:root{--bg-primary: #0A0A0A;--bg-secondary: #111111;--bg-surface: #161616;--bg-surface-hover: #1C1C1C;--bg-input: #1A1A1A;--border: #2A2A2A;--border-light: #333333;--text-primary: #E5E5E5;--text-secondary: #888888;--text-tertiary: #555555;--accent: #007FFF;--accent-hover: #0066CC;--accent-dim: rgba(0, 127, 255, .12);--accent-glow: rgba(0, 127, 255, .25);--danger: #E53935;--danger-dim: rgba(229, 57, 53, .12);--success: #4CAF50;--radius-sm: 6px;--radius-md: 10px;--radius-lg: 16px;--radius-full: 9999px;--font-sans: "Inter", -apple-system, BlinkMacSystemFont, sans-serif;--font-mono: "JetBrains Mono", "Fira Code", monospace;--transition-fast: .12s ease;--transition-normal: .2s ease;--shadow-sm: 0 1px 3px rgba(0,0,0,.4);--shadow-md: 0 4px 12px rgba(0,0,0,.5);--shadow-lg: 0 8px 32px rgba(0,0,0,.6);--sidebar-width: 280px}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html,body,#root{height:100%;width:100%;overflow:hidden}body{font-family:var(--font-sans);background:var(--bg-primary);color:var(--text-primary);font-size:14px;line-height:1.6;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}::-webkit-scrollbar{width:6px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:var(--border-light);border-radius:var(--radius-full)}::-webkit-scrollbar-thumb:hover{background:var(--text-tertiary)}::selection{background:var(--accent-dim);color:var(--accent)}.message-user .message-content ::selection,.message-user .message-content::selection{background:#ffffff4d;color:#fff}:focus-visible{outline:2px solid var(--accent);outline-offset:2px}button{font-family:inherit;cursor:pointer;border:none;background:none;color:inherit;font-size:inherit}.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;padding:8px 16px;border-radius:var(--radius-md);font-weight:500;font-size:13px;transition:all var(--transition-fast);white-space:nowrap;-webkit-user-select:none;user-select:none}.btn-primary{background:var(--accent);color:#fff}.btn-primary:hover:not(:disabled){background:var(--accent-hover)}.btn-primary:disabled{opacity:.4;cursor:not-allowed}.btn-ghost{color:var(--text-secondary);background:transparent}.btn-ghost:hover:not(:disabled){background:var(--bg-surface-hover);color:var(--text-primary)}.btn-danger{color:var(--danger)}.btn-danger:hover:not(:disabled){background:var(--danger-dim)}.btn-icon{padding:8px;border-radius:var(--radius-sm)}input[type=text],input[type=password],input[type=search],textarea{font-family:inherit;font-size:14px;color:var(--text-primary);background:var(--bg-input);border:1px solid var(--border);border-radius:var(--radius-md);padding:10px 14px;width:100%;transition:border-color var(--transition-fast);resize:none}input:focus,textarea:focus{border-color:var(--accent);outline:none}input::placeholder,textarea::placeholder{color:var(--text-tertiary)}.auth-page{height:100%;display:flex;align-items:center;justify-content:center;padding:20px}.auth-card{width:100%;max-width:400px;padding:40px 32px;background:var(--bg-surface);border:1px solid var(--border);border-radius:var(--radius-lg);box-shadow:var(--shadow-lg)}.auth-card h1{font-size:24px;font-weight:700;margin-bottom:8px;color:var(--text-primary)}.auth-card p{color:var(--text-secondary);font-size:13px;margin-bottom:24px;line-height:1.5}.auth-card .field{margin-bottom:16px}.auth-card label{display:block;font-size:12px;font-weight:500;color:var(--text-secondary);margin-bottom:6px;text-transform:uppercase;letter-spacing:.5px}.auth-card .btn{width:100%;padding:12px;font-size:14px;margin-top:8px}.auth-card .error{color:var(--danger);font-size:12px;margin-top:8px}.auth-card 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var(--transition-normal)}.sidebar-header{padding:12px 20px;border-bottom:1px solid var(--border);display:flex;align-items:center;gap:12px;background:var(--bg-secondary);min-height:56px}.sidebar-header h2{font-size:15px;font-weight:600;flex:1}.sidebar-search{padding:8px 12px;border-bottom:1px solid var(--border)}.sidebar-search input{font-size:13px;padding:8px 12px;border-radius:var(--radius-sm);background:var(--bg-primary)}.sidebar-content{flex:1;overflow-y:auto;padding:8px}.sidebar-footer{padding:12px;border-top:1px solid var(--border);display:none}.nickname-trigger{display:flex;align-items:center;gap:6px;cursor:pointer;padding:4px 8px;border-radius:var(--radius-sm);transition:background var(--transition-fast);-webkit-user-select:none;user-select:none;flex:1;min-width:0}.nickname-trigger:hover{background:var(--bg-surface-hover)}.nickname-trigger h2{font-size:15px;font-weight:600;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.nickname-trigger 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a{color:var(--accent);text-decoration:none}.md-content a:hover{text-decoration:underline}.md-content code{font-family:var(--font-mono);font-size:12px;background:var(--bg-primary);border:1px solid var(--border);border-radius:4px;padding:1px 5px}.md-content pre{margin:8px 0;border-radius:var(--radius-sm);overflow:hidden;position:relative}.md-content pre code{display:block;padding:12px 14px;background:var(--bg-primary);border:1px solid var(--border);border-radius:var(--radius-sm);overflow-x:auto;font-size:12px;line-height:1.5}.code-header{display:flex;justify-content:space-between;align-items:center;padding:4px 12px;background:#1a1a1a;border:1px solid var(--border);border-bottom:none;border-radius:var(--radius-sm) var(--radius-sm) 0 0;font-size:11px;color:var(--text-tertiary)}.code-header+pre code{border-top-left-radius:0;border-top-right-radius:0}.copy-btn{font-size:11px;color:var(--text-tertiary);padding:2px 8px;border-radius:4px;transition:all 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.btn-send.ghost:hover{background:var(--bg-surface-hover);color:var(--text-primary)}.model-selector{position:relative}.model-selector-trigger{display:flex;align-items:center;gap:6px;padding:6px 10px;border-radius:var(--radius-sm);border:1px solid var(--border);background:var(--bg-input);color:var(--text-secondary);font-size:12px;cursor:pointer;transition:all var(--transition-fast)}.model-selector-trigger:hover{border-color:var(--accent);color:var(--text-primary)}.model-dropdown{position:absolute;top:100%;right:0;margin-top:4px;width:260px;background:var(--bg-surface);border:1px solid var(--border);border-radius:var(--radius-md);box-shadow:var(--shadow-md);z-index:100;padding:4px;opacity:0;visibility:hidden;transform:translateY(-4px);transition:all var(--transition-fast)}.model-dropdown.open{opacity:1;visibility:visible;transform:translateY(0)}.model-option{display:flex;align-items:center;gap:8px;padding:8px 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var(--border);border-radius:var(--radius-md);box-shadow:var(--shadow-md);font-size:13px;z-index:300;opacity:0;transition:all var(--transition-normal);pointer-events:none}.toast.visible{transform:translate(-50%) translateY(0);opacity:1}