align: center;
    margin-top: 3rem;
}

footer a {
    color: var(--color-primario);
    text-decoration: none;
    font-weight: 600;
}

footer a:hover {
    text-decoration: underline;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
    nav ul {
        flex-direction: column;
        align-items: center;
        gap: 0.5rem;
    }
    
    header h1 {
        font-size: 1.8rem;
    }
    
    main {
        padding: 0 1rem;
    }
    
    button {
        width: 100%;
    }
}

/* ===== ACCESIBILIDAD ===== */
@media (prefers-reduced-motion: reduce) {
    * {
        animation: none;
        transition: none;
    }
}

/* Clase para elementos ocultos visualmente pero accesibles */
.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0,0,0,0);
    border: 0;
}
.boton {transition: all 0.3s ease; }
.boton:hover { transform: translateY(-2px);}