.page-about {
  --ab-line: 1px solid var(--line);
  --ab-pad: clamp(16px, 4vw, 40px);
  background: var(--ink-900);
  color: var(--text);
  font-family: var(--font-body);
}

.page-about .about-wrap {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--ab-pad);
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumb {
  padding-top: clamp(16px, 3vw, 28px);
  font-family: var(--font-data);
  font-size: 0.76rem;
  letter-spacing: 0.05em;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding-block: clamp(22px, 4vw, 40px) clamp(38px, 6vw, 72px);
  border-bottom: var(--ab-line);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  z-index: -1;
  top: -24%;
  right: -20%;
  width: 66%;
  height: 150%;
  background: linear-gradient(155deg, rgba(45, 226, 230, 0.13), rgba(107, 111, 138, 0.06) 52%, transparent 78%);
  clip-path: polygon(34% 0, 100% 0, 100% 100%, 0 100%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--cyan), rgba(45, 226, 230, 0) 52%, var(--orange));
  opacity: 0.55;
  pointer-events: none;
}

.page-about .about-hero__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 42px);
  align-items: center;
}

.page-about .about-hero__tag {
  display: inline-block;
  margin: 0 0 16px;
  padding: 5px 12px;
  border: 1px solid rgba(45, 226, 230, 0.34);
  background: rgba(45, 226, 230, 0.07);
  color: var(--cyan);
  font-family: var(--font-data);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
}

.page-about .about-hero h1 {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(1.82rem, 5vw, 3.05rem);
  line-height: 1.14;
  letter-spacing: 0.015em;
  color: var(--text);
}

.page-about .about-hero__lead {
  max-width: 40em;
  margin: 16px 0 0;
  color: var(--text-2);
  font-size: clamp(0.94rem, 1.5vw, 1.02rem);
  line-height: 1.85;
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px 12px;
  margin: 26px 0 0;
  padding: 0;
}

.page-about .about-hero__stats > div {
  padding-left: 12px;
  border-left: 2px solid var(--line-hi);
}

.page-about .about-hero__stats > div:nth-child(2) {
  border-left-color: rgba(45, 226, 230, 0.6);
}

.page-about .about-hero__stats > div:nth-child(3) {
  border-left-color: rgba(255, 107, 53, 0.6);
}

.page-about .stat__label {
  display: block;
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  color: var(--text-2);
}

.page-about .stat__value {
  display: block;
  margin: 4px 0 0;
  font-family: var(--font-data);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.12rem, 2.4vw, 1.45rem);
  color: var(--cyan);
  letter-spacing: 0.01em;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 26px;
}

/* ---------- 占位图容器 ---------- */
.page-about .ab-figure {
  margin: 0;
  border: 1px solid var(--line);
  background: linear-gradient(150deg, var(--panel) 0%, var(--ink-850) 100%);
}

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

.page-about .ab-figure__cap {
  border-top: 1px solid var(--line);
  padding: 9px 14px;
  color: var(--text-2);
  font-size: 0.76rem;
  line-height: 1.6;
}

.page-about .about-hero__figure {
  order: -1;
}

/* ---------- 章节 ---------- */
.page-about .chapter {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  padding-block: clamp(32px, 5.5vw, 66px);
  border-top: var(--ab-line);
}

.page-about .chapter__rail {
  display: flex;
  align-items: center;
  gap: 12px;
}

.page-about .chapter__num {
  font-family: var(--font-data);
  font-variant-numeric: tabular-nums;
  font-size: 1.02rem;
  letter-spacing: 0.14em;
  color: var(--cyan);
}

.page-about .chapter__kicker {
  margin: 0 0 8px;
  font-family: var(--font-data);
  font-size: 0.73rem;
  letter-spacing: 0.16em;
  color: var(--orange);
}

.page-about .chapter h2 {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(1.34rem, 3vw, 1.98rem);
  line-height: 1.26;
  letter-spacing: 0.012em;
  color: var(--text);
}

.page-about .chapter__lead {
  max-width: 46em;
  margin: 14px 0 0;
  color: var(--text-2);
  font-size: 0.96rem;
  line-height: 1.85;
}

.page-about .chapter__body > p {
  max-width: 46em;
  margin: 14px 0 0;
  color: var(--text-2);
  font-size: 0.94rem;
  line-height: 1.85;
}

.page-about .chapter__body a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(45, 226, 230, 0.4);
}

.page-about .chapter__body a:hover {
  color: var(--text);
  border-bottom-color: var(--text);
}

.page-about .chapter__note {
  max-width: 42em;
  margin: 22px 0 0;
  padding: 10px 0 10px 14px;
  border-left: 2px solid rgba(255, 107, 53, 0.55);
  color: var(--text-2);
  font-size: 0.85rem;
  line-height: 1.78;
}

.page-about .chapter--panel .chapter__body {
  border: 1px solid var(--line);
  background: var(--panel);
  padding: clamp(16px, 3vw, 30px);
}

.page-about .chapter--panel .chapter__note {
  border-left-color: rgba(45, 226, 230, 0.55);
}

.page-about .chapter__body .ab-figure {
  margin-top: clamp(20px, 3vw, 30px);
}

/* ---------- 四步流程 ---------- */
.page-about .flow {
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .flow__step {
  position: relative;
  padding: 0 0 26px 52px;
}

.page-about .flow__step:last-child {
  padding-bottom: 0;
}

.page-about .flow__step:not(:last-child)::before {
  content: "";
  position: absolute;
  left: 15px;
  top: 32px;
  bottom: 2px;
  width: 2px;
  background: linear-gradient(180deg, rgba(45, 226, 230, 0.5), rgba(45, 226, 230, 0.06));
}

.page-about .flow__dot {
  position: absolute;
  left: 0;
  top: 0;
  display: grid;
  place-items: center;
  width: 32px;
  height: 32px;
  border: 1px solid rgba(45, 226, 230, 0.45);
  background: var(--ink-850);
  color: var(--cyan);
  font-family: var(--font-data);
  font-variant-numeric: tabular-nums;
  font-size: 0.72rem;
}

.page-about .flow__step:last-child .flow__dot {
  border-color: rgba(255, 107, 53, 0.5);
  color: var(--orange);
}

.page-about .flow__step h3 {
  margin: 4px 0 0;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1.02rem;
  letter-spacing: 0.02em;
  color: var(--text);
}

.page-about .flow__step p {
  max-width: 44em;
  margin: 8px 0 0;
  color: var(--text-2);
  font-size: 0.91rem;
  line-height: 1.8;
}

.page-about .flow__out {
  display: inline-block;
  margin-top: 10px;
  padding: 3px 9px;
  border: 1px solid var(--line-hi);
  color: var(--text-2);
  font-size: 0.72rem;
  letter-spacing: 0.03em;
}

/* ---------- 团队卡片 ---------- */
.page-about .team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .team-card {
  border: 1px solid var(--line);
  background: linear-gradient(180deg, var(--panel) 0%, var(--ink-850) 100%);
  padding: 18px 16px 20px;
  transition: border-color 0.2s var(--ease), box-shadow 0.2s var(--ease), transform 0.2s var(--ease);
}

.page-about .team-card:hover {
  border-color: rgba(45, 226, 230, 0.45);
  box-shadow: var(--glow-cyan);
  transform: translateY(-2px);
}

.page-about .team-card__idx {
  display: inline-block;
  margin-bottom: 10px;
  font-family: var(--font-data);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: rgba(45, 226, 230, 0.8);
}

.page-about .team-card__role {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1rem;
  color: var(--text);
}

.page-about .team-card__desc {
  margin: 8px 0 0;
  color: var(--text-2);
  font-size: 0.88rem;
  line-height: 1.78;
}

/* ---------- 协作数据 ---------- */
.page-about .collab {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .collab__item {
  border-top: 2px solid var(--line-hi);
  padding-top: 14px;
}

.page-about .collab__item:nth-child(2) {
  border-top-color: rgba(45, 226, 230, 0.6);
}

.page-about .collab__item:nth-child(3) {
  border-top-color: rgba(255, 107, 53, 0.6);
}

.page-about .collab__num {
  display: block;
  font-family: var(--font-data);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.35rem, 3vw, 1.85rem);
  letter-spacing: 0.01em;
  color: var(--text);
}

.page-about .collab__label {
  display: block;
  margin-top: 6px;
  color: var(--text-2);
  font-size: 0.8rem;
  line-height: 1.7;
}

/* ---------- 时间线 ---------- */
.page-about .timeline {
  position: relative;
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: linear-gradient(180deg, var(--cyan) 0%, rgba(45, 226, 230, 0.18) 55%, var(--orange) 100%);
}

.page-about .tl-item {
  position: relative;
  padding-left: 34px;
  margin-bottom: 12px;
}

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

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 17px;
  width: 10px;
  height: 10px;
  border: 2px solid var(--cyan);
  border-radius: 50%;
  background: var(--ink-900);
  box-shadow: 0 0 0 3px rgba(45, 226, 230, 0.12);
}

.page-about .tl-item:last-child::before {
  border-color: var(--orange);
  box-shadow: 0 0 0 3px rgba(255, 107, 53, 0.14);
}

.page-about .tl-node {
  border: 1px solid var(--line);
  background: var(--ink-850);
  transition: border-color 0.2s var(--ease);
}

.page-about .tl-node:hover {
  border-color: var(--line-hi);
}

.page-about .tl-node summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 12px;
  padding: 12px 14px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .tl-node summary::after {
  content: "+";
  margin-left: auto;
  padding-left: 8px;
  font-family: var(--font-data);
  font-size: 0.95rem;
  line-height: 1;
  color: var(--cyan);
}

.page-about .tl-node[open] summary::after {
  content: "\2212";
  color: var(--orange);
}

.page-about .tl-node__year {
  font-family: var(--font-data);
  font-variant-numeric: tabular-nums;
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  color: var(--orange);
}

.page-about .tl-node__title {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 0.96rem;
  line-height: 1.45;
  color: var(--text);
}

.page-about .tl-node__body {
  padding: 0 14px 15px;
}

.page-about .tl-node__body p {
  margin: 12px 0 0;
  padding-top: 12px;
  border-top: 1px solid var(--line);
  color: var(--text-2);
  font-size: 0.89rem;
  line-height: 1.8;
}

/* ---------- 服务对象 ---------- */
.page-about .audience-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .audience-card {
  position: relative;
  display: flex;
  flex-direction: column;
  border: 1px solid var(--line);
  background: var(--panel);
  padding: 20px 18px 20px 22px;
}

.page-about .audience-card::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 3px;
  background: var(--cyan);
}

.page-about .audience-card:nth-child(2)::before {
  background: var(--orange);
}

.page-about .audience-card:nth-child(3)::before {
  background: var(--green);
}

.page-about .audience-card h3 {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1rem;
  color: var(--text);
}

.page-about .audience-card p {
  margin: 0 0 16px;
  color: var(--text-2);
  font-size: 0.88rem;
  line-height: 1.78;
}

.page-about .audience-card__link {
  margin-top: auto;
  align-self: flex-start;
  padding-bottom: 2px;
  border-bottom: 1px solid rgba(45, 226, 230, 0.4);
  color: var(--cyan);
  font-family: var(--font-data);
  font-size: 0.76rem;
  letter-spacing: 0.05em;
  text-decoration: none;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.page-about .audience-card__link:hover {
  color: var(--text);
  border-bottom-color: var(--text);
}

/* ---------- 结尾 ---------- */
.page-about .closing {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
  margin-top: clamp(30px, 4.5vw, 54px);
  padding: clamp(20px, 3.5vw, 34px);
  border: 1px solid var(--line);
  border-left: 3px solid var(--orange);
  background: linear-gradient(120deg, var(--panel-hi) 0%, var(--ink-850) 72%);
}

.page-about .closing__text h2 {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(1.15rem, 2.4vw, 1.45rem);
  line-height: 1.3;
  color: var(--text);
}

.page-about .closing__text p {
  max-width: 46em;
  margin: 10px 0 0;
  color: var(--text-2);
  font-size: 0.9rem;
  line-height: 1.8;
}

.page-about .closing__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-content: start;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-about .collab {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 14px;
  }
}

@media (min-width: 780px) {
  .page-about .audience-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 920px) {
  .page-about .chapter {
    grid-template-columns: 88px minmax(0, 1fr);
    column-gap: clamp(16px, 2.4vw, 32px);
    row-gap: 0;
  }

  .page-about .chapter__rail {
    display: block;
    position: sticky;
    top: calc(var(--head-h) + 20px);
    align-self: start;
  }

  .page-about .chapter__rail::after {
    content: "";
    display: block;
    width: 1px;
    height: 52px;
    margin: 14px 0 0 6px;
    background: linear-gradient(180deg, rgba(45, 226, 230, 0.55), rgba(45, 226, 230, 0));
  }

  .page-about .chapter--panel .chapter__body {
    max-width: 100%;
  }
}

@media (min-width: 960px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: clamp(28px, 4vw, 52px);
  }

  .page-about .about-hero__figure {
    order: 0;
    align-self: stretch;
  }

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

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

@media (prefers-reduced-motion: reduce) {
  .page-about .team-card,
  .page-about .audience-card__link,
  .page-about .tl-node {
    transition: none;
  }

  .page-about .team-card:hover {
    transform: none;
  }
}