:root { color-scheme: light; --ink: #233b32; --muted: #5c6f65; --green: #245b45; --line: #dce4dc; --paper: #fbfaf6; --gold: #ad7131; }
* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 26px; }
body { margin: 0; background: var(--paper); color: var(--ink); font-family: "PingFang SC", "Microsoft YaHei", system-ui, sans-serif; line-height: 1.8; overflow-wrap: anywhere; }
a { color: var(--green); text-underline-offset: 4px; }
a:hover { color: #8c4c20; }
a:focus-visible { outline: 3px solid #b57c35; outline-offset: 5px; border-radius: 2px; }
.container { width: min(1120px, calc(100% - 56px)); margin-inline: auto; }
.skip-link { position: fixed; top: -100px; left: 16px; z-index: 5; padding: 10px 18px; background: #fff; }
.skip-link:focus { top: 12px; }
.site-header { background: #fffefb; border-bottom: 1px solid var(--line); }
.header-inner { width: min(1200px, calc(100% - 56px)); min-height: 94px; margin-inline: auto; display: flex; align-items: center; justify-content: space-between; gap: 28px; }
.brand { display: flex; align-items: center; gap: 13px; text-decoration: none; font-size: 23px; font-weight: 700; letter-spacing: 1px; flex-shrink: 0; }
.brand-mark { display: grid; place-items: center; width: 43px; height: 48px; border: 1px solid #72947e; border-radius: 15px 15px 4px 4px; background: #eef3e8; font-family: serif; font-size: 28px; font-weight: 400; }
.brand small { display: block; margin-top: -2px; font-size: 10px; font-weight: 400; letter-spacing: 1px; color: var(--muted); }
.site-header nav { display: flex; align-items: center; flex-wrap: wrap; gap: 27px; font-size: 14px; }
.site-header nav a { text-decoration: none; }
.site-header nav [aria-current] { border-bottom: 1px solid var(--green); }
.nav-trial { padding: 8px 16px; border: 1px solid #9bb2a2; border-radius: 3px; }
.eyebrow { margin: 0 0 16px; color: var(--gold); font-size: 12px; font-weight: 600; letter-spacing: 2px; }
.hub-hero { padding: 74px 0 54px; background: linear-gradient(115deg, #edf2e8, #f5f2e9 75%); border-bottom: 1px solid var(--line); }
.hub-hero h1 { margin: 0 0 25px; font-family: "Noto Serif SC", "Songti SC", SimSun, serif; font-size: clamp(38px, 5.4vw, 62px); line-height: 1.4; font-weight: 500; letter-spacing: 2px; }
.hero-description { max-width: 660px; margin: 0; color: var(--muted); font-size: 17px; line-height: 2; }
.hero-meta { display: flex; flex-wrap: wrap; gap: 10px 24px; margin-top: 31px; color: var(--muted); font-size: 12px; }
.guide-section { padding-block: 58px 66px; }
.section-heading { margin-bottom: 30px; }
.section-heading h2, .course-section h2 { margin: 0 0 14px; font-size: 30px; font-weight: 600; line-height: 1.6; }
.section-heading > p:last-child { margin: 0; color: var(--muted); font-size: 15px; }
.guide-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.guide-card { min-width: 0; padding: 28px 30px; background: #fffefa; border: 1px solid var(--line); border-radius: 5px; }
.card-top { display: flex; gap: 20px; justify-content: space-between; align-items: baseline; }
.guide-number { color: #708b70; font-family: Georgia, serif; font-size: 28px; }
.card-audience { max-width: 75%; text-align: right; color: var(--muted); font-size: 11px; }
.guide-card h2 { margin: 13px 0; font-size: 22px; line-height: 1.7; font-weight: 600; }
.guide-card h2 a { text-decoration: none; }
.guide-card > p { margin: 0 0 20px; color: var(--muted); font-size: 14px; line-height: 1.95; }
.text-link { display: inline-block; font-size: 14px; text-decoration: none; border-bottom: 1px solid #aec0ad; }
.course-section { display: grid; grid-template-columns: minmax(0, 1fr) auto; align-items: center; gap: 54px; margin-bottom: 65px; padding: 40px; background: #edf2e9; border-top: 3px solid #72947e; }
.course-section p:not(.eyebrow) { max-width: 700px; margin-bottom: 0; color: var(--muted); font-size: 14px; line-height: 2; }
.course-actions { display: flex; flex-direction: column; align-items: flex-start; gap: 20px; }
.button { display: inline-block; padding: 11px 22px; background: var(--green); color: #fff; text-decoration: none; font-size: 14px; border-radius: 3px; }
.button:hover { background: #183f30; color: #fff; }
.site-footer { padding: 30px 0; border-top: 1px solid var(--line); background: #f1f2eb; color: var(--muted); }
.footer-inner { width: min(1120px, calc(100% - 56px)); margin-inline: auto; }
.site-footer p { margin: 5px 0; font-size: 13px; }
.site-footer a { display: inline-block; margin: 0 22px 6px 0; text-decoration: none; }
.fine-print, .site-footer .fine-print { color: var(--muted); font-size: 12px; }
.breadcrumbs { display: flex; flex-wrap: wrap; gap: 10px; padding-top: 28px; color: var(--muted); font-size: 12px; }
.breadcrumbs a { text-decoration: none; }
.article-header { padding: 32px 0 34px; border-bottom: 1px solid var(--line); }
.article-header h1 { max-width: 860px; margin: 0 0 20px; font-size: clamp(28px, 4vw, 42px); line-height: 1.6; font-weight: 600; }
.article-description { max-width: 780px; margin: 0; color: var(--muted); font-size: 16px; }
.article-meta { display: flex; flex-wrap: wrap; gap: 8px 22px; margin-top: 24px; color: var(--muted); font-size: 12px; }
.article-layout { display: grid; grid-template-columns: minmax(0, 760px) minmax(0, 250px); gap: 60px; padding-block: 38px 65px; }
.article-body { min-width: 0; font-size: 16px; line-height: 2; }
.article-body p { margin: 16px 0; }
.article-body h2 { margin: 0 0 15px; font-size: 24px; line-height: 1.6; font-weight: 600; }
.answer-box { padding: 25px 28px; background: #eaf0e6; border-left: 3px solid #72947e; }
.answer-box h2 { font-size: 17px; }
.answer-box p:last-child { margin-bottom: 0; }
.article-toc { padding: 25px 0; margin-bottom: 5px; border-bottom: 1px solid var(--line); }
.article-toc p { margin: 0; color: var(--muted); font-size: 13px; }
.article-toc ol { margin: 10px 0 0; padding-left: 24px; font-size: 14px; }
.article-toc a { text-decoration: none; }
.article-section { padding-top: 32px; }
.article-body ul { padding-left: 24px; }
.article-body li { padding-left: 3px; margin-block: 9px; }
.example-box { margin-top: 35px; padding: 25px 28px; background: #f5eddf; border: 1px solid #e8ddca; }
.example-box p:last-child { margin-bottom: 0; }
.example-box .eyebrow { margin-top: 0; font-size: 11px; }
.platform-box { margin-top: 35px; padding-top: 30px; border-top: 1px solid var(--line); }
.platform-box .button { margin-right: 22px; }
.platform-box .eyebrow { margin-top: 0; }
.reading-aside { min-width: 0; }
.aside-sticky { position: sticky; top: 28px; padding-top: 5px; }
.reading-aside h2 { margin: 0 0 15px; font-size: 18px; }
.related-list { margin: 0 0 25px; padding: 0; list-style: none; border-top: 1px solid var(--line); }
.related-list li { border-bottom: 1px solid var(--line); }
.related-list a { display: block; padding: 15px 0; font-size: 14px; text-decoration: none; }
.aside-note { margin-top: 30px; color: var(--muted); font-size: 13px; line-height: 2; }
@media (max-width: 900px) { .article-layout { grid-template-columns: minmax(0, 1fr); gap: 32px; } .reading-aside { border-top: 1px solid var(--line); padding-top: 28px; } .aside-sticky { position: static; } .course-section { grid-template-columns: 1fr; gap: 27px; } .course-actions { flex-direction: row; flex-wrap: wrap; align-items: center; } }
@media (max-width: 600px) { .container, .header-inner, .footer-inner { width: calc(100% - 36px); } .header-inner { padding-block: 17px; flex-wrap: wrap; gap: 17px; } .brand { font-size: 21px; } .brand-mark { width: 37px; height: 42px; font-size: 25px; } .site-header nav { width: 100%; justify-content: space-between; gap: 15px; font-size: 13px; } .nav-trial { padding: 5px 12px; } .hub-hero { padding: 42px 0 34px; } .hub-hero h1 { font-size: 36px; letter-spacing: 0; } .hero-description { font-size: 15px; } .hero-meta { gap: 8px 18px; font-size: 11px; } .guide-section { padding-block: 37px 40px; } .guide-grid { grid-template-columns: 1fr; gap: 15px; } .guide-card { padding: 22px; } .guide-card h2 { font-size: 20px; } .section-heading h2, .course-section h2 { font-size: 25px; } .course-section { padding: 25px; margin-bottom: 40px; } .article-header { padding-block: 25px 27px; } .article-header h1 { font-size: 28px; } .article-description, .article-body { font-size: 15px; } .article-layout { padding-top: 25px; } .answer-box, .example-box { padding: 21px; } .article-body h2 { font-size: 21px; } .answer-box h2 { font-size: 17px; } .article-meta { font-size: 11px; } .platform-box .button { margin-right: 14px; margin-bottom: 14px; } }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
@media print { .site-header, .site-footer, .reading-aside, .article-toc, .platform-box .button, .skip-link { display: none; } body { background: #fff; color: #000; } .container { width: 100%; } .article-layout { display: block; } .article-header h1 { font-size: 26px; } .article-body { font-size: 12pt; } .article-section, .example-box { break-inside: avoid; } }