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

:root {
    --primary-color: #007AFF;
    --primary-dark: #0051D5;
    --text-color: #1D1D1F;
    --text-secondary: #86868B;
    --bg-color: #FFFFFF;
    --bg-secondary: #F5F5F7;
    --border-color: #D2D2D7;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 4px 16px rgba(0, 0, 0, 0.15);
}

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

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

/* Header */
header {
    background-color: var(--bg-color);
    border-bottom: 1px solid var(--border-color);
    padding: 16px 0;
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
    background-color: rgba(255, 255, 255, 0.8);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo svg {
    color: var(--primary-color);
}

.logo h1 {
    font-size: 24px;
    font-weight: 600;
    color: var(--text-color);
}

nav {
    display: flex;
    gap: 24px;
}

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

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

/* Hero Section */
.hero {
    padding: 80px 0;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    text-align: center;
}

.hero-content h2 {
    font-size: 48px;
    font-weight: 700;
    margin-bottom: 16px;
}

.subtitle {
    font-size: 20px;
    opacity: 0.9;
    margin-bottom: 32px;
}

.app-badge {
    margin-top: 32px;
}

.app-store-badge {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    padding: 12px 24px;
    background-color: rgba(255, 255, 255, 0.2);
    border-radius: 12px;
    text-decoration: none;
    color: white;
    font-weight: 600;
    transition: background-color 0.2s;
}

.app-store-badge:hover {
    background-color: rgba(255, 255, 255, 0.3);
}

.app-store-badge img {
    height: 40px;
}

/* Features Section */
.features {
    padding: 80px 0;
    background-color: var(--bg-secondary);
}

.features h2 {
    text-align: center;
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 48px;
    color: var(--text-color);
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 32px;
}

.feature-card {
    background-color: var(--bg-color);
    padding: 32px;
    border-radius: 16px;
    box-shadow: var(--shadow);
    transition: transform 0.2s, box-shadow 0.2s;
}

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

.feature-icon {
    font-size: 48px;
    margin-bottom: 16px;
}

.feature-card h3 {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-color);
}

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

/* Privacy Section */
.privacy {
    padding: 80px 0;
    background-color: var(--bg-color);
}

.privacy h2 {
    text-align: center;
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 48px;
    color: var(--text-color);
}

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

.privacy-content h3 {
    font-size: 24px;
    font-weight: 600;
    margin-top: 32px;
    margin-bottom: 16px;
    color: var(--text-color);
}

.privacy-content p {
    margin-bottom: 16px;
    color: var(--text-secondary);
    line-height: 1.8;
}

.privacy-content ul {
    margin-left: 24px;
    margin-bottom: 16px;
    color: var(--text-secondary);
}

.privacy-content li {
    margin-bottom: 8px;
    line-height: 1.8;
}

.privacy-content strong {
    color: var(--text-color);
}

/* Footer */
footer {
    background-color: var(--bg-secondary);
    padding: 32px 0;
    text-align: center;
    border-top: 1px solid var(--border-color);
}

footer p {
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.attribution {
    font-size: 14px;
}

.attribution a {
    color: var(--text-secondary);
    text-decoration: none;
}

.attribution a:hover {
    color: var(--primary-color);
    text-decoration: underline;
}

/* Responsive */
@media (max-width: 768px) {
    .hero-content h2 {
        font-size: 32px;
    }
    
    .subtitle {
        font-size: 18px;
    }
    
    nav {
        gap: 16px;
    }
    
    nav a {
        font-size: 14px;
    }
    
    .features h2,
    .privacy h2 {
        font-size: 28px;
    }
    
    .feature-grid {
        grid-template-columns: 1fr;
    }
}