:root{--linkedin-blue:#0077b5;--linkedin-dark-blue:#004182;--linkedin-light-blue:#70b5f9;--text-primary:#000;--text-secondary:#666;--text-light:#999;--bg-primary:#fff;--bg-secondary:#f3f2ef;--bg-tertiary:#f8f9fa;--border-color:#e0e0e0;--border-light:#f0f0f0;--shadow-light:0 1px 3px #0000001a;--shadow-medium:0 4px 12px #00000026;--border-radius:12px;--border-radius-small:8px;--transition:all 0.2s ease}*{box-sizing:border-box;margin:0;padding:0}body{background-color:#f3f2ef;background-color:var(--bg-secondary);color:#000;color:var(--text-primary);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;line-height:1.6}.linkspark-container{display:flex;height:100vh;overflow:hidden}.sidebar{background:#fff;background:var(--bg-primary);border-right:1px solid #e0e0e0;border-right:1px solid var(--border-color);box-shadow:0 1px 3px #0000001a;box-shadow:var(--shadow-light);display:flex;flex-direction:column;position:relative;transition:all .2s ease;transition:var(--transition);width:280px}.sidebar.collapsed{width:60px}.sidebar-header{border-bottom:1px solid #f0f0f0;border-bottom:1px solid var(--border-light);justify-content:space-between;min-height:80px;padding:20px}.logo,.sidebar-header{align-items:center;display:flex}.logo{color:#0077b5;color:var(--linkedin-blue);font-weight:700;gap:12px}.logo-icon{align-items:center;background:linear-gradient(135deg,#0077b5,#70b5f9);background:linear-gradient(135deg,var(--linkedin-blue),var(--linkedin-light-blue));border-radius:8px;color:#fff;display:flex;font-size:18px;height:32px;justify-content:center;width:32px}.logo-text{font-size:20px}.collapse-btn{background:none;border:none;border-radius:8px;border-radius:var(--border-radius-small);color:#666;color:var(--text-secondary);cursor:pointer;font-size:14px;padding:8px;transition:all .2s ease;transition:var(--transition)}.collapse-btn:hover{background:#f8f9fa;background:var(--bg-tertiary);color:#0077b5;color:var(--linkedin-blue)}.new-chat-btn{align-items:center;background:#0077b5;background:var(--linkedin-blue);border:none;border-radius:12px;border-radius:var(--border-radius);color:#fff;cursor:pointer;display:flex;font-size:14px;font-weight:600;gap:8px;margin:20px;padding:12px 16px;transition:all .2s ease;transition:var(--transition)}.new-chat-btn:hover{background:#004182;background:var(--linkedin-dark-blue);box-shadow:0 4px 12px #00000026;box-shadow:var(--shadow-medium);transform:translateY(-1px)}.btn-icon{font-size:16px}.chat-history{flex:1 1;overflow-y:auto;padding:0 20px}.history-header{color:#666;color:var(--text-secondary);font-size:12px;font-weight:600;letter-spacing:.5px;margin-bottom:12px;padding:0 4px;text-transform:uppercase}.chat-item{align-items:center;border-radius:8px;border-radius:var(--border-radius-small);cursor:pointer;display:flex;justify-content:space-between;margin-bottom:4px;overflow:hidden;padding:12px 8px;position:relative;transition:all .2s ease;transition:var(--transition)}.chat-item:hover{background:#f8f9fa;background:var(--bg-tertiary)}.chat-item.active{background:linear-gradient(135deg,#0077b5,#70b5f9);background:linear-gradient(135deg,var(--linkedin-blue),var(--linkedin-light-blue));color:#fff}.chat-content{flex:1 1;min-width:0}.chat-title{font-size:14px;font-weight:600;margin-bottom:2px}.chat-preview,.chat-title{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.chat-preview{font-size:12px;opacity:.7}.chat-actions{display:flex;gap:4px;opacity:0;transition:all .2s ease;transition:var(--transition)}.chat-item:hover .chat-actions{opacity:1}.delete-btn,.star-btn{background:none;border:none;border-radius:4px;color:inherit;cursor:pointer;font-size:12px;padding:4px;transition:all .2s ease;transition:var(--transition)}.star-btn.starred{color:gold}.delete-btn:hover,.star-btn:hover{background:#0000001a}.main-content{background:#fff;background:var(--bg-primary);display:flex;flex:1 1;flex-direction:column}.chat-header{background:linear-gradient(135deg,#f8f9fa,#fff);border-bottom:1px solid #f0f0f0;border-bottom:1px solid var(--border-light);padding:30px 40px;text-align:center}.app-title{align-items:center;color:#0077b5;color:var(--linkedin-blue);display:flex;font-size:28px;font-weight:700;gap:12px;justify-content:center;margin-bottom:8px}.title-icon{font-size:32px}.app-subtitle{color:#666;color:var(--text-secondary);font-size:16px;font-weight:400}.messages-container{flex:1 1;overflow-y:auto;padding:20px}.welcome-screen{align-items:center;display:flex;flex-direction:column;height:100%;justify-content:center;margin:0 auto;max-width:800px;text-align:center}.welcome-icon{font-size:64px;margin-bottom:24px}.welcome-screen h2{color:#0077b5;color:var(--linkedin-blue);font-size:32px;font-weight:700;margin-bottom:16px}.welcome-screen p{color:#666;color:var(--text-secondary);font-size:18px;margin-bottom:40px}.example-prompts{grid-gap:24px;display:grid;gap:24px;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));width:100%}.prompt-category h4{align-items:center;color:#0077b5;color:var(--linkedin-blue);display:flex;font-size:16px;font-weight:600;gap:8px;margin-bottom:12px}.prompt-category button{background:#f8f9fa;background:var(--bg-tertiary);border:1px solid #f0f0f0;border:1px solid var(--border-light);border-radius:12px;border-radius:var(--border-radius);color:#000;color:var(--text-primary);cursor:pointer;display:block;font-size:14px;margin-bottom:8px;padding:12px 16px;text-align:left;transition:all .2s ease;transition:var(--transition);width:100%}.prompt-category button:hover{background:#0077b5;background:var(--linkedin-blue);border-color:#0077b5;border-color:var(--linkedin-blue);box-shadow:0 4px 12px #00000026;box-shadow:var(--shadow-medium);color:#fff;transform:translateY(-2px)}.messages-list{margin:0 auto;max-width:900px;width:100%}.message{animation:fadeIn .3s ease;display:flex;margin-bottom:24px}.message.user{flex-direction:row-reverse}.message-avatar{align-items:center;border-radius:50%;display:flex;flex-shrink:0;font-size:18px;height:40px;justify-content:center;margin:0 12px;width:40px}.message.user .message-avatar{background:#f8f9fa;background:var(--bg-tertiary);border:2px solid #e0e0e0;border:2px solid var(--border-color)}.message.bot .message-avatar{background:linear-gradient(135deg,#0077b5,#70b5f9);background:linear-gradient(135deg,var(--linkedin-blue),var(--linkedin-light-blue));color:#fff}.message-content{max-width:70%;position:relative}.message.user .message-content{background:#0077b5;background:var(--linkedin-blue);border-radius:20px 20px 4px 20px;color:#fff;padding:16px 20px}.message.bot .message-content{background:#f8f9fa;background:var(--bg-tertiary);border:1px solid #f0f0f0;border:1px solid var(--border-light);border-radius:20px 20px 20px 4px;color:#000;color:var(--text-primary);padding:16px 20px}.message-text{word-wrap:break-word;font-size:15px;line-height:1.5}.message-text strong{font-weight:600}.message-text em{font-style:italic}.message-text code{background:#0000001a;border-radius:4px;font-family:Monaco,Menlo,monospace;font-size:13px;padding:2px 6px}.message.user .message-text 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typing{0%,80%,to{opacity:.5;transform:scale(.8)}40%{opacity:1;transform:scale(1)}}.input-container{background:#fff;background:var(--bg-primary);border-top:1px solid #f0f0f0;border-top:1px solid var(--border-light);padding:20px 40px 30px}.input-wrapper{align-items:flex-end;background:#fff;border:2px solid #e0e0e0;border:2px solid var(--border-color);border-radius:24px;box-shadow:0 1px 3px #0000001a;box-shadow:var(--shadow-light);display:flex;margin:0 auto;max-width:900px;padding:8px 8px 8px 20px;transition:all .2s ease;transition:var(--transition)}.input-wrapper:focus-within{border-color:#0077b5;border-color:var(--linkedin-blue);box-shadow:0 0 0 3px #0077b51a}.message-input{background:#0000;border:none;flex:1 1;font-family:inherit;font-size:15px;line-height:1.5;outline:none;padding:12px 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(max-width:768px){.sidebar{height:100%;position:absolute;z-index:1000}.sidebar.collapsed{transform:translateX(-100%);width:280px}.main-content{margin-left:0}.chat-header{padding:20px}.app-title{font-size:24px}.input-container{padding:15px 20px 20px}.input-wrapper{padding:6px 6px 6px 16px}.message-content{max-width:85%}.example-prompts{gap:16px;grid-template-columns:1fr}.messages-container{padding:15px}.welcome-screen h2{font-size:28px}.welcome-screen p{font-size:16px}}@media (max-width:480px){.app-title{flex-direction:column;font-size:20px;gap:8px}.title-icon{font-size:28px}.app-subtitle{font-size:14px}.input-wrapper{border-radius:20px;padding:4px 4px 4px 12px}.action-btn{font-size:14px;height:36px;width:36px}.message-content{max-width:90%}.message-avatar{font-size:14px;height:32px;margin:0 8px;width:32px}.welcome-icon{font-size:48px}.welcome-screen 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