body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    max-width: 900px;
    margin: 0 auto;
    padding: 20px;
    background-color: #f5f5f5;
    line-height: 1.6;
}

.header {
    text-align: center;
    margin-bottom: 40px;
    background: white;
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.header h1 {
    color: #333;
    margin-bottom: 10px;
}

.content {
    background: white;
    padding: 30px;
    border-radius: 10px;
    margin-bottom: 30px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.content h2 {
    color: #007cba;
    border-bottom: 2px solid #007cba;
    padding-bottom: 10px;
    margin-bottom: 20px;
}

.image-container {
    text-align: center;
    margin: 30px 0;
    padding: 20px;
    background: #f9f9f9;
    border-radius: 8px;
}

.image-container img {
    max-width: 100%;
    height: auto;
    border: 2px solid #ddd;
    border-radius: 8px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
}

.navigation {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: white;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.nav-btn {
    padding: 12px 24px;
    background: #007cba;
    color: white;
    text-decoration: none;
    border-radius: 6px;
    font-weight: bold;
    transition: background 0.3s;
}

.nav-btn:hover {
    background: #005a87;
}

.nav-btn.disabled {
    background: #ccc;
    pointer-events: none;
    cursor: not-allowed;
}

.page-info {
    font-weight: bold;
    color: #666;
    font-size: 18px;
}

.step-number {
    background: #007cba;
    color: white;
    padding: 5px 15px;
    border-radius: 20px;
    display: inline-block;
    margin-bottom: 15px;
}