:root{
  --ink:#171717;
  --muted:#737373;
  --line:#d9d9d4;
  --paper:#f6f5f0;
  --panel:#fffefb;
  --soft:#ecebe5;
  --accent:#176b57;
  --accent-dark:#0e4d3e;
  --danger:#aa3f38;
  --shadow:0 18px 50px rgba(20,20,18,.12);
  --rail:220px;
}
*{box-sizing:border-box}
html,body{margin:0;width:100%;height:100%;overflow:hidden;background:var(--paper);color:var(--ink);font-family:"Noto Sans SC","PingFang SC","Microsoft YaHei",sans-serif}
button,input,textarea{font:inherit}
button{color:inherit}
button:focus-visible,input:focus-visible,textarea:focus-visible{outline:3px solid rgba(23,107,87,.28);outline-offset:2px}
.is-hidden{display:none!important}
.app-header{
  height:62px;border-bottom:1px solid var(--line);background:rgba(255,255,252,.94);
  display:flex;align-items:center;gap:16px;padding:0 18px;position:relative;z-index:50;
}
.brand{display:flex;align-items:center;gap:11px;min-width:270px}
.brand-mark{width:34px;height:34px;border-radius:9px;background:#111;display:grid;place-items:center;color:#fff;font:700 13px/1 Georgia,serif;letter-spacing:-1px}
.brand-copy b{display:block;font-size:15px;letter-spacing:.6px}.brand-copy span{display:block;color:var(--muted);font-size:10px;margin-top:2px;letter-spacing:.8px}
.header-center{flex:1;min-width:0}.header-center h1{font-size:18px;margin:0}.header-center p{font-size:11px;color:var(--muted);margin:3px 0 0;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.header-actions{display:flex;align-items:center;gap:8px}
.identity-chip{max-width:170px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;padding:8px 11px;border:1px solid var(--line);border-radius:999px;background:#fff;font-size:11px;color:#555}
.revision-guide{
  min-height:54px;padding:7px 18px;border-bottom:1px solid #c9ad63;background:#fff7d8;
  display:flex;align-items:center;justify-content:center;gap:18px;position:relative;z-index:45;
}
.revision-guide>div{display:grid;gap:2px;min-width:0}
.revision-guide b{font-size:12px;color:#513c08}
.revision-guide span{font-size:10px;line-height:1.45;color:#756224}
.revision-guide .btn{min-height:36px;flex:none}
body.revision-mode .studio-shell{height:calc(100dvh - 116px)}
body.revision-mode #newAttemptButton,
body.revision-mode #panelNewAttemptButton{display:none!important}
.btn,.icon-btn{
  min-height:40px;border:1px solid var(--line);background:#fff;border-radius:10px;padding:0 13px;cursor:pointer;
  display:inline-flex;align-items:center;justify-content:center;gap:6px;text-decoration:none;font-size:12px;font-weight:650;
}
.btn:hover,.icon-btn:hover{border-color:#a9a99f;background:#fafaf7}
.btn.primary{background:var(--accent);border-color:var(--accent);color:#fff}.btn.primary:hover{background:var(--accent-dark)}
.btn.dark{background:#171717;border-color:#171717;color:#fff}
.btn.danger{border-color:#d8aaa6;color:var(--danger)}
.btn:disabled,.icon-btn:disabled{opacity:.38;cursor:not-allowed}
.icon-btn{width:40px;padding:0;font-size:17px}
.studio-shell{height:calc(100dvh - 62px);display:grid;grid-template-columns:var(--rail) minmax(0,1fr);overflow:hidden}
.studio-rail{border-right:1px solid var(--line);background:#fff;display:flex;flex-direction:column;min-width:0;min-height:0}
.rail-head{padding:17px 14px 12px;border-bottom:1px solid var(--line)}
.rail-kicker{font-size:9px;letter-spacing:1.7px;color:var(--accent);font-weight:800}.rail-head h2{font-size:18px;margin:4px 0 5px}.rail-head p{font-size:11px;color:var(--muted);line-height:1.55;margin:0}
.round-nav{padding:10px;display:flex;flex-direction:column;gap:7px;overflow:auto;min-height:0;scrollbar-width:none}
.round-nav::-webkit-scrollbar{display:none}
.round-btn{
  width:100%;border:1px solid transparent;background:transparent;border-radius:12px;padding:11px;text-align:left;cursor:pointer;
  display:grid;grid-template-columns:32px minmax(0,1fr) auto;align-items:center;gap:9px;
}
.round-btn:hover{background:#f5f5f0}.round-btn.active{border-color:#9fc5ba;background:#edf6f2}
.round-no{width:30px;height:30px;border-radius:50%;display:grid;place-items:center;background:#ecece7;font-weight:800;font-size:11px}
.round-btn.active .round-no{background:var(--accent);color:#fff}
.round-copy{min-width:0}.round-copy b{display:block;font-size:12px}.round-copy span{display:block;font-size:10px;color:var(--muted);margin-top:3px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.round-state{font-size:9px;padding:3px 6px;border-radius:999px;background:#efefeb;color:#777}.round-state.done{background:#e4f1ec;color:var(--accent-dark)}
.rail-foot{margin-top:auto;border-top:1px solid var(--line);padding:10px;display:grid;gap:7px}.rail-foot .btn{width:100%}
.studio-main{min-width:0;min-height:0;display:grid;grid-template-rows:auto minmax(0,1fr);overflow:hidden}
.player-bar{
  min-height:72px;border-bottom:1px solid var(--line);background:#fbfbf8;padding:9px 14px;display:flex;align-items:center;gap:12px;
}
.play-button{width:50px;height:50px;border-radius:50%;border:0;background:#171717;color:#fff;font-size:18px;cursor:pointer;flex:none}
.play-button.playing{background:var(--accent)}
.track-meta{width:205px;min-width:140px}.track-meta b{display:block;font-size:13px}.track-meta span{display:block;font-size:10px;color:var(--muted);margin-top:4px}
.timeline{flex:1;min-width:120px}
.timeline-row{display:flex;justify-content:space-between;gap:10px;font:11px/1.2 ui-monospace,SFMono-Regular,Consolas,monospace;color:#666;margin-bottom:7px}
.progress-track{height:8px;border-radius:999px;background:#deded8;overflow:hidden;cursor:pointer}.progress-fill{height:100%;width:0;background:var(--accent)}
.player-actions{display:flex;gap:7px;align-items:center;flex-wrap:wrap;justify-content:flex-end}
.marker-btn{border-color:#b6aca1}.marker-btn.marked{animation:markerPulse .28s ease}
@keyframes markerPulse{50%{transform:scale(.94);background:#171717;color:#fff}}
.work-area{min-height:0;min-width:0;display:grid;grid-template-columns:minmax(0,1fr) 256px;overflow:hidden}
.board-column{min-width:0;min-height:0;padding:10px;display:grid;grid-template-rows:minmax(0,1fr) auto;gap:8px;overflow:hidden}
.canvas-wrap{
  min-width:0;min-height:0;position:relative;display:flex;align-items:center;justify-content:center;
  border:1px solid var(--line);border-radius:16px;background:#deded8;overflow:hidden;
}
.canvas-stage{
  position:relative;width:min(100%,calc((100dvh - 226px) * 1.4142));aspect-ratio:1.4142;background:#fff;
  box-shadow:0 12px 34px rgba(0,0,0,.15);overflow:hidden;touch-action:none;cursor:crosshair;user-select:none;
}
.canvas-stage canvas{position:absolute;inset:0;width:100%;height:100%;touch-action:none}
#paintCanvas{z-index:1}#previewCanvas{z-index:2}
.canvas-message{position:absolute;inset:0;z-index:4;display:grid;place-items:center;pointer-events:none;text-align:center;padding:30px}
.canvas-message>div{background:rgba(255,255,252,.9);border:1px solid var(--line);border-radius:14px;padding:16px 20px;box-shadow:0 8px 25px rgba(0,0,0,.08)}
.canvas-message b{display:block;font-size:16px}.canvas-message span{display:block;font-size:11px;color:var(--muted);line-height:1.65;margin-top:5px}
.canvas-badge{position:absolute;left:10px;top:10px;z-index:5;background:rgba(255,255,255,.87);border:1px solid rgba(0,0,0,.12);border-radius:999px;padding:5px 9px;font-size:9px;pointer-events:none}
.tool-dock{
  min-height:58px;border:1px solid var(--line);border-radius:14px;background:#fff;padding:7px 9px;display:flex;align-items:center;gap:9px;overflow-x:auto;
  scrollbar-width:none;
}
.tool-dock::-webkit-scrollbar{display:none}
.tool-group{display:flex;gap:5px;padding-right:8px;border-right:1px solid var(--line);align-items:center;flex:none}
.tool-group:last-child{border-right:0;padding-right:0}
.tool-button{
  min-width:42px;height:42px;border:1px solid transparent;border-radius:9px;background:#f3f3ef;cursor:pointer;padding:0 9px;font-size:11px;font-weight:700;
}
.tool-button:hover{border-color:#bbb}.tool-button.active{background:#171717;color:#fff;border-color:#171717}
.swatch{width:39px;height:39px;border-radius:50%;border:2px solid #c7c7c0;cursor:pointer;position:relative}.swatch.black{background:#000}.swatch.white{background:#fff}.swatch.active::after{content:"";position:absolute;inset:-5px;border:2px solid var(--accent);border-radius:50%}
.slider-wrap{display:grid;grid-template-columns:auto 88px 34px;align-items:center;gap:5px;font-size:10px;color:#666;white-space:nowrap}.slider-wrap input{accent-color:var(--accent);width:88px}.slider-value{text-align:right;color:#222;font-weight:700}
.brush-popover{
  position:absolute;z-index:20;left:12px;bottom:74px;width:min(420px,calc(100% - 24px));background:#fff;border:1px solid var(--line);
  border-radius:14px;box-shadow:var(--shadow);padding:12px;
}
.brush-popover header{display:flex;justify-content:space-between;align-items:center;margin-bottom:9px}.brush-popover h3{font-size:13px;margin:0}
.brush-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:7px}
.brush-option{border:1px solid var(--line);background:#fafaf7;border-radius:10px;padding:9px 5px;cursor:pointer;text-align:center;font-size:10px}.brush-option b{display:block;font-size:17px;margin-bottom:4px}.brush-option.active{border-color:var(--accent);background:#eaf4f0;color:var(--accent-dark)}
.side-panel{border-left:1px solid var(--line);background:#fff;display:grid;grid-template-rows:auto minmax(0,1fr) auto;min-height:0}
.panel-tabs{display:grid;grid-template-columns:1fr 1fr;border-bottom:1px solid var(--line)}.panel-tab{height:44px;border:0;background:#f7f7f3;cursor:pointer;font-size:11px;font-weight:750}.panel-tab.active{background:#fff;color:var(--accent);box-shadow:inset 0 -2px var(--accent)}
.panel-scroll{min-height:0;overflow:auto;padding:10px}
.panel-section{display:none}.panel-section.active{display:block}
.panel-title{display:flex;justify-content:space-between;align-items:center;margin-bottom:9px}.panel-title h3{font-size:13px;margin:0}.panel-title span{font-size:10px;color:var(--muted)}
.layer-actions{display:grid;grid-template-columns:repeat(4,1fr);gap:5px;margin-bottom:9px}.layer-actions .icon-btn{width:100%;height:36px;min-height:36px;font-size:14px}
.layer-list{display:flex;flex-direction:column-reverse;gap:6px}
.layer-row{border:1px solid var(--line);border-radius:10px;padding:8px;background:#fafaf7;display:grid;grid-template-columns:30px minmax(0,1fr) 30px;gap:6px;align-items:center;cursor:pointer}
.layer-row.active{border-color:#8db8ac;background:#eaf4f0}.layer-row button{width:28px;height:28px;border:0;background:transparent;cursor:pointer;border-radius:7px}.layer-row button:hover{background:rgba(0,0,0,.06)}
.layer-copy{min-width:0}.layer-name{font-size:11px;font-weight:700;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.layer-sub{font-size:9px;color:var(--muted);margin-top:2px}
.layer-opacity{margin-top:10px;padding-top:10px;border-top:1px solid var(--line)}
.layer-opacity input{width:100%;accent-color:var(--accent)}
.version-list{display:grid;gap:8px}.version-card{border:1px solid var(--line);border-radius:11px;overflow:hidden;background:#fafaf7}.version-card.selected{border-color:var(--accent);box-shadow:inset 0 0 0 1px var(--accent)}
.version-card.revision-base{border-color:#c9992a;background:#fffaf0;box-shadow:inset 0 0 0 1px rgba(201,153,42,.22)}
.version-card.revision-base.selected{border-color:#9b6e09;box-shadow:inset 0 0 0 2px rgba(155,110,9,.22)}
.panel-version-actions{display:grid;grid-template-columns:1fr 1fr;gap:6px;margin-bottom:9px}.panel-version-actions .btn{min-height:34px;padding:0 7px;font-size:9px}.panel-version-actions .btn:last-child{grid-column:1/-1}
.version-thumb{aspect-ratio:1.4142;background:#e4e4df;display:grid;place-items:center;overflow:hidden}.version-thumb img{width:100%;height:100%;object-fit:cover}.version-thumb span{font-size:10px;color:var(--muted)}
.version-info{padding:8px}.version-info b{font-size:11px}.version-info p{font-size:9px;color:var(--muted);margin:4px 0 7px}.version-actions{display:flex;gap:5px}.version-actions button{flex:1;min-height:31px;padding:0 7px;font-size:9px}
.reflection{border-top:1px solid var(--line);padding:10px;background:#fbfbf8}
.reflection h3{font-size:12px;margin:0 0 8px}.reflection-grid{display:grid;grid-template-columns:1fr 1fr;gap:6px}.reflection label{font-size:9px;color:#666}.reflection input,.reflection textarea{width:100%;margin-top:3px;border:1px solid var(--line);background:#fff;border-radius:8px;padding:7px;font-size:10px}.reflection textarea{height:58px;resize:none;line-height:1.5}.reflection .wide{grid-column:1/-1}
.reflection-label{display:flex;align-items:baseline;justify-content:space-between;gap:6px;min-width:0;color:#4f4f49}
.reflection-label>span{flex:0 0 auto;font-weight:700;color:#363630}
.reflection-label .rubric-hint{min-width:0;color:#99958b;font-size:8px;font-weight:400;line-height:1.35;text-align:right}
.reflection-status{font-size:9px;color:var(--muted);margin:7px 0 0}.reflection-status.ready{color:var(--accent)}
.modal-backdrop{position:fixed;inset:0;z-index:100;background:rgba(20,20,18,.56);display:grid;place-items:center;padding:14px}
.modal{width:min(720px,96vw);max-height:92vh;overflow:auto;background:#fff;border-radius:18px;box-shadow:0 30px 90px rgba(0,0,0,.28)}
.modal-head{display:flex;justify-content:space-between;gap:12px;padding:18px;border-bottom:1px solid var(--line)}.modal-head h2{font-size:17px;margin:0}.modal-head p{font-size:11px;color:var(--muted);line-height:1.6;margin:5px 0 0}
.modal-body{padding:16px}.audio-slots{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.audio-slot{border:1px solid var(--line);border-radius:12px;padding:12px}.audio-slot header{display:flex;justify-content:space-between;gap:8px;align-items:center}.audio-slot b{font-size:12px}.audio-slot span{font-size:9px;color:var(--muted)}.audio-slot p{font-size:10px;color:#666;line-height:1.55;margin:7px 0}.audio-slot-actions{display:flex;gap:6px}.audio-slot-actions .btn{min-height:34px;font-size:10px;flex:1}
.modal-note{font-size:10px;color:#666;line-height:1.7;background:#f3f3ee;border-radius:10px;padding:10px;margin:12px 0 0}
.modal-foot{display:flex;justify-content:flex-end;gap:8px;padding:14px 16px;border-top:1px solid var(--line)}
.toast{position:fixed;z-index:150;left:50%;bottom:20px;transform:translate(-50%,18px);opacity:0;pointer-events:none;background:#171717;color:#fff;padding:10px 15px;border-radius:999px;font-size:11px;transition:.2s;max-width:min(90vw,620px);text-align:center}.toast.show{opacity:1;transform:translate(-50%,0)}
.mobile-panel-toggle{display:none}

@media(max-width:1120px){
  :root{--rail:184px}
  .work-area{grid-template-columns:minmax(0,1fr) 230px}
  .track-meta{width:160px}
  .player-actions .btn span{display:none}
  #newAttemptButton::before{content:"重画"}
  #saveVersionButton::before{content:"存新终稿"}
  .brush-grid{grid-template-columns:repeat(4,1fr)}
}
@media(max-width:820px){
  .app-header{height:56px;padding:0 10px}.studio-shell{width:100%;min-width:0;height:calc(100dvh - 56px);grid-template-columns:minmax(0,1fr);grid-template-rows:auto minmax(0,1fr)}
  .revision-guide{min-height:66px;padding:7px 10px;justify-content:space-between;gap:8px}
  .revision-guide>div{max-width:62%}
  .revision-guide .btn{max-width:38%;padding:0 9px;font-size:10px;line-height:1.3;text-align:center}
  body.revision-mode .studio-shell{height:calc(100dvh - 122px)}
  .brand{min-width:0}.brand-copy span{display:none}.header-center p,.identity-chip{display:none}.header-center h1{font-size:15px}.header-actions .home-label{display:none}
  .studio-rail{width:100%;max-width:100%;border-right:0;border-bottom:1px solid var(--line);display:block;overflow:hidden}
  .rail-head,.rail-foot{display:none}.round-nav{padding:6px 8px;display:grid;grid-template-columns:repeat(4,minmax(92px,1fr));overflow-x:auto}
  .round-btn{padding:7px;grid-template-columns:25px minmax(0,1fr);gap:6px}.round-no{width:25px;height:25px}.round-state{display:none}
  .studio-main{grid-template-rows:auto minmax(0,1fr)}.player-bar{min-height:64px;padding:7px 9px;gap:8px}.play-button{width:46px;height:46px}.track-meta{width:auto;min-width:100px}.track-meta span{display:none}
  .player-actions .btn:not(.marker-btn){display:none}
  .work-area{grid-template-columns:1fr;position:relative}.side-panel{position:absolute;z-index:30;top:0;right:0;bottom:0;width:min(310px,88vw);box-shadow:-12px 0 35px rgba(0,0,0,.18);transform:translateX(105%);transition:.2s}.side-panel.open{transform:translateX(0)}
  .board-column{padding:7px;grid-template-rows:minmax(0,1fr) auto}.canvas-stage{width:min(100%,calc((100dvh - 280px) * 1.4142))}
  .mobile-panel-toggle{display:inline-flex}.tool-dock{padding:5px;min-height:54px}.tool-button{height:40px;min-width:40px}.slider-wrap{grid-template-columns:auto 70px 30px}.slider-wrap input{width:70px}
  .brush-popover{bottom:66px}.audio-slots{grid-template-columns:1fr}
}
@media(max-width:520px){
  .brand-mark{width:30px;height:30px}.brand-copy b{font-size:12px}.header-center{display:none}.header-actions{margin-left:auto}.app-header .btn{padding:0 9px;min-height:38px}
  .round-nav{width:100%;max-width:100%;grid-template-columns:none;grid-auto-flow:column;grid-auto-columns:118px;overscroll-behavior-inline:contain}.round-copy b{font-size:11px}
  .player-bar{display:grid;grid-template-columns:46px minmax(62px,auto) minmax(78px,1fr) auto}.player-actions{display:flex;flex-wrap:nowrap}.marker-btn{width:40px;padding:0}.marker-btn span{display:none!important}
  .canvas-wrap{border-radius:11px}.canvas-stage{width:min(100%,calc((100dvh - 250px) * 1.4142));max-height:none}.canvas-message>div{padding:12px}.canvas-message b{font-size:13px}
  .tool-group:nth-child(4){display:none}.tool-dock{gap:6px}.tool-button{font-size:10px;padding:0 7px}
  .brush-grid{grid-template-columns:repeat(3,1fr)}
  .reflection-grid{grid-template-columns:1fr}
  .reflection .wide{grid-column:auto}
  .reflection-label{align-items:flex-start;flex-direction:column;gap:1px}
  .reflection-label .rubric-hint{text-align:left;font-size:8.5px}
}
@media(max-height:500px) and (min-width:521px) and (max-width:1000px){
  .app-header{height:48px;padding:0 10px}
  .studio-shell{height:calc(100dvh - 48px)}
  .revision-guide{min-height:46px;padding:4px 10px}
  body.revision-mode .studio-shell{height:calc(100dvh - 94px)}
  .brand{min-width:180px}.brand-copy span,.header-center p,.identity-chip{display:none}
  .header-center h1{font-size:15px}
  .player-bar{min-height:58px;padding:4px 8px}
  .play-button{width:44px;height:44px}
  .canvas-stage{width:min(100%,calc((100dvh - 172px) * 1.4142))}
  .tool-dock{min-height:48px;padding:4px 6px}
  .tool-button,.swatch{height:36px;min-width:36px}.swatch{width:36px}
}
@media(prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}}