:root{
  --app-bg:#eef2f5;--panel:#fff;--ink:#17365d;--muted:#647381;
  --blue:#0089c8;--blue-dark:#07558c;--red:#d51b24;--line:#d8e1e7;
}
*{box-sizing:border-box}
html,body{margin:0;min-height:100%;font-family:Arial,Helvetica,sans-serif;color:#17242e;background:var(--app-bg)}
button,select,input{font:inherit}
.app-header{height:72px;background:#fff;border-bottom:1px solid var(--line);display:flex;align-items:center;gap:14px;padding:10px 22px}
.app-logo{width:54px;height:54px;object-fit:contain}
.app-header h1{margin:0;color:var(--ink);font-size:22px}
.app-header p{margin:3px 0 0;color:var(--muted);font-size:13px}
.app-shell{display:grid;grid-template-columns:300px 1fr;min-height:calc(100vh - 72px)}
.sidebar{padding:16px;display:flex;flex-direction:column;gap:12px;border-right:1px solid var(--line);background:#f7f9fb}
.panel{background:var(--panel);border:1px solid var(--line);border-radius:10px;padding:13px}
.panel h2{font-size:14px;margin:0 0 10px;color:var(--ink)}
.hint{font-size:11px;color:var(--muted);line-height:1.35;margin:-4px 0 9px}
.template-list,.module-list{display:grid;gap:6px}
.template-button{width:100%;text-align:left;border:1px solid var(--line);background:#fff;border-radius:7px;padding:9px;cursor:pointer}
.template-button.active{border-color:var(--blue);box-shadow:0 0 0 1px var(--blue) inset}
.template-button small{display:block;color:var(--muted);margin-top:2px}
.template-button[disabled]{opacity:.5;cursor:not-allowed}
.module-toggle{display:flex;align-items:center;gap:8px;font-size:12px;padding:4px 0}
.control-row{display:flex;justify-content:space-between;align-items:center;font-size:12px;margin-bottom:10px}
button{width:100%;border:0;border-radius:7px;padding:9px 10px;background:var(--blue-dark);color:#fff;font-weight:700;cursor:pointer;margin-top:7px}
button.secondary{background:#edf3f7;color:var(--ink);border:1px solid var(--line)}
.workspace{overflow:auto;padding:24px;min-width:0}
.workspace-note{font-size:12px;color:var(--muted);margin-bottom:16px}
.preview{display:flex;gap:24px;align-items:flex-start;transform-origin:top left}
@media(max-width:800px){
  .app-shell{grid-template-columns:1fr}.sidebar{border-right:0;border-bottom:1px solid var(--line)}
}