.extension-page {
  max-width: 1000px;
  margin: auto;
  padding: 0 32px;
}
.extension-hero {
  text-align: center;
  padding: 72px 0 48px;
}
.extension-hero h1 {
  font-size: clamp(38px, 6vw, 64px);
  line-height: 1.22;
  margin: 20px 0;
}
.extension-intro {
  color: #586174;
  line-height: 1.9;
  font-size: 18px;
}
.extension-notice {
  padding: 24px 28px;
  border: 1px solid #d6e2ff;
  border-radius: 16px;
  background: #edf3ff;
  line-height: 1.85;
}
.extension-notice p {
  margin-bottom: 0;
  color: #465776;
  font-size: 14px;
}
.extension-flow {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  padding: 48px 0;
  border-bottom: 1px solid var(--line);
}
.extension-flow span {
  display: block;
  color: var(--blue);
  font-size: 13px;
  margin-bottom: 12px;
}
.extension-flow p {
  color: var(--muted);
  font-size: 14px;
  line-height: 1.7;
}
.guide-section {
  padding: 52px 0;
  border-bottom: 1px solid var(--line);
}
.guide-section h2 {
  font-size: 30px;
  margin: 12px 0 30px;
  letter-spacing: -0.7px;
}
.install-steps {
  list-style: none;
  padding: 0;
  margin: 0;
}
.install-steps > li {
  display: flex;
  gap: 22px;
  padding: 24px 0;
}
.step-number {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: #eaf0ff;
  color: var(--blue);
  font-weight: 700;
}
.install-steps h3 {
  margin: 3px 0 16px;
  font-size: 20px;
}
.install-steps p,
.install-steps ul,
.takeover > p {
  font-size: 15px;
  line-height: 1.9;
  color: #586174;
}
.install-steps ul {
  padding-left: 22px;
}
.install-steps code {
  padding: 3px 6px;
  border-radius: 4px;
  background: #edf0f6;
  overflow-wrap: anywhere;
  font-size: 13px;
}
.install-steps .guide-muted {
  color: var(--muted);
  font-size: 13px;
}
.install-steps blockquote {
  margin: 20px 0;
  border-left: 3px solid var(--blue);
  padding: 16px 20px;
  background: #f0f4ff;
  line-height: 1.8;
}
@media (max-width: 600px) {
  .extension-page {
    padding: 0 22px;
  }
  .extension-hero {
    padding-top: 40px;
  }
  .extension-intro {
    font-size: 15px;
  }
  .extension-flow {
    grid-template-columns: 1fr;
    gap: 18px;
    padding: 32px 0;
  }
  .extension-flow p {
    margin-bottom: 0;
  }
  .extension-notice {
    padding: 20px;
  }
  .guide-section {
    padding: 36px 0;
  }
  .guide-section h2 {
    font-size: 26px;
  }
  .install-steps > li {
    gap: 12px;
  }
  .install-steps h3 {
    font-size: 18px;
  }
}