:root {
    --color-primary: #0a1a2a;
    --color-secondary: #c9a449;
    --color-bg: #f4f4f6;
    --color-text: #222222;
    --color-muted: #6b6b6b;
    --max-width: 1080px;
  }

  * {
    box-sizing: border-box;
  }

  body {
    margin: 0;
    padding: 0;
    font-family: "Montserrat", system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
    color: var(--color-text);
    background-color: #ffffff;
    line-height: 1.6;
  }

  h1, h2, h3, h4 {
    font-family: "Playfair Display", Georgia, "Times New Roman", serif;
    color: var(--color-primary);
    margin-top: 0;
  }

  a {
    color: var(--color-primary);
    text-decoration: none;
  }

  a:hover {
    text-decoration: underline;
  }

  .container {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 1.5rem;
  }

  /* HERO */

  .hero, .hero-minimal {
    background: radial-gradient(circle at top left, #143352, #020910);
    color: #ffffff;
    padding: 4rem 0 3rem;
  }

  .hero h1, .hero-minimal h1 {
    color: #ffffff;
    font-size: 2.4rem;
    margin-bottom: 0.75rem;
  }

  .hero h2, .hero-minimal .subtitle {
    color: #e0e0e0;
    font-weight: 400;
    margin-bottom: 1.5rem;
  }

  .hero p, .hero-minimal p {
    color: #f5f5f5;
    max-width: 720px;
  }

  .hero-cta {
    margin-top: 2rem;
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
  }

  /* BOTONES */

  .btn {
    display: inline-block;
    padding: 0.75rem 1.6rem;
    border-radius: 999px;
    border: 2px solid transparent;
    font-weight: 600;
    font-size: 0.95rem;
    letter-spacing: 0.03em;
    text-transform: uppercase;
    cursor: pointer;
    text-align: center;
    transition: all 0.2s ease-in-out;
  }

  .btn-primary {
    background-color: var(--color-secondary);
    border-color: var(--color-secondary);
    color: #0a1a2a;
  }

  .btn-primary:hover {
    background-color: #b28f3f;
    border-color: #b28f3f;
    text-decoration: none;
  }

  .btn-secondary {
    background-color: transparent;
    border-color: #ffffff;
    color: #ffffff;
  }

  .btn-secondary:hover {
    background-color: #ffffff;
    color: var(--color-primary);
    text-decoration: none;
  }

  /* SECCIONES GENERALES */

  .section {
    padding: 3rem 0;
  }

  .section:nth-of-type(even) {
    background-color: var(--color-bg);
  }

  .section h2 {
    font-size: 1.8rem;
    margin-bottom: 1.25rem;
  }

  .section p {
    margin-bottom: 1rem;
  }

  ul {
    padding-left: 1.2rem;
  }

  /* TARJETAS DE EVENTOS */

  .events .event-card {
    background-color: #ffffff;
    border-radius: 1rem;
    padding: 1.75rem;
    margin-bottom: 1.8rem;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.06);
  }

  .event-card h3 {
    margin-bottom: 0.5rem;
  }

  .event-card h4 {
    margin-top: 0;
    margin-bottom: 0.75rem;
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-muted);
  }

  .event-details {
    list-style: none;
    padding-left: 0;
    margin: 0.75rem 0 1rem;
  }

  .event-details li {
    margin-bottom: 0.25rem;
  }

  .note {
    font-size: 0.9rem;
    color: var(--color-muted);
  }

  /* TIMELINE / AGENDA */

  .timeline {
    list-style: none;
    padding-left: 0;
    border-left: 3px solid rgba(10, 26, 42, 0.16);
    margin-left: 0.6rem;
  }

  .timeline li {
    padding-left: 1rem;
    margin-bottom: 1rem;
    position: relative;
  }

  .timeline li::before {
    content: "";
    position: absolute;
    left: -0.55rem;
    top: 0.4rem;
    width: 0.7rem;
    height: 0.7rem;
    border-radius: 50%;
    background-color: var(--color-secondary);
  }

  /* GRID INSCRIPCIONES */

  .registration-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

  .registration-card {
    background-color: #ffffff;
    border-radius: 1rem;
    padding: 1.5rem;
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.05);
  }

  .registration-card h3 {
    margin-bottom: 0.5rem;
  }

  /* ONE PAGE – TARJETAS / GRID BÁSICO */

  .highlights .grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.3rem;
  }

  .highlights .card {
    background-color: #ffffff;
    border-radius: 1rem;
    padding: 1.4rem;
    box-shadow: 0 6px 18px rgba(0, 0, 0, 0.04);
  }

  .speaker-mini, .agenda-mini, .cta-final {
    text-align: left;
  }

  .cta-final {
    text-align: center;
  }

  .cta-final .hero-cta {
    justify-content: center;
  }

  .contact-mini {
    margin-top: 1rem;
    font-size: 0.95rem;
    color: var(--color-muted);
  }

  /* FOOTER */

  .footer {
    background-color: #020910;
    color: #e5e5e5;
    padding: 2rem 0;
  }

  .footer h2 {
    color: #ffffff;
    margin-bottom: 0.75rem;
  }

  .footer a {
    color: #f0f0f0;
  }

  .footer .legal {
    font-size: 0.85rem;
    color: #aaaaaa;
    margin-top: 1rem;
  }

  /* RESPONSIVE */

  @media (min-width: 768px) {
    .hero, .hero-minimal {
      padding: 5rem 0 4rem;
    }

    .hero h1, .hero-minimal h1 {
      font-size: 2.9rem;
    }

    .events .event-card {
      padding: 2rem;
    }

    .registration-grid {
      grid-template-columns: repeat(3, 1fr);
    }

    .highlights .grid {
      grid-template-columns: repeat(3, 1fr);
    }
  }

  @media (min-width: 1024px) {
    .hero h1, .hero-minimal h1 {
      font-size: 3.1rem;
    }

    .hero p, .hero-minimal p {
      font-size: 1rem;
    }
  }