:root{--ink:#333b36;--muted:#788078;--brand:#426650;--line:#e3e7df;--paper:#fffefb;--reader-size:17px;font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;color:var(--ink);background:#f6f5f0;font-synthesis:none}
*{box-sizing:border-box}body{margin:0}.hidden,[hidden]{display:none!important}button,input,textarea,select{font:inherit}button,a{-webkit-tap-highlight-color:transparent}button{border:0;border-radius:12px;padding:12px 17px;min-height:44px;background:var(--brand);color:white;cursor:pointer;font-weight:600}button:disabled{opacity:.55;cursor:default}button.secondary{color:var(--brand);background:#edf1e9}a{color:var(--brand)}:focus-visible{outline:3px solid #c6a777;outline-offset:3px}.hint{font-size:13px;line-height:1.8;color:var(--muted)}
.course-site-head{max-width:820px;padding:18px 22px;margin:auto;display:flex;align-items:center;justify-content:space-between;gap:12px}.course-brand{display:flex;align-items:center;gap:8px;text-decoration:none;font-size:19px;font-weight:750;color:var(--ink)}.course-brand img{width:32px;height:32px}.course-brand span{font-size:12px;font-weight:400;border-left:1px solid var(--line);padding-left:10px;color:var(--muted)}.course-back{font-size:13px;text-decoration:none;padding:8px 0;white-space:nowrap}.course-page{max-width:760px;margin:auto;padding:12px 22px 64px}.course-intro{padding:25px 0 20px}.eyebrow{font-size:12px;letter-spacing:2px;color:var(--brand);margin:0 0 12px}h1{font-size:29px;line-height:1.5;letter-spacing:-.6px;margin:0 0 12px}.course-intro>p:not(.hint):not(.eyebrow){font-size:19px}#courseStatus{font-size:13px;line-height:1.8;color:var(--muted);margin:12px 0 24px}#courseStatus button{margin:8px 8px 0 0}.course-module{background:var(--paper);border:1px solid var(--line);border-radius:18px;margin:14px 0;padding:22px}.course-module-head{display:flex;gap:12px;align-items:center}.course-module h2{font-size:20px;margin:0}.course-module-no{color:#839480;font-size:12px;letter-spacing:1px}.course-lesson{width:100%;display:flex;align-items:center;justify-content:space-between;gap:16px;color:var(--ink);background:transparent;text-align:left;line-height:1.7;padding:14px 0 0;font-size:15px;font-weight:400}.course-lesson span{color:var(--brand);white-space:nowrap;font-size:13px}.course-module p{margin:7px 0 0}
.reading .course-intro,.reading #courseStatus{display:none}.reading .course-site-head{padding-top:10px;padding-bottom:10px}.reader-tools{position:sticky;top:0;z-index:5;display:flex;justify-content:space-between;align-items:center;gap:8px;padding:10px 0;background:rgba(246,245,240,.97);border-bottom:1px solid var(--line)}.reader-tools button{padding:8px 12px;font-size:13px;min-height:40px}.reader-tools-right{display:flex;gap:6px}.reader-toc{position:sticky;top:61px;z-index:4;background:var(--paper);border:1px solid var(--line);border-radius:12px;padding:12px 16px;font-size:14px;margin:10px 0}.reader-toc summary{cursor:pointer;color:var(--brand);font-weight:600}.reader-toc nav{max-height:48vh;overflow:auto;display:grid;gap:5px;margin-top:12px}.reader-toc button{background:transparent;color:var(--ink);text-align:left;font-weight:400;font-size:14px;padding:8px;line-height:1.6}.reader-toc button.sub{padding-left:22px;color:var(--muted)}.reader-title{padding:28px 0 18px;border-bottom:1px solid var(--line);margin-bottom:24px}.reader-title h1{font-size:27px}.reader-meta{font-size:12px;color:var(--muted);line-height:1.8}
.course-body{font-size:var(--reader-size);line-height:1.95;overflow-wrap:break-word;letter-spacing:.15px}.course-body p{margin:0 0 1.05em}.course-body h2{font-size:1.36em;line-height:1.55;margin:2.1em 0 1em;padding-top:12px;border-top:1px solid var(--line);color:#294634}.course-body h3{font-size:1.15em;line-height:1.7;margin:1.7em 0 .8em;color:#294634}.course-body h4,.course-body h5{font-size:1em;margin:1.4em 0 .7em}.course-body h2,.course-body h3,.course-body h4{scroll-margin-top:122px}.course-body strong{font-weight:650;color:#243e2d}.course-body ul,.course-body ol{padding-left:1.6em;margin:0 0 1.4em}.course-body li{padding-left:.25em;margin:.65em 0}.course-body li::marker{color:#6a876f;font-weight:650}.course-body .course-check{list-style:none;margin-left:-1.2em}.course-prose-block:empty{display:none}.course-prose-block>:last-child{margin-bottom:0}.course-callout{background:#f1f4eb;border:1px solid #e0e7d8;border-left:3px solid #879c75;padding:18px 20px;margin:24px 0;border-radius:3px 12px 12px 3px;font-size:.94em}.course-callout.tone-red{background:#fff5ee;border-color:#efdfd2;border-left-color:#cb916d}.course-callout.tone-blue{background:#f0f5f5;border-color:#dce7e5;border-left-color:#84a19c}.course-callout.tone-purple{background:#f6f2f6;border-color:#e8dfe7;border-left-color:#b49aaf}.course-quote-container{margin:24px 0;padding:4px 20px;border-left:3px solid #b7c4ae;color:#64705f}.course-image{margin:28px 0;text-align:center}.course-image img{display:block;width:100%;max-height:440px;object-fit:contain;background:#fff;border:1px solid var(--line);border-radius:12px;cursor:zoom-in}.course-image img.expanded{max-height:none;cursor:zoom-out}.course-image figcaption{font-size:12px;color:var(--muted);margin:9px 0}.course-lark-table{margin:26px 0}.course-lark-tr{display:grid;grid-auto-flow:column;grid-auto-columns:1fr;gap:18px;padding:18px 0;border-bottom:1px solid var(--line);font-size:.92em}.course-table-head{font-size:13px;font-weight:650;color:var(--brand)}.course-lark-td{min-width:0}.course-cell-label{display:none}.course-lark-td:first-child{font-weight:600}.course-actions{display:flex;gap:12px;padding:26px 0;margin-top:32px;border-top:1px solid var(--line)}.course-actions button{flex:1}
.course-questions{border-top:1px solid var(--line);margin-top:30px;padding-top:30px;scroll-margin-top:74px}.course-questions h2{font-size:22px;margin:0 0 8px}.course-questions textarea,.course-questions select{display:block;width:100%;padding:14px;border:1px solid var(--line);border-radius:12px;background:var(--paper);color:var(--ink);margin:10px 0;line-height:1.7}.course-questions textarea{resize:vertical;min-height:130px}.course-questions label{font-size:14px;line-height:1.7}.course-share{display:flex;gap:8px;align-items:flex-start;margin:14px 0}.course-share input{margin-top:5px;width:16px;height:16px;flex-shrink:0}.question-card{padding:20px 0;border-bottom:1px solid var(--line)}.question-card p{white-space:pre-wrap;overflow-wrap:anywhere;font-size:15px;line-height:1.85;margin:10px 0}.question-meta{font-size:12px;color:var(--muted);line-height:1.7}.question-reply{border-left:3px solid #91a385;padding:12px 15px;background:#f0f4eb;margin-top:15px;border-radius:0 10px 10px 0}.question-reply strong{font-size:13px;color:var(--brand)}.question-status{font-size:13px;color:var(--brand);line-height:1.8;margin:12px 0}.question-empty{font-size:14px;color:var(--muted);padding:16px 0}
@media(max-width:600px){.course-page{padding:0 20px 48px}.course-site-head{padding:16px 20px}.course-brand span{display:none}.course-module{padding:18px}.reader-title h1{font-size:25px}.course-body{line-height:1.9}.course-callout{padding:16px}.course-lark-tr{display:block;padding:17px;background:var(--paper);border:1px solid var(--line);border-radius:12px;margin:12px 0}.course-table-head{display:none}.course-cell-label{display:block;font-size:11px;font-weight:500;color:var(--muted);margin:0 0 5px;letter-spacing:1px}.course-lark-td+.course-lark-td{border-top:1px dashed var(--line);padding-top:12px;margin-top:12px}.course-image img{max-height:390px}.reader-tools{margin:0 -20px;padding:10px 20px}.reader-tools button{padding:8px 10px}.reader-title{padding-top:22px}.course-body h2{font-size:1.27em}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important}}