:root {
    --primary-color: #2563eb;
    --secondary-color: #1e40af;
    --text-color: #1f2937;
    --light-bg: #f3f4f6;
    --white: #ffffff;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
}

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

.hero {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--white);
    padding: 60px 0;
    text-align: center;
}

.hero h1 {
    font-size: 2.5rem;
    margin-bottom: 20px;
    font-weight: 700;
}

.hero p {
    font-size: 1.2rem;
    max-width: 800px;
    margin: 0 auto;
    opacity: 0.9;
}

.tool-section {
    max-width: 800px;
    margin: 0 auto;
    padding: 40px 0;
}

.tool-container {
    height: 400px;
    width: 100%;
    margin: 0 auto;
}

.tool-container iframe {
    width: 100%;
    height: 100%;
    border: none;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    overflow: hidden;
    display: block;
    -webkit-overflow-scrolling: touch;
}

.features {
    background: var(--light-bg);
    padding: 60px 0;
}

.features h2 {
    text-align: center;
    margin-bottom: 40px;
    font-size: 2rem;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    max-width: 1200px;
    margin: 0 auto;
}

.feature-card {
    background: var(--white);
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.feature-card h3 {
    margin-bottom: 15px;
    color: var(--primary-color);
}

.how-to-use {
    padding: 60px 0;
}

.how-to-use h2 {
    text-align: center;
    margin-bottom: 40px;
    font-size: 2rem;
}

.steps {
    max-width: 800px;
    margin: 0 auto;
}

.step {
    margin-bottom: 30px;
    padding: 20px;
    background: var(--white);
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.step h3 {
    color: var(--primary-color);
    margin-bottom: 10px;
}

.use-cases {
    background: var(--light-bg);
    padding: 60px 0;
}

.use-cases h2 {
    text-align: center;
    margin-bottom: 40px;
    font-size: 2rem;
}

.use-cases-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    max-width: 1200px;
    margin: 0 auto;
}

.use-case-card {
    background: var(--white);
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.use-case-card h3 {
    color: var(--primary-color);
    margin-bottom: 15px;
}

footer {
    background: var(--text-color);
    color: var(--white);
    padding: 40px 0;
    text-align: center;
}

@media (max-width: 768px) {
    .hero h1 {
        font-size: 2rem;
        padding: 0 15px;
    }

    .hero p {
        font-size: 1rem;
        padding: 0 15px;
    }

    .tool-container {
        height: 650px;
    }

    .container {
        padding: 0 15px;
    }

    .features h2,
    .how-to-use h2,
    .use-cases h2 {
        font-size: 1.75rem;
    }

    .step,
    .feature-card,
    .use-case-card {
        padding: 20px;
    }
}

@media (max-width: 480px) {
    .hero h1 {
        font-size: 1.75rem;
    }

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

.testimonials {
    padding: 4rem 0;
    background: #f8f9fa;
}

.testimonials h2 {
    text-align: center;
    margin-bottom: 3rem;
    color: var(--primary-color);
}

.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    padding: 1rem;
}

.testimonial-card {
    background: white;
    border-radius: 12px;
    padding: 2rem;
    text-align: center;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease;
}

.testimonial-card:hover {
    transform: translateY(-5px);
}

.testimonial-card .avatar {
    width: 80px;
    height: 80px;
    margin-bottom: 1rem;
}

.testimonial-card h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.testimonial-card p {
    color: #666;
    line-height: 1.6;
    margin-bottom: 1.5rem;
}

.read-more {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
}

.read-more:hover {
    color: var(--primary-color-dark);
}

/* Mobile Responsive */
@media (max-width: 768px) {
    .testimonials-grid {
        grid-template-columns: 1fr;
    }
    
    .testimonial-card {
        padding: 1.5rem;
    }
}

.testimonial-card .avatar {
    width: 80px;
    height: 80px;
    margin-bottom: 1rem;
    border-radius: 50%;
    object-fit: cover;
    background-color: #f5f5f5;
}