/* Variables de color y fuentes */
  :root {
    --primary-color: #001f3f;
    --secondary-color: #003366;
    --accent-color: #ffd700;
    --light-accent: #c0c0c0;
    --dark-accent: #cd7f32;
    --text-color: #333;
    --light-text: #666;
    --bg-color: #f8f9fa;
    --card-bg: #ffffff;
    --gradient-primary: linear-gradient(135deg, #001f3f 0%, #003366 100%);
    --gradient-accent: linear-gradient(90deg, #ffd700, #c0c0c0, #cd7f32);
    --shadow-light: 0 5px 15px rgba(0, 0, 0, 0.08);
    --shadow-medium: 0 8px 25px rgba(0, 0, 0, 0.12);
    --shadow-hover: 0 12px 30px rgba(0, 0, 0, 0.15);
    --border-radius: 12px;
    --transition: all 0.3s ease;
  }

  /* Reset y estilos base */
  * {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }

  body {
    font-family: 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    overflow-x: hidden;
  }

  /* Header mejorado */
  header {
    background: var(--gradient-primary);
    color: white;
    padding: 3rem 1rem 2rem;
    text-align: center;
    position: relative;
    overflow: hidden;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
  }

  header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-accent);
    z-index: 2;
  }

  /* Efecto de partículas en el header */
  .particles {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    opacity: 0.3;
  }

  .particle {
    position: absolute;
    background-color: rgba(255, 255, 255, 0.6);
    border-radius: 50%;
    animation: float 6s infinite ease-in-out;
  }

  @keyframes float {
    0%, 100% { transform: translateY(0) rotate(0deg); }
    50% { transform: translateY(-20px) rotate(180deg); }
  }

  /* Contenedor del logo */
  .logo-container {
    position: relative;
    margin: 0 auto 1.5rem;
    width: 180px;
    height: 180px;
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1;
  }

  .logo-circle {
    position: absolute;
    width: 100%;
    height: 100%;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.1);
    box-shadow: 0 0 30px rgba(255, 215, 0, 0.3);
    animation: pulse 4s infinite alternate;
  }

  @keyframes pulse {
    0% { transform: scale(0.95); opacity: 0.8; }
    100% { transform: scale(1.05); opacity: 1; }
  }

  .logo-container img{
    max-width: 80%;
    height: auto;
    filter: none;   /* <-- importante */
  }

/* <--
  .logo-container img {
    max-width: 80%;
    height: auto;
    filter: brightness(0) invert(1);
    transition: var(--transition);
    z-index: 2;
    position: relative;
  }
*/
  .logo-container:hover img {
    transform: scale(1.1) rotate(5deg);
  }

  /* Títulos del header */
  .header-title {
    margin-bottom: 0.5rem;
    font-size: 2.5rem;
    letter-spacing: 1px;
    font-weight: 300;
    position: relative;
    z-index: 1;
    text-shadow: 0 2px 5px rgba(0, 0, 0, 0.3);
  }

  .header-subtitle {
    margin: 0;
    font-size: 1.2rem;
    opacity: 0.9;
    font-weight: 300;
    max-width: 700px;
    margin: 0 auto;
    line-height: 1.5;
    position: relative;
    z-index: 1;
  }

  /* Contenido principal */
  main {
    max-width: 1100px;
    margin: 3rem auto;
    padding: 0 1.5rem;
  }

  /* Introducción */
  .intro-section {
    background: var(--card-bg);
    border-radius: var(--border-radius);
    padding: 2.5rem;
    margin-bottom: 3rem;
    box-shadow: var(--shadow-light);
    border-left: 5px solid var(--accent-color);
    position: relative;
    overflow: hidden;
  }

  .intro-section::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -50%;
    width: 100%;
    height: 200%;
    background: radial-gradient(circle, rgba(255, 215, 0, 0.05) 1%, transparent 20%);
    z-index: 0;
  }

  .intro-section h2 {
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    font-size: 1.8rem;
    font-weight: 400;
    position: relative;
    z-index: 1;
  }

  .intro-section p {
    font-size: 1.1rem;
    line-height: 1.7;
    position: relative;
    z-index: 1;
  }

  /* Filtros de categoría */
  .category-filters {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 2rem;
    justify-content: center;
  }

  .filter-btn {
    padding: 0.6rem 1.2rem;
    background: var(--card-bg);
    border: 1px solid #e0e0e0;
    border-radius: 30px;
    font-size: 0.95rem;
    color: var(--light-text);
    cursor: pointer;
    transition: var(--transition);
  }

  .filter-btn:hover {
    background-color: #f0f0f0;
    transform: translateY(-2px);
  }

  .filter-btn.active {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
  }

  /* Lista de artículos - Tarjetas modernas */
  .articles-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
  }

  .article-card {
    background: var(--card-bg);
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow-light);
    transition: var(--transition);
    position: relative;
    height: 100%;
    display: flex;
    flex-direction: column;
  }

  .article-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-hover);
  }

  .article-badge {
    position: absolute;
    top: 15px;
    right: 15px;
    background: var(--accent-color);
    color: var(--primary-color);
    padding: 0.3rem 0.8rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
    z-index: 2;
  }

  .article-content {
    padding: 1.8rem;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
  }

  .article-title {
    color: var(--primary-color);
    margin-bottom: 0.8rem;
    font-size: 1.3rem;
    font-weight: 500;
    line-height: 1.4;
  }

  .article-meta {
    display: flex;
    justify-content: space-between;
    margin-bottom: 1.2rem;
    font-size: 0.85rem;
    color: var(--light-text);
  }

  .article-date {
    display: flex;
    align-items: center;
    gap: 5px;
  }

  .article-date i {
    color: var(--accent-color);
  }

  .article-category {
    background: #f0f2f5;
    padding: 0.2rem 0.6rem;
    border-radius: 12px;
  }

  .article-excerpt {
    margin-bottom: 1.5rem;
    flex-grow: 1;
    color: var(--light-text);
    line-height: 1.5;
  }

  .article-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--secondary-color);
    font-weight: 600;
    text-decoration: none;
    padding: 0.5rem 0;
    transition: var(--transition);
    align-self: flex-start;
  }

  .article-link:hover {
    color: var(--primary-color);
    gap: 12px;
  }

  .article-link i {
    transition: var(--transition);
  }

  /* Footer mejorado */
  footer {
    background: var(--primary-color);
    color: white;
    padding: 3rem 1rem;
    text-align: center;
    position: relative;
    overflow: hidden;
  }

  footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-accent);
  }

  .footer-content {
    max-width: 900px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2rem;
  }

  .footer-logo {
    max-width: 150px;
    /* <--filter: brightness(0) invert(1); */
    opacity: 0.8;

    height: auto;
    filter: none;   /* <-- importante */

  }

  .footer-text {
    max-width: 600px;
    margin: 0 auto;
    font-size: 1rem;
    line-height: 1.6;
    opacity: 0.9;
  }

  .social-links {
    display: flex;
    gap: 1.5rem;
    margin-top: 1rem;
  }

  .social-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    color: white;
    text-decoration: none;
    transition: var(--transition);
  }

  .social-link:hover {
    background: var(--accent-color);
    color: var(--primary-color);
    transform: translateY(-3px);
  }

  .copyright {
    margin-top: 2rem;
    padding-top: 1.5rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    font-size: 0.9rem;
    opacity: 0.7;
    width: 100%;
  }

  /* Responsive */
  @media (max-width: 768px) {
    .header-title {
      font-size: 2rem;
    }

    .header-subtitle {
      font-size: 1rem;
    }

    .logo-container {
      width: 150px;
      height: 150px;
    }

    .articles-container {
      grid-template-columns: 1fr;
    }

    .intro-section {
      padding: 1.8rem;
    }

    main {
      padding: 0 1rem;
    }
  }

  @media (max-width: 480px) {
    .header-title {
      font-size: 1.7rem;
    }

    .category-filters {
      justify-content: flex-start;
      overflow-x: auto;
      padding-bottom: 10px;
    }

    .intro-section h2 {
      font-size: 1.5rem;
    }
  }

  /* Efectos especiales */
  .glow-effect {
    position: absolute;
    width: 100px;
    height: 100px;
    background: radial-gradient(circle, rgba(255, 215, 0, 0.15) 0%, transparent 70%);
    border-radius: 50%;
    z-index: 0;
  }

  /* Estilos para animaciones de entrada */
  .fade-in {
    animation: fadeIn 0.8s ease-out forwards;
  }

  @keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
  }

  .stagger-delay-1 { animation-delay: 0.1s; }
  .stagger-delay-2 { animation-delay: 0.2s; }
  .stagger-delay-3 { animation-delay: 0.3s; }
  .stagger-delay-4 { animation-delay: 0.4s; }

  /* Añade estos estilos a tu CSS existente */

  .format-indicator {
    margin-left: 8px;
    font-size: 0.9em;
    opacity: 0.7;
  }

  .category-count {
    font-size: 0.8em;
    opacity: 0.8;
    margin-left: 4px;
  }

  .article-card[data-category="analisis"] {
    border-top: 3px solid #3498db;
  }

  .article-card[data-category="politica"] {
    border-top: 3px solid #e74c3c;
  }

  .article-card[data-category="ensayo"] {
    border-top: 3px solid #9b59b6;
  }

  .article-card[data-category="reflexion"] {
    border-top: 3px solid #f39c12;
  }

  .article-card[data-category="entrevista"] {
    border-top: 3px solid #2ecc71;
  }

  .article-card[data-category="critica"] {
    border-top: 3px solid #e67e22;
  }

  .article-card[data-category="economia"] {
    border-top: 3px solid #1abc9c;
  }

  .article-card[data-category="cultura"] {
    border-top: 3px solid #d35400;
  }