:root{--bg:#f3f4f6;--panel:#ffffff;--ink:#12161c;--muted:#5b6472;--line:#e2e5ea;--line-strong:#c9ced6;--accent:#d2431b}*{box-sizing:border-box}body,html{height:100%}body{margin:0;background:var(--bg);color:var(--ink);font-family:system-ui,-apple-system,Segoe UI,sans-serif;font-size:15px}button,input,select,textarea{font:inherit;color:inherit}button{cursor:pointer}.topbar{display:flex;flex-wrap:wrap;align-items:center;gap:12px 16px;padding:12px 20px;background:var(--panel);border-bottom:1px solid var(--line)}.logo{gap:10px;text-decoration:none;color:inherit}.logo,.logo-mark{display:flex;align-items:center;font-weight:700}.logo-mark{width:28px;height:28px;border-radius:7px;background:var(--accent);color:#fff;justify-content:center}.spacer{flex:1 1}.muted{color:var(--muted);font-size:13px}.btn{min-height:44px;padding:8px 16px;border-radius:8px;border:1px solid var(--line-strong);background:#fff;font-weight:600;font-size:14px;text-decoration:none;display:inline-flex;align-items:center;justify-content:center}.btn-accent{background:var(--accent);border-color:var(--accent);color:#fff}.btn-dark{background:var(--ink);border-color:var(--ink);color:#fff}.btn:disabled{opacity:.55;cursor:not-allowed}.input{min-height:44px;padding:8px 12px;border-radius:8px;border:1px solid var(--line-strong);background:#fff;width:100%}.page{max-width:920px;margin:0 auto;padding:28px 20px;display:flex;flex-direction:column;gap:20px}.card{background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:18px 20px}.row{display:flex;flex-wrap:wrap;gap:10px;align-items:center}.site-list{list-style:none;margin:0;padding:0}.site-list li{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:8px;padding:14px 0;border-top:1px solid var(--line)}.site-list li:first-child{border-top:0}.mono{font-family:ui-monospace,JetBrains Mono,monospace;font-size:12px;color:var(--muted)}.error{color:#b3261e;font-size:14px}.login{max-width:360px;margin:14vh auto;padding:0 20px}.builder{display:flex;flex-wrap:wrap;min-height:calc(100vh - 69px)}.chat{flex:0 1 400px;min-width:300px;display:flex;flex-direction:column;background:var(--panel);border-right:1px solid var(--line);height:calc(100vh - 69px)}.chat-head{padding:14px 20px;border-bottom:1px solid var(--line)}.chat-log{flex:1 1;overflow-y:auto;padding:16px 20px;display:flex;flex-direction:column;gap:14px}.msg-user{align-self:flex-end;max-width:88%;background:var(--ink);color:#fff;border-radius:14px 14px 4px 14px;padding:10px 14px;line-height:1.45}.msg-ai,.msg-user{white-space:pre-wrap}.msg-ai{max-width:94%;line-height:1.5}.msg-note{font-size:13px;color:#1e7a46}.chat-form{padding:14px 20px;border-top:1px solid var(--line);display:flex;flex-direction:column;gap:10px}.chat-form textarea{width:100%;height:76px;resize:none;border:1px solid var(--line-strong);border-radius:10px;padding:10px 12px;background:#fff}.chips{display:flex;flex-wrap:wrap;gap:8px}.chip{border:1px solid var(--line-strong);background:#fff;border-radius:999px;padding:8px 14px;font-size:13px;min-height:44px}.stage{flex:999 1 560px;min-width:0;padding:16px 20px;flex-direction:column;gap:12px;height:calc(100vh - 69px)}.seg,.stage{display:flex}.seg{border:1px solid var(--line-strong);border-radius:8px;overflow:hidden;background:#fff}.seg button{border:0;background:#fff;padding:8px 14px;font-size:13px;min-height:44px}.seg button[aria-pressed=true]{background:var(--ink);color:#fff;font-weight:600}.frame-wrap{flex:1 1;min-height:0;display:flex;justify-content:center;background:#e9ebef;border:1px solid var(--line-strong);border-radius:10px;overflow:auto}.frame-wrap iframe{border:0;background:#fff;height:100%;max-width:100%}.versions{max-height:220px;overflow-y:auto}@media (max-width:800px){.chat,.stage{height:auto}.chat,.stage,.stage .frame-wrap{min-height:60vh}}