.page-about {
  --about-hairline: rgba(140, 149, 168, .28);
  --about-cyan-soft: rgba(53, 214, 232, .10);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(115% 88% at 90% 10%, rgba(14, 58, 68, .82) 0%, rgba(10, 17, 32, 0) 60%),
    linear-gradient(158deg, #0A1120 0%, #111B2E 58%, #0A1120 100%);
  color: var(--silver-200);
  padding: calc(var(--top-offset) + clamp(34px, 6vw, 80px)) 0 clamp(50px, 7vw, 104px);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: -8%;
  right: 38%;
  bottom: -40%;
  height: 70%;
  background: linear-gradient(100deg, rgba(53, 214, 232, .10), rgba(53, 214, 232, 0) 72%);
  border-radius: 0 0 0 340px;
  transform: skewY(-6deg);
  pointer-events: none;
}

.page-about .hero-inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 52px);
  align-items: end;
}

.page-about .breadcrumb-list {
  color: var(--silver-500);
  font-size: .84rem;
  letter-spacing: .04em;
}

.page-about .breadcrumb-list a {
  color: var(--silver-200);
  text-decoration: none;
}

.page-about .breadcrumb-list a:hover,
.page-about .breadcrumb-list a:focus-visible {
  color: var(--cyan);
}

.page-about .eyebrow {
  margin-top: clamp(16px, 2.4vw, 26px);
  color: var(--gold);
  letter-spacing: .12em;
}

.page-about .about-h1 {
  margin: clamp(12px, 2vw, 20px) 0 clamp(16px, 2.4vw, 26px);
  font-size: clamp(2.05rem, 4.5vw, 3.55rem);
  font-weight: 300;
  line-height: 1.24;
  letter-spacing: .008em;
  color: var(--paper);
  max-width: 17ch;
}

.page-about .about-lede {
  max-width: 60ch;
  margin: 0;
  color: var(--silver-200);
  line-height: 1.86;
}

.page-about .hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3vw, 34px);
}

.page-about .hero-plot {
  border: 1px solid rgba(53, 214, 232, .24);
  background: linear-gradient(180deg, rgba(27, 39, 64, .78), rgba(10, 17, 32, .62));
  border-radius: var(--radius-panel);
  padding: clamp(20px, 2.6vw, 28px);
}

.page-about .hero-plot .index-label {
  color: var(--silver-500);
}

.page-about .plot-list {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
}

.page-about .plot-list li {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 11px 0;
  border-bottom: 1px dashed var(--about-hairline);
}

.page-about .plot-list li:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.page-about .plot-key {
  font-size: .86rem;
  color: var(--silver-500);
  letter-spacing: .05em;
}

.page-about .plot-val {
  font-size: 1.3rem;
  color: var(--cyan);
  letter-spacing: -.01em;
}

/* ---------- 定位 ---------- */
.page-about .about-position {
  padding: var(--section-y) 0;
}

.page-about .position-split {
  align-items: start;
  gap: clamp(28px, 4vw, 56px);
}

.page-about .about-position .index-label {
  color: var(--cyan);
}

.page-about .about-position .section-title {
  color: var(--paper);
  margin: 12px 0 clamp(18px, 2.4vw, 26px);
  max-width: 20ch;
}

.page-about .position-text-body {
  margin: 0 0 16px;
  color: var(--silver-200);
  line-height: 1.88;
  max-width: 58ch;
}

.page-about .coord-list {
  list-style: none;
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0;
  display: grid;
  gap: 13px;
}

.page-about .coord-list li {
  position: relative;
  padding-left: 22px;
  color: var(--silver-200);
  line-height: 1.78;
  font-size: .96rem;
}

.page-about .coord-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .72em;
  width: 11px;
  height: 1px;
  background: var(--cyan);
}

.page-about .position-figure {
  border-radius: var(--radius-panel);
  overflow: hidden;
  margin: 0;
}

.page-about .position-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
}

/* ---------- 理念 ---------- */
.page-about .about-beliefs {
  padding: var(--section-y) 0;
  color: var(--ink-900);
}

.page-about .about-beliefs .index-label {
  color: var(--ink-500);
}

.page-about .about-beliefs .section-title {
  color: var(--ink-900);
}

.page-about .section-note {
  margin: 0;
  font-size: .96rem;
  line-height: 1.8;
  color: var(--ink-500);
  max-width: 42ch;
}

.page-about .section-note--dark {
  color: var(--silver-500);
}

.page-about .creed {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 24px;
  margin: clamp(30px, 4vw, 48px) 0 clamp(30px, 4vw, 46px);
  padding: clamp(20px, 3vw, 32px) 0;
  border-top: 1px solid rgba(44, 59, 88, .22);
  border-bottom: 1px solid rgba(44, 59, 88, .22);
}

.page-about .creed-line {
  flex: 1 1 22ch;
  font-size: clamp(1.35rem, 2.6vw, 2.05rem);
  font-weight: 300;
  line-height: 1.5;
  letter-spacing: .01em;
  color: var(--ink-900);
  transition: font-weight 240ms ease, color 240ms ease;
}

.page-about .creed:hover .creed-line {
  font-weight: 500;
}

.page-about .creed-index {
  color: var(--gold);
  white-space: nowrap;
}

.page-about .belief-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 3.4vw, 36px);
}

.page-about .belief-item {
  position: relative;
  padding-top: clamp(16px, 2.2vw, 24px);
  border-top: 2px solid rgba(44, 59, 88, .35);
  transition: border-color 240ms ease;
}

.page-about .belief-item:hover {
  border-top-color: var(--cyan);
}

.page-about .belief-num {
  margin: 0;
  font-size: .82rem;
  letter-spacing: .14em;
  color: var(--gold);
}

.page-about .belief-title {
  margin: 12px 0 12px;
  font-size: 1.22rem;
  font-weight: 500;
  color: var(--ink-900);
}

.page-about .belief-text {
  margin: 0;
  line-height: 1.85;
  color: var(--ink-500);
}

.page-about .belief-do {
  margin: 16px 0 0;
  padding: 14px 16px;
  border-radius: var(--radius-sm);
  background: var(--about-cyan-soft);
  font-size: .93rem;
  line-height: 1.78;
  color: var(--ink-700);
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  position: relative;
  overflow: hidden;
  padding: var(--section-y) 0;
}

.page-about .tl-backdrop {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.page-about .tl-backdrop img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .3;
  filter: grayscale(.4) contrast(1.06);
}

.page-about .tl-backdrop::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(10, 17, 32, .93), rgba(10, 17, 32, .84) 46%, rgba(10, 17, 32, .96));
}

.page-about .about-timeline > .container {
  position: relative;
  z-index: 1;
}

.page-about .about-timeline .index-label {
  color: var(--cyan);
}

.page-about .about-timeline .section-title {
  color: var(--paper);
  margin: 12px 0 14px;
  max-width: 22ch;
}

.page-about .timeline {
  position: relative;
  list-style: none;
  margin: clamp(32px, 5vw, 58px) 0 0;
  padding: 0;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(180deg, rgba(201, 162, 74, .8), rgba(140, 149, 168, .3));
}

.page-about .tl-item {
  position: relative;
  padding: 0 0 clamp(30px, 4vw, 46px) 34px;
  border-radius: var(--radius-sm);
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 5px;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  border: 1px solid var(--gold);
  background: var(--ink-900);
  box-shadow: 0 0 0 4px rgba(10, 17, 32, .92);
  transition: background-color 240ms ease, border-color 240ms ease;
}

.page-about .tl-item:hover::before,
.page-about .tl-item:focus-within::before,
.page-about .tl-item:focus-visible::before {
  background: var(--gold);
}

.page-about .tl-item:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 6px;
}

.page-about .tl-year {
  display: block;
  margin-bottom: 8px;
  font-size: 1.05rem;
  letter-spacing: .07em;
  color: var(--gold);
}

.page-about .tl-title {
  margin: 0 0 10px;
  font-size: 1.18rem;
  font-weight: 500;
  color: var(--paper);
}

.page-about .tl-text {
  margin: 0 0 12px;
  max-width: 46ch;
  color: var(--silver-200);
  line-height: 1.85;
  font-size: .97rem;
}

.page-about .tl-note {
  margin: 0;
  max-width: 52ch;
  padding: 12px 15px;
  border-radius: var(--radius-sm);
  border-left: 2px solid rgba(53, 214, 232, .5);
  background: rgba(53, 214, 232, .07);
  color: var(--silver-200);
  font-size: .92rem;
  line-height: 1.78;
  opacity: .7;
  transition: opacity 240ms ease, background-color 240ms ease;
}

.page-about .tl-item:hover .tl-note,
.page-about .tl-item:focus-within .tl-note {
  opacity: 1;
  background: rgba(53, 214, 232, .13);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  padding: var(--section-y) 0;
  color: var(--ink-900);
}

.page-about .about-team .index-label {
  color: var(--ink-500);
}

.page-about .about-team .section-title {
  color: var(--ink-900);
}

.page-about .team-grid {
  margin-top: clamp(28px, 4vw, 46px);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 3.2vw, 36px);
}

.page-about .team-cell {
  position: relative;
  padding-top: 20px;
}

.page-about .team-cell::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 36px;
  height: 2px;
  border-radius: 2px;
  background: var(--cyan);
}

.page-about .team-count {
  margin: 0;
  font-size: clamp(1.9rem, 3.6vw, 2.4rem);
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--ink-900);
}

.page-about .team-unit {
  margin-left: 5px;
  font-size: .84rem;
  letter-spacing: .04em;
  color: var(--ink-500);
}

.page-about .team-name {
  margin: 16px 0 10px;
  font-size: 1.06rem;
  font-weight: 500;
  color: var(--ink-900);
}

.page-about .team-text {
  margin: 0;
  font-size: .95rem;
  line-height: 1.8;
  color: var(--ink-500);
}

/* ---------- 协作生态 ---------- */
.page-about .about-eco {
  padding: var(--section-y) 0;
}

.page-about .about-eco .index-label {
  color: var(--cyan);
}

.page-about .about-eco .section-title {
  color: var(--paper);
  margin: 12px 0 14px;
  max-width: 24ch;
}

.page-about .eco-figure {
  margin: clamp(26px, 3.6vw, 42px) 0 0;
  border-radius: var(--radius-panel);
  overflow: hidden;
}

.page-about .eco-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
}

.page-about .eco-svg {
  display: block;
  width: 100%;
  height: auto;
  margin-top: clamp(24px, 3.4vw, 38px);
}

.page-about .eco-svg text {
  font-family: var(--font-sans);
}

.page-about .eco-meta {
  margin-top: clamp(26px, 3.6vw, 42px);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3vw, 34px);
}

.page-about .eco-cell {
  padding-top: 18px;
  border-top: 1px solid var(--about-hairline);
}

.page-about .eco-key {
  margin: 0;
  font-size: 1rem;
  letter-spacing: .08em;
  color: var(--gold);
}

.page-about .eco-title {
  margin: 12px 0 10px;
  font-size: 1.05rem;
  font-weight: 500;
  color: var(--paper);
}

.page-about .eco-text {
  margin: 0;
  font-size: .94rem;
  line-height: 1.82;
  color: var(--silver-500);
}

/* ---------- 下一步 ---------- */
.page-about .about-next {
  padding: var(--section-y) 0;
  color: var(--ink-900);
}

.page-about .about-next .index-label {
  color: var(--ink-500);
}

.page-about .about-next .section-title {
  color: var(--ink-900);
  margin: 12px 0 16px;
  max-width: 24ch;
}

.page-about .next-lede {
  margin: 0;
  max-width: 62ch;
  line-height: 1.86;
  color: var(--ink-500);
}

.page-about .next-grid {
  margin-top: clamp(28px, 4vw, 46px);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3vw, 32px);
}

.page-about .next-item {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: clamp(20px, 2.6vw, 28px);
  border-radius: var(--radius-panel);
  background: var(--silver-050);
  border: 1px solid rgba(44, 59, 88, .14);
  transition: background-color 240ms ease, border-color 240ms ease;
}

.page-about .next-item:hover {
  background: var(--paper);
  border-color: rgba(53, 214, 232, .5);
}

.page-about .next-tag {
  margin: 0;
  align-self: flex-start;
  padding: 5px 13px;
  border-radius: var(--radius-pill);
  background: rgba(53, 214, 232, .13);
  color: var(--ink-700);
  font-size: .78rem;
  letter-spacing: .08em;
}

.page-about .next-title {
  margin: 4px 0 0;
  font-size: 1.16rem;
  font-weight: 500;
  color: var(--ink-900);
}

.page-about .next-text {
  margin: 0;
  font-size: .95rem;
  line-height: 1.82;
  color: var(--ink-500);
}

.page-about .next-link {
  margin-top: auto;
  padding-top: 8px;
  font-size: .93rem;
  color: var(--ink-900);
  text-decoration: none;
  border-bottom: 1px solid rgba(44, 59, 88, .25);
  align-self: flex-start;
  transition: color 240ms ease, border-color 240ms ease;
}

.page-about .next-link:hover,
.page-about .next-link:focus-visible {
  color: var(--ink-700);
  border-color: var(--cyan);
}

.page-about .next-foot {
  margin-top: clamp(30px, 4vw, 48px);
  padding-top: clamp(22px, 3vw, 32px);
  border-top: 1px solid rgba(44, 59, 88, .2);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.page-about .next-foot-text {
  margin: 0;
  flex: 1 1 34ch;
  font-size: .95rem;
  line-height: 1.8;
  color: var(--ink-500);
}

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

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

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

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

@media (min-width: 960px) {
  .page-about .hero-inner {
    grid-template-columns: minmax(0, 1.45fr) minmax(280px, .85fr);
  }

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

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

@media (min-width: 980px) {
  .page-about .timeline {
    --tl-gap: clamp(40px, 5vw, 80px);
  }

  .page-about .timeline::before {
    left: 50%;
  }

  .page-about .tl-item {
    display: grid;
    grid-template-columns: 1fr 1fr;
    column-gap: var(--tl-gap);
    padding: 0 0 clamp(38px, 4vw, 62px);
  }

  .page-about .tl-item::before {
    left: 50%;
    transform: translateX(-50%);
    top: 4px;
  }

  .page-about .tl-body {
    grid-column: 1 / 2;
    text-align: right;
  }

  .page-about .tl-item:nth-child(even) .tl-body {
    grid-column: 2 / 3;
    text-align: left;
  }

  .page-about .tl-item:nth-child(odd) .tl-text,
  .page-about .tl-item:nth-child(odd) .tl-note {
    margin-left: auto;
  }

  .page-about .tl-item:nth-child(odd) .tl-note {
    border-left: 0;
    border-right: 2px solid rgba(53, 214, 232, .5);
  }
}

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

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

@media (prefers-reduced-motion: reduce) {
  .page-about .creed-line,
  .page-about .belief-item,
  .page-about .tl-item::before,
  .page-about .tl-note,
  .page-about .next-item,
  .page-about .next-link {
    transition: none;
  }
}