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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: #000;
    background: #fff;
}

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

/* Header */
header {
    background: #fff;
    border-bottom: 2px solid #000;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.logo h1 {
    color: #000;
    font-size: 24px;
    font-weight: 700;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 30px;
}

.nav-menu a {
    text-decoration: none;
    color: #000;
    font-weight: 500;
    transition: all 0.3s;
}

.nav-menu a:hover {
    background: #000;
    color: #fff;
    padding: 8px 16px;
    border-radius: 4px;
}

/* Main content */
main {
    margin-top: 70px;
}

/* Hero section */
.hero {
    background: #000;
    color: #fff;
    padding: 100px 0;
    text-align: center;
}

.hero h1 {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 20px;
}

.hero-subtitle {
    font-size: 1.25rem;
    margin-bottom: 40px;
    opacity: 0.8;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.hero-buttons {
    display: flex;
    gap: 20px;
    justify-content: center;
    flex-wrap: wrap;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 12px 30px;
    text-decoration: none;
    border-radius: 8px;
    font-weight: 600;
    transition: all 0.3s;
    border: 2px solid transparent;
}

.btn-primary {
    background: #fff;
    color: #000;
}

.btn-primary:hover {
    background: #000;
    color: #fff;
    border-color: #fff;
}

.btn-secondary {
    background: transparent;
    color: #fff;
    border-color: #fff;
}

.btn-secondary:hover {
    background: #fff;
    color: #000;
}

/* Features section */
.features {
    padding: 100px 0;
    background: #fff;
}

.features h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 60px;
    color: #000;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
}

.feature {
    background: #fff;
    padding: 40px;
    border: 2px solid #000;
    border-radius: 8px;
    transition: all 0.3s;
}

.feature:hover {
    background: #000;
    color: #fff;
}

.feature h3 {
    font-size: 1.5rem;
    margin-bottom: 15px;
    color: #000;
}

.feature:hover h3 {
    color: #fff;
}

.feature p {
    color: #000;
}

.feature:hover p {
    color: #fff;
}

/* How it works section */
.how-it-works {
    padding: 100px 0;
    background: #000;
    color: #fff;
}

.how-it-works h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 60px;
    color: #fff;
}

.steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
}

.step {
    text-align: center;
    padding: 40px 20px;
}

.step-number {
    width: 60px;
    height: 60px;
    background: #fff;
    color: #000;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    font-weight: 700;
    margin: 0 auto 20px;
}

.step h3 {
    font-size: 1.5rem;
    margin-bottom: 15px;
    color: #fff;
}

.step p {
    color: #fff;
    opacity: 0.8;
}

/* API section */
.api-section {
    padding: 100px 0;
    background: #fff;
}

.api-section h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 30px;
    color: #000;
}

.api-section p {
    text-align: center;
    font-size: 1.1rem;
    margin-bottom: 40px;
    color: #000;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.api-links {
    display: flex;
    gap: 20px;
    justify-content: center;
    margin-bottom: 60px;
    flex-wrap: wrap;
}

.api-section h3 {
    font-size: 1.8rem;
    margin-bottom: 20px;
    color: #000;
    text-align: center;
}

.tech-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 10px;
    max-width: 600px;
    margin: 0 auto;
    list-style: none;
}

.tech-list li {
    background: #fff;
    padding: 15px 20px;
    border: 1px solid #000;
    border-radius: 4px;
    text-align: center;
    font-weight: 500;
    color: #000;
    transition: all 0.3s;
}

.tech-list li:hover {
    background: #000;
    color: #fff;
}

/* Footer */
footer {
    background: #000;
    color: #fff;
    text-align: center;
    padding: 40px 0;
    border-top: 2px solid #fff;
}

footer p {
    opacity: 0.8;
}

/* Responsive design */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 2.5rem;
    }
    
    .hero-subtitle {
        font-size: 1.1rem;
    }
    
    .features h2,
    .how-it-works h2,
    .api-section h2 {
        font-size: 2rem;
    }
    
    .nav-menu {
        gap: 20px;
    }
    
    .hero-buttons {
        gap: 15px;
    }
}