@import url('https://fonts.googleapis.com/css2?family=DM+Sans:wght@400;500;600;700&family=Manrope:wght@400;500;600;700;800&display=swap');
:root{--ink:#142b36;--muted:#5b6b73;--paper:#f5f7f7;--line:#dce4e6;--teal:#2454dc;--blue:#2454dc;--soft:#edf2ff;--orange:#8e4d19}*{box-sizing:border-box}body{margin:0;color:var(--ink);background:var(--paper);font:16px/1.65 'DM Sans',system-ui,'Microsoft YaHei',sans-serif}h1,h2,h3{font-family:Manrope,system-ui,sans-serif;line-height:1.2;letter-spacing:-.035em}h1{font-size:clamp(32px,4vw,52px);margin:12px 0 20px;max-width:850px}h2{font-size:25px;margin:0 0 18px}h3{font-size:19px;margin:0 0 12px}p{margin:0 0 18px}a{color:var(--blue);text-underline-offset:4px}button,a.btn{cursor:pointer;font:inherit}button{border:1px solid var(--line);background:#fff;color:var(--ink);border-radius:7px;padding:10px 15px}button:hover,a.btn:hover{filter:brightness(.96)}button:focus-visible,a:focus-visible,input:focus-visible,summary:focus-visible{outline:3px solid #f0a341;outline-offset:3px}header{background:#fff;border-bottom:1px solid var(--line);min-height:90px;display:flex;align-items:center;gap:32px;padding:16px 3.5%;position:sticky;top:0;z-index:3}.brand{display:flex;align-items:center;gap:12px;text-decoration:none;color:var(--ink);font-size:24px;font-weight:800;line-height:1.1}.brand-logo{display:block;width:56px;height:56px;object-fit:contain;flex-shrink:0}.brand-sub{color:var(--blue)}.brand-sub{display:block;font-size:12px;letter-spacing:1.1px;margin-top:6px}#top-nav{display:flex;gap:24px;margin-left:auto}#top-nav a{font-size:14px;font-weight:700;color:var(--muted);text-decoration:none;padding:8px 0}#top-nav a.active{color:var(--teal);border-bottom:2px solid var(--teal)}.language{display:flex;border:1px solid var(--line);border-radius:7px;padding:3px}.language button{font-size:13px;border:0;padding:6px 11px}.language button.active{background:var(--ink);color:#fff}.shell{display:grid;grid-template-columns:280px 1fr;max-width:1600px;margin:auto}aside{padding:30px 22px;border-right:1px solid var(--line);height:calc(100vh - 90px);position:sticky;top:90px;overflow:auto}.eyebrow{font-size:12px;font-weight:800;letter-spacing:1.7px;text-transform:uppercase;color:var(--teal)}.phase{font-size:11px;font-weight:800;letter-spacing:1.25px;color:var(--muted);margin:26px 10px 9px}.lesson-link{display:flex;gap:12px;padding:10px;border-radius:7px;text-decoration:none;color:var(--muted);font-size:14px;line-height:1.4;margin:3px 0}.lesson-link.active{background:#e8efff;color:#2148bd;font-weight:700}.lesson-link:hover{background:#edf2ff}.lesson-num{font-size:12px;min-width:23px;font-weight:700;padding-top:2px}.sidebar-top{padding:0 10px}.progress-track{height:5px;background:var(--line);border-radius:5px;margin:10px 0}.progress-track span{display:block;background:var(--teal);height:100%;border-radius:5px}.small{font-size:13px;color:var(--muted)}main{padding:46px clamp(22px,4vw,64px) 70px;min-width:0;max-width:1150px}.lead{font-size:19px;max-width:720px;color:var(--muted)}.hero{border-bottom:1px solid var(--line);padding-bottom:28px;margin-bottom:30px}.meta{display:flex;gap:20px;flex-wrap:wrap;font-size:14px;color:var(--muted);margin:18px 0}.meta span+span{border-left:1px solid var(--line);padding-left:20px}.btn,.primary{display:inline-flex;align-items:center;justify-content:center;gap:12px;padding:11px 18px;border-radius:7px;text-decoration:none;background:var(--ink);color:#fff;border:1px solid var(--ink);font-size:14px;font-weight:700}.btn.secondary{background:#fff;color:var(--ink);border-color:var(--line)}.actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:20px}.grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}.card,.panel{background:#fff;border:1px solid var(--line);border-radius:10px;padding:25px}.card p:last-child{margin-bottom:0}.panel{margin-bottom:22px}.card-number{color:var(--teal);font-size:13px;letter-spacing:1px;margin-bottom:14px;font-weight:800}.card-link{color:inherit;text-decoration:none;display:block}.card-link:hover{border-color:var(--teal)}.notice{border-left:3px solid #c8883b;background:#fff5e6;padding:16px 20px;margin:22px 0;font-size:14px}.rule{border-left:3px solid var(--teal);background:var(--soft);padding:22px;margin:24px 0}.rule .eyebrow{margin-bottom:7px}.video{display:grid;grid-template-columns:52px 1fr;gap:18px;padding:22px;border:1px solid var(--line);border-radius:9px;margin:14px 0;background:#fff}.play{width:48px;height:48px;border-radius:50%;display:grid;place-items:center;background:var(--soft);color:var(--teal)}.video h3{font-size:18px;letter-spacing:-.01em}.video p{font-size:14px;margin-bottom:10px;color:var(--muted)}.video a{font-size:14px;font-weight:700}.label{font-size:11px;letter-spacing:1px;font-weight:800;text-transform:uppercase;color:var(--muted)}section{margin:32px 0}.steps{list-style:none;counter-reset:step;padding:0}.steps li{counter-increment:step;position:relative;padding:0 0 20px 43px}.steps li:before{content:counter(step);position:absolute;left:0;top:0;background:var(--soft);color:var(--teal);font-size:13px;font-weight:700;width:27px;height:27px;display:grid;place-items:center;border-radius:50%}.check{display:flex;gap:11px;padding:13px 0;border-bottom:1px solid var(--line);align-items:flex-start}.check input{width:18px;height:18px;accent-color:var(--teal);margin:4px 0 0;flex-shrink:0}.check:last-child{border:0}details{border:1px solid var(--line);border-radius:8px;background:#fff;padding:18px 21px;margin:18px 0}summary{font-weight:700;cursor:pointer}details p,details ul{margin-top:15px}.bottom-nav{display:flex;justify-content:space-between;gap:20px;border-top:1px solid var(--line);padding-top:25px;margin-top:32px}.complete{display:flex;align-items:center;gap:12px;margin:24px 0}.table-wrap{overflow-x:auto}table{width:100%;border-collapse:collapse;font-size:14px}th{text-align:left;background:#eef3f3;color:var(--muted);font-size:12px;letter-spacing:.3px}td,th{padding:13px;border-bottom:1px solid var(--line);vertical-align:top}ul{padding-left:22px}.tag{border:1px solid var(--line);border-radius:30px;padding:3px 9px;font-size:12px;display:inline-block}.diagram{background:#142b36;color:#fff;border-radius:10px;padding:25px;display:grid;grid-template-columns:1fr 1fr;gap:24px;margin:24px 0}.diagram .eyebrow{color:#83caff}.diagram p{font-size:14px;color:#c5d3d8}.diagram strong{display:block;margin:8px 0}.diagram ul{font-size:14px;color:#dde7eb}footer{border-top:1px solid var(--line);margin-top:42px;padding-top:20px;font-size:12px;color:var(--muted)}.skip{position:fixed;top:-100px;left:10px;z-index:10;padding:10px;background:#fff}.skip:focus{top:10px}.sr-only{position:absolute;width:1px;height:1px;padding:0;overflow:hidden;clip:rect(0,0,0,0)}.download-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}.download-grid button{text-align:left}.download-grid strong{display:block}.spaced{margin-top:36px}.plate-figure{margin:0;padding:22px;background:#fff;border:1px solid var(--line);border-radius:10px}.plate-figure svg{width:100%;height:auto;max-height:260px}.plate-figure figcaption{font-size:13px;color:var(--muted)}@media(max-width:1050px){header{gap:18px;padding:15px 20px}.brand-sub{display:none}#top-nav{gap:16px}.shell{grid-template-columns:230px 1fr}aside{padding:25px 12px}.grid{grid-template-columns:1fr}}@media(max-width:760px){header{position:relative;flex-wrap:wrap;gap:16px}.brand{font-size:20px;gap:6px}.brand-logo{width:44px;height:44px}.language{margin-left:auto}#top-nav{order:3;width:100%;margin:0;justify-content:space-between}.shell{display:block}aside{position:static;height:auto;border-right:0;border-bottom:1px solid var(--line);padding:18px 20px}.sidebar-lessons{display:none}.sidebar-lessons.open{display:block}.sidebar-toggle{width:100%;text-align:left;margin-top:12px}main{padding:28px 20px 50px}.diagram,.download-grid{grid-template-columns:1fr}.lead{font-size:17px}.card,.panel{padding:20px}.video{grid-template-columns:36px 1fr;padding:18px;gap:14px}.play{width:36px;height:36px}h1{font-size:34px}.bottom-nav{flex-wrap:wrap}}@media(min-width:761px){.sidebar-toggle{display:none}}@media print{header,aside,.actions,.bottom-nav,.complete,.skip,.language{display:none!important}.shell{display:block}main{max-width:none;padding:0}body{background:#fff;font-size:11pt}.panel,.card,.video{break-inside:avoid}details{display:block}details>*{display:block!important}a{color:#111}a[href^='http']:after{content:' (' attr(href) ')';font-size:8pt;overflow-wrap:anywhere}h1{font-size:28pt}h2{font-size:18pt}}

.footer-brand{display:flex;align-items:center;gap:8px;margin-bottom:12px;color:var(--ink);font-size:14px;font-weight:700}.footer-brand img{width:36px;height:36px;object-fit:contain}.brand:hover{color:var(--blue)}