:root{--bg-primary: #212121;--bg-secondary: #171717;--bg-tertiary: #2f2f2f;--bg-input: #303030;--bg-user-bubble: #303030;--bg-assistant-bubble: transparent;--text-primary: #ececec;--text-secondary: #b4b4b4;--text-placeholder: #8e8e8e;--accent: #a8a8a8;--accent-hover: #ffffff;--border-color: #424242;--border-input: #525252;--scrollbar-hover: #888;--selection-bg: rgba(168, 168, 168, .3);--radius-sm: 8px;--radius-md: 16px;--radius-lg: 24px;--radius-full: 9999px;--shadow-sm: 0 1px 3px rgba(0, 0, 0, .3);--shadow-md: 0 4px 12px rgba(0, 0, 0, .4);--max-chat-width: 768px;--header-height: 56px;--input-area-height: auto;--transition-fast: .15s ease;--transition-normal: .25s ease}[data-theme=light]{--bg-primary: #ffffff;--bg-secondary: #f5f5f5;--bg-tertiary: #e8e8e8;--bg-input: #f0f0f0;--bg-user-bubble: #e9e9e9;--bg-assistant-bubble: transparent;--text-primary: #1a1a1a;--text-secondary: #6b6b6b;--text-placeholder: #9e9e9e;--accent: #555555;--accent-hover: #000000;--border-color: #dcdcdc;--border-input: #ccc;--scrollbar-hover: #999;--selection-bg: rgba(100, 100, 100, .2);--shadow-sm: 0 1px 3px rgba(0, 0, 0, .08);--shadow-md: 0 4px 12px rgba(0, 0, 0, .1)}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{font-size:16px;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}body{font-family:Montserrat,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;background-color:var(--bg-primary);color:var(--text-primary);line-height:1.6;min-height:100dvh;overflow:hidden}::-webkit-scrollbar{width:6px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:var(--border-color);border-radius:var(--radius-full)}::-webkit-scrollbar-thumb:hover{background:var(--scrollbar-hover)}::selection{background-color:var(--selection-bg)}a{color:inherit;text-decoration:none}button{font-family:inherit;cursor:pointer;border:none;background:none;color:inherit}input,textarea{font-family:inherit;font-size:inherit;color:inherit;border:none;background:none;outline:none}ul,ol{list-style:none}.chat-container{display:flex;flex-direction:column;height:100dvh;max-width:var(--max-chat-width);margin:0 auto;position:relative}.chat-header{display:flex;align-items:center;justify-content:space-between;height:var(--header-height);padding:0 20px;flex-shrink:0}.chat-header-left{display:flex;align-items:center;gap:10px}.chat-header-title{font-family:Open Sans,sans-serif;font-size:1.05rem;font-weight:600;letter-spacing:-.01em;color:var(--text-primary)}.chat-header-left .material-symbols-outlined{font-size:22px;color:var(--text-secondary)}.theme-toggle-button{width:36px;height:36px;border-radius:var(--radius-full);display:flex;align-items:center;justify-content:center;color:var(--text-secondary);transition:background-color var(--transition-fast),color var(--transition-fast)}.theme-toggle-button:hover{background-color:var(--bg-tertiary);color:var(--text-primary)}.theme-toggle-button .material-symbols-outlined{font-size:20px}.message-list{flex:1;overflow-y:auto;padding:8px 16px 24px;display:flex;flex-direction:column;gap:24px;scroll-behavior:smooth}.empty-state{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:12px;color:var(--text-secondary);user-select:none}.empty-state .material-symbols-outlined{font-size:48px;opacity:.4}.empty-state p{font-size:.95rem;opacity:.6}.message-row{display:flex;gap:12px;animation:fadeSlideIn .3s var(--transition-normal) both}.message-row.user{justify-content:flex-end}.message-row.assistant{justify-content:flex-start}.message-avatar{width:28px;height:28px;border-radius:var(--radius-full);display:flex;align-items:center;justify-content:center;flex-shrink:0;margin-top:2px}.message-row.assistant .message-avatar{background-color:var(--bg-tertiary);border:1px solid var(--border-color)}.message-avatar .material-symbols-outlined{font-size:16px;color:var(--text-secondary)}.message-bubble{max-width:80%;padding:10px 16px;border-radius:var(--radius-md);font-size:.935rem;line-height:1.65;word-wrap:break-word;white-space:pre-wrap}.message-row.user .message-bubble{background-color:var(--bg-user-bubble);border-radius:var(--radius-md) var(--radius-md) 4px var(--radius-md)}.message-row.assistant .message-bubble{background-color:var(--bg-assistant-bubble);border-radius:var(--radius-md) var(--radius-md) var(--radius-md) 4px}.typing-indicator{display:flex;gap:5px;padding:4px 0;align-items:center}.typing-indicator span{width:7px;height:7px;border-radius:50%;background-color:var(--text-secondary);animation:typingBounce 1.4s infinite ease-in-out}.typing-indicator span:nth-child(1){animation-delay:0s}.typing-indicator span:nth-child(2){animation-delay:.2s}.typing-indicator span:nth-child(3){animation-delay:.4s}.typing-bubble{display:flex;align-items:center;gap:10px}.typing-shimmer-text{font-family:SF Mono,Fira Code,Fira Mono,Menlo,monospace;font-size:.82rem;margin:0;letter-spacing:-.01em}.chat-input-area{padding:12px 16px 24px;flex-shrink:0}.chat-input-wrapper{display:flex;align-items:flex-end;gap:8px;background-color:var(--bg-input);border:1px solid var(--border-input);border-radius:var(--radius-lg);padding:8px 12px;transition:border-color var(--transition-fast)}.chat-input-wrapper:focus-within{border-color:var(--accent)}.chat-input-wrapper textarea{flex:1;resize:none;background:transparent;color:var(--text-primary);font-size:.935rem;line-height:1.5;padding:6px 4px;max-height:160px;overflow-y:auto;scrollbar-width:none}.chat-input-wrapper textarea::placeholder{color:var(--text-placeholder)}.chat-input-wrapper textarea::-webkit-scrollbar{display:none}.send-button{width:36px;height:36px;border-radius:var(--radius-full);display:flex;align-items:center;justify-content:center;background-color:var(--text-primary);color:var(--bg-primary);flex-shrink:0;transition:opacity var(--transition-fast),transform var(--transition-fast)}.send-button:hover:not(:disabled){opacity:.85;transform:scale(1.05)}.send-button:disabled{opacity:.3;cursor:not-allowed}.send-button .material-symbols-outlined{font-size:20px}@keyframes fadeSlideIn{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}@keyframes typingBounce{0%,80%,to{transform:scale(.6);opacity:.4}40%{transform:scale(1);opacity:1}}@media(max-width:600px){.message-bubble{max-width:90%}.chat-input-area{padding:10px 10px 16px}}