@font-face {
  font-family: "Manrope Variable";
  src: url("./fonts/Manrope-Variable.woff2") format("woff2");
  font-style: normal;
  font-weight: 200 800;
  font-display: swap;
}

.about-hero {
  height: 500px;
  background-image:
    linear-gradient(90deg, rgba(14, 17, 23, 0.6) 0%, rgba(20, 35, 68, 0.6) 100%),
    url("../img/city.png");
  background-size: cover;
  background-position: center;
  overflow: hidden;
}

.about-hero-inner {
  width: 1440px;
  height: 100%;
  margin: 0 auto;
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 80px 0;
  box-sizing: border-box;
}

.about-hero-slogan {
  position: absolute;
  left: -57px;
  top: 404px;
  width: 298px;
  height: 18px;
  z-index: 1;
}

.about-hero-slogan img {
  width: 100%;
  height: 100%;
  display: block;
}

.about-hero-copy {
  display: flex;
  flex-direction: column;
  gap: 24px;
  color: #ffffff;
  position: relative;
  z-index: 2;
}

.about-hero-label,
.about-hero-title,
.about-gradient-title,
.about-intro-subtitle,
.about-intro-text,
.about-metric-value,
.about-metric-label,
.about-certifications-text,
.about-certifications-count,
.about-cert-card-title,
.about-vision-title,
.about-vision-text,
.about-team-subtitle,
.about-team-name,
.about-team-role,
.about-partners-title,
.about-partners-subtitle,
.about-milestones-subtitle,
.about-milestones-text,
.about-milestone-year,
.about-milestone-item {
  margin: 0;
  font-family: "Manrope Variable", "Manrope", Arial, sans-serif;
  font-synthesis: none;
}

.about-hero-label {
  line-height: 1.7;
  font-weight: 400;
  font-variation-settings: "wght" 400;
}

.about-hero-title {
  line-height: 1.1;
  font-weight: 300;
  font-variation-settings: "wght" 300;
}

.about-intro-section,
.about-team-section,
.about-milestones-section {
  padding: 160px 0;
  background: #ffffff;
}

.about-intro-inner,
.about-metrics-inner,
.about-certifications-inner,
.about-vision-inner,
.about-team-inner,
.about-milestones-inner {
  width: 1440px;
  margin: 0 auto;
}

.about-intro-inner {
  display: flex;
  align-items: center;
  gap: 80px;
}

.about-intro-media,
.about-intro-copy {
  flex: 1 1 0;
}

.about-intro-media {
  height: 453px;
  overflow: hidden;
  border-radius: 4px;
}

.about-intro-media img {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: cover;
}

.about-intro-copy {
  display: flex;
  flex-direction: column;
  gap: 40px;
}

.about-gradient-title {
  line-height: 1.25;
  font-weight: 400;
  font-variation-settings: "wght" 400;
  background: linear-gradient(90deg, #1b8c6c 0%, #042959 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.about-intro-subtitle,
.about-milestones-subtitle {
  line-height: 1.3;
  color: #042959;
  font-weight: 400;
  font-variation-settings: "wght" 400;
}

.about-intro-text {
  line-height: 1.6;
  color: #042959;
  font-weight: 500;
  font-variation-settings: "wght" 500;
}

.about-metrics-section {
  padding: 20px 0;
  background: linear-gradient(90deg, #1b8c6c 0%, #042959 100%);
}

.about-metrics-inner {
  min-height: 194px;
  display: grid;
  grid-template-columns: 382px 343px 259px 292px;
  align-items: center;
  justify-content: space-between;
}

.about-metric-card {
  min-height: 152px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 8px;
  box-sizing: border-box;
  color: #ffffff;
}

.about-metric-card:nth-child(1) {
  padding-right: 32px;
}

.about-metric-card:nth-child(2),
.about-metric-card:nth-child(3) {
  padding: 0 32px;
}

.about-metric-card:nth-child(4) {
  padding-left: 32px;
}

.about-metric-value {
  line-height: 1.15;
  font-weight: 600;
  font-variation-settings: "wght" 600;
}

.about-metric-label {
  line-height: 1.6;
  font-weight: 500;
  font-variation-settings: "wght" 500;
}

.about-certifications-section {
  padding: 160px 0;
  background: #f0f2f5;
  overflow: hidden;
}

.about-certifications-inner {
  display: flex;
  align-items: flex-start;
  gap: 80px;
  width: 1680px;
  margin-left: calc((100% - 1440px) / 2);
  margin-right: 0;
}

.about-certifications-copy {
  width: 420px;
  flex: 0 0 420px;
  min-height: 414px;
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  gap: 20px;
  padding: 20px 0;
  box-sizing: border-box;
  position: relative;
  z-index: 2;
  background: #f0f2f5;
}

.about-certifications-text {
  margin-top: 0;
  line-height: 1.6;
  color: #5a657c;
  font-weight: 500;
  font-variation-settings: "wght" 500;
}

.about-certifications-nav {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-top: auto;
  padding: 10px;
}

.about-certifications-arrow {
  width: 32px;
  height: 32px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: none;
  background: transparent;
  padding: 0;
  cursor: pointer;
}

.about-certifications-arrow img {
  width: 22px;
  height: 22px;
  display: block;
  transition: transform 0.28s ease, filter 0.28s ease;
}

.about-certifications-arrow.is-prev:hover img {
  transform: translateX(-4px);
  filter: brightness(0) saturate(100%) invert(44%) sepia(74%) saturate(520%) hue-rotate(124deg) brightness(91%) contrast(90%);
}

.about-certifications-arrow.is-next:hover img {
  transform: translateX(4px);
  filter: brightness(0) saturate(100%) invert(44%) sepia(74%) saturate(520%) hue-rotate(124deg) brightness(91%) contrast(90%);
}

.about-certifications-count {
  line-height: 1.6;
  color: #042959;
  font-weight: 500;
  font-variation-settings: "wght" 500;
}

.about-certifications-track-wrap {
  width: 1180px;
  flex: 0 0 1180px;
  overflow: hidden;
  position: relative;
  z-index: 1;
}

.about-certifications-track {
  width: 100%;
  flex: none;
  display: flex;
  gap: 80px;
  overflow-x: auto;
  overflow-y: hidden;
  cursor: grab;
  -ms-overflow-style: none;
  scrollbar-width: none;
  will-change: transform;
  transition: transform 0.52s cubic-bezier(0.22, 1, 0.36, 1);
  position: relative;
}

.about-certifications-track::-webkit-scrollbar {
  display: none;
}

.about-certifications-track.is-dragging {
  cursor: grabbing;
  transition: none;
}

.about-certifications-track.is-dragging,
.about-certifications-track.is-dragging * {
  user-select: none;
}

.about-cert-card {
  width: 240px;
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.about-cert-card-media {
  width: 240px;
  height: 340px;
  border-radius: 4px;
  overflow: hidden;
}

.about-cert-card-media img {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: cover;
  user-select: none;
  -webkit-user-drag: none;
}

.about-cert-card-title {
  text-align: center;
  line-height: 1.6;
  color: #042959;
  font-weight: 500;
  font-variation-settings: "wght" 500;
}

.about-vision-section {
  padding: 0;
  background-image: url("https://www.figma.com/api/mcp/asset/1ef2de08-de3f-441e-afcd-8137cdd56c27");
  background-size: cover;
  background-position: center;
  overflow: hidden;
}

.about-vision-inner {
  min-height: 332px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 20px;
  text-align: center;
  color: #ffffff;
}

.about-vision-title {
  line-height: 1.1;
  font-weight: 300;
  font-variation-settings: "wght" 300;
}

.about-vision-text {
  line-height: 1.7;
  font-weight: 400;
  font-variation-settings: "wght" 400;
}

.about-team-inner {
  display: flex;
  flex-direction: column;
  gap: 80px;
}

.about-team-head {
  padding: 20px 0;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.about-team-subtitle {
  line-height: 1.6;
  color: #5a657c;
  font-weight: 500;
  font-variation-settings: "wght" 500;
}

.about-team-grid {
  display: flex;
  flex-direction: column;
  gap: 80px;
}

/* 每行4张卡片，卡片间距80px，与Figma一致 */
.about-team-row {
  display: flex;
  align-items: flex-start;
  gap: 80px;
}

.about-team-card {
  flex: 0 0 300px;
  width: 300px;
  border-radius: 4px;
  overflow: hidden;
  background: transparent;
}

.about-team-photo-wrap {
  width: 100%;
  aspect-ratio: 300 / 400;
  overflow: hidden;
  border-radius: 4px;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  background: linear-gradient(180deg, #d0d3d9 0%, #f0f2f5 100%);
}

.about-team-photo {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: cover;
  object-position: center top;
  transition: transform 0.35s ease;
}

.about-team-card-bottom {
  padding: 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.about-team-card-copy {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.about-team-name {
  line-height: 1.7;
  color: #042959;
  font-weight: 400;
  font-variation-settings: "wght" 400;
}

.about-team-role {
  line-height: 1.7;
  color: #5a657c;
  font-weight: 400;
  font-variation-settings: "wght" 400;
}

.about-team-plus {
  width: 40px;
  height: 40px;
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  border: none;
  background: transparent;
  cursor: pointer;
}

.about-team-plus-icon {
  width: 100%;
  height: 100%;
  display: block;
  border-radius: 50%;
  border: 1px solid #d0d3d9;
  position: relative;
  transition: transform 0.3s ease, border-color 0.3s ease, background-color 0.3s ease;
}

.about-team-plus-icon::before,
.about-team-plus-icon::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  background: #d0d3d9;
  transform: translate(-50%, -50%);
  transition: background-color 0.3s ease;
}

.about-team-plus-icon::before {
  width: 16px;
  height: 1px;
}

.about-team-plus-icon::after {
  width: 1px;
  height: 16px;
}

/* 鼠标悬停在照片区域时，触发与 is-active 完全一致的视觉效果 */
.about-team-card:has(.about-team-photo-wrap:hover) .about-team-photo-wrap {
  background: radial-gradient(circle at center, #d0d3d9 0%, #959cab 50%, #788193 75%, #5a657c 100%);
}

.about-team-card:has(.about-team-photo-wrap:hover) .about-team-photo {
  transform: scale(1.03);
}

.about-team-card:has(.about-team-photo-wrap:hover) .about-team-plus-icon {
  border-color: #23d972;
  background: rgba(35, 217, 114, 0.08);
}

.about-team-card:has(.about-team-photo-wrap:hover) .about-team-plus-icon::before,
.about-team-card:has(.about-team-photo-wrap:hover) .about-team-plus-icon::after {
  background: #23d972;
}

/* 鼠标悬停在加号按钮时保持原有效果 */
.about-team-card:hover .about-team-photo {
  transform: scale(1.04);
}

.about-team-card:hover .about-team-plus-icon {
  border-color: #23d972;
}

.about-team-card:hover .about-team-plus-icon::before,
.about-team-card:hover .about-team-plus-icon::after {
  background: #23d972;
}

.about-team-card.is-active .about-team-plus-icon {
  border-color: #23d972;
  background: rgba(35, 217, 114, 0.08);
}

.about-team-card.is-active .about-team-plus-icon::before,
.about-team-card.is-active .about-team-plus-icon::after {
  background: #23d972;
}

.about-team-card.is-active .about-team-plus-icon::after {
  opacity: 0;
}

.about-team-card.is-active .about-team-photo-wrap {
  background: radial-gradient(circle at center, #d0d3d9 0%, #959cab 50%, #788193 75%, #5a657c 100%);
}

.about-team-card.is-active .about-team-photo {
  transform: scale(1.03);
}

.about-team-detail {
  position: fixed;
  inset: 0;
  box-sizing: border-box;
  display: flex;
  align-items: flex-end;
  justify-content: flex-end;
  padding: 40px;
  gap: 10px;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 0.42s ease, visibility 0.42s ease;
  z-index: 1200;
}

.about-team-detail.is-visible {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}

.about-team-detail-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(4, 16, 34, 0.82);
  opacity: 0;
  transition: opacity 0.42s ease;
}

.about-team-detail.is-visible .about-team-detail-backdrop {
  opacity: 1;
}

.about-team-detail-toolbar {
  width: 56px;
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  position: relative;
  z-index: 1;
}

.about-team-detail-close {
  width: 56px;
  height: 56px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  border: none;
  background: #080e1b;
  border-radius: 2px;
  cursor: pointer;
  flex-shrink: 0;
}

.about-team-detail-close-icon,
.about-team-detail-switch-icon {
  position: relative;
  width: 24px;
  height: 24px;
  display: block;
}

.about-team-detail-close-icon::before,
.about-team-detail-close-icon::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  width: 24px;
  height: 2px;
  background: #ffffff;
  transform-origin: center;
}

.about-team-detail-close-icon::before {
  transform: translate(-50%, -50%) rotate(45deg);
}

.about-team-detail-close-icon::after {
  transform: translate(-50%, -50%) rotate(-45deg);
}

.about-team-detail-switches {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.about-team-detail-switch {
  width: 56px;
  height: 56px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  border: none;
  border-radius: 2px;
  background: #080e1b;
  cursor: pointer;
  transition: background 0.3s ease;
}

.about-team-detail-switch:hover {
  background: linear-gradient(90deg, #23d972 0%, #0fa3a3 100%);
}

.about-team-detail-switch-icon::before,
.about-team-detail-switch-icon::after {
  content: "";
  position: absolute;
  top: 50%;
  background: #ffffff;
}

.about-team-detail-switch-icon::before {
  left: 2px;
  width: 18px;
  height: 2px;
  transform: translateY(-50%);
}

.about-team-detail-switch-icon::after {
  right: 2px;
  width: 8px;
  height: 8px;
  border-top: 2px solid #ffffff;
  border-right: 2px solid #ffffff;
  background: transparent;
  transform: translateY(-50%) rotate(45deg);
}

.about-team-detail-switch.is-prev .about-team-detail-switch-icon {
  transform: rotate(180deg);
}

.about-team-detail-card {
  width: 600px;
  height: 800px;
  padding: 40px;
  box-sizing: border-box;
  background: #ffffff;
  border-radius: 4px;
  box-shadow: 0 24px 60px rgba(4, 41, 89, 0.18);
  display: flex;
  flex-direction: column;
  gap: 20px;
  position: relative;
  z-index: 1;
  transform: translateX(140px);
  transition: transform 0.68s cubic-bezier(0.22, 1, 0.36, 1);
}

.about-team-detail.is-visible .about-team-detail-card,
.about-team-detail.is-visible .about-team-detail-toolbar {
  transform: translateX(0);
}

.about-team-detail-toolbar {
  transform: translateX(140px);
  transition: transform 0.68s cubic-bezier(0.22, 1, 0.36, 1);
}

.about-team-detail-media {
  width: 100%;
  height: 400px;
  border-radius: 4px;
  overflow: hidden;
  background: linear-gradient(180deg, #d0d3d9 0%, #f0f2f5 100%);
}

.about-team-detail-image {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: cover;
  object-position: center top;
}

.about-team-detail-content {
  flex: 1 1 auto;
  display: flex;
  flex-direction: column;
  gap: 40px;
  overflow-y: auto;
}

.about-team-detail-head {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.about-team-detail-name,
.about-team-detail-role,
.about-team-detail-text {
  margin: 0;
  font-family: "Manrope Variable", "Manrope", Arial, sans-serif;
  color: #042959;
}

.about-team-detail-name {
  line-height: 1.15;
}

.about-team-detail-role {
  line-height: 1.7;
  color: #5a657c;
}

.about-team-detail-body {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.about-team-detail-text {
  line-height: 1.6;
  font-weight: 500;
  font-variation-settings: "wght" 500;
}

.about-partners-section {
  position: relative;
  padding: 80px 0 120px;
  background-image: url("https://www.figma.com/api/mcp/asset/a14e0b30-7a4e-46d3-a32b-bd6d51035d97");
  background-size: cover;
  background-position: center;
  overflow: hidden;
}

.about-partners-overlay {
  position: absolute;
  inset: 0;
  /* 绿色渐变遮罩叠加在背景图上方 */
  background-image:
    linear-gradient(90deg, rgba(35, 217, 114, 0.8) 0%, rgba(15, 163, 163, 0.8) 100%),
    url("../img/partners.png");
  background-size: cover;
  background-position: center;
}

.about-partners-inner {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 80px;
}

.about-partners-head {
  width: 457px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
  text-align: center;
  color: #ffffff;
}

.about-partners-title,
.about-partners-subtitle {
  margin: 0;
  font-family: "Manrope Variable", "Manrope", Arial, sans-serif;
  color: #ffffff;
}

.about-partners-title {
  line-height: 1.25;
  font-weight: 400;
  font-variation-settings: "wght" 400;
}

.about-partners-subtitle {
  line-height: 1.6;
  font-weight: 500;
  font-variation-settings: "wght" 500;
}

.about-partners-marquee {
  width: 100%;
  overflow-x: auto;
  overflow-y: hidden;
  /* 隐藏滚动条 */
  -ms-overflow-style: none;
  scrollbar-width: none;
  cursor: grab;
  user-select: none;
  will-change: transform;
  transition: transform 0.52s cubic-bezier(0.22, 1, 0.36, 1);
}

.about-partners-marquee::-webkit-scrollbar {
  display: none;
}

.about-partners-marquee.is-dragging {
  cursor: grabbing;
  transition: none;
}

.about-partners-track {
  display: flex;
  align-items: center;
  gap: 120px;
  width: max-content;
  padding: 0 120px;
  /* 取消自动轮播动画 */
}

.about-partner-logo {
  width: 260px;
  height: 260px;
  flex-shrink: 0;
  position: relative;
  /* SVG本身已内嵌260×260尺寸、内边距和背景，容器不需要padding */
}

.about-partner-logo-default {
  /* 默认态SVG：透明背景+白色logo，占满260×260 */
  width: 260px;
  height: 260px;
  display: block;
  position: relative;
  z-index: 1;
  opacity: 1;
  transition: opacity 0.35s ease;
}

.about-partner-logo-hover {
  /* hover态SVG：白色背景+彩色logo，绝对覆盖，初始透明 */
  position: absolute;
  inset: 0;
  width: 260px;
  height: 260px;
  display: block;
  z-index: 2;
  opacity: 0;
  transition: opacity 0.35s ease;
}

.about-partner-logo:hover .about-partner-logo-default {
  opacity: 0;
}

.about-partner-logo:hover .about-partner-logo-hover {
  opacity: 1;
}


.about-milestones-inner {
  display: flex;
  align-items: flex-start;
  gap: 120px;
  min-height: 600px;
}

.about-milestones-copy {
  width: 521px;
  padding: 20px 0;
  display: flex;
  flex-direction: column;
  gap: 80px;
}

.about-milestones-copy-block {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.about-milestones-text {
  line-height: 1.7;
  color: #5a657c;
  font-weight: 400;
  font-variation-settings: "wght" 400;
}

.about-milestones-timeline-wrap {
  position: relative;
  width: 799px;
  height: 600px;
  flex-shrink: 0;
  overflow: hidden;
}

/* 底部渐隐遮罩，提示还有内容可向下滚动 */
.about-milestones-timeline-wrap::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 120px;
  background: linear-gradient(to top, #ffffff 20%, transparent 100%);
  pointer-events: none;
  z-index: 3;
  transition: opacity 0.3s ease;
}

/* 滚动到底部时隐藏遮罩 */
.about-milestones-timeline-wrap.is-scrolled-bottom::after {
  opacity: 0;
}

.about-milestones-timeline {
  width: 100%;
  height: 100%;
  position: relative;
  padding: 10px 0;
  box-sizing: border-box;
  /* 内部可上下滚动，隐藏滚动条 */
  overflow-y: auto;
  overflow-x: hidden;
  -ms-overflow-style: none;
  scrollbar-width: none;
}

.about-milestones-timeline::-webkit-scrollbar {
  display: none;
}

/* 底部留白，让最后一项滚动后完整显示 */
.about-milestones-tail {
  height: 60px;
}

.about-milestones-line {
  /* 放在 wrap 层，不随内部滚动，始终覆盖整个600px可见区域 */
  position: absolute;
  left: 50%;
  top: 0;
  width: 2px;
  height: 100%;
  background: #e9ebee;
  transform: translateX(-50%);
  pointer-events: none;
  z-index: 1;
}

/* 顶部1/2 固定绿色渐变，不随滚动变化 */
.about-milestones-line::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 50%;
  background: linear-gradient(to bottom, #1ca666 0%, #1b8c6c 100%);
}

.about-milestone {
  position: relative;
  width: 100%;
  min-height: 220px;
}

.about-milestone + .about-milestone {
  margin-top: 30px;
}

.about-milestone-dot {
  position: absolute;
  left: 50%;
  top: 28px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: linear-gradient(90deg, #1ca666 0%, #042959 100%);
  transform: translateX(-50%);
  z-index: 2;
}

.about-milestone-body {
  width: 359px;
  display: flex;
  flex-direction: column;
  gap: 40px;
}

.about-milestone--right .about-milestone-body {
  margin-left: calc(50% + 40px);
  text-align: left;
}

.about-milestone--left .about-milestone-body {
  margin-right: calc(50% + 40px);
  margin-left: auto;
  text-align: right;
}

.about-milestone-year {
  line-height: 1.25;
  font-weight: 400;
  font-variation-settings: "wght" 400;
  background: linear-gradient(90deg, #1b8c6c 0%, #042959 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.about-milestone--left .about-milestone-year {
  background: linear-gradient(90deg, #042959 0%, #1b8c6c 100%);
  -webkit-background-clip: text;
  background-clip: text;
}

.about-milestone-item {
  line-height: 1.6;
  color: #042959;
  font-weight: 500;
  font-variation-settings: "wght" 500;
}

@media screen and (max-width: 768px) {
  .about-hero {
    height: auto;
    min-height: 420px;
  }

  .about-hero-inner,
  .about-intro-inner,
  .about-metrics-inner,
  .about-certifications-inner,
  .about-vision-inner,
  .about-team-inner,
  .about-milestones-inner {
    width: calc(100% - 32px);
    max-width: calc(100% - 32px);
  }

  .about-hero-inner {
    padding: 120px 0 32px;
  }

  .about-hero-slogan {
    display: none;
  }

  .about-intro-section,
  .about-team-section,
  .about-milestones-section,
  .about-certifications-section {
    padding: 64px 0;
  }

  .about-intro-inner,
  .about-certifications-inner,
  .about-milestones-inner {
    flex-direction: column;
    gap: 32px;
  }

  .about-certifications-inner {
    margin-left: auto;
    margin-right: auto;
  }

  .about-intro-media,
  .about-intro-copy,
  .about-certifications-copy,
  .about-milestones-copy,
  .about-milestones-timeline-wrap,
  .about-milestones-timeline {
    width: 100%;
  }

  /* 手机端时间线自然高度，不限制固定高度 */
  .about-milestones-timeline-wrap {
    height: auto;
  }

  .about-milestones-timeline-wrap::after {
    display: none;
  }

  .about-milestones-timeline {
    height: auto;
    overflow-y: visible;
    overflow-x: visible;
  }

  .about-intro-media {
    height: auto;
    aspect-ratio: 680 / 453;
  }

  .about-metrics-inner {
    min-height: auto;
    grid-template-columns: 1fr 1fr;
    gap: 24px 16px;
    padding: 24px 0;
  }

  .about-metric-card,
  .about-metric-card:nth-child(1),
  .about-metric-card:nth-child(2),
  .about-metric-card:nth-child(3),
  .about-metric-card:nth-child(4) {
    padding: 0;
  }

  .about-certifications-track-wrap {
    width: 100%;
    flex: 1 1 auto;
    overflow: hidden;
  }

  .about-certifications-nav {
    display: none;
  }

  .about-certifications-copy {
    flex: none;
    min-height: auto;
  }

  .about-certifications-track {
    width: 100%;
    flex: 1 1 auto;
    flex-direction: row;
    align-items: flex-start;
    gap: 24px;
    overflow-x: auto;
    overflow-y: hidden;
    padding-left: calc((100% - 320px) / 2);
    padding-right: calc((100% - 320px) / 2);
    box-sizing: border-box;
    cursor: grab;
  }

  .about-cert-card {
    width: 320px;
    max-width: none;
  }

  .about-cert-card-media {
    width: 100%;
    height: auto;
    aspect-ratio: 240 / 340;
  }

  .about-vision-inner {
    min-height: 280px;
    padding: 48px 0;
  }

  .about-vision-text br,
  .about-hero-title br {
    display: none;
  }

  .about-team-grid {
    gap: 24px;
  }

  .about-team-row {
    flex-direction: column;
    gap: 24px;
  }

  .about-team-card {
    flex: 0 0 auto;
    width: 100%;
  }

  .about-team-section.section-scroll-fade,
  .about-team-section.section-scroll-fade.is-visible {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .about-team-detail {
    align-items: flex-end;
    justify-content: flex-end;
    padding: 16px;
    gap: 8px;
    flex-direction: column;
  }

  .about-team-detail-toolbar {
    width: 100%;
    height: auto;
    flex-direction: row;
    justify-content: space-between;
  }

  .about-team-detail-switches {
    flex-direction: row;
  }

  .about-team-detail-card {
    width: 100%;
    height: auto;
    max-height: calc(100vh - 120px);
    padding: 24px;
  }

  .about-team-detail-media {
    height: auto;
    aspect-ratio: 520 / 400;
  }

  .about-partners-section {
    padding: 64px 0 80px;
  }

  .about-partners-head {
    width: calc(100% - 32px);
  }

  .about-partners-track {
    gap: 40px;
    padding: 0 24px;
  }

  .about-partner-logo {
    width: 140px;
    height: 140px;
  }

  .about-partner-logo-default,
  .about-partner-logo-hover {
    width: 100%;
    height: 100%;
    object-fit: contain;
  }

  .about-milestones-line {
    left: 12px;
    transform: none;
  }

  .about-milestone-dot {
    left: 12px;
    transform: translateX(-50%);
  }

  .about-milestone-body,
  .about-milestone--left .about-milestone-body,
  .about-milestone--right .about-milestone-body {
    width: calc(100% - 40px);
    margin-left: 40px;
    margin-right: 0;
    text-align: left;
  }

  .about-milestone + .about-milestone {
    margin-top: 32px;
  }
}