* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
:root {
    --bg-primary: #0a0a0a;
    --bg-secondary: #141414;
    --bg-tertiary: #1a1a1a;
    --text-primary: #ffffff;
    --text-secondary: #a0a0a0;
    --accent: #3b82f6;
    --accent-hover: #2563eb;
    --border: #2a2a2a;
    --success: #10b981;
    --gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}
body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}
/* Navigation */
.nav {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(10, 10, 10, 0.8);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    z-index: 1000;
}
.nav-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-weight: 600;
    font-size: 1.125rem;
}
.logo svg {
    color: var(--accent);
}
.nav-links {
    display: flex;
    align-items: center;
    gap: 2rem;
}
.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.2s;
}
.nav-links a:hover {
    color: var(--text-primary);
}
/* Buttons */
.btn-primary, .btn-secondary, .btn-large {
    padding: 0.625rem 1.5rem;
    border-radius: 8px;
    border: none;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    font-size: 0.9375rem;
}
.btn-primary {
    background: var(--accent);
    color: white;
}
.btn-primary:hover {
    background: var(--accent-hover);
    transform: translateY(-1px);
}
.btn-secondary {
    background: transparent;
    color: var(--text-primary);
    border: 1px solid var(--border);
}
.btn-secondary:hover {
    border-color: var(--accent);
}
.btn-large {
    padding: 0.875rem 2rem;
    font-size: 1rem;
}
/* Hero Section */
.hero {
    padding: 8rem 2rem 4rem;
    text-align: center;
    background: radial-gradient(ellipse at top, rgba(59, 130, 246, 0.1), transparent 50%);
}
.hero-content {
    max-width: 900px;
    margin: 0 auto;
}
.hero h1 {
    font-size: 4rem;
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: 1.5rem;
    background: linear-gradient(135deg, #fff 0%, #a0a0a0 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 2.5rem;
    line-height: 1.8;
}
.hero-cta {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin-bottom: 4rem;
}
.stats {
    display: flex;
    gap: 4rem;
    justify-content: center;
    padding: 2rem 0;
}
.stat {
    text-align: center;
}
.stat-number {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--accent);
    margin-bottom: 0.5rem;
}
.stat-label {
    color: var(--text-secondary);
    font-size: 0.875rem;
}
/* Models Showcase */
.models-showcase {
    padding: 3rem 2rem;
    text-align: center;
}
.models-showcase h2 {
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: 2rem;
}
.models-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    justify-content: center;
    max-width: 900px;
    margin: 0 auto;
}
.model-badge {
    padding: 0.625rem 1.25rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 24px;
    font-size: 0.875rem;
    color: var(--text-secondary);
}
/* Features */
.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    max-width: 1200px;
    margin: 4rem auto;
    padding: 0 2rem;
}
.feature-card {
    padding: 2rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 12px;
    transition: all 0.3s;
}
.feature-card:hover {
    border-color: var(--accent);
    transform: translateY(-4px);
}
.feature-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}
.feature-card h3 {
    font-size: 1.25rem;
    margin-bottom: 0.75rem;
}
.feature-card p {
    color: var(--text-secondary);
    line-height: 1.6;
}
/* Chat Section */
.chat-section {
    max-width: 900px;
    margin: 6rem auto;
    padding: 0 2rem;
}
.chat-container {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 16px;
    overflow: hidden;
}
.chat-header {
    padding: 1.5rem 2rem;
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.chat-header h2 {
    font-size: 1.5rem;
}
.model-status {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    color: var(--text-secondary);
}
.status-dot {
    width: 8px;
    height: 8px;
    background: var(--success);
    border-radius: 50%;
    animation: pulse 2s infinite;
}
@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}
.chat-messages {
    height: 500px;
    overflow-y: auto;
    padding: 2rem;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}
.message-assistant, .message-user {
    display: flex;
    gap: 1rem;
    max-width: 85%;
}
.message-user {
    align-self: flex-end;
    flex-direction: row-reverse;
}
.message-avatar {
    width: 40px;
    height: 40px;
    border-radius: 8px;
    background: var(--accent);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    flex-shrink: 0;
}
.message-content {
    background: var(--bg-tertiary);
    padding: 1rem 1.25rem;
    border-radius: 12px;
    line-height: 1.6;
}
.message-user .message-content {
    background: var(--accent);
}
.synthesis {
    padding: 1rem;
    background: rgba(59, 130, 246, 0.1);
    border-left: 3px solid var(--accent);
    border-radius: 8px;
    margin-bottom: 1rem;
}
.synthesis h3 {
    margin-bottom: 0.75rem;
    color: var(--accent);
}
.message-content a {
    color: var(--accent);
    text-decoration: underline;
}
.message-content ul {
    margin: 0.5rem 0;
    padding-left: 1.5rem;
}
.model-responses {
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border);
}
.model-response {
    margin-top: 0.75rem;
    padding: 0.75rem;
    background: rgba(59, 130, 246, 0.05);
    border-radius: 8px;
    font-size: 0.875rem;
}
.model-response strong {
    color: var(--accent);
}
.chat-input-container {
    padding: 1.5rem 2rem;
    border-top: 1px solid var(--border);
    display: flex;
    gap: 1rem;
}
#chatInput {
    flex: 1;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 1rem;
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.9375rem;
    resize: none;
    outline: none;
    transition: border-color 0.2s;
}
#chatInput:focus {
    border-color: var(--accent);
}
#sendButton {
    padding: 1rem;
    background: var(--accent);
    border: none;
    border-radius: 12px;
    color: white;
    cursor: pointer;
    transition: all 0.2s;
}
#sendButton:hover {
    background: var(--accent-hover);
    transform: translateY(-1px);
}
#sendButton:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}
.processing-status {
    padding: 1rem 2rem;
    border-top: 1px solid var(--border);
    background: rgba(59, 130, 246, 0.05);
}
.processing-models {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}
.processing-model {
    padding: 0.375rem 0.75rem;
    background: var(--bg-tertiary);
    border-radius: 12px;
    font-size: 0.75rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}
.spinner {
    width: 12px;
    height: 12px;
    border: 2px solid var(--border);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}
@keyframes spin {
    to { transform: rotate(360deg); }
}
/* Pricing */
.pricing {
    max-width: 1200px;
    margin: 6rem auto;
    padding: 0 2rem;
    text-align: center;
}
.pricing h2 {
    font-size: 2.5rem;
    margin-bottom: 3rem;
}
.pricing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}
.pricing-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 2.5rem;
    text-align: left;
    position: relative;
    transition: all 0.3s;
}
.pricing-card:hover {
    border-color: var(--accent);
    transform: translateY(-4px);
}
.pricing-card.featured {
    border-color: var(--accent);
}
.badge {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--accent);
    padding: 0.375rem 1rem;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 600;
}
.pricing-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
}
.price {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 2rem;
}
.price span {
    font-size: 1rem;
    color: var(--text-secondary);
    font-weight: 400;
}
.pricing-card ul {
    list-style: none;
    margin-bottom: 2rem;
}
.pricing-card li {
    padding: 0.75rem 0;
    color: var(--text-secondary);
}
.pricing-card .btn-primary {
    width: 100%;
}
/* Footer */
.footer {
    border-top: 1px solid var(--border);
    padding: 4rem 2rem 2rem;
    margin-top: 8rem;
}
.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 3rem;
    margin-bottom: 3rem;
}
.footer-section h4 {
    margin-bottom: 1rem;
}
.footer-section a {
    display: block;
    color: var(--text-secondary);
    text-decoration: none;
    padding: 0.375rem 0;
    transition: color 0.2s;
}
.footer-section a:hover {
    color: var(--text-primary);
}
.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid var(--border);
    color: var(--text-secondary);
    font-size: 0.875rem;
}
/* Responsive */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 2.5rem;
    }
   
    .hero-cta {
        flex-direction: column;
    }
   
    .stats {
        flex-direction: column;
        gap: 2rem;
    }
   
    .nav-links {
        gap: 1rem;
    }
}