.page-about {
  --about-hair: rgba(127, 243, 228, 0.16);
  --about-warm-veil: rgba(255, 138, 61, 0.12);
  --about-cool-veil: rgba(43, 232, 208, 0.09);
  position: relative;
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding-top: clamp(28px, 4vw, 48px);
  padding-bottom: clamp(56px, 8vw, 100px);
}

.page-about .about-hero .breadcrumbs {
  margin-bottom: clamp(28px, 5vw, 56px);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(34px, 6vw, 72px);
  align-items: start;
}

.page-about .about-hero__copy {
  max-width: 40ch;
}

.page-about .about-hero__copy .display-title {
  margin: 14px 0 22px;
  line-height: 0.98;
  color: var(--mist);
}

.page-about .about-hero__body {
  color: var(--slate);
  font-size: 16px;
  line-height: 1.85;
  max-width: 46ch;
  margin-top: 18px;
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  margin-top: clamp(28px, 4vw, 44px);
  padding-top: 22px;
  border-top: 1px solid var(--about-hair);
}

.page-about .about-hero__stats .stat__value {
  display: block;
  font-size: clamp(22px, 3vw, 30px);
  color: var(--cyan);
  letter-spacing: -0.01em;
}

.page-about .about-hero__stats .stat__label {
  display: block;
  margin-top: 6px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--slate);
  line-height: 1.5;
}

.page-about .about-hero__media {
  aspect-ratio: 14 / 9;
  margin: 0;
}

.page-about .about-hero__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: 62% 50%;
}

/* ---------- 通用标题组 ---------- */
.page-about .section {
  position: relative;
  padding-block: clamp(56px, 8vw, 108px);
}

.page-about .section__head {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-bottom: clamp(30px, 5vw, 56px);
}

.page-about .about-heading {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(28px, 4.4vw, 54px);
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: var(--mist);
  margin: 8px 0 0;
}

.page-about .about-sub {
  margin-top: 14px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--slate);
  max-width: 60ch;
}

/* ---------- 团队 ---------- */
.page-about .about-team__layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 48px);
}

.page-about .about-team__boards {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

.page-about .about-board {
  position: relative;
  padding: 26px 24px 30px;
  border: 1px solid var(--about-hair);
  border-radius: var(--radius-lg);
  background:
    radial-gradient(120% 130% at 0% 0%, var(--about-cool-veil), transparent 58%),
    var(--hull);
  transition: transform 180ms var(--ease), border-color 180ms var(--ease);
  outline: none;
}

.page-about .about-board--orange {
  background:
    radial-gradient(120% 130% at 0% 0%, var(--about-warm-veil), transparent 58%),
    var(--hull);
}

.page-about .about-board:hover,
.page-about .about-board:focus-visible {
  transform: translateY(-2px);
  border-color: var(--line-strong);
}

.page-about .about-board__no {
  display: inline-block;
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--cyan-soft);
  border-bottom: 1px solid var(--about-hair);
  padding-bottom: 6px;
}

.page-about .about-board__title {
  margin: 14px 0 4px;
  font-family: var(--font-display);
  font-size: clamp(20px, 2.4vw, 26px);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--mist);
}

.page-about .about-board__lead {
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--orange);
  letter-spacing: 0.04em;
  margin-bottom: 12px;
}

.page-about .about-board__text {
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
  max-width: 42ch;
}

.page-about .about-board__more {
  margin-top: 0;
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--slate);
  transition: max-height 260ms var(--ease), opacity 220ms var(--ease), margin-top 220ms var(--ease);
}

.page-about .about-board:hover .about-board__more,
.page-about .about-board:focus-visible .about-board__more {
  max-height: 260px;
  opacity: 1;
  margin-top: 14px;
}

.page-about .about-board .annotation--vertical {
  position: absolute;
  top: 26px;
  right: 18px;
  writing-mode: vertical-rl;
  letter-spacing: 0.24em;
  color: var(--slate);
  opacity: 0.7;
}

.page-about .about-team__media {
  aspect-ratio: 12 / 7;
  margin: 0;
}

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

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  background:
    linear-gradient(180deg, rgba(10, 37, 64, 0.55), rgba(4, 18, 31, 0) 62%);
}

.page-about .about-timeline__banner {
  aspect-ratio: 16 / 8;
  margin: 0 0 clamp(34px, 5vw, 60px);
}

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

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

.page-about .about-axis::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 6px;
  bottom: 6px;
  width: 1px;
  background: linear-gradient(180deg, var(--line-strong), rgba(127, 243, 228, 0.08));
}

.page-about .about-axis__item {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px;
  padding: 0 0 30px 30px;
}

.page-about .about-axis__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--abyss);
  border: 2px solid var(--cyan);
  box-shadow: 0 0 0 4px rgba(43, 232, 208, 0.08);
}

.page-about .about-axis__item--now::before {
  background: var(--orange);
  border-color: var(--orange);
  box-shadow: 0 0 0 5px rgba(255, 138, 61, 0.16);
}

.page-about .about-axis__year {
  font-size: 13px;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.page-about .about-axis__item--now .about-axis__year {
  color: var(--orange);
}

.page-about .about-axis__body h3 {
  font-family: var(--font-display);
  font-size: clamp(19px, 2.2vw, 24px);
  font-weight: 700;
  color: var(--mist);
  margin: 2px 0 8px;
  letter-spacing: -0.01em;
}

.page-about .about-axis__body p {
  font-size: 15px;
  line-height: 1.82;
  color: var(--slate);
  max-width: 58ch;
}

.page-about .about-axis__note {
  margin-top: 6px;
  padding-left: 30px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--slate);
}

.page-about .about-axis__note a {
  color: var(--cyan-soft);
  text-decoration: none;
  border-bottom: 1px solid var(--line-strong);
}

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

/* ---------- 稳定运行 ---------- */
.page-about .about-operation__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 48px);
}

.page-about .about-facts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .about-facts__item {
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
  padding: 20px 4px;
  border-bottom: 1px solid var(--about-hair);
}

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

.page-about .about-facts__key {
  font-size: 13px;
  letter-spacing: 0.2em;
  color: var(--cyan);
}

.page-about .about-facts__item p {
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
  max-width: 48ch;
}

.page-about .about-operation__panel {
  padding: 26px 24px;
}

.page-about .about-mini__title {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  color: var(--mist);
  letter-spacing: -0.01em;
  margin-bottom: 16px;
}

.page-about .about-meters {
  margin: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-meters__row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 14px;
  padding-bottom: 10px;
  border-bottom: 1px dashed rgba(143, 168, 184, 0.28);
}

.page-about .about-meters__row dt {
  font-size: 14px;
  color: var(--slate);
  line-height: 1.6;
}

.page-about .about-meters__row dd {
  margin: 0;
  font-size: 14px;
  color: var(--cyan-soft);
  white-space: nowrap;
}

.page-about .about-operation__hint {
  margin-top: 18px;
  font-size: 14px;
  line-height: 1.85;
  color: var(--slate);
}

.page-about .about-operation__aside .callout {
  margin-top: 20px;
}

.page-about .about-operation__aside .callout a {
  color: var(--amber);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 196, 138, 0.5);
}

/* ---------- 协作生态 ---------- */
.page-about .about-eco {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}

.page-about .about-eco__card {
  position: relative;
  padding: 24px 22px 26px;
  background: var(--panel);
  border: 1px solid var(--about-hair);
  border-radius: var(--radius) var(--radius-lg) var(--radius) var(--radius-lg);
  transition: transform 180ms var(--ease), border-color 180ms var(--ease);
}

.page-about .about-eco__card:hover {
  transform: translateY(-2px);
  border-color: var(--line-strong);
}

.page-about .about-eco__no {
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--cyan);
}

.page-about .about-eco__card h3 {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  color: var(--mist);
  margin: 10px 0 10px;
  letter-spacing: -0.01em;
}

.page-about .about-eco__card p {
  font-size: 14.5px;
  line-height: 1.82;
  color: var(--slate);
}

.page-about .about-reach {
  margin-top: clamp(28px, 4vw, 44px);
  padding: 26px 24px;
  border-radius: var(--radius-lg);
  background: linear-gradient(120deg, rgba(43, 232, 208, 0.08), rgba(255, 138, 61, 0.06));
  border: 1px solid var(--about-hair);
}

.page-about .about-reach__text {
  font-size: 15px;
  line-height: 1.85;
  color: var(--mist);
  max-width: 64ch;
}

.page-about .about-reach__tags {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 18px 0 0;
  padding: 0;
}

/* ---------- 下一步 ---------- */
.page-about .about-next {
  padding-bottom: clamp(64px, 9vw, 120px);
}

.page-about .about-next__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about .about-next__link {
  position: relative;
  display: block;
  padding: 24px 22px 22px;
  text-decoration: none;
  border: 1px solid var(--about-hair);
  border-radius: var(--radius-lg);
  background: linear-gradient(160deg, rgba(18, 58, 94, 0.72), rgba(4, 18, 31, 0.9));
  transition: transform 180ms var(--ease), border-color 180ms var(--ease);
}

.page-about .about-next__link:hover,
.page-about .about-next__link:focus-visible {
  transform: translateY(-3px);
  border-color: var(--line-strong);
}

.page-about .about-next__no {
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--cyan);
}

.page-about .about-next__link h3 {
  font-family: var(--font-display);
  font-size: 21px;
  font-weight: 700;
  color: var(--mist);
  margin: 10px 0 8px;
  letter-spacing: -0.01em;
}

.page-about .about-next__link p {
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--slate);
}

.page-about .about-next__go {
  display: inline-block;
  margin-top: 14px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--cyan-soft);
}

.page-about .about-next__link--accent {
  background: linear-gradient(160deg, rgba(255, 138, 61, 0.16), rgba(4, 18, 31, 0.92));
  border-color: rgba(255, 138, 61, 0.4);
}

.page-about .about-next__link--accent .about-next__no,
.page-about .about-next__link--accent .about-next__go {
  color: var(--amber);
}

.page-about .about-next__link--accent:hover,
.page-about .about-next__link--accent:focus-visible {
  border-color: var(--orange);
}

/* ---------- 呼吸光斑 ---------- */
.page-about .line-field--drift {
  animation: about-drift 11s ease-in-out infinite;
}

@keyframes about-drift {
  0%, 100% { opacity: 0.35; transform: translate3d(0, 0, 0); }
  50% { opacity: 0.7; transform: translate3d(-10px, -6px, 0); }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .line-field--drift { animation: none; }
  .page-about .about-board,
  .page-about .about-eco__card,
  .page-about .about-next__link { transition: none; }
}

/* ---------- 窄屏保护 ---------- */
@media (max-width: 560px) {
  .page-about .about-hero__stats {
    grid-template-columns: 1fr 1fr;
  }
  .page-about .about-meters__row {
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
  }
  .page-about .about-meters__row dd {
    white-space: normal;
  }
  .page-about .about-board .annotation--vertical {
    display: none;
  }
  .page-about .about-axis__note {
    padding-left: 0;
  }
}

/* ---------- 平板 ---------- */
@media (min-width: 721px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }
  .page-about .section__head {
    grid-template-columns: 84px minmax(0, 1fr);
    gap: 24px;
    align-items: start;
  }
  .page-about .about-team__boards {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .about-team__boards .about-board:first-child {
    grid-column: span 2;
  }
  .page-about .about-facts__item {
    grid-template-columns: 110px minmax(0, 1fr);
    align-items: baseline;
    gap: 20px;
  }
  .page-about .about-eco {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .about-next__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .about-axis__item {
    grid-template-columns: 120px minmax(0, 1fr);
    gap: 24px;
    align-items: start;
  }
  .page-about .about-axis__item::before {
    left: -5px;
  }
  .page-about .about-axis::before {
    left: 0;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 1081px) {
  .page-about .about-hero {
    padding-top: clamp(40px, 4vw, 64px);
  }
  .page-about .about-hero__media {
    margin-top: 32px;
  }
  .page-about .about-team__layout {
    grid-template-columns: minmax(0, 8fr) minmax(0, 4fr);
    align-items: start;
  }
  .page-about .about-team__boards {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .about-team__boards .about-board:first-child {
    grid-column: span 1;
  }
  .page-about .about-team__boards .about-board:nth-child(2) {
    margin-top: 30px;
  }
  .page-about .about-team__boards .about-board:nth-child(3) {
    margin-top: 12px;
  }
  .page-about .about-team__media {
    margin-top: 44px;
  }
  .page-about .about-operation__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }
  .page-about .about-eco {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .about-eco__card:nth-child(2) {
    margin-top: 22px;
  }
  .page-about .about-eco__card:nth-child(4) {
    margin-top: 22px;
  }
  .page-about .about-next__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .about-next__link:nth-child(2) {
    margin-top: 18px;
  }
  .page-about .about-next__link:nth-child(4) {
    margin-top: 18px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-board__more {
    max-height: none;
    opacity: 1;
    margin-top: 14px;
  }
}