:root {
  color-scheme: light;
  --paper: #f7f9fc;
  --white: #fff;
  --ink: #152b49;
  --body: #2c3b50;
  --muted: #647389;
  --line: #dce3ed;
  --blue: #1e5bff;
  --deep-blue: #0d2c6b;
  --sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", system-ui, sans-serif;
  --serif: "Songti SC", "STSong", "Noto Serif CJK SC", Georgia, serif;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--paper); color: var(--ink); font-family: var(--sans); -webkit-font-smoothing: antialiased; }
a { color: inherit; text-decoration: none; }
a:focus-visible { outline: 2px solid var(--blue); outline-offset: 5px; border-radius: 2px; }
::selection { color: var(--deep-blue); background: #dce7ff; }
.shell { width: min(1080px, calc(100% - 64px)); margin-inline: auto; }
.skip-link { position: absolute; top: 12px; left: 16px; padding: 10px 14px; background: var(--white); border: 1px solid var(--blue); z-index: 5; transform: translateY(-180%); }
.skip-link:focus { transform: none; }
.site-header { min-height: 106px; display: flex; align-items: center; justify-content: space-between; gap: 32px; border-bottom: 1px solid var(--line); }
.brand { display: inline-flex; align-items: center; gap: 20px; min-width: 0; }
.brand-logo { display: block; width: 146px; height: auto; flex: none; background: transparent; }
.brand-copy { display: grid; gap: 6px; padding-left: 20px; border-left: 1px solid #cbd6e5; white-space: nowrap; }
.brand-copy > span { font-size: 15px; font-weight: 650; letter-spacing: .12em; }
.brand-copy small { font-size: 10px; color: var(--muted); letter-spacing: .16em; }
.site-header nav { display: flex; gap: 28px; font-size: 13px; white-space: nowrap; color: var(--muted); }
.site-header nav a { padding-block: 12px; }
.site-header nav a[aria-current] { color: var(--deep-blue); text-decoration: underline; text-decoration-color: var(--blue); text-underline-offset: 9px; }
.site-header nav a:hover { color: var(--blue); }
.eyebrow { margin: 0 0 23px; color: var(--muted); font-size: 11px; line-height: 1.5; letter-spacing: .13em; }
.eyebrow-divider { padding-inline: 10px; color: #acb9cb; }
.home-intro { padding: 44px 0 36px; }
h1, h2, h3 { overflow-wrap: anywhere; }
.home-intro h1 { margin: 0; font-size: clamp(30px, 4.2vw, 48px); font-weight: 650; letter-spacing: -.045em; line-height: 1.3; }
.home-lead { margin: 22px 0 0; color: var(--muted); font-size: 16px; line-height: 1.9; }
.reading-list { margin-bottom: 94px; border-top: 1px solid var(--ink); }
.list-heading { padding-block: 18px; display: flex; justify-content: space-between; color: var(--muted); font-size: 11px; letter-spacing: .1em; }
.article-row { display: grid; grid-template-columns: 96px minmax(0, 1fr); padding: 28px 0 30px; border-top: 1px solid var(--line); }
.article-number { padding-top: 3px; color: #8c9ab0; font-family: Georgia, serif; font-size: 17px; font-style: italic; }
.article-entry { min-width: 0; }
.entry-meta { display: flex; flex-wrap: wrap; gap: 16px; color: var(--muted); font-size: 11px; line-height: 1.6; }
.entry-meta span + span::before { content: "·"; margin-right: 16px; color: #a3afbf; }
.article-row h2 { margin: 16px 0; font-size: clamp(22px, 2.6vw, 29px); font-weight: 600; line-height: 1.5; letter-spacing: -.025em; }
.article-row h2 a { display: flex; align-items: baseline; justify-content: space-between; gap: 20px; }
.article-row h2 a:hover { color: var(--blue); }
.row-arrow { color: var(--blue); font: 400 24px/1 var(--sans); flex: none; }
.article-entry > p { max-width: 760px; margin: 0 0 25px; color: var(--muted); font-size: 14px; line-height: 1.95; }
.read-link { display: inline-block; color: var(--deep-blue); font-size: 12px; font-weight: 550; border-bottom: 1px solid #bacbe8; padding-bottom: 4px; }
.read-link:hover { color: var(--blue); border-color: var(--blue); }
.reading-shell { max-width: 760px; margin-inline: auto; padding: 40px 0 70px; }
.back-link { display: inline-block; color: var(--muted); font-size: 12px; line-height: 1.7; }
.back-link:hover { color: var(--blue); }
.reading-header { padding: 52px 0 37px; margin-bottom: 38px; border-bottom: 1px solid var(--line); }
.reading-header h1 { margin: 19px 0 21px; font-size: clamp(30px, 4vw, 43px); line-height: 1.5; letter-spacing: -.04em; font-weight: 650; }
.article-meta { display: flex; flex-wrap: wrap; gap: 8px 18px; color: var(--muted); font-size: 10px; line-height: 1.7; }
.article-meta span { white-space: normal; }
.article-body { color: var(--body); overflow-wrap: anywhere; }
.article-body > p { margin: 0 0 1.65em; font-size: 17px; line-height: 2.05; letter-spacing: .012em; }
.article-body h2 { margin: 2.1em 0 1em; color: var(--ink); font-size: 26px; line-height: 1.55; letter-spacing: -.02em; font-weight: 600; }
.article-body h3 { margin: 1.55em 0 .8em; color: var(--ink); font-size: 20px; line-height: 1.7; font-weight: 600; }
.article-body strong { color: var(--deep-blue); font-weight: 650; }
.article-body a { color: var(--deep-blue); text-decoration: underline; text-decoration-color: #afc3e4; text-underline-offset: 4px; text-decoration-thickness: 1px; }
.article-body a:hover { color: var(--blue); text-decoration-color: var(--blue); }
.article-body blockquote { margin: 34px 0; padding: 3px 0 3px 25px; border-left: 2px solid var(--blue); color: var(--deep-blue); }
.article-body blockquote p { margin: 0; font-size: 19px; line-height: 1.95; }
.article-body ul { padding-left: 1.4em; margin: 0 0 2em; }
.article-body li { padding-left: .35em; margin: .7em 0; font-size: 16px; line-height: 1.9; }
.article-body code { font: .88em/1.6 "SFMono-Regular", Consolas, monospace; background: #edf1f7; padding: .12em .3em; border-radius: 3px; }
.reading-return { margin-top: 65px; padding-top: 25px; border-top: 1px solid var(--line); display: flex; gap: 30px; align-items: flex-start; justify-content: space-between; }
.reading-return > a { color: var(--muted); font-size: 12px; line-height: 1.8; }
.reading-return a:hover { color: var(--blue); }
.next-article { max-width: 55%; display: grid; gap: 8px; text-align: right; }
.next-article small { font-size: 10px; color: var(--muted); }
.next-article span { color: var(--deep-blue); }
.about-shell { max-width: 760px; padding-bottom: 100px; }
.about-shell .reading-header { padding-top: 62px; }
.about-shell .eyebrow { display: none; }
.brand-statement > p { line-height: 2.15; margin-bottom: 1.75em; }
.brand-statement > p:nth-last-child(2) { margin-top: 2.5em; }
.brand-statement > p:last-child { font-size: 21px; line-height: 1.95; }
.site-footer { padding: 30px 0 38px; border-top: 1px solid var(--line); }
.footer-title { display: flex; justify-content: space-between; align-items: center; gap: 16px; font-size: 12px; color: var(--muted); }
.status { font-size: 10px; letter-spacing: .1em; }
.footer-details { display: flex; flex-wrap: wrap; gap: 12px 24px; margin-top: 20px; color: var(--muted); font-size: 10px; line-height: 1.7; }
.footer-details a:hover { color: var(--blue); }
.not-found-content { padding: 100px 0 140px; min-height: 55vh; }
.not-found-content h1 { font-size: clamp(28px, 5vw, 44px); font-weight: 600; }
.not-found-content > p:not(.eyebrow) { margin-bottom: 32px; color: var(--muted); line-height: 1.8; }
.course-entry { display:flex; gap:30px; align-items:center; justify-content:space-between; margin:-35px 0 70px; padding:27px 30px; border:1px solid #d8e3f3; background:#edf3fc; border-radius:5px; }
.course-entry div > span { font-size:10px; color:#657e9e; }
.course-entry h2 { margin:10px 0; font-size:21px; font-weight:600; letter-spacing:-.025em; }
.course-entry h2 a:hover { color:var(--blue); }
.course-entry p { margin:0; color:#617795; font-size:12px; line-height:1.9; }
.course-entry > a { flex:none; }
@media (min-width: 1200px) { .reading-shell { transform: translateX(-12px); } }
@media (max-width: 680px) {
  .shell { width: calc(100% - 40px); }
  .site-header { min-height: 91px; gap: 16px; align-items: center; }
  .brand { gap: 10px; }
  .brand-logo { width: 107px; }
  .brand-copy { border-left: 0; padding-left: 0; gap: 4px; }
  .brand-copy > span { font-size: 11px; letter-spacing: .08em; }
  .brand-copy small { font-size: 8px; letter-spacing: .09em; }
  .site-header nav { gap: 14px; font-size: 11px; }
  .brand-copy { display:none; }
  .course-entry { align-items:flex-start; padding:23px; gap:19px; flex-direction:column; margin:-20px 0 50px; }
  .course-entry h2 { font-size:20px; }
  .home-intro { padding: 34px 0 30px; }
  .home-intro h1 { font-size: clamp(28px, 7.5vw, 36px); }
  .home-lead { font-size: 14px; margin-top: 18px; }
  .eyebrow { font-size: 10px; margin-bottom: 20px; }
  .reading-list { margin-bottom: 64px; }
  .article-row { grid-template-columns: 34px minmax(0, 1fr); padding: 29px 0 33px; }
  .article-number { font-size: 14px; padding-top: 1px; }
  .article-row h2 { font-size: 22px; margin: 12px 0; line-height: 1.65; }
  .article-row h2 a { gap: 10px; }
  .row-arrow { font-size: 18px; }
  .article-entry > p { font-size: 13px; margin-bottom: 20px; }
  .entry-meta { font-size: 10px; gap: 11px; }
  .entry-meta span + span::before { margin-right: 11px; }
  .reading-shell { padding-top: 28px; padding-bottom: 52px; }
  .reading-header { padding: 35px 0 26px; margin-bottom: 31px; }
  .reading-header h1 { font-size: 30px; line-height: 1.55; margin: 15px 0 19px; }
  .article-meta { gap: 6px 14px; }
  .article-body > p { font-size: 16px; line-height: 2; letter-spacing: .005em; margin-bottom: 1.65em; }
  .article-body h2 { font-size: 23px; line-height: 1.6; }
  .article-body h3 { font-size: 18px; }
  .article-body blockquote { padding-left: 18px; }
  .article-body blockquote p { font-size: 17px; }
  .article-body li { font-size: 15px; }
  .reading-return { margin-top: 47px; gap: 20px; }
  .about-shell { padding-bottom: 65px; }
  .about-shell .reading-header { padding-top: 37px; }
  .brand-statement > p:last-child { font-size: 19px; }
  .site-footer { padding: 25px 0 30px; }
  .footer-details { gap: 9px 16px; }
}
@media (max-width: 370px) {
  .shell { width: calc(100% - 32px); }
  .brand-logo { width: 87px; }
  .brand-copy > span { font-size: 10px; }
  .brand-copy small { font-size: 7px; }
  .site-header nav { gap: 10px; font-size: 10px; }
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
@media print {
  body { background: #fff; }
  .site-header, .site-footer, .back-link, .reading-return, .skip-link { display: none; }
  .shell, .reading-shell { width: 100%; max-width: none; padding: 0; transform: none; }
  .reading-header { padding-top: 0; }
  .article-body > p { font-size: 11pt; line-height: 1.8; }
  .article-body h2, .article-body h3 { break-after: avoid; }
}