h1, h2 {
    color: #333;
}

.model-container {
    display: flex;
    flex-wrap: wrap;
  /*  gap: 20px;*/
    list-style-type: none;
    padding-left: 0;
}

.model-item {
    flex: 1 1 200px;
    margin-bottom: 10px;
}

.notes {
    background-color: #f9f9f9;
    padding: 20px;
    border-left: 4px solid #007BFF;
    margin-top: 20px;
}

.note-item {
    margin-bottom: 15px;
}
body {
    font-family: 'Helvetica', sans-serif;
    line-height: 1.7;
    margin: 25px;
    max-width: 1600px;
    margin-left: auto;
    margin-right: auto;
    background-color: #f9f9f9;
}

h1, h2, h3 {
    color: #222;
}

h2 {
    border-bottom: 3px solid #444;
    padding-bottom: 8px;
    margin-top: 30px;
}

h3 {
    color: #2c3e50;
    margin-top: 25px;
}

ul {
    margin: 15px 0;
    padding-left: 25px;
}

li {
    margin-bottom: 12px;
}

.section {
    margin-bottom: 35px;
    padding: 15px;
    background: #fff;
    border-radius: 5px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.tip {
    background-color: #e8f4f8;
    padding: 12px;
    border-left: 5px solid #3498db;
    margin-bottom: 25px;
    border-radius: 4px;
}