.page-about {
  --about-line: rgba(0, 229, 192, 0.22);
  --about-line-soft: rgba(0, 229, 192, 0.06);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-top: 1rem;
  padding-bottom: clamp(2.5rem, 6vw, 4.5rem);
  position: relative;
}

.page-about .about-hero__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.25rem;
}

.page-about .about-hero__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  margin: 0 0 1.1rem;
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .about-hero__eyebrow::before {
  content: "";
  width: 1.75rem;
  height: 1px;
  background: var(--cyan);
}

.page-about .about-hero__title {
  margin: 0 0 1.15rem;
  font-size: clamp(1.9rem, 6.4vw, 3.6rem);
  line-height: 1.12;
  letter-spacing: -0.02em;
  font-weight: 800;
  color: var(--white);
  max-width: 15ch;
}

.page-about .about-hero__lead {
  margin: 0 0 2rem;
  max-width: 40em;
  font-size: clamp(1rem, 1.6vw, 1.1rem);
  line-height: 1.78;
  color: var(--muted);
}

.page-about .about-hero__stats {
  list-style: none;
  margin: 0;
  padding: 1.4rem 0 0;
  border-top: 1px solid var(--ink-700);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.4rem 1rem;
}

.page-about .about-hero__stats .stat {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.page-about .about-hero__stats .stat__value {
  font-size: clamp(1.55rem, 3.4vw, 2.1rem);
  line-height: 1;
  font-weight: 700;
  color: var(--white);
}

.page-about .about-hero__stats .stat__value em {
  font-style: normal;
  font-size: 0.65em;
  margin-left: 0.06em;
  color: var(--orange);
}

.page-about .about-hero__stats .stat__label {
  font-size: 0.8125rem;
  line-height: 1.5;
  letter-spacing: 0.05em;
  color: var(--muted);
}

.page-about .about-hero__media {
  position: relative;
}

.page-about .about-hero__media::after {
  content: "";
  position: absolute;
  right: -0.6rem;
  bottom: -0.6rem;
  width: 42%;
  height: 42%;
  border-right: 2px solid var(--orange);
  border-bottom: 2px solid var(--orange);
  opacity: 0.65;
  pointer-events: none;
}

/* ---------- 品牌主张 ---------- */
.page-about .about-position__body {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

.page-about .about-position__main {
  max-width: 38em;
}

.page-about .about-position__note {
  display: flex;
  flex-direction: column;
  gap: 1.1rem;
}

.page-about .about-position__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.75rem;
}

.page-about .about-position__list li {
  position: relative;
  padding-left: 1.4rem;
  font-size: 0.9375rem;
  line-height: 1.6;
  color: var(--white);
}

.page-about .about-position__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 0.75rem;
  height: 2px;
  background: var(--cyan);
}

/* ---------- 赛事覆盖 ---------- */
.page-about .about-coverage__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.25rem;
}

.page-about .about-coverage__tags {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  gap: 0.75rem;
}

.page-about .about-coverage__tag {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  padding: 0.85rem 1.1rem;
  border: 1px solid var(--ink-700);
  border-radius: var(--radius);
  background: var(--ink-800);
  transition: border-color 160ms ease, transform 160ms ease;
}

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

.page-about .about-coverage__tag--lg {
  flex: 1 1 46%;
  border-color: var(--about-line);
}

.page-about .about-coverage__tag--md {
  flex: 1 1 40%;
}

.page-about .about-coverage__tag--sm {
  flex: 1 1 30%;
}

.page-about .about-coverage__name {
  font-size: clamp(1.05rem, 2.6vw, 1.45rem);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .about-coverage__scope {
  font-size: 0.75rem;
  line-height: 1.5;
  letter-spacing: 0.04em;
  color: var(--muted);
}

.page-about .about-coverage__tag:hover .about-coverage__scope {
  color: var(--cyan-soft);
}

.page-about .about-coverage__facts {
  margin: 0 0 1.75rem;
  display: grid;
  gap: 1.1rem;
}

.page-about .about-coverage__fact {
  display: grid;
  grid-template-columns: minmax(5.5rem, auto) 1fr;
  gap: 1rem;
  align-items: baseline;
  padding-bottom: 1.1rem;
  border-bottom: 1px solid var(--ink-700);
}

.page-about .about-coverage__fact dt {
  font-size: clamp(1.4rem, 3vw, 1.9rem);
  font-weight: 700;
  color: var(--orange);
  line-height: 1;
}

.page-about .about-coverage__fact dt em {
  font-style: normal;
  font-size: 0.65em;
}

.page-about .about-coverage__fact dd {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.65;
  color: var(--muted);
}

.page-about .about-coverage__cta-text {
  margin: 0 0 1rem;
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 版本时间轴 ---------- */
.page-about .about-timeline__list {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.page-about .about-timeline__list::before {
  content: "";
  position: absolute;
  left: 0.95rem;
  top: 0.5rem;
  bottom: 0.5rem;
  width: 2px;
  background: linear-gradient(to bottom, var(--cyan) 0%, rgba(0, 229, 192, 0.12) 100%);
}

.page-about .about-timeline__item {
  position: relative;
  padding-left: 2.75rem;
  padding-bottom: 2.5rem;
}

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

.page-about .about-timeline__marker {
  position: absolute;
  left: 0;
  top: 0;
  width: 2rem;
  height: 2rem;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--ink-900);
  border: 2px solid var(--cyan);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--cyan);
  box-shadow: 0 0 0 4px var(--ink-900);
}

.page-about .about-timeline__item--accent .about-timeline__marker {
  border-color: var(--orange);
  color: var(--orange);
}

.page-about .about-timeline__season {
  margin: 0 0 0.5rem;
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  color: var(--muted);
}

.page-about .about-timeline__title {
  margin: 0 0 0.7rem;
  font-size: clamp(1.25rem, 3vw, 1.65rem);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .about-timeline__text {
  margin: 0 0 1rem;
  max-width: 38em;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .about-timeline__detail {
  border-left: 2px solid var(--about-line);
  padding-left: 1rem;
}

.page-about .about-timeline__detail summary {
  cursor: pointer;
  font-size: 0.8125rem;
  letter-spacing: 0.08em;
  color: var(--cyan);
  list-style: none;
}

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

.page-about .about-timeline__detail summary::before {
  content: "+ ";
  color: var(--orange);
}

.page-about .about-timeline__detail[open] summary::before {
  content: "− ";
}

.page-about .about-timeline__detail p {
  margin: 0.7rem 0 0;
  font-size: 0.875rem;
  line-height: 1.7;
  color: var(--muted);
  max-width: 36em;
}

.page-about .about-timeline__compare {
  display: grid;
  gap: 0.6rem;
  margin-top: 0.35rem;
}

.page-about .about-timeline__path {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
  padding: 0.7rem 1rem;
  border-radius: var(--radius);
  border: 1px solid var(--ink-700);
  background: var(--ink-800);
  font-size: 0.8125rem;
  letter-spacing: 0.02em;
  color: var(--muted);
}

.page-about .about-timeline__path--new {
  border-color: rgba(255, 122, 26, 0.55);
  background: var(--teal);
  color: var(--white);
}

.page-about .about-timeline__path--new .mono {
  color: var(--orange);
}

.page-about .about-timeline__media {
  margin-top: 1.5rem;
  max-width: 20rem;
}

/* ---------- 团队与协作 ---------- */
.page-about .about-team__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

.page-about .about-team__subtitle {
  margin: 0 0 0.75rem;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--white);
}

.page-about .about-team__text {
  margin: 0 0 1.1rem;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--muted);
  max-width: 34em;
}

.page-about .about-team__list {
  list-style: none;
  margin: 0 0 1.1rem;
  padding: 0;
  display: grid;
  gap: 0.55rem;
}

.page-about .about-team__list li {
  position: relative;
  padding-left: 1.3rem;
  font-size: 0.875rem;
  line-height: 1.6;
  color: var(--white);
}

.page-about .about-team__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.65em;
  width: 0.7rem;
  height: 2px;
  background: var(--cyan);
}

.page-about .about-team__link {
  display: inline-block;
  font-size: 0.875rem;
  letter-spacing: 0.04em;
  color: var(--cyan);
  border-bottom: 1px solid var(--about-line);
  padding-bottom: 0.15rem;
  text-decoration: none;
}

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

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

/* ---------- 多端服务 ---------- */
.page-about .about-devices__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.1rem;
  margin-bottom: 1.5rem;
}

.page-about .about-devices__card {
  padding: 1.35rem 1.25rem;
  border: 1px solid var(--ink-700);
  border-radius: var(--radius);
  background: var(--ink-800);
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  transition: border-color 160ms ease;
}

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

.page-about .about-devices__name {
  margin: 0;
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--white);
}

.page-about .about-devices__card p {
  margin: 0;
  font-size: 0.875rem;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .about-devices__foot {
  margin: 0;
  max-width: 42em;
}

/* ---------- 合作生态 ---------- */
.page-about .about-partners__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.1rem;
}

.page-about .about-partners__item {
  padding: 1.6rem 1.35rem;
  border-top: 2px solid var(--cyan);
  background: var(--ink-800);
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.page-about .about-partners__item .stat__value {
  font-size: clamp(2rem, 5vw, 2.75rem);
  font-weight: 700;
  line-height: 1;
  color: var(--orange);
}

.page-about .about-partners__name {
  margin: 0;
  font-size: 1rem;
  font-weight: 700;
  color: var(--white);
}

.page-about .about-partners__item p {
  margin: 0;
  font-size: 0.875rem;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 服务区域与联络 ---------- */
.page-about .about-region__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

.page-about .about-region__stat {
  padding: 1.75rem 1.5rem;
  border-left: 2px solid var(--orange);
  background: linear-gradient(180deg, rgba(18, 48, 58, 0.6) 0%, rgba(11, 14, 18, 0) 100%);
}

.page-about .about-region__stat .stat__value {
  display: block;
  font-size: clamp(3rem, 9vw, 5rem);
  font-weight: 800;
  line-height: 0.95;
  letter-spacing: -0.03em;
  color: var(--orange);
  margin-bottom: 0.75rem;
}

.page-about .about-region__stat-label {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--white);
  max-width: 22em;
}

.page-about .about-region__subtitle {
  margin: 0 0 1.1rem;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--white);
}

.page-about .about-region__list {
  list-style: none;
  margin: 0 0 1.1rem;
  padding: 0;
  display: grid;
  gap: 0.85rem;
}

.page-about .about-region__list li {
  display: grid;
  grid-template-columns: minmax(5.5rem, auto) 1fr;
  gap: 0.9rem;
  align-items: baseline;
  padding-bottom: 0.85rem;
  border-bottom: 1px solid var(--ink-700);
  font-size: 0.9375rem;
  line-height: 1.65;
  color: var(--white);
  word-break: break-word;
}

.page-about .about-region__list a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--about-line);
}

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

.page-about .about-region__label {
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  color: var(--muted);
}

.page-about .about-region__note {
  margin: 0 0 1.4rem;
  font-size: 0.875rem;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .about-region__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

/* ---------- 平板 ---------- */
@media (min-width: 700px) {
  .page-about .about-coverage__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 2.5rem;
    align-items: start;
  }

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

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

  .page-about .about-team__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 2.25rem;
    align-items: start;
  }

  .page-about .about-team__media {
    grid-column: 1 / -1;
  }

  .page-about .about-region__grid {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
    gap: 2.5rem;
    align-items: start;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 980px) {
  .page-about .about-hero {
    padding-top: 1.5rem;
  }

  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: end;
    gap: clamp(2.5rem, 5vw, 4.5rem);
  }

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

  .page-about .about-position__body {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 0.85fr);
    gap: 3.5rem;
    align-items: start;
  }

  .page-about .about-coverage__grid {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 0.85fr);
  }

  .page-about .about-team__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr)) minmax(0, 1.1fr);
    gap: 2.5rem;
  }

  .page-about .about-team__media {
    grid-column: auto;
    align-self: start;
  }

  .page-about .about-region__grid {
    grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr);
    gap: 3.5rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-coverage__tag,
  .page-about .about-devices__card {
    transition: none;
  }

  .page-about .about-coverage__tag:hover {
    transform: none;
  }
}