:root{font-family:Inter,ui-sans-serif,system-ui,-apple-system,Segoe UI,sans-serif;color:#f5f2e9;background:#101319;font-synthesis:none;--ink: #101319;--paper: #f8f5ec;--muted: #9fa6b2;--accent: #d8ff63;--accent-2: #79d9ff;--line: #2a303b}*{box-sizing:border-box}html,body,#root{min-height:100%}body{margin:0;min-width:320px;min-height:100dvh;background:radial-gradient(circle at 80% -10%,#27313c 0,transparent 38%),#101319}button,select,input{font:inherit}button,.upload-button{cursor:pointer}main{width:min(1440px,100%);margin:0 auto;padding:0 28px 36px}.topbar{height:76px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line)}.brand{display:flex;align-items:center;gap:12px;color:inherit;text-decoration:none;font-weight:700;letter-spacing:-.02em;font-size:20px}.brand-mark{display:grid;place-items:center;width:36px;height:36px;border-radius:10px;background:var(--accent);color:var(--ink);font-family:Georgia,Times New 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Roman,serif;font-size:clamp(36px,5vw,64px);line-height:1;margin:0;letter-spacing:-.04em}.hero p:last-child{color:var(--muted);margin:12px 0 0}.dot{padding:0 7px}.lesson-stat{display:flex;flex-direction:column;align-items:end;color:var(--muted)}.lesson-stat strong{color:var(--accent-2);font:700 32px Georgia,Times New Roman,serif}.error{margin-bottom:18px;border:1px solid #9e4953;background:#341b20;color:#ffdce1;padding:13px 16px;border-radius:10px}.library-card{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-bottom:18px;padding:14px 16px;background:#191e26;border:1px solid var(--line);border-radius:14px}.library-card strong{font-size:18px}.library-actions{display:flex;flex-wrap:wrap;gap:8px}.library-actions select,.library-actions button{height:40px;border:1px solid #434b58;border-radius:9px;background:#252c36;color:#fff;padding:0 12px}.library-actions 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#434b58;border-radius:10px;padding:0 28px 0 11px}.time{min-width:100px;padding:12px 8px;font-variant-numeric:tabular-nums;color:#cbd0d7}.options-toggle{display:none}.transport-options{display:flex;align-items:end;gap:10px}.now-playing{display:flex;justify-content:space-between;align-items:end;padding:8px 4px 12px;color:var(--muted)}.now-playing strong{color:#fff;font-size:22px}.piano-shell{overflow-x:auto;padding-bottom:12px;scroll-behavior:smooth;overscroll-behavior-x:contain;scrollbar-width:thin}.piano{--white-count: 14;position:relative;display:flex;min-width:660px;height:190px;border:1px solid #000;border-radius:0 0 12px 12px;overflow:hidden;background:#fff}.white-key{position:relative;flex:1 0 calc(100% / var(--white-count));background:linear-gradient(#fff,#e9e6df);border-right:1px solid #777;color:#666;transition:background .08s,transform .08s}.white-key span{position:absolute;bottom:8px;width:100%;text-align:center;font-size:10px}.white-key.active{background:linear-gradient(#ebffae,var(--accent));box-shadow:inset 0 0 22px #94b829;transform:translateY(3px)}.white-key.strike{animation:white-strike .36s ease-out both}.black-key{position:absolute;z-index:2;top:0;width:calc(100% / var(--white-count) * .56);height:62%;background:linear-gradient(90deg,#17191d,#030405);border-radius:0 0 6px 6px;box-shadow:0 4px 6px #0007;transform:translate(-50%);transition:background .08s,height .08s}.black-key.active{background:linear-gradient(#99eaff,#20aed7);height:64%;box-shadow:0 2px 16px #79d9ff}.black-key.strike{animation:black-strike .36s ease-out both}@keyframes white-strike{0%{background:#fff;box-shadow:inset 0 0 #fff;filter:brightness(1)}14%{background:#f7ffd8;box-shadow:inset 0 0 34px #d8ff63,0 0 20px #d8ff63aa;filter:brightness(1.25)}45%{background:linear-gradient(#efffb9,#bfe64f);box-shadow:inset 0 0 18px #94b829;filter:brightness(1.05)}to{background:linear-gradient(#e8f7bc,#a9cc49);box-shadow:inset 0 0 10px #78942788;filter:brightness(.9)}}@keyframes black-strike{0%{background:#14171b;box-shadow:0 4px 6px #0007;filter:brightness(1)}14%{background:#bff3ff;box-shadow:0 0 22px #79d9ff;filter:brightness(1.3)}45%{background:linear-gradient(#79d9ff,#168bad);box-shadow:0 2px 13px #79d9ffaa;filter:brightness(1)}to{background:linear-gradient(#4ca8c1,#14677d);box-shadow:0 2px 8px #2a91aa88;filter:brightness(.82)}}footer{padding:20px 4px 0;color:#747c88;font-size:12px}.login-page{min-height:100dvh;display:grid;place-items:center;padding:24px}.login-card{width:min(440px,100%);padding:38px;border:1px solid var(--line);border-radius:20px;background:#191e26;box-shadow:0 30px 90px #0008}.login-brand{margin-bottom:42px}.login-card h1{font-size:48px}.login-copy{color:var(--muted);margin:14px 0 28px}.login-card form{display:grid;gap:18px}.login-card form 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env(safe-area-inset-bottom))}.topbar{position:sticky;top:0;z-index:30;height:54px;margin-inline:-8px;padding:0 10px;background:#101319ee;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px)}.brand{gap:7px;font-size:15px}.brand-mark{width:30px;height:30px;border-radius:8px;font-size:20px}.brand>span:last-child{display:none}.mobile-title{display:block;flex:1;margin-inline:10px;text-align:center}.topbar-actions{gap:5px}.signed-in-as{display:none}.account-button,.upload-button{min-height:38px;padding:8px 11px;font-size:12px}.signout-button{font-size:12px}.public-catalog{margin:8px 0;padding:12px;border-radius:11px}.catalog-grid{grid-template-columns:1fr;max-height:42dvh;overflow-y:auto}.catalog-grid button{min-height:54px}.lesson-heading{padding:12px 4px 10px}.lesson-heading .eyebrow{display:none}.lesson-heading h1{font-size:clamp(24px,8vw,34px);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.hero p:last-child{margin-top:5px;font-size:12px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.lesson-stat{display:none}.error{margin-bottom:8px}.library-card{align-items:stretch;flex-direction:column;margin-bottom:8px;padding:10px}.library-card>div:first-child{display:none}.library-actions{display:grid;grid-template-columns:1fr 1fr}.library-actions select{grid-column:1 / -1;width:100%}.score-card{border-radius:10px;box-shadow:none}.score-toolbar{min-height:32px;padding:0 10px;font-size:10px}.score-scroll{height:42dvh;min-height:245px;padding:4px 4px 16px;overscroll-behavior:contain}.score{min-width:620px}.transport{position:fixed;z-index:25;left:0;right:0;bottom:0;margin:0;padding:8px max(8px,env(safe-area-inset-left)) calc(8px + env(safe-area-inset-bottom));border-width:1px 0 0;border-radius:0;background:#151a22f5;-webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);align-items:center}.transport-primary{flex:0 0 auto}.transport button{min-width:44px;height:44px}.transport .play{min-width:72px}.time{flex:1;min-width:75px;padding:10px 3px;font-size:12px;text-align:center}.options-toggle{display:block;min-width:auto!important;padding-inline:10px;font-size:11px}.transport-options{display:none;flex:1 0 100%;grid-template-columns:1fr 1fr;gap:8px;padding-top:8px;border-top:1px solid var(--line)}.transport-options.shown{display:grid}.transport label{width:100%}.transport select{width:100%;height:40px}.now-playing{padding:8px 4px 6px}.now-playing .eyebrow{margin-bottom:3px}.now-playing strong{font-size:16px}.now-playing>span{font-size:11px}.piano-shell{margin-inline:-8px;padding:0 0 6px;scrollbar-width:none}.piano-shell::-webkit-scrollbar{display:none}.piano{min-width:760px;height:140px;border-radius:0}footer{display:none}.auth-overlay{align-items:start;padding:max(12px,env(safe-area-inset-top)) 8px 12px}.auth-dialog,.login-card{width:100%}.login-card{padding:30px 20px 24px;border-radius:14px}.login-brand{margin-bottom:30px}.login-card h1{font-size:38px}}@media(max-width:390px){.account-button{max-width:126px;line-height:1.05}.transport{gap:6px}.transport-primary{gap:5px}.transport .play{min-width:64px}.options-toggle{padding-inline:7px}}