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

body {
    font-family: 'Arial', sans-serif;
    background-color: #f5f5f5;
    color: #8B4513;
}

.phone-container {
    position: relative;
    width: 100%;
    max-width: 414px;
    height: 100vh;
    margin: 0 auto;
    background: url('../images/background.jpg') center/cover no-repeat;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.content-wrapper {
    position: relative;
    width: 100%;
    height: 100%;
    padding: 20px;
    overflow-y: auto;
}

.back-button {
    position: absolute;
    top: 20px;
    left: 20px;
    width: 70px;
    height: 70px;
    border-radius: 50%;
    background-color: #FFF8F0;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-decoration: none;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    z-index: 10;
}

.back-button span {
    color: #8B4513;
    font-size: 14px;
    line-height: 1.2;
}

.content-page {
    background-color: rgba(255, 248, 240, 0.9);
    padding: 20px;
    border-radius: 15px;
    margin-top: 80px;
}

.content-page h2 {
    margin-bottom: 20px;
    text-align: center;
}

.model-list, .function-list {
    padding-left: 20px;
    margin-bottom: 15px;
}

.model-list li, .function-list li {
    margin-bottom: 10px;
}