/* Custom CSS Variables - Langchain.com inspired */
:root {
    --primary-color: #1c3b3b;
    --secondary-color: #1d3d3c;
    --accent-color: #8b5cf6;
    --accent-light: #a78bfa;
    --text-primary: #1c3b3b;
    --text-light: #f8f7ff;
    --text-muted: #6b7280;
    --background-light: #f8f7ff;
    --background-dark: #0f1419;
    --card-background: rgba(255, 255, 255, 0.8);
    --border-color: rgba(28, 59, 59, 0.1);
    --gradient-primary: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    --gradient-accent: linear-gradient(135deg, var(--accent-color) 0%, var(--accent-light) 100%);
}

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

body {
    font-family: 'Manrope', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--background-light);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

/* Navigation */
.navbar {
    background: rgba(248, 247, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 0;
}

.navbar-brand {
    text-decoration: none;
    color: var(--text-primary) !important;
}

.logo-container {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.logo-icon {
    font-size: 1.5rem;
    color: var(--accent-color);
}

.brand-text {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.navbar-nav .nav-link {
    color: var(--text-primary) !important;
    font-weight: 500;
    padding: 0.5rem 1rem !important;
    border-radius: 0.5rem;
    transition: all 0.3s ease;
}

.navbar-nav .nav-link:hover {
    background: var(--card-background);
    color: var(--accent-light) !important;
}

.dropdown-menu {
    background: var(--card-background);
    border: 1px solid var(--border-color);
    border-radius: 0.75rem;
    padding: 0.5rem;
}

.dropdown-item {
    color: var(--text-primary);
    border-radius: 0.5rem;
    padding: 0.5rem 1rem;
    transition: all 0.3s ease;
}

.dropdown-item:hover {
    background: rgba(139, 92, 246, 0.1);
    color: var(--accent-color);
}

.btn-outline-light {
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
    font-weight: 600;
    padding: 0.5rem 1.5rem;
    border-radius: 2rem;
    transition: all 0.3s ease;
}

.btn-outline-light:hover {
    background: var(--primary-color);
    color: var(--text-light);
    border-color: var(--primary-color);
}

.btn-primary {
    background: var(--primary-color);
    border: none;
    color: var(--text-light);
    font-weight: 600;
    padding: 0.5rem 1.5rem;
    border-radius: 2rem;
    transition: all 0.3s ease;
}

.btn-primary:hover {
    background: var(--secondary-color);
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(28, 59, 59, 0.3);
}

/* Hero Section */
.hero-section {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    overflow: hidden;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--background-light);
    z-index: -2;
}

.hero-background::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1000 1000"><defs><linearGradient id="grad" x1="0%" y1="0%" x2="100%" y2="100%"><stop offset="0%" style="stop-color:%238b5cf6;stop-opacity:0.3" /><stop offset="100%" style="stop-color:%23a78bfa;stop-opacity:0.1" /></linearGradient></defs><path d="M0,300 Q250,100 500,300 T1000,300 L1000,0 L0,0 Z" fill="url(%23grad)"/></svg>') no-repeat center center;
    background-size: cover;
    z-index: -1;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: 1.5rem;
    letter-spacing: -0.02em;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-muted);
    margin-bottom: 2rem;
    line-height: 1.6;
}

.hero-buttons {
    margin-bottom: 2rem;
}

.hero-announcement {
    background: var(--card-background);
    border: 1px solid var(--border-color);
    border-radius: 0.75rem;
    padding: 1rem;
    font-size: 0.9rem;
    color: var(--text-muted);
}

.hero-announcement i {
    color: var(--accent-color);
    margin-right: 0.5rem;
}

.hero-announcement a {
    color: var(--accent-light);
    text-decoration: none;
}

.hero-image img {
    border-radius: 1rem;
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.3);
}

/* Trusted By Section */
.trusted-section {
    background: rgba(255, 255, 255, 0.02);
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

.trust-logo {
    color: var(--text-muted);
    transition: all 0.3s ease;
}

.trust-logo:hover {
    color: var(--accent-light);
    transform: translateY(-2px);
}

/* Features Section */
.features-section {
    padding: 5rem 0;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    letter-spacing: -0.02em;
}

.section-subtitle {
    font-size: 1.1rem;
    color: var(--text-muted);
    line-height: 1.6;
}

.feature-card {
    background: var(--card-background);
    border: 1px solid var(--border-color);
    border-radius: 1rem;
    padding: 2rem;
    height: 100%;
    transition: all 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
    border-color: var(--accent-color);
}

.feature-icon {
    width: 60px;
    height: 60px;
    background: var(--gradient-accent);
    border-radius: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
}

.feature-icon i {
    font-size: 1.5rem;
    color: var(--text-light);
}

.feature-card h4 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.feature-card p {
    color: var(--text-muted);
    line-height: 1.6;
}

/* Pricing Preview */
.pricing-preview {
    background: var(--card-background);
    border-radius: 2rem;
    margin: 2rem 0;
    border: 1px solid var(--border-color);
}

.pricing-hero {
    background: var(--background-light);
    padding-top: 8rem;
}

.pricing-card {
    background: var(--card-background);
    border: 1px solid var(--border-color);
    border-radius: 1rem;
    padding: 2rem;
    text-align: center;
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
}

.pricing-card.featured {
    border-color: var(--accent-color);
    background: linear-gradient(135deg, rgba(139, 92, 246, 0.1) 0%, rgba(167, 139, 250, 0.05) 100%);
    transform: scale(1.05);
}

.pricing-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 40px rgba(28, 59, 59, 0.1);
}

.pricing-header {
    margin-bottom: 2rem;
}

.pricing-badge {
    background: var(--gradient-accent);
    color: var(--text-light);
    padding: 0.25rem 0.75rem;
    border-radius: 1rem;
    font-size: 0.8rem;
    font-weight: 600;
    display: inline-block;
    margin-bottom: 1rem;
}

.pricing-badge.featured {
    background: var(--gradient-accent);
}

.pricing-price {
    font-size: 3rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.pricing-period {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.pricing-features {
    flex-grow: 1;
    text-align: left;
}

.feature-list {
    list-style: none;
    padding: 0;
}

.feature-list li {
    padding: 0.5rem 0;
    display: flex;
    align-items: center;
}

.feature-list i {
    color: var(--accent-color);
    margin-right: 0.75rem;
    width: 16px;
}

.pricing-footer {
    margin-top: 2rem;
}

/* Use Cases */
.use-cases {
    padding: 5rem 0;
}

.use-case-card {
    background: var(--card-background);
    border: 1px solid var(--border-color);
    border-radius: 1rem;
    padding: 2rem;
    height: 100%;
    transition: all 0.3s ease;
}

.use-case-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
}

.use-case-category {
    background: var(--gradient-accent);
    color: var(--text-light);
    padding: 0.25rem 0.75rem;
    border-radius: 1rem;
    font-size: 0.8rem;
    font-weight: 600;
    display: inline-block;
    margin-bottom: 1rem;
}

.use-case-stats {
    margin-top: 1rem;
}

.stat {
    background: rgba(139, 92, 246, 0.2);
    color: var(--accent-light);
    padding: 0.25rem 0.75rem;
    border-radius: 1rem;
    font-size: 0.8rem;
    font-weight: 600;
}

/* CTA Section */
.cta-section {
    background: var(--gradient-accent);
    border-radius: 2rem;
    margin: 2rem 0;
    text-align: center;
    color: var(--text-light);
}

.cta-section h2 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--text-light);
}

.cta-section .lead {
    font-size: 1.1rem;
    opacity: 0.9;
    color: var(--text-light);
}

/* Contact Form Styles */
.contact-hero {
    background: var(--background-light);
    padding-top: 8rem;
}

.contact-form-section {
    background: var(--background-light);
}

.contact-form-card {
    background: var(--card-background);
    border: 1px solid var(--border-color);
    border-radius: 1rem;
    padding: 3rem;
    box-shadow: 0 10px 30px rgba(28, 59, 59, 0.1);
}

.form-label {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.form-control, .form-select {
    border: 2px solid var(--border-color);
    border-radius: 0.5rem;
    padding: 0.75rem 1rem;
    font-size: 1rem;
    transition: all 0.3s ease;
}

.form-control:focus, .form-select:focus {
    border-color: var(--accent-color);
    box-shadow: 0 0 0 0.2rem rgba(139, 92, 246, 0.25);
}

.success-message {
    text-align: center;
    padding: 3rem;
}

.success-icon {
    font-size: 4rem;
    color: #10b981;
    margin-bottom: 1.5rem;
}

.next-steps {
    text-align: left;
    max-width: 400px;
    margin: 0 auto;
}

.contact-info-section {
    background: var(--background-light);
}

.contact-info-card {
    background: var(--card-background);
    border: 1px solid var(--border-color);
    border-radius: 1rem;
    padding: 2rem;
    text-align: center;
    height: 100%;
    transition: all 0.3s ease;
}

.contact-info-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 40px rgba(28, 59, 59, 0.1);
}

.contact-icon {
    width: 60px;
    height: 60px;
    background: var(--gradient-accent);
    border-radius: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
}

.contact-icon i {
    font-size: 1.5rem;
    color: var(--text-light);
}

/* FAQ Styles */
.faq-section {
    background: var(--background-light);
}

.accordion-item {
    background: var(--card-background);
    border: 1px solid var(--border-color);
    margin-bottom: 1rem;
    border-radius: 0.5rem;
}

.accordion-button {
    background: transparent;
    color: var(--text-primary);
    font-weight: 600;
    border: none;
    padding: 1.5rem;
}

.accordion-button:not(.collapsed) {
    background: rgba(139, 92, 246, 0.1);
    color: var(--accent-color);
}

.accordion-body {
    color: var(--text-muted);
    line-height: 1.6;
}

/* Footer */
.footer {
    background: var(--primary-color);
    border-top: 1px solid var(--border-color);
    margin-top: 3rem;
    color: var(--text-light);
}

.footer-brand {
    margin-bottom: 2rem;
}

.footer h5 {
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-light);
}

.footer .brand-text {
    color: var(--text-light);
}

.footer-links {
    list-style: none;
    padding: 0;
}

.footer-links li {
    margin-bottom: 0.5rem;
}

.footer-links a {
    color: rgba(248, 247, 255, 0.7);
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-links a:hover {
    color: var(--text-light);
}

.contact-info p {
    margin-bottom: 0.5rem;
    color: rgba(248, 247, 255, 0.7);
}

.contact-info i {
    color: var(--accent-color);
    margin-right: 0.5rem;
    width: 16px;
}

.footer-status {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 0.5rem;
    color: var(--text-muted);
}

.status-indicator {
    width: 8px;
    height: 8px;
    background: #10b981;
    border-radius: 50%;
    animation: pulse 2s infinite;
}

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

/* Responsive Design */
@media (max-width: 768px) {
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-subtitle {
        font-size: 1.1rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .navbar-nav {
        background: var(--secondary-color);
        border-radius: 1rem;
        padding: 1rem;
        margin-top: 1rem;
    }
    
    .hero-buttons .btn {
        display: block;
        width: 100%;
        margin-bottom: 1rem;
    }
    
    .cta-buttons .btn {
        display: block;
        width: 100%;
        margin-bottom: 1rem;
    }
}

/* Smooth Scrolling */
html {
    scroll-behavior: smooth;
}

/* Additional styles for better langchain.com replication */
.btn-outline-primary {
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
    font-weight: 600;
    padding: 0.5rem 1.5rem;
    border-radius: 2rem;
    transition: all 0.3s ease;
}

.btn-outline-primary:hover {
    background: var(--primary-color);
    color: var(--text-light);
    border-color: var(--primary-color);
}

.navbar.scrolled {
    background: rgba(248, 247, 255, 0.98);
    box-shadow: 0 2px 20px rgba(28, 59, 59, 0.1);
}

.pricing-section {
    background: var(--background-light);
}

.invalid-feedback {
    display: block;
    color: #dc3545;
    font-size: 0.875rem;
    margin-top: 0.25rem;
}

.form-control.is-invalid, .form-select.is-invalid {
    border-color: #dc3545;
}

.form-control.is-invalid:focus, .form-select.is-invalid:focus {
    border-color: #dc3545;
    box-shadow: 0 0 0 0.2rem rgba(220, 53, 69, 0.25);
}

/* Loading Animation */
.loading {
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.6s ease;
}

.loading.loaded {
    opacity: 1;
    transform: translateY(0);
}