:root{--ink:#203329;--muted:#68766c;--green:#245a3f;--soft:#edf3ed;--line:#dce4dc;--paper:#fff;--bg:#f5f7f3;--gold:#9a6a24;--danger:#a44132;font-family:Inter,"Microsoft YaHei","PingFang SC",system-ui,sans-serif;color:var(--ink);background:var(--bg);font-synthesis:none}
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@media(min-width:1450px){.map-stage,.model-stage{height:500px}.editor-grid{grid-template-columns:255px minmax(0,1fr)}}
@media(max-width:1100px){main{padding:25px 22px 0}.topbar{padding:15px 22px}.editor-grid{grid-template-columns:215px minmax(0,1fr);gap:12px}.canvas-grid{gap:10px;grid-template-columns:1fr 1fr}.model-card>header{padding:12px}.map-stage,.model-stage{height:370px;min-height:300px}.model-card header>span{display:none}.baseline-row>button{display:none}.principle-grid{gap:11px}.principle-grid article{padding:18px}.action-guide{gap:20px;padding:23px}.model-card footer{padding:8px 6px}}
@media(max-width:820px){.top-actions>span{display:none}.principle-grid{grid-template-columns:1fr 1fr}.action-guide{grid-template-columns:1fr 1fr}.physical-grid,.export-grid{grid-template-columns:1fr}.editor-grid{grid-template-columns:1fr}.controls{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px 15px}.controls>label{margin:0}.controls .variant-switch{grid-column:span 2}.controls>#variantHint{margin:0}.controls .control-divider{display:none}.controls>#axisHelp{grid-column:span 2;margin:0}.controls>.wide{margin:0}.controls .control-pair label{margin:0}.canvas-grid{grid-template-columns:1fr 1fr}.map-stage,.model-stage{height:390px}.course-tag{display:none}.comparison img{height:290px}}
@media(max-width:560px){body{font-size:13px}.topbar{padding:12px 15px;gap:10px}.brand small{font-size:7px}.brand-mark{width:31px;height:31px;font-size:11px}.brand{gap:8px;font-size:12px}.top-actions{gap:5px}.top-actions .quiet{font-size:10px;padding:6px}.top-actions #backupTop{display:none}main{padding:23px 15px 0}h1{font-size:26px}h2{font-size:21px}.page-head p{font-size:11px}.steps{gap:4px;margin:22px 0}.steps button{grid-template-columns:1fr;padding:8px 4px 11px}.steps button>span{font-size:13px;grid-row:auto}.steps button b{font-size:11px}.steps button small{font-size:8px}.section-heading{align-items:flex-start}.section-heading>button{font-size:10px;padding:8px}.principle-grid{gap:10px}.principle-grid article{padding:17px 15px;min-height:215px}.principle-grid h3{font-size:17px;margin-top:12px}.principle-grid p{font-size:12px}.action-guide{grid-template-columns:1fr;padding:23px}.action-guide article{border-top:1px solid #d1ddcd;padding-top:17px}.action-symbol{float:left;font-size:28px;margin-right:16px}.action-guide h3{font-size:15px}.action-intro h2 br{display:none}.physical-grid{gap:14px}.panel{padding:17px}.upload-area{min-height:220px}.editor-top{align-items:flex-start}.editor-top h2{font-size:19px}.product-switch button{min-width:60px;font-size:10px;padding:6px 8px}.controls{grid-template-columns:1fr 1fr;gap:13px}.controls .variant-switch{grid-column:span 2}.controls>#variantHint{grid-column:span 2;margin-top:-7px}.controls>#axisHelp{grid-column:span 2}.controls>.wide{font-size:11px}.canvas-grid{grid-template-columns:1fr}.map-stage{height:370px}.model-stage{height:400px}.model-card header>span{display:inline}.model-card footer{padding:9px 12px}.model-card footer button{font-size:11px}.baseline-picture{width:68px;min-width:68px;height:75px}.baseline-row{padding:12px;gap:11px}.baseline-row p{font-size:10px}.baseline-row b{font-size:11px}.comparison{gap:12px}.comparison article{padding:10px}.comparison header{font-size:11px}.comparison header span{font-size:9px}.comparison img{height:205px}.comparison p{font-size:10px;min-height:33px}.comparison button{font-size:10px;padding:7px}.page-footer{font-size:9px;gap:15px}.panel-heading h3{font-size:14px}.boundary-note{font-size:11px}.eyebrow{font-size:9px}}

.toast{pointer-events:none}.prompt-panel>.panel-heading+label{margin-top:16px}
.physical-product{display:flex;align-items:center;gap:18px;margin:-6px 0 18px}.physical-product .help{margin:0}
@media(max-width:560px){.comparison{grid-template-columns:1fr}.comparison img{height:330px}.comparison p{min-height:0}.comparison header,.comparison button{font-size:12px}}

/* Guided study stays above the editor, leaving the controls focused on geometry. */
.lesson-route{margin:20px 0;border:1px solid var(--line);border-radius:9px;background:#fff;padding:16px 20px;font-size:12px}
.lesson-route>summary,.study-history>summary{cursor:pointer;font-weight:650;color:var(--green)}
.lesson-route-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px;margin-top:20px}
.lesson-route-grid h3{font-size:14px}.lesson-route-grid p{font-size:12px}.lesson-route-grid small{color:var(--muted);font-size:11px}
.study-physical{margin-top:22px}.study-heading{display:flex;justify-content:space-between;align-items:center;gap:14px;margin-bottom:13px}.study-heading h3{margin:0}
.study-tag{font-size:11px;white-space:nowrap;color:var(--green);background:var(--soft);border:1px solid #d4dfd1;border-radius:30px;padding:4px 10px}
.study-copy{font-size:13px;max-width:1000px}.study-contact-row{display:flex;align-items:center;gap:20px;margin:18px 0}.study-contact-row>span{font-size:12px;font-weight:650}
.study-chips{display:flex;gap:8px;flex-wrap:wrap}.study-chip{font-size:12px;min-width:66px;padding:7px 15px;border-radius:30px}.study-chip[aria-pressed=true]{background:var(--green);border-color:var(--green);color:white}
.study-material{font-size:12px;padding:13px 16px;background:#f4f6f0;border-left:3px solid #92af7e;border-radius:0 7px 7px 0;margin-bottom:0}
.study-taskbar{background:#edf3e9;border:1px solid #d5e1cf;border-radius:10px;padding:18px 22px;margin-bottom:20px}
.study-task-summary{display:flex;justify-content:space-between;align-items:center;gap:25px}.study-task-summary>div:first-child{min-width:0}.study-task-summary h3{font-size:17px;margin:4px 0}.study-task-summary .help{margin:4px 0 10px}
.study-recommend{display:flex;align-items:center;justify-content:flex-end;gap:12px;flex-shrink:0;font-size:11px;color:var(--green)}.study-recommend button{font-size:12px;white-space:nowrap}
.study-prediction{display:grid;grid-template-columns:72px minmax(0,1fr);gap:12px;align-items:center;margin-top:5px}.study-prediction input{margin:0;background:#fff}
.study-taskbar>.help{margin:8px 0 0}.study-note{font-size:12px;line-height:1.75;color:#5e654c;background:#f5f4e9;border:1px solid #e5e4cc;border-radius:6px;padding:10px 13px;margin:12px 0}
.study-status{font-size:11px;line-height:1.65;color:var(--green);margin:10px 0 0;overflow-wrap:anywhere}.study-error{background:#fff0e9;color:#943d2e!important;border:1px solid #eec7ba;border-radius:7px;padding:10px 13px;font-size:12px;line-height:1.7}
.study-trial{margin:0 0 20px}.study-trial .study-heading{margin-bottom:12px}.study-trial .study-heading .eyebrow{display:block;margin-bottom:3px}
.study-fields{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px 22px;min-width:0;border:0;padding:0;margin:18px 0 0}.study-fields>label{display:block;min-width:0}.study-fields input,.study-fields select,.study-fields textarea{width:100%;min-width:0;margin-top:7px;font-size:12px}.study-full{grid-column:1/-1}
.study-fields:disabled{opacity:.62}.study-trial-actions{display:flex;align-items:center;gap:18px;margin:18px 0}.study-trial-actions>button{flex-shrink:0;font-size:12px}.study-trial-actions .help{margin:0;max-width:650px}
.study-history{border-top:1px solid var(--line);padding-top:14px;margin-top:18px;font-size:12px}.study-history>summary span{display:inline-block;min-width:22px;text-align:center;font-size:11px;margin-left:5px;background:var(--soft);border-radius:20px}
.study-record-list{display:grid;gap:9px;margin-top:12px}.study-record{border:1px solid var(--line);border-radius:7px;padding:12px 14px}.study-record>summary{display:flex;align-items:center;justify-content:space-between;gap:14px;cursor:pointer;list-style:none}.study-record>summary::before{content:'＋';color:var(--green)}.study-record[open]>summary::before{content:'−'}.study-record>summary>span{flex:1}.study-record-badge{color:var(--muted);font-size:10px;white-space:nowrap}.study-record-body{padding-top:12px;overflow-wrap:anywhere}.study-record-body p{margin:5px 0}.study-record-body strong{font-weight:600}.study-legacy-text{white-space:pre-wrap;overflow-wrap:anywhere;font:11px/1.7 inherit;max-height:240px;overflow:auto}.study-export-note{margin-bottom:0}
.study-visually-hidden{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
@media(max-width:1100px){.study-recommend{align-items:flex-end;flex-direction:column;gap:5px}.study-task-summary{gap:16px}}
@media(max-width:820px){.lesson-route-grid{grid-template-columns:1fr;gap:18px}.lesson-route-grid article+article{border-top:1px solid var(--line);padding-top:16px}.study-taskbar{padding:17px}.top-actions>#saveStatus.warn-status{display:block;max-width:180px;font-size:10px}.top-actions:has(.warn-status){flex-wrap:wrap}}
@media(max-width:560px){.study-physical{margin-top:14px}.study-heading{align-items:flex-start}.study-tag{white-space:normal;text-align:center;max-width:120px;font-size:10px}.study-contact-row{display:block}.study-chips{margin-top:10px;gap:7px}.study-chip{min-width:58px;padding:8px 12px}.study-task-summary{display:block}.study-recommend{flex-direction:row;align-items:center;justify-content:space-between;flex-wrap:wrap;margin:13px 0}.study-task-summary h3{font-size:16px}.study-prediction{display:block}.study-prediction input{margin-top:7px}.study-fields{grid-template-columns:1fr;gap:15px}.study-trial-actions{display:block}.study-trial-actions>button{width:100%;padding:10px}.study-trial-actions .help{margin-top:10px}.study-record>summary{flex-wrap:wrap;gap:6px 10px}.study-record-badge{margin-left:24px}.study-material{padding:12px}.lesson-route{padding:15px}.physical-product{align-items:flex-start;flex-wrap:wrap;gap:9px}.top-actions>#saveStatus.warn-status{max-width:135px}.study-fields input,.study-fields select,.study-fields textarea,.study-prediction input{font-size:16px}}

/* Place points where students can see the surface and its live prototype together. */
.arrangement-start{display:flex;align-items:center;justify-content:space-between;gap:18px;background:#fff;border:1px solid var(--line);border-radius:10px;padding:15px 17px;margin-bottom:14px}
.arrangement-start-copy{min-width:0}.arrangement-start-copy>div{display:flex;align-items:center;flex-wrap:wrap;gap:9px}.arrangement-start-copy b{font-size:13px}.arrangement-start-copy p{font-size:11px;line-height:1.75;color:var(--muted);margin:7px 0 0;max-width:520px}
.arrangement-mode{font-size:10px;font-weight:500;color:var(--green);background:var(--soft);border:1px solid #d7e2d1;border-radius:20px;padding:2px 9px}
.arrangement-start-actions{display:flex;flex-wrap:wrap;justify-content:flex-end;gap:8px;flex-shrink:0;max-width:360px}.arrangement-start-actions button{font-size:12px;padding:9px 12px;min-height:40px;white-space:nowrap}
.array-settings{margin-top:15px;border:1px solid var(--line);border-radius:7px;padding:10px 11px;background:#f9faf7;font-size:11px}.array-settings>summary{cursor:pointer;color:var(--green);font-weight:650}.array-settings label{margin-top:11px}.array-settings .help{font-size:10px;margin-bottom:0}
.model-card>.map-tools{display:flex;align-items:center;gap:5px;flex-wrap:wrap;padding:11px 12px 0;background:#fff}.model-card>.map-tools button{font-size:11px;min-height:36px;min-width:37px;padding:6px 11px;border-color:transparent;background:#f5f7f1}.model-card>.map-tools button.active{color:#fff;background:var(--green);border-color:var(--green)}
.model-card>.placement-hint{font-size:10px;line-height:1.7;color:var(--muted);padding:8px 14px 10px;margin:0;border-bottom:1px solid #e7ece4;min-height:36px;overflow-wrap:anywhere}
.model-card>.map-edit-actions{padding:10px 12px}.model-card>.map-edit-actions button{font-size:11px;min-height:36px;padding:6px 9px;border-color:var(--line)}.model-card>.map-edit-actions #clearPoints{color:var(--muted);border-color:transparent}
.canvas-grid>.model-card:not(.surface-card)>.model-stage{flex:1}
@media(max-width:1200px){.arrangement-start{align-items:flex-start;flex-direction:column;gap:12px}.arrangement-start-actions{max-width:none;justify-content:flex-start}.arrangement-start-copy p{max-width:none}}
@media(max-width:820px){.controls>.array-settings{grid-column:1/-1;margin:0}.array-settings[open]{display:grid;grid-template-columns:1fr 1fr;gap:0 16px}.array-settings>summary,.array-settings>.help{grid-column:1/-1}.controls .array-settings label{margin-top:10px}.arrangement-start{flex-direction:row;align-items:center}.arrangement-start-actions{flex-shrink:1;min-width:180px}.arrangement-start-actions button{width:100%;font-size:11px}.model-card>.map-tools{padding-left:9px;padding-right:9px}.model-card>.map-tools button{padding:6px 9px}}
@media(max-width:560px){.arrangement-start{display:block;padding:14px}.arrangement-start-actions{display:grid;grid-template-columns:1fr 1fr;margin-top:12px;gap:8px;min-width:0}.arrangement-start-actions button{white-space:normal;padding:9px 7px;line-height:1.5;font-size:11px}.arrangement-start-copy p{font-size:11px}.array-settings[open]{display:block}.model-card>.map-tools{padding:10px 12px 0;gap:6px}.model-card>.map-tools button{min-height:40px;min-width:40px;font-size:12px}.model-card>.placement-hint{font-size:11px;padding-top:8px}.model-card>.map-edit-actions button{font-size:12px;min-height:40px}.canvas-grid>.model-card:not(.surface-card)>.model-stage{flex:none}}

/* 版本保存 / 恢复 / 删除（2026-10-17） */
.editor-versions{margin-top:14px;border-top:1px solid var(--line);padding-top:10px}.editor-versions>b{font-size:12px}.version-stack{max-height:260px;overflow:auto}
.version-card{display:grid;grid-template-columns:minmax(0,1fr) auto auto;gap:6px;align-items:center;padding:7px 0;border-top:1px solid var(--line);font-size:12px}.version-card:first-child{border-top:0}.version-card b{display:block}.version-card small{display:block;color:var(--muted);font-size:11px}.version-card button{padding:4px 8px;font-size:11px}
.version-list .version-card{border:1px solid var(--line);border-radius:8px;padding:8px 10px;min-width:240px}

/* 顶部：同步 / 取回 / 导出作业（2026-10-17） */
.top-actions{flex-wrap:wrap}.top-actions .pxc-inline{margin:0}.top-actions .top-sync{border-color:var(--green);color:var(--green);font-weight:650}.top-actions .export-top{background:var(--green);border-color:var(--green);color:#fff;font-weight:650}
.l03-export-dialog{width:min(560px,calc(100vw - 32px));border:1px solid var(--line);border-radius:12px;padding:20px 22px;color:var(--ink)}.l03-export-dialog::backdrop{background:rgba(20,30,24,.35)}
.l03-export-head{display:flex;justify-content:space-between;align-items:center;gap:10px}.l03-export-head h2{font-size:16px;margin:0}.l03-export-dialog h3{font-size:13px;margin:14px 0 2px}.l03-export-dialog fieldset{border:1px solid var(--line);border-radius:9px;margin:12px 0;padding:8px 12px}.l03-export-dialog legend{font-size:12px;font-weight:650;padding:0 4px}
.l03-export-options{display:grid;gap:6px}.l03-export-options label{display:flex;gap:8px;align-items:flex-start;font-size:13px;cursor:pointer}.l03-export-options input{margin-top:4px}.l03-export-options small{display:block;color:var(--muted);font-size:11px}
.l03-export-options label{display:grid!important;grid-template-columns:auto 1fr;text-align:left;margin:0}.l03-export-options input{width:auto!important;height:auto;margin:4px 0 0!important;padding:0}

/* ───── v3：题目卡 + 三种材料（5mm 点 / 10mm 点 / 32.5×4mm 条） ───── */
.topic-guide{display:grid;grid-template-columns:minmax(220px,.9fr) 3fr;gap:26px;background:var(--soft);border-radius:12px;padding:28px;margin-top:22px}
.topic-intro p{font-size:12px;color:var(--muted);max-width:280px}
.topic-intro .topic-current{color:var(--green);font-weight:650;font-size:12px;background:#fff;border-radius:8px;padding:9px 12px;margin-top:14px}
.topic-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px}
.topic-col{display:flex;flex-direction:column;gap:8px}
.topic-col-head{display:flex;align-items:center;gap:8px;margin-bottom:2px}
.topic-col-head .action-symbol{float:none;display:grid;place-items:center;width:30px;height:30px;margin:0;border-radius:50%;background:var(--green);color:#fff;font-size:14px}
.topic-col.extra .topic-col-head .action-symbol{background:#6f8a63}
.topic-col-head b{font-size:12px;color:var(--green)}
.topic-card{display:flex;gap:9px;align-items:flex-start;text-align:left;background:#fff;border:1px solid #d8e2d4;border-radius:9px;padding:10px 11px;font-size:13px;font-weight:650;line-height:1.45;min-height:58px}
.topic-card .topic-no{flex:none;display:grid;place-items:center;width:22px;height:22px;border-radius:50%;background:#e3ecdf;color:var(--green);font-size:11px;font-weight:700}
.topic-card.active{border-color:var(--green);box-shadow:0 0 0 2px var(--green) inset;background:#f4f9f1}
.topic-card.active .topic-no{background:var(--green);color:#fff}
.topic-col.extra .topic-card{background:#fbfcfa;border-style:dashed}
.route-guide{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-top:16px}
.route-guide article{border:1px solid var(--line);border-radius:10px;background:#fff;padding:18px 20px}
.route-guide p{font-size:12px;color:var(--muted);margin:6px 0}
.route-guide small{font-size:10px;color:var(--green)}
.route-ico{display:flex;align-items:center;gap:6px;height:26px;margin-bottom:8px}
.route-ico i,.mat-ico,.tool-ico{display:inline-block;flex:none}
.ri-s,.mi-s{width:9px;height:9px;border-radius:50%;background:#6e8c64}
.ri-b,.mi-b{width:18px;height:18px;border-radius:50%;background:var(--green)}
.ri-l,.mi-l{width:42px;height:7px;border-radius:3px;background:#b86b1e}
.material-box{border:1px solid #d8e2d4;background:#f8fbf6;border-radius:9px;padding:11px 12px;margin:10px 0}
.material-box>b{display:block;font-size:12px;margin-bottom:6px}
.material-box>b small{font-weight:500;color:var(--muted);margin-left:4px}
.material-box .route-label{color:var(--green);font-weight:650}
.mat-row{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:8px}
.mat-row label{display:grid;grid-template-columns:auto 1fr;align-items:center;column-gap:6px;row-gap:5px;margin:0;padding:0;font-size:11px;color:var(--muted);font-weight:600}
.mat-row input{grid-column:1/-1}
.controls .mat-row{grid-template-columns:1fr;gap:6px}
.controls .mat-row label{grid-template-columns:30px 1fr 64px}
.controls .mat-row input{grid-column:auto;padding:5px 7px}
.controls .material-box label{margin-top:0}
.mat-row .mi-l{width:30px;height:5px}
.mat-row input{width:100%;min-width:0;padding:6px 8px}
.material-box .help{margin:8px 0 0}
.warn-text{color:var(--danger)!important}
.map-tools .tool-ico{margin-right:5px;vertical-align:middle}
.map-tools .mi-s{width:7px;height:7px}.map-tools .mi-b{width:12px;height:12px}.map-tools .mi-l{width:20px;height:5px}
.map-tools button.active .mi-s,.map-tools button.active .mi-b,.map-tools button.active .mi-l{outline:1.5px solid #fff}
.selected-box{border:1px solid #e3cfb3;background:#fdf8f1;border-radius:9px;padding:10px 12px;margin:10px 0}
.selected-box b{font-size:12px;color:#8a5a1d}
.rotate-row{display:grid;grid-template-columns:auto 1fr auto;gap:8px;align-items:end;margin-top:6px}
.rotate-row label{margin:0;font-size:11px}
.rotate-row input{width:100%;min-width:0;padding:6px 8px}
.selected-box .help{margin:6px 0 0}
.study-fields .study-full.help{margin:0}
@media(max-width:1100px){.topic-guide{grid-template-columns:1fr}.topic-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:820px){.route-guide{grid-template-columns:1fr}}
@media(max-width:560px){.topic-guide{padding:20px 16px}.topic-grid{grid-template-columns:1fr}.mat-row{grid-template-columns:repeat(3,minmax(0,1fr));gap:6px}}
/* v3.1：进度提醒、触屏友好 */
.todo-bar{display:flex;flex-wrap:wrap;align-items:center;gap:8px 10px;margin:14px 0 0;padding:11px 14px;border:1px solid #e3dcc8;background:#fffcf4;border-radius:10px;font-size:12px}
.todo-bar>b{color:var(--ink);font-size:12px}
.todo-meter{position:relative;width:90px;height:6px;border-radius:3px;background:#ece6d4;overflow:hidden}
.todo-meter i{position:absolute;inset:0 auto 0 0;background:var(--green);border-radius:3px}
.todo-label{color:var(--gold);font-weight:650}
.todo-done{color:var(--green);font-weight:650}
.todo-chip{padding:4px 10px;border-radius:999px;font-size:12px;border-color:#e2cfa6;background:#fff;color:#7a5418}
.todo-chip:hover:not(:disabled){background:#fbf3e2;border-color:#c9a35f}
.todo-bar small{flex-basis:100%;color:var(--muted);font-size:11px}
.steps button{position:relative}
.todo-dot{position:absolute;top:6px;right:8px;min-width:17px;height:17px;padding:0 4px;border-radius:9px;background:#e9a23b;color:#fff;font-style:normal;font-size:10px;line-height:17px;text-align:center;font-weight:700}
.danger-quiet{color:var(--danger);border-color:#ecd2cc}
.map-edit-actions{flex-wrap:wrap;gap:6px}
@media(max-width:820px){.controls .material-box,.controls .selected-box,.controls .control-pair,.controls .editor-versions,.controls>#materialStatus{grid-column:1/-1}.controls .material-box{margin:0}.controls .mat-row{grid-template-columns:repeat(3,minmax(0,1fr))}.controls .mat-row label{grid-template-columns:auto 1fr}.controls .mat-row input{grid-column:1/-1}}
@media(max-width:560px){.todo-bar{margin-top:10px;padding:10px 12px}.todo-meter{width:60px}.todo-dot{top:2px;right:2px}.map-tools{flex-wrap:wrap}.map-tools button{min-height:36px}.map-edit-actions button{min-height:36px}}
@media(pointer:coarse){.map-tools button,.map-edit-actions button,.rotate-row button,.todo-chip{min-height:40px}}
/* v3.2：排列工具 */
.arrange-bar{display:flex;flex-direction:column;gap:6px;padding:8px 14px 10px;border-bottom:1px solid var(--line);background:#fbfcfa}
.arr-row{display:flex;flex-wrap:wrap;align-items:center;gap:5px}
.arr-row>b{font-size:12px;margin-right:4px;min-width:62px}
.arrange-bar button{padding:4px 9px;font-size:12px;border-radius:6px}
.arr-tag{font-size:11px;color:var(--green);font-weight:700;margin:0 2px 0 6px}
.arr-row .arr-tag:first-child{margin-left:0}
.arr-check{display:inline-flex;align-items:center;gap:4px;font-size:12px;font-weight:500;padding:0;margin:0}
.arr-check input{margin:0}
.arr-num{display:inline-flex;align-items:center;gap:4px;font-size:11px;font-weight:500;color:var(--muted);padding:0;margin:0 0 0 4px}
.arr-num input{width:56px;padding:4px 6px}
#snapStep{padding:4px 6px;font-size:12px}
@media(max-width:560px){.arrange-bar{padding:8px 10px}.arrange-bar button{padding:6px 9px}.arr-row .spacer{flex-basis:100%;height:0}}
@media(pointer:coarse){.arrange-bar button{min-height:36px}}
.arr-more{display:flex;flex-direction:column;gap:6px}
.arr-more>summary{cursor:pointer;font-size:12px;font-weight:650;color:var(--green);padding:2px 0}
.arr-more[open]>summary{margin-bottom:4px}
.arr-more .arr-row+.arr-row{margin-top:6px}

/* ───── 紧凑版（2026-10-19）：同屏多看一步，减少空白与重复说明 ───── */
main{padding-top:18px}
html body #puxinToolActions{display:grid;grid-template-columns:auto minmax(140px,210px) minmax(110px,160px) minmax(0,1fr);gap:6px 14px;align-items:end;padding:12px 18px;margin-bottom:0}
html body #puxinToolActions h2{font-size:14px;margin:0 0 8px;white-space:nowrap}
html body #puxinToolActions .pta-fields{display:contents}
html body #puxinToolActions .pta-fields label{font-size:12px;margin:0}
html body #puxinToolActions .pta-fields input{padding:6px 10px;min-height:0;height:34px}
html body #puxinToolActions .pta-buttons{display:flex;flex-wrap:wrap;justify-content:flex-end;gap:6px}
html body #puxinToolActions .pta-buttons button{padding:7px 12px;font-size:12.5px;min-height:34px}
html body #puxinToolActions .pta-help{display:none}
html body #puxinToolActions .pta-status{grid-column:1/-1;margin:0}
html body #puxinToolActions .pta-status:empty{display:none}
.page-head h1{font-size:28px;margin:2px 0}
.page-head p{margin:0}
.steps{margin:12px 0 14px}
.steps button{padding-top:10px;padding-bottom:10px}
.todo-bar{margin:0 0 14px;padding:8px 12px}
.section-heading,.editor-top{margin-bottom:14px}
.section-heading h2,.editor-top h2{margin:2px 0}
/* 01 触觉思路：四个问题收成一条，题目卡是主角 */
.principle-grid{gap:10px}
.principle-grid article{min-height:0;padding:12px 14px;display:grid;grid-template-columns:auto 1fr;column-gap:10px;align-items:baseline}
.principle-grid .principle-number{font-size:20px;grid-row:span 3}
.principle-grid h3{font-size:15px;margin:0 0 3px}
.principle-grid p{font-size:12px;margin:0 0 4px;line-height:1.55}
.principle-grid small{font-size:11px}
.topic-guide{padding:16px 18px;gap:18px;margin-top:12px}
.topic-intro h2{font-size:20px}
.topic-card{min-height:46px;padding:8px 10px}
.route-guide{gap:10px;margin-top:10px}
.route-guide article{padding:10px 14px}
.route-guide h3{margin:4px 0 2px;font-size:15px}
.route-guide p{margin:0 0 2px;font-size:12px}
.boundary-note{margin:12px 0;padding:10px 14px}
.lesson-route{margin:12px 0;padding:10px 16px}
/* 02 实物证据：题目与动作在上，卡纸和记录居中，实测紧跟其后 */
.study-physical{margin:0 0 14px;padding:14px 18px}
.study-physical .study-material,.study-physical .study-material + .help{display:none}
.physical-product{margin-bottom:12px}
.upload-area{min-height:200px;margin:12px 0}
.evidence-form label{margin-bottom:12px}
.study-trial{margin:14px 0 0}
/* 03 原型编辑 */
.study-taskbar{padding:12px 18px;margin-bottom:14px}
.arrangement-start{padding:10px 14px;margin-bottom:10px}
/* 04 对照与导出 */
.comparison img{height:250px;margin:6px 0}
.comparison article{padding:14px 18px}
.page-footer{padding:16px 0 14px;margin-top:16px}
@media(max-width:900px){html body #puxinToolActions{grid-template-columns:1fr 1fr}html body #puxinToolActions h2,html body #puxinToolActions .pta-buttons{grid-column:1/-1}html body #puxinToolActions .pta-buttons{justify-content:flex-start}.principle-grid article{grid-template-columns:1fr}.principle-grid .principle-number{grid-row:auto}}
.physical-grid{align-items:start}
.physical-left{display:flex;flex-direction:column;gap:14px;min-width:0}
.physical-left .study-trial{margin:0}
.photo-panel .compact-list{margin-bottom:0}
/* 02：题目只在「触觉思路」选，这里只显示；选做题才问动作 */
.topic-summary{display:flex;align-items:center;justify-content:space-between;gap:10px;background:var(--soft);border-radius:8px;padding:9px 12px;margin-bottom:12px;font-size:13px;font-weight:650;color:var(--green)}
.topic-summary button{white-space:nowrap;padding:5px 10px;font-size:12px}
/* 03：分布编辑那一栏放宽，工具不再折行 */
.canvas-grid{grid-template-columns:minmax(0,1.12fr) minmax(0,.88fr)}
.arr-check{white-space:nowrap}
@media(max-width:1100px){.canvas-grid{grid-template-columns:1fr 1fr}}
@media(max-width:560px){.canvas-grid{grid-template-columns:1fr}}