:root{--primary-color: #007bff;--secondary-color: #6c757d;--success-color: #28a745;--danger-color: #dc3545;--light-color: #f8f9fa;--dark-color: #343a40;--text-color: #333;--background-color: #ffffff;--navbar-bg: #ffffff;--button-bg: #007bff;--button-text: #ffffff;--button-hover-bg: #0056b3}body.dark-mode{--text-color: #ffffff;--background-color: #1a1a1a;--navbar-bg: #1a1a1a;--button-bg: #444;--button-text: #ffffff;--button-hover-bg: #555}body.light-mode{--text-color: #333333;--background-color: #ffffff;--navbar-bg: #ffffff;--button-bg: #007bff;--button-text: #ffffff;--button-hover-bg: #0056b3}*{margin:0;padding:0;box-sizing:border-box}body{font-family:monospace,sans-serif;background-color:var(--background-color);color:var(--text-color);transition:background-color .3s ease,color .3s ease}.navbar{display:flex;justify-content:space-between;align-items:center;padding:1rem 2rem;background-color:var(--navbar-bg);box-shadow:0 2px 10px #0000001a;position:sticky;top:0;z-index:1000;transition:background-color .3s ease,box-shadow .3s ease,transform .3s ease;animation:slideDown .5s ease}.navbar.scrolled{background-color:#ffffffe6;box-shadow:0 2px 20px #0003;transform:translateY(-10px)}.navbar-title{font-size:1.5rem;font-weight:700;color:var(--text-color);margin:0;animation:fadeIn .5s ease}.navbar-links{display:flex;gap:1.5rem}.navbar-links a{text-decoration:none;color:var(--text-color);font-weight:500;transition:color .3s ease,transform .3s ease}.navbar-links a:hover{transform:translateY(-2px)}@keyframes slideDown{0%{transform:translateY(-100%)}to{transform:translateY(0)}}@keyframes fadeIn{0%{opacity:0;transform:translateY(-20px)}to{opacity:1;transform:translateY(0)}}@keyframes slideIn{0%{opacity:0;transform:translate(-20px)}to{opacity:1;transform:translate(0)}}.navbar-links a{animation:slideIn .5s ease forwards;opacity:0}.navbar-links a:nth-child(1){animation-delay:.2s}.navbar-links a:nth-child(2){animation-delay:.4s}.navbar-links a:nth-child(3){animation-delay:.6s}.navbar-links a:nth-child(4){animation-delay:.8s}.mode-toggle{padding:.5rem 1rem;border:none;border-radius:25px;background-color:var(--button-bg);color:var(--button-text);font-size:1rem;cursor:pointer;transition:background-color .3s ease,transform .3s ease;display:flex;align-items:center;gap:.5rem;animation:fadeIn .5s ease}.mode-toggle:hover{background-color:var(--button-hover-bg);transform:scale(1.05)}.mode-toggle:active{transform:scale(.95)}.welcome-container{display:flex;flex-direction:column;justify-content:center;align-items:center;height:100vh;background:var(--background-color);color:var(--text-color);text-align:center;padding:20px;animation:fadeIn 1s ease}.title{font-size:2.5rem;font-weight:700;margin:0;color:var(--text-color);animation:slideIn 1s ease}.description{font-size:1.2rem;max-width:600px;margin:2rem 0;color:var(--text-color);line-height:1.6;opacity:0;animation:fadeIn 1.5s ease forwards}.start-button{padding:15px 30px;border:none;border-radius:25px;background-color:var(--primary-color);color:#fff;font-size:1.1rem;font-weight:700;cursor:pointer;transition:background-color .3s ease,transform .3s ease;animation:bounce 2s infinite}.start-button:hover{background-color:var(--button-hover-bg);transform:scale(1.05)}.start-button:active{transform:scale(.95)}.chat-container{max-width:800px;margin:0 auto;padding:20px;border-radius:12px;background-color:var(--background-color);box-shadow:0 4px 20px #0000001a;transition:background-color .3s ease,box-shadow .3s ease}.chat-title{text-align:center;font-size:2rem;margin-bottom:20px;color:var(--text-color)}.chat-box{height:400px;overflow-y:auto;padding:15px;margin-bottom:20px;border:1px solid #ddd;border-radius:8px;background-color:var(--light-color);transition:background-color .3s ease}.message{margin-bottom:15px;padding:10px 15px;border-radius:8px;max-width:70%;word-wrap:break-word;animation:fadeIn .5s ease}.user-message{background-color:var(--primary-color);color:#fff;align-self:flex-end}.ai-message{background-color:var(--light-color);color:var(--text-color);align-self:flex-start}.message-text{display:block;margin-bottom:5px}.language-tag{font-size:.8em;color:var(--secondary-color);display:block;margin-top:5px}.input-container{display:flex;align-items:center;gap:10px;padding:10px;border-top:1px solid #ddd}.chat-input{flex:1;padding:10px;border:1px solid #ddd;border-radius:8px;resize:none;font-size:16px;background-color:var(--background-color);color:var(--text-color);transition:border-color .3s ease,background-color .3s ease}.chat-input:focus{border-color:var(--primary-color);outline:none}.send-button,.audio-button{padding:10px;border:none;border-radius:50%;background-color:var(--primary-color);color:#fff;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:background-color .3s ease,transform .3s ease}.send-button:hover,.audio-button:hover{background-color:var(--button-hover-bg);transform:scale(1.1)}.send-button:disabled{background-color:var(--secondary-color);cursor:not-allowed}.audio-button.recording{background-color:var(--danger-color)}.language-selector{margin:20px 0;display:flex;align-items:center;gap:10px}.language-selector label{font-size:1em;color:var(--text-color)}.language-selector select{padding:8px 12px;font-size:1em;border:1px solid #ddd;border-radius:8px;background-color:var(--background-color);color:var(--text-color);cursor:pointer;transition:border-color .3s ease,box-shadow .3s ease}.language-selector select:hover{border-color:var(--primary-color)}.language-selector select:focus{outline:none;border-color:var(--primary-color);box-shadow:0 0 5px #007bff80}.language-selector select{-webkit-appearance:none;-moz-appearance:none;appearance:none;background-image:url(data:image/svg+xml;charset=US-ASCII,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20width%3D%22292.4%22%20height%3D%22292.4%22%3E%3Cpath%20fill%3D%22%23333%22%20d%3D%22M287%2069.4a17.6%2017.6%200%200%200-13-5.4H18.4c-5%200-9.3%201.8-12.9%205.4A17.6%2017.6%200%200%200%200%2082.2c0%205%201.8%209.3%205.4%2012.9l128%20127.9c3.6%203.6%207.8%205.4%2012.8%205.4s9.2-1.8%2012.8-5.4L287%2095c3.5-3.5%205.4-7.8%205.4-12.8%200-5-1.9-9.2-5.5-12.8z%22%2F%3E%3C%2Fsvg%3E);background-repeat:no-repeat;background-position:right 10px center;background-size:12px;padding-right:30px}.error{color:var(--danger-color);font-size:.9em;margin-top:10px;text-align:center}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@keyframes slideIn{0%{transform:translateY(-20px);opacity:0}to{transform:translateY(0);opacity:1}}@keyframes bounce{0%,20%,50%,80%,to{transform:translateY(0)}40%{transform:translateY(-20px)}60%{transform:translateY(-10px)}}@media (max-width: 768px){.chat-container{padding:15px}.chat-title{font-size:1.5rem}.chat-box{height:300px}.input-container{flex-direction:column}.chat-input{width:100%}.send-button,.audio-button{width:100%;border-radius:8px}.title{font-size:2rem}.description{font-size:1rem}.start-button{padding:12px 24px;font-size:1rem}}