style.css

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background: linear-gradient(135deg, #dc143c 0%, #8b0000 100%);
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
}

.container {
    width: 100%;
    max-width: 900px;
    height: 90vh;
    background: white;
    border-radius: 20px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    position: relative;
}

header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

h1 {
    font-size: 24px;
    font-weight: 600;
}

.model-info {
    display: flex;
    align-items: center;
    gap: 15px;
}

.model-name {
    background: rgba(255, 255, 255, 0.2);
    padding: 5px 12px;
    border-radius: 20px;
    font-size: 14px;
}

.device-toggle {
    display: flex;
    align-items: center;
    gap: 10px;
}

.switch {
    position: relative;
    display: inline-block;
    width: 50px;
    height: 24px;
}

.switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(255, 255, 255, 0.3);
    transition: .4s;
    border-radius: 24px;
}

.slider:before {
    position: absolute;
    content: "";
    height: 18px;
    width: 18px;
    left: 3px;
    bottom: 3px;
    background-color: white;
    transition: .4s;
    border-radius: 50%;
}

input:checked + .slider {
    background-color: #4CAF50;
}

input:checked + .slider:before {
    transform: translateX(26px);
}

#deviceLabel {
    font-size: 14px;
    font-weight: 500;
}

.chat-container {
    flex: 1;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.message {
    display: flex;
    gap: 12px;
    animation: fadeIn 0.3s ease-in;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.message.user {
    flex-direction: row-reverse;
}

.message-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    font-weight: 600;
    flex-shrink: 0;
}

.message.assistant .message-avatar {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.message.user .message-avatar {
    background: #e0e0e0;
    color: #333;
}

.message-content {
    max-width: 70%;
    padding: 12px 16px;
    border-radius: 18px;
    line-height: 1.5;
    word-wrap: break-word;
}

.message.assistant .message-content {
    background: #f5f5f5;
    color: #333;
    border-bottom-left-radius: 4px;
}

.message.user .message-content {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border-bottom-right-radius: 4px;
}

.message-content.error {
    background: #ffebee;
    color: #c62828;
}

.loading-indicator {
    padding: 0 20px 10px;
}

.loading-indicator.hidden {
    display: none;
}

.typing-dots {
    display: flex;
    gap: 4px;
    padding: 0 40px;
}

.typing-dots span {
    width: 8px;
    height: 8px;
    background: #999;
    border-radius: 50%;
    animation: typing 1.4s infinite ease-in-out;
}

.typing-dots span:nth-child(1) {
    animation-delay: -0.32s;
}

.typing-dots span:nth-child(2) {
    animation-delay: -0.16s;
}

@keyframes typing {
    0%, 80%, 100% {
        transform: scale(1);
        opacity: 0.5;
    }
    40% {
        transform: scale(1.3);
        opacity: 1;
    }
}

.input-container {
    padding: 20px;
    background: #fafafa;
    border-top: 1px solid #e0e0e0;
    display: flex;
    gap: 12px;
    align-items: flex-end;
}

.user-input {
    flex: 1;
    padding: 12px 16px;
    border: 2px solid #e0e0e0;
    border-radius: 12px;
    font-size: 16px;
    resize: none;
    font-family: inherit;
    transition: border-color 0.3s;
}

.user-input:focus {
    outline: none;
    border-color: #667eea;
}

.user-input:disabled {
    background: #f5f5f5;
    cursor: not-allowed;
}

.send-button {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border: none;
    color: white;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.2s, box-shadow 0.2s;
}

.send-button:hover:not(:disabled) {
    transform: scale(1.05);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.4);
}

.send-button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.init-loader {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.98);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.init-loader.hidden {
    display: none;
}

.loader-content {
    text-align: center;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 4px solid #e0e0e0;
    border-top: 4px solid #667eea;
    border-radius: 50%;
    margin: 0 auto 20px;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.loader-content p {
    color: #333;
    font-size: 18px;
    margin-bottom: 8px;
}

.loader-subtitle {
    color: #666;
    font-size: 14px;
}

.error-message {
    text-align: center;
    padding: 20px;
}

.error-detail {
    color: #c62828;
    font-size: 14px;
    margin: 10px 0 20px;
}

.error-message button {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 16px;
}

@media (max-width: 768px) {
    .container {
        height: 100vh;
        max-width: 100%;
        border-radius: 0;
    }
    
    .message-content {
        max-width: 85%;
    }
    
    h1 {
        font-size: 20px;
    }
    
    .model-name {
        display: none;
    }
}