:root[data-theme=dark]{--bg-primary: #1E1E1E;--bg-secondary: #131314;--chat-user: #2B3A55;--chat-ai: #2A2A2A;--text-primary: #E8EAED;--text-secondary: #9AA0A6;--accent: #4285F4;--border: #3C4043;--input-bg: #2A2A2A;--hover-bg: #303134}:root[data-theme=light]{--bg-primary: #FFFFFF;--bg-secondary: #F0F4F9;--chat-user: #E3E3E3;--chat-ai: #F0F4F9;--text-primary: #1F1F1F;--text-secondary: #444746;--accent: #0B57D0;--border: #E0E0E0;--input-bg: #F0F4F9;--hover-bg: #E1E5EA}*{box-sizing:border-box;margin:0;padding:0}body{font-family:Google Sans,Roboto,Arial,sans-serif;background-color:var(--bg-primary);color:var(--text-primary);line-height:1.5;height:100vh;display:flex;flex-direction:column;transition:background-color .3s,color .3s}.app-container{display:flex;flex-direction:column;height:100%;max-width:1000px;margin:0 auto;width:100%}.header{display:flex;justify-content:space-between;align-items:center;padding:16px 24px;background-color:var(--bg-primary);border-bottom:1px solid var(--border);z-index:10}.header-left{display:flex;align-items:center;gap:12px}.header-logo{height:32px;object-fit:contain}.welcome-logo{height:64px;object-fit:contain;margin-bottom:16px}.icon-btn{background:transparent;border:none;color:var(--text-secondary);cursor:pointer;padding:8px;border-radius:50%;display:flex;align-items:center;justify-content:center;transition:background-color .2s,color .2s}.icon-btn:hover{background-color:var(--hover-bg);color:var(--text-primary)}.chat-container{flex:1;overflow-y:auto;padding:24px;display:flex;flex-direction:column;gap:24px;scroll-behavior:smooth}.welcome-screen{display:flex;flex-direction:column;align-items:center;justify-content:center;height:100%;color:var(--text-secondary);text-align:center;gap:16px}.welcome-screen h2{font-size:24px;font-weight:400;color:var(--text-primary)}.large-icon{font-size:48px;color:var(--accent)}.message{display:flex;gap:16px;max-width:85%;animation:fadeIn .3s ease-in-out}.message.user{align-self:flex-end;flex-direction:row-reverse}.message.ai{align-self:flex-start}.message.continuation{margin-top:-16px}.avatar{width:36px;height:36px;border-radius:50%;display:flex;align-items:center;justify-content:center;flex-shrink:0}.user .avatar{background-color:var(--accent);color:#fff}.ai .avatar{background-color:transparent;border-radius:0;width:48px}.ai .avatar img{width:100%;height:100%;object-fit:contain}.message-content{padding:12px 16px;border-radius:18px;font-size:16px;word-break:break-word;position:relative}.user .message-content{background-color:var(--chat-user);border-bottom-right-radius:4px}.ai .message-content{background-color:var(--chat-ai);border-bottom-left-radius:4px}.message-actions{display:flex;gap:8px;margin-top:8px;opacity:0;transition:opacity .2s}.message.ai:hover .message-actions{opacity:1}.typing-indicator{display:flex;gap:4px;padding:8px 12px;align-items:center}.dot{width:8px;height:8px;background-color:var(--text-secondary);border-radius:50%;animation:bounce 1.4s infinite ease-in-out both}.dot:nth-child(1){animation-delay:-.32s}.dot:nth-child(2){animation-delay:-.16s}.input-area{padding:16px 24px 15vh;background-color:var(--bg-primary)}.input-wrapper{display:flex;align-items:flex-end;background-color:var(--input-bg);border-radius:24px;padding:8px 16px;border:1px solid var(--border);transition:border-color .2s}.input-wrapper:focus-within{border-color:var(--accent)}textarea{flex:1;background:transparent;border:none;color:var(--text-primary);font-family:inherit;font-size:15px;resize:none;padding:8px 0;max-height:200px;outline:none;line-height:1.5}textarea::placeholder{color:var(--text-secondary)}.send-btn{color:var(--accent);margin-bottom:4px;margin-left:8px}.send-btn:disabled{color:var(--text-secondary);cursor:not-allowed;opacity:.5}.footer-text{text-align:center;font-size:12px;color:var(--text-secondary);margin-top:12px}@keyframes fadeIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}@keyframes bounce{0%,80%,to{transform:scale(0)}40%{transform:scale(1)}}@media(max-width:768px){.message{max-width:95%}.header{padding:12px 16px}.chat-container{padding:16px}.input-area{padding:12px 16px 15vh}}.ai .message-content p{margin-bottom:12px}.ai .message-content p:last-child{margin-bottom:0}.ai .message-content h1{font-size:1.8em;font-weight:700;margin:16px 0 12px;line-height:1.3}.ai .message-content h2{font-size:1.5em;font-weight:600;margin:14px 0 10px;line-height:1.3}.ai .message-content h3{font-size:1.25em;font-weight:600;margin:12px 0 8px;line-height:1.3}.ai .message-content h1:first-child,.ai .message-content h2:first-child,.ai .message-content h3:first-child{margin-top:0}.ai .message-content ul,.ai .message-content ol{margin-bottom:12px;padding-left:24px}.ai .message-content li{margin-bottom:4px}.ai .message-content li:last-child{margin-bottom:0}.ai .message-content a{color:var(--accent);text-decoration:none}.ai .message-content a:hover{text-decoration:underline}.ai .message-content blockquote{border-left:4px solid var(--border);padding-left:12px;color:var(--text-secondary);margin-bottom:12px;font-style:italic}.ai .message-content strong,.ai .message-content b{font-weight:600}.ai .message-content pre{background-color:var(--bg-primary);padding:12px;border-radius:8px;overflow-x:auto;margin:12px 0;border:1px solid var(--border)}.ai .message-content code{font-family:monospace;font-size:14px;background-color:var(--bg-primary);padding:2px 4px;border-radius:4px}.ai .message-content pre code{padding:0;background-color:transparent}.modal-overlay{position:fixed;top:0;left:0;right:0;bottom:0;background-color:#00000080;display:flex;align-items:center;justify-content:center;z-index:100}.modal-content{background-color:var(--bg-primary);padding:24px;border-radius:12px;max-width:400px;width:90%;border:1px solid var(--border);box-shadow:0 4px 24px #0003}.modal-content h3{margin-bottom:8px;font-weight:500;color:var(--text-primary)}.modal-content p{color:var(--text-secondary);margin-bottom:24px}.modal-actions{display:flex;justify-content:flex-end;gap:12px}.btn-secondary,.btn-primary{padding:8px 16px;border-radius:4px;border:none;cursor:pointer;font-family:inherit;font-size:14px;font-weight:500;transition:background-color .2s}.btn-secondary{background-color:transparent;color:var(--text-primary)}.btn-secondary:hover{background-color:var(--hover-bg)}.btn-primary{background-color:#d93025;color:#fff}.btn-primary:hover{background-color:#b3261e}