.page-about {
  --about-rail: 176px;
  --about-gap: clamp(18px, 3vw, 36px);
  background: var(--sea-900);
  color: var(--paper);
  overflow-x: hidden;
  padding-bottom: clamp(40px, 6vw, 80px);
}

.page-about .about-hero {
  position: relative;
  isolation: isolate;
  padding: clamp(24px, 4.5vw, 56px) 0 0;
  background:
    linear-gradient(155deg, var(--sea-900) 0 44%, var(--sea-700) 44% 72%, var(--sea-800) 72% 100%);
  overflow: hidden;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -12%;
  bottom: 26%;
  width: 62%;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--orange));
  transform: rotate(-11deg);
  opacity: .55;
  z-index: 0;
  pointer-events: none;
}

.page-about .breadcrumb {
  position: relative;
  z-index: 1;
  margin: 0 0 clamp(16px, 3vw, 28px);
}

.page-about .breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--mute);
}

.page-about .breadcrumb__list li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--sea-600);
}

.page-about .breadcrumb__list a {
  color: var(--silver);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .18s, border-color .18s;
}

.page-about .breadcrumb__list a:hover,
.page-about .breadcrumb__list a:focus-visible {
  color: var(--orange);
  border-bottom-color: var(--orange);
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: var(--about-gap);
}

.page-about .index-label {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--orange);
}

.page-about .about-hero__title {
  margin: 0 0 clamp(14px, 2.4vw, 22px);
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2.3rem, 6.4vw, 4.6rem);
  line-height: .98;
  letter-spacing: -.012em;
  color: var(--paper);
}

.page-about .about-hero__lead {
  margin: 0 0 clamp(18px, 3vw, 28px);
  max-width: 46ch;
  font-size: clamp(.95rem, 1.6vw, 1.05rem);
  line-height: 1.72;
  color: var(--silver);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 11px 20px;
  border-radius: 999px;
  border: 1px solid transparent;
  font-family: var(--font-mono);
  font-size: .8rem;
  letter-spacing: .08em;
  text-decoration: none;
  transition: transform .18s, background .18s, border-color .18s, color .18s;
}

.page-about .btn--primary {
  background: var(--orange);
  color: var(--sea-900);
  font-weight: 700;
}

.page-about .btn--primary:hover,
.page-about .btn--primary:focus-visible {
  filter: brightness(1.08);
  transform: translateY(-1px);
}

.page-about .btn--ghost {
  border-color: var(--line-strong);
  color: var(--paper);
}

.page-about .btn--ghost:hover,
.page-about .btn--ghost:focus-visible {
  border-color: var(--orange);
  color: var(--orange);
}

.page-about .about-hero__facts {
  display: grid;
  gap: 1px;
  align-self: end;
  padding: 1px;
  border-radius: var(--radius);
  background: rgba(199, 210, 218, .18);
  border: 1px solid var(--line);
  overflow: hidden;
}

.page-about .about-fact {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 6px 12px;
  padding: 14px 16px;
  background: rgba(16, 46, 71, .82);
}

.page-about .about-fact__label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--mute);
}

.page-about .about-fact__value {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.1rem;
  letter-spacing: .02em;
  color: var(--paper);
}

.page-about .about-hero__band {
  position: relative;
  margin: clamp(22px, 4vw, 44px) 0 0;
  line-height: 0;
}

.page-about .about-hero__band img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: clamp(170px, 30vw, 380px);
  object-fit: cover;
  height: auto;
  aspect-ratio: 16 / 9;
  border-radius: 0;
}

.page-about .about-hero__band::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(11, 31, 51, .5), rgba(7, 19, 31, .1) 58%, var(--sea-900));
  pointer-events: none;
}

.page-about .about-body {
  display: grid;
  gap: var(--about-gap);
  margin-top: clamp(26px, 4.5vw, 56px);
}

.page-about .about-rail {
  min-width: 0;
  align-self: start;
}

.page-about .about-rail__title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--mute);
}

.page-about .about-rail__list {
  display: flex;
  gap: 6px;
  list-style: none;
  margin: 0;
  padding: 0 0 10px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-rail__item {
  flex: 0 0 auto;
}

.page-about .about-rail__link {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 12px;
  border-left: 2px solid transparent;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--mute);
  text-decoration: none;
  font-size: .84rem;
  white-space: nowrap;
  transition: color .18s, border-color .18s, background .18s;
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  color: var(--paper);
  border-left-color: var(--orange);
  background: rgba(42, 74, 99, .38);
  outline: none;
}

.page-about .about-rail__num {
  font-family: var(--font-mono);
  font-size: .9rem;
  color: var(--sea-600);
  transition: color .18s;
}

.page-about .about-rail__link:hover .about-rail__num,
.page-about .about-rail__link:focus-visible .about-rail__num {
  color: var(--orange);
}

.page-about .about-rail__text {
  letter-spacing: .02em;
}

.page-about .about-panels {
  display: grid;
  gap: clamp(16px, 2.4vw, 28px);
  min-width: 0;
}

.page-about .about-panel {
  position: relative;
  padding: clamp(20px, 3.4vw, 42px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--sea-800);
  scroll-margin-top: calc(var(--header-h) + 24px);
  animation: about-rise .5s ease-out both;
}

.page-about .about-panel:nth-child(2) { animation-delay: .07s; }
.page-about .about-panel:nth-child(4) { animation-delay: .14s; }
.page-about .about-panel:nth-child(5) { animation-delay: .2s; }

.page-about .about-panel:target {
  border-color: rgba(255, 107, 44, .6);
}

@keyframes about-rise {
  from { opacity: 0; transform: translateY(14px); }
  to { opacity: 1; transform: none; }
}

.page-about .about-panel__head {
  margin-bottom: clamp(18px, 3vw, 30px);
}

.page-about .about-panel__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.45rem, 3.2vw, 2.2rem);
  line-height: 1.1;
  letter-spacing: -.005em;
  color: var(--paper);
}

.page-about .about-panel__lead {
  margin: 0;
  max-width: 62ch;
  font-size: .95rem;
  line-height: 1.75;
  color: var(--silver);
}

/* 阶段刻度 */
.page-about .about-stages {
  position: relative;
  display: grid;
  gap: clamp(18px, 2.8vw, 28px);
  margin: 0;
  padding: 0 0 0 24px;
  list-style: none;
}

.page-about .about-stages::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  bottom: 6px;
  width: 3px;
  border-radius: 3px;
  background: linear-gradient(180deg, var(--orange), var(--sea-600) 42%, var(--line));
}

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

.page-about .about-stage::before {
  content: "";
  position: absolute;
  left: -24px;
  top: .62em;
  width: 14px;
  height: 2px;
  background: var(--orange);
}

.page-about .about-stage__num {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--mute);
}

.page-about .about-stage__title {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.12rem;
  letter-spacing: .02em;
  color: var(--paper);
}

.page-about .about-stage__text {
  margin: 0;
  max-width: 58ch;
  font-size: .92rem;
  line-height: 1.72;
  color: var(--silver);
}

/* 栏目分组 */
.page-about .filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 clamp(16px, 2.4vw, 24px);
}

.page-about .filter-btn {
  appearance: none;
  padding: 8px 14px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  background: transparent;
  color: var(--silver);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  cursor: pointer;
  transition: color .18s, border-color .18s, background .18s;
}

.page-about .filter-btn:hover,
.page-about .filter-btn:focus-visible {
  color: var(--paper);
  border-color: var(--orange);
  outline: none;
}

.page-about .filter-btn[aria-pressed="true"] {
  background: var(--orange);
  border-color: var(--orange);
  color: var(--sea-900);
  font-weight: 700;
}

.page-about .about-cols {
  display: grid;
  gap: 12px;
  grid-template-columns: minmax(0, 1fr);
}

.page-about .about-col {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 16px 16px 18px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--sea-600);
  border-radius: var(--radius-sm);
  background: linear-gradient(160deg, var(--sea-700), var(--sea-800));
  transition: border-color .18s, transform .18s;
}

.page-about .about-col:hover {
  transform: translateY(-2px);
  border-color: var(--line-strong);
}

.page-about .about-col--match { border-left-color: var(--orange); }
.page-about .about-col--team { border-left-color: var(--green); }
.page-about .about-col--replay { border-left-color: var(--amber); }
.page-about .about-col--download { border-left-color: var(--silver); }

.page-about .about-col__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: .02em;
  color: var(--paper);
}

.page-about .about-col__text {
  margin: 0;
  flex: 1 1 auto;
  font-size: .88rem;
  line-height: 1.66;
  color: var(--silver);
}

.page-about .tag {
  align-self: flex-start;
  margin-top: 4px;
}

/* 数据带 */
.page-about .about-scoreboard {
  display: grid;
  gap: 1px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: var(--line-strong);
  overflow: hidden;
  grid-template-columns: minmax(0, 1fr);
}

.page-about .about-score {
  display: grid;
  gap: 4px;
  padding: 18px 16px 20px;
  background: linear-gradient(180deg, var(--sea-700), var(--sea-900));
  color: var(--paper);
  text-decoration: none;
  transition: background .2s;
}

.page-about .about-score:hover,
.page-about .about-score:focus-visible {
  background: linear-gradient(180deg, var(--sea-600), var(--sea-800));
  outline: none;
}

.page-about .about-score__value {
  font-family: var(--font-mono);
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  font-weight: 600;
  line-height: 1;
  letter-spacing: -.02em;
}

.page-about .about-score:nth-child(1) .about-score__value { color: var(--orange); }
.page-about .about-score:nth-child(2) .about-score__value { color: var(--green); }
.page-about .about-score:nth-child(3) .about-score__value { color: var(--amber); }
.page-about .about-score:nth-child(4) .about-score__value { color: var(--paper); }

.page-about .about-score__label {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: .95rem;
  letter-spacing: .04em;
  color: var(--paper);
}

.page-about .about-score__note {
  font-size: 11.5px;
  line-height: 1.5;
  color: var(--mute);
}

/* 整理方法 */
.page-about .about-organize {
  display: grid;
  gap: clamp(16px, 3vw, 28px);
}

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

.page-about .about-organize__media img,
.page-about .about-coverage__media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line);
}

.page-about .about-organize__body {
  min-width: 0;
}

.page-about .about-points {
  display: grid;
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-point {
  padding: 12px 0 12px 14px;
  border-left: 2px solid var(--line-strong);
}

.page-about .about-point:first-child {
  border-left-color: var(--orange);
}

.page-about .about-point__title {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.02rem;
  letter-spacing: .02em;
  color: var(--paper);
}

.page-about .about-point__text {
  margin: 0;
  font-size: .9rem;
  line-height: 1.72;
  color: var(--silver);
}

.page-about .about-point__link {
  color: var(--green);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 224, 140, .45);
}

.page-about .about-point__link:hover,
.page-about .about-point__link:focus-visible {
  color: var(--paper);
  border-bottom-color: var(--paper);
}

/* 团队手风琴 */
.page-about .about-team {
  display: grid;
  gap: 8px;
}

.page-about .about-team-item {
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--sea-700);
  padding: 0 14px;
  transition: background .18s, border-color .18s;
}

.page-about .about-team-item[open] {
  background: var(--sea-600);
  border-color: var(--line-strong);
}

.page-about .about-team-item__summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 0;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: .03em;
  color: var(--paper);
}

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

.page-about .about-team-item__summary::after {
  content: "+";
  flex: none;
  font-family: var(--font-mono);
  font-size: 1.15rem;
  color: var(--orange);
}

.page-about .about-team-item[open] .about-team-item__summary::after {
  content: "–";
}

.page-about .about-team-item__body {
  margin: 0;
  padding: 0 0 16px;
  max-width: 62ch;
  font-size: .9rem;
  line-height: 1.72;
  color: var(--silver);
}

.page-about .about-team__rhythm {
  margin: clamp(16px, 2.6vw, 22px) 0 0;
  padding-top: 14px;
  border-top: 1px dashed var(--line-strong);
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.7;
  letter-spacing: .02em;
  color: var(--mute);
}

/* 服务与联系 */
.page-about .about-outro {
  margin-top: clamp(32px, 5vw, 68px);
  padding: clamp(28px, 5vw, 60px) 0 clamp(10px, 2vw, 24px);
  border-top: 1px solid var(--line);
  background: linear-gradient(180deg, var(--sea-800), var(--sea-900));
}

.page-about .about-coverage {
  display: grid;
  gap: clamp(18px, 3vw, 36px);
}

.page-about .about-coverage__body {
  min-width: 0;
}

.page-about .about-coverage__text {
  margin: 0 0 12px;
  max-width: 58ch;
  font-size: .95rem;
  line-height: 1.75;
  color: var(--silver);
}

.page-about .about-contact {
  display: grid;
  gap: 10px;
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-contact__item {
  display: grid;
  gap: 2px;
  padding-left: 12px;
  border-left: 2px solid var(--line-strong);
}

.page-about .about-contact__label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--mute);
}

.page-about .about-contact__value {
  font-size: .95rem;
  line-height: 1.55;
  color: var(--paper);
  overflow-wrap: anywhere;
}

.page-about .about-contact__note {
  margin: 14px 0 0;
  font-size: .85rem;
  line-height: 1.7;
  color: var(--mute);
}

.page-about .about-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}

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

@media (min-width: 640px) {
  .page-about .about-cols {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, .65fr);
    align-items: end;
    gap: clamp(24px, 4vw, 56px);
  }

  .page-about .about-organize {
    grid-template-columns: minmax(0, .92fr) minmax(0, 1.08fr);
    align-items: start;
  }

  .page-about .about-coverage {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr);
    align-items: start;
  }

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

@media (min-width: 1024px) {
  .page-about .about-body {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(24px, 4vw, 60px);
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--header-h) + 24px);
  }

  .page-about .about-rail__list {
    flex-direction: column;
    overflow: visible;
    gap: 2px;
    padding-bottom: 0;
  }

  .page-about .about-rail__link {
    padding: 8px 0 8px 12px;
    font-size: .9rem;
    white-space: normal;
  }

  .page-about .about-rail__num {
    font-size: clamp(1.4rem, 2.1vw, 1.9rem);
    line-height: 1;
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .about-panel {
    animation: none;
  }

  .page-about .about-col:hover,
  .page-about .btn--primary:hover {
    transform: none;
  }
}
<<<END>>>