:root{font-family:Inter,Noto Sans SC,Microsoft YaHei,system-ui,-apple-system,BlinkMacSystemFont,sans-serif;color:#18241f;background:#f4f0e7;font-synthesis:none;text-rendering:optimizeLegibility;--ink: #12211b;--green: #235c47;--green-soft: #dce9df;--cream: #f4f0e7;--paper: #fffdf7;--gold: #e8b35e;--gold-soft: #f6e7c8;--red: #a63c34;--red-soft: #f3deda;--border: rgba(18, 33, 27, .14);--shadow: 0 18px 50px rgba(28, 47, 38, .09)}*{box-sizing:border-box}html{min-width:320px;min-height:100%;background:var(--cream)}body{margin:0;min-width:320px;min-height:100vh;min-height:100dvh;background:radial-gradient(circle at 85% 8%,rgba(232,179,94,.14),transparent 28rem),var(--cream)}button,input,select{font:inherit}button,a{-webkit-tap-highlight-color:transparent}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid rgba(35,92,71,.3);outline-offset:2px}a{color:inherit}h1,h2,p{margin-top:0}h1,h2,.brand,.notation-pair strong,.score-ring strong,.result-score strong{font-family:Georgia,"Noto Serif SC",Songti SC,serif}.app-shell{min-height:100vh;min-height:100dvh}.topbar{position:sticky;top:0;z-index:20;display:flex;align-items:center;height:68px;padding:env(safe-area-inset-top,0) max(20px,calc((100vw - 1120px)/2));border-bottom:1px solid var(--border);background:#f4f0e7e6;-webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px)}.brand{display:inline-flex;align-items:center;gap:10px;color:var(--ink);font-size:1.18rem;font-weight:700;text-decoration:none}.brand-mark{display:grid;width:38px;height:38px;place-items:center;border-radius:50%;color:var(--gold);background:var(--ink)}.page-container{width:min(1120px,calc(100% - 40px));margin:0 auto;padding:48px 0 116px}.page-stack{display:grid;gap:34px}.eyebrow{margin-bottom:10px;color:var(--green);font-size:.76rem;font-weight:800;letter-spacing:.15em;text-transform:uppercase}.page-heading{max-width:760px}.page-heading h1,.hero h1{margin-bottom:14px;color:var(--ink);font-size:clamp(2.2rem,7vw,4.8rem);font-weight:600;letter-spacing:-.045em;line-height:1.03}.page-heading h1{font-size:clamp(2rem,5vw,3.5rem)}.page-heading>p:last-child,.hero>p{max-width:680px;color:#53615b;font-size:1.04rem;line-height:1.8}.hero{padding:clamp(28px,7vw,82px);overflow:hidden;border-radius:32px;color:#edf4ef;background:linear-gradient(120deg,#12211bf5,#235c47e6),repeating-linear-gradient(90deg,transparent 0,transparent 68px,rgba(255,255,255,.05) 69px);box-shadow:var(--shadow)}.hero .eyebrow{color:var(--gold)}.hero h1{max-width:780px;color:#fffdf7}.hero>p{color:#ffffffb8}.button-row{display:flex;flex-wrap:wrap;gap:12px;margin-top:24px}.button{display:inline-flex;min-height:48px;align-items:center;justify-content:center;gap:9px;padding:12px 20px;border:1px solid transparent;border-radius:999px;font-weight:750;line-height:1.2;text-decoration:none;cursor:pointer;transition:transform .16s ease,background .16s ease,border-color .16s ease}.button:hover:not(:disabled){transform:translateY(-2px)}.button:disabled{cursor:not-allowed;opacity:.55}.button.primary{color:#12211b;background:var(--gold)}.button.secondary{border-color:var(--border);color:var(--ink);background:#ffffff9e}.hero .button.secondary{border-color:#ffffff3d;color:#fff;background:#ffffff14}.button.compact{min-height:44px;padding:10px 18px;color:#fff;background:var(--green)}.feature-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.feature-card{min-height:260px;padding:28px;border:1px solid var(--border);border-radius:24px;box-shadow:0 12px 30px #1c2f260a}.feature-card.warm{background:var(--gold-soft)}.feature-card.green{background:var(--green-soft)}.feature-card.ink{color:#fff;background:var(--ink)}.feature-number{display:block;margin-bottom:56px;font-weight:800;opacity:.55}.feature-card h2{margin-bottom:10px;font-size:1.45rem}.feature-card p{min-height:48px;color:inherit;line-height:1.55;opacity:.72}.feature-card a{font-weight:800;text-decoration:none}.resume-card{display:flex;align-items:center;justify-content:space-between;gap:20px;padding:22px 26px;border:1px solid var(--border);border-radius:20px;background:var(--paper)}.resume-card h2{margin:0}.bottom-nav{position:fixed;z-index:30;right:50%;bottom:max(14px,env(safe-area-inset-bottom));display:flex;width:min(480px,calc(100% - 28px));padding:7px;transform:translate(50%);border:1px solid rgba(255,255,255,.12);border-radius:22px;background:#12211bf2;box-shadow:0 16px 40px #12211b40;-webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px)}.nav-item{display:flex;min-height:54px;flex:1;flex-direction:column;align-items:center;justify-content:center;gap:2px;border-radius:16px;color:#ffffff8f;font-size:.72rem;font-weight:700;text-decoration:none}.nav-item.active{color:var(--ink);background:var(--gold)}.nav-icon{font-size:1.15rem}.chord-tabs{display:grid;grid-template-columns:repeat(9,minmax(92px,1fr));gap:10px;padding-bottom:8px;overflow-x:auto;scrollbar-width:thin}.chord-tab{display:grid;min-height:82px;place-items:center;gap:3px;padding:12px;border:1px solid var(--border);border-radius:18px;color:var(--ink);background:#fffdf7c2;cursor:pointer}.chord-tab span{color:#6f7b75;font-size:.8rem}.chord-tab.active{border-color:var(--green);color:#fff;background:var(--green)}.chord-tab.active span{color:var(--gold)}.learning-workbench{display:grid;grid-template-columns:minmax(280px,.8fr) minmax(420px,1.2fr);gap:22px}.chord-poster,.control-panel,.settings-section,.question-card,.feedback-card,.summary-card,.loading-card,.empty-state,.result-header,.review-card{border:1px solid var(--border);border-radius:26px;background:var(--paper);box-shadow:var(--shadow)}.chord-poster{container-type:inline-size;position:relative;display:flex;min-height:430px;flex-direction:column;justify-content:center;padding:clamp(28px,5vw,52px);background:linear-gradient(#fffdf7eb,#fffdf7eb),repeating-linear-gradient(0deg,transparent 0,transparent 47px,rgba(18,33,27,.14) 48px)}.chord-play-action{position:absolute;z-index:2;top:clamp(22px,5cqw,34px);right:clamp(22px,5cqw,34px)}.chord-play-button{display:grid;width:52px;height:52px;place-items:center;padding:0 0 0 3px;border:0;border-radius:50%;color:var(--ink);font-size:1.15rem;background:var(--gold);box-shadow:0 10px 24px #12211b29;cursor:pointer}.chord-play-button:hover:not(:disabled){transform:translateY(-2px)}.chord-play-button:disabled{cursor:wait;opacity:.58}.audio-action.icon-only{position:relative}.audio-icon-error{position:absolute;top:calc(100% + 8px);right:0;width:min(230px,70vw);padding:8px 10px;border-radius:10px;color:var(--red);font-size:.74rem;background:var(--red-soft);box-shadow:var(--shadow)}.notation-pair{display:grid;min-width:0;gap:10px;margin:12px 0}.letter-notation{display:block;min-width:0;max-width:100%;color:var(--ink);font-size:clamp(3.2rem,22cqw,7rem);font-weight:500;letter-spacing:-.06em;line-height:.95;overflow-wrap:anywhere}.roman-notation{display:flex;width:fit-content;align-items:baseline;gap:8px;padding:7px 11px;border-radius:999px;color:var(--green);font-size:1.35rem;font-weight:800;background:var(--green-soft)}.roman-notation small{color:#607068;font-family:Inter,Noto Sans SC,Microsoft YaHei,system-ui,sans-serif;font-size:.68rem;font-weight:750;letter-spacing:.08em}.formula{color:var(--green);font-size:1.1rem;font-weight:800}.chord-description{margin:12px 0 0;color:#56635d;line-height:1.7}.note-chips{display:flex;flex-wrap:wrap;gap:8px;margin:12px 0 6px}.note-chips span{display:grid;min-width:46px;height:46px;place-items:center;border-radius:50%;color:#fff;font-weight:800;background:var(--ink)}.muted{color:#78837e;font-size:.88rem}.control-panel{display:grid;align-content:center;padding:clamp(24px,5vw,44px)}.form-grid{display:grid;gap:18px}.form-grid.two{grid-template-columns:repeat(2,minmax(0,1fr))}.field{display:grid;gap:8px}.field>span,.segmented-field legend{color:#4a5952;font-size:.82rem;font-weight:800}.field input,.field select{width:100%;min-height:48px;padding:10px 13px;border:1px solid var(--border);border-radius:13px;color:var(--ink);background:#fff}.segmented-field{margin:24px 0 0;padding:0;border:0}.segmented-field legend{margin-bottom:9px}.segmented{display:grid;grid-template-columns:repeat(3,1fr);gap:6px;padding:5px;border-radius:15px;background:#e9e7df}.segmented button{min-height:44px;padding:8px;border:0;border-radius:11px;color:#59655f;background:transparent;cursor:pointer}.segmented button.active{color:#fff;font-weight:800;background:var(--green)}.audio-action{display:grid;gap:6px}.settings-section{padding:clamp(22px,5vw,42px)}.section-title{display:flex;gap:18px;margin-bottom:28px}.section-title>span{display:grid;width:44px;height:44px;flex:0 0 auto;place-items:center;border-radius:50%;color:var(--ink);font-weight:900;background:var(--gold)}.section-title h2{margin-bottom:5px}.section-title p{margin:0;color:#65716b}.check-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:11px}.check-card{display:flex;min-height:78px;align-items:center;gap:12px;padding:14px;border:1px solid var(--border);border-radius:16px;background:#fff;cursor:pointer}.check-card.selected{border-color:var(--green);background:var(--green-soft)}.check-card input{width:20px;height:20px;accent-color:var(--green)}.check-card span{display:grid;gap:3px}.check-card small{color:#66736c}.toggle-list{display:grid;gap:10px}.toggle-field{display:flex;min-height:74px;align-items:center;justify-content:space-between;gap:20px;padding:14px 16px;border:1px solid var(--border);border-radius:16px;background:#fff}.toggle-field>span:first-child{display:grid;gap:4px}.toggle-field small{color:#67736d;line-height:1.4}.switch{position:relative;width:52px;height:30px;flex:0 0 auto}.switch input{position:absolute;z-index:2;top:0;right:0;bottom:0;left:0;width:100%;height:100%;margin:0;cursor:pointer;opacity:0}.switch>span{position:absolute;top:0;right:0;bottom:0;left:0;border-radius:99px;background:#c9cec9;transition:background .16s ease}.switch>span:after{position:absolute;top:4px;left:4px;width:22px;height:22px;border-radius:50%;background:#fff;box-shadow:0 2px 6px #0000002e;content:"";transition:transform .16s ease}.switch.checked>span{background:var(--green)}.switch.checked>span:after{transform:translate(22px)}.compact-top{margin-top:18px}.start-button{width:min(100%,520px);min-height:58px;justify-self:center;font-size:1.05rem}.error-panel{padding:18px 20px;border:1px solid rgba(166,60,52,.28);border-radius:16px;color:var(--red);background:var(--red-soft)}.error-panel p:last-child{margin-bottom:0}.form-error{margin:5px 0 0;color:var(--red);font-size:.85rem}.training-stage{display:grid;width:min(760px,100%);gap:22px;margin:0 auto}.training-header,.result-header{display:flex;align-items:center;justify-content:space-between;gap:18px}.training-header h1{margin:0;font-size:2rem}.live-score{display:grid;justify-items:end}.live-score strong{color:var(--green);font-size:1.7rem}.live-score span{color:#64716a;font-size:.78rem}.progress-track{height:8px;overflow:hidden;border-radius:999px;background:#d9d8d1}.progress-track span{display:block;height:100%;border-radius:inherit;background:var(--green);transition:width .22s ease}.question-card{display:grid;min-height:330px;place-items:center;align-content:center;padding:34px;text-align:center}.speaker-orbit{display:grid;width:104px;height:104px;margin-bottom:20px;place-items:center;border:1px solid var(--border);border-radius:50%;background:var(--gold-soft);box-shadow:0 0 0 12px #e8b35e1f,0 0 0 24px #e8b35e0f}.speaker-orbit span{color:var(--ink);font-size:2.3rem}.question-card h2{margin-bottom:8px;font-size:1.7rem}.question-card>p{color:#69756f}.question-card.feedback-state{min-height:330px;border-left:7px solid var(--green)}.question-card.feedback-state.feedback-wrong{border-left-color:var(--red)}.feedback-symbol{display:grid;width:68px;height:68px;margin-bottom:18px;place-items:center;border-radius:50%;font-size:2rem;font-weight:900}.feedback-symbol.success{color:var(--green);background:var(--green-soft)}.feedback-symbol.fail{color:var(--red);background:var(--red-soft)}.question-card.feedback-state .eyebrow{margin-bottom:8px}.question-card.feedback-state h2{overflow-wrap:anywhere}.feedback-details{max-width:100%;margin-bottom:18px;line-height:1.65;overflow-wrap:anywhere}.listen-button{margin-top:10px}.answer-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}.answer-option{display:grid;min-height:82px;gap:4px;padding:15px;border:1px solid var(--border);border-radius:17px;color:var(--ink);background:#fff;cursor:pointer}.answer-option span{color:#68746e;font-size:.82rem}.answer-option:hover:not(:disabled){border-color:var(--green);background:var(--green-soft)}.answer-option:disabled{cursor:default;opacity:.68}.answer-option.correct{border-color:var(--green);background:var(--green-soft);opacity:1}.answer-option.wrong{border-color:var(--red);background:var(--red-soft);opacity:1}.feedback-card{padding:26px}.feedback-card.success{border-left:7px solid var(--green)}.feedback-card.fail{border-left:7px solid var(--red)}.feedback-card h2{margin-bottom:8px}.feedback-card>p:not(.eyebrow){color:#5d6963;line-height:1.65}.summary-card,.empty-state{display:grid;width:min(680px,100%);justify-items:center;margin:20px auto;padding:clamp(30px,8vw,70px);text-align:center}.score-ring{display:grid;width:168px;height:168px;margin:14px 0 28px;place-content:center;border:13px solid var(--gold-soft);border-radius:50%}.score-ring strong{font-size:2.5rem}.score-ring span{color:#6a766f;font-size:.78rem}.loading-card{padding:32px;color:#65716b;text-align:center}.empty-state>span{display:grid;width:76px;height:76px;margin-bottom:20px;place-items:center;border-radius:50%;color:var(--green);font-size:2rem;background:var(--green-soft)}.history-list,.review-list{display:grid;gap:14px}.history-card{display:flex;align-items:center;gap:12px;padding:10px 16px 10px 10px;border:1px solid var(--border);border-radius:20px;background:var(--paper)}.history-main{display:flex;min-width:0;flex:1;align-items:center;justify-content:space-between;gap:18px;padding:12px;text-decoration:none}.history-main h2{margin-bottom:5px}.history-main p:last-child{margin:0;color:#66726c}.history-score{display:grid;flex:0 0 auto;justify-items:end}.history-score strong{color:var(--green);font-size:1.65rem}.history-score span{color:#68746e;font-size:.78rem}.text-button{min-height:44px;padding:8px 10px;border:0;background:none;cursor:pointer}.text-button.danger{color:var(--red)}.page-actions{display:flex;align-items:center}.back-link{display:inline-flex;min-height:44px;align-items:center;gap:8px;padding:9px 14px;border:1px solid var(--border);border-radius:999px;color:var(--ink);font-weight:800;text-decoration:none;background:#fffdf7c2}.back-link:hover{border-color:var(--green);color:var(--green)}.result-header{padding:clamp(25px,5vw,42px)}.result-header h1{margin-bottom:7px}.result-header p:last-child{margin:0;color:#66726c}.result-score{display:grid;flex:0 0 auto;justify-items:end}.result-score strong{color:var(--green);font-size:clamp(2.5rem,8vw,4.4rem)}.result-score span{color:#68746e}.review-card{display:flex;gap:18px;padding:22px}.review-index{display:grid;width:42px;height:42px;flex:0 0 auto;place-items:center;border-radius:50%;color:#fff;font-weight:800;background:var(--ink)}.review-content{min-width:0;flex:1}.review-title{display:flex;align-items:flex-start;justify-content:space-between;gap:14px}.review-title h2{margin-bottom:8px;font-size:1.15rem}.review-content p{margin-bottom:6px;color:#5f6b65;line-height:1.5}.status{flex:0 0 auto;padding:5px 9px;border-radius:999px;font-size:.75rem;font-weight:800}.status.correct{color:var(--green);background:var(--green-soft)}.status.wrong{color:var(--red);background:var(--red-soft)}.status.pending{color:#6c746f;background:#ebeae5}@media(max-width:820px){.page-container{width:min(100% - 28px,720px);padding-top:30px}.feature-grid{grid-template-columns:1fr}.feature-card{min-height:220px}.feature-number{margin-bottom:34px}.learning-workbench{grid-template-columns:1fr}.check-grid{grid-template-columns:repeat(2,1fr)}}@media(max-width:560px){.topbar{height:60px;padding-right:16px;padding-left:16px}.page-container{width:min(100% - 20px,520px);padding-top:20px}.hero{border-radius:24px}.hero h1{font-size:2.65rem}.button-row,.button-row .button,.audio-action{width:100%}.button-row .button{flex:1 1 100%}.resume-card{align-items:flex-start}.form-grid.two,.answer-grid,.check-grid{grid-template-columns:1fr}.chord-poster,.control-panel,.settings-section,.question-card,.feedback-card,.summary-card,.result-header{border-radius:21px}.chord-poster{min-height:370px}.chord-play-button{width:48px;height:48px}.letter-notation{font-size:clamp(3rem,21cqw,5rem)}.segmented{grid-template-columns:1fr}.question-card{min-height:300px;padding:28px 18px}.answer-option{min-height:70px}.training-header,.result-header{align-items:flex-start}.result-header{display:grid}.result-score{justify-items:start}.review-card{gap:12px;padding:16px}.review-title{display:grid}.review-title .status{width:fit-content}.history-card{align-items:flex-start}.history-main{display:grid}.history-score{justify-items:start}}@media(prefers-reduced-motion:reduce){*,*:before,*:after{scroll-behavior:auto!important;transition-duration:.01ms!important;animation-duration:.01ms!important;animation-iteration-count:1!important}}
