.page-about {
  --about-text: #C6D4DF;
  --about-axis: #2C4A66;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(24px, 4vw, 48px) 0 clamp(40px, 6vw, 72px);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -30%;
  left: -15%;
  width: 70%;
  height: 130%;
  background: radial-gradient(circle at 40% 40%, rgba(34, 211, 197, 0.14), transparent 62%);
  pointer-events: none;
}

.page-about .about-hero__grid {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--sp-3);
  margin-top: var(--sp-3);
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(36px, 6vw, 84px);
  line-height: 0.98;
  letter-spacing: -0.02em;
  color: var(--frost);
  margin: 0 0 var(--sp-2);
}

.page-about .about-hero__lead {
  margin: 0;
  color: var(--about-text);
  max-width: 46ch;
}

.page-about .about-hero__media {
  margin: 0;
  border: 1px solid var(--line);
  overflow: hidden;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 34px), 0 100%);
}

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

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-top: var(--sp-3);
  border-top: 1px solid var(--line);
}

.page-about .fact {
  padding: var(--sp-2) 12px 0 0;
  border-right: 1px solid var(--line-soft);
  min-width: 0;
}

.page-about .fact:last-child {
  border-right: 0;
  padding-right: 0;
}

.page-about .fact__v {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(20px, 3.2vw, 36px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--amber);
  font-variant-numeric: tabular-nums;
}

.page-about .fact:nth-child(2) .fact__v {
  color: var(--cyan);
}

.page-about .fact__k {
  display: block;
  margin-top: 8px;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--mist);
}

/* ---------- 主体双栏 ---------- */
.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--sp-3);
  padding-bottom: var(--sp-4);
}

.page-about .about-index__list {
  list-style: none;
  margin: var(--sp-1) 0 0;
  padding: 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-index__list li {
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-index__link {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 11px 0;
  font-size: 14px;
  color: var(--mist);
  text-decoration: none;
  transition: color 0.2s ease;
}

.page-about .about-index__tick {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--about-axis);
  min-width: 48px;
  flex: 0 0 auto;
  transition: color 0.2s ease;
}

.page-about .about-index__link:hover {
  color: var(--frost);
}

.page-about .about-index__link[aria-current] {
  color: var(--frost);
  font-weight: 700;
}

.page-about .about-index__link[aria-current] .about-index__tick {
  color: var(--cyan);
}

.page-about .about-index__link[aria-current]::before {
  content: "";
  position: absolute;
  left: -12px;
  top: 50%;
  width: 6px;
  height: 6px;
  margin-top: -3px;
  background: var(--cyan);
  border-radius: 50%;
}

/* ---------- 章节 ---------- */
.page-about .about-sec {
  padding: clamp(32px, 4.5vw, 60px) 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-sec:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .about-sec__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(26px, 3.6vw, 46px);
  line-height: 1.1;
  letter-spacing: -0.015em;
  color: var(--frost);
  margin: 10px 0 var(--sp-2);
}

.page-about .about-sec .prose {
  margin: 0;
  max-width: 64ch;
  color: var(--about-text);
  font-size: 16px;
  line-height: 1.8;
}

/* ---------- 时间轴 ---------- */
.page-about .tl {
  list-style: none;
  margin: var(--sp-3) 0 0;
  padding: 0;
}

.page-about .tl__item {
  display: grid;
  grid-template-columns: 62px minmax(0, 1fr);
  gap: var(--sp-2);
}

.page-about .tl__year {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--amber);
  text-align: right;
  padding-top: 4px;
  font-variant-numeric: tabular-nums;
}

.page-about .tl__body {
  position: relative;
  border-left: 1px solid var(--line);
  padding: 0 0 var(--sp-3) var(--sp-2);
}

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

.page-about .tl__body::before {
  content: "";
  position: absolute;
  left: -4px;
  top: 6px;
  width: 7px;
  height: 7px;
  background: var(--ink);
  border: 1px solid var(--cyan);
  transform: rotate(45deg);
}

.page-about .tl__item--now .tl__body::before {
  left: -5px;
  width: 9px;
  height: 9px;
  background: var(--amber);
  border-color: var(--amber);
}

.page-about .tl__name {
  margin: 0 0 6px;
  font-size: 19px;
  font-weight: 700;
  color: var(--frost);
  line-height: 1.4;
}

.page-about .tl__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--about-text);
  max-width: 62ch;
}

.page-about .tl__text a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 团队配比 ---------- */
.page-about .roster {
  list-style: none;
  margin: var(--sp-3) 0 0;
  padding: 0;
}

.page-about .roster__item {
  padding: var(--sp-2) 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .roster__item:last-child {
  border-bottom: 1px solid var(--line-soft);
}

.page-about .roster__top {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--sp-2);
}

.page-about .roster__name {
  font-size: 18px;
  font-weight: 700;
  color: var(--frost);
}

.page-about .roster__count {
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 700;
  color: var(--frost);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

.page-about .roster__count em {
  font-style: normal;
  font-size: 12px;
  font-weight: 400;
  letter-spacing: 0.1em;
  color: var(--mist);
  margin-left: 4px;
}

.page-about .roster__track {
  height: 6px;
  margin: 12px 0;
  background: rgba(44, 74, 102, 0.42);
  overflow: hidden;
}

.page-about .roster__fill {
  display: block;
  height: 100%;
  transition: filter 0.2s ease;
}

.page-about .roster__fill--a {
  width: 58%;
  background: var(--cyan);
}

.page-about .roster__fill--b {
  width: 27%;
  background: var(--amber);
}

.page-about .roster__fill--c {
  width: 15%;
  background: #6E8BA3;
}

.page-about .roster__item:hover .roster__fill {
  filter: brightness(1.25);
}

.page-about .roster__duty {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--about-text);
  max-width: 62ch;
}

/* ---------- 流程步骤 ---------- */
.page-about .steps {
  list-style: none;
  margin: var(--sp-3) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--sp-2);
}

.page-about .steps__item {
  position: relative;
  min-width: 0;
}

.page-about .steps__idx {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--cyan);
  padding-bottom: 8px;
}

.page-about .steps__name {
  margin: 0 0 6px;
  font-size: 18px;
  font-weight: 700;
  color: var(--frost);
}

.page-about .steps__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--about-text);
}

.page-about .about-stepmedia {
  margin: var(--sp-3) 0 0;
  border: 1px solid var(--line);
  overflow: hidden;
}

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

/* ---------- 比赛日值守条 ---------- */
.page-about .about-shift {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  margin-top: var(--sp-3);
}

.page-about .about-shift__cell {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: var(--sp-2) 16px;
  background: var(--panel);
  min-width: 0;
}

.page-about .about-shift__cell--mid {
  background: var(--panel-lift);
}

.page-about .about-shift__t {
  font-family: var(--font-mono);
  font-size: clamp(18px, 2.8vw, 28px);
  font-weight: 700;
  line-height: 1;
  color: var(--amber);
  font-variant-numeric: tabular-nums;
}

.page-about .about-shift__cell--mid .about-shift__t {
  color: var(--cyan);
}

.page-about .about-shift__k {
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--mist);
  line-height: 1.5;
}

.page-about .about-shift__note {
  margin: var(--sp-2) 0 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--about-text);
  max-width: 64ch;
}

/* ---------- 三条做法 ---------- */
.page-about .creed {
  list-style: none;
  margin: var(--sp-3) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--sp-3);
}

.page-about .creed__item {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: var(--sp-2);
}

.page-about .creed__n {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--amber);
  border-top: 1px solid var(--amber);
  padding-top: 6px;
  font-variant-numeric: tabular-nums;
}

.page-about .creed__name {
  margin: 0 0 8px;
  font-size: 19px;
  font-weight: 700;
  color: var(--frost);
  line-height: 1.4;
}

.page-about .creed__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--about-text);
  max-width: 60ch;
}

/* ---------- 合作与认可 ---------- */
.page-about .about-pair {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--sp-3);
  margin-top: var(--sp-2);
}

.page-about .about-pair__text .prose + .prose {
  margin-top: var(--sp-2);
}

.page-about .about-marks {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .about-marks__item {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-marks__v {
  font-family: var(--font-mono);
  font-size: clamp(22px, 3vw, 30px);
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
  flex: 0 0 auto;
  min-width: 74px;
}

.page-about .about-marks__k {
  font-size: 13px;
  line-height: 1.6;
  color: var(--mist);
}

/* ---------- 页尾推进区 ---------- */
.page-about .about-outro {
  position: relative;
  overflow: hidden;
  background: var(--ink-deep);
  border-top: 1px solid var(--line);
  padding: clamp(52px, 8vw, 112px) 0;
}

.page-about .about-outro__bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.3;
  filter: saturate(0.75);
}

.page-about .about-outro::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(100deg, rgba(7, 20, 31, 0.95) 0%, rgba(7, 20, 31, 0.76) 55%, rgba(7, 20, 31, 0.34) 100%);
  pointer-events: none;
}

.page-about .about-outro__inner {
  position: relative;
  z-index: 1;
}

.page-about .about-outro__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(30px, 5vw, 64px);
  line-height: 1.02;
  letter-spacing: -0.02em;
  color: var(--frost);
  margin: 12px 0 var(--sp-2);
  max-width: 16ch;
}

.page-about .about-outro__lead {
  margin: 0 0 var(--sp-3);
  color: var(--about-text);
  max-width: 52ch;
}

.page-about .about-outro__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 桌面端 ---------- */
@media (min-width: 900px) {
  .page-about .steps {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0;
  }

  .page-about .steps__item {
    padding: 0 clamp(14px, 2vw, 24px);
    border-left: 1px solid var(--line-soft);
  }

  .page-about .steps__item:first-child {
    padding-left: 0;
    border-left: 0;
  }

  .page-about .steps__item:last-child {
    padding-right: 0;
  }

  .page-about .steps__item + .steps__item::before {
    content: "→";
    position: absolute;
    left: -1px;
    top: -4px;
    transform: translateX(-50%);
    font-size: 12px;
    line-height: 1;
    color: var(--line);
    background: var(--ink);
    padding: 3px 1px;
  }
}

@media (min-width: 960px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: clamp(24px, 4vw, 56px);
    align-items: end;
  }

  .page-about .about-hero__media {
    clip-path: polygon(0 0, 100% 0, 100% 100%, 0 calc(100% - 52px));
  }

  .page-about .about-pair {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: clamp(32px, 5vw, 72px);
    align-items: start;
  }
}

@media (min-width: 1080px) {
  .page-about .about-body {
    grid-template-columns: 210px minmax(0, 1fr);
    gap: clamp(32px, 5vw, 80px);
    align-items: start;
  }

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

  .page-about .tl__item {
    grid-template-columns: 72px minmax(0, 1fr);
  }
}

@media (min-width: 1280px) {
  .page-about .creed {
    gap: var(--sp-4);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-index__link,
  .page-about .roster__fill {
    transition: none;
  }
}
<<<END>>>