:root {
    --primary: #0066ff;
    --primary-dark: #0052cc;
    --accent: #00d4aa;
    --background: #000000;
    --surface: #111111;
    --surface-elevated: #1a1a1a;
    --text: #ffffff;
    --text-secondary: #a0a0a0;
    --text-muted: #666666;
    --border: rgba(255, 255, 255, 0.08);
    --border-focus: rgba(0, 102, 255, 0.3);
    --shadow: rgba(0, 0, 0, 0.4);
    --success: #00d4aa;
    --warning: #ffa726;
    --error: #f44336;
}

[data-theme="light"] {
    --background: #ffffff;
    --surface: #f8f9fa;
    --surface-elevated: #ffffff;
    --text: #1a1a1a;
    --text-secondary: #4a5568;
    --text-muted: #718096;
    --border: rgba(0, 0, 0, 0.08);
    --border-focus: rgba(0, 102, 255, 0.3);
    --shadow: rgba(0, 0, 0, 0.1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', system-ui, sans-serif;
    background: var(--background);
    color: var(--text);
    line-height: 1.5;
    min-height: 100vh;
    font-weight: 400;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 2rem 1.5rem;
}

.header {
    text-align: center;
    margin-bottom: 2.5rem;
}
.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 100%;
}
.header-text {
    flex: 1;
    text-align: center;
}
.header-controls {
    display: flex;
    align-items: center;
    gap: 1rem;
}

/* LLM Toggle Switch Styles */
.llm-toggle {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}
.toggle-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.switch {
    position: relative;
    display: inline-block;
    width: 80px;
    height: 32px;
}

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

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--surface);
    border: 1px solid var(--border);
    transition: .4s;
    overflow: hidden;
}

.slider:before {
    position: absolute;
    content: "";
    height: 24px;
    width: 24px;
    left: 3px;
    bottom: 3px;
    background-color: var(--primary);
    transition: .4s;
    border-radius: 50%;
    z-index: 2;
}

.slider-text-off, .slider-text-on {
    position: absolute;
    color: var(--text-secondary);
    font-size: 0.7rem;
    font-weight: 500;
    top: 50%;
    transform: translateY(-50%);
    transition: .4s;
    pointer-events: none;
    z-index: 1;
}

.slider-text-off {
    left: 8px;
}

.slider-text-on {
    right: 8px;
    opacity: 0;
}

input:checked + .slider {
    background-color: var(--accent);
    border-color: var(--accent);
}

input:checked + .slider .slider-text-off {
    opacity: 0;
}

input:checked + .slider .slider-text-on {
    opacity: 1;
}

input:checked + .slider:before {
    transform: translateX(48px);
}

.slider.round {
    border-radius: 20px;
}

.slider.round:before {
    border-radius: 50%;
}

.theme-toggle {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 0.75rem;
    color: var(--text);
    cursor: pointer;
    transition: all 0.2s ease;
    font-size: 1.1rem;
    min-width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
}
.theme-toggle:hover {
    background: var(--surface-elevated);
    border-color: var(--primary);
    transform: translateY(-1px);
}

.header h1 {
    font-size: 2.25rem;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 0.5rem;
    letter-spacing: -0.025em;
}

.header .brand {
    color: var(--primary);
}

.header p {
    color: var(--text-secondary);
    font-size: 1rem;
    font-weight: 400;
}

.status {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 1rem 1.5rem;
    margin-bottom: 2rem;
    text-align: center;
    transition: all 0.2s ease;
}

.status.online {
    border-color: var(--success);
    background: linear-gradient(135deg, rgba(0, 212, 170, 0.05), rgba(0, 212, 170, 0.02));
}

.status.offline {
    border-color: var(--error);
    background: linear-gradient(135deg, rgba(244, 67, 54, 0.05), rgba(244, 67, 54, 0.02));
}

.status.checking {
    border-color: var(--warning);
    background: linear-gradient(135deg, rgba(255, 167, 38, 0.05), rgba(255, 167, 38, 0.02));
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.8; }
}

.chat-interface {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 16px;
    overflow: hidden;
    margin-bottom: 2rem;
    backdrop-filter: blur(20px);
}

.chat-messages {
    height: 480px;
    overflow-y: auto;
    padding: 2rem;
    background: linear-gradient(180deg, var(--background), var(--surface));
}

.chat-messages::-webkit-scrollbar {
    width: 3px;
}

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

.chat-messages::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 2px;
}

.message {
    margin-bottom: 2rem;
    opacity: 0;
    animation: messageSlide 0.4s cubic-bezier(0.2, 0, 0.2, 1) forwards;
}

@keyframes messageSlide {
    from { 
        opacity: 0; 
        transform: translateY(20px) scale(0.98); 
    }
    to { 
        opacity: 1; 
        transform: translateY(0) scale(1); 
    }
}

.message.user {
    text-align: right;
}

.message.assistant {
    text-align: left;
}

.message-content {
    display: inline-block;
    max-width: 75%;
    padding: 1.25rem 1.5rem;
    border-radius: 24px;
    font-size: 0.95rem;
    line-height: 1.6;
    position: relative;
}

.message.user .message-content {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: #ffffff;
    border-bottom-right-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 102, 255, 0.2);
}

.message.assistant .message-content {
    background: var(--surface-elevated);
    color: var(--text);
    border-bottom-left-radius: 8px;
    border: 1px solid var(--border);
}
.message-content h1, .message-content h2, .message-content h3, .message-content h4 {
    color: var(--accent);
    margin: 1.25rem 0 0.5rem 0;
    font-weight: 600;
    line-height: 1.3;
    text-shadow: 0 1px 2px rgba(0, 212, 170, 0.1);
}
.message-content h1 { 
    font-size: 1.35rem; 
    background: linear-gradient(135deg, var(--accent), #00b894);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.message-content h2 { 
    font-size: 1.2rem;
    color: #00b894;
}
.message-content h3 { 
    font-size: 1.05rem;
    color: var(--accent);
}
.message-content h4 { 
    font-size: 0.95rem;
    color: #74b9ff;
}
.message-content p {
    margin: 0.75rem 0;
    line-height: 1.65;
    color: var(--text);
}
.message-content ul, .message-content ol {
    margin: 0.75rem 0;
    padding-left: 1.5rem;
    line-height: 1.6;
}
.message-content li {
    margin: 0.3rem 0;
    line-height: 1.6;
    position: relative;
}
.message-content ul li::marker {
    color: var(--accent);
}
.message-content ol li::marker {
    color: var(--accent);
    font-weight: 600;
}
.message-content table {
    width: 100%;
    border-collapse: collapse;
    margin: 1rem 0;
    font-size: 0.9rem;
}
.message-content th, .message-content td {
    border: 1px solid var(--border);
    padding: 0.5rem 0.75rem;
    text-align: left;
}
.message-content th {
    background: var(--surface);
    font-weight: 600;
    color: var(--accent);
}
.message-content strong {
    background: linear-gradient(135deg, var(--accent), #74b9ff);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: 700;
    text-shadow: 0 1px 2px rgba(0, 212, 170, 0.2);
}
.message-content em {
    color: #a29bfe;
    font-style: italic;
    background: rgba(162, 155, 254, 0.1);
    padding: 0.1rem 0.2rem;
    border-radius: 3px;
}
.message-content code {
    background: linear-gradient(135deg, rgba(116, 185, 255, 0.15), rgba(0, 212, 170, 0.1));
    border: 1px solid rgba(116, 185, 255, 0.3);
    padding: 0.2rem 0.5rem;
    border-radius: 6px;
    font-family: 'SF Mono', Consolas, 'Courier New', monospace;
    font-size: 0.85rem;
    color: #74b9ff;
    font-weight: 600;
    text-shadow: 0 1px 2px rgba(116, 185, 255, 0.2);
}
.message.user .message-content strong,
.message.user .message-content code,
.message.user .message-content em {
    color: rgba(255, 255, 255, 0.95);
    background: rgba(255, 255, 255, 0.1);
    -webkit-text-fill-color: rgba(255, 255, 255, 0.95);
}
.message-content pre {
    background: var(--background);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1rem;
    margin: 1rem 0;
    overflow-x: auto;
    font-family: 'SF Mono', Consolas, 'Courier New', monospace;
    font-size: 0.85rem;
    line-height: 1.5;
}
.message-content pre code {
    background: none;
    border: none;
    padding: 0;
    font-size: inherit;
}
.message-content blockquote {
    border-left: 3px solid var(--accent);
    padding-left: 1rem;
    margin: 1rem 0;
    color: var(--text-secondary);
    font-style: italic;
    background: rgba(0, 212, 170, 0.05);
    padding: 0.75rem 0 0.75rem 1rem;
    border-radius: 0 4px 4px 0;
}
.message-content a {
    color: var(--accent);
    text-decoration: none;
    border-bottom: 1px solid transparent;
    transition: border-color 0.2s ease;
}
.message-content a:hover {
    border-bottom-color: var(--accent);
}
.message.user .message-content {
    word-wrap: break-word;
    white-space: pre-wrap;
}
.message.user .message-content strong,
.message.user .message-content code {
    color: rgba(255, 255, 255, 0.9);
}

.message-meta {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: 0.5rem;
    font-weight: 500;
}

.sources {
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border);
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.sources span {
    display: inline-block;
    background: rgba(0, 102, 255, 0.1);
    border: 1px solid rgba(0, 102, 255, 0.2);
    padding: 0.25rem 0.75rem;
    border-radius: 6px;
    margin: 0.25rem 0.5rem 0.25rem 0;
    font-weight: 500;
    font-size: 0.75rem;
}

.input-area {
    padding: 2rem;
    background: linear-gradient(180deg, var(--surface), var(--surface-elevated));
    border-top: 1px solid var(--border);
}

.input-container {
    display: flex;
    gap: 1rem;
    align-items: stretch;
}

.input-field {
    flex: 1;
    padding: 1rem 1.5rem;
    background: var(--background);
    border: 2px solid var(--border);
    border-radius: 28px;
    color: var(--text);
    font-size: 0.95rem;
    outline: none;
    transition: all 0.2s cubic-bezier(0.2, 0, 0.2, 1);
    font-weight: 400;
}

.input-field:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 4px var(--border-focus);
    background: var(--surface);
}

.input-field::placeholder {
    color: var(--text-muted);
    font-weight: 400;
}

.send-button {
    padding: 1rem 2rem;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: #ffffff;
    border: none;
    border-radius: 28px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.2, 0, 0.2, 1);
    font-size: 0.95rem;
    box-shadow: 0 4px 12px rgba(0, 102, 255, 0.2);
}

.send-button:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(0, 102, 255, 0.3);
}

.send-button:active {
    transform: translateY(0);
}

.send-button:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
    box-shadow: 0 4px 12px rgba(0, 102, 255, 0.1);
}

.examples {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1rem;
    margin-top: 1rem;
}

.example {
    background: linear-gradient(135deg, var(--surface), var(--surface-elevated));
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 1.5rem;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.2, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.example::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(0, 102, 255, 0.05), transparent);
    transition: left 0.5s ease;
}

.example:hover::before {
    left: 100%;
}

.example:hover {
    border-color: var(--primary);
    transform: translateY(-4px);
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.2);
    background: linear-gradient(135deg, var(--surface-elevated), var(--surface));
}

.example-title {
    font-weight: 600;
    color: var(--text);
    margin-bottom: 0.5rem;
    font-size: 0.95rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}
.example-title i {
    color: var(--primary);
    font-size: 1rem;
    width: 20px;
    text-align: center;
}

.example-desc {
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-weight: 400;
}

.loading {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.loading::after {
    content: '';
    width: 14px;
    height: 14px;
    border: 2px solid currentColor;
    border-top-color: transparent;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}
.loading-indicator {
    display: none;
    background: var(--surface-elevated);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 1.5rem;
    margin: 1rem 0;
    text-align: center;
    color: var(--text-secondary);
}
.loading-indicator.active {
    display: block;
}
.loading-spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 2px solid var(--border);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-right: 0.5rem;
}
.progress-container {
    width: 100%;
    height: 4px;
    background: var(--border);
    border-radius: 2px;
    overflow: hidden;
    margin: 10px 0 0 0;
}
.progress-bar {
    height: 100%;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    border-radius: 2px;
    transition: width 0.3s ease;
    width: 0%;
}
.status-indicator {
    position: fixed;
    top: 20px;
    right: 20px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 0.75rem 1rem;
    font-size: 0.85rem;
    color: var(--text-secondary);
    opacity: 0;
    transform: translateY(-10px);
    transition: all 0.3s ease;
    z-index: 1000;
}
.status-indicator.show {
    opacity: 1;
    transform: translateY(0);
}
.status-indicator.processing {
    border-color: var(--primary);
    background: linear-gradient(135deg, rgba(0, 102, 255, 0.05), rgba(0, 102, 255, 0.02));
}

.visualization-container {
    margin: 1.5rem 0;
    background: var(--surface-elevated);
    border-radius: 12px;
    padding: 1.5rem;
    border: 1px solid var(--border);
}

.welcome {
    text-align: center;
    padding: 4rem 2rem;
    color: var(--text-secondary);
}

.welcome h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text);
}

.welcome p {
    font-size: 0.95rem;
    font-weight: 400;
}

@media (max-width: 768px) {
    .container {
        padding: 1rem;
    }
    
    .header-content {
        flex-direction: column;
        gap: 1rem;
    }
    
    .header-text {
        text-align: center;
    }
    
    .header h1 {
        font-size: 1.75rem;
    }
    
    .chat-messages {
        height: 400px;
        padding: 1.5rem;
    }
    
    .message-content {
        max-width: 85%;
        padding: 1rem 1.25rem;
    }
    
    .input-area {
        padding: 1.5rem;
    }
    
    .input-container {
        flex-direction: column;
        gap: 0.75rem;
    }
    
    .send-button {
        align-self: stretch;
    }
    
    .examples {
        grid-template-columns: 1fr;
    }
}