:root{color-scheme:dark;--bg:#0d1117;--card:#141b24;--border:#28313c;--text:#ebeff5;--muted:#8e9aab;--cyan:#79ead1;--amber:#f4bd69;--mono:ui-monospace,SFMono-Regular,Consolas,monospace;font-family:Inter,-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;background:var(--bg);color:var(--text)}
*{box-sizing:border-box}html,body{width:100%;height:100%;overflow:hidden;overscroll-behavior:none}body{margin:0;background:radial-gradient(ellipse at 10% 0%,#15252966,transparent 45%),var(--bg);font-size:14px}button,input,select{font:inherit}button,select,input[type=range]{cursor:pointer}html,body,dialog,.catalog-results,.help-popover,button,a,select,input{touch-action:pan-x pan-y}input[type=range]{touch-action:pan-y}button{border:0;color:inherit}button:disabled{cursor:not-allowed;opacity:.5}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible{outline:2px solid var(--cyan);outline-offset:2px}button:hover{filter:brightness(1.15)}button:active{transform:translateY(1px)}a{color:var(--cyan)}[hidden]{display:none!important}audio{display:none}
/* One bounded viewport. Only dialogs scroll; every flexible view may shrink. */
.app-shell{width:100%;max-width:1800px;height:100vh;height:100svh;height:100dvh;margin:auto;padding:12px 20px;padding-top:max(10px,env(safe-area-inset-top));padding-right:max(12px,env(safe-area-inset-right));padding-bottom:max(10px,env(safe-area-inset-bottom));padding-left:max(12px,env(safe-area-inset-left));overflow:hidden}
main{height:100%;min-height:0;min-width:0;display:flex;flex-direction:column;gap:10px;overflow:hidden}.song-bar{display:flex;flex:0 0 54px;min-height:0;align-items:center;gap:12px}.cover{width:44px;height:44px;border-radius:8px;border:1px solid #3b414a;object-fit:cover;flex:none}.song-copy{min-width:0;flex:1}.song-copy h1{font-size:19px;line-height:1.3;margin:0 0 3px;font-weight:600;overflow:hidden;white-space:nowrap;text-overflow:ellipsis}.song-copy p{font-size:11px;line-height:1.4;margin:0;color:var(--muted);white-space:nowrap;text-overflow:ellipsis;overflow:hidden}.song-status:not(:empty)::before{content:" · ";color:var(--muted)}.song-status:empty{display:none}.difficulty{display:flex;flex:none;align-items:center;gap:7px;padding:7px 9px;border:1px solid #35534a;border-radius:7px;background:#1a2d2b;color:var(--cyan);font:10px var(--mono)}.difficulty strong{font-size:18px;font-weight:500}.header-actions{display:flex;gap:7px;flex:none}.browse-songs,.settings-button,.settings-close{height:40px;padding:0 13px;border:1px solid #34424f;border-radius:7px;background:#17232c;color:#d7e5ef;font-size:12px}.settings-button{background:#202a36}
.workspace{display:grid;flex:1 1 0;min-height:0;min-width:0;grid-template-columns:minmax(0,.95fr) minmax(0,1.05fr);grid-template-rows:minmax(0,1fr);gap:10px;overflow:hidden}.view-card{background:var(--card);border:1px solid var(--border);border-radius:10px;overflow:hidden;min-width:0;min-height:0}.board-card,.timeline-card{display:grid;grid-template-rows:34px minmax(0,1fr) 24px}.card-heading{padding:0 13px;display:flex;align-items:center;justify-content:space-between;gap:8px;min-width:0}h2{margin:0;font-size:12px;font-weight:550;letter-spacing:.3px}.live-label{display:flex;align-items:center;gap:6px;white-space:nowrap;font-size:10px;color:var(--muted)}.live-label b{font-weight:400}.live-label span{height:5px;width:5px;background:#778392;border-radius:50%}.live-label.playing{color:var(--cyan)}.live-label.playing span{background:var(--cyan);box-shadow:0 0 7px #79ead166}.quiet-label{color:#7e8b9e;font-size:10px}.board-wrap{padding:0 8px;min-height:0;min-width:0;overflow:hidden}.board-stage{position:relative;width:100%;height:100%}.board-wrap canvas,.timeline-wrap canvas{width:100%;height:100%;display:block}.timeline-wrap{min-height:0;min-width:0;position:relative;margin:0 8px;overflow:hidden;background:#10151c;border-top:1px solid #202934;border-bottom:1px solid #202934}.timeline-wrap canvas{cursor:crosshair;touch-action:pan-y}.board-footer,.timeline-footer{padding:0 13px;display:flex;align-items:center;justify-content:flex-end;color:#91a0b2;font-size:10px;min-width:0}.board-footer span,.timeline-footer span{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.board-footer{justify-content:center}
/* Audio transport stays visible below both views, with a native seek range. */
.transport{flex:none;padding:8px 12px;background:#161d26}.progress-heading{height:17px;display:flex;align-items:center;justify-content:space-between;gap:10px;font:10px var(--mono);color:var(--muted)}.time-readout{display:flex;align-items:center;gap:7px;white-space:nowrap}.time-readout strong{color:var(--text);font-weight:500;font-size:12px}#note-progress{min-width:0;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}/* Separate square cells echo the supplied reference; the native range owns all input. */
.overview-wrap{height:48px;min-height:48px;min-width:0;position:relative;margin:2px 0 5px}
.overview-wrap canvas{width:100%;height:100%;display:block;pointer-events:none}
.overview-wrap input{appearance:none;-webkit-appearance:none;position:absolute;inset:0;width:100%;height:48px;min-width:0;margin:0;padding:0;border:0;border-radius:6px;background:transparent;cursor:grab}
.overview-wrap input:active{cursor:grabbing}
.overview-wrap input:focus-visible{outline:2px solid #e7fffa;outline-offset:0}
.overview-wrap input:disabled{cursor:not-allowed;opacity:.4}
.overview-wrap input::-webkit-slider-runnable-track{height:48px;background:transparent;border:0}
.overview-wrap input::-webkit-slider-thumb{appearance:none;-webkit-appearance:none;box-sizing:border-box;width:44px;height:44px;margin-top:2px;border:6px solid transparent;border-radius:13px;background:linear-gradient(#174853,#174853) center/2px 14px no-repeat padding-box,linear-gradient(#174853,#174853) calc(50% - 5px) center/2px 14px no-repeat padding-box,linear-gradient(#174853,#174853) calc(50% + 5px) center/2px 14px no-repeat padding-box,linear-gradient(#f1fffc,#9af0df) padding-box;filter:drop-shadow(0 1px 2px #000b);cursor:grab}
.overview-wrap input::-moz-range-track{height:48px;background:transparent;border:0}
.overview-wrap input::-moz-range-progress{background:transparent}
.overview-wrap input::-moz-range-thumb{box-sizing:border-box;width:44px;height:44px;border:6px solid transparent;border-radius:13px;background:linear-gradient(#174853,#174853) center/2px 14px no-repeat padding-box,linear-gradient(#174853,#174853) calc(50% - 5px) center/2px 14px no-repeat padding-box,linear-gradient(#174853,#174853) calc(50% + 5px) center/2px 14px no-repeat padding-box,linear-gradient(#f1fffc,#9af0df) padding-box;filter:drop-shadow(0 1px 2px #000b);cursor:grab}
.overview-wrap input:active::-webkit-slider-thumb{cursor:grabbing;filter:drop-shadow(0 0 4px #79ead1aa)}
.overview-wrap input:active::-moz-range-thumb{cursor:grabbing;filter:drop-shadow(0 0 4px #79ead1aa)}
.seek-hint{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap;border:0}
.controls-row{display:flex;align-items:center;justify-content:center;gap:8px}.skip-button{height:40px;min-width:54px;padding:0 10px;border:1px solid #333e4b;border-radius:6px;background:#1c2530;font:12px var(--mono);color:#bdcbd8}.play-button{height:40px;min-width:102px;display:flex;gap:7px;align-items:center;justify-content:center;background:var(--cyan);color:#142b28;border-radius:6px;font-size:12px;font-weight:650}.play-button svg{width:18px;height:18px;fill:currentColor;flex:none}.speed-control{display:flex;align-items:center;gap:7px;color:var(--muted);font-size:11px;margin-left:8px}.speed-control select{height:40px;min-width:80px;padding:0 7px;font:12px var(--mono)}select{border:1px solid #333e4b;border-radius:6px;background:#1c2530;color:#d2dae5}
/* Tall screens split the remaining height; wider screens split the width. */
@media(max-aspect-ratio:4/5){.workspace{grid-template-columns:minmax(0,1fr);grid-template-rows:minmax(0,1fr) minmax(0,1fr)}}
@media(max-width:600px){.app-shell{padding-top:max(6px,env(safe-area-inset-top));padding-bottom:max(6px,env(safe-area-inset-bottom));padding-left:max(8px,env(safe-area-inset-left));padding-right:max(8px,env(safe-area-inset-right))}main,.workspace{gap:7px}.song-bar{flex-basis:48px;gap:7px}.cover{width:36px;height:36px;border-radius:6px}.song-copy h1{font-size:15px}.song-copy p{font-size:9px}.difficulty{gap:4px;padding:6px;font-size:8px}.difficulty strong{font-size:15px}.header-actions{gap:5px}.browse-songs,.settings-button{padding:0 10px;font-size:11px}.card-heading{padding:0 10px}.board-card,.timeline-card{grid-template-rows:28px minmax(0,1fr) 20px}.board-footer,.timeline-footer{font-size:9px;padding:0 10px}.board-wrap{padding:0 5px}.timeline-wrap{margin:0 5px}.transport{padding:6px 9px}.controls-row{gap:6px}.skip-button{min-width:48px;padding:0 6px}.play-button{min-width:94px}.speed-control{margin-left:3px;gap:5px}.speed-control select{min-width:74px;padding:0 4px}.progress-heading{font-size:9px}}
@media(max-width:380px){.cover{display:none}.song-bar{gap:5px}.song-copy h1{font-size:14px}.difficulty{gap:3px;padding:5px}.difficulty strong{font-size:14px}.header-actions{gap:4px}.browse-songs,.settings-button{padding:0 8px}.speed-control>span{display:none}.skip-button{min-width:44px}.play-button{min-width:88px}.live-label{font-size:9px}.quiet-label{font-size:9px}}
/* A short landscape keeps transport on one row without sacrificing seek. */
@media(max-height:500px) and (min-width:540px) and (min-aspect-ratio:1/1){.app-shell{padding-top:max(4px,env(safe-area-inset-top));padding-bottom:max(4px,env(safe-area-inset-bottom))}main,.workspace{gap:6px}.song-bar{flex-basis:40px;gap:8px}.cover{width:32px;height:32px}.song-copy h1{font-size:15px;margin-bottom:0}.song-copy p{font-size:9px}.browse-songs,.settings-button{height:36px}.difficulty{padding:5px 8px}.board-card,.timeline-card{grid-template-rows:27px minmax(0,1fr) 18px}.card-heading,.board-footer,.timeline-footer{padding:0 9px}.board-footer,.timeline-footer{font-size:9px}.transport{display:grid;grid-template-columns:minmax(0,1fr) auto;grid-template-rows:17px 48px;column-gap:15px;padding:6px 10px}.progress-heading{grid-column:1;grid-row:1}.overview-wrap{grid-column:1;grid-row:2;margin:0}.controls-row{grid-column:2;grid-row:1/span 2;gap:6px}.play-button{min-width:88px}.skip-button{min-width:44px}.speed-control{margin-left:0}.speed-control>span{display:none}.speed-control select{min-width:74px}.time-readout{gap:4px}}
/* Settings are a native modal; the close action stays outside its scrolling body. */
.settings-dialog{left:env(safe-area-inset-left);right:env(safe-area-inset-right);top:env(safe-area-inset-top);bottom:env(safe-area-inset-bottom);width:min(540px,calc(100vw - 24px - env(safe-area-inset-left) - env(safe-area-inset-right)));max-width:none;max-height:calc(100vh - 24px);max-height:calc(100dvh - 24px - env(safe-area-inset-top) - env(safe-area-inset-bottom));margin:auto;padding:0;border:1px solid #3b4b5a;border-radius:13px;background:#141b24;color:var(--text);box-shadow:0 24px 100px #000b;overflow:hidden}.settings-dialog:not([open]){display:none}.settings-dialog::backdrop{background:#050910ce;backdrop-filter:blur(5px)}.settings-panel{display:flex;flex-direction:column;max-height:inherit;min-height:0}.settings-heading{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:12px 18px;border-bottom:1px solid var(--border);flex:none}.settings-heading h2{font-size:18px}.settings-close{height:36px}.settings-body{min-height:0;overflow-y:auto;overscroll-behavior:contain;padding:0 18px 10px;scrollbar-color:#475967 #121922;scroll-padding:10px}.settings-group{padding:12px 0;border-bottom:1px solid #29323d}.settings-group:last-child{border-bottom:0;padding-bottom:0}.setting-row{min-height:44px;display:flex;align-items:center;justify-content:space-between;gap:12px;font-size:12px;color:#bfccd9}.setting-row h3{margin:0;font-size:12px;font-weight:500}.setting-row select{height:36px;max-width:190px;font-size:11px;padding:0 7px}.setting-row input[type=range]{width:clamp(100px,40vw,220px);min-width:0;height:36px;accent-color:var(--cyan);margin:0}.scroll-speed-control input{margin-left:auto!important;max-width:190px}.scroll-speed-control output{min-width:24px;color:#d2dae5;font:12px var(--mono);text-align:right}.number-toggle,.hit-toggle{display:flex;align-items:center;gap:7px;white-space:nowrap;cursor:pointer}.number-toggle input,.hit-toggle input{width:17px;height:17px;margin:0;accent-color:var(--cyan)}#hit-status{font-size:11px;color:#91a0b2}.offset-controls{display:flex;align-items:center;gap:5px}.adjust-button{border:1px solid #2b3744;background:#18212b;border-radius:6px;height:36px;width:36px;color:#bfcbd8;font-size:18px}.offset-field{height:36px;border:1px solid #2b3744;border-radius:6px;display:flex;align-items:center;gap:3px;background:#111922;padding:0 7px}.offset-field input{appearance:textfield;-moz-appearance:textfield;background:transparent;border:none;color:var(--text);width:43px;text-align:right;font:12px var(--mono);padding:6px 0}.offset-field input::-webkit-inner-spin-button,.offset-field input::-webkit-outer-spin-button{-webkit-appearance:none;margin:0}.offset-field span{font:10px var(--mono);color:#7b8b9e}.text-button{background:transparent;color:#a9bacb;padding:8px 10px;font-size:11px;min-height:36px}.song-details{color:#93a3b5;font-size:11px;gap:8px;flex-wrap:wrap}.song-details strong{font:12px var(--mono);color:#d2dae5}.about-row{font-size:10px;color:#8294a8}.heading-with-help{display:flex;align-items:center;gap:5px;min-width:0}.help-button{display:inline-flex;align-items:center;justify-content:center;flex:0 0 28px;width:28px;height:28px;padding:0;background:transparent;color:#8492a4;font:500 11px var(--mono);border-radius:50%;position:relative}.help-button::before{content:"";position:absolute;inset:6px;border:1px solid #536172;border-radius:50%}.help-button:hover,.help-button[aria-expanded=true]{color:var(--cyan);background:#243630}.help-button[aria-expanded=true]::before{border-color:var(--cyan)}.help-popover{position:fixed;z-index:50;margin:0;padding:17px 19px;background:#1a232d;color:#b4c2d1;border:1px solid #3b4b5a;border-radius:10px;box-shadow:0 12px 36px #0008;overflow:auto;overscroll-behavior:contain;font-size:12px;line-height:1.8;max-width:calc(100vw - 24px);max-height:calc(100dvh - 24px)}.help-popover[hidden]{display:none}.help-popover:focus{outline:none}.help-popover:focus-visible{outline:1px solid #657b86;outline-offset:2px}.help-popover h3{margin:0 0 8px;color:#e0e8ee;font-size:13px;font-weight:600}.help-popover p{margin:8px 0}.help-popover p:last-child{margin-bottom:0}.help-popover a{overflow-wrap:anywhere}
@media(max-width:420px){.settings-dialog{width:calc(100vw - 16px - env(safe-area-inset-left) - env(safe-area-inset-right))}.settings-heading{padding:10px 12px}.settings-body{padding:0 12px 10px}.setting-row{gap:7px;font-size:11px}.setting-row h3{font-size:11px}.setting-row select{max-width:170px;font-size:10px}.offset-row{align-items:flex-start;flex-direction:column;gap:3px;padding:4px 0}.offset-controls{align-self:flex-end}.setting-row input[type=range]{max-width:160px}.help-popover{padding:14px 16px}}
@media(pointer:coarse){.help-button{width:36px;height:36px;flex-basis:36px}.help-button::before{inset:10px}.heading-with-help{gap:2px}}
/* A real DOM/CSS overlay shares the canvas content box, including letterboxing. */
.board-numbers{position:absolute;inset:0;pointer-events:none;overflow:hidden;user-select:none}.marker-number{position:absolute;transform:translate(0,-100%);font-family:var(--mono);font-weight:800;line-height:1;color:#fff;text-align:left;text-shadow:0 1px 2px #000,1px 0 2px #000,-1px 0 2px #000;-webkit-text-stroke:1.1px #10151c;paint-order:stroke fill}.board-numbers[hidden],.marker-number[hidden]{display:none}
/* Loading/error messages take bounded room without creating a scrolling page. */
.error-box{flex:none;border:1px solid #b46f5b;color:#ffd5c3;background:#482b2466;padding:8px 12px;border-radius:7px;font-size:11px;line-height:1.5;overflow-wrap:anywhere;max-height:68px;overflow:hidden;display:-webkit-box;-webkit-box-orient:vertical;-webkit-line-clamp:3}.load-progress{flex:none;display:grid;grid-template-columns:minmax(0,1fr) auto;gap:4px 12px;align-items:center;padding:7px 12px;border:1px solid #344f4a;border-radius:7px;background:#162725}.load-copy{display:flex;align-items:center;justify-content:space-between;gap:8px;min-width:0;font-size:11px}.load-copy #load-detail{color:#94aba5;font:10px var(--mono);white-space:nowrap}.load-progress progress{width:100%;height:6px;accent-color:var(--cyan)}.load-progress .text-button{grid-column:2;grid-row:1/span 2;padding:4px}.load-progress progress::-webkit-progress-bar{background:#283c39;border-radius:4px}.load-progress progress::-webkit-progress-value{background:var(--cyan);border-radius:4px}.load-progress progress::-moz-progress-bar{background:var(--cyan);border-radius:4px}@media(max-width:520px){.load-copy{align-items:flex-start;flex-direction:column;gap:2px}.load-progress{padding:6px 9px}}@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important}}

.audio-clock-status{display:block;margin-top:4px;color:#f4bd69;font-size:11px;line-height:1.3}.audio-clock-status[hidden]{display:none}