.page-about {
  overflow-x: hidden;
  background-color: var(--bg-primary);
  color: var(--text-primary);
}

/* ---- 面包屑 ---- */
.page-about .breadcrumb {
  max-width: var(--container);
  margin: 0 auto;
  padding: 28px 20px 0;
}

.page-about .breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .breadcrumb__item {
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.5;
  color: var(--text-secondary);
}

.page-about .breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  margin-right: 8px;
  color: var(--line);
}

.page-about .breadcrumb__link {
  color: var(--text-secondary);
  text-decoration: none;
  transition: color 0.2s ease;
}

.page-about .breadcrumb__link:hover {
  color: var(--brand);
}

/* ---- 首屏品牌宣言 ---- */
.page-about .about-hero {
  position: relative;
  padding: 48px 0 64px;
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(rgba(255, 255, 255, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.04) 1px, transparent 1px);
  background-size: 48px 48px;
  -webkit-mask-image: linear-gradient(90deg, #000 0%, #000 55%, transparent 100%);
  mask-image: linear-gradient(90deg, #000 0%, #000 55%, transparent 100%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 58%;
  height: 100%;
  background: linear-gradient(135deg, transparent 0%, rgba(0, 255, 170, 0.07) 45%, rgba(0, 184, 255, 0.09) 100%);
  clip-path: polygon(18% 0, 100% 0, 100% 100%, 0 100%);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 36px;
}

.page-about .about-hero__content {
  display: flex;
  flex-direction: column;
  gap: 20px;
  min-width: 0;
}

.page-about .about-hero__title {
  font-family: var(--font-heading);
  font-size: clamp(2.4rem, 7vw, 4rem);
  font-weight: 800;
  line-height: 1.08;
  letter-spacing: -0.02em;
  margin: 0;
}

.page-about .about-hero__lead {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.75;
  color: var(--text-secondary);
  max-width: 58ch;
  margin: 0;
}

.page-about .about-hero__badges {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 4px 0 0;
  padding: 0;
}

.page-about .about-hero__badges li {
  margin: 0;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 8px;
}

.page-about .about-hero__figure {
  position: relative;
  margin: 0;
  background: var(--bg-secondary);
  border: 1px solid var(--line);
  clip-path: polygon(3% 0, 100% 0, 97% 100%, 0 100%);
}

.page-about .about-hero__figure::after {
  content: "";
  position: absolute;
  inset: auto 14px 14px auto;
  width: 44px;
  height: 44px;
  border-right: 2px solid var(--brand);
  border-bottom: 2px solid var(--brand);
  pointer-events: none;
}

.page-about .about-hero__figure img,
.page-about .about-milestone__figure img,
.page-about .about-team__figure img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
}

.page-about .about-hero__caption {
  margin: 12px 0 0;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--text-secondary);
}

/* ---- 品牌定位 ---- */
.page-about .about-position {
  position: relative;
  padding: 64px 0;
}

.page-about .about-position::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 1px;
  background: linear-gradient(90deg, var(--brand) 0%, var(--line) 30%, transparent 100%);
}

.page-about .about-position__inner {
  display: grid;
  gap: 36px;
}

.page-about .about-position__intro {
  min-width: 0;
}

.page-about .about-position__slogan {
  margin: 20px 0 0;
  font-family: var(--font-heading);
  font-size: 1.15rem;
  line-height: 1.6;
  color: var(--text-primary);
}

.page-about .about-position__body {
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.page-about .about-position__body > p {
  margin: 0;
  font-size: 0.97rem;
  line-height: 1.75;
  color: var(--text-secondary);
}

.page-about .about-position__principles {
  list-style: none;
  margin: 8px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-position__principle {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  padding: 18px 16px;
  background: var(--bg-secondary);
  border: 1px solid var(--line);
  transition: border-color 0.2s ease, background 0.2s ease;
}

.page-about .about-position__principle:hover {
  border-color: var(--brand);
  background: var(--surface);
}

.page-about .about-position__principle-index {
  flex: 0 0 auto;
  font-size: 14px;
  color: var(--brand);
  line-height: 1.4;
}

.page-about .about-position__principle-body {
  min-width: 0;
}

.page-about .about-position__principle-body h3 {
  margin: 0 0 6px;
  font-family: var(--font-heading);
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--text-primary);
}

.page-about .about-position__principle-body p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.65;
  color: var(--text-secondary);
}

/* ---- 发展里程碑 ---- */
.page-about .about-milestone {
  position: relative;
  padding: 64px 0;
  background: var(--bg-primary);
}

.page-about .about-milestone__heading {
  margin-bottom: 36px;
}

.page-about .about-milestone__layout {
  display: grid;
  gap: 40px;
}

.page-about .about-milestone__aside {
  min-width: 0;
}

.page-about .about-milestone__figure {
  margin: 0;
  background: var(--bg-secondary);
  border: 1px solid var(--line);
}

.page-about .about-milestone__aside > p {
  margin: 14px 0 0;
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--text-secondary);
  border-left: 2px solid var(--accent);
  padding-left: 14px;
}

.page-about .about-timeline {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 10px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: linear-gradient(to bottom, var(--brand) 0%, var(--line) 35%, var(--line) 100%);
}

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 36px 42px;
}

.page-about .about-timeline__item--last {
  padding-bottom: 0;
}

.page-about .about-timeline__marker {
  position: absolute;
  left: 4px;
  top: 8px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--brand);
  box-shadow: 0 0 0 4px rgba(0, 255, 170, 0.15), 0 0 14px rgba(0, 255, 170, 0.45);
}

.page-about .about-timeline__item--first .about-timeline__marker {
  background: var(--highlight);
  box-shadow: 0 0 0 4px rgba(255, 138, 0, 0.16), 0 0 14px rgba(255, 138, 0, 0.45);
}

.page-about .about-timeline__label {
  display: inline-block;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--brand);
  margin-bottom: 6px;
  padding: 2px 8px;
  background: rgba(0, 255, 170, 0.08);
  border-left: 2px solid var(--brand);
}

.page-about .about-timeline__body {
  background: var(--bg-secondary);
  border: 1px solid var(--line);
  padding: 16px 18px;
  transition: border-color 0.2s ease;
}

.page-about .about-timeline__body:hover {
  border-color: rgba(0, 255, 170, 0.5);
}

.page-about .about-timeline__body h3 {
  margin: 0 0 6px;
  font-family: var(--font-heading);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
}

.page-about .about-timeline__body p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.65;
  color: var(--text-secondary);
}

/* ---- 资质与认证 ---- */
.page-about .about-qualification {
  padding: 64px 0;
  background: var(--bg-secondary);
}

.page-about .about-qualification__heading {
  margin-bottom: 36px;
}

.page-about .about-qualification__grid {
  display: grid;
  gap: 14px;
}

.page-about .about-qualification__card {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--line);
  padding: 24px 20px;
  overflow: hidden;
  transition: border-color 0.2s ease;
}

.page-about .about-qualification__card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  transform: scaleY(0);
  transform-origin: top;
  transition: transform 0.25s ease;
}

.page-about .about-qualification__card:nth-child(1)::before,
.page-about .about-qualification__card:nth-child(2)::before {
  background: var(--brand);
}

.page-about .about-qualification__card:nth-child(3)::before,
.page-about .about-qualification__card:nth-child(4)::before {
  background: var(--accent);
}

.page-about .about-qualification__card:hover::before {
  transform: scaleY(1);
}

.page-about .about-qualification__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 4px 10px;
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--brand);
  background: rgba(0, 255, 170, 0.08);
  border: 1px solid rgba(0, 255, 170, 0.3);
}

.page-about .about-qualification__card:nth-child(3) .about-qualification__icon,
.page-about .about-qualification__card:nth-child(4) .about-qualification__icon {
  color: var(--accent);
  background: rgba(0, 184, 255, 0.08);
  border-color: rgba(0, 184, 255, 0.3);
}

.page-about .about-qualification__card h3 {
  margin: 18px 0 8px;
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
}

.page-about .about-qualification__card p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.7;
  color: var(--text-secondary);
}

.page-about .about-qualification__code {
  margin-top: 12px !important;
  padding-top: 10px;
  border-top: 1px dashed var(--line);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--brand);
}

/* ---- 服务能力 ---- */
.page-about .about-capability {
  position: relative;
  padding: 64px 0;
  background:
    linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
  background-size: 32px 32px;
}

.page-about .about-capability::after {
  content: "";
  position: absolute;
  bottom: 0;
  right: 0;
  width: 46%;
  height: 240px;
  background: linear-gradient(180deg, transparent, rgba(0, 255, 170, 0.05));
  clip-path: polygon(10% 0, 100% 0, 100% 100%, 0 100%);
  pointer-events: none;
}

.page-about .about-capability__heading {
  margin-bottom: 32px;
}

.page-about .about-capability__desc {
  margin: 16px 0 0;
  color: var(--text-secondary);
  font-size: 0.94rem;
  line-height: 1.7;
  max-width: 640px;
}

.page-about .about-capability__stats {
  display: grid;
  gap: 12px;
  margin: 0;
}

.page-about .about-capability__stat {
  position: relative;
  min-width: 0;
  background: var(--bg-secondary);
  border: 1px solid var(--line);
  padding: 22px 18px;
  transition: border-color 0.2s ease;
}

.page-about .about-capability__stat:hover {
  border-color: rgba(0, 255, 170, 0.45);
}

.page-about .about-capability__stat .data-label {
  margin: 0;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--text-secondary);
}

.page-about .about-capability__value {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px;
  margin: 8px 0 0;
}

.page-about .about-capability__value .data-value {
  font-family: var(--font-mono);
  font-size: 2rem;
  line-height: 1.1;
  letter-spacing: -0.02em;
}

.page-about .about-capability__unit {
  font-size: 12px;
  color: var(--text-secondary);
  white-space: nowrap;
}

@keyframes about-capability-glow {
  0%, 100% {
    text-shadow: 0 0 6px rgba(0, 255, 170, 0.16);
  }
  50% {
    text-shadow: 0 0 18px rgba(0, 255, 170, 0.5);
  }
}

.page-about .about-capability__stat:hover .data-value {
  animation: about-capability-glow 1.1s ease-in-out infinite;
}

/* ---- 合作生态 ---- */
.page-about .about-ecosystem {
  padding: 64px 0;
  background: var(--bg-secondary);
}

.page-about .about-ecosystem__lead {
  max-width: 680px;
  margin: 18px 0 0;
  font-size: 0.98rem;
  line-height: 1.8;
  color: var(--text-secondary);
}

.page-about .about-ecosystem__map {
  position: relative;
  margin-top: 32px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.page-about .about-ecosystem__lines {
  display: none;
}

.page-about .about-ecosystem__center {
  grid-column: 1 / -1;
  justify-self: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: 120px;
  height: 120px;
  background: var(--brand);
  margin-bottom: 8px;
  position: relative;
  z-index: 2;
}

.page-about .about-ecosystem__center::after {
  content: "";
  position: absolute;
  inset: -6px;
  border: 1px dashed var(--brand);
  pointer-events: none;
}

.page-about .about-ecosystem__center-text {
  font-family: var(--font-heading);
  font-size: 1.7rem;
  font-weight: 800;
  line-height: 1;
  color: #07120d;
}

.page-about .about-ecosystem__center-caption {
  margin-top: 4px;
  font-size: 12px;
  color: rgba(7, 18, 13, 0.72);
}

.page-about .about-ecosystem__node {
  position: relative;
  min-width: 0;
  background: var(--surface);
  border: 1px solid var(--line);
  padding: 16px 12px;
  text-align: center;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
  z-index: 1;
}

.page-about .about-ecosystem__node:hover {
  border-color: var(--brand);
  box-shadow: 0 0 22px rgba(0, 255, 170, 0.12);
}

.page-about .about-ecosystem__node--domestic:hover {
  border-color: var(--accent);
  box-shadow: 0 0 22px rgba(0, 184, 255, 0.12);
}

.page-about .about-ecosystem__node-name {
  display: block;
  font-family: var(--font-heading);
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-primary);
}

.page-about .about-ecosystem__node-tip {
  display: block;
  position: absolute;
  bottom: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%);
  width: max-content;
  max-width: 170px;
  padding: 6px 10px;
  background: var(--bg-primary);
  border: 1px solid var(--line);
  font-size: 12px;
  line-height: 1.45;
  color: var(--text-secondary);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease;
  z-index: 5;
}

.page-about .about-ecosystem__node:hover .about-ecosystem__node-tip {
  opacity: 1;
}

/* ---- 团队 ---- */
.page-about .about-team {
  padding: 64px 0;
  background: var(--bg-primary);
}

.page-about .about-team__inner {
  display: grid;
  gap: 36px;
}

.page-about .about-team__figure {
  margin: 0;
  position: relative;
  background: var(--bg-secondary);
  border: 1px solid var(--line);
  overflow: hidden;
}

.page-about .about-team__figure::after {
  content: "";
  position: absolute;
  top: 12px;
  left: 12px;
  width: 46px;
  height: 46px;
  border-top: 2px solid var(--accent);
  border-left: 2px solid var(--accent);
  pointer-events: none;
}

.page-about .about-team__content {
  min-width: 0;
}

.page-about .about-team__content > p {
  margin: 16px 0 0;
  font-size: 0.97rem;
  line-height: 1.75;
  color: var(--text-secondary);
}

.page-about .about-team__roles {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-team__roles li {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  padding: 14px 16px;
  background: var(--bg-secondary);
  border-left: 2px solid var(--line);
  font-size: 0.93rem;
  line-height: 1.65;
  color: var(--text-primary);
  transition: border-left-color 0.2s ease;
}

.page-about .about-team__roles li:hover {
  border-left-color: var(--brand);
}

.page-about .about-team__roles li .mono {
  color: var(--brand);
  flex: 0 0 auto;
}

/* ---- 继续探索 ---- */
.page-about .about-followup {
  padding: 64px 0;
  background: var(--bg-secondary);
}

.page-about .about-followup .section-title {
  margin-bottom: 28px;
}

.page-about .about-followup__grid {
  display: grid;
  gap: 12px;
}

.page-about .about-followup__card {
  display: block;
  position: relative;
  padding: 22px 20px;
  background: var(--bg-primary);
  border: 1px solid var(--line);
  text-decoration: none;
  transition: border-color 0.2s ease, transform 0.2s ease;
  overflow: hidden;
}

.page-about .about-followup__card:hover {
  border-color: var(--brand);
  transform: translateY(-2px);
}

.page-about .about-followup__card-index {
  display: block;
  font-size: 13px;
  color: var(--brand);
  letter-spacing: 0.08em;
  margin-bottom: 14px;
}

.page-about .about-followup__card h3 {
  margin: 0 0 8px;
  font-family: var(--font-heading);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
}

.page-about .about-followup__card p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.65;
  color: var(--text-secondary);
}

/* ---- 移动端增强 ---- */
@media (min-width: 560px) {
  .page-about .about-capability__stats {
    grid-template-columns: 1fr 1fr;
  }

  .page-about .about-qualification__grid {
    grid-template-columns: 1fr 1fr;
  }
}

/* ---- 平板与桌面 ---- */
@media (min-width: 768px) {
  .page-about .about-hero {
    padding: 64px 0 88px;
  }

  .page-about .about-hero__inner {
    grid-template-columns: 55% 1fr;
    gap: 48px;
    align-items: center;
  }

  .page-about .about-hero__title {
    font-size: clamp(2.8rem, 5.5vw, 4.2rem);
  }

  .page-about .about-hero__lead {
    font-size: 1.05rem;
  }

  .page-about .about-position,
  .page-about .about-milestone,
  .page-about .about-qualification,
  .page-about .about-capability,
  .page-about .about-ecosystem,
  .page-about .about-team,
  .page-about .about-followup {
    padding: 84px 0;
  }

  .page-about .about-position__inner {
    grid-template-columns: 1fr 1.15fr;
    gap: 56px;
  }

  .page-about .about-position__principle {
    padding: 20px;
  }

  .page-about .about-milestone__layout {
    grid-template-columns: 2fr 1fr;
    gap: 48px;
  }

  .page-about .about-milestone__aside {
    position: sticky;
    top: 120px;
    align-self: start;
  }

  .page-about .about-ecosystem__map {
    display: block;
    min-height: 520px;
    max-width: 820px;
    margin-left: auto;
    margin-right: auto;
  }

  .page-about .about-ecosystem__lines {
    display: block;
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
  }

  .page-about .about-ecosystem__lines line {
    stroke: var(--line);
    stroke-width: 2;
    stroke-dasharray: 6 6;
  }

  .page-about .about-ecosystem__center {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    margin: 0;
    width: 150px;
    height: 150px;
  }

  .page-about .about-ecosystem__node {
    position: absolute;
    width: 170px;
    padding: 18px 14px;
  }

  .page-about .about-ecosystem__node--data {
    top: 10%;
    left: 10%;
  }

  .page-about .about-ecosystem__node--domestic {
    top: 10%;
    right: 10%;
  }

  .page-about .about-ecosystem__node--local {
    bottom: 10%;
    left: 10%;
  }

  .page-about .about-ecosystem__node--network {
    bottom: 10%;
    right: 10%;
  }

  .page-about .about-team__inner {
    grid-template-columns: 1.05fr 1fr;
    gap: 56px;
    align-items: center;
  }

  .page-about .about-followup__grid {
    grid-template-columns: 1fr 1fr 1fr 1fr;
  }
}

@media (min-width: 1024px) {
  .page-about .about-capability__stats {
    grid-template-columns: repeat(4, 1fr);
  }

  .page-about .about-capability__stat {
    padding: 26px 20px;
  }

  .page-about .about-capability__value .data-value {
    font-size: 2.3rem;
  }

  .page-about .about-qualification__card {
    padding: 30px 26px;
  }
}