/*
 * 官网公共导航样式。
 * 页面不要再各自维护 .pill-nav；栏目与交互统一由 site-navigation.js 提供。
 */
html {
    /* 无论页面内容是否需要纵向滚动，都保留对称滚动条槽位，避免跨页横向位移。 */
    scrollbar-gutter: stable both-edges;
}

.pill-nav.site-nav {
    --site-nav-accent: var(--sky-deep, var(--sky-bottom, var(--blue, #2B7FD8)));
    /* 导航是跨页面定位基准，首帧必须直接稳定显示，禁止位置入场动画。 */
    position: fixed;
    left: 50vw;
    bottom: 24px;
    z-index: 1000;
    display: flex;
    width: max-content;
    max-width: calc(100vw - 32px);
    gap: 4px;
    padding: 5px;
    overflow-x: auto;
    overscroll-behavior-inline: contain;
    border: 1px solid rgba(255, 255, 255, 0.68);
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.93);
    box-shadow: 0 10px 36px rgba(30, 91, 168, 0.35);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    scrollbar-width: none;
    opacity: 1;
    transform: translateX(-50%);
    -webkit-overflow-scrolling: touch;
}

.pill-nav.site-nav::-webkit-scrollbar {
    display: none;
}

.pill-nav.site-nav .site-nav__link {
    flex: 0 0 auto;
    display: inline-flex;
    align-items: center;
    gap: 5px;
    padding: 9px 16px;
    border: 0;
    border-radius: 999px;
    color: #4A4A5A;
    background: transparent;
    font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
    font-size: 13px;
    font-weight: 500;
    line-height: 1.2;
    text-decoration: none;
    white-space: nowrap;
    transition: color 0.25s ease, background 0.25s ease, box-shadow 0.25s ease;
}

.pill-nav.site-nav .site-nav__link:hover,
.pill-nav.site-nav .site-nav__link:focus-visible {
    color: var(--site-nav-accent);
    background: rgba(43, 127, 216, 0.08);
    outline: none;
}

.pill-nav.site-nav .site-nav__link.active {
    color: #fff;
    background: var(--site-nav-accent);
    box-shadow: 0 4px 14px rgba(43, 127, 216, 0.4);
}

.pill-nav.site-nav .pill-num {
    margin: 0;
    color: #8A9ABA;
    font-family: Consolas, "SFMono-Regular", "Fira Code", monospace;
    font-size: 10px;
    line-height: 1;
    opacity: 1;
}

.pill-nav.site-nav .site-nav__link.active .pill-num {
    color: rgba(255, 255, 255, 0.75);
}

@media (max-width: 768px) {
    .pill-nav.site-nav {
        bottom: 72px;
    }
}

@media (max-width: 480px) {
    .pill-nav.site-nav {
        bottom: 70px;
    }

    .pill-nav.site-nav .site-nav__link {
        padding: 8px 13px;
        font-size: 12px;
    }
}

@media (prefers-reduced-motion: reduce) {
    .pill-nav.site-nav .site-nav__link {
        transition: none;
    }
}