/* ==========================================================================
   UP Video 主样式
   设计基调：现代、干净、B站 / YouTube 风格的视频平台感
   ========================================================================== */

/* ---------- 1. 设计变量（暗色模式通过 [data-theme="dark"] 切换） ---------- */
:root {
    --upv-primary: #00a1d6;
    --upv-primary-dark: #0087b3;
    --upv-accent: #fb7299;
    --upv-bg: #f6f7f8;
    --upv-surface: #ffffff;
    --upv-surface-2: #f1f2f3;
    --upv-text: #18191c;
    --upv-text-2: #61666d;
    --upv-text-3: #9499a0;
    --upv-border: #e3e5e7;
    --upv-radius: 10px;
    --upv-radius-sm: 6px;
    --upv-shadow: 0 1px 2px rgba(0, 0, 0, .04), 0 4px 16px rgba(0, 0, 0, .06);
    --upv-shadow-hover: 0 4px 8px rgba(0, 0, 0, .08), 0 12px 32px rgba(0, 0, 0, .12);
    --upv-container: 1200px;
    --upv-font: -apple-system, BlinkMacSystemFont, "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", "Noto Sans SC", "Segoe UI", sans-serif;
    --upv-font-size: 16px;
    --upv-header-h: 60px;
    --upv-ad-gap: 24px;
}

[data-theme="dark"] {
    --upv-bg: #17181a;
    --upv-surface: #202226;
    --upv-surface-2: #26282d;
    --upv-text: #e7e9ec;
    --upv-text-2: #a6a9b0;
    --upv-text-3: #7b7e85;
    --upv-border: #2e3136;
    --upv-shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 4px 16px rgba(0, 0, 0, .35);
    --upv-shadow-hover: 0 4px 8px rgba(0, 0, 0, .4), 0 12px 32px rgba(0, 0, 0, .5);
}

/* ---------- 2. 基础 ---------- */
*, *::before, *::after { box-sizing: border-box; }

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

body {
    margin: 0;
    background: var(--upv-bg);
    color: var(--upv-text);
    font-family: var(--upv-font);
    font-size: var(--upv-font-size);
    line-height: 1.7;
    transition: background .25s ease, color .25s ease;
}

img { max-width: 100%; height: auto; }
a { color: var(--upv-text); text-decoration: none; transition: color .2s ease; }
a:hover { color: var(--upv-primary); }
button { font-family: inherit; cursor: pointer; }
h1, h2, h3, h4 { line-height: 1.35; margin: 0 0 .5em; }

::selection { background: var(--upv-primary); color: #fff; }

.upv-container {
    width: min(var(--upv-container), calc(100% - 48px));
    margin-inline: auto;
}

.upv-skip-link {
    position: absolute;
    left: -9999px;
    top: 0;
    background: var(--upv-primary);
    color: #fff;
    padding: 8px 16px;
    z-index: 9999;
    border-radius: 0 0 var(--upv-radius-sm) 0;
}
.upv-skip-link:focus { left: 0; color: #fff; }

.screen-reader-text {
    position: absolute;
    width: 1px; height: 1px;
    clip: rect(1px, 1px, 1px, 1px);
    overflow: hidden;
}

/* ==========================================================================
   freedidi 式网格文章流 + 数字分页（upv-grid / upv-pagenavi）
   ========================================================================== */
.upv-grid {
  display: grid;
  grid-template-columns: repeat(var(--upv-grid-cols, 3), 1fr);
  gap: 24px 20px;
}
.upv-grid__item { break-inside: avoid; }
.upv-grid__inner {
  background: var(--upv-surface);
  border: 1px solid var(--upv-border);
  border-radius: var(--upv-radius, 10px);
  overflow: hidden;
  transition: box-shadow .25s ease, transform .25s ease;
}
.upv-grid__inner:hover {
  transform: translateY(-3px);
  box-shadow: var(--upv-shadow-hover);
}
.upv-grid__top { position: relative; }
.upv-grid__thumb { display: block; position: relative; aspect-ratio: 16 / 9; background: var(--upv-border); }
.upv-grid__thumb img { width: 100%; height: 100%; object-fit: cover; display: block; transition: transform .3s ease; }
.upv-grid__inner:hover .upv-grid__thumb img { transform: scale(1.05); }
.upv-grid__thumb--empty::after { content: "▶"; position: absolute; inset: 0; display: flex; align-items: center; justify-content: center; font-size: 24px; color: var(--upv-text-2); }
.upv-grid__item .upv-card__duration { position: absolute; right: 6px; bottom: 6px; z-index: 2; }
/* 分类浮层（封面左上） */
.upv-grid__cats {
  position: absolute;
  left: 0; top: 0;
  z-index: 2;
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  padding: 6px;
  max-width: 100%;
}
.upv-grid__cats a {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 3px;
  background: rgba(0, 0, 0, .55);
  color: #fff;
  font-size: 11px;
  line-height: 1.5;
  max-width: 8em;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  backdrop-filter: blur(2px);
}
.upv-grid__cats a:hover { background: var(--upv-primary); color: #fff; }
.upv-grid__title {
  margin: 0;
  padding: 10px 14px 4px;
  font-size: 15px;
  font-weight: 600;
  line-height: 1.45;
}
.upv-grid__title a { color: var(--upv-text); }
.upv-grid__title a:hover { color: var(--upv-primary); }
.upv-grid__meta {
  list-style: none;
  margin: 0;
  padding: 4px 14px 12px;
  display: flex;
  align-items: center;
  gap: 14px;
  color: var(--upv-text-2);
  font-size: 12.5px;
}
.upv-grid__date { display: inline-flex; align-items: center; gap: 4px; }

/* 数字分页（对标 wp-pagenavi / freedidi） */
.upv-pagenavi {
  clear: both;
  margin: 32px 0 8px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  font-size: 14px;
}
.upv-pagenavi .pages { margin-right: 10px; color: var(--upv-text-2); }
.upv-pagenavi .current,
.upv-pagenavi a.page,
.upv-pagenavi .previouspostslink,
.upv-pagenavi .nextpostslink {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 36px;
  height: 36px;
  padding: 0 10px;
  border: 1px solid var(--upv-border);
  border-radius: 4px;
  background: var(--upv-surface);
  color: var(--upv-text);
}
.upv-pagenavi a.page:hover,
.upv-pagenavi .previouspostslink:hover,
.upv-pagenavi .nextpostslink:hover {
  border-color: var(--upv-primary);
  color: var(--upv-primary);
}
.upv-pagenavi .current {
  background: var(--upv-primary);
  border-color: var(--upv-primary);
  color: #fff;
}
.upv-pagenavi .extend { padding: 0 2px; color: var(--upv-text-2); }

/* 布局：主栏 + 侧边栏 */
.upv-layout {
    display: flex;
    gap: 32px;
    padding: 24px 0 48px;
}
.upv-main { flex: 1 1 auto; min-width: 0; }
.upv-sidebar { flex: 0 0 300px; }

/* ---------- 3. 按钮 / 徽章 / 区块标题 ---------- */
.upv-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 9px 20px;
    border: 1px solid var(--upv-border);
    border-radius: var(--upv-radius-sm);
    background: var(--upv-surface);
    color: var(--upv-text);
    font-size: 14px;
    font-weight: 500;
    line-height: 1.4;
    transition: all .2s ease;
}
.upv-btn:hover { border-color: var(--upv-primary); color: var(--upv-primary); }
.upv-btn--primary { background: var(--upv-primary); border-color: var(--upv-primary); color: #fff; }
.upv-btn--primary:hover { background: var(--upv-primary-dark); border-color: var(--upv-primary-dark); color: #fff; }
.upv-btn--accent { background: var(--upv-accent); border-color: var(--upv-accent); color: #fff; }
.upv-btn--accent:hover { opacity: .88; color: #fff; }
.upv-btn--sm { padding: 6px 14px; font-size: 13px; }

.upv-badge {
    display: inline-block;
    padding: 2px 10px;
    border-radius: 4px;
    background: var(--upv-primary);
    color: #fff;
    font-size: 12px;
    font-weight: 600;
    line-height: 1.6;
}
.upv-badge--accent { background: var(--upv-accent); }

.upv-section { padding: 20px 0 8px; }
.upv-section--alt { background: var(--upv-surface); border-block: 1px solid var(--upv-border); padding-block: 24px; margin-block: 12px; }

.upv-section-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 16px;
}
.upv-section-head__title {
    position: relative;
    margin: 0;
    padding-left: 12px;
    font-size: 20px;
    font-weight: 700;
}
.upv-section-head__title::before {
    content: "";
    position: absolute;
    left: 0; top: 4px; bottom: 4px;
    width: 4px;
    border-radius: 2px;
    background: var(--upv-primary);
}
.upv-section-head__more {
    display: inline-flex;
    align-items: center;
    gap: 2px;
    color: var(--upv-text-2);
    font-size: 13px;
}
.upv-section-head__more:hover { color: var(--upv-primary); }

/* ---------- 4. 头部导航 ---------- */
.upv-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: var(--upv-surface);
    border-bottom: 1px solid var(--upv-border);
    transition: box-shadow .25s ease;
}
.upv-header.is-scrolled { box-shadow: var(--upv-shadow); }
.upv-header__inner {
    display: flex;
    align-items: center;
    gap: 16px;
    height: var(--upv-header-h);
}
.upv-logo { flex: 0 0 auto; }
.upv-logo__link { display: inline-flex; align-items: center; gap: 8px; font-size: 20px; font-weight: 800; color: var(--upv-text); }
.upv-logo__mark {
    display: inline-flex;
    align-items: center; justify-content: center;
    width: 34px; height: 34px;
    border-radius: 10px;
    background: linear-gradient(135deg, var(--upv-primary), #33c6ec);
    color: #fff;
}
.upv-logo__text { letter-spacing: .5px; }

.upv-nav { flex: 1 1 auto; min-width: 0; }
.upv-menu {
    display: flex;
    align-items: center;
    gap: 4px;
    margin: 0; padding: 0;
    list-style: none;
}
.upv-menu a {
    display: block;
    padding: 8px 14px;
    border-radius: var(--upv-radius-sm);
    font-size: 15px;
    font-weight: 500;
    color: var(--upv-text);
}
.upv-menu a:hover { color: var(--upv-primary); background: var(--upv-surface-2); }
.upv-menu .current-menu-item > a { color: var(--upv-primary); font-weight: 700; }
/* 二级菜单 */
.upv-menu .menu-item-has-children { position: relative; }
.upv-menu .sub-menu {
    position: absolute;
    top: 100%; left: 0;
    min-width: 170px;
    margin: 0; padding: 6px;
    list-style: none;
    background: var(--upv-surface);
    border: 1px solid var(--upv-border);
    border-radius: var(--upv-radius);
    box-shadow: var(--upv-shadow-hover);
    opacity: 0;
    visibility: hidden;
    transform: translateY(8px);
    transition: all .2s ease;
    z-index: 50;
}
.upv-menu .menu-item-has-children:hover > .sub-menu,
.upv-menu .menu-item-has-children:focus-within > .sub-menu {
    opacity: 1; visibility: visible; transform: translateY(0);
}
.upv-menu .sub-menu a { white-space: nowrap; }

.upv-header__actions { display: flex; align-items: center; gap: 6px; }
.upv-icon-btn {
    display: inline-flex;
    align-items: center; justify-content: center;
    width: 38px; height: 38px;
    border: none;
    border-radius: 50%;
    background: transparent;
    color: var(--upv-text-2);
    transition: all .2s ease;
}
.upv-icon-btn:hover { background: var(--upv-surface-2); color: var(--upv-primary); }
.upv-nav-toggle { display: none; }

/* 暗色模式图标切换 */
.upv-icon-sun { display: none; }
[data-theme="dark"] .upv-icon-sun { display: block; }
[data-theme="dark"] .upv-icon-moon { display: none; }

/* 搜索栏 */
.upv-search-bar {
    border-top: 1px solid var(--upv-border);
    background: var(--upv-surface);
    padding: 12px 0;
}
.upv-search-form {
    display: flex;
    align-items: center;
    max-width: 560px;
    margin-inline: auto;
    border: 1.5px solid var(--upv-border);
    border-radius: 999px;
    background: var(--upv-surface);
    overflow: hidden;
    transition: border-color .2s ease;
}
.upv-search-form:focus-within { border-color: var(--upv-primary); }
.upv-search-form__input {
    flex: 1;
    border: none;
    outline: none;
    padding: 10px 20px;
    background: transparent;
    color: var(--upv-text);
    font-size: 14px;
}
.upv-search-form__btn {
    display: inline-flex;
    align-items: center; justify-content: center;
    width: 48px; height: 40px;
    border: none;
    background: var(--upv-primary);
    color: #fff;
}
.upv-search-form__btn:hover { background: var(--upv-primary-dark); }

/* ---------- 5. 轮播 ---------- */
.upv-hero { padding: 20px 0 8px; }
.upv-hero__viewport {
    position: relative;
    border-radius: var(--upv-radius);
    overflow: hidden;
    box-shadow: var(--upv-shadow);
    aspect-ratio: 21 / 9;
    max-height: 460px;
}
.upv-hero__slide {
    position: absolute;
    inset: 0;
    opacity: 0;
    visibility: hidden;
    transition: opacity .6s ease;
}
.upv-hero__slide.is-active { opacity: 1; visibility: visible; z-index: 1; }
.upv-hero__img { width: 100%; height: 100%; object-fit: cover; display: block; }
.upv-hero__slide::after {
    content: "";
    position: absolute; inset: 0;
    background: linear-gradient(180deg, transparent 40%, rgba(0, 0, 0, .78));
}
.upv-hero__caption {
    position: absolute;
    left: 24px; right: 24px; bottom: 20px;
    z-index: 2;
    color: #fff;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
}
.upv-hero__title { font-size: 22px; font-weight: 700; color: #fff; text-shadow: 0 2px 8px rgba(0,0,0,.4); }
.upv-hero__title:hover { color: #fff; }
.upv-hero__excerpt {
    font-size: 13px;
    color: rgba(255, 255, 255, .85);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}
.upv-hero__arrow {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    z-index: 5;
    width: 40px; height: 40px;
    border: none;
    border-radius: 50%;
    background: rgba(0, 0, 0, .35);
    color: #fff;
    font-size: 24px;
    line-height: 1;
    opacity: 0;
    transition: opacity .2s ease;
}
.upv-hero:hover .upv-hero__arrow { opacity: 1; }
.upv-hero__arrow--prev { left: 14px; }
.upv-hero__arrow--next { right: 14px; }
.upv-hero__dots {
    position: absolute;
    right: 20px; bottom: 16px;
    z-index: 5;
    display: flex;
    gap: 6px;
}
.upv-hero__dot {
    width: 8px; height: 8px;
    border: none;
    border-radius: 999px;
    background: rgba(255, 255, 255, .45);
    padding: 0;
    transition: all .25s ease;
}
.upv-hero__dot.is-active { width: 20px; background: #fff; }

/* ---------- 6. 卡片网格 ---------- */
.upv-card-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px 16px;
}
.upv-card-grid--compact { grid-template-columns: repeat(3, 1fr); }

.upv-card {
    background: var(--upv-surface);
    border-radius: var(--upv-radius);
    box-shadow: var(--upv-shadow);
    overflow: hidden;
    transition: transform .25s ease, box-shadow .25s ease;
}
.upv-card:hover { transform: translateY(-3px); box-shadow: var(--upv-shadow-hover); }

.upv-card__thumb {
    position: relative;
    display: block;
    aspect-ratio: 16 / 9;
    overflow: hidden;
    background: var(--upv-surface-2);
}
.upv-card__thumb img { width: 100%; height: 100%; object-fit: cover; transition: transform .4s ease; }
.upv-card:hover .upv-card__thumb img { transform: scale(1.05); }
.upv-card__thumb-fallback {
    display: flex; align-items: center; justify-content: center;
    width: 100%; height: 100%;
    color: var(--upv-text-3);
}
.upv-card__play {
    position: absolute;
    inset: 0;
    display: flex; align-items: center; justify-content: center;
    background: rgba(0, 0, 0, .18);
    color: #fff;
    opacity: 0;
    transition: opacity .25s ease;
}
.upv-card__play svg {
    width: 46px; height: 46px;
    padding: 10px;
    border-radius: 50%;
    background: rgba(0, 0, 0, .55);
}
.upv-card:hover .upv-card__play { opacity: 1; }
.upv-card__duration {
    position: absolute;
    right: 8px; bottom: 8px;
    padding: 1px 7px;
    border-radius: 4px;
    background: rgba(0, 0, 0, .68);
    color: #fff;
    font-size: 12px;
    font-variant-numeric: tabular-nums;
}
.upv-card__count {
    position: absolute;
    left: 8px; bottom: 8px;
    padding: 1px 8px;
    border-radius: 4px;
    background: rgba(0, 0, 0, .68);
    color: #fff;
    font-size: 12px;
}
.upv-card__body { padding: 12px 14px 14px; }
.upv-card__title {
    margin: 0 0 8px;
    font-size: 15px;
    font-weight: 600;
    line-height: 1.45;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}
.upv-card__excerpt {
    margin: 0 0 8px;
    font-size: 13px;
    color: var(--upv-text-2);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}
.upv-card__meta {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 4px 14px;
    font-size: 12px;
    color: var(--upv-text-3);
}
.upv-meta-item { display: inline-flex; align-items: center; gap: 4px; }
.upv-meta-item svg { opacity: .7; }
.upv-meta-item--cat { color: var(--upv-text-3); }
.upv-meta-item--cat:hover { color: var(--upv-primary); }

/* ---------- 7. 分类入口 ---------- */
.upv-cat-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
}
.upv-cat-card {
    position: relative;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    min-height: 110px;
    padding: 16px;
    border-radius: var(--upv-radius);
    overflow: hidden;
    color: #fff;
    background: linear-gradient(135deg, var(--upv-primary), #33c6ec);
    transition: transform .25s ease, box-shadow .25s ease;
}
.upv-cat-card:hover { transform: translateY(-3px); box-shadow: var(--upv-shadow-hover); color: #fff; }
.upv-cat-card__bg {
    position: absolute; inset: 0;
    width: 100%; height: 100%;
    object-fit: cover;
}
.upv-cat-card__mask { position: absolute; inset: 0; background: linear-gradient(180deg, rgba(0,0,0,.1), rgba(0,0,0,.6)); }
.upv-cat-card__name { position: relative; font-size: 17px; font-weight: 700; }
.upv-cat-card__count { position: relative; font-size: 12px; opacity: .85; }

/* ---------- 8. 归档头部 / 筛选 ---------- */
.upv-archive-head { margin-bottom: 20px; }
.upv-archive-head__title { font-size: 24px; margin-bottom: 6px; }
.upv-archive-head__desc { color: var(--upv-text-2); font-size: 14px; }

.upv-filter-tabs {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    margin-bottom: 20px;
}
.upv-filter-tab {
    padding: 6px 16px;
    border: 1px solid var(--upv-border);
    border-radius: 999px;
    background: var(--upv-surface);
    font-size: 13px;
    color: var(--upv-text-2);
    transition: all .2s ease;
}
.upv-filter-tab:hover { color: var(--upv-primary); border-color: var(--upv-primary); }
.upv-filter-tab.is-active {
    background: var(--upv-primary);
    border-color: var(--upv-primary);
    color: #fff;
    font-weight: 600;
}

/* ---------- 9. 面包屑 / 分页 ---------- */
.upv-breadcrumbs {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 14px;
    font-size: 13px;
    color: var(--upv-text-3);
}
.upv-breadcrumbs a { color: var(--upv-text-3); }
.upv-breadcrumbs a:hover { color: var(--upv-primary); }
.upv-breadcrumbs__current { color: var(--upv-text-2); }
.upv-breadcrumbs__sep { opacity: .6; }

.upv-pagination, .navigation.pagination {
    margin-top: 28px;
}
.upv-pagination .page-numbers,
.navigation.pagination .page-numbers {
    display: inline-flex;
    align-items: center; justify-content: center;
    min-width: 38px; height: 38px;
    margin-right: 6px;
    padding: 0 10px;
    border: 1px solid var(--upv-border);
    border-radius: var(--upv-radius-sm);
    background: var(--upv-surface);
    font-size: 14px;
    color: var(--upv-text-2);
}
.upv-pagination .page-numbers:hover,
.navigation.pagination .page-numbers:hover { border-color: var(--upv-primary); color: var(--upv-primary); }
.upv-pagination .page-numbers.current,
.navigation.pagination .page-numbers.current {
    background: var(--upv-primary);
    border-color: var(--upv-primary);
    color: #fff;
    font-weight: 600;
}

/* ---------- 10. 详情页 ---------- */
.upv-single__title { font-size: 26px; margin-bottom: 12px; }
.upv-single__meta {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 6px 18px;
    margin-bottom: 18px;
    font-size: 13px;
    color: var(--upv-text-3);
}
.upv-meta-item--author img { border-radius: 50%; }
.upv-meta-item--author a { color: var(--upv-text-2); font-weight: 500; }
.upv-single__hero { margin: 0 0 20px; border-radius: var(--upv-radius); overflow: hidden; }

.upv-single__actions {
    display: flex;
    gap: 10px;
    margin: 16px 0;
}

.upv-entry { font-size: var(--upv-font-size); line-height: 1.85; }
.upv-entry > * { margin-bottom: 1.2em; }
.upv-entry h2, .upv-entry h3 { margin-top: 1.6em; }
.upv-entry img { border-radius: var(--upv-radius); }
.upv-entry blockquote {
    margin-inline: 0;
    padding: 12px 20px;
    border-left: 4px solid var(--upv-primary);
    background: var(--upv-surface);
    border-radius: 0 var(--upv-radius) var(--upv-radius) 0;
    color: var(--upv-text-2);
}
.upv-entry pre {
    padding: 16px;
    border-radius: var(--upv-radius);
    background: var(--upv-surface-2);
    overflow-x: auto;
    font-size: 14px;
}
.upv-entry code { background: var(--upv-surface-2); padding: 2px 6px; border-radius: 4px; font-size: .92em; }
.upv-entry table { width: 100%; border-collapse: collapse; }
.upv-entry th, .upv-entry td { border: 1px solid var(--upv-border); padding: 8px 12px; }
.upv-entry a { color: var(--upv-primary); text-decoration: underline; text-underline-offset: 3px; }

.upv-anchor {
    margin-left: 6px;
    opacity: 0;
    font-size: .8em;
    color: var(--upv-primary);
    text-decoration: none;
}
h2:hover .upv-anchor, h3:hover .upv-anchor, .upv-anchor:focus { opacity: 1; }

/* 目录 */
.upv-toc {
    margin: 0 0 24px;
    padding: 14px 18px;
    border: 1px solid var(--upv-border);
    border-radius: var(--upv-radius);
    background: var(--upv-surface);
}
.upv-toc__toggle {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    border: none;
    background: none;
    padding: 0;
    font-size: 15px;
    font-weight: 700;
    color: var(--upv-text);
}
.upv-toc__list {
    margin: 10px 0 0;
    padding-left: 0;
    list-style: none;
    display: grid;
    gap: 4px;
}
.upv-toc__list.is-collapsed { display: none; }
.upv-toc__item a { font-size: 14px; color: var(--upv-text-2); }
.upv-toc__item a:hover { color: var(--upv-primary); }
.upv-toc__item--h3 { padding-left: 18px; }
.upv-toc__item.is-current a { color: var(--upv-primary); font-weight: 600; }

/* 标签 */
.upv-tags { display: flex; flex-wrap: wrap; gap: 8px; margin: 20px 0; }
.upv-tag {
    padding: 4px 12px;
    border-radius: 999px;
    background: var(--upv-surface);
    border: 1px solid var(--upv-border);
    font-size: 13px;
    color: var(--upv-text-2);
    transition: all .2s ease;
}
.upv-tag:hover { border-color: var(--upv-primary); color: var(--upv-primary); }

/* ---------- 11. 播放器 ---------- */
.upv-player-wrap { margin-bottom: 20px; }
.upv-player {
    position: relative;
    aspect-ratio: 16 / 9;
    border-radius: var(--upv-radius);
    overflow: hidden;
    background: #000;
    box-shadow: var(--upv-shadow);
}
.upv-player iframe, .upv-player video {
    width: 100%; height: 100%;
    border: 0; display: block;
}
.upv-player__poster {
    position: absolute; inset: 0;
    width: 100%; height: 100%;
    object-fit: cover;
}
.upv-player__poster--empty { background: linear-gradient(135deg, #232527, #3a3d42); }
.upv-player__btn {
    position: absolute;
    top: 50%; left: 50%;
    transform: translate(-50%, -50%);
    display: flex; align-items: center; justify-content: center;
    width: 72px; height: 72px;
    border: none;
    border-radius: 50%;
    background: rgba(0, 161, 214, .92);
    color: #fff;
    box-shadow: 0 6px 24px rgba(0, 0, 0, .35);
    transition: transform .2s ease, background .2s ease;
}
.upv-player__btn:hover { transform: translate(-50%, -50%) scale(1.08); background: var(--upv-primary); }
.upv-player__badge {
    position: absolute;
    right: 12px; top: 12px;
    padding: 2px 10px;
    border-radius: 4px;
    background: rgba(0, 0, 0, .55);
    color: #fff;
    font-size: 12px;
}
.upv-player--empty {
    display: flex; align-items: center; justify-content: center;
    background: var(--upv-surface-2);
    color: var(--upv-text-3);
    font-size: 14px;
}

/* ---------- 12. 作者卡片 / 作者英雄区 ---------- */
.upv-author-card {
    display: flex;
    align-items: center;
    gap: 16px;
    margin: 28px 0;
    padding: 18px 20px;
    border: 1px solid var(--upv-border);
    border-radius: var(--upv-radius);
    background: var(--upv-surface);
}
.upv-author-card__avatar { border-radius: 50%; flex: 0 0 auto; }
.upv-author-card__main { flex: 1; min-width: 0; }
.upv-author-card__name { font-size: 16px; }
.upv-author-card__title { font-size: 12px; color: var(--upv-primary); margin-left: 8px; }
.upv-author-card__bio {
    margin: 6px 0 0;
    font-size: 13px;
    color: var(--upv-text-2);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}
.upv-author-card__actions { display: flex; gap: 8px; flex: 0 0 auto; }

.upv-author-hero {
    background: var(--upv-surface);
    border-bottom: 1px solid var(--upv-border);
    padding: 32px 0;
    margin-bottom: 24px;
}
.upv-author-hero__inner { display: flex; align-items: center; gap: 20px; }
.upv-author-hero__avatar { border-radius: 50%; flex: 0 0 auto; }
.upv-author-hero__name { margin: 0; font-size: 24px; }
.upv-author-hero__title { margin: 2px 0 0; color: var(--upv-primary); font-size: 14px; }
.upv-author-hero__bio { margin: 8px 0 0; color: var(--upv-text-2); font-size: 14px; }
.upv-author-hero__stats { display: flex; gap: 18px; margin-top: 10px; font-size: 13px; color: var(--upv-text-3); }

/* ---------- 13. 相关推荐 / 上下篇 / 合集 ---------- */
.upv-related { margin-top: 28px; }
.upv-post-nav {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-top: 28px;
}
.upv-post-nav__link {
    padding: 14px 18px;
    border: 1px solid var(--upv-border);
    border-radius: var(--upv-radius);
    background: var(--upv-surface);
    transition: border-color .2s ease;
}
.upv-post-nav__link:hover { border-color: var(--upv-primary); }
.upv-post-nav__link--next { text-align: right; }
.upv-post-nav__dir { display: block; font-size: 12px; color: var(--upv-text-3); margin-bottom: 4px; }
.upv-post-nav__title {
    font-size: 14px;
    font-weight: 600;
    display: -webkit-box;
    -webkit-line-clamp: 1;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.upv-collection-box {
    margin-top: 28px;
    padding: 18px 20px;
    border: 1px solid var(--upv-border);
    border-radius: var(--upv-radius);
    background: var(--upv-surface);
}
.upv-collection-box__head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 14px;
}
.upv-collection-box__title { margin: 0; font-size: 17px; }

.upv-collection-hero {
    background: var(--upv-surface);
    border-bottom: 1px solid var(--upv-border);
    padding: 28px 0;
    margin-bottom: 24px;
}
.upv-collection-hero__inner { display: flex; gap: 24px; align-items: center; }
.upv-collection-hero__cover { flex: 0 0 280px; border-radius: var(--upv-radius); overflow: hidden; box-shadow: var(--upv-shadow); }
.upv-collection-hero__title { margin: 8px 0; font-size: 26px; }
.upv-collection-hero__desc { margin: 0; color: var(--upv-text-2); font-size: 14px; }

/* ---------- 14. 评论 ---------- */
.upv-comments {
    margin-top: 28px;
    padding-top: 22px;
    border-top: 1px solid var(--upv-border);
}
.upv-comments__title { font-size: 19px; }
.upv-comments__list {
    margin: 0 0 20px;
    padding: 0;
    list-style: none;
}
.upv-comment { padding: 16px 0; border-bottom: 1px solid var(--upv-border); }
.upv-comment .children { list-style: none; margin: 16px 0 0; padding-left: 40px; }
.upv-comment__body { display: flex; gap: 12px; }
.upv-comment__avatar img { border-radius: 50%; }
.upv-comment__main { flex: 1; min-width: 0; }
.upv-comment__head { display: flex; align-items: center; gap: 10px; margin-bottom: 6px; font-size: 13px; }
.upv-comment__author { font-weight: 600; }
.upv-comment__author a { font-style: normal; }
.upv-comment__date { color: var(--upv-text-3); }
.upv-comment__await { color: var(--upv-accent); }
.upv-comment__content { font-size: 14px; }
.upv-comment__content p { margin: 0 0 8px; }
.comment-reply-link { font-size: 12px; color: var(--upv-text-3); }
.comment-reply-link:hover { color: var(--upv-primary); }

.upv-comments .comment-form {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 14px;
    padding: 18px;
    border: 1px solid var(--upv-border);
    border-radius: var(--upv-radius);
    background: var(--upv-surface);
}
.upv-comments .comment-form-comment,
.upv-comments .comment-form-cookies-consent,
.upv-comments .form-submit { grid-column: 1 / -1; }
.upv-comments .comment-form label { display: block; font-size: 13px; font-weight: 600; margin-bottom: 4px; }
.upv-comments .comment-form input[type=text],
.upv-comments .comment-form input[type=email],
.upv-comments .comment-form input[type=url],
.upv-comments .comment-form textarea {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid var(--upv-border);
    border-radius: var(--upv-radius-sm);
    background: var(--upv-bg);
    color: var(--upv-text);
    font-family: inherit;
    font-size: 14px;
}
.upv-comments .comment-form input:focus, .upv-comments .comment-form textarea:focus {
    outline: none;
    border-color: var(--upv-primary);
}
.upv-comments .form-submit { margin: 0; }
.upv-comments .comment-form .upv-btn { border: none; }

/* ---------- 15. 侧边栏小工具 ---------- */
.upv-sidebar .upv-widget {
    margin-bottom: 20px;
    padding: 18px;
    border-radius: var(--upv-radius);
    background: var(--upv-surface);
    box-shadow: var(--upv-shadow);
}
.upv-widget__title {
    margin: 0 0 14px;
    padding-left: 10px;
    border-left: 3px solid var(--upv-primary);
    font-size: 15px;
    font-weight: 700;
}
.upv-widget ul { margin: 0; padding: 0; list-style: none; }
.upv-widget li { padding: 6px 0; font-size: 14px; }
.upv-widget select, .upv-widget .search-field {
    width: 100%;
    padding: 8px 12px;
    border: 1px solid var(--upv-border);
    border-radius: var(--upv-radius-sm);
    background: var(--upv-bg);
    color: var(--upv-text);
    font-size: 14px;
}

.upv-widget-video-list li a { display: flex; align-items: center; gap: 10px; }
.upv-widget-video-list__title {
    flex: 1;
    display: -webkit-box;
    -webkit-line-clamp: 1;
    -webkit-box-orient: vertical;
    overflow: hidden;
    font-size: 13px;
}
.upv-rank {
    flex: 0 0 auto;
    width: 20px; height: 20px;
    display: inline-flex; align-items: center; justify-content: center;
    border-radius: 4px;
    background: var(--upv-surface-2);
    font-size: 12px;
    font-style: normal;
    color: var(--upv-text-3);
}
.upv-rank--1, .upv-rank--2, .upv-rank--3 { background: var(--upv-accent); color: #fff; }

.upv-social { display: flex; flex-wrap: wrap; gap: 8px 18px; margin: 0; padding: 0; list-style: none; }
.upv-social a { display: inline-flex; align-items: center; gap: 6px; font-size: 13px; color: var(--upv-text-2); }
.upv-social a:hover { color: var(--upv-primary); }

.upv-newsletter { display: flex; flex-direction: column; gap: 10px; }
.upv-newsletter input {
    padding: 10px 14px;
    border: 1px solid var(--upv-border);
    border-radius: var(--upv-radius-sm);
    background: var(--upv-bg);
    color: var(--upv-text);
}

/* ---------- 16. 广告位 ---------- */
.upv-ad {
    margin: var(--upv-ad-gap) auto;
    max-width: 100%;
    text-align: center;
    line-height: 0;
}
.upv-ad > * { line-height: normal; }
.upv-ad img, .upv-ad iframe, .upv-ad ins { max-width: 100%; }
.upv-ad__placeholder {
    display: flex; align-items: center; justify-content: center;
    min-height: 90px;
    padding: 16px;
    border: 1.5px dashed var(--upv-border);
    border-radius: var(--upv-radius);
    background: var(--upv-surface);
    color: var(--upv-text-3);
    font-size: 12px;
    line-height: 1.6;
}

/* 设备控制（配合缓存插件整页缓存：PHP 判断 + CSS 双重控制） */
.upv-ad[data-device="desktop"] { display: block; }
.upv-ad[data-device="mobile"] { display: none; }

/* 移动端底部悬浮（默认隐藏，仅移动端断点显示） */
.upv-ad--mobile_sticky {
    display: none;
    position: fixed;
    left: 0; right: 0; bottom: 0;
    z-index: 90;
    margin: 0;
    padding: 8px 8px calc(8px + env(safe-area-inset-bottom));
    background: var(--upv-surface);
    border-top: 1px solid var(--upv-border);
    box-shadow: 0 -4px 16px rgba(0, 0, 0, .12);
}
.upv-ad--mobile_sticky .upv-ad__close {
    position: absolute;
    top: -14px; right: 10px;
    width: 26px; height: 26px;
    border: none;
    border-radius: 50%;
    background: var(--upv-text);
    color: var(--upv-surface);
    font-size: 13px;
    line-height: 1;
}

/* 弹窗广告（默认隐藏，由 JS 按频率控制展示） */
.upv-ad--popup_overlay {
    display: none;
    position: fixed;
    inset: 0;
    z-index: 120;
    align-items: center;
    justify-content: center;
    padding: 20px;
    background: rgba(0, 0, 0, .55);
}
.upv-ad--popup_overlay.is-shown { display: flex; }
.upv-ad--popup_overlay .upv-popup-box {
    position: relative;
    max-width: min(560px, 92vw);
    max-height: 86vh;
    overflow: auto;
    border-radius: var(--upv-radius);
    background: var(--upv-surface);
    box-shadow: var(--upv-shadow-hover);
}
.upv-ad--popup_overlay .upv-ad__close {
    position: absolute;
    top: -12px; right: -12px;
    width: 30px; height: 30px;
    border: none;
    border-radius: 50%;
    background: var(--upv-text);
    color: var(--upv-surface);
    font-size: 14px;
    z-index: 2;
}
.upv-ad--popup_overlay.is-hidden { display: none !important; }

/* ---------- 17. 弹窗（打赏等通用 Modal） ---------- */
.upv-modal {
    position: fixed;
    inset: 0;
    z-index: 130;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}
.upv-modal[hidden] { display: none; }
.upv-modal__overlay {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, .55);
}
.upv-modal__box {
    position: relative;
    width: min(420px, 92vw);
    padding: 26px;
    border-radius: var(--upv-radius);
    background: var(--upv-surface);
    box-shadow: var(--upv-shadow-hover);
    text-align: center;
    animation: upv-pop .25s ease;
}
@keyframes upv-pop {
    from { transform: scale(.92); opacity: 0; }
    to { transform: scale(1); opacity: 1; }
}
.upv-modal__title { margin: 0 0 8px; font-size: 19px; }
.upv-modal__desc { margin: 0 0 18px; font-size: 13px; color: var(--upv-text-2); }
.upv-modal__close {
    position: absolute;
    top: 10px; right: 12px;
    border: none;
    background: none;
    font-size: 16px;
    color: var(--upv-text-3);
}
.upv-modal__qrs { display: flex; gap: 20px; justify-content: center; }
.upv-qr { margin: 0; }
.upv-qr img {
    width: 150px; height: 150px;
    border: 1px solid var(--upv-border);
    border-radius: var(--upv-radius-sm);
    object-fit: cover;
}
.upv-qr figcaption { margin-top: 8px; font-size: 13px; color: var(--upv-text-2); }

/* ---------- 18. 关于 / 联系页 ---------- */
.upv-about-hero {
    display: flex;
    align-items: center;
    gap: 20px;
    flex-wrap: wrap;
    padding: 22px 24px;
    border-radius: var(--upv-radius);
    background: var(--upv-surface);
    box-shadow: var(--upv-shadow);
    margin-bottom: 24px;
}
.upv-about-hero__avatar { border-radius: 50%; }
.upv-about-hero__name { margin: 0; font-size: 24px; }
.upv-about-hero__title { margin: 2px 0 0; color: var(--upv-primary); font-size: 14px; }
.upv-about-hero__social { margin-left: auto; }

.upv-contact-form {
    display: grid;
    gap: 14px;
    padding: 20px;
    border-radius: var(--upv-radius);
    background: var(--upv-surface);
    box-shadow: var(--upv-shadow);
}
.upv-form-row { margin: 0; display: grid; gap: 6px; }
.upv-form-row label { font-size: 13px; font-weight: 600; }
.upv-form-row input, .upv-form-row textarea {
    padding: 10px 14px;
    border: 1px solid var(--upv-border);
    border-radius: var(--upv-radius-sm);
    background: var(--upv-bg);
    color: var(--upv-text);
    font-family: inherit;
    font-size: 14px;
}
.upv-form-row input:focus, .upv-form-row textarea:focus {
    outline: none;
    border-color: var(--upv-primary);
}
.upv-contact__wechat { margin-top: 24px; text-align: center; }
.upv-contact__wechat img { border-radius: var(--upv-radius); border: 1px solid var(--upv-border); }

.upv-notice {
    padding: 12px 16px;
    border-radius: var(--upv-radius-sm);
    font-size: 14px;
}
.upv-notice--success { background: #e8f7ee; color: #1a7f3c; }
.upv-notice--error { background: #fdecec; color: #c0392b; }
[data-theme="dark"] .upv-notice--success { background: #14301f; color: #6fcf97; }
[data-theme="dark"] .upv-notice--error { background: #3a1a1a; color: #f38b83; }

/* ---------- 19. 页脚 ---------- */
.upv-footer {
    margin-top: 40px;
    padding: 36px 0 24px;
    background: var(--upv-surface);
    border-top: 1px solid var(--upv-border);
}
.upv-footer__widgets { margin-bottom: 28px; }
.upv-footer__widgets .upv-widget { margin-bottom: 0; padding: 0; background: transparent; box-shadow: none; }
.upv-footer__bottom {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 12px;
    padding-top: 20px;
    border-top: 1px solid var(--upv-border);
    font-size: 13px;
    color: var(--upv-text-3);
}
.upv-footer__powered { margin-left: 10px; opacity: .6; }

/* ---------- 20. 404 / 空状态 ---------- */
.upv-404 { text-align: center; padding: 60px 0; }
.upv-404__code {
    font-size: 96px;
    font-weight: 800;
    line-height: 1;
    background: linear-gradient(135deg, var(--upv-primary), var(--upv-accent));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}
.upv-404__title { font-size: 22px; margin: 12px 0 6px; }
.upv-404__desc { color: var(--upv-text-2); margin-bottom: 20px; }
.upv-404__search { max-width: 480px; margin: 0 auto 24px; }
.upv-404__hot { margin-top: 48px; text-align: left; }

.upv-none { text-align: center; padding: 56px 0; }
.upv-none__icon { font-size: 42px; margin: 0 0 8px; }
.upv-none__title { font-size: 19px; }
.upv-none__desc { color: var(--upv-text-2); margin-bottom: 18px; }

/* ---------- 21. WordPress 核心兼容 ---------- */
.alignwide { margin-left: calc(-100vw / 2 + 100% / 2); margin-right: calc(-100vw / 2 + 100% / 2); }
.alignfull { width: 100vw; max-width: 100vw; margin-left: calc(50% - 50vw); }
.wp-caption { max-width: 100%; }
.sticky { /* 无特殊样式，置顶由推荐模块承担 */ }
.bypostauthor { outline: 2px solid var(--upv-primary); outline-offset: 2px; border-radius: var(--upv-radius-sm); }
.gallery-caption { font-size: 13px; color: var(--upv-text-3); }

/* Gutenberg 区块颜色类 */
.has-primary-color { color: var(--upv-primary); }
.has-accent-color { color: var(--upv-accent); }
.has-primary-background-color { background-color: var(--upv-primary); }
.has-accent-background-color { background-color: var(--upv-accent); }

/* 返回顶部 */
.upv-back-top {
    position: fixed;
    right: 20px; bottom: 20px;
    z-index: 80;
    width: 42px; height: 42px;
    border: none;
    border-radius: 50%;
    background: var(--upv-surface);
    color: var(--upv-text-2);
    box-shadow: var(--upv-shadow-hover);
    opacity: 0;
    visibility: hidden;
    transition: all .25s ease;
}
.upv-back-top.is-visible { opacity: 1; visibility: visible; }
.upv-back-top:hover { color: var(--upv-primary); transform: translateY(-2px); }