:root {
  --bg-1: #0c1726;
  --bg-2: #1d3653;
  --card: #f7f9fc;
  --ink: #13263e;
  --accent: #0f5ea8;
  --line: #d5e0ec;
  --warn-bg: #fff5e8;
  --warn-line: #f2bf77;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at 12% 14%, #2b6fb6 0%, transparent 36%),
    radial-gradient(circle at 90% 0%, #214871 0%, transparent 38%),
    linear-gradient(165deg, var(--bg-1), var(--bg-2));
  padding: 24px;
}

.guide-shell {
  width: min(980px, 100%);
  margin: 0 auto;
  display: grid;
  gap: 14px;
}

.hero,
.panel {
  background: var(--card);
  border-radius: 16px;
  box-shadow: 0 20px 46px rgba(7, 17, 29, 0.27);
  padding: 22px;
}

.eyebrow {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #3e5f85;
  font-weight: 700;
}

h1 {
  margin: 8px 0;
  font-size: 32px;
}

h2 {
  margin: 0 0 10px;
}

.back-link {
  display: inline-block;
  margin-top: 6px;
  color: var(--accent);
  text-decoration: none;
  font-weight: 600;
}

.back-link:hover {
  text-decoration: underline;
}

.steps {
  margin: 0;
  padding-left: 20px;
  display: grid;
  gap: 12px;
}

.steps li {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 12px 14px;
  background: #fff;
}

.steps h3 {
  margin: 0 0 6px;
  font-size: 17px;
}

.steps p {
  margin: 0;
  color: #385676;
}

.diagram {
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fff;
  padding: 14px;
}

.diagram-title {
  font-weight: 700;
  margin-bottom: 8px;
}

pre {
  margin: 0;
  white-space: pre-wrap;
  background: #f1f5fb;
  border: 1px solid #d7e3f0;
  border-radius: 10px;
  padding: 12px;
  overflow: auto;
}

.faq {
  margin: 0;
  padding-left: 18px;
  display: grid;
  gap: 10px;
}

.faq li {
  line-height: 1.55;
}

.faq p {
  margin: 4px 0 0;
  color: #355170;
}

.warning {
  background: var(--warn-bg);
  border: 1px solid var(--warn-line);
}

kbd,
code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  background: #eef3f8;
  border-radius: 6px;
  padding: 1px 6px;
  border: 1px solid #d3ddea;
}

@media (max-width: 740px) {
  body {
    padding: 14px;
  }

  .hero,
  .panel {
    padding: 16px;
  }

  h1 {
    font-size: 24px;
  }
}