.page-about {
  --about-rail: 236px;
  --about-gap: clamp(24px, 4vw, 56px);
  background: var(--ink);
  color: var(--text);
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  padding-top: clamp(14px, 2vw, 22px);
  padding-bottom: clamp(10px, 1.6vw, 16px);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--muted);
}
.page-about .breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-about .breadcrumb__list a {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.page-about .breadcrumb__list a:hover,
.page-about .breadcrumb__list a:focus-visible {
  color: var(--volt);
  border-bottom-color: var(--volt);
}
.page-about .breadcrumb__list [aria-current="page"] {
  color: var(--text);
}
.page-about .breadcrumb__sep {
  color: var(--grid-strong);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(30px, 5.5vw, 66px) 0 clamp(28px, 4.5vw, 54px);
  border-bottom: 1px solid var(--grid-strong);
  background:
    radial-gradient(115% 82% at 88% 4%, rgba(31, 169, 122, 0.26), rgba(8, 19, 31, 0) 58%),
    radial-gradient(90% 70% at 2% 100%, rgba(255, 106, 31, 0.14), rgba(8, 19, 31, 0) 62%),
    linear-gradient(158deg, var(--ink-deep) 0%, var(--ink) 52%, var(--night) 100%);
}
.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(var(--grid-body) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-body) 1px, transparent 1px);
  background-size: 88px 88px;
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.9), transparent 92%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.9), transparent 92%);
}
.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(26px, 4vw, 44px);
}
.page-about .about-hero h1 {
  margin: 14px 0 18px;
  max-width: 22ch;
  color: var(--text);
}
.page-about .about-mark {
  color: var(--volt);
  white-space: nowrap;
}
.page-about .about-hero .lede {
  max-width: 34ch;
  color: var(--text);
  opacity: 0.9;
}
.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .about-board {
  display: grid;
  gap: 18px;
  padding: clamp(18px, 2.4vw, 26px);
  border: 1px solid var(--grid-strong);
  background: linear-gradient(180deg, rgba(14, 59, 46, 0.55), rgba(8, 19, 31, 0.88));
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 22px), calc(100% - 22px) 100%, 0 100%);
}
.page-about .about-board__top {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--grid);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--muted);
}
.page-about .about-board__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px 18px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-about .about-board__stats li {
  display: grid;
  gap: 3px;
  padding-left: 12px;
  border-left: 1px solid var(--grid-strong);
}
.page-about .about-board__num {
  font-size: clamp(28px, 3.4vw, 40px);
  line-height: 1;
  color: var(--text);
}
.page-about .about-board__num--volt {
  color: var(--volt);
}
.page-about .about-board__label {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--muted);
}

@media (min-width: 960px) {
  .page-about .about-hero__grid {
    grid-template-columns: 7fr 5fr;
    align-items: end;
  }
}

/* ---------- 左侧索引 / 时间轴 ---------- */
.page-about .about-shell {
  padding-top: clamp(26px, 4vw, 46px);
}
.page-about .about-rail {
  margin-bottom: clamp(24px, 3vw, 34px);
  padding: 14px 0;
  border-top: 1px solid var(--grid);
  border-bottom: 1px solid var(--grid);
}
.page-about .about-rail__title {
  margin: 0 0 10px;
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--muted);
}
.page-about .about-rail__list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0 16px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-about .about-rail__link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 0;
  font-size: 13.5px;
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid var(--grid);
  transition: color var(--dur) var(--ease);
}
.page-about .about-rail__link::before {
  content: "";
  flex: none;
  width: 8px;
  height: 8px;
  background: var(--night);
  border: 1px solid var(--grid-strong);
  transform: rotate(45deg);
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  color: var(--volt);
}
.page-about .about-rail__link:hover::before,
.page-about .about-rail__link:focus-visible::before {
  background: var(--signal);
  border-color: var(--volt);
}

@media (min-width: 1000px) {
  .page-about .about-shell {
    display: grid;
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: var(--about-gap);
    align-items: start;
  }
  .page-about .about-rail {
    position: sticky;
    top: 104px;
    margin-bottom: 0;
    border-bottom: 1px solid var(--grid);
  }
  .page-about .about-rail__list {
    position: relative;
    grid-template-columns: minmax(0, 1fr);
    gap: 0;
  }
  .page-about .about-rail__list::before {
    content: "";
    position: absolute;
    left: 4px;
    top: 0;
    bottom: 0;
    width: 1px;
    background: var(--grid);
  }
}

/* ---------- 章节通用 ---------- */
.page-about .about-sec {
  padding: clamp(32px, 5.5vw, 62px) 0;
  border-bottom: 1px solid var(--grid);
  scroll-margin-top: 96px;
}
.page-about .about-sec:last-of-type {
  border-bottom: 0;
}
.page-about .about-head {
  display: grid;
  gap: 8px;
  margin-bottom: clamp(20px, 3vw, 32px);
  padding-bottom: 14px;
  border-bottom: 1px solid var(--grid);
}
.page-about .about-head h2 {
  margin: 0;
  color: var(--text);
}
.page-about .about-sec .prose {
  max-width: 62ch;
  color: var(--text);
}
.page-about .about-sec .prose p {
  margin-top: 0;
}

/* ---------- 深色底上的展签标签 ---------- */
.page-about .about-origin__text > .tag {
  display: inline-block;
  margin-bottom: 16px;
}

/* ---------- 业务版图 ---------- */
.page-about .about-lines {
  display: grid;
  gap: 14px;
  margin-top: clamp(22px, 3vw, 34px);
}
.page-about .about-line {
  padding: 20px 18px 22px;
  border: 1px solid var(--grid-strong);
  border-top: 3px solid var(--pitch);
  background: rgba(14, 59, 46, 0.35);
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease),
    transform var(--dur) var(--ease);
}
.page-about .about-line:hover {
  border-color: var(--signal);
  border-top-color: var(--signal);
  background: rgba(255, 106, 31, 0.09);
  transform: translateY(-3px);
}
.page-about .about-line__index {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--signal);
}
.page-about .about-line h3 {
  margin: 10px 0 8px;
  font-size: 19px;
  color: var(--text);
}
.page-about .about-line p:not(.about-line__index) {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted);
}

@media (min-width: 820px) {
  .page-about .about-lines {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
  }
  .page-about .about-lines > *:nth-child(2) {
    margin-top: 32px;
  }
  .page-about .about-lines > *:nth-child(3) {
    margin-top: 64px;
  }
}

/* ---------- 原料来源 ---------- */
.page-about .about-origin {
  display: grid;
  gap: clamp(20px, 3vw, 34px);
}
.page-about .about-origin__media {
  margin: 0;
}
.page-about .about-origin .media__frame {
  border: 1px solid var(--grid-strong);
}
.page-about .about-origin .media__img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}
.page-about .about-origin .media__caption {
  margin-top: 10px;
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--muted);
}
.page-about .about-origin__text .prose p + p {
  margin-top: 16px;
}

@media (min-width: 900px) {
  .page-about .about-origin {
    grid-template-columns: 5fr 7fr;
    align-items: start;
  }
}

.page-about .about-map {
  margin-top: clamp(22px, 3vw, 34px);
  padding: clamp(12px, 2vw, 22px);
  border: 1px solid var(--grid);
  background: linear-gradient(180deg, rgba(14, 59, 46, 0.35), rgba(8, 19, 31, 0.62));
  overflow-x: auto;
}
.page-about .about-svg {
  display: block;
  width: 100%;
  min-width: 300px;
  height: auto;
}
.page-about .about-wires line {
  stroke: var(--grid-strong);
  stroke-width: 1;
}
.page-about .about-node circle {
  fill: var(--night);
  stroke: var(--pitch);
  stroke-width: 1.5;
  transition: fill var(--dur) var(--ease), stroke var(--dur) var(--ease);
}
.page-about .about-node text {
  fill: var(--text);
  font-size: 13px;
  font-family: var(--font-body);
}
.page-about .about-node:hover circle,
.page-about .about-node:focus-within circle {
  fill: var(--signal);
  stroke: var(--volt);
}
.page-about .about-node:hover text,
.page-about .about-node:focus-within text {
  fill: var(--volt);
}
.page-about .about-hub rect {
  fill: var(--pitch);
}
.page-about .about-hub text {
  fill: var(--ink-deep);
  font-size: 15px;
  font-weight: 700;
  font-family: var(--font-body);
}
.page-about .about-sup circle {
  fill: var(--signal);
  opacity: 0.85;
  transition: opacity var(--dur) var(--ease), r var(--dur) var(--ease);
}
.page-about .about-sup:hover circle {
  opacity: 1;
}
.page-about .about-sup-label text {
  fill: var(--muted);
  font-size: 12px;
  font-family: var(--font-mono);
}
.page-about .about-map__legend {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 20px;
  margin: 14px 0 0;
  padding: 0;
  list-style: none;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--muted);
}
.page-about .about-map__legend li {
  display: flex;
  align-items: center;
  gap: 8px;
}
.page-about .about-map__key {
  width: 10px;
  height: 10px;
  flex: none;
  display: inline-block;
}
.page-about .about-map__key--base {
  border: 1px solid var(--pitch);
  background: var(--night);
}
.page-about .about-map__key--sup {
  background: var(--signal);
}
.page-about .about-map__key--hub {
  background: var(--pitch);
}

/* ---------- 产能与交付 ---------- */
.page-about .about-cap {
  display: grid;
  gap: clamp(22px, 3vw, 36px);
}
.page-about .about-cap__media {
  margin: 0;
}
.page-about .about-cap .media__frame {
  border: 1px solid var(--grid-strong);
}
.page-about .about-cap .media__img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}
.page-about .about-cap .media__caption {
  margin-top: 10px;
  font-size: 12.5px;
  color: var(--muted);
}

.page-about .about-meter {
  padding: 18px;
  border: 1px solid var(--grid-strong);
  background: rgba(8, 19, 31, 0.55);
}
.page-about .about-meter__row {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 12px;
}
.page-about .about-meter__label {
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--muted);
}
.page-about .about-meter__value {
  font-family: var(--font-mono);
  font-size: clamp(28px, 4vw, 42px);
  line-height: 1;
  color: var(--volt);
  font-variant-numeric: tabular-nums;
}
.page-about .about-meter__track {
  position: relative;
  height: 16px;
  background: rgba(31, 169, 122, 0.16);
  border: 1px solid var(--grid);
  overflow: hidden;
}
.page-about .about-meter__fill {
  position: absolute;
  inset: 0 auto 0 0;
  width: 100%;
  background: repeating-linear-gradient(
    90deg,
    var(--pitch) 0 10px,
    rgba(31, 169, 122, 0.5) 10px 20px
  );
}
.page-about .about-meter__scale {
  display: flex;
  justify-content: space-between;
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--muted);
}

.page-about .about-steps {
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
}
.page-about .about-steps li {
  display: grid;
  grid-template-columns: 88px minmax(0, 1fr);
  gap: 14px;
  padding: 14px 0;
  border-top: 1px solid var(--grid);
}
.page-about .about-steps li:last-child {
  border-bottom: 1px solid var(--grid);
}
.page-about .about-steps__when {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--signal);
}
.page-about .about-steps__what strong {
  display: block;
  margin-bottom: 4px;
  font-size: 15.5px;
  font-weight: 600;
  color: var(--text);
}
.page-about .about-steps__what span {
  display: block;
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}
.page-about .about-cap__note {
  margin-top: clamp(20px, 3vw, 30px);
}

@media (min-width: 900px) {
  .page-about .about-cap {
    grid-template-columns: 7fr 5fr;
    align-items: start;
  }
}

/* ---------- 服务网络 ---------- */
.page-about .about-service {
  display: grid;
  gap: 14px;
  margin-top: clamp(20px, 3vw, 30px);
}
.page-about .about-service__item {
  padding: 20px 18px;
  border: 1px solid var(--grid-strong);
  background: rgba(14, 59, 46, 0.35);
  border-left: 3px solid var(--pitch);
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}
.page-about .about-service__item--device {
  border-left-color: var(--signal);
}
.page-about .about-service__item:hover {
  background: rgba(31, 169, 122, 0.12);
  border-color: var(--grid-strong);
  border-left-color: var(--volt);
}
.page-about .about-service__item h3 {
  margin: 10px 0 8px;
  font-size: 19px;
  color: var(--text);
}
.page-about .about-service__item p:not(.about-line__index) {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted);
}
.page-about .about-service__link {
  display: inline-block;
  font-size: 13.5px;
  color: var(--pitch);
  text-decoration: none;
  border-bottom: 1px solid var(--grid-strong);
  padding-bottom: 2px;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.page-about .about-service__link:hover,
.page-about .about-service__link:focus-visible {
  color: var(--volt);
  border-bottom-color: var(--volt);
}

@media (min-width: 820px) {
  .page-about .about-service {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }
}

/* ---------- 发展节点 ---------- */
.page-about .about-timeline {
  position: relative;
  margin: 0;
  padding: 0 0 0 24px;
  list-style: none;
  display: grid;
  gap: clamp(18px, 2.4vw, 26px);
}
.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: var(--grid-strong);
}
.page-about .about-timeline li {
  position: relative;
}
.page-about .about-timeline li::before {
  content: "";
  position: absolute;
  left: -24px;
  top: 6px;
  width: 11px;
  height: 11px;
  background: var(--ink);
  border: 2px solid var(--pitch);
  transform: rotate(45deg);
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.page-about .about-timeline li:hover::before {
  background: var(--signal);
  border-color: var(--volt);
}
.page-about .about-timeline h3 {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.06em;
  color: var(--volt);
}
.page-about .about-timeline p {
  margin: 0;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--muted);
}

/* ---------- 团队与资质（暖纸色区） ---------- */
.page-about .about-sec--paper {
  margin-top: clamp(10px, 1.6vw, 18px);
  padding: clamp(28px, 4.6vw, 54px) clamp(18px, 3vw, 34px);
  background: var(--paper);
  color: var(--on-paper);
  border-bottom: 1px solid transparent;
}
.page-about .about-sec--paper .about-head {
  border-bottom-color: rgba(11, 26, 18, 0.16);
}
.page-about .about-sec--paper .about-head h2 {
  color: var(--on-paper);
}
.page-about .about-sec--paper .eyebrow {
  color: var(--on-paper-muted);
}
.page-about .about-sec--paper .prose {
  color: var(--on-paper);
}

.page-about .about-team {
  display: grid;
  gap: 14px;
  margin-top: clamp(22px, 3vw, 32px);
}
.page-about .about-team__card {
  height: 190px;
  perspective: 900px;
  outline: none;
}
.page-about .about-team__card:focus-visible {
  box-shadow: 0 0 0 2px var(--signal);
}
.page-about .about-team__inner {
  position: relative;
  width: 100%;
  height: 100%;
  transform-style: preserve-3d;
  transition: transform 320ms var(--ease);
}
.page-about .about-team__card:hover .about-team__inner,
.page-about .about-team__card:focus-within .about-team__inner,
.page-about .about-team__card:focus .about-team__inner {
  transform: rotateY(180deg);
}
.page-about .about-team__face {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 10px;
  padding: 18px 16px;
  -webkit-backface-visibility: hidden;
  backface-visibility: hidden;
  border: 1px solid rgba(11, 26, 18, 0.16);
  background: rgba(255, 255, 255, 0.66);
}
.page-about .about-team__face--front h3 {
  margin: 0 0 6px;
  font-size: 20px;
  color: var(--on-paper);
}
.page-about .about-team__face--front p:not(.about-team__index) {
  margin: 0;
  font-size: 14px;
  line-height: 1.65;
  color: var(--on-paper-muted);
}
.page-about .about-team__index {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  color: var(--signal);
}
.page-about .about-team__face--front::after {
  content: "移入查看职责 →";
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--on-paper-muted);
}
.page-about .about-team__face--back {
  transform: rotateY(180deg);
  background: var(--night);
  border-color: var(--night);
  justify-content: center;
}
.page-about .about-team__face--back p {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--text);
}

.page-about .about-team__media {
  margin: clamp(24px, 3vw, 36px) 0 0;
}
.page-about .about-team__media .media__frame {
  border: 1px solid rgba(11, 26, 18, 0.18);
}
.page-about .about-team__media .media__img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}
.page-about .about-team__media .media__caption {
  margin-top: 10px;
  font-size: 12.5px;
  color: var(--on-paper-muted);
}

@media (min-width: 760px) {
  .page-about .about-team {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }
}
@media (min-width: 1120px) {
  .page-about .about-team {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 合作生态 ---------- */
.page-about .about-partners {
  display: grid;
  gap: 14px;
  margin-top: clamp(22px, 3vw, 32px);
}
.page-about .about-partners__item {
  padding: 18px 18px 20px;
  border: 1px solid var(--grid-strong);
  border-bottom: 3px solid var(--night);
  background: linear-gradient(180deg, rgba(14, 59, 46, 0.42), rgba(8, 19, 31, 0.5));
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}
.page-about .about-partners__item:hover {
  border-bottom-color: var(--signal);
  background: rgba(31, 169, 122, 0.14);
}
.page-about .about-partners__item h3 {
  margin: 0 0 8px;
  font-size: 18px;
  color: var(--volt);
}
.page-about .about-partners__item p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--muted);
}

@media (min-width: 820px) {
  .page-about .about-partners {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
  }
}

.page-about .about-cta {
  display: grid;
  gap: 22px;
  margin-top: clamp(24px, 3.4vw, 38px);
  padding: clamp(20px, 3vw, 30px);
  border: 1px solid var(--grid-strong);
  background:
    linear-gradient(135deg, rgba(255, 106, 31, 0.16), rgba(8, 19, 31, 0) 55%),
    var(--night);
}
.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}
.page-about .about-cta__contact p {
  margin: 0 0 8px;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--text);
}
.page-about .about-cta__note {
  font-size: 13px;
  color: var(--muted);
}
.page-about .about-cta .copy-chip {
  font-family: var(--font-mono);
  font-size: 13.5px;
}

@media (min-width: 900px) {
  .page-about .about-cta {
    grid-template-columns: 5fr 7fr;
    align-items: center;
  }
}

/* ---------- 进场反馈 ---------- */
.page-about [data-reveal] {
  opacity: 0.001;
  transform: translateY(14px);
  transition: opacity 320ms var(--ease), transform 320ms var(--ease);
}
.page-about [data-reveal][data-visible] {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    animation: none !important;
    transition: none !important;
  }
  .page-about .about-line:hover {
    transform: none;
  }
  .page-about [data-reveal] {
    opacity: 1;
    transform: none;
  }
  .page-about .about-team__card:hover .about-team__inner,
  .page-about .about-team__card:focus-within .about-team__inner,
  .page-about .about-team__card:focus .about-team__inner {
    transform: none;
  }
  .page-about .about-team__face--back {
    transform: none;
  }
  .page-about .about-team__card {
    height: auto;
  }
  .page-about .about-team__face {
    position: static;
  }
}