:root{color-scheme:light;--ink:#243b37;--muted:#62736d;--green:#007e70;--line:#dce5df;--paper:#f8f9f5;--mint:#e2f3ec;--gold:#fcf0c9;font-family:"Microsoft YaHei","PingFang SC",system-ui,sans-serif;color:var(--ink);background:var(--paper);font-synthesis:none}
*{box-sizing:border-box}body{margin:0}a{color:inherit;text-decoration:none}img{display:block;max-width:100%;height:auto}button,a{-webkit-tap-highlight-color:transparent}a:focus-visible,[tabindex]:focus-visible{outline:3px solid var(--green);outline-offset:5px;border-radius:4px}a:hover{color:var(--green)}.wrap{width:min(1120px,calc(100% - 64px));margin-inline:auto}.skip-link{position:absolute;top:-90px;left:20px;z-index:100;background:white;padding:12px}.skip-link:focus{top:12px}.guide-header{display:flex;align-items:center;justify-content:space-between;gap:24px;padding:20px 0;border-bottom:1px solid var(--line)}.guide-logo{width:168px;height:56px;object-fit:contain}.guide-header nav{display:flex;align-items:center;gap:30px;font-size:15px}.guide-header nav a{padding:12px 0}.guide-header .active{color:var(--green);box-shadow:0 2px var(--green)}.eyebrow{color:var(--green);font-size:14px;font-weight:600;letter-spacing:1px;margin:0 0 18px}.guide-intro{padding:58px 0 32px;position:relative}.guide-intro h1{font-size:clamp(36px,4.7vw,58px);line-height:1.24;letter-spacing:-1.4px;margin:0;font-weight:650}.mint-dot{color:#13aa8f}.intro-copy{position:absolute;bottom:34px;right:0;max-width:430px;font-size:17px;line-height:1.9;color:var(--muted);margin:0}.featured-guide{display:grid;grid-template-columns:1fr 1fr;border-radius:22px;overflow:hidden;background:var(--mint);border:1px solid #d1e6db;min-height:310px}.featured-copy{padding:36px 40px}.featured-copy h2{font-size:clamp(27px,3vw,36px);line-height:1.42;margin:0 0 14px;font-weight:650;letter-spacing:-.5px}.featured-copy>p{font-size:16px;line-height:1.9;color:#526c60}.button{display:inline-flex;align-items:center;justify-content:center;gap:18px;padding:13px 19px;background:var(--green);color:white;border:1px solid var(--green);border-radius:9px;font-size:15px;font-weight:600;line-height:1.5}.button:hover{background:#006659;color:white}.button.secondary{color:var(--green);background:white;border-color:#bad5c8}.button.secondary:hover{background:var(--mint)}.featured-guide figure{margin:0;position:relative;min-height:290px}.featured-guide figure img{width:100%;height:100%;object-fit:cover;position:absolute;inset:0}.featured-guide figcaption{position:absolute;left:18px;bottom:16px;padding:8px 12px;background:#173d31d9;color:#fff;font-size:12px;border-radius:7px}.category-nav{display:flex;align-items:center;flex-wrap:wrap;gap:10px;padding:28px 0;border-bottom:1px solid var(--line);font-size:14px}.category-nav>span{margin-right:auto;color:var(--muted)}.category-nav a{background:#fff;border:1px solid var(--line);border-radius:30px;padding:10px 14px;display:flex;gap:18px}.category-nav a:hover{background:var(--mint)}.guide-group{padding-top:38px;scroll-margin-top:22px}.group-heading{display:flex;justify-content:space-between;align-items:baseline;gap:18px;margin-bottom:18px}.group-heading h2{font-size:24px;margin:0;font-weight:650}.group-heading p{font-size:14px;color:var(--muted);margin:0;line-height:1.7}.guide-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}.guide-card{display:flex;flex-direction:column;padding:24px;background:#fff;border:1px solid var(--line);border-radius:14px}.guide-card:hover{border-color:#b3cfc0}.card-category{font-size:12px;color:var(--green);margin-bottom:14px}.guide-card h3{font-size:19px;line-height:1.7;margin:0 0 12px;font-weight:650}.guide-card p{font-size:14px;line-height:1.9;color:var(--muted);margin:0 0 24px}.read-link{display:flex;justify-content:space-between;gap:12px;margin-top:auto;color:var(--green);font-size:14px}.quiet-invite{margin:44px 0 22px;padding:28px 32px;border-radius:16px;background:var(--gold);display:flex;align-items:center;justify-content:space-between;gap:24px}.quiet-invite h2{margin:0;font-size:24px;font-weight:650}.quiet-invite p{font-size:15px;color:#71694a;margin-bottom:0}.quiet-invite .button{flex-shrink:0}.guide-footer{padding:28px 0 32px;border-top:1px solid var(--line);margin-top:38px;display:flex;justify-content:space-between;gap:22px;color:var(--muted);font-size:13px}.guide-footer>div,.guide-footer nav{display:flex;flex-wrap:wrap;gap:22px}.breadcrumbs{display:flex;flex-wrap:wrap;gap:12px;padding:28px 0;font-size:13px;color:var(--muted)}.article-header{max-width:850px;padding:20px 0 36px}.article-header h1{font-size:clamp(30px,3.6vw,44px);line-height:1.5;margin:0 0 20px;letter-spacing:-.6px;font-weight:650}.article-meta{font-size:13px;color:var(--muted);display:flex;flex-wrap:wrap;gap:20px}.article-lead{font-size:19px;line-height:1.95;margin:26px 0 0;color:#3c6153}.article-layout{display:grid;grid-template-columns:240px minmax(0,1fr);gap:60px;align-items:start;border-top:1px solid var(--line);padding-top:34px}.article-toc{position:sticky;top:24px}.toc-label{font-size:13px;font-weight:600;color:var(--muted)}.article-toc ol{list-style:none;padding:0;margin:16px 0 22px;counter-reset:toc}.article-toc li{counter-increment:toc;display:flex;gap:10px;font-size:14px;line-height:1.85;padding:10px 0}.article-toc li::before{content:counter(toc,decimal-leading-zero);color:#789383;font-size:12px;padding-top:2px}.toc-practice{font-size:14px;color:var(--green)}.article-body{min-width:0;max-width:800px}.article-section{scroll-margin-top:25px;margin:0 0 42px}.article-section h2{font-size:25px;line-height:1.6;margin:0 0 20px;font-weight:650;display:flex;gap:14px;align-items:baseline}.article-section h2>span{font-size:14px;letter-spacing:1px;color:var(--green);font-weight:500}.article-section>p{font-size:17px;line-height:2.05;margin:18px 0;color:#40564e}.sentence-example{margin:22px 0;padding:22px 26px;background:var(--mint);border-left:3px solid #46bca2;border-radius:0 12px 12px 0}.sentence-example figcaption{font-size:12px;color:#3f7060;line-height:1.7}.sentence-example blockquote{margin:12px 0 0}.sentence-example p{font-size:16px;line-height:1.8;margin:6px 0}.sentence-example p[lang=en]{font-size:24px;font-weight:650;line-height:1.6;color:#145446}.practice-steps{list-style:none;counter-reset:steps;margin:20px 0;padding:0}.practice-steps li{counter-increment:steps;display:flex;align-items:baseline;gap:14px;font-size:17px;line-height:1.95;padding:14px 0;border-bottom:1px solid var(--line)}.practice-steps li::before{content:counter(steps);display:grid;place-items:center;flex:0 0 28px;height:28px;background:var(--gold);border-radius:50%;font-size:13px;color:#75612b}.table-scroll{max-width:100%;overflow:auto;margin:22px 0;border:1px solid var(--line);border-radius:12px;background:#fff}table{border-collapse:collapse;width:100%;min-width:410px;font-size:15px;line-height:1.85}th,td{text-align:left;vertical-align:top;padding:14px 16px;border-bottom:1px solid var(--line)}thead{background:#edf3ec}thead th{font-weight:600}tbody th{font-weight:500;min-width:130px;color:#315c4b}tbody tr:last-child>*{border-bottom:0}.small-note{padding:16px 20px;background:#fbf3de;border-radius:10px;font-size:15px;line-height:1.9;color:#736244}.try-course{background:#fff;border:1px solid var(--line);border-radius:16px;overflow:hidden;scroll-margin-top:20px}.try-course>img{width:100%;max-height:280px;object-fit:cover}.try-course>div{padding:26px}.try-course h2{font-size:24px;line-height:1.6;margin:0}.try-course p:not(.eyebrow){font-size:14px;color:var(--muted);line-height:1.8;margin:12px 0 22px}.course-detail-link{display:inline-block;margin:14px 0 0 20px;font-size:14px;text-decoration:underline;text-underline-offset:4px;color:var(--green)}.editorial-note{color:var(--muted);font-size:12px;line-height:1.9;margin:18px 0 0}.related-guides{margin:54px 0 0;padding-top:32px;border-top:1px solid var(--line)}.related-guides>.group-heading>a{color:var(--green);font-size:14px;white-space:nowrap}
@media(max-width:1000px){.intro-copy{position:static;margin-top:22px}.guide-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.article-layout{grid-template-columns:190px minmax(0,1fr);gap:28px}.featured-copy{padding:28px}.group-heading{align-items:flex-start;flex-direction:column;gap:10px}.featured-copy h2{font-size:29px}}
@media(max-width:700px){.wrap{width:calc(100% - 32px)}.guide-header{gap:12px;padding:14px 0}.guide-logo{width:117px;height:39px}.guide-header nav{gap:14px;font-size:13px}.guide-header nav a{padding:10px 0}.guide-intro{padding:32px 0 24px}.guide-intro h1{font-size:39px}.intro-copy{font-size:15px;line-height:1.9}.featured-guide{grid-template-columns:1fr}.featured-copy{padding:26px}.featured-copy h2{font-size:29px}.featured-copy>p{font-size:15px}.featured-guide figure{min-height:195px;order:-1}.desktop-break{display:none}.category-nav{gap:8px;padding:22px 0}.category-nav>span{flex-basis:100%;margin-bottom:6px}.category-nav a{padding:9px 10px;gap:8px;font-size:12px}.guide-group{padding-top:28px}.guide-grid{grid-template-columns:1fr;gap:12px}.guide-card{padding:22px}.guide-card h3{font-size:19px}.quiet-invite{align-items:flex-start;flex-direction:column;padding:26px 24px;gap:20px}.quiet-invite h2{font-size:22px}.guide-footer{flex-direction:column;font-size:12px;gap:18px}.guide-footer>div,.guide-footer nav{gap:18px}.breadcrumbs{font-size:12px;gap:9px;padding:22px 0}.article-header{padding:6px 0 26px}.article-header h1{font-size:29px;line-height:1.5}.article-meta{gap:8px 14px;font-size:12px}.article-lead{font-size:17px;line-height:1.95;margin-top:20px}.article-layout{grid-template-columns:1fr;gap:26px;padding-top:24px}.article-toc{position:static;background:#eef3eb;border-radius:12px;padding:20px}.article-toc ol{margin:8px 0 12px}.article-toc li{padding:6px 0}.article-section{margin-bottom:32px}.article-section h2{font-size:22px;gap:10px}.article-section>p,.practice-steps li{font-size:17px;line-height:1.95}.sentence-example{padding:19px 20px}.sentence-example p[lang=en]{font-size:22px}.try-course>div{padding:22px}.try-course h2{font-size:22px}.course-detail-link{margin-left:0;display:block}.related-guides{margin-top:36px}.group-heading h2{font-size:23px}.related-guides>.group-heading{flex-direction:row;align-items:baseline}}
.article-header h1,.guide-card h3{text-wrap:balance}
@media(max-width:700px){
  .table-scroll table{min-width:0}
  .table-scroll thead{position:absolute;width:1px;height:1px;padding:0;overflow:hidden;clip-path:inset(50%);white-space:nowrap}
  .table-scroll tbody,.table-scroll tbody tr{display:block}
  .table-scroll tbody tr{padding-bottom:12px;border-bottom:1px solid var(--line)}
  .table-scroll tbody tr:last-child{border-bottom:0}
  .table-scroll tbody th{display:block;border:0;background:#edf3ec;padding:12px 16px;font-weight:600}
  .table-scroll td{display:grid;grid-template-columns:5em minmax(0,1fr);gap:12px;padding:12px 16px 0;border:0}
  .table-scroll td::before{content:attr(data-label);color:var(--muted);font-size:13px;padding-top:2px}
}
@media(prefers-reduced-motion:no-preference){html{scroll-behavior:smooth}}