.page-about {
  --rail-w: 84px;
  --rail-line: rgba(61, 220, 151, 0.32);
  --body-ink: #DCE4F2;
  position: relative;
}

/* ---------- 刊头 ---------- */
.page-about .about-masthead {
  padding: clamp(26px, 5vw, 60px) 0 clamp(34px, 6vw, 78px);
  background:
    radial-gradient(circle at 84% 14%, rgba(61, 220, 151, 0.12), transparent 46%),
    radial-gradient(circle at 8% 92%, rgba(124, 107, 255, 0.1), transparent 44%),
    linear-gradient(180deg, var(--ink) 0%, var(--ink-2) 100%);
  border-bottom: 2px solid var(--edge);
}

.page-about .about-masthead__shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 52px);
  align-items: center;
}

.page-about .about-kicker {
  margin: 14px 0 12px;
  font-size: 13px;
  letter-spacing: 0.28em;
  color: var(--amber);
}

.page-about .about-title {
  margin: 0 0 20px;
  max-width: 22ch;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(30px, 6.4vw, 58px);
  line-height: 1.1;
  letter-spacing: -0.022em;
  color: var(--paper);
}

.page-about .about-lede {
  margin: 0 0 26px;
  max-width: 58ch;
  color: var(--body-ink);
  font-size: clamp(16px, 1.6vw, 17px);
}

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

.page-about .about-stamp {
  margin: 20px 0 0;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--mist);
}

.page-about .about-masthead__figure {
  margin: 0;
  border: 2px solid var(--edge);
  background: var(--ink-3);
  box-shadow: var(--shadow);
  transform: rotate(-1.2deg);
}

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

/* ---------- 时间轴章节 ---------- */
.page-about .about-stage {
  padding: clamp(34px, 5.5vw, 74px) 0;
  border-bottom: 1px solid var(--edge);
}

.page-about .about-stage__shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
}

.page-about .about-stage__rail {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding-left: 30px;
}

.page-about .about-stage__rail::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 4px;
  bottom: -34px;
  width: 2px;
  background: linear-gradient(180deg, var(--rail-line), rgba(61, 220, 151, 0.05));
}

.page-about .about-stage:last-of-type .about-stage__rail::before {
  bottom: 6px;
}

.page-about .about-stage__node {
  position: absolute;
  left: 0;
  top: 4px;
  width: 16px;
  height: 16px;
  border: 2px solid var(--green);
  border-radius: 50%;
  background: var(--ink);
  box-shadow: 0 0 0 5px rgba(61, 220, 151, 0.1);
}

.page-about .about-stage__num {
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--amber);
}

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

.page-about .about-stage__body .section__title {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(24px, 3.8vw, 38px);
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .about-p {
  margin: 0 0 16px;
  max-width: 64ch;
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.8;
  color: var(--body-ink);
}

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

/* ---------- 阶段卡片 ---------- */
.page-about .about-phases {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .about-phase {
  border: 2px solid var(--edge);
  background: var(--ink-2);
  padding: 18px 20px 20px;
  box-shadow: var(--shadow-sm);
}

.page-about .about-phase__tag {
  display: inline-block;
  margin-bottom: 12px;
  padding: 2px 9px;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--green);
  border: 1px solid rgba(61, 220, 151, 0.42);
}

.page-about .about-phase__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18px;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-phase__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--mist);
}

/* ---------- 额度对照横展区 ---------- */
.page-about .about-ledger-section {
  padding: clamp(38px, 6vw, 84px) 0;
  background: linear-gradient(180deg, var(--ink-2) 0%, var(--ink) 100%);
  border-top: 2px solid var(--edge);
  border-bottom: 2px solid var(--edge);
}

.page-about .about-ledger__head {
  max-width: 76ch;
  margin-bottom: clamp(24px, 3.6vw, 42px);
}

.page-about .about-ledger__head .section__index {
  margin: 0 0 12px;
  font-size: 13px;
  letter-spacing: 0.2em;
  color: var(--violet);
}

.page-about .about-ledger__head .section__title {
  margin: 0 0 16px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(24px, 3.8vw, 38px);
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .about-ledger__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3.4vw, 38px);
  align-items: start;
}

.page-about .about-ledger__figure {
  margin: 0;
  border: 2px solid var(--edge);
  background: var(--ink-3);
  box-shadow: var(--shadow);
}

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

.page-about .about-ledger__scroll {
  border: 2px solid var(--edge);
  background: var(--ink-3);
  box-shadow: var(--shadow);
}

.page-about .about-ledger {
  width: 100%;
  min-width: 540px;
  border-collapse: collapse;
}

.page-about .about-ledger__caption {
  caption-side: top;
  text-align: left;
  padding: 14px 16px 10px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.05em;
  color: var(--amber);
}

.page-about .about-ledger th,
.page-about .about-ledger td {
  border: 1px solid var(--edge);
  padding: 12px 14px;
  text-align: left;
  font-size: 14px;
  line-height: 1.5;
  color: var(--body-ink);
}

.page-about .about-ledger thead th {
  background: rgba(6, 11, 24, 0.6);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--amber);
}

.page-about .about-ledger tbody th {
  font-family: var(--font-body);
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-ledger .num {
  font-family: var(--font-mono);
  color: var(--green);
  white-space: nowrap;
}

.page-about .about-fold {
  margin-top: 24px;
  border: 2px solid var(--edge);
  background: var(--ink-3);
  box-shadow: var(--shadow-sm);
}

.page-about .about-fold .fold__summary {
  padding: 15px 18px;
  cursor: pointer;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 15px;
  color: var(--amber);
  letter-spacing: 0.02em;
}

.page-about .about-fold .fold__body {
  padding: 0 18px 20px;
  font-size: 15px;
  line-height: 1.78;
  color: var(--mist);
}

.page-about .about-fold .fold__body p {
  margin: 0;
  max-width: 68ch;
}

/* ---------- 团队 ---------- */
.page-about .about-team__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3.4vw, 34px);
  align-items: start;
  margin-top: 26px;
}

.page-about .about-roles {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .about-role {
  position: relative;
  border: 2px solid var(--edge);
  background: var(--ink-3);
  padding: 16px 18px 22px;
  overflow: hidden;
}

.page-about .about-role::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  height: 4px;
}

.page-about .about-role:nth-child(1)::after {
  width: 33.34%;
  background: var(--green);
}

.page-about .about-role:nth-child(2)::after {
  width: 22.22%;
  background: var(--amber);
}

.page-about .about-role:nth-child(3)::after {
  width: 22.22%;
  background: var(--violet);
}

.page-about .about-role:nth-child(4)::after {
  width: 22.22%;
  background: var(--green-deep);
}

.page-about .about-role__num {
  display: block;
  margin-bottom: 8px;
  font-size: 28px;
  line-height: 1;
  color: var(--paper);
}

.page-about .about-role__name {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 16px;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-role__desc {
  display: block;
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .about-team__figure {
  margin: 0;
  border: 2px solid var(--edge);
  background: var(--ink-3);
  box-shadow: var(--shadow);
}

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

/* ---------- 服务主张清单 ---------- */
.page-about .about-claim {
  padding: clamp(40px, 6vw, 84px) 0;
  background: var(--ink-2);
  border-top: 2px solid var(--edge);
  border-bottom: 2px solid var(--edge);
}

.page-about .about-claim .section__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(24px, 3.8vw, 38px);
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .about-claim__list {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  border-top: 2px solid var(--edge);
}

.page-about .about-claim__item {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 8px;
  padding: 20px 0;
  border-bottom: 1px solid var(--edge);
}

.page-about .about-claim__name {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 19px;
  letter-spacing: -0.01em;
  color: var(--green);
}

.page-about .about-claim__text {
  margin: 0;
  max-width: 70ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--body-ink);
}

/* ---------- 收束 ---------- */
.page-about .about-close {
  padding: clamp(44px, 7vw, 96px) 0;
  background:
    radial-gradient(circle at 18% 30%, rgba(242, 178, 76, 0.1), transparent 52%),
    radial-gradient(circle at 88% 78%, rgba(61, 220, 151, 0.09), transparent 50%),
    var(--ink);
}

.page-about .about-close__shell {
  max-width: 800px;
}

.page-about .about-close__line {
  margin: 0 0 16px;
  font-family: var(--font-editorial);
  font-weight: 600;
  font-size: clamp(26px, 4.6vw, 46px);
  line-height: 1.26;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-close__sub {
  margin: 0 0 28px;
  max-width: 56ch;
  font-size: 16px;
  line-height: 1.82;
  color: var(--mist);
}

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

/* ---------- 交互反馈 ---------- */
.page-about .about-masthead__figure:hover,
.page-about .about-ledger__figure:hover,
.page-about .about-team__figure:hover {
  border-color: var(--coral);
}

.page-about .about-phase:hover,
.page-about .about-role:hover {
  border-color: var(--coral);
  transform: translate(-2px, -2px);
}

.page-about .about-phase,
.page-about .about-role {
  transition: border-color 0.18s ease, transform 0.18s ease;
}

.page-about .about-masthead__figure,
.page-about .about-ledger__figure,
.page-about .about-team__figure {
  transition: border-color 0.2s ease;
}

.page-about a:focus-visible,
.page-about summary:focus-visible {
  outline: 2px solid var(--green);
  outline-offset: 3px;
}

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

  .page-about .about-phases > .about-phase:nth-child(even) {
    margin-top: 16px;
  }

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

  .page-about .about-claim__item {
    grid-template-columns: 150px minmax(0, 1fr);
    align-items: baseline;
    gap: 20px;
  }
}

@media (min-width: 900px) {
  .page-about {
    --rail-w: 92px;
  }

  .page-about .about-masthead__shell {
    grid-template-columns: minmax(0, 1.28fr) minmax(0, 1fr);
    gap: clamp(30px, 4vw, 56px);
  }

  .page-about .about-stage__shell {
    grid-template-columns: var(--rail-w) minmax(0, 1fr);
    gap: clamp(24px, 4vw, 54px);
  }

  .page-about .about-stage__rail {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
    padding-left: 26px;
  }

  .page-about .about-stage__rail::before {
    bottom: -74px;
  }

  .page-about .about-ledger__grid {
    grid-template-columns: minmax(0, 0.62fr) minmax(0, 1.38fr);
    gap: clamp(24px, 3.4vw, 42px);
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 1.32fr) minmax(0, 0.68fr);
    gap: clamp(24px, 3.4vw, 38px);
  }
}

@media (min-width: 1080px) {
  .page-about .about-ledger__grid {
    grid-template-columns: minmax(0, 0.55fr) minmax(0, 1.45fr);
  }

  .page-about .about-phases {
    margin-top: 34px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-phase,
  .page-about .about-role,
  .page-about .about-masthead__figure,
  .page-about .about-ledger__figure,
  .page-about .about-team__figure,
  .page-about [data-reveal] {
    transition: none !important;
    transform: none !important;
  }
}