/* ========== HEADER Y MENÚ ========== */
    header {
      position: sticky;
      top: 0;
      z-index: 100;
      background: var(--azul);
      color: #fff;
      box-shadow: 0 4px 20px rgba(0,0,0,.2);
    }
    .nav-container {
      max-width: 1200px;
      margin: auto;
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 12px 20px;
      gap: 20px;
    }
    .logo img { height: 42px; width: auto; }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 6px;
      list-style: none;
    }
    .nav-links > li { position: relative; }
    .nav-links > li > a,
    .nav-links > li > button {
      background: none;
      border: none;
      color: #fff;
      font: inherit;
      font-weight: 600;
      padding: 10px 14px;
      cursor: pointer;
      border-radius: 10px;
      transition: background .3s;
    }
    .nav-links > li > a:hover,
    .nav-links > li > button:hover { background: var(--morado); }

    /* Mega menú */
    .mega-menu {
      position: absolute;
      top: 100%;
      left: 50%;
      transform: translateX(-50%) translateY(10px);
      width: 720px;
      background: var(--tarjeta);
      color: var(--texto);
      border-radius: 18px;
      box-shadow: var(--sombra);
      padding: 26px;
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
      opacity: 0;
      visibility: hidden;
      transition: all .3s ease;
    }
    .has-mega:hover .mega-menu,
    .has-mega:focus-within .mega-menu {
      opacity: 1;
      visibility: visible;
      transform: translateX(-50%) translateY(0);
    }
    .mega-col h4 {
      color: var(--morado);
      font-size: 1.05rem;
      margin-bottom: 10px;
    }
    .mega-col ul { list-style: none; }
    .mega-col li a {
      display: block;
      padding: 7px 0;
      font-size: .93rem;
      transition: color .2s;
    }
    .mega-col li a:hover { color: var(--cian); }
    .mega-badge {
      display: inline-block;
      background: var(--cian);
      color: #fff;
      font-size: .7rem;
      padding: 2px 8px;
      border-radius: 20px;
      margin-left: 6px;
    }

    .nav-actions { display: flex; align-items: center; gap: 10px; }
    .btn-theme {
      background: transparent;
      border: 2px solid var(--cian);
      color: #fff;
      width: 42px; height: 42px;
      border-radius: 50%;
      cursor: pointer;
      font-size: 1.1rem;
    }
    .btn-small {
      background: var(--cian);
      color: #fff;
      padding: 10px 18px;
      border-radius: 30px;
      font-weight: 600;
      border: none;
      cursor: pointer;
    }

    .menu-toggle {
      display: none;
      background: none;
      border: none;
      color: #fff;
      font-size: 1.6rem;
      cursor: pointer;
    }