.page-about {
  --about-rail: rgba(63, 224, 255, 0.5);
  --about-rail-soft: rgba(123, 92, 255, 0.34);
  --about-card: linear-gradient(158deg, rgba(30, 39, 80, 0.68), rgba(11, 18, 38, 0.9));
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: calc(var(--header-h) + clamp(52px, 8vw, 96px)) 0 clamp(44px, 6vw, 76px);
}

.page-about .about-hero__glow {
  position: absolute;
  inset: -18% -8% auto -8%;
  height: 660px;
  pointer-events: none;
  background:
    radial-gradient(56% 68% at 20% 26%, rgba(123, 92, 255, 0.32), transparent 68%),
    radial-gradient(44% 58% at 84% 10%, rgba(63, 224, 255, 0.18), transparent 70%);
}

.page-about .about-hero__grid {
  position: relative;
  display: grid;
  gap: clamp(32px, 5vw, 56px);
  align-items: end;
}

@media (min-width: 960px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.4fr) minmax(268px, 0.74fr);
    gap: clamp(44px, 5vw, 76px);
  }
}

.page-about .about-hero__lead {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.page-about .about-hero__lead h1 {
  margin: 0;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 6px;
}

.page-about .about-board {
  position: relative;
  padding: 26px 26px 34px;
  background: linear-gradient(158deg, rgba(30, 39, 80, 0.94), rgba(11, 18, 38, 0.92));
  box-shadow: var(--shadow-lift);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 28px), calc(100% - 28px) 100%, 0 100%);
}

.page-about .about-board::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  border-top: 1px solid rgba(63, 224, 255, 0.34);
  border-left: 1px solid var(--glass-border);
}

.page-about .about-board__title {
  margin: 0 0 20px;
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--text-soft);
}

.page-about .about-board__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 16px;
}

.page-about .about-board__item {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding-bottom: 15px;
  border-bottom: 1px solid var(--line-soft);
}

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

.page-about .about-board__num {
  flex: 0 0 auto;
  min-width: 4.4ch;
  font-size: clamp(25px, 3.2vw, 33px);
  line-height: 1.05;
  color: var(--cyan);
}

.page-about .about-board__desc {
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--text-soft);
}

/* ---------- 我们为谁做事 ---------- */
.page-about .about-serve__grid {
  display: grid;
  gap: clamp(28px, 4vw, 52px);
  align-items: center;
}

@media (min-width: 900px) {
  .page-about .about-serve__grid {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, 1fr);
  }
}

.page-about .about-serve__media {
  margin: 0;
  border-radius: var(--r-lg);
  overflow: hidden;
  border: 1px solid var(--line);
  box-shadow: var(--shadow-card);
  background: var(--ink-700);
}

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

.page-about .about-serve__body {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.page-about .about-serve__body h2 {
  margin: 0;
}

.page-about .about-serve__body p {
  margin: 0;
  max-width: 60ch;
  color: var(--text-soft);
  line-height: 1.78;
}

.page-about .about-serve__body p:first-of-type {
  color: var(--text);
}

.page-about .about-serve__list {
  margin: 6px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}

.page-about .about-serve__list li {
  position: relative;
  padding-left: 22px;
  font-size: 14.5px;
  color: var(--text);
  line-height: 1.6;
}

.page-about .about-serve__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 12px;
  height: 2px;
  border-radius: 2px;
  background: var(--gold);
}

/* ---------- 发展历程 ---------- */
.page-about .about-timeline {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  background: var(--ink-800);
}

.page-about .about-timeline__bg {
  position: absolute;
  inset: 0;
  z-index: -1;
  opacity: 0.26;
}

.page-about .about-timeline__bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .about-timeline__head {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.page-about .about-timeline__head h2 {
  margin: 0;
}

.page-about .about-timeline__list {
  position: relative;
  margin: clamp(32px, 5vw, 54px) 0 0;
  padding: 0 0 0 34px;
  list-style: none;
  display: grid;
  gap: 12px;
}

.page-about .about-timeline__list::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 14px;
  bottom: 14px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--about-rail), var(--about-rail-soft) 52%, rgba(63, 224, 255, 0.1));
}

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

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -34px;
  top: 28px;
  width: 10px;
  height: 10px;
  margin-left: 1px;
  transform: translateY(-50%);
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(63, 224, 255, 0.16);
}

.page-about .about-node__summary {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 16px;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: linear-gradient(120deg, rgba(21, 28, 59, 0.8), rgba(11, 18, 38, 0.62));
  transition: border-color 240ms var(--ease), background 240ms var(--ease);
}

.page-about .about-node__summary::-webkit-details-marker {
  display: none;
}

.page-about .about-node__summary:hover,
.page-about .about-node__summary:focus-visible {
  border-color: var(--line-strong);
}

.page-about .about-node[open] .about-node__summary {
  border-color: var(--line-strong);
  background: linear-gradient(120deg, rgba(30, 39, 80, 0.92), rgba(11, 18, 38, 0.78));
}

.page-about .about-node__year {
  font-size: 18px;
  color: var(--cyan);
  letter-spacing: 0.04em;
}

.page-about .about-node__title {
  font-size: 16px;
  font-weight: 700;
  color: var(--text);
  letter-spacing: 0.02em;
}

.page-about .about-node__hint {
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--text-soft);
  transition: transform 240ms var(--ease), color 240ms var(--ease);
}

.page-about .about-node[open] .about-node__hint {
  color: var(--gold);
}

.page-about .about-node__body {
  padding: 14px 18px 18px;
  border: 1px solid var(--line-soft);
  border-top: 0;
  border-radius: 0 0 var(--r-md) var(--r-md);
  margin-top: -6px;
  background: rgba(11, 18, 38, 0.6);
}

.page-about .about-node__body p {
  margin: 0;
  max-width: 62ch;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--text-soft);
}

/* ---------- 四支团队 ---------- */
.page-about .about-teams__head {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.page-about .about-teams__head h2 {
  margin: 0;
}

.page-about .about-teams__orbit {
  position: relative;
  margin-top: clamp(30px, 4vw, 48px);
  display: grid;
  gap: 18px;
}

@media (min-width: 880px) {
  .page-about .about-teams__orbit {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 20px;
    padding-top: 30px;
  }

  .page-about .about-teams__orbit::before {
    content: "";
    position: absolute;
    left: 3%;
    right: 3%;
    top: 0;
    height: 170px;
    border-top: 1px solid rgba(123, 92, 255, 0.42);
    border-radius: 50% 50% 0 0 / 100% 100% 0 0;
    pointer-events: none;
  }

  .page-about .about-team:nth-child(1) { margin-top: 0; }
  .page-about .about-team:nth-child(2) { margin-top: 54px; }
  .page-about .about-team:nth-child(3) { margin-top: 18px; }
  .page-about .about-team:nth-child(4) { margin-top: 70px; }
}

.page-about .about-team {
  position: relative;
  padding: 22px 20px 24px;
  border-radius: var(--r-lg);
  border: 1px solid var(--line);
  background: var(--about-card);
  box-shadow: var(--shadow-card);
  transition: transform 260ms var(--ease), border-color 260ms var(--ease);
}

.page-about .about-team:hover,
.page-about .about-team:focus-within {
  transform: translateY(-6px);
  border-color: var(--line-strong);
}

.page-about .about-team__count {
  font-size: clamp(30px, 3.6vw, 40px);
  line-height: 1;
  margin: 0 0 14px;
  color: var(--cyan);
}

.page-about .about-team__name {
  margin: 0 0 10px;
  font-size: 16.5px;
  font-weight: 800;
  letter-spacing: 0.03em;
  color: var(--text);
}

.page-about .about-team__desc {
  margin: 0 0 16px;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--text-soft);
}

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

/* ---------- 数据旅程 ---------- */
.page-about .about-process__grid {
  display: grid;
  gap: clamp(28px, 4vw, 56px);
  align-items: start;
}

@media (min-width: 940px) {
  .page-about .about-process__grid {
    grid-template-columns: minmax(0, 1.3fr) minmax(250px, 0.7fr);
  }
}

.page-about .about-process__body h2 {
  margin: 14px 0 0;
}

.page-about .about-process__steps {
  margin: clamp(28px, 4vw, 42px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-step {
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr);
  gap: 18px;
  padding: 20px 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-step:last-child {
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-step__idx {
  position: relative;
  padding-left: 14px;
  font-size: 14px;
  color: var(--cyan);
  line-height: 1.6;
}

.page-about .about-step__idx::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.42em;
  width: 2px;
  height: 24px;
  border-radius: 2px;
  background: var(--cyan);
  opacity: 0.55;
}

.page-about .about-step__text h3 {
  margin: 0 0 8px;
  font-size: 16px;
  font-weight: 800;
  letter-spacing: 0.03em;
  color: var(--text);
}

.page-about .about-step__text p {
  margin: 0;
  max-width: 58ch;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--text-soft);
}

.page-about .about-process__media {
  margin: 0;
  border-radius: var(--r-lg);
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--ink-700);
  box-shadow: var(--shadow-card);
}

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

/* ---------- 服务标准与合作生态 ---------- */
.page-about .about-standard__head h2 {
  margin: 14px 0 0;
}

.page-about .about-standard__grid {
  margin-top: clamp(28px, 4vw, 44px);
  display: grid;
  gap: 20px;
}

@media (min-width: 840px) {
  .page-about .about-standard__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 24px;
  }
}

.page-about .about-std-card {
  padding: 26px 24px 28px;
  border-radius: var(--r-lg);
  border: 1px solid var(--line);
  background: var(--about-card);
  box-shadow: var(--shadow-card);
}

.page-about .about-std-card--cyan {
  border-top: 2px solid var(--cyan);
}

.page-about .about-std-card--violet {
  border-top: 2px solid var(--violet);
}

.page-about .about-std-card__title {
  margin: 0 0 18px;
  font-size: 17px;
  font-weight: 800;
  letter-spacing: 0.04em;
  color: var(--text);
}

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

.page-about .about-std-card__list li {
  position: relative;
  padding-left: 20px;
  font-size: 14px;
  line-height: 1.78;
  color: var(--text-soft);
}

.page-about .about-std-card__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.75em;
  width: 8px;
  height: 1px;
  background: var(--gray);
}

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

.page-about .about-std-card__list a:hover {
  color: var(--gold);
}

/* ---------- 这些年积累下来的数字 ---------- */
.page-about .about-marks {
  background: linear-gradient(180deg, transparent, rgba(21, 28, 59, 0.42) 40%, transparent);
}

.page-about .about-marks__head h2 {
  margin: 14px 0 0;
}

.page-about .about-marks__grid {
  margin-top: clamp(30px, 4vw, 48px);
  display: grid;
  gap: 28px;
}

@media (min-width: 860px) {
  .page-about .about-marks__grid {
    grid-template-columns: minmax(0, 0.82fr) minmax(0, 1.18fr);
    gap: 56px;
    align-items: center;
  }
}

.page-about .about-marks__hero {
  padding: 28px 26px 30px;
  border-radius: var(--r-lg);
  border: 1px solid var(--line-soft);
  background: linear-gradient(150deg, rgba(123, 92, 255, 0.16), rgba(5, 7, 15, 0.5));
}

.page-about .about-marks__big {
  margin: 0;
  font-size: clamp(42px, 7vw, 72px);
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-marks__caption {
  margin: 14px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-soft);
  max-width: 30ch;
}

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

.page-about .about-mark {
  display: flex;
  align-items: baseline;
  gap: 18px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-mark:first-child {
  border-top: 1px solid var(--line-soft);
}

.page-about .about-mark__num {
  flex: 0 0 auto;
  min-width: 5.5ch;
  font-size: clamp(22px, 2.6vw, 28px);
  line-height: 1.1;
  color: var(--white);
}

.page-about .about-mark__label {
  font-size: 14px;
  line-height: 1.72;
  color: var(--text-soft);
}

.page-about .about-marks__tail {
  margin: clamp(26px, 3.4vw, 40px) 0 0;
  max-width: 66ch;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--text-soft);
}

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

.page-about .about-marks__tail a:hover {
  color: var(--gold);
}

/* ---------- 本页索引 ---------- */
.page-about .about-index__list {
  margin-top: 18px;
}

.page-about .about-index__list a {
  color: var(--text);
}

.page-about .about-index__list a:hover {
  color: var(--cyan);
}

/* ---------- 窄屏收敛 ---------- */
@media (max-width: 620px) {
  .page-about .about-board {
    padding: 22px 20px 30px;
    clip-path: polygon(0 0, 100% 0, 100% calc(100% - 20px), calc(100% - 20px) 100%, 0 100%);
  }

  .page-about .about-node__summary {
    grid-template-columns: minmax(0, 1fr) auto;
    row-gap: 6px;
    padding: 14px 15px;
  }

  .page-about .about-node__year {
    grid-column: 1 / -1;
  }

  .page-about .about-step {
    grid-template-columns: 40px minmax(0, 1fr);
    gap: 14px;
  }

  .page-about .about-mark {
    flex-direction: column;
    gap: 6px;
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .about-team,
  .page-about .about-node__summary,
  .page-about .about-node__hint {
    transition: none;
  }

  .page-about .about-team:hover,
  .page-about .about-team:focus-within {
    transform: none;
  }
}