:root{--ink:#1f2328;--ink-2:#57606a;--ink-3:#8b949e;--surface:#ffffff;--panel:#f6f8fa;--line:#d0d7de;--pass:#1a7f37;--pass-bg:#dafbe1;--fail:#b42318;--fail-bg:#ffebe9;--warn:#9a6700;--warn-bg:#fff8c5;--accent:#0969da}*{box-sizing:border-box}body,html{margin:0;height:100%;color:var(--ink);background:var(--surface);font:15px/1.55 -apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif}.shell{display:flex;flex-direction:column;height:100vh}header.top{display:flex;align-items:center;gap:14px;padding:12px 20px;border-bottom:1px solid var(--line)}header.top h1{font-size:16px;margin:0}header.top .sub{color:var(--ink-2);font-size:13px}header.top .spacer{flex:1 1}.verdict{font-weight:650;font-size:13.5px;padding:4px 12px;border-radius:999px;white-space:nowrap}.verdict.pass{color:var(--pass);background:var(--pass-bg)}.verdict.fail{color:var(--fail);background:var(--fail-bg)}.stat{font-size:13.5px;color:var(--ink-2);white-space:nowrap}.stat b{color:var(--ink);font-feature-settings:"tnum";font-variant-numeric:tabular-nums}.main{display:grid;grid-template-columns:420px 1fr;flex:1 1;min-height:0}@media (max-width:900px){.main{grid-template-columns:1fr}.report-pane{display:none}}.chat-pane{display:flex;flex-direction:column;border-right:1px solid var(--line);min-height:0}.messages{flex:1 1;overflow-y:auto;padding:16px;display:flex;flex-direction:column;gap:10px}.msg{max-width:92%;padding:9px 13px;border-radius:10px;font-size:14px;white-space:pre-wrap}.msg.user{align-self:flex-end;background:var(--accent);color:#fff}.msg.system{align-self:flex-start;background:var(--panel);border:1px solid var(--line)}.msg.system .mono{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:12.5px}.msg .chip{display:inline-block;font-size:12px;font-weight:650;padding:1px 9px;border-radius:999px;margin-bottom:4px}.msg .chip.pass{color:var(--pass);background:var(--pass-bg)}.msg .chip.fail{color:var(--fail);background:var(--fail-bg)}.msg .chip.clamp{color:var(--warn);background:var(--warn-bg)}.msg .line{display:block}.msg .dim{color:var(--ink-2)}.composer{display:flex;gap:8px;padding:12px 16px;border-top:1px solid var(--line)}.composer input{flex:1 1;padding:10px 12px;border:1px solid var(--line);border-radius:8px;font:inherit;outline:none}.composer input:focus{border-color:var(--accent)}.composer button{padding:10px 18px;border:none;border-radius:8px;background:var(--accent);color:#fff;font:inherit;font-weight:600;cursor:pointer}.composer button:disabled{opacity:.5;cursor:default}.report-pane{min-height:0}.report-pane iframe{width:100%;height:100%;border:none}.center-screen{height:100vh;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:14px}.center-screen button{padding:10px 22px;border:1px solid var(--line);border-radius:8px;background:var(--surface);font:inherit;font-weight:600;cursor:pointer}.center-screen button:hover{background:var(--panel)}.error-banner{background:var(--fail-bg);color:var(--fail);padding:8px 20px;font-size:13.5px}.signout{border:none;background:none;color:var(--ink-3);font-size:12.5px;cursor:pointer}.upload-btn{padding:6px 14px;border:1px solid var(--line);border-radius:8px;background:var(--surface);font:inherit;font-size:13.5px;font-weight:600;cursor:pointer}.upload-btn:hover{background:var(--panel)}.upload-btn:disabled{opacity:.5;cursor:default}.fix-btn{display:block;margin-top:8px;padding:7px 14px;border:none;border-radius:8px;background:var(--accent);color:#fff;font:inherit;font-size:13.5px;font-weight:600;cursor:pointer}table.diff{border-collapse:collapse;margin:8px 0 4px;font-size:12.5px;width:100%;font-feature-settings:"tnum";font-variant-numeric:tabular-nums}table.diff th{text-align:left;color:var(--ink-3);font-weight:600;font-size:11px;text-transform:uppercase;letter-spacing:.04em;padding:2px 10px 2px 0}table.diff td{padding:3px 10px 3px 0;border-top:1px solid var(--line);vertical-align:top}table.diff td.old{color:var(--ink-3);text-decoration:line-through}table.diff td.new{color:var(--ink);font-weight:600}table.diff .chip{margin-left:6px;font-size:11px}.chip.src-measured{color:var(--pass);background:var(--pass-bg)}.chip.src-rule{color:var(--warn);background:var(--warn-bg)}.chip.src-default{color:var(--accent);background:#ddf4ff}.chip.src-invariant{color:var(--ink-2);background:var(--panel)}.profile-select{padding:6px 10px;border:1px solid var(--line);border-radius:8px;background:var(--surface);font:inherit;font-size:13px;max-width:240px;cursor:pointer}