:root {
    --primary: #000000;
    --secondary: #007AFF;
    --accent: #007AFF;
    --background: #FFFFFF;
    --text-main: #000000;
    --text-muted: #666666;
    --white: #FFFFFF;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

body {
    background-color: var(--background);
    color: var(--text-main);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* Header */
header {
    padding: 1rem 0;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    position: sticky;
    top: 0;
    z-index: 100;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.75rem;
    font-weight: 800;
    color: var(--primary);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    letter-spacing: -0.04em;
}

.logo img {
    height: 48px;
}

.logo span {
    color: var(--secondary);
}

/* Hero Section */
.hero {
    padding: 8rem 0;
    text-align: center;
    background: var(--primary);
    color: var(--white);
}

.hero h1 {
    font-size: 4rem;
    font-weight: 800;
    margin-bottom: 1.5rem;
    line-height: 1.1;
    letter-spacing: -0.04em;
}

.hero p {
    font-size: 1.25rem;
    color: rgba(255, 255, 255, 0.7);
    max-width: 600px;
    margin: 0 auto 3rem;
    font-weight: 400;
}

.download-buttons {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    flex-wrap: wrap;
}

.btn-store {
    transition: opacity 0.2s;
}

.btn-store:hover {
    opacity: 0.8;
}

.btn-store img {
    height: 44px;
}

/* Features */
.features {
    padding: 8rem 0;
}

.section-title {
    text-align: center;
    margin-bottom: 4rem;
}

.section-title h2 {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--primary);
    letter-spacing: -0.03em;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 3rem;
}

.feature-card {
    padding: 0;
    transition: none;
}

.feature-icon {
    width: 3.5rem;
    height: 3.5rem;
    background: #F2F2F7;
    color: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 1rem;
    margin-bottom: 1.5rem;
    font-size: 1.5rem;
}

.feature-card h3 {
    margin-bottom: 0.75rem;
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.02em;
}

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

/* FAQ */
.faq {
    padding: 8rem 0;
    background: #FAFAFA;
}

.faq-item {
    background: var(--white);
    margin-bottom: 1rem;
    border-radius: 1.25rem;
    padding: 2rem;
    border: 1px solid #E5E5E5;
}

.faq-item h4 {
    color: var(--primary);
    margin-bottom: 0.75rem;
    font-size: 1.25rem;
    font-weight: 700;
}

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

/* Footer */
footer {
    padding: 6rem 0 3rem;
    background: var(--primary);
    color: var(--white);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 4rem;
    margin-bottom: 4rem;
}

.footer-info p {
    color: rgba(255, 255, 255, 0.5);
    margin-top: 1rem;
}

.footer-links h5 {
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: 1.5rem;
    color: rgba(255, 255, 255, 0.4);
}

.footer-links ul {
    list-style: none;
}

.footer-links li {
    margin-bottom: 1rem;
}

.footer-links a {
    color: var(--white);
    text-decoration: none;
    font-weight: 500;
    opacity: 0.7;
    transition: opacity 0.2s;
}

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

.copyright {
    text-align: left;
    padding-top: 3rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.3);
    font-size: 0.875rem;
}

/* Legal Content */
.legal-content {
    padding: 6rem 0;
    max-width: 700px;
}

.legal-content h1 {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: 1rem;
    letter-spacing: -0.04em;
}

.legal-content p.last-updated {
    color: var(--text-muted);
    margin-bottom: 3rem;
}

.legal-content h2 {
    margin: 3rem 0 1.5rem;
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.legal-content p, .legal-content li {
    color: var(--text-main);
    margin-bottom: 1.25rem;
    font-size: 1.1rem;
}

.legal-content ul {
    padding-left: 1.5rem;
    margin-bottom: 2rem;
}

/* Responsive */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 3rem;
    }
    .hero {
        padding: 6rem 0;
    }
    .features, .faq {
        padding: 5rem 0;
    }
}