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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: #1a1a1a;
    background: #fff;
}

.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Navigation */
nav {
    background: #fff;
    border-bottom: 1px solid #e0e0e0;
    position: sticky;
    top: 0;
    z-index: 100;
}

nav .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 20px;
}

.brand {
    font-size: 1.25rem;
    font-weight: 600;
    color: #1a1a1a;
}

.nav-links {
    display: flex;
    gap: 1.5rem;
    align-items: center;
}

.nav-links a {
    color: #666;
    text-decoration: none;
    font-weight: 500;
}

.nav-links a:hover {
    color: #007aff;
}

.btn-app {
    background: #007aff;
    color: white !important;
    padding: 0.5rem 1rem;
    border-radius: 8px;
}

/* Hero */
.hero {
    padding: 80px 0;
    text-align: center;
    background: linear-gradient(180deg, #f8f9fa 0%, #fff 100%);
}

.hero h1 {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: #1a1a1a;
}

.hero p {
    font-size: 1.25rem;
    color: #666;
    margin-bottom: 2rem;
}

.btn-primary {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 28px;
    background: #007aff;
    color: white;
    text-decoration: none;
    border-radius: 10px;
    font-weight: 600;
    font-size: 1rem;
}

.btn-primary:hover {
    background: #0051d5;
}

/* Features */
.features {
    padding: 60px 0;
}

.features h2 {
    font-size: 2rem;
    margin-bottom: 2rem;
    text-align: center;
}

.feature-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.feature {
    padding: 1.5rem;
    border: 1px solid #e0e0e0;
    border-radius: 10px;
}

.feature strong {
    display: block;
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
    color: #1a1a1a;
}

.feature p {
    color: #666;
    font-size: 0.95rem;
}

.features h3 {
    font-size: 1.5rem;
    margin: 3rem 0 1.5rem;
    text-align: center;
}

.sizes {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.sizes > div {
    padding: 1.5rem;
    background: #f8f9fa;
    border-radius: 10px;
}

.sizes strong {
    display: block;
    font-size: 1.1rem;
    margin-bottom: 1rem;
}

.sizes ul {
    list-style: none;
}

.sizes li {
    padding: 0.5rem 0;
    color: #666;
    border-bottom: 1px solid #e0e0e0;
}

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

/* How it works */
.how {
    padding: 60px 0;
    background: #f8f9fa;
}

.how h2 {
    font-size: 2rem;
    margin-bottom: 2rem;
    text-align: center;
}

.how ol {
    max-width: 500px;
    margin: 0 auto;
    counter-reset: step-counter;
    list-style: none;
}

.how li {
    counter-increment: step-counter;
    padding: 1rem 0 1rem 3rem;
    position: relative;
    font-size: 1.1rem;
}

.how li::before {
    content: counter(step-counter);
    position: absolute;
    left: 0;
    top: 0.8rem;
    width: 32px;
    height: 32px;
    background: #007aff;
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
}

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

.cta h2 {
    font-size: 2rem;
    margin-bottom: 2rem;
}

.cta .btn-primary {
    background: white;
    color: #667eea;
}

.cta .btn-primary:hover {
    background: #f0f0f0;
}

/* Footer */
footer {
    padding: 40px 0;
    background: #1a1a1a;
    color: #fff;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    margin-bottom: 2rem;
}

.footer-content strong {
    display: block;
    margin-bottom: 0.5rem;
}

.footer-content p {
    color: #999;
    font-size: 0.9rem;
}

.footer-content a {
    color: #999;
    text-decoration: none;
    display: block;
    margin: 0.5rem 0;
}

.footer-content a:hover {
    color: #fff;
}

.copyright {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid #333;
    color: #666;
    font-size: 0.9rem;
}

/* Mobile */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 2rem;
    }
    
    .hero p {
        font-size: 1rem;
    }
    
    .nav-links {
        gap: 1rem;
    }
    
    .feature-list {
        grid-template-columns: 1fr;
    }
    
    .sizes {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        flex-direction: column;
        gap: 2rem;
    }
}