:root {
  --ink: #17263c;
  --muted: #5f6f88;
  --line: #aeb9cb;
  --paper: #fbfbf7;
  --blue-paper: #dfe9ff;
  --blue: #3559f7;
  --dark: #07111d;
  --yellow: #ffd466;
  --serif: 'Songti SC', 'STSong', 'SimSun', 'Noto Serif CJK SC', serif;
  --sans: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans CJK SC', sans-serif;
  --mono: 'Cascadia Mono', 'SFMono-Regular', Consolas, monospace;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  color: var(--ink);
  background: var(--dark);
  font-family: var(--sans);
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }

button, a { -webkit-tap-highlight-color: transparent; }

.guide-stage {
  min-height: 100vh;
  padding: 36px 24px 72px;
  background: var(--dark);
}

.guide-shell {
  width: min(1200px, 100%);
  margin: 0 auto;
  background: var(--paper);
}

.guide-header {
  position: relative;
  min-height: 340px;
  padding: 48px 48px 44px;
  background: var(--blue-paper);
  overflow: hidden;
}

.guide-header::after {
  content: '';
  position: absolute;
  right: -90px;
  bottom: -150px;
  width: 420px;
  height: 300px;
  border: 1px solid rgba(53, 89, 247, .18);
  border-radius: 50%;
  transform: rotate(-18deg);
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 10px;
  position: relative;
  z-index: 1;
  color: #3658d7;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .12em;
  text-transform: uppercase;
}

.breadcrumb span:last-child { color: var(--muted); }

.page-title {
  position: relative;
  z-index: 1;
  max-width: 780px;
  margin: 34px 0 20px;
  font-family: var(--serif);
  font-size: clamp(42px, 6vw, 78px);
  font-weight: 600;
  letter-spacing: -.075em;
  line-height: 1.08;
}

.page-title em {
  color: var(--blue);
  font-style: normal;
}

.page-intro {
  position: relative;
  z-index: 1;
  max-width: 650px;
  margin: 0;
  color: #41516b;
  font-size: 15px;
  line-height: 1.8;
}

.page-nav {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-bottom: 1px solid var(--line);
}

.page-nav a {
  min-height: 86px;
  padding: 18px 22px 16px;
  border-right: 1px solid var(--line);
  transition: background .2s ease, color .2s ease;
}

.page-nav a:last-child { border-right: 0; }
.page-nav a:hover, .page-nav a[aria-current='page'] { background: #edf2ff; }
.page-nav a[aria-current='page'] .nav-index { color: var(--blue); }

.nav-index {
  display: block;
  margin-bottom: 8px;
  color: #7b8799;
  font-family: var(--mono);
  font-size: 11px;
}

.nav-name { font-family: var(--serif); font-size: 20px; }

.guide-content {
  display: grid;
  grid-template-columns: minmax(0, 1.34fr) minmax(300px, .66fr);
  min-height: 620px;
}

.steps { border-right: 1px solid var(--line); }

.section-heading {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 20px;
  padding: 34px 40px 26px;
  border-bottom: 1px solid var(--line);
}

.section-heading h2 {
  margin: 0;
  font-family: var(--serif);
  font-size: 28px;
  font-weight: 600;
  letter-spacing: -.04em;
}

.section-heading p {
  margin: 0;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: .12em;
  text-transform: uppercase;
}

.step {
  display: grid;
  grid-template-columns: 58px 1fr;
  gap: 20px;
  padding: 29px 40px 30px;
  border-bottom: 1px solid var(--line);
}

.step-number {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border: 1px solid var(--blue);
  color: var(--blue);
  font-family: var(--mono);
  font-size: 12px;
}

.step h3 { margin: 0 0 10px; font-size: 20px; font-weight: 600; letter-spacing: -.03em; }
.step p { margin: 0; color: var(--muted); font-size: 14px; line-height: 1.8; }
.step p + p { margin-top: 10px; }

.step strong { color: var(--ink); font-weight: 600; }

.step-code {
  display: inline-block;
  margin-top: 14px;
  padding: 9px 12px;
  background: #f0f3f7;
  color: #34435b;
  font-family: var(--mono);
  font-size: 12px;
}

.side-panel { padding: 34px 30px; }

.side-kicker {
  margin: 0 0 16px;
  color: var(--blue);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .12em;
}

.side-panel h2 { margin: 0 0 18px; font-family: var(--serif); font-size: 30px; font-weight: 600; line-height: 1.28; letter-spacing: -.045em; }
.side-panel > p { margin: 0; color: var(--muted); font-size: 14px; line-height: 1.8; }

.signal {
  display: grid;
  grid-template-columns: 1fr 1fr;
  margin: 34px -30px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.signal-item { padding: 17px 18px; }
.signal-item + .signal-item { border-left: 1px solid var(--line); }
.signal-label { display: block; margin-bottom: 6px; color: var(--muted); font-family: var(--mono); font-size: 10px; text-transform: uppercase; }
.signal-value { font-family: var(--serif); font-size: 18px; }

.callout {
  margin-top: 30px;
  padding: 20px;
  background: var(--yellow);
}

.callout h3 { margin: 0 0 8px; font-family: var(--serif); font-size: 19px; font-weight: 600; }
.callout p { margin: 0; color: #5d4c1d; font-size: 13px; line-height: 1.7; }

.check-list { display: grid; gap: 12px; margin: 28px 0 0; padding: 0; list-style: none; }
.check-list li { display: grid; grid-template-columns: 22px 1fr; gap: 9px; color: var(--muted); font-size: 13px; line-height: 1.55; }
.check-list li::before { content: '✓'; color: var(--blue); font-family: var(--mono); font-weight: 600; }

.guide-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  min-height: 94px;
  padding: 22px 40px;
  background: var(--yellow);
}

.footer-note { color: #66531d; font-size: 13px; line-height: 1.5; }
.footer-note strong { display: block; margin-bottom: 3px; color: #302a13; font-family: var(--serif); font-size: 16px; }

.footer-actions { display: flex; flex-wrap: wrap; gap: 10px; }
.footer-button { display: inline-flex; align-items: center; gap: 11px; padding: 13px 16px; border: 1px solid #4d431e; background: transparent; color: #302a13; font-size: 13px; transition: background .2s ease; }
.footer-button:hover { background: rgba(255,255,255,.35); }
.footer-button.primary { background: var(--blue); border-color: var(--blue); color: white; }
.footer-button.primary:hover { background: #2447e1; }

.legal-note { margin: 18px 0 0; color: #6c7787; font-size: 12px; line-height: 1.7; }

@media (max-width: 800px) {
  .guide-stage { padding: 0; }
  .guide-header { min-height: 330px; padding: 30px 24px 34px; }
  .page-title { margin-top: 28px; font-size: clamp(40px, 12vw, 62px); }
  .page-nav { grid-template-columns: 1fr; }
  .page-nav a { min-height: auto; border-right: 0; border-bottom: 1px solid var(--line); }
  .page-nav a:last-child { border-bottom: 0; }
  .guide-content { grid-template-columns: 1fr; }
  .steps { border-right: 0; }
  .section-heading { padding: 28px 24px 22px; }
  .step { grid-template-columns: 42px 1fr; gap: 12px; padding: 24px; }
  .side-panel { padding: 30px 24px 36px; border-top: 1px solid var(--line); }
  .signal { margin-left: -24px; margin-right: -24px; }
  .guide-footer { align-items: flex-start; flex-direction: column; padding: 24px; }
  .footer-actions { width: 100%; }
  .footer-button { flex: 1; justify-content: center; }
}