body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    margin: 0;
    padding: 20px;
    color: #333;
    background-color: #fff;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 30px;
    padding: 0 20px;
}

.iframe-container {
    position: relative;
    width: 100%;
    height: 780px;
    margin: 30px 0;
    border: 1px solid #e1e4e8;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
}

iframe {
    width: 100%;
    height: 100%;
    border: none;
}

h1, h2, h3, h4 {
    color: #24292e;
    /*margin-top: 1.5em;*/
    font-weight: 600;
    letter-spacing: -0.01em;
    line-height: 1.3;
}

h1 {
    font-size: 2.75em;
    text-align: center;
    /*margin-bottom: 0.5em;*/
}

h2 {
    font-size: 1.8em;
    /*margin-top: 1.8em;*/
    /*margin-bottom: 0.8em;*/
    /*padding-bottom: 0.3em;*/
    border-bottom: 1px solid #eaecef;
}

h3 {
    font-size: 1.4em;
    margin-top: 1.5em;
    margin-bottom: 0.6em;
}

h4 {
    font-size: 1.2em;
    margin-top: 1.2em;
    margin-bottom: 0.5em;
}

p {
    margin: 0 0 1.2em;
    font-size: 1.05em;
    color: #444;
}

.hero-section {
    text-align: center;
    padding: 20px 0 0px;
    background: linear-gradient(to bottom, #f9f9fa, #ffffff);
    border-radius: 12px;
    margin-top: 20px;
}

.hero-section h1 {
    margin-bottom: 20px;
    background: linear-gradient(120deg, #2c3e50, #4a5c6b);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    color: transparent;
}

.hero-section p {
    font-size: 1.2em;
    max-width: 800px;
    margin: 0 auto 1.5em;
    color: #586069;
}

.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
    /*margin: 40px 0;*/
}

.feature-card {
    padding: 25px;
    background: #f8f9fa;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
    transition: transform 0.2s, box-shadow 0.2s;
    border: 1px solid #eaecef;
}

.feature-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

.feature-card h3 {
    margin-top: 0;
    color: #2c3e50;
    font-size: 1.25em;
}

.feature-card p {
    margin-bottom: 0;
    color: #586069;
}

.toggle-button {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background: #2ea44f;
    color: white;
    padding: 12px 24px;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    box-shadow: 0 2px 8px rgba(0,0,0,0.2);
    z-index: 1000;
    font-weight: 600;
    font-size: 1rem;
    transition: background-color 0.2s;
}

.toggle-button:hover {
    background: #2c974b;
}

.section {
    background-color: #ffffff;
    padding: 30px;
    border-radius: 12px;
    box-shadow: 0 2px 12px rgba(0,0,0,0.03);
    border: 1px solid #f0f0f0;
}

.section-heading {
    text-align: center;
    margin-bottom: 30px;
    position: relative;
}

.section-heading:after {
    content: '';
    display: block;
    width: 60px;
    height: 3px;
    background: linear-gradient(to right, #2c3e50, #4a5c6b);
    margin: 15px auto 0;
    border-radius: 2px;
}

.how-to-list {
    max-width: 700px;
    margin: 0 auto;
}

.how-to-list ol {
    /*padding-left: 1.5em;*/
    counter-reset: item;
}

.how-to-list li {
    /*margin-bottom: 1.5em;*/
    padding-left: 0.5em;
    position: relative;
    counter-increment: item;
}

.how-to-list li:before {
    content: counter(item);
    background: #f0f2f5;
    color: #586069;
    width: 26px;
    height: 26px;
    border-radius: 50%;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    font-size: 0.9em;
    margin-right: 10px;
}

.cta-section {
    background: linear-gradient(135deg, #f6f8fa 0%, #ebf0f5 100%);
    padding: 50px 40px;
    border-radius: 12px;
    text-align: center;
    /*margin: 40px 0;*/
    border: 1px solid #eaecef;
    position: relative;
    overflow: hidden;
}

.cta-section:before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 5px;
    background: linear-gradient(to right, #2c3e50, #4a5c6b);
}

.cta-section h2 {
    margin-top: 0;
    color: #2c3e50;
    border-bottom: none;
}

.cta-button {
    display: inline-block;
    background: linear-gradient(to right, #2c3e50, #4a5c6b);
    color: white;
    font-weight: 600;
    padding: 14px 28px;
    border-radius: 6px;
    text-decoration: none;
    margin-top: 20px;
    transition: all 0.2s;
    border: none;
    box-shadow: 0 3px 8px rgba(0,0,0,0.15);
}

.cta-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.2);
}

.testimonials {
    margin: 60px 0;
}

.testimonial-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-top: 40px;
}

.testimonial-card {
    background-color: #fff;
    border-radius: 8px;
    padding: 25px;
    box-shadow: 0 3px 10px rgba(0,0,0,0.05);
    border: 1px solid #eaecef;
    position: relative;
}

.testimonial-card:before {
    content: '"';
    font-size: 5em;
    position: absolute;
    top: -15px;
    left: 10px;
    color: #f0f2f5;
    font-family: Georgia, serif;
    z-index: 0;
}

.testimonial-text {
    position: relative;
    z-index: 1;
    font-style: italic;
    color: #586069;
    margin-bottom: 20px;
    line-height: 1.7;
}

.testimonial-author {
    display: flex;
    align-items: center;
    margin-top: 15px;
}

.author-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: #e1e4e8;
    margin-right: 10px;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    color: #586069;
}

.author-info {
    display: flex;
    flex-direction: column;
}

.author-name {
    font-weight: 600;
    color: #24292e;
}

.author-role {
    font-size: 0.9em;
    color: #6a737d;
}

.faq-section {
    margin: 60px 0;
}

.faq-item {
    margin-bottom: 20px;
    border: 1px solid #eaecef;
    border-radius: 8px;
    overflow: hidden;
}

.faq-question {
    padding: 18px 20px;
    background-color: #f6f8fa;
    cursor: pointer;
    font-weight: 600;
    color: #24292e;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.faq-question:after {
    content: '+';
    font-size: 1.2em;
    color: #586069;
}

.faq-answer {
    padding: 0 20px;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease-out, padding 0.3s ease;
}

.faq-item.active .faq-question:after {
    content: '−';
}

.faq-item.active .faq-answer {
    padding: 20px;
    max-height: 500px;
}

footer {
    text-align: center;
    padding: 30px 0;
    color: #6a737d;
    border-top: 1px solid #eaecef;
}

footer p {
    font-size: 0.9em;
    margin-bottom: 10px;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-top: 20px;
}

.footer-links a {
    color: #586069;
    text-decoration: none;
    transition: color 0.2s;
}

.footer-links a:hover {
    color: #0366d6;
}

@media (max-width: 768px) {
    body {
        padding: 15px;
    }

    .container {
        padding: 0 10px;
    }

    h1 {
        font-size: 2.2em;
    }

    h2 {
        font-size: 1.6em;
    }

    .hero-section p {
        font-size: 1.1em;
    }

    .iframe-container {
        height: 500px;
        margin: 20px 0;
    }

    .features {
        gap: 20px;
    }

    .feature-card {
        padding: 20px;
    }

    .toggle-button {
        bottom: 15px;
        right: 15px;
        padding: 10px 20px;
        font-size: 0.9rem;
    }

    .cta-section {
        padding: 30px 20px;
    }

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

@media (max-width: 480px) {
    h1 {
        font-size: 1.8em;
    }

    .iframe-container {
        height: 400px;
    }

    .hero-section p {
        font-size: 1em;
    }

    .feature-card {
        padding: 15px;
    }

    .section {
        padding: 20px;
    }
}

h1 {
    font-size: 2.75em;
    text-align: center;
    /*margin-bottom: 0.5em;*/
    background: linear-gradient(120deg, #2c3e50, #4a5c6b, #718096);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    color: transparent;
    font-weight: 700;
    letter-spacing: -0.02em;
    padding: 0.2em 0;
    position: relative;
    z-index: 1;
    text-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

h1:after {
    content: '';
    position: absolute;
    width: 80px;
    height: 3px;
    background: linear-gradient(to right, #2c3e50, #4a5c6b);
    bottom: -5px;
    left: 50%;
    transform: translateX(-50%);
    border-radius: 2px;
}