*,*:before,*:after{margin:0;padding:0;box-sizing:border-box}:root{--bg-primary: #0a0a0f;--bg-secondary: #12121a;--bg-card: #1a1a25;--bg-input: #0f0f18;--border: #2a2a3a;--border-focus: #6366f1;--text-primary: #e8e8f0;--text-secondary: #8888a0;--text-muted: #555568;--accent: #6366f1;--accent-hover: #818cf8;--accent-glow: rgba(99, 102, 241, .3);--success: #22c55e;--error: #ef4444;--error-bg: rgba(239, 68, 68, .1);--radius: 12px;--radius-sm: 8px;--transition: .2s ease}body{font-family:Noto Sans SC,Inter,system-ui,-apple-system,sans-serif;background:var(--bg-primary);color:var(--text-primary);min-height:100vh;-webkit-font-smoothing:antialiased}#root{min-height:100vh}.app-container{max-width:1200px;margin:0 auto;padding:32px 24px;min-height:100vh;display:flex;flex-direction:column}.header{margin-bottom:32px}.header h1{font-size:28px;font-weight:700;letter-spacing:-.5px;background:linear-gradient(135deg,#e8e8f0,#6366f1);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.header p{color:var(--text-secondary);margin-top:6px;font-size:14px}.main-grid{display:grid;grid-template-columns:380px 1fr;gap:24px;flex:1}.sidebar{display:flex;flex-direction:column;gap:16px}.card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:20px}.card-title{font-size:13px;font-weight:600;color:var(--text-secondary);text-transform:uppercase;letter-spacing:.5px;margin-bottom:14px}.prompt-textarea{width:100%;min-height:120px;padding:14px;background:var(--bg-input);border:1px solid var(--border);border-radius:var(--radius-sm);color:var(--text-primary);font-family:inherit;font-size:14px;line-height:1.6;resize:vertical;outline:none;transition:border-color var(--transition)}.prompt-textarea::placeholder{color:var(--text-muted)}.prompt-textarea:focus{border-color:var(--border-focus);box-shadow:0 0 0 3px var(--accent-glow)}.file-upload{position:relative;display:flex;align-items:center;gap:10px;padding:10px 14px;background:var(--bg-input);border:1px dashed var(--border);border-radius:var(--radius-sm);cursor:pointer;transition:border-color var(--transition)}.file-upload:hover{border-color:var(--text-muted)}.file-upload input{position:absolute;top:0;right:0;bottom:0;left:0;opacity:0;cursor:pointer}.file-upload-text{font-size:13px;color:var(--text-secondary)}.file-upload-icon{font-size:18px;color:var(--text-muted)}.btn-primary{width:100%;padding:12px 20px;background:var(--accent);color:#fff;border:none;border-radius:var(--radius-sm);font-family:inherit;font-size:15px;font-weight:600;cursor:pointer;transition:all var(--transition);position:relative;overflow:hidden}.btn-primary:hover:not(:disabled){background:var(--accent-hover);box-shadow:0 4px 20px var(--accent-glow)}.btn-primary:disabled{opacity:.5;cursor:not-allowed}.btn-primary.loading{background:var(--bg-card);border:1px solid var(--border)}.btn-download{display:flex;align-items:center;justify-content:center;gap:8px;width:100%;padding:12px 20px;background:transparent;color:var(--success);border:1px solid var(--success);border-radius:var(--radius-sm);font-family:inherit;font-size:14px;font-weight:500;text-decoration:none;cursor:pointer;transition:all var(--transition)}.btn-download:hover{background:#22c55e1a}.error-msg{padding:10px 14px;background:var(--error-bg);border:1px solid rgba(239,68,68,.3);border-radius:var(--radius-sm);color:var(--error);font-size:13px;line-height:1.5}.viewer-container{background:var(--bg-secondary);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;position:relative;min-height:500px}.viewer-empty{position:absolute;top:0;right:0;bottom:0;left:0;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:12px;color:var(--text-muted);pointer-events:none}.viewer-empty-icon{font-size:48px;opacity:.3}.viewer-empty-text{font-size:14px}.spinner{display:inline-block;width:18px;height:18px;border:2px solid var(--text-muted);border-top-color:var(--accent);border-radius:50%;animation:spin .8s linear infinite;vertical-align:middle;margin-right:8px}@keyframes spin{to{transform:rotate(360deg)}}.btn-new-chat{padding:8px 16px;background:transparent;color:var(--text-secondary);border:1px dashed var(--border);border-radius:var(--radius-sm);font-family:inherit;font-size:13px;cursor:pointer;transition:all var(--transition)}.btn-new-chat:hover{color:var(--text-primary);border-color:var(--text-muted);background:var(--bg-card)}.chat-history{display:flex;flex-direction:column;gap:8px;max-height:300px;overflow-y:auto;padding:4px}.chat-history::-webkit-scrollbar{width:4px}.chat-history::-webkit-scrollbar-track{background:transparent}.chat-history::-webkit-scrollbar-thumb{background:var(--border);border-radius:2px}.chat-msg{display:flex}.chat-msg-user{justify-content:flex-end}.chat-msg-assistant{justify-content:flex-start}.chat-bubble{max-width:85%;padding:8px 12px;border-radius:var(--radius-sm);font-size:13px;line-height:1.5;word-break:break-word}.chat-bubble-user{background:var(--accent);color:#fff;border-bottom-right-radius:2px}.chat-bubble-assistant{background:var(--bg-card);border:1px solid var(--border);color:var(--text-secondary);border-bottom-left-radius:2px;display:flex;align-items:center;gap:8px}.chat-view-btn{background:none;border:none;color:var(--accent);font-size:12px;cursor:pointer;padding:0;font-family:inherit}.chat-view-btn:hover{color:var(--accent-hover);text-decoration:underline}.sidebar-input{margin-top:auto}@media(max-width:768px){.main-grid{grid-template-columns:1fr}.viewer-container{min-height:350px}}