:root{--blue:#2765dd;--ink:#26364a;--muted:#65758a;--line:#dfe5ee;--paper:#fbfaf5;--green:#2765dd;--green-dark:#1f51b4}*{box-sizing:border-box}body{margin:0;background:#edf1f7;color:var(--ink);font:14px/1.5 -apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif}button,input,select{font:inherit;color:inherit}button,a{touch-action:manipulation}button{cursor:pointer;border:0;background:none;border-radius:9px;padding:10px 13px;transition:background .15s}button:hover:not(:disabled){background:#e8edf6}button:disabled{opacity:.36;cursor:not-allowed}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid #71a7fa;outline-offset:3px}input[type=checkbox],input[type=range]{accent-color:var(--blue)}input[type=checkbox]{width:18px;height:18px}input,select{border:1px solid var(--line);border-radius:7px;padding:8px;background:#fff}a{color:inherit;text-decoration:none}.app{height:100dvh;min-height:640px;max-width:2200px;margin:auto;padding:0 24px;display:flex;flex-direction:column}.header{min-height:82px;display:flex;justify-content:space-between;align-items:center;gap:16px}.brand{display:flex;align-items:center;gap:13px}.brand-icon{background:#2765dd;color:white;border-radius:14px;font-size:34px;line-height:1;width:48px;height:48px;display:grid;place-items:center}.brand h1{font-size:22px;margin:0;font-weight:700}.brand p{font-size:12px;color:var(--muted);margin:3px 0 0}.edition{font-size:11px;font-weight:400;color:var(--muted);margin-left:8px}.header-actions{display:flex;gap:7px;align-items:center}.quiet{color:var(--muted);font-size:12px;white-space:nowrap}.outline{border:1px solid #b6c8e7;background:#fff;font-size:12px}.icon-btn{font-size:22px;width:38px;height:38px;padding:3px}.save-status{font-size:11px;color:#557b69}.save-status:before{content:'●';font-size:7px;margin-right:5px}.boards-bar{height:45px;flex-shrink:0;display:flex;align-items:center;gap:6px;margin-bottom:12px;border-bottom:1px solid #d4dce9;min-width:0}.board-tabs{display:flex;overflow-x:auto;min-width:0;gap:5px;align-self:stretch;scrollbar-width:thin}.board-tab{white-space:nowrap;font-size:12px;padding:7px 15px;border-radius:8px 8px 0 0;border-bottom:3px solid transparent;color:#697990}.board-tab.active{color:var(--blue);background:#fff;border-bottom-color:var(--blue);font-weight:650}.tab-num{margin-right:9px;opacity:.6}.add-board{font-size:12px;white-space:nowrap}.board-actions{display:flex;margin-left:auto;align-items:center}.workspace{display:flex;flex:1;min-height:0;flex-direction:column}.canvas-panel{position:relative;min-height:0;display:flex;flex-direction:column;flex:1;border:1px solid var(--line);background:white;border-radius:15px;box-shadow:0 4px 20px #243c6306;overflow:hidden}.canvas-top{min-height:54px;display:flex;justify-content:space-between;align-items:center;gap:8px;padding:8px 16px;border-bottom:1px solid var(--line)}.preset-list{display:flex;align-items:center;gap:4px;flex-wrap:wrap}.preset-caption{font-size:11px;color:#8290a0;margin-right:9px}.preset{font-size:12px;padding:7px 11px;color:#55667d;display:flex;align-items:center;gap:6px}.preset span{font-size:21px;line-height:1}.preset.active{background:#e8efff;color:var(--blue);font-weight:650}.stage{flex:1;min-height:0;position:relative;display:flex;background:var(--paper);overflow:hidden;isolation:isolate}.stage>svg{display:block;position:absolute;inset:0;width:100%;height:100%;touch-action:none;user-select:none}.stage-label{position:absolute;top:18px;left:22px;z-index:2;color:#7c8b91;font-size:11px;display:flex;align-items:center;gap:8px;pointer-events:none}.live-dot{height:6px;width:6px;background:#71968d;border-radius:50%}.tool-rail{position:absolute;top:50%;left:15px;transform:translateY(-50%);background:#ffffffed;border:1px solid var(--line);box-shadow:0 4px 18px #263b4b0d;border-radius:13px;padding:5px;z-index:4}.tool{width:48px;height:43px;display:flex;flex-direction:column;justify-content:center;align-items:center;gap:0;padding:3px;color:#65758b}.tool>span{font-size:21px;line-height:24px}.tool small{font-size:10px;line-height:14px}.tool.active{background:#e7efff;color:var(--blue)}.rail-divider{height:1px;background:var(--line);margin:4px}.legend{position:absolute;bottom:16px;left:22px;display:flex;gap:15px;font-size:11px;color:#728186;pointer-events:none}.legend span{display:flex;align-items:center;gap:6px}.legend i{width:13px;height:8px;border:1.5px solid;display:block}.legend-original{border-color:#d88673!important;border-style:dashed!important;background:#f8e7e1}.legend-current{border-color:#267b61!important;background:#d9ece0}.legend-center{border-radius:50%;width:8px!important;height:8px!important;background:#cb8c3b;border-color:#cb8c3b!important}.scale-label{position:absolute;bottom:16px;right:20px;font-size:11px;color:#8c978e;pointer-events:none}.rotation-dock{display:flex;justify-content:center;align-items:center;gap:10px;flex-shrink:0;padding:12px 14px;margin:12px auto 0;background:#fff;border:1px solid var(--line);border-radius:13px;box-shadow:0 5px 15px #2c4a7108}.center-button{color:#28816a;background:#e8f3ec;font-size:13px}.segmented{display:flex;padding:3px;background:#f0f3f8;border-radius:9px}.segmented button{font-size:13px;padding:8px 11px}.segmented .selected{background:#ecab35;color:#3e2b07;box-shadow:0 1px 3px #9c70242b}.angle-value{display:flex;align-items:center;gap:5px;font-size:13px}.angle-value>span{color:#7a8798;font-size:11px}.angle-value input{width:60px;padding:7px;text-align:center;border-color:transparent;background:#f5f7fa;font-size:18px;font-weight:650}.speed-label select{font-size:12px;border:0;padding:7px 0}.primary{background:var(--blue);color:white}.primary:hover:not(:disabled){background:#2056bd}.rotate-button{background:#dc5c62;display:flex;align-items:center;gap:8px;font-weight:600;font-size:13px}.rotate-button:hover:not(:disabled){background:#c74950}.rotate-button #playAngle{display:none}.loop-button{background:#2765dd;color:white;font-size:13px;font-weight:600}.loop-button:hover:not(:disabled){background:#2056bd}.loop-button[aria-pressed=true]{background:#214a95}.canvas-bottom{display:flex;justify-content:space-between;align-items:center;gap:16px;font-size:11px;color:#6b7c90;padding:10px 6px;min-height:37px}.hint{display:flex;gap:7px;align-items:center}.footer{font-size:11px;display:flex;justify-content:space-between;color:#8691a1;padding:0 6px 12px}.footer b{font-weight:500;color:#4f6381;margin-left:8px}.settings-panel{position:absolute;right:15px;top:64px;bottom:12px;width:270px;overflow:auto;background:#fff;border:1px solid var(--line);box-shadow:0 8px 25px #23365320;border-radius:12px;padding:18px;z-index:8}.section-title{display:flex;justify-content:space-between;align-items:center}.section-title h2{font-size:17px;margin:0}.control-section{border-bottom:1px solid var(--line);padding-bottom:16px;margin-bottom:16px}h3{font-size:13px;margin:13px 0 10px}.coordinate-row{display:flex;gap:7px}.coordinate-row label{display:flex;gap:5px;align-items:center;color:#7a8795;min-width:0}.coordinate-row input{width:58px;min-width:0}.vertex-select{display:flex;align-items:center;justify-content:space-between;font-size:12px;margin-top:12px}.vertex-select select{max-width:135px;font-size:12px}.angle-presets{display:flex;gap:4px}.angle-presets button{border:1px solid var(--line);padding:5px;flex:1;font-size:12px}.angle-presets .active{color:var(--blue);background:#eff4ff;border-color:#acc4f0}#angleRange{width:100%;padding:0}.toggle-row{display:flex;align-items:center;gap:8px;font-size:13px;margin:12px 0}.settings-note{font-size:11px;line-height:1.7;color:#7f8e9e}.drawing-bar,.pen-options{position:absolute;bottom:44px;left:50%;transform:translateX(-50%);display:flex;align-items:center;gap:10px;z-index:5;background:#fff;padding:8px 12px;border-radius:10px;box-shadow:0 5px 20px #20344420;border:1px solid var(--line);font-size:12px;max-width:90%}.pen-options label{display:flex;align-items:center;gap:6px}.pen-options input{width:65px;padding:0}.swatch{width:24px;height:24px;border-radius:50%;background:var(--swatch);border:3px solid white;outline:1px solid transparent;padding:0}.swatch.active{outline-color:var(--swatch)}.swatch:hover:not(:disabled){background:var(--swatch)}.hidden{display:none!important}.stage[data-tool=pen] svg,.stage[data-tool=polygon] svg,.stage[data-tool=center] svg{cursor:crosshair}#shapeLayer>*{cursor:grab}#pointLayer circle,#centerLayer circle{cursor:grab}.stage[data-tool]:not([data-tool=select]) #shapeLayer>*{cursor:inherit}.toast{position:fixed;bottom:100px;left:50%;transform:translate(-50%,15px);background:#253d5bf5;color:white;padding:12px 20px;border-radius:10px;z-index:50;opacity:0;pointer-events:none;transition:.2s;max-width:90vw;font-size:13px}.toast.visible{opacity:1;transform:translate(-50%,0)}dialog{border:1px solid var(--line);border-radius:16px;padding:26px;max-width:700px;width:calc(100% - 32px);color:var(--ink);box-shadow:0 15px 80px #2343}dialog::backdrop{background:#20334866;backdrop-filter:blur(3px)}.dialog-head{display:flex;justify-content:space-between;align-items:center;gap:14px}.dialog-head h2{font-size:20px;margin:10px 0}.eyebrow{font-size:10px;letter-spacing:2px;color:#8493a4}.help-grid{display:grid;grid-template-columns:1fr 1fr;gap:22px;margin-top:20px}.help-grid article>span{color:#8c9db3}.help-grid p,.help-foot,dialog p{font-size:13px;line-height:1.9;color:#6b7b8e}.help-foot{border-top:1px solid var(--line);padding-top:16px}.dialog-actions{display:flex;justify-content:flex-end;gap:8px;margin-top:20px}#nameDialog,#confirmDialog{max-width:420px}#boardName{width:100%;margin-top:15px}.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0)}
@media(min-height:850px) and (min-width:801px){.tool{height:49px}.rotation-dock{margin-top:16px}.header{min-height:90px}}
@media(max-width:1100px){.app{padding:0 14px}.edition,.save-status,.preset-caption{display:none}.header-actions{gap:1px}.rotation-dock{gap:6px;padding:9px}.rotation-dock button{padding:9px}.angle-value>span{display:none}.header .quiet{padding:9px}.preset{padding:7px 8px}}
@media(max-width:800px){.app{height:auto;min-height:100dvh;padding:0 10px}.header{flex-wrap:wrap;padding:14px 0;gap:10px}.header-actions{width:100%;justify-content:flex-end}.header-actions .home-link{margin-right:auto}.brand h1{font-size:21px}.brand p{font-size:12px}.board-actions{display:none}.canvas-panel{height:520px;min-height:520px;flex:none}.canvas-top{padding:8px;align-items:flex-start}.canvas-top>.quiet{font-size:11px;padding:8px 4px}.preset{font-size:11px;padding:6px}.preset span{font-size:18px}.rotation-dock{width:100%;flex-wrap:wrap;justify-content:center;gap:7px}.rotation-dock button{min-height:42px}.loop-button,.rotate-button{flex:1;justify-content:center}.rotation-dock .center-button{font-size:12px}.angle-value input{width:55px}.legend{font-size:10px;gap:8px;left:12px}.scale-label{display:none}.tool-rail{left:9px}.tool{height:41px;width:43px}.settings-panel{right:8px;top:67px;bottom:8px;width:min(270px,calc(100% - 75px))}.canvas-bottom{align-items:flex-start;font-size:11px}.hint{max-width:55%}.footer{padding-top:5px;font-size:10px;gap:12px}.footer>span:last-child{display:none}.help-grid{grid-template-columns:1fr}.pen-options{flex-wrap:wrap;justify-content:center;bottom:45px}.stage-label{left:13px;top:13px}}
@media(prefers-reduced-motion:reduce){*{transition:none!important}}
.stage-label,.legend{left:94px}
@media(min-width:801px) and (max-height:780px){.tool{height:35px}.tool>span{font-size:18px;line-height:20px}.tool small{font-size:9px;line-height:12px}.tool-rail{top:50%;}.stage-label{top:15px}.legend{bottom:14px}}
@media(max-width:800px){.stage-label,.legend{left:73px}.legend{gap:7px;font-size:9px}}
@media(max-width:600px){.rotation-dock .loop-button{min-width:155px;white-space:nowrap}.rotation-dock .rotate-button{min-width:110px}.rotation-dock .speed-label{min-width:44px}.rotation-dock .quiet{padding:8px}}

/* Figure colors stay separate from pen colors; both legends follow the selected figure. */
.shape-color-bar{display:flex;align-items:center;gap:12px;padding:7px 16px;border-bottom:1px solid var(--line);background:#fff;flex-shrink:0;min-height:46px}
.shape-color-label,.shape-color-name{font-size:11px;color:#65758a;white-space:nowrap}.shape-color-name{color:#4f6075;min-width:24px}
.shape-palette{display:flex;gap:6px;align-items:center}.shape-swatch{padding:0;width:29px;height:29px;border-radius:50%;background:var(--swatch);border:3px solid white;box-shadow:0 0 0 1px #dce3eb;color:transparent;line-height:23px;font-size:15px;font-weight:700;flex-shrink:0}
.shape-swatch:hover:not(:disabled){background:var(--swatch);box-shadow:0 0 0 2px #8b9bb2}.shape-swatch.active{color:#fff;box-shadow:0 0 0 2px var(--swatch)}
.legend-current{border-color:var(--shape-color,#267b61)!important;background:var(--shape-fill,#267b6126)}.legend-original{border-color:var(--shape-color,#267b61)!important;background:var(--shape-fill,#267b6126);opacity:.5}
@media(max-width:650px){.shape-color-bar{gap:8px;padding:8px 10px}.shape-palette{gap:5px}.shape-color-name{display:none}.shape-swatch{width:29px;height:29px}.settings-panel{top:116px}}