.page-about {
  --about-gap: clamp(18px, 3vw, 34px);
  --about-radius-organic: 26px 10px 26px 10px;
  background: var(--ink);
  color: var(--stone);
  overflow-x: clip;
}

.page-about .about-copy {
  max-width: var(--w-text);
  font-size: 1rem;
  line-height: 1.75;
  color: var(--silver);
  margin: 0 0 18px;
}

.page-about .about-copy--wide {
  max-width: 52ch;
}

.page-about .about-num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--gold);
  margin: 0 0 12px;
}

.page-about .about-h2 {
  font-family: var(--font-cond);
  font-size: clamp(1.75rem, 4.4vw, 2.9rem);
  letter-spacing: 0.04em;
  line-height: 1.24;
  color: var(--stone);
  margin: 0 0 16px;
}

.page-about .about-fig {
  font-family: var(--font-mono);
  font-size: clamp(1.9rem, 6vw, 3rem);
  line-height: 1;
  color: var(--silver);
  margin: 0 0 10px;
}

.page-about .about-fig--amber { color: var(--amber); }
.page-about .about-fig--jade { color: var(--jade); }

.page-about .about-fig__label {
  display: block;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--slate);
}

.page-about .about-block {
  padding-block: clamp(56px, 8vw, 112px);
}

.page-about .about-block--tint {
  background: var(--ink-2);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding-block: clamp(24px, 5vw, 48px) clamp(48px, 8vw, 104px);
}

.page-about .about-hero__glow {
  position: absolute;
  left: -18%;
  top: -26%;
  width: 76vw;
  height: 76vw;
  max-width: 880px;
  max-height: 880px;
  border-radius: 50%;
  background: radial-gradient(circle, var(--glow-amber) 0%, rgba(11, 26, 46, 0) 64%);
  pointer-events: none;
  animation: aboutBreath 11s ease-in-out infinite;
}

@keyframes aboutBreath {
  0%, 100% { opacity: 0.35; }
  50% { opacity: 0.6; }
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
}

.page-about .about-hero__crumb {
  margin-bottom: clamp(20px, 4vw, 36px);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(28px, 5vw, 56px);
  align-items: center;
}

.page-about .about-hero__eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--gold);
  margin: 0 0 14px;
}

.page-about .about-hero__title {
  font-family: var(--font-cond);
  font-size: clamp(2.6rem, 7vw, 5.2rem);
  letter-spacing: 0.04em;
  line-height: 1.02;
  color: var(--stone);
  margin: 0 0 20px;
}

.page-about .about-hero__lede {
  max-width: 34em;
  font-size: clamp(1rem, 1.6vw, 1.125rem);
  line-height: 1.8;
  color: var(--silver);
  margin: 0 0 26px;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 30px;
}

.page-about .about-hero__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 28px;
  list-style: none;
  margin: 0;
  padding: 18px 0 0;
  border-top: 1px solid var(--line);
}

.page-about .about-hero__fig {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.35rem;
  color: var(--stone);
}

.page-about .about-hero__cap {
  display: block;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--slate);
  margin-top: 4px;
}

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

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-radius: var(--radius-lg);
  filter: saturate(0.92) contrast(1.05);
}

/* ---------- 三条规则 ---------- */
.page-about .about-vow {
  display: grid;
  gap: var(--about-gap);
  margin-top: clamp(28px, 5vw, 44px);
}

.page-about .about-vow__item {
  position: relative;
  padding: 24px 22px 26px;
  background: linear-gradient(160deg, rgba(27, 53, 87, 0.85), rgba(18, 38, 61, 0.6));
  border-radius: var(--about-radius-organic);
}

.page-about .about-vow__item--offset {
  background: linear-gradient(200deg, rgba(124, 139, 98, 0.24), rgba(18, 38, 61, 0.7));
}

.page-about .about-vow__idx {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--gold);
  margin: 0 0 10px;
}

.page-about .about-vow__title {
  font-family: var(--font-cond);
  font-size: 1.2rem;
  letter-spacing: 0.03em;
  color: var(--stone);
  margin: 0 0 10px;
}

.page-about .about-vow__text {
  font-size: 0.95rem;
  line-height: 1.75;
  color: var(--silver);
  margin: 0;
}

/* ---------- 呼吸点 ---------- */
.page-about .about-breath {
  padding-block: clamp(52px, 9vw, 104px);
  background:
    radial-gradient(ellipse at 20% 50%, var(--glow-amber) 0%, rgba(11, 26, 46, 0) 60%),
    var(--ink);
}

.page-about .about-breath__inner {
  text-align: left;
}

.page-about .about-breath__text {
  font-family: var(--font-cond);
  font-size: clamp(2.2rem, 7.5vw, 4.6rem);
  letter-spacing: 0.06em;
  line-height: 1.12;
  color: var(--stone);
  margin: 0 0 16px;
}

.page-about .about-breath__sub {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--slate);
  margin: 0;
}

/* ---------- 时间轴 ---------- */
.page-about .about-axis {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
}

.page-about .about-axis__nav {
  display: none;
}

.page-about .about-axis__list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-left: 1px solid var(--line);
}

.page-about .about-axis__link {
  display: block;
  padding: 9px 0 9px 16px;
  font-size: 13px;
  color: var(--slate);
  text-decoration: none;
  transition: color 0.25s ease, border-color 0.25s ease;
  border-left: 2px solid transparent;
  margin-left: -1px;
}

.page-about .about-axis__link:hover,
.page-about .about-axis__link:focus-visible {
  color: var(--stone);
  border-left-color: var(--amber);
}

.page-about .about-axis__tick {
  display: block;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  color: var(--gold);
  margin-bottom: 2px;
}

.page-about .about-tl {
  position: relative;
  margin-top: clamp(24px, 4vw, 40px);
  padding-left: 22px;
}

.page-about .about-tl::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 10px;
  bottom: 18px;
  width: 1px;
  background: linear-gradient(180deg, rgba(201, 162, 39, 0), var(--gold) 12%, var(--gold) 88%, rgba(201, 162, 39, 0));
  opacity: 0.55;
}

.page-about .about-tl__item {
  position: relative;
  border-bottom: 1px solid var(--line);
}

.page-about .about-tl__item::before {
  content: "";
  position: absolute;
  left: -22px;
  top: 26px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 0 4px rgba(201, 162, 39, 0.14);
}

.page-about .about-tl__item[open]::before {
  background: var(--amber);
  box-shadow: 0 0 0 5px rgba(242, 169, 59, 0.18);
}

.page-about .about-tl__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 14px;
  padding: 20px 0;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-tl__head::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--slate);
}

.page-about .about-tl__item[open] .about-tl__head::after {
  content: "\2212";
  color: var(--amber);
}

.page-about .about-tl__year {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  color: var(--gold);
}

.page-about .about-tl__gen {
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--slate);
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  padding: 2px 10px;
}

.page-about .about-tl__title {
  flex: 1 1 200px;
  font-family: var(--font-cond);
  font-size: clamp(1rem, 2.4vw, 1.18rem);
  letter-spacing: 0.02em;
  color: var(--stone);
}

.page-about .about-tl__body {
  padding: 0 0 22px;
}

.page-about .about-tl__body p {
  max-width: var(--w-text);
  font-size: 0.95rem;
  line-height: 1.78;
  color: var(--silver);
  margin: 0;
}

/* ---------- 内容体系 ---------- */
.page-about .about-system {
  position: relative;
  overflow: hidden;
}

.page-about .about-system__texture {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.26;
  pointer-events: none;
}

.page-about .about-system__inner {
  position: relative;
  z-index: 1;
}

.page-about .about-clusters {
  display: grid;
  gap: var(--about-gap);
  margin-top: clamp(26px, 4vw, 40px);
}

.page-about .about-cluster {
  padding: 22px 22px 24px;
  background: rgba(27, 53, 87, 0.72);
  border-radius: var(--about-radius-organic);
}

.page-about .about-cluster--amber { box-shadow: inset 3px 0 0 var(--amber); }
.page-about .about-cluster--gold { box-shadow: inset 3px 0 0 var(--gold); }
.page-about .about-cluster--moss { box-shadow: inset 3px 0 0 var(--moss); }
.page-about .about-cluster--jade { box-shadow: inset 3px 0 0 var(--jade); }
.page-about .about-cluster--clay { box-shadow: inset 3px 0 0 var(--clay); }

.page-about .about-cluster__title {
  font-family: var(--font-cond);
  font-size: 1.22rem;
  letter-spacing: 0.03em;
  color: var(--stone);
  margin: 12px 0 8px;
}

.page-about .about-cluster__note {
  font-size: 0.92rem;
  line-height: 1.7;
  color: var(--silver);
  margin: 0 0 14px;
}

.page-about .about-cluster__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-cluster__list li {
  position: relative;
  padding-left: 16px;
  font-size: 0.88rem;
  line-height: 1.9;
  color: var(--slate);
}

.page-about .about-cluster__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.78em;
  width: 6px;
  height: 1px;
  background: var(--line-strong);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: var(--about-gap);
  margin-top: clamp(26px, 4vw, 40px);
}

.page-about .about-team__unit {
  padding: 24px 22px 26px;
  border-radius: var(--radius);
  background: var(--ink-2);
}

.page-about .about-team__unit--gold { background: linear-gradient(180deg, rgba(201, 162, 39, 0.14), var(--ink-2)); }
.page-about .about-team__unit--jade { background: linear-gradient(180deg, rgba(79, 179, 166, 0.14), var(--ink-2)); }
.page-about .about-team__unit--amber { background: linear-gradient(180deg, rgba(242, 169, 59, 0.14), var(--ink-2)); }

.page-about .about-team__name {
  font-family: var(--font-cond);
  font-size: 1.15rem;
  letter-spacing: 0.03em;
  color: var(--stone);
  margin: 0 0 10px;
}

.page-about .about-team__text {
  font-size: 0.94rem;
  line-height: 1.78;
  color: var(--silver);
  margin: 0;
}

/* ---------- 协作生态 ---------- */
.page-about .about-net {
  display: grid;
  gap: clamp(26px, 4vw, 48px);
  align-items: start;
  margin-top: clamp(20px, 3vw, 32px);
}

.page-about .about-net__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-net__list li {
  padding: 16px 0 16px 18px;
  border-bottom: 1px solid var(--line);
}

.page-about .about-net__name {
  font-family: var(--font-cond);
  font-size: 1.05rem;
  letter-spacing: 0.03em;
  color: var(--stone);
  margin: 0 0 6px;
}

.page-about .about-net__list p {
  font-size: 0.92rem;
  line-height: 1.75;
  color: var(--silver);
  margin: 0;
}

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

.page-about .about-net__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border-radius: var(--radius-lg);
  opacity: 0.9;
}

/* ---------- 体验标准 ---------- */
.page-about .about-std__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px 18px;
  list-style: none;
  margin: clamp(24px, 4vw, 38px) 0;
  padding: 0;
}

.page-about .about-std__facts li {
  padding-top: 14px;
  border-top: 1px solid var(--line);
}

.page-about .about-std__note p {
  max-width: var(--w-text);
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--silver);
  margin: 0 0 16px;
}

.page-about .about-next {
  margin-top: clamp(32px, 5vw, 56px);
  padding-top: 24px;
  border-top: 1px solid var(--line-strong);
}

.page-about .about-next__title {
  font-family: var(--font-cond);
  font-size: 1.1rem;
  letter-spacing: 0.06em;
  color: var(--gold);
  margin: 0 0 16px;
}

.page-about .about-next__links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-next__link {
  display: block;
  padding: 14px 18px;
  border-radius: var(--radius);
  background: rgba(27, 53, 87, 0.6);
  color: var(--stone);
  text-decoration: none;
  font-size: 0.95rem;
  line-height: 1.6;
  transition: background 0.25s ease, color 0.25s ease;
}

.page-about .about-next__link:hover,
.page-about .about-next__link:focus-visible {
  background: rgba(242, 169, 59, 0.16);
  color: var(--stone);
}

.page-about .about-next__step {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--amber);
  margin-bottom: 4px;
}

/* ---------- 断点 ---------- */
@media (min-width: 720px) {
  .page-about .about-clusters {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

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

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

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  }

  .page-about .about-axis {
    grid-template-columns: 148px minmax(0, 1fr);
  }

  .page-about .about-axis__nav {
    display: block;
    position: sticky;
    top: 108px;
    align-self: start;
  }

  .page-about .about-net {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  }

  .page-about .about-breath__inner {
    padding-left: clamp(24px, 8vw, 120px);
  }
}

@media (min-width: 1040px) {
  .page-about .about-clusters {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-cluster:nth-child(2n) {
    transform: translateY(20px);
  }

  .page-about .about-vow__item--offset {
    transform: translateY(18px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-hero__glow {
    animation: none;
    opacity: 0.45;
  }

  .page-about .about-cluster:nth-child(2n),
  .page-about .about-vow__item--offset {
    transform: none;
  }

  .page-about .about-axis__link,
  .page-about .about-next__link {
    transition: none;
  }
}