.page-about {
  --about-space: clamp(48px, 7vw, 96px);
  --about-line: 2px solid var(--line);
  background:
    radial-gradient(90% 55% at 92% -8%, rgba(53, 242, 194, .12), transparent 58%),
    var(--ink);
  color: var(--paper);
  padding-bottom: clamp(56px, 8vw, 104px);
  overflow-x: clip;
}

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

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

.page-about .crumbs {
  padding-top: clamp(14px, 2vw, 22px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: clamp(14px, 2.4vw, 28px) 0 clamp(30px, 4vw, 54px);
}

.page-about .about-hero__inner {
  display: grid;
  gap: clamp(28px, 4vw, 52px);
}

.page-about .about-hero__title {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(38px, 6.4vw, 84px);
  line-height: .98;
  letter-spacing: -.01em;
  margin: 10px 0 0;
  max-width: 15em;
}

.page-about .about-hero__title em {
  display: block;
  font-style: normal;
  color: var(--mint);
}

.page-about .about-hero__lead {
  margin: clamp(16px, 2vw, 24px) 0 0;
  max-width: 46ch;
  font-size: clamp(15px, 1.4vw, 18px);
  line-height: 1.75;
  color: var(--haze);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3vw, 32px);
}

.page-about .about-hero__visual {
  display: grid;
  gap: 0;
}

.page-about .about-hero__visual .media {
  border: var(--about-line);
  box-shadow: var(--shadow-block);
  background: var(--ink-deep);
}

.page-about .scale {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: var(--about-line);
}

.page-about .scale__item {
  background: var(--panel);
  padding: 12px 14px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .scale__ver {
  font-family: var(--font-num);
  font-size: 14px;
  letter-spacing: .04em;
  color: var(--mint);
}

.page-about .scale__text {
  font-size: 12.5px;
  letter-spacing: .08em;
  color: var(--muted);
}

/* ---------- 规模条 ---------- */
.page-about .about-facts {
  margin-top: clamp(8px, 2vw, 16px);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: var(--ink-deep);
}

.page-about .about-facts__grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
}

.page-about .fact {
  background: var(--ink-deep);
  padding: clamp(16px, 2.2vw, 26px) clamp(12px, 2vw, 20px);
  display: flex;
  flex-direction: column;
  gap: 8px;
  transition: background .2s ease;
}

.page-about .fact:hover,
.page-about .fact:focus-within {
  background: var(--panel);
}

.page-about .fact__value {
  font-family: var(--font-num);
  font-size: clamp(30px, 4vw, 46px);
  line-height: 1;
  color: var(--mint);
}

.page-about .fact__unit {
  font-size: .5em;
  margin-left: 2px;
  color: var(--mint-deep);
}

.page-about .fact__label {
  font-size: 13px;
  line-height: 1.5;
  color: var(--muted);
}

/* ---------- 通用区块 ---------- */
.page-about .about-block {
  padding: var(--about-space) 0 0;
}

.page-about .about-head {
  max-width: 62ch;
}

.page-about .about-head h2 {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(26px, 4vw, 50px);
  line-height: 1.02;
  margin: 8px 0 0;
}

.page-about .about-head__lead {
  margin: 14px 0 0;
  max-width: 52ch;
  font-size: clamp(15px, 1.3vw, 17px);
  line-height: 1.75;
  color: var(--haze);
}

/* ---------- 三条路径 ---------- */
.page-about .lanes {
  list-style: none;
  margin: clamp(24px, 3vw, 36px) 0 0;
  padding: 0;
  display: grid;
  gap: clamp(14px, 2vw, 20px);
}

.page-about .lane {
  border: var(--about-line);
  background: var(--panel);
  padding: clamp(18px, 2.4vw, 26px);
  box-shadow: var(--shadow-block-sm);
  transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease;
}

.page-about .lane:hover,
.page-about .lane:focus-within {
  transform: translateY(-4px);
  border-color: var(--mint-deep);
  box-shadow: 8px 8px 0 0 rgba(53, 242, 194, .22);
}

.page-about .lane__num {
  font-family: var(--font-num);
  font-size: 12.5px;
  letter-spacing: .18em;
  color: var(--mint);
}

.page-about .lane__title {
  font-family: var(--font-head);
  font-size: clamp(22px, 2.6vw, 30px);
  line-height: 1.05;
  margin: 10px 0 0;
}

.page-about .lane__text {
  margin: 12px 0 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--haze);
}

/* ---------- 版本时间轴 ---------- */
.page-about .about-vers__grid {
  display: grid;
  gap: clamp(28px, 4vw, 48px);
}

.page-about .link-more {
  display: inline-block;
  margin-top: 18px;
  padding-bottom: 3px;
  font-family: var(--font-num);
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--mint);
  text-decoration: none;
  border-bottom: 1px solid var(--mint-deep);
}

.page-about .link-more:hover {
  color: var(--paper);
  border-color: var(--paper);
}

.page-about .vers {
  list-style: none;
  margin: 0;
  padding: 0 0 0 26px;
  position: relative;
}

.page-about .vers::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: linear-gradient(var(--mint-deep), var(--line));
}

.page-about .ver {
  position: relative;
  padding-bottom: clamp(20px, 2.6vw, 30px);
}

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

.page-about .ver__node {
  position: absolute;
  left: -27px;
  top: 8px;
  width: 14px;
  height: 14px;
  background: var(--ink);
  border: 2px solid var(--mint);
  transition: background .18s ease, box-shadow .18s ease;
}

.page-about .ver:hover .ver__node,
.page-about .ver:focus-within .ver__node {
  background: var(--mint);
  box-shadow: 0 0 0 6px rgba(53, 242, 194, .18);
}

.page-about .ver__code {
  font-family: var(--font-num);
  font-size: clamp(20px, 2.4vw, 26px);
  letter-spacing: .02em;
  color: var(--mint);
}

.page-about .ver__title {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(19px, 2.2vw, 26px);
  line-height: 1.1;
  margin: 4px 0 0;
}

.page-about .ver__text {
  margin: 10px 0 0;
  max-width: 56ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--haze);
}

.page-about .ver__link {
  display: inline-block;
  margin-top: 12px;
  font-family: var(--font-num);
  font-size: 13px;
  color: var(--orange-soft);
  text-decoration: none;
  border-bottom: 1px dashed var(--line);
}

.page-about .ver__link:hover {
  color: var(--orange);
  border-color: var(--orange);
}

/* ---------- 团队与值守 ---------- */
.page-about .about-team__grid {
  display: grid;
  gap: clamp(24px, 3.5vw, 44px);
}

.page-about .about-team__media {
  border: var(--about-line);
  box-shadow: var(--shadow-block);
  background: var(--ink-deep);
}

.page-about .team-band {
  list-style: none;
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: var(--about-line);
}

.page-about .team-cell {
  background: var(--panel);
  padding: clamp(14px, 2vw, 20px);
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .team-cell__value {
  font-family: var(--font-num);
  font-size: clamp(26px, 3vw, 36px);
  line-height: 1;
  color: var(--paper);
}

.page-about .team-cell__name {
  font-size: 14px;
  color: var(--mint);
}

.page-about .team-cell__desc {
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--muted);
}

.page-about .about-team__note {
  margin: 18px 0 0;
  font-size: 14px;
  line-height: 1.7;
}

/* ---------- 合作生态 ---------- */
.page-about .about-eco__grid {
  display: grid;
  gap: clamp(24px, 3.5vw, 44px);
}

.page-about .eco {
  list-style: none;
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line);
}

.page-about .eco__item {
  display: grid;
  gap: 6px;
  padding: clamp(16px, 2.2vw, 22px) 0;
  border-bottom: 1px solid var(--line);
}

.page-about .eco__name {
  font-family: var(--font-head);
  font-size: clamp(18px, 2vw, 22px);
  line-height: 1.1;
  margin: 0;
}

.page-about .eco__desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--haze);
}

.page-about .about-eco__media {
  border: var(--about-line);
  box-shadow: var(--shadow-block);
  background: var(--ink-deep);
}

/* ---------- 规范与行业观察 ---------- */
.page-about .rules {
  list-style: none;
  margin: clamp(24px, 3vw, 34px) 0 0;
  padding: 0;
  display: grid;
  gap: clamp(12px, 1.6vw, 16px);
}

.page-about .rule {
  border-left: 3px solid var(--mint-deep);
  background: var(--panel-soft);
  padding: clamp(16px, 2vw, 22px);
  transition: border-color .18s ease, background .18s ease;
}

.page-about .rule:hover,
.page-about .rule:focus-within {
  border-color: var(--mint);
  background: var(--panel);
}

.page-about .rule__num {
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--muted);
}

.page-about .rule__title {
  font-size: clamp(16px, 1.8vw, 19px);
  font-weight: 700;
  margin: 8px 0 0;
}

.page-about .rule__text {
  margin: 8px 0 0;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--haze);
}

.page-about .honor {
  margin-top: clamp(20px, 2.6vw, 28px);
  border: var(--about-line);
  border-left: 6px solid var(--orange);
  background: linear-gradient(90deg, rgba(255, 138, 61, .16), rgba(255, 138, 61, .02));
  padding: clamp(18px, 2.4vw, 26px);
  display: flex;
  flex-wrap: wrap;
  gap: 10px 18px;
  align-items: baseline;
}

.page-about .honor__label {
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--orange-soft);
}

.page-about .honor__text {
  margin: 0;
  font-family: var(--font-head);
  font-size: clamp(19px, 2.4vw, 26px);
  line-height: 1.2;
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  padding-bottom: 0;
}

.page-about .about-cta__inner {
  border: var(--about-line);
  background: var(--panel);
  box-shadow: var(--shadow-block);
  padding: clamp(24px, 4vw, 48px);
}

.page-about .about-cta h2 {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(26px, 4vw, 44px);
  line-height: 1.05;
  margin: 0;
}

.page-about .about-cta p {
  margin: 14px 0 0;
  max-width: 56ch;
  line-height: 1.75;
  color: var(--haze);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 3vw, 28px);
}

/* ---------- 断点 ---------- */
@media (min-width: 640px) {
  .page-about .eco__item {
    grid-template-columns: minmax(0, 4fr) minmax(0, 7fr);
    gap: clamp(14px, 2vw, 32px);
    align-items: baseline;
  }

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

@media (min-width: 700px) {
  .page-about .team-band {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 780px) {
  .page-about .rules {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 820px) {
  .page-about .about-facts__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 860px) {
  .page-about .lanes {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    align-items: start;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }

  .page-about .about-vers__grid {
    grid-template-columns: minmax(0, 4fr) minmax(0, 7fr);
    align-items: start;
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: start;
  }

  .page-about .about-eco__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: start;
  }

  .page-about .about-eco__media {
    margin-top: clamp(22px, 3vw, 32px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .lane,
  .page-about .rule,
  .page-about .fact,
  .page-about .ver__node {
    transition: none;
  }

  .page-about .lane:hover,
  .page-about .lane:focus-within {
    transform: none;
  }
}