:root{--merik-blue: #00b4d8;--merik-dark-blue: #0077b6;--merik-light-blue: #48cae4;--merik-accent: #90e0ef;--bg-primary: #f8f9fa;--bg-secondary: #ffffff;--text-primary: #2b2d42;--text-secondary: #6c757d;--text-light: #ffffff;--border-color: #dee2e6;--user-message: linear-gradient(135deg, #0077b6, #00b4d8);--assistant-message: #f1f3f5;--shadow-sm: 0 2px 4px rgba(0, 0, 0, .05);--shadow-md: 0 4px 12px rgba(0, 0, 0, .08);--shadow-lg: 0 8px 24px rgba(0, 0, 0, .12)}*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Fira Sans,Droid Sans,Helvetica Neue,sans-serif;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;background:var(--bg-primary);color:var(--text-primary)}.app{display:flex;flex-direction:column;height:100vh;overflow:hidden}.header{background:linear-gradient(135deg,var(--merik-dark-blue),var(--merik-blue));box-shadow:var(--shadow-md);z-index:100}.header-content{max-width:1400px;margin:0 auto;padding:20px 30px;display:flex;justify-content:space-between;align-items:center}.header-left{display:flex;align-items:center;gap:20px}.logo-container{width:60px;height:60px;background:#fff;border-radius:12px;display:flex;align-items:center;justify-content:center;box-shadow:var(--shadow-sm)}.logo{width:45px;height:45px;color:var(--merik-blue)}.header-text{color:#fff}.header-title{font-size:28px;font-weight:700;letter-spacing:-.5px;line-height:1.2}.merik-text{font-weight:900;letter-spacing:1px}.solutions-text{font-weight:300;opacity:.95}.header-subtitle{font-size:13px;opacity:.85;margin-top:4px;font-weight:400}.header-right{display:flex;align-items:center;gap:15px}.model-selector{background:#ffffff26;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border:1px solid rgba(255,255,255,.2);color:#fff;padding:10px 20px;border-radius:10px;font-size:14px;font-weight:500;cursor:pointer;transition:all .3s ease}.model-selector:hover{background:#ffffff40;border-color:#ffffff4d}.model-selector option{background:var(--merik-dark-blue);color:#fff}.chat-container{flex:1;display:flex;flex-direction:column;max-width:1200px;width:100%;margin:0 auto;padding:20px;overflow:hidden}.chat-messages{flex:1;overflow-y:auto;padding:20px;display:flex;flex-direction:column;gap:24px;background:var(--bg-secondary);border-radius:16px;box-shadow:var(--shadow-sm);margin-bottom:20px}.chat-messages::-webkit-scrollbar{width:8px}.chat-messages::-webkit-scrollbar-track{background:transparent}.chat-messages::-webkit-scrollbar-thumb{background:#cbd5e0;border-radius:4px}.chat-messages::-webkit-scrollbar-thumb:hover{background:#a0aec0}.welcome-screen{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:100%;padding:40px 20px}.welcome-hero{text-align:center;margin-bottom:50px}.welcome-icon{display:inline-flex;padding:20px;background:linear-gradient(135deg,var(--merik-light-blue),var(--merik-blue));border-radius:24px;margin-bottom:24px;color:#fff;box-shadow:var(--shadow-md)}.welcome-title{font-size:36px;font-weight:700;color:var(--text-primary);margin-bottom:12px}.welcome-subtitle{font-size:18px;color:var(--merik-blue);font-weight:600;margin-bottom:16px;font-style:italic}.welcome-description{font-size:16px;color:var(--text-secondary);max-width:600px;line-height:1.6}.example-prompts{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:16px;width:100%;max-width:900px}.example-prompt{background:#fff;border:2px solid var(--border-color);border-radius:12px;padding:20px;cursor:pointer;transition:all .3s ease;display:flex;gap:16px;align-items:flex-start}.example-prompt:hover{border-color:var(--merik-blue);transform:translateY(-4px);box-shadow:0 8px 20px #00b4d826}.example-icon{flex-shrink:0;width:48px;height:48px;background:linear-gradient(135deg,var(--merik-light-blue),var(--merik-blue));border-radius:10px;display:flex;align-items:center;justify-content:center;color:#fff}.example-content{flex:1}.example-title{font-size:16px;font-weight:600;color:var(--text-primary);margin-bottom:6px}.example-text{font-size:14px;color:var(--text-secondary);line-height:1.4}.message{display:flex;gap:16px;animation:slideIn .3s ease-out}@keyframes slideIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}.message.user{flex-direction:row-reverse}.message-avatar{flex-shrink:0;width:42px;height:42px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-weight:600;font-size:14px}.avatar-user{background:var(--user-message);color:#fff;width:100%;height:100%;display:flex;align-items:center;justify-content:center;border-radius:50%}.avatar-assistant{background:linear-gradient(135deg,var(--merik-light-blue),var(--merik-blue));color:#fff;width:100%;height:100%;display:flex;align-items:center;justify-content:center;border-radius:50%}.message-content{flex:1;max-width:75%;padding:16px 20px;border-radius:16px;line-height:1.6;font-size:15px}.message.user .message-content{background:var(--user-message);color:#fff;border-bottom-right-radius:6px}.message.assistant .message-content{background:var(--assistant-message);color:var(--text-primary);border-bottom-left-radius:6px}.message-content h1,.message-content h2,.message-content h3{margin:16px 0 8px;font-weight:600}.message-content p{margin:8px 0}.message-content ul,.message-content ol{margin:8px 0;padding-left:24px}.message-content li{margin:4px 0}.message-content code{background:#0000000d;padding:2px 6px;border-radius:4px;font-family:Courier New,monospace;font-size:14px}.message.user .message-content code{background:#fff3}.message-content pre{margin:12px 0;border-radius:8px;overflow:hidden}.message-content pre code{background:none;padding:0}.typing-indicator{display:flex;gap:6px;padding:16px 20px}.typing-dot{width:10px;height:10px;border-radius:50%;background:var(--merik-blue);animation:typing 1.4s infinite}.typing-dot:nth-child(2){animation-delay:.2s}.typing-dot:nth-child(3){animation-delay:.4s}@keyframes typing{0%,60%,to{transform:translateY(0);opacity:.4}30%{transform:translateY(-10px);opacity:1}}.input-container{background:var(--bg-secondary);border-radius:16px;box-shadow:var(--shadow-md);padding:20px}.input-wrapper{display:flex;gap:12px;align-items:flex-end;background:var(--bg-primary);padding:12px 16px;border-radius:14px;border:2px solid var(--border-color);transition:all .3s ease}.input-wrapper:focus-within{border-color:var(--merik-blue);box-shadow:0 0 0 3px #00b4d81a}.chat-input{flex:1;border:none;outline:none;background:transparent;font-size:16px;resize:none;max-height:150px;font-family:inherit;color:var(--text-primary)}.chat-input::placeholder{color:var(--text-secondary);opacity:.6}.chat-input:disabled{opacity:.5;cursor:not-allowed}.send-button{flex-shrink:0;width:44px;height:44px;background:linear-gradient(135deg,var(--merik-blue),var(--merik-dark-blue));border:none;border-radius:10px;color:#fff;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:all .3s ease;box-shadow:var(--shadow-sm)}.send-button:hover:not(:disabled){transform:translateY(-2px);box-shadow:0 6px 16px #0077b64d}.send-button:active:not(:disabled){transform:translateY(0)}.send-button:disabled{opacity:.5;cursor:not-allowed;transform:none}.input-footer{margin-top:12px;text-align:center}.input-hint{font-size:12px;color:var(--text-secondary);opacity:.7}@media (max-width: 768px){.header-content{padding:16px 20px}.header-title{font-size:22px}.header-subtitle{font-size:11px}.logo-container{width:50px;height:50px}.logo{width:35px;height:35px}.model-selector{padding:8px 12px;font-size:12px}.chat-container{padding:12px}.chat-messages{padding:16px;gap:16px}.message-content{max-width:85%;font-size:14px}.welcome-title{font-size:28px}.welcome-subtitle{font-size:16px}.example-prompts{grid-template-columns:1fr}.input-container{padding:16px}}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}.animate-spin{animation:spin 1s linear infinite}@keyframes spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Fira Sans,Droid Sans,Helvetica Neue,sans-serif;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}code{font-family:source-code-pro,Menlo,Monaco,Consolas,Courier New,monospace}*{box-sizing:border-box}