@charset "UTF-8";
.reader{background:#fbfcf8}.reader-header{height:76px;display:flex;align-items:center;gap:30px;justify-content:space-between;border-bottom:1px solid var(--line);padding:0 max(28px,calc((100vw - 1240px)/2));position:sticky;top:0;z-index:80;background:#fbfcf8f7;backdrop-filter:blur(12px)}.reader-back{font-size:12px;color:var(--muted);margin-left:auto;min-height:44px;display:flex;align-items:center}.reader-back:hover{color:var(--forest);text-decoration:underline}.reader-count{font-size:11px;color:var(--muted);border-left:1px solid var(--line);padding-left:24px;font-variant-numeric:tabular-nums}.reading-track{position:fixed;left:0;top:75px;width:100%;height:3px;z-index:81;background:transparent}.reading-track i{display:block;height:100%;background:#739447;width:0}.lesson-wrap{max-width:1240px;margin:auto;padding:0 32px}.lesson-hero{padding:56px 0 30px;margin-left:270px;border-bottom:1px solid var(--line)}.lesson-cat{font-size:11px;letter-spacing:.13em;font-weight:700;color:#587346}.lesson-hero h1{font-size:clamp(26px,3vw,38px);letter-spacing:-.035em;line-height:1.6;margin:20px 0 18px;font-weight:750;max-width:850px}.lesson-meta{font-size:11px;color:var(--muted);display:flex;flex-wrap:wrap;gap:12px;margin:0}.reader-layout{display:grid;grid-template-columns:220px minmax(0,1fr);gap:50px;padding-top:36px}.reader-toc{position:sticky;top:104px;align-self:start;max-height:calc(100dvh - 128px);overflow:auto;scrollbar-width:thin;padding:0 12px 20px 0}.reader-toc summary{font-size:12px;font-weight:750;list-style:none;cursor:pointer;padding:9px 0 15px;border-bottom:1px solid var(--line);display:flex;justify-content:space-between}.reader-toc summary::-webkit-details-marker{display:none}.reader-toc summary span{display:none}.reader-toc nav{display:grid;padding:12px 0}.reader-toc nav a{font-size:11px;line-height:1.7;color:var(--muted);padding:9px 10px;border-left:2px solid transparent}.reader-toc nav a:hover,.reader-toc nav a.current{color:var(--forest);background:var(--soft);border-left-color:#749848}.reader-tools{border-top:1px solid var(--line);padding:12px 0;display:grid;justify-items:start}.reader-tools .text-button{font-size:11px;padding:10px 0;text-align:left}.toc-note{font-size:10px;color:var(--muted);line-height:1.9}.article{max-width:850px;min-width:0;font-size:16px;line-height:2.05;color:#30443c;overflow-wrap:anywhere}.article section{margin-bottom:42px}.article h2{font-size:24px;line-height:1.6;letter-spacing:-.025em;margin:46px 0 20px;color:#203d31;padding-bottom:13px;border-bottom:1px solid var(--line);scroll-margin-top:100px}.article h3{font-size:18px;line-height:1.7;margin:30px 0 12px;color:#294637;scroll-margin-top:100px}.article p{margin:0 0 20px}.article ul,.article ol{padding-left:24px;margin:0 0 24px}.article li{padding:5px 0;line-height:1.95}.article strong{font-weight:750;color:#204b37}.article .tip{background:#eff3e8;border-left:3px solid #8da568;padding:20px 24px;margin:24px 0;font-size:14px;line-height:2}.tip>strong{display:block;margin-bottom:8px;font-size:12px;letter-spacing:.05em}.lesson-objective{border:1px solid #dce6d0;background:#f0f5e7;padding:28px 30px;border-radius:8px}.lesson-objective .eyebrow{color:#4d713b;font-size:10px}.lesson-objective p{font-size:17px;line-height:1.85;margin:12px 0 22px;font-weight:600}.learning-flow{display:flex;gap:0;border-top:1px solid #d5dfc6;padding-top:14px}.learning-flow span{font-size:10px;color:#547342;flex:1}.learning-flow span+span:before{content:'→';margin-right:12px;color:#92a87e}.video-status{display:flex;gap:15px;align-items:center;padding:18px 0;margin:0 0 36px;border-block:1px solid var(--line);font-size:12px}.video-status-icon{display:grid;place-items:center;border:1px solid #bccab7;width:36px;height:36px;border-radius:50%;font-size:18px;flex-shrink:0;color:#6f8761}.video-status p{font-size:11px;line-height:1.6;color:var(--muted);margin:3px 0 0}.video-status-tag{margin-left:auto;color:#798977;letter-spacing:.1em;font-size:8px;white-space:nowrap}.video-frame{aspect-ratio:16/9;position:relative;background:#173e34;border-radius:8px;overflow:hidden;margin:24px 0}.video-frame iframe,.video-frame video{position:absolute;inset:0;width:100%;height:100%;border:0}.article .practice-steps{padding:0;list-style:none;border-top:1px solid var(--line)}.practice-steps li{display:flex;gap:18px;padding:20px 0;border-bottom:1px solid var(--line);font-size:15px}.step-count{font-size:18px;line-height:1.8;color:#73904b;font-weight:600;flex-shrink:0}.worked-example{border-left:3px solid #6e8d50;padding:4px 0 4px 24px}.worked-example .eyebrow{color:#638147;font-size:10px}.article .worked-example h2{margin:10px 0 16px;font-size:21px;border:0;padding:0}.worked-example p{font-size:15px;margin-bottom:0}.template-block{border:1px solid #d3dfc8;border-radius:7px;overflow:hidden}.template-bar{display:flex;align-items:center;justify-content:space-between;gap:12px;background:#edf3e5;padding:10px 16px;border-bottom:1px solid #d3dfc8;font-size:11px}.copy-button{min-height:42px;background:white;border:1px solid #ced9c4;border-radius:4px;padding:8px 14px;font-size:11px;color:#345132;line-height:1.5}.copy-button:hover{background:#dfebd2}.worksheet{font-family:var(--font);font-size:14px;line-height:2.1;white-space:pre-wrap;overflow-wrap:anywhere;padding:24px;margin:0;background:#fbfcf8}.assignment{background:#edf3e5;padding:28px 30px;border-radius:8px}.assignment .eyebrow{font-size:10px;color:#62813e}.article .assignment h2{margin:12px 0 18px;border:0;padding:0}.assignment p{font-size:15px}.assignment h3{font-size:15px}.checklist{display:grid;border-top:1px solid #d2dec7}.checklist label{display:flex;gap:12px;align-items:flex-start;padding:15px 0;border-bottom:1px solid #d2dec7;font-size:14px;cursor:pointer;line-height:1.8}.checklist input{width:20px;height:20px;margin:3px 0 0;accent-color:#426638;flex-shrink:0}.article .small-text{font-size:11px;line-height:1.85;color:var(--muted);margin:16px 0 0}.quiz-question{font-weight:650}.answer{border-block:1px solid var(--line)}.answer summary{font-size:13px;padding:18px 0;cursor:pointer;font-weight:600}.answer p{font-size:14px;padding:0 12px 20px;margin:0}.notes-section label{font-size:13px;display:block;margin-bottom:10px}.notes-section textarea{width:100%;max-width:100%;padding:18px;border:1px solid #b8c7af;background:#fff;border-radius:6px;line-height:1.9;resize:vertical;color:var(--ink);font-size:15px}.note-actions{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-top:10px}.note-actions span{font-size:10px;color:var(--muted)}.source-section{padding-top:8px}.source-section p,.source-section li{font-size:12px}.source-section a{text-decoration:underline;text-underline-offset:4px;color:#406438}.completion-area,.lesson-foot-nav,.back-to-list{margin-left:270px}.completion-area{border-top:1px solid var(--line);padding-top:28px}.complete-btn{display:block;width:100%;min-height:56px;padding:14px 20px;border:1px solid #284b3d;background:#204b3a;color:white;border-radius:6px;font-size:14px;font-weight:700}.complete-btn:hover{background:#315b47}.complete-btn.done{background:#e4efd8;color:#34552d;border-color:#bcd0aa}.completion-area p{font-size:11px;text-align:center;color:var(--muted);margin:10px 0 24px}.lesson-foot-nav{display:grid;grid-template-columns:1fr 1fr;gap:16px}.foot-nav-btn{padding:22px 20px;border:1px solid var(--line);border-radius:6px;background:#fff;line-height:1.8}.foot-nav-btn:hover{border-color:#9aae89;background:#f1f5e9}.foot-nav-btn small{font-size:10px;color:var(--muted);display:block;margin-bottom:7px}.foot-nav-btn span{font-size:13px;font-weight:650}.foot-nav-btn.next{text-align:right}.back-to-list{font-size:12px;text-align:center;display:block;padding:30px 0 44px;text-decoration:underline;text-underline-offset:4px}.reader-footer{border-top:1px solid var(--line);max-width:1176px;margin:0 auto;padding:24px 0 32px;font-size:10px;letter-spacing:.12em;color:var(--muted);display:flex;justify-content:space-between}.reader-footer span{font-size:11px;letter-spacing:0}.large-text .article{font-size:19px}.large-text .article p,.large-text .article li{font-size:inherit}.large-text .worksheet,.large-text .checklist label{font-size:17px}.lesson-lock{max-width:780px;margin:40px auto 80px;padding:36px;border:1px solid var(--line);background:#eef3e7;text-align:center;border-radius:8px}.lesson-lock-svg{width:28px;height:28px}.lesson-lock-h{font-size:22px}.lesson-lock-p{font-size:14px;line-height:2;color:var(--muted)}.lesson-lock-actions{display:flex;justify-content:center;flex-wrap:wrap;gap:12px;margin-top:24px}.lesson-lock-btn{background:#214936;color:white;padding:13px 20px;border:1px solid #214936;display:inline-block;border-radius:5px;font-size:13px;min-height:46px;line-height:1.5}.lesson-lock-btn.ghost{background:white;color:var(--forest)}.lesson-admin-bar{background:#fff1cc;font-size:11px;padding:12px 18px;margin-top:20px}.lesson-admin-bar a{text-decoration:underline;margin-left:16px}
@media(max-width:1100px){.lesson-wrap{padding-inline:28px}.reader-layout{grid-template-columns:190px minmax(0,1fr);gap:34px}.lesson-hero,.completion-area,.lesson-foot-nav,.back-to-list{margin-left:224px}.reader-footer{margin-inline:28px}}
@media(max-width:960px){.lesson-wrap{max-width:820px}.lesson-hero,.completion-area,.lesson-foot-nav,.back-to-list{margin-left:0}.lesson-hero{padding-top:36px}.reader-layout{display:block;padding-top:22px}.reader-toc{position:static;max-height:none;padding:0;margin-bottom:28px}.reader-toc summary{padding:15px 18px;border:1px solid var(--line);border-radius:5px;background:#edf3e6;font-size:13px}.reader-toc summary span{display:inline}.reader-toc details[open] summary span{font-size:0}.reader-toc details[open] summary span:after{content:'−';font-size:16px}.reader-toc nav{grid-template-columns:1fr 1fr;border:1px solid var(--line);border-top:0;padding:12px}.reader-toc nav a{padding:12px 10px}.reader-tools{display:flex;gap:20px;border:0;padding:8px 0 0;flex-wrap:wrap}.reader-tools .text-button{font-size:11px}.toc-note{display:none}.reader-header{padding-inline:24px}.reader-footer{max-width:764px;margin:auto;padding-inline:24px}}
@media(max-width:600px){.reader-header{height:66px;padding:0 18px;gap:12px}.reader .brand small{display:none}.reader .brand b{font-size:14px}.reader .brand{gap:8px}.reader .brand-mark{width:33px;height:33px;font-size:13px}.reader-back{font-size:11px}.reader-count{display:none}.reading-track{top:65px}.lesson-wrap{padding-inline:20px}.lesson-hero{padding:30px 0 24px}.lesson-hero h1{font-size:26px;line-height:1.55;margin:15px 0}.lesson-cat{font-size:10px}.lesson-meta{font-size:10px;gap:8px}.reader-toc nav{grid-template-columns:1fr}.reader-tools{gap:16px}.reader-tools .text-button{font-size:10px}.article{font-size:15px;line-height:2}.article h2{font-size:21px;margin-top:36px;scroll-margin-top:84px}.article h3{font-size:17px}.article section{margin-bottom:32px}.lesson-objective{padding:22px 20px}.lesson-objective p{font-size:16px}.learning-flow span{font-size:9px}.learning-flow span+span:before{margin-right:6px}.video-status{gap:10px}.video-status-tag{display:none}.video-status p{font-size:10px}.article .tip{padding:18px 20px;font-size:13px}.practice-steps li{font-size:14px;gap:15px}.worked-example{padding-left:18px}.worked-example p{font-size:14px}.worksheet{font-size:13px;padding:20px}.template-bar{padding:8px 12px}.assignment{padding:22px 20px}.assignment p{font-size:14px}.checklist label{font-size:13px}.notes-section textarea{font-size:16px;padding:15px}.note-actions{align-items:flex-start}.note-actions span{font-size:10px;max-width:55%}.note-actions .copy-button{font-size:10px}.lesson-foot-nav{grid-template-columns:1fr;gap:12px}.foot-nav-btn{padding:18px}.foot-nav-btn.next{background:#eaf2de}.reader-footer{font-size:9px;gap:12px;padding-inline:20px}.reader-footer span{font-size:10px}.lesson-lock{padding:24px 20px}.lesson-lock-h{font-size:20px}.lesson-lock-p{font-size:13px}.lesson-lock-actions{flex-direction:column}.large-text .article{font-size:18px}.large-text .article h2{font-size:23px}}
@media print{.reader-header,.reader-toc,.reading-track,.complete-btn,.lesson-foot-nav,.back-to-list,.reader-footer,.note-actions,.copy-button,.toast,.video-status,.video-frame,.completion-area{display:none!important}.reader-layout{display:block}.lesson-hero{margin:0;padding-top:0}.lesson-wrap{max-width:none;padding:0}.article{max-width:none;font-size:11pt}.article h2{break-after:avoid}.article h3{break-after:avoid}.article section{break-inside:auto}.article p,.article li{orphans:3;widows:3}.answer p{display:block}.lesson-objective,.assignment{background:white;border:1px solid #ddd}body{background:white}}

.video-speed{display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin:-12px 0 32px}.video-speed:before{content:'再生速度';font-size:11px;color:var(--muted);margin-right:4px}.video-speed button{min-height:40px;min-width:64px;padding:6px 14px;border:1px solid #c9d6bf;background:#fff;color:#2f4a3b;border-radius:999px;font-size:13px;font-weight:650;cursor:pointer}.video-speed button[aria-pressed="true"]{background:#204b3a;border-color:#204b3a;color:#fff}.video-speed button:hover{border-color:#8da568}