/* =============================================================================
   AI BRAIN - Landing Page Styles
   Purple/Blue Theme with Animations
   ============================================================================= */

:root {
    --primary-purple: #667eea;
    --primary-purple-dark: #764ba2;
    --primary-purple-light: #f093fb;
    --primary-blue: #00bfff;
    --bg-dark: #0a0a0f;
    --bg-darker: #050508;
    --bg-card: rgba(20, 20, 30, 0.8);
    --text-primary: #ffffff;
    --text-secondary: #a0a0c0;
    --text-muted: #606080;
    --border-color: rgba(102, 126, 234, 0.2);
    --shadow-purple: rgba(138, 43, 226, 0.3);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: var(--bg-dark);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-50px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

@keyframes glow {
    0%, 100% { filter: brightness(1) drop-shadow(0 0 20px var(--shadow-purple)); }
    50% { filter: brightness(1.3) drop-shadow(0 0 40px var(--shadow-purple)); }
}

.fade-in {
    animation: fadeIn 1s ease forwards;
    opacity: 0;
}

.fade-in-up {
    animation: fadeInUp 1s ease forwards;
    opacity: 0;
}

.delay-1 { animation-delay: 0.2s; }
.delay-2 { animation-delay: 0.4s; }
.delay-3 { animation-delay: 0.6s; }
.delay-4 { animation-delay: 0.8s; }
.delay-5 { animation-delay: 1s; }
.delay-6 { animation-delay: 1.2s; }
.delay-7 { animation-delay: 1.4s; }

/* Navbar */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(10, 10, 15, 0.9);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

.navbar.scrolled {
    background: rgba(10, 10, 15, 0.95);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.25rem;
    font-weight: 700;
}

.logo-icon {
    font-size: 1.5rem;
}

.logo-text {
    background: linear-gradient(135deg, var(--primary-purple), var(--primary-purple-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-links {
    display: flex;
    gap: 2rem;
    align-items: center;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
}

.nav-links a:hover {
    color: var(--text-primary);
}

.btn-nav {
    padding: 0.5rem 1.5rem;
    background: linear-gradient(135deg, var(--primary-purple), var(--primary-purple-dark));
    border-radius: 0.5rem;
    color: var(--text-primary) !important;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.btn-nav:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px var(--shadow-purple);
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    padding: 6rem 2rem 4rem;
}

#particles-canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 900px;
    margin: 0 auto;
}

.hero-badge {
    display: inline-block;
    padding: 0.5rem 1.5rem;
    background: rgba(102, 126, 234, 0.1);
    border: 1px solid var(--border-color);
    border-radius: 2rem;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--primary-purple-light);
    margin-bottom: 2rem;
}

.hero-title {
    font-size: 5rem;
    font-weight: 900;
    background: linear-gradient(135deg, var(--primary-purple) 0%, var(--primary-purple-dark) 50%, var(--primary-purple-light) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: 4px;
    margin-bottom: 1.5rem;
    animation: glow 3s ease-in-out infinite;
}

.hero-subtitle {
    font-size: 1.75rem;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    font-weight: 300;
    letter-spacing: 1px;
}

.hero-description {
    font-size: 1.125rem;
    color: var(--text-secondary);
    max-width: 700px;
    margin: 0 auto 3rem;
    line-height: 1.8;
}

.hero-cta {
    display: flex;
    gap: 1.5rem;
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 1rem 2rem;
    border-radius: 0.75rem;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-purple), var(--primary-purple-dark));
    color: var(--text-primary);
    box-shadow: 0 4px 20px var(--shadow-purple);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 30px var(--shadow-purple);
}

.btn-secondary {
    background: transparent;
    border: 2px solid var(--border-color);
    color: var(--text-primary);
}

.btn-secondary:hover {
    background: rgba(102, 126, 234, 0.1);
    border-color: var(--primary-purple);
}

.btn-large {
    padding: 1.25rem 2.5rem;
    font-size: 1.125rem;
}

/* Floating Stats */
.floating-stats {
    position: relative;
    z-index: 1;
    display: flex;
    gap: 2rem;
    justify-content: center;
    margin-top: 4rem;
    flex-wrap: wrap;
}

.stat-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 1rem;
    padding: 2rem;
    text-align: center;
    backdrop-filter: blur(10px);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.stat-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 30px var(--shadow-purple);
}

.stat-value {
    font-size: 3rem;
    font-weight: 900;
    background: linear-gradient(135deg, var(--primary-purple), var(--primary-purple-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 0.5rem;
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* Features Section */
.features {
    padding: 8rem 2rem;
    background: linear-gradient(180deg, var(--bg-dark) 0%, var(--bg-darker) 100%);
}

.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.section-badge {
    display: inline-block;
    padding: 0.5rem 1.5rem;
    background: rgba(102, 126, 234, 0.1);
    border: 1px solid var(--border-color);
    border-radius: 2rem;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--primary-purple-light);
    margin-bottom: 1rem;
}

.section-title {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: 1rem;
}

.section-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

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

.feature-card:hover {
    transform: translateY(-5px);
    border-color: var(--primary-purple);
    box-shadow: 0 8px 30px var(--shadow-purple);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.feature-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, var(--primary-purple), var(--primary-purple-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.feature-card p {
    color: var(--text-secondary);
    line-height: 1.8;
}

/* How It Works */
.how-it-works {
    padding: 8rem 2rem;
    background: var(--bg-darker);
}

.layers-diagram {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.layer {
    display: flex;
    gap: 2rem;
    align-items: flex-start;
    padding: 2rem;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 1rem;
    transition: all 0.3s ease;
}

.layer:hover {
    border-color: var(--primary-purple);
    box-shadow: 0 4px 20px var(--shadow-purple);
}

.layer-number {
    font-size: 2.5rem;
    font-weight: 900;
    background: linear-gradient(135deg, var(--primary-purple), var(--primary-purple-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    min-width: 60px;
}

.layer-content h3 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.layer-content p {
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.layer-tech {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background: rgba(102, 126, 234, 0.1);
    border-radius: 0.5rem;
    font-size: 0.75rem;
    color: var(--primary-purple-light);
}

/* Demo Section */
.demo {
    padding: 8rem 2rem;
    background: linear-gradient(180deg, var(--bg-darker) 0%, var(--bg-dark) 100%);
}

.demo-container {
    max-width: 900px;
    margin: 0 auto 3rem;
}

.demo-chat {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 1rem;
    overflow: hidden;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

.demo-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.5rem;
    background: rgba(0, 0, 0, 0.2);
    border-bottom: 1px solid var(--border-color);
}

.demo-controls {
    display: flex;
    gap: 0.5rem;
}

.dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.dot.red { background: #ff5f56; }
.dot.yellow { background: #ffbd2e; }
.dot.green { background: #27c93f; }

.demo-messages {
    height: 400px;
    padding: 2rem;
    overflow-y: auto;
}

.demo-message {
    display: flex;
    gap: 1rem;
    margin-bottom: 1.5rem;
    animation: fadeInUp 0.5s ease;
}

.demo-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    flex-shrink: 0;
}

.demo-message.user .demo-avatar {
    background: linear-gradient(135deg, var(--primary-purple), var(--primary-purple-dark));
}

.demo-message.assistant .demo-avatar {
    background: linear-gradient(135deg, var(--primary-blue), var(--primary-purple));
}

.demo-text {
    flex: 1;
    padding: 1rem;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 1rem;
}

.demo-input {
    display: flex;
    gap: 1rem;
    padding: 1.5rem;
    border-top: 1px solid var(--border-color);
}

.demo-input input {
    flex: 1;
    padding: 1rem;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    border-radius: 0.75rem;
    color: var(--text-primary);
}

.demo-input button {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-purple), var(--primary-purple-dark));
    border: none;
    color: var(--text-primary);
    font-size: 1.5rem;
}

.demo-cta {
    text-align: center;
}

.demo-cta p {
    font-size: 1.25rem;
    margin-bottom: 1.5rem;
    color: var(--text-secondary);
}

/* CTA Section */
.cta-section {
    padding: 8rem 2rem;
    background: linear-gradient(135deg, var(--primary-purple), var(--primary-purple-dark));
    text-align: center;
}

.cta-content h2 {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.cta-content p {
    font-size: 1.25rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

/* Footer */
.footer {
    padding: 4rem 2rem 2rem;
    background: var(--bg-darker);
    border-top: 1px solid var(--border-color);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    margin-bottom: 3rem;
    flex-wrap: wrap;
    gap: 3rem;
}

.footer-brand {
    max-width: 300px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.footer-links {
    display: flex;
    gap: 4rem;
}

.footer-column h4 {
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.footer-column a {
    display: block;
    color: var(--text-secondary);
    text-decoration: none;
    margin-bottom: 0.5rem;
    transition: color 0.3s ease;
}

.footer-column a:hover {
    color: var(--primary-purple-light);
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
    color: var(--text-muted);
}

/* Responsive */
@media (max-width: 768px) {
    .hero-title {
        font-size: 3rem;
    }

    .section-title {
        font-size: 2rem;
    }

    .nav-links {
        display: none;
    }

    .features-grid {
        grid-template-columns: 1fr;
    }

    .layer {
        flex-direction: column;
    }
}
/* Use Cases Section */
.use-cases {
    padding: 8rem 2rem;
    background: var(--bg-dark);
}

.use-cases-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
    max-width: 1400px;
    margin: 0 auto;
}

.use-case-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 1rem;
    padding: 1.5rem;
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
}

.use-case-card:hover {
    transform: translateY(-5px);
    border-color: var(--primary-purple);
    box-shadow: 0 8px 30px var(--shadow-purple);
}

.use-case-icon {
    display: none; /* Hide emoji icons */
}

.use-case-card h3 {
    font-size: 1.25rem;
    margin-bottom: 0.75rem;
    background: linear-gradient(135deg, var(--primary-purple), var(--primary-purple-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.use-case-card p {
    color: var(--text-secondary);
    line-height: 1.6;
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

.use-case-benefits {
    list-style: none;
    padding: 0;
    margin: 0;
}

.use-case-benefits li {
    color: var(--text-secondary);
    font-size: 0.85rem;
    padding: 0.4rem 0;
    padding-left: 1.5rem;
    position: relative;
}

.use-case-benefits li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--primary-purple);
    font-weight: bold;
}

/* Responsive */
@media (max-width: 1200px) {
    .use-cases-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .use-cases-grid {
        grid-template-columns: 1fr;
    }
}

/* Particles canvas - fullscreen */
#particles-canvas {
    position: fixed !important;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    pointer-events: none;
}

/* Ensure all sections have proper z-index */
section {
    position: relative;
    z-index: 1;
}

/* Comparison Section */
.comparison {
    padding: 8rem 2rem;
    background: var(--bg-darker);
}

.comparison-table {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    max-width: 1000px;
    margin: 0 auto;
}

.comparison-column {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 1rem;
    overflow: hidden;
}

.comparison-column.after {
    border-color: var(--primary-purple);
    box-shadow: 0 8px 30px var(--shadow-purple);
}

.comparison-header {
    padding: 2rem;
    text-align: center;
    border-bottom: 1px solid var(--border-color);
}

.comparison-header.highlight {
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.1), rgba(118, 75, 162, 0.1));
}

.comparison-header h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.comparison-header p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.comparison-items {
    padding: 2rem;
}

.comparison-item {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    padding: 1rem 0;
    border-bottom: 1px solid rgba(102, 126, 234, 0.05);
}

.comparison-item:last-child {
    border-bottom: none;
}

.comparison-item .icon {
    font-size: 1.25rem;
    flex-shrink: 0;
    margin-top: 0.25rem;
}

.comparison-item span:not(.icon) {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Trust Signals Section */
.trust-signals {
    padding: 6rem 2rem;
    background: var(--bg-dark);
}

.trust-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.trust-item {
    text-align: center;
    padding: 2rem;
}

.trust-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.trust-item h4 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
    background: linear-gradient(135deg, var(--primary-purple), var(--primary-purple-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.trust-item p {
    color: var(--text-secondary);
    line-height: 1.6;
    font-size: 0.9rem;
}

/* Social Proof Section */
.social-proof {
    padding: 4rem 2rem;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.05), rgba(118, 75, 162, 0.05));
}

.stats-bar {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 3rem;
    max-width: 1200px;
    margin: 0 auto;
    text-align: center;
}

.stat-item {
    padding: 1rem;
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 900;
    background: linear-gradient(135deg, var(--primary-purple), var(--primary-purple-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 0.5rem;
}

.stat-text {
    color: var(--text-secondary);
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* Responsive */
@media (max-width: 768px) {
    .comparison-table {
        grid-template-columns: 1fr;
    }
}