/* Shared reading layout, adapted from the PorePause public pages. */
:root {
  color-scheme: light dark;
  --canvas: #f6f5f2;
  --surface: #ffffff;
  --text: #202a36;
  --secondary: #5c626b;
  --accent: #344d68;
  --on-accent: #ffffff;
  --border: #dedfdc;
  --pad: clamp(1.25rem, 4vw, 2rem);
}
@media (prefers-color-scheme: dark) {
  :root {
    --canvas: #14171c;
    --surface: #20252d;
    --text: #f0f2f5;
    --secondary: #b8c0cc;
    --accent: #b1c9e5;
    --on-accent: #182535;
    --border: #3a424d;
  }
}
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Segoe UI", sans-serif; font-size: 1.0625rem; line-height: 1.7; color: var(--text); background: var(--canvas); }
.site { min-height: 100vh; display: flex; flex-direction: column; }
.wrap { width: min(100% - 2 * var(--pad), 680px); margin-inline: auto; }
a { color: var(--accent); text-underline-offset: .2em; text-decoration-thickness: 1px; }
a:hover { text-decoration: underline; }
a:focus-visible, button:focus-visible, summary:focus-visible { outline: 2px solid var(--accent); outline-offset: 4px; }
.site-header { padding: 1.2rem 0; border-bottom: 1px solid var(--border); }
.header-row, .nav { display: flex; align-items: center; flex-wrap: wrap; gap: .8rem 1.2rem; }
.header-row { justify-content: space-between; }
.brand { color: var(--text); font-size: 1.125rem; font-weight: 650; text-decoration: none; white-space: nowrap; }
.nav { gap: .8rem; }
.nav a { font-size: .9375rem; color: var(--secondary); text-decoration: none; padding-block: .45rem; }
.nav a[aria-current="page"] { color: var(--text); font-weight: 650; }
.lang-toggle { display: inline-flex; gap: .35rem; }
.lang-toggle button { appearance: none; border: 1px solid var(--border); border-radius: 999px; padding: .45rem .7rem; font: inherit; font-size: .8125rem; color: var(--secondary); background: var(--surface); cursor: pointer; }
.lang-toggle button[aria-pressed="true"] { background: var(--accent); border-color: var(--accent); color: var(--on-accent); }
main { flex: 1; padding: 2.6rem 0 3.6rem; }
h1 { margin: 0 0 1rem; font-size: clamp(1.8rem, 5vw, 2.25rem); line-height: 1.25; letter-spacing: -.025em; }
h2 { font-size: 1.125rem; margin: 0 0 .65rem; line-height: 1.5; }
p { color: var(--secondary); margin: 0 0 1rem; overflow-wrap: break-word; }
.policy > p:first-of-type { margin-bottom: 2rem; }
.policy section { margin-bottom: 1.9rem; }
.contact-panel { background: var(--surface); border: 1px solid var(--border); border-radius: 16px; padding: 1.4rem; margin: 1.6rem 0 2.4rem; }
.contact-panel p:last-child { margin-bottom: 0; font-size: .9375rem; }
.contact-address { margin: .8rem 0 .65rem; }
.cta { display: inline-flex; align-items: center; justify-content: center; padding: .75rem 1.25rem; border-radius: 999px; background: var(--accent); color: var(--on-accent); text-decoration: none; font-size: 1rem; font-weight: 600; }
.faq details { border-bottom: 1px solid var(--border); padding: 1rem 0; }
.faq summary { display: flex; align-items: baseline; gap: 1rem; justify-content: space-between; cursor: pointer; font-weight: 600; list-style: none; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; flex: 0 0 1em; text-align: center; font-weight: 400; color: var(--accent); }
.faq details[open] summary::after { content: "−"; }
.faq p { margin: .7rem 0 .15rem; }
.updated { font-size: .875rem; padding-top: .3rem; }
.home-links { display: grid; gap: 1rem; }
.home-links a { display: block; padding: 1.25rem; border: 1px solid var(--border); border-radius: 16px; background: var(--surface); text-decoration: none; }
.home-links a:hover { border-color: var(--accent); }
.home-links strong { display: block; margin-bottom: .25rem; }
.home-links a > span { color: var(--secondary); font-size: .9375rem; }
.site-footer { padding: 1.4rem 0 1.8rem; border-top: 1px solid var(--border); color: var(--secondary); font-size: .875rem; }
.site-footer .wrap { display: flex; justify-content: space-between; flex-wrap: wrap; gap: .5rem 1.25rem; }
/* English remains readable without JavaScript; language selection changes html.lang. */
html:not([lang="zh-Hans"]) [data-lang="zh"], html[lang="zh-Hans"] [data-lang="en"] { display: none !important; }