body {
    font-family: 'Arial', '微软雅黑', sans-serif;
    line-height: 1.6;
    margin: 0;
    padding: 0;
    background-color: #f4f4f4;
    color: #333;
}

header {
    background-color: #2c3e50;
    color: white;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 50px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.logo img {
    height: 50px;
}

nav a {
    color: white;
    text-decoration: none;
    margin: 0 15px;
    transition: color 0.3s;
}

nav a:hover {
    color: #3498db;
}

.btn-register {
    background-color: #3498db;
    color: white;
    padding: 10px 20px;
    border-radius: 5px;
    transition: background-color 0.3s;
}

.btn-register:hover {
    background-color: #2980b9;
}

.btn-register-large {
    display: inline-block;
    background-color: #e74c3c;
    color: white;
    padding: 15px 30px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: bold;
    transition: background-color 0.3s;
    margin-top: 15px;
}

.btn-register-large:hover {
    background-color: #c0392b;
}

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

section {
    background-color: white;
    margin-bottom: 20px;
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

.price-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.logo-section {
    display: flex;
    align-items: center;
    float: left;
}

.eth-logo {
    width: 60px;
    margin-right: 15px;
    float: left;
}

.price-details {
    display: flex;
    justify-content: space-between;
}

.price-box, .price-stats {
    width: 48%;
}

.chart-controls {
    display: flex;
    justify-content: center;
    margin-bottom: 15px;
}

.chart-btn {
    margin: 0 10px;
    padding: 8px 15px;
    background-color: #f1f1f1;
    border: 1px solid #ddd;
    border-radius: 5px;
    cursor: pointer;
    transition: all 0.3s;
    outline: none;
}

.chart-btn:hover {
    background-color: #e0e0e0;
}

.chart-btn.active {
    background-color: #3498db;
    color: white;
    border-color: #3498db;
}

.eth-description ul {
    list-style-type: none;
    padding: 0;
}

.eth-description li {
    margin-bottom: 10px;
    padding-left: 25px;
    position: relative;
}

.eth-description li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 5px;
    width: 15px;
    height: 15px;
    background-size: contain;
    background-repeat: no-repeat;
}

table {
    width: 100%;
    border-collapse: collapse;
}

table th, table td {
    border: 1px solid #ddd;
    padding: 12px;
    text-align: left;
}

details {
    margin-bottom: 15px;
    padding: 10px;
    background-color: #f9f9f9;
    border-radius: 5px;
}

footer {
    background-color: #2c3e50;
    color: white;
    text-align: center;
    padding: 15px;
}

@media screen and (max-width: 768px) {
    header {
        flex-direction: column;
        text-align: center;
    }

    .price-details, .price-header {
        flex-direction: column;
    }

    .price-box, .price-stats {
        width: 100%;
        margin-bottom: 15px;
    }

    .chart-controls {
        flex-direction: column;
    }

    .chart-btn {
        margin: 5px 0;
    }
}