/* ==========================================================================
   鱼仔论坛 CMS · 门户蓝（default 主题）
   配色：主蓝 #1c7ed6 / 深蓝 #1864ab / 文本 #212529 / 次文本 #6c757d / 边框 #e9ecef
   结构：顶栏 → 品牌搜索条 → 主导航 → 推荐位 → 两栏主体（列表 + 侧栏）→ 页脚
   断点：1080 收窄 / 900 导航与栏宽 / 768 抽屉导航 / 520 单栏正文 / 380 极窄
   自定义主题可整体替换本文件。
   ========================================================================== */

:root {
    --yz-primary: #1c7ed6;
    --yz-primary-dark: #1864ab;
    --yz-danger: #e03131;
    --yz-text: #212529;
    --yz-text-weak: #6c757d;
    --yz-border: #e9ecef;
    --yz-bg: #f5f7fa;
    --yz-card: #ffffff;
    --yz-radius: 6px;
    --yz-shadow: 0 1px 3px rgba(0, 0, 0, .06);
    --yz-max: 1180px;
    color-scheme: light;
}

* { box-sizing: border-box; }

html {
    -webkit-text-size-adjust: 100%;
    scroll-padding-top: 16px;
}

body {
    margin: 0;
    background: var(--yz-bg);
    color: var(--yz-text);
    font: 14px/1.7 "Microsoft YaHei", "PingFang SC", "Helvetica Neue", Arial, sans-serif;
}

a { color: var(--yz-text); text-decoration: none; -webkit-tap-highlight-color: transparent; }
a:hover { color: var(--yz-primary); }
img { max-width: 100%; }

/* ---------------- 品牌与搜索 ---------------- */
/* 与导航条同样不再通栏：白底放在内层，宽度对齐下方内容列 */
.yz-header { max-width: var(--yz-max); margin: 0 auto; padding: 0 16px; }
.yz-header-inner {
    /* 顶边品牌色细带 + 上浅下白淡蓝渐变，替代纯白让页头有层次但不与下方蓝条抢色 */
    background:
        linear-gradient(90deg, var(--yz-primary-dark), var(--yz-primary) 45%, #40c057) top / 100% 3px no-repeat,
        linear-gradient(180deg, #f4f9ff, var(--yz-card) 65%);
    border-bottom: 1px solid var(--yz-border);
    padding: 18px 0;
    display: flex; align-items: center; gap: 24px;
}
.yz-logo { display: flex; align-items: center; gap: 12px; min-width: 0; }
.yz-logo-mark {
    width: 44px; height: 44px; border-radius: 8px; flex: none;
    background: var(--yz-primary); color: #fff;
    font-size: 22px; font-weight: 700;
    display: flex; align-items: center; justify-content: center;
}
.yz-logo-text { display: flex; flex-direction: column; min-width: 0; }
.yz-logo-img { display: block; }
.yz-logo-text strong { font-size: 20px; line-height: 1.3; }
.yz-logo-text small { color: var(--yz-text-weak); font-size: 12px; }

/* 右侧留白：卡片内边距为 0，搜索框不额外留距时会贴到页面右缘 */
.yz-search { margin-left: auto; margin-right: 16px; display: flex; width: 360px; max-width: 40vw; }
.yz-search input {
    flex: 1; min-width: 0; height: 38px; padding: 0 12px;
    border: 2px solid var(--yz-primary); border-right: 0;
    border-radius: var(--yz-radius) 0 0 var(--yz-radius);
    outline: none; font-size: 16px;
}
.yz-search button {
    height: 38px; padding: 0 20px; border: 0; cursor: pointer;
    background: var(--yz-primary); color: #fff;
    border-radius: 0 var(--yz-radius) var(--yz-radius) 0;
    font-size: 14px;
}
.yz-search button:hover { background: var(--yz-primary-dark); }

/* ---------------- 主导航 ---------------- */
/* 不再通栏：背景放在内层，宽度与下方 .yz-container 的内容列对齐 */
.yz-nav { position: relative; max-width: var(--yz-max); margin: 0 auto; padding: 0 16px; }
.yz-nav-inner {
    background: var(--yz-primary);
    display: flex; align-items: stretch; flex-wrap: wrap;
}
.yz-nav-group { position: relative; display: flex; }
.yz-nav-item {
    display: block; padding: 12px 20px; color: #e7f5ff; font-size: 15px;
}
.yz-nav-item em { font-style: normal; font-size: 12px; opacity: .7; margin-left: 2px; }
.yz-nav-item:hover, .yz-nav-item.is-active { background: var(--yz-primary-dark); color: #fff; }
.yz-nav-drop {
    display: none; position: absolute; top: 100%; left: 0; z-index: 30;
    min-width: 170px; padding: 6px 0;
    background: #fff; border: 1px solid var(--yz-border);
    box-shadow: var(--yz-shadow); border-radius: 0 0 var(--yz-radius) var(--yz-radius);
}
.yz-nav-drop a { display: block; padding: 7px 16px; font-size: 13px; white-space: nowrap; }
.yz-nav-drop a:hover { background: #e7f5ff; color: var(--yz-primary-dark); }
.yz-nav-group:hover .yz-nav-drop { display: block; }
/* 触屏无 hover：下拉面板改为跟随当前分类展开 */
@media (hover: none) {
    .yz-nav-group:hover .yz-nav-drop { display: none; }
}
@supports selector(:has(*)) {
    .yz-nav-group:has(.yz-nav-item.is-active) .yz-nav-drop { display: block; }
}
/* 抽屉内的二级分类：桌面隐藏，窄屏改为父项下方的展开块 */
.yz-nav-sub { display: none; }
/* 汉堡按钮只在抽屉断点出现 */
.yz-nav-toggle { display: none; }

/* 关闭 JS 时不收起导航，退回整条平铺 */
.no-js .yz-nav-toggle { display: none !important; }
.no-js .yz-nav-inner {
    display: flex; flex-wrap: wrap;
    position: static; visibility: visible; opacity: 1; transform: none;
    max-height: none; overflow: visible; padding: 0; border-radius: 0; box-shadow: none;
}
.no-js .yz-nav-sub { display: none; }

/* ---------------- 容器 ---------------- */
.yz-container { max-width: var(--yz-max); margin: 0 auto; padding: 18px 16px 40px; }

/* ---------------- 推荐位 ---------------- */
.yz-feature {
    display: grid; grid-template-columns: 2fr 1fr; gap: 16px;
    background: var(--yz-card); border: 1px solid var(--yz-border);
    border-radius: var(--yz-radius); padding: 16px; margin-bottom: 18px;
}
.yz-feature-main { display: flex; gap: 16px; min-width: 0; }
.yz-feature-main img {
    width: 260px; height: 160px; object-fit: cover; border-radius: var(--yz-radius);
}
.yz-feature-noimg {
    width: 260px; height: 160px; flex: none;
    display: flex; align-items: center; justify-content: center;
    background: linear-gradient(135deg, var(--yz-primary), #74c0fc);
    color: #fff; font-size: 52px; font-weight: 700; border-radius: var(--yz-radius);
}
.yz-feature-text { display: flex; flex-direction: column; justify-content: center; gap: 8px; min-width: 0; }
.yz-feature-text strong { font-size: 20px; line-height: 1.5; }
.yz-feature-text span { color: var(--yz-text-weak); }
.yz-feature-text em { font-style: normal; font-size: 12px; color: #adb5bd; }
.yz-feature-main:hover strong { color: var(--yz-primary); }

.yz-feature-side { list-style: none; margin: 0; padding: 0; border-left: 1px solid var(--yz-border); padding-left: 16px; }
.yz-feature-side li { display: flex; justify-content: space-between; gap: 8px; padding: 9px 0; border-bottom: 1px dashed var(--yz-border); }
.yz-feature-side a { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.yz-feature-side time { color: #adb5bd; font-size: 12px; flex: none; }
/* 置顶标记：标题前的红色竖线 */
.yz-tag-top {
    display: inline-block; width: 2px; height: 13px; flex: none;
    border-radius: 1px; background: var(--yz-danger);
    margin-right: 7px; vertical-align: middle;
}

/* ---------------- 两栏 ---------------- */
.yz-columns { display: grid; grid-template-columns: minmax(0, 1fr) 300px; gap: 18px; align-items: start; }

.yz-panel-head {
    display: flex; align-items: baseline; gap: 12px;
    background: var(--yz-card); border: 1px solid var(--yz-border);
    border-left: 4px solid var(--yz-primary);
    border-radius: var(--yz-radius); padding: 10px 16px; margin-bottom: 14px;
}
.yz-panel-head h2 { margin: 0; font-size: 17px; }
.yz-panel-count { color: var(--yz-text-weak); font-size: 12px; }
.yz-note, .yz-empty {
    background: #fff9db; border: 1px solid #ffe066; color: #b08900;
    padding: 10px 14px; border-radius: var(--yz-radius);
}
.yz-empty { background: var(--yz-card); border-color: var(--yz-border); color: var(--yz-text-weak); }

/* ---------------- 帖子列表 ---------------- */
.yz-list { list-style: none; margin: 0; padding: 0; }
.yz-item {
    display: flex; gap: 14px; padding: 16px;
    background: var(--yz-card); border: 1px solid var(--yz-border);
    border-radius: var(--yz-radius); margin-bottom: 12px;
    transition: box-shadow .15s ease;
}
.yz-item:hover { box-shadow: 0 3px 10px rgba(0, 0, 0, .08); }
.yz-item-thumb { flex: none; width: 150px; height: 96px; overflow: hidden; border-radius: 4px; background: #f1f3f5; }
.yz-item-thumb img { width: 100%; height: 100%; object-fit: cover; display: block; }
.yz-item-letter {
    display: flex; align-items: center; justify-content: center; width: 100%; height: 100%;
    background: linear-gradient(135deg, #4dabf7, #a5d8ff); color: #fff; font-size: 34px; font-weight: 700;
}
.yz-item-body { min-width: 0; flex: 1; }
.yz-item-body h3 { margin: 0 0 6px; font-size: 17px; line-height: 1.5; }
.yz-item-desc {
    margin: 0 0 8px; color: var(--yz-text-weak); font-size: 13px;
    display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
}
.yz-item-meta { display: flex; flex-wrap: wrap; gap: 12px; font-size: 12px; color: #adb5bd; }
.yz-chip {
    background: #e7f5ff; color: var(--yz-primary-dark);
    padding: 1px 8px; border-radius: 10px; font-size: 12px;
}
.yz-tag { color: var(--yz-primary); }

/* ---------------- 分页 ---------------- */
.yz-pagination { display: flex; flex-wrap: wrap; gap: 6px; justify-content: center; margin: 22px 0 4px; }
.yz-page, .yz-page-nav, .yz-page-gap {
    min-width: 34px; padding: 6px 10px; text-align: center;
    background: var(--yz-card); border: 1px solid var(--yz-border); border-radius: 4px; font-size: 13px;
}
.yz-page:hover, .yz-page-nav:hover { border-color: var(--yz-primary); color: var(--yz-primary); }
.yz-page.is-current { background: var(--yz-primary); border-color: var(--yz-primary); color: #fff; }
.yz-page-gap { border: 0; background: none; }

/* ---------------- 侧栏 ---------------- */
.yz-side { display: flex; flex-direction: column; gap: 14px; position: sticky; top: 14px; }
.yz-card { background: var(--yz-card); border: 1px solid var(--yz-border); border-radius: var(--yz-radius); padding: 14px 16px; }
.yz-card-title {
    margin: 0 0 10px; font-size: 15px; padding-bottom: 8px;
    border-bottom: 2px solid var(--yz-primary);
}
.yz-rank { list-style: none; counter-reset: yzrank; margin: 0; padding: 0; }
.yz-rank li { counter-increment: yzrank; display: flex; gap: 8px; padding: 7px 0; border-bottom: 1px dashed var(--yz-border); }
.yz-rank li:last-child { border-bottom: 0; }
.yz-rank li::before {
    content: counter(yzrank); flex: none; width: 18px; height: 18px; margin-top: 3px;
    background: #dee2e6; color: #495057; font-size: 12px; border-radius: 3px;
    display: flex; align-items: center; justify-content: center;
}
.yz-rank li:nth-child(-n+3)::before { background: var(--yz-primary); color: #fff; }
.yz-rank a { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-size: 13px; }
.yz-rank-meta { color: #adb5bd; font-size: 12px; flex: none; }
/* 推荐阅读：只留标题，前面一根竖杠代替序号 */
.yz-plain { list-style: none; margin: 0; padding: 0; }
.yz-plain li { display: flex; align-items: baseline; gap: 7px; padding: 6px 0; font-size: 13px; }
.yz-plain li::before { content: '\007C'; flex: none; color: #ced4da; font-weight: 600; }
.yz-plain a { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.yz-reply-feed { list-style: none; margin: 0; padding: 0; }
.yz-reply-feed li { padding: 8px 0; border-bottom: 1px dashed var(--yz-border); font-size: 13px; }
.yz-reply-feed li:last-child { border-bottom: 0; }
.yz-reply-feed strong { color: var(--yz-primary-dark); margin-right: 4px; }
.yz-reply-feed span { display: block; color: var(--yz-text-weak); }
.yz-reply-feed a { display: block; font-size: 12px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.yz-reply-feed time { color: #adb5bd; font-size: 11px; }
.yz-none { color: #adb5bd; }
.yz-tags { display: flex; flex-wrap: wrap; gap: 7px; }
.yz-tags a {
    background: #f1f3f5; border-radius: 12px; padding: 2px 10px; font-size: 12px; color: #495057;
}
.yz-tags a:hover { background: var(--yz-primary); color: #fff; }
.yz-tags em { font-style: normal; opacity: .6; margin-left: 4px; }

/* ---------------- 详情页 ---------------- */
.yz-crumb { color: var(--yz-text-weak); font-size: 13px; margin-bottom: 10px; }
.yz-crumb a { color: var(--yz-text-weak); }
.yz-article { background: var(--yz-card); border: 1px solid var(--yz-border); border-radius: var(--yz-radius); padding: 22px 24px; }
.yz-article-title { margin: 0 0 10px; font-size: 24px; line-height: 1.45; overflow-wrap: anywhere; }
.yz-article-meta {
    display: flex; flex-wrap: wrap; gap: 14px; font-size: 12px; color: var(--yz-text-weak);
    padding-bottom: 14px; border-bottom: 1px solid var(--yz-border); margin-bottom: 18px;
}
.yz-article-body { font-size: 15px; line-height: 1.85; overflow-wrap: break-word; min-height: 720px; }
.yz-article-body p { margin: 0 0 14px; }
.yz-article-body img, .yz-article-body video, .yz-article-body iframe { max-width: 100%; height: auto; }
.yz-article-body img { border-radius: 4px; margin: 6px 0; }
.yz-article-body iframe { display: block; }
.yz-article-body pre {
    background: #1e2430; color: #e9ecef; padding: 14px 16px; margin: 0 0 14px;
    overflow: auto; -webkit-overflow-scrolling: touch;
    border-radius: var(--yz-radius); font-size: 13px; line-height: 1.6;
}
.yz-article-body code { font-family: Consolas, Monaco, monospace; overflow-wrap: anywhere; }
.yz-article-body :not(pre) > code { background: #f1f3f5; color: #c92a2a; padding: 1px 5px; border-radius: 3px; }
.yz-article-body blockquote {
    margin: 0 0 14px; padding: 10px 16px; background: #f8f9fa;
    border-left: 4px solid var(--yz-primary); color: var(--yz-text-weak);
}
.yz-article-body table { width: 100%; border-collapse: collapse; margin: 0 0 14px; font-size: 13px; }
.yz-article-body th, .yz-article-body td { border: 1px solid var(--yz-border); padding: 8px 10px; }
.yz-article-body th { background: #f8f9fa; }

.yz-attach { margin-top: 22px; padding-top: 14px; border-top: 1px dashed var(--yz-border); }
.yz-attach h4 { margin: 0 0 10px; font-size: 15px; }
.yz-attach table { width: 100%; border-collapse: collapse; font-size: 13px; }
.yz-attach th, .yz-attach td { border: 1px solid var(--yz-border); padding: 8px 10px; text-align: left; }
.yz-attach th { background: #f8f9fa; font-weight: 600; }
.yz-attach a { color: var(--yz-primary); }
.yz-missing { color: var(--yz-danger); }

/* 上下篇：整块可点的卡片，标题允许两行，比原来的一行小字更显眼 */
.yz-neighbor { display: flex; gap: 14px; margin: 20px 0 20px; }
.yz-neighbor-item {
    flex: 1 1 0; min-width: 0;
    display: flex; flex-direction: column; align-items: flex-start; gap: 6px;
    padding: 14px 18px;
    background: linear-gradient(135deg, #ffffff 0%, #eef5fb 100%);
    border: 1px solid var(--yz-border);
    border-radius: var(--yz-radius); box-shadow: var(--yz-shadow);
    color: inherit; text-decoration: none;
    transition: border-color .18s, box-shadow .18s, transform .18s;
}
.yz-neighbor-item:hover, .yz-neighbor-item:focus-visible {
    background: linear-gradient(135deg, #f6fbfe 0%, #e2eff9 100%);
    border-color: var(--yz-primary);
    box-shadow: 0 3px 12px rgba(28, 126, 214, .16);
    transform: translateY(-1px);
}
.yz-neighbor-item:hover .yz-neighbor-title,
.yz-neighbor-item:focus-visible .yz-neighbor-title { color: var(--yz-primary); }
.yz-neighbor-next { align-items: flex-end; text-align: right; }
.yz-neighbor-tip {
    display: flex; align-items: center; gap: 6px;
    font-size: 14px; color: var(--yz-text-weak);
}
.yz-neighbor-tip::before { content: '\2039'; font-size: 19px; line-height: .8; color: var(--yz-primary); }
.yz-neighbor-next .yz-neighbor-tip::before { content: none; }
.yz-neighbor-next .yz-neighbor-tip::after { content: '\203A'; font-size: 19px; line-height: .8; color: var(--yz-primary); }
.yz-neighbor-title {
    font-size: 15px; font-weight: 600; line-height: 1.5; color: var(--yz-text);
    display: -webkit-box; -webkit-box-orient: vertical; -webkit-line-clamp: 2;
    line-clamp: 2; overflow: hidden; overflow-wrap: anywhere;
}
/* 占位：保持另一侧的左右位置，桌面端不可见，堆叠时不占高度 */
.yz-neighbor-empty { visibility: hidden; }

.yz-replies, .yz-related {
    background: var(--yz-card); border: 1px solid var(--yz-border);
    border-radius: var(--yz-radius); padding: 18px 24px; margin-top: 16px;
}
.yz-replies h3, .yz-related h3 { margin: 0 0 12px; font-size: 17px; padding-left: 10px; border-left: 4px solid var(--yz-primary); }
.yz-reply { padding: 14px 0; border-bottom: 1px solid var(--yz-border); }
.yz-reply:last-child { border-bottom: 0; }
.yz-reply-head { display: flex; align-items: center; flex-wrap: wrap; gap: 8px 12px; font-size: 12px; color: var(--yz-text-weak); margin-bottom: 8px; }
.yz-floor { background: #e7f5ff; color: var(--yz-primary-dark); padding: 1px 8px; border-radius: 10px; }
.yz-reply-head strong { color: var(--yz-text); font-size: 13px; }
.yz-reply-body { font-size: 14px; line-height: 1.8; overflow-wrap: break-word; }
.yz-reply-body p { margin: 0 0 10px; }
.yz-reply-body img { max-width: 100%; height: auto; max-height: 420px; border-radius: 4px; }
.yz-reply-attach { margin-top: 8px; font-size: 12px; }
.yz-reply-attach a { color: var(--yz-primary); margin-right: 14px; }
.yz-related ul { list-style: none; margin: 0; padding: 0; }
.yz-related li { display: flex; justify-content: space-between; gap: 12px; padding: 7px 0; border-bottom: 1px dashed var(--yz-border); }
.yz-related li:last-child { border-bottom: 0; }
.yz-related time { color: #adb5bd; font-size: 12px; flex: none; }

/* ---------------- 404 ---------------- */
.yz-404 { background: var(--yz-card); border: 1px solid var(--yz-border); border-radius: var(--yz-radius); padding: 60px 24px; text-align: center; }
.yz-404 h1 { font-size: 64px; margin: 0; color: var(--yz-primary); }
.yz-404-hot { margin-top: 24px; text-align: left; }
.yz-btn {
    display: inline-block; margin-top: 10px; padding: 8px 22px;
    background: var(--yz-primary); color: #fff; border-radius: var(--yz-radius);
}
.yz-btn:hover { background: var(--yz-primary-dark); color: #fff; }

/* ---------------- 预览提示条 ---------------- */
.yz-preview-bar {
    max-width: var(--yz-max); margin: 12px auto 0; padding: 8px 16px;
    background: #fff3bf; border: 1px solid #ffd43b; border-radius: var(--yz-radius);
    color: #997404; font-size: 13px;
}

/* ---------------- 页脚 ---------------- */
/* 与页面同底色，只用一条细分隔线收尾 */
.yz-footer {
    background: var(--yz-bg); color: var(--yz-text-weak);
    margin-top: 24px; border-top: 1px solid var(--yz-border); font-size: 13px;
}
.yz-footer-bottom {
    max-width: var(--yz-max); margin: 0 auto; padding: 18px 16px; text-align: center;
    color: var(--yz-text-weak); font-size: 14px; line-height: 1.7;
}
.yz-footer-tech { margin-top: 4px; }

/* ==========================================================================
   响应式
   ========================================================================== */

/* 正文里的老文章可能带固定宽度，超出部分裁掉而不是撑出横向滚动 */
.yz-container { overflow-x: clip; }

/* 1080 起逐步收窄左右留白，避免大屏挤成一坨、小屏又过窄 */
@media (max-width: 1080px) {
    .yz-header, .yz-nav, .yz-container, .yz-footer-bottom, .yz-preview-bar {
        padding-left: 12px; padding-right: 12px;
    }
    .yz-nav-item { padding: 12px 16px; }
    .yz-search { width: 320px; }
}

/* 900：平板横屏/小笔记本。侧栏变窄，导航缩字号继续平铺，推荐位改成上图下文 */
@media (max-width: 900px) {
    .yz-columns { grid-template-columns: minmax(0, 1fr) 250px; gap: 14px; }
    .yz-nav-item { padding: 11px 12px; font-size: 14px; }
    .yz-header-inner { gap: 16px; }
    .yz-feature { grid-template-columns: minmax(0, 1fr); }
    .yz-feature-main { flex-direction: column; gap: 12px; }
    .yz-feature-main img, .yz-feature-noimg { width: 100%; height: auto; aspect-ratio: 16 / 9; }
    .yz-feature-text span {
        display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
    }
    .yz-feature-side { border-left: 0; padding-left: 0; border-top: 1px solid var(--yz-border); padding-top: 8px; }
}

/* 768 以下：两栏改单栏，主导航变成汉堡按钮 + 下拉开合 */
@media (max-width: 768.98px) {
    /* 单列也要 minmax(0,…)，否则侧栏里不换行的标题会把轨道撑出容器 */
    .yz-columns { grid-template-columns: minmax(0, 1fr); }
    .yz-side { position: static; }

    .yz-header-inner { flex-wrap: wrap; gap: 12px; padding: 12px 0; }
    .yz-logo { flex: 1 1 auto; }
    .yz-logo-img { height: 34px !important; max-width: 210px !important; }
    .yz-logo-text strong { font-size: 17px; }
    .yz-logo-text small { display: none; }
    .yz-search { order: 3; width: 100%; max-width: none; margin-left: 0; margin-right: 0; }

    /* 蓝条只留汉堡按钮，菜单向下展开盖住内容 */
    .yz-nav { padding: 0 12px; }
    html.js .yz-nav { min-height: 46px; }
    .yz-nav-inner {
        position: absolute; top: 100%; left: 12px; right: 12px; z-index: 50;
        display: block; flex: none; max-height: 72vh; overflow-y: auto;
        -webkit-overflow-scrolling: touch; overscroll-behavior: contain;
        padding: 6px 0 8px; border-radius: 0 0 var(--yz-radius) var(--yz-radius);
        box-shadow: 0 10px 24px rgba(0, 0, 0, .18);
        visibility: hidden; opacity: 0; transform: translateY(-10px);
        transition: opacity .18s ease, transform .18s ease, visibility 0s .18s;
    }
    .yz-nav.is-open .yz-nav-inner {
        visibility: visible; opacity: 1; transform: none;
        transition: opacity .18s ease, transform .18s ease, visibility 0s 0s;
    }
    .yz-nav-toggle {
        display: flex; align-items: center; gap: 8px;
        width: 100%; height: 46px; padding: 0 14px; margin: 0;
        background: var(--yz-primary); border: 0; border-radius: var(--yz-radius); cursor: pointer;
        color: #e7f5ff; font-size: 15px; font-family: inherit;
    }
    .yz-nav-toggle:hover, .yz-nav.is-open .yz-nav-toggle { background: var(--yz-primary-dark); color: #fff; }
    .yz-nav-toggle-icon { position: relative; display: block; flex: none; width: 20px; height: 2px; background: currentColor; }
    .yz-nav-toggle-icon::before, .yz-nav-toggle-icon::after {
        content: ""; position: absolute; left: 0; width: 20px; height: 2px;
        background: currentColor; transition: transform .18s ease;
    }
    .yz-nav-toggle-icon::before { top: -6px; }
    .yz-nav-toggle-icon::after { top: 6px; }
    .yz-nav.is-open .yz-nav-toggle-icon { background: transparent; }
    .yz-nav.is-open .yz-nav-toggle-icon::before { transform: translateY(6px) rotate(45deg); }
    .yz-nav.is-open .yz-nav-toggle-icon::after { transform: translateY(-6px) rotate(-45deg); }
    .yz-nav-item { padding: 13px 14px; font-size: 16px; border-top: 1px solid rgba(255, 255, 255, .14); }
    .yz-nav-item em { display: none; }
    .yz-nav-group { display: block; position: static; }
    .yz-nav-drop { display: none !important; }
    .yz-nav-sub {
        display: block; position: static; min-width: 0; padding: 0;
        background: none; border: 0; box-shadow: none; border-radius: 0;
    }
    .yz-nav-sub a {
        display: block; padding: 10px 14px 10px 28px; font-size: 14px;
        color: #a5d8ff; white-space: normal; border-top: 1px solid rgba(255, 255, 255, .08);
    }
    .yz-nav-sub a::before { content: "└"; color: rgba(255, 255, 255, .45); margin-right: 8px; }
    .yz-nav-sub a:hover { background: none; color: #fff; }
    .yz-nav-sub em { font-style: normal; font-size: 12px; opacity: .6; margin-left: 2px; }

    /* 正文与附件表格改为卡片内横向滚动，避免撑破布局 */
    .yz-article-body table, .yz-attach table {
        display: block; max-width: 100%; overflow-x: auto; -webkit-overflow-scrolling: touch;
    }
    .yz-attach th, .yz-attach td { white-space: nowrap; }

    /* 触屏不留 hover 阴影 */
    .yz-item:hover { box-shadow: none; }

    /* 手机端正文与可点元素放大，便于拇指点按 */
    .yz-article-body { font-size: 16px; }
    .yz-reply-body { font-size: 15px; }
    .yz-tags a { padding: 4px 12px; }
    .yz-btn { padding: 10px 22px; }
}

/* 无 JS 时菜单无法开合，窄屏退回平铺 */
@media (max-width: 768.98px) {
    .no-js .yz-nav-sub { display: block; }
    .no-js .yz-nav-sub a { border-top: 1px solid rgba(255, 255, 255, .14); color: #a5d8ff; }
}

/* 520：手机主流宽度以下，正文与卡片进一步收边 */
@media (max-width: 520px) {
    body { font-size: 15px; }
    .yz-container { padding: 14px 12px 30px; }
    .yz-footer-bottom { padding: 16px 12px; }
    .yz-article, .yz-replies, .yz-related { padding: 16px 14px; }
    .yz-article-title { font-size: 21px; }
    .yz-404 { padding: 44px 16px; }
    .yz-404 h1 { font-size: 48px; }
    .yz-item { padding: 14px; }
    .yz-panel-head { padding: 10px 14px; }
    .yz-reply-body img { max-height: 280px; }
}

/* 480：窄屏手机。顶图按视口高度限制，列表缩略图收成小方块 */
@media (max-width: 480px) {
    .yz-feature-main img, .yz-feature-noimg { max-height: 46vh; object-fit: cover; }
    .yz-feature-noimg { font-size: 40px; }
    .yz-feature-text strong { font-size: 17px; }
    .yz-item { gap: 12px; }
    .yz-item-thumb { width: 104px; height: 78px; }
    .yz-item-letter { font-size: 26px; }
    .yz-item-body h3 { font-size: 16px; }
    .yz-neighbor { flex-direction: column; gap: 10px; margin-top: 16px; }
    .yz-neighbor-item { padding: 12px 14px; }
    .yz-neighbor-next { align-items: flex-start; text-align: left; }
    .yz-neighbor-next .yz-neighbor-tip::before { content: '\2039'; }
    .yz-neighbor-next .yz-neighbor-tip::after { content: none; }
    .yz-neighbor-empty { display: none; }
    .yz-search button { padding: 0 14px; }
}

/* 380：老款小屏，标题与分页换行优先 */
@media (max-width: 380px) {
    .yz-logo-img { height: 28px !important; max-width: 170px !important; }
    .yz-nav-toggle { font-size: 14px; }
    .yz-nav-item { font-size: 15px; }
    .yz-item { gap: 10px; }
    .yz-item-thumb { width: 96px; height: 72px; }
    .yz-article-title { font-size: 19px; }
    .yz-article-body { font-size: 15px; }
    .yz-page, .yz-page-nav, .yz-page-gap { min-width: 30px; padding: 6px 7px; }
}

/* ---------- 首页广告位：未配置时 theme_ad() 不输出节点，这里只负责配置后的排版 ---------- */
.ad-slot { margin: 0 0 18px; text-align: center; }
/* 边框画在图片上而不是 .ad-slot 容器上：容器总是比图宽，画在容器上会露出一段空白边 */
.ad-slot img {
    display: block; max-width: 100%; height: auto; margin: 0 auto;
    border: 1px solid #cfe1f3; border-radius: var(--yz-radius);
}
.ad-slot-top img { max-width: min(1440px, 100%); }
.ad-slot-content img { max-width: min(1035px, 100%); }
.ad-slot-side img { max-width: min(375px, 100%); }
/* 侧栏本身用 gap 控制间距，广告位不再额外留白 */
.yz-side .ad-slot { margin: 0; }

@media (max-width: 640px) {
    .ad-slot-top { display: none; }
}