:root {
  --ink: #101828;
  --muted: #475467;
  --soft: #7c8aa5;
  --line: #d8e3f3;
  --paper: #fff;
  --blue: #155eef;
  --blue-deep: #0b4dcc;
  --blue-soft: #edf4ff;
  --blue-pale: #f7faff;
  --page-pad: clamp(24px, 4.6vw, 72px);
  --content-pad: calc(var(--page-pad) + 36px);
  --header-height: 96px;
  font-family: 'PingFang SC', 'Microsoft YaHei', -apple-system, sans-serif;
  font-synthesis: none;
  text-rendering: optimizeLegibility;
  color: var(--ink);
  background: var(--paper);
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; min-width: 320px; line-height: 1.8; background: var(--paper); -webkit-font-smoothing: antialiased; }
body:not(.page-home) main { padding-top: var(--header-height); }
button, input, textarea { font: inherit; }
a { color: inherit; text-decoration: none; }
button { cursor: pointer; }
button:disabled { cursor: not-allowed; opacity: .45; }
button:focus-visible, a:focus-visible, input:focus-visible, textarea:focus-visible, summary:focus-visible { outline: 3px solid #a7c7ff; outline-offset: 4px; }
[hidden] { display: none !important; }
::selection { background: #d7e7ff; }
.skip { position: fixed; top: -80px; left: 20px; z-index: 100; background: var(--blue); color: #fff; padding: 10px 20px; }
.skip:focus { top: 12px; }
.wrap { max-width: 1440px; margin: 0 auto; padding-left: var(--content-pad); padding-right: var(--content-pad); }
.site-header { position: absolute; z-index: 20; top: 0; left: 0; width: 100%; height: var(--header-height); padding: 0 clamp(24px, 3.4vw, 52px); display: flex; align-items: center; justify-content: space-between; gap: 30px; }
.page-home .site-header { background: linear-gradient(180deg, #ffffffeb, #ffffff70 70%, transparent); }
.brand { display: flex; align-items: center; gap: 10px; white-space: nowrap; }
.brand img { display: block; flex: 0 0 auto; }
.brand-name { color: #154c98; font-size: 29px; font-weight: 600; letter-spacing: -.7px; }
.brand-tagline { margin-left: 7px; color: var(--muted); font-size: 12px; font-weight: 400; }
.site-nav { display: flex; align-items: center; gap: clamp(22px, 2.7vw, 42px); }
.site-nav a { position: relative; padding: 24px 0 11px; display: grid; gap: 1px; font-size: 13px; color: var(--muted); line-height: 1.7; }
.site-nav a small { font-size: 8px; color: #858d9c; letter-spacing: .04em; }
.site-nav a:after { content: ''; position: absolute; left: 0; bottom: 0; height: 2px; width: 0; background: var(--blue); transition: width .18s ease; }
.site-nav a:hover:after, .site-nav a[aria-current]:after { width: 100%; }
.site-nav a[aria-current] { color: var(--blue); font-weight: 650; }
.menu-toggle { display: none; }
.eyebrow { margin: 0; color: var(--blue); font-size: 10px; font-weight: 650; letter-spacing: .16em; text-transform: uppercase; }
.home-hero { position: relative; min-height: min(780px, calc(100svh - 95px)); padding: 142px var(--page-pad) 75px; display: grid; grid-template-columns: minmax(380px, .84fr) minmax(500px, 1.16fr); overflow: hidden; }
.hero-copy { position: relative; z-index: 3; align-self: center; padding: 10px 0 18px 36px; }
.hero-copy h1 { margin: 18px 0 0; font-size: clamp(54px, 4.9vw, 76px); line-height: 1.24; letter-spacing: -.055em; font-weight: 650; white-space: nowrap; }
.hero-lede { margin: 35px 0 0; color: var(--muted); font-size: clamp(17px, 1.55vw, 23px); line-height: 1.9; }
.hero-actions { margin-top: 42px; display: flex; align-items: center; gap: 38px; }
.button { min-height: 55px; padding: 0 25px; border: 1px solid transparent; display: inline-flex; align-items: center; justify-content: center; gap: 20px; font-size: 14px; line-height: 1.8; border-radius: 0; transition: background-color .16s ease, transform .16s ease; }
.button:not(:disabled):hover { transform: translateY(-2px); }
.dark { background: var(--blue); color: #fff; font-weight: 600; }
.dark:hover { background: var(--blue-deep); }
.outline { background: #fff; border-color: #c7d7fe; color: var(--blue); }
.outline:hover { background: var(--blue-soft); }
.text-link { min-height: 44px; display: inline-flex; align-items: center; gap: 14px; font-size: 14px; font-weight: 600; border-bottom: 1px solid transparent; }
.text-link:hover { border-color: currentColor; }
.hero-visual { position: absolute; z-index: 1; top: 0; right: 0; width: 57%; height: 100%; background: #f5f5f4; overflow: hidden; }
.hero-visual:after { content: ''; position: absolute; inset: 0; background: linear-gradient(90deg, #fff 0%, #ffffffd9 7%, #ffffff55 20%, transparent 34%), linear-gradient(0deg, #fff 0%, #ffffff00 15%); pointer-events: none; }
.hero-visual img { width: 100%; height: 100%; object-fit: cover; object-position: 100% center; display: block; transform: scale(1.08); transform-origin: right center; filter: brightness(1.06) contrast(.94) saturate(.72); }
.latest-strip { display: grid; grid-template-columns: 1fr auto; align-items: center; gap: 45px; margin: 0 var(--content-pad); padding: 26px 0; border-top: 1px solid var(--line); }
.latest-note { display: grid; grid-template-columns: 190px minmax(0, 1fr) 20px; gap: 24px; align-items: center; }
.latest-note>span { color: var(--blue); font-size: 9px; letter-spacing: .07em; }
.latest-note strong { font-size: 13px; font-weight: 500; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.latest-note i { font-style: normal; color: var(--blue); }
.latest-note:hover strong { color: var(--blue); }
.latest-all { font-size: 12px; color: var(--muted); white-space: nowrap; }
.latest-all span { margin-left: 16px; }
.site-footer { min-height: 190px; padding: 43px var(--content-pad); display: grid; grid-template-columns: 1.2fr 1fr auto; gap: 45px; align-items: end; background: var(--blue-pale); color: var(--muted); font-size: 11px; border-top: 1px solid var(--line); }
.footer-brand .brand-name { font-size: 26px; }
.footer-brand img { width: 37px; height: 37px; }
.footer-brand .brand-tagline { font-size: 11px; }
.footer-main p { margin: 20px 0 0; }
.footer-nav { display: flex; flex-wrap: wrap; gap: 15px 23px; }
.footer-nav a:hover { color: var(--blue); }
.copyright { margin: 0; white-space: nowrap; font-size: 10px; }
.page-intro { min-height: 450px; padding-top: 95px; padding-bottom: 68px; background: linear-gradient(135deg, var(--blue-pale), #fff 65%); border-bottom: 1px solid var(--line); max-width: none; }
.page-intro h1 { max-width: 1120px; margin: 23px 0 0; font-size: clamp(46px, 5.7vw, 78px); line-height: 1.2; letter-spacing: -.06em; font-weight: 620; }
.page-intro>p { max-width: 690px; margin: 32px 0 0 42%; color: var(--muted); font-size: 17px; line-height: 1.95; }
.page-intro.compact { min-height: 350px; padding-top: 72px; padding-bottom: 55px; }
.page-intro.compact h1 { font-size: clamp(38px, 4.6vw, 64px); }
.page-intro.compact>p { margin-left: 0; max-width: none; font-size: 16px; }
.highlight { color: var(--blue); }
.archive-section { padding-top: 48px; padding-bottom: 100px; min-height: 420px; }
.archive-tools { display: flex; justify-content: space-between; gap: 24px; border-bottom: 1px solid var(--ink); padding-bottom: 24px; align-items: center; }
.filter-tabs { display: flex; gap: 12px; }
.filter-tabs button { font-size: 13px; padding: 9px 18px; border: 0; background: transparent; color: var(--muted); }
.filter-tabs button.active { color: var(--blue); background: var(--blue-soft); }
.search-box { display: flex; gap: 12px; align-items: center; border-bottom: 1px solid #c4d3ec; padding: 5px 0; width: 310px; }
.search-box>span { font-size: 23px; color: var(--soft); line-height: 1; }
.search-box input { border: 0; background: transparent; width: 100%; min-width: 0; padding: 8px 3px; font-size: 13px; color: var(--ink); }
.results-line { font-size: 11px; color: var(--soft); margin: 25px 0 0; }
.archive-grid { display: block; }
.digest-card { display: grid; grid-template-columns: 170px minmax(0, 1fr) 110px; column-gap: 40px; padding: 34px 0; border-bottom: 1px solid var(--line); }
.card-top { grid-row: 1 / 4; display: flex; flex-direction: column; align-items: start; gap: 18px; color: var(--soft); font-size: 12px; padding-top: 5px; }
.pill { color: var(--blue); font-size: 10px; font-weight: 600; letter-spacing: .08em; }
.digest-card h3 { grid-column: 2; grid-row: 1; margin: 0; font-size: 25px; line-height: 1.65; letter-spacing: -.03em; font-weight: 600; }
.digest-card:hover h3 { color: var(--blue); }
.digest-card>p { grid-column: 2; margin: 15px 0 18px; color: var(--muted); font-size: 13px; line-height: 1.9; }
.tags { grid-column: 2; display: flex; flex-wrap: wrap; gap: 8px 18px; }
.tag { color: var(--soft); font-size: 10px; }
.tag:before { content: '# '; color: #9cb3d8; }
.card-bottom { grid-column: 3; grid-row: 1 / 4; display: flex; flex-direction: column-reverse; justify-content: space-between; align-items: end; text-align: right; color: var(--soft); font-size: 10px; gap: 24px; }
.arrow { font-size: 24px; color: var(--blue); line-height: 1; }
.archive-cta { margin-top: 36px; padding: 22px 0; display: flex; align-items: center; justify-content: space-between; color: var(--muted); font-size: 14px; }
.archive-cta .text-link { color: var(--blue); }
.empty-state { text-align: center; padding: 60px 20px; }
.empty-state>span { font-size: 40px; color: var(--soft); }
.empty-state h3 { font-size: 22px; font-weight: 550; }
.empty-state p { font-size: 14px; color: var(--muted); margin-bottom: 30px; }
.reading-top { padding-top: 40px; padding-bottom: 42px; display: flex; justify-content: space-between; align-items: center; }
.small-button { border: 1px solid #c7d7fe; background: #fff; color: var(--blue); padding: 9px 15px; font-size: 12px; }
.reading-layout { display: grid; grid-template-columns: 165px minmax(0, 1fr); gap: clamp(40px, 6vw, 100px); padding-bottom: 90px; max-width: 1360px; }
.reading-nav { position: sticky; top: 35px; align-self: start; font-size: 12px; }
.reading-nav b { display: block; color: var(--blue); font-size: 10px; letter-spacing: .12em; font-weight: 600; margin-bottom: 22px; }
.reading-nav a { display: block; border-bottom: 1px solid var(--line); padding: 12px 0; color: var(--muted); }
.reading-nav a:hover { color: var(--blue); }
.reading-nav a span { color: var(--soft); font-size: 10px; margin-right: 16px; }
.article-header { border-bottom: 1px solid var(--ink); padding-bottom: 34px; }
.article-header h1 { margin: 22px 0; font-size: clamp(31px, 3.2vw, 46px); font-weight: 600; line-height: 1.55; letter-spacing: -.035em; }
.article-subtitle { color: var(--muted); font-size: 16px; line-height: 2; }
.article-meta, .article-time { color: var(--soft); font-size: 11px; }
.source-note { margin-top: 25px; color: var(--muted); font-size: 12px; line-height: 1.95; padding-left: 18px; border-left: 2px solid #a9c7fc; }
.topic-article { padding: 40px 0; border-bottom: 1px solid var(--line); scroll-margin-top: 30px; }
.topic-article h2 { font-size: 28px; line-height: 1.6; letter-spacing: -.025em; font-weight: 600; margin: 14px 0; }
.topic-article>p { font-size: 15px; line-height: 2.15; margin: 22px 0; }
.editor-note { background: var(--blue-pale); border-left: 2px solid #b7d0fb; padding: 18px 22px; margin: 27px 0; }
.editor-note b { color: var(--blue); font-size: 10px; font-weight: 600; letter-spacing: .09em; }
.editor-note p { color: var(--muted); font-size: 13px; margin: 8px 0 0; line-height: 2; }
details { font-size: 13px; }
summary { color: var(--blue); cursor: pointer; }
blockquote { border-left: 1px solid #b9cce9; margin: 22px 0; padding-left: 20px; }
blockquote p { margin: 0 0 8px; }
cite { font-style: normal; color: var(--soft); font-size: 11px; }
details small { color: var(--soft); font-size: 11px; }
.related-links { display: flex; flex-wrap: wrap; gap: 15px; margin-top: 16px; font-size: 12px; color: var(--blue); }
.related-links a:hover { text-decoration: underline; }
.followups { padding: 40px 0; }
.followups h2 { font-size: 27px; font-weight: 600; }
.followups ul { padding: 0; list-style: none; }
.followups li { border-bottom: 1px solid var(--line); padding: 17px 0; font-size: 13px; }
.followups li span { display: block; color: var(--blue); font-size: 10px; margin-bottom: 7px; }
.muted { color: var(--soft); font-size: 11px; }
.article-next { display: flex; justify-content: space-between; gap: 20px; padding-top: 25px; border-top: 1px solid var(--ink); font-size: 13px; color: var(--blue); }
textarea { resize: vertical; line-height: 1.95; }
textarea::placeholder, input::placeholder { color: #8d99ab; }
.button-row { display: flex; align-items: center; gap: 14px; flex-wrap: wrap; margin-top: 23px; }
.button-row .button { min-height: 47px; padding: 9px 20px; font-size: 12px; }
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 100px; padding-top: 75px; padding-bottom: 90px; }
.about-grid h2 { font-size: 36px; line-height: 1.6; font-weight: 550; letter-spacing: -.035em; margin: 24px 0; }
.about-grid p { font-size: 15px; line-height: 2; color: var(--muted); }
.principles>div { border-top: 1px solid var(--line); padding: 27px 0 27px 50px; position: relative; }
.principles span { position: absolute; left: 0; top: 30px; color: var(--blue); font-size: 11px; }
.principles h3 { font-size: 21px; font-weight: 550; margin: 0 0 10px; }
.principles p { font-size: 13px; margin: 0; }
.join-panel { padding-top: 55px; padding-bottom: 90px; border-top: 1px solid var(--line); }
.join-panel h2 { font-size: 35px; letter-spacing: -.035em; font-weight: 550; margin: 20px 0; }
.join-panel p { color: var(--muted); font-size: 14px; line-height: 1.95; }
@media (min-width: 1550px) {
  .hero-copy { padding-left: 55px; }
  .home-hero { min-height: 820px; }
}
@media (max-width: 1120px) {
  :root { --content-pad: var(--page-pad); }
  .brand-tagline { display: none; }
  .site-nav { gap: 24px; }
  .site-nav a { font-size: 12px; }
  .home-hero { grid-template-columns: minmax(340px, 1fr) 1fr; }
  .hero-copy { padding-left: 0; }
  .hero-copy h1 { font-size: 56px; }
  .latest-note { grid-template-columns: 160px minmax(0, 1fr) 15px; gap: 15px; }
  .latest-all { display: none; }
  .latest-strip { grid-template-columns: 1fr; }
  .site-footer { gap: 25px; grid-template-columns: 1fr 1fr; }
  .copyright { grid-column: 1 / -1; }
  .digest-card { grid-template-columns: 130px minmax(0, 1fr) 90px; gap: 25px; }
  .about-grid { gap: 55px; }
}
@media (max-width: 820px) {
  :root { --header-height: 76px; }
  body.menu-is-open { overflow: hidden; }
  .site-header { height: var(--header-height); padding: 0 var(--page-pad); }
  .brand-name { font-size: 25px; }
  .brand img { width: 36px; height: 36px; }
  .menu-toggle { display: grid; gap: 6px; z-index: 22; position: relative; background: transparent; border: 0; padding: 12px 0 12px 12px; }
  .menu-toggle span { width: 24px; height: 1px; background: var(--ink); transition: transform .18s; }
  .menu-toggle[aria-expanded=true] span:first-child { transform: translateY(3.5px) rotate(45deg); }
  .menu-toggle[aria-expanded=true] span:last-child { transform: translateY(-3.5px) rotate(-45deg); }
  .site-nav { display: none; position: fixed; inset: 76px 0 0; background: #fff; padding: 25px var(--page-pad) 50px; flex-direction: column; align-items: start; gap: 0; overflow: auto; }
  .site-nav.is-open { display: flex; }
  .site-nav a { width: 100%; padding: 20px 0; display: flex; align-items: baseline; gap: 18px; border-bottom: 1px solid var(--line); font-size: 22px; }
  .site-nav a small { display: inline; font-size: 10px; }
  .site-nav a:after { display: none; }
  .home-hero { min-height: auto; padding: 118px var(--page-pad) 0; grid-template-columns: 1fr; }
  .hero-copy { padding: 0 0 50px; }
  .hero-copy h1 { font-size: clamp(45px, 7.5vw, 62px); }
  .hero-lede { font-size: 18px; margin-top: 28px; }
  .hero-actions { margin-top: 32px; gap: 30px; }
  .hero-visual { position: relative; width: calc(100% + var(--page-pad)*2); height: min(60vw, 470px); margin-left: calc(var(--page-pad)*-1); }
  .hero-visual:after { background: linear-gradient(180deg, #fff, #ffffff00 18%, #ffffff00 82%, #fff); }
  .hero-visual img { transform: none; object-position: 100% 65%; }
  .page-intro { min-height: auto; padding-top: 75px; padding-bottom: 65px; }
  .page-intro h1 { font-size: 52px; }
  .page-intro>p { margin-left: 0; font-size: 16px; margin-top: 30px; }
  .page-intro.compact h1 { font-size: 43px; }
  .archive-tools { align-items: start; gap: 20px; }
  .filter-tabs { gap: 4px; }
  .filter-tabs button { padding: 8px 12px; font-size: 12px; }
  .search-box { width: 240px; }
  .digest-card { grid-template-columns: 90px minmax(0, 1fr) 30px; gap: 20px; }
  .digest-card h3 { font-size: 22px; }
  .card-bottom>span:first-child { display: none; }
  .reading-layout { display: block; }
  .reading-nav { position: static; display: flex; gap: 24px; overflow: auto; white-space: nowrap; margin-bottom: 35px; }
  .reading-nav b { display: none; }
  .reading-nav a { border: 0; padding: 0 0 10px; }
  .reading-nav a span { margin-right: 8px; }
  .about-grid { grid-template-columns: 1fr; gap: 35px; padding-top: 55px; padding-bottom: 55px; }
  .about-grid h2 br { display: none; }
  .site-footer { grid-template-columns: 1fr; align-items: start; gap: 28px; }
  .copyright { grid-column: 1; }
  .footer-brand .brand-tagline { display: inline; }
}
@media (max-width: 520px) {
  :root { --page-pad: 20px; }
  .brand-name { font-size: 24px; }
  .home-hero { padding-top: 112px; }
  .hero-copy h1 { font-size: clamp(36px, 10.7vw, 49px); line-height: 1.28; letter-spacing: -.055em; }
  .hero-copy .eyebrow { font-size: 9px; }
  .hero-lede { font-size: 16px; margin-top: 26px; }
  .hero-actions { gap: 25px; margin-top: 30px; }
  .button { min-height: 50px; padding: 0 18px; font-size: 13px; gap: 15px; }
  .text-link { font-size: 13px; gap: 12px; }
  .hero-copy { padding-bottom: 32px; }
  .hero-visual { height: 300px; }
  .latest-strip { padding: 22px 0; }
  .latest-note { grid-template-columns: minmax(0, 1fr) 18px; row-gap: 10px; }
  .latest-note>span { grid-column: 1 / -1; }
  .latest-note strong { font-size: 12px; }
  .site-footer { padding-top: 34px; padding-bottom: 34px; }
  .footer-brand .brand-tagline { display: none; }
  .page-intro, .page-intro.compact { min-height: 0; padding-top: 65px; padding-bottom: 50px; }
  .page-intro h1 { font-size: clamp(36px, 10.3vw, 48px); line-height: 1.3; }
  .page-intro>p { font-size: 14px; margin-top: 25px; }
  .page-intro.compact h1 { font-size: 34px; }
  .page-intro.compact .highlight { display: block; }
  .page-intro.compact>p { font-size: 14px; }
  .archive-section { padding-top: 28px; padding-bottom: 55px; }
  .archive-tools { display: block; }
  .filter-tabs { gap: 5px; }
  .filter-tabs button { padding: 9px 14px; }
  .search-box { width: 100%; margin-top: 22px; }
  .digest-card { grid-template-columns: 1fr 24px; padding: 27px 0; column-gap: 12px; }
  .card-top { grid-column: 1; grid-row: 1; flex-direction: row; gap: 20px; margin-bottom: 15px; align-items: center; }
  .digest-card h3 { grid-column: 1; grid-row: 2; font-size: 22px; }
  .digest-card>p { grid-column: 1; font-size: 12px; }
  .tags { grid-column: 1; }
  .card-bottom { grid-column: 2; grid-row: 2; padding-top: 6px; justify-content: start; }
  .archive-cta { align-items: start; gap: 20px; }
  .archive-cta p { font-size: 12px; }
  .reading-top { padding-top: 25px; padding-bottom: 28px; }
  .small-button { font-size: 11px; padding: 8px 10px; }
  .reading-nav { font-size: 11px; gap: 20px; margin-bottom: 23px; }
  .article-header h1 { font-size: 29px; line-height: 1.6; margin: 18px 0; }
  .article-subtitle { font-size: 14px; }
  .source-note { font-size: 11px; padding-left: 13px; }
  .topic-article { padding: 32px 0; }
  .topic-article h2 { font-size: 23px; }
  .topic-article>p { font-size: 14px; }
  .editor-note { padding: 15px 17px; }
  .editor-note p { font-size: 12px; }
  .article-next { font-size: 11px; }
  .button-row { gap: 12px; }
  .button-row .button { padding: 9px 15px; font-size: 11px; }
  .about-grid h2 { font-size: 28px; }
  .about-grid p { font-size: 14px; }
  .principles h3 { font-size: 20px; }
  .join-panel { padding-top: 35px; padding-bottom: 55px; }
  .join-panel h2 { font-size: 27px; }
  .join-panel p { font-size: 13px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *:before, *:after { transition: none !important; }
}
@media print {
  body { background: #fff; }
  body:not(.page-home) main { padding-top: 0; }
  .site-header, .site-footer, .reading-nav, .reading-top, .article-next, .skip { display: none; }
  .wrap { padding: 0; }
  .reading-layout { display: block; max-width: 850px; }
  .article-header h1 { font-size: 28px; }
  .topic-article h2 { font-size: 22px; break-after: avoid; }
  .topic-article>p { font-size: 11px; }
  .editor-note, blockquote { break-inside: avoid; }
  details, details>* { display: block; }
  details summary { display: none; }
  .topic-article { padding: 20px 0; }
  .followups li { font-size: 11px; }
}