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

    body {
      font-family: 'Inter', sans-serif;
      background: #f7f8fc;
      color: #172033;
      line-height: 1.6;
    }

    a {
      text-decoration: none;
    }

    .container {
      width: min(1120px, 92%);
      margin: auto;
    }

    header {
      background: #ffffff;
      border-bottom: 1px solid #e7eaf3;
      position: sticky;
      top: 0;
      z-index: 10;
    }

    .navbar {
      min-height: 74px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 24px;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 22px;
      font-weight: 800;
      color: #1c3faa;
    }

    .logo-icon {
      width: 42px;
      height: 42px;
      border-radius: 12px;
      background: linear-gradient(135deg, #1c3faa, #5577ff);
      color: #ffffff;
      display: grid;
      place-items: center;
      font-size: 22px;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 16px;
      flex-wrap: wrap;
    }

    .nav-links a {
      color: #526079;
      font-weight: 600;
      font-size: 14px;
    }

    .nav-links a:hover {
      color: #1c3faa;
    }

    .hero {
      padding: 86px 0 70px;
      background:
        radial-gradient(circle at top left, rgba(85, 119, 255, 0.16), transparent 34%),
        linear-gradient(180deg, #ffffff, #f7f8fc);
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1.08fr 0.92fr;
      align-items: center;
      gap: 50px;
    }

    .badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 8px 14px;
      border-radius: 999px;
      background: #eef2ff;
      color: #1c3faa;
      font-size: 14px;
      font-weight: 700;
      margin-bottom: 20px;
    }

    .hero h1 {
      font-size: clamp(36px, 5vw, 58px);
      line-height: 1.08;
      letter-spacing: -1.4px;
      margin-bottom: 20px;
    }

    .hero p {
      color: #5d6980;
      font-size: 18px;
      max-width: 620px;
      margin-bottom: 30px;
    }

    .hero-actions {
      display: flex;
      gap: 14px;
      flex-wrap: wrap;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      padding: 14px 22px;
      border-radius: 12px;
      font-weight: 800;
      border: 1px solid transparent;
      transition: 0.2s ease;
      cursor: pointer;
    }

    .btn-primary {
      background: #1c3faa;
      color: #ffffff;
      box-shadow: 0 12px 24px rgba(28, 63, 170, 0.22);
    }

    .btn-primary:hover {
      background: #17358f;
      transform: translateY(-2px);
    }

    .btn-outline {
      background: #ffffff;
      color: #1c3faa;
      border-color: #cfd8ff;
    }

    .btn-outline:hover {
      border-color: #1c3faa;
      transform: translateY(-2px);
    }

    .hero-card {
      background: #ffffff;
      border: 1px solid #e6eaf4;
      border-radius: 26px;
      padding: 28px;
      box-shadow: 0 24px 70px rgba(30, 41, 59, 0.1);
    }

    .book-preview {
      height: 330px;
      border-radius: 22px;
      background: linear-gradient(135deg, #1c3faa, #6f88ff);
      color: #ffffff;
      padding: 30px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      position: relative;
      overflow: hidden;
    }

    .book-preview::after {
      content: '';
      position: absolute;
      width: 170px;
      height: 170px;
      border-radius: 50%;
      background: rgba(255, 255, 255, 0.13);
      right: -40px;
      top: -35px;
    }

    .book-preview h2 {
      font-size: 34px;
      line-height: 1.14;
      max-width: 330px;
      position: relative;
      z-index: 1;
    }

    .book-preview span {
      font-weight: 700;
      opacity: 0.94;
      position: relative;
      z-index: 1;
    }

    .stats {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 14px;
      margin-top: 18px;
    }

    .stat-box {
      background: #f7f8fc;
      padding: 16px;
      border-radius: 16px;
      text-align: center;
    }

    .stat-box strong {
      display: block;
      color: #1c3faa;
      font-size: 22px;
    }

    .stat-box small {
      color: #637087;
      font-weight: 600;
    }

    section {
      padding: 72px 0;
    }

    .section-title {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 42px;
    }

    .section-title h2 {
      font-size: clamp(28px, 4vw, 40px);
      margin-bottom: 12px;
      letter-spacing: -0.7px;
    }

    .section-title p {
      color: #637087;
      font-size: 17px;
    }

    .feature-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 22px;
    }

    .feature-card {
      background: #ffffff;
      border: 1px solid #e6eaf4;
      border-radius: 22px;
      padding: 26px;
      box-shadow: 0 14px 34px rgba(30, 41, 59, 0.06);
    }

    .feature-icon {
      width: 54px;
      height: 54px;
      display: grid;
      place-items: center;
      border-radius: 16px;
      background: #eef2ff;
      color: #1c3faa;
      font-size: 25px;
      margin-bottom: 18px;
    }

    .feature-card h3 {
      font-size: 20px;
      margin-bottom: 10px;
    }

    .feature-card p {
      color: #647189;
      margin-bottom: 20px;
    }

    .login-section {
      background: #101936;
      color: #ffffff;
    }

    .login-section .section-title p {
      color: #c7d0e9;
    }

    .login-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 22px;
    }

    .login-card {
      background: rgba(255, 255, 255, 0.08);
      border: 1px solid rgba(255, 255, 255, 0.12);
      border-radius: 24px;
      padding: 28px;
      backdrop-filter: blur(12px);
    }

    .login-card.important {
      background: #ffffff;
      color: #172033;
      box-shadow: 0 24px 60px rgba(0, 0, 0, 0.25);
      transform: translateY(-10px);
    }

    .tag {
      display: inline-block;
      padding: 6px 12px;
      border-radius: 999px;
      background: #ffcf4a;
      color: #172033;
      font-weight: 800;
      font-size: 12px;
      margin-bottom: 16px;
    }

    .login-card h3 {
      font-size: 24px;
      margin-bottom: 10px;
    }

    .login-card p {
      color: #c7d0e9;
      margin-bottom: 22px;
    }

    .login-card.important p {
      color: #647189;
    }

    .login-card .btn {
      width: 100%;
    }

    .about-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 34px;
      align-items: center;
    }

    .about-box {
      background: #ffffff;
      border: 1px solid #e6eaf4;
      border-radius: 24px;
      padding: 30px;
    }

    .about-box h2 {
      font-size: 36px;
      margin-bottom: 16px;
    }

    .about-box p,
    .about-list li {
      color: #637087;
    }

    .about-list {
      list-style: none;
      display: grid;
      gap: 14px;
    }

    .about-list li {
      background: #ffffff;
      border: 1px solid #e6eaf4;
      border-radius: 16px;
      padding: 16px 18px;
      font-weight: 600;
    }

    .cta {
      text-align: center;
      background: linear-gradient(135deg, #1c3faa, #536dfe);
      color: #ffffff;
      border-radius: 30px;
      padding: 46px 24px;
    }

    .cta h2 {
      font-size: 34px;
      margin-bottom: 12px;
    }

    .cta p {
      color: #e7ebff;
      max-width: 650px;
      margin: 0 auto 24px;
    }

    footer {
      padding: 26px 0;
      text-align: center;
      color: #637087;
      border-top: 1px solid #e6eaf4;
      background: #ffffff;
    }

    @media (max-width: 900px) {
      .hero-grid,
      .about-grid {
        grid-template-columns: 1fr;
      }

      .feature-grid,
      .login-grid {
        grid-template-columns: 1fr;
      }

      .login-card.important {
        transform: none;
      }

      .nav-links {
        display: none;
      }
    }

    @media (max-width: 520px) {
      .hero {
        padding: 58px 0 50px;
      }

      .hero-actions {
        flex-direction: column;
      }

      .btn {
        width: 100%;
      }

      .stats {
        grid-template-columns: 1fr;
      }

      .book-preview {
        height: 280px;
      }
    }