:root{color-scheme:dark;--bg: #0b0b0d;--panel: #16161a;--line: #2a2a31;--accent: #7aa2ff}*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}[hidden]{display:none!important}html,body{margin:0;height:100%}body{font:15px/1.4 -apple-system,system-ui,sans-serif;background:var(--bg);color:#e8e8ea;-webkit-text-size-adjust:100%}#app{display:grid;grid-template-columns:1fr 300px;grid-template-rows:auto 1fr;grid-template-areas:"bar bar" "stage panel";height:100dvh}#app:has(#panel[hidden]){grid-template-columns:1fr 0}.bar{grid-area:bar;display:flex;align-items:center;justify-content:center;flex-wrap:wrap;gap:10px 18px;padding:10px 16px;padding-top:max(10px,env(safe-area-inset-top));border-bottom:1px solid var(--line)}.brand{font-weight:600;letter-spacing:.02em;display:inline-flex;align-items:center;gap:8px}.info-btn{width:22px;height:22px;padding:0;border-radius:50%;border:1px solid var(--line);background:#202028;color:#b8b8c0;font:italic 600 13px/1 Georgia,serif;cursor:pointer}#infoDlg,#helpDlg{background:var(--panel);color:#e8e8ea;border:1px solid var(--line);border-radius:12px;padding:18px 20px;max-width:min(520px,90vw)}#infoDlg::backdrop,#helpDlg::backdrop{background:#0000008c}#infoDlg h2,#helpDlg h2{margin:0 0 10px;font-size:16px}#infoDlg ol,#infoDlg ul,#helpDlg ol,#helpDlg ul{margin:0 0 14px;padding-left:20px}#infoDlg ul{list-style:none;padding-left:2px}#infoDlg li strong{color:#e8e8ea;font-variant-numeric:tabular-nums}.info-ver{margin:-6px 0 10px;font-size:12px;color:#80808a}#infoDlg li,#helpDlg li{margin:8px 0;font-size:13px;line-height:1.45}#infoDlg a,#helpDlg a{color:var(--accent);text-decoration:none}#infoDlg a:active,#helpDlg a:active{text-decoration:underline}#infoDlg small,#helpDlg small{color:#80808a}#infoDlg button,#helpDlg button{width:auto;padding:8px 16px}.open-btn{background:var(--accent);color:#07101f;font-weight:600;padding:8px 14px;border-radius:8px;cursor:pointer}#stage{grid-area:stage;position:relative;display:grid;place-items:center;overflow:hidden;padding:12px}#view{position:absolute;inset:12px;margin:auto;max-width:calc(100% - 24px);max-height:calc(100% - 24px);object-fit:contain;border-radius:6px;touch-action:none;-webkit-user-select:none;user-select:none;-webkit-touch-callout:none}#histWrap{position:absolute;top:20px;right:20px;z-index:6;padding:6px;border-radius:8px;background:#0a0a0e80;border:1px solid rgba(120,120,135,.35);box-shadow:0 2px 12px #00000080;backdrop-filter:blur(6px);-webkit-backdrop-filter:blur(6px);pointer-events:none}#histogram{display:block;width:200px;height:75px;opacity:.92}.bar-btn[aria-pressed=true]{background:var(--accent);color:#07101f;font-weight:600;border-color:var(--accent)}@media (max-width: 760px){#histWrap{top:12px;right:12px;padding:4px}#histogram{width:150px;height:58px}}#hint{color:#9a9aa2;text-align:center;max-width:40ch;margin:0 auto}#welcome{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);text-align:center;padding:22px 26px;background:#0e0e12f0;border:1px solid var(--line);border-radius:14px;z-index:5;max-width:min(620px,94%);max-height:92%;overflow-y:auto}.welcome-close{position:absolute;top:8px;right:8px;width:30px;height:30px;padding:0;border-radius:50%}.welcome-open{display:inline-block;margin:14px auto 4px;font-size:16px;padding:10px 22px}.bar-actions{display:inline-flex;align-items:center;gap:10px}.bar-btn{width:auto;padding:8px 14px}.lesson-show{position:absolute;left:20px;top:20px;width:38px;height:38px;padding:0;border-radius:50%;font:600 17px/1 -apple-system,system-ui,sans-serif;background:#0e0e12e6;z-index:10}.ex-title{color:#9a9aa2;margin:20px 0 12px;font-size:14px}.ex-list{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}.ex{width:160px;background:var(--panel);border:1px solid var(--line);border-radius:10px;padding:8px;cursor:pointer;color:inherit}.ex img{width:100%;border-radius:6px;display:block}.ex span{display:block;margin-top:7px;font-size:13px;color:#d8d8de;line-height:1.35}.ex small{color:#80808a}#lesson{position:absolute;left:20px;top:20px;max-width:280px;background:#0e0e12e6;border:1px solid var(--line);border-radius:12px;padding:14px 16px;z-index:10}#lesson h3{margin:0 0 8px;font-size:14px}#lesson ol{margin:0 0 10px;padding-left:18px;font-size:13px;color:#c9c9d1}#lesson li{margin:6px 0;line-height:1.4}#lesson button{width:auto;padding:6px 14px}#panel{grid-area:panel;background:var(--panel);border-left:1px solid var(--line);padding:14px;overflow-y:auto}fieldset{border:1px solid var(--line);border-radius:8px;margin:0 0 14px}legend{padding:0 6px;color:#c7c7cf;margin:0 auto;text-align:center}legend small{color:#80808a;font-weight:400}label{display:block;margin:10px 0;font-size:13px;color:#b8b8c0;text-align:center}fieldset>small{display:block;text-align:center;margin:6px 0}input[type=range]{width:100%;accent-color:var(--accent)}select,button{width:100%;background:#202028;color:inherit;border:1px solid var(--line);border-radius:6px;padding:8px}button{cursor:pointer}#busy{position:fixed;inset:0;background:#0000008c;display:grid;place-items:center;z-index:20}.busy-card{background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:22px 28px;text-align:center;min-width:220px}.busy-card p{margin:12px 0 0;color:#d8d8de}.spinner{width:28px;height:28px;margin:0 auto;border:3px solid var(--line);border-top-color:var(--accent);border-radius:50%;animation:spin .9s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}#busyActions{display:flex;gap:8px;margin-top:16px}#busyActions button{flex:1}#busyActions .primary{background:var(--accent);color:#07101f;font-weight:600;border-color:var(--accent)}.coffee{color:var(--accent);text-decoration:none;font-size:13px}.coffee-row{font-size:13px;color:#b8b8c0}.coffee-row a{margin-left:6px}.toggle[aria-pressed=true]{background:var(--accent);color:#07101f;font-weight:600;border-color:var(--accent)}.look-row{display:flex;flex-wrap:wrap;gap:6px}.look-row button{flex:1;min-width:30%;padding:7px 4px 5px;font-size:13px;display:flex;flex-direction:column;align-items:center;gap:2px}.look-row button.active{background:var(--accent);color:#07101f;border-color:var(--accent);font-weight:600}.look-sub{font-size:9px;color:#80808a;min-height:11px;font-weight:400}.look-row button.active .look-sub{color:#07101f}@media (max-width: 760px){#app{grid-template-columns:1fr;grid-template-areas:"bar" "stage" "panel";grid-template-rows:auto 1fr auto}#panel{border-left:none;border-top:1px solid var(--line);max-height:45dvh}}#helpDlg{max-width:min(640px,92vw);max-height:82vh;overflow-y:auto}.help-body{font-size:13px;color:#c9c9d1;line-height:1.5}.help-body h3{margin:14px 0 6px;font-size:13px;color:#e8e8ea}.help-body p{margin:6px 0}.badge{font-size:9px;background:#262635;border:1px solid var(--line);border-radius:4px;padding:1px 4px;color:#9fb3e8;vertical-align:1px;white-space:nowrap}.scroll-cue{position:sticky;display:flex;justify-content:center;height:0;overflow:visible;z-index:6;pointer-events:none}.scroll-cue span{display:inline-block;background:#23232c;border:1px solid var(--line);border-radius:999px;padding:4px 0;width:44px;text-align:center;font-size:12px;color:var(--accent);box-shadow:0 2px 10px #0009;white-space:nowrap}.scroll-cue.up{top:4px}.scroll-cue.down{bottom:10px}.scroll-cue.down span{transform:translateY(-100%)}.look-sub{display:flex;gap:3px;align-items:center}.seg{border:1px solid var(--line);border-radius:3px;padding:0 4px;font-size:8px;line-height:12px;color:#8a8a94;background:transparent}.look-row button.active .seg{border-color:#07101f59;color:#07101fa6}.look-row button.active .seg.on{background:#07101f;color:#cfe0ff;border-color:#07101f;font-weight:600}.band-title{text-align:center;margin:12px 0 2px;font-size:13px;font-weight:600;color:#c7c7cf}.band-title small{color:#80808a;font-weight:400}#pcReset{margin-top:8px}.welcome-div{border:none;border-top:1px solid var(--line);margin:20px 8px 4px}#toneSvg{width:100%;aspect-ratio:1 / 1;height:auto;background:#101014;border:1px solid var(--line);border-radius:6px;touch-action:none;display:block;overflow:visible;margin:8px 2px}.tone-grid{stroke:#22222a;stroke-width:.6}.tone-diag{stroke:#2c2c36;stroke-width:.8;stroke-dasharray:3 3}.tone-path{stroke:var(--accent);stroke-width:1.6;fill:none;vector-effect:non-scaling-stroke}.tone-dot{fill:#e8e8ea;stroke:var(--accent);stroke-width:1.4;cursor:ns-resize}.band{border:1px solid var(--line);border-radius:6px;padding:2px 8px 6px;margin:8px 0}#panel legend.collapsible{cursor:pointer;-webkit-user-select:none;user-select:none}#panel legend.collapsible:after{content:"  ▾";font-size:20px;color:var(--accent);vertical-align:-3px;line-height:0}#panel fieldset.collapsed legend.collapsible:after{content:"  ▸"}#panel fieldset.collapsed>:not(legend){display:none}.lesson-next{font-size:12px;color:#9a9aa2;margin:0 0 10px;line-height:1.45;border-top:1px solid var(--line);padding-top:8px}.lesson-next strong{color:#c9c9d1}