.page-about {
  --about-gap: clamp(20px, 4vw, 44px);
  --about-body: rgba(245, 240, 228, 0.8);
  --about-shadow: 12px 12px 0 rgba(4, 14, 24, 0.55);
  color: var(--paper);
  background:
    radial-gradient(circle at 84% -8%, rgba(47, 111, 159, 0.3), transparent 52%),
    var(--sea-900);
  padding-bottom: clamp(48px, 8vw, 96px);
  overflow-x: clip;
}

.page-about .breadcrumb {
  padding-top: clamp(16px, 3vw, 26px);
  font-size: 13px;
}

.page-about .about-kicker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 14px;
  font-family: var(--font-num);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--mint);
}

.page-about .about-kicker::before {
  content: "";
  width: 22px;
  height: 1px;
  background: var(--mint);
  opacity: 0.7;
}

.page-about .about-kicker--dark {
  color: var(--sea-900);
}

.page-about .about-kicker--dark::before {
  background: var(--sea-900);
}

.page-about .about-head {
  margin-bottom: clamp(24px, 4vw, 40px);
}

.page-about .about-head h2 {
  margin: 0 0 14px;
  font-family: var(--font-head);
  font-weight: 800;
  letter-spacing: -0.01em;
  line-height: 1.18;
  font-size: clamp(26px, 4vw, 40px);
}

.page-about .about-lead {
  margin: 0;
  max-width: 62ch;
  color: var(--about-body);
  line-height: 1.78;
}

/* 首屏 */
.page-about .about-hero {
  display: grid;
  gap: var(--about-gap);
  padding-top: clamp(18px, 4vw, 40px);
}

.page-about .about-hero h1 {
  margin: 0 0 18px;
  font-family: var(--font-head);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.06;
  font-size: clamp(32px, 6.6vw, 62px);
}

.page-about .about-hero__intro {
  margin: 0 0 26px;
  max-width: 56ch;
  color: var(--about-body);
  font-size: clamp(16px, 1.6vw, 18px);
  line-height: 1.8;
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin: 0 0 26px;
  border-top: 1px dashed var(--line-strong);
}

.page-about .about-stats__item {
  padding: 16px 10px 0 0;
  border-right: 1px dashed var(--line);
}

.page-about .about-stats__item:last-child {
  padding-right: 0;
  border-right: 0;
}

.page-about .about-stats dt {
  margin-bottom: 6px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--mist);
}

.page-about .about-stats dd {
  margin: 0;
  font-family: var(--font-num);
  font-weight: 700;
  font-size: clamp(22px, 3.4vw, 34px);
  line-height: 1;
  color: var(--paper);
}

.page-about .about-stats small {
  margin-left: 4px;
  font-family: var(--font-body);
  font-size: 12px;
  font-weight: 400;
  color: var(--mist);
}

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

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

.page-about .about-hero__map img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--line-strong);
  background: var(--sea-800);
  box-shadow: var(--about-shadow);
}

.page-about .about-hero__map figcaption {
  margin-top: 14px;
  padding-left: 12px;
  border-left: 2px solid var(--coral);
  font-size: 13px;
  line-height: 1.65;
  color: var(--mist);
}

/* 品牌起点 */
.page-about .about-origin {
  display: grid;
  gap: var(--about-gap);
  padding-top: clamp(48px, 8vw, 92px);
}

.page-about .about-origin__quote {
  position: relative;
  padding: clamp(24px, 4vw, 36px);
  background: var(--paper);
  color: var(--ink);
  border: 1px solid var(--ink);
  box-shadow: 12px 12px 0 rgba(242, 107, 74, 0.32);
}

.page-about .about-quote__mark {
  margin: 0 0 6px;
  font-family: var(--font-head);
  font-size: 40px;
  line-height: 1;
  color: var(--coral-deep);
}

.page-about .about-origin__quote blockquote {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 800;
  letter-spacing: -0.01em;
  line-height: 1.28;
  font-size: clamp(23px, 3.4vw, 34px);
}

.page-about .about-mark {
  font-style: normal;
  text-decoration: underline wavy var(--coral-deep) 2px;
  text-underline-offset: 7px;
}

.page-about .about-quote__note {
  margin: 18px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: #3a4653;
}

.page-about .about-origin__text h2 {
  margin: 0 0 18px;
  font-family: var(--font-head);
  font-weight: 800;
  letter-spacing: -0.01em;
  line-height: 1.2;
  font-size: clamp(25px, 3.6vw, 38px);
}

.page-about .about-origin__text p {
  margin: 0 0 16px;
  max-width: 66ch;
  line-height: 1.8;
  color: var(--about-body);
}

.page-about .about-origin__text p:last-child {
  margin-bottom: 0;
}

/* 五步方法 */
.page-about .about-method {
  padding-top: clamp(48px, 8vw, 92px);
}

.page-about .about-method__grid {
  display: grid;
  gap: var(--about-gap);
}

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

.page-about .about-method__figure img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--line-strong);
  background: var(--sea-800);
}

.page-about .about-method__figure figcaption {
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--mist);
}

.page-about .accordion {
  border-top: 1px solid var(--line-strong);
}

.page-about .accordion__item {
  border-bottom: 1px solid var(--line-strong);
}

.page-about .accordion__trigger {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: baseline;
  gap: 16px;
  width: 100%;
  padding: 18px 4px;
  background: none;
  border: 0;
  color: var(--paper);
  font-family: var(--font-body);
  font-size: clamp(16px, 2vw, 19px);
  font-weight: 700;
  text-align: left;
  cursor: pointer;
  transition: color var(--dur) var(--ease);
}

.page-about .accordion__trigger:hover,
.page-about .accordion__trigger:focus-visible {
  color: var(--mint);
}

.page-about .step-num {
  font-family: var(--font-num);
  font-size: clamp(20px, 2.6vw, 28px);
  font-weight: 700;
  line-height: 1;
  color: var(--sea-500);
  transition: color var(--dur) var(--ease);
}

.page-about .accordion__trigger[aria-expanded="true"] .step-num {
  color: var(--mint);
}

.page-about .accordion__sign {
  font-family: var(--font-num);
  font-size: 20px;
  line-height: 1;
  color: var(--mist);
}

.page-about .accordion__body {
  padding: 0 0 22px;
}

.page-about .accordion__body p {
  margin: 0 0 12px;
  max-width: 62ch;
  line-height: 1.8;
  color: var(--about-body);
  font-size: 15px;
}

.page-about .accordion__body p:last-child {
  margin-bottom: 0;
}

.page-about .about-get {
  color: var(--mint);
  font-weight: 700;
}

/* 时间线 */
.page-about .about-timeline {
  padding-top: clamp(48px, 8vw, 92px);
}

.page-about .timeline {
  display: grid;
  gap: 22px;
}

.page-about .timeline__rail {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 6px;
}

.page-about .timeline__year {
  flex: 0 0 auto;
  padding: 6px 12px;
  border: 1px dashed var(--line-strong);
  border-radius: var(--radius);
  font-family: var(--font-num);
  font-size: 14px;
  font-weight: 700;
  color: var(--mist);
  text-decoration: none;
  transition: color var(--dur) var(--ease), background var(--dur) var(--ease),
    border-color var(--dur) var(--ease);
}

.page-about .timeline__year:hover,
.page-about .timeline__year:focus-visible {
  color: var(--sea-900);
  background: var(--mint);
  border-color: var(--mint);
}

.page-about .timeline__body {
  list-style: none;
  margin: 0;
  padding: 0 0 0 24px;
  border-left: 1px dashed var(--line-strong);
  display: grid;
  gap: 28px;
}

.page-about .timeline__item {
  position: relative;
  scroll-margin-top: 96px;
}

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: -29px;
  top: 5px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--sea-500);
  border: 2px solid var(--sea-900);
}

.page-about .timeline__stamp {
  margin: 0 0 6px;
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--coral);
}

.page-about .timeline__item h3 {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(18px, 2.2vw, 22px);
  line-height: 1.35;
  color: var(--paper);
}

.page-about .timeline__item p {
  margin: 0;
  max-width: 64ch;
  line-height: 1.78;
  color: var(--about-body);
  font-size: 15px;
}

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

/* 团队 */
.page-about .about-team {
  padding-top: clamp(48px, 8vw, 92px);
}

.page-about .about-team__grid {
  display: grid;
  gap: var(--about-gap);
}

.page-about .about-team__intro h2 {
  margin: 0 0 16px;
  font-family: var(--font-head);
  font-weight: 800;
  letter-spacing: -0.01em;
  line-height: 1.2;
  font-size: clamp(25px, 3.6vw, 38px);
}

.page-about .about-team__intro p {
  margin: 0 0 14px;
  max-width: 58ch;
  line-height: 1.8;
  color: var(--about-body);
  font-size: 15px;
}

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

.page-about .role-card {
  padding: 18px 18px 20px;
  background: var(--sea-800);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .role-card:hover {
  transform: translateY(-4px);
  border-color: var(--mint);
}

.page-about .role-card__tag {
  display: inline-block;
  margin-bottom: 10px;
  padding: 2px 8px;
  background: var(--mint);
  color: var(--sea-900);
  font-family: var(--font-num);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.1em;
}

.page-about .role-card:nth-child(2) .role-card__tag {
  background: var(--coral);
}

.page-about .role-card:nth-child(3) .role-card__tag {
  background: var(--paper);
}

.page-about .role-card:nth-child(5) .role-card__tag {
  background: var(--sea-500);
  color: var(--paper);
}

.page-about .role-card h3 {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 16px;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .role-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--about-body);
}

/* 服务网络 */
.page-about .about-network {
  padding-top: clamp(48px, 8vw, 92px);
}

.page-about .net {
  display: grid;
  gap: var(--about-gap);
}

.page-about .net__map {
  padding: 12px;
  background: var(--sea-800);
  border: 1px solid var(--line-strong);
}

.page-about .net__svg {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .net__grid-line {
  fill: none;
  stroke: rgba(143, 163, 181, 0.16);
  stroke-width: 1;
}

.page-about .net__route {
  fill: none;
  stroke: var(--coral);
  stroke-width: 2;
  stroke-dasharray: 6 6;
  opacity: 0.85;
}

.page-about .net__dot {
  fill: var(--sea-500);
  transform-box: fill-box;
  transform-origin: center;
  transition: fill var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .net__dot--key {
  fill: var(--mint);
}

.page-about .net__dot--hub {
  fill: var(--coral);
}

.page-about .net__map:hover .net__dot {
  fill: var(--paper);
}

.page-about .net__dot:hover {
  fill: var(--mint);
  transform: scale(1.8);
}

.page-about .net__label {
  fill: var(--paper);
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 700;
}

.page-about .net__label-sub {
  fill: var(--mist);
  font-family: var(--font-body);
  font-size: 11px;
}

.page-about .net__list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line-strong);
}

.page-about .net__item {
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}

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

.page-about .net__item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--about-body);
}

.page-about .net__figure {
  margin: var(--about-gap) 0 0;
}

.page-about .net__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1000 / 420;
  object-fit: cover;
  border: 1px solid var(--line-strong);
  background: var(--sea-800);
}

.page-about .net__figure figcaption {
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--mist);
}

.page-about .net__partners {
  margin-top: var(--about-gap);
  padding: 20px 20px 22px;
  background: var(--sea-800);
  border-left: 3px solid var(--coral);
}

.page-about .net__partners h3 {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 18px;
  color: var(--paper);
}

.page-about .net__partners p {
  margin: 0;
  max-width: 70ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--about-body);
}

/* 资质 */
.page-about .about-cert {
  padding-top: clamp(48px, 8vw, 92px);
}

.page-about .cert-grid {
  display: grid;
  gap: 26px;
}

.page-about .cert-card {
  padding: 20px 20px 22px;
  background: var(--paper);
  color: var(--ink);
  border: 1px solid var(--ink);
  box-shadow: 12px 12px 0 rgba(4, 14, 24, 0.55);
}

.page-about .cert-card__num {
  display: block;
  margin-bottom: 4px;
  font-family: var(--font-num);
  font-weight: 700;
  font-size: clamp(26px, 3vw, 34px);
  line-height: 1;
  color: var(--coral-deep);
}

.page-about .cert-card h3 {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 16px;
  line-height: 1.45;
}

.page-about .cert-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: #3a4653;
}

/* 出口 */
.page-about .about-exit {
  padding-top: clamp(48px, 8vw, 96px);
}

.page-about .about-exit__panel {
  position: relative;
  overflow: hidden;
  padding: clamp(24px, 4vw, 44px);
  background: var(--coral);
  color: var(--sea-900);
  border: 1px solid var(--coral-deep);
  box-shadow: 14px 14px 0 rgba(4, 14, 24, 0.5);
}

.page-about .about-exit__panel::after {
  content: "→";
  position: absolute;
  right: -8px;
  bottom: -50px;
  font-family: var(--font-head);
  font-size: 170px;
  line-height: 1;
  color: rgba(7, 26, 43, 0.12);
  pointer-events: none;
}

.page-about .about-exit__panel h2 {
  position: relative;
  margin: 0 0 14px;
  font-family: var(--font-head);
  font-weight: 800;
  letter-spacing: -0.01em;
  line-height: 1.16;
  font-size: clamp(25px, 3.8vw, 40px);
  color: var(--sea-900);
}

.page-about .about-exit__panel p {
  position: relative;
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.78;
  color: rgba(7, 26, 43, 0.86);
}

.page-about .about-exit__actions {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

.page-about .about-exit .btn--coral {
  background: var(--sea-900);
  border-color: var(--sea-900);
  color: var(--paper);
}

.page-about .about-exit .btn--ghost {
  background: transparent;
  border-color: rgba(7, 26, 43, 0.5);
  color: var(--sea-900);
}

.page-about .about-exit__links {
  position: relative;
  margin-top: 20px;
  font-size: 13px;
  line-height: 1.7;
  color: rgba(7, 26, 43, 0.78);
}

.page-about .about-exit__links a {
  color: var(--sea-900);
  font-weight: 700;
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* 响应式 */
@media (min-width: 640px) {
  .page-about .role-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .page-about .net__list {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 26px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }

  .page-about .about-origin {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: start;
  }

  .page-about .about-origin__quote {
    position: sticky;
    top: 96px;
  }

  .page-about .about-method__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: start;
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: start;
  }

  .page-about .net {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: start;
  }

  .page-about .timeline {
    grid-template-columns: minmax(0, 170px) minmax(0, 1fr);
    gap: 44px;
  }

  .page-about .timeline__rail {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    position: sticky;
    top: 96px;
    align-self: start;
    padding-bottom: 0;
  }

  .page-about .timeline__year {
    padding: 6px 0 6px 14px;
    border: 0;
    border-left: 2px solid transparent;
    border-radius: 0;
    font-size: clamp(17px, 1.8vw, 22px);
  }

  .page-about .timeline__year:hover,
  .page-about .timeline__year:focus-visible {
    background: transparent;
    color: var(--mint);
    border-left-color: var(--mint);
  }
}

@media (min-width: 1024px) {
  .page-about .cert-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .role-card,
  .page-about .net__dot,
  .page-about .timeline__year,
  .page-about .accordion__trigger {
    transition: none;
  }

  .page-about .role-card:hover {
    transform: none;
  }
}