:root{font-family:"Microsoft YaHei","PingFang SC","Noto Sans CJK SC",sans-serif;color:#283f37;background:#f7f8f3;font-synthesis:none;--ink:#283f37;--muted:#5e7168;--forest:#24685b;--forest-dark:#174f44;--forest-pale:#eaf3ee;--coral:#b34d39;--coral-pale:#faeee8;--line:#dce4dc;--paper:#fffefa;--radius:14px;--focus:#a94d25;--shadow:0 18px 56px #1e392c20}
*{box-sizing:border-box}body{margin:0;min-width:320px}button,input,select{font:inherit;color:inherit}button,a,input,select{touch-action:manipulation}button{min-height:44px;border:1px solid var(--line);border-radius:9px;background:#fffefa;padding:10px 13px;font-size:14px;font-weight:600;line-height:1.35;cursor:pointer;display:inline-flex;align-items:center;justify-content:center;gap:7px;transition:background-color .16s,border-color .16s,color .16s}button:hover{background:var(--forest-pale);border-color:#9ebbae}button:active{background:#dbeadf}button:disabled{opacity:.42;cursor:not-allowed}button:disabled:hover{background:inherit;border-color:var(--line)}button svg,.back-link svg,.file-picker>svg{width:20px;height:20px;flex:0 0 auto;fill:none;stroke:currentColor;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round}button.primary-button{background:var(--forest);border-color:var(--forest);color:#fff}button.primary-button:hover{background:var(--forest-dark);border-color:var(--forest-dark)}button.coral-button{background:var(--coral);border-color:var(--coral);color:#fff}button.coral-button:hover{background:#963c2d;border-color:#963c2d}button.soft-button{background:var(--forest-pale);color:var(--forest);border-color:transparent}button.quiet-button{background:transparent;border-color:transparent}button.quiet-button:hover{background:#edf2eb;border-color:transparent}button.icon-button{width:44px;padding:10px;flex:0 0 44px}button.active,button[aria-pressed="true"],button.is-selected{background:var(--forest-pale);border-color:var(--forest);color:var(--forest-dark)}button[data-dir-selection="true"]{background:var(--forest-pale);border-color:var(--forest)}[hidden]{display:none!important}:focus-visible{outline:3px solid var(--focus);outline-offset:3px}::selection{color:#173e31;background:#f1d6b8}input{accent-color:var(--forest);caret-color:var(--forest)}input[type="number"],select{min-height:44px;background:#fffefa;border:1px solid #bdcdc1;border-radius:8px;padding:8px 10px;max-width:100%;font-variant-numeric:tabular-nums}input[type="checkbox"],input[type="radio"]{width:17px;height:17px;flex:0 0 auto;cursor:pointer}input:disabled,select:disabled{opacity:.5}h1,h2,h3,p,figure{margin:0}h1,h2,h3{font-weight:700}a{color:var(--forest);text-underline-offset:4px}svg text{font-family:inherit}*{scrollbar-width:thin;scrollbar-color:#bccbc0 #f3f5ef}
.topbar{min-height:76px;background:var(--paper);border-bottom:1px solid var(--line);padding:12px 28px;display:flex;align-items:center;gap:24px}.back-link{display:inline-flex;align-items:center;gap:3px;min-height:44px;text-decoration:none;font-size:14px;white-space:nowrap;color:var(--muted)}.back-link:hover{color:var(--forest)}.topbar h1{font-size:24px;letter-spacing:.04em;white-space:nowrap}.header-caption{font-size:14px;color:var(--muted);padding-left:18px;border-left:1px solid var(--line)}.header-actions{display:flex;align-items:center;gap:6px;margin-left:auto}.app-layout{display:grid;grid-template-columns:minmax(0,1fr) 360px;gap:24px;padding:24px 28px 0;max-width:1920px;margin:0 auto;align-items:start}.board-panel{min-width:0;background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden}.board-heading{display:flex;align-items:center;justify-content:space-between;gap:20px;padding:24px 26px 18px}.task-copy{min-width:0}.task-copy h2{font-size:22px;line-height:1.5;letter-spacing:.015em;text-wrap:balance}.task-copy p{margin-top:7px;font-size:14px;line-height:1.7;color:var(--muted)}.goal-figure{flex:0 0 80px;text-align:center}.goal-figure img{display:block;width:72px;height:72px;margin:0 auto;object-fit:contain;border:1px solid #e1e4d7;background:#f8f2e5;border-radius:5px}.goal-figure img:not([src]){visibility:hidden}.goal-figure figcaption{font-size:11px;color:var(--muted);margin-top:5px}.view-toolbar{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:8px;padding:3px 18px 10px}.display-options{display:flex;align-items:center;flex-wrap:wrap;gap:16px;padding-left:5px}.display-options label{font-size:13px;display:inline-flex;align-items:center;gap:6px;min-height:44px;cursor:pointer;white-space:nowrap}.view-actions{display:flex;align-items:center;gap:2px}.view-actions button{font-size:12px;padding-left:9px;padding-right:9px}.view-actions .icon-button{width:42px;flex-basis:42px}.board-wrap{position:relative;width:100%;aspect-ratio:7/5;min-height:390px;background:#fdfdf8;border-top:1px solid #e8ece3;border-bottom:1px solid #e8ece3;isolation:isolate;overflow:hidden}#board{display:block;width:100%;height:100%;min-height:390px;touch-action:none;user-select:none;-webkit-user-select:none}#board:focus-visible{outline-offset:-4px}#board image{pointer-events:none}#board [data-piece]{cursor:pointer}#board [data-piece]:focus,#pivot-preview [data-corner]:focus{outline:none}#board [data-piece]:focus-visible>rect{stroke:var(--focus);stroke-width:3;vector-effect:non-scaling-stroke}#pivot-preview [data-corner]:focus-visible>circle:nth-of-type(2){stroke:var(--focus);stroke-width:3;vector-effect:non-scaling-stroke}.board-statusbar{display:flex;align-items:center;gap:9px;padding:12px 22px;background:#f5f8f1;min-height:45px}.status-dot{width:6px;height:6px;border-radius:50%;background:#6b8f78;flex:0 0 auto}#board-status{color:#4d6658;font-size:13px;line-height:1.6}.playback-toolbar{display:flex;align-items:center;flex-wrap:wrap;gap:8px 16px;padding:18px 20px}.playback-main,.playback-secondary{display:flex;align-items:center;flex-wrap:wrap;gap:7px}.playback-main button{padding-left:13px;padding-right:13px}.playback-secondary{margin-left:auto}.speed-control{display:flex;align-items:center;gap:8px;color:var(--muted);font-size:13px}.speed-control select{font-size:13px;min-width:76px}.result:not(:empty){margin:0 20px 18px;padding:14px 16px;border-radius:9px;background:var(--forest-pale);color:var(--forest-dark);font-size:14px;line-height:1.7}.result.error,.result.is-error{background:var(--coral-pale);color:#954130}.command-panel{min-width:0;background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden}.command-panel>section,.command-panel>form{padding:21px 20px}.command-panel>section+section,.command-panel>form,.command-panel>form+section{border-top:1px solid var(--line)}.section-heading{display:flex;align-items:center;gap:8px;justify-content:space-between;margin-bottom:16px}.section-heading h2{font-size:16px;line-height:1.4}.section-hint{font-size:12px;color:var(--muted)}.selected-name{font-size:12px;font-weight:600;color:var(--forest);background:var(--forest-pale);border-radius:5px;padding:5px 8px}.count-label{font-size:12px;font-variant-numeric:tabular-nums;color:var(--muted)}#piece-palette{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:8px}#piece-palette>button{min-width:0;min-height:75px;padding:6px;display:flex;flex-direction:column;gap:5px;font-size:11px;border-radius:8px}#piece-palette>button img,#piece-palette>button svg{width:48px;height:48px;max-width:100%;object-fit:contain;display:block;flex:none}#piece-palette>button.active,#piece-palette>button[aria-pressed="true"]{background:var(--forest-pale);border-width:2px;padding:5px}.mode-switch{display:grid;grid-auto-flow:column;grid-auto-columns:minmax(0,1fr);background:#edf1e9;padding:4px;gap:4px;border-radius:10px;margin-bottom:17px}.mode-switch button{border:0;border-radius:7px;background:transparent;min-height:42px}.mode-switch button.active,.mode-switch button[aria-pressed="true"]{background:var(--paper);color:var(--forest);box-shadow:0 2px 5px #2042330a}.field-title{display:block;font-size:13px;color:var(--muted);margin-bottom:9px}.direction-buttons{display:grid;grid-template-columns:repeat(4,1fr);gap:7px}.direction-buttons button{padding:8px;gap:3px}.direction-buttons svg{width:17px;height:17px}.distance-field{display:flex;align-items:center;justify-content:space-between;margin-top:17px;gap:12px;font-size:14px}.input-unit{display:flex;align-items:center;gap:9px;color:var(--muted)}#move-distance{width:88px;text-align:center;color:var(--ink)}.builder-stage{font-size:12px;line-height:1.6;color:var(--muted);margin-bottom:10px}.pivot-builder{display:grid;grid-template-columns:118px minmax(0,1fr);gap:14px;align-items:center}#pivot-preview{display:block;width:118px;height:118px;border-radius:9px;background:#f4f4eb;touch-action:manipulation}#corner-buttons{display:grid;grid-template-columns:1fr 1fr;gap:6px}#corner-buttons button{font-size:12px;padding:7px 4px;min-height:44px;white-space:normal}.rotation-fields{display:grid;grid-template-columns:1.15fr 1fr;gap:10px;margin-top:14px}.rotation-fields label,.split-dimensions label{display:flex;flex-direction:column;gap:7px;font-size:12px;color:var(--muted)}.rotation-fields select,.rotation-fields input{width:100%;min-width:0;font-size:14px;color:var(--ink)}.field-description{font-size:12px;line-height:1.7;color:var(--muted);margin-top:10px}.builder-actions{display:flex;gap:8px;margin-top:19px}.builder-actions #add-command{flex:1}.builder-actions #cancel-edit{font-size:12px;padding:8px}.program-section .section-heading{margin-bottom:13px}#program-list{list-style:none;padding:0;margin:0;display:grid;gap:7px;counter-reset:command;max-height:380px;overflow:auto;overscroll-behavior:contain}#program-list:empty{display:none}#program-list>li{counter-increment:command;display:flex;flex-wrap:wrap;align-items:center;gap:7px;padding:10px 9px;border:1px solid var(--line);border-radius:9px;background:#fafbf6;font-size:12px;line-height:1.6;position:relative;min-width:0}#program-list .command-index,.command-number{display:inline-flex;align-items:center;justify-content:center;width:23px;height:23px;flex:0 0 23px;border-radius:5px;background:#e9eee5;color:#526a5b;font-size:11px;font-variant-numeric:tabular-nums}.command-text,.command-main{flex:1;min-width:0;overflow-wrap:anywhere}.command-text strong{color:var(--forest-dark)}.command-actions{display:flex;gap:2px;align-items:center;justify-content:flex-end;width:100%}#program-list button{min-width:42px;min-height:42px;padding:6px;border:0;background:transparent;font-size:12px}#program-list button:hover{background:#e8eee3}#program-list button svg{width:16px;height:16px}#program-list>li.is-current,#program-list>li.current,#program-list>li.active{background:#fff0e6;border-color:#c77653;box-shadow:inset 0 0 0 1px #c77653}#program-list>li.is-done,#program-list>li.done{background:#eff5ec;border-color:#adc5ac}#program-list>li.is-editing,#program-list>li.editing{border-color:var(--forest);background:var(--forest-pale)}.queue-empty{padding:22px 15px;background:#f4f6ee;border-radius:9px;color:#4a6453;font-size:13px;line-height:1.9;text-align:center}.queue-empty span{font-size:12px;color:var(--muted)}.program-actions{display:grid;grid-template-columns:1fr 1fr;gap:7px;margin-top:14px}.program-actions #confirm-program,.program-actions #edit-program{grid-column:1/-1}.program-actions .quiet-button{font-size:12px}#program-note{display:block;font-size:12px;line-height:1.75;color:var(--muted);margin-top:10px}.page-footer{padding:18px 28px 22px;color:#5e7168;font-size:12px;text-align:center}dialog{width:min(600px,calc(100vw - 32px));max-height:calc(100dvh - 40px);border:0;border-radius:16px;padding:28px;color:var(--ink);background:var(--paper);box-shadow:var(--shadow);overflow:auto}dialog::backdrop{background:#1d302c66;backdrop-filter:blur(3px)}.dialog-heading{display:flex;align-items:flex-start;justify-content:space-between;gap:15px;margin-bottom:23px}.dialog-heading h2{font-size:22px;line-height:1.5;text-wrap:balance}.dialog-heading p{font-size:13px;line-height:1.7;color:var(--muted);margin-top:6px}.dialog-heading>.icon-button{margin:-7px -9px 0 0;border-color:transparent;background:transparent}.dialog-actions{display:flex;justify-content:flex-end;flex-wrap:wrap;gap:9px;margin-top:23px}.custom-form{margin:0}.file-picker{position:relative;display:flex;align-items:center;justify-content:center;gap:8px;width:100%;min-height:65px;padding:12px 18px;border:1px dashed #94ad99;border-radius:10px;background:#f2f7ee;color:var(--forest);font-size:14px;font-weight:600;cursor:pointer}.file-picker:hover{background:#e9f2e3}.file-picker:focus-within{outline:3px solid var(--focus);outline-offset:3px}#image-file{position:absolute;inset:0;opacity:0;width:100%;height:100%;cursor:pointer}.upload-preview-wrap{margin-top:14px;text-align:center}#upload-preview{display:block;width:100%;height:230px;object-fit:contain;background:#f1f2eb;border-radius:9px}#image-meta{margin:8px 0 0;color:var(--muted);font-size:12px;line-height:1.7;overflow-wrap:anywhere}.split-fieldset{border:0;padding:0;margin:24px 0 0;min-width:0}.split-fieldset legend{font-weight:700;font-size:15px;padding:0;margin-bottom:12px}.split-options{display:flex;flex-wrap:wrap;gap:8px}.split-options label{display:flex;align-items:center;gap:7px;flex:1;min-height:44px;min-width:120px;border:1px solid var(--line);padding:8px 11px;border-radius:8px;font-size:13px;cursor:pointer}.split-options label:has(input:checked){border-color:var(--forest);background:var(--forest-pale)}.split-dimensions{display:flex;align-items:flex-end;gap:14px;margin-top:14px}.split-dimensions label{flex:1}.split-dimensions>span{align-self:flex-end;line-height:44px;font-size:17px;color:var(--muted)}.split-dimensions select{width:100%;color:var(--ink)}.help-steps{margin:0;padding:0 0 0 24px}.help-steps li{padding-left:5px;margin-top:20px;color:var(--forest)}.help-steps li::marker{font-weight:700;font-variant-numeric:tabular-nums}.help-steps strong{font-size:15px;color:var(--ink)}.help-steps p{margin-top:6px;font-size:13px;line-height:1.85;color:var(--muted)}.help-import{margin-top:24px;padding:14px 16px;font-size:13px;line-height:1.85;background:#f1f5eb;border-radius:9px;color:#4d6556}#toast{position:fixed;left:50%;bottom:24px;transform:translateX(-50%);max-width:min(560px,calc(100vw - 32px));padding:12px 19px;border-radius:10px;background:var(--forest-dark);color:white;box-shadow:0 6px 20px #153b2733;font-size:14px;line-height:1.6;z-index:100;pointer-events:none;text-align:center}#toast:empty{display:none}
@media(min-width:1600px){.app-layout{grid-template-columns:minmax(0,1fr) 380px;gap:28px}.board-wrap{max-height:760px}.task-copy h2{font-size:24px}.command-panel>section,.command-panel>form{padding:24px}}
@media(max-width:1190px){.topbar{padding:12px 20px;gap:17px}.header-caption{display:none}.app-layout{padding:20px 20px 0;gap:18px;grid-template-columns:minmax(0,1fr) 340px}.board-heading{padding:22px 20px 16px;gap:12px}.task-copy h2{font-size:20px}.goal-figure{flex-basis:66px}.goal-figure img{width:60px;height:60px}.view-toolbar{padding-left:14px;padding-right:12px}.display-options{gap:12px}.board-wrap,#board{min-height:420px}.playback-toolbar{padding:15px;gap:10px}.playback-main{gap:6px}.playback-main button{font-size:13px;padding:9px 10px}.playback-secondary{margin-left:0}.command-panel>section,.command-panel>form{padding:19px 17px}}
@media(max-width:960px){.app-layout{grid-template-columns:minmax(0,1fr)}.command-panel{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);align-items:start}.piece-section{grid-column:1}.command-panel>.builder-section{grid-column:1;border-top:1px solid var(--line)}.command-panel>.program-section{grid-column:2;grid-row:1/3;border-top:0;border-left:1px solid var(--line);height:100%}.board-wrap{min-height:400px;max-height:650px;aspect-ratio:7/4.5}#board{min-height:400px}.playback-secondary{margin-left:auto}#piece-palette>button{min-height:70px}#program-list{max-height:530px}}
@media(max-width:640px){.topbar{min-height:68px;padding:10px 14px;gap:12px;flex-wrap:wrap}.back-link{font-size:12px;gap:0}.back-link svg{width:16px}.topbar h1{font-size:20px;margin-right:auto}.header-actions{margin-left:0;gap:2px;flex:1 1 auto;justify-content:flex-end}.header-actions button{font-size:12px;padding:8px 10px}.header-actions #fullscreen{padding:8px;width:42px}.header-actions #fullscreen span{display:none}.header-actions #custom-open svg{width:17px}.app-layout{padding:14px 10px 0;gap:14px}.board-panel,.command-panel{border-radius:12px}.board-heading{padding:18px 15px 13px;gap:10px}.task-copy h2{font-size:18px;line-height:1.5}.task-copy p{font-size:12px;line-height:1.7;margin-top:6px}.goal-figure{flex-basis:59px}.goal-figure img{width:54px;height:54px}.goal-figure figcaption{font-size:11px}.view-toolbar{padding:0 10px 9px;gap:0}.display-options{gap:12px;padding-left:3px;width:100%}.display-options label{font-size:12px;min-height:42px}.view-actions{margin-left:auto}.view-actions button{min-height:42px;font-size:12px}.board-wrap{aspect-ratio:7/6;min-height:320px;max-height:none}#board{min-height:320px}.board-statusbar{padding:11px 13px;align-items:flex-start}.status-dot{margin-top:7px}#board-status{font-size:12px}.playback-toolbar{padding:13px 12px;gap:10px}.playback-main{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));width:100%;gap:5px}.playback-main button{font-size:12px;padding:9px 3px;gap:2px}.playback-main button svg{width:15px}.playback-secondary{margin-left:auto;gap:0}.playback-secondary button{font-size:12px;padding:9px 7px}.speed-control{font-size:12px;gap:5px}.speed-control select{font-size:12px;min-width:65px;padding:7px}.result:not(:empty){margin:0 12px 13px;padding:12px;font-size:13px}.command-panel{display:block}.command-panel>.program-section{border-left:0;border-top:1px solid var(--line)}.command-panel>section,.command-panel>form{padding:20px 18px}.section-heading h2{font-size:16px}.section-hint{font-size:12px}#piece-palette{gap:9px}#piece-palette>button{min-height:83px}#piece-palette>button img,#piece-palette>button svg{width:53px;height:53px}#program-list{max-height:none}.pivot-builder{grid-template-columns:130px minmax(0,1fr);gap:18px}#pivot-preview{width:130px;height:130px}#corner-buttons button{font-size:13px}.page-footer{padding:17px 14px 22px;font-size:11px}dialog{padding:22px 18px;max-height:calc(100dvh - 24px);width:calc(100vw - 24px);border-radius:13px}.dialog-heading h2{font-size:20px}.dialog-heading p{font-size:12px}.dialog-heading>.icon-button{margin-right:-4px}.dialog-actions{gap:7px}.dialog-actions button{font-size:13px}.upload-preview-wrap #upload-preview{height:200px}.help-steps{padding-left:21px}#toast{bottom:16px;font-size:13px}}
/* Keep the drawing broad while keeping classroom controls within reach. */
@media(min-width:961px){
  .board-heading{padding-top:18px;padding-bottom:13px}
  .goal-figure img{width:60px;height:60px}
  .goal-figure figcaption{font-size:11px}
  .board-wrap{height:clamp(420px,calc(100dvh - 430px),720px);min-height:420px;max-height:none;aspect-ratio:auto}
  #board{min-height:0}
  .command-panel{display:flex;flex-direction:column;max-height:calc(100dvh - 120px)}
  .command-panel>.piece-section,.command-panel>.builder-section{flex:0 0 auto;padding-top:13px;padding-bottom:13px}
  .command-panel>.program-section{display:flex;flex-direction:column;flex:1 1 auto;min-height:0;padding-top:17px;padding-bottom:17px;overflow:hidden}
  .program-section>.section-heading,.program-section>.program-actions,.program-section>#program-note{flex:0 0 auto}
  #program-list{min-height:0;max-height:none;flex:0 1 auto;overflow:auto;scroll-padding:8px}
  .queue-empty{padding-top:16px;padding-bottom:16px;flex:0 1 auto}
  .piece-section .section-heading{margin-bottom:10px}
  #piece-palette>button{min-height:66px;padding:5px}
  #piece-palette>button img,#piece-palette>button svg{width:42px;height:42px}
  .builder-section .section-heading{margin-bottom:10px}
  .pivot-builder{grid-template-columns:96px minmax(0,1fr);gap:13px}
  #pivot-preview{width:96px;height:96px}
  .builder-stage{margin-bottom:7px}
  .rotation-fields{margin-top:10px}
  .program-actions{display:flex;gap:4px;margin-top:10px}
  .program-actions #confirm-program,.program-actions #edit-program{flex:1;padding-left:10px;padding-right:10px}
  .program-actions .quiet-button{padding-left:5px;padding-right:5px;font-size:12px}
  .mode-switch{margin-bottom:13px}
  .distance-field{margin-top:12px}
  .builder-actions{margin-top:14px}
  .page-footer{padding-top:12px;padding-bottom:12px}
}
@media(max-width:640px){
  body{padding-bottom:78px}
  body::after{content:"";position:fixed;left:0;right:0;bottom:0;height:72px;background:var(--paper);border-top:1px solid var(--line);z-index:20;pointer-events:none}
  #run,#confirm-program,#edit-program{position:fixed;bottom:14px;width:calc((100% - 36px)/2);min-height:44px;z-index:21;margin:0;font-size:14px;padding:10px 12px}
  #run{left:12px}
  #confirm-program,#edit-program{right:12px}
  .program-actions:has(#confirm-program:not([hidden])) #edit-program{position:static;width:auto;min-height:44px;grid-column:1/-1;z-index:auto;margin:0;left:auto;right:auto;bottom:auto}
  .playback-main{grid-template-columns:repeat(3,minmax(0,1fr))}
  .command-panel>.piece-section,.command-panel>.builder-section,.command-panel>.program-section{padding:17px 18px}
  #piece-palette>button{min-height:74px}
  #piece-palette>button img,#piece-palette>button svg{width:46px;height:46px}
  .program-actions{margin-top:10px}
  #toast{bottom:86px}
}
/* The combined action keeps each part readable and the long sidebar scrollable. */
#combo-order{display:block;width:100%;min-height:44px;font-size:13px;margin-top:7px}
#combo-options,.combo-options,.combo-order{font-size:12px;line-height:1.6;color:var(--muted);margin:14px 0}
#move-options:not([hidden])~#rotate-options:not([hidden]){margin-top:17px;padding-top:15px;border-top:1px solid var(--line)}
@media(min-width:961px){
  .command-panel{overflow-y:auto;overflow-x:hidden;overscroll-behavior:contain;scrollbar-gutter:stable;scroll-padding:16px}
  .command-panel>.program-section{flex:0 0 auto;overflow:visible}
  #program-list{max-height:250px;flex:none}
}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{scroll-behavior:auto!important;transition:none!important;animation-duration:.01ms!important;animation-iteration-count:1!important}}