:root{color-scheme:light;--background:#f5f7f8;--panel:#ffffff;--panel-muted:#eef2f3;--border:#d7dee2;--text:#162024;--muted:#617077;--accent:#0f766e;--accent-strong:#0b5f59;--danger:#b42318;--shadow:0 18px 50px rgba(22,32,36,0.08)}*{box-sizing:border-box}body,html{height:100%;margin:0}body{background:var(--background);color:var(--text);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif}button,select,textarea{font:inherit}button{cursor:pointer}.app-shell{display:grid;grid-template-columns:280px minmax(0,1fr);height:100vh;min-height:620px}.sidebar{gap:18px;min-width:0;padding:22px;background:#172326;color:#f8fbfb}.brand,.sidebar{display:flex;flex-direction:column}.brand{gap:4px}.brand h1{margin:0;font-size:22px;line-height:1.2;letter-spacing:0}.brand 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rgba(22,32,36,.08)}.messages{display:flex;flex-direction:column;gap:16px;min-height:0;padding:28px 24px;overflow-y:auto}.empty-state{display:grid;place-items:center;min-height:100%;color:var(--muted);text-align:center}.empty-state div{max-width:440px}.empty-state h2{margin:0 0 8px;color:var(--text);font-size:28px;line-height:1.2;letter-spacing:0}.empty-state p{margin:0;line-height:1.55}.message{display:flex}.message.user{justify-content:flex-end}.bubble{max-width:min(760px,86%);border-radius:8px;padding:13px 15px;line-height:1.55;white-space:pre-wrap;box-shadow:var(--shadow)}.message.assistant .bubble{background:var(--panel);border:1px solid var(--border)}.message.user .bubble{background:#dff4ef;border:1px solid #b8dfd7}.composer{padding:18px 24px 22px;border-top:1px solid var(--border);background:rgba(255,255,255,.86)}.composer-form{display:grid;grid-template-columns:minmax(0,1fr) 108px;grid-gap:10px;gap:10px;max-width:980px;margin:0 auto}.composer 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span{color:var(--muted);font-size:12px;font-weight:650;line-height:1}.model-select{min-height:38px;border:1px solid var(--border);border-radius:8px;background:var(--panel);color:var(--text);padding:0 36px 0 12px;font-size:14px;font-weight:650;outline:none}.model-select:focus{border-color:var(--accent);box-shadow:0 0 0 3px rgba(15,118,110,.14)}.model-select:disabled{cursor:not-allowed;opacity:.62}.topbar-actions{display:flex;align-items:center;justify-content:flex-end;gap:10px;flex-wrap:wrap}.admin-link,.ghost-button,.ghost-link,.save-button{display:inline-flex;align-items:center;justify-content:center;min-height:38px;border-radius:8px;padding:0 13px;font-size:14px;font-weight:650;text-decoration:none}.admin-link,.ghost-button,.ghost-link{border:1px solid var(--border);background:var(--panel);color:var(--text)}.save-button{border:0;background:var(--accent);color:#fff}.save-button:hover{background:var(--accent-strong)}.auth-panel{border-bottom:1px solid 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dt,.account-summary span{font-size:12px;font-weight:750;text-transform:uppercase}.account-summary strong{display:block;min-width:0;margin-top:9px;overflow:hidden;font-size:28px;line-height:1.15;text-overflow:ellipsis;white-space:nowrap}.account-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));grid-gap:16px;gap:16px}.account-card{padding:20px}.account-card-wide{grid-column:1/-1}.account-card h2{margin:0 0 16px;font-size:22px;line-height:1.25}.account-details{display:grid;grid-gap:12px;gap:12px;margin:0 0 20px}.account-details div{display:grid;grid-gap:4px;gap:4px}.account-details dd{min-width:0;margin:0;overflow-wrap:anywhere}.account-form{display:grid;grid-gap:12px;gap:12px}.account-form label{display:grid;grid-gap:7px;gap:7px;color:var(--muted);font-size:14px;font-weight:700}.account-form input{min-height:44px;border:1px solid var(--border);border-radius:8px;padding:0 12px;color:var(--text);font:inherit;outline:none}.account-form 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