:root{--ink:#10243e;--muted:#6a7c90;--line:#dbe3ec;--surface:#fff;--soft:#f4f7fa;--blue:#1769e0;--teal:#14a3a0;--orange:#ee9251;--shadow:0 10px 30px rgba(28,55,89,.08)}*{box-sizing:border-box}body{margin:0;background:#eef3f7;color:var(--ink);font:14px/1.45 Inter,"Microsoft YaHei",sans-serif}button,input{font:inherit}.topbar{height:64px;padding:0 22px;background:#fff;border-bottom:1px solid var(--line);display:flex;align-items:center;gap:26px}.brand{display:flex;align-items:center;gap:9px;color:var(--ink);font-weight:800;text-decoration:none}.brand-mark{width:30px;height:30px;display:grid;place-items:center;border-radius:8px;background:var(--ink);color:#fff;font-weight:900}.title{display:flex;gap:12px;align-items:baseline}.title span,.muted,.assistant-head span{color:var(--muted);font-size:12px}.toolbar{margin-left:auto;display:flex;gap:8px}.toolbar button,.view-toggle button,.quick-prompts button,.icon-button{border:1px solid var(--line);background:#fff;color:var(--ink);border-radius:6px;padding:7px 11px;cursor:pointer}.toolbar button:hover,.view-toggle button:hover,.quick-prompts button:hover{border-color:#9cb7db}.toolbar .primary{background:var(--blue);color:#fff;border-color:var(--blue)}.workspace{height:calc(100vh - 64px);min-height:650px;display:grid;grid-template-columns:260px minmax(440px,1fr) 320px;gap:12px;padding:12px}.sidebar,.stage-panel{background:var(--surface);border:1px solid var(--line);box-shadow:var(--shadow)}.sidebar{padding:18px;overflow:auto}.left-panel{border-radius:8px 0 0 8px}.right-panel{border-radius:0 8px 8px 0}.panel-heading,.stage-head,.assistant-head{display:flex;align-items:center;justify-content:space-between;gap:12px}.eyebrow{display:block;color:#8291a2;font-size:10px;font-weight:800;letter-spacing:.12em}.panel-heading h1,.stage-head h2,.assistant-head h2{font-size:17px;margin:3px 0 0}.muted{margin:12px 0 18px}.library{display:grid;grid-template-columns:1fr 1fr;gap:8px}.library button{min-height:62px;border:1px solid var(--line);background:var(--soft);border-radius:6px;text-align:left;padding:9px;cursor:pointer;color:var(--ink)}.library button:hover{border-color:var(--blue);background:#f0f6ff}.library b{display:block;font-size:13px}.library small{color:var(--muted);font-size:11px}.section-title{margin:20px 0 9px;color:#596c82;font-weight:800;font-size:12px;display:flex;justify-content:space-between}.object-list{display:grid;gap:5px}.object-item{display:flex;align-items:center;gap:9px;width:100%;padding:9px;border:1px solid transparent;background:#fff;text-align:left;border-radius:5px;color:var(--ink);cursor:pointer}.object-item:hover{background:var(--soft)}.object-item.active{background:#eaf2ff;border-color:#9ec2f2}.object-icon{width:24px;height:24px;border-radius:5px;background:#dce9fb;display:grid;place-items:center;color:var(--blue);font-size:11px;font-weight:800}.stage-panel{display:flex;flex-direction:column;min-width:0;border-radius:8px;overflow:hidden}.stage-head{padding:18px 20px;border-bottom:1px solid var(--line)}.view-toggle{display:flex}.view-toggle button{border-radius:0;padding:6px 13px}.view-toggle button:first-child{border-radius:5px 0 0 5px}.view-toggle button:last-child{border-radius:0 5px 5px 0;margin-left:-1px}.view-toggle button.active{background:var(--ink);color:#fff;border-color:var(--ink)}.stage{position:relative;flex:1;min-height:0;overflow:hidden;background:#dce6ef}.stage.grid{background-color:#e5edf4;background-image:linear-gradient(#cbd8e4 1px,transparent 1px),linear-gradient(90deg,#cbd8e4 1px,transparent 1px);background-size:32px 32px}.scene-svg{width:100%;height:100%;display:block}.iso-scene{position:absolute;inset:0;perspective:900px;overflow:hidden;background:linear-gradient(155deg,#dce8ef,#f4f7fa)}.iso-ground{position:absolute;width:620px;height:420px;left:50%;top:52%;transform:translate(-50%,-50%) rotateX(60deg) rotateZ(-34deg);background:#d7e2e9;border:1px solid #9cb3c4;box-shadow:0 24px 25px #8ea3b533}.iso-object{position:absolute;transform-style:preserve-3d;cursor:pointer;transition:filter .15s}.iso-object:hover{filter:brightness(1.08)}.iso-building{width:120px;height:90px;background:#87b6d7;border:2px solid #477ea8;box-shadow:18px 18px 0 #578eaf,34px 34px 0 #467a9a;transform:translate(-50%,-50%) rotateX(60deg) rotateZ(-34deg);}.iso-crane{width:150px;height:8px;background:#e89b52;border:1px solid #aa6831;transform:translate(-50%,-50%) rotateX(60deg) rotateZ(-34deg)}.iso-crane:after{content:"";position:absolute;width:8px;height:90px;left:40px;top:-88px;background:#d87f33}.iso-road{width:220px;height:36px;background:#7b8993;border:2px solid #53636e;transform:translate(-50%,-50%) rotateX(60deg) rotateZ(-34deg)}.iso-label{position:absolute;white-space:nowrap;transform:translate(-50%,-50%);font-size:11px;font-weight:800;color:#24425f;background:#ffffffcc;padding:2px 5px;border-radius:3px}.iso-selected{outline:3px solid var(--blue);outline-offset:5px}.statusbar{display:flex;justify-content:space-between;gap:10px;padding:9px 16px;color:#718297;font-size:11px;border-top:1px solid var(--line)}.status-dot{display:inline-block;width:7px;height:7px;border-radius:50%;background:#18a67d;margin-right:5px}.assistant-avatar{width:34px;height:34px;border-radius:8px;background:var(--ink);color:#fff;display:grid;place-items:center;font-size:11px;font-weight:900}.assistant-head{justify-content:flex-start}.assistant-note{margin:15px 0;padding:10px;border-left:3px solid var(--teal);background:#f0f8f7;color:#496775;font-size:12px}.quick-prompts{display:flex;flex-wrap:wrap;gap:5px}.quick-prompts button{padding:5px 8px;font-size:11px;background:#f7f9fb}.chat{height:190px;overflow:auto;margin-top:12px;padding:4px 0}.message{padding:9px 10px;margin:7px 0;border-radius:6px;font-size:12px;white-space:pre-wrap}.message.ai{background:#f1f4f7}.message.user{background:#e9f2ff;margin-left:24px}.chat-form{display:flex;border:1px solid var(--line);border-radius:6px;overflow:hidden}.chat-form input{flex:1;border:0;padding:9px;outline:0;min-width:0}.chat-form button{width:36px;border:0;background:var(--blue);color:#fff;cursor:pointer}.properties{border-top:1px solid var(--line);margin-top:16px;padding-top:4px}.property-grid{display:grid;gap:8px}.property-grid label{display:grid;gap:3px;color:#6a7c90;font-size:11px}.property-grid input{width:100%;border:1px solid var(--line);border-radius:4px;padding:6px 7px;color:var(--ink)}.empty-state{color:#94a3b3;font-size:12px;padding:10px 0}.danger{color:#b54c4c;background:#fff;border:1px solid #e4baba;border-radius:4px;padding:6px 9px;cursor:pointer}@media(max-width:1080px){.workspace{grid-template-columns:220px minmax(340px,1fr)}.right-panel{grid-column:1/-1;height:270px;display:grid;grid-template-columns:1fr 1fr;gap:10px}.right-panel .chat{height:110px;margin-top:0}.properties{margin-top:0}}@media(max-width:760px){.topbar{padding:0 12px;gap:12px}.title span,.brand>span:last-child{display:none}.toolbar button{padding:6px 8px}.toolbar button:not(.primary){font-size:0}.toolbar button:not(.primary)::first-letter{font-size:14px}.workspace{display:flex;flex-direction:column;height:auto;min-height:calc(100vh - 64px)}.left-panel{order:2}.stage-panel{order:1;height:62vh;min-height:430px}.right-panel{order:3;height:auto;display:block}.stage{min-height:320px}}