@charset "UTF-8";
:root{--bg:#f6f5f0;--paper:#fff;--ink:#252936;--muted:#7d818e;--line:#e9e9e5;--blue:#4555dc;--blue-soft:#f0f1fc;--green:#397d64}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font:14px/1.6 "Segoe UI","Microsoft YaHei",sans-serif}button,input,select{font:inherit}button,a,input,select{-webkit-tap-highlight-color:transparent}button{cursor:pointer}button:disabled{cursor:default}button:focus-visible,a:focus-visible,select:focus-visible,input:focus-visible{outline:3px solid #9ca7ff;outline-offset:4px}button{transition:background .18s,transform .18s,border-color .18s}button:not(:disabled):active{transform:translateY(1px)}.shell{display:flex;min-height:100vh}.sidebar{width:216px;flex-shrink:0;background:#fdfcf8;border-right:1px solid var(--line);padding:37px 22px;position:fixed;inset:0 auto 0 0;display:flex;flex-direction:column}.brand{display:flex;align-items:center;gap:12px;text-decoration:none;color:var(--ink);font-weight:700;font-size:25px;letter-spacing:3px}.brand-mark{width:42px;height:47px;background:var(--blue);color:#fff;border-radius:14px;display:grid;place-items:center;font-size:31px;font-weight:400;letter-spacing:0}.brand small{display:block;font-size:9px;letter-spacing:2px;line-height:1.1;color:#7f8394;margin-top:3px}.side-section{margin:58px 12px 15px;font-size:11px;color:#91939c;letter-spacing:1px}.nav-item{display:flex;align-items:center;gap:12px;padding:13px 14px;border-radius:8px;font-weight:600}.nav-item.active{color:var(--blue);background:#edeeFA}.nav-item>span:first-child{font-size:19px}.nav-dot{width:5px;height:5px;background:var(--blue);border-radius:100%;margin-left:auto}.side-note{margin:auto 15px 42px;color:#858998}.tiny-wave{color:#b6bbd4;letter-spacing:4px}.side-note p{font-size:18px;line-height:1.9;font-family:Georgia,"Microsoft 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p{color:#858994;margin:0;font-size:12px;letter-spacing:.5px}.intro-badge{width:130px;display:flex;align-items:center;flex-direction:column;color:#9a9eae;transform:rotate(8deg)}.intro-badge>span{font-size:50px;font-family:Georgia;line-height:1.2;color:#b1b6d0}.intro-badge small{font-size:10px;letter-spacing:2px}.workspace{display:grid;grid-template-columns:minmax(420px,1fr) 274px;gap:25px;align-items:start}.practice-card{border:1px solid #e4e5e0;border-radius:14px;background:var(--paper);overflow:hidden;box-shadow:0 3px 9px #313e3911}.card-top{display:flex;justify-content:space-between;align-items:center;padding:21px 26px 16px;font-size:11px;color:#9497a2}.mode-label{display:flex;align-items:center;gap:7px;color:#5e6476;font-weight:600}.mode-label i{height:6px;width:6px;background:var(--blue);border-radius:50%}.progress-track{height:3px;background:#f1f2f5;margin:0 26px}.progress-track>div{height:100%;background:var(--blue);width:0;transition:width .3s}.sound-stage{text-align:center;padding:25px 20px 24px}.stage-overline{color:#9195a5;font-size:10px;letter-spacing:2px}.sound-orb{position:relative;display:grid;place-items:center;width:134px;height:134px;margin:16px auto 11px;border-radius:50%;background:radial-gradient(circle,#edefff 0,#f6f7ff 54%,#fff 72%)}.orb-ring{position:absolute;inset:11px;border:1px solid #e9ebfa;border-radius:50%}.r2{inset:0;border-style:dashed;border-color:#eeeff9}.wave{height:45px;display:flex;align-items:center;gap:5px}.wave i{display:block;width:4px;border-radius:8px;background:#5968e1;height:16px}.wave i:nth-child(2),.wave i:nth-child(8){height:25px}.wave i:nth-child(3),.wave i:nth-child(7){height:36px}.wave i:nth-child(4),.wave i:nth-child(6){height:25px}.wave i:nth-child(5){height:45px}.playing .wave i{animation:pulse .65s infinite alternate}.playing .wave i:nth-child(even){animation-delay:-.4s}.playing .r1{animation:ring 1s infinite}.sound-stage h2{font-size:22px;letter-spacing:1px;font-weight:600;margin:0 0 5px}.sound-stage>p{font-size:12px;color:#9094a2;min-height:20px;margin:0 0 19px}.primary{background:var(--blue);color:#fff;border:0;border-radius:8px;padding:13px 22px;font-size:13px;box-shadow:0 4px 8px #4555dc21}.primary:hover{background:#3546cd}.primary:disabled{background:#8992e5}.start-button{min-width:190px;display:inline-flex;gap:15px;align-items:center;justify-content:center}.start-button>span:first-child{font-size:10px}.button-arrow{font-size:17px;margin-left:14px}.listen-row{display:flex;align-items:center;padding:0 26px 25px;gap:12px}.listen-button{display:flex;align-items:center;gap:12px;background:#fafafa;border:1px solid #eaeaf0;border-radius:9px;padding:13px 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strong{font-size:12px;font-weight:500}.answer-heading>span{color:#a0a4af;font-size:10px}.answer-grid{display:grid;grid-template-columns:repeat(7,1fr);gap:8px}.answer-grid.chromatic{grid-template-columns:repeat(6,1fr)}.answer-grid.three{grid-template-columns:repeat(3,1fr)}.answer-key{position:relative;background:#fff;border:1px solid #dfe2e9;border-bottom:3px solid #dfe2e9;border-radius:7px;height:76px;color:#505667;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:0}.answer-key>strong{font-size:19px;font-weight:500}.answer-key>small{font-size:10px;color:#9499a8}.answer-key>sup{position:absolute;top:4px;right:6px;font-size:8px;color:#b7bbc6}.answer-key:disabled{color:#a4a8b5;background:#fbfbfc;border-color:#ebecf1}.answer-key:hover:not(:disabled){border-color:#8c98ef;background:#f3f4ff;color:var(--blue)}.answer-key.correct{border-color:#6aa68d;background:#eef7f1;color:#32765b}.answer-key.wrong{border-color:#d7a38f;background:#fcf1eb;color:#a46850}.answer-key.correct small,.answer-key.wrong small{color:inherit}.answer-key.correct:after{content:'✓';position:absolute;top:3px;left:6px;font-size:10px}.feedback{display:flex;align-items:center;gap:7px;color:#959aa7;font-size:11px;min-height:45px;padding-top:10px}.feedback-dot{width:4px;height:4px;background:currentColor;border-radius:50%;flex-shrink:0}.feedback.success{color:#3c7e65}.feedback.error{color:#a4664f}.card-bottom{display:flex;align-items:center;justify-content:space-between;padding:12px 26px;background:#fcfcfa;border-top:1px solid #eff0ec;font-size:10px;color:#a0a4aa}.card-bottom>span>span{margin-left:6px}.text-button{border:0;background:none;color:#8c91a0;font-size:10px;padding:4px 0}.text-button:hover:not(:disabled){color:var(--blue)}.text-button:disabled{opacity:.5}.stats{display:grid;grid-template-columns:repeat(4,1fr);margin-top:21px;border:1px solid #e6e7e1;border-radius:11px;padding:18px 0;background:#fafaf7}.stats>div{padding:0 20px;border-right:1px solid #e5e7e1}.stats>div:last-child{border:0}.stats 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