/**
 * 自适应基准：设计稿宽度 1920px；Banner 区域 proportion 1920×1080
 */

:root {
  --design-width: 1920;
  --scene-section-min-h: 1330px;
  --scene-gap: clamp(16px, calc(100vw / var(--design-width) * 35), 35px);
  --scene-gap-row: clamp(12px, calc(100vw / var(--design-width) * 37), 37px);
  --scene-pad-x: clamp(1rem, calc(100vw / var(--design-width) * 214), 214px);
  --academic-pad-x: clamp(1rem, calc(100vw / var(--design-width) * 354), 354px);
  --academic-section-min-h: 1658px;
  --sales-design-w: 1980;
  --sales-pad-x: clamp(1rem, calc(100vw / var(--sales-design-w) * 133), 133px);
  --sales-section-min-h: 1330px;
  --banner-ratio-w: 1920;
  --banner-ratio-h: 1080;
  --about-hero-w: 1920;
  --about-hero-h: 1227;
  --color-bg: #ffffff;
  --color-text: #1a1d24;
  --color-text-muted: #6b7280;
  /* --color-accent-purple: #7c3aed; */
  --color-accent-green: #A5CE4C;
  /* 导航：设计稿高度 98px、字号 24px */
  --nav-h: clamp(3rem, calc(100vw / var(--design-width) * 98), 98px);
  --nav-font: clamp(14px, calc(100vw / var(--design-width) * 24), 24px);
  /* 固定顶栏占位 / 锚点滚动偏移（与 .site-header 实际高度一致） */
  --site-header-offset: var(--nav-h);
  /* Banner：扣除顶栏后的可视一屏高度 */
  --banner-viewport-h: calc(100vh - var(--site-header-offset));
  /* 关于我们：锚点已避开顶栏，区块本身占满一屏 */
  --about-viewport-h: 100vh;
}

@supports (height: 100svh) {
  :root {
    --banner-viewport-h: calc(100svh - var(--site-header-offset));
    --about-viewport-h: 100svh;
  }
}

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

html {
  font-size: clamp(14px, calc(100vw / var(--design-width) * 16), 18px);
  -webkit-text-size-adjust: 100%;
}

@media (prefers-reduced-motion: no-preference) {
  html {
    scroll-behavior: smooth;
  }
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue",
    Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
}

/* 固定顶栏后，锚点目标不被遮挡 */
[id] {
  scroll-margin-top: var(--site-header-offset);
}

.ch__sub {
  color: #ccc !important;
  margin-top: -10px !important;
}

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

a {
  color: inherit;
  text-decoration: none;
}

.shell {
  width: min(100%, calc(var(--design-width) * 1px));
  margin-inline: auto;
  padding-inline: clamp(1rem, calc(100vw / var(--design-width) * 48), 3rem);
}

/* ========== 顶栏（设计稿 98px 高 / 24px 字） ========== */

.hero-stack {
  position: relative;
  /* 为 position:fixed 的顶栏留出首屏空间，避免 Banner 被挡 */
  padding-top: var(--site-header-offset);
  /* 首屏锚点 #home 总高度 = 顶栏占位 + Banner 一屏 */
  min-height: 100vh;
  min-height: 100svh;
}

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  width: 100%;
  height: var(--nav-h);
  background: #000;
  border: none;
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.06);
}

.site-header .shell {
  flex: 1;
  width: 100%;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: clamp(0.75rem, 2vw, 2rem);
  min-height: 100%;
}

.logo-link {
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

.logo-img {
  height: clamp(1.75rem, calc(100vw / var(--design-width) * 52), 3.25rem);
  width: auto;
  max-width: none;
}

.header-right {
  display: flex;
  align-items: center;
  gap: clamp(1rem, calc(100vw / var(--design-width) * 40), 2.5rem);
  min-width: 0;
}

.nav--hero {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: clamp(0.5rem, calc(100vw / var(--design-width) * 51), 51px);
  align-items: center;
}

.nav--hero a {
  color: rgba(255, 255, 255, 0.92);
  font-size: var(--nav-font);
  font-weight: 400;
  white-space: nowrap;
}

.nav--hero a:hover {
  color: #ffffff;
}

.lang-menu {
  position: relative;
  flex-shrink: 0;
}

.lang-toggle {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0.35rem;
  margin: 0;
  border: none;
  border-radius: 0.375rem;
  background: rgba(255, 255, 255, 0.15);
  backdrop-filter: blur(8px);
  cursor: pointer;
  transition: background 0.2s ease;
}

.lang-toggle:hover {
  background: rgba(255, 255, 255, 0.28);
}

.lang-toggle__icon {
  height: clamp(1.125rem, calc(100vw / var(--design-width) * 28), 1.625rem);
  width: auto;
  max-width: none;
}

.lang-menu__panel {
  position: absolute;
  top: calc(100% + 0.35rem);
  right: 0;
  z-index: 200;
  min-width: 8.75rem;
  padding: 0.35rem;
  margin: 0;
  border-radius: 0.5rem;
  background: rgba(26, 29, 36, 0.98);
  border: 1px solid rgba(255, 255, 255, 0.12);
  box-shadow: 0 10px 28px rgba(0, 0, 0, 0.4);
}

.lang-menu__option {
  display: block;
  width: 100%;
  margin: 0;
  padding: 0.5rem 0.75rem;
  border: none;
  border-radius: 0.35rem;
  background: transparent;
  color: rgba(255, 255, 255, 0.92);
  font: inherit;
  font-size: clamp(0.875rem, calc(100vw / var(--design-width) * 18), 1rem);
  text-align: left;
  cursor: pointer;
  transition: background 0.15s ease, color 0.15s ease;
}

.lang-menu__option:hover {
  background: rgba(255, 255, 255, 0.1);
  color: #ffffff;
}

.lang-menu__option.is-active {
  color: var(--color-accent-green);
  font-weight: 500;
}

.lang-menu__option:focus-visible {
  outline: 2px solid #fff;
  outline-offset: 1px;
}

@media (max-width: 900px) {
  :root {
    /* 窄屏顶栏为两行（Logo+语言 / 导航），略高于 --nav-h */
    --site-header-offset: calc(var(--nav-h) + 2.85rem);
  }

  .site-header {
    height: auto;
    min-height: var(--nav-h);
    align-items: stretch;
    padding-block: 0.35rem 0.45rem;
  }

  .header-inner {
    flex-wrap: wrap;
    align-items: center;
    row-gap: 0.5rem;
  }

  /* 解构右侧容器：便于第一行 Logo + 语言，第二行整宽导航锚点 */
  .header-right {
    display: contents;
  }

  .logo-link {
    order: 1;
  }

  .lang-menu {
    order: 2;
    margin-left: auto;
  }

  .nav--hero {
    order: 3;
    flex: 1 1 100%;
    width: 100%;
    justify-content: center;
    flex-wrap: wrap;
    gap: clamp(0.35rem, 2vw, 0.65rem) clamp(0.5rem, 3vw, 1rem);
    padding-block: 0.5rem 0 0;
    border-top: 1px solid rgba(255, 255, 255, 0.12);
  }

  .nav--hero a {
    font-size: clamp(0.6875rem, calc(100vw / var(--design-width) * 18), 0.875rem);
  }
}

/* ========== Banner：设计稿 1920×1080 ========== */

.banner {
  position: relative;
  width: 100%;
  height: var(--banner-viewport-h);
  min-height: 0;
}

.banner__frame {
  position: relative;
  width: 100%;
  height: 100%;
  overflow: hidden;
}

/* Swiper Banner */
.banner-swiper {
  position: absolute;
  inset: 0;
  z-index: 0;
  width: 100%;
  height: 100%;
}

.banner-swiper .swiper-wrapper,
.banner-swiper .swiper-slide {
  height: 100%;
}

.banner__slide-bg {
  width: 100%;
  height: 100%;
  min-height: 100%;
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
}

.banner__scrim {
  position: absolute;
  inset: 0;
  z-index: 2;
  background: linear-gradient(to top,
      rgba(0, 0, 0, 0.45) 0%,
      rgba(0, 0, 0, 0.08) 45%,
      rgba(0, 0, 0, 0.15) 100%);
  pointer-events: none;
}

.banner__content {
  position: absolute;
  inset: 0;
  z-index: 3;
  display: flex;
  align-items: flex-end;
  justify-content: flex-end;
  padding: clamp(1.25rem, 4vh, 2.5rem) clamp(1rem, calc(100vw / var(--design-width) * 48), 3rem);
  padding-bottom: clamp(3.5rem, 10vh, 5.5rem);
  pointer-events: none;
}

.banner__text {
  text-align: right;
  max-width: min(100%, 42rem);
  pointer-events: auto;
}

.banner__title {
  margin: 0 0 clamp(0.35rem, 1.2vh, 0.75rem);
  font-size: clamp(1.5rem, calc(100vw / var(--design-width) * 56), 3.25rem);
  font-weight: 400;
  letter-spacing: clamp(0.12em, calc(100vw / var(--design-width) * 0.5em), 0.5em);
  color: #ffffff;
  text-shadow: 0 4px 28px rgba(0, 0, 0, 0.45);
  letter-spacing: 10px;
}



html[lang="en"] .banner__title {
  display: none;
}

.banner__subtitle {
  margin: 0;
  font-size: clamp(0.8125rem, calc(100vw / var(--design-width) * 20), 1.125rem);
  line-height: 1.45;
  color: rgba(255, 255, 255, 0.92);
  text-shadow: 0 2px 16px rgba(0, 0, 0, 0.4);
  text-align: right;
  letter-spacing: clamp(0.5px, 0.08vw, 1.5px);
  margin-left: clamp(0.25rem, 0.5vw, 10px);
  margin-right: 10px;
}

.banner__dots,
.banner-swiper__pagination.swiper-pagination {
  position: absolute;
  left: auto;
  right: clamp(1rem, calc(100vw / var(--design-width) * 48), 3rem);
  bottom: clamp(1rem, 4vh, 2rem);
  transform: none;
  z-index: 5;
  pointer-events: auto;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: clamp(6px, calc(100vw / var(--design-width) * 30), 30px);
  width: auto !important;
  height: auto;
  margin: 0 !important;
  padding: 0;
  background: transparent;
  overflow: visible;
}

.banner__dot,
.banner__dots .swiper-pagination-bullet {
  position: relative;
  flex: 0 0 auto;
  box-sizing: border-box;
  width: clamp(40px, calc(100vw / var(--design-width) * 120), 120px) !important;
  min-width: clamp(40px, calc(100vw / var(--design-width) * 120), 120px);
  max-width: clamp(40px, calc(100vw / var(--design-width) * 120), 120px);
  height: 3px !important;
  min-height: 3px !important;
  max-height: 3px !important;
  margin: 0 !important;
  padding: 0 !important;
  border: none;
  border-radius: 2px;
  line-height: 0;
  font-size: 0;
  background: rgba(255, 255, 255, 0.35);
  cursor: pointer;
  opacity: 1 !important;
  pointer-events: auto;
  touch-action: manipulation;
}

/* 扩大点击区域，不改变横线视觉宽高 */
.banner__dot::before,
.banner__dots .swiper-pagination-bullet::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 50%;
  height: 24px;
  transform: translateY(-50%);
}

.banner__dot.is-active,
.banner__dot.swiper-pagination-bullet-active,
.banner__dots .swiper-pagination-bullet-active {
  background: var(--color-accent-green);
}

.banner__dot:focus-visible {
  outline: 2px solid #fff;
  outline-offset: 2px;
}

/* ========== 产品展示区 ========== */

.product-showcase {
  padding-block: clamp(2.5rem, calc(100vw / var(--design-width) * 80), 4.5rem);
  background: #ffffff;
}

.product-slide__inner {
  text-align: center;
}

.product-showcase__title {
  margin: 0 0 0.5rem;
  font-size: clamp(1.375rem, calc(100vw / var(--design-width) * 40), 2.25rem);
  font-weight: 400;
  line-height: 1.25;
  letter-spacing: 0.02em;
}

.product-showcase__subtitle {
  margin: 0 0 1rem;
  font-size: clamp(0.875rem, calc(100vw / var(--design-width) * 22), 1.125rem);
  color: var(--color-text-muted);
}

html[lang="en"] .product-showcase__subtitle {
  display: none;
}

.product-showcase__desc {
  margin: 0 auto 2rem;
  max-width: 46rem;
  font-size: clamp(0.8125rem, calc(100vw / var(--design-width) * 18), 0.9375rem);
  color: var(--color-text-muted);
  line-height: 1.65;
}

.product-carousel {
  position: relative;
  display: flex;
  align-items: center;
  gap: clamp(0.5rem, 2vw, 1.25rem);
  margin-inline: auto;
  max-width: min(100%, calc(var(--design-width) * 1px));
}

.product-carousel__viewport {
  flex: 1;
  min-width: 0;
  overflow: hidden;
}

.product-swiper {
  width: 100%;
  overflow: hidden;
}

.product-swiper .swiper-wrapper {
  transition-timing-function: cubic-bezier(0.33, 1, 0.68, 1);
}

.product-swiper .swiper-slide {
  height: auto;
}

/* 左箭头：新页从左往右滑入；右箭头：新页从右往左滑入（配合 Swiper 横向位移） */
.product-carousel[data-slide-dir="prev"] .swiper-slide-active .product-slide__inner {
  animation: product-enter-from-left 0.52s cubic-bezier(0.33, 1, 0.68, 1) both;
}

.product-carousel[data-slide-dir="next"] .swiper-slide-active .product-slide__inner {
  animation: product-enter-from-right 0.52s cubic-bezier(0.33, 1, 0.68, 1) both;
}

@keyframes product-enter-from-left {
  from {
    transform: translateX(-12%);
    opacity: 0.35;
  }

  to {
    transform: translateX(0);
    opacity: 1;
  }
}

@keyframes product-enter-from-right {
  from {
    transform: translateX(12%);
    opacity: 0.35;
  }

  to {
    transform: translateX(0);
    opacity: 1;
  }
}

@media (prefers-reduced-motion: reduce) {
  .product-carousel[data-slide-dir] .swiper-slide-active .product-slide__inner {
    animation: none;
  }

  .product-swiper .swiper-wrapper {
    transition-duration: 0.01ms !important;
  }
}

.product-showcase__frame {
  margin-inline: auto;
  width: 100%;
  max-width: min(100%, calc(var(--design-width) * 1px - 6rem));
  aspect-ratio: var(--banner-ratio-w) / var(--banner-ratio-h);
  position: relative;
  border-radius: 0.5rem;
  overflow: hidden;
  background: #fff;
}

.carousel-image {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.carousel-arrow {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  width: clamp(2rem, 5vw, 3rem);
  padding: 0;
  border: none;
  background: transparent;
  cursor: pointer;
  opacity: 0.75;
  transition: opacity 0.2s ease;
}

.carousel-arrow:hover {
  opacity: 1;
}

.carousel-arrow img {
  display: block;
  width: clamp(11px, calc(100vw / var(--design-width) * 15), 15px);
  height: clamp(27px, calc(100vw / var(--design-width) * 37), 37px);
  object-fit: contain;
}

@media (max-width: 520px) {
  .carousel-arrow {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    z-index: 2;
  }

  .carousel-arrow--prev {
    left: 0;
  }

  .carousel-arrow--next {
    right: 0;
  }

  .product-carousel {
    padding-inline: 1.75rem;
  }
}

/* ========== 全场景充电服务 ========== */

.scene-service {
  background: #f9f9f9;
  padding-block: clamp(2rem, calc(100vw / var(--design-width) * 80), 5rem);
}

@media (min-width: 1920px) {
  .scene-service {
    min-height: var(--scene-section-min-h);
  }
}

.scene-service__header {
  text-align: center;
  margin-bottom: clamp(1.5rem, calc(100vw / var(--design-width) * 56), 3rem);
}

.scene-service__title {
  margin: 0 0 0.5rem;
  font-size: clamp(1.375rem, calc(100vw / var(--design-width) * 40), 2.25rem);
  font-weight: 400;
  color: var(--color-text);
}

.scene-service__subtitle {
  margin: 0 0 1rem;
  font-size: clamp(0.875rem, calc(100vw / var(--design-width) * 22), 1.125rem);
  color: var(--color-text-muted);
}

html[lang="en"] .scene-service__subtitle {
  display: none;
}

.scene-service__lead {
  margin: 0;
  font-size: clamp(0.8125rem, calc(100vw / var(--design-width) * 18), 1rem);
  line-height: 1.75;
  color: var(--color-text-muted);
}

.scene-service .shell {
  padding-inline: var(--scene-pad-x);
}

/* 左稿比例定高；右侧 flex 拉伸与左侧同高，内部 1fr 均分行高 */
.scene-grid {
  display: flex;
  flex-wrap: nowrap;
  align-items: stretch;
  gap: var(--scene-gap);
  min-width: 0;
}

.scene-grid__lead {
  flex: 0 1 475px;
  width: min(475px, 38vw);
  max-width: 475px;
  min-width: 0;
  display: flex;
  flex-direction: column;
}

.scene-grid__lead .scene-card--tall {
  flex: none;
  width: 100%;
}

.scene-grid__lead .scene-card__media {
  position: relative;
  width: 100%;
  height: 0;
  padding-bottom: calc(748 / 475 * 100%);
  overflow: hidden;
}

.scene-grid__lead .scene-card__media img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.scene-grid__quad {
  flex: 1;
  min-width: 0;
  min-height: 100%;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  grid-template-rows: repeat(2, minmax(0, 1fr));
  gap: var(--scene-gap-row) var(--scene-gap);
}

.scene-grid__quad .scene-card {
  display: flex;
  flex-direction: column;
  min-height: 0;
  height: 100%;
}

.scene-grid__quad .scene-card__media {
  flex: 1;
  min-height: 0;
}

.scene-card__media {
  position: relative;
  overflow: hidden;
  border-radius: 10px;
}

.scene-card__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.scene-card--small .scene-card__media {
  height: 100%;
}

.scene-card__caption {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  margin: 0;
  padding: clamp(0.75rem, calc(100vw / var(--design-width) * 24), 1.25rem) clamp(0.75rem, calc(100vw / var(--design-width) * 28), 1.5rem);
  font-size: clamp(0.8125rem, calc(100vw / var(--design-width) * 18), 1rem);
  font-weight: 500;
  line-height: 1.45;
  color: #ffffff;
  text-align: left;
  text-shadow: 0 1px 8px rgba(0, 0, 0, 0.45);
  background: linear-gradient(to top,
      rgba(0, 0, 0, 0.72) 0%,
      rgba(0, 0, 0, 0.25) 55%,
      transparent 100%);
}

.scene-card--caption-br .scene-card__caption {
  text-align: right;
}

@media (max-width: 900px) {
  .scene-grid {
    flex-direction: column;
    flex-wrap: wrap;
    gap: var(--scene-gap);
  }

  .scene-grid__lead {
    flex: none;
    width: 100%;
    max-width: none;
  }

  .scene-grid__lead .scene-card--tall {
    flex: none;
  }

  .scene-grid__quad {
    flex: none;
    width: 100%;
    min-height: 0;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    grid-template-rows: none;
    gap: var(--scene-gap-row) var(--scene-gap);
  }

  .scene-grid__quad .scene-card {
    height: auto;
  }

  .scene-grid__quad .scene-card__media {
    flex: none;
    aspect-ratio: 476 / 355;
    height: auto;
  }
}

@media (max-width: 520px) {
  .scene-grid__quad {
    grid-template-columns: 1fr;
  }
}

/* ========== 售后服务 ========== */

.after-sales {
  background: #ffffff;
  padding-block: clamp(2rem, calc(100vw / var(--design-width) * 80), 5rem);
}

@media (min-width: 1920px) {
  .after-sales {
    min-height: var(--scene-section-min-h);
  }
}

.after-sales .shell {
  padding-inline: var(--scene-pad-x);
}

.after-sales__header {
  text-align: center;
  margin-bottom: clamp(1.5rem, calc(100vw / var(--design-width) * 56), 3rem);
}

.after-sales__title {
  margin: 0 0 0.5rem;
  font-size: clamp(1.375rem, calc(100vw / var(--design-width) * 40), 2.25rem);
  font-weight: 400;
  color: var(--color-text);
}

.after-sales__subtitle {
  margin: 0;
  font-size: clamp(0.875rem, calc(100vw / var(--design-width) * 22), 1.125rem);
  color: var(--color-text-muted);
}

html[lang="en"] .after-sales__subtitle {
  display: none;
}

.after-sales__grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--scene-gap);
}

.after-sales-card__media {
  position: relative;
  overflow: hidden;
  border-radius: 12px;
  aspect-ratio: 16 / 9;
}

.after-sales-card__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.after-sales-card__title {
  margin: clamp(1rem, calc(100vw / var(--design-width) * 24), 1.25rem) 0 0.5rem;
  font-size: clamp(1rem, calc(100vw / var(--design-width) * 22), 1.25rem);
  font-weight: 400;
  color: var(--color-text);
  text-align: left;
}

.after-sales-card__desc {
  margin: 0;
  font-size: clamp(0.8125rem, calc(100vw / var(--design-width) * 18), 1rem);
  line-height: 1.65;
  color: var(--color-text-muted);
  text-align: left;
}

@media (max-width: 640px) {
  .after-sales__grid {
    grid-template-columns: 1fr;
  }
}

/* ========== 重磅学术加持 ========== */

.academic {
  background: #f9f9f9;
  padding-block: clamp(2rem, calc(100vw / var(--design-width) * 96), 5rem);
}

@media (min-width: 1920px) {
  .academic {
    min-height: var(--academic-section-min-h);
  }
}

.academic .shell {
  padding-inline: var(--academic-pad-x);
}

.academic__header {
  text-align: center;
  margin-bottom: clamp(2rem, calc(100vw / var(--design-width) * 64), 4rem);
}

.academic__title {
  margin: 0 0 0.5rem;
  font-size: clamp(1.375rem, calc(100vw / var(--design-width) * 40), 2.25rem);
  font-weight: 400;
  color: var(--color-text);
}

.academic__subtitle {
  margin: 0 0 1rem;
  font-size: clamp(0.875rem, calc(100vw / var(--design-width) * 22), 1.125rem);
  color: var(--color-text-muted);
}

html[lang="en"] .academic__subtitle {
  display: none;
}

.academic__lead {
  margin: 0 auto;
  max-width: 52rem;
  font-size: clamp(0.8125rem, calc(100vw / var(--design-width) * 18), 1rem);
  line-height: 1.75;
  color: var(--color-text-muted);
}

.academic__blocks {
  display: flex;
  flex-direction: column;
  gap: clamp(1.5rem, calc(100vw / var(--design-width) * 48), 3rem);
}

.academic-row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  align-items: stretch;
  min-height: 0;
}

.academic-row__text {
  background: #ffffff;
  padding: clamp(1.5rem, calc(100vw / var(--design-width) * 48), 3rem);
  display: flex;
  flex-direction: column;
  text-align: left;
  min-height: 0;
}

.academic-row__main {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-height: 0;
}

.academic-row__heading {
  margin: 0 0 1rem;
  font-size: clamp(1.0625rem, calc(100vw / var(--design-width) * 26), 1.375rem);
  font-weight: 400;
  color: var(--color-text);
  line-height: 1.35;
}

.academic-row__body {
  margin: 0;
  font-size: clamp(0.8125rem, calc(100vw / var(--design-width) * 17), 0.9375rem);
  line-height: 1.75;
  color: var(--color-text-muted);
}

.academic-row__meta {
  flex-shrink: 0;
  margin: clamp(1.25rem, calc(100vw / var(--design-width) * 32), 2rem) 0 0;
  align-self: flex-end;
  display: flex;
  align-items: baseline;
  gap: 0;
  letter-spacing: 0.06em;
}

.academic-row__meta-num {
  font-size: clamp(18px, calc(100vw / var(--design-width) * 36), 36px);
  font-weight: 400;
  color: #000000;
  line-height: 1;
}

.academic-row__meta-total {
  font-size: clamp(0.75rem, calc(100vw / var(--design-width) * 14), 0.875rem);
  font-weight: 500;
  color: var(--color-text-muted);
}

.academic-row__media {
  position: relative;
  min-height: 12rem;
  overflow: hidden;
  background: #ececec;
}

.academic-row__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

@media (max-width: 900px) {
  .academic-row {
    grid-template-columns: 1fr;
  }

  .academic-row--text-left .academic-row__media {
    order: 2;
  }

  .academic-row--text-left .academic-row__text {
    order: 1;
  }

  .academic-row__media {
    aspect-ratio: 16 / 10;
    min-height: 0;
  }
}

/* ========== 大客户销售简介 ========== */

.sales-intro {
  background: #ffffff;
  padding-block: clamp(2rem, calc(100vw / var(--sales-design-w) * 80), 5rem);
}

@media (min-width: 1980px) {
  .sales-intro {
    min-height: var(--sales-section-min-h);
  }
}

.sales-intro .shell {
  max-width: min(100%, calc(var(--sales-design-w) * 1px));
  margin-inline: auto;
  padding-inline: var(--sales-pad-x);
}

.sales-intro__header {
  text-align: center;
  margin-bottom: clamp(1.25rem, calc(100vw / var(--sales-design-w) * 40), 2rem);
}

.sales-intro__title {
  margin: 0 0 0.5rem;
  font-size: clamp(1.375rem, calc(100vw / var(--design-width) * 40), 2.25rem);
  font-weight: 400;
  color: var(--color-text);
}

.sales-intro__subtitle {
  margin: 0;
  font-size: clamp(0.875rem, calc(100vw / var(--design-width) * 22), 1.125rem);
  color: var(--color-text-muted);
}

html[lang="en"] .sales-intro__subtitle {
  display: none;
}

.sales-intro__copy {
  margin: 0 auto clamp(1.75rem, calc(100vw / var(--sales-design-w) * 48), 3rem);
  max-width: 52rem;
  text-align: center;
}

.sales-intro__copy p {
  margin: 0 0 1rem;
  font-size: clamp(0.8125rem, calc(100vw / var(--design-width) * 18), 1rem);
  line-height: 1.85;
  color: var(--color-text-muted);
}

.sales-intro__copy p:last-child {
  margin-bottom: 0;
}

.sales-intro__hero {
  margin: 0 auto clamp(2rem, calc(100vw / var(--sales-design-w) * 56), 4rem);
  max-width: min(100%, 1655px);
  border-radius: 12px;
  overflow: hidden;
  aspect-ratio: 1655 / 508;
  background: #f0f0f0;
}

.sales-intro__hero img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.sales-intro__cta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: clamp(1.25rem, calc(100vw / var(--sales-design-w) * 40), 2.5rem);
}

.sales-intro__qr {
  flex-shrink: 0;
  padding: 6px;
  border: 1px solid rgba(26, 29, 36, 0.08);
  border-radius: 10px;
  background: #fff;
}

.sales-intro__qr img {
  display: block;
  width: clamp(7.5rem, 22vw, 10rem);
  height: auto;
  aspect-ratio: 1;
  object-fit: contain;
}

.sales-intro__cta-text {
  flex: 0 1 auto;
  /* max-width: 28rem; */
  text-align: left;
}

.sales-intro__cta-strong {
  margin: 0 0 0.35rem;
  font-size: clamp(0.9375rem, calc(100vw / var(--design-width) * 20), 1.125rem);
  font-weight: 400;
  color: var(--color-text);
  line-height: 1.45;
}

.sales-intro__cta-strong:last-of-type {
  margin-bottom: 0.75rem;
}

.sales-intro__cta-en {
  margin: 0 0 0.35rem;
  font-size: clamp(0.6875rem, calc(100vw / var(--design-width) * 16), 0.8125rem);
  line-height: 1.5;
  color: var(--color-text);
}

.sales-intro__cta-en:last-child {
  margin-bottom: 0;
}

@media (max-width: 520px) {
  .sales-intro__cta {
    flex-direction: column;
  }

  .sales-intro__cta-text {
    max-width: 28rem;
    text-align: center;
  }
}

/* ========== 关于我们 ========== */

.about-hero {
  width: 100%;
  background: #0d0d0d;
  min-height: var(--about-viewport-h);
}

.about-hero__frame {
  position: relative;
  width: 100%;
  height: var(--about-viewport-h);
  min-height: var(--about-viewport-h);
  overflow: hidden;
  display: flex;
  align-items: flex-start;
  justify-content: center;
}

.about-hero__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
}

.about-hero__scrim {
  position: absolute;
  inset: 0;
  background: linear-gradient(to bottom,
      rgba(0, 0, 0, 0.35) 0%,
      rgba(0, 0, 0, 0.08) 38%,
      rgba(0, 0, 0, 0.15) 100%);
  pointer-events: none;
  z-index: 1;
}

.about-hero__content {
  position: relative;
  z-index: 2;
  width: 100%;
  margin-inline: auto;
  /* 与 scene / academic 等区块标题区上内边距一致 */
  padding: clamp(2rem, calc(100vw / var(--design-width) * 80), 5rem) clamp(1rem, calc(100vw / var(--design-width) * 48), 3rem) clamp(1.25rem, 4vh, 2.5rem);
  text-align: center;
  max-width: calc(var(--design-width) * 1px);
}

.about-hero__title {
  margin: 0 0 clamp(0.35rem, 1.2vh, 0.75rem);
  font-size: clamp(1.5rem, calc(100vw / var(--design-width) * 48), 3rem);
  font-weight: 400;
  line-height: 1.2;
  color: #ffffff;
  text-shadow: 0 4px 24px rgba(0, 0, 0, 0.45);
}

.about-hero__subtitle {
  margin: 0 0 clamp(0.5rem, 1.5vh, 0.75rem);
  font-size: clamp(0.8125rem, calc(100vw / var(--design-width) * 18), 1rem);
  line-height: 1.45;
  color: rgba(255, 255, 255, 0.92);
  text-shadow: 0 2px 12px rgba(0, 0, 0, 0.35);
}

html[lang="en"] .about-hero__subtitle {
  display: none;
}

.about-hero__tagline {
  margin: 0;
  font-size: clamp(0.8125rem, calc(100vw / var(--design-width) * 17), 0.9375rem);
  line-height: 1.55;
  color: rgba(255, 255, 255, 0.88);
  text-shadow: 0 2px 12px rgba(0, 0, 0, 0.35);
}

.site-footer {
  padding-block: 1.5rem;
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  text-align: center;
  border-top: 1px solid rgba(26, 29, 36, 0.06);
}