:root{--bg:#091322;--nav:#0c182a;--panel:#111f32;--panel2:#15273c;--line:#24354a;--text:#eef5fc;--muted:#95a7be;--cyan:#80d6f5;--green:#b3ee64;--purple:#bb9ae9;--radius:16px;color-scheme:dark;font-family:Inter,-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font-size:14px;line-height:1.65}button,input,select{font:inherit}button,a,input,select{-webkit-tap-highlight-color:transparent}button{cursor:pointer}a{color:inherit;text-decoration:none}button{color:inherit}button:disabled{cursor:not-allowed;opacity:.4}button,a,input,select{outline-offset:5px}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible{outline:2px solid var(--cyan)}button{border:0}img{max-width:100%;display:block}svg.icon{width:20px;height:20px;fill:none;stroke:currentColor;stroke-width:1.6;stroke-linecap:round;stroke-linejoin:round;flex-shrink:0;vertical-align:middle}h1,h2,h3,h4,p{margin:0}h1,h2,h3,h4{line-height:1.4}h2{font-size:22px;letter-spacing:-.5px}h3{font-size:17px}small{font-size:12px}.muted{color:var(--muted)}.green-text{color:var(--green)}.cyan-text{color:var(--cyan)}.mono,.eyebrow,kbd{font-family:"SFMono-Regular",Consolas,monospace}.eyebrow{font-size:11px;letter-spacing:2px;color:var(--green)}.skip-link{position:fixed;top:-100px;left:20px;background:var(--green);color:var(--bg);padding:12px;z-index:100}.skip-link:focus{top:10px}
.sidebar{width:234px;position:fixed;left:0;top:0;bottom:0;background:var(--nav);border-right:1px solid var(--line);padding:30px 21px 20px;display:flex;flex-direction:column;z-index:30;overflow-y:auto}.brand{display:flex;align-items:center;gap:9px;font-size:20px;font-weight:900;letter-spacing:.8px;line-height:1.3}.brand small{display:block;font-size:8px;color:var(--muted);letter-spacing:1.2px;margin-top:5px}.brand-logo{width:48px;height:54px;object-fit:contain;flex:0 0 48px}.brand>span{min-width:0}.side-label{color:#72859d;font-size:10px;letter-spacing:1.5px;margin:36px 12px 12px}.sidebar nav{display:grid;gap:7px}.sidebar nav a{display:flex;align-items:center;gap:12px;padding:11px 12px;border-radius:7px;color:#b1bed0;transition:.2s}.sidebar nav a:hover{background:#182b40;color:white}.sidebar nav a.active{color:var(--green);background:#b3ee6410}.nav-count{margin-left:auto;font-size:11px;color:#71859d}.category-label{margin-top:26px}.dot{width:7px;height:7px;border-radius:2px;display:inline-block}.dot.cyan{background:var(--cyan)}.dot.green{background:var(--green)}.dot.purple{background:var(--purple)}.sidebar .categories a{font-size:13px}.sidebar-progress{margin-top:auto;border:1px solid var(--line);border-radius:12px;padding:15px;margin-bottom:22px;display:block;min-height:110px}.sidebar-progress .progress-title{display:flex;justify-content:space-between;font-size:12px}.sidebar-progress small{font-size:10px;color:var(--muted)}.progress-bar{height:4px;background:#26374c;border-radius:5px;overflow:hidden;margin:12px 0 8px}.progress-bar span{height:100%;display:block;background:var(--green);transition:width .3s}.side-footer{font-size:8px;color:#8297ae;letter-spacing:.6px;line-height:2}.side-footer>span:last-child{color:#596d85;font-size:10px;letter-spacing:0}.live-dot{display:inline-block;width:5px;height:5px;border-radius:50%;background:var(--green);margin-right:5px}
.workspace{margin-left:234px}.topbar{height:80px;border-bottom:1px solid var(--line);display:flex;align-items:center;gap:26px;padding:0 38px;background:#0c182a80}.top-breadcrumb{font-size:12px;color:var(--muted);white-space:nowrap}.top-breadcrumb span{padding:0 10px;color:#455c77}.top-breadcrumb b{font-weight:400;color:#e4ecf6}#search-form{display:flex;align-items:center;gap:10px;border:1px solid var(--line);border-radius:7px;padding:8px 12px;margin-left:auto;width:280px;color:#8d9db1}#global-search{width:100%;min-width:0;border:0;background:transparent;color:white;font-size:12px;outline:none}#global-search::placeholder{color:#71849e}kbd{font-size:10px;border:1px solid #314156;border-radius:3px;padding:0 5px;color:#6e839e}.team-badge{font-family:monospace;font-size:16px;color:var(--cyan);letter-spacing:1px;border-left:1px solid var(--line);padding-left:25px}.team-badge span{display:block;font-size:7px;color:var(--muted);letter-spacing:1.3px}.mobile-only{display:none}main{max-width:1450px;margin:auto;padding:30px 38px 50px;min-height:calc(100vh - 170px)}.page-footer{border-top:1px solid var(--line);padding:24px 38px;color:#6f849d;font-size:10px;display:flex;justify-content:space-between;gap:14px}.page-footer>span:first-child{font-weight:900;letter-spacing:1px;color:#99adc3}.page-footer b{font-size:9px;font-weight:400;margin-left:8px}.page-footer a:hover{color:var(--cyan)}.icon-button{display:inline-flex;align-items:center;justify-content:center;background:transparent;color:var(--muted);width:38px;height:38px;border:1px solid var(--line);border-radius:8px;flex-shrink:0}.icon-button:hover,.icon-button.saved{color:var(--green);border-color:var(--green)}.icon-button.saved svg{fill:#b3ee6422}
.hero{position:relative;display:grid;grid-template-columns:1.05fr 1fr;min-height:365px;overflow:hidden;background:linear-gradient(115deg,#152941 0%,#11243a 56%,#11293e 100%);border:1px solid #29465d;border-radius:18px}.hero:before{content:"";position:absolute;inset:0;background-image:linear-gradient(#80d6f507 1px,transparent 1px),linear-gradient(90deg,#80d6f507 1px,transparent 1px);background-size:28px 28px;pointer-events:none}.hero-copy{z-index:2;padding:37px 0 36px 34px}.hero .eyebrow{display:flex;align-items:center;gap:9px;font-size:9px;letter-spacing:1.9px}.hero .eyebrow:before{content:"";height:5px;width:5px;border-radius:50%;background:var(--green)}.hero h1{font-size:clamp(31px,3.4vw,49px);font-weight:800;letter-spacing:-1.7px;line-height:1.27;margin:20px 0 16px}.hero h1 span{color:var(--cyan)}.hero p{color:#9db3c9;font-size:12px;line-height:1.9;max-width:380px}.hero-actions{display:flex;gap:12px;margin-top:26px;align-items:center}.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;padding:11px 17px;border:1px solid var(--line);border-radius:7px;font-size:12px;background:var(--panel);line-height:1.6;min-height:42px;transition:.2s}.btn:hover{background:#243a50;transform:translateY(-1px)}.btn-primary{background:var(--green);color:#152418;border-color:var(--green);font-weight:650}.btn-primary:hover{background:#c5fa83;color:#152418}.btn-ghost{background:transparent;color:#bfd3e5;border-color:#3c536a}.btn .icon{width:16px;height:16px}.hero-art{position:relative;display:flex;align-items:center;justify-content:center;min-width:0}.orb{width:265px;height:265px;border-radius:50%;background:radial-gradient(circle at 30% 30%,#32638a88,#1d354b15 65%);border:1px solid #74c2e22b;position:absolute}.orb:before,.orb:after{content:"";position:absolute;border:1px dashed #86ccec2d;border-radius:50%;inset:-24px}.orb:after{inset:25px;border:1px solid #86ccec20}.hero-art img{width:112%;max-width:510px;position:relative;z-index:1;filter:drop-shadow(0 20px 25px #0006);transform:rotate(-4deg) translate(-10px,8px)}.art-label{position:absolute;z-index:2;font-size:8px;letter-spacing:1.3px;color:#91bdd6;border-bottom:1px solid #45738b;padding:0 0 5px}.art-label.top{right:24px;top:29px}.art-label.bottom{bottom:24px;left:20px}.art-label b{color:var(--green);font-size:11px;margin-right:8px}.hero-number{position:absolute;right:23px;bottom:13px;font-size:45px;color:#80d6f50d;font-weight:800;letter-spacing:-2px}
.stats-strip{display:grid;grid-template-columns:repeat(4,1fr);margin-top:20px;border-bottom:1px solid var(--line);padding:4px 0 25px}.stat{display:flex;gap:12px;align-items:center;border-right:1px solid var(--line);padding:0 20px}.stat:first-child{padding-left:2px}.stat:last-child{border:0}.stat strong{font-size:27px;font-weight:500;line-height:1}.stat small{display:block;color:var(--muted);font-size:11px}.stat span{font-family:monospace;font-size:8px;color:#647e99;letter-spacing:.7px}.section-heading{display:flex;justify-content:space-between;align-items:end;margin:32px 0 18px;gap:20px}.section-heading p{color:var(--muted);font-size:12px;margin-top:5px}.section-heading .eyebrow{font-size:8px;color:#637e9b;letter-spacing:1.6px;margin-bottom:6px}.text-link{color:var(--cyan);font-size:11px;display:flex;align-items:center;gap:7px;white-space:nowrap}.text-link .icon{width:14px;height:14px}.path-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:15px}.path-card{border:1px solid var(--line);background:var(--panel);border-radius:12px;padding:23px;position:relative;transition:.2s;overflow:hidden}.path-card:hover{border-color:#49667d;transform:translateY(-3px)}.path-card .path-icon{width:39px;height:39px;display:grid;place-items:center;background:#80d6f510;border:1px solid #80d6f525;border-radius:9px;color:var(--cyan);margin-bottom:20px}.path-card:nth-child(2) .path-icon{color:var(--green);background:#b3ee6410;border-color:#b3ee6425}.path-card:nth-child(3) .path-icon{color:var(--purple);background:#bb9ae910;border-color:#bb9ae925}.path-num{position:absolute;top:22px;right:22px;color:#3e536d;font-size:11px;font-family:monospace}.path-card h3{font-size:16px;margin-bottom:8px}.path-card p{font-size:11px;color:var(--muted);min-height:36px;line-height:1.8}.path-bottom{display:flex;align-items:center;justify-content:space-between;margin-top:20px;color:#7793ad;font-size:10px}.path-bottom svg{color:#d9ebfa}.home-lower{display:grid;grid-template-columns:minmax(0,1fr) 255px;gap:25px}.resource-list{border-top:1px solid var(--line)}.resource-row{display:flex;gap:16px;align-items:center;padding:17px 0;border-bottom:1px solid var(--line)}.resource-row>a:first-child{width:105px;flex-shrink:0;overflow:hidden;border-radius:7px}.resource-row img{width:105px;height:67px;object-fit:cover;opacity:.85}.resource-row .row-copy{flex:1;min-width:0}.row-copy h3{font-size:14px;margin-bottom:7px}.row-copy p{font-size:10px;color:var(--muted)}.row-copy .pill{margin-right:8px}.pill{font-size:9px;line-height:1.5;border:1px solid #80d6f52b;color:var(--cyan);background:#80d6f509;padding:3px 7px;border-radius:4px;display:inline-block}.pill.hardware{color:var(--purple);border-color:#bb9ae92b;background:#bb9ae909}.pill.mechanics{color:var(--green);border-color:#b3ee642b;background:#b3ee6409}.intro-card{background:#112136;border:1px solid #2a415c;border-radius:12px;padding:22px;margin-top:32px}.intro-card .eyebrow{font-size:8px}.intro-card h3{font-size:18px;margin:13px 0 10px}.intro-card p{color:var(--muted);font-size:11px;line-height:1.9}.intro-card .mini-steps{display:grid;gap:13px;margin:22px 0}.mini-steps a{font-size:11px;display:flex;gap:10px;align-items:center}.mini-steps span{font-family:monospace;border:1px solid #31516a;color:var(--cyan);border-radius:4px;width:23px;height:23px;display:grid;place-items:center;font-size:9px}.intro-card .text-link{border-top:1px solid var(--line);padding-top:16px}
.page-heading{margin:7px 0 27px}.page-heading h1{font-size:32px;letter-spacing:-1px;margin:9px 0 10px}.page-heading p{color:var(--muted);font-size:13px;max-width:720px}.page-heading .eyebrow{font-size:10px}.library-controls{display:flex;flex-wrap:wrap;align-items:center;gap:10px;border-bottom:1px solid var(--line);padding:0 0 17px;margin-bottom:22px}.filters{display:flex;flex-wrap:wrap;gap:7px}.filter{padding:7px 13px;background:transparent;border:1px solid var(--line);border-radius:6px;color:var(--muted);font-size:12px;min-height:36px}.filter.active{color:var(--bg);background:var(--cyan);border-color:var(--cyan)}.filter:hover{border-color:var(--cyan)}.sort{margin-left:auto;color:var(--muted);font-size:11px;display:flex;align-items:center;gap:8px}.sort select{background:var(--nav);color:#c3d1e1;border:1px solid var(--line);border-radius:6px;padding:7px;font-size:11px}.result-summary{font-size:11px;color:#8fa5bf;margin:14px 0}.query-banner{padding:10px 15px;background:#80d6f50c;border-left:2px solid var(--cyan);color:#cce9f8;margin-bottom:20px;display:flex;gap:15px;align-items:center;font-size:12px}.query-banner a{margin-left:auto;color:var(--cyan)}.lesson-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}.lesson-card{background:var(--panel);border:1px solid var(--line);border-radius:12px;overflow:hidden;transition:.2s}.lesson-card:hover{transform:translateY(-3px);border-color:#4b657d}.card-image{position:relative;display:block;overflow:hidden;background:#152b40;aspect-ratio:16/9}.card-image img{width:100%;height:100%;object-fit:cover;transition:transform .3s}.lesson-card:hover img{transform:scale(1.04)}.image-shade{position:absolute;inset:0;background:linear-gradient(transparent 45%,#091322aa)}.card-number{position:absolute;top:12px;left:12px;background:#0a1629df;font-family:monospace;font-size:11px;padding:3px 8px;border:1px solid #ffffff20;border-radius:4px}.card-type{position:absolute;bottom:11px;left:13px;font-size:9px;color:#e8f5fd;display:flex;align-items:center;gap:5px}.card-type .icon{width:14px;height:14px}.card-content{padding:18px}.card-content h3{font-size:16px;margin:11px 0 9px;min-height:45px}.card-content p{font-size:11px;color:var(--muted);line-height:1.9;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;min-height:42px}.card-meta{display:flex;align-items:center;justify-content:space-between;margin-top:17px;border-top:1px solid var(--line);padding-top:12px;color:#7c94ad;font-size:10px}.card-meta .icon-button{width:30px;height:30px;border:0}.card-meta .icon{width:17px;height:17px}.completed-label{color:var(--green);font-size:10px}.pdf-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:20px}.pdf-card{display:flex;gap:22px;align-items:center;padding:24px;border:1px solid var(--line);border-radius:12px;background:var(--panel)}.pdf-cover{position:relative;width:72px;height:93px;background:#1f3652;border:1px solid #4d7498;border-radius:3px 8px 8px 3px;display:flex;flex-direction:column;justify-content:center;padding:12px;color:var(--cyan);flex-shrink:0;box-shadow:4px 4px #081423}.pdf-cover:before{content:"BITBYBIT";font-size:7px;letter-spacing:1px;position:absolute;top:10px}.pdf-cover b{font-size:20px;letter-spacing:-1px}.pdf-cover small{font-size:8px;color:#93abc4}.pdf-card h3{font-size:15px}.pdf-card p{color:var(--muted);font-size:11px;margin:7px 0 12px}.pdf-card .text-link{display:inline-flex;margin-right:16px}.empty-state{padding:60px 25px;text-align:center;border:1px dashed #304359;border-radius:14px}.empty-state h2{margin:16px 0 10px}.empty-state p{color:var(--muted);margin-bottom:25px}.empty-state>.icon{width:40px;height:40px;color:var(--cyan)}
.back-link{display:inline-flex;gap:7px;align-items:center;color:var(--muted);font-size:12px;margin:0 0 26px}.back-link:hover{color:var(--cyan)}.back-link .icon{width:16px;height:16px}.article-layout{display:grid;grid-template-columns:minmax(0,1fr) 226px;gap:32px}.article-head h1{font-size:32px;letter-spacing:-1px;margin:16px 0 10px}.article-head .english{font-size:12px;color:#7e99b5;line-height:1.7}.article-head .summary{font-size:14px;color:#c0d0e1;margin:18px 0;line-height:1.9}.article-meta{display:flex;align-items:center;gap:12px;flex-wrap:wrap;font-size:10px;color:#7e95ae}.article-meta .icon-button{margin-left:auto}.article-section{padding:32px 0;border-bottom:1px solid var(--line);scroll-margin-top:20px}.article-section h2{font-size:22px;margin-bottom:20px}.article-section p{font-size:14px;color:#b9cadc;line-height:2;margin-top:14px}.article-image{border:1px solid var(--line);border-radius:10px;overflow:hidden;background:#03080d}.article-image img{width:100%;height:auto}.caption{display:flex;align-items:center;justify-content:space-between;font-size:10px;color:#7e93ab;margin-top:8px;gap:15px}.timestamp{font-family:monospace;color:var(--cyan);display:inline-flex;gap:5px;align-items:center}.timestamp svg{width:13px;height:13px}.article-aside>div{position:sticky;top:25px;border:1px solid var(--line);border-radius:12px;padding:21px;background:#0f1f33}.article-aside h3{font-size:12px;color:#c3d4e5;margin-bottom:17px}.article-toc{display:grid;gap:16px}.article-toc a{font-size:11px;color:#8ba3bd}.article-toc a:hover{color:var(--cyan)}.article-toc span{color:#4e6a86;font-family:monospace;margin-right:8px}.aside-note{color:#849ab3;font-size:10px;border-top:1px solid var(--line);padding-top:16px;margin-top:21px;line-height:1.8}.article-aside .btn{width:100%;margin-top:16px;font-size:11px}.points{display:grid;gap:0}.point{display:grid;grid-template-columns:100px 1fr;gap:20px;padding:17px 0;border-bottom:1px solid #24354a80}.point strong{font-size:13px;color:var(--cyan)}.point p{font-size:13px;line-height:1.9;margin:0}.exercise{background:#b3ee6408;border:1px solid #b3ee6440;border-radius:12px;padding:23px;margin:25px 0}.exercise h3{color:var(--green);font-size:14px;margin-bottom:10px}.exercise p{font-size:13px;line-height:1.9;color:#c1d2c0}.exercise details{margin-top:14px;font-size:12px;color:#b6d5bd}.exercise summary{cursor:pointer;color:var(--green)}.exercise details p{margin-top:10px}.lesson-complete{display:flex;justify-content:space-between;align-items:center;padding:25px 0;gap:15px}.lesson-complete small{color:var(--muted)}.next-lesson{display:block;border:1px solid var(--line);border-radius:10px;padding:20px;margin-top:10px;background:var(--panel)}.next-lesson span{display:block;color:var(--muted);font-size:10px;margin-bottom:5px}.next-lesson strong{font-size:15px;display:flex;justify-content:space-between;align-items:center}.tool-box{border:1px solid #40657a;background:#0f2839;padding:24px;border-radius:12px;margin-top:28px}.tool-box h3{color:var(--cyan);font-size:15px}.tool-box>p{font-size:11px;margin:7px 0 20px;color:var(--muted)}.tool-inputs{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}.tool-inputs label{font-size:11px;color:#9eb7ce;display:block}.tool-inputs input{display:block;width:100%;margin-top:6px;background:#0a1828;color:white;border:1px solid #34516a;border-radius:6px;padding:9px}.tool-result{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;border-top:1px solid #325069;margin-top:20px;padding-top:17px}.tool-result strong{display:block;font-size:19px;color:var(--green);font-weight:500}.tool-result span{font-size:9px;color:var(--muted)}.tool-error{color:#ffbd96;margin-top:10px;font-size:12px}.wheel-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:10px;margin-top:18px}.wheel-grid div{border:1px solid #33566e;padding:10px;border-radius:5px;font-size:11px;color:#99b9d0;display:flex;justify-content:space-between;gap:10px}.wheel-grid b{color:var(--green);font-family:monospace}.tool-inputs .range-row{grid-column:1/-1;display:flex;align-items:center;gap:12px}.range-row input{padding:0;accent-color:var(--cyan);margin:0;flex:1;min-width:30px}.range-row span{width:95px;flex-shrink:0}.range-row output{font-family:monospace;color:var(--cyan);width:38px;text-align:right}
.path-detail{display:grid;grid-template-columns:250px 1fr;gap:30px;padding:27px;border:1px solid var(--line);border-radius:14px;background:var(--panel);margin-bottom:20px}.path-detail h2{font-size:22px;margin:14px 0}.path-detail p{font-size:12px;color:var(--muted)}.path-lessons{display:grid;gap:11px}.path-lessons a{display:flex;align-items:center;gap:13px;border:1px solid var(--line);background:#0c182a;padding:13px 15px;border-radius:7px;font-size:12px}.path-lessons a:hover{border-color:var(--cyan)}.path-lessons a>span:first-child{font-family:monospace;color:var(--green);font-size:10px}.path-lessons .icon{margin-left:auto;width:16px;height:16px}.channel-detail{max-width:860px}.channel-hero{display:grid;grid-template-columns:1fr 1fr;gap:24px;border:1px solid var(--line);background:var(--panel);border-radius:14px;padding:23px;align-items:center}.channel-hero img{border-radius:8px;width:100%}.channel-hero p{color:var(--muted);font-size:13px;line-height:1.9}.channel-hero .btn{margin-top:20px}.course-links{display:grid;gap:12px;margin:25px 0}.course-links a{padding:20px;border:1px solid var(--line);background:var(--panel);border-radius:10px;display:flex;justify-content:space-between;font-size:14px}.notice{border-left:2px solid #6587a4;background:#112236;padding:13px 17px;font-size:11px;color:#8ea7c1;margin-top:25px;line-height:1.9}.reader-bar{display:flex;gap:12px;align-items:center;justify-content:space-between;position:sticky;top:0;z-index:10;background:#0c182aef;backdrop-filter:blur(12px);padding:12px;border:1px solid var(--line);border-radius:10px;margin-bottom:22px}.reader-controls{display:flex;gap:12px;align-items:center}.reader-controls select{background:#172b42;border:1px solid #314962;color:white;border-radius:5px;padding:6px}.reader-page{max-width:820px;margin:auto}.reader-page img{width:100%;height:auto;box-shadow:0 10px 40px #0005}.reader-footer{text-align:center;color:var(--muted);font-size:11px;margin-top:18px}.progress-top{border:1px solid var(--line);border-radius:12px;background:var(--panel);padding:25px;margin-bottom:25px;display:flex;gap:30px;align-items:center}.progress-top strong{font-size:40px;color:var(--green);font-weight:400;white-space:nowrap}.progress-top>div{flex:1}.progress-top h3{font-size:16px}.progress-top p{font-size:11px;color:var(--muted)}.progress-row{display:flex;gap:17px;align-items:center;border-bottom:1px solid var(--line);padding:18px 0}.progress-row a{flex:1}.progress-row h3{font-size:14px}.progress-row p{font-size:10px;color:var(--muted);margin-top:4px}.check-button{width:26px;height:26px;border:1px solid #3c5770;border-radius:50%;color:#58718b;background:transparent;display:grid;place-items:center;flex-shrink:0}.check-button.done{background:var(--green);color:#152618;border-color:var(--green)}.check-button svg{width:16px;height:16px}.utility-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:25px}.about-content{max-width:800px}.about-content h2{font-size:20px;margin:30px 0 12px}.about-content p{color:var(--muted);line-height:1.9;margin:10px 0}.about-content a{color:var(--cyan)}.toast{position:fixed;bottom:25px;left:calc(50% + 117px);transform:translate(-50%,15px);z-index:100;background:#d2f4b3;color:#142518;box-shadow:0 8px 40px #0005;border-radius:8px;padding:12px 22px;font-size:12px;opacity:0;pointer-events:none;transition:.2s;max-width:90vw}.toast.show{opacity:1;transform:translate(-50%,0)}
.icon-button.mobile-only{display:none}
@media(min-width:1550px){.hero{min-height:410px}.hero-copy{padding:45px}.hero-art img{max-width:560px}.hero h1{font-size:52px}}
@media(max-width:1150px){.sidebar{width:205px;padding:27px 16px 20px}.brand{font-size:18px}.brand-logo{width:44px;height:50px;flex-basis:44px}.workspace{margin-left:205px}.topbar{padding:0 26px;gap:18px}main{padding:26px}.team-badge{display:none}.hero-copy{padding-left:26px}.hero h1{font-size:36px}.hero{min-height:340px}.hero-art img{width:120%;max-width:none}.path-card{padding:18px}.home-lower{grid-template-columns:minmax(0,1fr) 230px;gap:20px}.article-layout{grid-template-columns:minmax(0,1fr) 190px;gap:23px}.article-aside>div{padding:16px}.lesson-grid{gap:14px}.card-content{padding:15px}.card-content h3{font-size:14px}.card-content p{font-size:10px}.stat{padding:0 13px;gap:9px}.stat strong{font-size:24px}.stat small{font-size:10px}.toast{left:calc(50% + 102px)}}
@media(max-width:900px){.sidebar{width:190px;padding-left:14px;padding-right:14px}.workspace{margin-left:190px}.brand{font-size:16px;gap:8px}.brand small{font-size:7px}.brand-logo{width:40px;height:46px;flex-basis:40px}.top-breadcrumb{font-size:10px}.topbar{padding:0 22px}#search-form{width:230px}.hero{grid-template-columns:1fr .8fr;min-height:320px}.hero h1{font-size:30px}.hero-copy{padding:28px 0 28px 24px}.hero p{font-size:11px}.hero .eyebrow{font-size:8px}.orb{width:190px;height:190px}.hero-art img{width:140%}.art-label{display:none}.hero-actions{gap:8px}.hero-actions .btn{padding:9px 12px;font-size:10px}.path-grid{gap:10px}.path-card{padding:16px}.path-card h3{font-size:14px}.path-card p{font-size:10px}.path-card .path-icon{margin-bottom:15px}.home-lower{grid-template-columns:1fr}.intro-card{margin-top:5px}.intro-card .mini-steps{grid-template-columns:repeat(3,1fr)}.lesson-grid{grid-template-columns:repeat(2,1fr)}.pdf-grid{grid-template-columns:1fr}.article-layout{grid-template-columns:1fr}.article-aside{display:none}.path-detail{grid-template-columns:1fr;gap:22px}.channel-hero{grid-template-columns:1fr}.toast{left:calc(50% + 95px)}.stat{gap:7px;padding:0 10px}.stat span{font-size:7px}.stat strong{font-size:22px}.stat small{font-size:9px}}
@media(max-width:700px){.brand{font-size:20px}.brand-logo{width:48px;height:54px;flex-basis:48px}.sidebar{transform:translateX(-100%);transition:transform .2s;width:250px;padding:29px 22px;z-index:50}.sidebar.open{transform:translateX(0)}.mobile-backdrop.show{display:block;position:fixed;inset:0;background:#0009;z-index:40;backdrop-filter:blur(3px)}.workspace{margin-left:0}.mobile-only{display:inline-flex}.topbar{height:65px;padding:0 18px;gap:12px}.top-breadcrumb{font-size:11px}.top-breadcrumb>span,.top-breadcrumb>b{display:none}#search-form{padding:7px 9px;max-width:220px;flex:1}#global-search{font-size:11px}#search-form kbd{display:none}#search-form .icon{width:16px}.menu-toggle{display:flex}main{padding:20px 18px 35px}.hero{grid-template-columns:1fr;min-height:0;border-radius:13px;overflow:hidden}.hero-copy{padding:29px 24px 0}.hero .eyebrow{font-size:8px;letter-spacing:1.6px}.hero h1{font-size:37px;line-height:1.28;margin:18px 0 14px;letter-spacing:-1.7px}.hero p{font-size:12px;max-width:320px}.hero-actions{margin-top:23px;gap:10px}.hero-actions .btn{font-size:12px;padding:10px 15px}.hero-art{height:243px;margin-top:0}.hero-art img{width:89%;max-width:390px;transform:rotate(-5deg) translateY(2px)}.orb{width:200px;height:200px}.art-label{display:block}.art-label.top{right:20px;top:24px;font-size:7px}.art-label.bottom{bottom:18px;font-size:7px}.hero-number{font-size:40px}.stats-strip{margin-top:15px;padding-bottom:19px;grid-template-columns:repeat(4,1fr)}.stat{display:block;text-align:center;padding:0 6px}.stat:first-child{padding-left:0}.stat strong{font-size:24px;display:block;margin-bottom:5px}.stat small{font-size:9px}.stat span{display:none}.section-heading{margin-top:26px;margin-bottom:16px;gap:10px}.section-heading h2{font-size:20px}.section-heading p{font-size:11px}.section-heading .eyebrow{font-size:7px}.text-link{font-size:10px}.path-grid{grid-template-columns:1fr;gap:11px}.path-card{padding:19px 19px 19px 75px;min-height:120px}.path-card .path-icon{position:absolute;left:18px;top:21px;width:39px;height:39px}.path-card h3{font-size:16px;margin-bottom:5px}.path-card p{font-size:11px;min-height:0;padding-right:9px}.path-num{font-size:9px;top:11px;right:13px}.path-bottom{margin-top:12px;font-size:9px}.path-bottom .icon{width:16px}.home-lower{gap:18px}.resource-row{gap:12px;padding:15px 0}.resource-row>a:first-child,.resource-row img{width:88px}.resource-row img{height:61px}.row-copy h3{font-size:12px;margin-bottom:6px}.row-copy p{font-size:9px}.resource-row .icon-button{width:30px;height:30px;border:0}.resource-row .icon-button svg{width:17px}.row-copy .pill{font-size:8px;padding:2px 5px;margin-right:4px}.intro-card{margin-top:0}.intro-card .mini-steps{grid-template-columns:1fr}.page-footer{padding:20px 18px;flex-wrap:wrap;font-size:9px}.page-footer>span:nth-child(2){display:none}.toast{left:50%;bottom:20px;width:max-content}.page-heading h1{font-size:29px}.page-heading p{font-size:12px}.page-heading{margin:7px 0 23px}.filters{gap:6px}.filter{padding:6px 10px;font-size:11px;min-height:34px}.sort{margin-left:0;width:100%;justify-content:flex-end;margin-top:5px;font-size:10px}.library-controls{gap:7px}.lesson-grid{gap:12px}.card-content{padding:13px}.card-content h3{font-size:13px;line-height:1.5;min-height:39px;margin:9px 0 7px}.card-content p{font-size:10px;min-height:38px}.card-content .pill{font-size:8px}.card-meta{font-size:9px;margin-top:12px;padding-top:8px}.card-meta .icon-button{width:25px;height:25px}.card-type{font-size:8px;bottom:7px;left:9px}.card-number{font-size:9px;top:7px;left:8px;padding:1px 6px}.pdf-card{padding:20px;gap:17px}.pdf-card h3{font-size:14px}.pdf-card p{font-size:10px}.pdf-cover{width:58px;height:80px;padding:9px}.pdf-cover b{font-size:18px}.pdf-cover:before{font-size:6px}.back-link{font-size:11px;margin-bottom:20px}.article-head h1{font-size:28px;line-height:1.5}.article-head .english{font-size:11px}.article-head .summary{font-size:13px}.article-meta{font-size:9px;gap:8px}.article-section{padding:26px 0}.article-section h2{font-size:21px}.article-section p{font-size:14px;line-height:1.95}.point{grid-template-columns:1fr;gap:5px;padding:15px 0}.point strong{font-size:12px}.point p{font-size:13px;margin:0}.caption{font-size:9px}.exercise{padding:20px}.tool-box{padding:20px}.tool-result{gap:8px}.tool-result strong{font-size:17px}.lesson-complete{align-items:flex-start;flex-direction:column;gap:12px}.lesson-complete small{font-size:10px}.path-detail{padding:22px}.path-detail h2{font-size:21px}.path-lessons a{font-size:11px;padding:12px}.reader-bar{flex-wrap:wrap;padding:10px;gap:10px}.reader-controls{gap:9px;font-size:11px}.reader-controls select{max-width:140px;font-size:11px}.reader-controls .icon-button{width:32px;height:32px}.reader-bar .btn{font-size:10px;padding:7px 11px;min-height:33px}.reader-page{margin:0 -6px}.progress-top{padding:20px;gap:20px}.progress-top strong{font-size:34px}.progress-top h3{font-size:14px}.progress-top p{font-size:10px}.progress-row{gap:12px}.progress-row h3{font-size:12px}.progress-row p{font-size:9px}.progress-row .pill{font-size:8px}.utility-actions .btn{font-size:11px}.channel-hero{padding:18px}.course-links a{font-size:12px;padding:17px}}
@media(max-width:370px){.top-breadcrumb{display:none}.hero h1{font-size:33px}.hero-copy{padding:25px 20px 0}.hero-art{height:220px}.lesson-grid{grid-template-columns:1fr}.card-content h3{min-height:0;font-size:16px}.card-content p{font-size:12px}.card-meta{font-size:11px}.card-image{aspect-ratio:16/8}.tool-result{grid-template-columns:1fr}.tool-result>div{display:flex;gap:15px;align-items:center}.reader-bar{justify-content:center}}
@media(max-width:700px){.icon-button.mobile-only{display:inline-flex}.hero h1{font-size:34px}.hero h1 span{display:block}.hero-art{height:230px}}
@media(prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}
@media print{.sidebar,.topbar,.page-footer,.article-aside,.btn,.tool-box,.icon-button,.lesson-complete,.next-lesson{display:none!important}.workspace{margin:0}body{background:white;color:black}.article-layout{display:block}.article-section p,.point p,.summary{color:#333!important}.article-image{max-width:550px}.article-section{break-inside:avoid}.article-head h1{font-size:28px}main{padding:0}.article-section h2,.point strong{color:#111}.exercise{border-color:#aaa;background:white}.exercise p,.exercise h3{color:#111}}

.mobile-sources{display:none}@media(max-width:900px){.mobile-sources{display:flex;gap:10px;flex-wrap:wrap;margin-top:20px}.mobile-sources .btn{font-size:11px;padding:8px 12px}.mobile-sources p{width:100%;font-size:10px;color:var(--muted)}}

.sidebar .categories{gap:1px}.sidebar .categories a{padding-top:7px;padding-bottom:7px}.sidebar-progress{margin-top:24px;flex-shrink:0}.side-label{margin-top:25px}.dot.amber{background:#f3c477}.dot.coral{background:#f4a7a3}.pill.fabrication{color:#f3c477;border-color:#f3c47744;background:#f3c4770b}.pill.control{color:#f4a7a3;border-color:#f4a7a344;background:#f4a7a30b}.pill.localization{color:#80d6f5;border-color:#80d6f544;background:#80d6f50b}.mobile-toc{display:none}

.note-art{position:relative;display:flex;align-items:center;justify-content:center;width:100%;height:100%;min-height:67px;background-color:#102b3a;background-image:linear-gradient(#80d6f509 1px,transparent 1px),linear-gradient(90deg,#80d6f509 1px,transparent 1px);background-size:22px 22px;color:#80d6f5;overflow:hidden}.note-art.fabrication{background-color:#2a2924;color:#f3c477}.note-art.control{background-color:#302431;color:#f4a7a3}.note-art.mechanics{background-color:#203029;color:#b3ee64}.note-art>svg{width:44%;height:80%;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round;opacity:.9}.note-art>span{font-size:12px;letter-spacing:2px;position:absolute;right:14px;bottom:34px;color:currentColor;font-weight:600;writing-mode:vertical-rl;opacity:.8}.resource-row .note-art{width:105px;height:67px}.resource-row .note-art>span{display:none}
.learning-brief{margin-top:26px;padding:24px;background:var(--panel);border:1px solid var(--line);border-radius:12px;display:grid;grid-template-columns:1.3fr 1fr;gap:25px}.learning-brief h2,.learning-brief h3{font-size:14px;color:var(--cyan);margin-bottom:10px}.learning-brief ul{margin:0;padding-left:18px;color:#b8cadd;font-size:12px;line-height:2}.learning-brief li+li{margin-top:6px}.chapter-heading{display:flex;align-items:baseline;justify-content:space-between;gap:16px}.chapter-heading h2{flex:1;min-width:0}.chapter-heading .timestamp{white-space:nowrap;font-size:11px;flex-shrink:0}.glossary{margin:0}.glossary>div{padding:13px 0;border-bottom:1px solid #24354a80;display:grid;grid-template-columns:175px 1fr;gap:18px}.glossary dt{font-size:12px;font-family:Consolas,monospace;color:var(--cyan);overflow-wrap:anywhere}.glossary dd{margin:0;font-size:13px;color:#b9cadc;line-height:1.9}.edition-tag{display:inline-block;margin-left:9px;padding:3px 8px;border:1px solid #e9bf6f55;background:#e9bf6f0b;border-radius:4px;color:#e9bf6f;font-size:10px}.version-note{border-left-color:#e9bf6f;color:#cbb68e}.source-note p{margin:6px 0 12px}.source-note a{white-space:normal;overflow-wrap:anywhere;align-items:flex-start;margin-top:8px}.source-note a svg{margin-top:3px}.source-references{border-top:1px solid #294259;margin-top:12px;padding-top:4px}.exercise .eyebrow{font-size:8px;letter-spacing:1.5px;margin-bottom:9px}.article-aside>div{max-height:calc(100vh - 50px);overflow-y:auto}.article-section code,.point code,.exercise code{color:#d3eaf5;background:#172c3e;border-radius:3px;padding:2px 5px;font-size:.92em;overflow-wrap:anywhere}.article-section strong{color:#e1edf8}.article-head .english{overflow-wrap:anywhere}
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.query-banner{flex-wrap:wrap;gap:12px}.query-banner a{white-space:nowrap;margin-left:0}.query-banner a:last-child{margin-left:auto}@media(max-width:700px){.query-banner{display:grid;grid-template-columns:1fr 1fr}.query-banner>span{grid-column:1/-1}.query-banner a{font-size:12px}}

.article-image a{display:block;cursor:zoom-in}.image-guide{margin:14px 0 22px;padding:16px 20px;background:#11283a;border:1px solid #2b4b5e;border-radius:8px}.image-guide strong{font-size:11px;letter-spacing:1px;color:var(--cyan)}.image-guide p{font-size:13px;line-height:1.9;margin:6px 0 0;color:#bfdae6}@media(max-width:700px){.image-guide{padding:14px 16px}}