:root {
  color-scheme: light;
  --paper: #ffffff;
  --paper-soft: #f3f6f6;
  --ink: #172126;
  --ink-soft: #526168;
  --line: #d7dfe1;
  --teal: #087f79;
  --teal-dark: #075f5b;
  --coral: #dc654f;
  --gold: #c58b19;
  --serif: "Songti SC", "STSong", "Noto Serif CJK SC", "Source Han Serif SC", Georgia, serif;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--serif);
  font-size: 18px;
  line-height: 1.8;
  letter-spacing: 0;
  text-rendering: optimizeLegibility;
}
a { color: var(--teal); text-underline-offset: 0.18em; }
button, a { -webkit-tap-highlight-color: transparent; }

.site-header {
  position: absolute;
  inset: 0 0 auto;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  width: min(1180px, calc(100% - 48px));
  margin: 0 auto;
  padding: 18px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.24);
  color: #fff;
  font-family: var(--sans);
}
.site-brand { display: flex; align-items: center; gap: 11px; color: #fff; text-decoration: none; font-weight: 760; }
.site-brand-mark {
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  border: 1px solid rgba(255, 255, 255, 0.8);
  background: rgba(5, 12, 15, 0.68);
  color: #fff;
  font-family: var(--serif);
  font-size: 17px;
  line-height: 1;
}
.site-header nav { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: 11px 24px; }
.site-header nav a { color: rgba(255, 255, 255, 0.82); text-decoration: none; font-size: 13px; }
.site-header nav a:hover { color: #fff; }

.guide-hero {
  position: relative;
  min-height: 650px;
  max-height: 780px;
  display: flex;
  align-items: flex-end;
  overflow: hidden;
  background: #101619 center / cover no-repeat;
  color: #fff;
}
.guide-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, rgba(7, 13, 16, 0.96) 0%, rgba(7, 13, 16, 0.80) 50%, rgba(7, 13, 16, 0.46) 100%);
}
.guide-hero::after {
  content: "";
  position: absolute;
  inset: auto 0 0;
  height: 5px;
  background: linear-gradient(90deg, var(--coral) 0 22%, var(--gold) 22% 39%, var(--teal) 39% 100%);
}
.hero-inner {
  position: relative;
  z-index: 1;
  width: min(1180px, calc(100% - 48px));
  margin: 0 auto;
  padding: 150px 0 86px;
}
.breadcrumb { margin: 0 0 24px; font-family: var(--sans); font-size: 12px; color: rgba(255, 255, 255, 0.68); }
.breadcrumb a { color: inherit; text-decoration: none; }
.hero-kicker { max-width: 760px; margin: 0 0 17px; color: #e3b550; font-family: var(--sans); font-size: 14px; font-weight: 750; }
.guide-hero h1 { max-width: 900px; margin: 0; font-family: var(--sans); font-size: 62px; line-height: 1.12; letter-spacing: 0; }
.hero-lede { max-width: 780px; margin: 24px 0 0; color: rgba(255, 255, 255, 0.84); font-size: 19px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 31px; font-family: var(--sans); }
.button {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  padding: 9px 17px;
  border: 1px solid rgba(255, 255, 255, 0.56);
  border-radius: 4px;
  color: #fff;
  text-decoration: none;
  font-size: 13px;
  font-weight: 720;
}
.button-primary { border-color: var(--teal); background: var(--teal); }
.button:hover { border-color: #fff; background: rgba(255, 255, 255, 0.1); }
.button-primary:hover { border-color: #0aa49c; background: var(--teal-dark); }

.guide-layout {
  display: grid;
  grid-template-columns: minmax(0, 820px) minmax(220px, 280px);
  gap: 78px;
  width: min(1180px, calc(100% - 48px));
  margin: 0 auto;
  padding: 84px 0 118px;
}
.guide-content { min-width: 0; }
.guide-content h2, .guide-content h3 { font-family: var(--sans); letter-spacing: 0; scroll-margin-top: 24px; }
.guide-content h2 { margin: 58px 0 18px; font-size: 29px; line-height: 1.3; }
.guide-content h2:first-child { margin-top: 0; }
.guide-content h3 { margin: 36px 0 13px; font-size: 20px; line-height: 1.4; }
.guide-content p { margin: 0 0 1.2em; }
.guide-content ul, .guide-content ol { margin: 0 0 1.5em; padding-left: 1.4em; }
.guide-content li { margin: 0.45em 0; padding-left: 0.2em; }
.guide-content strong { font-weight: 760; }
.guide-content blockquote { margin: 32px 0; padding: 20px 24px; border-left: 4px solid var(--coral); background: var(--paper-soft); color: var(--ink-soft); }
.guide-content table { display: block; overflow-x: auto; width: 100%; margin: 28px 0 36px; border-collapse: collapse; font-family: var(--sans); font-size: 13px; line-height: 1.55; }
.guide-content th, .guide-content td { padding: 11px 12px; border: 1px solid var(--line); text-align: left; vertical-align: top; }
.guide-content th { background: var(--paper-soft); }

.guide-side { align-self: start; position: sticky; top: 24px; font-family: var(--sans); }
.guide-side h2 { margin: 0 0 14px; font-size: 13px; }
.guide-side a { display: block; padding: 10px 0; border-top: 1px solid var(--line); color: var(--ink-soft); text-decoration: none; font-size: 12px; line-height: 1.5; }
.guide-side a:hover { color: var(--teal); }
.side-download { margin-top: 26px; padding-top: 18px; border-top: 2px solid var(--ink); }
.side-download strong { display: block; margin-bottom: 5px; color: var(--ink); font-size: 13px; }
.side-download p { margin: 0 0 12px; color: var(--ink-soft); font-size: 11px; line-height: 1.6; }
.side-download a { display: inline; padding: 0; border: 0; color: var(--teal); font-weight: 730; }

.faq-band, .related-band { border-top: 1px solid var(--line); background: var(--paper-soft); }
.band-inner { width: min(1180px, calc(100% - 48px)); margin: 0 auto; padding: 74px 0 84px; }
.band-inner > h2 { margin: 0 0 28px; font-family: var(--sans); font-size: 28px; letter-spacing: 0; }
.faq-item { border-top: 1px solid var(--line); }
.faq-item:last-child { border-bottom: 1px solid var(--line); }
.faq-item h3 { margin: 0; padding: 21px 0 7px; font-family: var(--sans); font-size: 17px; letter-spacing: 0; }
.faq-item p { max-width: 820px; margin: 0; padding: 0 0 22px; color: var(--ink-soft); }
.related-band { background: var(--paper); }
.related-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; }
.related-link { min-height: 160px; padding: 22px; border: 1px solid var(--line); border-radius: 6px; color: var(--ink); text-decoration: none; }
.related-link span { display: block; margin-bottom: 12px; color: var(--coral); font-family: var(--sans); font-size: 11px; font-weight: 750; }
.related-link strong { display: block; font-family: var(--sans); font-size: 18px; line-height: 1.45; }
.related-link:hover { border-color: var(--teal); color: var(--teal); }

.site-footer { background: #11181b; color: rgba(255, 255, 255, 0.64); font-family: var(--sans); }
.footer-inner { display: flex; justify-content: space-between; gap: 30px; width: min(1180px, calc(100% - 48px)); margin: 0 auto; padding: 38px 0; font-size: 12px; }
.footer-inner a { color: rgba(255, 255, 255, 0.76); text-decoration: none; }
.footer-links { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: 10px 20px; }

@media (max-width: 880px) {
  .guide-hero { min-height: 610px; }
  .guide-hero h1 { font-size: 46px; }
  .guide-layout { grid-template-columns: 1fr; gap: 48px; padding-top: 64px; }
  .guide-side { position: static; border-top: 1px solid var(--line); padding-top: 26px; }
  .related-grid { grid-template-columns: 1fr; }
}

@media (max-width: 620px) {
  body { font-size: 16px; line-height: 1.76; }
  .site-header { width: calc(100% - 30px); padding-top: 12px; }
  .site-header nav a:not(:last-child) { display: none; }
  .guide-hero { min-height: 570px; }
  .hero-inner { width: calc(100% - 30px); padding: 128px 0 62px; }
  .guide-hero h1 { font-size: 38px; }
  .hero-lede { font-size: 16px; }
  .guide-layout, .band-inner, .footer-inner { width: calc(100% - 30px); }
  .guide-layout { padding: 54px 0 82px; }
  .guide-content h2 { margin-top: 46px; font-size: 24px; }
  .band-inner { padding: 58px 0 66px; }
  .footer-inner { flex-direction: column; }
  .footer-links { justify-content: flex-start; }
}