:root{--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light;--bg:#f3f6fc;--surface:#fff;--ink:#172a49;--muted:#586983;--line:#d9e1ef;--brand:#2157ad;--tint:#e9f0fc;--shadow:0 12px 40px #1f46700a;background:var(--bg);color:var(--ink);font-synthesis:none;font-family:Avenir Next,PingFang SC,Microsoft YaHei,sans-serif}*{box-sizing:border-box}body{margin:0}button,input,select{font:inherit}button{cursor:pointer;touch-action:manipulation;border:1px solid var(--line);background:var(--surface);color:var(--ink);border-radius:12px;min-height:48px;padding:10px 16px}button:active{background:var(--tint)}button:disabled{opacity:.5;cursor:default}button:focus-visible,input:focus-visible,select:focus-visible,a:focus-visible{outline:3px solid var(--brand);outline-offset:3px}input,select{border:1px solid var(--line);background:var(--surface);min-height:48px;color:var(--ink);border-radius:10px;width:100%;padding:12px}input[type=range]{accent-color:var(--brand);padding:4px}label{color:var(--muted);gap:8px;font-size:15px;display:grid}h1{letter-spacing:-.7px;margin:8px 0 24px;font-size:30px;line-height:1.35}h2{margin:0;font-size:21px}h3{font-size:19px}p{line-height:1.7}svg{flex-shrink:0;width:24px;height:24px}.app{max-width:760px;min-height:100dvh;margin:auto}.brand{padding:calc(20px + env(safe-area-inset-top)) 24px 20px;align-items:center;gap:12px;font-size:21px;font-weight:650;display:flex}.brand small{color:var(--muted);letter-spacing:.4px;font-size:12px;font-weight:500;display:block}.brand-icon{object-fit:contain;color:#fff;background:var(--brand);border-radius:13px;flex-shrink:0;place-items:center;width:42px;height:42px;display:grid}.avatar{border-radius:50%;width:48px;margin-left:auto;padding:10px}.app main{padding:4px 24px calc(116px + env(safe-area-inset-bottom))}.welcome{padding:14px 0 20px}.welcome p,.kicker{color:var(--muted);margin:4px 0 12px;font-size:14px}.welcome h1{margin-bottom:10px;font-size:36px;font-weight:650;line-height:1.45}.section-head{justify-content:space-between;align-items:center;gap:12px;margin:8px 0 16px;display:flex}.section-head button{color:var(--brand);background:0 0;border:0;padding:8px}.lesson{background:var(--surface);border:1px solid var(--line);box-shadow:var(--shadow);border-radius:20px;margin-bottom:16px;padding:24px}.lesson time{color:var(--brand);font-size:14px;font-weight:600}.lesson-body{white-space:pre-wrap;overflow-wrap:anywhere;margin:16px 0;font-size:17px;line-height:1.9}.bpm-link{background:var(--tint);color:var(--brand);border:0;align-items:center;gap:8px;margin:4px 8px 0 0;font-size:14px;display:inline-flex}.bpm-link svg{width:20px}.quick-tools{grid-template-columns:1fr 1fr;gap:16px;margin-top:24px;display:grid}.quick-tools button{text-align:left;background:var(--tint);border:0;gap:10px;min-height:160px;padding:22px 18px;display:grid}.quick-tools button:last-child{background:var(--surface);border:1px solid var(--line)}.quick-tools svg{width:30px;height:30px;color:var(--brand)}.quick-tools strong{font-size:20px}.quick-tools span{color:var(--muted);font-size:13px}.bottom-nav{z-index:5;width:100%;max-width:760px;padding:12px 16px calc(12px + env(safe-area-inset-bottom));background:var(--surface);border-top:1px solid var(--line);grid-template-columns:repeat(4,1fr);gap:8px;display:grid;position:fixed;bottom:0;left:50%;transform:translate(-50%)}.bottom-nav button{color:var(--muted);background:0 0;border:0;justify-items:center;gap:5px;padding:8px 0;font-size:12px;display:grid}.bottom-nav button[aria-current]{color:var(--brand);background:var(--tint)}.empty{text-align:center;border:1px dashed var(--line);background:var(--surface);border-radius:20px;padding:32px 22px}.empty>svg{width:36px;height:36px;color:var(--brand)}.empty p{color:var(--muted);font-size:15px}.primary{background:var(--brand);color:#fff;border-color:var(--brand);font-weight:600}.primary:active{filter:brightness(.9);background:var(--brand)}.sync-time{color:var(--muted);text-align:center;margin-top:24px;font-size:12px}.notice,.offline{background:var(--tint);overflow-wrap:anywhere;border-radius:12px;padding:14px 16px;font-size:14px}.offline{border:1px solid var(--line)}.hint{color:var(--muted);font-size:13px}.pill{white-space:nowrap;background:var(--tint);color:var(--brand);border-radius:24px;padding:8px 12px;font-size:12px}.metro{padding:16px 0}.metro h1{margin:0}.tempo{text-align:center;color:var(--muted);flex-direction:column;margin:40px 0 20px;display:flex}.tempo-number{letter-spacing:-5px;color:var(--ink);font-variant-numeric:tabular-nums;font-size:100px;font-weight:500;line-height:1.2}.tempo-adjust{justify-content:center;gap:12px;margin-bottom:24px;display:flex}.tempo-adjust button:first-child,.tempo-adjust button:nth-child(2){width:56px;padding:0;font-size:28px}.beat-row{justify-content:center;gap:12px;margin:26px 0;display:flex}.beat{border:1px solid var(--line);width:38px;height:38px;color:var(--muted);border-radius:50%;place-items:center;display:grid}.beat.on{background:var(--brand);color:#fff;border-color:var(--brand)}.start{width:100%;min-height:58px;font-size:18px}.settings{grid-template-columns:1fr 1fr;gap:20px 16px;margin:28px 0;display:grid}.song-search{grid-template-columns:1.4fr 1fr;gap:16px;display:grid}.song-list{margin:24px 0}.song{text-align:left;border:0;border-bottom:1px solid var(--line);background:0 0;border-radius:0;align-items:center;gap:14px;width:100%;padding:18px 8px;display:flex}.song>span:nth-child(2){flex:1;min-width:0}.song strong{overflow-wrap:anywhere;font-size:16px;display:block}.song small{color:var(--muted);margin-top:5px;display:block}.song.selected{background:var(--tint)}.song-symbol{color:var(--brand);font-size:28px}.player{background:var(--surface);border:1px solid var(--line);border-radius:20px;padding:20px}.player h2{margin-bottom:16px;font-size:18px}audio{width:100%;margin:8px 0}.player-actions{gap:8px;display:flex}.player-actions button{flex:1;padding:8px;font-size:13px}.account{background:var(--surface);border:1px solid var(--line);border-radius:20px;gap:16px;margin:20px 0;padding:24px;display:grid}.account p{color:var(--muted);margin:0}.theme-label{margin-top:24px}.load-more{width:100%}.skip{background:var(--surface);z-index:10;padding:16px;position:fixed;top:-100px}.skip:focus{top:0}@media (width<=360px){.brand,.app main{padding-left:16px;padding-right:16px}.welcome h1{font-size:32px}.lesson{padding:20px}.beat-row{gap:8px}.beat{width:34px;height:34px}}@media (width>=650px){.app main,.brand{padding-left:40px;padding-right:40px}.welcome{padding-top:30px}.welcome h1{font-size:42px}}:root[data-theme=dark]{--lightningcss-light: ;--lightningcss-dark:initial;color-scheme:dark;--bg:#111c30;--surface:#1a2941;--ink:#ecf2ff;--muted:#b0bfd5;--line:#3b4e6b;--brand:#9cc4ff;--tint:#243d61;--shadow:none}:root[data-theme=dark] .primary,:root[data-theme=dark] .brand-icon{color:#102342}@media (prefers-color-scheme:dark){:root:not([data-theme=light]){--lightningcss-light: ;--lightningcss-dark:initial;color-scheme:dark;--bg:#111c30;--surface:#1a2941;--ink:#ecf2ff;--muted:#b0bfd5;--line:#3b4e6b;--brand:#9cc4ff;--tint:#243d61;--shadow:none}:root:not([data-theme=light]) .primary,:root:not([data-theme=light]) .brand-icon{color:#102342}}@media (prefers-reduced-motion:reduce){*,:before,:after{scroll-behavior:auto!important;transition:none!important;animation:none!important}}.brand-logo{aspect-ratio:1419/865;background-color:#2b2a29;flex-shrink:0;width:64px;display:block;-webkit-mask-position:50%;mask-position:50%;-webkit-mask-size:contain;mask-size:contain;-webkit-mask-repeat:no-repeat;mask-repeat:no-repeat}:root[data-theme=dark] .brand-logo{background-color:#dfe5ee}@media (prefers-color-scheme:dark){:root:not([data-theme=light]) .brand-logo{background-color:#dfe5ee}}