:root{--ink:#17273d;--muted:#67758a;--paper:#fff;--line:#e3e9f1;--bg:#f6f8fc;--mint:#1b9b85;--mint2:#e6f8f2;--purple:#6557ce;--amber:#d88d19;--red:#d8515c;--radius:22px}
*{box-sizing:border-box}html{font-family:ui-sans-serif,-apple-system,BlinkMacSystemFont,"Noto Sans TC","PingFang TC","Microsoft JhengHei",sans-serif}body{margin:0;background:var(--bg);color:var(--ink);min-height:100vh}button,select{font:inherit}button{cursor:pointer}button:focus-visible,select:focus-visible{outline:3px solid #7c71da;outline-offset:3px}.wrap{max-width:1140px;margin:0 auto;padding:30px 24px 70px}.top{display:flex;justify-content:space-between;align-items:center;gap:20px;margin-bottom:28px}.brand{display:flex;align-items:center;gap:13px}.logo{display:grid;place-items:center;width:48px;height:48px;background:#17273d;color:white;border-radius:15px;font-size:27px;box-shadow:0 6px 16px #15284024}.eyebrow{font-size:12px;letter-spacing:.11em;font-weight:800;color:var(--mint);text-transform:uppercase}.brand h1{font-size:24px;margin:2px 0 0;letter-spacing:-.04em}.top-tag{border:1px solid var(--line);background:white;padding:10px 14px;border-radius:100px;font-size:13px;color:#57647c;font-weight:700}.intro{display:flex;align-items:end;justify-content:space-between;gap:14px;margin-bottom:20px}.intro h2{font-size:clamp(23px,3vw,34px);letter-spacing:-.045em;margin:0 0 8px;font-weight:850}.intro p{margin:0;color:var(--muted);line-height:1.65}.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin:0 0 20px}.stat{background:white;border:1px solid var(--line);border-radius:18px;padding:15px 18px;display:flex;align-items:center;gap:14px}.stat-ic{border-radius:13px;width:40px;height:40px;display:grid;place-items:center;font-size:21px;background:#fff5df}.stat:nth-child(2) .stat-ic{background:#eae7fe}.stat:nth-child(3) .stat-ic{background:#e6f7f2}.stat label{display:block;font-size:12px;color:var(--muted);font-weight:700;margin-bottom:3px}.stat strong{font-size:21px;letter-spacing:-.035em}.layout{display:grid;grid-template-columns:minmax(0,1.7fr) minmax(275px,1fr);gap:18px;align-items:start}.panel{background:white;border:1px solid var(--line);border-radius:var(--radius);box-shadow:0 5px 22px #1b2e4e08}.main{padding:25px 28px 26px}.panel-head{display:flex;align-items:center;justify-content:space-between;gap:10px}.kicker{color:var(--purple);font-weight:850;font-size:13px;letter-spacing:.03em}.counter{font-size:13px;color:var(--muted);font-weight:800;font-variant-numeric:tabular-nums}.progress{margin-top:13px;height:10px;background:#e9edf3;border-radius:99px;overflow:hidden}.progress>span{height:100%;display:block;background:linear-gradient(90deg,#2dbca1,#70d7a3);border-radius:99px;transition:width .25s}.prompt{margin:23px 0 3px;font-size:24px;letter-spacing:-.035em}.subprompt{color:var(--muted);font-size:14px;margin:0 0 8px;line-height:1.5}.staff-wrap{background:linear-gradient(180deg,#fbfcff,#f6f9ff);border:1px solid #e9edf7;border-radius:20px;padding:13px 15px 10px;margin:12px 0 12px}.staff{display:block;width:100%;height:auto;max-height:284px}.music-symbol{font-family:'Apple Symbols','FreeSerif','Noto Music','Segoe UI Symbol',serif}.staff-caption{display:flex;justify-content:space-between;align-items:center;padding:0 8px 4px;font-size:12px;color:#78849b;font-weight:700}.subtools{display:flex;justify-content:space-between;align-items:center;gap:8px;margin:4px 0 14px}.text-btn{border:0;background:transparent;color:#4c5c75;padding:9px 4px;font-size:13px;font-weight:750}.text-btn:hover{color:var(--purple)}.answer-title{font-size:13px;font-weight:800;color:#6c788d;margin-bottom:10px}.answers{display:grid;grid-template-columns:repeat(7,minmax(0,1fr));gap:9px}.note-btn{background:white;border:2px solid #e0e7f1;box-shadow:0 3px 0 #dae1ec;border-radius:13px;min-height:65px;color:#25354c;font-size:24px;font-weight:850;transition:.12s transform,.12s background,.12s border-color}.note-btn:hover:not(:disabled){transform:translateY(-2px);border-color:#958bef;background:#f8f6ff}.note-btn:disabled{cursor:default}.note-btn.is-correct{border-color:#31aa86;background:#e4f9ee;color:#087c5a;box-shadow:0 3px 0 #9edbc8}.note-btn.is-wrong{border-color:#df6670;background:#fff0f1;color:#b63441;box-shadow:0 3px 0 #f0b7bd}.feedback{padding:14px 16px;border-radius:15px;margin-top:16px;display:none;gap:10px;align-items:flex-start;line-height:1.55}.feedback.show{display:flex}.feedback.yes{background:#e9f9f2;color:#116e53}.feedback.no{background:#fff1f0;color:#99333e}.fb-icon{font-size:20px;font-weight:900}.feedback strong{display:block}.feedback p{font-size:13px;margin:2px 0 0}.primary{border:none;border-radius:14px;padding:13px 20px;font-weight:850;background:var(--mint);color:white;box-shadow:0 4px 0 #117c6a}.primary:hover{background:#178b79}.primary:active{transform:translateY(2px);box-shadow:0 2px 0 #117c6a}.primary:disabled{opacity:.45;cursor:default}.next-row{margin-top:16px;display:flex;justify-content:flex-end}.side{display:flex;flex-direction:column;gap:18px}.side .panel{padding:23px}.side h3{font-size:17px;margin:0 0 17px;letter-spacing:-.025em}.form-label{display:block;color:#67748a;font-size:12px;font-weight:800;margin-bottom:7px}.field{margin-bottom:16px}select{width:100%;border:1px solid #dce4ee;border-radius:12px;background:#fafbfe;padding:12px 13px;color:#23344d;font-size:14px;font-weight:700;appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20'%3E%3Cpath d='m5 7 5 5 5-5' fill='none' stroke='%235a6a80' stroke-width='2'/%3E%3C/svg%3E");background-position:right 12px center;background-size:17px;background-repeat:no-repeat}.side-note{background:#f7f8fd;border-radius:12px;padding:12px 13px;color:#68758a;font-size:12px;line-height:1.75}.mini-action{border:1px solid #dce4ee;background:white;border-radius:10px;padding:9px 12px;font-size:12px;font-weight:800;color:#5f6d81}.mini-action:hover{border-color:#9a91df}.landmarks{list-style:none;padding:0;margin:0}.landmarks li{display:flex;justify-content:space-between;gap:10px;border-top:1px solid #edf0f5;padding:12px 0;font-size:13px;color:#586780}.landmarks li:first-child{border-top:0;padding-top:0}.landmarks b{color:#2a3850;font-weight:800}.footer{margin-top:24px;text-align:center;color:#8b96a8;font-size:12px;line-height:1.8}.result{display:none;padding:36px 22px 28px;text-align:center}.result.show{display:block}.medal{font-size:60px;line-height:1}.result h2{font-size:30px;letter-spacing:-.04em;margin:15px 0 6px}.result p{color:#64738a;line-height:1.65;margin:0 0 17px}.result-numbers{display:flex;justify-content:center;gap:14px;margin-bottom:22px}.result-numbers>div{min-width:110px;padding:14px;background:#f5f8fc;border-radius:14px}.result-numbers strong{font-size:24px;display:block}.result-numbers small{color:#728098;font-weight:750}.result-actions{display:flex;justify-content:center;gap:10px;flex-wrap:wrap}.hintbar{background:#f0effd;border:1px solid #ddd7ff;border-radius:13px;padding:11px 13px;color:#4a419e;font-size:13px;line-height:1.6;display:none;margin-bottom:13px}.hintbar.show{display:block}.hidden{display:none!important}.backup-actions{display:flex;gap:8px;flex-wrap:wrap}.backup-actions button{flex:1 1 140px}.backup-status{margin-top:12px;padding:10px 12px;border-radius:10px;background:#f2f8f7;font-size:12px;line-height:1.65;color:#366356}.backup-help{font-size:12px;color:var(--muted);line-height:1.75;margin:0 0 13px}@media(max-width:760px){.wrap{padding:17px 12px 50px}.top{margin-bottom:22px}.top-tag{display:none}.intro h2{font-size:26px}.stats{gap:7px}.stat{padding:11px;gap:8px;border-radius:14px}.stat-ic{width:30px;height:30px;font-size:17px}.stat strong{font-size:18px}.stat label{font-size:10px}.layout{grid-template-columns:1fr}.main{padding:19px 15px 20px}.prompt{font-size:22px}.answers{gap:5px}.note-btn{font-size:19px;min-height:55px;border-radius:10px}.side .panel{padding:20px}.staff-wrap{padding:8px 3px}.staff-caption{padding:0 10px 7px}}@media(prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important}}

/* v3 authentication and sync additions */
.auth-screen{min-height:100vh;display:grid;place-items:center;padding:20px}.auth-card{display:flex;flex-direction:column;gap:13px;background:#fff;border:1px solid var(--line);border-radius:22px;box-shadow:0 8px 32px #142b4b17;padding:32px;width:min(100%,420px)}.auth-card h2{margin:8px 0 0}.auth-card p{font-size:14px;color:var(--muted);line-height:1.6;margin:0}.auth-card label{font-size:13px;font-weight:750}.auth-card input{width:100%;font:inherit;border:1px solid #cfd8e6;border-radius:12px;padding:13px 15px}.auth-card .primary{margin-top:5px}.auth-card .auth-message{color:#99333e;min-height:22px}.backup-status.error{background:#fff1f0;color:#99333e}.backup-status.success{background:#e9f9f2;color:#116e53}button:disabled{cursor:wait}