* {
    box-sizing: border-box;
}

body {
    font-family: 'PingFang SC', 'Microsoft YaHei', sans-serif;
    background-color: #f5f5f5;
    margin: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    min-height: 100vh;
    width: 100%;
    overflow-x: hidden;
}

nav {
    background-color: #fff;
    width: 100%;
    padding: 14px 16px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 10px 12px;
    position: sticky;
    top: 0;
    z-index: 1000;
}

nav::-webkit-scrollbar {
    display: none;
}

nav a {
    text-decoration: none;
    color: #333;
    font-weight: bold;
    transition: color 0.3s;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 8px 14px;
    border-radius: 999px;
    white-space: nowrap;
}

nav a:hover {
    color: #fe2c55;
}

nav a.active {
    color: #fe2c55;
    background-color: #fff1f4;
}

.header,
.page-header {
    width: 100%;
    text-align: center;
}

.header {
    padding: 36px 20px 20px;
}

.header h1 {
    margin: 0;
    color: #333;
    font-size: 2.5em;
}

.page-header {
    padding: 36px 20px 8px;
}

.page-header h1 {
    margin: 0;
}

@media (max-width: 768px) {
    nav {
        justify-content: flex-start;
        flex-wrap: nowrap;
        gap: 8px;
        padding: 10px 8px;
        overflow-x: auto;
        overflow-y: hidden;
        scrollbar-width: none;
        -ms-overflow-style: none;
    }

    nav a {
        flex: 0 0 auto;
        font-size: 0.9em;
        padding: 7px 10px;
    }

    .header {
        padding: 28px 16px 18px;
    }

    .header h1 {
        font-size: 2em;
    }

    .page-header {
        padding: 28px 16px 16px;
    }
}