/* ============================================================
   2026 可持续全球领导者大会 · PC 页面样式
   参数全部取自 ESG专题首页.psd(1920×8955)实测值
   内容区:1500px(x210-1710)
   颜色:标题绿 #009600 / 品牌绿 #3DB63D / CTA #00BB0C
        简介绿 rgba(0,159,0,.92) / 嘉宾绿 #10AD2C / 页脚 #3E753B
        深色文字 #4B524B
   彩虹条:金 #DCA63A 青 #27BDE2 橙红 #FF3A20 绿 #009F01
          朱红 #E5233B 藏青 #1A486A 品红 #DD1367
   ============================================================ */

:root {
  --green: #00A300;
  --green-text: #3DB63D;
  --green-cta: #00BB0C;
  --green-title: #009600;
  --green-speakers: #10AD2C;
  --green-footer: #3E753B;
  --ink: #4B524B;
  --line: rgba(0, 0, 0, .1);
  --bg-soft: #F3F3F3;
  --bg-tint: #E4E6E3;
  --bg-partners: #ECEEEB;
  --rainbow: linear-gradient(90deg,
    #DCA63A 0 14.25%, #27BDE2 14.25% 28.5%, #FF3A20 28.5% 42.75%, #009F01 42.75% 57%,
    #E5233B 57% 71.25%, #1A486A 71.25% 85.5%, #DD1367 85.5% 100%);
  --header-h: clamp(64px, 5.2083vw, 100px);  /* PSD 实测 100px @1920,随视口等比缩小 */
  --font: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: var(--header-h); }
body { font-family: var(--font); color: var(--ink); background: #fff; -webkit-font-smoothing: antialiased; }
img { display: block; }
a { color: inherit; text-decoration: none; transition: color .2s ease; }
button { font-family: inherit; cursor: pointer; border: none; background: none; color: inherit; }
ul { list-style: none; }

.container { width: 1500px; max-width: 94%; margin: 0 auto; min-width: 1400px;}

/* ---------- 入场动效 ---------- */
body.anim .reveal { opacity: 0; transform: translateY(30px); transition: opacity .7s ease, transform .7s ease; }
body.anim .reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  body.anim .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
  .wall-track { animation: none !important; }
}

/* ===================== 头部导航(PSD:0-101) ===================== */
.site-header {
  position: fixed; inset: 0 0 auto 0; z-index: 100; height: var(--header-h);
  background: #202020; transition: box-shadow .3s ease;
}
.site-header.scrolled { box-shadow: 0 6px 24px rgba(0, 0, 0, .45); }
.header-inner {
  width: 1500px; max-width: 94%; height: 100%; margin: 0 auto;
  display: flex; align-items: center;
}
.logo { flex: none; display: flex; align-items: center; }
.logo-img { width: clamp(44px, 3.3854vw, 65px); height: clamp(44px, 3.3854vw, 65px); }

.nav-menu { display: flex; align-items: center; gap: clamp(20px, 2.5vw, 48px); margin-left: auto; }
.nav-link {
  font-size: clamp(13px, 0.9375vw, 18px); color: #fff; padding: 8px 0; white-space: nowrap;
  display: inline-flex; align-items: center; gap: 6px; position: relative;
  transition: color .2s ease;
}
.nav-link:hover { color: var(--green-text); }
.nav-link.active { color: var(--green-text); }
.caret-wrap { position: relative; display: inline-block; width: .95em; height: .65em; vertical-align: baseline; perspective: 200px; }
.caret-ic {
  position: absolute; left: 0; top: 50%; width: .95em; height: auto;
  transform: translateY(-50%) rotateX(0deg);
  /* 参考 inclusionconf.com:0.5s rotateX 翻转;此处白下箭头翻出、绿上箭头翻入 */
  transition: transform .5s ease, opacity .3s ease;
  backface-visibility: hidden;
}
.caret-ic.ic-up { opacity: 0; transform: translateY(-50%) rotateX(180deg); }
/* 下拉项 hover:文字变绿;箭头 rotateX 翻转并换色 */
.nav-item.has-drop:hover .nav-link { color: var(--green-text); }
.nav-item.has-drop:hover .caret-ic.ic-down { opacity: 0; transform: translateY(-50%) rotateX(-180deg); }
.nav-item.has-drop:hover .caret-ic.ic-up { opacity: 1; transform: translateY(-50%) rotateX(0deg); }
.join-ic { width: .9em; height: auto; display: inline-block; }

.nav-item.has-drop { position: relative; }
.dropdown {
  position: absolute; top: calc(100% + 10px); left: 50%; transform: translate(-50%, 8px);
  min-width: 113px; background: #141414; 
  padding: 12px 0; opacity: 0; visibility: hidden;
  transition: opacity .2s ease, transform .2s ease, visibility .2s;
}
.dropdown a { display: block; padding: 8px 12px; font-size: clamp(13px, 0.9375vw, 18px); line-height: 1.5; color: #D5D9D5; white-space: nowrap; text-align: center; }
.dropdown a:hover { color: var(--green-text); }
.nav-item.has-drop:hover .dropdown { opacity: 1; visibility: visible; transform: translate(-50%, 0); }

.btn-join {
  flex: none; margin-left: clamp(20px, 2.5vw, 48px);
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  width: clamp(100px, 7.3958vw, 142px); height: clamp(30px, 2.2396vw, 43px); border-radius: 4px;
  background: var(--green-cta); color: #fff; font-size: clamp(13px, 0.9375vw, 18px);
  transition: filter .2s ease, transform .2s ease;
}
.btn-join:hover { filter: brightness(1.1); }
.btn-join:active { transform: scale(.97); }

/* ===================== 主视觉 KV(PSD:0-953,导航浮于其上) ===================== */
.hero { position: relative; }
.hero-kv { width: 100%; height: auto; }

/* ===================== 通用区块头 ===================== */
.sec-head {
  display: inline-flex; flex-direction: column; align-items: stretch;
  padding: 84px 0 70px;
}
.sec-head .sec-title { align-self: flex-start; }
.sec-title { display: flex; align-items: baseline; gap: 16px; }
.sec-title .en { font-size: 40px; font-weight: 300; letter-spacing: 1px; color: var(--green-title); }
.sec-title .cn { font-size: 40px; font-weight: 700; color: var(--green-title); }
.sec-head.dark .en, .sec-head.dark .cn { color: var(--ink); }
.sec-head.light .en, .sec-head.light .cn { color: #fff; }

/* 标题下彩虹条:宽=标题宽,高 9px(PSD 实测) */
.rainbow-bar { display: block; width: 100%; height: 9px; margin-top: 18px; background: var(--rainbow); }
.rainbow-bar.light { opacity: .45; }

/* 整幅彩虹条(参会嘉宾/页脚顶部,PSD 高 6px) */
.rainbow-strip {
  display: block; height: 6px;
  background: linear-gradient(90deg,
    #DCA63A 0 270px, #27BDE2 270px 540px, #FF3A20 540px 810px, #009F01 810px 1080px,
    #E5233B 1080px 1350px, #1A486A 1350px 1620px, #DD1367 1620px 1890px);
  background-size: 1890px 100%;
}

/* 右侧指纹纹理水印(对应 PSD 大会视频/大会亮点中的大圆环) */
.ring-deco {
  position: absolute; right: -140px; top: 40px; width: 640px; height: 640px;
  border-radius: 50%; pointer-events: none;
  background: repeating-radial-gradient(circle at center, rgba(0, 0, 0, .04) 0 3px, transparent 3px 34px);
}

/* 通用“查看更多”按钮(PSD:404×65,字 24px) */
.sec-more { text-align: center; margin-top: 48px; }
.btn-more {
  width: 404px; height: 65px; border: 2px solid var(--green-text); border-radius: 6px;
  font-size: 24px; color: var(--green-text); background: transparent;
  transition: background .25s ease, color .25s ease;
}
.btn-more:hover { background: var(--green-text); color: #fff; }
.btn-more:active { transform: scale(.98); }
.btn-more.btn-block { width: 100%; margin-top: 41px; }

/* ===================== 大会简介(PSD:760-1133,叠在 KV 底部 193px 上) ===================== */
.overview {
  position: relative; z-index: 1;
  /* 叠压 KV 底部 193px @1920,随视口等比缩放,保证 KV 可见高度比例与设计稿一致 */
  margin-top: calc(-193 / 1920 * 100%);
  background: rgba(0, 159, 0, .92);
  padding-bottom: 64px;
}
.overview .sec-head { padding: 77px 0 36px; }
.overview-body { display: grid; gap: 24px; }
.overview-body p { font-size: 20px; line-height: 2; color: #fff; }

/* ===================== 大会视频(PSD:1129-2089) ===================== */
.video-sec { position: relative; background: var(--bg-tint); padding-bottom: 106px; overflow-x: clip; }
.video-sec .sec-head { padding: 82px 0 86px; }
.video-wrap { display: flex; align-items: flex-start; gap: 31px; }

.vmenu { flex: none; width: 351px; display: flex; flex-direction: column; gap: 33px; }
.vmenu-item {
  width: 100%; height: 72px; border: 1px solid var(--green-text); border-radius: 4px;
  background: #fff; color: var(--green-text); font-size: 26px;
  display: flex; align-items: center; justify-content: center; gap: 12px;
  transition: background .2s ease, color .2s ease;
}
.vmenu-item:hover { background: rgba(61, 182, 61, .08); }
/* 日期箭头:PSD 导出绿色 chevron;展开时 rotateX 翻转(同顶部导航动效) */
.vmenu-arrow {
  display: inline-block; width: 27px; height: 17px; flex: none;
  background: url(../img/vmenu-arrow-close.png) no-repeat center / contain;
  transition: transform .5s ease;
}
.vmenu-group.open .vmenu-arrow { transform: rotateX(180deg); }

.vmenu-sub {
  max-height: 0; overflow: hidden; transition: max-height .35s ease;
  background: var(--green-text); border-radius: 0 0 4px 4px;
}
.vmenu-group.open .vmenu-sub { max-height: 1300px; }
.vmenu-group.open .vmenu-item { border-bottom-left-radius: 0; border-bottom-right-radius: 0; }
.vmenu-sub-item {
  display: block; width: 100%; padding: 15px 0; text-align: center;
  color: #D8E2D8; font-size: 24px; border-top: 1px solid rgba(255, 255, 255, .25);
  transition: background .2s ease, color .2s ease;
}
.vmenu-sub-item:first-child { border-top: none; }
.vmenu-sub-item:hover, .vmenu-sub-item.active { background: rgba(0, 0, 0, .1); color: #fff; }

.vplayer { position: sticky; top: calc(var(--header-h) + 20px); flex: 1; min-width: 0; height: 621px; border-radius: 4px; overflow: hidden; background: #062b14; cursor: pointer; }
.vplayer-poster { width: 100%; height: 100%; object-fit: cover; }

/* ===================== 大会议程(PSD:2087-3030) ===================== */
.agenda { position: relative; background: var(--bg-soft); padding-bottom: 120px; overflow: hidden; }
.agenda .sec-head { padding: 86px 0 51px; }

.day-tabs { display: flex; justify-content: center; gap: 26px; }
.day-tab {
  width: 194px; height: 94px; border: 2px solid var(--green-text); border-radius: 8px;
  background: transparent; color: var(--green-text);
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 8px;
  transition: background .25s ease, color .25s ease, transform .2s ease, box-shadow .25s ease;
}
.day-tab .day-en { font-size: 26px; font-weight: 700; }
.day-tab .day-cn { font-size: 22px; }
.day-tab:hover { transform: translateY(-3px); box-shadow: 0 10px 24px rgba(61, 182, 61, .22); }
.day-tab:active { transform: scale(.97); }
.day-tab.active { background: var(--green-text); color: #fff; box-shadow: 0 10px 24px rgba(61, 182, 61, .3); }

.agenda .day-tabs { margin-bottom: 26px; }

/* 场次(上午/下午) */
.ag-session + .ag-session { margin-top: 48px; }
.ag-session-label { font-size: 36px; font-weight: 700; color: var(--ink); margin: 0 0 22px 76px; }
.ag-slider { position: relative; padding: 0 76px; }
.ag-viewport { overflow: hidden; }
.ag-track { display: flex; gap: 33px; transition: transform .45s ease; will-change: transform; }

/* 左右滑动箭头(PSD:滑动按钮.psd)
   42×81 胶囊,默认灰 #C8CAC8,hover 金 #C1A46C;白色圆头 chevron 由 CSS 绘制 */
.ag-arrow {
  position: absolute; top: 50%; transform: translateY(-50%); z-index: 2;
  width: 42px; height: 81px; border-radius: 21px;
  display: flex; align-items: center; justify-content: center;
  cursor: pointer;
  background-color: #C8CAC8;
  background-repeat: no-repeat;
  background-position: center;
  background-size: 17px 30px;
  transition: background-color .25s ease;
}
.ag-prev { left: 0; }
.ag-next { right: 0; }
/* 原三点箭头图片不再使用(PSD 已改为胶囊按钮),隐藏但保留 DOM 兼容 */
.ag-arrow img { display: none; }
.ag-prev {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 17 30'%3E%3Cpath d='M15.25 2 L1.75 15 L15.25 28' fill='none' stroke='%23fff' stroke-width='3.5' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
}
.ag-next {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 17 30'%3E%3Cpath d='M1.75 2 L15.25 15 L1.75 28' fill='none' stroke='%23fff' stroke-width='3.5' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
}
.ag-arrow:hover { background-color: #C1A46C; }
.forum-card {
  flex: 0 0 428px;
  background: rgba(255, 255, 255, .6); border: 1px solid #E5E5E5; border-radius: 6px;
  padding: 27px 35px 18px;
  display: flex; flex-direction: column;
  transition: transform .25s ease, box-shadow .25s ease;
  animation: cardIn .45s ease both;
}
@keyframes cardIn { from { opacity: 0; transform: translateY(16px); } to { opacity: 1; transform: none; } }
.forum-card:hover { transform: translateY(-6px); box-shadow: 0 16px 40px rgba(0, 0, 0, .1); background: #fff; }
.forum-tag { display: flex; align-items: center; gap: 10px; font-size: 26px; font-weight: 700; color: var(--green-text); }
.forum-tag::before { content: ""; width: 5px; height: 23px; border-radius: 2px; background: #DCA63A; }
.forum-title {
  font-size: 22px; font-weight: 700; color: var(--ink); line-height: 1.5; margin: 31px 0 18px;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
}
.forum-desc {
  font-size: 16px; line-height: 1.5; color: var(--ink); 
  display: -webkit-box; -webkit-line-clamp: 4; -webkit-box-orient: vertical; overflow: hidden;
}
.forum-foot {
  margin-top: 30px; height: 55px; border: 1px solid var(--green-text); border-radius: 6px;
  display: flex; align-items: center; justify-content: space-between; padding: 0 14px;
  font-size: 24px; color: var(--green-text);
}
.forum-hall { display: inline-flex; align-items: center; gap: 6px; }
.forum-hall svg { flex: none; }
.forum-card.filled .forum-foot { background: var(--green-text); color: #fff; border-color: var(--green-text); }

/* ===================== 大会亮点(PSD:3028-4128) ===================== */
.highlights { background: var(--bg-tint); padding-bottom: 120px; }
.highlights .sec-head { padding: 63px 0 72px; }
.hl-wrap { display: flex; gap: 27px; align-items: flex-start; }

.hl-list { flex: none; width: 352px; display: grid; gap: 19px; }
.hl-item {
  min-height: 54px; display: flex; align-items: center; justify-content: center; text-align: center;
  padding: 10px 16px; background: #fff; border: 1px solid #E2E6E2; border-radius: 4px;
  font-size: 22px; color: var(--ink); cursor: pointer; line-height: 1.4;
  transition: background .25s ease, color .25s ease, border-color .25s ease;
}
.hl-item:hover { border-color: var(--green-text); color: var(--green-text); }
.hl-item.active { background: var(--green-text); border-color: var(--green-text); color: #fff; font-weight: 600; }

.hl-stage { flex: 1; min-width: 0; }
.hl-carousel { position: relative; border-radius: 4px; overflow: hidden; }
.hl-slides { position: relative; aspect-ratio: 1104 / 621; }
.hl-slide { position: absolute; inset: 0; opacity: 0; transition: opacity .5s ease; }
.hl-slide.active { opacity: 1; }
.hl-slide img { width: 100%; height: 100%; object-fit: cover; }
/* 分页点:与设计稿一致(激活为长条,其余为圆点),距图底 28px */
.hl-dots {
  position: absolute; left: 50%; bottom: 28px; transform: translateX(-50%);
  display: flex; align-items: center; gap: 10px; z-index: 2;
}
.hl-dot {
  width: 9px; height: 9px; border: none; border-radius: 5px; padding: 0;
  background: rgba(255, 255, 255, .4); cursor: pointer; transition: all .3s ease;
}
.hl-dot.active { width: 20px; background: #fff; }
.hl-title { font-size: 22px; font-weight: 700; color: var(--ink); margin: 20px 0 14px; }
.hl-desc {
  font-size: 16px; line-height: 1.5; color: var(--ink);
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
}

/* ===================== 最新报道(PSD:4126-5035) ===================== */
.news { background: var(--bg-soft); padding-bottom: 120px; }
.news .sec-head { padding: 84px 0 67px; }
.news-list { width: 1122px; max-width: 100%; margin: 0 auto; }
.news-item a { display: flex; gap: 21px; padding-bottom: 11px; margin-bottom: 11px; }
.news-item + .news-item a { border-top: none; }
.news-item a .news-info { border-bottom: 1px solid var(--line); flex: 1; padding-bottom: 20px; }
.news-item:last-child a .news-info { border-bottom: none; }
.news-item a:hover .news-info h3 { color: var(--green-title); }
.news-thumb { width: 198px; height: 112px; object-fit: cover; flex: none; background: #D9D9D9; }
.news-info { display: flex; flex-direction: column; justify-content: center; gap: 12px; }
.news-info h3 {
  font-size: 22px; font-weight: 700; color: var(--ink); line-height: 1.4;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
  transition: color .2s ease;
}
.news-info time { font-size: 16px; color: var(--ink); }

/* ===================== 参会嘉宾(PSD:4886-7448,背景 5033-7116) ===================== */
.speakers { background: var(--green-speakers); }
.speakers .sec-head { padding: 83px 0 115px; }
.speaker-wall {
  position: relative; overflow: hidden;
  display: flex; gap: 16px;
  width: 1500px; max-width: 94%; margin: 0 auto;
  height: 1824px;
}
.wall-col { flex: 1; min-width: 0; overflow: hidden; }
.wall-track {
  display: flex; flex-direction: column; gap: 18px;
  animation: wallScroll linear infinite;
  will-change: transform;
}
.wall-col:nth-child(even) .wall-track { animation-direction: reverse; }
@keyframes wallScroll { from { transform: translateY(0); } to { transform: translateY(-50%); } }
.speaker-wall:hover .wall-track { animation-play-state: paused; }
.wall-fade {
  position: absolute; left: 0; right: 0; bottom: 0; height: 212px; z-index: 2; pointer-events: none;
  background: linear-gradient(180deg, rgba(16, 173, 44, 0), var(--green-speakers) 88%);
}

.speaker-card {
  width: 100%; flex: none; border-radius: 8px; overflow: hidden;
  transition: transform .3s ease, box-shadow .3s ease;
}
.speaker-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 20px 50px rgba(0, 60, 10, .4);
}
.speaker-photo {
  width: 100%; aspect-ratio: 1 / 1; object-fit: cover; background: #ECECEC;
  border-radius: 8px; transition: transform .4s ease;
}
.speaker-card:hover .speaker-photo { transform: scale(1.08); }
.speaker-info {
  position: relative; margin-top: -25px; border-radius: 10px 10px 8px 8px;
  background: var(--green); padding: 18px 17px 16px;
}
.speaker-name { font-size: 28px; font-weight: 700; color: #fff; margin-bottom: 10px; }
.speaker-title {
  font-size: 16px; line-height: 1.25; color: #fff;
  display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden;
}

/* ===================== 合作伙伴(PSD:7113-8253) ===================== */
.partners { background: var(--bg-partners); padding-bottom: 102px; }
.partners .sec-head { padding: 88px 0 66px; }
.tier { display: flex; align-items: center; gap: 60px; margin-top: 45px; }
.tier:first-of-type { margin-top: 0; }
.tier-name { flex: none; width: 177px; font-size: 30px; font-weight: 700; color: var(--ink); line-height: 1.4; }
.tier-grid { display: flex; flex-wrap: wrap; gap: 25px; }
/* 多行网格的层级(如特约合作):层级名与第一行卡片垂直居中对齐,而非相对整个网格居中 */
.tier-first-row { align-items: flex-start; }
.tier-first-row .tier-name { margin-top: 30px; }  /* (卡片高102 - 标题行高30*1.4=42) / 2 */
.logo-card {
  width: 285px; height: 102px; background: #fff; border: 1px solid var(--green-text); border-radius: 4px;
  display: flex; align-items: center; justify-content: center; padding: 18px 24px;
  transition: transform .25s ease, box-shadow .25s ease;
}
.logo-card img { max-width: 100%; max-height: 100%; object-fit: contain; }
.logo-card:hover { transform: translateY(-4px); box-shadow: 0 12px 30px rgba(61, 182, 61, .18); }

/* ===================== 页脚(PSD:8245-8956) ===================== */
.site-footer { background: var(--green-footer); }
.footer-grid { display: flex; gap: 263px; padding: 83px 0 62px; }
.f-social { flex: none; }
.f-social h4, .f-contact h4 { font-size: 32px; font-weight: 700; color: #fff; margin-bottom: 31px; }
.social-icons { display: flex; gap: 10px; margin-bottom: 30px; }
.social-icon { width: 54px; height: 54px; display: block; transition: transform .25s ease, opacity .25s ease; }
.social-icon img { width: 100%; height: 100%; }
.social-icon:hover { transform: translateY(-3px); }
.qr-box { width: 183px; height: 183px; border-radius: 16px; overflow: hidden; background: #fff; }
.qr-box img { width: 100%; height: 100%; object-fit: cover; }

.f-contact { flex: 1; min-width: 0; }
.contact-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px 60px; }
.contact-group h5 { font-size: 18px; font-weight: 700; color: #fff; margin-bottom: 14px; }
.contact-group p { font-size: 18px; color: #fff; line-height: 1.56; }

.footer-bottom {
  background: var(--green); text-align: center; color: #fff;
  padding: 66px 0 70px; font-size: 16px; line-height: 2.4;
}
.footer-bottom .f-links a { padding: 0 14px; }

/* ===================== 右侧悬浮工具条(PSD:50×50,白底常态/绿底激活) ===================== */
.float-bar {
  position: fixed; right: max(24px, calc(50% - 777px)); top: 80%; transform: translateY(-50%); z-index: 90;
  display: flex; flex-direction: column;
}
.float-item {
  width: 50px; height: 50px; cursor: pointer; position: relative; flex: none;
}
.float-item .ic, .float-item .ic-on { position: absolute; inset: 0; width: 100%; height: 100%; transition: opacity .2s ease; }
.float-item .ic-on { opacity: 0; }
.float-item:hover .ic-on { opacity: 1; }
.float-item:hover .ic { opacity: 0; }
.wechat-pop {
  position: absolute; right: 62px; top: 50%; transform: translateY(-50%) translateX(8px);
  width: 140px; background: #fff; border-radius: 8px; padding: 12px;
  box-shadow: 0 8px 30px rgba(0, 0, 0, .18); text-align: center;
  opacity: 0; visibility: hidden; transition: opacity .2s ease, transform .2s ease, visibility .2s;
}
.wechat-pop img { width: 116px; height: 116px; }
.wechat-pop p { font-size: 12px; color: var(--ink); margin-top: 6px; }
.float-wechat:hover .wechat-pop { opacity: 1; visibility: visible; transform: translateY(-50%) translateX(0); }

/* ===================== 响应式(笔记本小屏) ===================== */
@media (max-width: 1560px) {
  .container, .speaker-wall { width: 1200px; }
  .header-inner { width: auto; padding: 0 30px; }
  .vmenu { width: 300px; }
  .vplayer { height: 520px; }
  .forum-title { font-size: 20px; }
  .tier { gap: 30px; }
  .tier-grid { gap: 18px; }
  .footer-grid { gap: 80px; }
}