/* ==========================================================================
   新疆卓仟科技有限公司 - 官方网站样式表
   视觉调性：清爽明亮浅色主题（严格无暗色区块） + 汲取企业Logo蓝青绿灵动三原色
   ========================================================================== */

:root {
  /* 提取自新疆卓仟科技有限公司流带Logo的品牌色系 */
  --zq-blue: #0077d8;
  --zq-blue-deep: #143f8c;
  --zq-cyan: #00aeef;
  --zq-green: #7bc142;
  --zq-lime: #b5c92b;
  --zq-gradient: linear-gradient(135deg, #143f8c 0%, #0088e8 52%, #00b8e6 100%);
  --zq-accent-gradient: linear-gradient(135deg, #0077d8 0%, #00b4e5 60%, #7bc142 100%);

  /* 全站严格浅色明亮背景体系 */
  --bg-white: #ffffff;
  --bg-soft: #f5f9fd;
  --bg-ice: #eef6fc;
  --bg-mint: #f4faf6;
  --surface-glass: rgba(255, 255, 255, 0.88);

  /* 清晰高可读文字色（非背景暗色） */
  --text-heading: #162b48;
  --text-body: #425874;
  --text-muted: #6e849e;

  --border-light: #e1ecf6;
  --border-hover: #bed8f0;

  --shadow-xs: 0 2px 8px rgba(20, 63, 140, 0.05);
  --shadow-sm: 0 8px 24px rgba(20, 63, 140, 0.06);
  --shadow-md: 0 16px 38px rgba(0, 119, 216, 0.10);
  --shadow-pill: 0 6px 18px rgba(0, 119, 216, 0.22);

  --radius-sm: 12px;
  --radius-md: 18px;
  --radius-lg: 26px;
  --radius-pill: 9999px;

  --container-w: 1320px;
  --header-h: 76px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-h);
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background-color: var(--bg-white);
  color: var(--text-body);
  line-height: 1.68;
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
  transition: all 0.28s var(--ease);
}

img {
  max-width: 100%;
  display: block;
}

ul {
  list-style: none;
}

button {
  font-family: inherit;
  border: none;
  background: none;
  cursor: pointer;
}

.container {
  width: 100%;
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 0 24px;
}

/* ==========================================================================
   顶部导航栏（未滑动透明无背景+纯白Logo/公司名/标签，向下滑动切换白底+简洁底部横线高亮）
   ========================================================================== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--header-h);
  background: transparent;
  border-bottom: 1px solid transparent;
  transition: background 0.3s var(--ease), box-shadow 0.3s var(--ease), border-color 0.3s var(--ease);
}

.site-header.is-scrolled {
  background: #ffffff;
  border-bottom-color: var(--border-light);
  box-shadow: 0 6px 24px rgba(20, 63, 140, 0.06);
}

.nav-inner {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand-logo {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

.logo-img {
  width: 42px;
  height: 42px;
  object-fit: contain;
  /* 未滑动时Logo呈纯白色，向下滑动后恢复原彩Logo */
  filter: brightness(0) invert(1);
  transition: transform 0.35s var(--ease), filter 0.3s var(--ease);
}

.site-header.is-scrolled .logo-img {
  filter: none;
}

.brand-logo:hover .logo-img {
  transform: rotate(8deg) scale(1.04);
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.brand-cn {
  font-size: 18px;
  font-weight: 700;
  color: #ffffff;
  letter-spacing: 0.4px;
  transition: color 0.3s var(--ease);
}

.brand-en {
  font-size: 10px;
  font-weight: 600;
  color: rgba(255, 255, 255, 0.92);
  letter-spacing: 1.4px;
  margin-top: 3px;
  transition: color 0.3s var(--ease);
}

.site-header.is-scrolled .brand-cn {
  color: var(--text-heading);
}

.site-header.is-scrolled .brand-en {
  color: var(--zq-blue);
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-link {
  position: relative;
  padding: 8px 2px;
  font-size: 15px;
  font-weight: 600;
  color: #ffffff;
  white-space: nowrap;
  transition: color 0.25s var(--ease);
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  border-radius: 2px;
  background: #ffffff;
  transform: scaleX(0);
  transform-origin: center;
  transition: transform 0.28s var(--ease), background 0.28s var(--ease);
}

.nav-link:hover::after,
.nav-link.active::after {
  transform: scaleX(1);
}

.site-header.is-scrolled .nav-link {
  color: var(--text-body);
  text-shadow: none;
}

.site-header.is-scrolled .nav-link:hover,
.site-header.is-scrolled .nav-link.active {
  color: var(--zq-blue);
}

.site-header.is-scrolled .nav-link::after {
  background: var(--zq-blue);
}

.mobile-menu-btn {
  display: none;
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.18);
  border: 1px solid rgba(255, 255, 255, 0.45);
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 5px;
  transition: background 0.3s var(--ease), border-color 0.3s var(--ease);
}

.mobile-menu-btn span {
  width: 20px;
  height: 2px;
  background: #ffffff;
  border-radius: 2px;
  transition: all 0.28s var(--ease);
}

.site-header.is-scrolled .mobile-menu-btn {
  background: var(--bg-soft);
  border-color: var(--border-light);
}

.site-header.is-scrolled .mobile-menu-btn span {
  background: var(--text-heading);
}

/* ==========================================================================
   1. 首屏轮播区（高度+100px + 顶部横向毛玻璃高斯模糊 + 整行自下而上动效）
   ========================================================================== */
.hero-section {
  position: relative;
  width: 100%;
  height: calc(100vh + 50px);
  min-height: 690px;
  max-height: 930px;
  background: var(--bg-ice);
  overflow: hidden;
}

.hero-slides {
  position: relative;
  width: 100%;
  height: 100%;
}

.hero-slide {
  position: absolute;
  inset: 0;
  transform: translateX(-100%);
  visibility: hidden;
  z-index: 1;
}

.hero-slide.active {
  transform: translateX(0);
  visibility: visible;
  z-index: 3;
}

.hero-slide.is-entering {
  visibility: visible;
  z-index: 3;
  transition: transform 0.72s var(--ease);
}

.hero-slide.is-leaving {
  transform: translateX(100%);
  visibility: visible;
  z-index: 2;
  transition: transform 0.72s var(--ease);
}

.hero-bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
}

/* 全图纯净无色毛玻璃模糊，仅右侧约 1/2 区域呈圆弧径向羽化清晰透出 */
.hero-frost {
  position: absolute;
  inset: 0;
  z-index: 2;
  pointer-events: none;
  background: transparent;
  backdrop-filter: blur(7px) saturate(1.04);
  -webkit-backdrop-filter: blur(7px) saturate(1.04);
  -webkit-mask-image: radial-gradient(
    ellipse 50% 64% at 86% 64%,
    transparent 0%,
    transparent 54%,
    rgba(0, 0, 0, 0.25) 68%,
    rgba(0, 0, 0, 0.65) 84%,
    #000000 100%
  );
  mask-image: radial-gradient(
    ellipse 50% 64% at 86% 64%,
    transparent 0%,
    transparent 54%,
    rgba(0, 0, 0, 0.25) 68%,
    rgba(0, 0, 0, 0.65) 84%,
    #000000 100%
  );
}

.hero-content-wrap {
  position: relative;
  z-index: 3;
  height: 100%;
  padding-top: var(--header-h);
  display: flex;
  align-items: center;
}

.hero-copy {
  max-width: 780px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 34px;
  transform: translateY(-20px);
}

.hero-title {
  font-size: clamp(46px, 5.4vw, 66px);
  font-weight: 800;
  line-height: 1.24;
  letter-spacing: 1px;
  color: #ffffff;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

/* 每一行独立遮罩裁切，从下往上整行浮现 */
.title-line {
  display: block;
  overflow: hidden;
  padding: 2px 4px 8px 0;
}

.title-line-inner {
  display: block;
  transform: translateY(115%);
  opacity: 0;
}

@keyframes lineRiseUp {
  from {
    transform: translateY(115%);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

.hero-slide.active .title-line:nth-child(1) .title-line-inner {
  animation: lineRiseUp 0.68s var(--ease) 0.14s forwards;
}

.hero-slide.active .title-line:nth-child(2) .title-line-inner {
  animation: lineRiseUp 0.68s var(--ease) 0.28s forwards;
}

@keyframes btnRiseUp {
  from {
    transform: translateY(26px);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

.hero-capsule-btn {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 15px 34px;
  border-radius: var(--radius-pill);
  background: var(--zq-gradient);
  color: #ffffff;
  font-size: 16px;
  font-weight: 600;
  letter-spacing: 0.5px;
  box-shadow: 0 12px 28px rgba(0, 119, 216, 0.28);
  opacity: 0;
  transform: translateY(26px);
  transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease);
}

.hero-slide.active .hero-capsule-btn {
  animation: btnRiseUp 0.65s var(--ease) 0.42s forwards;
}

.hero-capsule-btn:hover {
  transform: translateY(-3px) !important;
  box-shadow: 0 16px 34px rgba(0, 119, 216, 0.38);
}

.hero-capsule-btn svg {
  width: 19px;
  height: 19px;
  transition: transform 0.28s var(--ease);
}

.hero-capsule-btn:hover svg {
  transform: translateX(4px);
}

/* 底部简洁圆点指示器（无外框、无进度条） */
.hero-dots {
  position: absolute;
  left: 50%;
  bottom: 32px;
  transform: translateX(-50%);
  z-index: 5;
  display: inline-flex;
  align-items: center;
  gap: 12px;
}

.hero-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.55);
  box-shadow: 0 1px 6px rgba(20, 43, 72, 0.25);
  transition: background 0.28s var(--ease), transform 0.28s var(--ease);
}

.hero-dot:hover {
  background: rgba(255, 255, 255, 0.85);
}

.hero-dot.active {
  background: #ffffff;
  transform: scale(1.25);
}

/* ==========================================================================
   通用区块排版
   ========================================================================== */
.section {
  padding: 146px 0;
}

.section-head {
  max-width: 720px;
  margin: 0 auto 56px;
  text-align: center;
}

.section-eyebrow {
  display: inline-block;
  padding: 6px 16px;
  border-radius: var(--radius-pill);
  background: var(--bg-ice);
  border: 1px solid #d4e8fa;
  color: var(--zq-blue);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 1.6px;
  margin-bottom: 14px;
}

.section-title {
  font-size: clamp(28px, 3.2vw, 38px);
  font-weight: 800;
  color: var(--text-heading);
  line-height: 1.28;
  letter-spacing: 0.4px;
}

.section-subtitle {
  margin-top: 14px;
  font-size: 16px;
  color: var(--text-muted);
  line-height: 1.75;
}

/* ==========================================================================
   3. 核心业务矩阵（全屏主图联动切换 + 图标与主标题 + 悬浮蓝色竖条遮罩）
   ========================================================================== */
.business-section {
  background: #ffffff;
  padding-top: 116px;
  padding-bottom: 0;
}

.business-head {
  max-width: 100%;
  margin: 0 0 56px 0;
  text-align: left;
}

.business-lead-title {
  font-size: clamp(34px, 3.4vw, 44px);
  font-weight: 800;
  color: #162b48;
  line-height: 1.32;
  letter-spacing: 0.4px;
}

.biz-stage {
  position: relative;
  width: 100%;
  height: 680px;
  overflow: hidden;
  background: #dce8f5;
}

.biz-bg-list {
  position: absolute;
  inset: 0;
  z-index: 1;
}

.biz-bg-slide {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  opacity: 0;
  transform: scale(1.04);
  transition: opacity 0.6s var(--ease), transform 0.85s var(--ease);
}

.biz-bg-slide.active {
  opacity: 1;
  transform: scale(1);
}

/* 底部通透轻柔渐变，保证未悬浮列白色图标与标题在亮图上依然清晰 */
.biz-bg-list::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(
    180deg,
    rgba(22, 43, 72, 0.08) 0%,
    rgba(22, 43, 72, 0.14) 55%,
    rgba(22, 43, 72, 0.52) 100%
  );
  pointer-events: none;
}

.biz-cols-container {
  position: relative;
  z-index: 2;
  height: 100%;
}

.biz-cols-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  height: 100%;
}

.biz-col {
  position: relative;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-end;
  padding: 48px 18px 56px;
  text-align: center;
  color: #ffffff;
  cursor: pointer;
  outline: none;
  overflow: hidden;
}

/* 悬浮/选中时的通顶蓝色竖条半透明遮罩 */
.biz-col::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(
    180deg,
    rgba(13, 82, 168, 0.84) 0%,
    rgba(18, 96, 190, 0.88) 100%
  );
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  opacity: 0;
  transition: opacity 0.36s var(--ease);
  z-index: 0;
}

.biz-col.active::before,
.biz-col:hover::before {
  opacity: 1;
}

.biz-col-content {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  transform: translateY(0);
  transition: transform 0.44s var(--ease);
}

/* 激活/悬浮时，图标与主标题上移至蓝色竖条中央偏上位置（参考中科星图交互） */
.biz-col.active .biz-col-content,
.biz-col:hover .biz-col-content {
  transform: translateY(-210px);
}

/* 激活竖条下方装饰十字准星，与参考样式一致 */
.biz-col-content::after {
  content: "+";
  display: block;
  margin-top: 32px;
  font-size: 36px;
  font-weight: 200;
  line-height: 1;
  color: rgba(255, 255, 255, 0.88);
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.34s var(--ease), transform 0.38s var(--ease);
}

.biz-col.active .biz-col-content::after,
.biz-col:hover .biz-col-content::after {
  opacity: 1;
  transform: translateY(0);
}

.biz-col-icon {
  width: 46px;
  height: 46px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: #ffffff;
}

.biz-col-icon svg {
  width: 100%;
  height: 100%;
}

.biz-col-title {
  font-size: 18px;
  font-weight: 600;
  color: #ffffff;
  line-height: 1.45;
  letter-spacing: 0.5px;
}

/* ==========================================================================
   3. 智慧生活与多元产品生态（左竖排手风琴下拉展开 + 右侧大图轮播联动）
   ========================================================================== */
.ecosystem-section {
  background: var(--bg-soft);
}

.eco-header-row {
  margin-bottom: 60px;
}

.eco-header-row .section-title {
  font-size: clamp(34px, 3.4vw, 44px);
  color: #162b48;
  line-height: 1.32;
}

.eco-showcase {
  display: grid;
  grid-template-columns: 1fr 380px;
  min-height: 520px;
  background: #ffffff;
  border-radius: 0;
  border: 1px solid var(--border-light);
  box-shadow: 0 12px 36px rgba(20, 63, 140, 0.07);
  overflow: hidden;
}

.eco-accordion {
  display: flex;
  flex-direction: column;
  background: #ffffff;
  border-left: 1px solid var(--border-light);
}

.eco-acc-item {
  border-bottom: 1px solid #edf3f9;
  transition: background 0.3s var(--ease);
}

.eco-acc-item:last-child {
  border-bottom: none;
}

.eco-acc-item.active {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  background: linear-gradient(180deg, #ffffff 0%, #f8fbff 100%);
}

.eco-acc-trigger {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 26px 36px;
  text-align: left;
  cursor: pointer;
  transition: padding 0.3s var(--ease);
}

.eco-acc-item.active .eco-acc-trigger {
  padding: 32px 36px 14px;
}

.eco-acc-title {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-heading);
  line-height: 1.35;
  transition: color 0.28s var(--ease), font-size 0.28s var(--ease);
}

.eco-acc-item:hover .eco-acc-title {
  color: var(--zq-blue);
}

.eco-acc-item.active .eco-acc-title {
  font-size: 24px;
  font-weight: 800;
  color: var(--zq-blue-deep);
}

.eco-acc-chevron {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  color: #6e849e;
  transition: transform 0.32s var(--ease), color 0.28s var(--ease);
}

.eco-acc-item.active .eco-acc-chevron {
  transform: rotate(90deg);
  color: var(--zq-blue-deep);
}

/* 未点击项保持收起，点击项平滑下拉展开小字介绍 */
.eco-acc-dropdown {
  display: grid;
  grid-template-rows: 0fr;
  opacity: 0;
  transition: grid-template-rows 0.36s var(--ease), opacity 0.3s var(--ease);
}

.eco-acc-item.active .eco-acc-dropdown {
  grid-template-rows: 1fr;
  opacity: 1;
}

.eco-acc-dropdown-inner {
  overflow: hidden;
}

.eco-acc-desc {
  padding: 0 36px 32px;
  font-size: 14.5px;
  color: var(--text-body);
  line-height: 1.82;
}

/* 右侧对应图片播放视窗 */
.eco-stage {
  position: relative;
  width: 100%;
  height: 100%;
  min-height: 520px;
  background: var(--bg-ice);
  overflow: hidden;
}

.eco-stage-slide {
  position: absolute;
  inset: 0;
  opacity: 0;
  visibility: hidden;
  z-index: 1;
  transition: opacity 0.52s var(--ease), visibility 0.52s var(--ease);
}

.eco-stage-slide.active {
  opacity: 1;
  visibility: visible;
  z-index: 2;
}

.eco-stage-slide img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transform: scale(1.04);
  transition: transform 0.75s var(--ease);
}

.eco-stage-slide.active img {
  transform: scale(1);
}

/* ==========================================================================
   4. 服务体系（清爽冰蓝底色 + 四步流程卡片）
   ========================================================================== */
.capabilities-section {
  background: linear-gradient(180deg, var(--bg-ice) 0%, var(--bg-mint) 100%);
}

.capabilities-section .section-title {
  font-size: clamp(34px, 3.4vw, 44px);
  color: #162b48;
  line-height: 1.32;
}

.cap-steps-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.cap-step-card {
  border-radius: 0;
  background: var(--bg-white);
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-xs);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: transform 0.32s var(--ease), box-shadow 0.32s var(--ease);
}

.cap-step-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-md);
}

.cap-step-img {
  width: 100%;
  height: 196px;
  overflow: hidden;
  background: var(--bg-ice);
}

.cap-step-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.55s var(--ease);
}

.cap-step-card:hover .cap-step-img img {
  transform: scale(1.06);
}

.cap-step-body {
  padding: 24px 24px 26px;
}

.cap-step-card h3 {
  font-size: 18.5px;
  font-weight: 700;
  color: var(--text-heading);
  margin-bottom: 8px;
}

.cap-step-card p {
  font-size: 14.5px;
  color: var(--text-body);
  line-height: 1.68;
}

/* ==========================================================================
   5. 关于卓仟（明快企业风采展示，无地址、无电话、无钢印）
   ========================================================================== */
.about-section {
  background: var(--bg-white);
}

.about-grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 56px;
  align-items: center;
}

.about-content .section-title {
  font-size: clamp(34px, 3.4vw, 44px);
  color: #162b48;
  line-height: 1.32;
  margin-bottom: 22px;
}

.about-p {
  font-size: 15.8px;
  color: var(--text-body);
  line-height: 1.85;
  margin-bottom: 18px;
}

.about-p strong {
  color: var(--text-heading);
  font-weight: 700;
}

.about-metrics {
  margin-top: 34px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.metric-card {
  padding: 20px 18px;
  border-radius: var(--radius-sm);
  background: var(--bg-soft);
  border: 1px solid var(--border-light);
}

.metric-val {
  font-size: 30px;
  font-weight: 800;
  color: var(--zq-blue);
  line-height: 1.15;
}

.metric-val span {
  font-size: 14px;
  font-weight: 600;
  margin-left: 3px;
  color: var(--zq-green);
}

.metric-name {
  margin-top: 6px;
  font-size: 13.5px;
  color: var(--text-muted);
  font-weight: 600;
}

.about-img-frame {
  position: relative;
  border-radius: 0;
  overflow: visible;
}

.about-img-frame > img {
  width: 100%;
  height: 440px;
  object-fit: cover;
  border-radius: 0;
  box-shadow: var(--shadow-md);
  border: 6px solid var(--bg-soft);
}

.about-float-card {
  position: absolute;
  left: -22px;
  bottom: 26px;
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px 22px;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(14px);
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-md);
}

.float-logo {
  width: 38px;
  height: 38px;
  object-fit: contain;
}

.about-float-card strong {
  display: block;
  font-size: 15px;
  color: var(--text-heading);
}

.about-float-card span {
  font-size: 12.5px;
  color: var(--text-muted);
}

/* ==========================================================================
   页脚（品牌蓝色底色，规范展示ICP备案号）
   ========================================================================== */
.site-footer {
  background: linear-gradient(135deg, #143f8c 0%, #0077d8 100%);
  border-top: none;
  padding: 64px 0 32px;
  color: rgba(255, 255, 255, 0.88);
}

.footer-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 48px;
  padding-bottom: 42px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.18);
}

.footer-desc {
  margin-top: 16px;
  max-width: 380px;
  font-size: 14px;
  color: rgba(255, 255, 255, 0.82);
  line-height: 1.75;
}

.footer-columns {
  display: flex;
  justify-content: flex-end;
  gap: 126px;
  margin-left: auto;
}

.footer-col h4 {
  font-size: 15.5px;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 16px;
}

.footer-col ul {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-col a {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.82);
}

.footer-col a:hover {
  color: #ffffff;
  transform: translateX(3px);
  display: inline-block;
}

.footer-bottom {
  padding-top: 26px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 13.5px;
  color: rgba(255, 255, 255, 0.82);
}

.icp-link {
  color: #ffffff;
}

.icp-link:hover {
  color: #ffffff;
  opacity: 0.85;
}

/* 返回顶部浅色按钮 */
.back-top-btn {
  position: fixed;
  right: 28px;
  bottom: 30px;
  z-index: 900;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: var(--bg-white);
  color: var(--zq-blue);
  border: 1px solid var(--border-hover);
  box-shadow: var(--shadow-md);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: all 0.3s var(--ease);
}

.back-top-btn.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-top-btn:hover {
  background: var(--zq-gradient);
  color: #ffffff;
  border-color: transparent;
}

.back-top-btn svg {
  width: 20px;
  height: 20px;
}

/* ==========================================================================
   响应式适配
   ========================================================================== */
@media (max-width: 1024px) {
  .biz-stage {
    height: auto;
    min-height: 520px;
  }

  .biz-cols-grid {
    grid-template-columns: repeat(3, 1fr);
    min-height: 520px;
  }

  .biz-col {
    justify-content: center;
    padding: 36px 16px;
  }

  .biz-col.active .biz-col-content,
  .biz-col:hover .biz-col-content {
    transform: translateY(0);
  }

  .biz-col-content::after {
    display: none;
  }

  .cap-steps-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .eco-showcase {
    grid-template-columns: 1fr;
    min-height: auto;
  }

  .eco-accordion {
    border-left: none;
    border-top: 1px solid var(--border-light);
  }

  .eco-stage {
    min-height: 320px;
  }

  .about-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .about-float-card {
    left: 16px;
  }

  .footer-top {
    flex-direction: column;
  }

  .footer-columns {
    margin-left: 0;
    width: 100%;
    justify-content: space-between;
  }
}

@media (max-width: 768px) {
  :root {
    --header-h: 68px;
  }

  .mobile-menu-btn {
    display: inline-flex;
  }

  .nav-menu {
    position: fixed;
    top: var(--header-h);
    left: 16px;
    right: 16px;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    border-radius: var(--radius-md);
    padding: 14px 16px;
    background: #ffffff;
    box-shadow: var(--shadow-md);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.28s var(--ease);
  }

  .nav-menu.open {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }

  .nav-link {
    color: var(--text-body);
    text-shadow: none;
    padding: 10px 8px;
  }

  .nav-link:hover,
  .nav-link.active {
    color: var(--zq-blue);
  }

  .nav-link::after {
    background: var(--zq-blue);
  }

  .hero-section {
    min-height: 550px;
  }

  .section {
    padding: 118px 0;
  }

  .business-section {
    padding-top: 88px;
    padding-bottom: 0;
  }

  .biz-cols-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .cap-steps-grid,
  .about-metrics {
    grid-template-columns: 1fr;
  }

  .footer-columns {
    flex-direction: column;
    gap: 28px;
  }

  .brand-cn {
    font-size: 16px;
  }
}