:root {
      --primary: #004f8b;
      --accent: #fbb040;
      --bg: #f8f9fb;
      --text: #1e1e1e;
      --text-muted: #555;
      --radius: 8px;
    }

    body {
      font-family: 'Inter', sans-serif;
      background: var(--bg);
      color: var(--text);
      margin: 0;
      line-height: 1.6;
    }

    header {
      background: var(--primary);
      color: white;
      padding: 3rem 1rem;
      text-align: center;
    }

    header h1 {
      font-size: 2rem;
      margin-bottom: 0.15rem;
    }

    header h2 {
      font-weight: 400;
      font-size: 1.2rem;
      color: #cfe6f9;
    }

    .btn {
      display: inline-block;
      background: var(--accent);
      color: #1e1e1e;
      padding: 1rem 2rem;
      border-radius: var(--radius);
      margin-top: 1rem;
      font-weight: 600;
      text-decoration: none;
    }

    section {
      max-width: 900px;
      margin: auto;
      padding: 2rem 1.5rem;
    }

    section h3 {
      color: var(--primary);
      font-size: 1.8rem;
      margin-bottom: 1rem;
    }

    .grid {
      display: grid;
      gap: 2rem;
    }

    @media (min-width: 768px) {
      .grid-2 {
        grid-template-columns: 1fr 1fr;
      }
    }

    .card {
      background: white;
      border-radius: var(--radius);
      padding: 1.5rem;
      box-shadow: 0 4px 16px rgba(0, 0, 0, 0.06);
    }

    .card h4 {
      color: var(--primary);
      margin-bottom: 0.5rem;
    }

    blockquote {
      border-left: 4px solid var(--accent);
      margin: 2rem 0;
      padding-left: 1rem;
      color: var(--text-muted);
      font-style: italic;
    }

    footer {
      text-align: center;
      padding: 2rem;
      font-size: 0.9rem;
      background: #f1f1f1;
      color: #444;
    }

    header img {
      max-width: 180px;
      height: auto;
      margin: 0 auto 1.5rem;
      display: block;
    }

    .author-profile {
      text-align: center;
      margin-top: 2rem;
    }

    .author-profile img {
      width: 200px;
      height: 200px;
      object-fit: cover;
      border-radius: 50%;
      box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
      margin-bottom: 1rem;
    }

    h3 {
      text-align: center;
    }

    .language-switcher {
      position: fixed;
      top: 1rem;
      right: 1rem;
      z-index: 9999;
    }

    .flag-button {
      background: transparent;
      border: none;
      font-size: 1.4rem;
      cursor: pointer;
    }

    .lang-menu {
      list-style: none;
      margin: 0.5rem 0 0;
      padding: 0.5rem;
      background: white;
      border-radius: 6px;
      box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
      position: absolute;
      right: 0;
      width: 140px;
    }

    .lang-menu li {
      padding: 0.3rem 0;
    }

    .lang-menu a {
      text-decoration: none;
      color: #1e1e1e;
      font-size: 0.95rem;
      display: flex;
      align-items: center;
      gap: 0.5rem;
    }

    .lang-menu img {
      width: 20px;
      height: 14px;
    }

    .hidden {
      display: none;
    }

    .flag-button img {
      width: 24px;
      height: 24px;
      filter: brightness(100%) contrast(140%);
      background: white;
      padding: 4px;
      border-radius: 6px;
      box-shadow: 0 2px 4px rgba(0,0,0,0.15);
    }

    .modal { display: none; position: fixed; z-index: 1000; left: 0; top: 0; width: 100%; height: 100%; background-color: rgba(0,0,0,0.6); justify-content: center; align-items: center; }
    .modal-content { background: white; padding: 2rem; border-radius: 8px; text-align: center; max-width: 400px; width: 90%; }
    .modal input { padding: 0.6rem; width: 100%; margin-top: 1rem; border: 1px solid #ccc; border-radius: 4px; }
    .modal button { margin-top: 1rem; padding: 0.7rem 1.2rem; background: var(--primary, #007BFF); color: white; border: none; border-radius: 4px; cursor: pointer; font-weight: bold; }
    .hidden { display: none; }

    .btn-highlight {
      background-color: #1ec773;
      color: white;
      font-weight: bold;
    }
    .btn-highlight:hover {
      background-color: #17a864;
    }

    .btn-exclusive {
      background-color: #007acc; /* azul vibrante */
      color: white;
      font-weight: bold;
      transition: background-color 0.3s ease;
    }

    .btn-exclusive:hover {
      background-color: #005fa3; /* azul mais escuro */
    }