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12px;font-size:14px;display:block}.lab__mobile-bar{border-top:1px solid var(--line);background:var(--panel);z-index:41;flex:none;justify-content:space-between;align-items:center;gap:8px;padding:6px 10px;display:flex;position:relative}.lab__mobile-bar .btn{padding:9px 14px}.lab__backdrop{z-index:39;cursor:pointer;background:#03060980;border:none;padding:0;display:block;position:fixed;inset:0}.lab__mobile-current{color:var(--ink-dim);text-overflow:ellipsis;white-space:nowrap;font-size:12.5px;overflow:hidden}.lab-toolbar{scrollbar-width:thin;-webkit-overflow-scrolling:touch;flex-wrap:nowrap;gap:10px;padding:7px 10px;overflow:auto hidden}.lab-toolbar__group{border-right:none;flex:none;padding:0}.lab-toolbar__group--perf{margin-left:0}.perf-readout{display:none}.lab-toolbar__label,.view-btn,.segmented__item,.switch,.btn,.lab-toolbar__select span{white-space:nowrap}.view-btn,.segmented__item{padding:9px 11px;font-size:12.5px}.btn--sm{padding:9px 12px;font-size:12.5px}.switch{padding:8px 0;font-size:12.5px}.switch__track{width:34px;height:20px}.switch__thumb{width:14px;height:14px}.switch.is-on .switch__thumb{transform:translate(14px)}.inline-slider input[type=range]{width:84px}.playback{flex-wrap:wrap;align-items:center;gap:6px;padding:6px 10px;display:flex}.playback__transport{flex-wrap:nowrap;order:1}.playback__transport .btn{padding:8px 10px}.playback__slider{flex:140px;order:2;min-width:0}.playback__stages{scrollbar-width:none;flex-wrap:nowrap;flex:100%;order:3;padding-bottom:2px;overflow-x:auto}.playback__stages::-webkit-scrollbar{display:none}.stage-pill{flex:none}.playback__opts{flex:100%;order:4;justify-content:space-between;font-size:12.5px}.playback__opt input[type=range]{width:100px}.viewer-hud__hint{display:none}.knowledge,.relations{grid-template-columns:minmax(0,1fr)}.knowledge__nav,.relations__filter{position:static}.knowledge__cats button,.relations__filter button{padding:10px;font-size:13.5px}.lesson-overlay{left:8px;right:8px;bottom:calc(8px + env(safe-area-inset-bottom));width:auto;max-height:56vh;position:fixed}.quiz-option{padding:11px 12px;font-size:13.5px}.tree-row{min-height:42px}.tree-row__main{padding:6px 2px;font-size:13.5px}.tree-row__caret{width:26px;font-size:13px}.tree-row__ops{opacity:1}.tree-row__ops .icon-btn{padding:6px 8px;font-size:14px}.part-tree__search,.part-tree__filter{padding:9px 10px;font-size:13.5px}.shell__foot{padding-bottom:calc(6px + env(safe-area-inset-bottom))}.shell__foot-full{display:none}.shell__foot-compact{display:block}.home__hero-viewer .hero-viewer{height:min(46vh,380px);min-height:260px}.home{padding:22px 16px 40px}.index-row{grid-template-columns:minmax(0,1fr) auto;gap:6px 14px;padding:14px 2px}.index-row__desc{grid-column:1/-1}}@media (width<=900px) and (height<=520px){.playback__stages,.playback__opts,.shell__foot{display:none}.lab__mobile-bar{padding:4px 10px}.viewer-hud{top:6px;right:6px}.lab__col--left,.lab__col--right{max-height:78vh}}@media (width>=901px) and (width<=1180px){.lab__body{grid-template-columns:240px minmax(0,1fr) 300px}}@media (width<=560px){.eng-table{font-size:11.5px}.shell__foot{flex-direction:column;gap:2px}}@media (prefers-reduced-motion:reduce){*,:before,:after{transition-duration:.001ms!important;animation-duration:.001ms!important}}:root{--vp-panel:#fffffff2;--vp-line:#0000001f;--vp-ink:#1d1d1f;--vp-muted:#6e6e73;--vp-accent:#0b62d0;--vp-accent-dim:#0b62d01a;--vp-warn:#1d1d1f;--vp-shadow:0 8px 24px #00000017;--vp-scrim-solid:#fffffff2;--vp-scrim-fade:#fff0;--vp-stage:#eef2f6}[data-theme=dark]{--vp-panel:#0c0d0feb;--vp-line:#ffffff24;--vp-ink:#f2f3f5;--vp-muted:#a9adb3;--vp-accent:#7ab6ff;--vp-accent-dim:#7ab6ff1f;--vp-warn:#f2f3f5;--vp-shadow:0 10px 30px #00000080;--vp-scrim-solid:#08090af0;--vp-scrim-fade:#08090a00;--vp-stage:#04060a}[data-theme=light] .part-label__leader{stroke:var(--vp-accent);opacity:.85}[data-theme=light] .part-label__dot{fill:var(--vp-accent)}[data-theme=light] .part-label__chip{background:var(--vp-panel);border-color:var(--vp-accent);box-shadow:var(--vp-shadow)}[data-theme=light] .part-label__zh{color:var(--vp-ink)}[data-theme=light] .part-label__en{color:var(--vp-muted)}[data-theme=light] .conn-chip{background:var(--vp-panel);box-shadow:var(--vp-shadow)}[data-theme=light] .conn-chip__label{color:var(--vp-ink)}[data-theme=light] .measure-readout,[data-theme=light] .measure-hint{background:var(--vp-panel);color:var(--vp-ink);box-shadow:var(--vp-shadow)}[data-theme=light] .measure-readout__value{color:var(--vp-warn)}[data-theme=light] .viewer-hud__btn,[data-theme=light] .viewer-hud__msg,[data-theme=light] .viewer-hud__hint{background:var(--vp-panel);border-color:var(--vp-line);color:var(--vp-ink);box-shadow:var(--vp-shadow)}[data-theme=light] .viewer-hud__btn:hover:not(:disabled){border-color:var(--vp-accent);color:var(--vp-accent)}[data-theme=light] .viewer-fallback{color:var(--vp-ink)}[data-theme=light] .viewer-fallback__reason{color:var(--vp-warn)}[data-theme=light] .viewer-fallback ul,[data-theme=light] .viewer-fallback__hint{color:var(--vp-muted)}[data-theme=light] .warmup{background:#ffffffe0}[data-theme=light] .warmup__card{border-color:var(--vp-line);box-shadow:var(--vp-shadow);background:#fff}[data-theme=light] .warmup__title{color:var(--vp-ink)}[data-theme=light] .warmup__bar{background:#10202c1a}[data-theme=light] .warmup__bar span{background:var(--vp-accent)}[data-theme=light] .warmup__stats>div{border-color:var(--vp-line)}[data-theme=light] .warmup__stats dt,[data-theme=light] .warmup__note{color:var(--vp-muted)}[data-theme=light] .warmup__stats dd{color:var(--vp-accent)}[data-theme=light] .lesson-overlay{border-color:var(--vp-accent);box-shadow:var(--vp-shadow);background:#fffffff7}[data-theme=light] .lesson-overlay__head h3,[data-theme=light] .lesson-overlay__brief,[data-theme=light] .lesson-body__hints,[data-theme=light] .lesson-body__feedback,[data-theme=light] .lesson-body__hintline,[data-theme=light] .lesson-body__wrong-list,[data-theme=light] .quiz-prompt{color:var(--vp-ink)}[data-theme=light] .lesson-overlay__close{color:var(--vp-ink);border-color:var(--vp-line)}[data-theme=light] .lesson-body__feedback{border-left-color:var(--vp-line);background:#10202c0a}[data-theme=light] .quiz-option{border-color:var(--vp-line);color:var(--vp-ink);background:#10202c08}[data-theme=light] .quiz-option__mark{color:var(--vp-muted)}[data-theme=light] .quiz-option.is-picked{background:var(--vp-accent-dim);border-color:var(--vp-accent)}[data-theme=light] .story__progress{background:#10202c1a}[data-theme=light] .story__progress span{background:var(--vp-accent)}[data-theme=light] .story__chapter-index,[data-theme=light] .story__chapter-sub{color:var(--vp-accent)}[data-theme=light] .story__scrollhint,[data-theme=light] .story__step{color:var(--vp-muted)}[data-theme=light] .story__step-dot{background:#fffc;border-color:#10202c59}[data-theme=light] .story__step.is-active .story__step-dot{background:var(--vp-accent);border-color:var(--vp-accent)}[data-theme=light] .story__step.is-active .story__step-label{color:var(--vp-accent)}[data-theme=light] .story__picked{border-color:var(--vp-line);border-left-color:var(--vp-accent);color:var(--vp-ink);box-shadow:var(--vp-shadow);background:#fffffff0}[data-theme=light] .story__picked .muted,[data-theme=light] .story__picked-hint{color:var(--vp-muted)}[data-theme=light] .story__foot .btn{color:#fff;background:#10202c;border-color:#10202c}[data-theme=light] .story__foot .btn:hover{background:#0e7490;border-color:#0e7490}.viewer-canvas-wrap,.hero-viewer{touch-action:none;overscroll-behavior:contain}.story{--story-p:0;background:var(--vp-stage);overscroll-behavior-y:contain;height:100%;position:relative;overflow:hidden auto}.story__sticky{height:100%;position:sticky;top:0;overflow:hidden}.story__spacer{height:420%}.story-canvas{touch-action:pan-y;position:absolute;inset:0}.story-canvas canvas{display:block;width:100%!important;height:100%!important}.story__hud{pointer-events:none;opacity:1;transition:opacity .4s;position:absolute;inset:0}.story__hud>*{pointer-events:auto}.story__hud:not(.is-ready){opacity:.25;pointer-events:none}.story__progress{background:#80808038;height:2px;position:absolute;top:0;left:0;right:0}.story__progress span{background:var(--accent);transform-origin:0;will-change:transform;height:100%;display:block;transform:scaleX(0)}.story__chapters{width:min(420px,38vw);position:absolute;top:50%;left:clamp(18px,4vw,64px);transform:translateY(-50%)}.story__chapter{opacity:0;pointer-events:none;transition:opacity .45s,transform .45s;position:absolute;top:50%;left:0;transform:translateY(-50%)translateY(14px)}.story__chapter.is-active{opacity:1;pointer-events:auto;transform:translateY(-50%)}.story__chapter-index{letter-spacing:.3em;color:var(--accent);margin-bottom:6px;font-size:12px;display:block}.story__chapter h2{color:var(--vp-ink);margin:0 0 4px;font-size:clamp(20px,2.4vw,30px);line-height:1.2}.story__chapter-sub{color:var(--accent);margin:0 0 10px;font-size:13px}.story__chapter-body{color:var(--vp-muted);margin:0 0 12px;font-size:14px;line-height:1.75}.story__chapter-meta{align-items:center;gap:10px;display:flex}.story__steps{flex-direction:column;gap:10px;display:flex;position:absolute;top:50%;right:clamp(14px,2.4vw,34px);transform:translateY(-50%)}.story__step{color:var(--muted);cursor:pointer;font:inherit;background:0 0;border:none;align-items:center;gap:8px;padding:4px 2px;display:flex}.story__step-dot{border:1px solid var(--line-2);background:0 0;border-radius:50%;width:8px;height:8px;transition:background .25s,border-color .25s,transform .25s}.story__step.is-active .story__step-dot{background:var(--accent);border-color:var(--accent);transform:scale(1.35)}.story__step-label{font-family:var(--mono);font-size:11px}.story__step.is-active .story__step-label{color:var(--accent)}.story__step:hover 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.btn{text-decoration:none}.warmup{-webkit-backdrop-filter:blur(3px);backdrop-filter:blur(3px);z-index:10;background:#05070adb;justify-content:center;align-items:center;display:flex;position:absolute;inset:0}.warmup__card{border:1px solid var(--line-2);border-radius:var(--radius);background:var(--panel);width:min(420px,86vw);padding:18px 20px}.warmup__title{color:var(--ink);margin-bottom:10px;font-size:15px}.warmup__bar{background:var(--line);border-radius:999px;height:3px;margin-bottom:14px;overflow:hidden}.warmup__bar span{background:var(--accent);height:100%;transition:width .18s linear;display:block}.warmup__stats{grid-template-columns:repeat(4,1fr);gap:8px;margin:0 0 12px;display:grid}.warmup__stats>div{text-align:center;border:1px solid var(--line);border-radius:3px;padding:6px 2px}.warmup__stats dt{color:var(--muted);font-size:10px}.warmup__stats dd{font-family:var(--mono);color:var(--accent);margin:0;font-size:15px}.warmup__note{color:var(--muted);margin:0;font-size:12px;line-height:1.6}@media (width<=900px){.story__chapters{background:linear-gradient(to top, var(--vp-scrim-solid) 0%, var(--vp-scrim-solid) 62%, var(--vp-scrim-fade) 100%);width:auto;padding:22px 16px 4px;inset:auto 0 118px;transform:none}.story__chapter{top:auto;bottom:0;transform:translateY(14px)}.story__chapter.is-active{transform:translateY(0)}.story__chapter-body{-webkit-line-clamp:3;-webkit-box-orient:vertical;font-size:13px;line-height:1.65;display:-webkit-box;overflow:hidden}.story__steps{z-index:2;flex-direction:row;gap:6px;inset:auto auto 86px 16px;transform:none}.story__step{padding:8px 4px}.story__step-label{display:none}.story__step-dot{width:10px;height:10px}.story__scrollhint{bottom:96px;left:16px}.story__foot{align-items:center;bottom:14px;left:14px;right:14px}.story__picked{flex:1;max-width:100%}.warmup__card{padding:16px}}@media (width<=900px) and (height<=520px){.story__chapters{bottom:76px}.story__chapter-body{display:none}.story__steps{bottom:62px}.story__scrollhint{display:none}.story__foot{bottom:8px}.story__picked-hint{display:none}}@property --tw-rotate-x{syntax:"*";inherits:false}@property --tw-rotate-y{syntax:"*";inherits:false}@property --tw-rotate-z{syntax:"*";inherits:false}@property --tw-skew-x{syntax:"*";inherits:false}@property --tw-skew-y{syntax:"*";inherits:false}@property --tw-border-style{syntax:"*";inherits:false;initial-value:solid}@property --tw-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-shadow-color{syntax:"*";inherits:false}@property --tw-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-inset-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-inset-shadow-color{syntax:"*";inherits:false}@property --tw-inset-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-ring-color{syntax:"*";inherits:false}@property --tw-ring-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-inset-ring-color{syntax:"*";inherits:false}@property --tw-inset-ring-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-ring-inset{syntax:"*";inherits:false}@property --tw-ring-offset-width{syntax:"<length>";inherits:false;initial-value:0}@property --tw-ring-offset-color{syntax:"*";inherits:false;initial-value:#fff}@property --tw-ring-offset-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-outline-style{syntax:"*";inherits:false;initial-value:solid}@property --tw-blur{syntax:"*";inherits:false}@property --tw-brightness{syntax:"*";inherits:false}@property --tw-contrast{syntax:"*";inherits:false}@property --tw-grayscale{syntax:"*";inherits:false}@property --tw-hue-rotate{syntax:"*";inherits:false}@property --tw-invert{syntax:"*";inherits:false}@property --tw-opacity{syntax:"*";inherits:false}@property --tw-saturate{syntax:"*";inherits:false}@property --tw-sepia{syntax:"*";inherits:false}@property --tw-drop-shadow{syntax:"*";inherits:false}@property --tw-drop-shadow-color{syntax:"*";inherits:false}@property --tw-drop-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-drop-shadow-size{syntax:"*";inherits:false}