:root {
    --primary-color: #3b82f6;
    --primary-hover: #2563eb;
    --secondary-color: #1e293b;
    --bg-color: #ffffff;
    --bg-light: #f8fafc;
    --text-main: #334155;
    --text-muted: #64748b;
    --border-color: #e2e8f0;
    --radius: 8px;
    --transition: all 0.3s ease;
}

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

html { scroll-behavior: smooth; }

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-main);
    background-color: var(--bg-color);
}

a {
    text-decoration: none;
    color: inherit;
}

ul {
    list-style: none;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

h1, h2, h3, h4 {
    color: var(--secondary-color);
    margin-bottom: 1rem;
    line-height: 1.2;
}

.section-title {
    text-align: center;
    font-size: 2.2rem;
    margin-bottom: 3rem;
}

.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius);
    font-weight: 600;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    border: 2px solid transparent;
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
}

.btn-primary:hover {
    background-color: var(--primary-hover);
}

.btn-secondary {
    background-color: var(--secondary-color);
    color: white;
}

.btn-secondary:hover {
    background-color: #0f172a;
}

.btn-outline {
    background-color: transparent;
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.btn-outline:hover {
    background-color: var(--primary-color);
    color: white;
}

.btn-large {
    padding: 1rem 2.5rem;
    font-size: 1.1rem;
}

.btn-full {
    display: block;
    width: 100%;
}

.navbar {
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    z-index: 100;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

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

.nav-links a {
    font-weight: 500;
    transition: var(--transition);
}

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

.section {
    padding: 5rem 0;
}

.bg-light {
    background-color: var(--bg-light);
}

.hero-section {
    padding: 8rem 0 6rem;
    text-align: center;
    background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
}

.hero-title {
    font-size: 3.5rem;
    margin-bottom: 1.5rem;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-muted);
    max-width: 800px;
    margin: 0 auto 2.5rem;
}

.hero-actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.feature-card {
    padding: 2rem;
    background: white;
    border-radius: var(--radius);
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    text-align: center;
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

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

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

.ai-streaming-card {
    display: flex;
    background: white;
    border-radius: var(--radius);
    box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.1);
    overflow: hidden;
    border: 1px solid var(--border-color);
}

.support-col {
    flex: 1;
    padding: 3rem;
}

.support-col:first-child {
    border-right: 1px solid var(--border-color);
}

.support-col h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.support-col p {
    color: var(--text-muted);
    font-size: 1.1rem;
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    align-items: stretch;
}

.pricing-card {
    padding: 2.5rem;
    background: white;
    border-radius: var(--radius);
    border: 1px solid var(--border-color);
    text-align: center;
    position: relative;
    display: flex;
    flex-direction: column;
}

.pricing-card.popular {
    border: 2px solid var(--primary-color);
    transform: scale(1.05);
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    z-index: 10;
}

.badge {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--primary-color);
    color: white;
    padding: 0.2rem 1rem;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: bold;
}

.price {
    font-size: 3rem;
    font-weight: bold;
    color: var(--secondary-color);
    margin: 1rem 0;
}

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

.pricing-features {
    margin: 1.5rem 0 2.5rem;
    text-align: left;
    flex-grow: 1;
}

.pricing-features li {
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-muted);
    position: relative;
    padding-left: 1.5rem;
}

.pricing-features li::before {
    content: "✓";
    color: var(--primary-color);
    position: absolute;
    left: 0;
    font-weight: bold;
}

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

.reviews-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.review-card {
    background: white;
    padding: 2rem;
    border-radius: var(--radius);
    border: 1px solid var(--border-color);
}

.stars {
    color: #fbbf24;
    font-size: 1.25rem;
    margin-bottom: 1rem;
}

.review-text {
    font-style: italic;
    margin-bottom: 1.5rem;
    color: var(--text-muted);
}

.reviewer {
    font-weight: bold;
}

.faq-list {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    margin-bottom: 1.5rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.faq-item:last-child {
    border-bottom: none;
    margin-bottom: 0;
    padding-bottom: 0;
}

.faq-question {
    font-size: 1.2rem;
    margin-bottom: 0.5rem;
}

.faq-answer {
    color: var(--text-muted);
}

.footer {
    background-color: var(--secondary-color);
    color: white;
    padding: 3rem 0;
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 1.5rem;
}

.footer-links {
    display: flex;
    gap: 1.5rem;
}

.footer-links a {
    color: #cbd5e1;
    font-size: 0.9rem;
}

.footer-links a:hover {
    color: white;
}

/* Page content for sub-pages */
.page-content {
    padding: 4rem 0 6rem;
    max-width: 800px;
    margin: 0 auto;
}

.page-content h1 {
    font-size: 2.5rem;
    margin-bottom: 2rem;
    border-bottom: 2px solid var(--primary-color);
    padding-bottom: 0.5rem;
    display: inline-block;
}

.page-content h2 {
    margin-top: 2.5rem;
    font-size: 1.5rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.5rem;
    margin-bottom: 1rem;
}

.page-content p {
    margin-bottom: 1rem;
    font-size: 1.05rem;
}

.page-content ul {
    margin-bottom: 1.5rem;
    padding-left: 20px;
}

.page-content ul li {
    margin-bottom: 0.5rem;
    list-style-type: disc;
}

.sitemap-list {
    margin-bottom: 2rem;
}

.sitemap-list a {
    color: var(--primary-color);
}

.sitemap-list a:hover {
    text-decoration: underline;
}

/* Responsive */
@media (max-width: 768px) {
    .nav-links { display: none; }
    
    .hero-title { font-size: 2.2rem; }
    .hero-subtitle { font-size: 1rem; }
    
    .hero-actions { 
        flex-direction: column; 
    }
    .hero-actions .btn { width: 100%; }
    
    .features-grid, 
    .reviews-grid {
        grid-template-columns: 1fr;
    }
    
    .pricing-grid {
        grid-template-columns: 1fr;
        gap: 3rem;
    }
    
    .pricing-card.popular {
        transform: scale(1);
    }
    
    .ai-streaming-card {
        flex-direction: column;
    }
    
    .support-col:first-child { 
        border-right: none; 
        border-bottom: 1px solid var(--border-color); 
    }
    
    .footer-bottom { 
        flex-direction: column; 
        gap: 1rem; 
        text-align: center; 
    }
}

/* Scroll margin for sticky header */
[id] {
    scroll-margin-top: 80px;
}

/* Skip to main content */
.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--primary-color);
    color: #000;
    padding: 8px;
    z-index: 9999;
    transition: top 0.3s;
}
.skip-link:focus {
    top: 0;
}

/* FAQ Details/Summary reset */
details.faq-item {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    margin-bottom: 1rem;
    padding: 1.5rem;
}
details.faq-item summary {
    cursor: pointer;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-main);
    list-style: none; /* Hide default arrow */
    position: relative;
    padding-right: 1.5rem;
}
details.faq-item summary::-webkit-details-marker {
    display: none;
}
details.faq-item summary::after {
    content: '+';
    position: absolute;
    right: 0;
    top: 50%;
    transform: translateY(-50%);
    color: var(--primary-color);
    font-size: 1.5rem;
}
details[open].faq-item summary::after {
    content: '-';
}
details.faq-item p {
    margin-top: 1rem;
    margin-bottom: 0;
}