:root {
  color-scheme: light;
  --paper: #ffffff;
  --ink: #192127;
  --muted: #55626c;
  --line: #dce1e5;
  --wash: #f3f5f6;
  --accent: #175f53;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans", Helvetica, Arial, sans-serif;
  font-size: 16px;
  background: var(--paper);
  color: var(--ink);
}

* { box-sizing: border-box; }
body { margin: 0; }
a { color: var(--accent); text-decoration-thickness: 1px; text-underline-offset: 0.2em; }
a:hover { text-decoration-thickness: 2px; }
a:focus-visible, summary:focus-visible { outline: 3px solid var(--accent); outline-offset: 5px; border-radius: 2px; }
p, li { line-height: 1.75; }
p { margin: 0 0 1.1rem; }
ul, ol { padding-left: 1.4rem; margin: 0 0 1.25rem; }
li + li { margin-top: 0.5rem; }
h1, h2, h3 { text-wrap: balance; }
h1 { font-size: clamp(2.25rem, 6vw, 3.75rem); font-weight: 650; letter-spacing: -0.045em; line-height: 1.12; margin: 0 0 1.15rem; }
h2 { font-size: clamp(1.5rem, 4vw, 1.9rem); font-weight: 650; letter-spacing: -0.025em; line-height: 1.25; margin: 0 0 1rem; }
h3 { font-size: 1.125rem; font-weight: 650; line-height: 1.5; margin: 0 0 0.7rem; }
strong { font-weight: 650; }
[id] { scroll-margin-top: 1.5rem; }
.shell { width: min(100% - 3rem, 960px); margin-inline: auto; }
.site-header { display: flex; align-items: center; justify-content: space-between; gap: 1rem 2rem; padding-block: 1.65rem; border-bottom: 1px solid var(--line); }
.wordmark { color: var(--ink); font-size: 1.35rem; font-weight: 750; letter-spacing: -0.055em; text-decoration: none; }
.site-nav { display: flex; gap: 0.5rem 1.4rem; flex-wrap: wrap; }
.site-nav a { font-size: 0.875rem; color: var(--muted); padding-block: 0.4rem; }
.site-nav a[aria-current="page"] { color: var(--ink); font-weight: 650; }
.skip-link { position: absolute; top: 0.5rem; left: 1rem; padding: 0.8rem 1rem; transform: translateY(-200%); background: var(--paper); z-index: 2; }
.skip-link:focus { transform: none; }
.language-nav { display: flex; gap: 1.4rem; padding-block: 1.5rem 0; font-size: 0.875rem; }
.language-nav a { padding-block: 0.45rem; }
.document { max-width: 720px; padding-block: 3.5rem 4rem; }
.document + .document { border-top: 1px solid var(--line); }
.eyebrow { color: var(--muted); font-size: 0.8125rem; font-weight: 650; letter-spacing: 0.035em; margin-bottom: 0.9rem; }
.intro { font-size: 1.125rem; line-height: 1.7; color: var(--muted); max-width: 39rem; }
.meta { font-size: 0.875rem; color: var(--muted); }
.contact { margin-block: 2rem 3rem; padding: 1.5rem; background: var(--wash); border-radius: 12px; }
.contact p:last-child { margin-bottom: 0; }
.contact-address { font-size: clamp(1.125rem, 4.4vw, 1.5rem); font-weight: 600; letter-spacing: -0.015em; overflow-wrap: anywhere; }
.contact-note { margin-top: 0.75rem; font-size: 0.9375rem; color: var(--muted); }
.section { margin-top: 2.75rem; }
.faq-list { border-top: 1px solid var(--line); }
details { border-bottom: 1px solid var(--line); }
summary { padding-block: 1.2rem; padding-right: 0.5rem; line-height: 1.5; font-size: 1.0625rem; font-weight: 600; cursor: pointer; }
summary::marker { color: var(--muted); font-size: 0.8em; }
.answer { padding: 0.1rem 0 0.3rem 1.2rem; }
.answer p, .answer li { color: var(--muted); }
.answer strong { color: var(--ink); }
.note { padding-left: 1rem; border-left: 3px solid var(--line); color: var(--muted); font-size: 0.9375rem; }
.jump-list { display: flex; gap: 0.45rem 1.2rem; flex-wrap: wrap; list-style: none; padding: 0; margin: 1.5rem 0 2.5rem; font-size: 0.875rem; }
.jump-list li + li { margin-top: 0; }
.jump-list a { display: inline-block; padding-block: 0.3rem; }
.back-link { margin-top: 2.5rem; font-size: 0.875rem; }
.site-footer { padding-block: 1.5rem 2.5rem; border-top: 1px solid var(--line); display: flex; justify-content: space-between; flex-wrap: wrap; gap: 0.75rem 2rem; color: var(--muted); font-size: 0.8125rem; }
.site-footer p { margin: 0; }
article[lang="zh-Hans"] { line-break: strict; }
article[lang="zh-Hans"] h1 { letter-spacing: -0.035em; }
article[lang="zh-Hans"] p, article[lang="zh-Hans"] li { line-height: 1.9; }

@media (max-width: 540px) {
  .shell { width: min(100% - 2.25rem, 960px); }
  .site-header { align-items: flex-start; padding-block: 1.25rem; }
  .site-nav { gap: 0.35rem 0.9rem; justify-content: flex-end; }
  .document { padding-block: 2.25rem 3rem; }
  .contact { padding: 1.25rem; margin-block: 1.75rem 2.5rem; }
  .section { margin-top: 2.25rem; }
  .answer { padding-left: 0; }
}

@media print {
  .shell { width: 100%; }
  .site-nav, .language-nav, .skip-link, .back-link { display: none; }
  .document { max-width: none; padding-block: 2rem; }
  .contact { border: 1px solid var(--line); }
  a { color: inherit; }
  .section { break-inside: avoid; }
}