:root{--bg: #f5f5fa;--card: #ffffff;--text: #0f172a;--muted: #64748b;--border: #e2e4eb;--bubble-user: linear-gradient(135deg, #8b5cf6, #ec4899);--bubble-asst: var(--card);--input-focus: rgba(139,92,246,.25);--btn: linear-gradient(135deg, #8b5cf6, #ec4899)}[data-theme=dark]{--bg: #0a0a14;--card: #12122a;--text: #f1f1f6;--muted: rgba(255,255,255,.35);--border: rgba(255,255,255,.06);--bubble-asst: #12122a;--input-focus: rgba(139,92,246,.35)}*{box-sizing:border-box}body{margin:0;background:var(--bg);font-family:ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial;color:var(--text);transition:background .3s,color .3s}.nav-wrap{max-width:900px;margin:0 auto;padding:24px;display:flex;flex-direction:column;height:100vh;gap:12px}.nav-top{display:flex;align-items:center;justify-content:space-between;gap:12px}.nav-top-left{display:flex;align-items:center;gap:10px}.nav-title{font-size:22px;font-weight:900;margin:0;letter-spacing:-.3px}.nav-title-icon{font-size:24px}.nav-subtitle{font-size:12px;color:var(--muted);margin:2px 0 0}.nav-actions{display:flex;align-items:center;gap:8px}.nav-theme-btn{width:36px;height:36px;border-radius:10px;border:1px solid var(--border);background:var(--card);color:var(--muted);display:grid;place-items:center;cursor:pointer;font-size:16px;transition:all .15s}.nav-theme-btn:hover{border-color:#8b5cf64d}.nav-reset{-webkit-appearance:none;-moz-appearance:none;appearance:none;border:1px solid var(--border);background:var(--card);color:var(--text);font-weight:700;padding:8px 16px;border-radius:10px;cursor:pointer;font-size:12px;transition:all .15s}.nav-reset:hover{border-color:#ef44444d;color:#ef4444}.nav-reset:disabled{opacity:.5;cursor:default}.nav-chat{flex:1;overflow-y:auto;display:flex;flex-direction:column;gap:10px;padding:20px;border:1px solid var(--border);border-radius:16px;background:var(--card)}.nav-msg{padding:12px 16px;border-radius:16px;max-width:78%;font-size:14px;line-height:1.55}.nav-msgText{white-space:pre-wrap;word-break:break-word}.nav-msg.is-assistant{background:var(--bubble-asst);align-self:flex-start;border:1px solid var(--border)}.nav-msg.is-user{background:var(--bubble-user);color:#fff;align-self:flex-end;border:none}[data-theme=dark] .nav-msg.is-assistant{background:#ffffff08;border-color:#ffffff0f}.nav-inputWrap{display:flex;gap:10px;align-items:stretch}.nav-inputWrap textarea{flex:1;min-height:56px;resize:none;padding:14px;border-radius:14px;border:1px solid var(--border);font-size:14px;outline:none;background:var(--card);color:var(--text);font-family:inherit;transition:all .15s}.nav-inputWrap textarea::placeholder{color:var(--muted)}.nav-inputWrap textarea:focus{border-color:#8b5cf666;box-shadow:0 0 0 4px var(--input-focus)}.nav-inputWrap button{min-width:80px;padding:0 20px;border-radius:14px;border:none;background:var(--btn);color:#fff;font-weight:800;font-size:13px;cursor:pointer;transition:all .15s}.nav-inputWrap button:hover{transform:translateY(-1px);box-shadow:0 6px 20px #8b5cf64d}.nav-inputWrap button:disabled{opacity:.4;cursor:default;transform:none;box-shadow:none}.nav-footer{text-align:center;font-size:9px;color:var(--muted);padding:4px 0}@media (max-width: 640px){.nav-wrap{padding:14px}.nav-title{font-size:18px}.nav-msg{max-width:90%}}