.page-about {
  --about-copy-max: 62ch;
  --about-divider: rgba(79, 227, 193, 0.18);
  --about-panel: rgba(20, 69, 58, 0.42);
  --about-bar-h: 10px;
}

.page-about .about-hero {
  padding: clamp(28px, 6vw, 56px) 0 clamp(48px, 8vw, 96px);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 5vw, 48px);
  margin-top: clamp(24px, 4vw, 40px);
}

.page-about .about-hero__copy .eyebrow {
  margin-bottom: 14px;
}

.page-about .about-hero__copy .display-2 {
  margin: 0 0 22px;
}

.page-about .about-hero__copy .lead {
  margin: 0;
}

.page-about .about-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
  margin-top: 28px;
  padding-top: 20px;
  border-top: 1px solid var(--about-divider);
  color: var(--cool);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.page-about .about-hero__board {
  position: relative;
  min-height: 320px;
  border: 1px solid var(--about-divider);
  border-radius: var(--radius);
  background:
    radial-gradient(circle at 30% 30%, rgba(79, 227, 193, 0.14), transparent 60%),
    radial-gradient(circle at 75% 70%, rgba(255, 122, 47, 0.08), transparent 55%),
    linear-gradient(150deg, #06231C 0%, #0B3227 100%);
  overflow: hidden;
}

.page-about .about-hero__board::before {
  content: "";
  position: absolute;
  inset: -6%;
  background-image:
    linear-gradient(rgba(79, 227, 193, 0.14) 1px, transparent 1px),
    linear-gradient(90deg, rgba(79, 227, 193, 0.14) 1px, transparent 1px);
  background-size: 42px 42px;
  transform: rotate(-6deg);
}

.page-about .about-hero__board::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 180px;
  height: 180px;
  border-radius: 50%;
  border: 1.5px solid rgba(79, 227, 193, 0.42);
  box-shadow: 0 0 0 60px rgba(79, 227, 193, 0.06);
  transform: translate(-50%, -50%);
}

.page-about .about-hero__board-inner {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 12px;
  z-index: 1;
}

.page-about .about-hero__board-num {
  font-size: clamp(48px, 10vw, 76px);
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
  letter-spacing: -0.03em;
}

.page-about .about-hero__board-label {
  color: var(--cool);
}

.page-about .about-section {
  padding: clamp(48px, 8vw, 96px) 0;
}

.page-about .about-section__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 48px);
}

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

.page-about .about-section__head--full {
  margin-bottom: clamp(28px, 5vw, 48px);
}

.page-about .about-section__head .chapter-num {
  color: var(--cyan);
}

.page-about .about-section__body {
  max-width: var(--about-copy-max);
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.page-about .about-section__body p {
  margin: 0;
  color: var(--warm);
}

/* 时间轴 */
.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
  border-left: 1.5px solid var(--about-divider);
  padding-left: clamp(20px, 4vw, 36px);
}

.page-about .about-timeline__item {
  position: relative;
  padding-bottom: clamp(28px, 4vw, 48px);
}

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

.page-about .about-timeline__year {
  display: block;
  color: var(--cool);
  font-size: 12px;
  letter-spacing: 0.18em;
  margin-bottom: 8px;
}

.page-about .about-timeline__dot {
  position: absolute;
  left: calc(-1 * clamp(20px, 4vw, 36px) - 7px);
  top: 4px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  border: 2px solid var(--cyan);
  background: var(--ink);
}

.page-about .about-timeline__item--current .about-timeline__dot {
  background: var(--cyan);
  box-shadow: 0 0 0 5px rgba(79, 227, 193, 0.18);
}

.page-about .about-timeline__body {
  border-top: 1px solid var(--about-divider);
  padding-top: 14px;
}

.page-about .about-timeline__body[open] .about-timeline__summary {
  color: var(--cyan);
}

.page-about .about-timeline__summary {
  list-style: none;
  cursor: pointer;
  color: var(--warm);
  padding-right: 22px;
  position: relative;
}

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

.page-about .about-timeline__summary::after {
  content: "+";
  position: absolute;
  right: 0;
  top: 0;
  font-family: var(--font-mono);
  font-size: 16px;
  color: var(--cool);
}

.page-about .about-timeline__body[open] .about-timeline__summary::after {
  content: "−";
  color: var(--cyan);
}

.page-about .about-timeline__body p {
  margin: 12px 0 0;
  color: var(--cool);
  max-width: var(--about-copy-max);
}

/* 团队 */
.page-about .about-team__media {
  margin: 0 0 clamp(28px, 4vw, 44px);
}

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

.page-about .about-team-bar__head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 10px;
}

.page-about .about-team-bar__label {
  color: var(--warm);
  font-weight: 600;
}

.page-about .about-team-bar__num {
  color: var(--cyan);
  font-size: 15px;
}

.page-about .about-team-bar__track {
  display: block;
  height: var(--about-bar-h);
  border-radius: 999px;
  background: rgba(79, 227, 193, 0.1);
  overflow: hidden;
}

.page-about .about-team-bar__fill {
  display: block;
  height: 100%;
  width: var(--w, 0%);
  border-radius: 999px;
  transform-origin: left center;
  animation: about-bar-grow 900ms var(--ease) both;
}

.page-about .about-team-bar__fill--ops {
  background: linear-gradient(90deg, #4FE3C1, #3AA98F);
}

.page-about .about-team-bar__fill--dev {
  background: linear-gradient(90deg, #7DEBD1, #4FE3C1);
}

.page-about .about-team-bar__fill--cs {
  background: linear-gradient(90deg, #FFC49B, #FF7A2F);
}

.page-about .about-team-bar__desc {
  margin: 10px 0 0;
  color: var(--cool);
  font-size: 15px;
  max-width: var(--about-copy-max);
}

@keyframes about-bar-grow {
  from { transform: scaleX(0); }
  to { transform: scaleX(1); }
}

/* 数据链路 */
.page-about .about-section__grid--flow {
  align-items: start;
}

.page-about .about-flow__media {
  margin: 24px 0 0;
}

.page-about .about-flow {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 22px;
}

.page-about .about-flow__step {
  position: relative;
  padding: 22px 22px 22px 22px;
  border-left: 2px solid var(--cyan);
  background: var(--about-panel);
  border-radius: 0 var(--radius) var(--radius) 0;
  backdrop-filter: blur(6px);
}

.page-about .about-flow__index {
  display: inline-block;
  color: var(--cyan);
  font-size: 12px;
  letter-spacing: 0.2em;
  margin-bottom: 8px;
}

.page-about .about-flow__step h3 {
  margin: 0 0 8px;
  color: var(--warm);
}

.page-about .about-flow__step p {
  margin: 0;
  color: var(--cool);
}

/* 服务区域 */
.page-about .about-section__grid--region {
  align-items: center;
}

.page-about .about-region__lead {
  margin: 0 0 22px;
  color: var(--warm);
  max-width: var(--about-copy-max);
}

.page-about .about-region-bar {
  display: grid;
  grid-template-columns: 110px 1fr 52px;
  align-items: center;
  gap: 14px;
  padding: 12px 0;
  border-top: 1px solid var(--about-divider);
}

.page-about .about-region-bar:last-child {
  border-bottom: 1px solid var(--about-divider);
}

.page-about .about-region-bar__label {
  color: var(--warm);
  font-size: 15px;
}

.page-about .about-region-bar__track {
  display: block;
  height: var(--about-bar-h);
  border-radius: 999px;
  background: rgba(79, 227, 193, 0.1);
  overflow: hidden;
}

.page-about .about-region-bar__fill {
  display: block;
  height: 100%;
  width: var(--w, 0%);
  border-radius: 999px;
  background: linear-gradient(90deg, #4FE3C1, #2FB79A);
  transform-origin: left center;
  animation: about-bar-grow 900ms var(--ease) both;
}

.page-about .about-region-bar__fill--cool {
  background: linear-gradient(90deg, rgba(159, 179, 173, 0.8), rgba(159, 179, 173, 0.4));
}

.page-about .about-region-bar__num {
  color: var(--cyan);
  font-size: 15px;
  text-align: right;
}

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

/* 合作生态 */
.page-about .about-partners__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about .about-partners__item {
  display: grid;
  grid-template-columns: 64px 1fr;
  gap: 18px;
  align-items: start;
  padding: clamp(22px, 4vw, 34px) 0;
  border-top: 1px solid var(--about-divider);
}

.page-about .about-partners__item:last-child {
  border-bottom: 1px solid var(--about-divider);
}

.page-about .about-partners__num {
  font-size: clamp(34px, 5vw, 46px);
  font-weight: 700;
  line-height: 1;
  color: var(--orange);
  letter-spacing: -0.03em;
}

.page-about .about-partners__body h3 {
  margin: 0 0 10px;
  color: var(--warm);
}

.page-about .about-partners__body p {
  margin: 0;
  color: var(--cool);
  max-width: var(--about-copy-max);
}

/* 接下来的方向 */
.page-about .about-next__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 24px;
  counter-reset: next;
}

.page-about .about-next__item {
  position: relative;
  padding: 22px 0 22px 68px;
  border-top: 1px solid var(--about-divider);
}

.page-about .about-next__item:last-child {
  border-bottom: 1px solid var(--about-divider);
}

.page-about .about-next__item::before {
  counter-increment: next;
  content: "0" counter(next);
  position: absolute;
  left: 0;
  top: 24px;
  font-family: var(--font-mono);
  font-size: 22px;
  color: var(--cyan);
  letter-spacing: 0.06em;
}

.page-about .about-next__item h3 {
  margin: 0 0 8px;
  color: var(--warm);
}

.page-about .about-next__item p {
  margin: 0;
  color: var(--cool);
  max-width: var(--about-copy-max);
}

.page-about .about-next__cta {
  margin: clamp(28px, 4vw, 40px) 0 0;
  padding: 20px 22px;
  background: var(--about-panel);
  border-left: 2px solid var(--orange);
  border-radius: 0 var(--radius) var(--radius) 0;
  color: var(--warm);
}

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

.page-about .about-next__cta a:hover {
  color: var(--warm);
}

/* 响应式 */
@media (min-width: 760px) {
  .page-about .about-hero__grid {
    grid-template-columns: 1.1fr 0.9fr;
    align-items: center;
  }
  .page-about .about-section__grid {
    grid-template-columns: 0.42fr 0.58fr;
  }
  .page-about .about-section__grid--flow {
    grid-template-columns: 0.55fr 0.45fr;
    gap: clamp(36px, 5vw, 64px);
  }
  .page-about .about-section__grid--region {
    grid-template-columns: 0.5fr 0.5fr;
    gap: clamp(32px, 5vw, 60px);
  }
  .page-about .about-team__bars {
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
  }
}

@media (min-width: 1000px) {
  .page-about .about-section__grid {
    grid-template-columns: 0.38fr 0.62fr;
    gap: clamp(48px, 6vw, 88px);
  }
  .page-about .about-partners__item {
    grid-template-columns: 96px 1fr;
    gap: 28px;
  }
}

@media (max-width: 420px) {
  .page-about .about-region-bar {
    grid-template-columns: 1fr;
    gap: 6px;
  }
  .page-about .about-region-bar__num {
    text-align: left;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-team-bar__fill,
  .page-about .about-region-bar__fill {
    animation: none;
  }
}

.page-about {
  --w: 1rem;
}