.page-about {
  --about-warm: #e8925c;
  --about-cool: #7fa8c9;
  --about-radius: 22px;
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  padding: clamp(1rem, 3vw, 2rem) 0 clamp(2.6rem, 7vw, 5rem);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  z-index: 0;
  top: -12%;
  right: -24%;
  width: 96%;
  height: 74%;
  background: linear-gradient(212deg, rgba(26, 43, 76, 0.92) 0%, rgba(11, 36, 56, 0.2) 58%, rgba(6, 24, 38, 0) 100%);
  clip-path: polygon(18% 0, 100% 0, 78% 100%, 0 62%);
  pointer-events: none;
}

.page-about .about-hero > .shell {
  position: relative;
  z-index: 1;
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(1.6rem, 4vw, 2.8rem);
  align-items: end;
  margin-top: clamp(1.4rem, 4vw, 2.6rem);
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.05rem, 1.35rem + 4vw, 4.15rem);
  line-height: 1.14;
  letter-spacing: 0.01em;
  margin: 0.5rem 0 1rem;
  color: var(--foam);
  text-wrap: balance;
}

.page-about .about-hero__lede {
  max-width: 46ch;
  color: var(--foam-soft);
  margin-bottom: 0;
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.9rem 1.2rem;
  margin: 1.7rem 0 1rem;
  padding: 1.1rem 0;
  border-top: var(--line);
  border-bottom: var(--line);
}

.page-about .about-hero__fact {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.page-about .about-hero__num {
  font-family: var(--font-mono);
  font-size: clamp(1.2rem, 1rem + 0.9vw, 1.6rem);
  font-weight: 700;
  color: var(--gold);
  letter-spacing: 0.02em;
}

.page-about .about-hero__label {
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  color: var(--mist);
}

.page-about .about-hero__figure {
  margin: 0;
  position: relative;
}

.page-about .about-hero__figure .frame__img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: var(--about-radius);
  border: 1px solid var(--steel);
  box-shadow: var(--shadow-soft);
}

.page-about .about-hero__figure::after {
  content: "";
  position: absolute;
  right: -10px;
  bottom: -10px;
  width: 84px;
  height: 84px;
  border-radius: 50%;
  border: 1px solid rgba(217, 164, 65, 0.55);
  box-shadow: 0 0 0 12px rgba(217, 164, 65, 0.07);
  pointer-events: none;
}

/* ---------- 起点 ---------- */
.page-about .about-origin__grid {
  display: grid;
  gap: clamp(1.4rem, 4vw, 2.8rem);
}

.page-about .about-origin__marks {
  list-style: none;
  margin: 1.3rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.75rem;
}

.page-about .about-origin__marks li {
  display: flex;
  gap: 0.7rem;
  align-items: baseline;
  font-size: 0.92rem;
  color: var(--foam-soft);
  line-height: 1.6;
}

.page-about .about-origin__mark-no {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--celadon);
  border: 1px solid rgba(127, 183, 163, 0.5);
  border-radius: 4px;
  padding: 0.05rem 0.38rem;
  flex: none;
}

.page-about .about-origin__body p {
  max-width: 62ch;
  color: var(--foam-soft);
}

.page-about .about-quote {
  margin: 1.7rem 0 0;
  padding: 1.15rem 1.25rem;
  border: 1px solid var(--steel);
  border-left: 4px solid var(--gold);
  border-radius: 0 var(--radius-card) var(--radius-card) 0;
  background: linear-gradient(120deg, rgba(217, 164, 65, 0.1), rgba(11, 36, 56, 0.4));
  font-family: var(--font-display);
  font-size: var(--step-1);
  line-height: 1.72;
  color: var(--foam);
  max-width: 54ch;
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline__grid {
  display: grid;
  gap: clamp(1.4rem, 4vw, 2.8rem);
}

.page-about .about-timeline__intro {
  max-width: 56ch;
  color: var(--foam-soft);
  margin-bottom: 1.8rem;
}

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

.page-about .timeline__item {
  position: relative;
  display: grid;
  gap: 0.45rem;
  padding: 0 0 1.7rem 1.35rem;
  border-left: 1px solid rgba(46, 74, 95, 0.85);
}

.page-about .timeline__item:last-child {
  border-left-color: transparent;
  padding-bottom: 0;
}

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 0.5rem;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 0 4px rgba(217, 164, 65, 0.16);
}

.page-about .timeline__year {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.86rem;
  letter-spacing: 0.1em;
  color: var(--gold);
}

.page-about .timeline__title {
  margin: 0 0 0.45rem;
  font-family: var(--font-display);
  font-size: var(--step-1);
  font-weight: 700;
  color: var(--foam);
  line-height: 1.45;
}

.page-about .timeline__text {
  margin: 0;
  max-width: 58ch;
  color: var(--foam-soft);
  font-size: 0.95rem;
  line-height: 1.8;
}

.page-about .timeline__detail {
  margin-top: 0.8rem;
  padding: 0.6rem 0.85rem;
  border: 1px solid rgba(46, 74, 95, 0.75);
  border-radius: var(--radius-soft);
  background: rgba(11, 36, 56, 0.62);
  max-width: 56ch;
}

.page-about .timeline__detail summary {
  cursor: pointer;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.08em;
  color: var(--celadon);
}

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

.page-about .timeline__detail summary::after {
  content: " +";
}

.page-about .timeline__detail[open] summary::after {
  content: " −";
}

.page-about .timeline__detail summary:hover,
.page-about .timeline__detail summary:focus-visible {
  color: var(--amber);
}

.page-about .timeline__detail p {
  margin: 0.55rem 0 0;
  font-size: 0.88rem;
  line-height: 1.75;
  color: var(--foam-soft);
}

/* ---------- 团队 ---------- */
.page-about .about-crew__grid {
  display: grid;
  gap: clamp(1.3rem, 3.5vw, 2.4rem);
  margin-bottom: clamp(1.6rem, 4vw, 2.6rem);
}

.page-about .about-crew__intro p {
  max-width: 54ch;
  color: var(--foam-soft);
}

.page-about .about-crew__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: rgba(46, 74, 95, 0.9);
  border: 1px solid rgba(46, 74, 95, 0.9);
  border-radius: var(--radius-soft);
  overflow: hidden;
}

.page-about .about-crew__stat {
  background: var(--harbor);
  padding: 1rem 0.9rem;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.page-about .about-crew__stat-num {
  font-family: var(--font-mono);
  font-size: clamp(1.15rem, 0.95rem + 0.9vw, 1.55rem);
  font-weight: 700;
  color: var(--gold);
}

.page-about .about-crew__stat-label {
  font-size: 0.76rem;
  letter-spacing: 0.08em;
  color: var(--mist);
  line-height: 1.5;
}

.page-about .about-crew__body {
  display: grid;
  gap: clamp(1.4rem, 4vw, 2.6rem);
}

.page-about .about-crew__roles {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1rem;
}

.page-about .about-crew__role {
  position: relative;
  padding: 1.05rem 1.1rem 1.1rem;
  border: 1px solid rgba(46, 74, 95, 0.85);
  border-radius: var(--radius-card);
  background: linear-gradient(150deg, rgba(11, 36, 56, 0.9), rgba(6, 24, 38, 0.55));
  box-shadow: var(--shadow-hard);
  transition: transform 0.35s var(--ease-out), border-color 0.35s var(--ease-out);
}

.page-about .about-crew__role:hover,
.page-about .about-crew__role:focus-within {
  transform: translateY(-3px);
  border-color: rgba(217, 164, 65, 0.55);
}

.page-about .about-crew__role-no {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--celadon);
  letter-spacing: 0.1em;
  margin-bottom: 0.3rem;
}

.page-about .about-crew__role-title {
  margin: 0 0 0.45rem;
  font-family: var(--font-display);
  font-size: var(--step-1);
  color: var(--foam);
}

.page-about .about-crew__role p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.78;
  color: var(--foam-soft);
}

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

.page-about .about-crew__figure .frame__img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: var(--about-radius);
  border: 1px solid var(--steel);
  box-shadow: var(--shadow-soft);
}

/* ---------- 双城 ---------- */
.page-about .about-twincity__head {
  margin-bottom: clamp(1.4rem, 4vw, 2.2rem);
}

.page-about .about-twincity__lede {
  max-width: 56ch;
  color: var(--foam-soft);
}

.page-about .twincity {
  display: grid;
  gap: 1px;
  background: rgba(46, 74, 95, 0.9);
  border: 1px solid rgba(46, 74, 95, 0.9);
  border-radius: var(--about-radius);
  overflow: hidden;
}

.page-about .twincity__pane {
  padding: clamp(1.3rem, 4vw, 2.3rem);
}

.page-about .twincity__pane--warm {
  background:
    radial-gradient(120% 95% at 0% 0%, rgba(232, 146, 92, 0.3), rgba(11, 36, 56, 0.96) 62%),
    var(--harbor);
}

.page-about .twincity__pane--cool {
  background:
    radial-gradient(125% 95% at 100% 0%, rgba(127, 168, 201, 0.28), rgba(6, 24, 38, 0.98) 62%),
    var(--ink);
}

.page-about .twincity__place {
  margin: 0 0 0.45rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  color: var(--mist);
}

.page-about .twincity__title {
  margin: 0 0 0.8rem;
  font-family: var(--font-display);
  font-size: var(--step-2);
  font-weight: 800;
  line-height: 1.35;
  color: var(--foam);
}

.page-about .twincity__pane--warm .twincity__title {
  color: #f7d9c2;
}

.page-about .twincity__pane--cool .twincity__title {
  color: #d4e4f2;
}

.page-about .twincity__pane p {
  max-width: 46ch;
  color: var(--foam-soft);
  font-size: 0.95rem;
  line-height: 1.8;
}

.page-about .twincity__figure {
  margin: 1.2rem 0 0;
}

.page-about .twincity__figure .frame__img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-soft);
  border: 1px solid rgba(127, 168, 201, 0.45);
}

.page-about .about-twincity__note {
  margin: clamp(1.2rem, 3vw, 1.8rem) 0 0;
  padding-left: 1rem;
  border-left: 2px solid var(--celadon);
  max-width: 68ch;
  font-size: 0.94rem;
  line-height: 1.8;
  color: var(--foam-soft);
}

/* ---------- 节奏 ---------- */
.page-about .about-cadence__head {
  margin-bottom: clamp(1.3rem, 3.5vw, 2rem);
}

.page-about .about-cadence__lede {
  max-width: 54ch;
  color: var(--foam-soft);
}

.page-about .cadence {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid rgba(46, 74, 95, 0.9);
}

.page-about .cadence__row {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.3rem 0.8rem;
  align-items: baseline;
  padding: 1rem 0;
  border-bottom: 1px solid rgba(46, 74, 95, 0.9);
}

.page-about .cadence__when {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.05em;
  color: var(--gold);
  grid-column: 1 / -1;
}

.page-about .cadence__what {
  font-family: var(--font-display);
  font-size: var(--step-0);
  font-weight: 700;
  color: var(--foam);
}

.page-about .cadence__desc {
  grid-column: 1 / -1;
  font-size: 0.9rem;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .cadence__row .tag {
  grid-column: 2;
  justify-self: end;
  align-self: start;
}

/* ---------- 结尾入口 ---------- */
.page-about .about-cta__panel {
  position: relative;
  display: grid;
  gap: clamp(1.4rem, 4vw, 2.6rem);
  padding: clamp(1.4rem, 4vw, 2.6rem);
  border: 1px solid rgba(217, 164, 65, 0.45);
  border-radius: var(--about-radius);
  background:
    radial-gradient(90% 120% at 100% 0%, rgba(217, 164, 65, 0.16), rgba(11, 36, 56, 0.9) 58%),
    var(--harbor);
  box-shadow: var(--shadow-soft);
}

.page-about .about-cta__title {
  margin: 0.4rem 0 0.7rem;
  font-family: var(--font-display);
  font-size: var(--step-2);
  font-weight: 800;
  line-height: 1.35;
  color: var(--foam);
}

.page-about .about-cta__copy p {
  max-width: 54ch;
  color: var(--foam-soft);
  font-size: 0.95rem;
  line-height: 1.8;
}

.page-about .about-cta__links {
  display: grid;
  gap: 0.75rem;
}

.page-about .about-cta__link {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 0.2rem 1rem;
  padding: 0.95rem 1.05rem;
  border: 1px solid rgba(46, 74, 95, 0.95);
  border-radius: var(--radius-card);
  background: rgba(6, 24, 38, 0.72);
  text-decoration: none;
  transition: border-color 0.3s var(--ease-out), transform 0.3s var(--ease-out), background 0.3s var(--ease-out);
}

.page-about .about-cta__link:hover,
.page-about .about-cta__link:focus-visible {
  border-color: var(--gold);
  background: rgba(217, 164, 65, 0.1);
  transform: translateX(3px);
}

.page-about .about-cta__link-label {
  font-family: var(--font-display);
  font-size: var(--step-0);
  font-weight: 700;
  color: var(--foam);
}

.page-about .about-cta__link-desc {
  grid-column: 1;
  font-size: 0.84rem;
  line-height: 1.6;
  color: var(--mist);
}

.page-about .about-cta__link-arrow {
  grid-row: 1 / span 2;
  grid-column: 2;
  font-family: var(--font-mono);
  font-size: 1.05rem;
  color: var(--gold);
}

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-crew__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-about .cadence__row {
    grid-template-columns: 190px minmax(0, 1fr) auto;
    gap: 0.4rem 1.4rem;
  }

  .page-about .cadence__when {
    grid-column: 1;
    text-align: right;
  }

  .page-about .cadence__what {
    grid-column: 2;
  }

  .page-about .cadence__desc {
    grid-column: 2;
  }

  .page-about .cadence__row .tag {
    grid-column: 3;
    grid-row: 1 / span 2;
    align-self: center;
  }
}

@media (min-width: 880px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, 0.98fr);
    gap: clamp(2rem, 4vw, 3.4rem);
  }

  .page-about .about-origin__grid {
    grid-template-columns: 230px minmax(0, 1fr);
    gap: clamp(2rem, 4vw, 3.2rem);
  }

  .page-about .about-timeline__grid {
    grid-template-columns: 230px minmax(0, 1fr);
    gap: clamp(2rem, 4vw, 3.2rem);
  }

  .page-about .about-timeline__aside {
    position: sticky;
    top: 96px;
    align-self: start;
  }

  .page-about .timeline {
    background: linear-gradient(
      to right,
      transparent 149px,
      rgba(46, 74, 95, 0.9) 149px,
      rgba(46, 74, 95, 0.9) 150px,
      transparent 150px
    );
  }

  .page-about .timeline__item {
    grid-template-columns: 150px minmax(0, 1fr);
    column-gap: 2.4rem;
    border-left: 0;
    padding: 0 0 2.3rem 0;
  }

  .page-about .timeline__item::before {
    left: 145px;
    top: 0.55rem;
  }

  .page-about .timeline__year {
    text-align: right;
    padding-right: 1.4rem;
    padding-top: 0.3rem;
  }

  .page-about .about-crew__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.85fr);
    align-items: start;
    gap: clamp(2rem, 4vw, 3rem);
  }

  .page-about .about-crew__body {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: start;
    gap: clamp(2rem, 4vw, 3rem);
  }

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

  .page-about .twincity {
    grid-template-columns: 1fr 1fr;
  }

  .page-about .about-cta__panel {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.95fr);
    align-items: center;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-crew__role,
  .page-about .about-cta__link {
    transition: none;
  }

  .page-about .about-crew__role:hover,
  .page-about .about-crew__role:focus-within,
  .page-about .about-cta__link:hover,
  .page-about .about-cta__link:focus-visible {
    transform: none;
  }
}