:root {
    --nav-bg: #0f1220;
    --nav-card: #171b2e;
    --nav-line: #252b45;
    --nav-primary: #4f7cff;
    --nav-primary2: #8b5cf6;
    --nav-text: #e9ecf8;
    --nav-muted: #8e96b8;
    --nav-radius: 16px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    margin: 0;
    font-family: "Microsoft YaHei", "PingFang SC", "Helvetica Neue", Arial, sans-serif;
    background: var(--nav-bg);
    color: var(--nav-text);
    line-height: 1.65;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
.container { width: min(1180px, 92vw); margin: 0 auto; }

.nav-header { position: sticky; top: 0; z-index: 50; background: rgba(15, 18, 32, .88); border-bottom: 1px solid var(--nav-line); backdrop-filter: blur(12px); }
.nav-header-inner { display: flex; align-items: center; min-height: 68px; gap: 24px; }
.nav-logo { display: inline-flex; align-items: center; gap: 10px; font-size: 21px; font-weight: 900; }
.nav-logo-mark { display: inline-flex; align-items: center; justify-content: center; width: 36px; height: 36px; border-radius: 10px; background: linear-gradient(135deg, var(--nav-primary), var(--nav-primary2)); color: #fff; font-size: 19px; }
.nav-menu { display: flex; align-items: center; gap: 4px; flex: 1; justify-content: flex-end; }
.nav-menu a { padding: 9px 14px; border-radius: 8px; color: #c3c9e6; font-weight: 700; font-size: 15px; }
.nav-menu a:hover { color: #fff; background: rgba(79, 124, 255, .18); }
.nav-toggle { display: none; border: 0; background: var(--nav-primary); color: #fff; border-radius: 8px; padding: 8px 11px; font-size: 18px; cursor: pointer; }

.nav-main { min-height: 70vh; }
.nav-hero { padding: 56px 0 32px; background: radial-gradient(circle at 20% 0%, rgba(79,124,255,.28), transparent 45%), radial-gradient(circle at 80% 10%, rgba(139,92,246,.25), transparent 42%); }
.nav-hero-box { text-align: center; }
.nav-hero-box h1 { margin: 0 0 12px; font-size: 38px; letter-spacing: 1px; }
.nav-hero-box p { margin: 0 0 24px; color: var(--nav-muted); font-size: 16px; }
.nav-search { display: flex; width: min(620px, 92vw); margin: 0 auto; border: 1px solid var(--nav-line); border-radius: 999px; overflow: hidden; background: #11152a; }
.nav-search input { border: 0; outline: 0; flex: 1; padding: 13px 18px; background: transparent; color: #fff; }
.nav-search button { border: 0; padding: 0 28px; background: linear-gradient(135deg, var(--nav-primary), var(--nav-primary2)); color: #fff; font-weight: 800; cursor: pointer; }
.nav-hot-tags { display: flex; justify-content: center; flex-wrap: wrap; gap: 9px; margin-top: 20px; }
.nav-hot-tags a { padding: 6px 13px; border: 1px solid var(--nav-line); border-radius: 999px; color: #b9c1e2; font-size: 13px; }
.nav-hot-tags a:hover { border-color: var(--nav-primary); color: #fff; }

.nav-categories, .nav-sites { padding: 26px 0 40px; }
.nav-section-title h2 { margin: 0 0 18px; font-size: 23px; display: flex; align-items: center; gap: 9px; }
.nav-section-title h2::before { content: ''; width: 5px; height: 21px; border-radius: 99px; background: linear-gradient(var(--nav-primary), var(--nav-primary2)); }
.nav-category-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.nav-category-card { background: var(--nav-card); border: 1px solid var(--nav-line); border-radius: var(--nav-radius); padding: 20px 16px; text-align: center; transition: transform .2s, border-color .2s; }
.nav-category-card:hover { transform: translateY(-4px); border-color: var(--nav-primary); }
.nav-category-icon { display: block; font-size: 26px; color: var(--nav-primary); margin-bottom: 8px; }
.nav-category-card b { display: block; font-size: 16px; }
.nav-category-card small { color: var(--nav-muted); }

.nav-site-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.nav-site-card { background: var(--nav-card); border: 1px solid var(--nav-line); border-radius: var(--nav-radius); overflow: hidden; transition: transform .2s, border-color .2s; }
.nav-site-card:hover { transform: translateY(-4px); border-color: var(--nav-primary); }
.nav-site-img { aspect-ratio: 16/10; overflow: hidden; background: #11152a; }
.nav-site-img img { width: 100%; height: 100%; object-fit: cover; }
.nav-site-mark { display: flex; align-items: center; justify-content: center; font-size: 32px; font-weight: 900; color: #fff; background: linear-gradient(135deg, var(--nav-primary), var(--nav-primary2)); }
.nav-site-info { padding: 13px 15px; }
.nav-site-info h3 { margin: 0 0 7px; font-size: 16px; line-height: 1.45; display: -webkit-box; -webkit-line-clamp: 1; -webkit-box-orient: vertical; overflow: hidden; }
.nav-site-info p { color: var(--nav-muted); font-size: 13px; margin: 0 0 9px; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.nav-site-info span { color: #6f7aa8; font-size: 12px; }

.nav-page-title { background: radial-gradient(circle at 20% 0%, rgba(79,124,255,.25), transparent 50%), #0c0f1d; padding: 38px 0; border-bottom: 1px solid var(--nav-line); }
.nav-page-title h1 { margin: 0 0 6px; font-size: 30px; }
.nav-page-title p { margin: 0; color: var(--nav-muted); }
.nav-page-layout { display: grid; grid-template-columns: 1fr 270px; gap: 22px; padding: 26px 0 44px; }
.nav-page-main { min-width: 0; }
.nav-page-side { position: sticky; top: 86px; align-self: start; }
.nav-side-card { background: var(--nav-card); border: 1px solid var(--nav-line); border-radius: var(--nav-radius); padding: 18px; }
.nav-side-card h3 { margin: 0 0 12px; font-size: 18px; }
.nav-side-nav { display: flex; flex-direction: column; gap: 2px; }
.nav-side-nav a { padding: 9px 10px; border-radius: 8px; color: #c3c9e6; font-weight: 700; }
.nav-side-nav a:hover { background: rgba(79,124,255,.18); color: #fff; }

.nav-article { background: var(--nav-card); border: 1px solid var(--nav-line); border-radius: var(--nav-radius); padding: 30px 36px 36px; margin: 26px auto 46px; }
.nav-article-head { border-bottom: 1px solid var(--nav-line); padding-bottom: 18px; margin-bottom: 22px; }
.nav-article-head h1 { margin: 0 0 12px; font-size: 31px; line-height: 1.4; }
.nav-meta { display: flex; flex-wrap: wrap; gap: 16px; color: var(--nav-muted); font-size: 13px; }
.nav-article-content { font-size: 16px; line-height: 1.9; }
.nav-article-content h2, .nav-article-content h3 { margin-top: 1.4em; }
.nav-article-content img { max-width: 100%; height: auto; border-radius: 8px; margin: 12px 0; }
.nav-article-content p { margin: 0 0 16px; }
.nav-article-pager { display: flex; justify-content: space-between; gap: 16px; margin-top: 24px; padding-top: 16px; border-top: 1px solid var(--nav-line); font-size: 14px; }
.nav-article-pager a { color: var(--nav-primary); font-weight: 700; }
.nav-related { margin-top: 24px; }
.nav-related h2 { font-size: 22px; }
.nav-empty { padding: 45px 0; text-align: center; color: var(--nav-muted); }
.pager { display: flex; justify-content: center; gap: 8px; margin-top: 22px; flex-wrap: wrap; }
.pager a, .pager span { min-width: 36px; height: 36px; display: inline-flex; align-items: center; justify-content: center; padding: 0 10px; border: 1px solid var(--nav-line); border-radius: 8px; background: var(--nav-card); color: #c3c9e6; font-weight: 700; }
.pager a:hover { border-color: var(--nav-primary); color: #fff; }
.pager .current { background: var(--nav-primary); border-color: var(--nav-primary); color: #fff; }

.nav-footer { background: #0b0e19; border-top: 1px solid var(--nav-line); padding: 28px 0; text-align: center; color: var(--nav-muted); margin-top: 20px; }
.nav-footer-links { display: flex; justify-content: center; flex-wrap: wrap; gap: 14px; margin-bottom: 12px; }
.nav-footer-links a { color: #b9c1e2; }
.nav-footer-links a:hover { color: #fff; }
.nav-footer p { margin: 0; font-size: 13px; }
.stat-code { text-align: center; margin-top: 6px; }

@media (max-width: 960px) {
    .nav-category-grid, .nav-site-grid { grid-template-columns: repeat(2, 1fr); }
    .nav-page-layout { grid-template-columns: 1fr; }
    .nav-page-side { position: static; }
}

@media (max-width: 640px) {
    .nav-header-inner { flex-wrap: wrap; gap: 10px; padding: 12px 0; }
    .nav-toggle { display: inline-flex; }
    .nav-menu { display: none; order: 3; flex-basis: 100%; flex-direction: column; align-items: stretch; background: #0f1220; border-top: 1px solid var(--nav-line); padding: 8px 0; }
    .nav-menu.open { display: flex; }
    .nav-hero-box h1 { font-size: 28px; }
    .nav-category-grid, .nav-site-grid { grid-template-columns: 1fr; }
    .nav-article { padding: 20px 18px; }
    .nav-article-head h1 { font-size: 25px; }
}