:root{--blue:#0a5eb5;--blue-dark:#083d7a;--ink:#172b49;--muted:#586c87;--bg:#f3f6fb;--line:#dce5f0;--good:#177b65;--error:#b94351;--key-height:clamp(24px,4dvh,37px);--card-width:clamp(104px,28vw,280px)}
*{box-sizing:border-box}html,body{height:100%;margin:0}body{height:100dvh;display:flex;flex-direction:column;background:var(--bg);color:var(--ink);font:14px/1.5 -apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",Arial,sans-serif;overflow:hidden}button,input,select{font:inherit}button,a,input,select{-webkit-tap-highlight-color:transparent}button{cursor:pointer}button:disabled{opacity:.5;cursor:not-allowed}a{color:inherit;text-decoration:none}button:focus-visible,a:focus-visible,select:focus-visible,summary:focus-visible{outline:3px solid #7db9f3;outline-offset:3px}[hidden]{display:none!important}.sr-only{position:absolute;width:1px;height:1px;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap}h1,h2,p{margin:0}
.site-header{flex:none;height:62px;padding:0 max(24px,calc((100vw - 1120px)/2));display:flex;align-items:center;justify-content:space-between;gap:16px;border-bottom:1px solid var(--line);background:#fff}.brand{display:flex;align-items:center;gap:10px;color:var(--blue-dark);font-size:16px;font-weight:750;line-height:1.15}.brand img{object-fit:cover}.brand-sub{display:block;margin-top:5px;font-size:12px;letter-spacing:.1em;font-weight:500;color:var(--muted)}.site-header nav{display:flex;align-items:center;gap:25px;font-size:13px;color:var(--muted)}.site-header nav button{border:0;background:none;color:inherit;padding:7px 0}.site-header nav a span{margin-left:5px}
.app-shell{width:min(1040px,100%);min-height:0;flex:1;display:flex;flex-direction:column;margin:0 auto;padding:18px 24px 14px;gap:14px}.toolbar{display:flex;align-items:center;justify-content:space-between;gap:16px;flex:none}.lesson-caption{display:flex;align-items:center;gap:9px;font-size:13px;color:var(--muted)}.lesson-caption i{width:7px;height:7px;background:#70b6a2;border-radius:50%}.mode-control select{border:1px solid var(--line);border-radius:10px;color:var(--ink);background:#fff;padding:8px 28px 8px 12px;font-size:13px}
.metrics{display:grid;grid-template-columns:1.25fr 1fr 1fr 1fr;align-items:center;border:1px solid var(--line);border-radius:14px;background:#fff;flex:none;padding:12px}.metrics>div{display:flex;align-items:baseline;justify-content:center;gap:6px;border-right:1px solid var(--line);white-space:nowrap}.metrics>div:last-child{border:0}.metrics span{font-size:12px;color:var(--muted);margin-right:5px}.metrics strong{font-size:25px;line-height:1.2;font-weight:700;letter-spacing:-.025em;font-variant-numeric:tabular-nums}.metrics>div:first-child strong{color:var(--blue)}.metrics small{font-size:12px;color:var(--muted)}.metrics .wpm{margin-left:4px;font-size:12px}
.focus-stage{flex:1;min-height:0;display:flex;flex-direction:column;justify-content:center;align-items:center;text-align:center;position:relative;padding:5px 0 3px}.exercise-title{font-size:12px;color:var(--muted);font-weight:500;letter-spacing:.1em;margin-bottom:10px}.word-window{width:100%;height:clamp(120px,21dvh,180px);flex:none;position:relative;overflow:hidden;isolation:isolate}.word-window::before,.word-window::after{content:"";position:absolute;inset:0 auto 0 0;width:5%;z-index:2;background:linear-gradient(90deg,var(--bg),transparent);pointer-events:none}.word-window::after{inset:0 0 0 auto;transform:rotate(180deg)}.word-track{display:flex;position:absolute;left:50%;top:0;height:100%;width:max-content;transition:transform .29s cubic-bezier(.22,.75,.23,1);will-change:transform}.word-track.no-transition{transition:none}.word-card{display:flex;align-items:center;justify-content:center;flex-direction:column;width:var(--card-width);flex:none;gap:15px;height:100%;padding:0 7px;position:relative}.word-card .translation{font-size:15px;line-height:1.5;color:var(--muted);max-width:100%;text-wrap:balance;min-height:23px;display:flex;align-items:center;justify-content:center}.english-word{font:550 var(--preview-size,29px)/1.25 Consolas,"SFMono-Regular",monospace;letter-spacing:.02em;color:#71839d;white-space:nowrap;transition:font-size .26s ease,color .15s ease;min-height:42px;display:flex;align-items:center;justify-content:center}.word-card.active .translation{font-size:20px;color:var(--blue-dark);font-weight:550}.word-card.active .english-word{font-size:var(--active-size,66px);font-weight:650;color:#7b8da7}.english-word span{position:relative}.english-word .typed-correct{color:var(--blue-dark)}.english-word .typed-wrong{color:var(--error);text-decoration:underline;text-decoration-thickness:3px;text-underline-offset:7px}.english-word .current::before{content:"";position:absolute;left:-3px;top:9%;bottom:3%;width:3px;background:var(--blue);border-radius:2px}.word-card.previous .english-word{color:var(--good)}.word-card.solved .english-word{animation:word-nudge .16s ease-out;color:var(--good)}.word-card.solved .english-word span{color:var(--good)!important}.word-card.previous .translation{color:var(--muted)}.word-card.far{visibility:hidden}.input-wrap{position:relative;width:min(350px,calc(100% - 36px));margin-top:6px;flex:none}.input-wrap input{width:100%;height:43px;padding:9px 33px 9px 14px;border:1px solid #cad8e9;border-radius:10px;background:#fff;font:17px/1.4 Consolas,monospace;text-align:center;color:var(--ink);caret-color:var(--blue)}.input-wrap input::placeholder{font:13px/1.4 "Microsoft YaHei",sans-serif;color:var(--muted)}.input-wrap input:focus{outline:2px solid #d4e6ff;border-color:#78a9dd;outline-offset:0}.input-marker{position:absolute;right:13px;top:11px;color:var(--muted);font:16px Consolas,monospace}.input-help{font-size:12px;color:var(--muted);margin-top:8px;flex:none}.session-status{font-size:12px;color:var(--muted);height:19px;margin-top:4px;flex:none;white-space:nowrap;max-width:100%;overflow:hidden;text-overflow:ellipsis}.session-actions{display:flex;align-items:center;justify-content:center;gap:10px;margin-top:13px;flex:none}.primary-button,.secondary-button{display:inline-flex;align-items:center;justify-content:center;min-height:38px;padding:8px 17px;border-radius:9px;font-size:13px;white-space:nowrap}.primary-button{color:#fff;background:var(--blue);border:1px solid var(--blue);font-weight:650;min-width:105px}.primary-button:hover{background:var(--blue-dark)}.secondary-button{border:1px solid var(--line);background:#fff;color:var(--ink);min-width:65px}.text-button{border:0;background:transparent;color:var(--muted);font-size:12px;padding:5px 7px;white-space:nowrap}.text-button:hover{color:var(--blue)}.inline-results{min-height:130px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:10px}.inline-results h2{font-size:29px;color:var(--blue-dark)}.inline-results p{font-size:13px;color:var(--muted)}
.keyboard-panel{width:min(850px,100%);margin:auto auto 0;flex:none}.keyboard-heading{display:flex;align-items:center;gap:12px;padding:0 4px 8px;min-height:27px}.keyboard-heading h2{font-size:12px;font-weight:650;color:var(--ink);flex:none}.keyboard-heading #keyHint{font-size:12px;color:var(--muted);min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.keyboard-heading button{margin-left:auto;padding:2px 0}.keyboard{padding:10px;background:#e9eef5;border:1px solid #dae3ee;border-radius:13px}.keyboard-row{display:flex;gap:5px;margin-bottom:5px}.keyboard-row:last-child{margin:0}.key{display:flex;justify-content:center;align-items:center;flex:var(--grow,1);min-width:0;height:var(--key-height);border:1px solid #cdd7e2;border-bottom:3px solid #c5d0dd;background:#fff;border-radius:6px;font:13px Consolas,monospace;color:#40556c;position:relative;user-select:none}.key.wide{font-size:12px}.key.finger-pinky{background:#f4e7f5}.key.finger-ring{background:#e5ebff}.key.finger-middle{background:#dceee9}.key.finger-index{background:#f9eada}.key[data-code=KeyF]::after,.key[data-code=KeyJ]::after{content:"";position:absolute;width:10px;height:2px;bottom:3px;background:#8394aa;border-radius:1px}.key.next-key{background:var(--blue)!important;border-color:#08498a;color:white;box-shadow:0 0 0 2px #c8ddff}.key.pressed{background:#cfe6ff!important;border-bottom-width:1px;transform:translateY(1px);color:var(--blue-dark)}.key.hit-good{background:#84d7c0!important;color:#174e40}.key.hit-wrong{background:#f5bec7!important;color:#792b39}.keyboard.word-success{animation:keyboard-nudge .16s ease-out}.finger-legend{display:flex;align-items:center;gap:13px;padding:8px 3px 0;font-size:12px;color:var(--muted)}.finger-legend span{display:flex;align-items:center;gap:4px}.finger-legend i{display:block;width:7px;height:7px;border-radius:2px}.finger-legend .pinky{background:#ddbae3}.finger-legend .ring{background:#b6c9f2}.finger-legend .middle{background:#9dd1c4}.finger-legend .index{background:#e8bd90}.finger-legend .thumb{background:#c8d2df}.legend-note{margin-left:auto}
.site-footer{height:35px;flex:none;display:flex;justify-content:space-between;align-items:center;gap:16px;padding:0 max(24px,calc((100vw - 1040px)/2));font-size:12px;color:var(--muted);border-top:1px solid var(--line)}.filings{display:flex;align-items:center;gap:16px}.filings a{display:flex;align-items:center;gap:5px;white-space:nowrap}.filings img{display:block;object-fit:contain}
dialog{width:min(470px,calc(100vw - 32px));max-height:calc(100dvh - 36px);padding:24px;border:1px solid var(--line);border-radius:17px;color:var(--ink);background:#fff;overflow:auto;box-shadow:0 25px 100px #142b4940}dialog::backdrop{background:#172b4955;backdrop-filter:blur(3px)}.dialog-header{display:flex;justify-content:space-between;align-items:center;gap:15px;margin-bottom:16px}.dialog-header h2{font-size:20px}.dialog-close{border:0;border-radius:7px;background:#eef3f9;min-width:32px;height:32px;color:var(--muted);font-size:25px;line-height:1}.field{margin-bottom:17px}.field label{display:block;font-size:13px;font-weight:650;margin-bottom:7px}.field label span{font-weight:400;color:var(--muted);margin-left:5px}.field input,.field select{width:100%;padding:10px 11px;font-size:14px;border:1px solid var(--line);border-radius:8px;background:#fafcff;color:var(--ink)}.field input:focus,.field select:focus{outline:2px solid #bdd9fb;outline-offset:0}.check-row{display:flex;gap:20px;font-size:13px;flex-wrap:wrap}.check-row label{display:flex;align-items:center;gap:6px}.check-row input{width:16px;height:16px;accent-color:var(--blue);margin:0}.dialog-note{font-size:12px;color:var(--muted);margin:14px 0;line-height:1.8}.history-dialog{width:min(880px,calc(100vw - 32px))}.history-actions{display:flex;align-items:center;gap:10px}.history-empty{text-align:center;padding:30px 0;color:var(--muted);font-size:14px}.table-scroll{overflow:auto;max-height:45dvh;margin:20px 0 12px}table{width:100%;min-width:610px;border-collapse:collapse;font-size:13px;text-align:left}th,td{padding:11px 12px;border-bottom:1px solid #e9eef5;white-space:nowrap}th{background:#f1f5fa;color:var(--muted);font-size:12px;font-weight:500;position:sticky;top:0}td small{display:block;font-size:12px;color:var(--muted);margin-top:3px}.history-speed{color:var(--blue-dark);font-weight:650}.stats-explainer{padding-top:12px;border-top:1px solid var(--line);font-size:12px;color:var(--muted)}.stats-explainer summary{cursor:pointer}.stats-explainer p{margin-top:10px;line-height:1.8}.storage-notice{font-size:12px;color:#806121;background:#fff3da;border-radius:7px;padding:9px;margin-top:12px}.noscript-note{position:fixed;bottom:0;left:0;right:0;padding:14px;text-align:center;background:#fff0cb}
.sound-controls{display:flex;align-items:center;gap:10px;margin-top:18px;padding-top:16px;border-top:1px solid var(--line);font-size:13px}.sound-controls label{flex:none}.sound-controls input{min-width:40px;flex:1;width:80px;accent-color:var(--blue);height:32px;cursor:pointer}.sound-controls input:focus-visible{outline:3px solid #7db9f3;outline-offset:2px}.sound-controls input:disabled{opacity:.5;cursor:not-allowed}.sound-controls output{min-width:36px;text-align:right;font-variant-numeric:tabular-nums;color:var(--muted)}.sound-controls button{padding:7px 10px;min-width:0}.sound-status{font-size:12px;color:var(--muted);line-height:1.7;margin-top:6px;min-height:21px}
@media(max-width:350px){.sound-controls{flex-wrap:wrap}.sound-controls input{min-width:80px}.sound-controls button{margin-left:auto}}
@keyframes word-nudge{0%,100%{transform:translate3d(0,0,0)}25%{transform:translate3d(-2px,0,0)}55%{transform:translate3d(2px,1px,0)}80%{transform:translate3d(-1px,0,0)}}
@keyframes keyboard-nudge{0%,100%{transform:translate3d(0,0,0)}30%{transform:translate3d(.8px,1px,0)}65%{transform:translate3d(-.8px,0,0)}}
@media(max-width:950px){.metrics .wpm{display:none}.metrics>div{gap:5px}.metrics span{margin-right:2px}.site-footer{justify-content:center}.footer-name{display:none}.app-shell{gap:11px;padding-block:14px 10px}.site-header{height:55px}}
@media(max-width:600px){:root{--key-height:clamp(20px,3.6dvh,30px)}.site-header{height:52px;padding:0 16px}.brand{gap:8px;font-size:15px}.brand img{width:28px;height:28px}.brand-sub{display:none}.site-header nav{gap:16px;font-size:12px}.site-header nav a{font-size:0}.site-header nav a span{font-size:16px;margin:0}.app-shell{padding:12px 14px 9px;gap:9px}.toolbar{gap:9px}.lesson-caption{font-size:12px;gap:6px}.mode-control select{padding:6px 24px 6px 9px;font-size:12px}.metrics{padding:9px 4px}.metrics>div{flex-wrap:wrap;gap:1px 3px;line-height:1.3}.metrics span{width:100%;margin:0 0 4px;font-size:12px}.metrics strong{font-size:22px}.metrics small{font-size:12px}.metrics>div:first-child small{width:100%;margin-top:3px}.metrics>div:first-child strong{font-size:24px}.exercise-title{margin-bottom:5px}.word-window{height:clamp(105px,19dvh,145px)}.word-card{gap:13px}.word-card .translation{font-size:12px;min-height:36px;align-items:flex-end}.word-card.active .translation{font-size:15px}.english-word{min-height:38px}.english-word .typed-wrong{text-underline-offset:5px;text-decoration-thickness:2px}.word-window::before,.word-window::after{width:2%}.input-wrap{width:min(290px,calc(100% - 24px));margin-top:3px}.input-wrap input{height:39px;font-size:17px}.input-marker{top:9px}.input-help{margin-top:7px}.session-actions{margin-top:10px;gap:7px}.primary-button,.secondary-button{min-height:35px;padding:6px 12px}.keyboard-heading{gap:7px;padding:0 2px 6px}.keyboard-heading h2{display:none}.keyboard{padding:6px;border-radius:10px}.keyboard-row{gap:3px;margin-bottom:4px}.key{font-size:12px;border-radius:4px;border-bottom-width:2px}.key.wide{font-size:12px;letter-spacing:-.08em}.finger-legend{gap:10px;justify-content:center;padding-top:6px;font-size:12px}.legend-note{display:none!important}.site-footer{height:45px;padding:4px 12px}.filings{flex-direction:column;gap:1px;font-size:12px;line-height:1.45}.filings img{width:14px;height:16px}dialog{padding:20px}.inline-results{min-height:105px}.inline-results h2{font-size:24px}.inline-results p{font-size:12px}}
@media(max-height:680px){.app-shell{padding-block:8px;gap:7px}.site-header{height:48px}.metrics{padding-block:7px}.metrics strong{font-size:22px}.focus-stage{padding-block:0}.word-window{height:100px}.exercise-title{margin-bottom:2px}.input-wrap{margin-top:0}.input-help{margin-top:4px}.session-status{margin-top:0}.session-actions{margin-top:7px}.keyboard-heading{padding-bottom:4px}.finger-legend{padding-top:5px}.site-footer{height:31px}.filings{flex-direction:row;gap:10px;font-size:12px}.keyboard{padding:6px}.keyboard-row{gap:3px;margin-bottom:3px}.key{height:23px}}
@media(max-height:550px){.site-footer{display:none}.brand-sub{display:none}.app-shell{padding:5px 14px;gap:5px}.metrics{padding-block:5px}.metrics>div{flex-wrap:nowrap}.metrics span{width:auto;margin:0}.metrics>div:first-child small{width:auto;margin:0}.metrics strong{font-size:19px!important}.exercise-title,.input-help,.finger-legend{display:none}.word-window{height:83px}.word-card{gap:3px}.word-card .translation{min-height:23px}.word-card.active .translation{font-size:14px}.input-wrap input{height:33px}.input-marker{top:6px}.session-actions{margin-top:3px}.session-status{height:16px}.primary-button,.secondary-button{min-height:30px;padding:4px 11px}.keyboard-heading{min-height:20px}.keyboard{padding:5px}.key{height:20px}.keyboard-row{margin-bottom:2px}.site-header{height:40px}.keyboard-panel{max-width:760px}}
.word-card .english-word{color:var(--muted)}.word-card.active .english-word{color:var(--muted)}.word-card.previous .english-word .typed-correct{color:var(--good)}
@media(min-width:601px) and (max-height:850px){.app-shell{padding-block:12px 10px;gap:10px}.exercise-title{display:none}.word-window{height:120px}.keyboard{padding:8px}.keyboard-row{margin-bottom:4px}.key{height:27px}.keyboard-heading{padding-bottom:6px}.finger-legend{padding-top:6px}.input-wrap{margin-top:4px}.input-wrap input{height:40px}.input-help{margin-top:4px}.session-status{margin-top:0}.session-actions{margin-top:9px}}
@media(max-height:600px){.site-footer{display:none}.brand-sub,.exercise-title,.input-help,.finger-legend{display:none}.site-header{height:40px}.app-shell{padding:5px 14px;gap:5px}.metrics{padding-block:5px}.metrics>div{flex-wrap:nowrap}.metrics span{width:auto;margin:0}.metrics>div:first-child small{width:auto;margin:0}.metrics strong{font-size:19px!important}.word-window{height:83px}.word-card{gap:3px}.word-card .translation{min-height:23px}.word-card.active .translation{font-size:14px}.input-wrap input{height:33px}.input-marker{top:6px}.session-actions{margin-top:3px}.session-status{height:16px}.primary-button,.secondary-button{min-height:30px;padding:4px 11px}.keyboard-heading{min-height:20px}.keyboard{padding:5px}.key{height:20px}.keyboard-row{margin-bottom:2px}.keyboard-panel{max-width:760px}}
@media(max-height:450px){.keyboard-row:first-child,.keyboard-row:last-child{display:none}.word-window{height:76px}.toolbar{max-height:28px}.mode-control select{padding-block:4px}.inline-results{min-height:70px}.metrics span{display:none}.metrics strong{font-size:18px!important}}
@media(max-width:600px) and (max-height:600px){.metrics{min-height:68px}.metrics>div{flex-wrap:wrap}.metrics span{display:block;width:100%;margin-bottom:3px;text-align:center}.metrics>div:first-child small{width:100%}.metrics strong{font-size:21px!important}}
@media(max-height:450px){.session-status{display:none}.word-window{height:65px}.inline-results{min-height:65px}}
@media(max-width:600px){.site-header nav a{font-size:12px}.home-text{display:none}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{animation:none!important;transition:none!important}.key.pressed{transform:none}}