:root{font-family:Inter,Microsoft YaHei,PingFang SC,system-ui,sans-serif;color:#173633;background:#f3f8f6;font-synthesis:none;text-rendering:optimizeLegibility}*{box-sizing:border-box}body{margin:0;min-width:320px}button,input,textarea{font:inherit}button{cursor:pointer}button:disabled{cursor:not-allowed;opacity:.48}a{color:inherit;text-decoration:none}button:focus-visible,input:focus-visible,textarea:focus-visible{outline:3px solid rgba(22,99,91,.22);outline-offset:2px}.app-shell{min-height:100vh;padding:22px;background:radial-gradient(circle at 12% 8%,rgba(28,120,106,.12),transparent 28%),linear-gradient(135deg,#f4faf7,#eef6f3 48%,#f7f5ef)}.top-nav,.song-header,.player-bar,.page-heading{display:flex;align-items:center;justify-content:space-between;gap:16px}.top-nav{max-width:1380px;margin:0 auto 18px}.brand{font-size:24px;font-weight:800;color:#123b36}.tagline,.muted{color:#657b76;line-height:1.55}.tagline{margin-top:4px;font-size:14px}.nav-actions,.segmented,.mini-tabs,.song-tags,.stats,.phrase-row,.upload-grid{display:flex;align-items:center;gap:8px;flex-wrap:wrap}.nav-button,.nav-link-button,.secondary,.link-secondary,.upload-grid button,.mini-tabs button,.segmented button,.review-line button{border:0;border-radius:8px;color:#38534e;background:#eaf2ef;display:inline-flex;align-items:center;gap:7px;min-height:38px;padding:0 14px;font-size:14px;font-weight:700}.nav-button.active,.segmented .selected,.mini-tabs .active,.primary,.play-button{border:0;color:#fff;background:#16635b}.publish-actions{display:flex;align-items:center;gap:10px;flex-wrap:wrap}.link-secondary{justify-content:center}.primary,.play-button{border-radius:8px;min-height:42px;padding:0 18px;display:inline-flex;align-items:center;justify-content:center;gap:8px;font-weight:800}.wide{width:100%}.panel{background:#ffffffe6;border:1px solid #dce8e3;border-radius:8px;box-shadow:0 18px 50px #194c4414}.section-title{color:#123b36;font-size:26px;font-weight:850}.section-title.small{font-size:18px}.import-grid{max-width:1120px;margin:0 auto;display:grid;grid-template-columns:minmax(320px,.95fr) minmax(320px,1.05fr);gap:18px}.imported-panel{grid-column:1 / -1}.import-form,.import-grid>.panel,.review-layout{padding:28px}.field{display:grid;gap:8px;margin-top:20px;color:#526762;font-size:13px;font-weight:800}.field input{height:48px;border:1px solid #cfe0da;border-radius:8px;padding:0 14px;color:#173633;background:#fff}.field.compact{margin-top:0}.field textarea{min-height:124px;resize:vertical;border:1px solid #cfe0da;border-radius:8px;padding:12px 14px;color:#173633;background:#fff;line-height:1.5}.checks{display:grid;gap:12px;margin:22px 0}.checks span{display:flex;align-items:center;gap:8px;font-weight:700}.checks svg{color:#16635b}.import-alert{display:grid;gap:7px;margin:0 0 14px;border:1px solid #f1d6a9;border-radius:8px;padding:12px;color:#725012;background:#fff8eb;line-height:1.45}.import-alert strong{color:#7b4d00}.import-alert span{font-size:14px}.alert-actions{display:flex;flex-wrap:wrap;gap:8px;margin-top:4px}.alert-actions .primary,.alert-actions .secondary{min-height:36px;padding:0 12px;font-size:13px}.upload-grid{margin:20px 0 22px}.upload-grid button{flex:1 1 150px;justify-content:center;height:74px;flex-direction:column}.upload-grid button.selected-material{color:#fff;background:#16635b}.material-editor{margin:16px 0 18px}.material-card{display:grid;gap:12px}.material-save{justify-self:end}.file-drop{min-height:124px;border:1px dashed #9dbbb4;border-radius:8px;display:grid;place-items:center;gap:8px;padding:18px;color:#526762;background:#f8fbfa;text-align:center;font-weight:750}.file-drop input{max-width:250px}.form-error,.upload-success{margin:0;line-height:1.45;font-size:13px;font-weight:750}.form-error{color:#9b2f2f}.upload-success{color:#16635b;overflow-wrap:anywhere}.upload-success a{text-decoration:underline;text-underline-offset:3px}.material-status{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:20px}.material-status span{display:inline-flex;align-items:center;gap:5px;border-radius:999px;padding:7px 10px;color:#647a75;background:#eef4f1;font-size:12px;font-weight:800}.material-status .done{color:#16635b;background:#dff1ec}.preview-card{border-top:1px solid #dce8e3;padding-top:22px}.imported-head{display:flex;align-items:flex-start;justify-content:space-between;gap:14px;margin-bottom:16px}.imported-head .muted{margin:6px 0 0}.imported-actions{display:flex;align-items:center;justify-content:flex-end;gap:8px;flex-wrap:wrap}.import-count{min-width:36px;height:36px;display:grid;place-items:center;border-radius:50%;color:#16635b;background:#dff1ec;font-weight:850}.imported-list{display:grid;gap:10px}.imported-song{display:grid;grid-template-columns:auto minmax(180px,1fr) minmax(320px,1.8fr) auto;align-items:center;gap:14px;border:1px solid #dce8e3;border-radius:8px;padding:14px;background:#fbfdfc}.imported-song.selected{border-color:#7fb5aa;background:#f0faf6}.import-select{width:28px;height:28px;display:grid;place-items:center}.import-select input{width:18px;height:18px;accent-color:#16635b}.imported-song div:nth-child(2){display:grid;gap:4px}.imported-song strong{color:#123b36;font-size:17px}.imported-song span,.imported-song time{color:#657b76}.imported-song time{white-space:nowrap;font-size:13px;font-weight:800}.imported-status{display:flex;align-items:center;gap:8px;flex-wrap:wrap}.danger-button{border:0;border-radius:8px;min-height:38px;padding:0 14px;display:inline-flex;align-items:center;justify-content:center;gap:7px;color:#fff;background:#a83232;font-size:14px;font-weight:800}.status-pill{display:inline-flex;align-items:center;min-height:30px;border-radius:999px;padding:0 10px;font-size:12px;font-weight:850;white-space:nowrap}.status-pill.done{color:#16635b;background:#dff1ec}.status-pill.pending{color:#8a5b08;background:#fff1d8}.status-pill.missing{color:#7c4a46;background:#ffe8e6}.empty-imports{min-height:84px;display:flex;align-items:center;justify-content:center;gap:10px;border:1px dashed #b8cdc7;border-radius:8px;color:#657b76;background:#f8fbfa;text-align:center;line-height:1.45}.level{display:inline-flex;align-items:center;border-radius:999px;padding:5px 10px;font-size:12px;font-style:normal;font-weight:850;white-space:nowrap}.level.high{color:#a83232;background:#ffe8e6}.level.middle{color:#a15b09;background:#fff0dc}.level.low{color:#2264a8;background:#e5f0ff}.review-layout,.learning-shell{max-width:1380px;margin:0 auto}.review-grid,.learning-grid{display:grid;grid-template-columns:minmax(0,1.6fr) minmax(320px,.8fr);gap:18px;margin-top:18px}.review-grid .panel,.lyrics-panel,.word-panel{padding:22px}.review-line{position:relative;display:grid;gap:8px;padding:16px 92px 16px 16px;border-bottom:1px solid #e3eee9}.review-line time{color:#16635b;font-size:13px;font-weight:850}.review-line strong{color:#263c38}.review-line span,.word-review p,.word-review small{color:#647a75}.review-line button{position:absolute;top:16px;right:12px}.review-editor,.word-review-editor{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.review-editor label,.word-review-editor label{display:grid;gap:6px;color:#526762;font-size:12px;font-weight:800}.review-editor .full,.word-review-editor .full{grid-column:1 / -1}.review-editor input,.word-review-editor input,.word-review-editor select{width:100%;min-width:0;height:40px;border:1px solid #cfe0da;border-radius:8px;padding:0 10px;color:#173633;background:#fff}.review-save{justify-self:end;grid-column:1 / -1}.word-review{position:relative;padding:16px 0;border-bottom:1px solid #e3eee9}.word-review div{display:flex;align-items:center;justify-content:space-between;gap:10px}.word-edit-button{margin-top:12px;border:0;border-radius:8px;min-height:34px;padding:0 12px;color:#38534e;background:#eaf2ef;font-size:13px;font-weight:800}.song-header{padding:20px 24px;margin-bottom:16px;border-radius:12px;background:#ffffffb8;border:1px solid #dce8e3}.song-header h1{margin:0;color:#123b36;font-size:32px}.song-header p{margin:6px 0 0;color:#5d746f}.song-tools{display:grid;justify-items:end;gap:10px}.song-picker{display:flex;align-items:center;gap:8px;color:#526762;font-size:13px;font-weight:850}.song-picker select{min-width:220px;height:38px;border:1px solid #cfe0da;border-radius:8px;padding:0 10px;color:#173633;background:#fff;font-weight:700}.empty-learning{width:min(560px,100%);margin:12vh auto 0;padding:36px;text-align:center}.empty-icon{width:58px;height:58px;display:grid;place-items:center;margin:0 auto 16px;border-radius:50%;color:#16635b;background:#dff1ec}.empty-learning h1{margin:0;color:#123b36;font-size:28px}.empty-learning p{margin:12px auto 0;max-width:430px;color:#657b76;line-height:1.65}.learning-grid{grid-template-columns:minmax(0,1.8fr) minmax(330px,.9fr)}.lyrics-panel,.word-panel{min-height:580px}.lyrics-scroll{height:510px;overflow:auto;padding-right:6px;scroll-behavior:smooth}.lyric-line{border-radius:8px;padding:18px 18px 16px;margin:12px 0;transition:background .18s ease,transform .18s ease}.lyric-line.active{background:#e7f4ef;transform:translate(3px)}.english{margin:0;color:#314641;font-size:24px;font-weight:650;line-height:1.55}.active .english{color:#106156;font-weight:850}.translation{margin:8px 0 0;color:#768984;font-size:16px}.word-token{position:relative;border:0;border-bottom:2px solid currentColor;background:transparent;color:inherit;padding:0 2px;font-weight:inherit}.word-token.high{color:#a83232}.word-token.middle{color:#a15b09}.word-token.low{color:#2264a8}.word-token sup{display:inline-flex;align-items:center;justify-content:center;min-width:16px;height:16px;margin-left:2px;border-radius:99px;color:#fff;background:#16635b;font-size:10px;vertical-align:super}.word-token.high sup{background:#a83232}.word-token.middle sup{background:#a15b09}.word-token.low sup{background:#2264a8}.word-panel-head{display:grid;gap:12px}.word-list{display:grid;gap:10px;margin-top:16px;max-height:492px;overflow:auto}.word-card{width:100%;display:grid;grid-template-columns:32px 1fr;gap:12px;text-align:left;border:1px solid #dce8e3;border-radius:8px;background:#fff;padding:14px}.word-index{width:28px;height:28px;display:grid;place-items:center;color:#fff;background:#16635b;border-radius:50%;font-weight:850}.word-card span:last-child{display:grid;gap:6px}.word-card strong{color:#173633}.word-card small{color:#657b76;line-height:1.35}.player-bar{margin-top:16px;padding:14px;border:1px solid #dce8e3;border-radius:12px;background:#fff}.icon-button{width:42px;height:42px;border:0;border-radius:8px;color:#38534e;background:#eaf2ef}.time{display:inline-flex;align-items:center;gap:5px;color:#526762;font-weight:800;white-space:nowrap}.range{flex:1;accent-color:#16635b}.drawer-backdrop{position:fixed;top:0;right:0;bottom:0;left:0;display:grid;place-items:center;padding:24px;background:#0e221f3d;z-index:20}.grammar-drawer{position:relative;width:min(540px,100%);max-height:calc(100vh - 48px);overflow:auto;border-radius:12px;padding:28px;background:#fff;box-shadow:0 28px 90px #10252233}.close{position:absolute;right:18px;top:18px;width:34px;height:34px;border:0;border-radius:8px;background:#eef4f1}.drawer-title{display:flex;align-items:center;gap:12px}.drawer-title h2{margin:0;color:#123b36;font-size:34px}.phonetic,.memory-tip{color:#647a75}.grammar-drawer dl{display:grid;gap:14px}.grammar-drawer dt{color:#16635b;font-weight:850}.grammar-drawer dd{margin:0;color:#304743;line-height:1.55;min-width:0;overflow-wrap:anywhere;word-break:break-word}.phrase-row span{border-radius:8px;padding:8px 10px;color:#7b6a44;background:#fff4df;font-weight:750}.mind-map{margin-top:16px;padding:22px}.map-tree{display:grid;justify-items:center;gap:22px}.map-root{padding:18px 42px;border-radius:8px;color:#fff;background:#16635b;font-size:22px;font-weight:850}.map-branches{width:100%;display:grid;grid-template-columns:repeat(3,1fr);gap:14px}.map-group{min-height:180px;display:grid;align-content:start;gap:10px;border-radius:8px;padding:16px;background:#f6faf8;border:1px solid #dce8e3}.map-group strong{color:#123b36;font-size:18px}.map-group button{border:0;border-radius:8px;padding:10px;text-align:left;color:#304743;background:#fff}@media (max-width: 860px){.app-shell{padding:14px}.top-nav,.song-header,.page-heading,.player-bar{align-items:stretch;flex-direction:column}.nav-actions{width:100%}.nav-button{flex:1;justify-content:center}.import-grid,.review-grid,.learning-grid,.map-branches{grid-template-columns:1fr}.import-form,.import-grid>.panel,.review-layout,.review-grid .panel,.lyrics-panel,.word-panel{padding:18px}.song-header h1{font-size:26px}.song-tools{justify-items:stretch}.song-picker{align-items:stretch;flex-direction:column}.song-picker select{width:100%;min-width:0}.lyrics-panel,.word-panel{min-height:auto}.lyrics-scroll{height:430px}.english{font-size:19px}.translation{font-size:14px}.word-list{max-height:320px}.player-bar{position:sticky;bottom:10px;z-index:10}.range{width:100%}.imported-head,.imported-song{align-items:stretch;grid-template-columns:1fr}.imported-head{flex-direction:column}.import-count{align-self:flex-start}.imported-actions{justify-content:flex-start}.grammar-drawer{align-self:end;border-bottom-right-radius:0;border-bottom-left-radius:0}.grammar-drawer dl{grid-template-columns:1fr;gap:6px}}