:root{--blue:#0087DC;--ink:#233b4a;--muted:#567085;--line:#dce6ec}*{box-sizing:border-box}body{margin:0;color:var(--ink);background:#f5f8fa;font-family:Arial,"Noto Sans TC",sans-serif;line-height:1.65}a{color:#006daf}a:hover{text-decoration:underline}button,a{touch-action:manipulation}button{cursor:pointer;font:inherit}button:disabled{cursor:default;opacity:.4}:focus-visible{outline:3px solid #ddac00;outline-offset:3px}.topbar{position:sticky;top:0;z-index:5;background:white;border-bottom:1px solid var(--line);padding:12px 28px;display:flex;gap:22px;align-items:center;min-height:70px}.brand{display:flex;align-items:center;gap:12px;text-decoration:none;font-size:19px;font-weight:700;color:var(--ink)}.brand img{height:35px;width:auto}.toplinks{display:flex;gap:22px;margin-left:auto;align-items:center}.sidebar{position:fixed;top:74px;bottom:0;width:265px;overflow:auto;padding:22px 16px;background:white;border-right:1px solid var(--line)}.sidebar a{display:block;padding:7px 12px;border-left:3px solid transparent;text-decoration:none;font-size:14px}.sidebar a[aria-current=page]{background:#eaf6ff;border-color:var(--blue);font-weight:700}.sidebar summary{cursor:pointer;color:var(--ink);font-weight:bold;padding:12px 4px}.reader{margin-left:265px;padding:26px 36px 60px}.toolbar{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin-bottom:22px}.toolbar button,.button,.pager button{background:white;color:var(--ink);border:1px solid var(--line);padding:9px 16px;border-radius:4px;text-decoration:none;display:inline-block}.toolbar button[aria-pressed=true],.button.primary{background:var(--blue);color:white;border-color:var(--blue)}.page{background:white;padding:28px 30px;margin-bottom:32px;border:1px solid var(--line);scroll-margin-top:85px}.page[hidden]{display:none}.ribbon{display:inline-block;background:var(--blue);color:white;padding:5px 12px;font-size:14px}.page h1{font-size:clamp(24px,2.4vw,35px);line-height:1.3;margin:16px 0}.title-link{color:var(--ink);text-decoration:none}.page-meta{font-size:14px;color:var(--muted);margin-bottom:20px}.steps{display:flex;gap:6px;flex-wrap:wrap;list-style:none;padding:0;font-size:13px}.steps li{padding:3px 9px;background:#f0f6f9}.teaching-row{display:grid;grid-template-columns:minmax(0,3fr) minmax(0,1fr);gap:30px;align-items:start}.copy{min-width:0;font-size:18px}.instruction{margin-bottom:16px}.instruction p{margin:0 0 9px;white-space:pre-wrap;overflow-wrap:anywhere}.label{font-weight:bold;color:#0074bc;margin-top:22px;margin-bottom:8px}.note{font-size:15px;color:var(--muted);border-left:3px solid var(--blue);padding-left:12px}.images{min-width:0}.images figure{margin:0 0 20px}.image-open{display:block;width:100%;border:1px solid var(--line);background:white;padding:0}.image-open img{display:block;width:100%;height:auto}.images figcaption{font-size:12px;color:var(--muted);margin-top:7px;overflow-wrap:anywhere}.source-captions{font-size:14px;color:var(--muted)}.pager{display:flex;align-items:center;justify-content:space-between;gap:15px}.page-source{font-size:12px;border-top:1px solid var(--line);padding-top:15px;margin-top:25px;color:var(--muted)}.table-scroll{overflow:auto}table{border-collapse:collapse;width:100%;font-size:15px;margin:18px 0}td,th{padding:12px;border:1px solid var(--line);text-align:left}tr:first-child{background:#eef6fb}dialog{max-width:96vw;max-height:96vh;padding:0;border:0;background:#152431;color:white;overflow:hidden}dialog::backdrop{background:rgba(0,0,0,.85)}.light-tools{display:flex;gap:12px;align-items:center;padding:10px 16px}.light-tools button{padding:5px 14px}.light-tools button:last-child{margin-left:auto}.light-stage{width:90vw;height:77vh;overflow:auto;display:flex;align-items:flex-start;justify-content:center}.light-stage img{max-width:100%;max-height:100%;object-fit:contain;align-self:center}.light-stage.zoom{display:block}.light-stage.zoom img{max-width:none;max-height:none;width:180%;height:auto}.light-caption{padding:6px 18px;margin:0;font-size:14px}.wrap{max-width:1200px;margin:auto;padding:38px 28px}.hero{margin-bottom:30px}.hero h1{font-size:42px;line-height:1.2;margin:14px 0}.kicker{color:var(--blue);font-weight:bold}.cards{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:22px}.card{background:white;border:1px solid var(--line);padding:24px;border-radius:6px}.card img{width:100%;height:205px;object-fit:contain;background:#f8fbfd}.card h2{font-size:23px}.card-actions{display:flex;gap:10px;flex-wrap:wrap}.card .meta{color:var(--muted);font-size:14px}.download-row{display:flex;gap:12px;flex-wrap:wrap;margin:20px 0}.foot{margin-top:35px;padding:20px 0;border-top:1px solid var(--line);font-size:14px;color:var(--muted)}.menu-toggle{display:none}.skip{position:absolute;top:-60px}.skip:focus{top:3px;z-index:30;background:white;padding:10px}
@media(max-width:850px){.topbar{padding:12px 16px;gap:10px;flex-wrap:wrap}.brand{font-size:15px}.brand img{height:29px}.toplinks{gap:12px;font-size:14px}.sidebar{position:static;width:auto;max-height:45vh;display:none;border-bottom:1px solid var(--line)}.sidebar.open{display:block}.reader{margin:0;padding:18px 14px}.menu-toggle{display:inline-block}.page{padding:20px 18px}.teaching-row{grid-template-columns:1fr;gap:16px}.copy{font-size:17px}.images{display:grid;grid-template-columns:1fr;gap:12px}.images figure{max-width:100%;width:100%}.cards{grid-template-columns:1fr}.hero h1{font-size:32px}.wrap{padding:28px 18px}.light-stage{width:94vw;height:73vh}}

.toolbar{position:sticky;top:70px;z-index:4;background:#f5f8fa;padding:10px 0;border-bottom:1px solid var(--line)}.page{scroll-margin-top:145px}@media(max-width:850px){.toolbar{top:96px}.page{scroll-margin-top:250px}}