:root{--bg: #fdf8ef;--bg-2: #f6ecd9;--ink: #1f1a14;--ink-2: #4b4234;--muted: #8a7e6a;--line: #e7dcc4;--line-2: #d6c8a8;--primary: #e85d2a;--primary-deep: #b8401a;--accent: #1a4f7a;--accent-2: #f5b800;--success: #2e8b4f;--rose: #d4416d;--paper: #ffffff;--shadow: 0 1px 2px rgba(31,26,20,.06), 0 8px 24px rgba(31,26,20,.08);--shadow-lg: 0 1px 2px rgba(31,26,20,.06), 0 24px 60px rgba(31,26,20,.14);--r-sm: 8px;--r-md: 14px;--r-lg: 20px;--r-xl: 28px;--font-display: "Space Grotesk", Georgia, serif;--font-body: "Inter", system-ui, -apple-system, sans-serif;--font-mono: "JetBrains Mono", ui-monospace, monospace}a.sidebar-item,a.btn,a.tile,a.stat,a.song-row,a.practice-cta,a.topbar-brand{text-decoration:none}a.tile,a.stat,a.song-row,a.topbar-brand{color:inherit}*{box-sizing:border-box}html,body{margin:0;padding:0}body{font-family:var(--font-body);background:var(--bg);color:var(--ink);-webkit-font-smoothing:antialiased;font-size:15px;line-height:1.5}button{font-family:inherit;cursor:pointer}.app{min-height:100vh;display:flex;flex-direction:column}.topbar{display:flex;align-items:center;justify-content:space-between;padding:14px 28px;background:var(--paper);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:50}.topbar-brand{display:flex;align-items:center;gap:12px;font-family:var(--font-display);font-weight:600;font-size:20px;letter-spacing:-.01em}.topbar-brand .mark{width:32px;height:32px;border-radius:50%;background:var(--primary);position:relative;display:grid;place-items:center;color:#fff}.topbar-brand 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.12s ease}.user-menu-header{padding:10px 12px;border-bottom:1px solid var(--line);margin-bottom:6px}.user-menu-name{font-weight:600;font-size:14px;color:var(--ink);word-break:break-word}.user-menu-role{font-size:11px;color:var(--muted);text-transform:uppercase;letter-spacing:.08em;margin-top:2px}.user-menu-item{display:block;width:100%;text-align:left;background:transparent;border:0;padding:10px 12px;border-radius:var(--r-sm);cursor:pointer;font-size:14px;font-family:inherit;color:var(--ink);transition:background .12s ease}.user-menu-item:hover,.user-menu-item:focus-visible{background:var(--bg-2);outline:none}@keyframes user-menu-in{0%{transform:translateY(-4px);opacity:0}to{transform:translateY(0);opacity:1}}.avatar{width:36px;height:36px;border-radius:50%;background:var(--accent);color:#fff;display:grid;place-items:center;font-weight:600;font-size:13px;letter-spacing:.02em}.avatar.sm{width:28px;height:28px;font-size:11px}.avatar.lg{width:56px;height:56px;font-size:18px}.avatar.teacher{background:var(--primary)}.role-pill{font-size:11px;text-transform:uppercase;letter-spacing:.08em;font-weight:600;padding:4px 10px;border-radius:999px;background:var(--bg-2);color:var(--ink-2)}.role-pill.teacher{background:#e85d2a1f;color:var(--primary-deep)}.status-pill{font-size:11px;text-transform:uppercase;letter-spacing:.08em;padding:4px 10px;border-radius:999px;font-weight:600;white-space:nowrap}.status-pill.inactive{background:#9ca3af2e;color:#6b7280;border:1px solid rgba(156,163,175,.3)}.tile.inactive{opacity:.62;background:#00000004}.tile.inactive:hover{opacity:.85}.page{flex:1;display:flex;min-height:0}.page-content{flex:1;padding:32px 40px;max-width:1400px;width:100%;margin:0 auto}.page-hero{display:flex;justify-content:space-between;align-items:flex-end;gap:24px;margin-bottom:28px;padding-bottom:18px;border-bottom:1px solid var(--line)}.page-hero h1{font-family:var(--font-display);font-weight:500;font-size:38px;letter-spacing:-.02em;margin:0 0 4px;line-height:1.1}.page-hero .sub{color:var(--muted);font-size:15px}.eyebrow{font-size:11px;letter-spacing:.12em;text-transform:uppercase;font-weight:600;color:var(--primary);margin-bottom:8px}.sidebar{width:240px;border-right:1px solid var(--line);background:var(--paper);padding:24px 16px;display:flex;flex-direction:column;gap:4px}.sidebar-section{font-size:10px;font-weight:700;text-transform:uppercase;letter-spacing:.1em;color:var(--muted);padding:12px 12px 6px}.sidebar-item{display:flex;align-items:center;gap:10px;padding:9px 12px;border:0;background:transparent;border-radius:10px;font-weight:500;font-size:14px;color:var(--ink-2);text-align:left;width:100%}.sidebar-item:hover{background:var(--bg-2)}.sidebar-item.active{background:var(--ink);color:#fff}.sidebar-item .ico{font-size:16px;line-height:1}.sidebar-item .count{margin-left:auto;font-size:12px;color:var(--muted)}.sidebar-item.active .count{color:#fff9}.card{background:var(--paper);border:1px solid var(--line);border-radius:var(--r-md);padding:20px}.card.elev{box-shadow:var(--shadow)}.tile{background:var(--paper);border:1px solid var(--line);border-radius:var(--r-md);padding:18px;transition:all .15s;position:relative;display:flex;flex-direction:column}.tile:hover{border-color:var(--line-2);transform:translateY(-2px);box-shadow:var(--shadow)}.tile.locked{opacity:.5;background:transparent;border-style:dashed}.tile.locked:hover{transform:none;box-shadow:none}.tile h3{font-family:var(--font-display);font-weight:500;font-size:22px;margin:0;letter-spacing:-.01em}.tile-meta{font-size:12px;color:var(--muted);margin-top:6px}.btn{display:inline-flex;align-items:center;gap:8px;padding:10px 18px;border-radius:999px;border:1px solid transparent;font-weight:600;font-size:14px;background:var(--ink);color:var(--bg);transition:all .15s}.btn:hover{background:#000}.btn.primary{background:var(--primary);color:#fff}.btn.primary:hover{background:var(--primary-deep)}.btn.ghost{background:transparent;color:var(--ink-2);border-color:var(--line)}.btn.ghost:hover{background:var(--bg-2);color:var(--ink)}.btn.sm{padding:6px 12px;font-size:13px}.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-bottom:24px}.stat{background:var(--paper);border:1px solid var(--line);border-radius:var(--r-md);padding:20px;display:flex;flex-direction:column;gap:4px;position:relative;overflow:hidden}.stat:before{content:"";position:absolute;top:0;left:0;width:4px;height:100%;background:var(--c, var(--primary))}.stat-num{font-family:var(--font-display);font-weight:500;font-size:44px;line-height:1;letter-spacing:-.02em;color:var(--c, var(--primary));display:flex;align-items:baseline;gap:4px}.stat-num .total{font-size:18px;color:var(--muted);font-weight:400}.stat-label{font-size:13px;color:var(--ink-2);font-weight:500;margin-top:6px}.stat-bar{height:4px;background:var(--bg-2);border-radius:999px;margin-top:10px;overflow:hidden}.stat-bar>i{display:block;height:100%;background:var(--c, var(--primary));border-radius:999px}.chord{display:inline-flex;flex-direction:column;align-items:center;gap:6px}.chord-name{font-family:var(--font-display);font-weight:600;font-size:22px;letter-spacing:.02em}.chord svg{display:block}.rhythm{display:flex;align-items:center;justify-content:space-around;padding:18px 22px;background:var(--bg-2);border-radius:var(--r-md);position:relative;min-height:110px}.rhythm-step{display:flex;flex-direction:column;align-items:center;gap:8px;flex:1;position:relative}.rhythm-arrow{font-size:36px;line-height:1;color:var(--ink-2);transition:all .15s;font-weight:300}.rhythm-arrow.active{color:var(--primary);transform:scale(1.4)}.rhythm-arrow.muted{opacity:.25}.rhythm-beat{font-family:var(--font-mono);font-size:11px;color:var(--muted);font-weight:500}.rhythm-beat.accent{color:var(--primary);font-weight:700}.tempo-slider{margin-top:12px}.tempo-readout{display:flex;align-items:baseline;gap:6px;margin-bottom:6px}.tempo-readout-value{font-family:var(--font-display);font-size:28px;font-weight:600;line-height:1;color:var(--ink);font-variant-numeric:tabular-nums}.tempo-readout-unit{font-size:11px;font-weight:600;letter-spacing:.8px;text-transform:uppercase;color:var(--muted)}.tempo-readout-base{font-size:11px;color:var(--muted);margin-left:4px}.tempo-row{display:flex;align-items:center;gap:10px}.tempo-range{flex:1;-moz-appearance:none;appearance:none;-webkit-appearance:none;background:transparent;height:28px;cursor:pointer;margin:0;padding:0}.tempo-range::-webkit-slider-runnable-track{height:4px;background:var(--line-2);border-radius:999px}.tempo-range::-moz-range-track{height:4px;background:var(--line-2);border-radius:999px;border:none}.tempo-range::-webkit-slider-thumb{-moz-appearance:none;appearance:none;-webkit-appearance:none;width:18px;height:18px;border-radius:50%;background:var(--primary);border:2px solid var(--paper);box-shadow:0 1px 4px #1f1a1433;margin-top:-7px;cursor:grab;transition:transform .12s ease}.tempo-range::-webkit-slider-thumb:active{transform:scale(1.15);cursor:grabbing}.tempo-range::-moz-range-thumb{width:18px;height:18px;border-radius:50%;background:var(--primary);border:2px solid var(--paper);box-shadow:0 1px 4px #1f1a1433;cursor:grab}.tempo-range:focus-visible{outline:none}.tempo-range:focus-visible::-webkit-slider-thumb{box-shadow:0 0 0 4px #e85d2a40}.tempo-range:focus-visible::-moz-range-thumb{box-shadow:0 0 0 4px #e85d2a40}.tempo-btn{display:inline-flex;align-items:center;justify-content:center;width:32px;height:32px;border-radius:50%;border:1px solid var(--line-2);background:var(--paper);color:var(--ink);font-size:18px;font-weight:600;cursor:pointer;-webkit-user-select:none;user-select:none;transition:background .12s ease,transform .12s ease;flex-shrink:0}.tempo-btn:hover:not(:disabled){background:var(--bg-2)}.tempo-btn:active:not(:disabled){transform:scale(.94)}.tempo-btn:disabled{opacity:.4;cursor:not-allowed}.tempo-reset{display:inline-flex;align-items:center;justify-content:center;width:30px;height:30px;border-radius:50%;border:1.5px solid var(--primary);background:transparent;color:var(--primary);font-size:16px;line-height:1;cursor:pointer;flex-shrink:0;align-self:center;transition:background .12s ease,color .12s ease}.tempo-reset:hover{background:var(--primary);color:var(--paper)}.tempo-value{font-variant-numeric:tabular-nums;font-weight:600;color:var(--ink)}.song-list{display:flex;flex-direction:column;gap:8px}.song-row{display:flex;align-items:center;gap:14px;padding:14px 18px;background:var(--paper);border:1px solid var(--line);border-radius:var(--r-md);cursor:pointer;transition:all .15s}.song-row:hover{border-color:var(--primary);transform:translate(4px)}.song-row.open{border-color:var(--primary);background:linear-gradient(180deg,var(--paper),rgba(232,93,42,.03))}.song-row .num{font-family:var(--font-display);font-weight:500;font-size:24px;color:var(--muted);width:36px;text-align:center}.song-row .info{flex:1}.song-row .info h3{font-family:var(--font-display);font-weight:500;font-size:20px;margin:0;letter-spacing:-.01em}.song-row .info .artist{color:var(--muted);font-size:13px;margin-top:2px}.song-row .toggle{width:32px;height:32px;display:grid;place-items:center;border-radius:50%;background:var(--bg-2);font-size:14px;color:var(--ink);transition:transform .2s}.song-row.open .toggle{background:var(--primary);color:#fff;transform:rotate(180deg)}.song-body{margin-top:-4px;background:var(--paper);border:1px solid var(--primary);border-top:0;border-radius:0 0 var(--r-md) var(--r-md);padding:24px 32px}.lyrics-wrap{margin-top:18px}.lyrics{font-family:var(--font-mono);font-size:15px;line-height:2.4;color:var(--ink)}.lyrics-line{display:block;margin-bottom:8px;white-space:pre-wrap;word-break:break-word}.lyrics-line.empty{padding-top:0;height:10px;line-height:1;margin-bottom:0}.lyric-chunk{position:relative;display:inline-block;white-space:pre;vertical-align:baseline;padding-top:22px}.chord-tag{position:absolute;top:0;left:0;background:#e85d2a24;color:var(--primary-deep);padding:1px 7px;border-radius:5px;font-family:var(--font-display);font-size:13px;font-weight:600;cursor:pointer;transition:all .15s;white-space:nowrap;border:1px solid rgba(232,93,42,.25);line-height:1.4}.chord-tag:hover{background:#e85d2a38;border-color:var(--primary);transform:translateY(-1px)}.lyrics-line-group{display:block}.lyrics-line-group+.lyrics-line-group:has(.rhythm-row){border-top:1px dashed var(--line-2);padding-top:14px;margin-top:8px}.rhythm-row{display:flex;gap:8px;flex-wrap:wrap;margin-top:18px;margin-bottom:8px;padding:0}.lyrics-line-group:first-child .rhythm-row{margin-top:4px}.rhythm-row+.lyrics-line{padding-top:30px}.inline-rhythm-panel{background:var(--bg-2);border:1px solid var(--line-2);border-radius:var(--r-md);padding:14px;margin:6px 0 14px;box-shadow:0 4px 12px #1f1a140f}.inline-rhythm-panel+.lyrics-line{padding-top:36px}.rhythm-tag{display:inline-block;background:#1a4f7a1f;color:var(--accent);padding:3px 10px;border-radius:6px;font-family:var(--font-display);font-size:12px;font-weight:600;cursor:pointer;white-space:nowrap;border:1px solid rgba(26,79,122,.25);line-height:1.4;transition:all .15s}.rhythm-tag:hover{background:#1a4f7a38}.rhythm-tag.active{background:var(--accent);color:#fff;border-color:var(--accent)}.rhythm-display-sticky+.lyrics-wrap .lyrics-line-group:first-child .lyrics-line{padding-top:30px}.rhythm-display-sticky{position:sticky;top:12px;background:var(--bg-2);border:1px solid var(--line-2);border-radius:var(--r-md);padding:14px;margin-bottom:18px;z-index:5;box-shadow:0 4px 12px #1f1a140f}.chord-pop{position:absolute;background:var(--paper);border:1px solid var(--line-2);border-radius:var(--r-md);box-shadow:var(--shadow-lg);padding:14px 22px 14px 14px;z-index:100}.chord-pop-close{position:absolute;top:4px;right:4px;width:22px;height:22px;padding:0;border:none;background:transparent;color:var(--muted);font-size:18px;line-height:1;cursor:pointer;display:inline-flex;align-items:center;justify-content:center;border-radius:50%;transition:background-color .15s,color .15s}.chord-pop-close:hover{background:var(--bg-2);color:var(--ink)}.badge{display:inline-flex;align-items:center;gap:5px;padding:3px 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.15s}.stat.clickable:hover{transform:translateY(-2px);box-shadow:var(--shadow)}@media(max-width:1100px){.grid-4{grid-template-columns:repeat(3,1fr)}.page-content{padding:28px}}@media(max-width:900px){.topbar{padding:12px 16px}.hamburger{display:flex}.hide-sm{display:none!important}.brand-text{font-size:17px}.sidebar-wrap{display:block;position:fixed;top:0;left:0;bottom:0;width:260px;z-index:90;transform:translate(-100%);transition:transform .25s ease;box-shadow:8px 0 24px #00000014}.sidebar-wrap.open{transform:translate(0)}.sidebar-wrap .sidebar{width:100%;height:100%;border-right:1px solid var(--line)}.sidebar-backdrop{display:block;position:fixed;top:0;right:0;bottom:0;left:0;background:#1f1a1466;z-index:80}.page-content{padding:24px 20px}.page-hero{flex-direction:column;align-items:flex-start;gap:12px}.page-hero h1{font-size:30px}.grid-4{grid-template-columns:repeat(2,1fr)}.grid-3{grid-template-columns:1fr 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10px}.rhythm-arrow{font-size:28px}.check{padding:10px;gap:8px}.tabs{overflow-x:auto}.tab{padding:10px 14px;white-space:nowrap}.btn{padding:9px 14px;font-size:13px}.btn.sm{padding:6px 10px;font-size:12px}.row.between{gap:8px}.login-roles{grid-template-columns:1fr}}.practice-rhythm-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:12px}.practice-pick{background:var(--paper);border:2px solid var(--border);border-radius:var(--r-lg);padding:14px;cursor:pointer;transition:all .15s ease;text-align:left;font-family:inherit;color:inherit}.practice-pick:hover{border-color:var(--ink-3);transform:translateY(-1px)}.practice-pick.on{border-color:var(--primary);background:#e85d2a0d;box-shadow:0 0 0 3px #e85d2a1f}.practice-pick.on.rhythm{border-color:var(--primary)}.practice-rhythm-mini{display:flex;gap:4px;flex-wrap:wrap;font-family:var(--font-mono);font-size:18px;color:var(--ink-2)}.practice-rhythm-mini .mini-arrow{width:22px;text-align:center}.practice-rhythm-mini 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#e85d2a5c}.practice-cta-bg{position:absolute;top:0;right:0;bottom:0;left:0;pointer-events:none;opacity:.18;font-family:var(--font-display)}.cta-note{position:absolute;font-size:90px;line-height:1;color:#fff}.cta-note.n1{top:-16px;left:8%;transform:rotate(-12deg)}.cta-note.n2{top:20%;right:14%;font-size:64px;transform:rotate(18deg)}.cta-note.n3{bottom:-22px;left:32%;font-size:110px;transform:rotate(-6deg)}.cta-note.n4{top:30%;right:38%;font-size:48px;transform:rotate(12deg)}.practice-cta-content{position:relative;display:flex;align-items:center;justify-content:space-between;gap:20px;padding:28px 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16px}.practice-rhythm-panel{padding:14px}}.toast-stack{position:fixed;bottom:24px;right:24px;display:flex;flex-direction:column;gap:8px;z-index:1000;pointer-events:none}.toast{background:var(--ink);color:#fff;padding:12px 18px;border-radius:var(--r-md);box-shadow:var(--shadow-lg);font-weight:500;font-size:14px;pointer-events:auto;animation:toast-in .25s ease;min-width:240px;max-width:360px}.toast-success{background:var(--success)}.toast-error{background:var(--rose)}@keyframes toast-in{0%{transform:translate(110%);opacity:0}to{transform:translate(0);opacity:1}}@media(max-width:600px){.toast-stack{left:12px;right:12px;bottom:12px}.toast{min-width:0;max-width:none}}.audio-unlock-banner{display:flex;align-items:center;gap:14px;width:100%;padding:12px 20px;border:0;border-bottom:1px solid rgba(255,255,255,.15);background:linear-gradient(135deg,var(--primary) 0%,var(--primary-deep) 100%);color:#fff;font-family:inherit;text-align:left;cursor:pointer;transition:filter .15s ease;animation:audio-unlock-in .3s ease}.audio-unlock-banner:hover,.audio-unlock-banner:active{filter:brightness(1.08)}.audio-unlock-icon{font-size:22px;line-height:1}.audio-unlock-text{display:flex;flex-direction:column;flex:1;min-width:0;line-height:1.25}.audio-unlock-text strong{font-size:14px;font-weight:600;letter-spacing:.01em}.audio-unlock-hint{font-size:12px;opacity:.88;font-weight:400}.audio-unlock-cta{font-size:13px;font-weight:600;background:#ffffff2e;padding:6px 14px;border-radius:999px;letter-spacing:.02em;white-space:nowrap}@keyframes audio-unlock-in{0%{transform:translateY(-100%);opacity:0}to{transform:translateY(0);opacity:1}}