:root{--paper:#f7f8f2;--white:#fff;--ink:#263e34;--muted:#777e73;--green:#285645;--line:#e6e9de;--soft:#edf0e6;--gold:#a38146;--radius:20px;--phone:440px;color-scheme:light;font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;color:var(--ink);font-size:15px;line-height:1.6;background:#e7ece6;font-synthesis:none}*{box-sizing:border-box}body{margin:0}button,input,select,textarea{font:inherit}button,a,input,select,textarea{-webkit-tap-highlight-color:transparent}button{cursor:pointer;color:inherit;border:0;background:none}button:disabled{opacity:.42;cursor:not-allowed}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible{outline:3px solid #a48347;outline-offset:3px}a{color:inherit;text-decoration:none}svg{display:block}button 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h2{font-size:18px}.sheet-option{display:flex;justify-content:space-between;align-items:center;width:100%;text-align:left;min-height:51px;border-bottom:1px solid var(--line);font-size:14px}.sheet-option.active{color:var(--green);font-weight:650}.sheet-option .icon{width:18px;height:18px}.sheet-option small{display:block;font-size:11px;color:var(--muted);font-weight:400}.sheet-option.tall{padding:12px 0}.sheet-inner .notice{margin-bottom:0}.sheet-inner .lesson:first-of-type{padding-top:8px}#toast{position:fixed;bottom:calc(162px + env(safe-area-inset-bottom));left:50%;transform:translate(-50%,10px);width:max-content;max-width:min(85vw,375px);z-index:100;background:#263b32ed;border:1px solid #ffffff25;color:#fff8e7;padding:12px 17px;border-radius:12px;font-size:12px;line-height:1.7;box-shadow:0 5px 25px #0001;pointer-events:none;opacity:0;transition:opacity .2s,transform .2s}#toast.visible{opacity:1;transform:translate(-50%,0)}.boot{text-align:center;padding:35vh 0}.boot h1{font-family:serif;font-size:40px;letter-spacing:7px}.boot p{font-size:12px;color:var(--muted);margin-top:17px}.desktop-intro,.desktop-note{display:none}.storage-warning{font-size:11px;background:#f5e9d8;padding:9px 14px;border-radius:9px;color:#906a43}.no-dock #view{padding-bottom:115px}.player-page #view{padding-bottom:35px}.muted-link{font-size:11px;text-decoration:underline;text-underline-offset:3px;color:var(--muted)}[hidden]{display:none!important}@media(min-width:1020px){.desktop-intro{display:block;position:fixed;top:16vh;right:calc(50% + 280px);width:210px}.intro-brand{font-size:24px;letter-spacing:5px}.intro-brand span{display:block;font-size:9px;letter-spacing:3px;margin-top:4px;color:#768270}.intro-line{width:30px;height:1px;background:#a6b49c;margin:44px 0 25px}.desktop-intro h1{font-family:"Songti SC","STSong",serif;font-size:34px;line-height:1.8;font-weight:400;letter-spacing:2px}.desktop-intro p{font-size:12px;color:#74816b;line-height:2.3;margin-top:22px}.intro-foot{font-size:8px;color:#889580;letter-spacing:1.4px;margin-top:74px;line-height:2.8}.intro-foot span{font-size:10px;letter-spacing:1px}.desktop-note{display:block;position:fixed;top:41vh;left:calc(50% + 280px);width:230px}.desktop-note .eyebrow{font-size:9px;letter-spacing:2px}.desktop-note h2{font-family:"Songti SC","STSong",serif;font-size:23px;line-height:1.8;font-weight:400;margin:17px 0}.desktop-note p{font-size:11px;line-height:2;color:#7d8975}.desktop-note button{margin:16px 0 45px;font-size:11px}.desktop-note .small{font-size:10px}.phone{border-left:1px solid #d7dfce;border-right:1px solid #d7dfce}.player-page .desktop-intro,.player-page .desktop-note{opacity:.65}}@media(max-width:359px){#view{padding-left:18px;padding-right:18px}.greeting{font-size:28px}.cover{height:173px}.cover-title{font-size:20px;padding:19px 14px}.course-grid{gap:17px 12px}.player-heading h2{font-size:19px}.transport{gap:0}.detail-hero{gap:15px}.detail-hero .cover{width:117px}.detail-info h1{font-size:21px}.header-actions{gap:3px}}@media(prefers-reduced-motion:reduce){*,*:before,*:after{scroll-behavior:auto!important;transition:none!important;animation:none!important}}