.page-about {
  --about-rail: 250px;
  --about-gap: clamp(24px, 3.6vw, 60px);
  --about-pad: clamp(22px, 3vw, 34px);
  --about-card-line: rgba(201, 212, 232, .22);
  --about-tint: rgba(23, 41, 90, .62);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(22px, 4vw, 46px) 0 clamp(26px, 4vw, 52px);
  background:
    radial-gradient(120% 96% at 86% 6%, rgba(53, 224, 210, .13), transparent 58%),
    radial-gradient(90% 70% at 8% 100%, rgba(233, 162, 59, .08), transparent 62%),
    var(--ink-base);
  border-bottom: 1px solid var(--line-hair);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(26px, 4vw, 44px);
  align-items: center;
}

.page-about .about-hero__eyebrow {
  margin: 16px 0 10px;
  font-family: var(--font-num);
  font-size: var(--fs-micro);
  letter-spacing: .18em;
  color: var(--cyan);
}

.page-about .about-hero h1 {
  margin: 0 0 16px;
  font-family: var(--font-head);
  font-size: clamp(27px, 5.6vw, var(--fs-h1));
  font-weight: 800;
  line-height: 1.24;
  letter-spacing: -.015em;
  color: var(--on-dark);
}

.page-about .about-hero__lead {
  max-width: 40em;
  margin: 0;
  font-size: 16px;
  line-height: 1.8;
  color: var(--on-dark-dim);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .about-hero__dial {
  display: flex;
  justify-content: center;
  align-items: center;
}

.page-about .about-dial {
  display: block;
  width: min(100%, 320px);
  height: auto;
}

.page-about .about-dial__ring {
  fill: none;
  stroke: var(--line-hair);
  stroke-width: 1;
}

.page-about .about-dial__ring-soft {
  fill: none;
  stroke: var(--line-soft);
  stroke-width: 1;
  stroke-dasharray: 3 9;
}

.page-about .about-dial__ticks line {
  stroke: var(--stone);
  stroke-width: 1.6;
  stroke-linecap: round;
  opacity: .75;
}

.page-about .about-dial__arc {
  fill: none;
  stroke: var(--cyan);
  stroke-width: 3.5;
  stroke-linecap: round;
}

.page-about .about-dial__needle {
  stroke: var(--amber);
  stroke-width: 2.5;
  stroke-linecap: round;
}

.page-about .about-dial__hub {
  fill: var(--amber);
}

.page-about .about-dial__label {
  fill: var(--on-dark);
  font-family: var(--font-num);
  font-size: 26px;
  font-weight: 700;
  letter-spacing: .12em;
}

.page-about .about-dial__sub {
  fill: var(--stone);
  font-family: var(--font-num);
  font-size: 9px;
  letter-spacing: .06em;
}

/* 首屏规模条 */
.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(26px, 3.6vw, 42px) 0 0;
  padding: 0;
  border: 1px solid var(--about-card-line);
  border-radius: var(--r);
  background: var(--about-card-line);
  overflow: hidden;
}

.page-about .about-stats__item {
  margin: 0;
  padding: 15px 16px 17px;
  background: rgba(23, 41, 90, .78);
}

.page-about .about-stats__item dt,
.page-about .about-stats__item dd {
  margin: 0;
}

.page-about .about-stats__label {
  margin-bottom: 6px;
  font-size: var(--fs-micro);
  letter-spacing: .05em;
  color: var(--stone);
}

.page-about .about-stats__num {
  font-family: var(--font-num);
  font-size: 23px;
  font-weight: 700;
  line-height: 1.25;
  color: var(--on-dark);
  overflow-wrap: anywhere;
}

.page-about .about-stats__num .num {
  color: var(--amber);
}

.page-about .about-stats__num .num-unit {
  margin: 0 6px 0 2px;
  font-size: var(--fs-note);
  font-weight: 500;
  color: var(--on-dark-dim);
}

/* ---------- 通用小件 ---------- */
.page-about .about-kicker {
  margin: 0;
  font-family: var(--font-num);
  font-size: var(--fs-micro);
  letter-spacing: .18em;
  color: var(--cyan);
}

.page-about .about-h2 {
  margin: 10px 0 14px;
  font-family: var(--font-head);
  font-size: clamp(22px, 3.4vw, var(--fs-h2));
  font-weight: 800;
  line-height: 1.3;
  letter-spacing: -.012em;
  color: var(--on-dark);
}

.page-about .about-lead {
  max-width: 62em;
  margin: 0 0 clamp(20px, 3vw, 30px);
  font-size: 16px;
  line-height: 1.8;
  color: var(--on-dark-dim);
}

/* ---------- 业务范围：左窄右宽 ---------- */
.page-about .about-band__grid {
  display: grid;
  gap: clamp(20px, 3vw, 38px);
}

.page-about .about-band__rail {
  padding-top: 14px;
  border-top: 2px solid var(--cyan);
}

.page-about .about-band__rail .about-h2 {
  margin-top: 8px;
}

.page-about .about-cards {
  display: grid;
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-card {
  position: relative;
  padding: 22px 20px 24px;
  border: 1px solid var(--about-card-line);
  border-radius: var(--r);
  background: linear-gradient(180deg, rgba(23, 41, 90, .92), rgba(23, 41, 90, .58));
  transition: transform var(--dur) ease, border-color var(--dur) ease;
}

.page-about .about-card::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--cyan), rgba(53, 224, 210, 0));
  opacity: 0;
  transition: opacity var(--dur) ease;
}

.page-about .about-card:hover,
.page-about .about-card:focus-within {
  transform: translateY(-3px);
  border-color: rgba(53, 224, 210, .42);
}

.page-about .about-card:hover::after,
.page-about .about-card:focus-within::after {
  opacity: 1;
}

.page-about .about-card__no {
  margin: 0 0 10px;
  font-family: var(--font-num);
  font-size: var(--fs-micro);
  letter-spacing: .22em;
  color: var(--cyan);
}

.page-about .about-card__title {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: var(--fs-h4);
  font-weight: 800;
  letter-spacing: -.008em;
  color: var(--on-dark);
}

.page-about .about-card p:last-child {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--on-dark-dim);
}

.page-about .about-audience {
  margin-top: clamp(24px, 3.4vw, 40px);
  padding-top: 20px;
  border-top: 1px solid var(--line-hair);
}

.page-about .about-audience__title {
  margin: 0 0 14px;
  font-family: var(--font-head);
  font-size: var(--fs-h4);
  font-weight: 800;
  color: var(--on-dark);
}

.page-about .about-audience__list {
  display: grid;
  gap: 1px;
  margin: 0;
  padding: 0;
  border: 1px solid var(--line-hair);
  border-radius: var(--r);
  background: var(--line-hair);
  overflow: hidden;
}

.page-about .about-audience__item {
  margin: 0;
  padding: 15px 17px 17px;
  background: rgba(14, 27, 58, .66);
}

.page-about .about-audience__item dt {
  margin-bottom: 5px;
  font-size: var(--fs-note);
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--mint);
}

.page-about .about-audience__item dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--on-dark-dim);
}

/* ---------- 发展历程 ---------- */
.page-about .about-history__head {
  max-width: 760px;
  margin-bottom: clamp(18px, 2.6vw, 26px);
}

.page-about .about-history__jump {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: clamp(24px, 3.4vw, 38px);
}

.page-about .about-history__jump a {
  display: inline-block;
  padding: 7px 14px;
  border: 1px solid var(--about-card-line);
  border-radius: 999px;
  font-family: var(--font-num);
  font-size: var(--fs-note);
  color: var(--on-dark-dim);
  text-decoration: none;
  transition: color var(--dur) ease, background var(--dur) ease, border-color var(--dur) ease;
}

.page-about .about-history__jump a:hover,
.page-about .about-history__jump a:focus-visible {
  color: var(--ink-base);
  background: var(--cyan);
  border-color: var(--cyan);
}

.page-about .about-history__grid {
  display: grid;
  gap: clamp(26px, 3.6vw, 46px);
}

.page-about .about-track {
  --track-x: 6px;
  position: relative;
  margin: 0;
  padding: 0 0 0 32px;
  list-style: none;
}

.page-about .about-track::before {
  content: "";
  position: absolute;
  left: var(--track-x);
  top: 8px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(180deg, rgba(53, 224, 210, .55), rgba(201, 212, 232, .22) 42%, rgba(201, 212, 232, .1));
}

.page-about .about-track__item {
  position: relative;
  padding-bottom: 26px;
}

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

.page-about .about-track__item::before {
  content: "";
  position: absolute;
  left: -31px;
  top: 6px;
  width: 11px;
  height: 11px;
  border: 2px solid var(--stone);
  border-radius: 50%;
  background: var(--ink-base);
  transition: border-color var(--dur) ease, box-shadow var(--dur) ease;
}

.page-about .about-track__item:hover::before,
.page-about .about-track__item:focus-within::before {
  border-color: var(--cyan);
  box-shadow: 0 0 0 5px rgba(53, 224, 210, .16);
}

.page-about .about-track__year {
  margin: 0 0 3px;
  font-family: var(--font-num);
  font-size: 15px;
  letter-spacing: .12em;
  color: var(--cyan);
}

.page-about .about-track__title {
  margin: 0 0 6px;
  font-family: var(--font-head);
  font-size: var(--fs-h4);
  font-weight: 800;
  color: var(--on-dark);
}

.page-about .about-track__text {
  max-width: 46em;
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--on-dark-dim);
}

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

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

/* ---------- 团队与角色 ---------- */
.page-about .about-team__head {
  max-width: 780px;
  margin-bottom: clamp(22px, 3.2vw, 34px);
}

.page-about .about-team__grid {
  display: grid;
  gap: clamp(22px, 3.2vw, 38px);
}

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

.page-about .about-team__roles {
  display: grid;
  gap: 10px;
}

.page-about .about-role {
  margin: 0;
  border: 1px solid var(--line);
  border-left: 3px solid var(--clay);
  border-radius: var(--r);
  background: var(--paper);
  color: var(--ink);
  box-shadow: 0 1px 0 rgba(10, 16, 36, .1), 0 12px 28px rgba(10, 16, 36, .3);
  transition: transform var(--dur) ease, box-shadow var(--dur) ease;
}

.page-about .about-role:hover {
  transform: translateY(-2px);
  box-shadow: 0 1px 0 rgba(10, 16, 36, .1), 0 18px 36px rgba(10, 16, 36, .36);
}

.page-about .about-role > .fold__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 5px 12px;
  padding: 15px 18px;
  cursor: pointer;
}

.page-about .about-role > .fold__head::-webkit-details-marker {
  display: none;
}

.page-about .about-role .fold__no {
  font-family: var(--font-num);
  font-size: var(--fs-micro);
  letter-spacing: .16em;
  color: var(--clay);
}

.page-about .about-role__name {
  font-family: var(--font-head);
  font-size: var(--fs-h4);
  font-weight: 800;
  letter-spacing: -.012em;
  color: var(--ink);
}

.page-about .about-role .fold__summary {
  flex: 1 1 100%;
  font-size: var(--fs-note);
  line-height: 1.6;
  color: var(--on-paper-dim);
}

.page-about .about-role .fold__body {
  padding: 0 18px 18px;
}

.page-about .about-role .fold__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--on-paper-dim);
}

.page-about .about-role[open] {
  border-left-color: var(--cyan);
}

/* ---------- 服务网络 ---------- */
.page-about .about-network__head {
  max-width: 760px;
  margin-bottom: clamp(22px, 3.2vw, 34px);
}

.page-about .about-net {
  display: grid;
  gap: clamp(22px, 3.2vw, 36px);
}

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

.page-about .about-net__switcher {
  position: relative;
}

.page-about .about-net__radio {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  border: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

.page-about .about-net__tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 16px;
}

.page-about .about-net__tab {
  padding: 8px 16px;
  border: 1px solid var(--about-card-line);
  border-radius: 999px;
  font-size: var(--fs-note);
  font-weight: 700;
  color: var(--on-dark-dim);
  cursor: pointer;
  user-select: none;
  transition: color var(--dur) ease, background var(--dur) ease, border-color var(--dur) ease;
}

.page-about .about-net__tab:hover {
  color: var(--on-dark);
  border-color: rgba(53, 224, 210, .5);
}

.page-about #net-south:checked ~ .about-net__tabs .about-net__tab[for="net-south"],
.page-about #net-east:checked ~ .about-net__tabs .about-net__tab[for="net-east"],
.page-about #net-central:checked ~ .about-net__tabs .about-net__tab[for="net-central"] {
  color: var(--ink-base);
  background: var(--cyan);
  border-color: var(--cyan);
}

.page-about .about-net__radio:focus-visible ~ .about-net__tabs .about-net__tab {
  outline: 2px solid var(--amber);
  outline-offset: 2px;
}

.page-about .about-net__panel {
  display: none;
  padding: 20px 22px 22px;
  border: 1px solid var(--about-card-line);
  border-left: 3px solid var(--amber);
  border-radius: var(--r);
  background: var(--about-tint);
}

.page-about #net-south:checked ~ .about-net__panels > #panel-south,
.page-about #net-east:checked ~ .about-net__panels > #panel-east,
.page-about #net-central:checked ~ .about-net__panels > #panel-central {
  display: block;
  animation: about-panel-in var(--dur) ease both;
}

@keyframes about-panel-in {
  from {
    opacity: 0;
    transform: translateY(6px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

.page-about .about-net__panel h3 {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-size: var(--fs-h4);
  font-weight: 800;
  color: var(--on-dark);
}

.page-about .about-net__panel p {
  margin: 0 0 12px;
  font-size: 15px;
  line-height: 1.78;
  color: var(--on-dark-dim);
}

.page-about .about-net__meta {
  margin: 0;
  font-family: var(--font-num);
  font-size: var(--fs-note);
  letter-spacing: .04em;
  color: var(--amber);
}

.page-about .about-net__meta .num {
  font-size: 17px;
  font-weight: 700;
}

.page-about .about-net__meta .num-unit {
  margin-right: 8px;
  font-size: var(--fs-micro);
  color: var(--stone);
}

/* ---------- 质量与资质 ---------- */
.page-about .about-quality__head {
  max-width: 760px;
  margin-bottom: clamp(22px, 3.2vw, 34px);
}

.page-about .about-quality__list {
  display: grid;
  gap: 1px;
  margin: 0 0 clamp(22px, 3.2vw, 32px);
  padding: 0;
  border: 1px solid var(--line-hair);
  border-radius: var(--r);
  background: var(--line-hair);
  list-style: none;
  overflow: hidden;
}

.page-about .about-quality__item {
  padding: 20px 20px 22px;
  background: rgba(14, 27, 58, .7);
}

.page-about .about-quality__no {
  margin: 0 0 8px;
  font-family: var(--font-num);
  font-size: var(--fs-micro);
  letter-spacing: .22em;
  color: var(--mint);
}

.page-about .about-quality__item h3 {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: var(--fs-h4);
  font-weight: 800;
  color: var(--on-dark);
}

.page-about .about-quality__item p:last-child {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--on-dark-dim);
}

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

.page-about .about-cred {
  padding: 18px 20px 20px;
  border-top: 2px solid var(--line);
  background: linear-gradient(180deg, rgba(53, 224, 210, .08), rgba(53, 224, 210, 0) 68%);
}

.page-about .about-cred h3 {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: 16px;
  font-weight: 800;
  line-height: 1.5;
  letter-spacing: -.005em;
  color: var(--on-dark);
}

.page-about .about-cred p {
  margin: 0;
  font-size: var(--fs-note);
  line-height: 1.75;
  color: var(--on-dark-dim);
}

/* ---------- 渠道合作 ---------- */
.page-about .about-partners__grid {
  display: grid;
  gap: clamp(20px, 3vw, 38px);
}

.page-about .about-partners__rail p:last-child {
  margin: 0;
  font-size: 15px;
  line-height: 1.82;
  color: var(--on-dark-dim);
}

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

.page-about .about-partners__list li {
  padding: 16px 18px 18px;
  border: 1px solid var(--about-card-line);
  border-radius: var(--r);
  background: rgba(23, 41, 90, .5);
  transition: border-color var(--dur) ease, transform var(--dur) ease;
}

.page-about .about-partners__list li:hover {
  border-color: rgba(53, 224, 210, .38);
  transform: translateX(3px);
}

.page-about .about-partners__list h3 {
  margin: 0 0 6px;
  font-family: var(--font-head);
  font-size: 16px;
  font-weight: 800;
  color: var(--on-dark);
}

.page-about .about-partners__list p {
  margin: 0;
  font-size: 15px;
  line-height: 1.76;
  color: var(--on-dark-dim);
}

.page-about .about-partners__note {
  grid-column: 1 / -1;
  margin: 0;
  font-size: var(--fs-note);
  line-height: 1.75;
  color: var(--stone);
}

.page-about .about-partners__note a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 合作节奏 ---------- */
.page-about .about-rhythm__head {
  max-width: 780px;
  margin-bottom: clamp(22px, 3.2vw, 34px);
}

.page-about .about-steps {
  display: grid;
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-steps__item {
  position: relative;
  padding: 20px 18px 22px;
  border: 1px solid var(--about-card-line);
  border-radius: var(--r);
  background: rgba(14, 27, 58, .58);
}

.page-about .about-steps__item::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 34px;
  height: 2px;
  background: var(--amber);
}

.page-about .about-steps__no {
  margin: 0 0 8px;
  font-family: var(--font-num);
  font-size: var(--fs-micro);
  letter-spacing: .18em;
  color: var(--amber);
}

.page-about .about-steps__item h3 {
  margin: 0 0 7px;
  font-family: var(--font-head);
  font-size: 16px;
  font-weight: 800;
  color: var(--on-dark);
}

.page-about .about-steps__item p:last-child {
  margin: 0;
  font-size: 15px;
  line-height: 1.74;
  color: var(--on-dark-dim);
}

/* ---------- 延伸阅读 ---------- */
.page-about .about-next {
  padding-bottom: clamp(40px, 6vw, 84px);
}

.page-about .about-next__title {
  margin: 0 0 18px;
  font-family: var(--font-head);
  font-size: clamp(20px, 2.8vw, var(--fs-h3));
  font-weight: 800;
  letter-spacing: -.01em;
  color: var(--on-dark);
}

.page-about .about-next__list {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-next__list a {
  display: block;
  padding: 18px 20px 20px;
  border: 1px solid var(--about-card-line);
  border-radius: var(--r);
  background: linear-gradient(180deg, rgba(23, 41, 90, .88), rgba(23, 41, 90, .42));
  text-decoration: none;
  transition: border-color var(--dur) ease, transform var(--dur) ease;
}

.page-about .about-next__list a:hover,
.page-about .about-next__list a:focus-visible {
  border-color: var(--cyan);
  transform: translateY(-3px);
}

.page-about .about-next__k {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-head);
  font-size: 17px;
  font-weight: 800;
  color: var(--on-dark);
}

.page-about .about-next__d {
  display: block;
  font-size: var(--fs-note);
  line-height: 1.72;
  color: var(--on-dark-dim);
}

/* ---------- 断点 ---------- */
@media (min-width: 720px) {
  .page-about .about-audience__list,
  .page-about .about-quality__list,
  .page-about .about-quality__creds,
  .page-about .about-next__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, .88fr);
    gap: clamp(32px, 5vw, 76px);
  }

  .page-about .about-history__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 330px);
    align-items: start;
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, .84fr) minmax(0, 1.16fr);
    align-items: start;
  }

  .page-about .about-net {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, .88fr);
    align-items: start;
  }

  .page-about .about-partners__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.16fr);
    align-items: start;
  }
}

@media (min-width: 960px) {
  .page-about .about-band__grid {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: var(--about-gap);
  }
}

@media (min-width: 1080px) {
  .page-about .about-steps {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-card,
  .page-about .about-role,
  .page-about .about-partners__list li,
  .page-about .about-next__list a,
  .page-about .about-track__item::before,
  .page-about .about-net__panel {
    transition: none;
    animation: none;
  }
}