/*
Theme Name: YuanCang
Theme URI: https://www.xue-ba.org
Author: YuanCang
Author URI: https://www.xue-ba.org
Description: 轻量、安全的两列博客型 WordPress 主题。
Version: 1.6.2
Requires at least: 5.8
Tested up to: 6.7
Requires PHP: 7.4
License: GNU General Public License v2 or later
License URI: http://www.gnu.org/licenses/gpl-2.0.html
Text Domain: yuancang
Tags: blog, two-columns, right-sidebar, custom-menu, featured-images, threaded-comments, translation-ready
*/

/* ============================================================
   0. 设计变量（改这里就能换整站配色）
   ============================================================ */
:root {
  --yc-primary: #2563eb;
  --yc-primary-dark: #1d4ed8;
  --yc-primary-soft: #eff4ff;
  --yc-price: #f97316;
  --yc-gold: #f5a524;
  --yc-text: #444b57;
  --yc-title: #14161c;
  --yc-muted: #8b93a3;
  --yc-border: #edeff3;
  --yc-border-strong: #dfe3ea;
  --yc-bg: #ffffff;
  --yc-bg-soft: #f7f8fa;
  --yc-dark: #14161c;

  --yc-radius: 12px;
  --yc-radius-sm: 8px;
  --yc-container: 1200px;
  --yc-gutter: 24px;
  --yc-sidebar: 300px;

  --yc-font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --yc-font-num: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;

  --yc-shadow: 0 1px 2px rgba(20, 22, 28, 0.04);
  --yc-shadow-hover: 0 8px 24px rgba(20, 22, 28, 0.08);
}

/* ============================================================
   1. 基础重置（不做激进 reset，避免影响插件元素）
   ============================================================ */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--yc-bg-soft);
  color: var(--yc-text);
  font-family: var(--yc-font);
  font-size: 15px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  word-wrap: break-word;
}

img,
svg,
video,
iframe,
embed,
object {
  max-width: 100%;
  height: auto;
  vertical-align: middle;
}

a {
  color: var(--yc-primary);
  text-decoration: none;
  transition: color 0.18s ease;
}
a:hover {
  color: var(--yc-primary-dark);
}

h1,
h2,
h3,
h4,
h5,
h6 {
  margin: 0 0 0.5em;
  color: var(--yc-title);
  font-weight: 600;
  line-height: 1.35;
}

h1 { font-size: 28px; }
h2 { font-size: 22px; }
h3 { font-size: 18px; }
h4 { font-size: 16px; }
h5,
h6 { font-size: 15px; }

p { margin: 0 0 1em; }

ul,
ol { margin: 0 0 1em; padding-left: 1.4em; }

blockquote {
  margin: 1.4em 0;
  padding: 12px 18px;
  border-left: 3px solid var(--yc-primary);
  background: var(--yc-primary-soft);
  border-radius: 0 var(--yc-radius-sm) var(--yc-radius-sm) 0;
  color: #3a4150;
}

code,
kbd,
pre,
samp {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
  font-size: 13px;
}

code {
  padding: 2px 6px;
  background: #f1f3f7;
  border-radius: 4px;
  color: #c2410c;
}

pre {
  margin: 1.2em 0;
  padding: 16px 18px;
  background: #16181f;
  color: #d7dce5;
  border-radius: var(--yc-radius-sm);
  overflow-x: auto;
  line-height: 1.65;
}
pre code {
  padding: 0;
  background: none;
  color: inherit;
}

table {
  width: 100%;
  margin: 1.2em 0;
  border-collapse: collapse;
  font-size: 14px;
}
th,
td {
  padding: 10px 12px;
  border: 1px solid var(--yc-border);
  text-align: left;
}
th {
  background: var(--yc-bg-soft);
  font-weight: 600;
  color: var(--yc-title);
}

hr {
  height: 1px;
  margin: 28px 0;
  border: 0;
  background: var(--yc-border);
}

/* 无障碍：仅键盘可见的跳转链接 */
.yc-skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 9999;
  padding: 10px 16px;
  background: var(--yc-primary);
  color: #fff;
  border-radius: 0 0 6px 0;
}
.yc-skip-link:focus {
  left: 0;
  color: #fff;
}

.screen-reader-text {
  position: absolute !important;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ============================================================
   2. 布局容器
   ============================================================ */
.yc-container {
  width: 100%;
  max-width: var(--yc-container);
  margin: 0 auto;
  padding: 0 var(--yc-gutter);
}

.yc-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) var(--yc-sidebar);
  gap: 28px;
  align-items: start;
  padding: 28px 0 48px;
}

.yc-layout--full {
  grid-template-columns: minmax(0, 1fr);
}

.yc-layout--left {
  grid-template-columns: var(--yc-sidebar) minmax(0, 1fr);
}
.yc-layout--left .yc-main { order: 2; }
.yc-layout--left .yc-sidebar { order: 1; }

.yc-main {
  min-width: 0;
}

/* ============================================================
   3. 顶部导航
   ============================================================ */
.yc-header {
  background: var(--yc-bg);
  border-bottom: 1px solid var(--yc-border);
  position: relative;
  z-index: 30;
}

.yc-header-inner {
  display: flex;
  align-items: center;
  gap: 16px;
  min-height: 66px;
  /* 头部独立比正文宽：正文 1200 是为了阅读舒适，
     导航 + 搜索 + 按钮塞进同一个宽度会被挤成两行。
     8~9 个中文菜单项已需要 ~700px，加上品牌、搜索、按钮，
     1320 会溢出，所以放宽到 1500（正文宽度不受影响）。 */
  max-width: 1500px;
}

.yc-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
  color: var(--yc-title);
  font-size: 19px;
  font-weight: 700;
  letter-spacing: -0.2px;
}
.yc-brand:hover { color: var(--yc-primary); }

.yc-brand-mark {
  display: grid;
  place-items: center;
  width: 32px;
  height: 32px;
  border-radius: 9px;
  background: var(--yc-primary);
  color: #fff;
  font-size: 15px;
  font-weight: 700;
  font-family: var(--yc-font-num);
}

.yc-brand-logo {
  max-height: 36px;
  width: auto;
}

.yc-brand .custom-logo {
  max-height: 40px;
  width: auto;
  display: block;
}

.yc-brand-text small {
  display: block;
  /* 副标题只做点缀，不能让品牌区无限变宽去挤菜单。
     超长时单行省略号，完整内容在 title 里。 */
  max-width: 160px;
  font-size: 11px;
  font-weight: 400;
  color: var(--yc-muted);
  letter-spacing: 0.4px;
  line-height: 1.2;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* 主菜单 */
.yc-nav {
  flex: 1 1 auto;
  min-width: 0;
}

.yc-nav ul {
  display: flex;
  /* 不换行：菜单折成两行时最后几项会孤零零挂在下面，比字小更难读。
     空间不够时由下方断点收窄间距、隐藏副标题来让位。 */
  flex-wrap: nowrap;
  align-items: center;
  gap: 4px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.yc-nav li {
  position: relative;
}

.yc-nav a {
  display: block;
  padding: 8px 10px;
  border-radius: var(--yc-radius-sm);
  color: #4a5160;
  font-size: 14px;
  font-weight: 500;
  white-space: nowrap;
}
.yc-nav a:hover,
.yc-nav .current-menu-item > a,
.yc-nav .current-menu-ancestor > a,
.yc-nav .current_page_item > a {
  background: var(--yc-primary-soft);
  color: var(--yc-primary);
}

/* 二级菜单 */
.yc-nav .sub-menu {
  position: absolute;
  left: 0;
  top: 100%;
  z-index: 40;
  display: none;
  flex-direction: column;
  min-width: 168px;
  padding: 6px;
  margin-top: 6px;
  background: #fff;
  border: 1px solid var(--yc-border);
  border-radius: var(--yc-radius);
  box-shadow: var(--yc-shadow-hover);
}
.yc-nav li:hover > .sub-menu,
.yc-nav li:focus-within > .sub-menu {
  display: flex;
}

/* 下拉的"落地缝"
   主菜单项和下拉之间隔着 6px 的 margin。这 6px 里没有任何元素，
   指针一穿过去 li:hover 就断了，下拉瞬间收起——人根本来不及移进去。
   这里用一条透明伪元素把缝填死：它属于 .sub-menu，指针停在上面时
   hover 一路传到 li，下拉就能被稳稳接住。
   只在桌面横排菜单生效；折叠成列表时 .sub-menu 是 static，不需要也不该有这条桥。 */
@media (min-width: 1101px) {
  .yc-header:not(.yc-nav-tight) .yc-nav .sub-menu::before {
    content: "";
    position: absolute;
    left: -1px;
    right: -1px;
    top: -8px;
    height: 8px;
  }

  /* 第二道桥，挂在 li 上：覆盖整个菜单项的宽度。
     下拉框最窄 168px，一般比菜单项宽；但菜单项文字很长时框会窄于 li，
     从菜单项右侧往下移仍会落空，所以这里按 li 的全宽再铺一条。 */
  .yc-header:not(.yc-nav-tight) .yc-nav li.menu-item-has-children:hover::after {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    height: 8px;
  }
}
.yc-nav .sub-menu a {
  padding: 8px 10px;
  font-weight: 400;
}
.yc-nav .sub-menu .sub-menu {
  left: 100%;
  top: -6px;
  margin-top: 0;
}

/* 菜单图标
   dashicons 的默认盒子是 20×20 固定 px，直接放进菜单会比文字大一圈、
   还会把行高顶开。这里改成 1em 的方形，字号用 em 跟随菜单文字，
   主菜单、下拉、页脚链接、手机端折叠菜单都能自动缩放，不用各写一遍。
   width/height 一并覆盖：只改 font-size 不改正方形盒子的话，
   图标会在盒子里偏左或偏下，看起来像没对齐。 */
.yc-menu-icon {
  display: inline-block;
  width: 1em;
  height: 1em;
  font-size: 0.94em;
  line-height: 1;
  margin-right: 5px;
  vertical-align: 0;
  text-align: center;
  color: inherit;
}

.yc-menu-icon.dashicons {
  width: 1em;
  height: 1em;
  font-size: 0.94em;
  /* dashicons 默认 vertical-align: top，会让图标贴在行盒顶部、明显高于文字。
     归零走基线对齐：实测图标中心与文字中心相差不到 0.5px。 */
  vertical-align: 0;
}

/* 搜索框 */
.yc-search {
  position: relative;
  flex-shrink: 0;
  /* 跟着视口伸缩：宽屏给足 210，窄屏收到 180，把空间让给菜单 */
  width: clamp(180px, 14vw, 210px);
}

/* 移动端专用搜索框：桌面上不显示，避免出现两个 */
.yc-search--mobile {
  display: none;
}

.yc-search input[type="search"],
.yc-search input[type="text"] {
  width: 100%;
  height: 38px;
  padding: 0 40px 0 14px;
  border: 1px solid var(--yc-border-strong);
  border-radius: 999px;
  background: var(--yc-bg-soft);
  color: var(--yc-text);
  font-size: 14px;
  font-family: inherit;
  outline: none;
  transition: border-color 0.18s ease, background 0.18s ease;
}
.yc-search input[type="search"]:focus,
.yc-search input[type="text"]:focus {
  border-color: var(--yc-primary);
  background: #fff;
}

.yc-search button {
  position: absolute;
  right: 4px;
  top: 4px;
  width: 30px;
  height: 30px;
  display: grid;
  place-items: center;
  border: 0;
  border-radius: 50%;
  background: transparent;
  color: var(--yc-muted);
  cursor: pointer;
}
.yc-search button:hover {
  background: var(--yc-primary-soft);
  color: var(--yc-primary);
}

/* 移动端汉堡按钮 */
.yc-menu-toggle {
  display: none;
  width: 40px;
  height: 40px;
  border: 1px solid var(--yc-border-strong);
  border-radius: var(--yc-radius-sm);
  background: #fff;
  color: var(--yc-title);
  cursor: pointer;
  place-items: center;
}
.yc-menu-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  background: currentColor;
  border-radius: 2px;
  position: relative;
}
.yc-menu-toggle span::before,
.yc-menu-toggle span::after {
  content: "";
  position: absolute;
  left: 0;
  width: 18px;
  height: 2px;
  background: currentColor;
  border-radius: 2px;
}
.yc-menu-toggle span::before { top: -6px; }
.yc-menu-toggle span::after { top: 6px; }

/* 登录 / 会员区 */
.yc-header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}

.yc-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  height: 36px;
  padding: 0 16px;
  border: 1px solid var(--yc-border-strong);
  border-radius: 999px;
  background: #fff;
  color: var(--yc-title);
  font-size: 14px;
  font-weight: 500;
  font-family: inherit;
  line-height: 1;
  cursor: pointer;
  white-space: nowrap;
  transition: all 0.18s ease;
}
.yc-btn:hover {
  border-color: var(--yc-primary);
  color: var(--yc-primary);
}
.yc-btn--primary {
  border-color: var(--yc-primary);
  background: var(--yc-primary);
  color: #fff;
}
.yc-btn--primary:hover {
  border-color: var(--yc-primary-dark);
  background: var(--yc-primary-dark);
  color: #fff;
}
.yc-btn--ghost {
  border-color: transparent;
  background: transparent;
}

/* ============================================================
   4. 面包屑
   ============================================================ */
.yc-crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  padding: 16px 0 0;
  font-size: 13px;
  color: var(--yc-muted);
}
.yc-crumbs a { color: var(--yc-muted); }
.yc-crumbs a:hover { color: var(--yc-primary); }
.yc-crumbs .sep { color: #c8ced9; }

/* ============================================================
   5. 区块标题
   ============================================================ */
.yc-section-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 16px;
}

.yc-section-title {
  position: relative;
  margin: 0;
  padding-left: 12px;
  font-size: 19px;
  font-weight: 600;
  color: var(--yc-title);
}
.yc-section-title::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 3px;
  height: 17px;
  border-radius: 3px;
  background: var(--yc-primary);
}

.yc-section-more {
  font-size: 13px;
  color: var(--yc-muted);
}
.yc-section-more:hover { color: var(--yc-primary); }

/* ============================================================
   6. 文章列表卡片
   ============================================================ */
.yc-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.yc-card {
  display: flex;
  gap: 18px;
  padding: 16px;
  background: var(--yc-bg);
  border: 1px solid var(--yc-border);
  border-radius: var(--yc-radius);
  box-shadow: var(--yc-shadow);
  transition: box-shadow 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}
.yc-card:hover {
  border-color: #dce2ec;
  box-shadow: var(--yc-shadow-hover);
  transform: translateY(-1px);
}

.yc-card-thumb {
  flex: 0 0 176px;
  width: 176px;
  height: 112px;
  overflow: hidden;
  border-radius: var(--yc-radius-sm);
  background: var(--yc-bg-soft);
}
.yc-card-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.35s ease;
}
.yc-card:hover .yc-card-thumb img {
  transform: scale(1.04);
}
.yc-card-thumb--none {
  display: grid;
  place-items: center;
  color: #c3cad6;
  font-size: 26px;
  font-weight: 700;
  font-family: var(--yc-font-num);
  background: linear-gradient(135deg, #f4f6fa, #e9edf4);
}

.yc-card-body {
  flex: 1 1 auto;
  min-width: 0;
  display: flex;
  flex-direction: column;
}

.yc-card-title {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 600;
  line-height: 1.5;
}
.yc-card-title a {
  color: var(--yc-title);
}
.yc-card-title a:hover {
  color: var(--yc-primary);
}

.yc-card-excerpt {
  margin: 0 0 12px;
  font-size: 13.5px;
  line-height: 1.7;
  color: #6b7280;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  /* 摘要不足两行时也占两行高度，保证同列卡片等高 */
  min-height: 46px;
}

.yc-card-foot {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: auto;
  font-size: 12.5px;
  color: var(--yc-muted);
}
.yc-card-foot a { color: var(--yc-muted); }
.yc-card-foot a:hover { color: var(--yc-primary); }

.yc-card-cat {
  display: inline-flex;
  align-items: center;
  height: 22px;
  padding: 0 9px;
  border-radius: 999px;
  background: var(--yc-primary-soft);
  color: var(--yc-primary) !important;
  font-size: 12px;
  font-weight: 500;
}

.yc-card-stats {
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

/* 纯文字卡片（无缩略图时） */
.yc-card--notext .yc-card-body {
  padding: 2px 4px;
}

/* ============================================================
   7. 分页
   ============================================================ */
.yc-pagination {
  margin-top: 24px;
}
.yc-pagination .nav-links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 6px;
}
.yc-pagination .page-numbers {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 36px;
  height: 36px;
  padding: 0 10px;
  border: 1px solid var(--yc-border-strong);
  border-radius: var(--yc-radius-sm);
  background: #fff;
  color: var(--yc-text);
  font-size: 13.5px;
  font-family: var(--yc-font-num);
  transition: all 0.18s ease;
}
.yc-pagination .page-numbers:hover {
  border-color: var(--yc-primary);
  color: var(--yc-primary);
}
.yc-pagination .page-numbers.current {
  border-color: var(--yc-primary);
  background: var(--yc-primary);
  color: #fff;
}
.yc-pagination .page-numbers.dots {
  border-color: transparent;
  background: transparent;
}

/* 文章分页（<!--nextpage-->） */
.yc-page-links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  margin-top: 22px;
  font-size: 13.5px;
  color: var(--yc-muted);
}
.yc-page-links a,
.yc-page-links > span:not(.yc-page-links-label) {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 32px;
  height: 32px;
  padding: 0 9px;
  border: 1px solid var(--yc-border-strong);
  border-radius: var(--yc-radius-sm);
  background: #fff;
  color: var(--yc-text);
  font-family: var(--yc-font-num);
}
.yc-page-links a:hover {
  border-color: var(--yc-primary);
  color: var(--yc-primary);
}

.yc-post-nav {
  display: flex;
  gap: 12px;
  margin-top: 20px;
}
.yc-post-nav > div {
  flex: 1 1 0;
  min-width: 0;
}
.yc-post-nav a {
  display: block;
  padding: 14px 16px;
  border: 1px solid var(--yc-border);
  border-radius: var(--yc-radius);
  background: #fff;
  color: var(--yc-text);
  font-size: 13.5px;
  line-height: 1.6;
  transition: all 0.18s ease;
}
.yc-post-nav a:hover {
  border-color: var(--yc-primary);
  color: var(--yc-primary);
}
.yc-post-nav .label {
  display: block;
  margin-bottom: 3px;
  color: var(--yc-muted);
  font-size: 12px;
}

/* ============================================================
   8. 侧栏
   ============================================================ */
.yc-sidebar {
  position: sticky;
  top: 20px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  align-self: start;
}

.yc-widget {
  padding: 18px;
  background: var(--yc-bg);
  border: 1px solid var(--yc-border);
  border-radius: var(--yc-radius);
  box-shadow: var(--yc-shadow);
}

.yc-widget-title,
.yc-widget .widget-title {
  margin: 0 0 14px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--yc-border);
  font-size: 15px;
  font-weight: 600;
  color: var(--yc-title);
}

.yc-widget ul {
  margin: 0;
  padding: 0;
  list-style: none;
}
.yc-widget li {
  padding: 8px 0;
  border-bottom: 1px dashed var(--yc-border);
  font-size: 13.5px;
  line-height: 1.6;
}
.yc-widget li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}
.yc-widget li:first-child {
  padding-top: 0;
}
.yc-widget li a {
  color: #545c6b;
}
.yc-widget li a:hover {
  color: var(--yc-primary);
}
.yc-widget li .count {
  color: var(--yc-muted);
  font-size: 12px;
  font-family: var(--yc-font-num);
}

.yc-widget p {
  margin: 0 0 10px;
  font-size: 13.5px;
}
.yc-widget p:last-child { margin-bottom: 0; }

.yc-widget img {
  border-radius: var(--yc-radius-sm);
}

.yc-widget select {
  width: 100%;
  height: 38px;
  padding: 0 10px;
  border: 1px solid var(--yc-border-strong);
  border-radius: var(--yc-radius-sm);
  font-family: inherit;
  font-size: 13.5px;
  color: var(--yc-text);
  background: #fff;
}

.yc-widget .tagcloud a {
  display: inline-block;
  margin: 0 6px 6px 0;
  padding: 3px 10px;
  border-radius: 999px;
  background: var(--yc-bg-soft);
  color: #6b7280;
  font-size: 12.5px !important;
}
.yc-widget .tagcloud a:hover {
  background: var(--yc-primary-soft);
  color: var(--yc-primary);
}

/* 侧栏购买卡
   —— 内容就是 erphpdown 的下载框，这里只调尺寸，不改外观，
   保证和文章底部那个看起来是同一个东西。 */
.yc-side-buy {
  min-width: 0;
}
.yc-side-buy .erphpdown {
  width: 100%;
  max-width: 100%;
  box-sizing: border-box;
  margin: 0 !important;
  padding: 12px 14px 16px !important;
  font-size: 13px !important;
  line-height: 1.7 !important;
  word-break: break-word;
}
.yc-side-buy .erphpdown > legend {
  padding: 0 6px !important;
  font-size: 15px;
}
.yc-side-buy .erphpdown .erphpdown-price {
  font-size: 125%;
}
.yc-side-buy .erphpdown .erphpdown-buy,
.yc-side-buy .erphpdown .erphpdown-vip,
.yc-side-buy .erphpdown .erphp-login-must,
.yc-side-buy .erphpdown .erphpdown-down,
.yc-side-buy .erphpdown .erphpdown-checkpan {
  margin: 6px 0 0 8px;
  padding: 6px 14px 7px;
  font-size: 13px;
}
.yc-side-buy .erphpdown .erphpdown-item {
  font-size: 13px;
}
.yc-side-buy .erphpdown .erphpdown-child {
  padding: 10px 10px 12px !important;
}
.yc-side-buy .erphpdown img,
.yc-side-buy .erphpdown iframe {
  max-width: 100%;
  height: auto;
}

/* 侧栏：作者/站点信息卡 */
.yc-profile {
  padding: 20px 18px;
  text-align: center;
}
.yc-profile-avatar {
  width: 62px;
  height: 62px;
  margin: 0 auto 10px;
  border-radius: 50%;
  overflow: hidden;
  background: var(--yc-primary-soft);
}
.yc-profile-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.yc-profile h3 {
  margin: 0 0 4px;
  font-size: 15px;
}
.yc-profile p {
  margin: 0;
  color: var(--yc-muted);
  font-size: 12.5px;
  line-height: 1.65;
}

/* ============================================================
   9. 文章详情
   ============================================================ */
.yc-article {
  padding: 28px;
  background: var(--yc-bg);
  border: 1px solid var(--yc-border);
  border-radius: var(--yc-radius);
  box-shadow: var(--yc-shadow);
}

.yc-article-title {
  margin: 0 0 14px;
  font-size: 28px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--yc-title);
  letter-spacing: -0.3px;
}

.yc-article-meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 18px;
  padding-bottom: 18px;
  margin-bottom: 22px;
  border-bottom: 1px solid var(--yc-border);
  font-size: 13px;
  color: var(--yc-muted);
}
.yc-article-meta a {
  color: var(--yc-muted);
}
.yc-article-meta a:hover {
  color: var(--yc-primary);
}
.yc-article-meta .item {
  display: inline-flex;
  align-items: center;
  gap: 5px;
}
.yc-article-meta .dot {
  width: 3px;
  height: 3px;
  border-radius: 50%;
  background: #cfd5e0;
}

/* 正文排版 */
.yc-content {
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--yc-text);
  overflow-wrap: break-word;
}
.yc-content > *:first-child { margin-top: 0; }
.yc-content > *:last-child { margin-bottom: 0; }

.yc-content h2 {
  margin: 1.8em 0 0.7em;
  padding-left: 12px;
  border-left: 3px solid var(--yc-primary);
  font-size: 21px;
}
.yc-content h3 {
  margin: 1.5em 0 0.6em;
  font-size: 18px;
}
.yc-content h4 {
  margin: 1.3em 0 0.5em;
  font-size: 16px;
}

.yc-content img {
  border-radius: var(--yc-radius-sm);
  height: auto;
}

.yc-content a {
  text-decoration: underline;
  text-decoration-color: rgba(37, 99, 235, 0.35);
  text-underline-offset: 3px;
}
.yc-content a:hover {
  text-decoration-color: var(--yc-primary);
}

.yc-content ul,
.yc-content ol {
  padding-left: 1.6em;
}
.yc-content li { margin-bottom: 0.4em; }

.yc-content .wp-caption { max-width: 100%; }
.yc-content .wp-caption-text,
.yc-content figcaption {
  margin-top: 6px;
  color: var(--yc-muted);
  font-size: 12.5px;
  text-align: center;
}

.yc-content .alignleft {
  float: left;
  margin: 0 20px 12px 0;
}
.yc-content .alignright {
  float: right;
  margin: 0 0 12px 20px;
}
.yc-content .aligncenter {
  display: block;
  margin: 1em auto;
}

/* 文章标签 */
.yc-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 26px;
  padding-top: 20px;
  border-top: 1px solid var(--yc-border);
}
.yc-tags a {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 999px;
  background: var(--yc-bg-soft);
  color: #6b7280;
  font-size: 12.5px;
}
.yc-tags a:hover {
  background: var(--yc-primary-soft);
  color: var(--yc-primary);
}

/* 作者框 */
.yc-author-box {
  display: flex;
  gap: 14px;
  margin-top: 20px;
  padding: 18px;
  background: var(--yc-bg);
  border: 1px solid var(--yc-border);
  border-radius: var(--yc-radius);
}
.yc-author-box .avatar {
  flex: 0 0 48px;
  width: 48px;
  height: 48px;
  border-radius: 50%;
}
.yc-author-box strong {
  display: block;
  font-size: 14px;
  color: var(--yc-title);
}
.yc-author-box p {
  margin: 4px 0 0;
  color: var(--yc-muted);
  font-size: 13px;
  line-height: 1.7;
}

/* 相关文章 */
.yc-related {
  margin-top: 20px;
  padding: 20px 22px;
  background: var(--yc-bg);
  border: 1px solid var(--yc-border);
  border-radius: var(--yc-radius);
}
.yc-related h3 {
  margin: 0 0 12px;
  font-size: 16px;
}
.yc-related ul {
  margin: 0;
  padding: 0;
  list-style: none;
}
.yc-related li {
  padding: 7px 0;
  border-bottom: 1px dashed var(--yc-border);
  font-size: 14px;
}
.yc-related li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}
.yc-related li a {
  color: #545c6b;
}
.yc-related li a:hover {
  color: var(--yc-primary);
}

/* 文章页底部提示：付费/会员说明（可选） */
.yc-article-note {
  margin-top: 18px;
  padding: 12px 16px;
  border-radius: var(--yc-radius-sm);
  background: #fffbeb;
  border: 1px solid #fde68a;
  color: #92400e;
  font-size: 13px;
  line-height: 1.7;
}

/* 评论可见 / 登录可见 的提示框（替代 Modown 的 [reply] [login] 样式） */
.yc-gate {
  margin: 18px 0;
  padding: 14px 18px;
  border: 1px dashed var(--yc-border-strong);
  border-radius: var(--yc-radius-sm);
  background: var(--yc-bg-soft);
  color: #6b7280;
  font-size: 13.5px;
  line-height: 1.7;
  text-align: center;
}
.yc-gate a {
  color: var(--yc-primary);
  font-weight: 500;
}
.yc-gate-body {
  margin: 0;
}

/* 代码块 */
.yc-code-block pre {
  margin: 1.2em 0;
}

/* 广告位 */
.yc-ad {
  margin: 18px 0;
  text-align: center;
}
.yc-ad img {
  max-width: 100%;
  height: auto;
  border-radius: var(--yc-radius-sm);
}

/* ============================================================
   10. 独立页面
   ============================================================ */
.yc-page-head {
  padding: 26px 28px;
  background: var(--yc-bg);
  border: 1px solid var(--yc-border);
  border-radius: var(--yc-radius);
  box-shadow: var(--yc-shadow);
  margin-bottom: 16px;
}
.yc-page-head h1 {
  margin: 0;
  font-size: 26px;
  font-weight: 700;
  letter-spacing: -0.3px;
}
.yc-page-head p {
  margin: 8px 0 0;
  color: var(--yc-muted);
  font-size: 13.5px;
}

.yc-page-body {
  padding: 28px;
  background: var(--yc-bg);
  border: 1px solid var(--yc-border);
  border-radius: var(--yc-radius);
  box-shadow: var(--yc-shadow);
}

/* ============================================================
   11. 评论
   ============================================================ */
.yc-comments {
  margin-top: 20px;
  padding: 24px 28px;
  background: var(--yc-bg);
  border: 1px solid var(--yc-border);
  border-radius: var(--yc-radius);
  box-shadow: var(--yc-shadow);
}

.yc-comments-title,
.yc-comments .comments-title {
  margin: 0 0 18px;
  font-size: 17px;
  font-weight: 600;
}

.yc-comments ol {
  margin: 0;
  padding: 0;
  list-style: none;
}
.yc-comments ol ol {
  padding-left: 26px;
}

.yc-comments .comment-body {
  padding: 16px 0;
  border-bottom: 1px solid var(--yc-border);
}
.yc-comments .comment-body > p {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.75;
}

.yc-comments .comment-author {
  display: flex;
  align-items: center;
  gap: 9px;
  font-size: 13.5px;
}
.yc-comments .comment-author img {
  border-radius: 50%;
}
.yc-comments .comment-author .fn {
  font-style: normal;
  font-weight: 600;
  color: var(--yc-title);
}

.yc-comments .comment-meta {
  font-size: 12px;
  color: var(--yc-muted);
  margin-top: 2px;
}
.yc-comments .comment-metadata a {
  color: var(--yc-muted);
}
.yc-comments .comment-metadata a:hover {
  color: var(--yc-primary);
}

.yc-comments .reply {
  margin-top: 6px;
  font-size: 12.5px;
}

.yc-comments .comment-respond {
  margin-top: 22px;
}

.yc-comments .comment-reply-title {
  font-size: 16px;
  margin: 0 0 14px;
}

.yc-comments .comment-form > p {
  margin: 0 0 12px;
}
.yc-comments .comment-form label {
  display: block;
  margin-bottom: 5px;
  font-size: 13px;
  color: #5b6372;
}

.yc-comments input[type="text"],
.yc-comments input[type="email"],
.yc-comments input[type="url"],
.yc-comments textarea {
  width: 100%;
  padding: 10px 13px;
  border: 1px solid var(--yc-border-strong);
  border-radius: var(--yc-radius-sm);
  background: #fff;
  color: var(--yc-text);
  font-family: inherit;
  font-size: 14px;
  line-height: 1.6;
  outline: none;
  transition: border-color 0.18s ease;
}
.yc-comments input:focus,
.yc-comments textarea:focus {
  border-color: var(--yc-primary);
}
.yc-comments textarea {
  min-height: 110px;
  resize: vertical;
}

.yc-comments .submit,
.yc-comments input[type="submit"],
.yc-comments button[type="submit"] {
  display: inline-flex;
  align-items: center;
  height: 38px;
  padding: 0 20px;
  border: 0;
  border-radius: 999px;
  background: var(--yc-primary);
  color: #fff;
  font-family: inherit;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.18s ease;
}
.yc-comments .submit:hover,
.yc-comments input[type="submit"]:hover,
.yc-comments button[type="submit"]:hover {
  background: var(--yc-primary-dark);
}

.yc-comments .comment-notes,
.yc-comments .logged-in-as {
  color: var(--yc-muted);
  font-size: 12.5px;
}

.yc-comments .comment-list .children {
  margin-top: 0;
}

/* ============================================================
   12. 空状态 / 404
   ============================================================ */
.yc-empty {
  padding: 64px 24px;
  text-align: center;
  background: var(--yc-bg);
  border: 1px solid var(--yc-border);
  border-radius: var(--yc-radius);
}
.yc-empty-mark {
  width: 56px;
  height: 56px;
  margin: 0 auto 16px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--yc-primary-soft);
  color: var(--yc-primary);
  font-size: 22px;
  font-weight: 700;
  font-family: var(--yc-font-num);
}
.yc-empty h2 {
  margin: 0 0 8px;
  font-size: 19px;
}
.yc-empty p {
  margin: 0 0 20px;
  color: var(--yc-muted);
  font-size: 14px;
}
.yc-empty .yc-search {
  width: 100%;
  max-width: 360px;
  margin: 0 auto;
}

/* ============================================================
   13. 页脚
   ============================================================ */
.yc-footer {
  margin-top: 8px;
  background: var(--yc-dark);
  color: #9aa3b2;
  font-size: 13.5px;
}

.yc-footer a {
  color: #c4ccd9;
}
.yc-footer a:hover {
  color: #fff;
}

.yc-footer-top {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr;
  gap: 36px;
  padding: 44px 0 34px;
}

/* 关掉某栏后按实际栏数分配宽度，避免留下大片空白 */
.yc-footer-top--1 {
  grid-template-columns: 1fr;
}

.yc-footer-top--2 {
  /* 只剩一栏链接时让它靠右收边，比在中间留一段空白更平衡 */
  grid-template-columns: minmax(0, 1fr) auto;
}

.yc-footer-brand {
  color: #fff;
  font-size: 17px;
  font-weight: 600;
  margin-bottom: 10px;
}
.yc-footer-desc {
  margin: 0;
  line-height: 1.8;
  color: #8b93a3;
  font-size: 13px;
}

.yc-footer h4 {
  margin: 0 0 14px;
  color: #eef1f6;
  font-size: 14px;
  font-weight: 600;
}

.yc-footer ul {
  margin: 0;
  padding: 0;
  list-style: none;
}
.yc-footer li {
  padding: 5px 0;
  font-size: 13px;
}

.yc-footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  padding: 18px 0;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  color: #767f8f;
  font-size: 12.5px;
}

/* 版权 / ICP / 公安备案在一行内排开 */
.yc-footer-legal .yc-icp {
  margin-left: 12px;
}

.yc-footer-legal .yc-icp:first-child {
  margin-left: 0;
}

/* 返回顶部 */
.yc-to-top {
  position: fixed;
  right: 24px;
  bottom: 28px;
  z-index: 60;
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  border: 1px solid var(--yc-border);
  border-radius: 50%;
  background: #fff;
  color: var(--yc-title);
  box-shadow: 0 4px 16px rgba(20, 22, 28, 0.1);
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: all 0.22s ease;
}
.yc-to-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.yc-to-top:hover {
  border-color: var(--yc-primary);
  color: var(--yc-primary);
}

/* ============================================================
   14. WordPress 对齐类 & 前台编辑链接
   ============================================================ */
.alignleft {
  float: left;
  margin: 0 20px 12px 0;
}
.alignright {
  float: right;
  margin: 0 0 12px 20px;
}
.aligncenter {
  display: block;
  margin: 1em auto;
}
.wp-caption {
  max-width: 100%;
}
.wp-caption-text {
  color: var(--yc-muted);
  font-size: 12.5px;
  text-align: center;
}
.sticky .yc-card-title::after,
.yc-card--sticky .yc-card-title::after {
  content: "置顶";
  display: inline-block;
  margin-left: 8px;
  padding: 1px 7px;
  border-radius: 4px;
  background: var(--yc-primary-soft);
  color: var(--yc-primary);
  font-size: 11px;
  font-weight: 500;
  vertical-align: middle;
}

.post-edit-link {
  font-size: 12px;
  color: var(--yc-muted) !important;
}

/* ============================================================
   15. 响应式
   ============================================================ */
@media (max-width: 1024px) {
  :root {
    --yc-sidebar: 268px;
    --yc-gutter: 20px;
  }
  .yc-layout {
    gap: 20px;
  }
  .yc-card-thumb {
    flex-basis: 150px;
    width: 150px;
    height: 100px;
  }
  .yc-article-title {
    font-size: 25px;
  }
}

@media (max-width: 860px) {
  .yc-layout,
  .yc-layout--left {
    grid-template-columns: minmax(0, 1fr);
  }
  .yc-layout--left .yc-main,
  .yc-layout--left .yc-sidebar {
    order: initial;
  }
  .yc-sidebar {
    position: static;
    margin-top: 4px;
  }
  .yc-footer-top {
    grid-template-columns: 1fr 1fr;
    gap: 26px;
    padding: 34px 0 26px;
  }
  .yc-footer-brand-col {
    grid-column: 1 / -1;
  }
}

/* 1300 以下头部开始变挤：先把装饰性内容让出来，菜单始终保证一行。
   注意：菜单项数量是不固定的，光靠断点无法覆盖所有情况，
   真正的兜底是 1101px 以上的「溢出保护」（脚本实测，放不下就折叠）。 */
@media (max-width: 1300px) {
  .yc-header-inner {
    gap: 12px;
  }
  .yc-brand-text small {
    display: none;
  }
  .yc-nav a {
    padding: 8px 9px;
    font-size: 13.5px;
  }
  .yc-search {
    width: 160px;
  }
  .yc-header-actions {
    gap: 6px;
  }
  .yc-header-actions .yc-btn {
    height: 34px;
    padding: 0 12px;
    font-size: 13px;
  }
}

/* 1101px 以上出现「菜单放不下」时，由脚本给 .yc-header 加 .yc-nav-tight：
   菜单收进汉堡下拉，不再压到搜索框上。这段只在桌面宽度生效，
   与下面 1100px 的移动端折叠规则互不干扰。 */
@media (min-width: 1101px) {
  .yc-header.yc-nav-tight .yc-menu-toggle {
    display: grid;
  }
  .yc-header.yc-nav-tight .yc-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    z-index: 60;
    display: none;
    padding: 10px var(--yc-gutter) 14px;
    background: var(--yc-bg);
    border-top: 1px solid var(--yc-border);
    border-bottom: 1px solid var(--yc-border);
    box-shadow: var(--yc-shadow-hover);
  }
  .yc-header.yc-nav-tight .yc-nav.is-open {
    display: block;
  }
  .yc-header.yc-nav-tight .yc-nav ul {
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
    max-width: 1296px;
    margin: 0 auto;
  }
  .yc-header.yc-nav-tight .yc-nav a {
    padding: 10px 12px;
    font-size: 15px;
  }
  .yc-header.yc-nav-tight .yc-nav .sub-menu {
    position: static;
    display: flex;
    margin: 0 0 0 12px;
    padding: 0;
    border: 0;
    box-shadow: none;
    background: transparent;
  }
  .yc-header.yc-nav-tight .yc-nav .sub-menu a {
    font-size: 14px;
    color: #6b7280;
  }
}

/* 1100 以下：导航改为折叠。
   中文菜单项数量不固定，这个宽度内横向排列已无法保证不压到搜索框，
   折叠比挤成一团更好用。 */
@media (max-width: 1100px) {
  .yc-header-inner {
    min-height: 58px;
    gap: 10px;
    flex-wrap: wrap;
  }
  .yc-menu-toggle {
    display: grid;
    order: 1;
  }
  .yc-brand {
    order: 2;
    font-size: 17px;
  }
  .yc-header-actions {
    order: 3;
    margin-left: auto;
  }
  .yc-header-actions .yc-btn--primary {
    height: 32px;
    padding: 0 12px;
    font-size: 13px;
  }

  /* 折叠菜单：默认收起，点汉堡展开 */
  .yc-nav {
    order: 4;
    flex: 1 1 100%;
    display: none;
    padding: 6px 0 12px;
    border-top: 1px solid var(--yc-border);
  }
  .yc-nav.is-open {
    display: block;
  }
  .yc-nav ul {
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
  }
  .yc-nav a {
    padding: 10px 12px;
    font-size: 15px;
  }
  .yc-nav .sub-menu {
    position: static;
    display: flex;
    margin: 0 0 0 12px;
    border: 0;
    box-shadow: none;
    padding: 0;
    background: transparent;
  }
  .yc-nav .sub-menu a {
    font-size: 14px;
    color: #6b7280;
  }

  /* 头部搜索框收起，改到折叠菜单里，避免两个 */
  .yc-header .yc-search {
    display: none;
  }
  .yc-header .yc-search--mobile {
    display: block;
    width: 100%;
    margin-top: 10px;
  }
}

@media (max-width: 768px) {
  :root {
    --yc-gutter: 16px;
  }
  body {
    font-size: 14.5px;
  }

  .yc-layout {
    padding: 18px 0 32px;
    gap: 14px;
  }

  .yc-card {
    padding: 13px;
    gap: 12px;
  }
  .yc-card-thumb {
    flex-basis: 108px;
    width: 108px;
    height: 76px;
  }
  .yc-card-title {
    font-size: 15px;
    margin-bottom: 5px;
  }
  .yc-card-excerpt {
    display: none;
  }
  .yc-card-foot {
    gap: 10px;
    font-size: 11.5px;
  }

  .yc-article,
  .yc-page-body {
    padding: 18px 16px;
  }
  .yc-article-title {
    font-size: 21px;
  }
  .yc-article-meta {
    gap: 12px;
    padding-bottom: 14px;
    margin-bottom: 16px;
    font-size: 12px;
  }
  .yc-content {
    font-size: 15px;
    line-height: 1.8;
  }
  .yc-content h2 { font-size: 18px; }
  .yc-content h3 { font-size: 16.5px; }

  .yc-page-head {
    padding: 18px 16px;
  }
  .yc-page-head h1 {
    font-size: 21px;
  }

  .yc-post-nav {
    flex-direction: column;
  }

  .yc-comments {
    padding: 18px 16px;
  }

  .yc-footer-top {
    grid-template-columns: 1fr;
    gap: 22px;
    padding: 28px 0 22px;
  }
  .yc-footer-bottom {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
  }

  .yc-to-top {
    right: 14px;
    bottom: 16px;
    width: 38px;
    height: 38px;
  }
}

/* 打印 */
@media print {
  .yc-header,
  .yc-sidebar,
  .yc-footer,
  .yc-to-top,
  .yc-post-nav,
  .yc-comments,
  .yc-related {
    display: none !important;
  }
  .yc-layout {
    grid-template-columns: 1fr;
    padding: 0;
  }
  .yc-article {
    border: 0;
    padding: 0;
    box-shadow: none;
  }
}

/* ============================================================
   登录页 / 旧模板提示 / VIP 页补充
   ============================================================ */
.yc-auth {
  max-width: 420px;
  margin: 0 auto;
  padding: 12px 0 8px;
}
.yc-auth-title {
  margin: 0 0 22px;
  font-size: 22px;
  font-weight: 700;
  color: #14161c;
  text-align: center;
}
#yc-login-form p {
  margin: 0 0 16px;
}
#yc-login-form label {
  display: block;
  margin-bottom: 6px;
  font-size: 13px;
  color: #444b57;
}
#yc-login-form input[type="text"],
#yc-login-form input[type="password"] {
  width: 100%;
  height: 44px;
  padding: 0 13px;
  border: 1px solid #e3e7ef;
  border-radius: 9px;
  font-size: 14px;
  color: #14161c;
  background: #fff;
  transition: border-color 0.18s ease, box-shadow 0.18s ease;
}
#yc-login-form input[type="text"]:focus,
#yc-login-form input[type="password"]:focus {
  outline: none;
  border-color: #2563eb;
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12);
}
#yc-login-form .login-remember label {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin: 0;
  color: #6b7280;
}
#yc-login-form .login-submit {
  margin: 20px 0 0;
}
#yc-login-form input[type="submit"] {
  width: 100%;
  height: 46px;
  border: 0;
  border-radius: 9px;
  background: #2563eb;
  color: #fff;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.18s ease;
}
#yc-login-form input[type="submit"]:hover {
  background: #1d4ed8;
}
.yc-auth-links {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  justify-content: center;
  margin-top: 18px;
  font-size: 13px;
}
.yc-auth-links a {
  color: #6b7280;
}
.yc-auth-links a:hover {
  color: #2563eb;
}

.yc-vip-login-tip {
  margin: 18px 0 4px;
  font-size: 13px;
  color: #6b7280;
  text-align: center;
}
.yc-vip-login-tip a {
  color: #2563eb;
}

.yc-admin-tip {
  margin: 24px 0 0;
  padding: 14px 16px;
  border: 1px dashed #f0c36d;
  border-radius: 10px;
  background: #fffdf5;
  font-size: 13px;
  line-height: 1.75;
  color: #7a5a12;
}
.yc-admin-tip strong {
  display: block;
  margin-bottom: 6px;
  color: #8a5a00;
}
.yc-admin-tip p {
  margin: 0 0 6px;
}
.yc-admin-tip code {
  padding: 1px 5px;
  border-radius: 4px;
  background: #f6ecd2;
  font-size: 12px;
}

/* ============================================================
   广告位
   所有广告位共用：留空不输出；内容水平居中；图片不溢出容器。
   「广告」角标默认不输出（后台可开），开启时也只是浅灰小字，不抢画面。
   ============================================================ */
.yc-ad {
  position: relative;
  text-align: center;
  overflow: hidden;
}
.yc-ad img,
.yc-ad iframe,
.yc-ad video {
  max-width: 100%;
  height: auto;
}
.yc-ad iframe {
  display: inline-block;
  vertical-align: middle;
}
.yc-ad-badge {
  position: absolute;
  top: 6px;
  left: 8px;
  z-index: 2;
  font-size: 11px;
  line-height: 1;
  letter-spacing: 0.06em;
  color: rgba(110, 118, 135, 0.6);
  text-shadow: 0 1px 2px rgba(255, 255, 255, 0.75);
  pointer-events: none;
  user-select: none;
}

/* 导航下方横幅：与正文容器同宽 */
.yc-ad--ad_header_banner {
  width: 100%;
  max-width: var(--yc-container);
  margin: 16px auto 0;
  padding: 0 var(--yc-gutter);
  box-sizing: border-box;
}
.yc-ad--ad_header_banner > * {
  margin: 0 auto;
}
.yc-ad--ad_header_banner img {
  display: block;
  margin: 0 auto;
  border-radius: var(--yc-radius-sm);
}

/* 侧栏广告：与侧栏卡片同款边框 */
.yc-ad--sidebar {
  margin: 0 0 18px;
  padding: 12px;
  background: var(--yc-bg);
  border: 1px solid var(--yc-border);
  border-radius: var(--yc-radius);
  box-shadow: var(--yc-shadow);
}
.yc-ad--sidebar .yc-ad-badge {
  top: 14px;
  left: 18px;
}

/* 列表信息流：与文章卡片同款外观，混排不突兀 */
.yc-ad--feed {
  padding: 16px;
  background: var(--yc-bg);
  border: 1px solid var(--yc-border);
  border-radius: var(--yc-radius);
  box-shadow: var(--yc-shadow);
}

/* 文章页：标题下 / 正文后 */
.yc-ad--ad_single_top {
  margin: 0 0 18px;
}
.yc-ad--ad_single_bottom {
  margin: 20px 0 0;
}
.yc-ad--ad_single_top img,
.yc-ad--ad_single_bottom img {
  border-radius: var(--yc-radius-sm);
}

@media (max-width: 768px) {
  .yc-ad--ad_header_banner {
    margin-top: 12px;
  }
  .yc-ad--sidebar {
    margin-bottom: 14px;
  }
}