:root{--bg:#faf9f6;--bg-elevated:#ffffff;--sidebar-bg:#f4f2ec;--border:#e5e1d8;--text:#262521;--text-muted:#74706a;--text-faint:#a19c92;--accent:#c2603f;--accent-hover:#a94f32;--accent-soft:#f1ded4;--danger:#b3261e;--danger-bg:#fbeae8;--success:#1f7a34;--success-bg:#e3f3e6;--radius-sm:6px;--radius:10px;--radius-lg:16px;--shadow-sm:0 1px 2px rgba(38,37,33,0.05);--shadow-md:0 8px 24px rgba(38,37,33,0.08);--font:-apple-system,BlinkMacSystemFont,"Segoe UI",Inter,Roboto,Helvetica,Arial,sans-serif}*{box-sizing:border-box}body,html{height:100%}body{margin:0;font-family:var(--font);background:var(--bg);color:var(--text);-webkit-font-smoothing:antialiased}button,input,select,textarea{font-family:inherit;color:inherit}a{color:var(--accent)}.auth-page{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:24px}.auth-card{width:100%;max-width:380px;background:var(--bg-elevated);border:1px solid var(--border);border-radius:var(--radius-lg);padding:32px;box-shadow:var(--shadow-md);display:flex;flex-direction:column;gap:20px}.auth-card h1{margin:0;font-size:1.4rem;font-weight:600}.field{display:flex;flex-direction:column;gap:6px;font-size:.85rem;color:var(--text-muted);font-weight:600}.field input{padding:10px 12px;border:1px solid var(--border);border-radius:var(--radius-sm);font-size:.95rem;color:var(--text);background:var(--bg-elevated)}.field input:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft)}.btn{cursor:pointer;border:none;border-radius:var(--radius-sm);padding:10px 16px;font-size:.9rem;font-weight:600;transition:background .15s ease}.btn-primary{background:var(--accent);color:#fff}.btn-primary:hover:not(:disabled){background:var(--accent-hover)}.btn-primary:disabled{opacity:.6;cursor:not-allowed}.btn-secondary{background:var(--sidebar-bg);color:var(--text);border:1px solid 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button:hover{background:rgba(38,37,33,.05)}.conversation-item[aria-current=true] button{background:var(--accent-soft);color:var(--accent-hover);font-weight:600}.chat-main{flex:1 1;min-width:0;display:flex;flex-direction:column}.chat-topbar{display:flex;align-items:center;justify-content:flex-end;padding:12px 24px;border-bottom:1px solid var(--border)}.model-select select{border:1px solid var(--border);border-radius:var(--radius-sm);padding:6px 10px;font-size:.85rem;background:var(--bg-elevated)}.model-select label{display:flex;align-items:center;gap:8px;font-size:.8rem;color:var(--text-muted);font-weight:600}.message-list{flex:1 1;overflow-y:auto;padding:24px;display:flex;flex-direction:column;gap:16px}.message{max-width:70%;padding:12px 16px;border-radius:var(--radius-lg);line-height:1.5;font-size:.95rem}.message p{margin:0;white-space:pre-wrap}.message[data-role=USER]{align-self:flex-end;background:var(--accent);color:#fff;border-bottom-right-radius:4px}.message[data-role=ASSISTANT]{align-self:flex-start;background:var(--bg-elevated);border:1px solid var(--border);border-bottom-left-radius:4px}.composer{display:flex;flex-direction:column;gap:8px;padding:16px 24px 24px;border-top:1px solid var(--border)}.attachments{display:flex;flex-wrap:wrap;gap:8px}.attachment-chip{display:inline-flex;align-items:center;background:var(--sidebar-bg);border:1px solid var(--border);border-radius:999px;padding:4px 12px;font-size:.78rem;color:var(--text-muted)}.composer-row{display:flex;gap:8px;align-items:flex-end}.composer-row textarea{flex:1 1;resize:none;min-height:48px;max-height:200px;padding:12px 14px;border:1px solid var(--border);border-radius:var(--radius);font-size:.95rem}.composer-row textarea:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft)}.file-upload-label{display:inline-flex;align-items:center;gap:6px;cursor:pointer;padding:10px 14px;border:1px solid var(--border);border-radius:var(--radius-sm);font-size:.85rem;color:var(--text-muted);background:var(--bg-elevated);white-space:nowrap}.file-upload-label:hover{background:var(--sidebar-bg)}.file-upload-label input{display:none}.admin-page{max-width:960px;margin:0 auto;padding:40px 24px;display:flex;flex-direction:column;gap:32px}.admin-page h1{margin:0 0 8px;font-size:1.5rem}.admin-section{background:var(--bg-elevated);border:1px solid var(--border);border-radius:var(--radius-lg);padding:24px;display:flex;flex-direction:column;gap:16px}.admin-section h2{margin:0;font-size:1.05rem}.data-table{width:100%;border-collapse:collapse;font-size:.88rem}.data-table th{text-align:left;color:var(--text-muted);font-weight:600;font-size:.75rem;text-transform:uppercase;letter-spacing:.03em;padding:8px 12px}.data-table td,.data-table th{border-bottom:1px solid 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