.page-about {
  --about-rule: clamp(56px, 8vw, 112px);
  display: block;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding-block: clamp(28px, 4vw, 48px) clamp(56px, 8vw, 104px);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -34%;
  right: -14%;
  width: min(70vw, 700px);
  aspect-ratio: 1 / 1;
  border-radius: 50%;
  background: radial-gradient(circle at 34% 34%, rgba(138, 92, 255, 0.3), rgba(6, 7, 12, 0) 64%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -6vw;
  bottom: 12%;
  width: 44vw;
  height: 2px;
  background: linear-gradient(90deg, rgba(41, 242, 224, 0), var(--cyan));
  transform: rotate(-9deg);
  opacity: 0.55;
  pointer-events: none;
}

.page-about .about-hero .breadcrumb {
  position: relative;
  z-index: 1;
  margin-bottom: clamp(28px, 4vw, 52px);
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(32px, 5vw, 60px);
  align-items: end;
}

.page-about .about-hero__anno {
  display: inline-block;
  color: var(--cyan);
  margin-bottom: 18px;
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-size: clamp(44px, 8.5vw, 124px);
  font-weight: 900;
  line-height: 0.94;
  letter-spacing: -0.02em;
  color: var(--white);
  margin: 0 0 clamp(20px, 3vw, 34px);
}

.page-about .about-hero__lead {
  max-width: 58ch;
  margin: 0;
  color: var(--muted);
  font-size: var(--fs-body);
  line-height: 1.75;
}

.page-about .about-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 24px;
  margin: clamp(22px, 3vw, 34px) 0 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: var(--fs-label);
  letter-spacing: 0.14em;
  color: var(--gray);
}

.page-about .about-hero__meta li {
  display: flex;
  align-items: center;
  gap: 10px;
}

.page-about .about-hero__meta li::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--lime);
  flex: none;
}

.page-about .about-hero__panel {
  position: relative;
  padding: clamp(22px, 3vw, 30px) clamp(22px, 3vw, 30px) clamp(24px, 3vw, 32px);
  border-radius: var(--r-lg);
  border: 1px solid var(--line);
  background:
    linear-gradient(158deg, rgba(138, 92, 255, 0.18), rgba(6, 7, 12, 0) 60%),
    var(--panel);
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.page-about .about-hero__panel:hover {
  border-color: rgba(41, 242, 224, 0.5);
  transform: translateY(-3px);
}

.page-about .about-hero__panel-label {
  margin: 0;
  color: var(--gray);
}

.page-about .about-hero__panel-ver {
  font-size: clamp(52px, 7vw, 88px);
  font-weight: 700;
  line-height: 0.9;
  letter-spacing: -0.05em;
  color: var(--cyan);
  margin: 10px 0 16px;
}

.page-about .about-hero__panel-text {
  margin: 0 0 20px;
  color: var(--muted);
  font-size: var(--fs-body);
  line-height: 1.7;
  max-width: 34ch;
}

.page-about .about-hero__panel-link {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: var(--fs-label);
  letter-spacing: 0.12em;
  color: var(--orange);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 106, 43, 0.4);
  padding-bottom: 3px;
  transition: color 0.18s ease, border-color 0.18s ease;
}

.page-about .about-hero__panel-link:hover,
.page-about .about-hero__panel-link:focus-visible {
  color: var(--cyan);
  border-color: var(--cyan);
}

/* ---------- 吸顶章节目录 ---------- */
.page-about .about-rail {
  position: sticky;
  top: var(--header-h);
  z-index: 6;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: rgba(6, 7, 12, 0.9);
  backdrop-filter: blur(12px);
}

.page-about .about-rail__inner {
  display: flex;
  align-items: center;
  gap: 16px;
  min-height: 56px;
  padding-block: 8px;
}

.page-about .about-rail__label {
  flex: none;
  color: var(--gray);
}

.page-about .about-rail__list {
  display: flex;
  gap: 6px;
  margin: 0;
  padding: 0 0 2px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-rail__list::-webkit-scrollbar {
  display: none;
}

.page-about .about-rail__link {
  display: inline-block;
  white-space: nowrap;
  padding: 8px 14px;
  border-radius: var(--r-pill);
  border: 1px solid transparent;
  font-family: var(--font-mono);
  font-size: var(--fs-label);
  letter-spacing: 0.1em;
  color: var(--gray);
  text-decoration: none;
  transition: color 0.18s ease, border-color 0.18s ease, background 0.18s ease;
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  color: var(--cyan);
  border-color: var(--line);
}

.page-about .about-rail__link[aria-current="true"],
.page-about .about-rail__link.is-active {
  color: var(--ink);
  background: var(--cyan);
  border-color: var(--cyan);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-chapter {
  scroll-margin-top: calc(var(--header-h) + 80px);
  padding-block: clamp(64px, 9vw, 140px);
}

.page-about .about-chapter__head {
  margin-bottom: clamp(30px, 4.5vw, 56px);
  max-width: 900px;
}

.page-about .about-chapter__marker {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 14px;
}

.page-about .about-chapter__marker .annotation {
  color: var(--violet);
}

.page-about .about-chapter__title {
  font-family: var(--font-display);
  font-size: clamp(30px, 4.4vw, 56px);
  font-weight: 800;
  line-height: 1.04;
  letter-spacing: -0.015em;
  color: var(--white);
  margin: 0;
  max-width: 22ch;
}

.page-about .about-chapter__note {
  margin: 18px 0 0;
  max-width: 56ch;
  color: var(--gray);
  font-size: var(--fs-note);
  line-height: 1.7;
}

.page-about .about-chapter__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 44px);
  align-items: start;
}

.page-about .about-chapter__footnote {
  margin: clamp(28px, 4vw, 44px) 0 0;
  padding-top: 20px;
  border-top: 1px solid var(--line);
  max-width: 68ch;
  color: var(--gray);
  font-size: var(--fs-note);
  line-height: 1.75;
}

.page-about .about-chapter__footnote a,
.page-about .about-prose a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(41, 242, 224, 0.35);
  transition: border-color 0.18s ease, color 0.18s ease;
}

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

.page-about .about-prose {
  margin: 0 0 1.5em;
  max-width: 62ch;
  color: var(--muted);
  font-size: var(--fs-body);
  line-height: 1.75;
}

.page-about .about-prose:last-child {
  margin-bottom: 0;
}

.page-about .about-prose--tight {
  font-size: var(--fs-note);
}

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

/* ---------- 版本时间线 ---------- */
.page-about .about-timeline {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-node {
  position: relative;
  padding: 28px 24px 24px;
  border-radius: var(--r-lg);
  border: 1px solid var(--line);
  background: var(--panel);
  transition: border-color 0.2s ease, transform 0.2s ease, background 0.2s ease;
}

.page-about .about-node::before {
  content: "";
  position: absolute;
  left: 24px;
  right: 24px;
  top: 0;
  height: 2px;
  border-radius: var(--r-pill);
  background: var(--violet);
  transform: translateY(-1px);
}

.page-about .about-node--v1::before { background: var(--violet); }
.page-about .about-node--v2::before { background: var(--cyan); }
.page-about .about-node--v3::before { background: var(--violet); }
.page-about .about-node--v4::before { background: var(--orange); }

.page-about .about-node:hover,
.page-about .about-node:focus-within {
  border-color: rgba(41, 242, 224, 0.5);
  transform: translateY(-3px);
  background: #111729;
}

.page-about .about-node__ver {
  display: block;
  font-size: clamp(40px, 5.2vw, 68px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.05em;
  color: rgba(232, 236, 246, 0.16);
  margin-bottom: 14px;
  transition: color 0.2s ease;
}

.page-about .about-node--v4 .about-node__ver {
  color: rgba(255, 106, 43, 0.42);
}

.page-about .about-node:hover .about-node__ver {
  color: rgba(41, 242, 224, 0.55);
}

.page-about .about-node--v4:hover .about-node__ver {
  color: var(--orange);
}

.page-about .about-node__title {
  margin: 0 0 10px;
  font-size: var(--fs-card);
  font-weight: 700;
  color: var(--white);
  line-height: 1.3;
}

.page-about .about-node__text {
  margin: 0;
  color: var(--muted);
  font-size: var(--fs-note);
  line-height: 1.72;
}

.page-about .about-node__gain {
  margin: 14px 0 0;
  padding-top: 14px;
  border-top: 1px dashed var(--line);
  color: var(--cyan);
  font-size: var(--fs-label);
  line-height: 1.65;
  letter-spacing: 0.02em;
}

/* ---------- 编辑分工表 ---------- */
.page-about .about-roles {
  display: grid;
  gap: 1px;
  margin: 0 0 22px;
  padding: 0;
  list-style: none;
  border: 1px solid var(--line);
  border-radius: var(--r-card);
  background: var(--line);
  overflow: hidden;
}

.page-about .about-role {
  display: flex;
  align-items: baseline;
  gap: 16px;
  padding: 20px 22px;
  background: var(--panel);
  transition: background 0.18s ease;
}

.page-about .about-role:hover {
  background: #131a2c;
}

.page-about .about-role__num {
  flex: none;
  min-width: 2.4ch;
  font-size: 26px;
  font-weight: 700;
  color: var(--cyan);
  letter-spacing: -0.02em;
  line-height: 1;
}

.page-about .about-role__body {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .about-role__name {
  color: var(--white);
  font-size: var(--fs-body);
  font-weight: 600;
}

.page-about .about-role__desc {
  color: var(--gray);
  font-size: var(--fs-note);
  line-height: 1.6;
}

/* ---------- 赛区覆盖数据 ---------- */
.page-about .about-coverage {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-bottom: 26px;
  border: 1px solid var(--line);
  border-radius: var(--r-card);
  background: var(--line);
  overflow: hidden;
}

.page-about .about-coverage__stat {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 22px 20px;
  background: var(--panel);
}

.page-about .about-coverage__num {
  font-size: clamp(30px, 3.6vw, 44px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--white);
}

.page-about .about-coverage__stat:nth-child(1) .about-coverage__num { color: var(--cyan); }
.page-about .about-coverage__stat:nth-child(2) .about-coverage__num { color: var(--violet); }
.page-about .about-coverage__stat:nth-child(3) .about-coverage__num { color: var(--cyan); }
.page-about .about-coverage__stat:nth-child(4) .about-coverage__num { color: var(--orange); }

.page-about .about-coverage__label {
  color: var(--gray);
  font-size: var(--fs-label);
  letter-spacing: 0.08em;
  line-height: 1.5;
}

/* ---------- 内容准则 ---------- */
.page-about .about-principles {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: clamp(20px, 3vw, 30px);
}

.page-about .about-principle {
  position: relative;
  padding-left: 22px;
  border-left: 2px solid var(--line);
  transition: border-color 0.2s ease;
}

.page-about .about-principle:hover {
  border-left-color: var(--cyan);
}

.page-about .about-principle__title {
  margin: 0 0 10px;
  font-size: var(--fs-card);
  font-weight: 700;
  color: var(--white);
  line-height: 1.3;
}

.page-about .about-principle__text {
  margin: 0;
  color: var(--muted);
  font-size: var(--fs-note);
  line-height: 1.75;
  max-width: 56ch;
}

.page-about .about-quote {
  position: relative;
  margin: 0;
  padding: clamp(28px, 4vw, 44px);
  border-radius: var(--r-lg);
  background: var(--paper);
  border: 1px solid rgba(6, 7, 12, 0.1);
  color: var(--ink);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.page-about .about-quote:hover,
.page-about .about-quote:focus-within {
  transform: translateY(-3px);
  box-shadow: 0 20px 44px rgba(0, 0, 0, 0.42);
}

.page-about .about-quote__text {
  margin: 0 0 22px;
  font-family: var(--font-display);
  font-size: clamp(19px, 1.9vw, 24px);
  font-weight: 700;
  line-height: 1.5;
  letter-spacing: -0.005em;
  color: var(--ink);
}

.page-about .about-quote__cap {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--fs-label);
  letter-spacing: 0.14em;
  color: rgba(6, 7, 12, 0.65);
}

.page-about .about-quote__note {
  display: block;
  margin-top: 16px;
  padding-top: 14px;
  border-top: 1px solid rgba(6, 7, 12, 0.14);
  font-size: var(--fs-note);
  line-height: 1.6;
  color: rgba(6, 7, 12, 0.72);
  transition: color 0.2s ease;
}

.page-about .about-quote:hover .about-quote__note,
.page-about .about-quote:focus-within .about-quote__note {
  color: var(--ink);
}

/* ---------- 里程碑 ---------- */
.page-about .about-milestones {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  border: 1px solid var(--line);
  border-radius: var(--r-card);
  background: var(--line);
  overflow: hidden;
}

.page-about .about-milestone {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 24px 22px;
  background: var(--panel);
  transition: background 0.18s ease;
}

.page-about .about-milestone:hover {
  background: #131a2c;
}

.page-about .about-milestone__num {
  font-size: clamp(28px, 3.2vw, 40px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--cyan);
}

.page-about .about-milestone__label {
  color: var(--gray);
  font-size: var(--fs-label);
  letter-spacing: 0.08em;
  line-height: 1.55;
}

.page-about .about-milestones__note {
  margin-top: clamp(28px, 4vw, 44px);
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  padding-block: clamp(48px, 7vw, 96px);
  border-top: 1px solid var(--line);
}

.page-about .about-cta__inner {
  display: flex;
  flex-direction: column;
  gap: clamp(24px, 4vw, 40px);
  align-items: flex-start;
}

.page-about .about-cta__title {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-size: clamp(26px, 3.4vw, 44px);
  font-weight: 800;
  line-height: 1.08;
  letter-spacing: -0.015em;
  color: var(--white);
  max-width: 20ch;
}

.page-about .about-cta__lead {
  margin: 0;
  max-width: 52ch;
  color: var(--gray);
  font-size: var(--fs-body);
  line-height: 1.75;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

/* ---------- 平板与桌面 ---------- */
@media (min-width: 768px) {
  .page-about .about-chapter__grid {
    grid-template-columns: repeat(12, minmax(0, 1fr));
  }

  .page-about .about-chapter__grid > .span-7 { grid-column: span 7; }
  .page-about .about-chapter__grid > .span-6 { grid-column: span 6; }
  .page-about .about-chapter__grid > .span-5 { grid-column: span 5; }

  .page-about .about-chapter__grid--flip > .span-5 { order: -1; }

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

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

  .page-about .about-cta__inner {
    flex-direction: row;
    align-items: flex-end;
    justify-content: space-between;
  }

  .page-about .about-cta__text {
    max-width: 60ch;
  }
}

@media (min-width: 1000px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }

  .page-about .about-hero__panel {
    transform: translateY(-28px) translateX(18px);
  }

  .page-about .about-hero__panel:hover {
    transform: translateY(-31px) translateX(18px);
  }

  .page-about .about-timeline {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 24px;
    align-items: start;
  }

  .page-about .about-timeline::before {
    content: "";
    position: absolute;
    left: 2%;
    right: 2%;
    top: 34px;
    height: 1px;
    background: linear-gradient(90deg, rgba(138, 92, 255, 0.7), rgba(41, 242, 224, 0.7) 58%, rgba(255, 106, 43, 0.75));
    transform: rotate(6deg);
    transform-origin: left center;
    pointer-events: none;
  }

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

  .page-about .about-node:nth-child(1) { margin-top: 0; }
  .page-about .about-node:nth-child(2) { margin-top: 44px; }
  .page-about .about-node:nth-child(3) { margin-top: 88px; }
  .page-about .about-node:nth-child(4) { margin-top: 132px; }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .about-node,
  .page-about .about-hero__panel,
  .page-about .about-quote,
  .page-about .about-rail__link {
    transition: none;
  }
}
<<<PAGE_CSS_END>>>