:root{--paper:#f5f2e9;--ink:#183a30;--muted:#5b645b;--line:#d5d8ca;--green:#234c3d;--pale:#e7ecdf;--gold:#8b5c29;--white:#fffef9;--red:#8d382d;font-family:Arial,'PingFang HK','Noto Sans CJK TC',sans-serif;color:var(--ink);background:var(--paper);font-synthesis:none}*{box-sizing:border-box}body{margin:0}button,input,select,textarea{font:inherit}button,a,input,select,textarea,summary{-webkit-tap-highlight-color:transparent}a{color:inherit;text-underline-offset:4px}button{cursor:pointer}button,a{touch-action:manipulation}button:focus-visible,a:focus-visible,input:focus-visible,textarea:focus-visible,select:focus-visible,summary:focus-visible{outline:3px solid #ac641f;outline-offset:4px}p{line-height:1.78}h1,h2,h3{font-family:Georgia,'Songti TC',serif;font-weight:400;letter-spacing:-.025em;line-height:1.13}h1{font-size:clamp(2.6rem,5.8vw,5.8rem);margin:20px 0 25px}h2{font-size:clamp(1.9rem,3.2vw,3.1rem);margin:0 0 20px}h3{font-size:1.55rem;margin:14px 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25px;max-width:850px}.page-title h1{font-size:clamp(2.5rem,4.5vw,4rem)}.page-title p{color:var(--muted)}.filters{display:flex;gap:15px;align-items:end;flex-wrap:wrap;margin:12px 0 26px}.field{display:flex;flex-direction:column;gap:8px;flex:1;min-width:180px}.field label{font-size:.8rem}input[type=search],select,textarea{padding:13px;border:1px solid #aab5a7;border-radius:6px;background:var(--white);color:var(--ink);width:100%}.count{font-size:.82rem;color:var(--muted);margin-bottom:20px}.lesson-layout{display:grid;grid-template-columns:210px minmax(0,1fr);gap:54px;padding:42px 0}.lesson-sidebar{position:sticky;top:24px;align-self:start;font-size:.8rem}.lesson-sidebar a{display:block;text-decoration:none;padding:10px 0;border-bottom:1px solid var(--line);line-height:1.4}.lesson-sidebar a:hover{text-decoration:underline}.lesson-content{min-width:0;max-width:880px}.lesson-content h1{font-size:clamp(2.4rem,4.5vw,4.1rem);margin-top:16px}.lesson-content 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p{white-space:pre-wrap;overflow-wrap:anywhere}.about{max-width:800px;padding-bottom:40px}.about h2{font-size:1.85rem;margin-top:35px}.about li{line-height:1.75;margin:9px 0}.footer{padding:32px 44px;border-top:1px solid var(--line);display:flex;justify-content:space-between;gap:30px;max-width:1370px;margin:45px auto 0;color:var(--muted);font-size:.75rem}.footer p{max-width:700px;margin:0}.footer a{white-space:nowrap}#storage-alert:not(:empty){background:#f4dfb7;color:#4a321c;padding:13px 44px;font-size:.88rem}dialog{max-width:500px;border:1px solid var(--line);background:var(--paper);color:var(--ink);border-radius:12px;padding:30px}dialog::backdrop{background:#102d26a8}.danger{background:var(--red);border-color:var(--red)}.hidden{display:none!important}.chart-note{color:var(--muted);font-size:.8rem}.shelf{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}.shelf div{border-top:2px solid var(--gold);padding:15px 0}.shelf h3{font-size:1.25rem}.shelf p{font-size:.86rem;color:var(--muted)}[lang=zh-HK] h1{line-height:1.25;letter-spacing:.01em}[lang=zh-HK] h2,[lang=zh-HK] h3{line-height:1.4;letter-spacing:0}.book-tools{display:flex;gap:10px;flex-wrap:wrap;margin:20px 0}.notebook-cover{height:200px;object-fit:cover;object-position:50% 80%;border-radius:10px;margin:20px 0}.readtime{font-size:.76rem;color:var(--muted)}
@media(max-width:1050px){.sitebar{flex-wrap:wrap}.nav{order:3;width:100%;justify-content:space-between}.hero{gap:28px}.hero-art img{height:420px}.wrap{padding:0 30px}.lesson-layout{grid-template-columns:160px minmax(0,1fr);gap:30px}.grid{grid-template-columns:repeat(2,minmax(0,1fr))}.shelf{grid-template-columns:repeat(2,1fr)}}
@media(max-width:650px){.sitebar{padding:18px 20px;gap:17px}.brand strong{font-size:18px}.brand small{font-size:.53rem}.seal{height:36px;width:36px}.language{font-size:.67rem;padding:8px}.nav{gap:12px;flex-wrap:wrap;justify-content:flex-start}.nav a{font-size:.77rem}.wrap{padding:0 21px}.hero{grid-template-columns:1fr;padding:32px 0;gap:24px}.hero h1{font-size:3.2rem;margin:15px 0}.hero p{font-size:.94rem}.hero-art img{height:300px;border-radius:100px 100px 7px 7px}.hero-note{margin-top:16px}.stats{grid-template-columns:repeat(2,1fr);gap:23px}.stat strong{font-size:28px}.section{padding:37px 0}.section-head{align-items:start;flex-direction:column;gap:12px}.grid{grid-template-columns:1fr}.card img{height:180px}.dark-band{grid-template-columns:1fr;padding:27px;gap:8px}.lesson-layout{grid-template-columns:1fr;padding-top:27px;gap:20px}.lesson-sidebar{position:static}.lesson-sidebar nav{display:flex;gap:15px;flex-wrap:wrap}.lesson-sidebar nav a{border:0;padding:3px 0}.lesson-sidebar .progress{display:none}.lesson-content h1{font-size:2.6rem}.lesson-content .lesson-image{max-height:210px}.recall-grid,.two-col{grid-template-columns:1fr}.flow{gap:6px}.flow span{padding:12px 4px;font-size:.73rem}.metrics{grid-template-columns:1fr;gap:8px}.metric{display:flex;align-items:center;justify-content:space-between;gap:15px}.metric strong{margin:0;font-size:25px}.lab-panel{padding:20px}.footer{padding:25px 21px;flex-direction:column;gap:15px}.page-title{padding-top:30px}.case-article .lesson-image{height:205px}.filters .field{min-width:100%}#storage-alert:not(:empty){padding:13px 21px}.shelf{gap:15px}.shelf h3{font-size:1.15rem}.callout{padding:18px}.reading{font-size:.96rem}}
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@media print{header,footer,.lesson-sidebar,.options,.book-tools,.pager,.actions,.skip,#storage-alert{display:none!important}body{background:white;color:black}.wrap{padding:0}.lesson-layout{display:block}.lesson-content{max-width:none}.block{break-inside:avoid}.card{break-inside:avoid}details:not([open])>*{display:block}textarea{border:1px solid #777}a{color:black}.hero-art{max-width:400px}.grid{display:block}.card{margin:15px 0}.chart{max-height:300px}}
figure.hero-art{margin:0}.brand span{min-width:0}.option span{flex-shrink:0}.option{align-items:flex-start}.lesson-content .lead{max-width:700px}
.skip{top:0;clip-path:inset(50%);width:1px;height:1px;padding:0;overflow:hidden;white-space:nowrap}.skip:focus{top:10px;clip-path:none;width:auto;height:auto;padding:12px}
@media(max-width:650px){.chart text{font-size:22px}}

.series-bar{display:flex;justify-content:space-between;gap:1rem;flex-wrap:wrap;padding:1.25rem 0;border-bottom:1px solid #d6dccc;font-size:.85rem}