:root{--bg: #f5f7fb;--surface: #ffffff;--text: #1b2430;--muted: #64718a;--primary: #1a365d;--primary-soft: #dbe2f5;--accent: #f6ad55;--border: #e3e8f0;--ok: #2f855a;--bad: #c53030;--radius: 14px;--nav-h: 60px;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Heebo,Assistant,Arial,sans-serif}*{box-sizing:border-box}html,body,#root{height:100%;margin:0}body{background:var(--bg);color:var(--text);font-size:16px;-webkit-font-smoothing:antialiased}a{color:var(--primary)}button{font:inherit;cursor:pointer}input,select,textarea{font:inherit;color:inherit}h1{font-size:1.5rem;margin:0 0 8px}h2{font-size:1.15rem;margin:20px 0 8px}h3{font-size:1rem;margin:0 0 6px}.muted{color:var(--muted)}.small{font-size:.85rem}.mono{font-family:ui-monospace,Menlo,monospace;font-size:.78rem}.center{text-align:center}.big{font-size:1.6rem;font-weight:700}.error{background:#fde8e8;color:var(--bad);padding:8px 12px;border-radius:10px;margin-top:8px}.notice{background:#fff7e6;color:#8a5a00;padding:6px 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var(--border);background:var(--surface)}.composer textarea{flex:1;resize:none;max-height:140px}@media(max-width:820px){.shell{flex-direction:column}.nav{position:fixed;bottom:0;inset-inline:0;top:auto;height:auto;width:auto;flex-direction:row;justify-content:space-around;padding:6px 4px calc(6px + env(safe-area-inset-bottom));border-inline-end:0;border-top:1px solid var(--border);z-index:10}.brand,.nav-spacer,.nav-user{display:none}.nav-link{flex-direction:column;gap:2px;padding:6px 8px;font-size:.72rem}.nav-icon{font-size:1.2rem}.main{padding-bottom:var(--nav-h)}.chat{height:calc(100vh - var(--nav-h))}.history{position:fixed;inset:0 0 var(--nav-h) 0;width:auto;z-index:20;transform:translate(100%);transition:transform .2s}.history.open{transform:none}.history-head .link,.thread-head .link{display:inline}.msg.assistant 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