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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    color: #333;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    height: 100vh;
    display: flex;
    flex-direction: column;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
}

header {
    padding: 1rem 2rem;
    background: rgba(255, 255, 255, 0.9);
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

header h1 {
    font-size: 1.5rem;
    font-weight: 600;
    color: #4a5568;
}

.model-status {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 0.5rem;
}

#model-status {
    font-size: 0.9rem;
    color: #666;
    font-weight: 500;
}

.loading-progress {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 0.25rem;
}

.progress-bar {
    width: 200px;
    height: 4px;
    background: rgba(0, 0, 0, 0.1);
    border-radius: 2px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, #667eea, #764ba2);
    border-radius: 2px;
    transition: width 0.3s ease;
    width: 0%;
}

#progress-text {
    font-size: 0.8rem;
    color: #666;
}

main {
    flex: 1;
    display: flex;
    flex-direction: column;
    padding: 1rem;
    gap: 1rem;
    overflow: hidden;
}

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

.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 0.5rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    scroll-behavior: smooth;
}

.message {
    display: flex;
    max-width: 85%;
    animation: fadeIn 0.3s ease-out;
}

.user-message {
    align-self: flex-end;
}

.assistant-message {
    align-self: flex-start;
}

.message-content {
    padding: 0.75rem 1rem;
    border-radius: 1rem;
    word-wrap: break-word;
    white-space: pre-wrap;
}

.user-message .message-content {
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    border-bottom-right-radius: 0.25rem;
}

.assistant-message .message-content {
    background: #f7fafc;
    color: #2d3748;
    border: 1px solid #e2e8f0;
    border-bottom-left-radius: 0.25rem;
}

.input-container {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.input-group {
    display: flex;
    gap: 0.5rem;
    align-items: flex-end;
}

#user-input {
    flex: 1;
    padding: 0.75rem 1rem;
    border: 2px solid #e2e8f0;
    border-radius: 1rem;
    font-family: inherit;
    font-size: 1rem;
    resize: none;
    outline: none;
    transition: border-color 0.2s ease;
    max-height: 120px;
    min-height: 48px;
}

#user-input:focus {
    border-color: #667eea;
}

#user-input:disabled {
    background: #f7fafc;
    color: #a0aec0;
    cursor: not-allowed;
}

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

#send-button:hover:not(:disabled) {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.4);
}

#send-button:disabled {
    background: #cbd5e0;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.controls {
    display: flex;
    gap: 0.5rem;
    justify-content: center;
}

.load-button, .clear-button {
    padding: 0.5rem 1rem;
    border: none;
    border-radius: 0.5rem;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.2s ease, transform 0.2s ease;
}

.load-button {
    background: linear-gradient(135deg, #48bb78, #38a169);
    color: white;
}

.load-button:hover:not(:disabled) {
    transform: translateY(-1px);
}

.load-button:disabled {
    background: #cbd5e0;
    color: #a0aec0;
    cursor: not-allowed;
    transform: none;
}

.clear-button {
    background: #fed7d7;
    color: #c53030;
}

.clear-button:hover:not(:disabled) {
    background: #feb2b2;
}

.clear-button:disabled {
    background: #f7fafc;
    color: #a0aec0;
    cursor: not-allowed;
}

.hidden {
    display: none !important;
}

.typing-indicator {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-style: italic;
    color: #666;
    animation: pulse 1.5s ease-in-out infinite;
}

.typing-dots {
    display: flex;
    gap: 0.25rem;
}

.typing-dots span {
    width: 0.5rem;
    height: 0.5rem;
    background: #cbd5e0;
    border-radius: 50%;
    animation: bounce 1.4s ease-in-out infinite both;
}

.typing-dots span:nth-child(1) { animation-delay: -0.32s; }
.typing-dots span:nth-child(2) { animation-delay: -0.16s; }

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

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

@keyframes bounce {
    0%, 80%, 100% {
        transform: scale(0);
    }
    40% {
        transform: scale(1);
    }
}

/* Mobile responsiveness */
@media (max-width: 768px) {
    .container {
        height: 100vh;
        margin: 0;
        border-radius: 0;
    }
    
    header {
        padding: 1rem;
        flex-direction: column;
        align-items: stretch;
        text-align: center;
    }
    
    .model-status {
        align-items: center;
    }
    
    main {
        padding: 0.5rem;
    }
    
    .message {
        max-width: 95%;
    }
    
    .progress-bar {
        width: 150px;
    }
}

/* Scrollbar styling */
.chat-messages::-webkit-scrollbar {
    width: 6px;
}

.chat-messages::-webkit-scrollbar-track {
    background: transparent;
}

.chat-messages::-webkit-scrollbar-thumb {
    background: #cbd5e0;
    border-radius: 3px;
}

.chat-messages::-webkit-scrollbar-thumb:hover {
    background: #a0aec0;
}