/* CSS Variables */
:root {
    --primary: #667eea;
    --primary-dark: #764ba2;
    --gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-text: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --bg: #0a0a0f;
    --bg-card: #12121a;
    --bg-card-hover: #1a1a24;
    --text: #ffffff;
    --text-muted: #a1a1aa;
    --border: #27272a;
    --success: #22c55e;
    --warning: #f59e0b;
    --danger: #ef4444;
    --radius: 12px;
    --radius-lg: 20px;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -2px rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4), 0 4px 6px -4px rgba(0, 0, 0, 0.3);
}

/* Reset & Base */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Gradient Text */
.gradient-text {
    background: var(--gradient-text);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 14px 28px;
    border-radius: var(--radius);
    font-weight: 600;
    font-size: 1rem;
    text-decoration: none;
    transition: all 0.3s ease;
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: var(--gradient);
    color: white;
    box-shadow: 0 4px 20px rgba(102, 126, 234, 0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 30px rgba(102, 126, 234, 0.5);
}

.btn-secondary {
    background: var(--bg-card);
    color: var(--text);
    border: 1px solid var(--border);
}

.btn-secondary:hover {
    background: var(--bg-card-hover);
    border-color: var(--primary);
}

.btn-lg {
    padding: 18px 36px;
    font-size: 1.1rem;
}

.chrome-icon {
    flex-shrink: 0;
}

/* Navigation */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 16px 0;
    background: rgba(10, 10, 15, 0.8);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid transparent;
    transition: all 0.3s ease;
}

.nav.scrolled {
    border-bottom-color: var(--border);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    color: var(--text);
    font-weight: 700;
    font-size: 1.25rem;
}

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

.nav-links {
    display: flex;
    align-items: center;
    gap: 32px;
}

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

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

.nav-cta {
    background: var(--gradient);
    padding: 10px 20px !important;
    border-radius: var(--radius);
    color: white !important;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
}

.nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text);
    transition: all 0.3s ease;
}

/* Hero Section */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: 120px 0 80px;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(ellipse at 50% 0%, rgba(102, 126, 234, 0.15) 0%, transparent 60%),
                radial-gradient(ellipse at 80% 50%, rgba(118, 75, 162, 0.1) 0%, transparent 50%);
    pointer-events: none;
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.hero-badge {
    display: inline-block;
    padding: 8px 16px;
    background: rgba(102, 126, 234, 0.15);
    border: 1px solid rgba(102, 126, 234, 0.3);
    border-radius: 100px;
    font-size: 0.875rem;
    color: var(--primary);
    margin-bottom: 24px;
}

.hero-title {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 24px;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-muted);
    margin-bottom: 40px;
    max-width: 520px;
}

.hero-cta {
    display: flex;
    flex-direction: column;
    gap: 16px;
    align-items: flex-start;
}

.hero-users {
    font-size: 0.875rem;
    color: var(--text-muted);
}

.hero-scroll {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    color: var(--text-muted);
    font-size: 0.875rem;
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 100% { transform: translateX(-50%) translateY(0); }
    50% { transform: translateX(-50%) translateY(10px); }
}

/* Demo Browser */
.demo-browser {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

.demo-browser-bar {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 12px 16px;
    background: rgba(0, 0, 0, 0.3);
    border-bottom: 1px solid var(--border);
}

.demo-dots {
    display: flex;
    gap: 6px;
}

.demo-dots span {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--border);
}

.demo-dots span:nth-child(1) { background: #ef4444; }
.demo-dots span:nth-child(2) { background: #f59e0b; }
.demo-dots span:nth-child(3) { background: #22c55e; }

.demo-url {
    flex: 1;
    padding: 6px 12px;
    background: rgba(0, 0, 0, 0.3);
    border-radius: 6px;
    font-size: 0.8rem;
    color: var(--text-muted);
    font-family: monospace;
}

.demo-content {
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.demo-result {
    position: relative;
    padding: 16px;
    background: rgba(255, 255, 255, 0.02);
    border-radius: var(--radius);
    border: 1px solid var(--border);
}

.demo-badge {
    display: inline-block;
    padding: 4px 10px;
    border-radius: 100px;
    font-size: 0.7rem;
    font-weight: 600;
    margin-bottom: 8px;
}

.demo-badge.human {
    background: rgba(34, 197, 94, 0.15);
    color: var(--success);
}

.demo-badge.ai {
    background: rgba(239, 68, 68, 0.15);
    color: var(--danger);
}

.demo-title {
    font-weight: 600;
    margin-bottom: 6px;
    color: #6b9eff;
}

.demo-snippet {
    font-size: 0.875rem;
    color: var(--text-muted);
}

.demo-ai .demo-blur {
    filter: blur(4px);
    transition: filter 0.3s ease;
}

.demo-ai:hover .demo-blur {
    filter: blur(0);
}

.demo-overlay {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    padding: 8px 16px;
    background: rgba(239, 68, 68, 0.9);
    color: white;
    font-size: 0.8rem;
    font-weight: 600;
    border-radius: var(--radius);
    opacity: 1;
    transition: opacity 0.3s ease;
}

.demo-ai:hover .demo-overlay {
    opacity: 0;
}

.demo-ai.scanning .demo-badge {
    animation: pulse 1.5s ease-in-out infinite;
}

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

/* Section Styles */
section {
    padding: 100px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-badge {
    display: inline-block;
    padding: 8px 16px;
    background: rgba(102, 126, 234, 0.1);
    border: 1px solid rgba(102, 126, 234, 0.2);
    border-radius: 100px;
    font-size: 0.875rem;
    color: var(--primary);
    margin-bottom: 20px;
    text-transform: uppercase;
    letter-spacing: 1px;
    font-weight: 600;
}

.section-header h2 {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 800;
    margin-bottom: 16px;
}

.section-desc {
    font-size: 1.125rem;
    color: var(--text-muted);
    max-width: 600px;
    margin: 0 auto;
}

/* Problem Section */
.problem {
    background: linear-gradient(180deg, var(--bg) 0%, var(--bg-card) 100%);
}

.problem-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    margin-bottom: 60px;
}

.problem-card {
    padding: 32px 24px;
    background: var(--bg);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border);
    text-align: center;
    transition: all 0.3s ease;
}

.problem-card:hover {
    border-color: var(--primary);
    transform: translateY(-4px);
}

.problem-icon {
    font-size: 2.5rem;
    margin-bottom: 16px;
}

.problem-card h3 {
    font-size: 1.125rem;
    margin-bottom: 12px;
}

.problem-card p {
    font-size: 0.9rem;
    color: var(--text-muted);
}

.problem-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
    padding: 40px;
    background: var(--bg);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border);
}

.stat {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 3rem;
    font-weight: 800;
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

/* Solution Section */
.solution {
    background: var(--bg-card);
}

.solution-flow {
    max-width: 700px;
    margin: 0 auto;
}

.flow-step {
    display: flex;
    gap: 24px;
    align-items: flex-start;
}

.flow-number {
    flex-shrink: 0;
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient);
    border-radius: 50%;
    font-size: 1.25rem;
    font-weight: 700;
}

.flow-content h3 {
    font-size: 1.25rem;
    margin-bottom: 8px;
}

.flow-content p {
    color: var(--text-muted);
    margin-bottom: 12px;
}

.flow-tag {
    display: inline-block;
    padding: 6px 12px;
    background: rgba(102, 126, 234, 0.1);
    border-radius: 100px;
    font-size: 0.8rem;
    color: var(--primary);
}

.flow-connector {
    width: 2px;
    height: 40px;
    background: var(--border);
    margin-left: 23px;
    margin: 16px 0 16px 23px;
}

/* Features Section */
.features-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.feature-card {
    padding: 32px 24px;
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border);
    transition: all 0.3s ease;
}

.feature-card:hover {
    border-color: var(--primary);
    background: var(--bg-card-hover);
}

.feature-icon {
    font-size: 2rem;
    margin-bottom: 16px;
}

.feature-card h3 {
    font-size: 1.125rem;
    margin-bottom: 8px;
}

.feature-card p {
    font-size: 0.9rem;
    color: var(--text-muted);
}

/* Pricing Section */
.pricing {
    background: linear-gradient(180deg, var(--bg) 0%, var(--bg-card) 100%);
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    align-items: stretch;
}

.pricing-card {
    padding: 40px 32px;
    background: var(--bg);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    transition: all 0.3s ease;
}

.pricing-card:hover {
    border-color: var(--primary);
}

.pricing-card.featured {
    border-color: var(--primary);
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.1) 0%, rgba(118, 75, 162, 0.1) 100%);
    transform: scale(1.05);
}

.pricing-badge {
    display: inline-block;
    padding: 6px 12px;
    background: rgba(102, 126, 234, 0.15);
    border-radius: 100px;
    font-size: 0.75rem;
    color: var(--primary);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 16px;
    align-self: flex-start;
}

.pricing-card h3 {
    font-size: 1.5rem;
    margin-bottom: 16px;
}

.pricing-price {
    margin-bottom: 24px;
}

.price {
    font-size: 3rem;
    font-weight: 800;
}

.price-period {
    font-size: 1rem;
    color: var(--text-muted);
}

.pricing-features {
    list-style: none;
    flex: 1;
    margin-bottom: 32px;
}

.pricing-features li {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 0;
    border-bottom: 1px solid var(--border);
    font-size: 0.95rem;
}

.pricing-features li:last-child {
    border-bottom: none;
}

.check {
    color: var(--success);
    font-weight: 700;
}

.pricing-card .btn {
    width: 100%;
    justify-content: center;
}

/* FAQ Section */
.faq-grid {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.faq-item {
    background: var(--bg-card);
    border-radius: var(--radius);
    border: 1px solid var(--border);
    overflow: hidden;
}

.faq-question {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px 24px;
    background: none;
    border: none;
    color: var(--text);
    font-size: 1rem;
    font-weight: 600;
    text-align: left;
    cursor: pointer;
    transition: all 0.3s ease;
}

.faq-question:hover {
    background: var(--bg-card-hover);
}

.faq-question svg {
    flex-shrink: 0;
    transition: transform 0.3s ease;
    color: var(--text-muted);
}

.faq-item.open .faq-question svg {
    transform: rotate(180deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.faq-item.open .faq-answer {
    max-height: 200px;
}

.faq-answer p {
    padding: 0 24px 20px;
    color: var(--text-muted);
    line-height: 1.7;
}

/* CTA Section */
.cta {
    background: var(--gradient);
    text-align: center;
}

.cta-content h2 {
    font-size: clamp(2rem, 4vw, 3rem);
    margin-bottom: 16px;
}

.cta-content .gradient-text {
    background: white;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.cta-content p {
    font-size: 1.125rem;
    opacity: 0.9;
    margin-bottom: 32px;
}

.cta .btn-primary {
    background: white;
    color: var(--primary-dark);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
}

.cta .btn-primary:hover {
    background: #f0f0f0;
}

/* Footer */
.footer {
    background: var(--bg);
    padding: 60px 0 30px;
    border-top: 1px solid var(--border);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 40px;
}

.footer-brand p {
    color: var(--text-muted);
    margin-top: 16px;
    max-width: 280px;
}

.footer-links h4 {
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-muted);
    margin-bottom: 16px;
}

.footer-links a {
    display: block;
    color: var(--text);
    text-decoration: none;
    padding: 6px 0;
    transition: color 0.3s ease;
}

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

.footer-bottom {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: 30px;
    border-top: 1px solid var(--border);
}

.footer-bottom p {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.footer-social {
    display: flex;
    gap: 16px;
}

.footer-social a {
    color: var(--text-muted);
    transition: color 0.3s ease;
}

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

/* Responsive */
@media (max-width: 1024px) {
    .hero .container {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .hero-content {
        order: 1;
    }
    
    .hero-demo {
        order: 2;
        max-width: 600px;
        margin: 0 auto;
    }
    
    .hero-cta {
        align-items: center;
    }
    
    .problem-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .pricing-grid {
        grid-template-columns: 1fr;
        max-width: 400px;
        margin: 0 auto;
    }
    
    .pricing-card.featured {
        transform: none;
    }
    
    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        flex-direction: column;
        background: var(--bg);
        padding: 20px;
        border-bottom: 1px solid var(--border);
        gap: 16px;
    }
    
    .nav-links.open {
        display: flex;
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .hero {
        padding: 100px 0 60px;
        min-height: auto;
    }
    
    .hero-scroll {
        display: none;
    }
    
    section {
        padding: 60px 0;
    }
    
    .problem-grid {
        grid-template-columns: 1fr;
    }
    
    .problem-stats {
        grid-template-columns: 1fr;
        gap: 24px;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .footer-brand {
        display: flex;
        flex-direction: column;
        align-items: center;
    }
    
    .footer-brand p {
        max-width: none;
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: 16px;
    }
}

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

.animate-in {
    animation: fadeInUp 0.6s ease forwards;
}

[data-animate] {
    opacity: 0;
}

/* Accessibility: Focus states */
a:focus-visible, button:focus-visible, .btn:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

/* Skip link */
.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--primary);
    color: white;
    padding: 8px 16px;
    z-index: 10000;
    text-decoration: none;
}
.skip-link:focus { top: 0; }