:root{--bg: #f3f4f6;--card: #ffffff;--text: #0f172a;--muted: #64748b;--border: #e5e7eb;--dark: #0f172a;--shadow: 0 10px 25px rgba(15, 23, 42, .06)}*{box-sizing:border-box}body{margin:0;background:var(--bg);font-family:system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial;color:var(--text)}.nav-wrap{max-width:980px;margin:0 auto;padding:28px;display:flex;flex-direction:column;height:100vh;gap:14px}.nav-top{display:flex;align-items:center;justify-content:space-between;gap:12px}.nav-title{font-size:30px;font-weight:800;margin:0;letter-spacing:-.02em}.nav-reset{-webkit-appearance:none;-moz-appearance:none;appearance:none;border:1px solid var(--border);background:var(--card);color:var(--text);font-weight:600;padding:10px 14px;border-radius:12px;cursor:pointer;box-shadow:0 2px 10px #0f172a0d}.nav-reset:hover{transform:translateY(-1px)}.nav-reset:disabled{opacity:.6;cursor:default;transform:none}.nav-chat{flex:1;overflow-y:auto;display:flex;flex-direction:column;gap:12px;padding:18px;border:1px solid var(--border);border-radius:18px;background:#ffffff8c;box-shadow:var(--shadow)}.nav-msg{padding:14px 16px;border-radius:16px;max-width:78%;font-size:15px;line-height:1.5;box-shadow:0 2px 10px #0f172a0a}.nav-msgText{white-space:pre-wrap;word-break:break-word;line-height:1.45}.nav-msg.is-assistant{background:var(--card);align-self:flex-start;border:1px solid var(--border)}.nav-msg.is-user{background:var(--dark);color:#fff;align-self:flex-end;border:1px solid rgba(255,255,255,.06)}.nav-inputWrap{display:flex;gap:12px;align-items:stretch}.nav-inputWrap textarea{flex:1;min-height:64px;resize:none;padding:14px;border-radius:14px;border:1px solid var(--border);font-size:14px;outline:none;background:var(--card);box-shadow:0 6px 18px #0f172a0f}.nav-inputWrap textarea:focus{border-color:#7c3aed59;box-shadow:0 0 0 4px #7c3aed24}.nav-inputWrap button{min-width:92px;padding:0 20px;border-radius:14px;border:1px solid rgba(15,23,42,.08);background:var(--dark);color:#fff;font-weight:700;cursor:pointer;box-shadow:0 10px 18px #0f172a2e}.nav-inputWrap button:hover{transform:translateY(-1px)}.nav-inputWrap button:disabled{opacity:.55;cursor:default;transform:none;box-shadow:none}@media (max-width: 640px){.nav-wrap{padding:16px}.nav-title{font-size:24px}.nav-msg{max-width:92%}.nav-inputWrap button{min-width:78px;padding:0 14px}}