/* Variáveis do Tema Dark Premium */
    :root {
      --bg-dark-deep: #05070d;
      --bg-dark-surface: #0e111a;
      --text-main: #ffffff;
      --text-muted: #8c9cad;
      --accent-teal: #00e6f1;
      --accent-neon-green: #a0f000;
      --accent-glow: 0 4px 15px rgba(0, 230, 241, 0.3);
      --card-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
    }

    body {
      background-color: var(--bg-dark-deep);
      color: var(--text-main);
      font-family: 'Poppins', sans-serif;
      overflow-x: hidden;
    }

    .text-muted { color: var(--text-muted) !important; }
    .text-accent-teal { color: var(--accent-teal); }
    .text-accent-neon { color: var(--accent-neon-green); }

    /* --- Navbar --- */
    .navbar-premium {
      background: rgba(14, 17, 26, 0.85);
      backdrop-filter: blur(10px);
      border-radius: 50px;
      padding: 10px 30px;
      margin-top: 20px;
      border: 1px solid rgba(255, 255, 255, 0.05);
    }

    /* Estilo do Logo em Texto */
    .navbar-brand {
      font-size: 1.4rem;
      font-weight: 700;
      color: var(--text-main) !important;
      letter-spacing: -0.5px;
    }
    .navbar-brand i {
      color: var(--accent-teal);
      margin-right: 8px;
    }

    .navbar-nav .nav-link {
      color: var(--text-main) !important;
      font-weight: 500;
      margin-right: 15px;
    }
    .navbar-nav .nav-link:hover { color: var(--accent-teal) !important; }
    .navbar-toggler { border-color: rgba(255, 255, 255, 0.1); }

    .btn-outline-premium {
      border: 2px solid var(--accent-teal);
      color: var(--accent-teal);
      border-radius: 25px;
      padding: 8px 20px;
      font-weight: 600;
      transition: all 0.3s ease;
    }
    .btn-outline-premium:hover {
      background-color: var(--accent-teal);
      color: #000;
      box-shadow: var(--accent-glow);
    }
    .btn-premium {
      background: linear-gradient(45deg, #007681, var(--accent-teal));
      color: #000;
      border-radius: 25px;
      padding: 10px 25px;
      font-weight: 700;
      border: none;
      box-shadow: var(--accent-glow);
    }
    .btn-premium:hover { opacity: 0.9; }

    /* --- Hero Section --- */
    .hero-section {
      position: relative;
      min-height: 100vh;
      display: flex;
      align-items: center;
      padding-top: 150px;
      padding-bottom: 100px;
      /* Fundo com imagem fictícia e sobreposição escura */
      background: linear-gradient(to right, rgba(5, 7, 13, 1) 20%, rgba(5, 7, 13, 0.7) 100%),
                  url('https://images.unsplash.com/photo-1466611653911-95081537e5b7?auto=format&fit=crop&w=1920&q=80') center/cover no-repeat;
    }

    .hero-title {
      /* Ajuste dinâmico: cresce do mobile (2.2rem) até o desktop (4.5rem) */
      font-size: clamp(2.2rem, 5vw, 4.5rem);
      font-weight: 800;
      line-height: 1.1;
      margin-bottom: 20px;
      letter-spacing: -1px;
    }

    .hero-subtitle {
      font-size: clamp(1rem, 2vw, 1.25rem);
      font-weight: 400;
      color: var(--text-main);
      margin-bottom: 50px;
      max-width: 700px;
      line-height: 1.6;
    }

    /* Botões do Hero */
    .btn-hero {
      border-radius: 25px;
      padding: 15px 30px;
      font-weight: 700;
      font-size: 0.95rem;
      border: none;
      box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
      position: relative;
      overflow: hidden;
      display: inline-flex;
      align-items: center;
      justify-content: center;
    }
    .btn-hero-available {
      background: linear-gradient(90deg, #00ced1, var(--accent-teal));
      color: #000;
      text-decoration: none;
    }
    .btn-hero-how {
      background-color: transparent;
      border: 2px solid var(--accent-teal);
      color: var(--accent-teal);
      text-decoration: none;
    }
    .btn-hero-how:hover {
      background-color: rgba(0, 230, 241, 0.1);
      color: var(--accent-teal);
    }

    /* --- Stats Section --- */
    .stats-section { padding: 80px 0; border-bottom: 1px solid rgba(255,255,255,0.05); }
    .stat-number {
      font-size: clamp(2.5rem, 4vw, 3rem);
      font-weight: 800;
      margin-bottom: 0;
    }
    .stat-text {
      font-size: 1.1rem;
      font-weight: 400;
      color: var(--text-muted);
    }

    /* --- Courses Section --- */
    .courses-section {
      padding: 100px 0;
      background-color: var(--bg-dark-deep);
    }
    .course-card {
      background: var(--bg-dark-surface);
      border: 1px solid rgba(255, 255, 255, 0.05);
      border-radius: 20px;
      overflow: hidden;
      transition: all 0.3s ease;
      height: 100%;
      box-shadow: var(--card-shadow);
      display: flex;
      flex-direction: column;
    }
    .course-card:hover {
      transform: translateY(-5px);
      border-color: rgba(0, 230, 241, 0.2);
    }
    .course-image { height: 220px; overflow: hidden; }
    .course-image img { width: 100%; height: 100%; object-fit: cover; }
    .card-body { padding: 30px; display: flex; flex-direction: column; flex-grow: 1; }

    .card-tag {
      font-size: 0.75rem;
      font-weight: 700;
      text-transform: uppercase;
      padding: 4px 8px;
      border-radius: 4px;
      background: rgba(255,255,255,0.05);
      letter-spacing: 0.5px;
    }
    .tag-green { color: var(--accent-neon-green); border: 1px solid rgba(160, 240, 0, 0.2); }
    .tag-teal { color: var(--accent-teal); border: 1px solid rgba(0, 230, 241, 0.2); }
    .tag-purple { color: #c084fc; border: 1px solid rgba(192, 132, 252, 0.2); }

    .course-title {
      font-size: 1.35rem;
      font-weight: 700;
      margin-top: 15px;
      margin-bottom: 15px;
      line-height: 1.4;
    }
    .course-price {
      font-size: 1.5rem;
      font-weight: 800;
    }
    .course-link {
      font-weight: 600;
      color: var(--accent-teal);
      text-decoration: none;
      display: flex;
      align-items: center;
      transition: color 0.3s;
    }
    .course-link:hover { color: #fff; }
    .course-link i { margin-left: 8px; font-size: 0.9rem; }

    /* --- Why Section --- */
    .why-section { padding: 100px 0; background-color: var(--bg-dark-surface); }
    .feature-icon-box {
      width: 70px; height: 70px;
      display: flex; align-items: center; justify-content: center;
      border-radius: 16px;
      background: rgba(0, 230, 241, 0.05);
      border: 1px solid rgba(0, 230, 241, 0.1);
      margin-bottom: 25px;
      color: var(--accent-teal);
      font-size: 1.8rem;
    }
    .feature-title {
      font-size: 1.25rem;
      font-weight: 700;
      margin-bottom: 15px;
    }

    /* --- Footer --- */
    .footer-premium {
      background-color: var(--bg-dark-deep);
      padding: 50px 0 30px;
      border-top: 1px solid rgba(255, 255, 255, 0.05);
    }
    .footer-links a {
      color: var(--text-muted);
      text-decoration: none;
      margin: 0 15px;
      font-size: 0.9rem;
    }
    .footer-links a:hover { color: var(--accent-teal); }
    .social-icons a {
      color: var(--text-muted);
      font-size: 1.2rem;
      margin-left: 20px;
      transition: color 0.3s;
    }
    .social-icons a:hover { color: var(--accent-teal); }

    /* Responsividade Extra para a Navbar no Mobile */
    @media (max-width: 991px) {
      .navbar-premium {
        padding: 15px;
        border-radius: 15px;
      }
      .navbar-collapse {
        background: var(--bg-dark-surface);
        padding: 20px;
        border-radius: 10px;
        margin-top: 15px;
      }
      .btn-hero {
        width: 100%;
        margin-bottom: 10px;
      }
    }