@charset "UTF-8";
:root{--bg:#f6f7fb;--paper:#fff;--ink:#252b43;--muted:#66718a;--primary:#455bd0;--primary-dark:#3549ba;--blue:#edf0ff;--green:#eaf3ed;--yellow:#fbf3d9;--line:#e7e9f1;--radius:20px;--sans:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;--english:Georgia,"Times New Roman",serif;--ipa:Georgia,"DejaVu Sans","Arial Unicode MS",serif}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font:15px/1.65 var(--sans);-webkit-font-smoothing:antialiased}button,input,select{font:inherit}button,a,input{-webkit-tap-highlight-color:transparent}button{cursor:pointer}button:disabled{cursor:default;opacity:.45}button,a{touch-action:manipulation}button{color:inherit}button:focus-visible,a:focus-visible,input:focus-visible,summary:focus-visible{outline:3px solid #7186f2;outline-offset:4px}a{color:inherit;text-decoration:none}button{border:0;background:none}h1,h2,h3,p{margin:0}h1{font-size:30px;line-height:1.35;letter-spacing:-.8px;font-weight:650}h2{font-size:19px;font-weight:600;line-height:1.5}h3{font-size:16px;font-weight:600}input{min-width:0}svg{vertical-align:middle;flex-shrink:0}[hidden]{display:none!important}.icon{display:inline-block;flex-shrink:0}.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;top:-80px;left:20px;padding:10px 18px;z-index:200;background:white;border:2px solid var(--primary);border-radius:8px}.skip-link:focus{top:12px}
.sidebar{width:220px;position:fixed;inset:0 auto 0 0;background:#fff;display:flex;flex-direction:column;padding:37px 22px 23px;border-right:1px solid var(--line);z-index:20}.brand{display:flex;align-items:center;gap:12px;margin:0 8px 50px}.brand-mark{width:43px;height:43px;background:var(--primary);border-radius:14px;display:grid;place-items:center;color:white}.brand-mark .icon{width:26px;height:26px;stroke-width:2.3}.brand strong{display:block;font-size:23px;line-height:1.2;letter-spacing:3px;font-weight:650}.brand small{font-size:11px;color:var(--muted);letter-spacing:1px}.navigation{display:flex;flex-direction:column;gap:9px}.nav-link{display:flex;align-items:center;gap:13px;padding:12px 15px;border-radius:11px;color:#73788c;font-size:14px;min-height:49px}.nav-link.active{background:var(--blue);color:var(--primary);font-weight:600}.nav-link:hover{background:#f4f5fa}.nav-link.active:hover{background:#e7ebff}.nav-link small{margin-left:auto;border-radius:5px;font-size:11px;padding:0 5px;background:#dce2fd;color:var(--primary)}.sidebar-bottom{margin-top:auto}.pace-note{padding:25px 12px 29px;color:#9ba2ba}.pace-note>.icon{margin-bottom:12px;width:24px;height:24px}.pace-note p{font-size:12px;color:#66718a;line-height:1.85}.pace-note p span{color:#66718a}.settings-button{display:flex;align-items:center;gap:12px;padding:14px 13px;border-top:1px solid var(--line);width:100%;font-size:13px;color:var(--muted)}.settings-button:hover{color:var(--primary)}.local-note{font-size:10px;color:#66718a;padding:3px 13px}.workspace{margin-left:220px;min-height:100vh}.topbar{height:79px;border-bottom:1px solid var(--line);padding:0 45px;display:flex;align-items:center;justify-content:space-between;font-size:13px;color:var(--muted)}.accent-label{display:flex;align-items:center;gap:7px;color:#697187;font-size:12px}.accent-label .icon{width:15px;height:15px}main{max-width:1280px;margin:auto;padding:38px 45px 45px;outline:none}.page-heading{display:flex;align-items:center;justify-content:space-between;gap:25px;margin-bottom:29px}.page-heading p{font-size:13px;color:var(--muted);margin-top:10px}.quiet-tag{font-size:11px;color:#66718a;white-space:nowrap;display:flex;align-items:center;gap:7px}.quiet-tag:before{content:"";width:6px;height:6px;border-radius:50%;background:#94b9a0}.footer{max-width:1280px;margin:auto;padding:3px 45px 28px;display:flex;justify-content:space-between;gap:12px;font-size:11px;color:#66718a}.footer button{padding:0;color:#66718a;font-size:11px}.footer button:hover{color:var(--primary)}
.button{display:inline-flex;align-items:center;justify-content:center;gap:10px;border-radius:9px;min-height:43px;padding:10px 18px;font-size:13px;line-height:1.4;font-weight:500;white-space:nowrap;border:1px solid transparent}.button .icon{width:17px;height:17px}.button.primary{background:var(--primary);color:#fff}.button.primary:hover{background:var(--primary-dark)}.button.white{background:#fff;color:var(--primary)}.button.white:hover{background:#f0f2ff}.button.outline{border-color:#dce0ed;background:#fff;color:#535d7d}.button.outline:hover{border-color:#a8b4e7;background:#f6f8ff}.button.text-button{color:var(--muted);padding-left:0}.button.full-width{width:100%}.icon-button{display:inline-flex;align-items:center;justify-content:center;width:36px;height:36px;border-radius:9px;color:#66718a;flex-shrink:0}.icon-button:hover{background:#eef1fc;color:var(--primary)}.favorite-button.selected{color:var(--primary)}.favorite-button.selected svg{fill:#e0e6ff}.round-button{width:40px;height:40px;border-radius:50%;display:inline-flex;align-items:center;justify-content:center;background:var(--blue);color:var(--primary);flex-shrink:0}.round-button.small{width:34px;height:34px}.round-button.small svg{width:17px}.round-button:hover,.round-button.is-playing{background:#dce3ff}.section-heading{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-bottom:16px}.section-heading h2{font-size:17px}.section-heading a{display:flex;gap:7px;align-items:center;color:#66718a;font-size:11px}.section-heading a:hover{color:var(--primary)}.section-heading a .icon{width:14px;height:14px}.section-heading>span{color:#66718a;font-size:11px}.blue{background:var(--blue);color:#5b6ac7}.green{background:var(--green);color:#668773}.yellow{background:var(--yellow);color:#9c8745}
.sound-feature{background:#455bd0;color:#fff;min-height:304px;border-radius:var(--radius);padding:33px 38px;display:flex;align-items:center;justify-content:space-between;gap:25px;overflow:hidden}.feature-label{font-size:11px;color:#d2d9ff}.feature-copy h2{font-size:30px;font-weight:550;line-height:1.45;margin:10px 0 13px;letter-spacing:.2px}.feature-copy p{font-size:12px;line-height:1.9;color:#d3dbff}.feature-copy .button{margin-top:23px;font-size:12px;padding:10px 17px;min-height:39px}.sound-comparison{width:47%;max-width:390px;flex-shrink:0;text-align:center}.comparison-cards{display:flex;justify-content:center;gap:16px;align-items:center}.sound-tile{width:156px;min-height:190px;display:flex;flex-direction:column;align-items:center;background:#fff;color:var(--ink);border-radius:15px;box-shadow:0 12px 25px #293b9c25;position:relative;padding:14px 10px 15px}.sound-tile:nth-child(2){transform:translateY(11px);background:#f2f4ff}.sound-tile:hover{background:#e8ecff}.sound-tile.is-playing{box-shadow:0 0 0 3px #bfcaff,0 12px 25px #293b9c25}.big-ipa{font:54px/1.5 var(--ipa);color:var(--primary);letter-spacing:-2px}.sound-tile>strong{font:20px/1.2 var(--english);margin-bottom:15px}.tile-play{display:flex;gap:6px;align-items:center;color:#66718a;font-size:10px}.tile-play .icon{width:14px;height:14px}.comparison-note{display:block;margin-top:27px;color:#c8d2ff;font-size:10px}.home-columns{display:grid;grid-template-columns:minmax(0,1.65fr) minmax(230px,1fr);gap:28px;margin:32px 0}.course-list{background:var(--paper);border-radius:13px;border:1px solid var(--line);padding:0 19px}.course-row{display:flex;align-items:center;gap:14px;padding:21px 0;border-bottom:1px solid var(--line);min-width:0}.course-row:last-child{border-bottom:0}.course-row:hover .course-copy strong{color:var(--primary)}.course-symbol{width:49px;height:49px;border-radius:12px;display:grid;place-items:center;font:21px/1.2 var(--ipa);flex-shrink:0}.course-copy{min-width:0;flex:1}.course-copy strong{display:block;font-weight:550;font-size:14px}.course-copy small{display:block;color:#66718a;font-size:11px;margin-top:4px}.course-row>.icon{color:#9aa1b7;width:16px;height:16px}.course-meta{font-size:10px;color:#66718a;white-space:nowrap}.resume-panel{background:#eef0f9;border-radius:14px;padding:24px 25px;align-self:stretch;display:flex;flex-direction:column;align-items:flex-start}.resume-label{font-size:11px;color:#66718a;display:flex;align-items:center;gap:7px;margin-bottom:18px}.resume-label svg{width:15px;height:15px}.resume-panel h2{font-size:21px;line-height:1.7;font-weight:500}.resume-panel h2[lang=en]{font-family:var(--english);font-size:25px}.resume-panel p{font-size:12px;color:#66718a;line-height:1.9;margin:12px 0 22px}.resume-panel .button{margin-top:auto;font-size:12px;min-height:38px;padding:9px 16px}.scene-feature{display:flex;align-items:center;gap:26px;padding:24px 28px;background:#f6f0df;border:1px solid #eee7d4;border-radius:15px;min-height:155px}.scene-illustration{position:relative;flex-shrink:0;width:105px;padding:6px 15px 10px;background:#fffcf2;border:1px solid #e0d8bf;border-radius:13px 13px 13px 2px;transform:rotate(-4deg)}.scene-illustration>span{font:italic 23px/1.2 var(--english);color:#90805a}.scene-illustration i{position:absolute;bottom:-12px;right:-10px;background:#e4d4a4;border:3px solid #f6f0df;border-radius:50%;width:30px;height:30px;display:grid;place-items:center;color:#8d7a45}.scene-illustration i svg{width:15px;height:15px}.subtle-label{font-size:10px;color:#a18f63}.scene-feature h2{font-size:20px;margin-top:4px;font-weight:550}.scene-feature p{font-size:12px;color:#9a8e70;margin-top:7px}.scene-feature>.button{margin-left:auto;font-size:12px;background:#fffdf6;border-color:#ded7c4;color:#8c7f5c}.recent-section{margin-top:30px}.item-row{display:flex;align-items:center;gap:16px;padding:18px 18px;border-bottom:1px solid var(--line);background:#fff}.item-row:first-child{border-radius:12px 12px 0 0}.item-row:last-child{border-bottom:0;border-radius:0 0 12px 12px}.item-row:only-child{border-radius:12px}.item-copy{flex:1;min-width:0;display:flex;flex-direction:column}.item-copy strong{font:19px/1.55 var(--english);overflow-wrap:anywhere}.item-copy:hover strong{color:var(--primary)}.item-copy>span{font-size:12px;color:#66718a;margin-top:2px}.item-copy small{font-size:10px;color:#66718a;margin-top:5px}.level-label{font-size:10px;padding:3px 8px;background:#f3f4f8;color:#66718a;border-radius:5px;white-space:nowrap}.level-label.mastered{background:var(--green);color:#678975}.level-label.unsure{background:var(--yellow);color:#9f8a51}
.intro-strip{display:flex;gap:15px;background:var(--blue);padding:20px 23px;border-radius:12px;margin-bottom:32px}.intro-strip>.icon{color:var(--primary);margin-top:4px;width:24px;height:24px}.intro-strip strong{font-size:13px;font-weight:550}.intro-strip p{color:#66718a;font-size:12px;margin-top:4px}.chart-section{margin-top:34px}.filter-tabs{display:flex;gap:8px;align-items:center;flex-wrap:wrap;margin-bottom:25px}.chip{display:inline-flex;align-items:center;gap:8px;border-radius:8px;padding:8px 16px;font-size:12px;color:#81889d;background:#edeff5;min-height:36px}.chip.active{background:var(--primary);color:#fff}.chip:hover:not(.active){background:#e3e7f5;color:var(--primary)}.chip small{font-size:10px;padding:0 5px;border-radius:4px;background:#ffffff25}.chart-group{background:#fff;padding:22px;border:1px solid var(--line);border-radius:14px;margin-bottom:18px}.chart-heading{display:flex;align-items:baseline;gap:16px;margin-bottom:20px}.chart-heading h3{font-size:15px}.chart-heading p{font-size:11px;color:#66718a}.sound-grid{display:grid;grid-template-columns:repeat(8,minmax(0,1fr));gap:10px}.sound-key{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:91px;background:#f7f8fc;border:1px solid #edf0f7;border-radius:9px;padding:10px 4px}.sound-key:hover{background:var(--blue);border-color:#ccd4fb}.sound-key strong{font:28px/1.5 var(--ipa);color:#505e96}.sound-key span{color:#66718a;font:12px/1.5 var(--english);margin-top:4px}.help-text{font-size:11px;color:#66718a;line-height:1.9;margin-top:17px}.search-box{display:flex;align-items:center;gap:12px;max-width:600px;border:1px solid #dfe3ef;border-radius:10px;padding:12px 17px;background:#fff;margin:0 0 23px;color:#66718a}.search-box:focus-within{outline:2px solid #bcc8fa;border-color:#98a9f0}.search-box input{width:100%;padding:0;border:0;outline:0;background:transparent;font-size:13px;color:var(--ink);line-height:1.8}.search-box input:focus-visible{outline:0}.search-box input::placeholder{color:#66718a}.scene-tabs .chip{padding:7px 13px;font-size:11px}.scene-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}.scene-card{background:#fff;border:1px solid var(--line);border-radius:14px;padding:23px;position:relative;display:flex;flex-direction:column;align-items:flex-start;min-width:0}.scene-card:hover{border-color:#c2cbf0}.scene-icon{width:38px;height:38px;border-radius:10px;display:grid;place-items:center;margin-bottom:20px}.scene-card-count{position:absolute;right:22px;top:29px;font-size:10px;color:#66718a}.scene-card h2{font-size:16px;font-weight:550}.scene-card>p{font-size:11px;color:#66718a;margin-top:5px}.scene-sample{font:18px/1.6 var(--english);padding:18px 0 23px;min-height:100px;color:#596586}.scene-card-bottom{display:flex;align-items:center;justify-content:space-between;width:100%;border-top:1px solid var(--line);padding-top:15px;margin-top:auto;color:#66718a;font-size:10px}.scene-card-bottom .icon{width:16px;height:16px;color:#7f8bb4}.result-count{font-size:12px;color:#66718a;margin-bottom:14px}.result-list{border:1px solid var(--line);border-radius:13px;overflow:hidden}.empty-state{text-align:center;padding:70px 25px;background:#fff;border:1px solid var(--line);border-radius:14px}.empty-state>.icon{width:35px;height:35px;margin-bottom:20px;color:#b0b9d4}.empty-state h2{font-size:18px;font-weight:500}.empty-state p{color:#66718a;font-size:13px;margin:10px auto 22px;max-width:440px}.study-summary{display:flex;gap:50px;margin:12px 0 35px;padding:25px 30px;background:#fff;border:1px solid var(--line);border-radius:14px}.study-summary>div{display:flex;align-items:center;gap:13px}.study-summary strong{font:34px/1.4 var(--english);color:#5666b3}.study-summary span{font-size:12px;color:#66718a}.review-explanation{font-size:12px;color:#66718a;margin-bottom:20px}
.practice-heading{display:flex;justify-content:space-between;gap:16px;align-items:center;margin-bottom:25px}.practice-heading>span{font-size:12px;color:#66718a}.back-link{display:flex;align-items:center;gap:8px;font-size:12px;color:#8992ab}.back-link:hover{color:var(--primary)}.back-link svg{width:16px;height:16px}.practice-layout{display:grid;grid-template-columns:minmax(0,1fr) 255px;gap:30px}.practice-main{min-width:0}.practice-unit-label{display:flex;align-items:center;gap:8px;font-size:11px;color:#66718a}.unit-dot{width:7px;height:7px;border-radius:50%;background:#a4b0e6}.unit-dot.green{background:#8db49a}.unit-dot.yellow{background:#d2ba6a}.practice-title{font-size:25px;font-weight:550;margin:7px 0 23px}.practice-stage{background:#fff;border:1px solid var(--line);border-radius:18px;padding:17px 25px 18px;text-align:center}.stage-heading{display:flex;align-items:center;justify-content:space-between;color:#66718a;font-size:11px}.stage-heading>span{display:flex;align-items:center;gap:6px}.stage-heading>span svg{width:15px;height:15px}.sentence-display{min-height:159px;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:20px 0 14px;gap:10px}.english-sentence{font:32px/1.5 var(--english);overflow-wrap:anywhere;color:#2d3659}.chinese-sentence{font-size:14px;color:#66718a}.text-conceal{font-size:13px;color:#66718a;display:flex;align-items:center;justify-content:center;gap:9px;min-height:48px;padding:12px 20px;border-radius:8px;border:1px dashed #dce1ee;width:100%;background:#fbfcff}.text-conceal:hover{color:var(--primary);border-color:#b4c0ef}.text-conceal .icon{width:16px;height:16px}.text-toggles{display:flex;align-items:center;gap:13px;margin-top:8px}.text-toggles button{font-size:10px;color:#66718a;padding:3px}.text-toggles button:hover{color:var(--primary)}.text-toggles>span{height:9px;width:1px;background:#dfe3ef}.wave{color:#c6d0f5;width:200px;height:48px;display:block;margin:0 auto 20px}.practice-stage.playing .wave{color:#7e92e5}.practice-stage.playing .wave path:nth-child(3n){animation:pulse .8s ease-in-out infinite alternate;transform-origin:center}.player-controls{display:flex;align-items:center;justify-content:center;gap:10px;margin-bottom:25px}.play-main{min-width:132px;font-size:12px}.player-option{display:inline-flex;align-items:center;gap:6px;min-height:38px;border-radius:8px;padding:8px 11px;color:#66718a;background:#f5f7fc;font-size:10px;white-space:nowrap}.player-option .icon{width:14px;height:14px}.player-option:hover,.player-option.selected{background:var(--blue);color:var(--primary)}.seek-row{display:flex;align-items:center;gap:12px}.seek-row input{flex:1;width:100%;height:3px;accent-color:var(--primary);cursor:pointer}.seek-row span{font-size:9px;color:#66718a;white-space:nowrap;font-variant-numeric:tabular-nums}.pronunciation-tip{margin:14px 0 28px;background:#f0f2fa;border-radius:9px;color:#66718a;font-size:12px}.pronunciation-tip summary{cursor:pointer;padding:12px 15px;display:flex;align-items:center;gap:9px}.pronunciation-tip summary .icon{width:16px;height:16px}.pronunciation-tip summary:after{content:"＋";margin-left:auto;color:#8b97b8}.pronunciation-tip[open] summary:after{content:"−"}.pronunciation-tip p{padding:0 15px 15px;line-height:1.9}.recorder-section .section-heading{margin-bottom:12px}.recorder-section h2{font-size:15px}.record-box{border:1px dashed #d6ddeb;border-radius:12px;padding:19px 17px;display:flex;align-items:center;gap:14px;background:#fff}.record-button{width:40px;height:40px;border-radius:50%;background:#eef1fa;color:#8190bd;display:grid;place-items:center;flex-shrink:0}.record-button:hover{background:#dfe6fc;color:var(--primary)}.record-copy{flex:1;min-width:0}.record-copy strong{font-size:12px;font-weight:500;color:#687797}.record-copy p{font-size:10px;color:#66718a;margin-top:4px}.record-text-button{font-size:10px;min-height:32px;padding:7px 11px}.record-box.recording{border-color:#d48b8b;background:#fff8f8}.record-button.recording{background:#fde8e8;color:#b75353}.recording-playback{margin-top:12px;padding:8px 13px;border-radius:10px;background:#f0f3fa;display:flex;align-items:center;gap:10px}.recording-playback audio{width:100%;height:38px}.mastery-section{margin-top:27px}.mastery-section h2{font-size:13px;font-weight:500;margin-bottom:12px;color:#66718a}.mastery-options{display:flex;gap:9px}.mastery-button{display:inline-flex;align-items:center;justify-content:center;gap:7px;min-height:39px;padding:9px 16px;border:1px solid #e0e5f0;background:white;border-radius:8px;font-size:11px;color:#66718a;flex:1;white-space:nowrap}.mastery-button .icon{width:14px;height:14px}.mastery-button:hover,.mastery-button.selected{color:var(--primary);background:var(--blue);border-color:#c0cbf3}.mastery-dot{width:7px;height:7px;border:1.5px solid #c2b884;border-radius:50%}.mastery-dot.familiar{border-color:#91aaa3;background:#c9ded5}.practice-bottom{display:flex;align-items:center;justify-content:space-between;gap:10px;border-top:1px solid var(--line);margin-top:28px;padding-top:20px}.practice-bottom .button{font-size:11px;min-height:38px;padding:9px 13px}.practice-bottom>span{font-size:9px;color:#66718a}.lesson-outline{align-self:start;background:#fff;border:1px solid var(--line);border-radius:13px;padding:22px 16px;position:sticky;top:25px}.outline-heading{padding:0 8px 18px;border-bottom:1px solid var(--line);margin-bottom:10px}.outline-heading>span{display:block;color:#66718a;font-size:10px}.outline-heading strong{display:block;font-size:14px;font-weight:550;margin:5px 0 9px}.outline-heading p{color:#66718a;font-size:11px;line-height:1.9}.outline-item{display:flex;gap:10px;align-items:flex-start;padding:12px 8px;margin:3px 0;border-radius:8px;color:#66718a;font:14px/1.6 var(--english);min-width:0}.outline-item.active{background:var(--blue);color:var(--primary)}.outline-item:hover{background:#f3f5fc}.outline-item>span:last-child{overflow-wrap:anywhere}.outline-number{width:20px;height:20px;border-radius:50%;background:#f0f2f8;color:#66718a;display:flex;align-items:center;justify-content:center;flex-shrink:0;font:10px/1 var(--sans);margin-top:1px}.outline-number svg{width:12px;height:12px}.outline-item.active .outline-number{background:#d9e0ff;color:var(--primary)}.quiz-entry{margin-top:16px;display:flex;align-items:center;gap:7px;width:100%;padding:12px 8px;border-top:1px solid var(--line);font-size:10px;color:#7b8bc0}.quiz-entry .icon{width:15px;height:15px}.quiz-entry .icon:last-child{margin-left:auto}.outline-note{font-size:10px;line-height:1.9;color:#66718a;padding:14px 8px 0}
dialog{border:1px solid #e4e8f4;border-radius:20px;padding:28px;width:min(490px,calc(100vw - 32px));max-height:85dvh;color:var(--ink);box-shadow:0 25px 100px #172a5933;overflow:auto}dialog::backdrop{background:#24325d55;backdrop-filter:blur(3px)}.modal-heading{display:flex;justify-content:space-between;align-items:center;gap:15px;margin-bottom:15px}.modal-heading h2{font-size:20px}.modal-heading .icon-button{margin-right:-5px}.modal-intro{font-size:13px;color:#66718a;margin-bottom:21px}dialog>p{font-size:13px;color:#7f8aa3;margin-bottom:15px}.sound-detail{text-align:center;padding:5px 0 23px}.detail-ipa{font:80px/1.5 var(--ipa);color:var(--primary);margin-bottom:9px}.detail-word{font:22px/1.6 var(--english);margin-top:15px}.detail-word span{font:16px/1.6 var(--ipa);color:#66718a;margin-left:10px}.tip-box{padding:18px 20px;background:var(--blue);border-radius:11px}.tip-box strong{font-size:12px;color:#6475b6;font-weight:550}.tip-box p{font-size:13px;line-height:1.9;color:#7684ac;margin-top:7px}.sound-detail~.full-width{margin-top:20px}.quiz-audio{text-align:center;padding:10px 0 24px}.quiz-audio .wave{margin-bottom:16px}.quiz-options{display:flex;gap:15px}.quiz-option{flex:1;border:1px solid #dfe4f1;padding:18px;border-radius:10px;font:25px/1.5 var(--english)}.quiz-option:hover{border-color:#b5c1f2;background:var(--blue)}.quiz-option.correct{background:var(--green);border-color:#99bca3;color:#52856a;opacity:1}.quiz-option.incorrect{background:#fff0ef;border-color:#e6b4ad;color:#ad6c63;opacity:1}.quiz-feedback:not(:empty){margin-top:20px;background:#f5f7fc;border-radius:12px;padding:18px}.quiz-feedback strong{font-size:14px;font-weight:550}.quiz-feedback p{font-size:12px;color:#8995ad;margin:8px 0 17px;line-height:1.9}.preference-row{display:flex;align-items:center;justify-content:space-between;gap:20px;border-bottom:1px solid var(--line);padding:18px 0}.preference-row strong{display:block;font-size:13px;font-weight:500}.preference-row small{display:block;color:#66718a;font-size:11px;margin-top:5px}.preference-row input{width:19px;height:19px;accent-color:var(--primary);flex-shrink:0}.settings-data{padding-top:25px}.settings-data h3{font-size:14px}.settings-data p{font-size:12px;color:#66718a;line-height:1.9;margin:10px 0 20px}.backup-actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:22px}.about-copy h3{font-size:14px;margin:22px 0 10px}.about-copy p{font-size:13px;color:#66718a;line-height:1.9}.toast{position:fixed;bottom:30px;left:calc(50% + 110px);transform:translate(-50%,15px);padding:12px 20px;background:#303b5d;color:#fff;box-shadow:0 5px 25px #25335b20;border-radius:10px;max-width:calc(100vw - 40px);width:max-content;font-size:12px;pointer-events:none;opacity:0;transition:opacity .15s,transform .15s;z-index:100}.toast.visible{opacity:1;transform:translate(-50%,0)}.storage-warning{padding:11px 30px;background:#fff0d7;color:#967132;font-size:12px;text-align:center}
@keyframes pulse{from{opacity:.4}to{opacity:1}}
@media(min-width:1450px){main{padding-top:45px}.sound-feature{padding:39px 45px;min-height:330px}.sound-tile{width:170px;min-height:205px}.big-ipa{font-size:61px}.feature-copy h2{font-size:34px}.home-columns{gap:35px}.course-row{padding:25px 0}.resume-panel{padding:28px 30px}}
@media(max-width:1180px){.sidebar{width:192px;padding:30px 16px 20px}.brand{margin:0 7px 40px}.nav-link{padding:12px 13px}.workspace{margin-left:192px}.topbar{padding:0 30px}main{padding:30px}.footer{padding-left:30px;padding-right:30px}.toast{left:calc(50% + 96px)}.sound-feature{padding:30px;gap:15px}.feature-copy h2{font-size:27px}.sound-tile{width:130px;min-height:170px}.big-ipa{font-size:46px}.comparison-cards{gap:12px}.comparison-note{font-size:9px}.home-columns{grid-template-columns:minmax(0,1.5fr) minmax(220px,1fr);gap:20px}.course-list{padding:0 15px}.course-row{gap:11px}.course-meta{display:none}.course-copy small{font-size:10px}.scene-feature{gap:21px;padding:22px}.scene-feature>.button{padding:9px 12px;font-size:11px}.scene-feature h2{font-size:18px}.scene-feature p{font-size:11px}.scene-illustration{width:89px}.scene-grid{gap:15px}.scene-card{padding:20px}.scene-card-count{right:18px}.scene-card h2{font-size:14px}.scene-sample{font-size:17px}.practice-layout{grid-template-columns:minmax(0,1fr) 220px;gap:21px}.practice-stage{padding:14px 19px}.player-controls{gap:7px}.player-option{padding:8px}.record-text-button{display:none}.record-copy p{font-size:9px}.sound-grid{grid-template-columns:repeat(7,minmax(0,1fr))}.study-summary{gap:28px}.study-summary>div{gap:9px}}
@media(max-width:950px){.sidebar{width:175px;padding-left:12px;padding-right:12px}.brand{gap:10px}.brand strong{font-size:21px}.brand-mark{width:37px;height:37px}.brand small{font-size:10px}.workspace{margin-left:175px}.topbar{height:67px;padding:0 25px}main{padding:29px 25px}.footer{padding-left:25px;padding-right:25px}.nav-link{font-size:12px;gap:10px}.nav-link .icon{width:18px;height:18px}.page-heading h1{font-size:25px}.quiet-tag{display:none}.sound-feature{padding:27px 24px}.sound-comparison{width:45%}.comparison-cards{gap:10px}.sound-tile{width:112px;min-height:150px}.big-ipa{font-size:40px}.sound-tile>strong{font-size:18px;margin-bottom:12px}.feature-copy h2{font-size:23px}.feature-copy p{font-size:11px}.feature-copy .button{font-size:11px}.home-columns{grid-template-columns:1fr}.resume-panel{display:grid;grid-template-columns:1fr auto;column-gap:20px;align-items:center;padding:24px}.resume-label{grid-column:1/-1;margin-bottom:11px}.resume-panel h2{font-size:19px}.resume-panel h2 br{display:none}.resume-panel p{margin:7px 0 0;grid-column:1}.resume-panel p br{display:none}.resume-panel .button{grid-column:2;grid-row:2/4;margin:0}.course-meta{display:block}.scene-feature{flex-wrap:wrap;gap:22px}.scene-feature>.button{margin:0 0 0 auto}.scene-illustration{width:90px}.scene-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.sound-grid{grid-template-columns:repeat(6,minmax(0,1fr))}.chart-heading{align-items:flex-start;flex-direction:column;gap:3px}.practice-layout{grid-template-columns:1fr}.lesson-outline{position:static}.lesson-outline nav{display:grid;grid-template-columns:1fr 1fr;gap:0 15px}.outline-note{display:none}.outline-heading p{max-width:100%;font-size:12px}.outline-heading{padding-bottom:15px}.quiz-entry{font-size:12px}.toast{left:calc(50% + 87.5px)}.study-summary{gap:18px;justify-content:space-between;padding:22px}.study-summary>div{flex-direction:column;align-items:flex-start;gap:2px}.study-summary span{font-size:10px}.study-summary strong{font-size:30px}.page-heading>.button{font-size:11px;padding:10px 12px}.section-heading>span{font-size:10px}.home-heading{margin-bottom:23px}}
@media(max-width:700px){.sidebar{inset:auto 0 0;width:100%;height:72px;padding:0;border:0;border-top:1px solid #e5e9f4;background:#fffffff5;backdrop-filter:blur(10px);padding-bottom:env(safe-area-inset-bottom);box-sizing:content-box}.brand,.sidebar-bottom{display:none}.navigation{flex-direction:row;justify-content:space-around;gap:0;height:100%;padding:6px 10px}.nav-link{flex:1;flex-direction:column;align-items:center;justify-content:center;gap:4px;padding:6px 3px;font-size:10px;border-radius:9px;position:relative;min-height:0}.nav-link .icon{width:20px;height:20px}.nav-link small{position:absolute;top:3px;left:calc(50% + 10px);font-size:8px;margin:0}.nav-link.active{background:#f0f3ff}.workspace{margin-left:0;padding-bottom:calc(72px + env(safe-area-inset-bottom))}.topbar{height:60px;padding:0 22px;font-size:12px}.accent-label{font-size:10px}.accent-label svg{width:13px;height:13px}main{padding:26px 20px 30px}.page-heading{margin-bottom:22px;align-items:flex-start;gap:15px}.page-heading h1{font-size:25px;letter-spacing:-.7px}.page-heading p{font-size:12px;margin-top:8px}.home-heading h1{font-size:27px}.sound-feature{padding:25px;gap:30px;align-items:stretch;flex-direction:column;border-radius:17px}.feature-copy{position:relative}.feature-copy h2{font-size:27px;margin:8px 0 10px}.feature-copy h2 br{display:block}.feature-copy p{font-size:11px}.feature-copy .button{position:absolute;bottom:3px;right:0;font-size:10px;padding:10px 12px;gap:7px;min-height:37px}.feature-copy .button .icon{width:14px;height:14px}.sound-comparison{width:100%;max-width:none}.comparison-cards{gap:18px}.sound-tile{width:calc(50% - 9px);max-width:190px;min-height:147px;padding:9px 10px 12px}.sound-tile:nth-child(2){transform:translateY(0)}.big-ipa{font-size:43px}.sound-tile>strong{font-size:19px;margin-bottom:10px}.comparison-note{margin-top:17px;font-size:10px}.home-columns{margin:27px 0;gap:22px}.section-heading{margin-bottom:13px}.section-heading h2{font-size:16px}.section-heading a{font-size:10px}.course-row{padding:19px 0}.course-copy strong{font-size:13px}.course-copy small{font-size:10px}.course-symbol{width:43px;height:43px;font-size:20px}.course-meta{font-size:9px}.course-row>.icon{width:14px;height:14px}.resume-panel{padding:21px}.resume-panel h2{font-size:17px}.resume-panel h2[lang=en]{font-size:22px}.resume-panel p{font-size:11px}.resume-panel .button{font-size:10px;padding:9px 12px;min-height:35px}.resume-label{font-size:10px}.scene-feature{gap:19px;padding:22px;position:relative}.scene-illustration{width:74px;min-height:65px;padding:7px 10px}.scene-illustration>span{font-size:19px}.scene-feature>div:nth-child(2){flex:1}.scene-feature h2{font-size:17px}.scene-feature p{font-size:10px}.scene-feature>.button{margin:0 0 0 94px;font-size:10px;padding:8px 13px;min-height:33px}.subtle-label{font-size:9px}.footer{font-size:9px;padding:0 20px 23px;gap:20px;align-items:center}.footer button{font-size:9px}.recent-section{margin-top:27px}.item-row{gap:11px;padding:17px 12px}.item-copy strong{font-size:18px}.item-copy>span{font-size:11px}.item-copy small{font-size:9px}.item-row .level-label{display:none}.item-row .icon-button{width:30px}.item-row .round-button{width:30px;height:30px}.item-row .round-button svg{width:15px}.intro-strip{padding:18px;gap:12px;margin-bottom:26px}.intro-strip strong{font-size:12px}.intro-strip p{font-size:11px}.intro-strip>.icon{width:21px;height:21px}.section-heading>span{font-size:9px}.chart-section{margin-top:28px}.chart-section>.section-heading{align-items:flex-start;flex-direction:column;gap:4px}.chip{font-size:11px;padding:7px 14px;min-height:34px}.filter-tabs{gap:7px;margin-bottom:20px}.chart-group{padding:17px 13px}.chart-heading{padding:0 3px;margin-bottom:15px}.chart-heading p{font-size:10px}.sound-grid{grid-template-columns:repeat(5,minmax(0,1fr));gap:7px}.sound-key{min-height:78px;padding:8px 3px}.sound-key strong{font-size:25px}.sound-key span{font-size:10px}.help-text{font-size:10px}.search-box{padding:11px 14px;margin-bottom:19px}.search-box input{font-size:12px}.scene-tabs{gap:6px}.scene-tabs .chip{font-size:10px;padding:6px 11px;min-height:31px}.scene-grid{gap:13px}.scene-card{padding:17px 15px;border-radius:12px}.scene-card h2{font-size:14px}.scene-card>p{font-size:10px}.scene-icon{width:33px;height:33px;border-radius:9px;margin-bottom:16px}.scene-icon svg{width:18px;height:18px}.scene-card-count{font-size:8px;right:13px;top:25px}.scene-sample{font-size:17px;min-height:106px;padding:16px 0 20px;overflow-wrap:anywhere}.scene-card-bottom{font-size:9px}.scene-card-bottom svg{width:14px;height:14px}.study-summary{margin:7px 0 24px;padding:19px;gap:15px}.study-summary strong{font-size:28px}.study-summary span{font-size:10px}.page-heading>.button{font-size:0;padding:9px;min-height:36px;gap:0}.page-heading>.button .icon{width:17px;height:17px}.review-explanation{font-size:11px}.practice-heading{margin-bottom:22px}.practice-heading>span,.back-link{font-size:11px}.practice-unit-label{font-size:10px}.practice-title{font-size:24px;margin:7px 0 20px}.practice-stage{padding:14px 18px 17px;border-radius:15px}.english-sentence{font-size:31px}.sentence-display{min-height:164px;padding:18px 0}.chinese-sentence{font-size:13px}.text-conceal{font-size:11px;padding:13px 8px;gap:7px}.text-conceal svg{width:14px;height:14px}.text-toggles button{font-size:10px}.wave{width:190px;height:42px;margin-bottom:19px}.player-controls{gap:8px;margin-bottom:23px}.play-main{font-size:11px;min-width:121px;min-height:41px;padding:10px 14px}.player-option{font-size:10px;padding:8px;gap:5px}.player-option svg{width:13px;height:13px}.seek-row{gap:10px}.seek-row span{font-size:8px}.pronunciation-tip{font-size:11px;margin-bottom:24px}.recorder-section h2{font-size:14px}.record-box{padding:17px 14px;gap:12px}.record-copy strong{font-size:11px}.record-copy p{font-size:9px}.record-button{width:38px;height:38px}.mastery-section{margin-top:24px}.mastery-options{gap:7px}.mastery-button{padding:9px 10px;font-size:10px;gap:6px}.practice-bottom{padding-top:18px;margin-top:24px;gap:6px}.practice-bottom>span{font-size:8px}.practice-bottom .button{font-size:10px;padding:9px 10px;gap:6px}.practice-bottom .button svg{width:14px;height:14px}.lesson-outline{padding:19px 13px}.outline-item{font-size:13px}.outline-heading strong{font-size:13px}.outline-heading p{font-size:11px}.toast{left:50%;bottom:calc(90px + env(safe-area-inset-bottom));font-size:11px;max-width:calc(100vw - 32px);padding:11px 16px}.storage-warning{font-size:10px;padding:10px 20px}dialog{padding:23px;border-radius:16px}.modal-heading h2{font-size:19px}.modal-intro{font-size:12px}.detail-ipa{font-size:70px}.tip-box p{font-size:12px}.preference-row strong{font-size:12px}.preference-row small{font-size:10px}.backup-actions .button{font-size:12px}}
@media(max-width:365px){main{padding-left:15px;padding-right:15px}.sound-feature{padding:21px}.feature-copy .button{position:static;margin-top:18px}.feature-copy h2{font-size:24px}.scene-feature h2{font-size:15px}.scene-feature p{font-size:9px}.course-meta{display:none}.sound-grid{grid-template-columns:repeat(4,minmax(0,1fr))}.scene-grid{grid-template-columns:1fr}.scene-sample{min-height:0}.practice-bottom>span{display:none}.player-controls{gap:5px}.player-option{font-size:9px;padding:7px}.play-main{min-width:115px;font-size:10px}.mastery-button{padding:9px 6px}.study-summary{gap:10px;padding:16px}.study-summary span{font-size:9px}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{scroll-behavior:auto!important;animation:none!important;transition:none!important}}