.page-about {
  --about-panel: rgba(17, 43, 74, .66);
  --about-panel-strong: rgba(17, 43, 74, .9);
  --about-shadow: 0 20px 44px -30px rgba(5, 11, 20, .95);
  display: block;
}

/* ============ 首屏 ============ */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(1.5rem, 5vw, 3.5rem) 0 clamp(2rem, 5vw, 3.5rem);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -22%;
  right: -26%;
  width: min(50rem, 125vw);
  aspect-ratio: 1 / 1;
  background:
    radial-gradient(circle at 62% 38%, rgba(57, 255, 136, .14), transparent 60%),
    radial-gradient(circle at 26% 74%, rgba(30, 90, 58, .5), transparent 62%),
    radial-gradient(circle at 82% 82%, rgba(127, 209, 255, .1), transparent 58%);
  pointer-events: none;
  z-index: 0;
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(1.75rem, 5vw, 3.25rem);
}

@media (min-width: 1024px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.18fr) minmax(0, .8fr);
    align-items: start;
  }
}

.page-about .about-hero h1 {
  margin: .55rem 0 0;
  font-family: var(--font-display);
  font-size: clamp(2rem, 4.6vw, 3.25rem);
  font-weight: 700;
  line-height: 1.14;
  letter-spacing: -.01em;
  color: var(--c-white);
  max-width: 22ch;
}

.page-about .about-hero .lede {
  margin-top: clamp(1rem, 2.5vw, 1.4rem);
  max-width: 40rem;
}

.page-about .about-hero__points {
  list-style: none;
  margin: clamp(1.2rem, 3vw, 1.6rem) 0 0;
  padding: 0;
  display: grid;
  gap: .6rem;
}

.page-about .about-hero__points li {
  position: relative;
  padding-left: 1.35rem;
  color: var(--c-mist);
  font-size: .95rem;
  line-height: 1.65;
}

.page-about .about-hero__points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .62em;
  width: .55rem;
  height: .55rem;
  background: var(--c-signal);
  transform: rotate(45deg);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
  margin-top: clamp(1.4rem, 3vw, 1.9rem);
}

.page-about .about-hero__stats {
  list-style: none;
  margin: clamp(1.6rem, 4vw, 2.2rem) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

@media (min-width: 640px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .about-hero__stats .stat {
  background: var(--about-panel-strong);
  padding: clamp(.9rem, 2.2vw, 1.15rem) clamp(.9rem, 2.4vw, 1.25rem);
  display: grid;
  gap: .35rem;
}

.page-about .about-hero__stats .stat__num {
  font-family: var(--font-data);
  font-size: clamp(1.5rem, 3.4vw, 2.05rem);
  font-weight: 800;
  line-height: 1;
  color: var(--c-white);
  letter-spacing: -.01em;
}

.page-about .about-hero__stats .stat__num--signal {
  color: var(--c-signal);
}

.page-about .about-hero__stats .stat__num--flare {
  color: var(--c-flare);
}

.page-about .about-hero__stats .stat__unit {
  font-size: .52em;
  margin-left: .12em;
  color: var(--c-ice);
  font-weight: 700;
}

.page-about .about-hero__stats .stat__label {
  font-size: .8125rem;
  line-height: 1.5;
  color: var(--c-mist);
}

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

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

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

.page-about .about-hero__figure img {
  aspect-ratio: 4 / 3;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 2.25rem), calc(100% - 2.25rem) 100%, 0 100%);
}

.page-about .about-hero__figure::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 0;
  width: 5.5rem;
  height: 5.5rem;
  background: linear-gradient(135deg, rgba(57, 255, 136, .5), rgba(255, 138, 61, .35));
  clip-path: polygon(100% 0, 100% 100%, 0 100%);
  pointer-events: none;
}

@media (min-width: 1024px) {
  .page-about .about-hero__figure {
    margin-top: clamp(1rem, 3vw, 2rem);
  }
}

/* ============ 章节通用补充 ============ */
.page-about .section-title {
  margin: .45rem 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.2;
  color: var(--c-white);
}

.page-about .section .lede {
  margin-top: clamp(.85rem, 2vw, 1.15rem);
  max-width: 46rem;
}

/* ============ 时间轴 ============ */
.page-about .about-track {
  position: relative;
}

.page-about .timeline {
  list-style: none;
  position: relative;
  margin: clamp(2rem, 4vw, 3rem) 0 0;
  padding: 0;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: .475rem;
  top: .8rem;
  bottom: 1.6rem;
  width: 1px;
  background: linear-gradient(180deg, rgba(57, 255, 136, .7), rgba(255, 138, 61, .45) 55%, rgba(61, 90, 128, 0));
}

.page-about .timeline__item {
  position: relative;
  padding: 0 0 clamp(1.2rem, 3vw, 1.85rem) 2.1rem;
}

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

.page-about .timeline__node {
  position: absolute;
  left: 0;
  top: .55rem;
  width: .95rem;
  height: .95rem;
  background: var(--c-deep);
  border: 1px solid var(--c-signal);
  transform: rotate(45deg);
  box-shadow: 0 0 0 4px rgba(57, 255, 136, .1);
  transition: background .3s var(--ease), box-shadow .3s var(--ease);
}

@media (hover: hover) {
  .page-about .timeline__item:hover .timeline__node,
  .page-about .timeline__item:focus-within .timeline__node {
    background: var(--c-signal);
    box-shadow: 0 0 0 7px rgba(57, 255, 136, .16);
  }
}

.page-about .timeline__card {
  position: relative;
  padding: clamp(1.05rem, 2.6vw, 1.5rem);
  background: var(--about-panel);
  border: 1px solid var(--line-soft);
  clip-path: polygon(0 0, calc(100% - var(--cut)) 0, 100% var(--cut), 100% 100%, var(--cut) 100%, 0 calc(100% - var(--cut)));
  transition: background .35s var(--ease), transform .35s var(--ease);
}

.page-about .timeline__card:focus {
  outline: none;
}

@media (hover: hover) {
  .page-about .timeline__card:hover {
    background: var(--about-panel-strong);
    transform: translateY(-2px);
  }
}

.page-about .timeline__item:focus-within .timeline__card {
  background: var(--about-panel-strong);
}

.page-about .timeline__stage {
  margin: 0;
  font-family: var(--font-data);
  font-size: .78rem;
  font-weight: 700;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--c-ice);
}

.page-about .timeline__title {
  margin: .45rem 0 0;
  font-family: var(--font-display);
  font-size: clamp(1.12rem, 2.3vw, 1.4rem);
  font-weight: 700;
  line-height: 1.38;
  color: var(--c-white);
}

.page-about .timeline__summary {
  margin: .5rem 0 0;
  font-size: .95rem;
  line-height: 1.7;
  color: var(--c-mist);
}

.page-about .timeline__detail {
  display: grid;
  grid-template-rows: 1fr;
  opacity: 1;
  transition: grid-template-rows .4s var(--ease), opacity .3s var(--ease);
}

.page-about .timeline__detail-inner {
  overflow: hidden;
}

.page-about .timeline__detail-inner p {
  margin: .9rem 0 0;
  padding-top: .8rem;
  border-top: 1px solid var(--line-soft);
  font-size: .9rem;
  line-height: 1.72;
  color: var(--c-mist);
}

@media (min-width: 900px) {
  .page-about .timeline__detail {
    grid-template-rows: 0fr;
    opacity: 0;
  }

  .page-about .timeline__card:hover .timeline__detail,
  .page-about .timeline__card:focus .timeline__detail,
  .page-about .timeline__card:focus-within .timeline__detail {
    grid-template-rows: 1fr;
    opacity: 1;
  }
}

/* ============ 比对体系 ============ */
.page-about .about-method__grid {
  align-items: start;
}

.page-about .about-method__aside {
  margin-top: clamp(1.75rem, 4vw, 2.5rem);
}

@media (min-width: 768px) {
  .page-about .about-method__aside {
    margin-top: clamp(3rem, 6vw, 4.5rem);
  }
}

.page-about .about-method__figure .figure__media {
  overflow: hidden;
}

.page-about .about-method__figure img {
  aspect-ratio: 4 / 3;
  clip-path: polygon(0 0, 100% 0, 100% 100%, 1.75rem 100%, 0 calc(100% - 1.75rem));
}

.page-about .about-method__figure .figure__caption {
  margin-top: .8rem;
  padding-left: 1rem;
  border-left: 2px solid var(--c-steel);
  font-size: .8125rem;
  line-height: 1.65;
  color: var(--c-mist);
}

.page-about .flow {
  list-style: none;
  margin: clamp(1.75rem, 4vw, 2.4rem) 0 0;
  padding: 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .flow__step {
  position: relative;
  display: grid;
  gap: .4rem;
  padding: clamp(1.05rem, 2.6vw, 1.45rem) 0;
  border-bottom: 1px solid var(--line-soft);
}

@media (min-width: 640px) {
  .page-about .flow__step {
    grid-template-columns: 4.5rem minmax(0, 1fr);
    column-gap: clamp(1rem, 3vw, 1.75rem);
    align-items: start;
  }
}

.page-about .flow__num {
  font-family: var(--font-data);
  font-size: clamp(1.35rem, 3.4vw, 1.85rem);
  font-weight: 800;
  line-height: 1;
  color: var(--c-signal);
}

.page-about .flow__step:nth-child(3) .flow__num {
  color: var(--c-flare);
}

.page-about .flow__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.08rem;
  font-weight: 700;
  line-height: 1.4;
  color: var(--c-white);
}

.page-about .flow__text {
  margin: .4rem 0 0;
  font-size: .925rem;
  line-height: 1.72;
  color: var(--c-mist);
}

/* ============ 覆盖范围 ============ */
.page-about .coverage__grid {
  list-style: none;
  margin: clamp(1.75rem, 4vw, 2.4rem) 0 0;
  padding: 0;
  display: grid;
  gap: clamp(.75rem, 2vw, 1rem);
}

@media (min-width: 700px) {
  .page-about .coverage__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1180px) {
  .page-about .coverage__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .coverage__item {
  padding: clamp(1rem, 2.4vw, 1.35rem);
  background: linear-gradient(150deg, rgba(17, 43, 74, .92), rgba(10, 26, 47, .62));
  border-left: 2px solid var(--c-signal);
  clip-path: polygon(0 0, calc(100% - 14px) 0, 100% 14px, 100% 100%, 0 100%);
  transition: transform .35s var(--ease), background .35s var(--ease);
}

@media (hover: hover) {
  .page-about .coverage__item:hover {
    transform: translateY(-3px);
    background: linear-gradient(150deg, rgba(30, 90, 58, .62), rgba(10, 26, 47, .8));
  }
}

.page-about .coverage__item--b {
  border-left-color: var(--c-ice);
}

.page-about .coverage__item--c {
  border-left-color: var(--c-flare);
}

.page-about .coverage__name {
  margin: 0;
  font-family: var(--font-data);
  font-size: .95rem;
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--c-white);
}

.page-about .coverage__text {
  margin: .55rem 0 0;
  font-size: .89rem;
  line-height: 1.7;
  color: var(--c-mist);
}

.page-about .coverage__facts {
  margin-top: clamp(1.5rem, 4vw, 2.1rem);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

@media (min-width: 900px) {
  .page-about .coverage__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .coverage__fact {
  background: var(--c-deep);
  padding: clamp(.9rem, 2.4vw, 1.2rem);
}

.page-about .coverage__fact strong {
  display: block;
  font-family: var(--font-data);
  font-size: clamp(1.2rem, 2.9vw, 1.6rem);
  font-weight: 800;
  line-height: 1.15;
  color: var(--c-signal);
}

.page-about .coverage__fact span {
  display: block;
  margin-top: .35rem;
  font-size: .8rem;
  line-height: 1.55;
  color: var(--c-mist);
}

/* ============ 替补贡献场景 ============ */
.page-about .about-case__panel {
  position: relative;
  margin-top: clamp(1.5rem, 4vw, 2.25rem);
  padding: clamp(1.25rem, 3.4vw, 2.25rem);
  background: linear-gradient(135deg, rgba(30, 90, 58, .55), rgba(10, 26, 47, .88) 62%);
  border: 1px solid var(--line);
  clip-path: polygon(0 0, calc(100% - 22px) 0, 100% 22px, 100% 100%, 22px 100%, 0 calc(100% - 22px));
}

.page-about .about-case__grid {
  align-items: center;
}

.page-about .about-case__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.12rem, 2.6vw, 1.45rem);
  font-weight: 700;
  line-height: 1.45;
  color: var(--c-white);
}

.page-about .about-case__text {
  margin: .85rem 0 0;
  font-size: .94rem;
  line-height: 1.75;
  color: var(--c-mist);
}

.page-about .about-case__tags {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  margin: 1.25rem 0 0;
  padding: 0;
}

.page-about .about-case__media {
  margin-top: clamp(1.25rem, 3vw, 1.75rem);
}

.page-about .about-case__figure .figure__media {
  overflow: hidden;
}

.page-about .about-case__figure img {
  aspect-ratio: 4 / 3;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 1.5rem), calc(100% - 1.5rem) 100%, 0 100%);
}

/* ============ 团队与协作 ============ */
.page-about .team__grid {
  display: grid;
  gap: clamp(.75rem, 2vw, 1rem);
  margin-top: clamp(1.75rem, 4vw, 2.4rem);
}

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

.page-about .team__card {
  padding: clamp(1rem, 2.6vw, 1.4rem);
  background: var(--about-panel);
  border-top: 2px solid var(--c-signal);
  box-shadow: var(--about-shadow);
}

.page-about .team__card--ice {
  border-top-color: var(--c-ice);
}

.page-about .team__card--flare {
  border-top-color: var(--c-flare);
}

.page-about .team__city {
  margin: 0;
  font-family: var(--font-data);
  font-size: 1.05rem;
  font-weight: 800;
  letter-spacing: .08em;
  color: var(--c-white);
}

.page-about .team__role {
  margin: .6rem 0 0;
  font-size: .89rem;
  line-height: 1.72;
  color: var(--c-mist);
}

.page-about .team__stats {
  margin-top: clamp(1.25rem, 3vw, 1.75rem);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

@media (min-width: 860px) {
  .page-about .team__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .team__stat {
  background: var(--about-panel-strong);
  padding: clamp(.9rem, 2.4vw, 1.2rem);
}

.page-about .team__stat strong {
  display: block;
  font-family: var(--font-data);
  font-size: clamp(1.25rem, 3vw, 1.65rem);
  font-weight: 800;
  line-height: 1.1;
  color: var(--c-white);
}

.page-about .team__stat strong span {
  font-size: .55em;
  margin-left: .12em;
  color: var(--c-flare);
}

.page-about .team__stat > span {
  display: block;
  margin-top: .35rem;
  font-size: .8rem;
  line-height: 1.55;
  color: var(--c-mist);
}

.page-about .about-team__audience {
  margin-top: clamp(1.75rem, 4vw, 2.4rem);
  padding-top: clamp(1.25rem, 3vw, 1.75rem);
  border-top: 1px solid var(--line-soft);
}

.page-about .about-team__audience-title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.05rem, 2.3vw, 1.28rem);
  font-weight: 700;
  color: var(--c-white);
}

.page-about .about-team__audience-list {
  list-style: none;
  margin: clamp(1rem, 2.5vw, 1.35rem) 0 0;
  padding: 0;
  display: grid;
  gap: .85rem;
}

@media (min-width: 760px) {
  .page-about .about-team__audience-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: clamp(1.5rem, 4vw, 2.5rem);
  }
}

.page-about .about-team__audience-list li {
  position: relative;
  padding-left: 1.15rem;
  font-size: .92rem;
  line-height: 1.72;
  color: var(--c-mist);
}

.page-about .about-team__audience-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .68em;
  width: .9rem;
  height: 1px;
  background: var(--c-steel);
}

.page-about .about-team__audience-list strong {
  color: var(--c-white);
  font-weight: 700;
}

/* ============ 收束 ============ */
.page-about .about-closing {
  padding-bottom: clamp(3.5rem, 10vw, 7rem);
}

.page-about .about-closing__inner {
  padding-top: clamp(2.5rem, 7vw, 4.5rem);
  border-top: 1px solid var(--line-soft);
}

.page-about .about-closing__title {
  font-size: clamp(1.5rem, 3.6vw, 2.3rem);
  max-width: 24ch;
}

.page-about .about-closing__quote {
  margin: clamp(1.1rem, 3vw, 1.6rem) 0 0;
  font-size: 1.02rem;
  line-height: 1.85;
  color: var(--c-mist);
}

.page-about .about-closing__cta {
  margin: clamp(1.5rem, 4vw, 2.25rem) 0 0;
  font-size: .95rem;
  line-height: 1.7;
  color: var(--c-mist);
}

.page-about .about-closing__link {
  color: var(--c-signal);
  text-decoration: none;
  border-bottom: 1px solid rgba(57, 255, 136, .45);
  padding-bottom: .1rem;
  transition: border-color .25s var(--ease), color .25s var(--ease);
}

.page-about .about-closing__link:hover,
.page-about .about-closing__link:focus-visible {
  color: var(--c-white);
  border-bottom-color: var(--c-white);
}

@media (prefers-reduced-motion: reduce) {
  .page-about .timeline__card,
  .page-about .coverage__item,
  .page-about .timeline__node,
  .page-about .timeline__detail,
  .page-about .about-closing__link {
    transition: none;
  }

  .page-about .coverage__item:hover,
  .page-about .timeline__card:hover {
    transform: none;
  }
}