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

body {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  color: #e8eaf0;
  padding: 16px;
  background: #30E8BF;
  background: -webkit-linear-gradient(to right, #FF8235, #30E8BF);
  background: linear-gradient(to right, #FF8235, #30E8BF);
}

.card {
  border: 1px solid #2a2d3a;
  border-radius: 16px;
  max-width: 580px;
  width: 100%;
  text-align: center;
  box-shadow: 0 8px 40px rgba(0, 0, 0, 0.4);
  overflow: hidden;
}

.card-top {
  background: #ffffff;
  padding: 32px 24px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.logo {
  height: 100px;
  max-width: 100%;
  width: auto;
  object-fit: contain;
}

.card-bottom {
  background: #1a1d27;
  padding: 32px 24px;
}

h1 {
  font-size: 1.6rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 12px;
  letter-spacing: -0.02em;
}

.subtitle {
  font-size: 0.95rem;
  color: #d4d5d6;
  line-height: 1.6;
  margin-bottom: 28px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: #4f6ef7;
  color: #ffffff;
  font-size: 1rem;
  font-weight: 600;
  text-decoration: none;
  padding: 14px 28px;
  border-radius: 10px;
  transition: background 0.2s, transform 0.1s;
  cursor: pointer;
}

.btn:hover {
  background: #3d5ce5;
}

.btn:active {
  transform: scale(0.98);
}

.platform-note {
  margin-top: 16px;
  font-size: 0.8rem;
  color: #555870;
}

@media (max-width: 480px) {
  .logo {
    height: 70px;
  }

  h1 {
    font-size: 1.3rem;
  }

  .btn {
    width: 100%;
    justify-content: center;
    padding: 14px 20px;
  }
}