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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: #1e1e1e;
    color: #ffffff;
    line-height: 1.6;
}

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

header {
    background: #0078d4;
    padding: 60px 0;
    text-align: center;
}

h1 {
    font-size: 48px;
    font-weight: 300;
    margin-bottom: 10px;
    letter-spacing: 2px;
}

.tagline {
    font-size: 20px;
    font-weight: 300;
    opacity: 0.9;
}

section {
    padding: 80px 0;
}

.hero {
    background: #2d2d2d;
    text-align: center;
}

.hero h2 {
    font-size: 32px;
    font-weight: 300;
    margin-bottom: 30px;
}

.file-conversion {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 40px;
    margin: 40px 0;
    font-size: 24px;
}

.file-type {
    background: #0078d4;
    padding: 30px 50px;
    font-weight: 600;
    letter-spacing: 1px;
}

.arrow {
    font-size: 36px;
    color: #0078d4;
}

.features {
    background: #1e1e1e;
}

.features h2 {
    font-size: 32px;
    font-weight: 300;
    margin-bottom: 50px;
    text-align: center;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.feature-card {
    background: #2d2d2d;
    padding: 40px 30px;
    border-left: 4px solid #0078d4;
}

.feature-card h3 {
    font-size: 22px;
    font-weight: 400;
    margin-bottom: 15px;
    color: #0078d4;
}

.feature-card p {
    font-weight: 300;
    opacity: 0.9;
}

.pricing {
    background: #2d2d2d;
    text-align: center;
}

.pricing h2 {
    font-size: 32px;
    font-weight: 300;
    margin-bottom: 50px;
}

.price-box {
    background: #1e1e1e;
    padding: 60px;
    max-width: 500px;
    margin: 0 auto;
    border: 2px solid #0078d4;
}

.price {
    font-size: 64px;
    font-weight: 300;
    color: #0078d4;
    margin: 20px 0;
}

.price-details {
    font-size: 18px;
    font-weight: 300;
    margin-bottom: 30px;
    opacity: 0.8;
}

.cta-button {
    background: #0078d4;
    color: #ffffff;
    padding: 20px 60px;
    font-size: 18px;
    font-weight: 400;
    border: none;
    cursor: pointer;
    letter-spacing: 1px;
    transition: background 0.3s;
    text-decoration: none;
    display: inline-block;
}

.cta-button:hover {
    background: #005a9e;
}

.cta-button:disabled {
    background: #666;
    cursor: not-allowed;
}

.usage {
    background: #1e1e1e;
}

.usage h2 {
    font-size: 32px;
    font-weight: 300;
    margin-bottom: 30px;
    text-align: center;
}

.code-block {
    background: #0a0a0a;
    padding: 30px;
    font-family: 'Courier New', monospace;
    font-size: 16px;
    color: #00ff00;
    max-width: 700px;
    margin: 0 auto;
    overflow-x: auto;
}

footer {
    background: #0078d4;
    padding: 30px 0;
    text-align: center;
    font-weight: 300;
}

@media (max-width: 768px) {
    h1 {
        font-size: 36px;
    }

    .file-conversion {
        flex-direction: column;
        gap: 20px;
    }

    .features-grid {
        grid-template-columns: 1fr;
    }

    .price-box {
        padding: 40px 20px;
    }
}