/* ══════════════════════════════════════════════
   CATEGORÍAS — Rediseño
   Estética: Editorial tech / dark-accent con tarjetas glassmorphism
   ══════════════════════════════════════════════ */

/* ── Hero de categorías ── */
.categories-section {
    display: flex;
    flex-direction: column;
    background-color: var(--color-primary);
    background-image:
        radial-gradient(ellipse 80% 50% at 50% -10%, rgba(78,155,255,0.18) 0%, transparent 70%),
        linear-gradient(160deg, #021f40 0%, #043873 60%, #042f5e 100%);
    padding: 70px 50px 60px;
    position: relative;
    overflow: hidden;
}

/* Línea decorativa animada de fondo */
.categories-section::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(78,155,255,0.05) 1px, transparent 1px),
        linear-gradient(90deg, rgba(78,155,255,0.05) 1px, transparent 1px);
    background-size: 48px 48px;
    pointer-events: none;
}

/* Orbe de luz superior */
.categories-section::after {
    content: '';
    position: absolute;
    top: -120px;
    left: 50%;
    transform: translateX(-50%);
    width: 600px;
    height: 300px;
    background: radial-gradient(ellipse, rgba(78,155,255,0.15) 0%, transparent 70%);
    pointer-events: none;
}

/* ── Título ── */
.categories-title {
    text-align: center;
    position: relative;
    z-index: 1;
    margin-bottom: 10px;
}

.categories-title h1 {
    font-family: 'Space Mono', monospace;
    font-size: clamp(28px, 4vw, 44px);
    font-weight: 700;
    color: #ffffff;
    letter-spacing: -1px;
    line-height: 1.1;
}

.categories-title h1::after {
    content: '';
    display: block;
    width: 48px;
    height: 3px;
    background: var(--color-accent);
    margin: 14px auto 0;
    border-radius: 2px;
}

/* Subtítulo descriptivo (opcional, se añade via HTML) */
.categories-subtitle {
    text-align: center;
    color: rgba(255,255,255,0.45);
    font-size: 15px;
    margin-top: 10px;
    margin-bottom: 0;
    position: relative;
    z-index: 1;
    letter-spacing: 0.3px;
}

/* ── Grid de botones ── */
.categories-container {
    padding: 48px 40px 20px;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
    position: relative;
    z-index: 1;
    max-width: 1100px;
    margin: 0 auto;
    width: 100%;
}

/* ── Botón de categoría ── */
.category-button {
    position: relative;
    width: 100%;
    height: 72px;
    background: rgba(255,255,255,0.04);
    border: 1px solid rgba(78,155,255,0.2);
    border-radius: 12px;
    color: rgba(255,255,255,0.85);
    padding: 0 24px;
    text-align: left;
    font-family: 'DM Sans', sans-serif;
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    transition: background 0.25s, border-color 0.25s, color 0.25s, transform 0.2s, box-shadow 0.25s;
    overflow: hidden;
    display: flex;
    align-items: center;
    gap: 14px;
    letter-spacing: 0.1px;
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
}

/* Ícono decorativo número */
.category-button::before {
    content: attr(data-index);
    font-family: 'Space Mono', monospace;
    font-size: 11px;
    color: var(--color-accent);
    opacity: 0.6;
    min-width: 20px;
    letter-spacing: 1px;
}

/* Flecha derecha */
.category-button::after {
    content: '→';
    position: absolute;
    right: 20px;
    font-size: 16px;
    color: var(--color-accent);
    opacity: 0;
    transform: translateX(-6px);
    transition: opacity 0.25s, transform 0.25s;
}

.category-button:hover {
    background: rgba(78,155,255,0.12);
    border-color: rgba(78,155,255,0.55);
    color: #fff;
    transform: translateY(-2px);
    box-shadow: 0 8px 28px rgba(4,56,115,0.4), 0 0 0 1px rgba(78,155,255,0.15);
}

.category-button:hover::after {
    opacity: 1;
    transform: translateX(0);
}

.category-button:active {
    transform: translateY(0);
    background: rgba(78,155,255,0.08);
}

/* Estado activo/seleccionado */
.category-button.active {
    background: rgba(78,155,255,0.18);
    border-color: var(--color-accent);
    color: #fff;
    box-shadow: 0 0 0 3px rgba(78,155,255,0.12);
}

.category-button.active::after {
    opacity: 1;
    transform: translateX(0);
}

/* ══════════════════════════════════════════════
   SECCIÓN DE RESULTADOS
   ══════════════════════════════════════════════ */

.hidden { display: none; }

.articles-result {
    padding: 60px 50px 80px;
    background-color: var(--color-background);
    color: var(--color-text-secondary);
    transition: opacity 0.35s ease;
}

/* Cabecera de resultados */
.articles-result-header {
    text-align: center;
    margin-bottom: 40px;
}

.articles-result h2 {
    font-family: 'Space Mono', monospace;
    font-size: clamp(22px, 3vw, 34px);
    font-weight: 700;
    color: var(--color-primary);
    letter-spacing: -0.5px;
    position: relative;
    display: inline-block;
}

.articles-result h2::after {
    content: '';
    display: block;
    width: 36px;
    height: 3px;
    background: var(--color-accent);
    margin: 12px auto 0;
    border-radius: 2px;
}

/* Contador de artículos */
.articles-count {
    font-size: 13px;
    color: rgba(26,26,46,0.4);
    margin-top: 8px;
    font-family: 'Space Mono', monospace;
    letter-spacing: 1px;
}

/* ── Grid de artículos ── */
.articles-list {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    padding: 0 40px;
    max-width: 1200px;
    margin: 0 auto;
}

/* ── Tarjeta de artículo ── */
.article-card {
    background: #ffffff;
    border-radius: 14px;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    cursor: pointer;
    border: 1px solid rgba(4,56,115,0.08);
    transition: transform 0.25s, box-shadow 0.25s, border-color 0.25s;
    box-shadow: 0 2px 12px rgba(4,56,115,0.06);
    text-decoration: none; /* ← añade esta línea */
}

.article-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 40px rgba(4,56,115,0.14);
    border-color: rgba(78,155,255,0.3);
}

/* Imagen con overlay */
.article-card-image-wrapper {
    position: relative;
    overflow: hidden;
    height: 170px;
    flex-shrink: 0;
}

.article-card img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    transition: transform 0.4s ease;
}

.article-card:hover img {
    transform: scale(1.04);
}

/* Overlay de color al hacer hover en imagen */
.article-card-image-wrapper::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(to bottom, transparent 50%, rgba(4,56,115,0.25) 100%);
    opacity: 0;
    transition: opacity 0.3s;
}

.article-card:hover .article-card-image-wrapper::after {
    opacity: 1;
}

/* Cuerpo de la tarjeta */
.article-card-body {
    padding: 20px 20px 22px;
    display: flex;
    flex-direction: column;
    gap: 8px;
    flex: 1;
}

.article-card h3 {
    font-size: 16px;
    font-weight: 600;
    color: var(--color-primary);
    margin: 0;
    line-height: 1.4;
    letter-spacing: -0.2px;
}

.article-card p {
    font-size: 13.5px;
    color: rgba(26,26,46,0.55);
    margin: 0;
    line-height: 1.6;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* Leer más */
.article-card-link {
    margin-top: 12px;
    font-size: 12.5px;
    font-family: 'Space Mono', monospace;
    color: var(--color-accent);
    letter-spacing: 0.5px;
    display: flex;
    align-items: center;
    gap: 5px;
    opacity: 0;
    transform: translateY(4px);
    transition: opacity 0.2s, transform 0.2s;
}

.article-card:hover .article-card-link {
    opacity: 1;
    transform: translateY(0);
}

/* ── Estado vacío / error / cargando ── */
.no-articles {
    grid-column: 1 / -1;
    text-align: center;
    padding: 60px 20px;
    color: rgba(26,26,46,0.35);
    font-size: 15px;
    font-family: 'Space Mono', monospace;
    letter-spacing: 0.5px;
}

/* Skeleton loader */
.skeleton-card {
    background: #fff;
    border-radius: 14px;
    overflow: hidden;
    border: 1px solid rgba(4,56,115,0.06);
}

.skeleton-img {
    height: 170px;
    background: linear-gradient(90deg, #eef2f8 25%, #e2e8f4 50%, #eef2f8 75%);
    background-size: 200% 100%;
    animation: shimmer 1.4s infinite;
}

.skeleton-body { padding: 20px; display: flex; flex-direction: column; gap: 10px; }

.skeleton-line {
    height: 14px;
    border-radius: 6px;
    background: linear-gradient(90deg, #eef2f8 25%, #e2e8f4 50%, #eef2f8 75%);
    background-size: 200% 100%;
    animation: shimmer 1.4s infinite;
}

.skeleton-line.short { width: 60%; }
.skeleton-line.medium { width: 80%; }

@keyframes shimmer {
    0%   { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

/* ══════════════════════════════════════════════
   RESPONSIVE
   ══════════════════════════════════════════════ */

@media (max-width: 900px) {
    .categories-container { grid-template-columns: repeat(2, 1fr); padding: 36px 20px 16px; }
    .articles-list { grid-template-columns: repeat(2, 1fr); padding: 0 20px; }
    .categories-section { padding: 50px 24px 40px; }
    .articles-result { padding: 40px 24px 60px; }
}

@media (max-width: 580px) {
    .categories-container { 
        grid-template-columns: 1fr;
        padding: 28px 16px 16px;  /* ← simétrico */
    }
    .articles-list { 
        grid-template-columns: 1fr;
        padding: 0 16px;  /* ← simétrico */
    }
    .categories-section {
        padding: 40px 16px 32px;  /* ← simétrico */
    }
    .articles-result {
        padding: 32px 16px 48px;  /* ← simétrico */
    }
}