.page-about {
  display: block;
  background: var(--ink);
  color: var(--white);
  font-family: var(--font-sans);
  --about-gap: clamp(20px, 3vw, 40px);
  --about-radius: 0;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(28px, 5vw, 56px) 0 clamp(40px, 7vw, 88px);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(138, 151, 184, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(138, 151, 184, 0.06) 1px, transparent 1px);
  background-size: 56px 56px;
  -webkit-mask-image: linear-gradient(180deg, #000 0%, rgba(0, 0, 0, 0.25) 70%, transparent 100%);
  mask-image: linear-gradient(180deg, #000 0%, rgba(0, 0, 0, 0.25) 70%, transparent 100%);
  pointer-events: none;
}

.page-about .about-hero > .wrap {
  position: relative;
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 5vw, 56px);
  margin-top: clamp(20px, 3vw, 36px);
}

.page-about .about-hero__title {
  margin: 18px 0 0;
  font-size: clamp(30px, 6.4vw, 68px);
  line-height: 1.12;
  letter-spacing: -0.02em;
  font-weight: 900;
  color: var(--white);
}

.page-about .about-hero__lede {
  margin-top: 20px;
  max-width: 34em;
  color: var(--mist);
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.85;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-about .about-hero__facts {
  list-style: none;
  margin: clamp(30px, 4vw, 48px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  clip-path: polygon(0 0, calc(100% - 14px) 0, 100% 14px, 100% 100%, 14px 100%, 0 calc(100% - 14px));
}

.page-about .about-fact {
  background: var(--panel);
  padding: 16px 18px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .about-fact__num {
  font-size: 26px;
  line-height: 1.1;
  color: var(--cyan);
  letter-spacing: 0.01em;
}

.page-about .about-fact:nth-child(2) .about-fact__num,
.page-about .about-fact:nth-child(4) .about-fact__num {
  color: var(--gold);
}

.page-about .about-fact__label {
  font-size: 12px;
  color: var(--mist);
  letter-spacing: 0.06em;
}

.page-about .about-hero__figure {
  margin: 0;
}

.page-about .figure__frame {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--panel);
  clip-path: polygon(0 0, calc(100% - 18px) 0, 100% 18px, 100% 100%, 18px 100%, 0 calc(100% - 18px));
}

.page-about .figure__frame::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(138, 151, 184, 0.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(138, 151, 184, 0.07) 1px, transparent 1px);
  background-size: 32px 32px;
  pointer-events: none;
  mix-blend-mode: screen;
}

.page-about .about-frame {
  aspect-ratio: 16 / 9;
}

.page-about .about-frame--square {
  aspect-ratio: 4 / 3;
}

.page-about .about-frame--road {
  aspect-ratio: 21 / 9;
}

.page-about .figure__frame img {
  display: block;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
}

.page-about .figure__caption {
  margin-top: 12px;
  font-size: 12px;
  line-height: 1.7;
  color: var(--mist);
  letter-spacing: 0.04em;
}

/* ---------- 主体：索引 + 面板堆叠 ---------- */
.page-about .about-body {
  padding: clamp(28px, 5vw, 60px) 0 clamp(56px, 9vw, 112px);
}

.page-about .about-body__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 56px);
}

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

.page-about .about-index__title {
  display: block;
  margin-bottom: 14px;
}

.page-about .about-index__axis {
  display: flex;
  flex-direction: column;
  gap: 0;
  border-left: 1px solid var(--line);
}

.page-about .index-axis__item {
  display: block;
  padding: 9px 0 9px 16px;
  font-size: 14px;
  line-height: 1.4;
  color: var(--mist);
  text-decoration: none;
  border-left: 2px solid transparent;
  margin-left: -1px;
  transition: color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease);
}

.page-about .index-axis__item:hover,
.page-about .index-axis__item:focus-visible {
  color: var(--glow);
  border-left-color: var(--cyan);
}

.page-about .about-panels {
  display: flex;
  flex-direction: column;
  gap: var(--about-gap);
}

/* ---------- 面板 ---------- */
.page-about .about-panel {
  position: relative;
  background: var(--panel);
  border: 1px solid var(--line);
  clip-path: polygon(0 0, calc(100% - 20px) 0, 100% 20px, 100% 100%, 20px 100%, 0 calc(100% - 20px));
  scroll-margin-top: 120px;
}

.page-about .about-panel:nth-child(even) {
  margin-left: 0;
}

.page-about .about-band {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 12px;
  display: block;
  opacity: 0.9;
}

.page-about .about-band--cyan {
  background: linear-gradient(90deg, var(--cyan) 0%, rgba(25, 227, 214, 0) 78%);
}

.page-about .about-band--violet {
  background: linear-gradient(90deg, var(--violet) 0%, rgba(122, 92, 255, 0) 78%);
}

.page-about .about-band--gold {
  background: linear-gradient(90deg, var(--gold) 0%, rgba(242, 180, 65, 0) 78%);
}

.page-about .panel__body {
  padding: clamp(26px, 4vw, 48px) clamp(20px, 3.4vw, 44px) clamp(26px, 4vw, 44px);
}

.page-about .about-panel__head {
  margin-bottom: clamp(22px, 3.4vw, 36px);
}

.page-about .section__title {
  margin: 14px 0 0;
  font-size: clamp(22px, 3.4vw, 34px);
  line-height: 1.28;
  letter-spacing: -0.02em;
  font-weight: 900;
  color: var(--white);
}

.page-about .section__desc {
  margin-top: 14px;
  max-width: 40em;
  font-size: 15px;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-panel__foot {
  margin: clamp(22px, 3vw, 32px) 0 0;
}

.page-about .about-panel__note {
  margin: clamp(20px, 3vw, 28px) 0 0;
  padding-left: 16px;
  border-left: 2px solid var(--cyan);
  font-size: 14px;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-link {
  display: inline-block;
  font-size: 14px;
  color: var(--glow);
  text-decoration: none;
  border-bottom: 1px solid rgba(185, 255, 247, 0.35);
  padding-bottom: 2px;
  transition: color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease);
}

.page-about .about-link::before {
  content: "→ ";
  color: var(--cyan);
}

.page-about .about-link:hover,
.page-about .about-link:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

/* ---------- 四项服务 ---------- */
.page-about .about-services {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-service {
  background: rgba(6, 11, 26, 0.55);
  padding: 22px 20px;
}

/* ---------- 服务地区 ---------- */
.page-about .about-coverage {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-coverage__stat {
  background: rgba(6, 11, 26, 0.55);
  padding: 22px 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.page-about .about-coverage__num {
  font-size: clamp(30px, 4.6vw, 46px);
  line-height: 1;
  color: var(--gold);
  letter-spacing: -0.01em;
}

.page-about .about-coverage__cap {
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--cyan);
}

.page-about .about-coverage__stat p {
  margin: 4px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 3.6vw, 40px);
}

.page-about .about-team__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-team__item {
  background: rgba(6, 11, 26, 0.55);
  padding: 18px 20px;
  display: grid;
  grid-template-columns: 56px minmax(0, 1fr);
  gap: 14px;
  align-items: start;
}

.page-about .about-team__num {
  font-size: 26px;
  line-height: 1;
  color: var(--violet);
  padding-top: 2px;
}

.page-about .about-team__item:nth-child(2) .about-team__num {
  color: var(--cyan);
}

.page-about .about-team__item:nth-child(3) .about-team__num {
  color: var(--gold);
}

.page-about .about-team__item:nth-child(4) .about-team__num {
  color: var(--mist);
}

.page-about .about-team__name {
  margin: 0 0 6px;
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--white);
}

.page-about .about-team__item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-team__figure {
  margin: 0;
  align-self: start;
}

/* ---------- 发展阶段 ---------- */
.page-about .about-road__figure {
  margin: 0 0 clamp(26px, 3.6vw, 40px);
}

.page-about .about-road {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
  counter-reset: road;
}

.page-about .about-road__node {
  position: relative;
  padding: 20px 0 20px 30px;
  border-left: 1px solid var(--line);
}

.page-about .about-road__node:last-child {
  border-left-color: transparent;
}

.page-about .about-road__dot {
  position: absolute;
  left: -5px;
  top: 26px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--cyan);
  box-shadow: 0 0 0 4px rgba(25, 227, 214, 0.12);
}

.page-about .about-road__node:nth-child(2) .about-road__dot {
  border-color: var(--violet);
  box-shadow: 0 0 0 4px rgba(122, 92, 255, 0.14);
}

.page-about .about-road__node:nth-child(3) .about-road__dot {
  border-color: var(--gold);
  box-shadow: 0 0 0 4px rgba(242, 180, 65, 0.14);
}

.page-about .about-road__node:nth-child(5) .about-road__dot {
  border-color: var(--glow);
  box-shadow: 0 0 0 4px rgba(185, 255, 247, 0.16);
}

.page-about .about-road__stamp {
  display: inline-block;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--mist);
  padding: 2px 8px;
  border: 1px solid var(--line);
}

.page-about .about-road__title {
  margin: 12px 0 8px;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.45;
  color: var(--white);
}

.page-about .about-road__node p {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--mist);
  max-width: 44em;
}

/* ---------- 稳定能力 ---------- */
.page-about .about-stability {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-stability__item {
  background: rgba(6, 11, 26, 0.55);
  padding: 22px 20px;
}

/* ---------- 合作生态 ---------- */
.page-about .about-tags {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-tag {
  background: rgba(6, 11, 26, 0.55);
  padding: 16px 18px;
  outline: none;
  transition: background var(--t-fast) var(--ease);
}

.page-about .about-tag:hover,
.page-about .about-tag:focus-visible {
  background: rgba(122, 92, 255, 0.12);
}

.page-about .about-tag__name {
  display: block;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--white);
}

.page-about .about-tag__note {
  display: block;
  font-size: 13px;
  line-height: 1.8;
  color: var(--mist);
  margin-top: 8px;
  max-height: 6em;
  overflow: hidden;
}

/* ---------- 一起做事 ---------- */
.page-about .about-panel--cta {
  background: linear-gradient(160deg, rgba(25, 227, 214, 0.08) 0%, rgba(122, 92, 255, 0.08) 55%, rgba(6, 11, 26, 0) 100%), var(--panel);
}

.page-about .about-start {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-start__step {
  background: rgba(6, 11, 26, 0.5);
  padding: 22px 20px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.page-about .about-start__idx {
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--gold);
}

.page-about .about-start__step h3 {
  margin: 0;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--white);
}

.page-about .about-start__step p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
  flex: 1 1 auto;
}

.page-about .about-start__step .about-link {
  margin-top: 4px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .about-services {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .about-coverage {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .about-stability {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .about-tags {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .about-start {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: start;
    gap: clamp(36px, 5vw, 72px);
  }

  .page-about .about-index {
    display: block;
    position: sticky;
    top: 128px;
    align-self: start;
  }

  .page-about .about-body__grid {
    grid-template-columns: minmax(150px, 190px) minmax(0, 1fr);
    gap: clamp(32px, 4.4vw, 68px);
  }

  .page-about .about-panels {
    gap: clamp(30px, 3.6vw, 52px);
  }

  .page-about .about-panel:nth-child(even) {
    margin-left: clamp(16px, 2.4vw, 36px);
  }

  .page-about .about-panel:nth-child(odd) {
    margin-right: clamp(16px, 2.4vw, 36px);
  }

  .page-about .about-team {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: start;
  }

  .page-about .about-stability {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-tags {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-start {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-road {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 0;
  }

  .page-about .about-road__node {
    padding: 20px 18px 4px;
    border-left: none;
    border-top: 1px solid var(--line);
  }

  .page-about .about-road__node:nth-child(1) {
    border-top-color: var(--cyan);
  }

  .page-about .about-road__node:nth-child(3) {
    border-top-color: var(--gold);
  }

  .page-about .about-road__node:last-child {
    border-top-color: var(--glow);
  }

  .page-about .about-road__dot {
    left: 20px;
    top: -5px;
  }

  .page-about .about-road__title {
    font-size: 16px;
  }
}

@media (min-width: 1100px) {
  .page-about .about-hero__title {
    max-width: 15em;
  }

  .page-about .panel__body {
    padding-inline: clamp(36px, 4vw, 56px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}