body {
  margin: 0;
  padding: 0;
  font-family: "Segoe UI", "PingFang SC", "Hiragino Sans", Arial, sans-serif;
  background: #f7f9fb;
  color: #222;
  line-height: 1.7;
}

.main-header {
  background: linear-gradient(90deg, #4f8cff 0%, #6ed0f6 100%);
  color: #fff;
  padding: 48px 0 24px 0;
  text-align: center;
  box-shadow: 0 2px 8px rgba(79,140,255,0.08);
}

.main-header h1 {
  margin: 0;
  font-size: 2.8rem;
  letter-spacing: 2px;
  font-weight: 700;
}

.subtitle {
  margin-top: 12px;
  font-size: 1.2rem;
  opacity: 0.92;
}

main {
  max-width: 800px;
  margin: 36px auto 0 auto;
  background: #fff;
  border-radius: 18px;
  box-shadow: 0 4px 24px rgba(79,140,255,0.07);
  padding: 36px 28px 28px 28px;
}

section {
  margin-bottom: 36px;
}

h2 {
  font-size: 1.5rem;
  color: #4f8cff;
  margin-bottom: 16px;
  font-weight: 600;
}

.intro-section p {
  font-size: 1.08rem;
  color: #444;
}

.tutorial-section ol {
  padding-left: 22px;
  font-size: 1.08rem;
}

.image-section .image-wrapper {
  display: flex;
  justify-content: center;
  align-items: center;
  margin-top: 8px;
}

.image-section img {
  max-width: 100%;
  border-radius: 16px;
  box-shadow: 0 4px 24px rgba(110,208,246,0.13);
  transition: transform 0.3s;
}
.image-section img:hover {
  transform: scale(1.03);
}

.links-section ul {
  list-style: none;
  padding: 0;
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
}

.links-section li {
  margin-bottom: 8px;
}

.links-section a {
  color: #4f8cff;
  text-decoration: none;
  font-weight: 500;
  padding: 6px 16px;
  border-radius: 8px;
  background: #eaf4ff;
  transition: background 0.2s, color 0.2s;
}

.links-section a:hover {
  background: #4f8cff;
  color: #fff;
}

footer {
  text-align: center;
  color: #888;
  font-size: 0.98rem;
  margin: 36px 0 18px 0;
}
@media (max-width: 600px) {
  main {
    padding: 18px 6vw 18px 6vw;
  }
  .main-header h1 {
    font-size: 2rem;
  }
  h2 {
    font-size: 1.15rem;
  }
}