:root{color-scheme:light;--bg-canvas: #ffffff;--bg-surface: #fafafa;--bg-elevated: #f4f4f5;--bg-muted: #f4f4f5;--bg-hover: #f0f0f1;--bg-border: #d4d4d8;--bg-border-strong: #b4b4bb;--bg-text: #000000;--bg-text-secondary: #52525b;--bg-text-muted: #71717a;--bg-accent: #6366f1;--bg-accent-hover: #4f46e5;--bg-accent-soft: #eef0ff;--canvas: var(--bg-canvas, #ffffff);--surface: var(--bg-surface, #fafafa);--surface-elevated: var(--bg-elevated, #f4f4f5);--surface-soft: var(--bg-muted, #f4f4f5);--surface-blue: var(--bg-muted, #f4f4f5);--ink: var(--bg-text, #000000);--ink-soft: var(--bg-text-secondary, #52525b);--ink-muted: var(--bg-text-muted, #71717a);--line: var(--bg-border, #d4d4d8);--line-strong: var(--bg-border-strong, #b4b4bb);--brand: var(--bg-accent, #6366f1);--brand-deep: var(--bg-accent-hover, #4f46e5);--brand-soft: var(--bg-accent-soft, #eef0ff);--success: #1a7f37;--success-soft: #dafbe1;--gold: #9a6700;--gold-soft: #fff8c5;--shadow: 0 22px 60px rgb(0 0 0 / 8%);--shadow-soft: 0 10px 28px rgb(0 0 0 / 6%);--sans: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;--sans-cjk: "Noto Sans SC", "Source Han Sans SC", "Microsoft YaHei", "PingFang SC", var(--sans);--serif: "Iowan Old Style", "Palatino Linotype", "Book Antiqua", "Songti SC", "STSong", Georgia, serif;--type-hero: clamp(3.5rem, 4vw, 4rem);--type-section: clamp(2.75rem, 3.45vw, 3.25rem);--type-body: clamp(1rem, 1.1vw, 1.125rem);--type-ui: .8125rem;--type-meta: .6875rem;--ease-out: cubic-bezier(.22, 1, .36, 1)}:root[data-theme=dark]{color-scheme:dark;--bg-canvas: #0d1117;--bg-surface: #161b22;--bg-elevated: #21262d;--bg-muted: #1b2028;--bg-hover: #21262d;--bg-border: #30363d;--bg-border-strong: #4d5560;--bg-text: #e6edf3;--bg-text-secondary: #848d97;--bg-text-muted: #656d76;--bg-accent: #a99bf0;--bg-accent-hover: #c0b4f7;--bg-accent-soft: color-mix(in srgb, var(--bg-accent) 14%, var(--bg-surface));--canvas: var(--bg-canvas, #0d1117);--surface: var(--bg-surface, #161b22);--surface-elevated: var(--bg-elevated, #21262d);--surface-soft: var(--bg-muted, #1b2028);--surface-blue: var(--bg-hover, #21262d);--ink: var(--bg-text, #e6edf3);--ink-soft: var(--bg-text-secondary, #848d97);--ink-muted: var(--bg-text-muted, #656d76);--line: var(--bg-border, #30363d);--line-strong: var(--bg-border-strong, #4d5560);--brand: var(--bg-accent, #a99bf0);--brand-deep: var(--bg-accent, #a99bf0);--brand-soft: var(--bg-accent-soft, #23252e);--success: #3fb950;--success-soft: color-mix(in srgb, var(--success) 18%, var(--bg-surface));--gold: #d29922;--gold-soft: color-mix(in srgb, var(--gold) 18%, var(--bg-surface));--shadow: 0 22px 60px rgb(0 0 0 / 40%);--shadow-soft: 0 10px 28px rgb(0 0 0 / 30%)}*,*:before,*:after{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:92px}body{min-width:320px;margin:0;overflow-x:hidden;background:var(--canvas);color:var(--ink);font-family:var(--sans);font-size:16px;line-height:1.65;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased}body[data-locale=zh]{font-family:var(--sans-cjk);line-break:strict}.header-session-loading{width:84px;height:34px;border-radius:999px;background:linear-gradient(90deg,var(--surface-soft),var(--surface),var(--surface-soft));background-size:200% 100%;animation:session-loading 1.4s ease-in-out infinite}@keyframes session-loading{to{background-position:-200% 0}}img{display:block;max-width:100%}a{color:inherit;text-decoration:none}button,input{font:inherit}button,a{touch-action:manipulation;-webkit-tap-highlight-color:rgb(37 99 235 / 14%)}:focus-visible{outline:3px solid rgb(37 99 235 / 42%);outline-offset:4px}[hidden]{display:none!important}section[id]{scroll-margin-top:92px}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.skip-link{position:fixed;z-index:100;top:12px;left:12px;padding:10px 14px;border-radius:10px;background:var(--surface);box-shadow:var(--shadow-soft);transform:translateY(-180%);transition:transform .16s ease}.skip-link:focus-visible{transform:translateY(0)}.section-shell{width:min(1240px,calc(100% - 64px));margin-inline:auto}.section-block{padding-block:clamp(68px,7.5vw,108px)}.eyebrow{margin:0 0 17px;color:var(--brand);font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:.69rem;font-weight:800;letter-spacing:.15em;text-transform:uppercase}h1,h2,h3,h4,p{margin-top:0}h1,h2,h3{text-wrap:balance}.site-header{position:sticky;z-index:50;top:0;display:grid;grid-template-columns:auto 1fr auto;align-items:center;width:min(1240px,calc(100% - 64px));min-height:82px;margin-inline:auto;border-bottom:1px solid rgb(220 227 239 / 78%);background:#f6f7fbe5;-webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);transition:min-height .16s ease,box-shadow .16s ease}.site-header.is-scrolled{min-height:66px;box-shadow:0 8px 26px #1f314f0d}.brand{display:inline-flex;align-items:center;min-width:0;gap:10px;font-size:1.35rem;font-weight:790;letter-spacing:-.035em;white-space:nowrap}.brand img{border-radius:10px}.brand-cn{color:var(--ink-soft);font-size:.7rem;font-weight:700;letter-spacing:.08em}.desktop-nav{display:flex;justify-content:center;gap:clamp(18px,2.6vw,34px);min-width:0;color:var(--ink-soft);font-size:.83rem;font-weight:650}.desktop-nav a,.language-link,.account-link,.text-link,.site-footer nav a{text-underline-offset:5px}.desktop-nav a:hover,.language-link:hover,.account-link:hover,.text-link:hover,.site-footer nav a:hover{color:var(--brand-deep);text-decoration:underline}.header-actions,.hero-actions,.desktop-power-actions,.preview-meta,.preview-brand,.preview-video-topline,.preview-playbar,.sample-note-heading,.footer-inner,.artifact-facts,.workflow-demo{min-width:0}.header-actions{display:flex;align-items:center;gap:13px}.language-link{color:var(--ink-soft);font-size:.8rem;font-weight:760}.account-link{color:var(--ink-soft);font-size:.8rem;font-weight:760;white-space:nowrap}.button{display:inline-flex;min-height:46px;align-items:center;justify-content:center;padding:11px 20px;border:1px solid transparent;border-radius:9px;font-size:.88rem;font-weight:600;line-height:1.2;transition:background-color .18s var(--ease-out),border-color .18s var(--ease-out),box-shadow .18s var(--ease-out),color .18s var(--ease-out),transform .18s var(--ease-out)}.button:active,.account-tabs button:active,.account-text-button:active,.account-text-action:active,.journey-motion-toggle:active,.demo-motion-toggle:active{transform:scale(.985)}a.button:hover{box-shadow:var(--shadow-soft);transform:translateY(-1px)}button.button:disabled{cursor:not-allowed;opacity:.55}.button-primary{background:var(--control-accent);color:#fff}.button-primary:hover:not(:disabled){background:color-mix(in srgb,var(--control-accent) 86%,#000)}.button-secondary{border-color:var(--line-strong);background:var(--surface);color:var(--ink)}.button-secondary:hover:not(:disabled){border-color:var(--brand);color:var(--brand-deep)}.button-small{min-height:40px;padding:8px 15px;border-radius:999px;font-size:.78rem}.menu-button{display:none;width:44px;height:44px;border:1px solid var(--line-strong);border-radius:11px;background:var(--surface)}.theme-toggle{display:inline-grid;width:44px;height:44px;flex:none;place-items:center;padding:0;border:1px solid var(--line-strong);border-radius:12px;background:var(--surface);color:var(--ink);cursor:pointer;transition:border-color .16s ease,color .16s ease,background-color .16s ease,transform .16s ease}.theme-toggle:hover{border-color:var(--brand);color:var(--brand-deep);transform:translateY(-1px)}.theme-icon{font-size:1.1rem;line-height:1}.theme-icon-sun{display:none}:root[data-theme=dark] .theme-icon-moon{display:none}:root[data-theme=dark] .theme-icon-sun{display:block}.menu-button span[aria-hidden=true]{display:block;width:18px;height:1.5px;margin:5px auto;border-radius:2px;background:var(--ink)}.mobile-menu{position:absolute;top:calc(100% + 8px);right:0;left:0;padding:10px;border:1px solid var(--line);border-radius:16px;background:var(--surface);box-shadow:var(--shadow)}.mobile-menu a{display:block;padding:13px 14px;border-radius:10px;color:var(--ink-soft)}.mobile-menu a:hover{background:var(--surface-soft);color:var(--ink)}.mobile-menu .mobile-account-cta{display:inline-flex;width:100%;margin:4px 0;color:#fff}.hero{display:grid;grid-template-columns:minmax(0,1.28fr) minmax(340px,.62fr);gap:clamp(42px,6vw,96px);align-items:center;padding-top:clamp(70px,7vw,108px);padding-bottom:clamp(74px,8vw,120px)}.hero-copy{max-width:none}.hero h1{max-width:790px;margin-bottom:24px;font-family:var(--sans);font-size:var(--type-hero);font-weight:780;letter-spacing:-.043em;line-height:1.13}body[data-locale=zh] .hero h1{font-family:var(--sans-cjk);font-weight:650;letter-spacing:-.018em;line-height:1.2}body[data-locale=zh] .section-heading h2,body[data-locale=zh] .desktop-power-card h2,body[data-locale=zh] .account-intro h1,body[data-locale=zh] .account-panel-heading h2,body[data-locale=zh] .account-verification h2{font-family:var(--sans-cjk);font-weight:650;letter-spacing:-.018em;line-height:1.24}.account-page[data-session-state=loading] .account-shell{visibility:hidden}.account-desktop-checking{display:none;align-items:flex-start;flex-direction:column;gap:12px;min-height:270px;justify-content:center;padding:25px}.account-desktop-checking h2,.account-desktop-checking p{margin:0}.account-desktop-checking>p:last-child{color:var(--muted);max-width:44ch}.hero h1 span{color:var(--brand-deep)}.mobile-title-break{display:none}.hero-lede{max-width:760px;margin-bottom:30px;color:var(--ink-soft);font-size:var(--type-body)}.hero-entry{max-width:none;padding:10px;border:1px solid var(--line-strong);border-radius:23px;background:color-mix(in srgb,var(--surface) 94%,var(--brand) 6%);box-shadow:var(--shadow-soft)}.web-entry-form{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:10px}.web-entry-field{display:flex;min-width:0;min-height:62px;align-items:center;gap:13px;padding:0 17px;border:1px solid transparent;border-radius:15px;background:var(--surface-soft);transition:border-color .18s ease,box-shadow .18s ease}.web-entry-field:focus-within{border-color:var(--brand);box-shadow:0 0 0 3px color-mix(in srgb,var(--brand) 14%,transparent)}.web-entry-field>span{flex:none;color:var(--ink);font-size:.8rem;font-weight:800}.web-entry-field input{width:100%;min-width:0;border:0;background:transparent;color:var(--ink);font:inherit;font-size:.94rem}.web-entry-field input::placeholder{color:#8994a7;opacity:1}.web-entry-field input:focus-visible{outline:2px solid var(--brand);outline-offset:3px}.web-entry-submit{min-height:62px;padding-inline:25px;white-space:nowrap;will-change:transform}.web-entry-form[data-previewing=true] .web-entry-field{opacity:.78}.web-entry-note{display:flex;flex-wrap:wrap;gap:7px;margin:11px 7px 1px;color:var(--ink-muted);font-size:var(--type-ui)}.web-entry-status{min-height:1.35em;margin:7px 3px 0;color:var(--ink-muted);font-size:.76rem}.web-entry-status[data-state=error]{color:#b42318;font-weight:650}.web-entry-note span{color:var(--brand-deep);font-weight:800}.hero-actions{display:flex;flex-wrap:wrap;align-items:center;gap:20px;margin:20px 0 21px}.text-link{color:var(--brand-deep);font-size:.88rem;font-weight:750}.hero-trust{max-width:520px;margin:0;color:var(--ink-muted);font-size:var(--type-ui)}.hero-journey{width:min(100%,414px);justify-self:end}.hero-journey-card{padding:22px;border:1px solid var(--line-strong);border-radius:24px;background:color-mix(in srgb,var(--surface) 88%,var(--brand) 12%);box-shadow:var(--shadow)}.journey-topline{display:flex;align-items:center;justify-content:space-between;gap:10px;padding-bottom:15px;border-bottom:1px solid var(--line);color:var(--ink-muted);font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:.72rem;font-weight:800;letter-spacing:.1em}.journey-topline>span:first-child{color:var(--brand)}.journey-state{display:inline-flex;align-items:center;gap:6px;letter-spacing:0}.journey-state i{width:6px;height:6px;border-radius:50%;background:var(--success);animation:journey-pulse 2.4s ease-in-out infinite;transform-origin:center;will-change:transform}.journey-motion-toggle{flex:0 0 auto;border:0;padding:0;background:transparent;color:var(--ink-muted);cursor:pointer;font:inherit;font-size:var(--type-meta);font-weight:800;letter-spacing:.06em;text-decoration:underline;text-underline-offset:3px}.journey-motion-toggle:hover{color:var(--brand-deep)}.journey-steps{display:grid;gap:0;margin:15px 0;padding:0;list-style:none}.journey-steps li{position:relative;display:grid;grid-template-columns:30px minmax(0,1fr);gap:12px;padding:13px 0;border-bottom:1px solid var(--line);opacity:.68;transition:opacity .18s var(--ease-out)}.journey-steps li:last-child{border-bottom:0}.journey-steps li:not(:last-child):after{position:absolute;z-index:1;bottom:-13px;left:8px;color:var(--line-strong);content:"↓";font-size:.76rem;line-height:1}.journey-steps b{display:grid;width:27px;height:27px;place-items:center;border:1px solid var(--line-strong);border-radius:8px;color:var(--ink-muted);font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:var(--type-meta)}.journey-steps li.is-current b{border-color:var(--brand);background:var(--brand);color:#fff}.journey-steps li.is-current{margin-inline:-8px;padding-inline:8px;border-radius:10px;background:color-mix(in srgb,var(--brand) 8%,transparent);opacity:1}.journey-steps li.is-current:after{color:var(--brand)}.journey-steps li>div,.journey-result{display:grid;gap:3px}.journey-steps span,.journey-result>span{color:var(--ink-muted);font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:.72rem;font-weight:760;letter-spacing:.08em;text-transform:uppercase}.journey-steps strong{color:var(--ink);font-size:.9rem;font-weight:720;letter-spacing:-.012em;line-height:1.35}.journey-steps li.is-current strong{color:var(--brand-deep);font-weight:800}.journey-result{padding:15px;border:1px solid var(--line-strong);border-radius:14px;background:color-mix(in srgb,var(--surface-soft) 86%,var(--brand) 14%)}.journey-result>span{color:var(--brand-deep)}.journey-result strong{color:var(--ink);font-size:.86rem;font-weight:780;line-height:1.45}.hero-journey>p{margin:12px 6px 0;color:var(--ink-muted);font-size:.72rem}@keyframes journey-pulse{0%,to{opacity:.72;transform:scale(1)}50%{opacity:1;transform:scale(1.34)}}.result-preview{padding-block:clamp(72px,9vw,130px);border-block:1px solid #dce5f2;background:#edf2fa}.result-preview .section-heading{max-width:770px}.result-capabilities{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));max-width:1120px;gap:0;margin:-4px auto 28px;padding:0;border-block:1px solid var(--line-strong);list-style:none}.result-capabilities li{display:grid;min-width:0;padding:16px 18px;grid-template-columns:28px minmax(0,1fr);gap:10px;color:var(--ink-soft);font-size:var(--type-ui)}.result-capabilities li+li{border-left:1px solid var(--line-strong)}.result-capabilities b{color:var(--brand);font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:var(--type-meta);letter-spacing:.08em}.result-capabilities span,.result-capabilities strong{display:block}.result-capabilities strong{margin-bottom:2px;color:var(--ink);font-size:.86rem}.result-preview-frame{max-width:1120px;margin:0 auto}.demo-fallback{margin:0;padding:28px;border:1px solid var(--line);border-radius:22px;background:var(--surface);color:var(--ink-soft)}.web-result-preview{--play-progress: .08;--preview-surface: #fff;--preview-surface-raised: #fbfcff;--preview-video-surface: #eaf0fb;--preview-card-surface: #f8faff;--preview-text: #15233b;--preview-text-soft: #53627a;--preview-text-muted: #6f7c92;--preview-border: #d7e1ef;--preview-skeleton: #e7edf6;overflow:hidden;border:1px solid var(--preview-border);border-radius:26px;background:var(--preview-surface);color:var(--preview-text);box-shadow:var(--shadow)}.web-result-preview[data-demo-stage=processing]{--play-progress: .32}.web-result-preview[data-demo-stage=notes]{--play-progress: .55}.web-result-preview[data-demo-stage=visual]{--play-progress: .73}.web-result-preview[data-demo-stage=ready]{--play-progress: .94}.preview-topbar{display:grid;grid-template-columns:1fr auto auto;align-items:center;gap:14px;min-height:54px;padding:10px 14px 10px 16px;border-bottom:1px solid var(--preview-border);background:var(--preview-surface-raised)}.preview-brand{display:inline-flex;align-items:center;gap:8px;font-size:.79rem;font-weight:790}.preview-brand-mark{display:inline-grid;width:23px;height:23px;place-items:center;border-radius:7px;background:var(--brand);color:#fff;font-size:.7rem;font-weight:850}.preview-meta{display:inline-flex;align-items:center;gap:7px;min-width:0;color:var(--ink-muted);font-size:.75rem;font-weight:680;white-space:nowrap}.preview-presence{width:5px;height:5px;border-radius:50%;background:var(--success)}.demo-motion-toggle{min-height:30px;padding:5px 9px;border:1px solid var(--preview-border);border-radius:8px;background:var(--preview-surface);color:var(--preview-text-soft);cursor:pointer;font-size:.72rem;font-weight:720;transition:border-color .16s ease,color .16s ease,background-color .16s ease}.demo-motion-toggle:hover{border-color:var(--brand);color:var(--brand-deep)}.preview-surface{display:grid;grid-template-columns:minmax(230px,.8fr) minmax(340px,1.2fr);min-height:442px}.preview-video-pane{position:relative;display:flex;min-width:0;flex-direction:column;justify-content:space-between;padding:20px;overflow:hidden;background:var(--preview-video-surface)}.preview-video-topline,.preview-playbar{display:flex;align-items:center;justify-content:space-between;gap:12px;color:var(--preview-text-muted);font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:.72rem;font-weight:720;letter-spacing:.08em}.preview-video-topline span:first-child{color:var(--brand-deep)}.pc-build-art{position:relative;min-height:190px;margin:24px 0 20px;border:1px solid #cbd8ed;border-radius:16px;background:#dce7f7}.scratch-lesson-art{position:relative;min-height:190px;margin:24px 0 20px;overflow:hidden;border:1px solid #cbd8ed;border-radius:16px;background:#dce7f7}.scratch-stage,.scratch-block,.scratch-key-stage,.scratch-key-block{position:absolute;display:block}.scratch-stage{top:26px;bottom:26px;left:27px;width:39%;overflow:hidden;border:1px solid #aebfd7;border-radius:11px;background:#fbfcff}.scratch-stage:before{position:absolute;top:0;right:0;left:0;height:23px;content:"";border-bottom:1px solid #d7e1ef;background:#eef4ff}.scratch-stage b{position:absolute;top:54%;left:50%;color:var(--brand);font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:.67rem;letter-spacing:.08em;transform:translate(-50%,-50%)}.scratch-flag{position:absolute;z-index:1;top:8px;left:11px;width:8px;height:8px;border-radius:50%;background:var(--success)}.scratch-block{right:24px;left:calc(39% + 47px);min-height:29px;padding:8px 10px;border-radius:8px 8px 12px;color:#fff;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:.57rem;font-weight:760;letter-spacing:.02em}.scratch-block-event{top:31px;background:#d18a2f}.scratch-block-say{top:72px;background:#7766b7}.scratch-block-loop{top:113px;background:#d46c5d}.build-corner,.build-board,.build-cpu,.build-memory,.build-gpu,.build-ssd{position:absolute;display:block;border-radius:6px}.build-corner{width:33px;height:33px;border:2px solid #b3c5df}.build-corner-one{top:12px;left:12px;border-right:0;border-bottom:0}.build-corner-two{right:12px;bottom:12px;border-top:0;border-left:0}.build-board{top:35px;right:37px;bottom:31px;left:37px;border:6px solid 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var(--preview-border);border-radius:16px;background:var(--preview-card-surface)}.preview-video-copy span{color:var(--gold);font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:var(--type-meta);font-weight:800;letter-spacing:.12em}.preview-video-copy strong{overflow-wrap:anywhere;color:var(--preview-text);font-size:clamp(1rem,1.7vw,1.38rem);letter-spacing:-.035em;line-height:1.22}.preview-video-copy small{color:var(--preview-text-soft);font-size:.72rem}.preview-playbar{color:#6f7c92}.preview-play-dot{width:8px;height:8px;border-radius:50%;background:var(--brand)}.preview-play-track{position:relative;height:3px;flex:1;overflow:hidden;border-radius:999px;background:#bdcbe0}.preview-play-track i{display:block;width:100%;height:100%;border-radius:inherit;background:var(--brand);transform:scaleX(var(--play-progress));transform-origin:left center;transition:transform .64s ease}.preview-note-pane{display:grid;min-width:0;grid-template-rows:auto 1fr 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