.page-about {
  --about-hair: rgba(22, 32, 74, .92);
  --about-body: rgba(233, 241, 251, .86);
  --about-pad: clamp(56px, 8vw, 104px);
  padding-bottom: clamp(64px, 9vw, 120px);
}

.page-about .breadcrumb {
  padding-top: 24px;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  padding: clamp(28px, 5vw, 54px) 0 0;
}

.page-about .about-hero__inner {
  display: grid;
  gap: 20px;
}

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

.page-about .about-hero__title {
  margin: 0;
  font-size: clamp(2rem, 8.2vw, 4.1rem);
  line-height: 1.08;
  font-weight: 800;
  letter-spacing: .015em;
  color: var(--c-mist);
  background-image: linear-gradient(104deg, var(--c-mist) 24%, var(--c-cyan) 76%, var(--c-magenta) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.page-about .about-hero__lede {
  margin: 0;
  font-size: clamp(15.5px, 1.9vw, 17px);
  line-height: 1.85;
  color: var(--about-body);
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px 24px;
  margin: 14px 0 0;
  padding: 24px 0 0;
  border-top: 1px solid var(--about-hair);
}

.page-about .about-hero__facts .fact {
  margin: 0;
  min-width: 0;
}

.page-about .about-hero__facts dt {
  margin: 0 0 8px;
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--c-muted);
}

.page-about .about-hero__facts dd {
  margin: 0;
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 6px;
}

.page-about .fact__num {
  font-size: clamp(1.6rem, 4.4vw, 2.4rem);
  line-height: 1;
  letter-spacing: .02em;
  color: var(--c-amber);
}

.page-about .fact__unit {
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--c-muted);
}

@media (min-width: 960px) {
  .page-about .about-hero__inner {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    column-gap: 24px;
    row-gap: 30px;
    align-items: end;
  }

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

  .page-about .about-hero__title {
    grid-column: 1 / 8;
  }

  .page-about .about-hero__lede {
    grid-column: 8 / -1;
    padding-bottom: 6px;
  }

  .page-about .about-hero__facts {
    grid-column: 1 / -1;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 24px;
    margin-top: 6px;
  }
}

/* ---------- 通栏影像 ---------- */

.page-about .about-banner {
  margin: clamp(40px, 7vw, 74px) 0 0;
}

.page-about .about-banner__frame {
  position: relative;
  overflow: hidden;
  border-radius: 6px;
  border: 1px solid var(--about-hair);
}

.page-about .about-banner__frame img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 2 / 1;
  object-fit: cover;
}

.page-about .about-banner__frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(114deg, rgba(34, 227, 211, .20), rgba(5, 10, 24, 0) 46%, rgba(255, 61, 139, .22));
}

.page-about .about-banner__caption {
  margin-top: 14px;
  font-size: 13px;
  line-height: 1.7;
  letter-spacing: .03em;
  color: var(--c-muted);
}

/* ---------- 通用章节 ---------- */

.page-about .about-section {
  padding-top: var(--about-pad);
}

.page-about .section-head h2,
.page-about .about-cols__head h2 {
  margin: 10px 0 0;
  font-size: clamp(1.5rem, 4.2vw, 2.4rem);
  line-height: 1.2;
  letter-spacing: .02em;
  color: var(--c-mist);
}

.page-about .section-head .lede {
  margin: 14px 0 0;
  max-width: 46em;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--about-body);
}

/* ---------- 理念 ---------- */

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

.page-about .about-cols__body p {
  margin: 0 0 1.2em;
  font-size: clamp(15.5px, 1.9vw, 17px);
  line-height: 1.85;
  color: var(--about-body);
  max-width: 42em;
}

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

@media (min-width: 900px) {
  .page-about .about-cols {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    column-gap: 24px;
    align-items: start;
  }

  .page-about .about-cols__head {
    grid-column: 1 / 6;
    position: sticky;
    top: 92px;
  }

  .page-about .about-cols__body {
    grid-column: 7 / -1;
  }
}

/* ---------- 四个区域 ---------- */

.page-about .zone-list {
  list-style: none;
  margin: clamp(32px, 5vw, 48px) 0 0;
  padding: 0;
  border-top: 1px solid var(--about-hair);
}

.page-about .zone {
  position: relative;
  display: grid;
  grid-template-columns: 56px minmax(0, 1fr);
  gap: 4px 16px;
  padding: 24px 0 24px 14px;
  border-bottom: 1px solid var(--about-hair);
}

.page-about .zone::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, var(--c-cyan), var(--c-magenta));
  transform: scaleY(0);
  transform-origin: center top;
  transition: transform var(--dur) var(--ease);
}

.page-about .zone:hover::after {
  transform: scaleY(1);
}

.page-about .zone__idx {
  font-size: clamp(22px, 3.4vw, 30px);
  line-height: 1.1;
  letter-spacing: .06em;
  color: rgba(34, 227, 211, .62);
}

.page-about .zone__body h3 {
  margin: 0 0 8px;
  font-size: clamp(18px, 2.4vw, 23px);
  letter-spacing: .02em;
  color: var(--c-mist);
}

.page-about .zone__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--about-body);
  max-width: 44em;
}

.page-about .zone__meta {
  grid-column: 2;
  align-self: start;
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--c-muted);
}

@media (min-width: 820px) {
  .page-about .zone {
    grid-template-columns: 76px minmax(0, 1fr) 160px;
    align-items: baseline;
    gap: 0 28px;
    padding: 30px 0 30px 18px;
  }

  .page-about .zone__meta {
    grid-column: 3;
    text-align: right;
  }
}

/* ---------- 会员层级 ---------- */

.page-about .tier-layout {
  display: grid;
  gap: 40px;
  margin-top: clamp(32px, 5vw, 48px);
}

.page-about .tier-stairs {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 18px;
}

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

.page-about .tier__plate {
  display: flex;
  align-items: center;
  width: 100%;
  min-height: 58px;
  padding: 12px 22px;
  border-radius: 4px;
  border: 1px solid var(--edge-cyan);
  background: linear-gradient(90deg, var(--glass-cyan), rgba(34, 227, 211, 0) 88%);
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .tier:hover .tier__plate {
  transform: translateX(3px);
  border-color: rgba(34, 227, 211, .5);
}

.page-about .tier:nth-child(3) .tier__plate {
  border-color: var(--edge-magenta);
  background: linear-gradient(90deg, var(--glass-magenta), rgba(255, 61, 139, 0) 88%);
}

.page-about .tier:nth-child(3):hover .tier__plate {
  border-color: rgba(255, 61, 139, .55);
}

.page-about .tier:nth-child(4) .tier__plate {
  border-color: rgba(34, 227, 211, .45);
  background: linear-gradient(90deg, var(--glass-cyan), var(--glass-magenta));
}

.page-about .tier__name {
  font-size: clamp(17px, 2.2vw, 21px);
  font-weight: 700;
  letter-spacing: .05em;
  color: var(--c-mist);
}

.page-about .tier__desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--about-body);
  max-width: 40em;
}

@media (min-width: 720px) {
  .page-about .tier:nth-child(1) .tier__plate {
    width: 54%;
  }

  .page-about .tier:nth-child(2) .tier__plate {
    width: 70%;
  }

  .page-about .tier:nth-child(3) .tier__plate {
    width: 86%;
  }

  .page-about .tier:nth-child(4) .tier__plate {
    width: 100%;
  }
}

.page-about .tier-figure {
  margin: 0;
}

.page-about .tier-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 4;
  object-fit: cover;
  border-radius: 6px;
  border: 1px solid var(--about-hair);
}

.page-about .tier-figure figcaption {
  margin-top: 14px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--c-muted);
}

@media (min-width: 1000px) {
  .page-about .tier-layout {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, .8fr);
    column-gap: 56px;
    align-items: start;
  }
}

/* ---------- 团队 ---------- */

.page-about .team-strip {
  display: flex;
  height: 64px;
  margin-top: clamp(32px, 5vw, 46px);
  border-radius: 4px;
  overflow: hidden;
  border: 1px solid var(--about-hair);
}

.page-about .team-strip__seg {
  height: 100%;
}

.page-about .team-strip__seg + .team-strip__seg {
  border-left: 1px solid rgba(5, 10, 24, .85);
}

.page-about .team-strip__seg--eng {
  flex: 37 1 0;
  background: linear-gradient(160deg, rgba(34, 227, 211, .78), rgba(14, 156, 147, .5));
}

.page-about .team-strip__seg--edit {
  flex: 23 1 0;
  background: linear-gradient(160deg, rgba(255, 61, 139, .72), rgba(179, 36, 106, .48));
}

.page-about .team-strip__seg--ops {
  flex: 40 1 0;
  background: linear-gradient(160deg, rgba(140, 155, 184, .34), rgba(22, 32, 74, .72));
}

.page-about .team-legend {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 20px;
}

.page-about .team-legend li {
  padding-top: 16px;
  border-top: 1px solid var(--about-hair);
}

.page-about .team-legend__head {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .dot {
  width: 10px;
  height: 10px;
  border-radius: 2px;
  flex: none;
  transform: translateY(-1px);
}

.page-about .dot--eng {
  background: var(--c-cyan);
}

.page-about .dot--edit {
  background: var(--c-magenta);
}

.page-about .dot--ops {
  background: rgba(140, 155, 184, .75);
}

.page-about .team-legend__name {
  font-size: 16px;
  font-weight: 700;
  letter-spacing: .03em;
  color: var(--c-mist);
}

.page-about .team-legend__num {
  font-size: 22px;
  line-height: 1;
  color: var(--c-amber);
}

.page-about .team-legend__unit {
  font-size: 13px;
  color: var(--c-muted);
}

.page-about .team-legend__desc {
  margin: 10px 0 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--about-body);
}

@media (min-width: 800px) {
  .page-about .team-legend {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 30px;
  }
}

/* ---------- 主题活动 ---------- */

.page-about .event-figure {
  margin: clamp(32px, 5vw, 46px) 0 0;
}

.page-about .event-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 12 / 7;
  object-fit: cover;
  border-radius: 6px;
  border: 1px solid var(--about-hair);
}

.page-about .event-figure figcaption {
  margin-top: 14px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--c-muted);
}

.page-about .event-grid {
  display: grid;
  gap: 18px;
  margin-top: 34px;
}

.page-about .event-card {
  padding: 24px 22px 26px;
}

.page-about .event-card h3 {
  margin: 14px 0 10px;
  font-size: 19px;
  line-height: 1.4;
  letter-spacing: .02em;
  color: var(--c-mist);
}

.page-about .event-card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--about-body);
}

@media (min-width: 820px) {
  .page-about .event-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }
}

/* ---------- 年度时间线 ---------- */

.page-about .timeline-layout {
  display: grid;
  gap: 44px;
  margin-top: clamp(32px, 5vw, 48px);
}

.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 26px;
  position: relative;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 10px;
  bottom: 12px;
  width: 1px;
  background: linear-gradient(180deg, var(--c-cyan), var(--c-magenta) 68%, rgba(255, 61, 139, 0));
}

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 34px;
}

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

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 7px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--c-ink);
  border: 1px solid var(--c-cyan);
  box-shadow: 0 0 0 3px rgba(34, 227, 211, .1);
}

.page-about .about-timeline__tag {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 12px;
  margin: 0 0 8px;
}

.page-about .about-timeline__year {
  font-size: 12.5px;
  letter-spacing: .14em;
  color: var(--c-muted);
}

.page-about .about-timeline__ver {
  font-size: 20px;
  line-height: 1;
  color: var(--c-magenta);
}

.page-about .about-timeline__item h3 {
  margin: 0 0 8px;
  font-size: clamp(17px, 2.2vw, 20px);
  line-height: 1.4;
  letter-spacing: .02em;
  color: var(--c-mist);
}

.page-about .about-timeline__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--about-body);
  max-width: 42em;
}

.page-about .about-figures {
  border-top: 1px solid var(--about-hair);
}

.page-about .figure-row {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: baseline;
  gap: 18px;
  padding: 18px 0;
  border-bottom: 1px solid var(--about-hair);
}

.page-about .figure-row__num {
  font-size: clamp(28px, 4.4vw, 40px);
  line-height: 1;
  color: var(--c-amber);
}

.page-about .figure-row__label {
  font-size: 14px;
  line-height: 1.75;
  color: var(--c-muted);
}

.page-about .about-figures__more {
  margin: 20px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--about-body);
}

.page-about .about-figures__more a {
  color: var(--c-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(34, 227, 211, .4);
}

.page-about .about-figures__more a:hover {
  border-bottom-color: var(--c-cyan);
}

@media (min-width: 900px) {
  .page-about .timeline-layout {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    column-gap: 64px;
    align-items: start;
  }
}

/* ---------- 收尾 ---------- */

.page-about .about-cta {
  padding-top: clamp(56px, 8vw, 96px);
}

.page-about .about-cta__panel {
  position: relative;
  display: grid;
  gap: 28px;
  padding: clamp(28px, 4.5vw, 48px);
  border: 1px solid var(--edge-cyan);
  border-radius: var(--radius);
  background: linear-gradient(120deg, rgba(34, 227, 211, .10), rgba(5, 10, 24, .18) 46%, rgba(255, 61, 139, .12));
  box-shadow: var(--shadow-soft);
}

.page-about .about-cta__copy h2 {
  margin: 0 0 12px;
  font-size: clamp(21px, 3.4vw, 31px);
  line-height: 1.28;
  letter-spacing: .02em;
  color: var(--c-mist);
}

.page-about .about-cta__copy p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--about-body);
  max-width: 40em;
}

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

@media (min-width: 840px) {
  .page-about .about-cta__panel {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
    align-items: center;
    column-gap: 48px;
  }

  .page-about .about-cta__actions {
    justify-content: flex-end;
  }
}
</main>