:root{color-scheme:light;--ink:#17251f;--green:#173d2a;--paper:#f3efe5;--card:#fff;--line:#d9d0bf;--muted:#59665f;--accent:#7a4d24}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--paper);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;line-height:1.8}
a{color:var(--green)}.wrap{width:min(960px,calc(100% - 32px));margin:auto}.skip-link{position:absolute;left:-9999px}.skip-link:focus{left:12px;top:12px;z-index:100;background:#fff;padding:8px}
.site-header{position:sticky;top:0;z-index:10;background:#f3efe5ee;backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}.nav{min-height:66px;display:flex;align-items:center;justify-content:space-between;gap:20px}.brand{text-decoration:none;font-weight:800}.nav-links{display:flex;gap:18px;font-size:14px}.nav-links a{text-decoration:none}
.review-banner{background:#fff2cc;color:#694b00;text-align:center;padding:8px 16px;font-size:13px;border-bottom:1px solid #e8d58f}.article-shell{padding:64px 0 80px}.article-head{padding-bottom:36px;border-bottom:1px solid var(--line)}.eyebrow{color:var(--accent);font-weight:800;letter-spacing:.06em}.article-head h1{font-family:"Songti SC","STSong",serif;font-size:clamp(36px,6vw,64px);line-height:1.16;margin:12px 0 20px}.summary{font-size:20px;color:var(--muted);max-width:800px}.byline{font-size:14px;color:var(--muted)}
.article-content,.content-section{font-size:17px}.content-section{padding:34px 0;border-bottom:1px solid var(--line)}h2,h3{font-family:"Songti SC","STSong",serif}h2{font-size:30px;line-height:1.3;margin:0 0 16px}h3{font-size:22px;margin:28px 0 8px}.practice{margin:34px 0;padding:30px;border-radius:18px;background:#e8efe9;border:1px solid #c7d7ca}.practice h2{color:var(--green)}blockquote{margin:20px 0;padding:12px 18px;border-left:4px solid var(--green);background:#fff;color:var(--muted)}code{background:#ebe7dd;padding:2px 5px;border-radius:4px}.table-wrap{overflow:auto}table{border-collapse:collapse;width:100%;background:#fff}th,td{text-align:left;padding:10px;border-bottom:1px solid var(--line)}
.review-note{margin:36px 0;padding:24px;border:1px dashed #a48a5f;background:#fffaf0;border-radius:16px}.review-note h2{font-size:22px}.faq-item{background:#fff;border:1px solid var(--line);border-radius:12px;padding:14px 16px;margin:10px 0}.faq-item h3{margin:0 0 6px}.faq-item p{margin:0}.related ul{columns:2}.course-card{margin:42px 0;padding:28px;background:var(--green);color:#fff;border-radius:22px;display:flex;align-items:center;justify-content:space-between;gap:24px}.course-card h2{margin-bottom:6px}.course-card p{margin:0;color:#dce8e0}.button{display:inline-flex;white-space:nowrap;padding:13px 18px;border-radius:10px;background:#fff;color:var(--green);font-weight:800;text-decoration:none}.article-pager{display:flex;justify-content:space-between;gap:24px;padding:28px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}.article-pager a{max-width:46%}.article-author{padding-top:26px;display:flex;justify-content:space-between;color:var(--muted)}
@media(max-width:720px){.wrap{width:min(100% - 24px,960px)}.nav-links{display:none}.article-shell{padding-top:42px}.article-head h1{font-size:38px}.summary{font-size:18px}.content-section{padding:28px 0}.practice{padding:22px}.related ul{columns:1}.course-card{align-items:flex-start;flex-direction:column}.article-pager{flex-direction:column}.article-pager a{max-width:100%}.article-author{flex-direction:column}.review-banner{font-size:12px}}