/* ============================================================
   XJJ集团演示站 - 样式
   主色取自参考站：#182b57（深藏青）
   动效原则：只动画 transform / opacity，保证 60fps 丝滑
   ============================================================ */

:root {
  --navy: #182b57;
  --navy-deep: #0e1d3f;
  --accent: #2f6fe4;
  --ink: #22304a;
  --grey: #66707f;
  --line: #e6eaf1;
  --bg-soft: #f5f7fa;
  --white: #ffffff;
  --header-h: 72px;
  --radius: 14px;
  --shadow-sm: 0 2px 10px rgba(24, 43, 87, .06);
  --shadow-md: 0 12px 32px rgba(24, 43, 87, .10);
  --ease-out: cubic-bezier(.22, .61, .36, 1);
  --ease-smooth: cubic-bezier(.45, 0, .15, 1);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

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

body {
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  color: var(--ink);
  background: var(--white);
  line-height: 1.75;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img { display: block; max-width: 100%; }
ul, ol { list-style: none; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }

::selection { background: rgba(47, 111, 228, .18); }

::-webkit-scrollbar { width: 10px; }
::-webkit-scrollbar-track { background: #eef1f6; }
::-webkit-scrollbar-thumb { background: #c2cad8; border-radius: 5px; }
::-webkit-scrollbar-thumb:hover { background: var(--navy); }

.container { width: min(1180px, calc(100% - 48px)); margin: 0 auto; }

/* ------------------------------------------------------------
   表头：常驻固定置顶
   首屏时透明悬浮，滚动后白底毛玻璃，始终可见
   ------------------------------------------------------------ */
.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  transition: background-color .45s var(--ease-smooth), box-shadow .45s var(--ease-smooth);
  background: transparent;
}
.site-header.scrolled {
  background: rgba(255, 255, 255, .92);
  -webkit-backdrop-filter: saturate(1.4) blur(14px);
  backdrop-filter: saturate(1.4) blur(14px);
  box-shadow: var(--shadow-sm);
}

.header-inner {
  width: min(1280px, calc(100% - 48px));
  margin: 0 auto;
  height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.logo { flex: 0 0 auto; display: flex; align-items: center; }
.logo img { height: 30px; width: auto; transition: opacity .35s var(--ease-smooth); }
.logo .logo-light { display: none; }
.site-header:not(.scrolled) .logo .logo-dark { display: none; }
.site-header:not(.scrolled) .logo .logo-light { display: block; }

.main-nav { display: flex; align-items: center; gap: 8px; }

.nav-link {
  position: relative;
  display: inline-flex;
  align-items: center;
  padding: 10px 16px;
  font-size: 15px;
  letter-spacing: .04em;
  color: var(--navy);
  border-radius: 8px;
  transition: color .3s var(--ease-smooth), background-color .3s var(--ease-smooth);
}
.nav-link::after {
  content: "";
  position: absolute;
  left: 16px; right: 16px; bottom: 4px;
  height: 2px;
  background: var(--accent);
  border-radius: 1px;
  transform: scaleX(0);
  transform-origin: center;
  transition: transform .4s var(--ease-smooth);
}
.nav-link:hover::after,
.nav-link.active::after { transform: scaleX(1); }

/* 首屏透明白字形态 */
.site-header:not(.scrolled) .nav-link { color: rgba(255, 255, 255, .92); }
.site-header:not(.scrolled) .lang-btn { color: rgba(255, 255, 255, .92); }

/* 字体切换（全站唯一二级菜单） */
.lang-switch { position: relative; }
.lang-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 14px;
  font-size: 15px;
  color: var(--navy);
  border-radius: 8px;
  transition: color .3s var(--ease-smooth), background-color .3s var(--ease-smooth);
}
.lang-btn:hover { background: rgba(47, 111, 228, .08); }
.site-header:not(.scrolled) .lang-btn:hover { background: rgba(255, 255, 255, .12); }
.lang-btn .chev {
  width: 7px; height: 7px;
  border-right: 1.6px solid currentColor;
  border-bottom: 1.6px solid currentColor;
  transform: rotate(45deg) translateY(-2px);
  transition: transform .35s var(--ease-smooth);
}
.lang-switch.open .lang-btn .chev { transform: rotate(225deg) translateY(-1px); }

.lang-menu {
  position: absolute;
  top: calc(100% + 10px);
  right: 0;
  min-width: 168px;
  background: var(--white);
  border-radius: 12px;
  box-shadow: var(--shadow-md);
  padding: 6px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: opacity .35s var(--ease-smooth), transform .35s var(--ease-smooth), visibility 0s linear .35s;
}
.lang-switch.open .lang-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
  transition: opacity .35s var(--ease-smooth), transform .35s var(--ease-smooth), visibility 0s;
}
.lang-option {
  display: flex;
  width: 100%;
  align-items: center;
  justify-content: space-between;
  padding: 10px 14px;
  font-size: 14px;
  color: var(--ink);
  border-radius: 8px;
  transition: background-color .25s var(--ease-smooth), color .25s var(--ease-smooth);
}
.lang-option:hover { background: var(--bg-soft); }
.lang-option.active { color: var(--accent); font-weight: 600; }
.lang-option.active::after { content: "✓"; font-size: 12px; }

/* 顶部滚动进度条 */
.scroll-progress {
  position: absolute;
  left: 0; right: 0; bottom: -2px;
  height: 2px;
  background: linear-gradient(90deg, var(--accent), #6ea0ff);
  transform: scaleX(0);
  transform-origin: left;
  opacity: 0;
  transition: opacity .3s var(--ease-smooth);
}
.scroll-progress.visible { opacity: 1; }

/* 移动端菜单按钮 */
.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 10px;
}
.menu-toggle span {
  width: 22px; height: 2px;
  background: var(--navy);
  border-radius: 1px;
  transition: transform .4s var(--ease-smooth), opacity .3s, background-color .3s;
}
.site-header:not(.scrolled) .menu-toggle span { background: #fff; }
.menu-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.menu-toggle.open span:nth-child(2) { opacity: 0; }
.menu-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ------------------------------------------------------------
   首屏
   ------------------------------------------------------------ */
.hero {
  position: relative;
  min-height: 100svh;
  display: flex;
  align-items: flex-end;
  overflow: hidden;
  color: #fff;
}
.hero-bg {
  position: absolute;
  inset: 0;
  width: 100%; height: 100%;
  object-fit: cover;
  animation: kenburns 22s var(--ease-smooth) both;
}
@keyframes kenburns {
  from { transform: scale(1.12) translateY(-1.5%); }
  to { transform: scale(1) translateY(0); }
}
.hero-overlay {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(12deg, rgba(11, 22, 48, .78) 0%, rgba(14, 29, 63, .42) 46%, rgba(14, 29, 63, .12) 78%),
    linear-gradient(180deg, rgba(11, 22, 48, .38) 0%, transparent 30%);
}
.hero-content {
  position: relative;
  width: min(1180px, calc(100% - 48px));
  margin: 0 auto;
  padding: 0 0 128px;
}
.hero-eyebrow {
  font-size: 13px;
  letter-spacing: .5em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, .72);
  margin-bottom: 18px;
}
.hero h1 {
  font-size: clamp(34px, 5.4vw, 62px);
  font-weight: 700;
  letter-spacing: .06em;
  line-height: 1.22;
  text-shadow: 0 4px 30px rgba(0, 0, 0, .25);
}
.hero-sub {
  max-width: 640px;
  margin-top: 22px;
  font-size: 16px;
  color: rgba(255, 255, 255, .85);
  text-shadow: 0 2px 12px rgba(0, 0, 0, .2);
}
.hero-scrollhint {
  position: absolute;
  left: 50%;
  bottom: 34px;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  color: rgba(255, 255, 255, .8);
  font-size: 12px;
  letter-spacing: .28em;
}
.mouse {
  width: 24px; height: 38px;
  border: 1.5px solid rgba(255, 255, 255, .75);
  border-radius: 14px;
  display: flex;
  justify-content: center;
  padding-top: 7px;
}
.mouse .dot {
  width: 3px; height: 8px;
  border-radius: 2px;
  background: #fff;
  animation: dotdrop 1.8s var(--ease-smooth) infinite;
}
@keyframes dotdrop {
  0% { transform: translateY(0); opacity: 1; }
  70% { transform: translateY(12px); opacity: 0; }
  100% { transform: translateY(0); opacity: 0; }
}

/* 首页引导带（品牌中心） */
.home-teaser { padding: 88px 0; background: var(--white); }
.home-teaser-inner {
  display: grid;
  grid-template-columns: .92fr 1.08fr;
  gap: 56px;
  align-items: center;
}
.ht-media {
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  aspect-ratio: 3 / 2;
}
.ht-media img { width: 100%; height: 100%; object-fit: cover; transition: transform 1.2s var(--ease-smooth); }
.ht-media:hover img { transform: scale(1.045); }
.ht-body h2 {
  font-size: clamp(26px, 3vw, 36px);
  color: var(--navy);
  letter-spacing: .08em;
  margin: 6px 0 16px;
}
.ht-body p { color: var(--grey); font-size: 15.5px; max-width: 520px; }

/* ------------------------------------------------------------
   通用区块
   ------------------------------------------------------------ */
.section { padding: 88px 0 88px; scroll-margin-top: var(--header-h); }
.section-alt { background: var(--bg-soft); }

/* ------------------------------------------------------------
   视图切换：每个菜单项对应一个独立视图（滑到底 = 该视图内容 + 底部栏）
   ------------------------------------------------------------ */
.view { display: none; padding-top: var(--header-h); }
.view.active {
  display: block;
  animation: viewIn .5s var(--ease-out) both;
}
#home { padding-top: 0; }
#about, #products { padding-top: calc(var(--header-h) + 40px); }
@keyframes viewIn {
  from { opacity: 0; transform: translateY(14px); }
  to { opacity: 1; transform: none; }
}

.section-head { text-align: center; margin-bottom: 72px; }
.eyebrow {
  font-size: 13px;
  letter-spacing: .42em;
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 600;
  margin-bottom: 14px;
}
.eyebrow.light { color: #9dbcf5; }
.section-head h2, .banner-content h2 {
  font-size: clamp(28px, 3.4vw, 40px);
  color: var(--navy);
  letter-spacing: .08em;
}
.banner-content h2 { color: #fff; }
.section-head .tagline {
  margin-top: 16px;
  color: var(--grey);
  font-size: 15.5px;
  max-width: 720px;
  margin-left: auto; margin-right: auto;
}
.tagline.light { color: rgba(255, 255, 255, .85); }

/* 块标题（英文小字 + 中文标题） */
.block-title { margin-bottom: 34px; }
.block-title em {
  display: block;
  font-style: normal;
  font-size: 12.5px;
  letter-spacing: .34em;
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 600;
  margin-bottom: 8px;
}
.block-title span {
  font-size: clamp(22px, 2.4vw, 28px);
  color: var(--navy);
  font-weight: 700;
  letter-spacing: .06em;
}

/* 左右分栏 */
.split {
  display: grid;
  grid-template-columns: 1.05fr .95fr;
  gap: 56px;
  align-items: center;
  margin-bottom: 88px;
}
.split-text p { color: var(--grey); font-size: 15.5px; text-align: justify; }
.split-media { display: grid; gap: 18px; }

.ph {
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  background: var(--bg-soft);
}
.ph img { width: 100%; height: 100%; object-fit: cover; transition: transform 1.1s var(--ease-smooth); }
.ph:hover img { transform: scale(1.045); }
.ph-16x9 { aspect-ratio: 16 / 9; }

/* 统计数字 */
.stats {
  margin-top: 34px;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
}
.stat {
  background: var(--bg-soft);
  border-radius: 12px;
  padding: 18px 20px;
  transition: transform .5s var(--ease-smooth), box-shadow .5s var(--ease-smooth);
}
.stat:hover { transform: translateY(-3px); box-shadow: var(--shadow-sm); }
.stat strong { display: block; font-size: 22px; color: var(--navy); letter-spacing: .02em; }
.stat span { font-size: 12.5px; color: var(--grey); line-height: 1.55; display: block; margin-top: 4px; }

/* 企业文化 */
.culture {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: start;
  margin-bottom: 88px;
}
.culture-cards { display: grid; gap: 14px; }
.value-card {
  background: var(--white);
  border: 1px solid var(--line);
  border-left: 3px solid var(--accent);
  border-radius: 12px;
  padding: 20px 24px;
  transition: transform .5s var(--ease-smooth), box-shadow .5s var(--ease-smooth);
}
.value-card:hover { transform: translateX(4px); box-shadow: var(--shadow-sm); }
.value-en { font-size: 11px; letter-spacing: .3em; color: #a4b0c4; font-weight: 600; }
.value-card h4 { color: var(--navy); font-size: 17px; margin: 4px 0 6px; }
.value-card p { font-size: 14px; color: var(--grey); }
.culture-media { display: grid; gap: 18px; }
.culture-media .ph:first-child { aspect-ratio: 4 / 3; }
.culture-media .ph:last-child { aspect-ratio: 16 / 9; }

/* 发展历程时间线 */
.milestones { margin-bottom: 88px; }
.timeline {
  position: relative;
  padding-left: 34px;
  display: grid;
  gap: 26px;
}
.timeline::before {
  content: "";
  position: absolute;
  left: 6px; top: 6px; bottom: 6px;
  width: 2px;
  background: linear-gradient(180deg, var(--accent), #c9d8f5);
  border-radius: 1px;
}
.timeline li { position: relative; }
.timeline li::before {
  content: "";
  position: absolute;
  left: -34px; top: 10px;
  width: 14px; height: 14px;
  border-radius: 50%;
  background: var(--white);
  border: 3px solid var(--accent);
  box-shadow: 0 0 0 4px rgba(47, 111, 228, .12);
}
.timeline .year {
  display: inline-block;
  font-size: 20px;
  font-weight: 700;
  color: var(--navy);
  letter-spacing: .04em;
  margin-bottom: 2px;
}
.timeline p { color: var(--grey); font-size: 14.5px; max-width: 860px; }

/* 荣誉资质 */
.honors { margin-bottom: 88px; }
.honor-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(215px, 1fr));
  gap: 18px;
}
.honor {
  background: var(--white);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: transform .5s var(--ease-smooth), box-shadow .5s var(--ease-smooth);
}
.honor:hover { transform: translateY(-5px); box-shadow: var(--shadow-md); }
.honor img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  transition: transform 1s var(--ease-smooth);
}
.honor:hover img { transform: scale(1.05); }
.honor figcaption {
  padding: 10px 12px;
  font-size: 12.5px;
  color: var(--grey);
  text-align: center;
  border-top: 1px solid var(--line);
}

/* 合作伙伴跑马灯 */
.partners { margin-bottom: 0; }
.marquee {
  overflow: hidden;
  -webkit-mask-image: linear-gradient(90deg, transparent, #000 12%, #000 88%, transparent);
  mask-image: linear-gradient(90deg, transparent, #000 12%, #000 88%, transparent);
}
.marquee-track {
  display: flex;
  align-items: center;
  gap: 72px;
  width: max-content;
  padding: 18px 36px;
  animation: marquee 30s linear infinite;
}
.marquee:hover .marquee-track { animation-play-state: paused; }
.marquee-track img {
  height: 44px;
  width: auto;
  object-fit: contain;
  filter: grayscale(.15);
  opacity: .85;
  transition: opacity .4s var(--ease-smooth), filter .4s var(--ease-smooth), transform .4s var(--ease-smooth);
}
.marquee-track img:hover { opacity: 1; filter: none; transform: translateY(-2px); }
@keyframes marquee {
  from { transform: translateX(0); }
  to { transform: translateX(-50%); }
}

/* 联系我们 */
.contact-panel {
  background: linear-gradient(135deg, var(--navy) 0%, var(--navy-deep) 100%);
  border-radius: 18px;
  padding: 44px 48px;
  color: #fff;
  box-shadow: var(--shadow-md);
}
.contact-company { font-size: 20px; font-weight: 700; letter-spacing: .06em; margin-bottom: 22px; }
.contact-list { display: grid; gap: 14px; }
.contact-list li { display: flex; gap: 14px; align-items: flex-start; font-size: 14.5px; color: rgba(255, 255, 255, .88); }
.contact-list svg { flex: 0 0 auto; width: 19px; height: 19px; margin-top: 4px; color: #8fb4f8; }

/* ------------------------------------------------------------
   业务发展
   ------------------------------------------------------------ */
.section-banner {
  position: relative;
  min-height: 42vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  padding: 28px 0 48px;
}
.banner-bg {
  position: absolute; inset: 0;
  width: 100%; height: 100%;
  object-fit: cover;
  animation: bannerIn 1.6s var(--ease-smooth) both;
}
@keyframes bannerIn {
  from { transform: scale(1.08); }
  to { transform: scale(1); }
}
.banner-overlay {
  position: absolute; inset: 0;
  background: linear-gradient(90deg, rgba(11, 22, 48, .74) 0%, rgba(11, 22, 48, .38) 55%, rgba(11, 22, 48, .18) 100%);
}
.banner-content { position: relative; }
.banner-content .tagline { margin-top: 14px; max-width: 640px; }

.biz-model { margin-top: 88px; }
.model-keyword {
  color: var(--accent);
  font-size: 19px;
  letter-spacing: .1em;
  margin-bottom: 12px;
}
.diagram {
  background: var(--white);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  padding: 34px;
  margin-bottom: 88px;
}
.diagram img { display: block; width: 100%; max-width: 1020px; margin: 0 auto; height: auto; }

.advantages { margin-bottom: 88px; }
.adv-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 22px;
}
.adv-card {
  background: var(--white);
  border-radius: var(--radius);
  padding: 34px 36px;
  box-shadow: var(--shadow-sm);
  transition: transform .55s var(--ease-smooth), box-shadow .55s var(--ease-smooth);
}
.adv-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-md); }
.adv-num {
  display: inline-block;
  font-size: 30px;
  font-weight: 700;
  color: var(--accent);
  opacity: .85;
  line-height: 1;
  margin-bottom: 14px;
}
.adv-card h4 { color: var(--navy); font-size: 17.5px; margin-bottom: 10px; letter-spacing: .02em; }
.adv-card p { font-size: 14px; color: var(--grey); text-align: justify; }

.strategy { margin-bottom: 88px; }
.strategy > p { color: var(--grey); font-size: 15px; text-align: justify; }
.quote {
  margin-top: 30px;
  padding: 26px 30px;
  border-left: 3px solid var(--accent);
  background: var(--white);
  border-radius: 0 var(--radius) var(--radius) 0;
  box-shadow: var(--shadow-sm);
}
.quote p { font-size: 17px; color: var(--navy); font-weight: 600; letter-spacing: .02em; }
.quote cite {
  display: block;
  margin-top: 10px;
  font-style: normal;
  font-size: 13.5px;
  color: var(--grey);
  text-align: right;
}

.footprint-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; align-items: center; }
.footprint-grid .ph { background: #fff; padding: 10px; }
.footprint-grid .ph:first-child img { aspect-ratio: 1000 / 480; height: auto; }
.footprint-grid .ph:last-child img { aspect-ratio: 1920 / 1154; height: auto; }

/* ------------------------------------------------------------
   品牌展示
   ------------------------------------------------------------ */
.brands-intro { margin-top: 88px; }
.brand-wall {
  background: var(--white);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  padding: 30px;
  margin-bottom: 88px;
}
.brand-wall img { width: 100%; height: auto; aspect-ratio: 2400 / 703; }

.brand-features { display: grid; gap: 26px; margin-bottom: 56px; }
.brand-feature {
  display: grid;
  grid-template-columns: 1.08fr .92fr;
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--white);
  box-shadow: var(--shadow-sm);
  transition: box-shadow .55s var(--ease-smooth);
}
.brand-feature:hover { box-shadow: var(--shadow-md); }
.brand-feature:nth-child(even) .bf-media { order: 2; }
.bf-media { overflow: hidden; min-height: 320px; }
.bf-media img { width: 100%; height: 100%; object-fit: cover; transition: transform 1.1s var(--ease-smooth); }
.brand-feature:hover .bf-media img { transform: scale(1.045); }
.bf-body { padding: 40px 44px; display: flex; flex-direction: column; justify-content: center; }
.brand-logo-chip {
  align-self: flex-start;
  background: var(--bg-soft);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 16px 22px;
  margin-bottom: 18px;
  display: flex;
  justify-content: center;
}
.brand-logo-chip img { height: 64px; width: auto; max-width: 280px; object-fit: contain; border-radius: 10px; }
.bf-body h4 { color: var(--navy); font-size: 20px; letter-spacing: .05em; margin-bottom: 10px; }
.bf-body p { color: var(--grey); font-size: 14.5px; }

.brand-more {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.brand-mini {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 26px 28px;
  transition: transform .5s var(--ease-smooth), box-shadow .5s var(--ease-smooth), border-color .5s;
}
.brand-mini:hover { transform: translateY(-4px); box-shadow: var(--shadow-sm); border-color: rgba(47, 111, 228, .35); }
.brand-mini h4 { color: var(--navy); font-size: 16.5px; letter-spacing: .06em; margin-bottom: 8px; }
.brand-mini p { font-size: 13.5px; color: var(--grey); }

/* ------------------------------------------------------------
   产品展示
   ------------------------------------------------------------ */
.product-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.product-card {
  background: var(--white);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: transform .55s var(--ease-smooth), box-shadow .55s var(--ease-smooth);
}
.product-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-md); }
.pc-media { overflow: hidden; aspect-ratio: 4 / 3; background: var(--bg-soft); }
.pc-media img {
  width: 100%; height: 100%;
  object-fit: cover;
  transition: transform 1.1s var(--ease-smooth);
}
.product-card:hover .pc-media img { transform: scale(1.06); }
.product-card figcaption {
  padding: 16px 20px 18px;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  border-top: 1px solid var(--line);
}
.product-card strong { color: var(--navy); font-size: 15px; letter-spacing: .05em; }
.product-card figcaption span { flex: 1; font-size: 12px; line-height: 1.55; color: var(--grey); }

/* ------------------------------------------------------------
   页脚
   ------------------------------------------------------------ */
.site-footer {
  background: var(--navy-deep);
  color: rgba(255, 255, 255, .82);
  padding: 54px 0 40px;
}
.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 40px;
  flex-wrap: wrap;
}
.footer-logo { height: 30px; width: auto; margin-bottom: 16px; }
.footer-brand p { font-size: 13.5px; max-width: 420px; color: rgba(255, 255, 255, .66); }
.footer-meta { text-align: right; font-size: 12.5px; color: rgba(255, 255, 255, .55); }
.footer-meta p + p { margin-top: 8px; }
.footer-note { opacity: .8; }

/* ------------------------------------------------------------
   入场动画（IntersectionObserver 添加 .in）
   仅 transform + opacity，保证合成层动画
   ------------------------------------------------------------ */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity .85s var(--ease-out) var(--d, 0s), transform .85s var(--ease-out) var(--d, 0s);
  will-change: opacity, transform;
}
.reveal.in { opacity: 1; transform: none; }

/* ------------------------------------------------------------
   响应式
   ------------------------------------------------------------ */
@media (max-width: 1024px) {
  .split, .culture, .footprint-grid, .home-teaser-inner { grid-template-columns: 1fr; gap: 36px; }
  .adv-grid { grid-template-columns: 1fr; }
  .brand-more { grid-template-columns: repeat(2, 1fr); }
  .brand-feature { grid-template-columns: 1fr; }
  .brand-feature:nth-child(even) .bf-media { order: 0; }
  .bf-media { min-height: 260px; }
  .product-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  :root { --header-h: 60px; }
  .menu-toggle { display: flex; }

  .main-nav {
    position: fixed;
    inset: var(--header-h) 0 0 0;
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
    padding: 28px 30px;
    background: rgba(255, 255, 255, .98);
    -webkit-backdrop-filter: blur(18px);
    backdrop-filter: blur(18px);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-12px);
    transition: opacity .4s var(--ease-smooth), transform .4s var(--ease-smooth), visibility 0s linear .4s;
  }
  .site-header.nav-open .main-nav {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
    transition: opacity .4s var(--ease-smooth), transform .4s var(--ease-smooth), visibility 0s;
  }
  .site-header.nav-open { background: #fff; }
  .nav-link { font-size: 18px; padding: 16px 6px; border-bottom: 1px solid var(--line); border-radius: 0; }
  .nav-link::after { display: none; }
  .site-header:not(.scrolled) .nav-link,
  .site-header:not(.scrolled) .lang-btn { color: var(--navy); }
  .site-header:not(.scrolled) .menu-toggle span { background: var(--navy); }

  .lang-switch { margin-top: 18px; }
  .lang-btn { width: 100%; justify-content: space-between; padding: 14px 6px; font-size: 16px; }
  .lang-menu {
    position: static;
    opacity: 1; visibility: visible; transform: none;
    box-shadow: none;
    display: none;
    padding: 0 0 0 8px;
  }
  .lang-switch.open .lang-menu { display: block; }

  .section { padding: 72px 0 64px; }
  .section-head { margin-bottom: 48px; }
  .hero-content { padding-bottom: 108px; }
  .contact-panel { padding: 32px 26px; }
  .footer-inner { flex-direction: column; }
  .footer-meta { text-align: left; }
  .banner-content .tagline { font-size: 14px; }
}

@media (max-width: 560px) {
  .container { width: calc(100% - 36px); }
  .product-grid, .brand-more { grid-template-columns: 1fr; }
  .stats { grid-template-columns: 1fr 1fr; }
  .honor-grid { grid-template-columns: repeat(2, 1fr); gap: 12px; }
  .marquee-track { gap: 44px; }
  .marquee-track img { height: 34px; }
  .bf-body { padding: 26px 24px; }
  .diagram { padding: 18px; }
}

/* ------------------------------------------------------------
   减弱动态效果偏好
   ------------------------------------------------------------ */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
  }
  .reveal { opacity: 1; transform: none; }
  .marquee-track { animation: none; flex-wrap: wrap; width: auto; justify-content: center; }
}