.page-about {
  --about-num: clamp(54px, 10vw, 132px);
  --about-ms-pad: clamp(22px, 3.5vw, 38px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  min-height: 40vh;
  display: flex;
  align-items: flex-end;
  padding: clamp(44px, 11vh, 120px) 0 clamp(30px, 5vh, 64px);
  background:
    radial-gradient(90% 130% at 84% 0%, rgba(124, 92, 255, 0.22), rgba(4, 6, 14, 0) 62%),
    radial-gradient(70% 100% at 6% 100%, rgba(47, 227, 212, 0.10), rgba(4, 6, 14, 0) 62%);
}

.page-about .about-h1 {
  margin: 16px 0 0;
  max-width: 22ch;
  font-size: clamp(32px, 6.4vw, 86px);
  font-weight: 200;
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--ink-100);
}

.page-about .lede {
  color: var(--ink-400);
  font-size: clamp(16px, 1.3vw, 18px);
  line-height: 1.85;
  max-width: 56ch;
}

.page-about .about-lede {
  margin-top: clamp(16px, 3vw, 28px);
}

/* ---------- 通栏视觉 ---------- */
.page-about .about-visual {
  padding: clamp(20px, 4vw, 48px) 0 clamp(40px, 7vw, 88px);
}

.page-about .about-visual img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.page-about .figure-note {
  margin: 14px 0 0;
  font-size: 12.5px;
  line-height: 1.8;
  letter-spacing: 0.02em;
  color: var(--ink-400);
  max-width: 52ch;
}

/* ---------- 章节骨架 ---------- */
.page-about .about-chapter {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(14px, 2.5vw, 26px);
  padding: clamp(52px, 9vw, 118px) 0;
}

.page-about .chapter-index {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--about-num);
  font-weight: 200;
  line-height: 0.86;
  letter-spacing: -0.05em;
  color: var(--nebula-500);
  font-variant-numeric: tabular-nums;
}

.page-about .chapter-body {
  min-width: 0;
}

.page-about .section-title {
  margin: 10px 0 0;
  font-size: clamp(25px, 3.5vw, 44px);
  font-weight: 300;
  line-height: 1.22;
  letter-spacing: -0.01em;
  color: var(--ink-100);
  max-width: 20ch;
}

.page-about .chapter-body .lede {
  margin-top: clamp(14px, 2vw, 22px);
}

.page-about .chapter-body p {
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink-100);
  max-width: 62ch;
}

/* ---------- 三条数据线 ---------- */
.page-about .line-list {
  list-style: none;
  margin: clamp(26px, 4vw, 46px) 0 0;
  padding: 0;
}

.page-about .line-item {
  padding: clamp(22px, 3vw, 34px) 0;
  border-top: 1px solid var(--line-600);
}

.page-about .line-item:last-child {
  border-bottom: 1px solid var(--line-600);
}

.page-about .line-title {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 0 0 10px;
  font-size: clamp(18px, 1.8vw, 21px);
  font-weight: 500;
  letter-spacing: 0.01em;
  color: var(--ink-100);
}

.page-about .line-title::before {
  content: "";
  flex: none;
  width: 22px;
  height: 1px;
  background: var(--cyan-400);
}

.page-about .line-text {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.9;
  color: var(--ink-400);
  max-width: 66ch;
}

.page-about .margin-note {
  margin-top: clamp(24px, 4vw, 40px);
  padding-left: 16px;
  border-left: 1px solid var(--line-600);
  max-width: 44ch;
}

.page-about .margin-note p {
  margin: 0;
  font-size: 13px;
  line-height: 1.9;
  color: var(--ink-400);
}

/* ---------- 团队分工标签页 ---------- */
.page-about .about-tabs {
  margin-top: clamp(26px, 4vw, 42px);
}

.page-about .ui-tablist {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 22px;
  border-bottom: 1px solid var(--line-600);
}

.page-about .ui-tab {
  appearance: none;
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  padding: 12px 2px;
  font-family: inherit;
  font-size: 15px;
  letter-spacing: 0.02em;
  color: var(--ink-400);
  cursor: pointer;
  transition: color 200ms var(--ease), border-color 200ms var(--ease);
}

.page-about .ui-tab:hover {
  color: var(--ink-100);
}

.page-about .ui-tab[aria-selected="true"] {
  color: var(--cyan-400);
  border-bottom-color: var(--cyan-400);
}

.page-about .ui-tab:focus-visible {
  outline: 2px solid var(--cyan-400);
  outline-offset: 3px;
}

.page-about .ui-panel {
  padding: clamp(22px, 3vw, 34px) 0 0;
}

.page-about .ui-panel[hidden] {
  display: none;
}

.page-about .ui-panel p {
  margin: 0 0 16px;
}

.page-about .plain-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .plain-list li {
  position: relative;
  padding-left: 20px;
  font-size: 15px;
  line-height: 1.9;
  color: var(--ink-400);
}

.page-about .plain-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.88em;
  width: 8px;
  height: 1px;
  background: var(--nebula-300);
}

/* ---------- 赛季节奏 ---------- */
.page-about .season-track {
  list-style: none;
  margin: clamp(26px, 4vw, 46px) 0 0;
  padding: 0;
}

.page-about .season-track > li {
  position: relative;
  padding-left: clamp(24px, 4vw, 42px);
  padding-bottom: clamp(28px, 4vw, 46px);
}

.page-about .season-track > li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  bottom: 0;
  width: 1px;
  background: var(--line-600);
}

.page-about .season-track > li::after {
  content: "";
  position: absolute;
  left: -3px;
  top: 9px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--cyan-400);
}

.page-about .season-track > li:last-child {
  padding-bottom: 0;
}

.page-about .season-track > li:last-child::before {
  bottom: auto;
  height: 14px;
}

.page-about .season-phase {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--nebula-300);
}

.page-about .season-title {
  margin: 8px 0 8px;
  font-size: clamp(17px, 1.7vw, 20px);
  font-weight: 500;
  line-height: 1.5;
  color: var(--ink-100);
}

.page-about .season-track p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.9;
  color: var(--ink-400);
  max-width: 62ch;
}

/* ---------- 档案共建 ---------- */
.page-about .split-body {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 48px);
  margin-top: clamp(18px, 3vw, 30px);
}

.page-about .split-text p {
  margin: 0 0 16px;
  font-size: 15.5px;
  line-height: 1.9;
  color: var(--ink-400);
  max-width: 56ch;
}

.page-about .split-text p:last-child {
  margin-bottom: 0;
}

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

.page-about .about-archive-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

/* ---------- 里程碑 ---------- */
.page-about .milestone-wrap {
  position: relative;
  margin-top: clamp(26px, 4vw, 46px);
}

.page-about .milestone-backdrop {
  display: none;
  position: absolute;
  inset: -6% -8%;
  overflow: hidden;
  pointer-events: none;
  z-index: 0;
}

.page-about .milestone-backdrop img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.13;
  filter: saturate(0.45);
}

.page-about .about-milestones {
  position: relative;
  z-index: 1;
  padding-left: var(--about-ms-pad);
}

.page-about .about-milestones::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 20px;
  bottom: 20px;
  width: 1px;
  background: var(--line-600);
}

.page-about .about-milestones .accordion-item {
  position: relative;
  border-top: 1px solid var(--line-600);
}

.page-about .about-milestones .accordion-item:last-child {
  border-bottom: 1px solid var(--line-600);
}

.page-about .about-milestones .accordion-item::before {
  content: "";
  position: absolute;
  left: calc(1px - var(--about-ms-pad));
  top: 24px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--cyan-400);
}

.page-about .accordion-trigger {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 16px;
  width: 100%;
  margin: 0;
  padding: 20px 0 18px;
  background: none;
  border: none;
  font-family: inherit;
  text-align: left;
  color: var(--ink-100);
  cursor: pointer;
}

.page-about .accordion-trigger:focus-visible {
  outline: 2px solid var(--cyan-400);
  outline-offset: 2px;
}

.page-about .milestone-stage {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--nebula-300);
}

.page-about .milestone-name {
  font-size: clamp(16px, 1.7vw, 20px);
  font-weight: 400;
  line-height: 1.55;
}

.page-about .accordion-trigger::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 17px;
  line-height: 1;
  color: var(--ink-400);
  transition: color 200ms var(--ease);
}

.page-about .accordion-trigger[aria-expanded="true"]::after {
  content: "−";
  color: var(--cyan-400);
}

.page-about .accordion-panel {
  padding: 0 0 22px;
}

.page-about .accordion-panel[hidden] {
  display: none;
}

.page-about .accordion-panel p {
  margin: 0;
  font-size: 15px;
  line-height: 1.9;
  color: var(--ink-400);
  max-width: 62ch;
}

/* ---------- 结尾引导 ---------- */
.page-about .about-cta {
  padding: clamp(56px, 9vw, 110px) 0 clamp(60px, 9vw, 120px);
  background:
    linear-gradient(180deg, rgba(10, 15, 36, 0) 0%, rgba(20, 27, 60, 0.85) 100%),
    var(--deepspace-950);
}

.page-about .about-cta-inner {
  border-top: 1px solid var(--nebula-500);
  padding-top: clamp(24px, 4vw, 42px);
  max-width: 68ch;
}

.page-about .about-cta-title {
  margin: 12px 0 0;
  font-size: clamp(24px, 3.2vw, 40px);
  font-weight: 300;
  line-height: 1.25;
  letter-spacing: -0.01em;
  color: var(--ink-100);
}

.page-about .about-cta-text {
  margin: clamp(14px, 2vw, 20px) 0 0;
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink-400);
}

.page-about .about-cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3vw, 34px);
}

/* ---------- 响应式 ---------- */
@media (min-width: 900px) {
  .page-about .about-chapter {
    grid-template-columns: minmax(90px, 140px) minmax(0, 1fr);
    gap: clamp(36px, 5vw, 72px);
    align-items: start;
  }

  .page-about .split-body {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.88fr);
    align-items: start;
  }

  .page-about .milestone-backdrop {
    display: block;
  }
}

@media (max-width: 719px) {
  .page-about .chapter-index {
    font-size: clamp(46px, 16vw, 72px);
  }

  .page-about .ui-tablist {
    gap: 2px 14px;
  }

  .page-about .ui-tab {
    font-size: 14px;
    padding: 10px 2px;
  }

  .page-about .line-title::before {
    width: 14px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ui-tab,
  .page-about .accordion-trigger::after {
    transition: none;
  }
}
<<<END>>>