/* TabSaver Landing Page Styles */
/* Based on the extension's design system */

:root {
    /* Colors from extension */
    --color-primary: #4299e1;
    --color-primary-hover: #3182ce;
    --color-secondary: #718096;
    --color-text-primary: #2d3748;
    --color-text-secondary: #4a5568;
    --color-text-muted: #718096;
    --color-background: #ffffff;
    --color-background-gray: #f7fafc;
    --color-border: #e2e8f0;
    --color-border-hover: #cbd5e0;
    --color-success: #48bb78;
    --color-premium: #667eea;
    --color-premium-secondary: #764ba2;
    --color-premium-hover: #5a67d8;
    --color-gold: #FFD700;
    
    /* Gradients from extension */
    --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-premium: linear-gradient(45deg, #667eea, #764ba2);
    --gradient-premium-hover: linear-gradient(45deg, #5a6fd8, #6a4190);
    
    /* Spacing */
    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 12px;
    --space-lg: 16px;
    --space-xl: 20px;
    --space-2xl: 24px;
    --space-3xl: 32px;
    --space-4xl: 40px;
    --space-5xl: 48px;
    --space-6xl: 64px;
    --space-8xl: 96px;
    
    /* Border radius */
    --radius-sm: 3px;
    --radius-md: 4px;
    --radius-lg: 6px;
    --radius-xl: 8px;
    --radius-2xl: 12px;
    --radius-3xl: 16px;
    --radius-4xl: 24px;
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-base: 0.2s ease;
    --transition-slow: 0.3s ease;
    
    /* Typography */
    --font-size-xs: 12px;
    --font-size-sm: 14px;
    --font-size-md: 16px;
    --font-size-lg: 18px;
    --font-size-xl: 20px;
    --font-size-2xl: 24px;
    --font-size-3xl: 30px;
    --font-size-4xl: 36px;
    --font-size-5xl: 48px;
    --line-height-tight: 1.25;
    --line-height-base: 1.5;
    --line-height-relaxed: 1.6;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-base: 0 2px 4px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 4px 12px rgba(102, 126, 234, 0.15);
    --shadow-xl: 0 10px 25px rgba(0, 0, 0, 0.1);
    --shadow-2xl: 0 25px 50px rgba(0, 0, 0, 0.25);
}

/* Dark theme variables */
[data-theme="dark"] {
    --color-primary: #5f7cfa;
    --color-primary-hover: #4c6ef5;
    --color-secondary: #8b9dc3;
    --color-text-primary: #ffffff;
    --color-text-secondary: #f1f5f9;
    --color-text-muted: #cbd5e1;
    --color-background: #0f1419;
    --color-background-gray: #1e293b;
    --color-border: #2d3748;
    --color-border-hover: #4a5568;
    --color-success: #34d399;
    --color-premium: #8b5cf6;
    --color-premium-secondary: #a78bfa;
    --color-premium-hover: #7c3aed;
    --color-gold: #fbbf24;
    
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.8);
    --shadow-base: 0 2px 4px rgba(0, 0, 0, 0.6);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.7);
    --shadow-lg: 0 4px 12px rgba(95, 124, 250, 0.15);
    --shadow-xl: 0 10px 25px rgba(0, 0, 0, 0.8);
    --shadow-2xl: 0 25px 50px rgba(0, 0, 0, 0.9);
}

/* Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    font-size: var(--font-size-md);
    line-height: var(--line-height-base);
    color: var(--color-text-primary);
    background: var(--color-background);
    transition: var(--transition-base);
}

.container {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Header */
.header {
    background: linear-gradient(45deg, #667eea, #764ba2, #667eea, #764ba2);
    background-size: 400% 400%;
    animation: gradientShift 8s ease-in-out infinite;
    color: var(--color-background);
    padding: var(--space-2xl) var(--space-4xl);
    text-align: center;
    position: relative;
    overflow: hidden;
}

.header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 30% 20%, rgba(255, 255, 255, 0.1) 0%, transparent 50%),
                radial-gradient(circle at 70% 80%, rgba(255, 255, 255, 0.05) 0%, transparent 50%);
    pointer-events: none;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--space-5xl);
    position: relative;
    z-index: 1;
}

.header-left {
    text-align: left;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    margin-bottom: var(--space-sm);
}

.logo-icon {
    font-size: var(--font-size-3xl);
}

.title {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    margin: 0;
}

.subtitle {
    font-size: var(--font-size-lg);
    opacity: 0.9;
    margin: 0;
}

.header-right {
    display: flex;
    align-items: center;
}

.theme-toggle {
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: var(--color-background);
    width: 48px;
    height: 48px;
    border-radius: var(--radius-xl);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition-base);
    font-size: var(--font-size-xl);
}

.theme-toggle:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
}

/* Hero Section */
.hero-section {
    position: relative;
    z-index: 1;
    max-width: 800px;
    margin: 0 auto;
}

.hero-title {
    font-size: var(--font-size-5xl);
    font-weight: 700;
    margin-bottom: var(--space-xl);
    line-height: var(--line-height-tight);
}

.hero-description {
    font-size: var(--font-size-xl);
    opacity: 0.9;
    margin-bottom: var(--space-5xl);
    line-height: var(--line-height-relaxed);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.hero-actions {
    display: flex;
    gap: var(--space-xl);
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
}

/* Main Content */
.main-content {
    flex: 1;
    padding: var(--space-8xl) var(--space-4xl);
}

/* Section Headers */
.section-header {
    text-align: center;
    margin-bottom: var(--space-6xl);
}

.section-header h2 {
    font-size: var(--font-size-4xl);
    font-weight: 700;
    color: var(--color-text-primary);
    margin-bottom: var(--space-lg);
}

.section-header p {
    font-size: var(--font-size-xl);
    color: var(--color-text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* Button System */
.btn {
    border: none;
    border-radius: var(--radius-xl);
    padding: var(--space-lg) var(--space-3xl);
    font-size: var(--font-size-md);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-base);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    text-decoration: none;
    white-space: nowrap;
    position: relative;
    overflow: hidden;
}

.btn:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn:active:not(:disabled) {
    transform: translateY(0);
}

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

.btn-primary:hover:not(:disabled) {
    background: var(--color-primary-hover);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.1);
    color: var(--color-background);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.btn-secondary:hover:not(:disabled) {
    background: rgba(255, 255, 255, 0.2);
}

.btn-premium {
    background: var(--gradient-premium);
    color: var(--color-background);
    position: relative;
}

.btn-premium:hover:not(:disabled) {
    background: var(--gradient-premium-hover);
}

.btn-premium::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s;
}

.btn-premium:hover::before {
    left: 100%;
}

.install-btn-large {
    padding: var(--space-xl) var(--space-5xl);
    font-size: var(--font-size-lg);
}

.btn-icon {
    font-size: var(--font-size-lg);
}

/* Features Section */
.features-section {
    margin-bottom: var(--space-8xl);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-3xl);
    max-width: 1200px;
    margin: 0 auto;
}

.feature-card {
    background: var(--color-background);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-3xl);
    padding: var(--space-4xl);
    text-align: center;
    transition: var(--transition-base);
    position: relative;
    overflow: hidden;
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
    border-color: var(--color-border-hover);
}

.feature-card.premium {
    border-color: var(--color-premium);
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.05) 0%, rgba(118, 75, 162, 0.05) 100%);
}

.feature-card.premium::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-premium);
}

.feature-icon {
    font-size: var(--font-size-5xl);
    margin-bottom: var(--space-xl);
    display: block;
}

.feature-card h3 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--space-md);
}

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

.premium-badge {
    position: absolute;
    top: var(--space-lg);
    right: var(--space-lg);
    background: var(--gradient-premium);
    color: var(--color-background);
    padding: var(--space-xs) var(--space-md);
    border-radius: var(--radius-lg);
    font-size: var(--font-size-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* How it works Section */
.how-it-works {
    margin-bottom: var(--space-8xl);
}

.steps-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-4xl);
    max-width: 1000px;
    margin: 0 auto;
}

.step-card {
    text-align: center;
    position: relative;
}

.step-number {
    width: 60px;
    height: 60px;
    background: var(--gradient-primary);
    color: var(--color-background);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-2xl);
    font-weight: 700;
    margin: 0 auto var(--space-xl);
    position: relative;
    z-index: 1;
}

.step-card h3 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--space-md);
}

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

/* Pricing Section */
.pricing-section {
    margin-bottom: var(--space-8xl);
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    max-width: 900px;
    margin: 0 auto;
}

.price-card {
    background: var(--color-background);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-3xl);
    padding: var(--space-4xl);
    text-align: center;
    position: relative;
    transition: var(--transition-base);
}

.price-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
    border-color: var(--color-border-hover);
}

.price-card.recommended {
    border-color: var(--color-premium);
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.05) 0%, rgba(118, 75, 162, 0.05) 100%);
    transform: scale(1.05);
}

.price-card.recommended:hover {
    transform: scale(1.05) translateY(-4px);
}

.recommended-badge {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--color-gold);
    color: #333;
    padding: var(--space-sm) var(--space-xl);
    border-radius: var(--radius-2xl);
    font-size: var(--font-size-sm);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.plan-name {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--color-text-primary);
    margin-bottom: var(--space-lg);
}

.plan-price {
    margin-bottom: var(--space-md);
}

.price {
    font-size: var(--font-size-4xl);
    font-weight: 700;
    color: var(--color-text-primary);
}

.period {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    font-weight: 400;
}

.plan-savings {
    color: var(--color-success);
    font-size: var(--font-size-sm);
    font-weight: 600;
    margin-bottom: var(--space-xl);
}

.plan-features {
    list-style: none;
    margin-bottom: var(--space-4xl);
    text-align: left;
}

.plan-features li {
    padding: var(--space-sm) 0;
    color: var(--color-text-secondary);
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.plan-btn {
    width: 100%;
    padding: var(--space-lg) var(--space-xl);
}

/* CTA Section */
.cta-section {
    background: var(--color-background-gray);
    padding: var(--space-8xl) var(--space-4xl);
    text-align: center;
    border-radius: var(--radius-4xl);
    margin: var(--space-8xl) auto;
    max-width: 1200px;
}

.cta-content h2 {
    font-size: var(--font-size-4xl);
    font-weight: 700;
    color: var(--color-text-primary);
    margin-bottom: var(--space-xl);
}

.cta-content p {
    font-size: var(--font-size-xl);
    color: var(--color-text-secondary);
    margin-bottom: var(--space-5xl);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.cta-actions {
    margin-bottom: var(--space-3xl);
}

.cta-note p {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    margin: 0;
    text-align: center;
}

/* Footer */
.footer {
    background: var(--color-background-gray);
    padding: var(--space-5xl) var(--space-4xl) var(--space-3xl);
    border-top: 1px solid var(--color-border);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--space-3xl);
    max-width: 1200px;
    margin-left: auto;
    margin-right: auto;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    margin-bottom: var(--space-md);
}

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

.footer-description {
    color: var(--color-text-secondary);
    margin: 0;
}

.footer-links {
    display: flex;
    gap: var(--space-3xl);
}

.footer-link {
    color: var(--color-text-secondary);
    text-decoration: none;
    font-size: var(--font-size-sm);
    transition: var(--transition-base);
}

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

.footer-bottom {
    text-align: center;
    padding-top: var(--space-3xl);
    border-top: 1px solid var(--color-border);
    max-width: 1200px;
    margin: 0 auto;
}

.footer-bottom p {
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
    margin: 0;
}

/* Demo Modal */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.8);
    display: none;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    padding: var(--space-xl);
}

.modal {
    background: var(--color-background);
    border-radius: var(--radius-3xl);
    max-width: 800px;
    width: 100%;
    max-height: 90vh;
    overflow: hidden;
    box-shadow: var(--shadow-2xl);
    animation: modalSlide 0.3s ease;
}

.modal-header {
    padding: var(--space-3xl) var(--space-3xl) var(--space-xl);
    border-bottom: 1px solid var(--color-border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h3 {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--color-text-primary);
    margin: 0;
}

.modal-close {
    background: none;
    border: none;
    font-size: var(--font-size-3xl);
    cursor: pointer;
    color: var(--color-text-muted);
    padding: var(--space-sm);
    border-radius: var(--radius-md);
    transition: var(--transition-base);
}

.modal-close:hover {
    background: var(--color-background-gray);
    color: var(--color-text-primary);
}

.modal-body {
    padding: var(--space-3xl);
    overflow-y: auto;
    max-height: calc(90vh - 120px);
}

.demo-content {
    display: flex;
    flex-direction: column;
    gap: var(--space-3xl);
}

.demo-screenshot {
    background: var(--color-background-gray);
    border-radius: var(--radius-2xl);
    padding: var(--space-xl);
    border: 1px solid var(--color-border);
}

.screenshot-placeholder {
    background: var(--color-background);
    border-radius: var(--radius-xl);
    padding: var(--space-xl);
    border: 1px solid var(--color-border);
}

.screenshot-header {
    background: var(--gradient-primary);
    color: var(--color-background);
    padding: var(--space-lg);
    border-radius: var(--radius-lg);
    text-align: center;
    margin-bottom: var(--space-lg);
}

.screenshot-title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--space-xs);
}

.screenshot-subtitle {
    font-size: var(--font-size-sm);
    opacity: 0.9;
}

.screenshot-content {
    padding: var(--space-lg);
}

.section-title {
    font-size: var(--font-size-md);
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--space-md);
}

.tab-list {
    margin-bottom: var(--space-lg);
}

.tab-item {
    display: flex;
    align-items: center;
    padding: var(--space-md);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    margin-bottom: var(--space-sm);
    background: var(--color-background);
}

.tab-checkbox {
    margin-right: var(--space-md);
    font-size: var(--font-size-md);
}

.tab-info {
    flex: 1;
}

.tab-title {
    font-weight: 500;
    color: var(--color-text-primary);
    margin-bottom: var(--space-xs);
}

.tab-url {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
}

.save-section {
    display: flex;
    gap: var(--space-md);
    align-items: center;
}

.session-input {
    flex: 1;
    padding: var(--space-md);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-lg);
    font-size: var(--font-size-sm);
}

.save-btn {
    background: var(--color-primary);
    color: var(--color-background);
    border: none;
    padding: var(--space-md) var(--space-xl);
    border-radius: var(--radius-lg);
    font-weight: 600;
    cursor: pointer;
}

.demo-description h4 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--space-md);
}

.demo-description p {
    color: var(--color-text-secondary);
    line-height: var(--line-height-relaxed);
}

@keyframes modalSlide {
    from {
        transform: translateY(-20px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

/* Responsive Design */
@media (max-width: 768px) {
    .header {
        padding: var(--space-xl) var(--space-xl);
    }
    
    .header-content {
        flex-direction: column;
        align-items: center;
        gap: var(--space-xl);
        text-align: center;
    }
    
    .header-left {
        text-align: center;
    }
    
    .hero-title {
        font-size: var(--font-size-4xl);
    }
    
    .hero-description {
        font-size: var(--font-size-lg);
    }
    
    .hero-actions {
        flex-direction: column;
        gap: var(--space-lg);
    }
    
    .main-content {
        padding: var(--space-5xl) var(--space-xl);
    }
    
    .section-header h2 {
        font-size: var(--font-size-3xl);
    }
    
    .features-grid {
        grid-template-columns: 1fr;
        gap: var(--space-xl);
    }
    
    .steps-grid {
        grid-template-columns: 1fr;
        gap: var(--space-xl);
    }
    
    .pricing-grid {
        grid-template-columns: 1fr;
        gap: var(--space-xl);
    }
    
    .price-card.recommended {
        transform: none;
    }
    
    .price-card.recommended:hover {
        transform: translateY(-4px);
    }
    
    .footer-content {
        flex-direction: column;
        gap: var(--space-xl);
        text-align: center;
    }
    
    .footer-links {
        justify-content: center;
        flex-wrap: wrap;
        gap: var(--space-xl);
    }
    
    .cta-section {
        padding: var(--space-5xl) var(--space-xl);
        margin: var(--space-5xl) var(--space-xl);
    }
    
    .cta-content h2 {
        font-size: var(--font-size-3xl);
    }
    
    .demo-content {
        gap: var(--space-xl);
    }
    
    .modal {
        margin: var(--space-xl);
        max-width: calc(100vw - 2 * var(--space-xl));
    }
    
    .modal-header {
        padding: var(--space-xl);
    }
    
    .modal-body {
        padding: var(--space-xl);
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: var(--font-size-3xl);
    }
    
    .btn {
        padding: var(--space-md) var(--space-xl);
        font-size: var(--font-size-sm);
    }
    
    .install-btn-large {
        padding: var(--space-lg) var(--space-3xl);
        font-size: var(--font-size-md);
    }
    
    .feature-card {
        padding: var(--space-xl);
    }
    
    .price-card {
        padding: var(--space-xl);
    }
    
    .save-section {
        flex-direction: column;
        align-items: stretch;
    }
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Focus styles */
.btn:focus,
.theme-toggle:focus,
.modal-close:focus {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* Dark theme specific adjustments */
[data-theme="dark"] .feature-card {
    background: var(--color-background-gray);
    border-color: var(--color-border);
}

[data-theme="dark"] .price-card {
    background: var(--color-background-gray);
    border-color: var(--color-border);
}

[data-theme="dark"] .cta-section {
    background: var(--color-background-gray);
}

[data-theme="dark"] .footer {
    background: var(--color-background-gray);
    border-top-color: var(--color-border);
}

[data-theme="dark"] .modal {
    background: var(--color-background-gray);
}

[data-theme="dark"] .screenshot-placeholder {
    background: var(--color-background);
    border-color: var(--color-border);
}

[data-theme="dark"] .tab-item {
    background: var(--color-background-gray);
    border-color: var(--color-border);
}

[data-theme="dark"] .session-input {
    background: var(--color-background-gray);
    border-color: var(--color-border);
    color: var(--color-text-primary);
}

[data-theme="dark"] .demo-screenshot {
    background: var(--color-background);
    border-color: var(--color-border);
}

/* Animations */
@keyframes gradientShift {
    0% {
        background-position: 0% 50%;
    }
    25% {
        background-position: 100% 0%;
    }
    50% {
        background-position: 100% 50%;
    }
    75% {
        background-position: 0% 100%;
    }
    100% {
        background-position: 0% 50%;
    }
}