:root{--primary:#1447e6;--primary-hover:#0f38c4;--primary-soft:#1447e61a;--bg:#fff;--bg-chat:#f8f8fa;--surface:#fff;--surface-hover:#f2f2f5;--border:#e5e5e9;--text:#1e1e24;--text-secondary:#6b6b76;--text-faint:#9a9aa4;--bubble-user:#1447e6;--bubble-user-text:#fff;--bubble-assistant:#f2f2f5;--code-bg:#eef0f4;--chip-bg:#fff;--good:#1a8a4a;--warn:#b5860b;--bad:#d5393f;--shadow-sm:0 1px 2px #14141e0a;--shadow-md:0 4px 12px #14141e14;--shadow-lg:0 12px 24px #14141e1f;--transition:all .2s cubic-bezier(.4, 0, .2, 1)}@media (prefers-color-scheme:dark){:root{--bg:#131316;--bg-chat:#0e0e11;--surface:#1c1c21;--surface-hover:#26262c;--border:#2d2d35;--text:#f0f0f3;--text-secondary:#9ea0a8;--text-faint:#666870;--bubble-user:#1447e6;--bubble-user-text:#fff;--bubble-assistant:#1c1c21;--code-bg:#16161a;--chip-bg:#26262c;--good:#4fbd7d;--warn:#dcae3a;--bad:#ef5a5f;--shadow-sm:0 1px 2px #0003;--shadow-md:0 8px 24px #0006;--shadow-lg:0 16px 40px #0009}}*{box-sizing:border-box;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}html,body{height:100vh;margin:0;overflow:hidden}body{background:var(--bg-chat);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Inter,Helvetica,Arial,sans-serif;transition:background .2s,color .2s}.sidebar{background:var(--surface);border-right:1px solid var(--border);z-index:100;flex-direction:column;flex-shrink:0;width:260px;height:100%;transition:width .3s 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8px}.nav-item{width:100%;color:var(--text-secondary);cursor:pointer;transition:var(--transition);white-space:nowrap;background:0 0;border:none;border-radius:10px;align-items:center;gap:12px;padding:10px 12px;font-size:14px;font-weight:500;display:flex;overflow:hidden}.nav-item:hover{background:var(--surface-hover);color:var(--text)}.nav-item svg{flex-shrink:0}.sidebar-section-label{text-transform:uppercase;letter-spacing:.08em;color:var(--text-faint);padding:16px 20px 8px;font-size:11px;font-weight:700}.divider{background:var(--border);height:1px;margin:8px 0}.recent-list{flex-direction:column;flex:1;gap:4px;padding:0 8px;display:flex;overflow-y:auto}.recent-item{width:100%;color:var(--text-secondary);cursor:pointer;text-align:left;transition:var(--transition);white-space:nowrap;background:0 0;border:none;border-radius:10px;align-items:center;gap:10px;padding:10px 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.remove-file:hover{color:var(--bad)}.composer{background:var(--surface);border:1px solid var(--border);box-shadow:var(--shadow-md);border-radius:20px;align-items:flex-end;gap:8px;padding:10px 12px;transition:border-color .2s;display:flex}.composer:focus-within{border-color:var(--text-faint);box-shadow:var(--shadow-lg)}.composer.has-file{border-radius:0 0 20px 20px}.composer-input{resize:none;color:var(--text);background:0 0;border:none;outline:none;flex:1;max-height:180px;padding:8px 4px;font-family:inherit;font-size:15px;line-height:1.5}.composer-input::placeholder{color:var(--text-faint)}.icon-btn{border:1px solid var(--border);background:var(--surface);width:40px;height:40px;color:var(--text-secondary);cursor:pointer;transition:var(--transition);border-radius:12px;justify-content:center;align-items:center;display:flex}.icon-btn:hover{background:var(--surface-hover);color:var(--text);border-color:var(--text-faint)}.send-btn{background:var(--primary);color:#fff;cursor:pointer;width:40px;height:40px;transition:var(--transition);border:none;border-radius:12px;justify-content:center;align-items:center;display:flex}.send-btn:hover:not(:disabled){background:var(--primary-hover);transform:translateY(-1px)}.send-btn:active:not(:disabled){transform:translateY(0)}.send-btn:disabled{opacity:.3;cursor:not-allowed;background:var(--text-faint)}.hint{text-align:center;color:var(--text-faint);margin-top:10px;font-size:12px}@media (width<=768px){footer{padding:12px 16px 16px}.composer{border-radius:16px}.composer.has-file{border-radius:0 0 16px 16px}.hint{font-size:11px}}