:root{--bg:#0c0e12;--panel:#12151b;--panel2:#171a22;--line:#282d38;--muted:#7f8797;--text:#edf0f6;--accent:#d9ff4f;--accent2:#b7dc34;--danger:#ff5f68;--blue:#59a6ff;--control-bg:#181b22;--input-bg:#0d1015;--work-bg:#090b0f;--toolbar-bg:#11141a;--card-bg:#171a21;--card-hover:#1b1f24}*{box-sizing:border-box}html,body{margin:0;height:100%;overflow:hidden;background:var(--bg);color:var(--text);font:13px Inter,"Segoe UI",Arial,sans-serif}button,input,select{font:inherit}.topbar{height:64px;display:flex;align-items:center;border-bottom:1px solid var(--line);background:#0f1116;padding:0 18px;position:relative;z-index:5}.brand{width:286px;display:flex;align-items:center;gap:11px}.brand-mark{width:34px;height:34px;display:grid;place-items:center;background:var(--accent);color:#0a0c0c;border-radius:8px;font-size:12px;font-weight:900;box-shadow:0 0 22px #d9ff4f25}.brand strong{display:block;font-size:15px;letter-spacing:.2px}.brand small{display:block;font-size:8px;letter-spacing:2px;color:var(--muted);margin-top:2px}.project-title{position:absolute;left:50%;transform:translateX(-50%);display:flex;align-items:center;background:#151820;border:1px solid #242934;border-radius:8px;padding:0 12px}.project-title input{width:210px;height:34px;border:0;outline:0;background:transparent;color:#cbd0dc;text-align:center}.status-dot{width:6px;height:6px;background:var(--accent);border-radius:50%}.top-actions{margin-left:auto;display:flex;gap:8px}.btn,.icon-btn,.mini-btn{border:1px solid var(--line);background:#181b22;color:#cad0db;border-radius:7px;cursor:pointer;height:34px;padding:0 13px}.icon-btn{width:34px;padding:0;font-size:17px}.btn.primary{background:var(--accent);color:#11140b;border-color:var(--accent);font-weight:700}.btn:hover,.icon-btn:hover,.mini-btn:hover{border-color:#4a5261}.app-shell{height:calc(100vh - 64px);display:grid;grid-template-columns:286px minmax(500px,1fr) 292px}.panel{background:var(--panel);overflow:auto;scrollbar-width:thin;scrollbar-color:#303641 transparent}.left-panel{border-right:1px solid var(--line)}.right-panel{border-left:1px solid var(--line)}.left-panel section{padding:18px;border-bottom:1px solid var(--line)}.section-title{display:flex;align-items:center;justify-content:space-between;text-transform:uppercase;font-weight:700;font-size:11px;letter-spacing:1.1px}.section-hint{color:var(--muted);font-size:11px;margin:7px 0 14px}.mini-btn{height:24px;padding:0 7px;font-size:10px}.element-grid{display:grid;grid-template-columns:1fr 1fr;gap:8px}.element-card{height:100px;display:flex;flex-direction:column;align-items:flex-start;justify-content:center;padding:12px;background:#171a21;border:1px solid #292e39;border-radius:9px;color:var(--text);cursor:grab;transition:.18s}.element-card:hover{border-color:#8a9d45;background:#1b1f24;transform:translateY(-1px)}.element-card b{font-size:12px;margin-top:7px}.element-card small{font-size:9px;color:var(--muted);margin-top:3px}.element-icon{height:24px;color:var(--accent);font-weight:800;display:block}.stage-icon{width:36px;border:2px solid var(--accent);border-radius:3px;background:repeating-linear-gradient(135deg,#d9ff4f25 0 3px,transparent 3px 6px)}.seat-icon{line-height:8px;letter-spacing:4px;font-size:15px}.truss-icon{font-size:17px;letter-spacing:-3px}.ruler-icon{font-size:11px;padding-top:7px}.control-icon,.custom-icon{font-size:22px;line-height:24px}.layout-list{display:flex;flex-direction:column;gap:7px;margin-top:12px}.layout-option{position:relative;display:flex;align-items:center;gap:11px;width:100%;height:58px;text-align:left;background:#171a21;border:1px solid #282e38;border-radius:8px;color:var(--text);cursor:pointer;padding:8px}.layout-option.active{border-color:#95ad40;background:#1a1e1d}.layout-option span:nth-child(2){display:flex;flex-direction:column;gap:3px}.layout-option small{font-size:9px;color:var(--muted)}.layout-option i{display:none;margin-left:auto;color:var(--accent);font-style:normal}.layout-option.active i{display:block}.layout-preview{width:42px;height:38px;display:grid;place-items:center;border-radius:5px;background:#101218;color:#aebb69;font-size:10px}.grid-preview{background-image:radial-gradient(circle,#bcd56d 1.4px,transparent 1.8px);background-size:8px 8px}.classroom-preview{color:#bcd56d;line-height:13px;font-size:13px}.layers-section{min-height:160px}.layer-list{margin-top:10px;display:flex;flex-direction:column;gap:4px}.layer-item{display:flex;align-items:center;gap:8px;padding:8px;border-radius:5px;color:#9da5b4;cursor:pointer}.layer-item:hover,.layer-item.active{background:#1c2028;color:#fff}.layer-item.active{box-shadow:inset 2px 0 var(--accent)}.layer-swatch{width:9px;height:9px;border-radius:2px}.layer-lock{margin-left:auto;font-size:10px}.workspace{min-width:0;background:#090b0f;display:flex;flex-direction:column;position:relative}.workspace-toolbar{height:48px;flex:0 0 auto;background:#11141a;border-bottom:1px solid var(--line);display:flex;align-items:center;padding:0 14px;justify-content:space-between}.tool-group{display:flex;background:#090b0f;border:1px solid var(--line);border-radius:6px;padding:2px}.tool{width:31px;height:29px;border:0;background:transparent;color:#8790a0;border-radius:4px;cursor:pointer}.tool.active{background:#2a3038;color:var(--accent)}.view-info{font-size:10px;color:var(--muted);display:flex;gap:13px;align-items:center}.divider{height:13px;width:1px;background:var(--line)}.view-actions{display:flex;align-items:center;gap:13px}.switch-label,.switch-row{display:flex;align-items:center;gap:7px;color:#9aa2b1;font-size:10px;cursor:pointer}.switch-label input,.switch-row input{display:none}.switch{width:28px;height:15px;background:#2b3039;border-radius:10px;position:relative;transition:.2s}.switch:after{content:"";position:absolute;width:11px;height:11px;left:2px;top:2px;background:#777f8c;border-radius:50%;transition:.2s}.switch-label input:checked+.switch,.switch-row input:checked+.switch{background:#8ca52b}.switch-label input:checked+.switch:after,.switch-row input:checked+.switch:after{left:15px;background:#eaff9e}.toggle-btn{border:1px solid var(--line);background:#181b22;color:#8992a1;border-radius:5px;height:27px;font-size:10px;cursor:pointer}.toggle-btn.active{color:var(--accent);border-color:#65752f}.canvas-viewport{flex:1;min-height:0;overflow:hidden;position:relative;cursor:default;background:radial-gradient(circle at center,#181d26,#090b0f 70%)}#designCanvas{position:absolute;transform-origin:0 0;box-shadow:0 18px 60px #0003;background:#eef0f2}.canvas-viewport.drag-over .drop-tip{opacity:1;transform:translate(-50%,-50%) scale(1)}.drop-tip{position:absolute;left:50%;top:50%;padding:14px 22px;border:1px dashed var(--accent);background:#12170fe6;color:var(--accent);border-radius:8px;opacity:0;transform:translate(-50%,-50%) scale(.95);pointer-events:none;transition:.18s}.canvas-badge{position:absolute;left:16px;bottom:15px;background:#0a0d12cc;border:1px solid #292f3a;color:#727c8c;padding:5px 8px;font-size:9px;border-radius:4px}.zoom-bar{height:42px;background:#11141a;border-top:1px solid var(--line);display:flex;align-items:center;justify-content:center;gap:8px}.zoom-bar button{border:0;background:transparent;color:#9ca5b4;cursor:pointer}.zoom-bar input{width:130px;accent-color:var(--accent)}.zoom-bar span{font-size:10px;color:#858e9d;width:34px}.zoom-bar .fit-btn{border-left:1px solid var(--line);padding-left:12px;margin-left:3px;font-size:10px}.inspector-header{height:78px;border-bottom:1px solid var(--line);padding:17px 18px;display:flex;justify-content:space-between;align-items:center}.inspector-header small{font-size:9px;color:var(--muted);text-transform:uppercase;letter-spacing:1px}.inspector-header h2{font-size:14px;margin:6px 0 0}.type-badge{font-size:8px;border:1px solid #3a414d;color:#9099a8;border-radius:4px;padding:4px 6px;text-transform:uppercase}.empty-inspector{text-align:center;padding:90px 28px;color:#a0a8b6}.empty-inspector .empty-icon{margin:auto auto 16px;width:50px;height:50px;display:grid;place-items:center;border:1px solid #2f3540;border-radius:50%;font-size:21px;color:var(--accent)}.empty-inspector p{font-size:10px;line-height:1.7;color:#697282}.hidden{display:none!important}.property-form section{padding:16px 18px;border-bottom:1px solid var(--line)}.property-title{text-transform:uppercase;font-size:9px;font-weight:700;letter-spacing:1px;color:#c6ccd6;margin-bottom:13px}.property-title small{float:right;color:#656e7c;font-weight:400}.field-row{display:grid;grid-template-columns:1fr 1fr;gap:8px}.field{display:flex;flex-direction:column;gap:6px;color:#798291;font-size:9px;margin-bottom:10px}.field>span{display:flex;justify-content:space-between}.field input,.field select{width:100%;height:33px;background:#0d1015;border:1px solid #2a303a;color:#dde1e9;border-radius:5px;padding:0 9px;outline:0}.field input:focus,.field select:focus{border-color:#8da23d}.field input[type=range]{padding:0;accent-color:var(--accent);border:0;height:15px}.color-field{display:flex;gap:5px}.color-field input[type=color]{width:38px;padding:3px}.switch-row{justify-content:space-between;margin:12px 0;color:#aeb5c0;font-size:11px}.switch-row .switch{margin-left:auto}.capacity,.measure-card{background:#0d1015;border:1px solid #282e38;border-radius:7px;padding:12px;display:flex;justify-content:space-between;align-items:center;color:#828b99;font-size:10px}.ruler-fields{margin-top:12px}#designCanvas.white-canvas{background:#fff;box-shadow:0 18px 60px #0005}.capacity strong,.measure-card strong{color:var(--accent);font-size:13px}.delete-btn{display:block;margin:18px;width:calc(100% - 36px);height:36px;background:#24171a;border:1px solid #553039;color:#ff7b82;border-radius:6px;cursor:pointer}.delete-btn:hover{background:#351b20}.toast{position:fixed;left:50%;bottom:54px;transform:translate(-50%,20px);padding:10px 16px;background:#20251c;color:#dfff75;border:1px solid #66792a;border-radius:6px;opacity:0;pointer-events:none;transition:.25s;z-index:20}.toast.show{opacity:1;transform:translate(-50%,0)}@media(max-width:1100px){.app-shell{grid-template-columns:230px minmax(420px,1fr) 260px}.brand{width:230px}.element-grid{grid-template-columns:1fr}.element-card{height:74px}.project-title{display:none}}.property-form .field{font-size:12px;gap:7px}.property-form .property-title{font-size:11px}.property-form .field input,.property-form .field select{height:38px;font-size:15px}.property-form .field input[type=number]{font-variant-numeric:tabular-nums}.layer-actions{display:grid;grid-template-columns:1fr 1fr;gap:5px;margin-top:8px}.layer-actions .mini-btn{height:28px;padding:0 5px}.canvas-settings .field{margin-top:12px}.canvas-size-btn{width:100%;height:32px;font-size:11px;padding:0}.floor-icon{width:36px;border:2px solid var(--muted);transform:skew(-18deg);font-size:22px;line-height:18px;text-align:center}.property-form input[type=number]::-webkit-inner-spin-button,.property-form input[type=number]::-webkit-outer-spin-button,.canvas-settings input[type=number]::-webkit-inner-spin-button,.canvas-settings input[type=number]::-webkit-outer-spin-button{-webkit-appearance:none;margin:0}.property-form input[type=number],.canvas-settings input[type=number]{-moz-appearance:textfield;appearance:textfield}.property-form .field{position:relative}.property-form .field input[type=number]{padding-right:34px}.property-form .field input[type=number]::after{content:''}.slider-popover{position:fixed;z-index:50;width:58px;height:190px;padding:10px 17px;background:#1a1f27;border:1px solid #65752f;border-radius:7px;box-shadow:0 12px 30px #0009}.slider-popover input[type=range]{width:145px;height:20px;transform:rotate(-90deg) translate(-72px,-43px);transform-origin:top left;accent-color:var(--accent)}.slider-popover output{position:absolute;bottom:7px;left:0;width:100%;text-align:center;color:var(--accent);font-size:12px}.canvas-viewport.panning{cursor:grabbing!important}.canvas-viewport.panning #designCanvas{cursor:grabbing}

/* 主题、尺寸参数与控件可读性 */
:root[data-theme="light"]{--bg:#f1f3f6;--panel:#ffffff;--panel2:#f7f8fa;--line:#d7dce4;--muted:#657080;--text:#1b2430;--control-bg:#ffffff;--input-bg:#ffffff;--work-bg:#e8ebef;--toolbar-bg:#ffffff;--card-bg:#f7f8fa;--card-hover:#eef2f5}
[data-theme="light"] body{background:var(--bg);color:var(--text)}
[data-theme="light"] .topbar,[data-theme="light"] .workspace-toolbar,[data-theme="light"] .zoom-bar{background:var(--toolbar-bg);border-color:var(--line)}
[data-theme="light"] .project-title{background:#f7f8fa;border-color:var(--line)}
[data-theme="light"] .project-title input{color:var(--text)}
[data-theme="light"] .btn,[data-theme="light"] .icon-btn,[data-theme="light"] .mini-btn,[data-theme="light"] .toggle-btn{background:var(--control-bg);border-color:var(--line);color:var(--text)}
[data-theme="light"] .btn.primary{background:var(--accent);border-color:var(--accent);color:#11140b}
[data-theme="light"] .panel{background:var(--panel);scrollbar-color:#c4cbd5 transparent}
[data-theme="light"] .element-card,[data-theme="light"] .layout-option{background:var(--card-bg);border-color:var(--line);color:var(--text)}
[data-theme="light"] .element-card:hover,[data-theme="light"] .layout-option:hover{background:var(--card-hover)}
[data-theme="light"] .layout-option.active{background:#f1f7df;border-color:#8fa83b}
[data-theme="light"] .layout-preview{background:#edf1f5}
[data-theme="light"] .layer-item{color:#596575}
[data-theme="light"] .layer-item:hover,[data-theme="light"] .layer-item.active{background:#eef2f5;color:#17202b}
[data-theme="light"] .workspace{background:var(--work-bg)}
[data-theme="light"] .tool-group{background:#f7f8fa;border-color:var(--line)}
[data-theme="light"] .tool{color:#667383}
[data-theme="light"] .tool.active{background:#e4ebd1;color:#4f6615}
[data-theme="light"] .canvas-viewport{background:radial-gradient(circle at center,#f9fafb,#e1e5ea 70%)}
[data-theme="light"] .canvas-badge{background:#ffffffdd;border-color:#cbd2dc;color:#586575}
[data-theme="light"] .field input,[data-theme="light"] .field select,[data-theme="light"] .capacity,[data-theme="light"] .measure-card{background:var(--input-bg);border-color:var(--line);color:var(--text)}
[data-theme="light"] .field input{color:var(--text)}
[data-theme="light"] .property-title{color:#344150}
[data-theme="light"] .empty-inspector{color:#4d5968}
[data-theme="light"] .empty-inspector .empty-icon{border-color:#cbd2dc}
[data-theme="light"] .empty-inspector p{color:#697687}
[data-theme="light"] .type-badge{border-color:#c1c9d4;color:#5d6978}
[data-theme="light"] .delete-btn{background:#fff1f2;border-color:#efb7bd;color:#c32e3b}
[data-theme="light"] .delete-btn:hover{background:#ffe3e6}
[data-theme="light"] .toast{background:#f2f8df;color:#536b16;border-color:#a8c34b}
[data-theme="light"] .element-icon{color:#304a64!important}
[data-theme="light"] .stage-icon{border-color:#304a64;background:repeating-linear-gradient(135deg,#304a6422 0 3px,transparent 3px 6px)}
[data-theme="light"] .seat-icon,[data-theme="light"] .truss-icon,[data-theme="light"] .ruler-icon,[data-theme="light"] .control-icon,[data-theme="light"] .custom-icon,[data-theme="light"] .floor-icon{color:#304a64!important}
[data-theme="light"] .grid-preview{background-image:radial-gradient(circle,#304a64 1.4px,transparent 1.8px)}
[data-theme="light"] .classroom-preview,[data-theme="light"] .layout-preview{color:#304a64}
[data-theme="light"] .layout-option i{color:#304a64}
[data-theme="light"] .element-card b,[data-theme="light"] .layout-option b,[data-theme="light"] .field>span,[data-theme="light"] .property-title{color:#1f3347}
[data-theme="light"] .element-card small,[data-theme="light"] .layout-option small{color:#536678}
[data-theme="light"] .slider-popover{background:#ffffff;border-color:#8fa83b;box-shadow:0 12px 30px #26324133}
.canvas-settings .field>span{font-size:14px;color:var(--text);font-weight:700}
.canvas-settings .field input{height:44px;font-size:20px;font-weight:700;color:var(--text);background:var(--input-bg);border-color:var(--line)}
.theme-btn{min-width:82px}
.project-panel{position:absolute;right:18px;top:56px;width:330px;max-height:calc(100vh - 78px);display:flex;flex-direction:column;background:var(--panel2);border:1px solid var(--line);border-radius:10px;box-shadow:0 18px 55px #0008;z-index:30;overflow:hidden}.project-panel-header{display:flex;align-items:center;justify-content:space-between;padding:14px 15px;border-bottom:1px solid var(--line)}.project-panel-header strong{display:block;font-size:13px}.project-panel-header small{display:block;color:var(--muted);font-size:10px;margin-top:4px}.project-list{padding:8px;overflow:auto}.project-list-item{display:flex;align-items:stretch;gap:4px;border:1px solid transparent;border-radius:8px;margin-bottom:5px}.project-list-item.active{background:#252b22;border-color:#65752f}.project-switch{min-width:0;flex:1;text-align:left;border:0;background:transparent;color:var(--text);cursor:pointer;padding:10px 9px}.project-switch:hover{background:#ffffff08;border-radius:7px}.project-list-name{display:block;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-weight:700;font-size:12px}.project-switch small{display:block;color:var(--muted);font-size:9px;margin-top:5px}.project-delete{width:30px;border:0;background:transparent;color:#8e5961;cursor:pointer;font-size:18px}.project-delete:hover{color:var(--danger);background:#ff5f6812;border-radius:7px}.project-panel-footer{padding:10px 12px;border-top:1px solid var(--line)}.project-panel-footer .btn{width:100%;height:32px}
[data-theme="light"] .project-panel{background:#fff;box-shadow:0 18px 55px #26324133}.project-list-item.active{background:#f1f7df;border-color:#8fa83b}[data-theme="light"] .project-switch:hover{background:#eef2f5}[data-theme="light"] .project-delete{color:#b86b73}
@media(max-width:1100px){.project-panel{right:10px;width:300px}}