#hu-landing{--hu-bg:light-dark(#fff,#111820);--hu-ink:light-dark(#15232f,#eef3fa);--hu-muted:light-dark(#667481,#a4b2c0);--hu-soft:light-dark(#f3f6f9,#1b2632);--hu-line:light-dark(#dde5ec,#334354);--hu-blue:light-dark(#3469ba,#91baff);--hu-blue-soft:light-dark(#eaf1fc,#213a5b);--hu-paper:light-dark(#fff,#202e3a);--hu-shadow:light-dark(#29466515,#00000040);background:var(--hu-bg);color:var(--hu-ink);font:15px/1.7 'Segoe UI','Microsoft YaHei',sans-serif;border-radius:12px;overflow:clip;isolation:isolate}
#hu-landing *{box-sizing:border-box}#hu-landing h1,#hu-landing h2,#hu-landing h3,#hu-landing p{margin:0}#hu-landing button,#hu-landing a{font:inherit;color:inherit}#hu-landing button{cursor:default}#hu-landing a{text-decoration:none}#hu-landing button:focus-visible,#hu-landing a:focus-visible,#hu-landing summary:focus-visible{outline:3px solid var(--hu-blue);outline-offset:4px}#hu-landing .hu-wrap{width:88%;max-width:1120px;margin:auto}#hu-landing .hu-nav{display:flex;align-items:center;justify-content:space-between;gap:20px;min-height:86px;border-bottom:1px solid var(--hu-line)}#hu-landing .hu-brand{display:flex;align-items:center;gap:10px;font-size:22px;font-weight:650;letter-spacing:-1px}#hu-landing .hu-mark{display:grid;place-items:center;width:31px;height:31px;background:var(--hu-ink);color:var(--hu-bg);border-radius:9px}#hu-landing .hu-links{display:flex;align-items:center;gap:28px;font-size:13px}#hu-landing .hu-links a:hover{color:var(--hu-blue)}#hu-landing .hu-nav-cta{padding:8px 14px;border:1px solid var(--hu-line);border-radius:7px}#hu-landing .hu-hero{padding:68px 0 40px}#hu-landing .hu-eyebrow{display:flex;gap:9px;align-items:center;font-size:11px;font-weight:600;letter-spacing:2px;color:var(--hu-blue);text-transform:uppercase;margin-bottom:22px}#hu-landing .hu-eyebrow:before{content:'';width:22px;height:1px;background:currentColor}#hu-landing .hu-hero-top{display:grid;grid-template-columns:1.15fr 1fr;gap:35px;align-items:end}#hu-landing h1{font-size:clamp(36px,5.4vw,66px);line-height:1.2;letter-spacing:-2.5px;font-weight:600}#hu-landing h1 span{color:var(--hu-blue)}#hu-landing .hu-intro{color:var(--hu-muted);max-width:390px;font-size:16px;line-height:1.9;padding-bottom:3px}#hu-landing .hu-actions{display:flex;align-items:center;gap:23px;margin-top:26px;flex-wrap:wrap}#hu-landing .hu-primary{display:inline-flex;gap:10px;align-items:center;justify-content:center;border:0;background:var(--hu-ink);color:var(--hu-bg);border-radius:8px;min-height:46px;padding:10px 20px;font-size:14px;font-weight:500}#hu-landing .hu-secondary{display:inline-flex;align-items:center;gap:7px;font-size:14px}#hu-landing .hu-note{font-size:12px;color:var(--hu-muted);margin-top:15px}#hu-landing .hu-scene{margin-top:44px;padding:34px 40px 24px;border-radius:20px;background:var(--hu-soft);position:relative;min-height:440px}#hu-landing .hu-scene-top{display:flex;justify-content:space-between;gap:10px;margin-bottom:20px;color:var(--hu-muted);font-size:11px;letter-spacing:1.5px}#hu-landing .hu-monitor{width:78%;border:7px solid light-dark(#283441,#0c1219);border-bottom-width:12px;border-radius:13px;background:var(--hu-paper);box-shadow:0 20px 35px var(--hu-shadow)}#hu-landing .hu-window-head{display:flex;justify-content:space-between;align-items:center;padding:10px 15px;border-bottom:1px solid var(--hu-line);font-size:11px;color:var(--hu-muted);gap:10px}#hu-landing .hu-window-body{display:grid;grid-template-columns:37px 1fr;min-height:228px}#hu-landing .hu-tool-rail{display:flex;flex-direction:column;justify-content:center;align-items:center;gap:15px;background:var(--hu-soft);border-right:1px solid var(--hu-line);color:var(--hu-muted)}#hu-landing .hu-tool-rail svg{width:16px;height:16px;stroke-width:1.7}#hu-landing .hu-tool-selected{color:var(--hu-blue);background:var(--hu-blue-soft);padding:5px;border-radius:5px;display:flex}#hu-landing .hu-exercise{padding:25px 27px 20px}#hu-landing .hu-exercise small{font-size:10px;letter-spacing:1px;color:var(--hu-muted)}#hu-landing .hu-exercise h3{font-size:15px;font-weight:500;margin:5px 0 16px}#hu-landing .hu-problem{font:14px/1.8 Georgia,'Microsoft YaHei',serif}#hu-landing .hu-handwriting{font:italic 22px/1.7 'Segoe Print','KaiTi',cursive;color:var(--hu-blue);margin-top:16px;transform:rotate(-2deg);display:inline-block;border-bottom:1px solid var(--hu-blue)}#hu-landing .hu-monitor-foot{width:78%;height:42px;display:flex;justify-content:center}#hu-landing .hu-monitor-foot:before{content:'';display:block;width:24%;height:30px;background:light-dark(#b7c4d1,#3b4d5f);clip-path:polygon(30% 0,70% 0,76% 82%,100% 86%,100% 100%,0 100%,0 86%,24% 82%)}#hu-landing .hu-tablet{position:absolute;right:28px;bottom:46px;width:39%;padding:7px;border-radius:15px;background:light-dark(#344352,#0c1219);box-shadow:0 18px 28px var(--hu-shadow);transform:rotate(-5deg)}#hu-landing .hu-tablet-screen{background:var(--hu-paper);border-radius:8px;min-height:165px;padding:15px 20px}#hu-landing .hu-tablet-screen small{font-size:10px;color:var(--hu-muted)}#hu-landing .hu-tablet-screen .hu-handwriting{font-size:20px}#hu-landing .hu-stylus{position:absolute;right:-7px;top:15px;width:6px;height:130px;border-radius:4px;background:light-dark(#fafcff,#c9d3df);box-shadow:1px 2px 5px #0003;transform:rotate(7deg)}#hu-landing .hu-scene-caption{display:flex;gap:9px;align-items:center;margin-top:8px;font-size:12px;color:var(--hu-muted)}#hu-landing .hu-benefits{display:flex;gap:25px;justify-content:center;flex-wrap:wrap;padding:24px 0 12px;font-size:12px;color:var(--hu-muted)}#hu-landing .hu-benefits span{display:flex;gap:7px;align-items:center}#hu-landing .hu-section{padding:70px 0;border-top:1px solid var(--hu-line)}#hu-landing .hu-section-header{display:flex;align-items:end;justify-content:space-between;gap:36px;margin-bottom:32px}#hu-landing .hu-overline{font-size:11px;color:var(--hu-blue);letter-spacing:1.5px;margin-bottom:12px}#hu-landing h2{font-size:32px;line-height:1.4;font-weight:550;letter-spacing:-1px}#hu-landing .hu-section-header p{max-width:280px;color:var(--hu-muted);font-size:14px}#hu-landing .hu-workflow{display:grid;grid-template-columns:1fr 1.22fr;gap:44px;align-items:stretch}#hu-landing .hu-steps{display:flex;flex-direction:column;gap:2px}#hu-landing .hu-step{display:grid;grid-template-columns:28px 1fr;gap:14px;text-align:left;padding:19px 16px;border:0;border-left:2px solid transparent;border-radius:0 8px 8px 0;background:transparent;color:var(--hu-muted)}#hu-landing .hu-step[aria-pressed=true]{border-left-color:var(--hu-blue);background:var(--hu-soft);color:var(--hu-ink)}#hu-landing .hu-step-num{font-size:12px;letter-spacing:1px;padding-top:3px;color:var(--hu-blue)}#hu-landing .hu-step strong{font-size:17px;font-weight:500;display:block;margin-bottom:5px}#hu-landing .hu-step p{font-size:13px;color:var(--hu-muted);line-height:1.8}#hu-landing .hu-work-preview{background:var(--hu-soft);border-radius:16px;padding:27px;display:flex;flex-direction:column;justify-content:center;min-width:0}#hu-landing .hu-mini-top{display:flex;align-items:center;gap:9px;color:var(--hu-muted);font-size:12px;margin-bottom:18px}#hu-landing .hu-mini-paper{padding:25px;background:var(--hu-paper);border:1px solid var(--hu-line);box-shadow:0 6px 20px var(--hu-shadow);border-radius:8px;min-height:195px}#hu-landing .hu-mini-paper h3{font-size:16px;font-weight:500;margin-bottom:16px}#hu-landing .hu-mini-paper p{font-size:13px;color:var(--hu-muted)}#hu-landing .hu-mini-bottom{display:flex;align-items:center;gap:7px;border-top:1px solid var(--hu-line);padding-top:15px;margin-top:20px;color:var(--hu-blue);font-size:12px}#hu-landing .hu-feature-grid{display:grid;grid-template-columns:1.2fr 1fr;gap:18px}#hu-landing .hu-feature{background:var(--hu-soft);padding:32px;border-radius:16px;display:flex;flex-direction:column;gap:16px}#hu-landing .hu-feature h3{font-size:23px;font-weight:500;line-height:1.4}#hu-landing .hu-feature p{font-size:14px;color:var(--hu-muted);line-height:1.9}#hu-landing .hu-feature-icon{color:var(--hu-blue);margin-bottom:4px}#hu-landing .hu-ink-sample{margin-top:10px;padding:20px 22px;background:var(--hu-paper);border:1px solid var(--hu-line);border-radius:9px;display:flex;align-items:center;justify-content:space-between;gap:15px}#hu-landing .hu-ink-sample em{font:italic 44px/1 Georgia,serif;color:var(--hu-blue)}#hu-landing .hu-ink-sample span{font-size:12px;color:var(--hu-muted)}#hu-landing .hu-local-detail{display:flex;gap:10px;align-items:center;border-top:1px solid var(--hu-line);padding-top:18px;margin-top:auto;font-size:12px;color:var(--hu-muted)}#hu-landing .hu-bottom{display:grid;grid-template-columns:.85fr 1.15fr;gap:60px}#hu-landing .hu-bottom p{color:var(--hu-muted);font-size:14px;margin-top:17px}#hu-landing details{border-bottom:1px solid var(--hu-line);padding:0 0 19px;margin-bottom:19px}#hu-landing summary{font-size:14px;font-weight:500;cursor:default}#hu-landing details p{font-size:13px;line-height:1.9;margin-top:12px}#hu-landing .hu-final{padding:45px 40px;background:var(--hu-blue-soft);border-radius:16px;display:flex;align-items:center;justify-content:space-between;gap:25px;margin-bottom:48px}#hu-landing .hu-final h2{font-size:27px}#hu-landing .hu-final p{font-size:13px;color:var(--hu-muted);margin-top:8px}#hu-landing .hu-footer{border-top:1px solid var(--hu-line);display:flex;justify-content:space-between;gap:20px;padding:25px 0;color:var(--hu-muted);font-size:12px}#hu-landing [hidden]{display:none!important}#hu-landing .hu-demo-label{font-size:11px;color:var(--hu-muted);margin-top:14px}#hu-landing .hu-inline-formula{font:italic 23px/1.8 Georgia,serif;color:var(--hu-blue);padding:10px 0}#hu-landing .hu-detail-line{height:1px;background:var(--hu-line);margin:13px 0}#hu-landing .hu-grading{font-size:13px;padding:12px;background:var(--hu-blue-soft);border-radius:6px;color:var(--hu-blue);margin-top:14px}
@media(max-width:680px){#hu-landing .hu-wrap{width:88%}#hu-landing .hu-links{gap:12px}#hu-landing .hu-links .hu-extra{display:none}#hu-landing .hu-nav{min-height:70px}#hu-landing .hu-hero{padding-top:40px}#hu-landing .hu-hero-top,#hu-landing .hu-workflow,#hu-landing .hu-feature-grid,#hu-landing .hu-bottom{grid-template-columns:1fr;gap:25px}#hu-landing h1{font-size:44px}#hu-landing .hu-intro{font-size:15px}#hu-landing .hu-scene{padding:22px 14px;min-height:430px}#hu-landing .hu-monitor{width:100%;border-width:5px}#hu-landing .hu-monitor-foot{width:100%}#hu-landing .hu-tablet{width:62%;right:18px;bottom:44px}#hu-landing .hu-tablet-screen{min-height:120px;padding:10px 14px}#hu-landing .hu-tablet-screen .hu-handwriting{font-size:17px}#hu-landing .hu-scene-caption{margin-top:76px}#hu-landing .hu-exercise{padding:18px 15px}#hu-landing .hu-section{padding:45px 0}#hu-landing .hu-section-header{display:block}#hu-landing .hu-section-header p{margin-top:15px;max-width:none}#hu-landing h2{font-size:27px}#hu-landing .hu-feature{padding:25px}#hu-landing .hu-final{display:block;padding:28px}#hu-landing .hu-final .hu-primary{margin-top:22px}#hu-landing .hu-footer{flex-wrap:wrap}#hu-landing .hu-benefits{gap:12px;font-size:11px}#hu-landing .hu-window-head{font-size:10px;padding:9px}#hu-landing .hu-window-head span:last-child{display:none}}
@media(prefers-reduced-motion:no-preference){#hu-landing .hu-step{transition:background .18s,border-color .18s}}

:root { color-scheme: light; }
* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 28px; }
body { margin: 0; background: #fff; }
#hu-landing { border-radius: 0; }
#hu-landing section { scroll-margin-top: 28px; }
#hu-landing button, #hu-landing summary, #hu-landing .cursor-interaction { cursor: pointer; }
#hu-landing svg { width: 18px; height: 18px; flex-shrink: 0; vertical-align: middle; }
#hu-landing .hu-tablet { transform: none; }
#hu-landing .hu-tablet-screen small { display: block; }
#hu-landing .hu-scene { padding-bottom: 30px; }
#hu-landing .hu-scene-caption { padding-top: 18px; }
#hu-landing .ink-surface { position: relative; margin-top: 12px; background: repeating-linear-gradient(transparent,transparent 30px,#e5ecf5 31px,transparent 32px); }
#hu-landing canvas[data-ink] { display: block; width: 100%; aspect-ratio: 3 / 1; touch-action: none; cursor: crosshair; }
#hu-landing .ink-placeholder { position: absolute; inset: 0; display: grid; place-items: center; pointer-events: none; color: #758599; font-size: 12px; }
#hu-landing .hu-tool-rail button { display: flex; justify-content: center; align-items: center; padding: 5px; width: 29px; height: 32px; border: 0; background: transparent; color: #747e8c; border-radius: 5px; }
#hu-landing .hu-tool-rail button[aria-pressed=true] { background: #e9effb; color: #3469ba; }
#hu-landing .demo-controls { display: flex; flex-wrap: wrap; align-items: center; gap: 14px; padding: 18px 0 8px; }
#hu-landing .demo-controls button, #hu-landing .demo-button { min-height: 40px; padding: 8px 12px; display: inline-flex; align-items: center; justify-content: center; gap: 7px; border: 1px solid var(--hu-line); border-radius: 7px; background: var(--hu-bg); color: var(--hu-ink); font-size: 12px; }
#hu-landing button:disabled { opacity: .4; cursor: default; }
#hu-landing .demo-colors { display: flex; gap: 4px; }
#hu-landing .demo-colors button { width: 40px; padding: 0; }
#hu-landing .demo-colors button[aria-pressed=true] { background: var(--hu-blue-soft); border-color: var(--hu-blue); }
#hu-landing .demo-colors button[aria-pressed=true] span::after { content: '✓'; color: #fff; font-size: 12px; }
#hu-landing .demo-colors span { display: grid; place-items: center; width: 20px; height: 20px; background: var(--ink); border-radius: 50%; }
#hu-landing .demo-width { display: flex; align-items: center; gap: 7px; font-size: 12px; }
#hu-landing .demo-width input { width: 84px; accent-color: #3469ba; min-height: 40px; }
#hu-landing .demo-width output { width: 24px; font-variant-numeric: tabular-nums; }
#hu-landing #demo-status { font-size: 12px; color: var(--hu-muted); min-height: 24px; }
#hu-landing .demo-upload { margin-top: 20px; padding-top: 18px; border-top: 1px solid var(--hu-line); }
#hu-landing .demo-upload label { display: block; font-size: 13px; margin-bottom: 8px; }
#hu-landing .demo-upload input { width: 100%; font: inherit; font-size: 12px; }
#hu-landing .demo-upload input::file-selector-button { padding: 9px 12px; background: var(--hu-bg); border: 1px solid var(--hu-line); border-radius: 7px; color: var(--hu-ink); cursor: pointer; margin-right: 8px; }
#hu-landing #demo-photo-preview { width: 100%; max-height: 260px; object-fit: contain; margin-top: 15px; background: #fff; }
#hu-landing #demo-photo-status { overflow-wrap: anywhere; font-size: 12px; color: var(--hu-muted); margin: 8px 0; }
#hu-landing .demo-reserved-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 16px; }
#hu-landing .demo-reserved { margin: 0; }
#hu-landing .demo-reserved-space { min-height: 125px; border: 1px dashed var(--hu-line); background: var(--hu-soft); border-radius: 12px; }
#hu-landing .demo-reserved figcaption { display: flex; flex-wrap: wrap; gap: 10px; justify-content: space-between; margin-top: 12px; font-size: 13px; }
#hu-landing .demo-reserved figcaption span { color: var(--hu-muted); font-size: 12px; }
@media(max-width:680px) {
  #hu-landing .hu-scene { min-height: 430px; }
  #hu-landing .hu-monitor { margin-bottom: 95px; }
  #hu-landing .hu-monitor-foot { display: none; }
  #hu-landing .hu-tablet { bottom: 70px; }
  #hu-landing .hu-scene-caption { margin-top: 0; }
  #hu-landing .demo-reserved-grid { grid-template-columns: 1fr; }
  #hu-landing .demo-reserved-space { min-height: 95px; }
  #hu-landing .demo-controls { gap: 9px; }
}
@media(prefers-reduced-motion:reduce) { html { scroll-behavior: auto; } }
#hu-landing .hu-brand .hu-mark{width:44px;height:44px;background:transparent;border-radius:0}
#hu-landing .hu-mark img{display:block;width:44px;height:44px;object-fit:contain}
#hu-landing .hu-footer a{color:inherit}
#hu-landing .hu-footer a:hover{color:var(--hu-blue)}
#hu-landing .hu-privacy{width:min(720px,88%);margin:48px auto 80px}
#hu-landing .hu-privacy h1{font-size:32px;line-height:1.3;font-weight:550;letter-spacing:-1px}
#hu-landing .hu-privacy h2{font-size:18px;line-height:1.5;font-weight:550;letter-spacing:0;margin-top:1.7em}
#hu-landing .hu-privacy p,#hu-landing .hu-privacy li{font-size:15px;line-height:1.8}
#hu-landing .hu-privacy .hu-muted{color:var(--hu-muted);font-size:13px;margin-top:8px}
#hu-landing .hu-privacy ul{margin:8px 0 0;padding-left:1.2em}
#hu-landing .hu-privacy li{margin:4px 0}
#hu-landing .hu-clips { display: grid; grid-template-columns: minmax(220px, 280px) 1fr; gap: 44px; align-items: center; }
#hu-landing .hu-clip-list .hu-step { position: relative; overflow: hidden; }
#hu-landing .hu-clip-list .hu-step strong { margin-bottom: 0; }
#hu-landing .hu-clip-progress { position: absolute; left: -2px; top: 0; width: 2px; height: 100%; background: var(--hu-ink); transform: scaleY(var(--p, 0)); transform-origin: top; opacity: 0; }
#hu-landing .hu-clip-list .hu-step[aria-pressed=true] .hu-clip-progress { opacity: .55; }
#hu-landing .hu-clip-stage { position: relative; aspect-ratio: 16 / 10; min-width: 0; border-radius: 16px; overflow: hidden; background: var(--hu-soft); box-shadow: 0 0 0 1px var(--hu-line), 0 24px 48px var(--hu-shadow); }
#hu-landing .hu-clip-stage video { display: block; width: 100%; height: 100%; object-fit: cover; }
#hu-landing .hu-clip-toggle { position: absolute; right: 14px; bottom: 14px; display: grid; place-items: center; width: 40px; height: 40px; padding: 0; border: 0; border-radius: 50%; background: rgb(21 35 47 / .72); color: #fff; cursor: pointer; }
#hu-landing .hu-clip-toggle:hover { background: rgb(21 35 47 / .88); }
#hu-landing .hu-clip-toggle[data-state=playing] .hu-icon-play, #hu-landing .hu-clip-toggle[data-state=paused] .hu-icon-pause { display: none; }
@media(max-width:680px) {
  #hu-landing .hu-clips { grid-template-columns: 1fr; gap: 18px; }
  #hu-landing .hu-clip-list { display: grid; grid-template-columns: 1fr 1fr; gap: 6px; order: 1; }
  #hu-landing .hu-clip-list .hu-step { grid-template-columns: 22px 1fr; gap: 8px; padding: 12px 10px; }
  #hu-landing .hu-clip-list .hu-step strong { font-size: 14px; }
  #hu-landing .hu-clip-stage { border-radius: 12px; }
}