:root{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;color:#1d2733;background:#eef2f7}*{box-sizing:border-box}body{margin:0}.app{height:100vh;display:flex;flex-direction:column}header{height:82px;background:#fff;border-bottom:1px solid #d9e1ea;display:flex;align-items:center;justify-content:space-between;padding:14px 22px}h1{font-size:22px;margin:0 0 5px}header p{margin:0;color:#6b7785;font-size:13px}.header-actions{display:flex;gap:10px}.button{border:0;border-radius:8px;background:#2368d8;color:#fff;padding:10px 14px;font-weight:650;cursor:pointer}.button:hover{filter:brightness(.96)}.button.secondary{background:#e9eff8;color:#244a7c}.button.full{width:100%;margin-top:10px}main{flex:1;min-height:0;display:grid;grid-template-columns:240px minmax(420px,1fr) 360px}.sidebar{background:#fff;padding:18px;overflow:auto}.sidebar.left{border-right:1px solid #d9e1ea}.sidebar.right{border-left:1px solid #d9e1ea}.sidebar h2{font-size:15px;margin:0 0 12px;color:#2e3a49}.sidebar h2:not(:first-child){margin-top:24px}.example{width:100%;text-align:left;border:1px solid #dce4ee;background:#f8fafc;border-radius:8px;padding:11px 10px;margin-bottom:8px;cursor:pointer;color:#253344}.example.active{border-color:#4a86e8;background:#edf4ff;color:#174d9e}.sidebar label{display:block;font-size:14px;margin:12px 0}.sidebar input[type=range]{width:100%;margin-top:6px}.help{margin-top:22px;background:#f6f8fb;border-radius:8px;padding:12px;font-size:13px;color:#5c6875}.help p{margin:6px 0}.stage-wrap{position:relative;min-width:0;min-height:0;background:radial-gradient(circle at 50% 35%,#fff 0,#e9eef5 65%,#dfe6ee 100%)}#stage{width:100%;height:100%;display:block;cursor:grab;touch-action:none}#stage:active{cursor:grabbing}.badge{position:absolute;left:16px;top:14px;background:rgba(255,255,255,.9);padding:7px 10px;border-radius:7px;font-size:12px;color:#51606f;box-shadow:0 2px 8px rgba(0,0,0,.08)}#sceneTitle{font-size:18px;margin-bottom:10px}.problem{font-size:14px;line-height:1.7;background:#f6f8fb;border-radius:8px;padding:11px;margin-bottom:15px;white-space:pre-wrap}.step-card{border:1px solid #dce4ee;border-radius:10px;padding:14px;background:#fff;min-height:190px}.step-head{display:flex;justify-content:space-between;font-size:12px;color:#6c7885}.step-card h3{font-size:17px;margin:14px 0 9px}.step-card p{font-size:14px;line-height:1.7;margin:0}.prompt{margin-top:14px;padding:10px;border-left:4px solid #f0a020;background:#fff8e8;color:#744b00;font-size:13px}.controls{display:grid;grid-template-columns:1fr 1fr 1fr;gap:8px;margin-top:12px}.controls .button{padding:10px 5px}.speed{font-size:13px;color:#647180;margin-top:12px!important}.speed select{float:right}.legend ul{padding-left:20px;font-size:13px;line-height:1.7}.legend li{margin-bottom:5px}.tabs{display:grid;grid-template-columns:1fr 1fr;gap:6px;margin-bottom:16px}.tab{border:0;border-radius:7px;padding:9px;background:#eef2f7;color:#526170;font-weight:700;cursor:pointer}.tab.active{background:#2368d8;color:#fff}.panel{display:none}.panel.active{display:block}.text-input,.coord-grid input,.coord-grid select{width:100%;border:1px solid #cfd9e5;border-radius:6px;padding:8px;background:#fff}.coord-grid{display:grid;grid-template-columns:1fr 1fr 1fr;gap:8px}.coord-grid label{margin:4px 0}.edit-note{font-size:12px;line-height:1.5;color:#657281}#jsonEditor{width:100%;height:300px;resize:vertical;border:1px solid #cfd9e5;border-radius:7px;padding:10px;font:12px/1.5 ui-monospace,SFMono-Regular,Menlo,monospace;white-space:pre}.edit-actions{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin-top:8px}.edit-status{font-size:12px;margin-top:8px;min-height:20px;color:#277044}.edit-status.error{color:#b42318}@media(max-width:1050px){main{grid-template-columns:200px 1fr}.sidebar.right{position:absolute;right:0;top:82px;bottom:0;width:340px;box-shadow:-4px 0 12px rgba(0,0,0,.1)}.stage-wrap{margin-right:340px}}
.small-editor{width:100%;min-height:80px;resize:vertical;border:1px solid #ccd6e3;border-radius:8px;padding:9px;font:14px/1.5 sans-serif;box-sizing:border-box}.danger{background:#c83b3b!important}.right .tabs{grid-template-columns:repeat(3,1fr)}#animationPanel{overflow:auto}.header-actions{flex-wrap:wrap}input[type=color]{width:100%;height:38px;border:1px solid #ccd6e3;border-radius:8px;background:white;padding:3px;box-sizing:border-box}

.axes-editor{min-height:104px}.axis-presets{display:grid;grid-template-columns:1fr 1fr;gap:8px}.axis-presets .button{padding:9px 6px}

/* V0.6 */
.mode-switch{display:flex;gap:8px;margin-left:auto;margin-right:12px}.button.mode.active{box-shadow:0 0 0 2px rgba(35,104,216,.18)}
#annotationLayer{position:absolute;inset:0;width:100%;height:100%;display:block;pointer-events:none;touch-action:none}.annotation-tools{position:absolute;right:16px;top:14px;display:flex;gap:8px;align-items:center;background:rgba(255,255,255,.94);padding:7px 9px;border-radius:10px;box-shadow:0 2px 12px rgba(0,0,0,.10)}.annotation-tools.active{outline:2px solid #2368d8}.mini-button{border:0;border-radius:7px;background:#2368d8;color:white;padding:7px 10px;font-weight:700}.mini-button.secondary{background:#e9eff8;color:#244a7c}.annotation-tools input[type=color]{width:32px;height:30px;border:0;background:none;padding:0}.annotation-tools input[type=range]{width:80px}
.classroom-controls{display:none;position:absolute;left:50%;bottom:18px;transform:translateX(-50%);gap:10px;padding:10px;background:rgba(255,255,255,.94);border-radius:12px;box-shadow:0 4px 18px rgba(0,0,0,.15)}
.object-tree{display:grid;gap:6px}.object-tree button{display:flex;justify-content:space-between;width:100%;border:1px solid #dce4ee;background:#f8fafc;border-radius:7px;padding:8px 10px;color:#253344}.object-tree button:hover{background:#edf4ff}.object-tree small{color:#6b7785}.timeline{display:flex;gap:7px;overflow-x:auto;padding:6px 0 10px}.timeline button{min-width:72px;border:1px solid #dce4ee;background:#f8fafc;border-radius:8px;padding:8px;color:#253344}.timeline button.active{background:#2368d8;color:white;border-color:#2368d8}
body.classroom header,body.classroom .sidebar{display:none}body.classroom main{display:block}body.classroom .stage-wrap{height:100vh}body.classroom .classroom-controls{display:flex}body.classroom .annotation-tools{top:16px;right:16px}body.classroom .badge{top:16px;left:16px}
@media(max-width:1180px){header{height:auto;min-height:76px;flex-wrap:wrap;gap:10px}.mode-switch{order:2;margin-left:0}.header-actions{order:3;margin-left:auto}main{grid-template-columns:210px minmax(0,1fr) 330px}}
@media(max-width:900px){.app{min-height:100dvh;height:100dvh}header{padding:10px 12px}.header-actions{width:100%;display:grid;grid-template-columns:1fr 1fr 1fr}.header-actions .button{padding:9px 6px;font-size:12px}main{display:grid;grid-template-columns:1fr;grid-template-rows:minmax(52dvh,1fr) auto}.stage-wrap{grid-row:1}.sidebar.left,.sidebar.right{grid-row:2;border:0;border-top:1px solid #d9e1ea;max-height:42dvh}.sidebar.left{display:none}.sidebar.right{padding:12px}.tabs{position:sticky;top:0;background:#fff;z-index:3;padding-bottom:6px}.annotation-tools{top:auto;bottom:78px;right:10px;max-width:calc(100% - 20px)}.badge{left:10px;top:10px}.controls .button{min-height:44px}.button,.tab,.example{min-height:44px}.classroom-controls{bottom:14px;width:calc(100% - 24px);justify-content:center}.classroom-controls .button{flex:1;padding:12px 6px}}
@media(pointer:coarse){button,.button,.tab,select,input{font-size:16px}.annotation-tools{padding:9px}.mini-button{min-height:42px}#stage{cursor:default}}


/* ===== V0.7：iPad 连接与 PWA ===== */
.modal-backdrop{
  position:fixed;inset:0;z-index:1000;background:rgba(15,23,42,.48);
  display:flex;align-items:center;justify-content:center;padding:24px;
}
.modal-backdrop[hidden]{display:none}
.modal-card{
  width:min(620px,100%);background:#fff;border-radius:18px;
  box-shadow:0 24px 70px rgba(15,23,42,.28);padding:22px;
}
.modal-head{display:flex;align-items:center;justify-content:space-between;gap:16px}
.modal-head h2{margin:0}
.url-box{
  margin:16px 0;padding:16px;border:2px solid #2468d8;border-radius:12px;
  background:#eef5ff;font-size:20px;font-weight:700;word-break:break-all;
  user-select:all;-webkit-user-select:all;
}
.modal-actions{display:flex;gap:10px;flex-wrap:wrap}
@media (pointer:coarse){
  button,.button,.tab,.example,.mini-button{min-height:46px}
  input,select,textarea{font-size:16px}
}
@media (max-width:1024px){
  .modal-card{width:min(700px,96vw)}
  .url-box{font-size:18px}
}


/* V0.9 iPad connection */
.connection-badge{padding:12px 14px;border-radius:10px;background:#e9f7ef;color:#176b3a;font-weight:700;margin:12px 0}
.connection-badge.error{background:#fff0f0;color:#a12626}
.connection-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.connection-grid h3{margin:6px 0 8px}
.url-box.small{font-size:15px}
.qr-wrap{text-align:center;padding:14px 0 4px}
.qr-wrap img{width:230px;height:230px;background:white;border:1px solid #d7e0ed;border-radius:12px;padding:8px}
.qr-wrap p{margin:7px 0 0;color:#64748b}
body.student-mode .app-header .header-actions,
body.student-mode .left-panel,
body.student-mode .right-panel,
body.student-mode .annotation-tools{display:none!important}
body.student-mode .workspace{grid-template-columns:1fr!important}
body.student-mode .stage{min-height:100vh}
@media(max-width:760px){.connection-grid{grid-template-columns:1fr}.qr-wrap img{width:210px;height:210px}}


/* ===== V1.0 Teacher Edition：iPad 教师授课端 ===== */
.connection-card{
  border:1px solid #d9e4f2;border-radius:14px;padding:14px;background:#f9fbff;
  display:flex;flex-direction:column;align-items:stretch;
}
.connection-card h3{margin:0 0 6px}
.connection-card p{font-size:12px;line-height:1.45;color:#617083;margin:0 0 10px}
.connection-card.teacher-card{border-color:#80aef5;background:#f3f8ff}
.connection-card.student-card{border-color:#cfd8e5;background:#fbfcfe}
.mode-qr{width:190px;height:190px;max-width:100%;object-fit:contain;align-self:center;margin:10px 0}
.desktop-url-line{margin-top:12px;padding:10px 12px;border-radius:9px;background:#f4f6f9;font-size:13px;word-break:break-all}
.annotation-tools.tools-hidden{display:none!important}

body.ipad-teacher-mode{
  overscroll-behavior:none;
  -webkit-user-select:none;
  user-select:none;
}
body.ipad-teacher-mode .annotation-tools{
  display:flex;
  position:fixed;
  z-index:80;
  top:max(14px,env(safe-area-inset-top));
  right:max(14px,env(safe-area-inset-right));
  max-width:calc(100vw - 28px);
}
body.ipad-teacher-mode .classroom-controls{
  display:flex;
  position:fixed;
  z-index:90;
  left:50%;
  bottom:max(12px,env(safe-area-inset-bottom));
  transform:translateX(-50%);
  width:min(760px,calc(100vw - 24px));
  flex-wrap:nowrap;
}
body.ipad-teacher-mode .classroom-controls .button{
  flex:1 1 0;
  min-width:0;
  min-height:54px;
  font-size:17px;
  padding:10px 8px;
  white-space:nowrap;
}
body.ipad-teacher-mode .stage-wrap{
  height:100dvh!important;
  min-height:100dvh;
  padding-bottom:calc(84px + env(safe-area-inset-bottom));
}
body.ipad-teacher-mode #stage,
body.ipad-teacher-mode #annotationLayer{
  height:100%;
}
body.ipad-teacher-mode .badge{
  top:max(12px,env(safe-area-inset-top));
  left:max(12px,env(safe-area-inset-left));
}
body.student-mode .annotation-tools,
body.student-mode .teacher-only-control{display:none!important}
body.student-mode .classroom-controls{
  width:min(560px,calc(100vw - 24px));
}
body.student-mode .classroom-controls .button{
  min-height:52px;font-size:17px;
}
body.student-mode .exit-control{display:none!important}
body.student-mode .stage-wrap{
  padding-bottom:calc(78px + env(safe-area-inset-bottom));
}

@media(max-width:900px){
  .teacher-student-grid{grid-template-columns:1fr 1fr}
  body.classroom .stage-wrap{height:100dvh!important}
  body.classroom .classroom-controls{
    bottom:max(10px,env(safe-area-inset-bottom));
    width:calc(100vw - 20px);
    max-width:760px;
    padding:8px;
  }
  body.classroom .classroom-controls .button{
    min-height:50px;
  }
}

@media(max-width:720px),(orientation:portrait){
  .teacher-student-grid{grid-template-columns:1fr}
  .mode-qr{width:160px;height:160px}
  body.ipad-teacher-mode .classroom-controls{
    display:grid;
    grid-template-columns:repeat(3,1fr);
    width:calc(100vw - 16px);
    gap:6px;
  }
  body.ipad-teacher-mode .classroom-controls .teacher-only-control,
  body.ipad-teacher-mode .classroom-controls .exit-control{
    grid-column:auto;
  }
  body.ipad-teacher-mode .annotation-tools{
    left:8px;right:8px;top:max(8px,env(safe-area-inset-top));
    justify-content:center;flex-wrap:wrap;
  }
}

@media(max-height:650px) and (orientation:landscape){
  body.ipad-teacher-mode .annotation-tools{
    top:8px;right:8px;padding:5px 7px;
  }
  body.ipad-teacher-mode .annotation-tools .mini-button{min-height:38px;padding:6px 9px}
  body.ipad-teacher-mode .classroom-controls{bottom:6px;padding:6px}
  body.ipad-teacher-mode .classroom-controls .button{min-height:44px;font-size:15px}
  body.ipad-teacher-mode .stage-wrap{padding-bottom:62px}
}


/* ===== V1.1 presentation state and Pencil tuning ===== */
#annotationLayer{will-change:contents;overscroll-behavior:none;-webkit-user-select:none;user-select:none}
body.ipad-teacher-mode:not(.classroom) header{display:flex}
body.ipad-teacher-mode:not(.classroom) main{display:grid}
body.ipad-teacher-mode:not(.classroom) .sidebar.left{display:none}
body.ipad-teacher-mode:not(.classroom) .sidebar.right{display:block}
body.ipad-teacher-mode:not(.classroom) .annotation-tools{display:none}
body.presentation-student .annotation-tools,
body.presentation-student .teacher-only-control{display:none!important}
body.presentation-student .exit-control{display:inline-flex!important}
body.ipad-teacher-mode:not(.classroom) .mode-switch{display:flex!important}
body.ipad-teacher-mode:not(.classroom) .header-actions{display:none!important}
@media(max-width:1024px){
 body.ipad-teacher-mode:not(.classroom) header{position:sticky;top:0;z-index:95;padding:8px 10px}
 body.ipad-teacher-mode:not(.classroom) header>div:first-child{display:none}
 body.ipad-teacher-mode:not(.classroom) .mode-switch{width:100%;display:grid!important;grid-template-columns:1fr 1fr;gap:8px}
 body.ipad-teacher-mode:not(.classroom) .mode-switch .button{min-height:48px}
 body.ipad-teacher-mode:not(.classroom) main{grid-template-columns:1fr;grid-template-rows:1fr auto;height:calc(100dvh - 66px)}
 body.ipad-teacher-mode:not(.classroom) .stage-wrap{height:auto!important;min-height:60dvh;padding-bottom:0}
 body.ipad-teacher-mode:not(.classroom) .sidebar.right{max-height:34dvh;overflow:auto}
}


/* ===== V1.1.1：iPad 退出演示后的双栏布局与 Pencil 优化 ===== */
#annotationLayer{
  touch-action:none;
  -webkit-touch-callout:none;
  -webkit-user-select:none;
  user-select:none;
  contain:strict;
}

/* iPad 教师端退出全屏后：左侧大图形、右侧讲解编辑，不再采用上下堆叠。 */
body.ipad-teacher-mode:not(.classroom) main{
  display:grid!important;
  grid-template-columns:minmax(0,62%) minmax(340px,38%)!important;
  grid-template-rows:1fr!important;
  height:calc(100dvh - 66px)!important;
  min-height:0;
}
body.ipad-teacher-mode:not(.classroom) .sidebar.left{
  display:none!important;
}
body.ipad-teacher-mode:not(.classroom) .stage-wrap{
  grid-column:1!important;
  grid-row:1!important;
  margin:0!important;
  height:100%!important;
  min-height:0!important;
  padding-bottom:0!important;
}
body.ipad-teacher-mode:not(.classroom) .sidebar.right{
  display:block!important;
  position:static!important;
  grid-column:2!important;
  grid-row:1!important;
  width:auto!important;
  max-height:none!important;
  height:100%!important;
  overflow:auto!important;
  border-left:1px solid #d9e1ea!important;
  border-top:0!important;
  box-shadow:none!important;
  padding:14px!important;
}
body.ipad-teacher-mode:not(.classroom) .tabs{
  position:sticky;
  top:0;
  z-index:5;
}

/* 横屏 iPad 优先保证模型区域占比。 */
@media (orientation:landscape) and (pointer:coarse){
  body.ipad-teacher-mode:not(.classroom) main{
    grid-template-columns:minmax(0,64%) minmax(350px,36%)!important;
  }
}

/* 竖屏空间不足时才回退为上下布局。 */
@media (orientation:portrait) and (max-width:900px){
  body.ipad-teacher-mode:not(.classroom) main{
    grid-template-columns:1fr!important;
    grid-template-rows:minmax(52dvh,1fr) minmax(0,42dvh)!important;
  }
  body.ipad-teacher-mode:not(.classroom) .stage-wrap{
    grid-column:1!important;grid-row:1!important;
  }
  body.ipad-teacher-mode:not(.classroom) .sidebar.right{
    grid-column:1!important;grid-row:2!important;
    border-left:0!important;border-top:1px solid #d9e1ea!important;
  }
}


/* ===== V1.1.2：Apple Pencil 事件隔离 ===== */
body.inking-active{
  overflow:hidden!important;
  overscroll-behavior:none!important;
}
body.inking-active #stage{
  pointer-events:none!important;
}
body.inking-active #annotationLayer{
  pointer-events:auto!important;
  touch-action:none!important;
  cursor:crosshair;
}
#annotationLayer{
  -webkit-user-drag:none;
  -webkit-tap-highlight-color:transparent;
}


/* ===== V1.2 Scene Builder ===== */
.scene-builder-card{
  margin-bottom:16px;
  padding:13px;
  border:1px solid #b8d1f5;
  border-radius:13px;
  background:linear-gradient(180deg,#f5f9ff,#ffffff);
}
.builder-title-row{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:10px;
}
.builder-title-row h2{margin:0}
.builder-version{
  padding:3px 8px;
  border-radius:999px;
  background:#2468d8;
  color:#fff;
  font-size:11px;
  font-weight:700;
}
.builder-prompt{
  min-height:86px;
  margin-top:6px;
}
.builder-presets{
  display:flex;
  flex-wrap:wrap;
  gap:6px;
  margin:8px 0;
}
.builder-options{
  margin:8px 0 10px;
  padding:8px 10px;
  border-radius:9px;
  background:#f4f7fb;
}
.builder-options summary{
  cursor:pointer;
  font-weight:700;
  color:#31537d;
}
.builder-number-grid{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:7px;
  margin-top:8px;
}
.builder-number-grid input{
  width:100%;
}
@media(max-width:1100px){
  .builder-number-grid{grid-template-columns:1fr 1fr}
}


/* ===== V1.2.1 Scene Builder Pro ===== */
.builder-action-row{
  display:grid;
  grid-template-columns:1fr 1.25fr;
  gap:8px;
  margin-top:10px;
}
.builder-action-row .button{width:100%}
.builder-priority-note{
  margin:8px 0 0;
  color:#66758a;
  font-size:11px;
  line-height:1.45;
}
.ipad-builder-fab{
  position:fixed;
  z-index:92;
  left:max(12px,env(safe-area-inset-left));
  bottom:calc(82px + env(safe-area-inset-bottom));
  border:0;
  border-radius:999px;
  padding:12px 18px;
  color:#fff;
  background:#2468d8;
  font-size:16px;
  font-weight:700;
  box-shadow:0 8px 24px rgba(27,76,151,.28);
}
.ipad-builder-fab[hidden]{display:none!important}
.builder-drawer-backdrop{
  position:fixed;
  inset:0;
  z-index:200;
  background:rgba(15,23,42,.42);
}
.builder-drawer-backdrop[hidden]{display:none}
.builder-drawer{
  position:absolute;
  top:0;
  left:0;
  width:min(430px,88vw);
  height:100dvh;
  display:flex;
  flex-direction:column;
  background:#f7f9fc;
  box-shadow:18px 0 50px rgba(15,23,42,.24);
  padding-top:env(safe-area-inset-top);
}
.builder-drawer-head{
  display:flex;
  justify-content:space-between;
  align-items:center;
  gap:12px;
  padding:14px;
  border-bottom:1px solid #d9e1ea;
  background:#fff;
}
.builder-drawer-head strong{font-size:19px}
.builder-drawer-head div div{font-size:12px;color:#6b7788;margin-top:2px}
.builder-drawer-body{
  overflow:auto;
  padding:12px;
  -webkit-overflow-scrolling:touch;
}
.builder-drawer-body .scene-builder-card{
  margin:0;
  box-shadow:none;
}
body.builder-drawer-open{overflow:hidden}
body.ipad-teacher-mode .ipad-builder-fab{display:block}
body.student-mode .ipad-builder-fab{display:none!important}

@media(max-width:700px){
  .builder-action-row{grid-template-columns:1fr}
  .builder-drawer{width:94vw}
}


/* ===== V1.3 Prompt-only Builder 与数学关系分析 ===== */
.builder-prompt-guide{
  margin:8px 0 10px;
  padding:9px 10px;
  border-radius:9px;
  background:#eef5ff;
  color:#48627f;
  font-size:12px;
  line-height:1.55;
}
.relations-title-row{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:8px;
}
.relations-title-row h2{margin:0}
.relation-analysis-status{
  min-height:18px;
  margin:4px 0 6px;
  color:#2b7a43;
  font-size:11px;
}
.relation-analysis-status.error{color:#b42318}


/* ===== V1.3.1：编辑面板数学关系分析入口 ===== */
.edit-analysis-card{
  display:grid;
  grid-template-columns:minmax(0,1fr) auto;
  gap:10px;
  align-items:center;
  padding:12px;
  margin-bottom:14px;
  border:1px solid #bfd3ef;
  border-radius:12px;
  background:#f5f9ff;
}
.edit-analysis-card strong{font-size:15px}
.edit-analysis-card p{
  margin:4px 0 0;
  color:#66758a;
  font-size:12px;
  line-height:1.45;
}
.edit-analysis-card .relation-analysis-status{
  grid-column:1/-1;
  margin:0;
}


/* ===== V1.4 自动动画生成 ===== */
.auto-animation-card{
  margin-bottom:16px;
  padding:13px;
  border:1px solid #b9d2f5;
  border-radius:13px;
  background:linear-gradient(180deg,#f4f8ff,#ffffff);
}
.auto-animation-title{
  display:flex;
  justify-content:space-between;
  align-items:flex-start;
  gap:10px;
  margin-bottom:10px;
}
.auto-animation-title h2{margin:0}
.auto-animation-title p{
  margin:4px 0 0;
  color:#66758a;
  font-size:12px;
  line-height:1.45;
}
.auto-animation-title span{
  padding:3px 8px;
  border-radius:999px;
  color:#fff;
  background:#2468d8;
  font-size:11px;
  font-weight:700;
}
.auto-animation-options{
  display:grid;
  gap:6px;
  margin:8px 0 11px;
  padding:9px;
  border-radius:9px;
  background:#f4f7fb;
}
.auto-animation-card textarea{
  min-height:72px;
}


/* ===== V1.5 Natural Language Editor ===== */
.nl-editor-card{
  margin-bottom:16px;
  padding:13px;
  border:1px solid #c4b9f4;
  border-radius:13px;
  background:linear-gradient(180deg,#f8f5ff,#ffffff);
}
.nl-editor-title{
  display:flex;
  justify-content:space-between;
  gap:10px;
  align-items:flex-start;
}
.nl-editor-title h2{margin:0}
.nl-editor-title p{
  margin:4px 0 0;
  color:#66758a;
  font-size:12px;
  line-height:1.45;
}
.nl-editor-title span{
  padding:3px 8px;
  border-radius:999px;
  color:#fff;
  background:#7555c7;
  font-size:11px;
  font-weight:700;
}
.nl-command-input{
  min-height:150px;
  margin-top:10px;
}
.nl-preset-row{
  display:flex;
  flex-wrap:wrap;
  gap:6px;
  margin:8px 0;
}
.nl-editor-options{
  display:grid;
  gap:6px;
  padding:9px;
  margin:8px 0;
  border-radius:9px;
  background:#f4f2fb;
}
.nl-action-row{
  display:grid;
  grid-template-columns:1fr 1fr 1fr;
  gap:7px;
}
.nl-command-plan{
  display:grid;
  gap:6px;
  margin-top:10px;
}
.nl-plan-item{
  display:flex;
  align-items:flex-start;
  gap:9px;
  padding:8px 9px;
  border:1px solid #ded8ef;
  border-radius:9px;
  background:#fff;
}
.nl-plan-item>span{
  display:grid;
  place-items:center;
  flex:0 0 22px;
  height:22px;
  border-radius:50%;
  background:#7555c7;
  color:#fff;
  font-size:11px;
  font-weight:700;
}
.nl-plan-item strong{display:block;font-size:12px}
.nl-plan-item small{display:block;color:#7d8795;margin-top:2px}
.nl-plan-item.error{border-color:#e2a5a5;background:#fff6f6}

.ipad-nl-editor-fab{
  position:fixed;
  z-index:93;
  left:max(12px,env(safe-area-inset-left));
  bottom:calc(138px + env(safe-area-inset-bottom));
  border:0;
  border-radius:999px;
  padding:12px 18px;
  color:#fff;
  background:#7555c7;
  font-size:16px;
  font-weight:700;
  box-shadow:0 8px 24px rgba(75,46,145,.28);
}
.ipad-nl-editor-fab[hidden]{display:none!important}
.nl-drawer-backdrop{
  position:fixed;
  inset:0;
  z-index:210;
  background:rgba(15,23,42,.42);
}
.nl-drawer-backdrop[hidden]{display:none}
.nl-drawer{
  position:absolute;
  top:0;
  right:0;
  width:min(480px,92vw);
  height:100dvh;
  display:flex;
  flex-direction:column;
  padding-top:env(safe-area-inset-top);
  background:#f7f7fb;
  box-shadow:-18px 0 50px rgba(15,23,42,.24);
}
.nl-drawer-head{
  display:flex;
  justify-content:space-between;
  align-items:center;
  gap:12px;
  padding:14px;
  border-bottom:1px solid #ded8ef;
  background:#fff;
}
.nl-drawer-head strong{font-size:19px}
.nl-drawer-head div div{font-size:12px;color:#6b7788;margin-top:2px}
.nl-drawer-body{
  overflow:auto;
  padding:12px;
  -webkit-overflow-scrolling:touch;
}
.nl-drawer-body .nl-editor-card{margin:0}
body.nl-drawer-open{overflow:hidden}
body.student-mode .ipad-nl-editor-fab{display:none!important}

@media(max-width:720px){
  .nl-action-row{grid-template-columns:1fr}
  .nl-drawer{width:96vw}
}

.nl-supported-commands{margin:8px 0;padding:8px 10px;border-radius:9px;background:#f7f5fc;color:#536174;font-size:12px;line-height:1.6}
.nl-supported-commands summary{cursor:pointer;color:#6044ad;font-weight:700}
.nl-supported-commands div{margin-top:6px}

#toggleAxesPresentation.active{
  background:#286bd6;
  color:#fff;
}


/* ===== V1.6 Construction Engine ===== */
.construction-card{
  margin-bottom:16px;
  padding:13px;
  border:1px solid #b8d9c3;
  border-radius:13px;
  background:linear-gradient(180deg,#f3fbf6,#ffffff);
}
.construction-title{
  display:flex;
  justify-content:space-between;
  gap:10px;
  align-items:flex-start;
}
.construction-title h2{margin:0}
.construction-title p{
  margin:4px 0 0;
  color:#66758a;
  font-size:12px;
  line-height:1.45;
}
.construction-title span{
  padding:3px 8px;
  border-radius:999px;
  color:#fff;
  background:#2d8a54;
  font-size:11px;
  font-weight:700;
}
.construction-fields{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:8px;
  margin:9px 0;
}
.construction-options{
  display:grid;
  gap:6px;
  padding:9px;
  margin:8px 0;
  border-radius:9px;
  background:#f0f7f2;
}
.construction-actions{
  display:grid;
  grid-template-columns:1fr 1fr 1fr;
  gap:7px;
}
.construction-preview{
  margin-top:10px;
  min-height:18px;
  padding:8px 9px;
  border-radius:9px;
  background:#f7faf8;
  color:#415448;
  font-size:12px;
  line-height:1.5;
}
.construction-empty{color:#7b8794;font-size:12px}
@media(max-width:720px){
  .construction-fields,.construction-actions{grid-template-columns:1fr}
}


/* ===== V1.7 Measure Engine ===== */
.measure-card{
  margin-bottom:16px;
  padding:13px;
  border:1px solid #e3c37a;
  border-radius:13px;
  background:linear-gradient(180deg,#fffaf0,#ffffff);
}
.measure-title{
  display:flex;
  justify-content:space-between;
  align-items:flex-start;
  gap:10px;
}
.measure-title h2{margin:0}
.measure-title p{
  margin:4px 0 0;
  color:#66758a;
  font-size:12px;
  line-height:1.45;
}
.measure-title span{
  padding:3px 8px;
  border-radius:999px;
  background:#c58718;
  color:#fff;
  font-size:11px;
  font-weight:700;
}
.measure-fields{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:8px;
  margin:9px 0;
}
.measure-options{
  display:grid;
  gap:6px;
  margin:8px 0;
  padding:9px;
  border-radius:9px;
  background:#fff7e6;
}
.measure-actions{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:8px;
}
.measure-result{
  margin-top:10px;
  padding:10px;
  border-radius:10px;
  background:#fff9ec;
  text-align:center;
}
.measure-result:empty{display:none}
.measure-result-title{font-size:12px;color:#6d5a35}
.measure-result-value{margin-top:3px;font-size:24px;font-weight:800;color:#9a6400}
.measure-empty{font-size:12px;color:#7b8794}
@media(max-width:720px){
  .measure-fields,.measure-actions{grid-template-columns:1fr}
}


/* ===== V1.8 Course Engine ===== */
.course-card{
  margin-bottom:16px;
  padding:13px;
  border:1px solid #9fc4e9;
  border-radius:13px;
  background:linear-gradient(180deg,#f3f8fe,#ffffff);
}
.course-title{
  display:flex;
  justify-content:space-between;
  gap:10px;
  align-items:flex-start;
}
.course-title h2{margin:0}
.course-title p{
  margin:4px 0 0;
  color:#66758a;
  font-size:12px;
  line-height:1.45;
}
.course-title span{
  padding:3px 8px;
  border-radius:999px;
  background:#1e69b5;
  color:#fff;
  font-size:11px;
  font-weight:700;
}
.course-meta-grid{
  display:grid;
  grid-template-columns:2fr 1fr;
  gap:8px;
  margin:10px 0;
}
.course-actions{
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:7px;
  margin:9px 0;
}
.course-actions .danger{
  background:#fff1f0;
  color:#b42318;
  border:1px solid #f0b6b1;
}
.course-scene-list{
  display:grid;
  gap:7px;
  max-height:310px;
  overflow:auto;
  margin:10px 0;
  padding-right:2px;
}
.course-scene-item{
  display:flex;
  align-items:center;
  gap:9px;
  padding:9px;
  border:1px solid #d6e2ee;
  border-radius:10px;
  background:#fff;
  cursor:pointer;
}
.course-scene-item.selected{
  border-color:#2d73c5;
  box-shadow:0 0 0 2px rgba(45,115,197,.12);
}
.course-order{
  display:grid;
  place-items:center;
  width:26px;height:26px;
  flex:0 0 26px;
  border-radius:50%;
  background:#e9f2fc;
  color:#245b96;
  font-weight:800;
}
.course-scene-main{min-width:0;flex:1}
.course-scene-main strong{
  display:block;
  white-space:nowrap;
  overflow:hidden;
  text-overflow:ellipsis;
}
.course-scene-main small{display:block;color:#758195;margin-top:2px}
.course-reorder{display:flex;gap:4px}
.course-scene-editor{
  display:grid;
  gap:8px;
  padding:10px;
  border-radius:10px;
  background:#f5f8fc;
}
.course-launch-row{
  display:grid;
  grid-template-columns:1.2fr 1.2fr 1fr;
  gap:8px;
  margin-top:10px;
}
.course-empty{
  padding:16px;
  border:1px dashed #b9c9da;
  border-radius:10px;
  color:#6d7b8c;
  text-align:center;
}
.course-presentation-bar{
  position:fixed;
  z-index:180;
  left:50%;
  bottom:calc(14px + env(safe-area-inset-bottom));
  transform:translateX(-50%);
  display:flex;
  align-items:center;
  gap:8px;
  max-width:calc(100vw - 24px);
  padding:8px;
  border:1px solid #cbd7e5;
  border-radius:14px;
  background:rgba(255,255,255,.96);
  box-shadow:0 12px 35px rgba(15,23,42,.2);
  backdrop-filter:blur(12px);
}
.course-presentation-bar[hidden]{display:none}
.course-progress{
  min-width:190px;
  max-width:330px;
  text-align:center;
}
.course-progress strong{
  display:block;
  white-space:nowrap;
  overflow:hidden;
  text-overflow:ellipsis;
}
.course-progress span{display:block;color:#687588;font-size:12px;margin-top:2px}
.course-notes-panel{
  position:fixed;
  z-index:190;
  right:max(14px,env(safe-area-inset-right));
  bottom:calc(82px + env(safe-area-inset-bottom));
  width:min(390px,calc(100vw - 28px));
  max-height:55vh;
  overflow:auto;
  padding:14px;
  border:1px solid #cbd7e5;
  border-radius:14px;
  background:#fffdf3;
  box-shadow:0 16px 45px rgba(15,23,42,.24);
}
.course-notes-panel[hidden]{display:none}
.course-notes-head{
  display:flex;
  justify-content:space-between;
  align-items:center;
  gap:10px;
  margin-bottom:10px;
}
#courseNotesContent{white-space:pre-wrap;line-height:1.65}
body.course-presentation-active .bottom-teacher-bar{
  bottom:calc(82px + env(safe-area-inset-bottom));
}
@media(max-width:900px){
  .course-actions{grid-template-columns:1fr 1fr}
  .course-presentation-bar{gap:5px}
  .course-progress{min-width:130px}
}
@media(max-width:650px){
  .course-meta-grid,.course-actions,.course-launch-row{grid-template-columns:1fr}
  .course-presentation-bar{
    width:calc(100vw - 16px);
    justify-content:center;
    flex-wrap:wrap;
  }
  .course-progress{order:-1;width:100%;max-width:none}
}


/* ===== V1.9 AI Copilot ===== */
.ai-primary{
  background:linear-gradient(135deg,#6d46d9,#2775dc)!important;
  color:#fff!important;
  border-color:transparent!important;
}
.ai-copilot-card{
  margin-bottom:16px;
  padding:14px;
  border:1px solid #b9abe9;
  border-radius:14px;
  background:linear-gradient(180deg,#f8f5ff,#ffffff);
}
.ai-copilot-title{
  display:flex;
  justify-content:space-between;
  align-items:flex-start;
  gap:12px;
}
.ai-copilot-title h2{margin:0}
.ai-copilot-title p{
  margin:4px 0 0;
  color:#66758a;
  font-size:12px;
  line-height:1.5;
}
.ai-copilot-title>span{
  padding:3px 9px;
  border-radius:999px;
  background:linear-gradient(135deg,#6d46d9,#2775dc);
  color:#fff;
  font-weight:800;
  font-size:11px;
}
.ai-status-row{
  display:flex;
  align-items:center;
  gap:7px;
  margin:10px 0;
}
.ai-badge{
  flex:1;
  padding:7px 9px;
  border-radius:9px;
  font-size:12px;
  font-weight:700;
}
.ai-badge.online{background:#e8f7ed;color:#237643}
.ai-badge.offline{background:#fff1ef;color:#b42318}
.ai-prompt{min-height:150px}
.ai-image-row{
  display:flex;
  align-items:center;
  gap:8px;
  margin:8px 0;
  font-size:12px;
  color:#637083;
}
.ai-image-button{
  padding:8px 10px;
  border-radius:9px;
  background:#eee9fb;
  color:#6044ad;
  font-weight:700;
  cursor:pointer;
}
.ai-image-preview img{
  display:block;
  max-width:100%;
  max-height:180px;
  margin:8px auto;
  border:1px solid #d9d2ef;
  border-radius:10px;
}
.ai-options{
  display:grid;
  gap:6px;
  margin:9px 0;
  padding:9px;
  border-radius:9px;
  background:#f5f2fc;
}
.ai-action-row{
  display:grid;
  grid-template-columns:1.2fr 1fr 1fr;
  gap:8px;
}
.ai-progress{
  display:flex;
  gap:10px;
  align-items:center;
  margin-top:10px;
  padding:10px;
  border-radius:10px;
  background:#eef4ff;
}
.ai-progress[hidden]{display:none}
.ai-progress strong,.ai-progress span{display:block}
.ai-progress span{margin-top:2px;color:#657287;font-size:12px}
.ai-spinner{
  width:24px;height:24px;
  border:3px solid #c8d9f5;
  border-top-color:#416fd0;
  border-radius:50%;
  animation:aiSpin .8s linear infinite;
}
@keyframes aiSpin{to{transform:rotate(360deg)}}
.ai-result-summary{
  margin-top:10px;
}
.ai-result-summary:empty{display:none}
.ai-result-head{
  display:flex;
  justify-content:space-between;
  gap:8px;
  padding:10px;
  border-radius:10px;
  background:#edf8f1;
  color:#265e3b;
}
.ai-result-head span{
  padding:2px 7px;
  border-radius:999px;
  background:#d9f0e2;
  font-size:11px;
}
.ai-warning,.ai-uncertain{
  margin-top:7px;
  padding:8px 10px;
  border-radius:9px;
  font-size:12px;
}
.ai-warning{background:#fff4e5;color:#825000}
.ai-uncertain{background:#fff8d9;color:#705900}
.ai-result-details{
  margin-top:8px;
  padding:8px;
  border-radius:9px;
  background:#f5f6f8;
}
.ai-result-details pre{
  max-height:330px;
  overflow:auto;
  white-space:pre-wrap;
  font-size:11px;
}
.ai-settings-backdrop{
  position:fixed;
  inset:0;
  z-index:260;
  display:grid;
  place-items:center;
  padding:16px;
  background:rgba(15,23,42,.48);
}
.ai-settings-backdrop[hidden]{display:none}
.ai-settings-modal{
  width:min(560px,100%);
  display:grid;
  gap:10px;
  padding:18px;
  border-radius:16px;
  background:#fff;
  box-shadow:0 20px 70px rgba(15,23,42,.3);
}
.ai-settings-head{
  display:flex;
  justify-content:space-between;
  gap:12px;
}
.ai-settings-head h2{margin:0}
.ai-settings-head p{margin:4px 0 0;color:#66758a;font-size:12px}
.ai-security-note{
  padding:9px;
  border-radius:9px;
  background:#eef7f1;
  color:#336247;
  font-size:12px;
}
.ai-settings-actions{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:8px;
}
body.ai-settings-open{overflow:hidden}
@media(max-width:720px){
  .ai-action-row,.ai-settings-actions{grid-template-columns:1fr}
  .ai-status-row{flex-wrap:wrap}
  .ai-badge{flex-basis:100%}
}


/* ===== V2.0 AI Workflow Center ===== */
.ai-workflow-card{
  margin-bottom:16px;
  padding:14px;
  border:1px solid #b9abe9;
  border-radius:14px;
  background:linear-gradient(180deg,#f8f5ff,#ffffff);
}
.ai-workflow-title{
  display:flex;
  justify-content:space-between;
  align-items:flex-start;
  gap:12px;
}
.ai-workflow-title h2{margin:0}
.ai-workflow-title p{
  margin:4px 0 0;
  color:#66758a;
  font-size:12px;
  line-height:1.5;
}
.ai-workflow-title>span{
  padding:3px 9px;
  border-radius:999px;
  background:linear-gradient(135deg,#6d46d9,#2775dc);
  color:#fff;
  font-weight:800;
  font-size:11px;
}
.workflow-step-grid{
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:7px;
  margin:12px 0;
}
.workflow-step{
  display:flex;
  align-items:center;
  gap:7px;
  padding:8px;
  border-radius:10px;
  background:#f1edfb;
  color:#554173;
  font-size:12px;
}
.workflow-step b{
  display:grid;
  place-items:center;
  width:22px;height:22px;
  border-radius:50%;
  background:#7555c7;
  color:#fff;
}
.workflow-request{min-height:120px}
.workflow-options{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:6px;
  margin:9px 0;
  padding:9px;
  border-radius:9px;
  background:#f5f2fc;
}
.workflow-actions{
  display:grid;
  grid-template-columns:1.1fr 1fr 1fr 1fr;
  gap:8px;
}
.workflow-prompt-output{
  min-height:260px;
  margin-top:6px;
  font-family:ui-monospace,SFMono-Regular,Menlo,monospace;
  font-size:11px;
}
.workflow-import-head{
  display:flex;
  justify-content:space-between;
  gap:10px;
  margin-top:14px;
}
.workflow-import-head span{
  color:#778295;
  font-size:11px;
}
.workflow-result-input{
  min-height:220px;
  margin-top:6px;
  font-family:ui-monospace,SFMono-Regular,Menlo,monospace;
  font-size:11px;
}
.workflow-import-actions{
  display:grid;
  grid-template-columns:repeat(5,1fr);
  gap:7px;
  margin-top:8px;
}
.workflow-report,.workflow-diff{
  margin-top:9px;
}
.workflow-report:empty,.workflow-diff:empty{display:none}
.workflow-report{
  padding:9px 10px;
  border-radius:9px;
  background:#eef7f1;
  color:#335f45;
  font-size:12px;
}
.workflow-report ul{margin:5px 0 0;padding-left:18px}
.workflow-diff{
  display:grid;
  gap:5px;
  padding:10px;
  border-radius:10px;
  background:#f7f8fa;
  font-size:12px;
}
.workflow-diff-head{font-weight:800;margin-bottom:3px}
.workflow-diff .added{color:#247342}
.workflow-diff .removed{color:#b42318}
.workflow-diff .changed{color:#8a5b00}
.workflow-info{
  padding:9px;
  border-radius:9px;
  background:#f4f6f8;
  color:#66758a;
  font-size:12px;
}
.workflow-history-box{
  margin-top:10px;
  padding:9px;
  border-radius:10px;
  background:#f5f2fc;
}
.workflow-history-box summary{
  cursor:pointer;
  color:#6044ad;
  font-weight:800;
}
.workflow-history-actions{
  display:flex;
  justify-content:flex-end;
  margin:7px 0;
}
.workflow-history{
  display:grid;
  gap:6px;
}
.workflow-history-item{
  display:flex;
  justify-content:space-between;
  align-items:center;
  gap:8px;
  padding:8px;
  border-radius:9px;
  background:#fff;
  border:1px solid #ddd6ef;
}
.workflow-history-item strong,.workflow-history-item small{display:block}
.workflow-history-item small{margin-top:2px;color:#7a8493}
@media(max-width:900px){
  .workflow-step-grid{grid-template-columns:1fr 1fr}
  .workflow-actions{grid-template-columns:1fr 1fr}
  .workflow-import-actions{grid-template-columns:1fr 1fr}
}
@media(max-width:600px){
  .workflow-step-grid,.workflow-options,.workflow-actions,.workflow-import-actions{grid-template-columns:1fr}
  .workflow-import-head{display:block}
  .workflow-import-head span{display:block;margin-top:3px}
}


/* ===== V2.0.1 Workflow narrow-panel layout & screenshot support ===== */
.ai-workflow-card,
.ai-workflow-card *{
  box-sizing:border-box;
  min-width:0;
}
.ai-workflow-card{
  width:100%;
  max-width:100%;
  overflow:hidden;
  padding:12px;
}
.ai-workflow-title{
  flex-wrap:wrap;
}
.ai-workflow-title>div{
  flex:1 1 220px;
  min-width:0;
}
.ai-workflow-title p,
.workflow-step span,
.workflow-image-heading span,
.workflow-image-tip{
  overflow-wrap:anywhere;
  word-break:break-word;
}

.workflow-step-grid{
  grid-template-columns:repeat(2,minmax(0,1fr));
  gap:7px;
}
.workflow-step{
  align-items:flex-start;
  min-height:58px;
  padding:8px 7px;
}
.workflow-step b{
  flex:0 0 22px;
}
.workflow-step span{
  line-height:1.35;
}

.ai-workflow-card label,
.ai-workflow-card textarea,
.ai-workflow-card select,
.ai-workflow-card input{
  width:100%;
  max-width:100%;
}
.workflow-request{
  min-height:132px;
  resize:vertical;
}
.workflow-options{
  grid-template-columns:1fr;
}
.workflow-options label{
  display:flex;
  align-items:flex-start;
  gap:7px;
  line-height:1.35;
}
.workflow-options input{
  width:auto;
  flex:0 0 auto;
  margin-top:2px;
}

.workflow-actions{
  grid-template-columns:repeat(2,minmax(0,1fr));
  gap:7px;
}
.workflow-actions .button,
.workflow-import-actions .button,
.workflow-image-actions .button{
  width:100%;
  min-width:0;
  height:auto;
  min-height:42px;
  padding:8px 6px;
  white-space:normal;
  overflow-wrap:anywhere;
  line-height:1.25;
}

.workflow-import-actions{
  grid-template-columns:repeat(2,minmax(0,1fr));
}
.workflow-import-actions .button:nth-child(4){
  grid-column:1 / -1;
}
.workflow-import-actions .button:nth-child(5){
  grid-column:1 / -1;
}

.workflow-image-section{
  margin:10px 0;
  padding:10px;
  border:1px solid #d8cdef;
  border-radius:11px;
  background:#fbf9ff;
}
.workflow-image-heading{
  display:flex;
  justify-content:space-between;
  align-items:flex-start;
  gap:8px;
  margin-bottom:8px;
}
.workflow-image-heading strong,
.workflow-image-heading span{
  display:block;
}
.workflow-image-heading span{
  margin-top:2px;
  color:#718095;
  font-size:11px;
  line-height:1.4;
}
.workflow-image-badge{
  flex:0 0 auto;
  max-width:42%;
  padding:3px 7px;
  border-radius:999px;
  background:#eceff4;
  color:#697586!important;
  font-size:10px!important;
  overflow:hidden;
  text-overflow:ellipsis;
  white-space:nowrap;
}
.workflow-image-badge.ready{
  background:#e6f5eb;
  color:#267243!important;
}
.workflow-image-dropzone{
  display:grid;
  place-items:center;
  width:100%;
  min-height:118px;
  padding:9px;
  overflow:hidden;
  border:2px dashed #b8a5df;
  border-radius:10px;
  background:#fff;
  cursor:pointer;
  outline:none;
}
.workflow-image-dropzone:focus,
.workflow-image-dropzone.dragging{
  border-color:#6d46d9;
  background:#f5f0ff;
  box-shadow:0 0 0 3px rgba(109,70,217,.12);
}
.workflow-image-placeholder{
  display:grid;
  gap:5px;
  text-align:center;
  color:#665184;
}
.workflow-image-placeholder span{
  color:#7b8796;
  font-size:11px;
}
#workflowImagePreview{
  display:block;
  width:auto;
  max-width:100%;
  max-height:220px;
  object-fit:contain;
  border-radius:7px;
}
#workflowImagePreview[hidden]{display:none}
.workflow-image-actions{
  display:grid;
  grid-template-columns:repeat(2,minmax(0,1fr));
  gap:7px;
  margin-top:8px;
}
.workflow-image-tip{
  margin-top:7px;
  padding:7px 8px;
  border-radius:8px;
  background:#fff7df;
  color:#765a13;
  font-size:11px;
  line-height:1.45;
}

.workflow-prompt-output,
.workflow-result-input{
  width:100%;
  max-width:100%;
  overflow:auto;
  resize:vertical;
}

@media(max-width:420px){
  .workflow-step-grid,
  .workflow-actions,
  .workflow-import-actions,
  .workflow-image-actions{
    grid-template-columns:1fr;
  }
  .workflow-import-actions .button:nth-child(4),
  .workflow-import-actions .button:nth-child(5){
    grid-column:auto;
  }
}


/* ===== V2.0.2 JSON Import Lite ===== */
.json-import-quick-help{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:10px;
  width:100%;
  margin:4px 0 12px;
  padding:10px;
  border:1px solid #c8d8ea;
  border-radius:10px;
  background:#f4f8fd;
  box-sizing:border-box;
}
.json-import-quick-help>div{
  flex:1 1 auto;
  min-width:0;
}
.json-import-quick-help strong,
.json-import-quick-help span{
  display:block;
}
.json-import-quick-help span{
  margin-top:3px;
  color:#66758a;
  font-size:12px;
  line-height:1.5;
  overflow-wrap:anywhere;
}
.json-import-quick-help .mini-button{
  flex:0 0 auto;
  white-space:nowrap;
}
@media(max-width:620px){
  .json-import-quick-help{
    align-items:stretch;
    flex-direction:column;
  }
  .json-import-quick-help .mini-button{
    width:100%;
  }
}


/* ===== V2.0.3 Core Lite ===== */
#simpleUiBtn.active{
  background:#286bd6;
  color:#fff;
}
.advanced-tools-heading{
  margin:4px 0 10px;
  padding:8px 10px;
  border-radius:9px;
  background:#eef3f8;
  color:#5d6b7d;
  font-size:12px;
  font-weight:700;
}

/* 简洁模式只保留课堂最常用功能：
   演示、对象属性、自然语言、JSON、基础显示设置。 */
body.simple-ui .course-card,
body.simple-ui .measure-card,
body.simple-ui .construction-card,
body.simple-ui .advanced-tools-heading{
  display:none!important;
}

/* 左栏隐藏低频坐标系长表单，保留显示设置与场景列表。 */
body.simple-ui #axesText,
body.simple-ui #applyAxesTextBtn,
body.simple-ui #hideAxesBtn,
body.simple-ui #fillAxesExampleBtn,
body.simple-ui #axesParseStatus{
  display:none!important;
}

/* 右侧编辑区减少视觉拥挤。 */
body.simple-ui .right-panel [data-tab-panel="edit"]{
  gap:12px;
}
body.simple-ui .nl-editor-card{
  margin-top:4px;
}
body.simple-ui #jsonEditor{
  min-height:260px;
}
#objectEditStatus{
  margin-top:7px;
}


/* ===== V2.1 Solid Library：顶部工具栏重构 ===== */
.app-header{
  height:auto;
  min-height:92px;
  display:grid;
  grid-template-columns:minmax(300px,390px) minmax(0,1fr);
  gap:18px;
  align-items:center;
  padding:12px 20px;
}
.header-brand{
  min-width:0;
}
.header-brand h1{
  font-size:21px;
  line-height:1.2;
}
.header-brand p{
  max-width:380px;
  line-height:1.45;
}
.header-toolbar{
  min-width:0;
  display:grid;
  gap:7px;
}
.toolbar-row{
  min-width:0;
  display:flex;
  align-items:center;
  gap:7px;
  flex-wrap:wrap;
}
.toolbar-primary{
  justify-content:space-between;
}
.toolbar-secondary{
  justify-content:flex-end;
  padding-top:6px;
  border-top:1px solid #edf1f5;
}
.mode-switch{
  display:flex;
  gap:7px;
  flex:0 0 auto;
  margin:0;
}
.header-action-group{
  min-width:0;
  display:flex;
  justify-content:flex-end;
  gap:7px;
  flex-wrap:wrap;
}
.compact-action,
.app-header .mode-switch .button,
#simpleUiBtn{
  min-height:38px;
  padding:8px 11px;
  border-radius:8px;
  font-size:13px;
  white-space:nowrap;
}
.toolbar-section-label{
  margin-right:2px;
  color:#738093;
  font-size:11px;
  font-weight:700;
}
.builder-presets{
  grid-template-columns:repeat(3,minmax(0,1fr));
}
.builder-presets .mini-button{
  min-width:0;
  padding:7px 4px;
  white-space:normal;
  line-height:1.25;
}

@media(max-width:1380px){
  .app-header{
    grid-template-columns:310px minmax(0,1fr);
  }
  .toolbar-primary{
    align-items:flex-start;
  }
  .header-action-group{
    flex:1 1 520px;
  }
}
@media(max-width:1080px){
  .app-header{
    grid-template-columns:1fr;
    gap:9px;
  }
  .header-brand p{
    max-width:none;
  }
  .toolbar-primary{
    justify-content:flex-start;
  }
  .header-action-group{
    justify-content:flex-start;
  }
  .toolbar-secondary{
    justify-content:flex-start;
  }
}
@media(max-width:720px){
  .app-header{
    padding:10px 12px;
  }
  .toolbar-row,
  .header-action-group{
    display:grid;
    grid-template-columns:repeat(2,minmax(0,1fr));
    width:100%;
  }
  .mode-switch{
    grid-column:1/-1;
    display:grid;
    grid-template-columns:repeat(3,minmax(0,1fr));
    width:100%;
  }
  .compact-action,
  .app-header .mode-switch .button,
  #simpleUiBtn{
    width:100%;
    min-width:0;
    white-space:normal;
  }
  .toolbar-section-label{
    grid-column:1/-1;
  }
}


/* ===== V2.2 iPad Access ===== */
.object-tree-details{
  margin:10px 0 14px;
  border:1px solid #dce5ef;
  border-radius:10px;
  background:#f8fafc;
  overflow:hidden;
}
.object-tree-details summary{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:10px;
  padding:10px 12px;
  cursor:pointer;
  list-style:none;
  font-weight:800;
  color:#253344;
  user-select:none;
}
.object-tree-details summary::-webkit-details-marker{display:none}
.object-tree-details summary::before{
  content:'▸';
  color:#59718d;
  transition:transform .18s ease;
}
.object-tree-details[open] summary::before{
  transform:rotate(90deg);
}
.object-tree-details summary span{
  flex:1;
}
.object-tree-details summary small{
  color:#7a8796;
  font-size:11px;
  font-weight:500;
}
.object-tree-details .object-tree{
  max-height:280px;
  overflow:auto;
  padding:0 10px 10px;
}

.stable-ipad-card,
.ipad-app-guide{
  margin:12px 0;
  padding:14px;
  border-radius:13px;
  border:1px solid #b9d8c6;
  background:#f3fbf6;
}
.stable-ipad-head{
  display:flex;
  align-items:flex-start;
  justify-content:space-between;
  gap:10px;
}
.stable-ipad-head h3,
.ipad-app-guide h3{
  margin:0;
}
.stable-ipad-head p{
  margin:4px 0 0;
  color:#5f7467;
  font-size:12px;
  line-height:1.5;
}
.stable-badge{
  flex:0 0 auto;
  padding:4px 9px;
  border-radius:999px;
  background:#2e8b57;
  color:#fff;
  font-size:11px;
  font-weight:800;
}
.stable-url{
  margin-top:10px;
  font-size:18px;
  font-weight:800;
  word-break:break-all;
}
.stable-qr{
  display:block;
  width:220px;
  max-width:100%;
  margin:12px auto;
}
.stable-actions{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:8px;
}
.ipad-app-guide{
  border-color:#c7d6ed;
  background:#f5f8fd;
}
.ipad-app-guide ol{
  margin:10px 0;
  padding-left:22px;
  line-height:1.7;
}
.ipad-app-guide p{
  margin:8px 0 0;
  color:#52647a;
  font-size:12px;
  line-height:1.55;
}
@media(max-width:680px){
  .stable-actions{
    grid-template-columns:1fr;
  }
}


/* ===== V3.0 Cloud Starter ===== */
.cloud-primary{background:#1769d2!important;color:#fff!important;border-color:#1769d2!important}
.cloud-sync-bar{display:flex;align-items:center;justify-content:flex-end;gap:7px;color:#5f6f82;font-size:12px}
.cloud-sync-dot{width:9px;height:9px;border-radius:50%;background:#9aa7b5;box-shadow:0 0 0 3px rgba(154,167,181,.14)}
.cloud-sync-dot.online{background:#29a35a}.cloud-sync-dot.saving{background:#2f77d0;animation:cloudPulse 1s infinite}.cloud-sync-dot.warning{background:#e39a18}.cloud-sync-dot.idle{background:#8b98aa}.cloud-sync-dot.offline{background:#c75050}
@keyframes cloudPulse{50%{opacity:.35}}
.cloud-backdrop{position:fixed;inset:0;z-index:300;display:grid;place-items:center;padding:16px;background:rgba(15,23,42,.52)}
.cloud-backdrop[hidden],.cloud-library-drawer[hidden]{display:none}
.cloud-modal{width:min(520px,100%);display:grid;gap:11px;padding:18px;border-radius:16px;background:#fff;box-shadow:0 24px 70px rgba(15,23,42,.3)}
.cloud-modal-head,.cloud-drawer-head{display:flex;justify-content:space-between;align-items:flex-start;gap:12px}.cloud-modal-head h2,.cloud-drawer-head h2{margin:0}.cloud-modal-head p,.cloud-drawer-head p{margin:4px 0 0;color:#718095;font-size:12px}
.cloud-auth-actions{display:grid;grid-template-columns:1fr 1fr 1fr;gap:8px;margin-top:10px}.cloud-user-card{display:grid;gap:4px;padding:14px;border-radius:10px;background:#eef8f2}.cloud-user-card span{color:#54705f;font-size:12px}
.cloud-library-drawer{position:fixed;z-index:290;top:0;right:0;width:min(480px,100vw);height:100dvh;padding:16px;background:#fff;box-shadow:-18px 0 55px rgba(15,23,42,.22);overflow:auto}
.cloud-library-tabs,.cloud-create-row{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin:12px 0}.cloud-library-tabs .active{background:#eaf2fc;color:#155cad;border-color:#8eb9eb}
.cloud-item-list{display:grid;gap:8px}.cloud-item{display:flex;justify-content:space-between;align-items:center;gap:8px;padding:10px;border:1px solid #dce5ef;border-radius:10px;background:#f9fbfd}.cloud-item strong,.cloud-item small{display:block}.cloud-item small{margin-top:3px;color:#7a8796;font-size:11px}.cloud-item-actions{display:flex;gap:5px}.cloud-empty{padding:20px;border:1px dashed #c5d1dd;border-radius:10px;text-align:center;color:#718095}
@media(max-width:700px){.cloud-sync-bar{justify-content:flex-start}.cloud-auth-actions,.cloud-library-tabs,.cloud-create-row{grid-template-columns:1fr}.cloud-item{align-items:flex-start;flex-direction:column}.cloud-item-actions{width:100%}.cloud-item-actions button{flex:1}}


/* ===== V3.0.1 Personal Web ===== */
.personal-header{
  min-height:78px;
  grid-template-columns:minmax(250px,390px) minmax(0,1fr);
}
.personal-toolbar{
  display:flex;
  align-items:center;
  justify-content:flex-end;
  gap:12px;
  min-width:0;
  flex-wrap:wrap;
}
.personal-main-actions{
  display:flex;
  align-items:center;
  justify-content:flex-end;
  gap:7px;
  flex-wrap:wrap;
}
.personal-main-actions>.button,
.personal-main-actions>.personal-more-menu>summary{
  min-height:39px;
  padding:8px 12px;
  white-space:nowrap;
}
.personal-more-menu{
  position:relative;
}
.personal-more-menu>summary{
  list-style:none;
  cursor:pointer;
}
.personal-more-menu>summary::-webkit-details-marker{display:none}
.personal-more-panel{
  position:absolute;
  z-index:240;
  top:calc(100% + 7px);
  right:0;
  width:190px;
  display:grid;
  gap:4px;
  padding:8px;
  border:1px solid #d6e0eb;
  border-radius:11px;
  background:#fff;
  box-shadow:0 16px 42px rgba(15,23,42,.2);
}
.menu-action{
  width:100%;
  display:block;
  padding:9px 10px;
  border:0;
  border-radius:8px;
  background:transparent;
  color:#263548;
  text-align:left;
  font:inherit;
  cursor:pointer;
}
.menu-action:hover{
  background:#eef4fb;
}
.personal-status-bar{
  min-height:34px;
  display:flex;
  align-items:center;
  gap:8px;
  padding:6px 18px;
  border-bottom:1px solid #dce4ed;
  background:#f8fafc;
  color:#617084;
  font-size:12px;
}
.personal-status-dot{
  width:9px;height:9px;
  flex:0 0 9px;
  border-radius:50%;
}
.personal-status-dot.saved{background:#28a25a}
.personal-status-dot.dirty{background:#e39a20}
.personal-status-dot.error{background:#cf3d3d}
.personal-status-bar .mini-button{
  margin-left:auto;
}
.personal-status-bar .mini-button + .mini-button{
  margin-left:0;
}

/* Personal Web 不再显示云端、登录和局域网连接界面。 */
.cloud-sync-bar,
.cloud-backdrop,
.cloud-library-drawer,
#ipadModalBackdrop{
  display:none!important;
}

@media(max-width:1050px){
  .personal-header{
    grid-template-columns:1fr;
  }
  .personal-toolbar{
    justify-content:flex-start;
  }
  .personal-main-actions{
    justify-content:flex-start;
  }
}
@media(max-width:720px){
  .personal-toolbar{
    display:grid;
    grid-template-columns:1fr;
    width:100%;
  }
  .personal-main-actions{
    display:grid;
    grid-template-columns:repeat(2,minmax(0,1fr));
    width:100%;
  }
  .personal-main-actions>.button,
  .personal-main-actions>.personal-more-menu,
  .personal-main-actions>.personal-more-menu>summary{
    width:100%;
    min-width:0;
  }
  .personal-more-panel{
    position:fixed;
    left:12px;
    right:12px;
    top:auto;
    bottom:calc(12px + env(safe-area-inset-bottom));
    width:auto;
  }
  .personal-status-bar{
    padding:6px 10px;
    flex-wrap:wrap;
  }
  .personal-status-bar #personalStatusText{
    flex:1;
    min-width:180px;
  }
}


/* ===== V3.1 Personal Cloud ===== */
.personal-header{grid-template-columns:minmax(250px,360px) auto minmax(0,1fr);gap:14px}
.workspace-nav{display:flex;align-items:center;gap:5px;padding:4px;border:1px solid #dfe7f1;border-radius:11px;background:#f5f8fc}
.workspace-nav-btn{min-height:36px;padding:7px 13px;border:0;border-radius:8px;background:transparent;color:#52647b;font-weight:800;cursor:pointer;white-space:nowrap}
.workspace-nav-btn.active,.workspace-nav-btn:hover{background:#fff;color:#1d5fbf;box-shadow:0 2px 8px rgba(34,80,130,.12)}
.personal-library-backdrop{position:fixed;inset:0;z-index:650;background:rgba(15,23,42,.42);display:flex;justify-content:flex-end}
.personal-library-backdrop[hidden]{display:none}
.personal-library-drawer{width:min(680px,94vw);height:100%;overflow:auto;background:#fff;box-shadow:-18px 0 48px rgba(15,23,42,.22);padding:18px}
.personal-library-header{display:flex;align-items:flex-start;justify-content:space-between;gap:16px;padding-bottom:14px;border-bottom:1px solid #e4eaf1}
.personal-library-header h2{margin:0;font-size:22px}.personal-library-header p{margin:5px 0 0;color:#708095;font-size:12px;line-height:1.5}
.personal-library-tabs{display:grid;grid-template-columns:repeat(3,1fr);gap:7px;margin:14px 0}
.personal-library-tab{padding:10px;border:1px solid #dce5ef;border-radius:9px;background:#f6f8fb;color:#55677d;font-weight:800;cursor:pointer}
.personal-library-tab.active{background:#286bd6;color:#fff;border-color:#286bd6}
.personal-library-panel{display:none}.personal-library-panel.active{display:block}
.library-panel-heading{display:flex;align-items:flex-start;justify-content:space-between;gap:14px;margin:12px 0}.library-panel-heading h3{margin:0}.library-panel-heading p{margin:4px 0 0;color:#718096;font-size:12px}
.recent-course-list,.course-history-list{display:grid;gap:9px}
.library-item-card{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:12px;border:1px solid #dfe7f0;border-radius:11px;background:#fbfcfe}
.library-item-main{display:grid;gap:4px;min-width:0}.library-item-main strong{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.library-item-main span{font-size:12px;color:#748399}
.library-item-actions{display:flex;gap:6px;flex:0 0 auto}.danger-lite{color:#b33b3b!important;background:#fff2f2!important}
.library-empty{padding:28px 14px;text-align:center;color:#7b8797;border:1px dashed #ccd7e3;border-radius:11px;background:#fafbfd}.library-empty[hidden]{display:none}
.offline-card{padding:15px;margin-bottom:12px;border:1px solid #dfe7f0;border-radius:12px;background:#f8fafc}.offline-card h3{margin:0 0 6px}.offline-card p{color:#65758a;line-height:1.55}.offline-state{margin:10px 0;padding:10px;border-radius:8px;background:#eef4fb;color:#35516f;font-size:13px}
body.personal-library-open{overflow:hidden}
@media(max-width:1180px){.personal-header{grid-template-columns:1fr}.workspace-nav{justify-content:flex-start;overflow:auto}.personal-toolbar{justify-content:flex-start}}
@media(max-width:720px){.workspace-nav{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));width:100%}.workspace-nav-btn{padding:7px 4px}.personal-library-drawer{width:100vw;padding:12px}.personal-library-tabs{grid-template-columns:1fr}.library-panel-heading,.library-item-card{align-items:stretch;flex-direction:column}.library-item-actions{display:grid;grid-template-columns:repeat(3,1fr)}}


/* ===== V3.1 Stable Core ===== */
.workspace-nav{
  display:flex;
  gap:6px;
  padding:4px;
  border:1px solid #dbe4ef;
  border-radius:12px;
  background:#f7f9fc;
}
.workspace-nav-btn{
  min-height:38px;
  padding:8px 14px;
  border:0;
  border-radius:9px;
  background:transparent;
  color:#43546a;
  font-weight:800;
  cursor:pointer;
}
.workspace-nav-btn.active{
  color:#fff;
  background:#2468d8;
  box-shadow:0 4px 12px rgba(36,104,216,.22);
}
.geometry-library{
  display:grid;
  gap:8px;
  margin:10px 0;
}
.geometry-library details{
  border:1px solid #dce5ef;
  border-radius:10px;
  background:#f9fbfd;
  overflow:hidden;
}
.geometry-library summary{
  padding:9px 10px;
  cursor:pointer;
  font-weight:800;
  color:#34465c;
}
.geometry-library .builder-presets{
  padding:0 8px 9px;
  grid-template-columns:repeat(2,minmax(0,1fr));
}
.json-import-pro-details{
  margin-top:14px;
  border:1px solid #cbd8eb;
  border-radius:12px;
  background:#f8fbff;
  overflow:hidden;
}
.json-import-pro-details>summary{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:10px;
  padding:12px 14px;
  cursor:pointer;
  font-weight:900;
  color:#244e8b;
}
.json-import-pro-details>summary small{
  color:#77879b;
  font-size:11px;
  font-weight:600;
}
.json-import-pro-details>*:not(summary){
  margin-left:12px;
  margin-right:12px;
}
.json-import-pro-details textarea{
  width:calc(100% - 24px);
  min-height:290px;
  margin-bottom:12px;
}
.json-pro-actions{
  display:grid;
  grid-template-columns:repeat(2,minmax(0,1fr));
  gap:8px;
  margin-top:10px;
}
.json-repair-report{
  margin-top:10px;
  padding:10px 12px;
  border-radius:9px;
  background:#eef3f8;
  color:#5d6b7b;
  font-size:12px;
  line-height:1.55;
}
.json-repair-report:empty{display:none}
.json-repair-report.success{
  background:#eefaf3;
  color:#247047;
}
.json-repair-report.error{
  background:#fff1f1;
  color:#a53030;
}
@media(max-width:1000px){
  .workspace-nav{order:3;width:100%;overflow:auto}
  .workspace-nav-btn{flex:1 0 auto}
}