* {
    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: #333;
}

/* Header */
header {
    background: #fff;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 2rem;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.logo img {
    width: 32px;
    height: 32px;
}

.logo h1 {
    font-size: 1.5rem;
    font-weight: 700;
    color: #1da1f2;
}

nav ul {
    display: flex;
    list-style: none;
    gap: 2rem;
}

nav a {
    text-decoration: none;
    color: #333;
    font-weight: 500;
    transition: color 0.3s;
}

nav a:hover {
    color: #1da1f2;
}

/* Main */
main {
    margin-top: 80px;
}

/* Hero Section */
.hero {
    display: flex;
    align-items: center;
    min-height: 80vh;
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
    gap: 4rem;
}

.hero-content {
    flex: 1;
}

.hero-content h1 {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: #1a202c;
}

.hero-content p {
    font-size: 1.25rem;
    color: #4a5568;
    margin-bottom: 2rem;
}

.cta-button {
    display: inline-block;
    background: #1da1f2;
    color: white;
    padding: 1rem 2rem;
    font-size: 1.1rem;
    font-weight: 600;
    text-decoration: none;
    border-radius: 8px;
    transition: background 0.3s;
}

.cta-button:hover {
    background: #0d8bd9;
}

.hero-image {
    flex: 1;
    text-align: center;
}

.hero-image img {
    max-width: 300px;
    width: 100%;
    height: auto;
}

/* Features */
.features {
    background: #f8fafc;
    padding: 4rem 2rem;
}

.features h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    color: #1a202c;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.feature {
    background: white;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
    text-align: center;
}

.feature h3 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
    color: #1a202c;
}

.feature p {
    color: #4a5568;
}

/* How it works */
.how-it-works {
    padding: 4rem 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.how-it-works h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    color: #1a202c;
}

.steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.step {
    text-align: center;
    padding: 2rem 1rem;
}

.step-number {
    display: inline-block;
    width: 60px;
    height: 60px;
    background: #1da1f2;
    color: white;
    border-radius: 50%;
    font-size: 1.5rem;
    font-weight: bold;
    line-height: 60px;
    margin-bottom: 1rem;
}

.step h3 {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
    color: #1a202c;
}

.step p {
    color: #4a5568;
}

/* Use Cases */
.use-cases {
    background: #f8fafc;
    padding: 4rem 2rem;
}

.use-cases h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    color: #1a202c;
}

.use-cases-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.use-case {
    background: white;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
}

.use-case h3 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
    color: #1a202c;
}

.use-case p {
    color: #4a5568;
}

/* Footer */
footer {
    background: #1a202c;
    color: white;
    padding: 2rem;
    text-align: center;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
}

.footer-links {
    margin-top: 1rem;
}

.footer-links a {
    color: #1da1f2;
    text-decoration: none;
    margin: 0 1rem;
}

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

/* Responsive */
@media (max-width: 768px) {
    .hero {
        flex-direction: column;
        text-align: center;
        padding: 1rem;
    }
    
    .hero-content h1 {
        font-size: 2rem;
    }
    
    nav {
        padding: 1rem;
    }
    
    nav ul {
        gap: 1rem;
    }
    
    .features-grid,
    .use-cases-grid {
        grid-template-columns: 1fr;
    }
    
    .steps {
        grid-template-columns: 1fr;
    }
}

/* Privacy Policy & Contact Form */
.privacy-policy,
.contact-form {
    max-width: 800px;
    margin: 0 auto;
    padding: 4rem 2rem;
}

.privacy-policy h2,
.contact-form h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 2rem;
    color: #1a202c;
}

.privacy-policy .last-updated {
    text-align: center;
    color: #666;
    margin-bottom: 3rem;
}

.policy-content h3 {
    font-szie: 1.5rem;
    margin-top: 2rem;
    margin-bottom: 1rem;
    color: #1a202c;
}

.policy-content p,
.policy-content ul {
    margin-bottom: 1.5rem;
    color: #4a5568;
}

.policy-content ul {
    padding-left: 1.5rem;
}

.policy-content a {
    color: #1da1f2;
    text-decoration: none;
}

.policy-content a:hover {
    text-decoration: underline;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: #1a202c;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.8rem;
    border: 1px solid #ccc;
    border-radius: 8px;
    font-size: 1rem;
}

.form-group textarea {
    resize: vertical;
}