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

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: 'Microsoft YaHei', sans-serif;
    line-height: 1.6;
    color: #333;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

a {
    text-decoration: none;
    color: #3273FF;
}

a:hover {
    text-decoration: underline;
}

.nav {
    color: #FEFEFE;
    background: #3273FF;
    padding: 13px 0;
    position: sticky;
    top: 0;
    z-index: 999;
}

.nav > div {
    display: flex;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    align-items: center;
}

.nav-logo {
    display: flex;
    align-items: center;
    flex: 1;
    font-size: 1.25rem;
}

.nav-logo img {
    width: 40px;
    height: 40px;
    margin-right: 5px;
}

.nav-logo a {
    color: #FEFEFE;
    text-decoration: none;
    display: flex;
    align-items: center;
}

.nav-list {
    font-size: 0.95rem;
    flex: 2;
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 1.25rem;
    list-style: none;
    flex-wrap: wrap;
}

.nav-list a {
    color: #FEFEFE;
    transition: opacity .3s ease-in-out;
    text-decoration: none;
}

.nav-list a:hover {
    opacity: 0.85;
    text-decoration: none;
}

.nav-list .login_btn {
    background-color: #FFFFFF;
    color: #3273FF;
    padding: .5rem 1rem;
    border-radius: .25rem;
}

.nav-list .login_btn:hover {
    opacity: 1;
}

.main-content {
    flex: 1;
    max-width: 960px;
    margin: 0 auto;
    padding: 48px 24px 64px;
    width: 100%;
}

.main-content h1 {
    font-size: 2rem;
    color: #202020;
    margin-bottom: 8px;
}

.main-content .subtitle {
    color: #696A6E;
    margin-bottom: 32px;
    font-size: 0.95rem;
}

.main-content h2 {
    font-size: 1.35rem;
    color: #3273FF;
    margin: 36px 0 16px;
    padding-top: 8px;
    border-top: 1px solid #E5E5E5;
}

.main-content h2:first-of-type {
    border-top: none;
    padding-top: 0;
}

.main-content h3 {
    font-size: 1.1rem;
    margin: 20px 0 10px;
    color: #202020;
}

.main-content p,
.main-content li {
    margin-bottom: 12px;
    color: #444;
}

.main-content ul,
.main-content ol {
    padding-left: 24px;
    margin-bottom: 16px;
}

.main-content table {
    width: 100%;
    border-collapse: collapse;
    margin: 16px 0 24px;
    font-size: 0.9rem;
}

.main-content th,
.main-content td {
    border: 1px solid #E5E5E5;
    padding: 10px 12px;
    text-align: left;
    vertical-align: top;
}

.main-content th {
    background: #F8F9FF;
    font-weight: 600;
}

.main-content .en-block {
    background: #F8F9FF;
    border-left: 4px solid #3273FF;
    padding: 12px 16px;
    margin: 12px 0 20px;
    font-size: 0.9rem;
    color: #555;
}

.main-content .highlight-box {
    background: #EFF1FF;
    border-radius: 8px;
    padding: 16px 20px;
    margin: 20px 0;
}

.main-content .copy-block {
    background: #fafafa;
    border: 1px dashed #c0c4cc;
    border-radius: 8px;
    padding: 16px 20px;
    margin: 16px 0;
    font-size: 0.9rem;
    white-space: pre-wrap;
}

.site-footer {
    background: #202020;
    color: #ccc;
    padding: 32px 20px;
    margin-top: auto;
}

.site-footer .footer-inner {
    max-width: 1200px;
    margin: 0 auto;
    text-align: center;
}

.site-footer .footer-links {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 8px 24px;
    margin-bottom: 16px;
}

.site-footer .footer-links a {
    color: #FEFEFE;
    font-size: 0.95rem;
}

.site-footer .footer-links a:hover {
    color: #81B8FF;
}

.site-footer .copyright {
    font-size: 0.85rem;
    color: #999;
}

@media (max-width: 768px) {
    .nav-list {
        gap: 0.75rem;
        font-size: 0.85rem;
    }

    .main-content {
        padding: 32px 16px 48px;
    }

    .main-content table {
        display: block;
        overflow-x: auto;
    }
}