.page-about {
  position: relative;
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: 22px 0 6px;
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -70px;
  right: -18%;
  width: 74%;
  height: 430px;
  background: linear-gradient(148deg, rgba(59, 232, 196, .15), rgba(255, 90, 43, .06) 58%, transparent 80%);
  transform: skewY(-8deg);
  pointer-events: none;
}

.page-about .about-hero > .container {
  position: relative;
  z-index: 1;
}

.page-about .about-hero__grid {
  display: grid;
  gap: 26px;
  align-items: start;
  margin-top: 18px;
}

.page-about .about-hero__h1 {
  margin: 12px 0 0;
  font-size: clamp(38px, 8.6vw, 82px);
  line-height: .96;
  letter-spacing: -.02em;
  font-weight: 900;
}

.page-about .about-slash {
  display: inline-block;
  padding: 0 .1em;
  color: var(--ink);
  background: var(--cyan);
  transform: skewX(-9deg);
  box-shadow: 6px 6px 0 var(--score);
}

.page-about .about-hero__lede {
  margin-top: 20px;
  max-width: 56ch;
}

.page-about .about-hero__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 20px;
}

.page-about .about-hero__card {
  position: relative;
  padding: 22px 20px 18px;
  background: var(--grad-key);
  border: 1px solid var(--line);
  clip-path: polygon(0 0, calc(100% - 24px) 0, 100% 24px, 100% 100%, 0 100%);
}

.page-about .about-hero__card-cap {
  margin: 0;
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--mist);
}

.page-about .about-hero__card-num {
  margin: 8px 0 0;
  font-size: clamp(46px, 13vw, 66px);
  line-height: 1;
  font-weight: 700;
  color: var(--cyan);
}

.page-about .about-hero__card-unit {
  margin-left: 6px;
  font-size: .32em;
  color: var(--mist);
}

.page-about .about-hero__list {
  margin: 20px 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--line);
}

.page-about .about-hero__list > div {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 7px 0;
  font-size: 14px;
}

.page-about .about-hero__list dt {
  color: var(--mist);
}

.page-about .about-hero__list dd {
  margin: 0;
  color: var(--ivory);
}

/* ---------- 章节导航 ---------- */
.page-about .about-nav {
  position: sticky;
  top: 0;
  z-index: 6;
  margin-top: 26px;
  background: rgba(4, 20, 15, .92);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .about-nav ul {
  display: flex;
  gap: 4px;
  margin: 0;
  padding: 8px 0;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .about-nav ul::-webkit-scrollbar {
  display: none;
}

.page-about .about-nav li {
  flex: 0 0 auto;
}

.page-about .about-nav a {
  display: block;
  padding: 7px 12px;
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--mist);
  border: 1px solid transparent;
  border-radius: 2px;
  white-space: nowrap;
  transition: color var(--t-fast), border-color var(--t-fast), background var(--t-fast);
}

.page-about .about-nav a:hover,
.page-about .about-nav a:focus-visible {
  color: var(--cyan);
  border-color: var(--line);
  background: var(--archive);
}

/* ---------- 章节标题 ---------- */
.page-about .about-head {
  max-width: 66ch;
}

.page-about .about-head__title {
  margin: 10px 0 0;
  letter-spacing: -.02em;
}

.page-about .about-head__lede {
  margin-top: 14px;
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline__media {
  margin: 26px 0 0;
}

.page-about .about-line {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
}

.page-about .about-line__item {
  position: relative;
  padding: 0 0 28px 26px;
  border-left: 1px solid var(--line);
  transition: border-color var(--t-fast);
}

.page-about .about-line__item::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 7px;
  width: 9px;
  height: 9px;
  background: var(--ink);
  border: 1px solid var(--cyan);
  transform: rotate(45deg);
  transition: background var(--t-fast), border-color var(--t-fast);
}

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

.page-about .about-line__item:hover {
  border-left-color: var(--cyan);
}

.page-about .about-line__item:hover::before {
  background: var(--score);
  border-color: var(--score);
}

.page-about .about-line__year {
  display: block;
  margin-bottom: 5px;
  font-size: 15px;
  letter-spacing: .1em;
  color: var(--cyan);
}

.page-about .about-line__title {
  margin: 0;
  font-size: 19px;
  font-weight: 800;
  letter-spacing: -.01em;
  color: var(--ivory);
}

.page-about .about-line__body > p {
  margin: 9px 0 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.72;
  color: var(--mist);
}

.page-about .about-line__body > .about-line__gap {
  margin-top: 12px;
  padding: 9px 13px;
  max-width: none;
  font-size: 14px;
  color: var(--cyan-soft);
  background: rgba(59, 232, 196, .07);
  border-left: 2px solid var(--cyan);
}

/* ---------- 内容与数据体系 ---------- */
.page-about .about-system__grid {
  display: grid;
  gap: 26px;
  margin-top: 28px;
}

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

.page-about .about-system__copy > p {
  margin: 0 0 14px;
  max-width: 62ch;
  color: var(--mist);
  font-size: 15.5px;
  line-height: 1.78;
}

.page-about .about-dialbox {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 18px;
  margin: 22px 0 0;
  padding: 18px;
  background: var(--grad-key);
  border: 1px solid var(--line);
  clip-path: polygon(0 0, calc(100% - 20px) 0, 100% 20px, 100% 100%, 0 100%);
}

.page-about .about-dial {
  width: 132px;
  height: 132px;
  flex: 0 0 auto;
}

.page-about .about-dial__ring {
  fill: none;
  stroke: var(--cyan);
  stroke-width: 11;
  stroke-dasharray: 3 40.46;
}

.page-about .about-dial__core {
  fill: none;
  stroke: var(--line);
  stroke-width: 1;
  stroke-dasharray: 3 7;
}

.page-about .about-dial__hub {
  fill: rgba(59, 232, 196, .08);
}

.page-about .about-dialbox__legend {
  flex: 1 1 180px;
  min-width: 0;
}

.page-about .about-dialbox__cap {
  margin: 0 0 8px;
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--mist);
}

.page-about .about-dialbox__legend ul {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-dialbox__legend li {
  padding: 4px 10px;
  font-size: 13px;
  color: var(--ivory);
  background: var(--archive);
  border: 1px solid var(--line);
  border-radius: 2px;
  transition: border-color var(--t-fast), color var(--t-fast);
}

.page-about .about-dialbox__legend li:hover {
  color: var(--cyan);
  border-color: var(--cyan);
}

.page-about .about-dialbox__note {
  margin: 10px 0 0;
  font-size: 13px;
  line-height: 1.65;
  color: var(--mist);
}

.page-about .about-nums {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-nums li {
  padding: 14px 14px 12px;
  background: var(--archive);
  border: 1px solid var(--line);
  border-bottom: 2px solid var(--cyan);
  border-radius: 2px;
  transition: transform var(--t-fast), border-color var(--t-fast);
}

.page-about .about-nums li:hover {
  transform: translateY(-2px);
  border-color: var(--cyan);
}

.page-about .about-nums__v {
  display: block;
  font-size: 26px;
  font-weight: 700;
  line-height: 1;
  color: var(--ivory);
}

.page-about .about-nums__k {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  color: var(--mist);
}

/* ---------- 团队与运营 ---------- */
.page-about .about-team__grid {
  display: grid;
  gap: 26px;
  margin-top: 28px;
  align-items: start;
}

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

.page-about .about-roles li {
  padding: 13px 15px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist);
  background: var(--archive);
  border: 1px solid var(--line);
  border-left: 2px solid var(--cyan);
  border-radius: 2px;
  transition: border-color var(--t-fast), background var(--t-fast);
}

.page-about .about-roles li:hover {
  background: var(--archive-hi);
  border-color: var(--cyan);
}

.page-about .about-roles b {
  display: block;
  margin-bottom: 4px;
  font-size: 15px;
  color: var(--ivory);
}

.page-about .about-team__note {
  margin: 18px 0 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .about-team__link {
  margin: 18px 0 0;
}

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

/* ---------- 覆盖与用户 ---------- */
.page-about .about-users {
  display: grid;
  gap: 14px;
  margin-top: 28px;
}

.page-about .about-users__item {
  display: flex;
  flex-direction: column;
  gap: 10px;
  align-items: flex-start;
}

.page-about .about-users__item .card__title {
  margin: 0;
  font-size: 18px;
  font-weight: 800;
  letter-spacing: -.01em;
}

.page-about .about-users__item p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- 长期承诺 ---------- */
.page-about .about-pledge {
  display: grid;
  gap: 14px;
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-pledge__item {
  position: relative;
  padding: 22px 20px 20px;
  background: var(--grad-key);
  border: 1px solid var(--line);
  border-top: 2px solid var(--score);
  clip-path: polygon(0 0, calc(100% - 20px) 0, 100% 20px, 100% 100%, 0 100%);
  transition: transform var(--t-fast), border-color var(--t-fast);
}

.page-about .about-pledge__item:hover {
  transform: translateY(-2px);
  border-color: var(--cyan);
}

.page-about .about-pledge__num {
  display: block;
  font-size: 13px;
  letter-spacing: .14em;
  color: var(--amber);
}

.page-about .about-pledge__title {
  margin: 10px 0 0;
  font-size: 19px;
  font-weight: 800;
  color: var(--ivory);
}

.page-about .about-pledge__item p {
  margin: 10px 0 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .about-pledge__item a {
  color: var(--cyan);
  border-bottom: 1px solid var(--line);
  transition: color var(--t-fast), border-color var(--t-fast);
}

.page-about .about-pledge__item a:hover {
  color: var(--cyan-soft);
  border-color: var(--cyan);
}

/* ---------- 合作与生态 ---------- */
.page-about .about-partner__panel {
  display: grid;
  gap: 26px;
  padding: 28px 22px;
  background: var(--grad-key);
  border: 1px solid var(--line);
  clip-path: polygon(0 0, calc(100% - 30px) 0, 100% 30px, 100% 100%, 0 100%);
}

.page-about .about-partner__lead .lede {
  margin-top: 14px;
}

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

.page-about .about-partner__list > div {
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-partner__list > div:first-child {
  padding-top: 0;
}

.page-about .about-partner__list dt {
  font-size: 15px;
  font-weight: 800;
  color: var(--cyan);
}

.page-about .about-partner__list dd {
  margin: 6px 0 0;
  max-width: 58ch;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--mist);
}

.page-about .about-partner__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 22px 0 0;
}

/* ---------- 桌面端 ---------- */
@media (min-width: 760px) {
  .page-about .about-users {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

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

@media (min-width: 900px) {
  .page-about .about-hero {
    padding-top: 34px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.4fr) minmax(260px, .6fr);
    gap: 44px;
    align-items: end;
  }

  .page-about .about-system__grid {
    grid-template-columns: minmax(0, .85fr) minmax(0, 1.15fr);
    gap: 40px;
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    gap: 40px;
    align-items: center;
  }

  .page-about .about-pledge {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
  }

  .page-about .about-partner__panel {
    grid-template-columns: minmax(0, .85fr) minmax(0, 1.15fr);
    gap: 42px;
    padding: 38px 36px;
  }

  .page-about .about-line {
    margin-top: 38px;
  }

  .page-about .about-line__item {
    padding-left: 34px;
  }

  .page-about .about-line__item::before {
    left: -6px;
    width: 11px;
    height: 11px;
  }
}

@media (min-width: 1100px) {
  .page-about .about-nav ul {
    gap: 8px;
  }
}
</main>