@font-face{font-family:Silkscreen;src:url('/assets/silkscreen.ttf') format('truetype');font-display:swap}
@font-face{font-family:Fusion;src:url('/assets/fusion-pixel-12px-proportional-zh_hans.otf.woff2') format('woff2');font-display:swap}
:root{--ink:#252525;--muted:#626262;--paper:#ececec;--panel:#dfdfdf;--desk:#c1c1c1;--line:#838383;--light:#f8f8f8;--mono:'SFMono-Regular',Consolas,monospace;--pixel:Fusion,monospace;--body:-apple-system,BlinkMacSystemFont,'PingFang SC','Microsoft YaHei',sans-serif}
*{box-sizing:border-box}body{margin:0;color:var(--ink);font:16px/1.5 var(--body);background:var(--desk);background-image:radial-gradient(#9999991f 1px,transparent 1px);background-size:4px 4px}button,input,textarea{font:inherit;color:inherit}button,a,input,textarea{-webkit-tap-highlight-color:transparent}button{cursor:pointer}button:disabled{cursor:not-allowed;opacity:.48}button:focus-visible,a:focus-visible,input:focus-visible,textarea:focus-visible{outline:3px solid var(--ink);outline-offset:3px}button{border-radius:0}a{color:inherit}button:hover:not(:disabled){filter:brightness(.94)}button:active:not(:disabled){transform:translate(1px,1px)}[hidden]{display:none!important}.pixel{font-family:Silkscreen,var(--mono);font-weight:400}.icon{width:24px;height:24px;fill:currentColor;flex-shrink:0;vertical-align:middle;shape-rendering:crispEdges}.icon.small{width:18px;height:18px}.desktop-bar{min-height:68px;padding:0 32px;display:flex;align-items:center;justify-content:space-between;gap:20px;border-bottom:2px solid var(--ink);background:var(--paper)}.brand{display:flex;align-items:center;gap:12px;text-decoration:none;white-space:nowrap}.brand>.icon{width:32px;height:32px}.brand>.pixel{font-size:26px;letter-spacing:-1px}.brand-label{font:18px var(--pixel);border-left:1px solid var(--line);padding-left:16px;margin-left:6px}.desktop-right{display:flex;align-items:center;gap:18px;font-size:13px}.edition{font-size:12px}.divider{height:18px;border-left:1px solid var(--line)}.save-state{font-family:var(--pixel);font-size:16px}.save-state:before{content:'■';font-size:10px;padding-right:8px}.mobile-menu{display:none!important}.workspace{max-width:1512px;margin:28px auto 22px;padding:0 32px;display:grid;grid-template-columns:252px minmax(0,1fr);gap:32px;align-items:start}.window{border:2px solid var(--ink);background:var(--paper);box-shadow:4px 4px 0 #757575}.window-title{min-height:35px;display:flex;align-items:center;justify-content:space-between;gap:12px;padding:5px 12px;border-bottom:2px solid var(--ink);font-family:var(--pixel);font-size:16px;background:var(--panel);box-shadow:inset 1px 1px 0 var(--light)}.window-title>.pixel{font-size:11px;letter-spacing:1px}.window-title.dark{background:var(--ink);color:var(--paper);box-shadow:none}.window-title.dark>span:first-child{display:flex;align-items:center;gap:8px;min-width:0}.window-title.dark #film-title{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.window-title.dark>.pixel{font-size:12px;white-space:nowrap}.archive{position:sticky;top:24px}.archive-intro{padding:22px 18px 19px;border-bottom:1px solid var(--line)}.eyebrow{font-size:11px;letter-spacing:1px;color:var(--muted)}.collection-count{display:flex;align-items:baseline;gap:10px;margin:8px 0 14px}.collection-count strong{font:38px Silkscreen;line-height:1.1}.collection-count>span{font:14px var(--mono);color:var(--muted)}.segmented-meter{height:12px;display:flex;gap:3px}.segmented-meter i{flex:1;background:#c6c6c6;border:1px solid #b0b0b0}.segmented-meter i.filled{background:var(--ink);border-color:var(--ink)}.archive-tabs{display:flex;padding:13px 12px 11px;gap:2px}.archive-tabs button{flex:1;border:0;background:none;font:16px var(--pixel);padding:7px 2px;white-space:nowrap}.archive-tabs button.active{background:var(--ink);color:var(--paper)}.archive-tabs button span{font:11px var(--mono)}.list-heading{display:flex;justify-content:space-between;padding:7px 16px 9px;font-size:12px;color:var(--muted);border-bottom:1px solid #bababa}.chunk-list{max-height:calc(100vh - 444px);min-height:290px;overflow:auto;scrollbar-width:thin;scrollbar-color:#969696 transparent}.chunk-row{position:relative;border:0;border-bottom:1px solid #cacaca;background:transparent;display:flex;align-items:center;gap:11px;padding:13px 14px;width:100%;text-align:left;min-height:68px}.chunk-row.active{background:#c6c6c6;box-shadow:inset 4px 0 0 var(--ink)}.chunk-row>.icon{width:32px;height:32px;color:#5b5b5b}.chunk-row.active>.icon{color:var(--ink)}.chunk-row-copy{min-width:0;flex:1}.chunk-row-copy strong{display:block;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font:18px var(--pixel)}.chunk-row-copy .unlocked{font:14px/1.5 var(--mono)}.chunk-row-copy small{display:block;margin-top:3px;color:var(--muted);font:11px var(--mono)}.chunk-row .row-mark{font:12px var(--mono)}.archive-bottom{display:flex;gap:12px;align-items:center;padding:19px 15px;border-top:2px solid var(--ink);background:var(--panel)}.archive-bottom strong{font:17px var(--pixel);font-weight:400}.archive-bottom p{font-size:11px;margin:4px 0 0;color:var(--muted)}.list-empty{padding:28px 17px;font-size:14px;color:var(--muted)}.workbench{min-width:0}.lesson-heading{display:flex;justify-content:space-between;gap:20px;align-items:center;margin-bottom:22px}.lesson-heading h1{font:32px/1.35 var(--pixel);margin:5px 0 2px;letter-spacing:1px}.lesson-heading p{font-size:14px;color:#545454;margin:0}.lesson-index{text-align:right;flex-shrink:0}.lesson-index>.pixel{font-size:15px;display:block;margin-bottom:6px}.text-button{display:inline-flex;gap:4px;align-items:center;border:0;padding:2px;background:transparent;text-decoration:underline;text-underline-offset:4px;font-size:13px}.text-button .icon{width:18px;height:18px}.steps{display:flex;border:2px solid var(--ink);background:#cecece;margin-bottom:18px;min-height:39px}.step{padding:8px 16px;border-right:1px solid var(--line);font:16px var(--pixel);white-space:nowrap}.step>.pixel{font-size:12px;margin-right:6px}.step.active{background:var(--ink);color:var(--paper)}.step.done{background:var(--paper)}.steps-tail{margin-left:auto;align-self:center;padding:0 12px;font-size:10px;color:var(--muted)}.cinema{display:grid;grid-template-columns:minmax(0,1fr) 172px;gap:18px;margin-bottom:22px;align-items:start}.player-window{min-width:0;box-shadow:4px 4px 0 #757575}.screen{aspect-ratio:16/9;background:#141414;position:relative;overflow:hidden;border:5px solid #343434;border-top:0}video{display:block;width:100%;height:100%;object-fit:contain}.screen-play{position:absolute;inset:0;border:0;background:#17171742;display:flex;align-items:center;justify-content:center;flex-direction:column;gap:12px;color:#fff;font:18px var(--pixel)}.screen-play .icon{width:60px;height:60px;background:#222222e8;padding:13px;border:2px solid #ececec;box-shadow:4px 4px 0 #171717}.screen-tag{position:absolute;top:12px;left:12px;background:#141414d9;color:#ececec;padding:4px 7px;font-size:10px;pointer-events:none;letter-spacing:.5px}.subtitle-overlay{position:absolute;bottom:12px;left:12px;right:12px;color:white;font:17px/1.4 var(--body);text-align:center;pointer-events:none;text-shadow:0 1px 3px #000;background:#000b;padding:6px}.subtitle-overlay small{display:block;font-size:13px;margin-top:2px}.player-controls{display:flex;align-items:center;gap:8px;padding:9px 10px;background:#cecece;border-bottom:1px solid var(--line)}.icon-button{border:0;display:inline-flex;align-items:center;justify-content:center;background:transparent;padding:3px;min-width:30px;min-height:30px}.player-time{font:11px var(--mono);white-space:nowrap}.player-controls input{min-width:20px;flex:1;height:4px;accent-color:var(--ink);cursor:pointer}.speed-button{border:1px solid var(--line);background:var(--paper);font:12px var(--mono);padding:3px 5px;min-width:32px}.player-caption{display:flex;justify-content:space-between;gap:8px;padding:8px 12px;font-size:12px;color:var(--muted);background:#e2e2e2}.player-caption .text-button{font-size:12px;white-space:nowrap}.clip-shelf{min-width:0}.shelf-heading{display:flex;justify-content:space-between;gap:6px;border-bottom:2px solid var(--ink);padding:5px 0 10px;font:16px var(--pixel)}.shelf-heading>.pixel{font-size:12px;align-self:center}.clip-item{display:flex;gap:9px;align-items:center;padding:9px 0;width:100%;background:none;border:0;border-bottom:1px solid #a3a3a3;text-align:left;min-height:60px}.clip-item.active .clip-thumb{outline:2px solid var(--ink);outline-offset:2px}.clip-thumb{width:64px;height:39px;position:relative;flex-shrink:0;background:#9a9a9a}.clip-thumb img{width:100%;height:100%;object-fit:cover;filter:grayscale(1);display:block}.clip-item.active img{filter:none}.clip-thumb span{position:absolute;left:0;bottom:0;background:var(--ink);color:var(--paper);font:9px var(--mono);padding:0 3px}.clip-copy{min-width:0}.clip-copy strong{font-size:12px;line-height:1.4;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;font-weight:500}.clip-copy small{font:10px var(--mono);color:var(--muted)}.shelf-note{display:flex;gap:5px;align-items:center;font-size:12px;color:var(--muted);margin:12px 0 0}.exercise{box-shadow:4px 4px 0 #757575}.exercise-heading{display:flex;justify-content:space-between;gap:12px;align-items:center;padding:11px 18px;border-bottom:1px solid #a6a6a6;background:#dedede}.exercise-heading h2{font:20px var(--pixel);margin:0}.exercise-heading>.pixel{font-size:11px;color:var(--muted)}.exercise-body{padding:18px 20px 20px}.exercise-intro{margin:0 0 12px;font-size:14px;color:var(--muted)}.dictation-line{font:20px/1.6 var(--mono);margin-bottom:14px;overflow-wrap:anywhere}.gap-label{display:inline-block;border-bottom:2px dashed var(--line);min-width:100px;height:24px;vertical-align:baseline}.answer-row{display:flex;gap:12px}.answer-input{width:100%;min-width:0;flex:1;border:2px solid var(--line);background:var(--light);padding:11px 13px;font:18px/1.4 var(--mono);box-shadow:inset 2px 2px 0 #d4d4d4}.answer-input::placeholder{font:15px var(--pixel);color:#757575}.button{border:2px solid var(--ink);background:var(--panel);box-shadow:3px 3px 0 var(--ink);padding:10px 16px;font:18px var(--pixel);display:inline-flex;align-items:center;justify-content:center;gap:7px;white-space:nowrap;min-height:44px}.button.primary{background:var(--ink);color:var(--paper);box-shadow:3px 3px 0 #969696}.button.small-button{font-size:16px;padding:7px 12px;min-height:36px}.button .icon{width:20px;height:20px}.exercise-bottom{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-top:14px;flex-wrap:wrap}.exercise-bottom p{margin:0;font-size:12px;color:var(--muted)}.exercise-links{display:flex;gap:14px}.feedback{border-left:3px solid var(--ink);padding:8px 12px;margin:12px 0;font-size:14px;background:#d7d7d7}.revealed-title{font:27px/1.35 var(--mono);margin:0 0 8px;overflow-wrap:anywhere}.meaning{font-size:15px;margin:0 0 13px}.listening-note{background:#dcdcdc;padding:11px 13px;border-left:3px solid #797979;font-size:14px;line-height:1.7}.listening-note strong{display:block;font:16px var(--pixel);margin-bottom:3px}.note-code{font-family:var(--mono);background:#c5c5c5;padding:1px 3px}.source-line{font-size:14px;color:var(--muted);padding-bottom:12px;border-bottom:1px dashed #a4a4a4}.source-line strong{font-family:var(--mono);color:var(--ink);font-weight:500}.practice-prompt{font-size:16px;margin:0 0 14px;line-height:1.7}.practice-input{display:block;width:100%;min-height:88px;resize:vertical;border:2px solid var(--line);padding:12px;background:var(--light);font:17px/1.6 var(--mono);box-shadow:inset 2px 2px 0 #d4d4d4}.practice-input::placeholder{font:16px var(--pixel)}.practice-criteria{font-size:13px;color:var(--muted);margin:12px 0}.completion{display:flex;gap:20px;align-items:center}.completion>.icon{width:64px;height:64px;padding:12px;border:2px solid var(--ink);background:var(--panel)}.completion h3{font:26px var(--pixel);margin:0 0 5px}.completion p{font-size:14px;color:var(--muted);margin:0}.saved-sentence{padding:10px 14px;border:1px dashed var(--line);font:16px/1.6 var(--mono);margin:14px 0;overflow-wrap:anywhere}.workbench-footer{display:flex;justify-content:space-between;gap:12px;margin-top:16px;font-size:12px;color:#5b5b5b}.workbench-footer kbd{font:11px var(--mono);padding:1px 4px;border:1px solid var(--line);background:#d9d9d9;box-shadow:0 1px 0 var(--line);margin-right:3px}.workbench-footer kbd:not(:first-child){margin-left:12px}.desktop-footer{max-width:1512px;margin:0 auto;padding:0 32px 16px;display:flex;justify-content:space-between;gap:20px;font-size:11px;color:#636363}.desktop-footer>.pixel{font-size:10px}.toast{position:fixed;bottom:24px;left:50%;transform:translateX(-50%);border:2px solid var(--ink);background:var(--paper);box-shadow:4px 4px 0 var(--ink);padding:12px 20px;font:18px var(--pixel);z-index:20;max-width:90vw}.video-error{position:absolute;inset:0;display:grid;place-items:center;color:white;background:#161616;padding:20px;text-align:center}.step,.chunk-row,.clip-item,.button{transition:background-color .12s}::selection{background:var(--ink);color:var(--paper)}
@media(min-width:1600px){.workspace{margin-top:42px}.chunk-list{max-height:550px}.cinema{grid-template-columns:minmax(0,1fr) 196px}.clip-item{padding:12px 0}.clip-thumb{width:76px;height:45px}}
@media(max-width:1180px){.workspace{padding:0 20px;gap:22px;grid-template-columns:224px minmax(0,1fr)}.desktop-bar{padding:0 20px}.steps-tail{display:none}.cinema{grid-template-columns:minmax(0,1fr)}.clip-shelf{display:none}.lesson-heading h1{font-size:28px}.desktop-footer{padding-left:20px;padding-right:20px}.chunk-row{padding:12px}.step{flex:1;text-align:center;padding:8px}.player-time{font-size:11px}}
@media(max-width:760px){.desktop-bar{min-height:60px;padding:0 16px}.brand>.pixel{font-size:22px}.brand-label,.edition,.desktop-right .divider{display:none}.desktop-right{gap:8px}.save-state{font-size:14px}.mobile-menu{display:flex!important}.workspace{display:block;margin-top:20px;padding:0 16px}.archive{display:none;position:fixed;top:74px;bottom:20px;left:16px;right:16px;z-index:10;max-width:360px;box-shadow:10px 10px 0 #25252588}.archive.mobile-open{display:flex;flex-direction:column}.archive .chunk-list{max-height:none;min-height:0;flex:1}.archive-bottom{margin-top:auto}.lesson-heading{margin-bottom:15px;gap:10px}.lesson-heading h1{font-size:26px}.lesson-heading p{font-size:13px}.lesson-heading .eyebrow{font-size:9px}.lesson-index>.pixel{font-size:12px}.step{font-size:16px;padding:8px 4px}.step>.pixel{font-size:10px;margin-right:1px}.steps{margin-bottom:15px}.cinema{margin-bottom:18px}.player-controls{gap:5px;padding:7px}.player-caption{font-size:11px;padding:7px 9px}.exercise-body{padding:16px}.exercise-heading{padding:10px 14px}.answer-row{flex-direction:column;gap:9px}.answer-row .button{align-self:flex-end}.exercise-bottom{align-items:flex-start}.revealed-title{font-size:22px}.desktop-footer{padding:2px 16px 18px;display:block}.desktop-footer>span{display:block;margin-top:5px}.workbench-footer>span:first-child{display:none}.workbench-footer{justify-content:flex-end}.screen-tag{font-size:8px;top:8px;left:8px}.player-time{font-size:10px}.subtitle-overlay{font-size:14px;bottom:4px}.subtitle-overlay small{font-size:12px}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{transition:none!important;animation:none!important}}
.volume-caption{display:flex;justify-content:space-between;margin-top:8px;font-size:11px;color:var(--muted)}
.saved-sentence small{display:block;font:11px var(--mono);margin-top:6px;color:var(--muted)}
.shelf-note>.icon{width:18px;height:18px}
.account-dialog{padding:0;width:min(460px,calc(100vw - 32px));color:var(--ink);background:var(--paper);border:2px solid var(--ink)}.account-dialog::backdrop{background:#2229}.account-dialog form{display:grid;gap:12px}.account-dialog .answer-input{width:100%;min-width:0}.account-dialog p{font-size:14px}.account-dialog .button{justify-self:start}.save-state{cursor:pointer}
.archive-filters{padding:12px 16px;border-bottom:1px solid var(--line);display:grid;grid-template-columns:1fr 1fr;gap:10px;font-size:14px}.archive-filters label{display:grid;gap:4px;min-width:0}.archive-filters select{width:100%;min-width:0;background:var(--paper);border:1px solid var(--line);border-radius:0;padding:6px;font:inherit;color:inherit}.archive-filters .ready-filter{grid-column:1/-1;display:flex;align-items:center;gap:6px}.archive-pagination{display:flex;justify-content:space-between;align-items:center;padding:10px 16px;border-top:1px solid var(--line);font-size:14px}.chunk-row:disabled{opacity:.65}.archive-filters select:focus-visible{outline:2px solid var(--ink);outline-offset:2px}
@media(max-width:1180px){.clip-shelf{display:block}.shelf-heading{display:none}#clip-list{display:flex;gap:10px;overflow-x:auto;padding:3px 3px 8px}.clip-item{width:calc(20% - 8px);min-width:92px;flex-shrink:0;display:block;padding:0;border:0}.clip-thumb{display:block;width:100%;height:auto;aspect-ratio:16/9}.clip-copy{display:block;padding-top:5px}.clip-copy strong{font-size:11px;-webkit-line-clamp:1}.clip-copy small,.shelf-note{display:none}.cinema{gap:12px}}
@media(max-width:760px){.clip-item{min-width:84px}.completion{gap:12px}.completion>.icon{width:48px;height:48px;padding:8px}.completion h3{font-size:22px}.exercise-links{gap:10px;flex-wrap:wrap}.volume-caption{font-size:12px}}