: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}body{margin:0;min-width:320px;min-height:100vh;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 Roman,serif;font-size:24px}.upload-button{background:transparent;border:1px solid #535c68;border-radius:999px;padding:10px 16px;font-weight:600}.upload-button:hover{border-color:var(--accent);color:var(--accent)}.upload-button input{display:none}.topbar-actions{display:flex;align-items:center;gap:12px}.signed-in-as{color:var(--muted);font-size:12px}.signout-button{color:#fff;background:transparent;border:0;padding:8px}.hero{display:flex;align-items:end;justify-content:space-between;padding:32px 4px 24px}.eyebrow{color:var(--accent);text-transform:uppercase;letter-spacing:.16em;font-size:11px;font-weight:700;margin:0 0 8px}h1{font-family:Georgia,Times New 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 button:disabled{opacity:.45;cursor:not-allowed}.score-card{background:var(--paper);color:var(--ink);border-radius:18px;overflow:hidden;box-shadow:0 28px 80px #0008}.score-toolbar{min-height:42px;padding:0 18px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid #d9d4c8;color:#565a61;font-size:12px;text-transform:uppercase;letter-spacing:.1em;font-weight:700}.score-scroll{height:min(48vh,520px);min-height:300px;overflow:auto;padding:10px 20px 28px}.score{min-width:720px}.transport{display:flex;flex-wrap:wrap;align-items:end;gap:10px;margin:18px 0;padding:14px;background:#191e26;border:1px solid var(--line);border-radius:14px}.transport button{border:1px solid #434b58;color:#fff;background:#252c36;min-width:46px;height:44px;border-radius:10px;font-weight:700}.transport button:hover{border-color:var(--accent)}.transport .play{min-width:88px;background:var(--accent);color:var(--ink);border-color:var(--accent)}.transport label{display:grid;gap:4px;color:var(--muted);font-size:11px;text-transform:uppercase;letter-spacing:.08em}.transport select{height:44px;color:#fff;background:#252c36;border:1px solid #434b58;border-radius:10px;padding:0 28px 0 11px}.time{min-width:100px;padding:12px 8px;font-variant-numeric:tabular-nums;color:#cbd0d7}.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}.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:100vh;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 label{display:grid;gap:7px;color:#cbd0d7;font-size:13px;font-weight:600}.login-card input{width:100%;height:48px;border-radius:10px;border:1px solid #434b58;background:#101319;color:#fff;padding:0 13px}.login-card input:focus{outline:2px solid var(--accent);outline-offset:2px}.login-submit{height:48px;border:0;border-radius:10px;background:var(--accent);color:var(--ink);font-weight:800}.login-error{color:#ffdce1;background:#341b20;border:1px solid #9e4953;border-radius:9px;padding:11px}@media(max-width:700px){main{padding:0 12px 24px}.hero{align-items:start}.lesson-stat{display:none}.score-scroll{padding-inline:8px}.library-card{align-items:stretch;flex-direction:column}.transport{align-items:stretch}.transport label{flex:1 1 120px}.time{order:3;width:100%}}