/* ================================================================
   十方官网 - 100% 还原 Figma 设计稿
   页面顺序（按 Figma y 坐标）：
     1. Header (y:0)
     2. Hero (y:0~820)
     3. 解决方案导航+5大卡片 (y:820~2140)
     4. 我们为谁创造价值 (y:2140~3377)
     5. 以AI为核心驱动·商业闭环 (y:3537~4331)
     6. 四大硬核底层实力 (y:4511~5461)
     7. 合作伙伴 (y:5483~6130)
     8. Footer (y:6130~6650)
   ================================================================ */

/* ---------- Reset ---------- */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
/* 非简体语言时，翻译完成前隐藏正文，避免快速切页时闪烁中文原文（FOUC） */
html.i18n-pending body { visibility: hidden; }
body {
  font-family: -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Microsoft YaHei', 'MiSans VF', 'HarmonyOS Sans SC', sans-serif;
  background: #FDFDFD;
  color: #000;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
a { text-decoration: none; color: inherit; }
img { display: block; max-width: 100%; height: auto; }
button { border: none; background: none; cursor: pointer; font-family: inherit; }

/* ---------- Design Tokens ---------- */
:root {
  --blue: #1C6FFF;
  --white: #FFF;
  --bg: #FDFDFD;
  --tag-bg: rgba(28,111,255,0.06);
  --g-hero: linear-gradient(180deg, #D6E8FF 0%, #FCFCFC 100%);
  --g-card-lg: linear-gradient(180deg, rgba(184,216,255,0.4) 0%, rgba(232,244,255,0.4) 100%);
  --g-card-sm: linear-gradient(180deg, rgba(174,211,255,0.4) 0%, rgba(232,244,255,0.4) 100%);
  --g-blue: linear-gradient(180deg, #F1F8FF 0%, #FCFCFC 100%);
  --g-eco: linear-gradient(180deg, #F1F7FF 0%, #FFF 100%);
  --g-footer: linear-gradient(180deg, #E8EEFF 0%, #F5F7FD 100%);
  --g-btn: linear-gradient(90deg, #1C6FFF 0%, #00DBC5 100%);
}

/* ---------- Shared ---------- */
.section-title {
  font-size: 54px; font-weight: 600; line-height: 76px; color: #000; text-align: center;
}
.section-subtitle {
  font-size: 20px; font-weight: 400; line-height: 30px; color: rgba(0,0,0,0.8); text-align: center; margin-top: 12px;
}
.section-header-center { text-align: center; margin-bottom: 60px; }
.icon-16 { width: 16px; height: 16px; flex-shrink: 0; }
.icon-18 { width: 18px; height: 18px; }
.icon-22 { width: 22px; height: 22px; }
.icon-24 { width: 24px; height: 24px; }
.icon-white { filter: brightness(0) invert(1); }
.btn-primary {
  display: inline-flex; align-items: center; justify-content: center; gap: 10px;
  width: 210px; height: 58px; background: var(--blue); color: #FFF;
  border-radius: 12px; font-size: 16px; font-weight: 400; line-height: 16px;
  transition: background .2s; flex-shrink: 0;
}
.btn-primary:hover { background: #1560E6; }

/* ================================================================
   1. Header（y:0, h:64）
   ================================================================ */
.header {
  position: fixed; top: 0; left: 0; right: 0; height: 64px;
  background: transparent;
  z-index: 1000;
  transition: background .3s, box-shadow .3s, backdrop-filter .3s;
}
.header.scrolled {
  background: rgba(253,253,253,0.92); backdrop-filter: blur(12px);
  box-shadow: 0 1px 20px rgba(0,0,0,0.06);
}
.header-inner {
  max-width: 1380px; height: 100%; margin: 0 auto; padding: 0 20px;
  display: flex; align-items: center; justify-content: space-between;
  position: relative; z-index: 1000;
}
.header-left { display: flex; align-items: center; gap: 6px; }
.logo-link { display: flex; align-items: center; padding: 14px 24px 14px 0; }
.logo-img { width: 86.89px; height: 16px; }
/* 英文 logo（logo-en.svg 305x24）高度 24px 等比缩放 */
:root[data-lang="en"] .logo-img { width: auto; height: 14px; }
.nav-links { display: flex; align-items: center; gap: 16px; padding: 0 60px; }
.nav-item {
  padding: 9px 16px; border-radius: 8px; font-size: 14px; font-weight: 400;
  line-height: 14px; color: rgba(0,0,0,0.6); transition: background .2s, color .2s;
}
.nav-item:hover { background: rgba(0,0,0,0.05); color: #000; }
.nav-item.active { color: #000; background: rgba(0,0,0,0.05); }
.header-right { display: flex; align-items: center; gap: 8px; }
.icon-btn {
  display: flex; align-items: center; justify-content: center; gap: 2px;
  padding: 9px; border-radius: 8px;
  border: 1px solid rgba(0,0,0,0.05); background: transparent;
  transition: background .2s, border-color .2s;
}
.icon-btn:hover { background: rgba(0,0,0,0.05); }
/* 汉堡菜单按钮：仅 ≤640 显示 */
.menu-toggle { display: none; }
/* 移动展开导航：默认全程隐藏，仅 ≤640 且 .open 时显示（防止桌面端泄漏） */
.mobile-nav { display: none; }
.lang-btn span { font-size: 14px; font-weight: 400; line-height: 14px; color: rgba(0,0,0,0.6); }

/* 语言下拉菜单（Figma 192:1135：padding 8、gap 8、当前项浅底） */
/* lang-wrap 固定宽度，不随当前语言文字长短变化；lang-menu open 同宽 */
.lang-wrap { position: relative; width: 100px; flex-shrink: 0; }
.lang-btn { width: 100%; justify-content: center; }
.lang-btn span { flex: 0 1 auto; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.lang-menu {
  position: absolute; top: calc(100% + 8px); left: 0; right: 0; z-index: 1100;
  padding: 8px; border-radius: 8px;
  background: #FFF; border: 1px solid rgba(0,0,0,0.05);
  box-shadow: 0 8px 24px rgba(0,0,0,0.1);
  display: flex; flex-direction: column; gap: 8px;
  opacity: 0; visibility: hidden; transform: translateY(-6px);
  transition: opacity .2s ease, transform .2s ease, visibility .2s ease;
}
.lang-menu.open { opacity: 1; visibility: visible; transform: none; }
.lang-option {
  display: flex; align-items: center; justify-content: center; padding: 8px 9px; border-radius: 6px;
  font-size: 14px; font-weight: 400; line-height: 14px; color: rgba(0,0,0,0.6);
  background: transparent; cursor: pointer; transition: background .2s, color .2s;
  text-align: center; white-space: nowrap;
}
.lang-option:hover { background: rgba(0,0,0,0.04); color: #000; }
.lang-option.active { background: #F6F6F6; color: #000; }

/* ================================================================
   2. Hero（y:0~820）
   ================================================================ */
.hero {
  background: var(--g-hero);
  padding-top: 64px;
  height: 820px;
}
.hero-inner {
  max-width: 1380px; margin: 0 auto; padding: 135px 20px 100px;
  display: flex; align-items: stretch; justify-content: space-between; gap: 40px;
}
.hero-text { max-width: 464px; display: flex; flex-direction: column; flex-shrink: 0; }
.hero-title {
  font-family: -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Microsoft YaHei', 'HarmonyOS Sans SC', 'MiSans VF', sans-serif;
  font-size: 58px; font-weight: 400; line-height: 72px; color: #000;
  margin-bottom: 16px;
}
.t-bold { font-weight: 600; }
.t-blue  { font-weight: 600; color: var(--blue); }
.hero-subtitle { font-size: 20px; font-weight: 500; line-height: 30px; color: rgba(0,0,0,0.8); }
.hero-text .btn-primary { margin-top: auto; }
.hero-visual {
  width: 819px; height: 460px; border-radius: 24px; overflow: hidden; flex-shrink: 0;
  position: relative;
}
.hero-video { width: 100%; height: 100%; object-fit: cover; border-radius: 24px; display: block; }
.video-controls {
  position: absolute; bottom: 20px; left: 20px;
  display: flex; gap: 10px; opacity: 0;
  transition: opacity .3s;
  pointer-events: none;
}
.hero-visual:hover .video-controls {
  opacity: 1;
  pointer-events: auto;
}
.video-btn {
  display: flex; align-items: center; justify-content: center;
  padding: 12px;
  background: rgba(0,0,0,0.6); border-radius: 8px;
  border: none; cursor: pointer;
  transition: background .2s;
}
.video-btn:hover { background: rgba(0,0,0,0.8); }
.video-icon { width: 17px; height: 17px; display: block; }

/* ================================================================
   3. 解决方案导航 + 5大卡片（y:820~2140）
   ================================================================ */
.solutions-section {
  background: #FFF;
  padding: 60px 0 120px;
}

/* 3a. 导航 Tabs */
.sol-tabs-wrap { max-width: 1380px; margin: 0 auto; padding: 0 20px; margin-bottom: 180px; }
.sol-tabs { display: flex; align-items: flex-start; justify-content: space-between; height: 90px; }
.sol-tab { width: 238px; display: flex; flex-direction: column; gap: 12px; padding: 8px 0; cursor: pointer; }
.sol-tab:hover { opacity: 0.8; }
.sol-tab .icon-18 { filter: brightness(0) invert(0.35); }
.sol-tab-head { display: flex; align-items: center; gap: 12px; }
.sol-tab-title { font-size: 18px; font-weight: 500; line-height: 18px; color: #000; }
.sol-tab-desc { font-size: 14px; font-weight: 400; line-height: 22px; color: rgba(0,0,0,0.6); }
.sol-divider {
  width: 0; height: 90px; border-right: 1px solid rgba(0,0,0,0.1);
  flex-shrink: 0; align-self: center;
}

/* 3b. 标题 */
.sol-heading { max-width: 1380px; margin: 0 auto 60px; padding: 0 20px; text-align: center; }

/* 3c. 卡片行 */
.cards-row {
  max-width: 1380px; margin: 0 auto; padding: 0 20px;
  display: flex; gap: 16px; height: 620px;
}

/* 大卡片 */
.card-featured {
  flex: 1; min-width: 0;
  background: transparent; border-radius: 16px; overflow: hidden;
  padding: 36px; position: relative;
  display: flex; flex-direction: column; height: 100%;
}
/* 仅底色做透明度变化：默认 0.4，悬停 1 */
.card-featured::before, .mini-card::before {
  content: ''; position: absolute; inset: 0; z-index: -1;
  background: linear-gradient(180deg, #CEE4FF 0%, #F7FBFF 100%);
  opacity: 0.4; transition: opacity .3s ease;
}
.card-featured:hover::before, .mini-card:hover::before { opacity: 1; }
.card-badge {
  position: absolute; top: 36px; left: 36px;
  width: 42px; height: 42px; background: #000; border-radius: 12px;
  display: flex; align-items: center; justify-content: center; z-index: 2;
}
.card-badge .icon-22 { filter: brightness(0) invert(1); }
.card-platform-img {
  width: 90%; height: 380px; border-radius: 16px;
  overflow: hidden; flex-shrink: 0; align-self: center;
}
.card-platform-img img { width: 100%; height: 100%; object-fit: contain; }
.card-featured-title { margin-top: auto; padding-top: 16px; font-size: 24px; font-weight: 500; line-height: 28px; color: #000; }
.card-featured-desc { font-size: 14px; font-weight: 400; line-height: 22px; color: rgba(0,0,0,0.6); max-width: 339px; padding-top: 12px; }

/* 4个小卡片 */
.cards-mini-group { width: 700px; flex-shrink: 0; display: grid; grid-template-columns: 1fr 1fr; grid-template-rows: 1fr 1fr; gap: 16px; height: 100%; }
.mini-card {
  background: transparent; border-radius: 16px; padding: 36px;
  position: relative; overflow: hidden;
  display: flex; flex-direction: column; gap: 12px; height: 100%;
}
.mini-card-icon {
  width: 42px; height: 42px; background: #000; border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0; aspect-ratio: 1 / 1;
}
.mini-card-icon .icon-22 { filter: brightness(0) invert(1); }
.mini-card-title { margin-top: auto; font-size: 24px; font-weight: 500; line-height: 28px; color: #000; }
.mini-card-desc {
  font-size: 14px; font-weight: 400; line-height: 22px; color: rgba(0,0,0,0.6);
  /* 限定最多 2 行，超出用省略号，避免溢出卡片 */
  display: -webkit-box; -webkit-box-orient: vertical; -webkit-line-clamp: 5;
  overflow: hidden; text-overflow: ellipsis;
}

/* ================================================================
   4. 我们为谁创造价值（y:2140~3377）
   ================================================================ */
.value-section { background: var(--g-blue); padding: 150px 0 100px; }
.value-inner { max-width: 1380px; margin: 0 auto; padding: 0 20px; }
.value-tabs { display: flex; align-items: center; justify-content: center; gap: 64px; margin-top: 60px; }
.value-tab {
  width: 210px; display: flex; flex-direction: column; align-items: center;
  gap: 16px; padding: 20px; border-radius: 12px; cursor: pointer;
  text-align: center;
}
.value-tab-title { font-size: 24px; font-weight: 500; line-height: 28px; color: rgba(0,0,0,0.2); transition: color .2s; }
.value-tab.active .value-tab-title { color: #000; }
.value-tab-desc { font-size: 14px; font-weight: 400; line-height: 22px; color: rgba(0,0,0,0.2); transition: color .2s; }
.value-tab.active .value-tab-desc { color: rgba(0,0,0,0.6); }
.value-divider { width: 0; height: 90px; border-right: 1px solid rgba(0,0,0,0.1); align-self: center; }
/* Tab 面板 */
.tab-panel { display: none; }
.tab-panel.active { display: block; }

/* 横版轮播（品牌/传播） */
.carousel-horizontal {
  display: flex; align-items: center; justify-content: space-between;
  width: 1340px; margin: 0 auto;
}
.carousel-viewport {
  width: 1160px; height: 615px; overflow: hidden; border-radius: 24px; flex-shrink: 0;
}
.carousel-track-h {
  display: flex; transition: transform .4s ease;
}
.video-card-h {
  width: 1160px; height: 615px; flex-shrink: 0; position: relative; overflow: hidden;
}
.video-card-h .value-video { width: 100%; height: 100%; object-fit: cover; display: block; }

/* 竖版轮播（电商/内容） */
.carousel-vertical {
  display: flex; align-items: center; justify-content: space-between;
  width: 1340px; margin: 0 auto;
}
.carousel-viewport-v {
  width: 1112px; height: 615px; overflow: hidden; flex-shrink: 0;
}
.carousel-track-v {
  display: flex; gap: 40px; transition: transform .4s ease;
}
.video-card-v {
  width: 344px; height: 615px; flex-shrink: 0; border-radius: 24px; overflow: hidden; position: relative;
  transition: transform .3s, opacity .3s;
}
.video-card-v .value-video { width: 100%; height: 100%; object-fit: cover; display: block; border-radius: 24px; }

/* 轮播箭头 */
.carousel-arrow {
  width: 42px; height: 42px; flex-shrink: 0; display: flex; align-items: center; justify-content: center;
  background: none; border: none; cursor: pointer; opacity: 1; transition: opacity .2s, transform .2s;
}
.carousel-arrow:hover { transform: scale(1.1); }
.carousel-arrow.disabled { cursor: default; }
.carousel-arrow.disabled:hover { transform: none; }
.carousel-arrow img { width: 42px; height: 42px; }
/* 默认深灰，禁用浅灰 */
.carousel-arrow { filter: brightness(0) invert(0.55); }
.carousel-arrow.disabled { filter: brightness(0) invert(0.85); }

/* 视频播放器控件（价值区） */
.video-controls-v {
  position: absolute; bottom: 24px; left: 24px;
  display: flex; gap: 10px; opacity: 0;
  transition: opacity .3s;
  pointer-events: none;
}
.video-card-h:hover .video-controls-v {
  opacity: 1;
  pointer-events: auto;
}
.video-card-v .video-controls-v {
  display: none;
}
.video-card-v.center .video-controls-v {
  display: flex;
  opacity: 0;
}
.video-card-v.center:hover .video-controls-v {
  opacity: 1;
  pointer-events: auto;
}
.video-btn-v {
  display: flex; align-items: center; justify-content: center;
  padding: 12px;
  background: rgba(0,0,0,0.6); border-radius: 8px;
  border: none; cursor: pointer;
  transition: background .2s;
}
.video-btn-v:hover { background: rgba(0,0,0,0.8); }
.v-icon { width: 17px; height: 17px; display: block; }

/* ================================================================
   5. 以 AI 为核心驱动（y:3537~4331）
   ================================================================ */
.ecosystem-section { padding: 100px 0; background: #FFF; }
.eco-inner { max-width: 1380px; margin: 0 auto; padding: 0 20px; }
.eco-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.eco-card {
  position: relative; min-height: 540px;
  border-radius: 16px; overflow: hidden;
  display: flex; flex-direction: column;
}
/* 仅底色（背景渐变）做透明度变化：默认 0.4，悬停 1 */
.eco-card::before {
  content: ''; position: absolute; inset: 0; z-index: 0;
  background: linear-gradient(180deg, #CEE4FF 0%, #F7FBFF 100%);
  opacity: 0.4; transition: opacity .3s ease;
}
.eco-card:hover::before { opacity: 1; }
.eco-icon {
  position: absolute; top: 32px; left: 32px;
  width: 42px; height: 42px; background: #FFF; border-radius: 12px;
  display: flex; align-items: center; justify-content: center; z-index: 2;
}
.eco-icon .icon-24 { filter: brightness(0) invert(0.35); }
/* 文字改为流式布局：顶部留出图标空间，底部留 30px 与图片间距，内容过长卡片自然加长 */
.eco-card-text {
  position: relative; z-index: 2; padding: 98px 32px 30px;
  display: flex; flex-direction: column; gap: 16px;
}
.eco-card-title { font-size: 24px; font-weight: 500; line-height: 28px; color: #000; }
.eco-card-desc { font-size: 14px; font-weight: 400; line-height: 22px; color: rgba(0,0,0,0.6); }
/* 图片贴底：margin-top:auto 在内容短时把图片推到底部（间距≥30px），
   内容长时文字 padding-bottom:30px 保证最小 30px 间距，二者不重叠 */
.eco-card-img {
  position: relative; z-index: 1; margin-top: auto;
  width: 100%; height: 280px; flex-shrink: 0;
}
.eco-card-img img { width: 100%; height: 100%; object-fit: cover; display: block; }

/* ================================================================
   6. 四大硬核底层实力（y:4511~5461）
   ================================================================ */
.strength-section { background: var(--g-blue); padding: 100px 0; }
.strength-inner { max-width: 1380px; margin: 0 auto; padding: 0 20px; }
.strength-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.strength-card {
  background: #FFF; border-radius: 16px;
  padding: 36px 36px 24px; display: flex; flex-direction: column; gap: 20px;
}
.strength-card-title { font-size: 24px; font-weight: 500; line-height: 28px; color: #000; }
.strength-card-desc { font-size: 14px; font-weight: 400; line-height: 22px; color: rgba(0,0,0,0.6); }
.strength-tags { display: flex; gap: 16px; flex-wrap: wrap; margin-top: auto; }
.tag {
  display: inline-flex; align-items: center; padding: 6px 24px;
  background: #F5F9FE; border-radius: 18px;
  font-size: 14px; font-weight: 400; line-height: 22px; color: rgba(0,0,0,0.6);
}

/* ================================================================
   7. 合作伙伴（y:5483~6130）
   ================================================================ */
.partners-section { padding: 100px 0; background: #FDFDFD; }
.partners-inner { max-width: 1380px; margin: 0 auto; padding: 0 20px; }
.title-center { text-align: center; margin-bottom: 60px; }
.partners-grid {
  display: grid; grid-template-columns: repeat(5, 1fr);
  grid-auto-rows: 127px; gap: 0; justify-items: center; align-items: center;
}
.partner-item {
  display: flex; align-items: center; justify-content: center;
  width: 100%; height: 100%; padding: 24px;
}
.partner-item img { max-height: 50px; max-width: 155px; object-fit: contain; }

/* ================================================================
   8. Footer（y:6130~6650）
   ================================================================ */
.footer { background: var(--g-footer); padding: 89px 0 60px; }
.footer-inner { max-width: 1380px; margin: 0 auto; padding: 0 20px; }
.footer-cta { display: flex; justify-content: space-between; align-items: center; gap: 240px; }
.footer-cta-text { font-size: 48px; font-weight: 600; line-height: 64px; color: #000; }
.footer-top { display: flex; justify-content: space-between; align-items: flex-start; }
.footer-links { display: flex; gap: 80px; }
.footer-links-col { display: flex; flex-direction: column; gap: 42px; width: 100px; }
.footer-link { font-size: 14px; font-weight: 400; line-height: 14px; color: rgba(0,0,0,0.6); transition: color .2s; }
.footer-link:hover, .footer-link.active { color: #000; }
.footer-contact { display: flex; flex-direction: column; gap: 16px; }
.footer-contact-item { display: flex; flex-direction: row; align-items: center; gap: 45px; }
.footer-label { font-size: 14px; font-weight: 400; color: rgba(0,0,0,0.6); }
.footer-value { font-size: 14px; font-weight: 400; color: rgba(0,0,0,0.6); }
.footer-divider { margin: 56px 0; height: 1px; background: rgba(0,0,0,0.1); }
.footer-bottom { display: flex; justify-content: space-between; align-items: center; }
.footer-bottom-left { display: flex; flex-direction: row; gap: 28px; font-size: 14px; font-weight: 400; color: rgba(0,0,0,0.6); }
.footer-icp { font-size: 14px; font-weight: 400; color: rgba(0,0,0,0.6); transition: color .2s; }
.footer-icp:hover { color: var(--blue); }

/* ================================================================
   Responsive — 统一断点 1440 / 1200 / 1024 / 768 / 640
   ================================================================ */

/* ≤1440：大屏笔记本，视频放大并改为弹性宽度（占满文案右侧剩余空间，上限 800） */
@media (max-width: 1440px) {
  .hero { height: auto; }
  .hero-visual { width: auto; height: auto; flex: 1 1 auto; max-width: 800px; min-width: 0; aspect-ratio: 819/460; }
  .cards-mini-group { width: 500px; }
  /* 轮播整体随屏缩放，不被裁剪：viewport 取剩余空间（不能用 100%，否则连同两侧箭头溢出被裁） */
  /* 横版与竖版 viewport 共用同一比例，保证两种视频高度始终一致（横版视频 object-fit:cover 不变形） */
  .carousel-horizontal, .carousel-vertical { width: 100%; max-width: 1340px; gap: 12px; }
  .carousel-viewport   { flex: 1; min-width: 0; width: auto; height: auto; aspect-ratio: 1112/615; }
  .carousel-viewport-v { flex: 1; min-width: 0; width: auto; height: auto; aspect-ratio: 1112/615; }
  .carousel-track-h    { width: 100%; height: 100%; }
  .video-card-h        { flex: 0 0 100%; width: 100%; height: 100%; }
  /* 竖版：卡片宽度=viewport的1/3（减2个间距），恰好3张铺满不漏出；高度填满=横版同高 */
  .carousel-track-v    { gap: 24px; height: 100%; align-items: stretch; }
  .video-card-v        { flex: 0 0 calc((100% - 48px) / 3); width: calc((100% - 48px) / 3); height: 100%; }
}

/* ≤1200：收紧间距与字号，避免 hero / tabs 过早换行 */
@media (max-width: 1200px) {
  .hero-inner       { gap: 32px; }
  .hero-title       { font-size: 50px; line-height: 66px; }
  .hero-text        { max-width: 400px; }
  .hero-visual      { max-width: 680px; }
  .cards-mini-group { width: 440px; }
  .sol-tab          { width: 220px; }
  .value-tabs       { gap: 32px; }
  .footer-links     { gap: 60px; }
}

/* ≤1024：平板/竖屏，主区块改为单列堆叠 */
@media (max-width: 1024px) {
  .hero-inner        { flex-direction: column; padding: 80px 20px 60px; gap: 0; align-items: center; }
  /* 拍平 hero-text，让标题/副标题/按钮与视频成为同级，便于用 order 重排 */
  .hero-text         { display: contents; }
  .hero-title        { order: 1; font-size: 52px; line-height: 70px; text-align: center; }
  .hero-subtitle     { order: 2; margin-bottom: 32px; text-align: center; }
  /* 视频占满容器宽度（保留 hero-inner 左右 20px padding 与整体一致），保持圆角外框 */
  .hero-visual       { order: 3; width: 100%; height: auto; max-width: none; aspect-ratio: 819/460; align-self: stretch; }
  /* 按钮移到视频下方，上间距 40px */
  .hero-text .btn-primary { order: 4; margin-top: 40px; width: 300px; }
  .sol-tabs-wrap     { margin-bottom: 80px; }
  .sol-tabs          { flex-wrap: wrap; gap: 24px 16px; height: auto; }
  .sol-divider       { display: none; }
  .sol-tab           { width: calc(50% - 8px); }
  .cards-row         { flex-direction: column; height: auto; }
  /* 卡片改为自然高度流式排版，消除 margin-top:auto 造成的内容重叠 */
  .card-featured     { height: auto; min-height: 0; gap: 16px; }
  .card-featured-title { margin-top: 0; }
  .card-platform-img { width: 100%; height: 260px; margin-top: 0; }
  .card-platform-img img { object-fit: contain; }
  .cards-mini-group  { width: 100%; height: auto; grid-template-rows: none; }
  .mini-card         { height: auto; min-height: 200px; gap: 16px; }
  .mini-card-title   { margin-top: 0; }
  .strength-grid     { grid-template-columns: 1fr; }
  .eco-grid          { grid-template-columns: 1fr 1fr; }
  .partners-grid     { grid-template-columns: repeat(3, 1fr); }
  .footer-top        { flex-direction: column; gap: 40px; }
  .footer-cta        { flex-direction: column; gap: 20px; align-items: flex-start; }
  /* 轮播响应式 */
  .carousel-horizontal, .carousel-vertical { width: 100%; gap: 16px; }
  .carousel-viewport { width: 100%; max-width: 700px; height: auto; aspect-ratio: 1160/615; }
  .carousel-track-h  { width: 100%; height: 100%; }
  .video-card-h      { width: 100%; height: 100%; }
  /* 竖版 viewport 与横版同比例同高；卡片宽=1/3恰好3张铺满不漏出 */
  .carousel-viewport-v { width: 100%; max-width: 700px; height: auto; aspect-ratio: 1160/615; }
  .carousel-track-v  { gap: 16px; height: 100%; align-items: stretch; }
  .video-card-v      { flex: 0 0 calc((100% - 32px) / 3); width: calc((100% - 32px) / 3); height: 100%; border-radius: 12px; }
  .video-card-v .value-video { border-radius: 12px; }
  /* 英文文案较长：1024 以下 value-tabs 改 2x2，隐藏竖分隔线（属性选择器特异性盖过 640 的 4x1） */
  :root[data-lang="en"] .value-tabs   { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px 32px; max-width: 560px; margin-left: auto; margin-right: auto; }
  :root[data-lang="en"] .value-tab    { width: 100%; }
  :root[data-lang="en"] .value-divider { display: none; }
}

/* ≤960：横版视频框圆角收为 12 */
@media (max-width: 960px) {
  .carousel-viewport { border-radius: 12px; }
}

/* ≤768：小平板/大手机 */
@media (max-width: 768px) {
  .section-title   { font-size: 40px; line-height: 56px; }
  .hero-title      { font-size: 42px; line-height: 56px; }
  .nav-links       { padding: 0 16px; gap: 8px; }
  .value-tabs      { flex-wrap: wrap; gap: 24px; }
  .value-divider   { display: none; }
  .value-tab       { width: calc(50% - 12px); }
  .eco-grid        { grid-template-columns: 1fr; }
  .partners-grid   { grid-template-columns: repeat(2, 1fr); }
  .footer-links    { gap: 40px; flex-wrap: wrap; }
  .footer-cta-text { font-size: 36px; line-height: 48px; }
}

/* ≤640：手机 */
@media (max-width: 640px) {
  .header-inner     { padding: 0 20px; }
  /* 内联导航隐藏，改用汉堡菜单展开面板 */
  .nav-links        { display: none; }
  .logo-link        { padding: 14px 24px 14px 0; }
  /* 语言按钮收为纯图标 */
  .lang-btn span    { display: none; }
  .lang-wrap        { width: auto; }
  .lang-btn         { justify-content: center; }
  .lang-menu        { left: auto; right: 0; min-width: 120px; }
  /* 汉堡按钮显示 */
  .menu-toggle      { display: flex; }
  /* 展开式导航面板：从屏幕顶部铺开（top:0），用 padding-top 给 header 区域留位，
     整块（header 区 + 导航列表）共用同一层毛玻璃，避免 header 与面板两层 backdrop-filter 叠加导致模糊度/渲染不一致 */
  .mobile-nav {
    position: fixed; top: 0; left: 0; right: 0; z-index: 999;
    background: rgba(253,253,253,0.92); backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(0,0,0,0.1);
    padding: 64px 20px 30px; display: none;
  }
  .mobile-nav.open  { display: block; }
  /* header 始终透明：滚动/菜单展开的底色都交给 mobile-nav 这一层统一渲染，header 内容浮在其上 */
  .header.menu-open { background: transparent; box-shadow: none; backdrop-filter: none; }
  .mobile-nav-item {
    display: flex; align-items: center; height: 60px;
    border-bottom: 1px solid rgba(0,0,0,0.1);
    font-size: 14px; font-weight: 400; line-height: 14px;
    color: rgba(0,0,0,0.6); text-decoration: none; transition: color .2s;
  }
  .mobile-nav-item.active { color: #000; }
  .hero-inner       { padding: 64px 16px 32px; }
  .hero-title       { font-size: 40px; line-height: 46px; }
  .hero-subtitle    { font-size: 16px; }
  .section-title    { font-size: 36px; line-height: 48px; }
  .section-subtitle { font-size: 16px; }
  .footer-cta-text  { font-size: 32px; line-height: 40px; }
  .hero-text .btn-primary { width: 100%; }
  /* sol-tabs 改 2x2 网格，高度由内容撑开 */
  .sol-tabs         { display: grid; grid-template-columns: 1fr 1fr; gap: 24px 16px; align-items: start; height: auto; }
  .sol-tab          { width: 100%; }
  .card-featured, .mini-card { padding: 24px; }
  .card-platform-img { height: 200px; }
  .eco-card-text    { padding-left: 24px; padding-right: 24px; }
  .eco-icon         { left: 24px; }
  /* 单列全宽卡片：取消固定最小高与贴底，卡片高度随内容，图片紧跟文字保持 30px 间距 */
  .eco-card         { min-height: 0; }
  .eco-card-img     { margin-top: 0; }
  .partners-grid    { grid-template-columns: repeat(2, 1fr); }
  /* value-tabs 改 4x1 单行网格，隐藏描述，避免竖版视频下方被切 */
  .value-tabs       { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; }
  .value-tab        { width: 100%; padding: 12px 4px; gap: 8px; }
  .value-tab-title  { font-size: 20px; line-height: 22px; }
  .value-tab-desc   { display: none; }
  .footer-bottom    { flex-direction: column; gap: 16px; align-items: flex-start; }
  /* 轮播箭头移到视频下方：viewport 占满首行，两箭头换行居中，行距=视频间距24px、箭头间距30px */
  .carousel-horizontal, .carousel-vertical { flex-wrap: wrap; justify-content: center; align-items: center; row-gap: 24px; column-gap: 120px; }
  .carousel-viewport, .carousel-viewport-v { order: -1; flex: 0 0 100%; max-width: 100%; }
  .carousel-arrow   { order: 1; }
  /* 仅竖版控件 640 下居中；横版始终左下 24px（卡片占满 viewport，故等同与 viewport 左下 24px） */
  .video-card-v .video-controls-v { left: 50%; right: auto; transform: translateX(-50%); justify-content: center; }
  /* 控件按钮与图标保持固定尺寸，不随窄卡片缩放 */
  .video-btn-v   { flex-shrink: 0; padding: 12px; }
  .v-icon        { width: 17px; height: 17px; max-width: none; flex-shrink: 0; }
  .footer-bottom-left { flex-wrap: wrap; gap: 12px 20px; }
  .footer-contact-item { gap: 20px; }
}

/* ≤470：超小屏，合作伙伴格子随屏等比缩放（取消固定行高，用宽高比 + 缩放 logo） */
@media (max-width: 470px) {
  .partners-grid    { grid-auto-rows: auto; }
  .partner-item     { aspect-ratio: 155/100; padding: 12%; }
  .partner-item img { max-height: 100%; max-width: 100%; }
}

/* ================================================================
   联系我们弹窗（Contact Modal）— 还原 Figma 117:817 亮色 / 191:1115 暗色
   ================================================================ */
.contact-modal {
  position: fixed; inset: 0; z-index: 2000;
  display: flex; align-items: center; justify-content: center;
  padding: 20px;
  background: rgba(0,0,0,0.3);
  opacity: 0; visibility: hidden;
  transition: opacity .3s ease, visibility .3s ease;
}
.contact-modal.open { opacity: 1; visibility: visible; }
.contact-modal-box {
  width: 480px; max-width: 100%;
  background: #FFF; border-radius: 24px; padding: 32px;
  display: flex; flex-direction: column; gap: 32px;
  transform: translateY(16px) scale(0.98);
  transition: transform .3s cubic-bezier(0.22, 1, 0.36, 1);
  max-height: calc(100vh - 40px); overflow-y: auto;
}
.contact-modal.open .contact-modal-box { transform: none; }
.contact-modal-head {
  display: flex; align-items: flex-start; justify-content: space-between; gap: 16px;
}
.contact-modal-title {
  font-size: 36px; font-weight: 600; line-height: 48px; color: #000;
  white-space: pre-line;
}
.contact-modal-close {
  flex-shrink: 0; width: 42px; height: 42px; border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
  background: rgba(0,0,0,0.05); cursor: pointer; transition: background .2s;
}
.contact-modal-close:hover { background: rgba(0,0,0,0.1); }
.contact-modal-close img { width: 24px; height: 24px; }
.contact-modal-body {
  display: flex; flex-direction: column; align-items: center; gap: 36px;
  padding: 24px 0 32px;
}
.contact-qr-group { display: flex; flex-direction: column; align-items: center; gap: 12px; }
.contact-qr-card {
  width: 240px; height: 240px; border-radius: 16px; background: #FFF;
  display: flex; align-items: center; justify-content: center;
  border: 1px solid rgba(0,0,0,0.06);
}
.contact-qr-card img { width: 190px; height: 190px; object-fit: cover; border-radius: 8px; }
.contact-qr-tip { font-size: 14px; font-weight: 400; line-height: 14px; color: #000; }
.contact-online-btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 10px;
  width: 199px; height: 58px; background: var(--blue); color: #FFF;
  border-radius: 12px; font-size: 16px; font-weight: 400; line-height: 16px;
  transition: background .2s;
}
.contact-online-btn:hover { background: #1560E6; }
.contact-online-btn img { width: 16px; height: 16px; filter: brightness(0) invert(1); }

/* 暗色弹窗 */
:root[data-theme="dark"] .contact-modal { background: rgba(0,0,0,0.5); }
:root[data-theme="dark"] .contact-modal-box { background: #272727; }
:root[data-theme="dark"] .contact-modal-title { color: #fff; }
:root[data-theme="dark"] .contact-modal-close { background: #3C3C3C; }
:root[data-theme="dark"] .contact-modal-close:hover { background: #484848; }
:root[data-theme="dark"] .contact-modal-close img { filter: brightness(0) invert(1); }
:root[data-theme="dark"] .contact-qr-card { background: #FFF; border-color: transparent; }
:root[data-theme="dark"] .contact-qr-tip { color: #fff; }

@media (max-width: 640px) {
  .contact-modal-box { border-radius: 20px; padding: 24px; gap: 24px; }
  .contact-modal-title { font-size: 26px; line-height: 36px; }
  .contact-modal-body { padding: 16px 0 24px; gap: 28px; }
}

/* ================================================================
   滚动渐现动效（从下到上淡入）
   ================================================================ */
.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity .7s cubic-bezier(0.22, 1, 0.36, 1),
              transform .7s cubic-bezier(0.22, 1, 0.36, 1);
  will-change: opacity, transform;
}
.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}
/* 错落延迟（同组子元素依次淡入） */
.reveal[data-delay="1"] { transition-delay: .1s; }
.reveal[data-delay="2"] { transition-delay: .2s; }
.reveal[data-delay="3"] { transition-delay: .3s; }
.reveal[data-delay="4"] { transition-delay: .4s; }
.reveal[data-delay="5"] { transition-delay: .5s; }
.reveal[data-delay="6"] { transition-delay: .6s; }
.reveal[data-delay="7"] { transition-delay: .7s; }
.reveal[data-delay="8"] { transition-delay: .8s; }

@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
}

/* ================================================================
   暗色模式（Dark Mode）— 100% 还原 Figma dark 设计稿
   触发：<html data-theme="dark">
   色板：页面 #000 / 卡片 #2C2C2C / 标签 #262626 / 边框 rgba(255,255,255,.1~.2)
        文字 #fff、rgba(255,255,255,.6/.8) / 品牌蓝 #1C6FFF
   ================================================================ */
:root[data-theme="dark"] {
  --bg: #000;
  --g-hero: linear-gradient(180deg, #0F0F0F 0%, #000 100%);
  --g-blue: #000;
  --g-eco: #000;
  --g-footer: rgba(15,15,15,0.8);
}
:root[data-theme="dark"] body { background: #000; color: #fff; }

/* 主题切换：图标颜色随主题反色（亮色用黑、暗色用白） */
:root[data-theme="dark"] .icon-btn img { filter: brightness(0) invert(1); }

/* ---------- 通用文字 ---------- */
:root[data-theme="dark"] .section-title { color: #fff; }
:root[data-theme="dark"] .section-subtitle { color: rgba(255,255,255,0.8); }

/* ---------- Header ---------- */
:root[data-theme="dark"] .header.scrolled {
  background: rgba(10,10,10,0.92);
  box-shadow: 0 1px 20px rgba(0,0,0,0.5);
}
:root[data-theme="dark"] .nav-item { color: rgba(255,255,255,0.6); }
:root[data-theme="dark"] .nav-item:hover,
:root[data-theme="dark"] .nav-item.active { color: #fff; background: rgba(255,255,255,0.08); }
:root[data-theme="dark"] .icon-btn { border-color: rgba(255,255,255,0.1); }
:root[data-theme="dark"] .icon-btn:hover { background: rgba(255,255,255,0.08); }
/* 暗色移动展开导航：整块毛玻璃底（与暗色滚动 header 一致）、分隔线、激活项白色（Figma 198:1386） */
:root[data-theme="dark"] .mobile-nav { background: rgba(10,10,10,0.92); border-bottom-color: rgba(255,255,255,0.1); }
:root[data-theme="dark"] .header.menu-open { background: transparent; box-shadow: none; }
:root[data-theme="dark"] .mobile-nav-item { color: rgba(255,255,255,0.6); border-bottom-color: rgba(255,255,255,0.1); }
:root[data-theme="dark"] .mobile-nav-item.active { color: #fff; }
:root[data-theme="dark"] .lang-btn span { color: rgba(255,255,255,0.6); }
:root[data-theme="dark"] .logo-img { filter: brightness(0) invert(1); }
/* 语言下拉暗色（Figma 192:1300：底 #000、描边 rgba(255,255,255,.1)、当前项 #2D2D2D） */
:root[data-theme="dark"] .lang-menu { background: #000; border-color: rgba(255,255,255,0.1); box-shadow: 0 8px 24px rgba(0,0,0,0.5); }
:root[data-theme="dark"] .lang-option { color: rgba(255,255,255,0.6); }
:root[data-theme="dark"] .lang-option:hover { background: rgba(255,255,255,0.08); color: #fff; }
:root[data-theme="dark"] .lang-option.active { background: #2D2D2D; color: #fff; }

/* ---------- Hero ---------- */
:root[data-theme="dark"] .hero { background: var(--g-hero); }
:root[data-theme="dark"] .hero-title,
:root[data-theme="dark"] .t-bold { color: #fff; }
:root[data-theme="dark"] .hero-subtitle { color: rgba(255,255,255,0.8); }

/* ---------- 解决方案区 + 卡片 ---------- */
:root[data-theme="dark"] .solutions-section { background: #000; }
:root[data-theme="dark"] .sol-tab-title { color: #fff; }
:root[data-theme="dark"] .sol-tab-desc { color: rgba(255,255,255,0.6); }
:root[data-theme="dark"] .sol-tab .icon-18 { filter: brightness(0) invert(0.7); }
:root[data-theme="dark"] .sol-divider { border-color: rgba(255,255,255,0.1); }
/* 卡片底色：实心 #2C2C2C，悬停略亮 */
:root[data-theme="dark"] .card-featured::before,
:root[data-theme="dark"] .mini-card::before {
  background: #181818; opacity: 1;
}
:root[data-theme="dark"] .card-featured:hover::before,
:root[data-theme="dark"] .mini-card:hover::before { background: #2C2C2C; opacity: 1; }
:root[data-theme="dark"] .card-featured-title,
:root[data-theme="dark"] .mini-card-title { color: #fff; }
:root[data-theme="dark"] .card-featured-desc,
:root[data-theme="dark"] .mini-card-desc { color: rgba(255,255,255,0.6); }

/* ---------- 价值区 ---------- */
:root[data-theme="dark"] .value-section { background: #000; }
/* 未激活 tab：暗底下用半透明白替代 rgba(0,0,0,.2)，否则不可见 */
:root[data-theme="dark"] .value-tab-title,
:root[data-theme="dark"] .value-tab-desc { color: rgba(255,255,255,0.3); }
:root[data-theme="dark"] .value-tab.active .value-tab-title { color: #fff; }
:root[data-theme="dark"] .value-tab.active .value-tab-desc { color: rgba(255,255,255,0.6); }
:root[data-theme="dark"] .value-divider { border-color: rgba(255,255,255,0.1); }

/* ---------- 商业闭环 eco 区 ---------- */
:root[data-theme="dark"] .ecosystem-section { background: #000; }
:root[data-theme="dark"] .eco-card::before { background: #181818; opacity: 1; }
:root[data-theme="dark"] .eco-card:hover::before { background: #2C2C2C; opacity: 1; }
:root[data-theme="dark"] .eco-icon { background: #1A1A1A; }
:root[data-theme="dark"] .eco-icon .icon-24 { filter: brightness(0) invert(0.7); }
:root[data-theme="dark"] .eco-card-title { color: #fff; }
:root[data-theme="dark"] .eco-card-desc { color: rgba(255,255,255,0.6); }

/* ---------- 底层实力区 ---------- */
:root[data-theme="dark"] .strength-section { background: #000; }
:root[data-theme="dark"] .strength-card { background: #2C2C2C; }
:root[data-theme="dark"] .strength-card-title { color: #fff; }
:root[data-theme="dark"] .strength-card-desc { color: rgba(255,255,255,0.6); }
:root[data-theme="dark"] .tag { background: #262626; color: rgba(255,255,255,0.6); }

/* ---------- 合作伙伴区 ---------- */
:root[data-theme="dark"] .partners-section { background: #000; }
/* 暗色稿：每个 logo 落在白色圆角卡片内，logo 保持原色（不反白） */
:root[data-theme="dark"] .partners-grid { gap: 10px; }
:root[data-theme="dark"] .partner-item {
  background: #fff; border-radius: 24px; padding: 24px;
}
:root[data-theme="dark"] .partner-item img { filter: none; opacity: 1; }

/* ---------- Footer ---------- */
:root[data-theme="dark"] .footer { background: rgba(15,15,15,0.8); }
:root[data-theme="dark"] .footer-cta-text { color: #fff; }
:root[data-theme="dark"] .footer-link { color: rgba(255,255,255,0.6); }
:root[data-theme="dark"] .footer-link:hover,
:root[data-theme="dark"] .footer-link.active { color: #fff; }
:root[data-theme="dark"] .footer-label,
:root[data-theme="dark"] .footer-value { color: rgba(255,255,255,0.6); }
:root[data-theme="dark"] .footer-divider { background: rgba(255,255,255,0.1); }
:root[data-theme="dark"] .footer-bottom-left,
:root[data-theme="dark"] .footer-icp { color: rgba(255,255,255,0.6); }

/* ---------- 视频控件保持暗底，无需反色 ---------- */
:root[data-theme="dark"] .carousel-arrow { filter: brightness(0) invert(0.85); }
:root[data-theme="dark"] .carousel-arrow.disabled { filter: brightness(0) invert(0.4); }