.page-about {
  --ab-mark-w: 110px;
  --ab-rail-w: 40px;
  --ab-rail-gap: 24px;
  color: var(--fog);
  overflow-x: clip;
}

.page-about img {
  max-width: 100%;
  height: auto;
  display: block;
}

.page-about .ab-p {
  margin: 0 0 1.2em;
  font-size: 16px;
  line-height: 1.8;
  color: var(--fog);
  max-width: 66ch;
}

.page-about .ab-lead {
  margin: 0 0 28px;
  font-size: clamp(16px, 1.4vw, 18px);
  line-height: 1.8;
  color: var(--fog);
  max-width: 62ch;
}

.page-about .ab-lead--wide {
  max-width: 74ch;
  margin-bottom: clamp(28px, 4vw, 48px);
}

/* ---------- HERO ---------- */

.page-about .ab-hero {
  position: relative;
  padding: clamp(40px, 7vw, 96px) 0 0;
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  top: -200px;
  right: -140px;
  width: min(760px, 84vw);
  height: min(760px, 84vw);
  background: radial-gradient(circle at 50% 50%, rgba(198, 255, 61, 0.11), rgba(198, 255, 61, 0) 62%);
  pointer-events: none;
}

.page-about .ab-hero-inner {
  position: relative;
  z-index: 1;
}

.page-about .ab-hero .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-bottom: 28px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--ash);
}

.page-about .ab-hero .breadcrumb a {
  color: var(--ash);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.18s ease, border-color 0.18s ease;
}

.page-about .ab-hero .breadcrumb a:hover {
  color: var(--lime);
  border-bottom-color: var(--lime);
}

.page-about .ab-hero .breadcrumb [aria-current="page"] {
  color: var(--fog);
}

.page-about .ab-kicker {
  margin: 0 0 20px;
  color: var(--lime);
}

.page-about .ab-title {
  margin: 0 0 26px;
  max-width: 15ch;
}

.page-about .ab-title b {
  font-weight: 800;
  color: var(--lime);
}

.page-about .ab-lede {
  max-width: 62ch;
  color: var(--fog);
  font-size: clamp(16px, 1.4vw, 19px);
  line-height: 1.8;
}

.page-about .ab-hero-actions {
  margin-top: 34px;
}

.page-about .ab-hero-media {
  width: calc(100% - var(--pad) * 2);
  max-width: var(--wrap);
  margin: clamp(40px, 6vw, 76px) auto 0;
}

/* ---------- 章节头 ---------- */

.page-about .chapter {
  margin-bottom: clamp(32px, 5vw, 56px);
}

.page-about .chapter-title {
  max-width: 22ch;
}

/* ---------- 01 品牌主张 ---------- */

.page-about .ab-creed {
  padding-top: clamp(80px, 12vw, 152px);
}

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

.page-about .ab-creed-card {
  padding: clamp(24px, 3vw, 34px);
}

.page-about .ab-creed-card-title {
  margin: 0 0 22px;
  color: var(--lime);
}

.page-about .ab-facts {
  margin: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
}

.page-about .ab-fact {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 0;
  background: var(--panel);
}

.page-about .ab-fact dt {
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--ash);
}

.page-about .ab-fact dd {
  margin: 0;
  font-size: clamp(22px, 2.4vw, 30px);
  color: var(--white);
  line-height: 1;
}

/* ---------- 02 时间轴 ---------- */

.page-about .ab-timeline {
  padding-top: clamp(80px, 12vw, 152px);
}

.page-about .tl-wrap {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 36px;
}

.page-about .tl-index-title {
  margin: 0 0 16px;
  color: var(--ash);
}

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

.page-about .tl-index-list a {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 12px;
  border: 1px solid var(--line);
  color: var(--ash);
  text-decoration: none;
  font-size: 13px;
  transition: color 0.18s ease, border-color 0.18s ease, background-color 0.18s ease;
}

.page-about .tl-index-list a .t-mono {
  color: var(--lime-dim);
  font-size: 12px;
}

.page-about .tl-index-list a em {
  font-style: normal;
}

.page-about .tl-index-list a:hover,
.page-about .tl-index-list a:focus-visible {
  color: var(--lime);
  border-color: var(--lime);
  background: rgba(198, 255, 61, 0.06);
}

.page-about .tl-index-list a:hover .t-mono,
.page-about .tl-index-list a:focus-visible .t-mono {
  color: var(--lime);
}

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

.page-about .tl-node {
  position: relative;
  padding: 0 0 clamp(72px, 11vw, 156px) calc(var(--ab-mark-w) + var(--ab-rail-w) + var(--ab-rail-gap));
}

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

.page-about .tl-mark {
  position: absolute;
  left: 0;
  top: 0;
  width: var(--ab-mark-w);
  text-align: right;
}

.page-about .tl-year {
  display: block;
  font-size: clamp(26px, 3.6vw, 48px);
  line-height: 1;
  color: var(--white);
  letter-spacing: -0.01em;
  transition: color 0.18s ease;
}

.page-about .tl-ver {
  display: block;
  margin-top: 10px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--lime);
}

.page-about .tl-rail {
  position: absolute;
  top: 0;
  bottom: 0;
  left: calc(var(--ab-mark-w) + var(--ab-rail-gap));
  width: var(--ab-rail-w);
}

.page-about .tl-line {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  overflow: visible;
  fill: none;
  stroke: var(--line);
  stroke-width: 1.5;
}

.page-about .tl-dot {
  position: absolute;
  top: 20px;
  left: 50%;
  width: 12px;
  height: 12px;
  margin: -6px 0 0 -6px;
  border-radius: 50%;
  background: var(--lime);
  box-shadow: 0 0 0 5px rgba(198, 255, 61, 0.13);
  transition: transform 0.18s ease, background-color 0.18s ease;
}

.page-about .tl-node:hover .tl-dot,
.page-about .tl-node:focus-within .tl-dot {
  transform: scale(1.4);
  background: var(--white);
}

.page-about .tl-node:hover .tl-year,
.page-about .tl-node:focus-within .tl-year {
  color: var(--lime);
}

.page-about .tl-body h3 {
  margin: 0 0 14px;
}

.page-about .tl-body > p {
  margin: 0 0 14px;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--fog);
}

.page-about .tl-note {
  margin: 0;
  max-width: 56ch;
  padding-left: 16px;
  border-left: 1px solid var(--line);
  font-size: 14px;
  font-weight: 300;
  line-height: 1.75;
  color: var(--ash);
}

.page-about .tl-fig {
  margin: 28px 0 0;
  max-width: 640px;
}

/* ---------- 03 团队 ---------- */

.page-about .ab-team {
  padding-top: clamp(80px, 12vw, 152px);
}

.page-about .ab-team-list {
  margin-top: 8px;
  display: grid;
  gap: 12px;
}

.page-about .ab-team-card {
  position: relative;
  padding: 20px 44px 20px 24px;
  background: linear-gradient(180deg, rgba(22, 51, 42, 0.72), rgba(14, 31, 26, 0.35));
  clip-path: polygon(0 0, calc(100% - 14px) 0, 100% 14px, 100% 100%, 0 100%);
  transition: background-color 0.18s ease;
}

.page-about .ab-team-card::before {
  content: "";
  position: absolute;
  inset: 0;
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  pointer-events: none;
  transition: border-color 0.18s ease;
}

.page-about .ab-team-card:hover::before,
.page-about .ab-team-card[open]::before {
  border-color: var(--lime-dim);
}

.page-about .ab-team-card:hover {
  background: linear-gradient(180deg, rgba(22, 51, 42, 0.95), rgba(14, 31, 26, 0.5));
}

.page-about .ab-team-sum {
  display: flex;
  align-items: baseline;
  gap: 14px;
  cursor: pointer;
  list-style: none;
  font-size: 18px;
  color: var(--white);
}

.page-about .ab-team-sum::-webkit-details-marker {
  display: none;
}

.page-about .ab-team-sum::after {
  content: "＋";
  margin-left: auto;
  color: var(--lime);
  font-size: 16px;
  font-family: var(--mono);
}

.page-about .ab-team-card[open] .ab-team-sum::after {
  content: "－";
}

.page-about .ab-team-no {
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--lime-dim);
}

.page-about .ab-team-name {
  font-weight: 700;
  letter-spacing: 0.02em;
}

.page-about .ab-team-panel {
  padding-top: 12px;
}

.page-about .ab-team-panel p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ash);
  max-width: 56ch;
}

.page-about .ab-team-aside {
  margin-top: 32px;
}

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

.page-about .ab-team-side .t-index {
  margin: 0 0 12px;
  color: var(--ash);
}

.page-about .ab-team-stat {
  margin: 0;
  font-size: clamp(40px, 6vw, 64px);
  line-height: 1;
  color: var(--lime);
}

.page-about .ab-team-side-note {
  margin: 14px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--ash);
  max-width: 40ch;
}

/* ---------- 04 生态 ---------- */

.page-about .ab-eco {
  padding-top: clamp(80px, 12vw, 152px);
}

.page-about .ab-eco-grid {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .ab-eco-card {
  padding: clamp(24px, 3.4vw, 44px);
  background: var(--moss);
  transition: background-color 0.2s ease;
}

.page-about .ab-eco-card:hover {
  background: var(--panel);
}

.page-about .ab-eco-num {
  margin: 0 0 14px;
  font-size: clamp(44px, 6vw, 76px);
  line-height: 1;
  color: var(--lime);
}

.page-about .ab-eco-card h3 {
  margin: 0 0 12px;
}

.page-about .ab-eco-card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ash);
}

/* ---------- 05 校验 ---------- */

.page-about .ab-check {
  padding-top: clamp(80px, 12vw, 152px);
}

.page-about .ab-check-wrap {
  display: grid;
  gap: clamp(28px, 4vw, 48px);
}

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

.page-about .ab-check-item {
  display: grid;
  gap: 10px;
  padding: clamp(22px, 3vw, 34px) 0;
  border-top: 1px solid var(--line);
}

.page-about .ab-check-item:last-child {
  border-bottom: 1px solid var(--line);
}

.page-about .ab-check-no {
  font-size: 20px;
  color: var(--lime-dim);
}

.page-about .ab-check-item h3 {
  margin: 0 0 10px;
}

.page-about .ab-check-item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ash);
  max-width: 64ch;
}

.page-about .ab-fix {
  padding: clamp(24px, 3vw, 36px);
}

.page-about .ab-fix .t-index {
  margin: 0 0 14px;
  color: var(--lime);
}

.page-about .ab-fix-text {
  margin: 0 0 22px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--fog);
}

/* ---------- 06 合作 ---------- */

.page-about .ab-coop {
  padding-top: clamp(80px, 12vw, 152px);
}

.page-about .ab-coop-wrap {
  display: grid;
  gap: clamp(30px, 4vw, 56px);
}

.page-about .ab-coop-intro .note {
  margin: 0;
  max-width: 44ch;
}

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

.page-about .ab-coop-item {
  display: grid;
  gap: 10px;
  padding: clamp(20px, 3vw, 30px) 0;
  border-top: 1px solid var(--line);
}

.page-about .ab-coop-item:last-child {
  border-bottom: 1px solid var(--line);
}

.page-about .ab-coop-no {
  font-size: 13px;
  letter-spacing: 0.16em;
  color: var(--lime);
}

.page-about .ab-coop-item h3 {
  margin: 0;
}

.page-about .ab-coop-item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ash);
  max-width: 58ch;
}

/* ---------- 收尾 ---------- */

.page-about .ab-end {
  padding-top: clamp(80px, 12vw, 152px);
}

.page-about .ab-end-panel {
  position: relative;
  padding: clamp(32px, 5vw, 68px);
  background: linear-gradient(135deg, rgba(22, 51, 42, 0.95), rgba(7, 11, 10, 0.6) 70%);
  border-left: 2px solid var(--lime);
  clip-path: polygon(0 0, calc(100% - 22px) 0, 100% 22px, 100% 100%, 0 100%);
}

.page-about .ab-end-kicker {
  margin: 0 0 18px;
  color: var(--lime);
}

.page-about .ab-end-title {
  margin: 0 0 18px;
  max-width: 20ch;
}

.page-about .ab-end-text {
  margin: 0 0 28px;
  max-width: 58ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--ash);
}

/* ---------- 响应式 ---------- */

@media (max-width: 900px) {
  .page-about .tl-node {
    padding-left: 52px;
    padding-bottom: clamp(56px, 9vw, 96px);
  }

  .page-about .tl-mark {
    position: static;
    width: auto;
    text-align: left;
    margin-bottom: 12px;
  }

  .page-about .tl-year {
    display: inline-block;
    margin-right: 12px;
  }

  .page-about .tl-ver {
    display: inline-block;
    margin-top: 0;
  }

  .page-about .tl-rail {
    left: 10px;
    width: 24px;
  }

  .page-about .tl-dot {
    top: 22px;
    width: 10px;
    height: 10px;
    margin: -5px 0 0 -5px;
  }

  .page-about .ab-team-aside {
    margin-top: 8px;
  }
}

@media (min-width: 760px) {
  .page-about .ab-check-item {
    grid-template-columns: 64px minmax(0, 1fr);
    align-items: start;
  }

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

  .page-about .ab-coop-item {
    grid-template-columns: 64px minmax(0, 1fr);
    align-items: baseline;
    column-gap: 12px;
  }

  .page-about .ab-coop-item p {
    grid-column: 2;
  }
}

@media (min-width: 1024px) {
  .page-about .tl-wrap {
    grid-template-columns: minmax(0, 1fr) 180px;
    gap: 52px;
  }

  .page-about .tl-index {
    grid-column: 2;
    grid-row: 1;
    position: sticky;
    top: calc(var(--header-h) + 32px);
    align-self: start;
  }

  .page-about .tl {
    grid-column: 1;
    grid-row: 1;
  }

  .page-about .tl-index-list {
    flex-direction: column;
    gap: 1px;
    background: var(--line);
  }

  .page-about .tl-index-list li {
    background: var(--ink);
  }

  .page-about .tl-index-list a {
    border-color: transparent;
    width: 100%;
    justify-content: space-between;
  }

  .page-about .ab-check-wrap {
    grid-template-columns: minmax(0, 1fr) 340px;
    align-items: start;
  }

  .page-about .ab-fix {
    position: sticky;
    top: calc(var(--header-h) + 32px);
  }

  .page-about .ab-coop-wrap {
    grid-template-columns: 320px minmax(0, 1fr);
    align-items: start;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .tl-dot,
  .page-about .tl-year,
  .page-about .ab-team-card,
  .page-about .tl-index-list a {
    transition: none;
  }

  .page-about .tl-node:hover .tl-dot,
  .page-about .tl-node:focus-within .tl-dot {
    transform: none;
  }
}