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

    body {
      font-family: 'Quicksand', sans-serif;
      background: linear-gradient(145deg, #FFF7E6 0%, #FFE9D6 100%);
      color: #2D3E50;
      overflow-x: hidden;
    }

    /* floating playful shapes */
    .bg-bubble {
      position: fixed;
      background: rgba(255, 214, 145, 0.3);
      border-radius: 50%;
      pointer-events: none;
      z-index: 0;
      animation: float 12s infinite ease-in-out;
    }

    @keyframes float {
      0% { transform: translateY(0px) rotate(0deg); }
      50% { transform: translateY(-25px) rotate(8deg); }
      100% { transform: translateY(0px) rotate(0deg); }
    }

    .container {
      max-width: 1300px;
      margin: 0 auto;
      padding: 0 30px;
      position: relative;
      z-index: 2;
    }

    /* header */
    .navbar {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 20px 0;
      flex-wrap: wrap;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 12px;
      font-size: 1.9rem;
      font-weight: 800;
      background: linear-gradient(135deg, #FF8A5C, #FF4D6D);
      -webkit-background-clip: text;
      background-clip: text;
      color: transparent;
      letter-spacing: -0.5px;
    }

    .logo i {
      background: none;
      -webkit-background-clip: unset;
      background-clip: unset;
      color: #FF8A5C;
      font-size: 2.2rem;
    }

    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
      flex-wrap: wrap;
    }

    .nav-links a {
      text-decoration: none;
      font-weight: 600;
      color: #4A5B6E;
      transition: all 0.2s ease;
      font-size: 1.1rem;
    }

    .nav-links a:hover {
      color: #FF6B4A;
      transform: translateY(-2px);
    }

    .btn-outline {
      background: transparent;
      border: 2px solid #FF8A5C;
      padding: 8px 20px;
      border-radius: 60px;
      color: #FF6B4A;
      font-weight: 700;
    }

    .btn-outline:hover {
      background: #FF8A5C;
      color: white;
    }

    /* hero */
    .hero {
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 40px;
      padding: 40px 0 60px;
    }

    .hero-text {
      flex: 1;
      min-width: 280px;
    }

    .hero-text h1 {
      font-size: 3.3rem;
      font-weight: 800;
      line-height: 1.2;
      background: linear-gradient(125deg, #FF6B4A, #A45EE5, #3E9FFF);
      -webkit-background-clip: text;
      background-clip: text;
      color: transparent;
      margin-bottom: 20px;
    }

    .hero-text p {
      font-size: 1.25rem;
      color: #4F5E6F;
      margin-bottom: 30px;
      font-weight: 500;
    }

    .btn-primary {
      background: linear-gradient(95deg, #FF8C42, #FF4D6D);
      border: none;
      padding: 14px 36px;
      border-radius: 50px;
      font-weight: 800;
      font-size: 1.2rem;
      color: white;
      cursor: pointer;
      transition: transform 0.2s, box-shadow 0.2s;
      box-shadow: 0 8px 18px rgba(255, 77, 109, 0.3);
      display: inline-block;
      text-decoration: none;
    }

    .btn-primary:hover {
      transform: scale(1.03);
      box-shadow: 0 12px 24px rgba(255, 77, 109, 0.4);
    }

    .hero-stats {
      display: flex;
      gap: 30px;
      margin-top: 35px;
    }

    .stat {
      font-weight: 700;
    }

    .stat span {
      font-size: 1.8rem;
      font-weight: 800;
      color: #FF6B4A;
      display: block;
    }

    .hero-illustration {
      flex: 1;
      text-align: center;
      background: rgba(255, 250, 240, 0.6);
      border-radius: 60% 40% 50% 50%;
      padding: 20px;
      font-size: 9rem;
      backdrop-filter: blur(2px);
      animation: bounceSoft 3s infinite ease;
    }

    @keyframes bounceSoft {
      0%,100%{ transform: translateY(0); }
      50%{ transform: translateY(-12px); }
    }

    /* Section styles */
    .section-title {
      text-align: center;
      font-size: 2.5rem;
      font-weight: 800;
      margin: 50px 0 25px;
      color: #2D3E50;
    }

    .section-title i {
      color: #FFA559;
      margin-right: 12px;
    }

    .subjects-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
      gap: 35px;
      margin: 30px 0 60px;
    }

    .subject-card {
      background: white;
      border-radius: 48px;
      padding: 30px 20px;
      text-align: center;
      transition: all 0.25s ease;
      box-shadow: 0 15px 30px rgba(0, 0, 0, 0.05);
      cursor: pointer;
      border: 1px solid rgba(255, 200, 150, 0.4);
    }

    .subject-card:hover {
      transform: translateY(-12px);
      box-shadow: 0 30px 35px rgba(255, 110, 64, 0.15);
      background: #FFFCF5;
    }

    .subject-icon {
      font-size: 4rem;
      background: #FFF2E5;
      width: 100px;
      height: 100px;
      line-height: 100px;
      border-radius: 50%;
      margin: 0 auto 20px;
    }

    .subject-card h3 {
      font-size: 1.8rem;
      margin-bottom: 12px;
    }

    .subject-card p {
      color: #6A7A8C;
      margin-bottom: 20px;
    }

    .game-tag {
      background: #FFE0B5;
      display: inline-block;
      padding: 6px 16px;
      border-radius: 60px;
      font-weight: 700;
      font-size: 0.8rem;
      color: #C25D00;
    }

    /* demo games row */
    .demo-games {
      display: flex;
      flex-wrap: wrap;
      gap: 30px;
      margin: 40px 0 60px;
    }
    .game-box {
      flex: 1;
      background: rgba(255, 255, 245, 0.9);
      backdrop-filter: blur(2px);
      border-radius: 44px;
      padding: 25px;
      box-shadow: 0 15px 25px rgba(0, 0, 0, 0.1);
      transition: all 0.2s;
      border: 1px solid #FFD5B5;
    }
    .game-box h3 {
      font-size: 1.8rem;
      margin-bottom: 15px;
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .question-area {
      background: #FFFFFFD9;
      border-radius: 40px;
      padding: 20px;
      margin: 20px 0;
    }
    .options {
      display: flex;
      flex-wrap: wrap;
      gap: 15px;
      margin: 20px 0;
    }
    .opt-btn {
      background: #F0EEE9;
      border: none;
      padding: 12px 20px;
      border-radius: 60px;
      font-weight: 700;
      font-size: 1rem;
      font-family: 'Quicksand', monospace;
      cursor: pointer;
      transition: 0.1s;
      flex: 1 0 auto;
      box-shadow: 0 2px 5px rgba(0,0,0,0.05);
    }
    .opt-btn:hover {
      background: #FFD9B5;
      transform: scale(0.98);
    }
    .feedback {
      font-weight: 700;
      margin: 15px 0;
      padding: 10px;
      border-radius: 50px;
      text-align: center;
    }
    .new-btn {
      background: #7C73E6;
      border: none;
      color: white;
      font-weight: 700;
      padding: 10px 20px;
      border-radius: 40px;
      cursor: pointer;
      margin-top: 10px;
      transition: all 0.2s;
    }
    .new-btn:hover {
      background: #5F55C4;
      transform: scale(0.96);
    }
    .correct-fb {
      background: #C8E6D9;
      color: #1F6E43;
    }
    .wrong-fb {
      background: #FFDDDD;
      color: #B33;
    }

    /* features */
    .features-flex {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 30px;
      margin: 40px 0;
    }
    .feature {
      text-align: center;
      flex: 1 1 180px;
      background: white;
      padding: 25px 15px;
      border-radius: 48px;
    }
    .feature i {
      font-size: 2.8rem;
      color: #FF8C42;
    }

    /* cta */
    .cta-section {
      background: linear-gradient(115deg, #FFE3CA, #FFD0B5);
      border-radius: 70px;
      padding: 55px 30px;
      text-align: center;
      margin: 50px 0 40px;
    }
    .cta-section h2 {
      font-size: 2.5rem;
    }
    .btn-cta {
      background: #2F3E46;
      color: white;
      padding: 16px 42px;
      border-radius: 90px;
      font-weight: 800;
      display: inline-block;
      margin-top: 20px;
      text-decoration: none;
      transition: 0.2s;
    }
    .btn-cta:hover {
      background: #1E2C32;
      transform: scale(1.02);
    }

    /* footer */
    footer {
      text-align: center;
      padding: 35px 20px;
      font-size: 0.9rem;
      border-top: 2px dashed #FFC8A2;
      margin-top: 40px;
    }

    @media (max-width: 850px) {
      .hero-text h1 { font-size: 2.4rem; }
      .navbar { flex-direction: column; gap: 15px; }
      .nav-links { justify-content: center; }
      .section-title { font-size: 2rem; }
    }
    @media (max-width: 650px) {
      .container { padding: 0 20px; }
      .hero-illustration { font-size: 6rem; }
      .demo-games { flex-direction: column; }
    }