:root{color:#17201c;background:#f6f7f4;font-family:Inter,SF Pro Display,PingFang SC,Microsoft YaHei,system-ui,-apple-system,BlinkMacSystemFont,sans-serif;font-synthesis:none;letter-spacing:0;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;--border: #d9ded6;--muted: #65726a;--panel: #ffffff;--ink: #17201c;--wash: #eef3ef;--coral: #d95663;--green: #347c58;--teal: #177e87;--amber: #c2842f}*{box-sizing:border-box}body{min-width:320px;margin:0}button,input{font:inherit}button{cursor:pointer}.appShell{min-height:100vh;padding:18px;background:linear-gradient(90deg,rgba(23,32,28,.05) 1px,transparent 1px),linear-gradient(0deg,rgba(23,32,28,.04) 1px,transparent 1px),#f6f7f4;background-size:34px 34px}.topbar{display:flex;align-items:center;justify-content:space-between;gap:16px;max-width:1440px;margin:0 auto 18px}.brandBlock{display:flex;align-items:center;min-width:0;gap:12px}.brandMark{display:inline-flex;align-items:center;justify-content:center;width:44px;height:44px;flex:0 0 auto;color:#fff;background:#17201c;border-radius:8px}.brandBlock h1,.panel h2{margin:0;color:var(--ink);letter-spacing:0}.brandBlock h1{font-size:clamp(1.35rem,3vw,2rem);line-height:1.05}.brandBlock p,.eyebrow,.metric span,.lessonRow span,.songRow span,.sessionRow span,.controlLabel{color:var(--muted)}.brandBlock p,.eyebrow{margin:4px 0 0;font-size:.84rem}.topbarMeta{display:inline-flex;align-items:center;justify-content:center;min-height:36px;padding:0 12px;gap:8px;white-space:nowrap;color:#253028;border:1px solid var(--border);background:#ffffffc7;border-radius:8px}.statusDot{width:9px;height:9px;border-radius:999px;background:var(--amber)}.statusDot.live{background:var(--green)}.statusDot.local{background:var(--coral)}.workspaceGrid{display:grid;grid-template-columns:minmax(0,1.55fr) minmax(320px,.75fr);gap:18px;max-width:1440px;margin:0 auto}.mainLane,.sideLane{display:grid;gap:18px;min-width:0}.sideLane{align-content:start}.panel{min-width:0;border:1px solid var(--border);background:#ffffffeb;border-radius:8px;box-shadow:0 18px 50px #25302814}.stagePanel{padding:22px}.controlPanel,.chordPanel,.listPanel{padding:18px}.panelHeader{display:flex;align-items:flex-start;justify-content:space-between;gap:14px;margin-bottom:18px}.panelHeader.compact{align-items:center;margin-bottom:14px}.panel h2{font-size:clamp(1.2rem,2vw,1.8rem);line-height:1.12}.eyebrow{text-transform:uppercase}.noteSummary{display:grid;place-items:center;width:82px;height:82px;flex:0 0 auto;color:#fff;background:var(--note-color);border:2px solid rgba(23,32,28,.18);border-radius:8px}.noteSummary span{font-size:.92rem}.noteSummary strong{font-size:2rem;line-height:1}.staffMap{position:relative;height:clamp(210px,28vw,330px);overflow:hidden;border:1px solid var(--border);background:linear-gradient(135deg,rgba(52,124,88,.08),transparent 38%),linear-gradient(315deg,rgba(217,86,99,.08),transparent 42%),#fbfcfa;border-radius:8px}.staffLines{position:absolute;top:22%;right:6%;bottom:22%;left:6%;display:grid;grid-template-rows:repeat(5,1fr);align-items:center}.staffLines span{height:2px;background:#17201c47}.staffNote{position:absolute;display:grid;place-items:center;width:44px;height:44px;padding:0;color:#fff;border:2px solid rgba(23,32,28,.18);background:var(--note-color);border-radius:999px;transform:translate(-50%,-50%);transition:transform .16s ease,box-shadow .16s ease}.staffNote.active{transform:translate(-50%,-50%) scale(1.18);box-shadow:0 14px 28px #17201c38}.stageStats{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:1px;overflow:hidden;margin:18px 0;border:1px solid var(--border);background:var(--border);border-radius:8px}.metric{min-width:0;padding:14px;background:#fff}.metric span,.metric strong{display:block}.metric strong{margin-top:5px;overflow-wrap:anywhere;color:var(--ink);font-size:1.04rem}.piano{display:grid;grid-template-columns:repeat(7,minmax(0,1fr));min-height:188px;gap:8px}.pianoKey{position:relative;display:flex;flex-direction:column;justify-content:flex-end;min-width:0;min-height:188px;padding:14px 8px;overflow:hidden;color:var(--ink);border:1px solid #cbd1ca;background:linear-gradient(180deg,#fff,#edf1ed);border-radius:8px;transition:transform .14s ease,border-color .14s ease,background .14s ease}.pianoKey.active{color:#fff;border-color:#17201c3d;background:var(--note-color);transform:translateY(-4px)}.pianoKey span,.pianoKey strong{position:relative;z-index:1}.pianoKey strong{margin-top:6px;font-size:clamp(1rem,2vw,1.6rem);overflow-wrap:anywhere}.blackKey{position:absolute;top:0;right:-15%;width:48%;height:46%;background:#1e2421;border-radius:0 0 6px 6px;box-shadow:0 8px 18px #17201c40}.controlGrid{display:grid;grid-template-columns:minmax(0,1.2fr) minmax(0,1fr) minmax(0,.9fr);gap:18px;align-items:end}.controlGroup{min-width:0}.controlLabel{display:inline-flex;align-items:center;gap:8px;margin-bottom:10px;font-size:.88rem}.segmented{display:grid;grid-template-columns:repeat(7,minmax(0,1fr));gap:6px}.modeTabs{grid-template-columns:repeat(3,minmax(0,1fr))}.segmented button,.iconButton,.primaryButton,.secondaryButton{display:inline-flex;align-items:center;justify-content:center;min-height:40px;padding:0 10px;color:#26332b;border:1px solid var(--border);background:#fff;border-radius:8px}.segmented button{min-width:0;overflow-wrap:anywhere}.segmented button.active{color:#fff;border-color:#17201c;background:#17201c}.tempoControl{display:grid;grid-template-columns:minmax(0,1fr) 52px;gap:10px;align-items:center}.tempoControl input{width:100%;accent-color:var(--green)}.tempoControl output{display:inline-flex;align-items:center;justify-content:center;min-height:40px;border:1px solid var(--border);background:#fff;border-radius:8px}.actionsRow{display:flex;flex-wrap:wrap;gap:10px;margin-top:18px}.primaryButton,.secondaryButton{gap:8px;min-width:138px}.primaryButton{color:#fff;border-color:#17201c;background:#17201c}.secondaryButton{color:#17201c}.iconButton{width:40px;padding:0}.chordWheel{position:relative;height:288px;border:1px solid var(--border);background:radial-gradient(circle,rgba(23,32,28,.08) 0 1px,transparent 1px),linear-gradient(180deg,#fbfcfa,#eef3ef);background-size:18px 18px,auto;border-radius:8px}.wheelCenter,.chordNode{position:absolute;display:grid;place-items:center;text-align:center;transform:translate(-50%,-50%)}.wheelCenter{top:50%;left:50%;width:96px;height:96px;border:1px solid var(--border);background:#fff;border-radius:999px}.wheelCenter span,.chordNode span{color:var(--muted);font-size:.78rem}.wheelCenter strong{font-size:1.4rem}.chordNode{width:74px;height:58px;padding:6px;border:1px solid rgba(23,32,28,.16);background:#fff;border-radius:8px}.chordNode.active{color:#fff;border-color:var(--chord-color);background:var(--chord-color);box-shadow:0 14px 30px #17201c2e}.chordNode.active span{color:#ffffffd1}.rows{display:grid}.lessonRow,.songRow,.sessionRow{display:grid;gap:10px;align-items:center;min-width:0;padding:13px 0;border-top:1px solid var(--border)}.lessonRow:first-child,.songRow:first-child,.sessionRow:first-child{border-top:0}.lessonRow{grid-template-columns:minmax(0,1fr) 92px}.lessonRow strong,.lessonRow span,.songRow strong,.songRow span{display:block;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.progressRail{height:8px;overflow:hidden;background:#e4e9e3;border-radius:999px}.progressRail span{display:block;height:100%;background:linear-gradient(90deg,var(--green),var(--teal))}.songRow{grid-template-columns:minmax(0,1fr) auto}.songMeta,.timeBadge{display:inline-flex;align-items:center;justify-content:center;min-height:30px;padding:0 10px;color:#253028;border:1px solid var(--border);background:var(--wash);border-radius:8px;white-space:nowrap}.sessionRow{grid-template-columns:minmax(54px,.7fr) minmax(0,1fr) auto}@media (max-width: 1080px){.workspaceGrid{grid-template-columns:1fr}.sideLane{grid-template-columns:repeat(2,minmax(0,1fr))}}@media (max-width: 760px){.appShell{padding:12px}.topbar{align-items:stretch;flex-direction:column}.topbarMeta{justify-content:flex-start}.stagePanel,.controlPanel,.chordPanel,.listPanel{padding:14px}.panelHeader{align-items:center}.noteSummary{width:64px;height:64px}.stageStats,.controlGrid,.sideLane{grid-template-columns:1fr}.piano{min-height:136px;gap:5px}.pianoKey{min-height:136px;padding:10px 4px}.pianoKey strong{font-size:.96rem}.segmented{grid-template-columns:repeat(4,minmax(0,1fr))}.modeTabs{grid-template-columns:1fr}.chordWheel{height:260px}}@media (max-width: 430px){.staffNote{width:34px;height:34px;font-size:.82rem}.piano{overflow-x:visible;grid-template-columns:repeat(7,minmax(0,1fr));gap:4px}.pianoKey{padding:8px 2px}.lessonRow,.songRow,.sessionRow{grid-template-columns:1fr}.songMeta,.timeBadge{justify-self:start}}