.page-about {
  --about-side-w: 200px;
  --about-rail-w: 56px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: 32px 0 44px;
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 24px 24px;
  opacity: 0.16;
  pointer-events: none;
  -webkit-mask-image: linear-gradient(180deg, #000 0%, transparent 92%);
  mask-image: linear-gradient(180deg, #000 0%, transparent 92%);
}

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

.page-about .about-hero__kicker {
  margin: 22px 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--cyan);
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  max-width: 22ch;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(31px, 6.6vw, 60px);
  line-height: 1.02;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .about-hero__lede {
  margin: 20px 0 0;
  max-width: 64ch;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.85;
  color: var(--stone);
}

.page-about .about-hero__facts {
  list-style: none;
  margin: 34px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-fact {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 18px 16px 20px;
  background: var(--ink);
}

.page-about .about-fact__value {
  font-family: var(--font-mono);
  font-size: 26px;
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--orange);
}

.page-about .about-fact__label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--stone);
}

/* ---------- 主骨架 ---------- */
.page-about .about-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
  padding-top: 8px;
  padding-bottom: 56px;
}

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

.page-about .about-rail {
  display: none;
}

/* ---------- 章节 ---------- */
.page-about .about-sec {
  padding: 40px 0 16px;
  scroll-margin-top: 20px;
}

.page-about .about-sec .section-head {
  margin-bottom: 26px;
}

.page-about .about-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
}

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

.page-about .about-split__side {
  padding-top: 16px;
  border-top: 1px solid var(--line);
}

.page-about .about-side__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 42px;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--cyan);
}

.page-about .about-side__num--alt {
  margin-top: 24px;
  color: var(--violet);
}

.page-about .about-side__label {
  display: block;
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--paper);
}

.page-about .about-side__note {
  margin: 10px 0 0;
  font-size: 13px;
  line-height: 1.75;
  color: var(--stone);
}

.page-about .about-side__mail {
  margin: 12px 0 0;
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--orange);
  word-break: break-all;
}

.page-about .about-split__side .copy-btn {
  margin-top: 12px;
}

/* ---------- 分隔条 ---------- */
.page-about .about-divider {
  position: relative;
  height: 44px;
  overflow: hidden;
}

.page-about .about-divider::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(115deg, var(--line) 0 1px, transparent 1px 10px);
  opacity: 0.55;
}

.page-about .about-divider::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 50%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--cyan) 20%, var(--violet) 60%, transparent 94%);
  opacity: 0.7;
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-timeline__item {
  display: grid;
  grid-template-columns: 62px minmax(0, 1fr);
  gap: 14px;
  padding: 20px 0;
  border-top: 1px solid var(--line);
}

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

.page-about .about-timeline__year {
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1.6;
  letter-spacing: 0.04em;
  color: var(--cyan);
}

.page-about .about-timeline__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18px;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-timeline__text p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--stone);
}

/* ---------- 媒体 ---------- */
.page-about .about-media {
  margin: 28px 0 0;
}

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

.page-about .about-media .media-box__cap {
  display: block;
  margin-top: 10px;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--stone);
}

/* ---------- 三条做法 ---------- */
.page-about .about-rules {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
}

.page-about .about-rules__item {
  position: relative;
  padding: 24px 20px 26px;
  background: var(--ink-2);
  border: 1px solid var(--line);
}

.page-about .about-rules__item::before {
  content: "";
  position: absolute;
  top: -1px;
  left: -1px;
  width: 44px;
  height: 3px;
  background: var(--cyan);
}

.page-about .about-rules__item:nth-child(2)::before {
  background: var(--violet);
}

.page-about .about-rules__item:nth-child(3)::before {
  background: var(--clay);
}

.page-about .about-rules__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.16em;
  color: var(--stone);
}

.page-about .about-rules__item h3 {
  margin: 12px 0 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 19px;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-rules__item p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--stone);
}

/* ---------- 数据链路 ---------- */
.page-about .about-flow {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-flow__step {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 14px;
  padding: 18px 0;
  border-top: 1px solid var(--line);
}

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

.page-about .about-flow__idx {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--ink);
  background: var(--cyan);
}

.page-about .about-flow__step h3 {
  margin: 4px 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18px;
  color: var(--paper);
}

.page-about .about-flow__step p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--stone);
}

/* ---------- 赛区 ---------- */
.page-about .about-map {
  padding: 16px;
  margin-bottom: 22px;
  background: var(--ink-2);
  border: 1px solid var(--line);
}

.page-about .about-map svg {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .about-zones {
  border-top: 1px solid var(--line);
}

.page-about .about-zones .fold__head {
  display: grid;
  grid-template-columns: 32px minmax(0, 1fr) auto 18px;
  align-items: center;
  gap: 12px;
  width: 100%;
  padding: 15px 2px;
  text-align: left;
  background: none;
  border: 0;
  border-bottom: 1px solid var(--line);
  color: var(--paper);
  cursor: pointer;
  font-family: inherit;
}

.page-about .about-zones .fold__head:hover,
.page-about .about-zones .fold__head:focus-visible {
  background: var(--cyan-soft);
  outline: none;
}

.page-about .about-zone__key {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--cyan);
}

.page-about .about-zone__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-zone__count {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--stone);
  white-space: nowrap;
}

.page-about .about-zones .fold__body {
  padding: 4px 2px 18px 46px;
  border-bottom: 1px solid var(--line);
}

.page-about .about-zones .fold__body p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--stone);
}

.page-about .about-inline-link {
  margin: 22px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--stone);
}

.page-about .about-inline-link a {
  color: var(--cyan);
}

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

.page-about .about-team__row {
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr);
  gap: 14px;
  padding: 20px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-team__num {
  font-family: var(--font-mono);
  font-size: 26px;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--cyan);
}

.page-about .about-team__body h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18px;
  color: var(--paper);
}

.page-about .about-team__body p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--stone);
}

.page-about .about-team__total {
  margin: 20px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--stone);
}

.page-about .about-team__total .mono-text {
  color: var(--orange);
}

/* ---------- 版本 ---------- */
.page-about .about-version {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
}

.page-about .about-vcard {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 12px;
  padding: 22px 20px 24px;
  background: var(--ink-2);
  border: 1px solid var(--line);
}

.page-about .about-vcard__metric {
  font-family: var(--font-mono);
  font-size: 34px;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--orange);
}

.page-about .about-vcard h3 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18px;
  line-height: 1.3;
  color: var(--paper);
}

.page-about .about-vcard p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--stone);
}

.page-about .about-version__note {
  margin: 22px 0 0;
  max-width: 72ch;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--stone);
}

.page-about .about-version__note a {
  color: var(--cyan);
}

/* ---------- 边界与纠错 ---------- */
.page-about .about-boundary {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .about-boundary li {
  position: relative;
  padding: 16px 0 16px 26px;
  border-bottom: 1px solid var(--line);
  font-size: 15px;
  line-height: 1.8;
  color: var(--stone);
}

.page-about .about-boundary li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 24px;
  width: 12px;
  height: 1px;
  background: var(--clay);
}

.page-about .about-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-fact {
    padding: 20px 18px 22px;
  }
}

@media (min-width: 780px) {
  .page-about .about-rules {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

@media (min-width: 900px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 1fr) var(--about-side-w);
    gap: 44px;
  }

  .page-about .about-split__side {
    padding-top: 0;
    padding-left: 22px;
    border-top: 0;
    border-left: 1px solid var(--line);
  }

  .page-about .about-timeline__item {
    grid-template-columns: 84px minmax(0, 1fr);
    gap: 20px;
  }

  .page-about .about-team__row {
    grid-template-columns: 82px minmax(0, 1fr);
    gap: 20px;
  }

  .page-about .about-team__num {
    font-size: 32px;
  }
}

@media (min-width: 1080px) {
  .page-about .about-shell {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: 44px;
  }

  .page-about .about-rail {
    display: block;
    position: sticky;
    top: 24px;
    align-self: start;
  }

  .page-about .about-rail__list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: 2px;
  }

  .page-about .about-rail__link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    font-family: var(--font-mono);
    font-size: 12px;
    letter-spacing: 0.06em;
    color: var(--stone);
    text-decoration: none;
    border-left: 1px solid var(--line);
    transition: color 0.18s var(--ease), background 0.18s var(--ease), border-color 0.18s var(--ease);
  }

  .page-about .about-rail__link:hover,
  .page-about .about-rail__link:focus-visible {
    color: var(--ink);
    background: var(--cyan);
    border-color: var(--cyan);
    outline: none;
  }
}
<<<END>>>