/* ==========================================================================
       VARIABLES Y SISTEMA DE DISEÑO (ESTILO CLÍNICO / SYSTEM FONTS)
       ========================================================================== */
    :root {
      /* Palette */
      --bg-site: #f8fafc;
      --bg-surface: #ffffff;
      --text-primary: #0f172a;
      --text-secondary: #475569;
      --text-muted: #64748b;
      
      --brand-blue: #1e40af;
      --brand-accent: #2563eb;
      --brand-light: #eff6ff;
      --brand-border: #bfdbfe;
      
      --border-subtle: #e2e8f0;
      --radius-lg: 16px;
      --radius-md: 10px;
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.05);
      --shadow-md: 0 4px 20px -2px rgba(0,0,0,0.05);

      /* Escalado Tipográfico Fluido con Clamp */
      --font-base: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);       /* 16px -> 18px */
      --font-logo: clamp(1.2rem, 1.05rem + 0.75vw, 1.5rem);       /* 19.2px -> 24px */
      --font-hero: clamp(1.05rem, 0.95rem + 0.5vw, 1.25rem);      /* 16.8px -> 20px */
      --font-h1: clamp(1.5rem, 1.25rem + 1.25vw, 2.1rem);         /* 24px -> 33.6px */
      --font-h2: clamp(1.25rem, 1.1rem + 0.75vw, 1.6rem);         /* 20px -> 25.6px */
    }

    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    body {
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
      font-size: var(--font-base);
      line-height: 1.7;
      color: var(--text-primary);
      background-color: var(--bg-site);
      -webkit-font-smoothing: antialiased;
    }

    /* Reducción del ancho máximo a 800px para mayor comodidad de lectura */
    .container {
      max-width: 800px;
      margin: 0 auto;
      padding: 0 20px;
    }

    /* ==========================================================================
       HEADER Y CAMINO DEL HÉROE
       ========================================================================== */
    .top-nav {
      background-color: var(--bg-surface);
      border-bottom: 1px solid var(--border-subtle);
      box-shadow: 0 2px 10px rgba(15, 23, 42, 0.03);
    }

    .nav-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      height: 72px;
    }

    .brand-logo {
      display: flex;
      align-items: center;
      gap: 12px;
      text-decoration: none;
    }

    .logo-icon {
      width: 40px;
      height: 40px;
      background: #eff6ff;
      border: 1px solid #bfdbfe;
      border-radius: 10px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: #2563eb;
      transition: all 0.2s ease;
    }

    .brand-logo:hover .logo-icon {
      background: #2563eb;
      color: #ffffff;
      border-color: #2563eb;
    }

    .logo-text {
      font-size: var(--font-logo);
      font-weight: 800;
      color: #0f172a;
      letter-spacing: -0.03em;
    }

    .logo-extension {
      color: #2563eb;
      font-weight: 700;
    }

    .hero-banner {
      background: linear-gradient(180deg, #f1f5f9 0%, var(--bg-site) 100%);
      border-bottom: 1px solid var(--border-subtle);
      padding: 28px 0;
    }

    .hero-description {
      font-size: var(--font-hero);
      color: var(--text-secondary);
      margin: 0;
      line-height: 1.6;
    }

    .hero-description strong {
      color: #0f172a;
    }
	
    .header-btn-cta {
      background-color: var(--brand-accent);
      color: #ffffff !important;
      font-size: 0.85rem;
      font-weight: 700;
      padding: 8px 16px;
      border-radius: 8px;
      transition: background-color 0.2s ease;
      text-decoration: none !important;
    }

    .header-btn-cta:hover {
      background-color: var(--brand-blue);
    }

    /* ==========================================================================
       LAYOUT A UNA SOLA COLUMNA
       ========================================================================== */
    .layout-single {
      margin-top: 32px;
      margin-bottom: 60px;
    }

    .main-content {
      display: flex;
      flex-direction: column;
      gap: 32px;
    }

    .section-title {
      font-size: var(--font-h2);
      font-weight: 700;
      color: var(--text-primary);
      letter-spacing: -0.02em;
      margin-bottom: 16px;
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .section-card h1.section-title {
      font-size: var(--font-h1);
    }

    p {
      color: var(--text-secondary);
      margin-bottom: 16px;
    }

    p:last-child {
      margin-bottom: 0;
    }

    b, strong {
      color: var(--text-primary);
    }

    a {
      color: var(--brand-accent);
      text-decoration: none;
      font-weight: 600;
      transition: border-color 0.2s;
    }

    a:hover {
      text-decoration: underline;
    }

    /* ==========================================================================
       TARJETAS DE INCIDENCIA (EPIDEMIOLOGÍA)
       ========================================================================== */
    .facts-grid {
      display: grid;
      grid-template-columns: 1fr;
      gap: 16px;
      margin-bottom: 8px;
    }

    @media (min-width: 550px) {
      .facts-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    .fact-card {
      background-color: var(--bg-surface);
      border: 1px solid var(--border-subtle);
      border-left: 4px solid var(--brand-accent);
      border-radius: var(--radius-md);
      padding: 18px 20px;
      box-shadow: var(--shadow-sm);
      display: flex;
      align-items: center;
      gap: 16px;
    }

    .fact-number {
      font-size: 1.8rem;
      font-weight: 800;
      color: var(--brand-accent);
      line-height: 1;
    }

    .fact-text {
      font-size: 0.9rem;
      color: var(--text-secondary);
      line-height: 1.4;
    }

    /* ==========================================================================
       HERO TEST WIDGET
       ========================================================================== */
    .test-hero-card {
      background: linear-gradient(180deg, #ffffff 0%, var(--brand-light) 100%);
      border: 1px solid var(--brand-border);
      position: relative;
      border-radius: var(--radius-lg);
      padding: 24px;
    }

    .test-interactive-box {
      background-color: var(--bg-surface);
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-md);
      padding: 24px;
      margin: 20px 0;
      text-align: center;
      box-shadow: var(--shadow-md);
    }

    .ishihara-img-container {
      margin-bottom: 16px;
    }

    .ishihara-img-container img {
      border-radius: 50%;
      box-shadow: 0 4px 12px rgba(0,0,0,0.08);
      border: 4px solid var(--bg-surface);
    }

    .btn-action {
      display: inline-block;
      width: 100%;
      max-width: 320px;
      background-color: var(--brand-accent);
      color: #ffffff !important;
      font-size: 1.05rem;
      font-weight: 700;
      text-align: center;
      padding: 14px 24px;
      border-radius: var(--radius-md);
      box-shadow: 0 4px 12px rgba(37, 99, 235, 0.25);
      transition: all 0.2s ease;
      margin-top: 12px;
    }

    .btn-action:hover {
      background-color: var(--brand-blue);
      transform: translateY(-2px);
      box-shadow: 0 6px 16px rgba(37, 99, 235, 0.35);
      text-decoration: none;
    }

    /* ==========================================================================
       LISTAS Y COMPONENTES DE MEDIOS
       ========================================================================== */
    .type-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 16px;
      margin-top: 12px;
    }

    .type-list li {
      background-color: var(--bg-surface);
      padding: 16px 20px;
      border-radius: var(--radius-md);
      border-left: 3px solid var(--brand-accent);
      border: 1px solid var(--border-subtle);
      border-left-width: 4px;
      border-left-color: var(--brand-accent);
      font-size: 0.95rem;
      color: var(--text-secondary);
    }

    .type-list li b {
      display: block;
      font-size: 1.05rem;
      margin-bottom: 2px;
    }

    .media-figure {
      margin: 24px 0;
    }

    .media-figure img {
      width: 100%;
      height: auto;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-subtle);
      display: block;
    }

    .media-figure figcaption {
      font-size: 0.85rem;
      color: var(--text-muted);
      margin-top: 8px;
      text-align: center;
    }

    /* ==========================================================================
       FUENTES DE REFERENCIA (FINAL DEL CUERPO)
       ========================================================================== */
    .references-section {
      background-color: var(--bg-surface);
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-lg);
      padding: 24px;
      margin-top: 16px;
    }

    .ref-grid {
      display: grid;
      grid-template-columns: 1fr;
      gap: 12px;
      margin-top: 12px;
    }

    @media (min-width: 550px) {
      .ref-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    .ref-link-card {
      font-size: 0.95rem;
      display: flex;
      align-items: center;
      gap: 8px;
      color: var(--text-secondary);
      padding: 12px 16px;
      background-color: var(--bg-site);
      border: 1px solid var(--border-subtle);
      border-radius: 8px;
      transition: all 0.2s;
    }

    .ref-link-card:hover {
      background-color: var(--brand-light);
      border-color: var(--brand-border);
      color: var(--brand-accent);
      text-decoration: none;
    }

    /* ==========================================================================
       FOOTER
       ========================================================================== */
    .site-footer {
      background-color: var(--bg-surface);
      border-top: 1px solid var(--border-subtle);
      padding: 30px 0;
      color: var(--text-muted);
      font-size: 0.85rem;
      text-align: center;
    }