:root{color-scheme:light;--ink:#182b41;--muted:#53667c;--accent:#245dd4;--line:#dce4ef;--paper:#fff;--canvas:#f3f6fa;font-family:"Microsoft YaHei","PingFang SC",system-ui,sans-serif;font-size:16px;line-height:1.75}*{box-sizing:border-box}body{margin:0;color:var(--ink);background:var(--canvas)}button,input,a{-webkit-tap-highlight-color:transparent}button,input{font:inherit}a{color:var(--accent);text-decoration:none}a:hover{text-decoration:underline}button{border:1px solid var(--line);background:#fff;color:var(--ink);border-radius:9px;padding:8px 14px;cursor:pointer;transition:background .16s,border-color .16s}button:hover{background:#edf3ff;border-color:#a9bfeb}button:focus-visible,a:focus-visible,input:focus-visible,summary:focus-visible{outline:3px solid #91b3fa;outline-offset:3px}.topbar{height:80px;display:flex;align-items:center;justify-content:space-between;padding:0 32px;background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:10}.brand{display:flex;gap:12px;align-items:center;color:var(--ink);font-weight:700;line-height:1.4}.brand-mark{display:grid;place-items:center;width:43px;height:43px;background:#203c67;color:#fff;border-radius:13px;font-size:23px}.brand-sub{display:block;font-weight:400;color:var(--muted);font-size:12px;margin-top:4px}.top-actions{display:flex;align-items:center;gap:14px}.version{font-size:12px;color:var(--muted)}#menu-toggle{display:none}.layout{display:grid;grid-template-columns:280px minmax(0,1fr);max-width:1500px;margin:auto}aside{position:sticky;top:80px;align-self:start;height:calc(100vh - 80px);overflow:auto;padding:26px 20px;border-right:1px solid var(--line)}aside label{display:block;font-size:13px;font-weight:600;margin-bottom:8px}#search{width:100%;border:1px solid #ccd8e8;background:#fff;border-radius:9px;padding:10px;font-size:14px}#search-status{font-size:12px;color:var(--muted);min-height:20px;margin:8px 0}.nav-group{margin-top:23px}.nav-group h2{font-size:12px;letter-spacing:.06em;color:#697b90;margin:0 0 8px}.nav-item{display:block;font-size:14px;line-height:1.55;color:#3a4e66;padding:10px 12px;border-radius:8px;margin:4px 0;position:relative}.nav-item.active{background:#e5edfc;color:#1e51b2;font-weight:600}.nav-item:hover{background:#eaf0f9;text-decoration:none}.nav-item.completed:after{content:"✓";color:#197950;position:absolute;right:8px;top:9px}.sidebar-note{color:#6b7e91;font-size:12px;margin-top:30px}main{min-width:0;padding:44px 50px 70px;max-width:1160px}h1{font-size:32px;line-height:1.35;letter-spacing:-.02em;margin:10px 0 18px}h2{font-size:23px;line-height:1.5;margin:35px 0 15px}h3{font-size:19px;line-height:1.5;margin:0 0 9px}p{margin:10px 0}.eyebrow{color:var(--accent);font-size:13px;font-weight:600}.lead{color:var(--muted);font-size:17px;margin-bottom:25px}.hero{background:linear-gradient(120deg,#fff,#eaf0fc);border:1px solid #d4deef;padding:35px;border-radius:17px;margin-bottom:28px}.hero h1{max-width:700px}.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:24px}.primary{background:var(--accent);color:#fff!important;border:1px solid var(--accent);border-radius:9px;padding:10px 16px;display:inline-block}.primary:hover{background:#1b4caf;text-decoration:none}.notice{padding:15px 19px;background:#e9eff7;border-left:3px solid #52769f;border-radius:0 9px 9px 0;color:#456078;font-size:14px;margin:23px 0}.callout{background:#fff;border:1px solid var(--line);padding:22px 25px;border-radius:12px;margin:25px 0}.callout h2{margin:0 0 12px;font-size:18px}.cards{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:17px}.card{background:#fff;border:1px solid var(--line);border-radius:13px;padding:25px;display:block;color:var(--ink);transition:transform .16s,box-shadow .16s}.card:hover{transform:translateY(-3px);box-shadow:0 10px 24px #20365512;text-decoration:none}.card h3{font-size:18px}.card p{font-size:14px;color:var(--muted)}.card-number{font-size:13px;font-weight:700;color:var(--accent);margin-bottom:14px}.step{background:#fff;border:1px solid var(--line);border-radius:13px;margin:20px 0;padding:26px}.step-heading{display:flex;align-items:flex-start;gap:14px}.step-number{background:#e8effb;color:#295bb6;flex-shrink:0;width:33px;height:33px;display:grid;place-items:center;border-radius:9px;font-weight:700;font-size:14px}.step p{color:#344b64;line-height:1.95;margin-left:47px}.screenshot{margin:22px 0 0}.screenshot button{display:block;padding:0;width:100%;background:#1b2430;border-radius:10px;overflow:hidden;border:1px solid #2b3c4d}.screenshot img{display:block;width:100%;height:auto}.screenshot figcaption{font-size:12px;color:var(--muted);padding:9px 2px}.example{border:1px solid #ccd8e8;border-radius:12px;background:#edf3fb;padding:21px;margin:20px 0}.example-head{display:flex;justify-content:space-between;align-items:flex-start;gap:14px}.example h3{font-size:16px;margin:3px 0 15px}.example pre{white-space:pre-wrap;overflow-wrap:anywhere;margin:0;font:15px/1.9 "Microsoft YaHei",sans-serif;color:#2b4667}.copy-button{font-size:13px;padding:5px 12px;white-space:nowrap}.table-wrap{overflow-x:auto;background:#fff;border:1px solid var(--line);border-radius:11px}table{border-collapse:collapse;width:100%;font-size:14px;min-width:490px}th,td{text-align:left;padding:14px 18px;border-bottom:1px solid var(--line);vertical-align:top}th{background:#eaf0f8;font-weight:600}tr:last-child td{border-bottom:0}ul{padding-left:22px}li{margin:8px 0}details.faq{border-bottom:1px solid var(--line);padding:16px 2px}details.faq summary{cursor:pointer;font-weight:600}details.faq p{color:var(--muted);padding:6px 0}.video-panel{background:#fff;border:1px solid var(--line);border-radius:13px;padding:22px;margin:26px 0}.video-panel h2{margin:0 0 7px;font-size:18px}.video-panel p{font-size:13px;color:var(--muted)}video{display:block;width:100%;margin-top:16px;max-height:550px;background:#112137;border-radius:9px}.lesson-footer{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:16px;margin-top:45px;padding-top:23px;border-top:1px solid var(--line)}.muted{color:var(--muted);font-size:13px}.home-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.home-list a{display:block;padding:16px 18px;background:#fff;border:1px solid var(--line);border-radius:10px;color:#2c4663;font-size:14px}.home-list a:hover{border-color:#a6bfe9;text-decoration:none}.progress-route{display:flex;gap:8px;flex-wrap:wrap;margin:20px 0}.progress-route span{background:#e6edf8;color:#345173;border-radius:7px;padding:5px 11px;font-size:13px}.downloads a{display:inline-block;margin:6px 20px 6px 0;font-size:14px}dialog{border:0;border-radius:13px;width:min(96vw,1600px);max-height:94vh;padding:15px;background:#f3f6fa}dialog::backdrop{background:#101c2bd9}.dialog-top{display:flex;justify-content:space-between;gap:20px;margin-bottom:12px}dialog img{max-width:100%;display:block;margin:auto}#toast{position:fixed;bottom:26px;left:50%;transform:translateX(-50%);background:#203754;color:#fff;padding:10px 18px;border-radius:9px;opacity:0;pointer-events:none;transition:opacity .2s;z-index:50}#toast.show{opacity:1}.empty-search{font-size:14px;color:var(--muted);padding:15px}.diagram{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:13px;margin:23px 0}.diagram>div{background:#fff;border:1px solid #cbd9ee;border-radius:11px;padding:17px}.diagram b{display:block;font-size:15px}.diagram small{color:var(--muted);font-size:12px}.figure-link{font-size:13px}.search-results{margin-top:25px}.search-results h2{margin-top:0}.badge{display:inline-block;font-size:12px;background:#e8eef8;color:#365781;padding:3px 9px;border-radius:6px;margin-bottom:7px}@media(max-width:1050px){main{padding:32px 28px}.layout{grid-template-columns:240px minmax(0,1fr)}.cards,.home-list{grid-template-columns:1fr}h1{font-size:29px}}@media(max-width:760px){.topbar{padding:0 15px;height:70px}.version{display:none}#menu-toggle{display:inline-block}.brand-sub{font-size:11px}.brand-mark{width:35px;height:35px;font-size:20px}.top-actions{gap:6px}.top-actions button{padding:6px 9px;font-size:12px}.layout{display:block}aside{display:none;position:fixed;top:70px;bottom:0;left:0;width:285px;height:calc(100vh - 70px);background:#f3f6fa;z-index:20;box-shadow:10px 0 30px #172b4220}aside.open{display:block}main{padding:25px 17px 50px}.hero{padding:23px}h1{font-size:27px}h2{font-size:21px}.lead{font-size:15px}.step{padding:19px}.step p{margin-left:0;font-size:15px}.step h3{font-size:17px}.diagram{grid-template-columns:1fr}.example{padding:17px}.example pre{font-size:14px}.example-head{gap:7px}.lesson-footer{align-items:flex-start}dialog{width:96vw;padding:10px}.dialog-top p{font-size:13px}.callout{padding:20px}th,td{padding:12px}.notice{font-size:13px}}@media(prefers-reduced-motion:reduce){*,*::before,*::after{transition:none!important;scroll-behavior:auto!important}}@media print{.topbar,aside,.lesson-footer,.video-panel,.copy-button,#toast{display:none!important}.layout{display:block}main{max-width:none;padding:0}body{background:#fff;font-size:11pt}.step{break-inside:avoid;border:1px solid #ddd}.screenshot img{max-height:450px;object-fit:contain;background:#fff}h1{font-size:24pt}a{color:#000}.notice{border-left:2px solid #999}details.faq p{display:block}.hero{background:#fff}}