/* CSS Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Color Palette */
    --primary-color: #2563eb;
    --primary-dark: #1e40af;
    --primary-light: #3b82f6;
    --secondary-color: #64748b;
    --accent-color: #0891b2;
    
    --text-primary: #1e293b;
    --text-secondary: #475569;
    --text-light: #64748b;
    
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f1f5f9;
    
    --border-color: #e2e8f0;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    
    /* Typography */
    --font-body: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-heading: 'Segoe UI', -apple-system, BlinkMacSystemFont, Roboto, 'Helvetica Neue', Arial, sans-serif;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-primary);
}

/* Under Construction Banner */
.under-construction {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    text-align: center;
    padding: var(--spacing-lg);
}

.construction-content {
    max-width: 600px;
}

.construction-icon {
    font-size: 6rem;
    margin-bottom: var(--spacing-lg);
    cursor: pointer;
    user-select: none;
    transition: transform 0.1s ease;
}

.under-construction h1 {
    font-family: var(--font-heading);
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: var(--spacing-md);
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
}

.under-construction p {
    font-size: 1.5rem;
    opacity: 0.95;
    margin: 0;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* Header and Navigation */
header {
    background-color: var(--bg-primary);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 100;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) var(--spacing-md);
}

.logo h1 {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    color: var(--primary-color);
    font-weight: 700;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: var(--spacing-lg);
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s ease;
}

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

/* Hero Section */
.hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: var(--spacing-lg) 0;
    text-align: center;
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
}

.hero h2 {
    font-family: var(--font-heading);
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: var(--spacing-md);
    line-height: 1.2;
}

.hero-description {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-xl);
    opacity: 0.95;
    line-height: 1.7;
}

.btn-demo {
    background-color: rgba(255, 255, 255, 0.2);
    color: white;
    border: 2px solid white;
    margin-bottom: var(--spacing-md);
}

.btn-demo:hover {
    background-color: rgba(255, 255, 255, 0.3);
    transform: translateY(-2px);
}

.demo-container {
    margin-top: var(--spacing-lg);
    animation: slideDown 0.3s ease-out;
}

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

.demo-video {
    position: relative;
    padding-bottom: 56.25%; /* 16:9 aspect ratio */
    height: 0;
    overflow: hidden;
    max-width: 800px;
    margin: 0 auto;
    border-radius: 1rem;
    box-shadow: var(--shadow-xl);
}

.demo-video iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border-radius: 1rem;
}

.cta-buttons {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.875rem 2rem;
    border-radius: 0.5rem;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.2s ease;
    cursor: pointer;
    border: none;
    font-size: 1rem;
}

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

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background-color: transparent;
    color: white;
    border: 2px solid white;
}

.btn-secondary:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

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

/* Section Styles */
section {
    padding: var(--spacing-2xl) 0;
}

.section-title {
    font-family: var(--font-heading);
    font-size: 2.5rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: var(--spacing-xl);
    color: var(--text-primary);
}

/* Features Section */
.features {
    background-color: var(--bg-secondary);
}

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

.feature-card {
    background-color: var(--bg-primary);
    padding: var(--spacing-lg);
    border-radius: 1rem;
    box-shadow: var(--shadow-md);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

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

.feature-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-sm);
}

.feature-card h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

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

/* How It Works Section */
.how-it-works {
    background-color: var(--bg-primary);
}

.steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.step {
    text-align: center;
    padding: var(--spacing-lg);
}

.step-number {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.75rem;
    font-weight: 700;
    margin: 0 auto var(--spacing-md);
}

.step h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.step p {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Technology Section */
.technology {
    background-color: var(--bg-secondary);
}

.tech-content {
    max-width: 900px;
    margin: 0 auto;
}

.tech-content > p {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
    text-align: center;
    line-height: 1.8;
}

.tech-features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
}

.tech-item {
    background-color: var(--bg-primary);
    padding: var(--spacing-lg);
    border-radius: 0.75rem;
    border-left: 4px solid var(--primary-color);
}

.tech-item strong {
    display: block;
    font-size: 1.25rem;
    margin-bottom: var(--spacing-xs);
    color: var(--primary-color);
}

.tech-item p {
    color: var(--text-secondary);
}

/* Download Section */
.download {
    background-color: var(--bg-primary);
    padding-bottom: var(--spacing-xs);
}

.store-notice {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 1.5rem;
    padding: var(--spacing-xl);
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--spacing-lg);
    box-shadow: var(--shadow-xl);
    margin-bottom: var(--spacing-xl);
    color: white;
}

.store-badge {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.store-icon {
    font-size: 4rem;
    line-height: 1;
}

.store-text h3 {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
    color: white;
}

.store-text p {
    font-size: 1.125rem;
    opacity: 0.95;
    color: white;
}

.store-notice .btn-primary {
    flex-shrink: 0;
    white-space: nowrap;
}

.download-divider {
    text-align: center;
    margin: var(--spacing-xl) 0;
    position: relative;
}

.download-divider::before {
    content: '';
    position: absolute;
    left: 0;
    right: 0;
    top: 50%;
    height: 1px;
    background-color: var(--border-color);
}

.download-divider span {
    background-color: var(--bg-primary);
    padding: 0 var(--spacing-md);
    position: relative;
    color: var(--text-light);
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.875rem;
}

.download-alternative {
    max-width: 800px;
    margin: 0 auto var(--spacing-xl);
    background-color: var(--bg-secondary);
    padding: var(--spacing-lg);
    border-radius: 1rem;
}

.download-alternative h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.download-alternative p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

.download-alternative a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
}

.download-alternative a:hover {
    text-decoration: underline;
}

.code-block {
    background-color: var(--text-primary);
    color: #a5f3fc;
    padding: var(--spacing-md);
    border-radius: 0.5rem;
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
    font-size: 1rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-md);
    box-shadow: var(--shadow-md);
}

.code-block code {
    flex: 1;
    user-select: all;
}

.copy-btn {
    background-color: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: white;
    padding: 0.5rem 0.75rem;
    border-radius: 0.375rem;
    cursor: pointer;
    transition: background-color 0.2s ease;
    font-size: 1.25rem;
    flex-shrink: 0;
}

.copy-btn:hover {
    background-color: rgba(255, 255, 255, 0.2);
}

.download-content {
    max-width: 800px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
}

.download-info {
    background-color: var(--bg-secondary);
    padding: var(--spacing-lg);
    border-radius: 1rem;
}

.download-info h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.download-info ul {
    list-style-position: inside;
    margin-bottom: var(--spacing-md);
    color: var(--text-secondary);
}

.download-info li {
    padding: var(--spacing-xs) 0;
}

.download-note {
    background-color: #fef3c7;
    border-left: 4px solid #f59e0b;
    padding: var(--spacing-md);
    border-radius: 0.5rem;
    margin-top: var(--spacing-md);
}

.download-note strong {
    color: #92400e;
}

.download-buttons {
    text-align: center;
}

/* FAQ Section */
.faq {
    background-color: var(--bg-secondary);
}

.faq-list {
    max-width: 900px;
    margin: 0 auto;
}

.faq-item {
    background-color: var(--bg-primary);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
    border-radius: 0.75rem;
    box-shadow: var(--shadow-sm);
}

.faq-item h3 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    color: var(--primary-color);
}

.faq-item p {
    color: var(--text-secondary);
    line-height: 1.7;
}

.faq-item a {
    color: var(--primary-color);
    text-decoration: none;
}

.faq-item a:hover {
    text-decoration: underline;
}

/* Legal Section */
.legal {
    background-color: #fef2f2;
    border-top: 3px solid #ef4444;
}

.legal-content {
    max-width: 900px;
    margin: 0 auto;
    text-align: center;
}

.legal h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    color: #991b1b;
}

.legal p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    line-height: 1.7;
}

.copyright {
    color: var(--text-light);
    font-size: 0.875rem;
}

/* Footer */
footer {
    background-color: var(--text-primary);
    color: white;
    padding: var(--spacing-lg) 0;
}

footer .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

footer p {
    margin: 0;
    opacity: 0.9;
}

.footer-links {
    display: flex;
    gap: var(--spacing-lg);
}

.footer-links a {
    color: white;
    text-decoration: none;
    opacity: 0.9;
    transition: opacity 0.2s ease;
}

.footer-links a:hover {
    opacity: 1;
    text-decoration: underline;
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero h2 {
        font-size: 2rem;
    }
    
    .hero-description {
        font-size: 1.125rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .nav-links {
        gap: var(--spacing-sm);
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .steps {
        grid-template-columns: 1fr;
    }
    
    .tech-features {
        grid-template-columns: 1fr;
    }
    
    .store-notice {
        flex-direction: column;
        text-align: center;
    }
    
    .store-badge {
        flex-direction: column;
    }
    
    .store-notice .btn-primary {
        width: 100%;
    }
    
    .code-block {
        flex-direction: column;
        align-items: stretch;
    }
    
    .copy-btn {
        width: 100%;
    }
    
    footer .container {
        flex-direction: column;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .hero h2 {
        font-size: 1.75rem;
    }
    
    .cta-buttons {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
    }
    
    .nav-links {
        font-size: 0.875rem;
        gap: var(--spacing-xs);
    }
}