/* =========================================
   RESET Y ESTILOS BASE
   Aplicamos box-sizing global y limpiamos
   márgenes/paddings por defecto
========================================= */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: system-ui, -apple-system, 'Segoe UI', sans-serif;
    font-size: 16px;
    line-height: 1.65;
    color: #1e293b;
    background-color: #f1f5f9;
}

/* =========================================
   NAVEGACIÓN — sticky en la parte superior
========================================= */
.site-header {
    background-color: #1e3a5f;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.25);
}

.navbar {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 56px;
}

/* Marca / logo en la barra de navegación */
.nav-brand {
    color: #ffffff;
    font-size: 1.05rem;
    font-weight: 700;
    letter-spacing: 0.4px;
}

/* Lista de enlaces de navegación */
.nav-menu {
    list-style: none;
    display: flex;
    gap: 4px;
}

.nav-menu a {
    color: #cbd5e1;
    text-decoration: none;
    padding: 6px 14px;
    border-radius: 4px;
    font-size: 0.9rem;
    transition: background-color 0.2s ease, color 0.2s ease;
}

/* Efecto hover en los enlaces del menú */
.nav-menu a:hover {
    background-color: rgba(255, 255, 255, 0.12);
    color: #ffffff;
}

/* =========================================
   CONTENEDOR PRINCIPAL
========================================= */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 40px 24px 60px;
}

/* =========================================
   SECCIONES PRINCIPALES
========================================= */
section {
    margin-bottom: 72px;
}

/* Título grande de cada sección (HTML / CSS / Extras) */
.section-title {
    font-size: 1.9rem;
    font-weight: 700;
    color: #1e3a5f;
    border-bottom: 3px solid #0891b2;
    padding-bottom: 8px;
    margin-bottom: 6px;
}

/* Subtítulo descriptivo bajo el título principal */
.section-subtitle {
    color: #64748b;
    font-size: 0.95rem;
    margin-bottom: 28px;
    font-style: italic;
}

/* =========================================
   ARTÍCULOS / CARDS DE CONTENIDO
========================================= */
article {
    background-color: #ffffff;
    border: 1px solid #e2e8f0;
    border-radius: 8px;
    padding: 28px 32px;
    margin-bottom: 20px;
}

/* Encabezado h2 dentro de cada artículo */
article h2 {
    font-size: 1.35rem;
    color: #1e3a5f;
    margin-bottom: 14px;
    padding-bottom: 8px;
    border-bottom: 1px solid #e2e8f0;
}

/* Sub-encabezados h3 dentro de los artículos */
article h3 {
    font-size: 1.05rem;
    color: #0c4a6e;
    margin: 24px 0 10px;
    font-weight: 600;
}

article p {
    margin-bottom: 12px;
    color: #374151;
}

article ul {
    margin: 8px 0 12px 24px;
    color: #374151;
}

article ul li {
    margin-bottom: 5px;
}

/* =========================================
   BLOQUES DE CÓDIGO (pre + code)
========================================= */

/* Bloque de código multilínea — fondo oscuro tipo editor */
pre {
    background-color: #1e293b;
    border-radius: 6px;
    padding: 20px 24px;
    overflow-x: auto;
    margin: 14px 0;
}

pre code {
    color: #e2e8f0;
    font-family: 'Courier New', Courier, monospace;
    font-size: 0.875rem;
    line-height: 1.75;
    background: transparent;
    padding: 0;
}

/* Código en línea dentro del texto */
code {
    font-family: 'Courier New', Courier, monospace;
    font-size: 0.875rem;
    background-color: #f1f5f9;
    color: #0c4a6e;
    padding: 2px 6px;
    border-radius: 4px;
    border: 1px solid #e2e8f0;
}

/* =========================================
   TABLAS
========================================= */

/* Contenedor con scroll horizontal en móvil */
.table-wrapper {
    overflow-x: auto;
    margin: 14px 0;
    border-radius: 6px;
    border: 1px solid #e2e8f0;
}

table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.88rem;
}

/* Encabezado de tabla — fondo azul marino */
thead tr {
    background-color: #1e3a5f;
    color: #ffffff;
}

thead th {
    padding: 11px 16px;
    text-align: left;
    font-weight: 600;
    white-space: nowrap;
    letter-spacing: 0.2px;
}

/* Filas del cuerpo de la tabla */
tbody tr {
    border-bottom: 1px solid #e2e8f0;
    transition: background-color 0.15s ease;
}

/* Filas alternadas — efecto zebra */
tbody tr:nth-child(even) {
    background-color: #f8fafc;
}

/* Efecto hover sobre las filas */
tbody tr:hover {
    background-color: #e0f2fe;
}

tbody td {
    padding: 10px 16px;
    color: #374151;
    vertical-align: top;
}

/* Código dentro de las celdas de tabla */
tbody td code {
    font-size: 0.82rem;
}

/* =========================================
   LINKS Y BADGES EN TABLAS
========================================= */

/* Enlace de video simulado */
.video-link {
    color: #0891b2;
    text-decoration: none;
    font-size: 0.83rem;
    white-space: nowrap;
    font-weight: 500;
}

.video-link:hover {
    text-decoration: underline;
    color: #0e7490;
}

/* Indicador "No disponible" */
.no-video {
    color: #94a3b8;
    font-size: 0.80rem;
    font-style: italic;
}

/* =========================================
   DIAGRAMA VISUAL DE SINTAXIS CSS
========================================= */
.syntax-diagram {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    background-color: #f8fafc;
    border: 1px solid #e2e8f0;
    border-left: 4px solid #0891b2;
    border-radius: 6px;
    padding: 18px 22px;
    margin: 18px 0;
    flex-wrap: wrap;
    font-family: 'Courier New', monospace;
}

/* Parte del selector en el diagrama */
.syntax-part {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
}

/* Etiqueta descriptiva encima del código en el diagrama */
.syntax-label {
    font-size: 0.68rem;
    font-family: system-ui, sans-serif;
    color: #64748b;
    background-color: #e2e8f0;
    padding: 2px 8px;
    border-radius: 3px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Llaves del bloque de declaración */
.syntax-brace {
    font-size: 1.6rem;
    color: #94a3b8;
    line-height: 1;
    padding-top: 22px;
}

.syntax-declarations {
    display: flex;
    flex-direction: column;
    gap: 4px;
    padding-top: 22px;
}

.syntax-decl {
    display: flex;
    gap: 3px;
    align-items: baseline;
}

/* Colores semánticos para cada parte de la declaración */
.syn-selector { color: #0891b2; font-size: 1.1rem; }
.syn-prop     { color: #7c3aed; }
.syn-colon    { color: #64748b; }
.syn-val      { color: #059669; }
.syn-semi     { color: #64748b; }

/* =========================================
   PIE DE PÁGINA
========================================= */
.site-footer {
    background-color: #1e3a5f;
    color: #94a3b8;
    text-align: center;
    padding: 20px 16px;
    font-size: 0.85rem;
}

/* =========================================
   RESPONSIVE — Media Queries
   Adaptaciones para pantallas pequeñas
========================================= */
@media (max-width: 768px) {
    /* Navegación más compacta en móvil */
    .navbar {
        padding: 0 16px;
        flex-wrap: wrap;
        height: auto;
        gap: 8px;
        padding-top: 10px;
        padding-bottom: 10px;
    }

    .nav-brand {
        font-size: 0.95rem;
    }

    .nav-menu a {
        padding: 5px 10px;
        font-size: 0.82rem;
    }

    /* Contenedor principal con menos padding */
    .container {
        padding: 24px 16px 48px;
    }

    /* Títulos de sección más pequeños */
    .section-title {
        font-size: 1.5rem;
    }

    /* Artículos con menos padding */
    article {
        padding: 20px 16px;
    }

    article h2 {
        font-size: 1.15rem;
    }

    /* Diagrama de sintaxis más compacto */
    .syntax-diagram {
        gap: 6px;
        padding: 14px 14px;
        font-size: 0.85rem;
    }

    .syntax-brace {
        font-size: 1.3rem;
        padding-top: 26px;
    }
}