/* © 2026 Geoffrey Chen. All rights reserved. */
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;font-size:16px;line-height:1.65;-webkit-font-smoothing:antialiased}button,input,select{font:inherit}button,a,input,select{-webkit-tap-highlight-color:transparent}button,a,select{touch-action:manipulation}a{color:inherit;text-decoration:none}button{color:inherit;background:none;border:0;cursor:pointer}button:disabled{cursor:default;opacity:.43}button:focus-visible,a:focus-visible,select:focus-visible,input:focus-visible{outline:3px solid var(--focus);outline-offset:3px}button:not(:disabled):active{transform:translateY(1px)}[hidden]{display:none!important}h1,h2,h3,p{margin:0}.page-shell{max-width:1200px;margin:auto;padding:0 36px}.skip-link{position:fixed;top:-100px;left:12px;background:var(--surface);z-index:100}.skip-link:focus{top:12px}.site-banner{display:block;margin-top:24px;overflow:hidden;border-radius:12px;background:var(--surface)}.site-banner img{display:block;width:100%;height:auto}.site-header{min-height:108px;display:flex;justify-content:space-between;align-items:center;gap:16px;border-bottom:1px solid var(--line)}.brand{display:flex;align-items:center;gap:13px}.brand-icon{height:46px;width:46px;display:grid;place-items:center;background:var(--accent);border-radius:13px;color:var(--accent-ink);flex-shrink:0}.brand-icon svg{height:30px;width:30px;stroke:currentColor;fill:currentColor;stroke-width:1.8;stroke-linecap:round}.brand-icon svg path{fill:none}.brand 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h3{font-size:17px;margin-bottom:21px}.settings-panel>label:not(.check-label){display:flex;align-items:center;justify-content:space-between;font-size:14px;color:var(--muted);margin-top:20px;margin-bottom:7px}.settings-panel select,select#pattern{width:100%;border:1px solid var(--line);border-radius:7px;background:var(--surface);color:var(--ink);font-size:15px;padding:10px;min-height:45px;max-width:100%}.settings-panel input[type="range"]{width:100%;accent-color:var(--accent);height:30px;margin:0}.settings-panel output{font-size:13px;color:var(--ink);font-variant-numeric:tabular-nums}.check-label{display:flex;gap:9px;font-size:14px;margin-top:19px;align-items:flex-start}.check-label input{accent-color:var(--accent);width:18px;height:18px;margin-top:4px;flex-shrink:0}.setting-help{font-size:12px;line-height:1.8;color:var(--muted);margin-top:21px;padding-top:18px;border-top:1px solid 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30px}.storage-warning{padding:12px;background:var(--danger-bg);color:var(--danger);border-radius:8px;margin-top:18px;font-size:14px}footer{padding:24px 0 36px;border-top:1px solid var(--line);display:flex;justify-content:space-between;gap:20px;color:var(--muted);font-size:13px}.footer-note{font-size:11px;display:block;margin-top:4px}.footer-links{display:flex;flex-wrap:wrap;gap:20px;align-items:flex-start}.footer-links a:hover{text-decoration:underline}dialog{width:min(640px,calc(100% - 32px));max-height:85vh;border:1px solid var(--line);background:var(--surface);color:var(--ink);border-radius:15px;padding:25px;box-shadow:0 20px 90px #0003}dialog::backdrop{background:#17251b80}.dialog-head{display:flex;justify-content:space-between;align-items:center;gap:15px;border-bottom:1px solid var(--line);padding-bottom:15px;margin-bottom:18px}.dialog-head h2{font-size:22px}.dialog-text{white-space:pre-line;font-size:15px;line-height:1.9}.theme-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}.theme-option{border:1px solid var(--line);border-radius:9px;background:var(--soft);padding:15px;display:flex;align-items:center;gap:10px;text-align:left;min-height:58px}.theme-option[aria-pressed="true"]{box-shadow:inset 0 0 0 2px var(--accent)}.theme-swatch{width:22px;height:22px;border-radius:50%;border:1px solid #8885}.history-table{width:100%;border-collapse:collapse;font-size:13px}.history-table td,.history-table th{text-align:left;border-bottom:1px solid var(--line);padding:9px 4px}.history-table .correct{color:var(--good)}.history-table .incorrect{color:var(--danger)}.danger-button{color:var(--danger)}html[lang="en"] .brand strong{letter-spacing:-.5px;font-size:23px}html[lang="en"] h1{font-size:38px}
@media(max-width:960px){.series-label{display:none}.workspace-grid{grid-template-columns:minmax(0,1fr) 245px}.settings-panel{padding:25px 18px}.practice-main{padding:27px 25px}.progress-strip{gap:22px}.intro-art{width:200px}h2{font-size:23px}}
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@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}
@media print{.practice-app:after{opacity:.25}.header-actions,.settings-panel,.tabs,.button-row,.next-row,.play-main,.replay-row,.answer-grid,.app-bottom{display:none}.workspace-grid{display:block}.practice-app{box-shadow:none}body{background:white}}

/* Meter-aware training controls */
.meter-guide,.feature-help{font-size:12px;line-height:1.7;color:var(--muted);margin-top:8px}.training-summary{font-size:13px;color:var(--accent);margin:9px 0 4px;line-height:1.8}.training-controls{border:0;border-top:1px solid var(--line);padding:17px 0 0;margin:20px 0 4px;min-width:0}.training-controls legend{font-size:14px;color:var(--ink);padding:0 7px 0 0}.preset-buttons{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin:4px 0 14px}.preset-buttons button{min-height:42px;padding:8px 5px;border:1px solid var(--line);border-radius:7px;background:var(--surface);font-size:12px;line-height:1.5}.preset-buttons button[aria-pressed="true"]{border-color:var(--accent);background:var(--accent-tint);box-shadow:inset 0 0 0 1px var(--accent);color:var(--accent)}.preset-buttons small{display:block;font-size:10px;color:var(--accent)}.feature-options{display:grid;grid-template-columns:1fr 1fr;gap:5px 8px}.feature-options label{display:flex;align-items:center;gap:6px;font-size:13px;min-height:40px;cursor:pointer;line-height:1.45}.feature-options input{accent-color:var(--accent);width:17px;height:17px;margin:0;flex-shrink:0}.training-controls:disabled{opacity:.5}.training-controls:disabled label{cursor:default}.subdivision-line{stroke:var(--line);stroke-width:1;stroke-dasharray:2 3;opacity:.7}.tuplet-label{font-family:inherit;font-size:11px;fill:var(--muted)}.cell-label.small{font-size:11px}.diagram-box{overflow-x:auto}.rhythm-svg{min-width:480px}.history-table td{overflow-wrap:anywhere}html[lang="en"] .feature-options{grid-template-columns:1fr}html[lang="en"] .settings-panel>label[for="tempo"]{align-items:flex-start;gap:6px}html[lang="en"] .settings-panel>label[for="tempo"] span{max-width:130px}
@media(max-width:680px){.settings-panel>label,.settings-panel>select,.settings-panel>input,.settings-panel>.meter-guide,.settings-panel>.training-controls{grid-column:1/-1!important;grid-row:auto!important}.settings-panel .training-controls{margin-top:16px}.preset-buttons button{font-size:14px;min-height:48px}.feature-options label{font-size:15px;min-height:44px}.feature-options,html[lang="en"] .feature-options{grid-template-columns:1fr 1fr}.meter-guide,.feature-help{font-size:13px}.settings-panel>label[for="volume"]{margin-top:16px}.rhythm-svg{min-width:480px}html[lang="en"] .settings-panel>label[for="tempo"] span{max-width:none}}

.visual-label{font-size:12px;color:var(--muted);margin-top:12px}.staff-score{margin-top:7px;border:1px solid var(--line);border-radius:9px;background:var(--surface);padding:6px;overflow-x:auto;min-height:150px}.staff-score svg{display:block;max-width:none}.notation-message{font-size:13px;color:var(--muted);padding:20px}.settings-shortcut{display:inline-block;font-size:12px;color:var(--accent);padding:3px 0;border-bottom:1px solid var(--line);margin-top:3px}.settings-shortcut:hover{border-color:var(--accent)}#training-settings{scroll-margin-top:15px}html{scroll-behavior:smooth}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}

/* Secondary footer notices stay available without interrupting practice. */
.footer-links{align-items:center;font-size:12px}.footer-links .text-button{font-size:12px;padding:0;min-height:44px;color:var(--muted)}.source-strip a:hover,.source-link{text-decoration:underline;text-underline-offset:4px}.source-details{margin:16px 0;padding:14px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}#dialog-body>.dialog-text+p{margin-top:14px}footer{margin-top:24px}