:root{--bg:#f8f9fa;--panel:#ffffff;--ink:#1a1d20;--muted:#59616a;--line:#dee2e6;--line-strong:#cbd1d6;--accent:#0284c7;--accent-strong:#0369a1;--accent-soft:#eef6fa;--code-bg:#f1f3f5;--grid:#dee2e6;--orange:#f97316;--green:#0d9488;--dark-panel:#181b20;color-scheme:light}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);position:relative;isolation:isolate;font-family:Noto Sans SC,PingFang SC,Microsoft YaHei,system-ui,-apple-system,Segoe UI,sans-serif;font-size:16px;line-height:1.85;-webkit-text-size-adjust:100%}.foot,.shell{position:relative;z-index:1}h1,h2,h3{font-family:Noto Sans SC,PingFang SC,Microsoft YaHei,system-ui,sans-serif;font-weight:650;text-wrap:balance;letter-spacing:0}a{color:var(--accent)}main{min-width:0;display:flex;flex-direction:column;gap:34px}article{background:var(--panel);border:1px solid var(--line);border-radius:4px;padding:44px 48px 40px;overflow-wrap:anywhere}@media(max-width:640px){article{padding:26px 20px;border-radius:4px}}article>h1{font-size:27px;line-height:1.45;margin:0 0 26px}.prose h2,article h2{font-size:20px;margin:56px 0 18px;padding-top:23px;border-top:2px solid color-mix(in srgb,var(--accent) 24%,var(--line));line-height:1.5}.prose>h2:first-of-type{border-top:0;padding-top:0}.prose h3,article h3{font-size:17px;margin:30px 0 12px}p{margin:0 0 16px}strong{font-weight:650}hr{border:0;border-top:1px solid var(--line);margin:34px 0;max-width:44em}blockquote{margin:0 0 22px;padding:16px 20px;background:var(--accent-soft);border-left:3px solid var(--accent);border-radius:0 10px 10px 0;font-size:14.5px;line-height:1.8}blockquote p{margin:0 0 6px}blockquote p:last-child{margin:0}ol,ul{margin:0 0 18px;padding-left:1.55em}li{margin:0 0 8px}.prose>picture{display:block;margin:30px auto 28px;width:100%}.prose p>img{display:block;margin:28px auto 26px}.prose img{max-width:100%;height:auto;background:#fff;cursor:zoom-in}.prose img,.table-wrap{border:1px solid var(--line);border-radius:10px}.table-wrap{overflow-x:auto;margin:0 0 22px}.prose table{border-collapse:collapse;width:100%;font-size:14.5px;font-feature-settings:"tnum";font-variant-numeric:tabular-nums}.prose td,.prose th{padding:10px 14px;text-align:left;border-bottom:1px solid var(--line);vertical-align:top;line-height:1.7}.prose th{background:var(--code-bg);font-weight:650;white-space:nowrap;font-size:13.5px}.prose tr:last-child td{border-bottom:0}code{padding:1px 5px;border-radius:4px;font-size:.9em;font-family:ui-monospace,SFMono-Regular,Consolas,monospace}code,pre{background:var(--code-bg)}pre{border:1px solid var(--line);border-radius:10px;padding:16px 18px;overflow-x:auto;margin:0 0 22px;font-size:13.5px;line-height:1.7}pre code{background:none;padding:0}.prose audio{width:100%;margin:18px 0}.prose .audio-preview{display:grid;grid-template-columns:minmax(8.5rem,.65fr) minmax(230px,1.35fr);gap:14px;align-items:center;margin:10px 0;padding:10px 12px;background:var(--code-bg);border:1px solid var(--line);border-radius:10px}.prose .audio-preview-label{font-size:13.5px;line-height:1.55;color:var(--ink);font-weight:600}.prose .audio-preview audio{min-width:0;margin:0;height:36px}@media(max-width:600px){.prose .audio-preview{grid-template-columns:1fr;gap:7px}}.katex-display{overflow-x:auto;overflow-y:hidden;background:var(--accent-soft);border-radius:10px;padding:14px 18px;margin:0 0 22px}.pager{display:flex;justify-content:space-between;gap:20px;margin-top:44px;padding-top:22px;border-top:1px solid var(--line);font-size:14px}.pager a{max-width:47%;line-height:1.6}.crumb{display:none}.shell.home main{gap:0}.group{margin:0 0 30px;border-left:3px solid color-mix(in srgb,var(--accent) 55%,var(--line));background:transparent}.group h2{font-size:22px;margin:0;padding:13px 17px;border:0;line-height:1.45;background:linear-gradient(90deg,var(--accent-soft),transparent 82%)}.group .group-range{font-family:ui-monospace,Consolas,monospace;font-size:13px;letter-spacing:.1em;color:var(--accent);margin-right:.75em;vertical-align:.12em}.lesson-list{list-style:none;padding:8px 8px 9px 13px;margin:0}.lesson-list a{display:flex;gap:12px;padding:12px;border-radius:10px;text-decoration:none;color:inherit;align-items:baseline}.lesson-list a:hover{background:var(--accent-soft)}.lesson-n{font-family:ui-monospace,Consolas,monospace;font-feature-settings:"tnum";font-variant-numeric:tabular-nums;color:var(--accent);font-weight:600;font-size:12.5px;min-width:1.8rem}.lesson-body{display:flex;flex-direction:column;gap:2px;min-width:0}.lesson-title{font-weight:600;line-height:1.6}.lesson-lead{display:grid;grid-template-rows:0fr;opacity:0;transition:grid-template-rows .22s ease,opacity .18s ease,margin-top .22s ease;color:var(--muted);font-size:13.5px;line-height:1.75;margin-top:0}.lesson-lead>span{overflow:hidden;min-height:0}.lesson-list a:focus-visible .lesson-lead,.lesson-list a:hover .lesson-lead{grid-template-rows:1fr;opacity:1;margin-top:5px}@media(prefers-reduced-motion:reduce){.lesson-lead{transition:none}}.lab{margin:34px 0;padding:22px 24px 24px;border:1px solid var(--line);border-radius:12px;background:var(--accent-soft)}.lab figcaption{font-size:14px;color:var(--muted);margin-bottom:16px;line-height:1.8}.lab figcaption strong{color:var(--ink);display:block;font-size:15.5px;margin-bottom:4px;font-family:inherit}.lab-skeleton{color:var(--muted);text-align:center;padding:48px 16px}.lab-controls{display:flex;flex-direction:column;gap:10px;margin-bottom:18px}.lab-slider{display:grid;grid-template-columns:5.5rem 1fr auto;gap:12px;align-items:center;font-size:13.5px}.lab-slider input{width:100%;accent-color:var(--accent)}.lab-slider output{color:var(--muted);font-feature-settings:"tnum";font-variant-numeric:tabular-nums;font-family:ui-monospace,Consolas,monospace;font-size:12.5px;min-width:11rem;text-align:right}.lab-slider-label{color:var(--muted)}.lab-choice{display:grid;grid-template-columns:5.5rem 1fr;gap:12px;align-items:center;font-size:13.5px}.lab-choice div[role=group]{display:flex;gap:6px;flex-wrap:wrap}.lab-choice button{border:1px solid var(--line);background:var(--panel);color:var(--muted);border-radius:4px;padding:4px 13px;font-size:12.5px;cursor:pointer;font-family:inherit}.lab-choice button[aria-pressed=true]{background:var(--accent);border-color:var(--accent);color:#fff}.lab-canvas{display:flex;flex-direction:column;gap:10px}.anim canvas,.lab-canvas canvas{display:block;background:var(--panel);border:1px solid var(--line);border-radius:10px}.lab-readout{font-size:13.5px;color:var(--muted);line-height:1.85;margin:4px 0 0}.lab-readout b{color:var(--ink);font-feature-settings:"tnum";font-variant-numeric:tabular-nums}.lab-audio-row{display:flex;align-items:center;gap:13px;flex-wrap:wrap;margin-top:4px}.lab-audio-button{border:1px solid var(--ink);background:var(--ink);color:#fff;border-radius:4px;padding:8px 18px;min-width:7.5rem;cursor:pointer;font:600 13px/1.2 inherit;box-shadow:none;transition:background .16s ease,border-color .16s ease}.lab-audio-button:hover{background:#2d3136;border-color:#2d3136}.lab-audio-button[aria-pressed=true]{background:var(--panel);color:var(--accent)}.lab-audio-status{display:inline-flex;align-items:center;gap:8px;color:var(--muted);font-size:12.5px}.lab-audio-status i{width:7px;height:7px;border-radius:50%;background:var(--line);box-shadow:0 0 0 4px transparent}.lab-audio-status.is-playing i{background:var(--green);animation:tone-pulse 1.2s ease-out infinite}@keyframes tone-pulse{50%{box-shadow:0 0 0 5px color-mix(in srgb,var(--green) 18%,transparent)}}@media(max-width:620px){.lab-choice,.lab-slider{grid-template-columns:1fr;gap:4px}.lab-slider output{text-align:left}}@media(prefers-reduced-motion:reduce){.lab-audio-button{transition:none}.lab-audio-status.is-playing i{animation:none}}.anim{display:flex;flex-direction:column;gap:10px}.anim-bar{display:flex;align-items:center;gap:12px;flex-wrap:wrap;font-size:12.5px}.anim-bar button{border:1px solid var(--line);background:var(--panel);color:var(--ink);border-radius:4px;padding:4px 16px;cursor:pointer;font-family:inherit;font-size:12.5px;min-width:4rem}.anim-bar button[aria-pressed=true]{border-color:var(--accent);color:var(--accent)}.anim-bar input[type=range]{flex:1 1;min-width:8rem;accent-color:var(--accent)}.anim-caption{color:var(--muted)}@media(max-width:620px){.anim-caption{flex-basis:100%}}.site-footer{max-width:1240px;margin:0 auto;padding:0 22px 60px;color:var(--muted);font-size:13px}@media(prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}}.toc{font-size:13.5px;line-height:1.6}.toc-toggle{display:flex;align-items:center;justify-content:space-between;width:100%;margin:0 0 10px;padding:0;border:0;background:none;color:var(--muted);cursor:pointer;font:11px/1.6 ui-monospace,Consolas,monospace;letter-spacing:.16em;text-align:left}.toc-action{font-size:10px;letter-spacing:.06em;opacity:.66}.toc ol{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:1px}.toc ol[hidden]{display:none}.toc a{display:flex;gap:9px;padding:7px 10px;border-radius:8px;color:var(--muted);text-decoration:none;border-left:2px solid transparent}.toc a:hover{background:var(--accent-soft);color:var(--ink)}.toc a[aria-current=true]{color:var(--accent);background:var(--accent-soft);border-left-color:var(--accent);font-weight:600}.toc-n{font-family:ui-monospace,Consolas,monospace;font-size:11px;padding-top:3px;opacity:.65}.nav{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.96);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}.nav-inner{max-width:1280px;margin:0 auto;padding:0 24px;height:64px;gap:24px}.nav-brand,.nav-inner{display:flex;align-items:center}.nav-brand{gap:10px;color:var(--ink);text-decoration:none;white-space:nowrap}.nav-mark{width:32px;height:32px;overflow:hidden}.nav-mark i:nth-child(3){height:19px;background:var(--orange)}.nav-brand-copy b{font-weight:700}.nav-brand-copy small{font:500 8px/1.1 ui-monospace,SFMono-Regular,Consolas,monospace}.nav-links{margin-left:auto;display:flex;align-items:center;gap:2px;font-size:13px}.nav-links a{padding:7px 11px;border-radius:4px;color:var(--muted);text-decoration:none}.nav-links a:hover,.nav-links a[aria-current=page]{color:var(--ink);background:var(--code-bg)}.nav-links a[aria-current=page]{font-weight:600}.nav-links .nav-signin{margin-left:8px;color:var(--ink);font-weight:600}.nav-links .nav-signin:hover{color:var(--accent)}.nav-burger{display:none;margin-left:auto;flex-direction:column;gap:4px;background:none;border:1px solid var(--line);border-radius:4px;padding:8px 9px;cursor:pointer}.nav-burger span{display:block;width:16px;height:1.5px;background:var(--ink)}@media(max-width:720px){.nav-burger{display:flex}.nav-links{position:absolute;top:64px;left:0;right:0;margin:0;display:none;flex-direction:column;align-items:stretch;gap:2px;padding:12px 16px 16px;background:var(--panel);border-bottom:1px solid var(--line)}.nav-links.open{display:flex}.nav-links .nav-signin{margin-left:0}}.progress{position:sticky;top:58px;z-index:45;height:2px;background:transparent}.progress span{display:block;height:100%;background:var(--accent);transition:width .08s linear}.shell{max-width:1300px;margin:0 auto;padding:34px 22px 90px;display:grid;gap:40px;grid-template-columns:232px minmax(0,1fr)}.shell.home{max-width:1040px;grid-template-columns:minmax(0,1fr)}.shell:not(.home){padding-bottom:48px}.toc{position:sticky;top:78px;align-self:start;margin-top:40px;max-height:calc(100vh - 138px);overflow-y:auto;padding:4px 0}.shell:not(.home) main{gap:14px}@media(max-width:920px){.shell{grid-template-columns:minmax(0,1fr);gap:0;padding-top:24px}.toc{position:static;order:-1;max-height:none;margin:0 0 18px;padding:10px 0 11px;border:0;border-bottom:1px solid var(--line);border-radius:0;background:transparent}.toc-toggle{margin:0;padding:0 3px;font-size:11.5px}.toc ol{margin-top:10px;padding:9px 5px 3px 8px;border-left:2px solid var(--line)}}.crumb{display:flex;gap:9px;align-items:center;font-size:12.5px;margin:0;flex-wrap:wrap}.crumb,.crumb a{color:var(--muted)}.crumb a{text-decoration:none}.crumb a:hover{color:var(--accent)}.crumb span[aria-current]{color:var(--ink)}.art-head{margin:0 0 6px}.art-meta{display:flex;gap:14px;align-items:center;flex-wrap:wrap;margin:0 0 14px;font-size:12px;color:var(--muted);font-family:ui-monospace,Consolas,monospace}.art-n{font-weight:650}.art-chip,.art-n{color:var(--accent)}.art-chip{border-radius:99px;padding:2px 10px;font-weight:600}.art-chip,.lead{background:var(--accent-soft)}.lead{color:var(--muted);border-left:3px solid var(--accent);padding:16px 20px;border-radius:0 10px 10px 0;margin:0 0 30px;font-size:14.5px;line-height:1.8}.hero{margin:0 0 46px}.hero .eyebrow{font-size:11.5px;letter-spacing:.16em;color:var(--accent);font-family:ui-monospace,Consolas,monospace;margin:0 0 14px}.hero h1{font-size:clamp(28px,4.4vw,40px);line-height:1.3;margin:0 0 16px}.hero-lead{font-size:16.5px;max-width:46em;margin:0 0 22px;color:var(--ink)}.hero-stats{display:flex;gap:26px;flex-wrap:wrap;margin:0 0 26px;font-size:13px;color:var(--muted)}.hero-stats b{color:var(--accent);font-size:19px;font-weight:650;margin-right:5px;font-family:ui-monospace,Consolas,monospace}.hero-cta{display:flex;gap:12px;flex-wrap:wrap;margin:0}.btn{display:inline-block;background:var(--accent);border-radius:99px;padding:10px 22px;font-size:14px;font-weight:600}.btn:hover{filter:brightness(1.08)}.btn.ghost{background:transparent;color:var(--muted);border:1px solid var(--line)}.btn.ghost:hover{border-color:var(--accent);filter:none}.dot{display:inline-block;width:6px;height:6px;border-radius:50%;background:var(--accent);margin-left:8px;vertical-align:middle}@media(max-width:700px){.group h2{font-size:20px}}.pager{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-top:6px;padding:0;border:0}.pager a{display:flex;flex-direction:column;gap:5px;padding:16px 18px;text-decoration:none;border:0;border-left:3px solid var(--line);border-radius:0 10px 10px 0;color:var(--ink);background:color-mix(in srgb,var(--panel) 72%,transparent);max-width:none}.pager a:hover{border-left-color:var(--accent);background:var(--accent-soft)}.pager-next{text-align:right}.pager.single .pager-next{grid-column:2}.pager.single .pager-prev{grid-column:1}.pager-dir{font-size:11.5px;color:var(--accent);font-family:ui-monospace,Consolas,monospace}.pager-title{font-size:14px;line-height:1.6}@media(max-width:640px){.pager{grid-template-columns:1fr}.pager-next{text-align:left}.pager.single .pager-next,.pager.single .pager-prev{grid-column:1}}.foot{border-top:1px solid var(--line);background:var(--panel);margin-top:20px}.foot-inner{max-width:1240px;margin:0 auto;padding:44px 22px 30px;display:grid;grid-template-columns:minmax(0,1.2fr) minmax(0,1fr);gap:44px}@media(max-width:720px){.foot-inner{grid-template-columns:1fr;gap:30px}}.foot-title{font-family:"Noto Serif SC",Songti SC,Georgia,serif;font-weight:650;font-size:15px;margin:0 0 8px}.foot-brand p{margin:0;color:var(--muted);font-size:13px;line-height:1.8;max-width:38em}.foot-cols{display:grid;grid-template-columns:1fr 1fr;gap:30px}.foot-h{font-size:11px;letter-spacing:.16em;color:var(--muted);font-family:ui-monospace,Consolas,monospace;margin:0 0 12px}.foot-cols ul{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:8px}.foot-cols a{color:var(--muted);text-decoration:none;font-size:13px;line-height:1.5}.foot-cols a:hover{color:var(--accent)}.foot-bottom{max-width:1240px;margin:0 auto;padding:0 22px 40px;color:var(--muted);font-size:12px}.totop{position:fixed;right:20px;bottom:20px;z-index:40;width:40px;height:40px;border-radius:50%;border:1px solid var(--line);background:var(--panel);color:var(--muted);cursor:pointer;font-size:16px;opacity:0;pointer-events:none;transition:opacity .18s}.totop.show{opacity:1;pointer-events:auto}.totop:hover{color:var(--accent);border-color:var(--accent)}.notfound{text-align:center;padding:70px 30px}.notfound .eyebrow{font-family:ui-monospace,Consolas,monospace;color:var(--accent);letter-spacing:.2em;margin:0 0 12px}.legal-shell{max-width:880px}.legal-shell article{padding:48px}.legal-updated{color:var(--muted);font-size:13px}@media(max-width:640px){.legal-shell article{padding:28px 20px}}.platform-home{max-width:1180px;padding-top:0}.platform-hero{padding:88px 0 68px;position:relative;overflow:hidden}.platform-hero:after{content:"";position:absolute;right:2%;top:52px;width:280px;height:280px;border-radius:50%;background:radial-gradient(circle,var(--accent-soft) 0,transparent 68%);filter:blur(4px);pointer-events:none}.platform-hero h1{position:relative;z-index:1;font-size:clamp(42px,7vw,76px);line-height:1.08;letter-spacing:-.045em;margin:12px 0 24px;max-width:950px}.platform-hero h1 span{color:var(--accent)}.platform-lead{font-size:18px;line-height:1.9;color:var(--muted);max-width:720px;margin:0 0 30px}.platform-metrics{display:flex;gap:34px;flex-wrap:wrap;border-top:1px solid var(--line);margin-top:62px;padding-top:24px;color:var(--muted);font-size:13px}.platform-metrics strong{display:block;color:var(--ink);font:650 24px/1.2 ui-monospace,Consolas,monospace;margin-bottom:4px}.platform-section{padding:70px 0}.section-heading{display:flex;justify-content:space-between;gap:24px;align-items:end;margin-bottom:28px}.platform-cta h2,.platform-feature h2,.platform-steps h2,.section-heading h2{font-size:clamp(28px,4vw,42px);line-height:1.25;margin:7px 0 0;letter-spacing:-.025em}.section-heading>a,.text-link{color:var(--accent);text-decoration:none;font-weight:600;white-space:nowrap}.pathway-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.pathway-card{position:relative;min-height:310px;padding:26px;border:1px solid var(--line);border-radius:16px;background:var(--panel);text-decoration:none;color:var(--ink);transition:.2s ease;overflow:hidden}.pathway-card:hover{transform:translateY(-4px);border-color:color-mix(in srgb,var(--accent) 55%,var(--line));box-shadow:0 18px 45px color-mix(in srgb,var(--ink) 8%,transparent)}.pathway-index{position:absolute;right:20px;top:15px;font:700 54px/1 ui-monospace,Consolas,monospace;color:color-mix(in srgb,var(--accent) 12%,transparent)}.pathway-state{font-size:11px;letter-spacing:.14em;text-transform:uppercase;color:var(--accent);margin:0 0 34px}.pathway-card h3{font-size:24px;margin:0 0 12px}.pathway-card>p:not(.pathway-state){color:var(--muted);line-height:1.75;margin:0 0 20px}.tag-row{display:flex;gap:7px;flex-wrap:wrap}.tag-row i{font-style:normal;font-size:11px;padding:5px 8px;border-radius:99px;background:var(--accent-soft);color:var(--muted)}.pathway-more{position:absolute;left:26px;bottom:24px;color:var(--accent);font-size:13px}.pathway-more b{font-size:16px}.platform-feature{margin:40px 0 54px;padding:54px;display:grid;grid-template-columns:1fr 1fr;gap:52px;align-items:center;border-radius:20px;background:linear-gradient(135deg,var(--panel),var(--accent-soft));border:1px solid var(--line)}.platform-feature p{color:var(--muted);line-height:1.8}.signal-demo{height:230px;display:flex;align-items:center;justify-content:center;gap:5px;padding:24px;border-radius:14px;background:color-mix(in srgb,var(--bg) 76%,transparent);border:1px solid var(--line)}.signal-demo i{display:block;width:5px;min-height:8px;border-radius:99px;background:linear-gradient(to top,var(--accent),color-mix(in srgb,var(--accent) 35%,white));opacity:.78}.platform-steps{text-align:center}.step-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:30px;margin-top:36px;text-align:left}.step-grid article{border-top:2px solid var(--accent);padding:22px 4px}.step-grid span{font:600 12px ui-monospace,Consolas,monospace;color:var(--accent)}.step-grid h3{font-size:20px;margin:14px 0 8px}.step-grid p{color:var(--muted);line-height:1.75;margin:0}.platform-cta{text-align:center;margin:50px 0 80px;padding:62px 28px;border:1px solid var(--line);border-radius:20px;background:var(--panel)}.platform-cta p:not(.eyebrow){color:var(--muted);margin:14px 0 26px}@media(max-width:820px){.pathway-grid,.platform-feature,.step-grid{grid-template-columns:1fr}.platform-feature{padding:34px}.signal-demo{height:170px}.platform-hero{padding-top:58px}.platform-metrics{gap:22px}.section-heading{align-items:start}.section-heading>a{display:none}}.account-shell,.directory-shell,.roadmap-shell{max-width:1100px;padding-top:62px}.directory-hero{max-width:760px;margin-bottom:48px}.directory-hero h1{font-size:clamp(38px,6vw,62px);margin:8px 0 16px;letter-spacing:-.04em}.directory-hero>p:last-child{font-size:17px;line-height:1.85;color:var(--muted)}.course-catalog{display:grid;gap:18px;margin-bottom:70px}.course-product{display:grid;grid-template-columns:230px 1fr;gap:32px;padding:28px;border:1px solid var(--line);border-radius:18px;background:var(--panel)}.course-cover{min-height:220px;border-radius:13px;background:linear-gradient(145deg,var(--accent-soft),color-mix(in srgb,var(--accent) 28%,var(--panel)));display:grid;place-items:center;position:relative;overflow:hidden}.course-cover>span{font:700 84px/1 ui-monospace,Consolas,monospace;color:color-mix(in srgb,var(--accent) 40%,transparent)}.mini-wave{position:absolute;bottom:24px;letter-spacing:.15em;color:var(--accent);font-size:28px}.course-copy h2{font-size:28px;margin:7px 0 12px}.course-copy>p:not(.eyebrow){color:var(--muted);line-height:1.8}.course-copy ul{display:flex;gap:18px;flex-wrap:wrap;padding:0;list-style:none;color:var(--muted);font-size:13px}.course-product.is-planned{grid-template-columns:140px 1fr;opacity:.78}.course-product.is-planned .course-cover{min-height:140px}.course-product.is-planned .course-cover>span{font-size:54px}.course-detail{max-width:1040px}.course-detail .hero{padding-top:44px}.roadmap-line{position:relative;margin:20px 0 80px}.roadmap-line:before{content:"";position:absolute;left:27px;top:30px;bottom:30px;width:1px;background:var(--line)}.roadmap-stage{display:grid;grid-template-columns:56px 1fr;gap:26px;position:relative;margin:0 0 34px}.roadmap-node{z-index:1;width:56px;height:56px;display:grid;place-items:center;background:var(--bg);border:2px solid var(--accent);color:var(--accent);font:650 13px ui-monospace,Consolas,monospace}.roadmap-stage>div{padding:8px 0 24px}.roadmap-stage h2{font-size:25px;margin:5px 0}.roadmap-stage>div>p:not(.eyebrow){color:var(--muted);font-size:13px}.roadmap-lessons{display:grid;grid-template-columns:repeat(2,1fr);gap:8px;margin-top:18px}.roadmap-lessons a{padding:11px 13px;border:1px solid var(--line);border-radius:9px;text-decoration:none;color:var(--ink);font-size:13px;background:var(--panel)}.roadmap-lessons a:hover{border-color:var(--accent);color:var(--accent)}.roadmap-lessons b{font:600 11px ui-monospace,Consolas,monospace;margin-right:9px;color:var(--accent)}.lab-directory{display:grid;grid-template-columns:repeat(2,1fr);gap:14px;margin-bottom:70px}.lab-directory>a{display:grid;grid-template-columns:44px 1fr;gap:15px;position:relative;padding:23px;border:1px solid var(--line);border-radius:14px;text-decoration:none;color:var(--ink);background:var(--panel)}.lab-directory>a:hover{border-color:var(--accent)}.lab-directory>a>span{font:600 13px ui-monospace,Consolas,monospace;color:var(--accent)}.lab-directory h2{font-size:19px;margin:0 0 8px}.lab-directory p{line-height:1.65;margin:0 0 12px;font-size:14px}.lab-directory p,.lab-directory small{color:var(--muted)}.lab-directory>a>b{grid-column:2;color:var(--accent);font-size:12px}.account-shell>main{display:grid;grid-template-columns:minmax(0,1.1fr) minmax(280px,.9fr);gap:22px;margin-bottom:80px}.auth-benefits,.auth-card{border:1px solid var(--line);border-radius:18px;background:var(--panel);padding:38px}.auth-card h1{font-size:36px;margin:7px 0 14px}.auth-benefits>p:not(.eyebrow),.auth-card>p:not(.eyebrow){color:var(--muted);line-height:1.8}.auth-provider{width:100%;display:flex;align-items:center;justify-content:space-between;margin:28px 0 16px;padding:15px 18px;border:1px solid color-mix(in srgb,#07c160 55%,var(--line));border-radius:10px;background:color-mix(in srgb,#07c160 9%,var(--panel));color:var(--ink);font:inherit;cursor:pointer}.auth-provider b{color:#07a951}.auth-provider span{font-size:13px;color:var(--muted)}.auth-provider.is-disabled{cursor:not-allowed;opacity:.7}.auth-divider{display:flex;align-items:center;gap:12px;color:var(--muted);font-size:11px;margin:22px 0}.auth-divider:after,.auth-divider:before{content:"";height:1px;flex:1 1;background:var(--line)}.auth-coming{display:flex;gap:8px;flex-wrap:wrap}.auth-coming span{flex:1 1;min-width:100px;text-align:center;border:1px solid var(--line);border-radius:9px;padding:10px;color:var(--muted);font-size:12px}.auth-note{font-size:11px!important;margin-top:26px}.auth-note a{margin:0 .2em}.auth-benefits h2{font-size:25px;line-height:1.4}.auth-benefits li{margin:12px 0;color:var(--muted)}.text-button{border:0;background:none;padding:0;color:var(--muted);font:inherit;cursor:pointer;text-decoration:underline}.auth-status{display:flex;flex-direction:column;align-items:flex-start;gap:8px;margin:28px 0 16px;padding:18px;border:1px solid var(--line);border-radius:4px;background:var(--code-bg)}.auth-status b{font-size:14px}.auth-status span{color:var(--muted);font-size:13px;line-height:1.7}.auth-status .btn{margin-top:4px}@media(max-width:760px){.course-product,.course-product.is-planned{grid-template-columns:1fr}.course-cover{min-height:150px}.account-shell>main,.lab-directory,.roadmap-lessons{grid-template-columns:1fr}.auth-benefits,.auth-card{padding:28px 22px}}.lightbox{position:fixed;inset:0;z-index:100;display:grid;place-items:center;background:rgba(8,12,18,.86);padding:24px;cursor:zoom-out;-webkit-backdrop-filter:blur(3px);backdrop-filter:blur(3px)}.lightbox img{max-width:min(1600px,96vw);max-height:94vh;width:auto;height:auto;background:#fff;border-radius:10px;padding:10px;cursor:default;box-shadow:0 20px 60px rgba(0,0,0,.4)}.lightbox-close{position:absolute;top:18px;right:20px;width:38px;height:38px;border-radius:99px;border:1px solid rgba(255,255,255,.28);background:rgba(255,255,255,.08);color:#fff;font-size:15px;cursor:pointer;line-height:1}.lightbox-close:hover{background:rgba(255,255,255,.18)}.art-chip,.art-meta,.art-n,.device-specs,.eyebrow,.group-range,.hardware-tag,.lesson-n,.module-meta,.pager-dir,.status-strip{font-family:ui-monospace,SFMono-Regular,Consolas,monospace;letter-spacing:0;font-feature-settings:"tnum";font-variant-numeric:tabular-nums}.eyebrow{margin:0;color:var(--accent);font-size:11px;font-weight:700;text-transform:uppercase}.btn{display:inline-flex;align-items:center;justify-content:center;min-height:40px;padding:9px 18px;border:1px solid var(--ink);border-radius:4px;background:var(--ink);color:#fff;text-decoration:none;font-size:13px;font-weight:650;box-shadow:none;transition:background .18s ease,border-color .18s ease,color .18s ease}.btn:hover{background:#2d3136;border-color:#2d3136;filter:none}.btn.ghost{background:var(--panel);border-color:var(--line-strong);color:var(--ink)}.btn.ghost:hover{background:var(--code-bg);border-color:var(--muted);color:var(--ink)}.section-link,.text-link{color:var(--accent);text-decoration:none;font-weight:650}.section-link:hover,.text-link:hover{text-decoration:underline}.nav-mark{display:flex;align-items:center;justify-content:center;gap:2px;width:34px;min-width:34px;height:34px;padding:0;border:1px solid #2c323b;border-radius:3px;background:var(--dark-panel)}.nav-mark i{display:block;width:2px;background:var(--accent)}.nav-mark i:first-child,.nav-mark i:nth-child(5){height:7px}.nav-mark i:nth-child(2),.nav-mark i:nth-child(4){height:13px}.nav-mark i:nth-child(3){height:20px}.nav-brand-copy{display:flex;flex-direction:column;gap:2px}.nav-brand-copy b{font-size:14px;line-height:1.1}.nav-brand-copy small{color:var(--muted);font:500 8px/1 ui-monospace,Consolas,monospace}.nav-links .nav-start{margin-left:2px;border:1px solid var(--ink);border-radius:4px;background:var(--ink);color:#fff;font-weight:650}.nav-links .nav-start:hover{border-color:#2d3136;background:#2d3136;color:#fff}.progress{top:64px}.instrument-home{background:#fff;color:var(--ink)}.instrument-home main{display:block}.home-container{width:min(1280px,calc(100% - 48px));margin:0 auto}.status-strip{border-bottom:1px solid var(--line);background:var(--code-bg);font-size:10px;color:var(--muted)}.status-strip-inner{min-height:29px;display:flex;align-items:center;justify-content:space-between;gap:18px}.live-state,.status-ready{display:flex;align-items:center;gap:7px;color:var(--ink);font-weight:650}.hero-proof i,.live-state i,.status-ready i,.synth-readout i{display:block;width:6px;height:6px;border-radius:50%;background:var(--accent)}.status-edition{color:var(--accent);font-weight:700}.instrument-hero{padding:52px 0 48px;background:#fff}.hero-grid{display:grid;grid-template-columns:minmax(0,.95fr) minmax(480px,1.05fr);gap:64px;align-items:center}.hero-copy{min-width:0}.hardware-tag{display:inline-flex;align-items:center;gap:8px;margin:0 0 26px;padding:6px 9px;border:1px solid var(--line);border-radius:3px;background:var(--bg);font-size:10px;color:var(--muted)}.hardware-tag span{color:var(--ink);font-weight:700}.hardware-tag i{width:5px;height:5px;border-radius:50%;background:var(--orange)}.hero-copy>.eyebrow{margin-bottom:8px}.hero-copy h1{margin:0;font-size:clamp(46px,5.3vw,70px);line-height:1.08;font-weight:720}.hero-copy h1 span{color:var(--accent)}.hero-statement{max-width:36rem;margin:18px 0 0;font-size:20px;line-height:1.55;font-weight:650;color:var(--ink)}.hero-description{max-width:36rem;margin:22px 0 0;color:var(--muted);font-size:17px;line-height:1.8}.hero-actions{align-items:center;gap:10px;margin-top:26px}.hero-actions,.hero-proof{display:flex;flex-wrap:wrap}.hero-proof{gap:12px 22px;margin-top:28px;padding-top:18px;border-top:1px solid var(--line);color:var(--muted);font-size:11px;font-family:ui-monospace,SFMono-Regular,Consolas,monospace}.hero-proof span{display:flex;align-items:center;gap:7px}.hero-proof i{width:5px;height:5px}.instrument-showcase{min-width:0;padding:12px;border:1px solid var(--line);border-radius:6px;background:#fff}.showcase-label{min-height:30px;display:flex;align-items:center;justify-content:space-between;gap:12px;padding:0 5px 9px;color:var(--muted);font:600 9px/1.2 ui-monospace,SFMono-Regular,Consolas,monospace}.live-state{color:var(--accent);font-size:9px}.live-state i{width:5px;height:5px}.synth-frame{position:relative;overflow:hidden;width:100%;aspect-ratio:16/10;border:1px solid var(--line);border-radius:4px;background:var(--code-bg)}.synth-frame img{object-fit:cover}.synth-readout{position:absolute;left:12px;bottom:12px;display:flex;align-items:center;gap:7px;padding:6px 9px;border:1px solid #303640;border-radius:3px;background:rgba(24,27,32,.92);color:#dfe5ea;font:500 9px/1.2 ui-monospace,SFMono-Regular,Consolas,monospace}.synth-readout i{background:var(--orange)}.device-specs{display:grid;grid-template-columns:repeat(3,1fr);gap:7px;margin-top:9px}.device-specs span{min-width:0;padding:8px;text-align:center;border:1px solid var(--line);border-radius:3px;background:var(--bg)}.device-specs small{display:block;color:var(--muted);font-size:8px}.device-specs b{display:block;margin-top:2px;font-size:9px;color:var(--ink);white-space:nowrap}.benefit-band{padding:26px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line);background:var(--bg)}.benefit-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:10px}.benefit-module{display:flex;flex-direction:column;padding:22px 20px;border-radius:4px;background:#fff}.module-meta{display:flex;justify-content:space-between;gap:8px;color:var(--muted);font-size:9px}.module-meta span:first-child{color:var(--accent);font-weight:700}.benefit-icon{display:grid;place-items:center;width:40px;height:40px;border-radius:50%;background:var(--accent-soft);color:var(--accent)}.benefit-icon svg{width:22px;height:22px;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}.benefit-module h2{margin:16px 0 8px;padding-top:0;border-top:0;font-size:18px;line-height:1.45}.benefit-module p{margin:0;color:var(--muted);font-size:14px;line-height:1.75}.home-section{padding:72px 0;background:#fff}.home-section-heading{display:flex;align-items:end;justify-content:space-between;gap:40px;margin-bottom:28px}.home-section-heading h2{max-width:760px;margin:7px 0 8px;font-size:clamp(28px,3.5vw,42px);line-height:1.24}.home-section-heading p:not(.eyebrow){margin:0;color:var(--muted);font-size:14px}.section-link{flex:0 0 auto;font-size:12px}.learning-domains{border-bottom:1px solid var(--line)}.domain-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.domain-module{display:flex;flex-direction:column;padding:22px;border:1px solid var(--line);border-radius:4px;background:#fff;color:var(--ink);text-decoration:none;transition:border-color .18s ease,background .18s ease}.domain-module:hover{border-color:var(--accent);background:#fbfdfe}.domain-top{display:flex;align-items:center;justify-content:space-between;margin-bottom:18px}.domain-status{padding:2px 10px;border-radius:999px;background:var(--code-bg);color:var(--muted);font-size:12px;font-weight:600}.domain-status.is-live{background:var(--accent-soft);color:var(--accent-strong)}.domain-module h3{margin:0 0 8px;font-size:22px}.domain-module p{margin:0;color:var(--muted);font-size:14px;line-height:1.75}.domain-module>b{margin-top:auto;padding-top:20px;color:var(--accent);font-size:14px}.lab-preview-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.lab-module{display:flex;min-width:0;min-height:480px;flex-direction:column;padding:13px;border:1px solid var(--line);border-radius:4px;background:#fff;color:var(--ink);text-decoration:none;transition:border-color .18s ease,background .18s ease}.lab-module:hover{border-color:var(--accent);background:#fbfdfe}.scope-screen{height:218px;margin:12px 0 0;overflow:hidden;border:1px solid #2c323b;border-radius:3px;background:var(--dark-panel);color:#aab3bc;font-family:ui-monospace,SFMono-Regular,Consolas,monospace}.scope-footer,.scope-toolbar{height:28px;display:flex;align-items:center;justify-content:space-between;gap:10px;padding:0 10px;border-bottom:1px solid #303640;background:#1e2228;font-size:8px}.scope-toolbar b{display:flex;align-items:center;gap:5px;color:#68d5df;font-size:8px}.scope-toolbar b i{width:5px;height:5px;border-radius:50%;background:#68d5df;box-shadow:0 0 7px rgba(104,213,223,.7)}.scope-viewport{position:relative;height:160px;overflow:hidden;background-color:#15191e;background-image:linear-gradient(rgba(255,255,255,.055) 1px,transparent 0),linear-gradient(90deg,rgba(255,255,255,.055) 1px,transparent 0);background-size:32px 32px}.scope-viewport:after,.scope-viewport:before{content:"";position:absolute;z-index:1;background:rgba(255,255,255,.13)}.scope-viewport:before{left:0;right:0;top:50%;height:1px}.scope-viewport:after{top:0;bottom:0;left:50%;width:1px}.scope-viewport svg{position:absolute;z-index:2;inset:8px 16px 14px;width:calc(100% - 32px);height:calc(100% - 22px);overflow:visible}.scope-viewport path{fill:none;vector-effect:non-scaling-stroke}.scope-axis{stroke:rgba(255,255,255,.08);stroke-width:1}.scope-wave-a{stroke:#58c8d2;stroke-width:2}.scope-wave-b{stroke:#ff994d;stroke-width:1.5;opacity:.9}.scope-x-left,.scope-x-right,.scope-y-bottom,.scope-y-top{position:absolute;z-index:4;color:#6f7a85;font-size:7px;line-height:1}.scope-y-top{left:5px;top:6px}.scope-y-bottom{left:5px;bottom:6px}.scope-x-left{left:17px;bottom:5px}.scope-x-right{right:7px;bottom:5px}.scope-footer{height:29px;border-top:1px solid #303640;border-bottom:0;color:#7f8a94}.scope-footer b{color:var(--orange);font-size:8px}.scope-spectrum-bars{position:absolute;z-index:2;inset:18px 21px 19px;display:flex;align-items:end;gap:5px;border-bottom:1px solid rgba(255,255,255,.18)}.scope-spectrum-bars i{display:block;flex:1 1;min-width:2px;background:#51c3cf;border-top:1px solid #a4edf1;box-shadow:0 0 6px rgba(81,195,207,.12)}.scope-spectrum-bars i:nth-child(4n){background:#f58a3d;border-top-color:#ffc18f}.scope-spectrogram-grid{position:absolute;z-index:2;inset:15px 20px 18px;display:grid;grid-template-columns:repeat(12,1fr);grid-template-rows:repeat(6,1fr);gap:3px;transform:scaleY(-1)}.scope-spectrogram-grid i{display:block;background:#4bc0ca;box-shadow:0 0 7px rgba(75,192,202,.28)}.scope-spectrogram-grid i:nth-child(11n),.scope-spectrogram-grid i:nth-child(5n){background:#f28a42}.scope-controls{height:48px;display:grid;grid-template-columns:1fr 34px 1fr 30px;align-items:center;gap:9px;margin:0 0 18px;padding:7px 10px;border:1px solid var(--line);border-top:0;border-radius:0 0 3px 3px;background:var(--code-bg);font-family:ui-monospace,SFMono-Regular,Consolas,monospace}.scope-controls>span:not(.scope-switch){display:flex;min-width:0;flex-direction:column}.scope-controls small{color:var(--muted);font-size:7px}.scope-controls b{overflow:hidden;color:var(--ink);font-size:9px;text-overflow:ellipsis;white-space:nowrap}.scope-knob{position:relative;display:block;width:27px;height:27px;border:1px solid #aab0b5;border-radius:50%;background:linear-gradient(135deg,#f7f8f8,#b9bec2);box-shadow:inset 0 0 0 4px #d8dcdf}.scope-knob u{position:absolute;left:12px;top:3px;width:1px;height:7px;background:var(--ink);text-decoration:none;transform:rotate(25deg);transform-origin:50% 10px}.scope-switch{display:flex;width:26px;height:14px;align-items:center;padding:2px;border:1px solid #aeb4b9;border-radius:2px;background:#d9dcde}.scope-switch i{display:block;width:10px;height:8px;margin-left:auto;background:var(--orange)}.lab-module h3{margin:0 0 7px;font-size:18px}.lab-module p{margin:0;color:var(--muted);font-size:13px;line-height:1.7}.lab-module>b{margin-top:auto;padding-top:12px;color:var(--accent);font-size:11px}.curriculum{border-top:1px solid var(--line);border-bottom:1px solid var(--line);background:var(--bg)}.curriculum-heading{align-items:center}.hero-cta del{color:var(--muted);text-decoration-thickness:1px}.phase-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}.phase-module{padding:20px;border-radius:4px}.phase-module h3{margin:24px 0 8px;font-size:19px}.phase-module>p{min-height:68px;margin:0;color:var(--muted);font-size:13px;line-height:1.7}.phase-module ol{list-style:none;margin:18px 0 0;padding:0;border-top:1px solid var(--line)}.phase-module li{display:flex;gap:12px;margin:0;padding:9px 0;border-bottom:1px solid var(--line);font-size:12px}.phase-module li span{color:var(--accent);font-family:ui-monospace,Consolas,monospace}.author-section{background:#fff}.author-panel{display:grid;grid-template-columns:minmax(220px,.65fr) minmax(0,1.35fr);gap:48px;padding:28px;border:1px solid var(--line);border-radius:4px;background:var(--bg)}.author-id{min-height:230px;display:flex;flex-direction:column;align-items:center;justify-content:center;border:1px solid var(--line-strong);border-radius:3px;background:var(--dark-panel);color:#fff}.author-id span{font:700 54px/1 ui-monospace,Consolas,monospace;color:var(--accent)}.author-id small{margin-top:18px;color:#99a4ae;font:500 9px/1 ui-monospace,Consolas,monospace}.author-copy{align-self:center;max-width:720px}.author-copy h2{margin:8px 0 14px;font-size:clamp(24px,3vw,34px);line-height:1.35}.author-copy>p:not(.eyebrow){color:var(--muted);font-size:14px;line-height:1.85}.author-copy .section-link{display:inline-block;margin-top:10px}.final-cta{padding:50px 0;background:var(--dark-panel);color:#fff}.final-cta-inner{display:flex;align-items:center;justify-content:space-between;gap:42px;padding:26px;border:1px solid #2c323b;border-radius:4px;background:#1e2228}.final-cta h2{margin:6px 0 7px;font-size:26px}.final-cta p:not(.eyebrow){margin:0;color:#aab3bc;font-size:13px}.final-cta .eyebrow{color:#55c4ce}.final-cta .hero-actions{margin:0;justify-content:flex-end}.final-cta .btn{background:var(--accent);border-color:var(--accent)}.final-cta .btn:hover{background:var(--accent-strong);border-color:var(--accent-strong)}.final-cta .btn.inverse{background:transparent;border-color:#3d444d;color:#fff}.final-cta .btn.inverse:hover{background:#292e35}.shell{padding-left:24px;padding-right:24px}.shell.home{max-width:1120px}.group{border-left:0;border:1px solid var(--line);border-radius:4px;background:var(--panel)}.group h2{background:var(--bg);border-bottom:1px solid var(--line);border-radius:0}.lesson-list{padding:7px}.lesson-list a{border-radius:3px}.lesson-list a:hover{background:var(--code-bg)}.art-chip{border-radius:3px}.lab{background:var(--code-bg)}.anim canvas,.katex-display,.lab,.lab-canvas canvas,.prose .audio-preview,.prose img,.table-wrap,pre{border-radius:4px}.toc a{border-radius:3px}.pager a{border-radius:0 4px 4px 0}.foot{margin-top:0;background:#fff}.foot-title{font-family:inherit}.foot-h{letter-spacing:0}.foot-bottom{border-top:1px solid var(--line);padding-top:18px}.directory-hero h1,.platform-cta h2,.platform-feature h2,.platform-hero h1,.platform-steps h2,.section-heading h2{letter-spacing:0}.auth-benefits,.auth-card,.course-cover,.course-product,.lab-directory>a,.pathway-card,.platform-cta,.platform-feature{border-radius:4px;box-shadow:none}.pathway-card:hover{transform:none;box-shadow:none;background:var(--bg)}.course-cover{background:var(--code-bg)}.course-cover>span{color:color-mix(in srgb,var(--accent) 42%,transparent)}.mini-wave{letter-spacing:0}.roadmap-node{border-radius:50%}.roadmap-lessons a{border-radius:3px}.auth-coming span,.auth-provider,.totop{border-radius:4px}@media(max-width:960px){.hero-grid{grid-template-columns:1fr;gap:34px}.instrument-showcase{max-width:720px;width:100%}.benefit-grid{grid-template-columns:repeat(2,1fr)}.domain-grid,.lab-preview-grid,.phase-grid{grid-template-columns:1fr}.phase-module>p{min-height:0}.lab-module{min-height:470px}.author-panel{grid-template-columns:220px 1fr}}@media(max-width:720px){.home-container{width:min(100% - 32px,1280px)}.status-strip-inner{min-height:36px;justify-content:flex-start}.status-strip-inner>span:nth-child(2){display:none}.status-edition{margin-left:auto}.instrument-hero{padding:34px 0 28px}.hero-grid{gap:26px}.hardware-tag{margin-bottom:18px}.hero-copy h1{font-size:40px}.hero-statement{font-size:18px;margin-top:14px}.hero-description{font-size:15px;margin-top:12px}.hero-actions,.hero-proof{margin-top:20px}.hero-proof{padding-top:14px}.hero-proof span:last-child{display:none}.instrument-showcase{padding:9px}.synth-readout{left:8px;bottom:8px}.device-specs span{padding:7px 4px}.device-specs b{font-size:7px}.benefit-grid{grid-template-columns:1fr}.benefit-module{min-height:0}.home-section{padding:52px 0}.home-section-heading{display:block}.home-section-heading .section-link{display:inline-block;margin-top:16px}.scope-screen{height:210px}.scope-viewport{height:152px}.curriculum-heading{display:flex;align-items:flex-start;flex-direction:column}.author-panel{grid-template-columns:1fr;gap:26px;padding:18px}.author-id{min-height:150px}.final-cta-inner{align-items:flex-start;flex-direction:column}.final-cta .hero-actions{justify-content:flex-start}.nav-brand-copy small{display:none}.nav-inner{padding:0 16px}.nav-links{top:64px}.nav-links .nav-start{margin-left:0}.shell{padding-left:16px;padding-right:16px}}@media(max-width:420px){.hero-copy h1{font-size:36px}.hero-actions .btn{flex:1 1}.hero-proof{gap:9px 14px}.showcase-label>span:first-child{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.synth-readout{font-size:7px}}@media(prefers-reduced-motion:reduce){.btn,.lab-module{transition:none}}.auth-email{display:flex;flex-direction:column;gap:8px;margin:24px 0 8px}.auth-email label{font-size:13px;color:var(--muted)}.auth-email input{font:inherit;padding:11px 13px;border:1px solid var(--line-strong);border-radius:4px;background:var(--panel);color:var(--ink)}.auth-email input:focus{outline:2px solid var(--accent);outline-offset:1px}.auth-email .btn{align-self:flex-start;cursor:pointer}.auth-error{color:var(--orange)!important;font-size:14px}.comments{background:var(--panel);border:1px solid var(--line);border-radius:4px;padding:32px 48px}@media(max-width:640px){.comments{padding:22px 20px}}.comments h2{font-size:20px;margin:0 0 18px}.comments h2 small{color:var(--muted);font-weight:400;margin-left:6px;font-size:15px}.comments-empty,.comments-signin{color:var(--muted);font-size:14px;margin:0 0 8px}.comment-form{display:flex;flex-direction:column;gap:8px;margin-bottom:22px}.comment-form.is-reply{margin:8px 0 4px;width:100%}.comment-form textarea{font:inherit;font-size:15px;line-height:1.7;padding:11px 13px;border:1px solid var(--line-strong);border-radius:4px;background:var(--panel);color:var(--ink);resize:vertical;min-height:52px}.comment-form textarea:focus{outline:2px solid var(--accent);outline-offset:1px}.comment-form-foot{display:flex;align-items:center;justify-content:flex-end;gap:14px}.comment-form-foot>span{margin-right:auto;font-size:12px;color:var(--muted)}.comment-form-foot .comment-error{color:var(--orange)}.comment-form .btn{cursor:pointer}.comment-form .btn:disabled{opacity:.5;cursor:default}.comment-list,.comment-replies{list-style:none;margin:0;padding:0}.comment{padding:16px 0;border-top:1px solid var(--line)}.comment-replies{margin:10px 0 0 22px;border-left:2px solid var(--line)}.comment-replies .comment{padding:10px 0 10px 16px;border-top:0}.comment-meta{display:flex;gap:12px;align-items:baseline;margin:0;font-size:13px}.comment-meta time{color:var(--muted);font-size:12px}.comment-body{margin:4px 0 6px;white-space:pre-wrap;overflow-wrap:anywhere;font-size:15px}.comment.is-deleted>.comment-body{color:var(--muted);font-size:13px}.comment-actions{display:flex;flex-wrap:wrap;gap:16px;font-size:13px}.account-stats h2{margin:6px 0 8px}.account-stats table{width:100%;border-collapse:collapse;font-size:14px;margin-top:10px}.account-stats td,.account-stats th{text-align:left;padding:7px 4px;border-bottom:1px solid var(--line)}.account-stats td:last-child,.account-stats th:last-child{text-align:right;white-space:nowrap;font-feature-settings:"tnum";font-variant-numeric:tabular-nums}.course-credit{border:1px solid var(--line);border-left:3px solid var(--accent);border-radius:4px;background:var(--panel);padding:18px 24px;font-size:14px;line-height:1.8;color:var(--muted)}.course-credit p{margin:0 0 6px}.course-credit p:last-child{margin-bottom:0}.course-credit b{color:var(--ink)}.course-credit a{margin:0 .15em}.nav-cta-wrap{position:relative;flex:none}.nav-cta{display:inline-block;padding:7px 16px;border:1px solid var(--ink);border-radius:4px;background:var(--ink);color:#fff;font-size:13px;font-weight:650;text-decoration:none;white-space:nowrap}.nav-cta:hover{background:#2d3136;border-color:#2d3136}.nav-inner{position:relative}@media(max-width:720px){.nav-cta-wrap{margin-left:auto}.nav-burger{margin-left:0}}.signin-guide{position:absolute;top:calc(100% + 14px);right:-6px;z-index:60;display:flex;align-items:flex-start;gap:4px;width:max-content;max-width:min(330px,calc(100vw - 24px));animation:guide-in .35s ease-out both}.signin-guide-bubble{position:relative;margin-top:34px;padding:12px 30px 12px 14px;border:1px solid var(--line-strong);border-radius:10px;background:var(--panel);box-shadow:0 6px 20px rgba(0,0,0,.08);font-size:13px;line-height:1.65;color:var(--muted)}.signin-guide-bubble p{margin:0;max-width:220px}.signin-guide-bubble b{display:block;color:var(--ink);font-size:14px;margin-bottom:2px}.signin-guide-bubble:after{content:"";position:absolute;right:-7px;top:18px;width:12px;height:12px;background:var(--panel);border-right:1px solid var(--line-strong);border-top:1px solid var(--line-strong);transform:rotate(45deg)}.signin-guide-close{position:absolute;top:4px;right:6px;border:0;background:none;color:var(--muted);font-size:17px;line-height:1;padding:4px;cursor:pointer}.signin-guide-close:hover{color:var(--ink)}.signin-guide-buddy{width:76px;height:86px;flex:none;animation:guide-bob 2.6s ease-in-out infinite}.signin-guide-buddy .body{fill:var(--accent)}.signin-guide-buddy .phones{fill:none;stroke:var(--ink);stroke-width:3;stroke-linecap:round}.signin-guide-buddy .cup{fill:var(--orange)}.signin-guide-buddy .eye{fill:#fff}.signin-guide-buddy .smile{fill:none;stroke:#fff;stroke-width:2;stroke-linecap:round}.signin-guide-buddy .arm,.signin-guide-buddy .leg{fill:none;stroke:var(--ink);stroke-width:3;stroke-linecap:round}.signin-guide-buddy .hand{fill:var(--ink);transform-origin:44px 34px}.signin-guide-buddy .arm:first-of-type,.signin-guide-buddy .hand{animation:guide-point 1.3s ease-in-out infinite;transform-origin:44px 34px}@keyframes guide-in{0%{opacity:0;transform:translateY(-6px)}to{opacity:1;transform:none}}@keyframes guide-bob{0%,to{transform:translateY(0)}50%{transform:translateY(-5px)}}@keyframes guide-point{0%,to{transform:rotate(0)}50%{transform:rotate(-10deg)}}@media(prefers-reduced-motion:reduce){.signin-guide,.signin-guide-buddy,.signin-guide-buddy .arm,.signin-guide-buddy .hand{animation:none}}@media print{.signin-guide{display:none}}@media(max-width:720px){.nav-cta-wrap{position:static}.signin-guide{right:54px;max-width:calc(100vw - 66px)}.signin-guide-bubble{min-width:0;flex:1 1}.signin-guide-bubble p{max-width:none}.signin-guide-buddy{width:64px;height:72px}}.nav-lang{display:flex;align-items:center;gap:2px;margin:0 12px 0 10px;padding:2px;border:1px solid var(--line);border-radius:999px;font-size:12px;flex:none}.nav-lang a{min-width:28px;padding:3px 8px;border-radius:999px;color:var(--muted);text-align:center;text-decoration:none;line-height:1.5}.nav-lang a:hover{color:var(--ink);background:var(--code-bg)}.nav-lang a[aria-current=true]{background:var(--ink);color:#fff;font-weight:650}@media(max-width:720px){.nav-lang{margin:0 8px 0 auto}.nav-lang+.nav-cta-wrap{margin-left:0}}.lang-note{margin:0;padding:12px 16px;border:1px solid color-mix(in srgb,var(--accent) 30%,var(--line));border-radius:4px;background:var(--accent-soft);color:var(--ink);font-size:14px;line-height:1.7}.legal-shell .lang-note{margin:0 0 20px}body:lang(ja),h1:lang(ja),h2:lang(ja),h3:lang(ja){font-family:Noto Sans JP,Hiragino Sans,Hiragino Kaku Gothic ProN,Yu Gothic UI,Yu Gothic,Meiryo,system-ui,sans-serif}body:lang(en),h1:lang(en),h2:lang(en),h3:lang(en){font-family:system-ui,-apple-system,Segoe UI,Roboto,Helvetica Neue,Arial,Noto Sans SC,sans-serif}body:lang(en) [lang=zh-CN],body:lang(ja) [lang=zh-CN]{font-family:Noto Sans SC,PingFang SC,Microsoft YaHei,system-ui,sans-serif}.course-detail .lang-note{margin-bottom:28px}.lesson-n{white-space:nowrap}@media(max-width:480px){.nav-brand-copy{display:none}.nav-lang{margin-right:6px}.nav-lang a{min-width:24px;padding:3px 6px}.nav-cta{padding:7px 12px}}body [lang=zh-CN] [lang=ja]{font-family:Noto Sans JP,Hiragino Sans,Hiragino Kaku Gothic ProN,Yu Gothic UI,Yu Gothic,Meiryo,system-ui,sans-serif}body [lang=zh-CN] [lang=en]{font-family:system-ui,-apple-system,Segoe UI,Roboto,Helvetica Neue,Arial,Noto Sans SC,sans-serif}