.page-about {
  --about-rule: rgba(201, 214, 227, 0.18);
  --about-rule-cyan: rgba(49, 230, 214, 0.32);
  --about-rule-paper: rgba(28, 36, 48, 0.16);
  --about-panel: #08203A;
  background: var(--deep-space);
  color: var(--mist);
  overflow-x: hidden;
}

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

/* ---------- 首屏：4:8 分屏 ---------- */

.page-about .about-hero {
  position: relative;
  padding-top: calc(var(--header-h) + clamp(1rem, 3vw, 2rem));
  padding-bottom: clamp(2.5rem, 7vw, 5rem);
  background:
    radial-gradient(circle at 82% -12%, rgba(49, 230, 214, 0.16), transparent 52%),
    radial-gradient(circle at 4% 112%, rgba(107, 31, 58, 0.3), transparent 58%),
    var(--deep-space);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.5rem, 4vw, 2.5rem);
}

.page-about .about-hero__rail {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  min-width: 0;
}

.page-about .about-hero__rail-top {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.5rem 1rem;
}

.page-about .about-hero__stamp {
  margin: 0;
  font-size: 0.7rem;
  letter-spacing: 0.26em;
  text-transform: uppercase;
  color: var(--signal-cyan);
}

.page-about .about-hero__note {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: var(--compass-amber);
}

.page-about .about-hero__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2.4rem, 9.5vw, 4rem);
  line-height: 0.96;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .about-hero__title span {
  display: block;
}

.page-about .about-hero__body {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: clamp(1rem, 2.4vw, 1.6rem);
  padding: clamp(1.25rem, 3.6vw, 2.75rem);
  background: rgba(13, 43, 69, 0.66);
  min-width: 0;
}

.page-about .about-hero__body .crumbs {
  font-size: 0.76rem;
  letter-spacing: 0.08em;
}

.page-about .about-hero__lede {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.3rem, 2.6vw, 1.95rem);
  line-height: 1.4;
  color: var(--paper);
}

.page-about .about-hero__text {
  margin: 0;
  max-width: 62ch;
  font-size: 1rem;
  line-height: 1.9;
  color: var(--mist);
}

.page-about .about-stats {
  list-style: none;
  margin: 0;
  padding: clamp(1rem, 2.4vw, 1.4rem) 0 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem 1.25rem;
  border-top: 1px solid var(--about-rule);
}

.page-about .about-stats li {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  min-width: 0;
}

.page-about .about-stats .mono {
  font-size: clamp(1.2rem, 2.2vw, 1.55rem);
  line-height: 1.1;
  color: var(--signal-cyan);
}

.page-about .about-stats span:last-child {
  font-size: 0.76rem;
  line-height: 1.5;
  color: var(--mist);
}

.page-about .about-jump {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  padding-top: clamp(0.9rem, 2vw, 1.2rem);
  border-top: 1px solid var(--about-rule);
}

.page-about .about-jump .chapter-link {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-decoration: none;
  color: var(--mist);
  border: 1px solid var(--about-rule);
  border-radius: var(--radius-s);
  padding: 0.34rem 0.6rem;
  transition: color 0.2s var(--ease), background-color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .about-jump .chapter-link:hover,
.page-about .about-jump .chapter-link[data-active="true"] {
  color: var(--deep-space);
  background: var(--compass-amber);
  border-color: var(--compass-amber);
}

@media (min-width: 720px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 960px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
    align-items: stretch;
    gap: clamp(1.75rem, 3.2vw, 3.25rem);
  }
}

@media (min-width: 1150px) {
  .page-about .about-hero__rail {
    flex-direction: row;
    align-items: flex-start;
    gap: 1.5rem;
    padding-top: 0.5rem;
  }

  .page-about .about-hero__title {
    order: 1;
    writing-mode: vertical-rl;
    font-size: clamp(2.8rem, 3.4vw, 3.8rem);
    letter-spacing: 0.05em;
    line-height: 1.02;
    min-height: 18rem;
  }

  .page-about .about-hero__title span {
    display: inline;
  }

  .page-about .about-hero__rail-top {
    order: 2;
    flex-direction: column;
    align-items: flex-start;
    gap: 1rem;
    align-self: flex-start;
  }

  .page-about .about-hero__note {
    writing-mode: vertical-rl;
    letter-spacing: 0.36em;
  }
}

/* ---------- 通用章节标题与正文 ---------- */

.page-about .about-sec-head {
  display: flex;
  flex-direction: column;
  gap: 0.7rem;
  max-width: 66ch;
}

.page-about .about-sec-head .eyebrow {
  color: var(--signal-cyan);
}

.page-about .about-h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.6rem, 3.4vw, 2.5rem);
  line-height: 1.18;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-p {
  margin: 0;
  max-width: 64ch;
  font-size: 1rem;
  line-height: 1.9;
  color: var(--mist);
}

/* ---------- 01 起点 ---------- */

.page-about .about-origin-section {
  background: var(--deep-space);
}

.page-about .about-origin {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.75rem, 4vw, 3rem);
  align-items: start;
}

.page-about .about-origin__media {
  margin: 0;
  position: relative;
}

.page-about .about-origin__media::after {
  content: "";
  position: absolute;
  left: -0.6rem;
  top: 1.5rem;
  width: 3px;
  height: 4.5rem;
  background: var(--compass-amber);
}

.page-about .about-origin__body {
  display: flex;
  flex-direction: column;
  gap: clamp(0.9rem, 2vw, 1.35rem);
  min-width: 0;
}

@media (min-width: 900px) {
  .page-about .about-origin {
    grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
    gap: clamp(2rem, 4vw, 3.5rem);
  }
}

/* ---------- 02 三条原则 ---------- */

.page-about .section--teal .about-sec-head .eyebrow {
  color: var(--compass-amber);
}

.page-about .about-principles__list {
  list-style: none;
  margin: clamp(2rem, 4vw, 3rem) 0 0;
  padding: 0;
  max-width: 78rem;
}

.page-about .about-principle {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.5rem;
  padding-block: clamp(1.25rem, 3vw, 1.9rem);
  border-top: 1px solid rgba(244, 241, 232, 0.22);
}

.page-about .about-principle:last-child {
  border-bottom: 1px solid rgba(244, 241, 232, 0.22);
}

.page-about .about-principle__num {
  font-size: clamp(1.5rem, 3vw, 2.2rem);
  line-height: 1;
  color: var(--compass-amber);
}

.page-about .about-principle__body h3 {
  margin: 0 0 0.45rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.1rem, 1.8vw, 1.35rem);
  color: var(--paper);
}

.page-about .about-principle__body p {
  margin: 0;
  max-width: 60ch;
  font-size: 1rem;
  line-height: 1.85;
  color: rgba(244, 241, 232, 0.86);
}

.page-about .about-principle__tag {
  margin: 0;
  align-self: center;
  justify-self: start;
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  line-height: 1.6;
  color: var(--signal-cyan);
  border-left: 2px solid var(--compass-amber);
  padding-left: 0.6rem;
}

@media (min-width: 820px) {
  .page-about .about-principle {
    grid-template-columns: 4.5rem minmax(0, 1fr) 13rem;
    align-items: start;
    gap: 1.5rem 2rem;
  }
}

/* ---------- 03 赛季内容结构 ---------- */

.page-about .section--paper .about-h2 {
  color: var(--graphite);
}

.page-about .section--paper .eyebrow {
  color: var(--link-teal);
}

.page-about .section--paper .about-p {
  color: var(--ink-soft);
}

.page-about .about-structure__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.75rem, 4vw, 3rem);
  align-items: start;
}

.page-about .about-structure__intro {
  display: flex;
  flex-direction: column;
  gap: clamp(0.9rem, 2vw, 1.35rem);
  min-width: 0;
}

.page-about .about-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
  display: grid;
  gap: clamp(1.25rem, 2.6vw, 1.75rem);
}

.page-about .about-steps::before {
  content: "";
  position: absolute;
  left: 0.62rem;
  top: 0.5rem;
  bottom: 0.5rem;
  width: 1px;
  background: linear-gradient(var(--jewel-teal), var(--compass-amber));
}

.page-about .about-step {
  position: relative;
  padding-left: 2.25rem;
}

.page-about .about-step::before {
  content: "";
  position: absolute;
  left: 0.28rem;
  top: 0.5rem;
  width: 0.6rem;
  height: 0.6rem;
  border-radius: 50%;
  background: var(--paper);
  border: 2px solid var(--jewel-teal);
}

.page-about .about-step h3 {
  margin: 0 0 0.4rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--graphite);
}

.page-about .about-step p {
  margin: 0;
  font-size: 0.98rem;
  line-height: 1.85;
  color: var(--ink-soft);
}

@media (min-width: 900px) {
  .page-about .about-structure__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: clamp(2rem, 4vw, 3.5rem);
  }
}

/* ---------- 04 发展里程 ---------- */

.page-about .about-milestones {
  background: var(--midnight-panel);
}

.page-about .about-milestones__figure {
  margin: clamp(1.5rem, 4vw, 2.5rem) 0;
}

.page-about .about-milestones__figure img {
  width: 100%;
}

.page-about .about-miles {
  list-style: none;
  margin: 0;
  padding: 0;
  max-width: 74rem;
}

.page-about .about-mile details {
  border-top: 1px solid var(--about-rule);
  padding-block: 0.6rem;
}

.page-about .about-mile:last-child details {
  border-bottom: 1px solid var(--about-rule);
}

.page-about .about-mile summary {
  list-style: none;
  display: flex;
  align-items: baseline;
  gap: 0.8rem;
  padding-block: 0.45rem;
  cursor: pointer;
}

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

.page-about .about-mile summary:hover .about-mile__title {
  color: var(--signal-cyan);
}

.page-about .about-mile__year {
  flex: 0 0 auto;
  min-width: 4.5ch;
  font-size: clamp(1rem, 2vw, 1.35rem);
  color: var(--signal-cyan);
  line-height: 1.2;
}

.page-about .about-mile__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1rem, 1.8vw, 1.2rem);
  color: var(--paper);
  transition: color 0.2s var(--ease);
}

.page-about .about-mile__hint {
  margin-left: auto;
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 1.1rem;
  color: var(--compass-amber);
  transition: transform 0.25s var(--ease);
}

.page-about .about-mile details[open] .about-mile__hint {
  transform: rotate(45deg);
}

.page-about .about-mile__body p {
  margin: 0.35rem 0 0.6rem;
  padding-left: 0;
  max-width: 60ch;
  font-size: 0.98rem;
  line-height: 1.85;
  color: var(--mist);
}

@media (min-width: 760px) {
  .page-about .about-mile__body p {
    padding-left: calc(4.5ch + 0.8rem);
  }
}

/* ---------- 05 团队与协作 ---------- */

.page-about .about-team__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.75rem, 4vw, 3rem);
  align-items: center;
}

.page-about .about-team__body {
  display: flex;
  flex-direction: column;
  gap: clamp(0.9rem, 2vw, 1.35rem);
  min-width: 0;
}

.page-about .about-team__body .eyebrow {
  color: var(--signal-cyan);
}

.page-about .about-team__body .about-p {
  color: rgba(244, 241, 232, 0.86);
}

.page-about .about-partners {
  list-style: none;
  margin: 0.35rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.75rem;
}

.page-about .about-partners li {
  display: flex;
  align-items: baseline;
  gap: 0.7rem;
  padding-bottom: 0.65rem;
  border-bottom: 1px solid rgba(244, 241, 232, 0.2);
  font-size: 0.95rem;
  color: var(--paper);
}

.page-about .about-partners .mono {
  min-width: 3ch;
  font-size: 1.35rem;
  color: var(--compass-amber);
  line-height: 1;
}

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

@media (min-width: 620px) {
  .page-about .about-partners {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 1.5rem;
  }
}

@media (min-width: 900px) {
  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: clamp(2rem, 4vw, 3.5rem);
  }
}

/* ---------- 06 长期服务承诺 ---------- */

.page-about .about-promise {
  background: var(--about-panel);
}

.page-about .about-promise__list {
  list-style: none;
  margin: clamp(1.75rem, 4vw, 2.75rem) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.5rem, 3vw, 2.25rem);
}

.page-about .about-promise__item {
  border-top: 2px solid var(--signal-cyan);
  padding-top: 0.9rem;
}

.page-about .about-promise__item h3 {
  margin: 0 0 0.5rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.05rem, 1.8vw, 1.25rem);
  color: var(--paper);
}

.page-about .about-promise__item p {
  margin: 0;
  max-width: 46ch;
  font-size: 0.95rem;
  line-height: 1.85;
  color: var(--mist);
}

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

/* ---------- 收束 ---------- */

.page-about .about-next {
  background: var(--deep-space);
  border-top: 1px solid var(--about-rule-cyan);
}

.page-about .about-next__inner {
  display: flex;
  flex-direction: column;
  gap: clamp(0.9rem, 2vw, 1.35rem);
  align-items: flex-start;
}

.page-about .about-next__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 0.35rem;
}

@media (min-width: 760px) {
  .page-about .about-next__inner {
    max-width: 60rem;
  }
}
<<<END>>>