:root {
    /* Colores principales */
    --white: #ffffff;
    --black: #0a0a0a;
    --green: #0abfa0;
    --green-mas-c-2: #c2f2e9;
    --green-mas-c: #8be8d6;
    --green-c: hsl(170, 73%, 60%);
    --green-o: #008c71;
    --green-mas-o: #006652;
    
    /* Grises */
    --dark-gray: #1a1a1a;
    --medium-gray: #2a2a2a;
    --light-gray: #f8f9fa;
    
    /* Texto */
    --text-primary: #1a1a1a;
    --text-secondary: #334155;
    --text-muted: #64748b;
    
    /* Tipografía */
    --font-primary: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --font-heading: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    
    /* Layout */
    --container-max-width: 1200px;
    --section-padding: 5rem 0;
    --border-radius: 8px;
    --border-radius-lg: 12px;
    --border-radius-xl: 16px;
    
    /* Sombras */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.15);
    --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.2);
    
    /* Transiciones */
    --transition-fast: 0.15s ease-in-out;
    --transition-normal: 0.25s ease-in-out;
    --transition-slow: 0.4s ease-in-out;
  }

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

  body {
    font-family: var(--font-primary);
    background-color: var(--white);
    color: var(--text-primary);
    line-height: 1.5;
  }

  .container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 40px 20px;
  }

  .header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--green-mas-c-2);
    z-index: 1000;
    padding: 1rem 0;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-normal);
  }

  .header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 2rem;
    max-width: var(--container-max-width);
    margin: 0 auto;
  }

  .logo {
    height: 45px;
    width: auto;
  }

  .logo img {
    height: 45px;
    width: auto;
  }

  .title {
    text-align: right;
    max-width: 400px;
  }

  .title-subtitle {
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-muted);
    margin-bottom: 4px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
  }

  .title-main {
    font-size: 2.2rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    color: var(--text-primary);
    line-height: 1.15;
    margin: 0;
  }

  .main-content {
    margin-top: 80px;
    padding: var(--section-padding);
  }

  .hero-section {
    display: flex;
    gap: 60px;
    margin-bottom: 60px;
    align-items: flex-start;
    background: linear-gradient(135deg, var(--light-gray) 0%, var(--green-mas-c-2) 100%);
    padding: 3rem 2rem;
    border-radius: var(--border-radius-xl);
    box-shadow: var(--shadow-lg);
  }

  .info-column {
    background: var(--white);
    padding: 2rem;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
  }

  .topics-section {
    background: var(--white);
    padding: 3rem 2rem;
    border-radius: var(--border-radius-xl);
    box-shadow: var(--shadow-md);
    margin-bottom: 4rem;
  }

  .speaker-section {
    background: var(--white);
    padding: 2rem;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
    border-left: 4px solid var(--green);
  }

  .video-container {
    flex: 1;
  }

  .video-placeholder {
    width: 100%;
    aspect-ratio: 16/9;
    background-color: var(--light-gray);
    border: 2px solid var(--green-mas-c-2);
    border-radius: var(--border-radius-xl);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    max-width: 600px;
  }

  .play-icon {
    width: 0;
    height: 0;
    border-left: 30px solid var(--green);
    border-top: 18px solid transparent;
    border-bottom: 18px solid transparent;
    margin-left: 8px;
  }

  .info-column {
    flex: 0 0 300px;
    padding-top: 20px;
  }

  .meta {
    display: grid;
    gap: 12px;
    margin-bottom: 20px;
  }

  .meta-row {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 12px;
    border: 1px solid var(--green-mas-c-2);
    border-radius: 10px;
    background: var(--light-gray);
  }

  .meta-row i {
    color: var(--green-o);
    width: 18px;
    text-align: center;
    flex-shrink: 0;
  }

  .meta-label {
    font-size: 0.9rem;
    color: var(--text-muted);
    line-height: 1.2;
  }

  .meta-value {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    line-height: 1.2;
  }

  .platform {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 30px;
    padding: 12px 16px;
    background: var(--green-mas-c-2);
    border-radius: var(--border-radius);
    border: 2px solid var(--green);
  }

  .zoom-icon {
    width: 32px;
    height: 32px;
    background: #2D8CFF;
    border: 3px solid white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
  }

  .zoom-icon i {
    font-size: 16px;
    color: white;
  }

  .platform span {
    font-size: 1.1rem;
    color: var(--green-o);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
  }

  .cta-button {
    background-color: var(--green);
    color: var(--white);
    border: none;
    padding: 16px 32px;
    border-radius: var(--border-radius-lg);
    font-size: 1.1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-normal);
    width: 100%;
    box-shadow: var(--shadow-sm);
  }

  .cta-button:hover {
    background-color: var(--green-o);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
  }

  .cta-button:focus-visible {
    outline: 3px solid var(--green-c);
    outline-offset: 2px;
  }

  .description {
    text-align: center;
    font-size: 1.3rem;
    color: var(--text-secondary);
    margin-bottom: 60px;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
  }

  .divider {
    height: 1px;
    background-color: var(--green-mas-c-2);
    margin: 40px 0;
  }

  .topics-section {
    margin-bottom: 60px;
  }

  .topics-title {
    font-size: 1.8rem;
    font-weight: 800;
    letter-spacing: -0.01em;
    color: var(--text-primary);
    text-align: center;
    margin-bottom: 30px;
  }

  .topics-list {
    list-style: none;
    padding: 0;
    max-width: 800px;
    margin: 0 auto;
  }

  .topics-list li {
    position: relative;
    padding-left: 20px;
    margin-bottom: 12px;
    font-size: 1.1rem;
    color: var(--text-secondary);
  }

  .topics-list li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 0.55em;
    width: 8px;
    height: 8px;
    border-radius: 2px;
    background: var(--green);
    box-shadow: 0 0 0 2px var(--green-mas-c-2);
    transform: rotate(45deg);
  }

  .speaker-section {
    display: flex;
    align-items: center;
    gap: 20px;
    margin-top: 40px;
  }

  .speaker-image {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    object-fit: cover;
  }

  .speaker-info {
    flex: 1;
  }

  .speaker-label {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: 8px;
  }

  .speaker-name {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.01em;
    color: var(--text-primary);
  }

  .speaker-title {
    font-size: 1rem;
    color: var(--text-muted);
    margin-top: 4px;
  }

  /* Formulario de inscripción */
  .signup-section {
    background: var(--white);
    padding: 3rem 2rem;
    border-radius: var(--border-radius-xl);
    box-shadow: var(--shadow-md);
    margin-top: 4rem;
  }

  .signup-title {
    font-size: 1.6rem;
    font-weight: 800;
    letter-spacing: -0.01em;
    color: var(--text-primary);
    text-align: center;
    margin-bottom: 1.25rem;
  }

  .signup-subtitle {
    text-align: center;
    color: var(--text-secondary);
    margin-bottom: 2rem;
  }

  .form-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
  }

  .form-grid .full {
    grid-column: 1 / -1;
  }

  .form-field label {
    display: block;
    font-size: 0.95rem;
    color: var(--text-secondary);
    margin-bottom: 6px;
    font-weight: 600;
  }

  .form-field input,
  .form-field select,
  .form-field textarea {
    width: 100%;
    padding: 12px 14px;
    border: 1px solid var(--green-mas-c-2);
    border-radius: 10px;
    background: var(--light-gray);
    color: var(--text-primary);
    outline: none;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast);
  }

  .form-field input:focus-visible,
  .form-field select:focus-visible,
  .form-field textarea:focus-visible {
    border-color: var(--green);
    box-shadow: 0 0 0 3px rgba(11, 191, 160, 0.25);
    background: #fff;
  }

  .form-help {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-top: 6px;
  }

  .privacy-note {
    font-size: 0.85rem;
    color: var(--text-muted);
  }

  .actions {
    margin-top: 10px;
  }

  @media (max-width: 768px) {
    .form-grid {
      grid-template-columns: 1fr;
    }
  }

  @media (max-width: 768px) {
    .header {
      padding: 0.75rem 0;
    }
    
    .header .container {
      flex-direction: column;
      gap: 0.75rem;
      padding: 0 1rem;
    }

    .title {
      text-align: center;
      max-width: none;
    }

    .title-subtitle {
      font-size: 0.9rem;
    }

    .title-main {
      font-size: 1.8rem;
    }

    .hero-section {
      flex-direction: column;
      gap: 30px;
      padding: 2rem 1rem;
    }

    .info-column {
      flex: none;
      text-align: center;
      padding: 1.5rem;
    }

    .platform {
      justify-content: center;
    }

    .topics-section {
      padding: 2rem 1rem;
    }

    .speaker-section {
      padding: 1.5rem;
    }

    .container {
      padding: 20px 15px;
    }

    .main-content {
      margin-top: 120px;
      padding: 2rem 0;
    }
  }