:root {
  --guide-paper: #fff;
  --guide-soft: #f4f4f1;
  --guide-ink: #151515;
  --guide-dim: #666660;
  --guide-line: #dfdfda;
  --guide-accent: #956f2f;
}

body.guide-page {
  margin: 0;
  overflow-x: hidden;
  background: var(--guide-paper);
  color: var(--guide-ink);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC", "Segoe UI", sans-serif;
  -webkit-font-smoothing: antialiased;
}

.guide-page header.site { background: rgb(255 255 255 / 92%); }
.guide-page header.site nav { gap: 18px; }
.guide-page header.site nav > a[aria-current="page"] { color: var(--guide-ink); font-weight: 650; }
.guide-page .language-select-wrap { flex: 0 0 auto; }
.guide-page .wrap { width: min(1120px, calc(100% - 64px)); }

.guide-index,
.guide-article { padding: 78px 0 112px; }
.guide-breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  margin-bottom: 44px;
  color: var(--guide-dim);
  font-size: 13px;
}
.guide-breadcrumbs a { color: inherit; text-decoration: none; }
.guide-breadcrumbs a:hover { color: var(--guide-ink); }
.guide-breadcrumbs span::before { content: "/"; margin-right: 7px; color: #aaa9a3; }

.guide-kicker {
  margin: 0 0 14px;
  color: var(--guide-accent);
  font-size: 11px;
  font-weight: 760;
  letter-spacing: .12em;
  text-transform: uppercase;
}
.guide-hero { max-width: 850px; }
.guide-hero h1,
.guide-article h1 {
  margin: 0;
  font-family: ui-rounded, -apple-system, BlinkMacSystemFont, "SF Pro Rounded", "PingFang SC", sans-serif;
  font-size: clamp(44px, 7vw, 76px);
  font-weight: 790;
  letter-spacing: -.045em;
  line-height: 1.05;
  text-wrap: balance;
}
html[lang="zh-Hans"] .guide-hero h1,
html[lang="zh-Hans"] .guide-article h1 { font-size: clamp(40px, 6vw, 66px); letter-spacing: -.035em; }
.guide-lead {
  max-width: 730px;
  margin: 24px 0 0;
  color: var(--guide-dim);
  font-size: 19px;
  line-height: 1.7;
}
.guide-meta { margin-top: 22px; color: #85857f; font-size: 13px; }

.guide-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin-top: 62px;
}
.guide-card {
  display: flex;
  min-height: 300px;
  padding: 28px;
  border: 1px solid var(--guide-line);
  border-radius: 24px;
  color: inherit;
  background: var(--guide-paper);
  flex-direction: column;
  text-decoration: none;
  transition: transform .2s ease, border-color .2s ease, box-shadow .2s ease;
}
.guide-card:hover { transform: translateY(-3px); border-color: #c8c8c1; box-shadow: 0 16px 36px rgb(20 20 20 / 7%); }
.guide-card-number { color: var(--guide-accent); font-size: 12px; font-weight: 760; letter-spacing: .08em; }
.guide-card h2 { margin: 68px 0 0; font-size: 28px; letter-spacing: -.035em; line-height: 1.12; }
.guide-card p { margin: 14px 0 0; color: var(--guide-dim); font-size: 15px; line-height: 1.65; }
.guide-card-cta { margin-top: auto; padding-top: 28px; font-size: 13px; font-weight: 680; }

.guide-principles {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 28px;
  margin-top: 86px;
  padding-top: 50px;
  border-top: 1px solid var(--guide-line);
}
.guide-principles h2 { grid-column: 1 / -1; margin: 0 0 2px; font-size: 32px; }
.guide-principles h3 { margin: 0 0 9px; font-size: 16px; }
.guide-principles p { margin: 0; color: var(--guide-dim); line-height: 1.7; }

.guide-article-header { max-width: 900px; }
.guide-article-header .guide-lead { max-width: 790px; }
.guide-answer {
  margin-top: 46px;
  padding: 28px 30px;
  border: 1px solid var(--guide-line);
  border-radius: 20px;
  background: var(--guide-soft);
}
.guide-answer-label { display: block; margin-bottom: 9px; color: var(--guide-accent); font-size: 11px; font-weight: 760; letter-spacing: .1em; text-transform: uppercase; }
.guide-answer p { margin: 0; font-size: 19px; font-weight: 650; line-height: 1.55; }

.guide-article-layout {
  display: grid;
  grid-template-columns: minmax(0, 760px) minmax(220px, 1fr);
  gap: 78px;
  margin-top: 68px;
  align-items: start;
}
.guide-content { min-width: 0; }
.guide-content h2 { margin: 58px 0 16px; font-size: clamp(28px, 3vw, 38px); letter-spacing: -.035em; line-height: 1.12; }
.guide-content h2:first-child { margin-top: 0; }
.guide-content h3 { margin: 32px 0 10px; font-size: 20px; letter-spacing: -.02em; }
.guide-content p,
.guide-content li { color: var(--guide-dim); font-size: 17px; line-height: 1.8; }
.guide-content p { margin: 0; }
.guide-content p + p { margin-top: 17px; }
.guide-content ul,
.guide-content ol { margin: 18px 0 0; padding-left: 24px; }
.guide-content li + li { margin-top: 9px; }
.guide-content strong { color: var(--guide-ink); }
.guide-content a { color: var(--guide-ink); text-underline-offset: 4px; }

.guide-formula {
  margin: 28px 0;
  padding: 24px;
  border-left: 3px solid var(--guide-accent);
  border-radius: 0 16px 16px 0;
  background: var(--guide-soft);
}
.guide-formula code { display: block; color: var(--guide-ink); font: 680 18px/1.55 ui-monospace, SFMono-Regular, Menlo, monospace; white-space: normal; }
.guide-formula small { display: block; margin-top: 10px; color: var(--guide-dim); font-size: 13px; line-height: 1.55; }
.guide-example { margin: 28px 0; padding: 24px; border: 1px solid var(--guide-line); border-radius: 18px; }
.guide-example strong { display: block; margin-bottom: 9px; }
.guide-example p { font-size: 16px; }

.guide-figure { margin: 34px 0; padding: 24px; border-radius: 24px; background: var(--guide-soft); }
.guide-figure img { display: block; width: min(100%, 520px); max-height: 620px; margin: auto; object-fit: contain; border-radius: 18px; }
.guide-figure figcaption { max-width: 620px; margin: 15px auto 0; color: var(--guide-dim); font-size: 13px; line-height: 1.55; text-align: center; }

.guide-toc { position: sticky; top: 104px; padding: 22px; border: 1px solid var(--guide-line); border-radius: 18px; }
.guide-toc strong { display: block; margin-bottom: 12px; font-size: 13px; }
.guide-toc a { display: block; padding: 7px 0; color: var(--guide-dim); font-size: 13px; line-height: 1.4; text-decoration: none; }
.guide-toc a:hover { color: var(--guide-ink); }

.guide-note { margin-top: 44px; padding-top: 24px; border-top: 1px solid var(--guide-line); color: var(--guide-dim); font-size: 14px; line-height: 1.7; }
.guide-related { margin-top: 80px; padding-top: 52px; border-top: 1px solid var(--guide-line); }
.guide-related h2 { margin: 0; font-size: 30px; }
.guide-related-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; margin-top: 22px; }
.guide-related a { padding: 22px; border: 1px solid var(--guide-line); border-radius: 18px; color: inherit; text-decoration: none; }
.guide-related a:hover { border-color: #c5c5be; background: var(--guide-soft); }
.guide-related strong { display: block; font-size: 17px; }
.guide-related span { display: block; margin-top: 7px; color: var(--guide-dim); font-size: 13px; line-height: 1.55; }

.guide-cta { margin-top: 86px; padding: 52px; border-radius: 28px; background: var(--guide-soft); text-align: center; }
.guide-cta h2 { max-width: 650px; margin: 0 auto; font-size: clamp(32px, 4vw, 48px); }
.guide-cta p { max-width: 610px; margin: 16px auto 0; color: var(--guide-dim); font-size: 16px; line-height: 1.7; }
.guide-cta .app-store-badge { display: inline-flex; margin-top: 28px; }

.guide-page footer.site { border-top: 1px solid var(--guide-line); }
.guide-page .foot nav { display: flex; gap: 20px; }

@media (max-width: 900px) {
  .guide-grid { grid-template-columns: 1fr; }
  .guide-card { min-height: 230px; }
  .guide-card h2 { margin-top: 40px; }
  .guide-principles { grid-template-columns: 1fr; gap: 22px; }
  .guide-article-layout { grid-template-columns: 1fr; gap: 0; }
  .guide-toc { display: none; }
}

@media (max-width: 620px) {
  .guide-page .wrap { width: calc(100% - 36px); }
  .guide-page header.site nav > a { display: none; }
  .guide-index,
  .guide-article { padding: 54px 0 76px; }
  .guide-breadcrumbs { margin-bottom: 34px; }
  .guide-lead { font-size: 17px; }
  .guide-grid { margin-top: 44px; }
  .guide-card { min-height: 220px; padding: 24px; border-radius: 20px; }
  .guide-card h2 { font-size: 25px; }
  .guide-answer { margin-top: 34px; padding: 22px; }
  .guide-answer p { font-size: 17px; }
  .guide-article-layout { margin-top: 48px; }
  .guide-content p,
  .guide-content li { font-size: 16px; }
  .guide-content h2 { margin-top: 46px; }
  .guide-formula,
  .guide-example { padding: 20px; }
  .guide-formula code { font-size: 15px; }
  .guide-figure { margin-inline: -8px; padding: 16px; }
  .guide-related-grid { grid-template-columns: 1fr; }
  .guide-cta { margin-top: 64px; padding: 38px 20px; border-radius: 22px; }
  .guide-page .foot nav { flex-wrap: wrap; }
}