:root{color-scheme:light;--paper:#f7f6f2;--panel:#fffefa;--ink:#282922;--muted:#65665e;--line:#d8d8d0;--accent:#ad3f16;--soft:#f6e8df;--focus:#b44418;font:14px/1.45 "Segoe UI",system-ui,sans-serif}
:root[data-theme=dark]{color-scheme:dark;--paper:#222520;--panel:#2a2e28;--ink:#f2f2e9;--muted:#bbbfb3;--line:#4b5146;--accent:#ef9b6b;--soft:#4b362b;--focus:#ffb28c}
*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);height:100dvh;display:grid;grid-template-rows:62px minmax(0,1fr) 62px;overflow:hidden}button,a{touch-action:manipulation}button{font:inherit;color:inherit;background:var(--panel);border:1px solid var(--line);border-radius:6px;padding:8px 13px;cursor:pointer;min-height:36px}button:hover:not(:disabled){background:var(--soft);border-color:var(--accent)}button:disabled{opacity:.5;cursor:not-allowed}:focus-visible{outline:2px solid var(--focus);outline-offset:3px}a{color:inherit;text-underline-offset:3px}::selection{background:#f0bb96;color:#282922}.topbar{display:flex;align-items:center;gap:9px;padding:0 20px;border-bottom:1px solid var(--line)}.brand{display:flex;align-items:center;gap:8px;text-decoration:none;white-space:nowrap}.brand strong{font-size:17px;letter-spacing:-.02em}.brand span{font-weight:400;color:var(--muted)}.test-label{font-size:10px;padding:3px 6px;border:1px solid var(--line);border-radius:3px;white-space:nowrap}.file-title{flex:1;min-width:40px;text-align:center;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;color:var(--muted);padding:0 15px}.workspace{display:grid;grid-template-columns:84px minmax(0,1fr);min-height:0}.tasknav{border-right:1px solid var(--line);display:flex;flex-direction:column;align-items:stretch;padding:18px 8px;gap:12px}.tasknav button{background:none;border-color:transparent;display:grid;justify-items:center;gap:5px;font-size:12px;padding:10px 2px}.tasknav button[aria-current=page]{background:var(--soft);color:var(--accent);border-color:var(--accent)}svg{width:23px;height:23px;fill:none;stroke:currentColor;stroke-width:1.5;stroke-linecap:round;stroke-linejoin:round}.nav-foot{margin-top:auto;text-align:center;color:var(--muted);font-size:10px}#engines{position:relative;min-width:0;min-height:0}iframe{border:0;width:100%;height:100%;display:block;background:var(--panel)}[hidden]{display:none!important}.boot{padding:40px;color:var(--muted)}.actionbar{display:flex;align-items:center;gap:20px;padding:10px 20px;border-top:1px solid var(--line);background:var(--panel)}.mode-switch{display:flex;flex:none}.mode-switch button{border-radius:0}.mode-switch button:first-child{border-radius:5px 0 0 5px}.mode-switch button:last-child{border-radius:0 5px 5px 0;margin-left:-1px}.mode-switch button[aria-pressed=true]{background:var(--soft);color:var(--accent);border-color:var(--accent);z-index:1}#workspace-status{flex:1;font-size:12px;line-height:1.35;margin:0;max-height:34px;overflow:hidden}.primary{background:var(--accent);color:var(--panel);border-color:var(--accent);font-weight:600;min-width:190px}.primary:hover:not(:disabled){background:var(--accent);filter:brightness(1.12)}dialog{max-width:min(620px,calc(100vw - 30px));max-height:85dvh;overflow:auto;padding:30px;background:var(--panel);color:var(--ink);border:1px solid var(--line);border-radius:12px;box-shadow:0 20px 70px #0004}dialog::backdrop{background:#151911aa}dialog h1{font-size:23px;line-height:1.2;margin:20px 0}dialog li{margin:12px 0}.close{float:right}
@media(max-width:900px){.test-label,.file-title{display:none}.topbar{padding:0 12px}.brand{margin-right:auto}.brand span{display:none}.workspace{grid-template-columns:68px minmax(0,1fr)}.tasknav{padding:12px 5px}.actionbar{gap:10px;padding:8px 12px}#workspace-status{display:none}.primary{margin-left:auto;min-width:0}}
@media(max-width:560px){body{grid-template-rows:54px minmax(0,1fr) 58px}.topbar{gap:5px;padding:0 8px}.topbar button{font-size:12px;padding:6px 8px}.brand strong{font-size:15px}.brand img{width:25px;height:25px}#theme{display:none}.workspace{display:flex;flex-direction:column}.tasknav{order:1;flex:none;border:0;border-top:1px solid var(--line);flex-direction:row;padding:3px 6px;gap:2px;justify-content:space-around}.tasknav button{display:flex;align-items:center;font-size:12px;padding:5px 8px;gap:5px}.tasknav svg{width:18px;height:18px}.nav-foot{display:none}#engines{flex:1}.actionbar{gap:6px;padding:7px 8px}.actionbar button{font-size:12px;padding:7px 9px}.mode-switch{max-width:52%}.primary{white-space:normal}}
@font-face{font-family:Plex;src:url('fonts/plex-sans.woff2') format('woff2');font-style:normal;font-weight:100 700;font-display:swap}
.brand strong,dialog h1{font-family:Plex,"Segoe UI",sans-serif}
/* Critical shell feedback stays visible on narrow screens, above both actions. */
@media(max-width:900px){body{grid-template-rows:62px minmax(0,1fr) auto}.actionbar{display:grid;grid-template-columns:auto minmax(0,1fr);gap:6px 10px;min-height:84px}#workspace-status{display:block;grid-column:1/-1;grid-row:1;font-size:11px;max-height:none;overflow:visible}.mode-switch{grid-column:1;grid-row:2;max-width:none}.actionbar>.primary{grid-column:2;grid-row:2;justify-self:end}.mode-switch button{white-space:nowrap}}
@media(max-width:560px){body{grid-template-rows:54px minmax(0,1fr) auto}.actionbar{min-height:78px}}
[data-model-handoff]{position:fixed;top:64px;left:100px;max-width:min(600px,calc(100vw - 120px));padding:10px 14px;background:var(--panel);color:var(--ink);border:1px solid var(--line);border-radius:6px;z-index:10;font-size:12px}
/* Keep a loading frame in layout so browser scheduling cannot defer its startup. */
iframe[data-mounting]{position:absolute;inset:0;visibility:hidden;pointer-events:none}
.actionbar>.mode-switch{display:none}.project-menu{position:relative;flex:none}.project-menu summary{cursor:pointer;border:1px solid var(--line);border-radius:6px;padding:8px 12px}.project-menu>div{position:absolute;right:0;top:44px;z-index:20;min-width:180px;display:flex;flex-direction:column;gap:6px;padding:10px;background:var(--panel);border:1px solid var(--line);border-radius:8px;box-shadow:0 6px 20px #0002}.project-menu button{display:block!important;text-align:left}.actionbar>.primary{margin-left:auto}