:root{--ink:#122c32;--text:#294148;--muted:#687b80;--teal:#116e68;--accent:#d3efa6;--paper:#fffefa;--bg:#f5f6f2;--line:#dce2dc;--soft:#eaf2ed;--nav:278px;--rail:218px}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:96px}body{margin:0;background:var(--paper);color:var(--text);font:16px/1.85 -apple-system,BlinkMacSystemFont,"PingFang TC","Noto Sans TC",sans-serif}button,input{font:inherit}button,a,input{ -webkit-tap-highlight-color:transparent}button,a{touch-action:manipulation}a{color:var(--teal);text-decoration-thickness:1px;text-underline-offset:4px}button{cursor:pointer}button:focus-visible,a:focus-visible,input:focus-visible{outline:3px solid #ba7a22;outline-offset:4px}button{border:1px solid var(--line);background:white;border-radius:5px;padding:9px 16px;color:var(--ink)}button:hover{border-color:var(--teal)}.skip{position:fixed;top:-100px;left:20px;z-index:100;background:white;padding:12px}.skip:focus{top:10px}.topbar{height:80px;position:sticky;top:0;z-index:30;background:var(--ink);color:white;display:flex;justify-content:space-between;align-items:center;padding:0 30px}.brand{color:white;text-decoration:none;display:flex;gap:13px;align-items:center;font-weight:700;font-size:18px;line-height:1.4}.brand-symbol{height:39px;width:39px;background:var(--accent);color:var(--ink);display:flex;align-items:center;justify-content:center;font-size:25px;letter-spacing:-4px;border-radius:3px;padding-right:4px}.brand-symbol span{font-size:18px}.brand-sub{display:block;font-size:12px;letter-spacing:1.8px;font-weight:400;color:#c6d5d3}.top-links{display:flex;gap:25px;align-items:center;font-size:13px}.top-links a{color:#e9f2dc;text-decoration:none}.edition{color:#b7c8c5;letter-spacing:.5px}.top-links button{display:none;background:transparent;color:white;border-color:#63807d}.layout{display:grid;grid-template-columns:var(--nav) minmax(0,1fr) var(--rail);max-width:1600px;margin:auto;align-items:start}.sidebar{position:sticky;top:80px;height:calc(100vh - 80px);overflow:auto;padding:29px 22px;background:var(--bg);border-right:1px solid var(--line);scrollbar-width:thin}.search-wrap label{display:block;font-size:11px;letter-spacing:1px;font-weight:600;margin-bottom:6px;color:var(--muted)}.search-field{display:flex;background:white;border:1px solid #cfd8d1;border-radius:5px;align-items:center;padding:5px 10px;gap:6px}.search-field span{font-size:22px}.search-field input{width:100%;min-width:0;background:transparent;border:0;padding:4px;font-size:14px;color:var(--ink)}.overview-link{display:flex;justify-content:space-between;text-decoration:none;color:var(--ink);font-size:14px;padding:17px 9px 12px;border-bottom:1px solid var(--line);margin-bottom:17px}.nav-group{font-size:11px;color:var(--muted);font-weight:600;letter-spacing:2px;margin:18px 9px 8px}.nav-link{display:flex;align-items:flex-start;gap:10px;padding:8px 9px;text-decoration:none;color:#455b5e;font-size:13px;line-height:1.5;border-radius:4px;margin-bottom:3px}.nav-link:hover{background:#e6ede6}.nav-link[aria-current=page]{background:#dfece1;color:#145e4b;font-weight:650}.nav-number{font-variant-numeric:tabular-nums;color:#6a8076;font-size:11px;padding-top:2px;min-width:18px}.done-dot{margin-left:auto;color:var(--teal)}.progress{border-top:1px solid var(--line);margin-top:24px;padding-top:17px;font-size:12px}.progress>div{display:flex;justify-content:space-between}.progress progress{width:100%;height:5px;display:block;margin:10px 0;appearance:none;border:0;background:#d9e3d9}.progress progress::-webkit-progress-bar{background:#d9e3d9}.progress progress::-webkit-progress-value{background:var(--teal)}.progress small{display:block;color:var(--muted);font-size:11px}.download-mini{font-size:12px;display:block;margin-top:15px;text-decoration:none}main{min-width:0;padding:44px clamp(24px,4vw,68px) 0}main:focus{outline:0}.outline{position:sticky;top:80px;padding:37px 20px;height:calc(100vh - 80px);overflow:auto;border-left:1px solid var(--line);font-size:12px}.outline>p{font-size:11px;color:var(--muted);letter-spacing:2px;margin:0 0 16px}.outline a{display:block;color:#58706f;text-decoration:none;padding:7px 0;line-height:1.55}.outline a:hover{color:var(--teal)}.outline .toc-sub{padding-left:11px;font-size:11px}.outline-note{font-size:11px;line-height:1.9;color:var(--muted);padding-top:20px;margin-top:24px;border-top:1px solid var(--line)}.eyebrow{font-size:11px;font-weight:650;letter-spacing:2px;color:var(--teal);margin:0 0 16px}.hero h1{font-size:clamp(32px,3vw,48px);line-height:1.4;letter-spacing:-1px;margin:0 0 20px;color:var(--ink);font-weight:750}.hero h1 span{color:var(--teal)}.lead{font-size:17px;line-height:1.95;max-width:680px;color:#536b6d}.hero{padding-bottom:31px;border-bottom:1px solid var(--line)}.actions{display:flex;flex-wrap:wrap;gap:12px;margin:23px 0 8px;align-items:center}.primary,.secondary{display:inline-block;padding:10px 18px;border-radius:4px;text-decoration:none;font-size:14px;line-height:1.7}.primary{background:var(--teal);color:white;border-color:var(--teal)}.primary:hover{background:#0e5954}.secondary{border:1px solid var(--line);color:var(--ink);background:white}.facts{display:flex;gap:26px;font-size:12px;color:var(--muted);margin:23px 0 0}.facts b{color:var(--ink);font-size:20px;margin-right:5px;font-weight:600}.section-heading{display:flex;justify-content:space-between;gap:16px;align-items:center;margin:36px 0 17px}.section-heading h2{margin:0;font-size:23px;color:var(--ink)}.section-heading span{font-size:12px;color:var(--muted)}.route{display:grid;grid-template-columns:repeat(4,1fr);border:1px solid var(--line);border-radius:6px;overflow:hidden}.route>div{padding:17px 12px;border-right:1px solid var(--line);line-height:1.6}.route>div:last-child{border:0}.route strong{display:block;color:var(--teal);font-size:12px;margin-bottom:10px}.route b{display:block;font-size:15px}.route small{display:block;font-size:11px;color:var(--muted);margin-top:4px}.note{border-left:3px solid var(--teal);background:var(--soft);padding:16px 20px;margin:22px 0;font-size:14px}.chapter-grid{display:grid;grid-template-columns:1fr 1fr;gap:13px}.chapter-card{padding:20px;border:1px solid var(--line);border-radius:5px;text-decoration:none;color:var(--text);display:block;transition:background .15s}.chapter-card:hover{background:var(--bg);border-color:#9cb9a8}.card-top{font-size:11px;color:var(--teal);display:flex;justify-content:space-between}.chapter-card h3{font-size:18px;line-height:1.5;color:var(--ink);margin:9px 0}.chapter-card p{font-size:13px;line-height:1.8;margin:0;color:#667a7b}.downloads{display:grid;grid-template-columns:1fr 1fr 1fr;gap:12px}.download-card{border:1px solid var(--line);padding:15px;text-decoration:none;line-height:1.7}.download-card b{display:block;font-size:14px}.download-card span{display:block;font-size:11px;color:var(--muted);margin-top:5px}.chapter-header{border-bottom:1px solid var(--line);padding-bottom:27px;margin-bottom:26px}.chapter-header h1{font-size:clamp(30px,3vw,39px);line-height:1.4;color:var(--ink);margin:0 0 13px;letter-spacing:-.8px}.chapter-header .lead{font-size:16px;margin:0}.chapter-meta{display:flex;gap:18px;align-items:center;margin-top:20px;font-size:12px;color:var(--muted)}.chapter-meta span:first-child{background:var(--soft);color:var(--teal);padding:3px 10px;border-radius:3px}.prose{font-size:16px;line-height:1.95;overflow-wrap:break-word}.prose h2{font-size:24px;line-height:1.5;color:var(--ink);margin:43px 0 18px;padding-top:7px;letter-spacing:-.3px}.prose h3{font-size:18px;color:var(--teal);margin:28px 0 10px}.prose p{margin:0 0 18px}.prose li{margin:7px 0}.prose ul,.prose ol{padding-left:25px}.prose strong{color:var(--ink)}.prose blockquote{margin:23px 0;border-left:3px solid var(--teal);background:var(--soft);padding:15px 20px;font-size:14px}.prose blockquote p:last-child{margin:0}code{font-family:ui-monospace,SFMono-Regular,Consolas,monospace;font-size:.85em;background:#edf1eb;padding:2px 5px;border-radius:3px;color:#195753;overflow-wrap:anywhere}.code-wrap{position:relative;margin:22px 0;background:#152f35;border:1px solid #26454b;border-radius:5px;overflow:hidden}.code-toolbar{display:flex;justify-content:space-between;align-items:center;padding:6px 13px;border-bottom:1px solid #2e484e;color:#a8c5c3;font-size:11px;letter-spacing:.5px}.copy-code{border:0;color:#d6eadb;background:transparent;padding:3px 7px;font-size:11px}.prose pre{margin:0;padding:18px;overflow:auto;font-size:13px;line-height:1.8;tab-size:2}.prose pre code{display:block;white-space:pre;background:transparent;color:#e1eee5;padding:0;font-size:inherit;overflow-wrap:normal}.table-wrap{overflow-x:auto;margin:23px 0;border:1px solid var(--line);border-radius:4px}.prose table{border-collapse:collapse;width:100%;font-size:13px;line-height:1.85;min-width:440px}.prose th{background:var(--soft);font-weight:650;color:var(--ink);text-align:left;white-space:nowrap}.prose th,.prose td{padding:12px 13px;border-bottom:1px solid var(--line);vertical-align:top}.prose tr:last-child td{border-bottom:0}.prose td code{font-size:12px}.quiz{margin:40px 0 26px;padding:25px;background:#f1f4ea;border:1px solid #dbe3cf;border-radius:5px}.quiz h2{font-size:21px;margin:0 0 12px;color:var(--ink)}.quiz p{font-size:15px;margin:10px 0}.quiz fieldset{padding:0;border:0;margin:15px 0}.quiz legend{font-size:15px;font-weight:600;margin-bottom:13px}.quiz label{display:flex;gap:10px;padding:10px 12px;background:#fffefa;border:1px solid var(--line);margin-bottom:9px;border-radius:4px;font-size:14px;cursor:pointer;align-items:center}.quiz input{accent-color:var(--teal)}.feedback{padding:12px 0 0;font-size:14px;color:var(--teal)}.feedback:empty{display:none}.finish-line{display:flex;align-items:center;gap:12px;padding:18px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line);font-size:14px}.finish-line input{width:18px;height:18px;accent-color:var(--teal)}.pager{display:flex;justify-content:space-between;gap:20px;margin:25px 0}.pager a{max-width:48%;font-size:14px;text-decoration:none}.pager small{display:block;font-size:11px;color:var(--muted)}.pager a:last-child{text-align:right;margin-left:auto}footer{margin-top:50px;border-top:1px solid var(--line);padding:24px 0 30px;font-size:11px;line-height:1.9;color:var(--muted)}footer span{font-size:10px}.lab{padding:24px;background:#edf3f0;border:1px solid #cbddd2;border-radius:6px;margin:25px 0}.lab .eyebrow{margin:0 0 7px}.lab h2{margin:0 0 12px;font-size:23px;color:var(--ink)}.lab p{font-size:14px;margin:8px 0 15px}.lab-steps{display:flex;gap:5px;flex-wrap:wrap;margin:17px 0}.lab-steps span{padding:6px 10px;border:1px solid #c5d6cf;background:white;border-radius:4px;font-size:12px}.lab-steps .active{background:var(--teal);color:white;border-color:var(--teal)}.lab-result{background:white;border-left:3px solid #629682;padding:16px;font-size:14px;min-height:120px;margin:15px 0}.lab-result b{color:var(--teal);display:block;margin-bottom:6px}.lab-controls{display:flex;gap:10px;flex-wrap:wrap}.cost-fields{display:grid;grid-template-columns:1fr 1fr;gap:14px}.cost-fields label{font-size:12px;display:block}.cost-fields input{display:block;width:100%;border:1px solid #b9ccc1;padding:8px;background:white;border-radius:3px;color:var(--ink)}.cost-total{font-size:30px;font-weight:650;color:var(--teal);margin:16px 0}.cost-total small{font-weight:400;font-size:12px;color:var(--muted)}.search-result{display:block;padding:22px 0;border-bottom:1px solid var(--line);text-decoration:none}.search-result h2{font-size:21px;margin:0 0 5px}.search-result p{font-size:14px;color:#536d6e;margin:0}.search-result small{color:var(--muted);font-size:11px}.toast{position:fixed;bottom:25px;left:50%;transform:translate(-50%,20px);opacity:0;pointer-events:none;z-index:50;background:var(--ink);color:white;padding:10px 18px;border-radius:5px;transition:opacity .2s,transform .2s;font-size:13px}.toast.show{opacity:1;transform:translate(-50%,0)}@media(min-width:1450px){:root{--nav:292px;--rail:242px}.prose{font-size:17px}}@media(max-width:1150px){:root{--nav:245px;--rail:0px}.outline{display:none}main{padding:35px 35px 0}.edition{display:none}}@media(max-width:760px){.topbar{height:70px;padding:0 17px}.brand{font-size:15px;gap:9px}.brand-sub{font-size:10px}.brand-symbol{width:32px;height:32px}.top-links{gap:10px;font-size:11px}.top-links button{display:block;font-size:11px;padding:6px 8px}.layout{display:block}.sidebar{display:none;position:fixed;z-index:25;left:0;top:70px;width:min(340px,90vw);height:calc(100dvh - 70px);box-shadow:8px 12px 20px #122c3222}.sidebar.open{display:block}main{padding:28px 21px 0}.hero h1{font-size:34px}.hero .lead{font-size:15px}.facts{gap:20px;font-size:11px}.facts b{font-size:18px}.route{grid-template-columns:1fr 1fr}.route>div:nth-child(2){border-right:0}.route>div:nth-child(-n+2){border-bottom:1px solid var(--line)}.chapter-grid{grid-template-columns:1fr}.downloads{grid-template-columns:1fr}.download-card{padding:12px 15px}.download-card span{margin-top:2px}.chapter-header h1{font-size:30px}.chapter-meta{gap:12px;flex-wrap:wrap}.prose{font-size:16px}.prose h2{font-size:23px}.section-heading{align-items:flex-start}.section-heading span{font-size:11px;text-align:right}.section-heading h2{font-size:21px}.quiz,.lab{padding:20px 17px}.cost-fields{gap:10px}.code-toolbar{padding:5px 10px}.prose pre{padding:15px;font-size:12px}.pager{gap:15px}.prose li{margin:10px 0}.finish-line{align-items:flex-start}.finish-line input{flex-shrink:0;margin-top:5px}}@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}@media print{.topbar,.sidebar,.outline,.quiz,.lab,.pager,.finish-line,.copy-code{display:none}.layout{display:block}main{padding:0}.prose pre{white-space:pre-wrap}.code-wrap{background:white}.prose pre code{color:black}.chapter-header{break-after:avoid}a{color:inherit}footer{display:none}}

/* Student task cards use prose typography, not a terminal treatment. */
.task-card{background:#f0f6ed;border-color:#b9d1bb;border-left:4px solid #34765b}
.task-card .code-toolbar{color:#245441;border-bottom-color:#cbdcca;letter-spacing:0;font-size:12px;gap:10px}
.task-card .copy-code{color:#245441;background:white;border:1px solid #b9d1bb;white-space:nowrap;font-size:12px}
.prose .task-card pre{padding:18px 20px}
.prose .task-card code{color:#234c3d;white-space:pre-wrap;overflow-wrap:anywhere;font:15px/1.95 -apple-system,BlinkMacSystemFont,"PingFang TC",sans-serif}
@media(max-width:760px){.task-card .code-toolbar{font-size:10px}.prose .task-card pre{padding:15px}.prose .task-card code{font-size:14px}}