.page-about {
  --about-rail-w: 232px;
  background: var(--ink);
  color: var(--text);
}

.page-about .breadcrumb {
  padding-top: 18px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(760px 300px at 86% -14%, rgba(41, 224, 194, 0.16), transparent 68%),
    radial-gradient(520px 240px at 2% 112%, rgba(235, 168, 60, 0.1), transparent 72%),
    var(--ink);
}

.page-about .about-hero__inner {
  display: grid;
  gap: 18px;
  padding: clamp(24px, 5vw, 60px) 0 clamp(28px, 5vw, 54px);
}

.page-about .about-hero__eyebrow {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--cyan);
}

.page-about .about-hero__eyebrow span + span::before {
  content: "／";
  margin-right: 10px;
  color: var(--text-dim);
}

.page-about .about-hero__title {
  margin: 0;
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: clamp(30px, 6.6vw, 66px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .about-hero__title em {
  font-family: var(--font-serif);
  font-style: normal;
  font-weight: 700;
  color: var(--cyan);
}

.page-about .about-hero__lede {
  margin: 0;
  max-width: 34em;
  font-size: clamp(15px, 1.9vw, 18px);
  line-height: 1.7;
  color: var(--text);
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px 16px;
  margin: 10px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-stats__item {
  padding-top: 10px;
  border-top: 1px solid var(--line-strong);
}

.page-about .about-stats__num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: clamp(24px, 4vw, 34px);
  line-height: 1;
  color: var(--amber);
}

.page-about .about-stats__label {
  display: block;
  margin-top: 7px;
  font-size: 12px;
  letter-spacing: 0.02em;
  color: var(--text-dim);
}

/* ---------- 主体框架 ---------- */
.page-about .about-body {
  display: grid;
  gap: 26px;
  padding-top: clamp(28px, 4vw, 56px);
  padding-bottom: clamp(40px, 6vw, 80px);
}

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

.page-about .about-rail__head {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--text-dim);
}

.page-about .about-rail__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 6px;
  list-style: none;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}

.page-about .about-rail__list a {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  min-height: 44px;
  padding: 9px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 13px;
  color: var(--text);
  text-decoration: none;
  white-space: nowrap;
  transition: border-color 0.25s var(--ease), background 0.25s var(--ease), color 0.25s var(--ease);
}

.page-about .about-rail__list a:hover,
.page-about .about-rail__list a:focus-visible {
  border-color: var(--cyan);
  background: rgba(41, 224, 194, 0.08);
  color: var(--paper);
}

.page-about .about-rail__no {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--cyan);
}

.page-about .about-rail__year {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 500;
  color: var(--paper);
}

.page-about .about-rail__label {
  font-size: 12px;
  color: var(--text-dim);
}

.page-about .about-flow {
  display: grid;
  gap: clamp(36px, 6vw, 76px);
  min-width: 0;
}

/* ---------- 章节通用 ---------- */
.page-about .about-sec__kicker {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.24em;
  color: var(--amber);
}

.page-about .about-sec__title {
  margin: 0 0 16px;
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: clamp(22px, 3.6vw, 34px);
  line-height: 1.22;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-sec__lead {
  margin: 0 0 6px;
  max-width: 34em;
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-dim);
}

.page-about .about-sec__body p {
  margin: 0 0 14px;
  max-width: 36em;
  font-size: 15px;
  line-height: 1.78;
  color: var(--text);
}

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

/* ---------- 引言 ---------- */
.page-about .about-quote {
  margin: 24px 0 0;
  padding: 18px 18px 18px 22px;
  border-left: 2px solid var(--cyan);
  background: linear-gradient(90deg, rgba(41, 224, 194, 0.09), transparent 72%);
}

.page-about .about-quote p {
  margin: 0;
  font-family: var(--font-serif);
  font-size: clamp(17px, 2.6vw, 23px);
  line-height: 1.55;
  color: var(--paper);
}

.page-about .about-quote p::first-letter {
  float: left;
  margin: 2px 8px 0 0;
  font-size: 2.1em;
  line-height: 0.92;
  color: var(--cyan);
}

/* ---------- 三组分工 ---------- */
.page-about .about-crew {
  display: grid;
  gap: 12px;
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-crew__item {
  padding: 18px 16px 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(30, 77, 62, 0.44), rgba(10, 31, 26, 0.22));
  transition: border-color 0.25s var(--ease), transform 0.25s var(--ease), background 0.25s var(--ease);
}

.page-about .about-crew__item:hover,
.page-about .about-crew__item:focus-within {
  border-color: var(--cyan);
  background: linear-gradient(180deg, rgba(30, 77, 62, 0.62), rgba(10, 31, 26, 0.26));
  transform: translateY(-2px);
}

.page-about .about-crew__idx {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--cyan);
}

.page-about .about-crew__name {
  margin: 8px 0 8px;
  font-family: var(--font-sans);
  font-size: 17px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-crew__desc {
  margin: 0 0 12px;
  font-size: 13.5px;
  line-height: 1.72;
  color: var(--text);
}

.page-about .about-crew__meta {
  margin: 0;
  padding-top: 10px;
  border-top: 1px dashed var(--line);
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--amber);
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 24px 0 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--moss);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 12 / 7;
  object-fit: cover;
}

.page-about .about-figure--map img {
  aspect-ratio: 9 / 7;
}

.page-about .about-figure__cap {
  padding: 10px 14px;
  border-top: 1px solid var(--line);
  background: rgba(7, 20, 17, 0.72);
  font-size: 12px;
  line-height: 1.6;
  color: var(--text-dim);
}

/* ---------- 四条做法 ---------- */
.page-about .about-rules {
  display: grid;
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.page-about .about-rules__item {
  display: grid;
  gap: 6px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-rules__no {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--amber);
}

.page-about .about-rules__name {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 17px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-rules__text {
  margin: 0;
  max-width: 40em;
  font-size: 13.5px;
  line-height: 1.72;
  color: var(--text);
}

/* ---------- 版本刻度 ---------- */
.page-about .about-milestones {
  margin-inline: calc(var(--gutter) * -1);
  padding: clamp(28px, 5vw, 52px) var(--gutter) clamp(24px, 4vw, 40px);
  border-block: 1px solid var(--line);
  background: linear-gradient(170deg, var(--moss), var(--ink-deep) 78%);
}

.page-about .about-milestones__bg {
  margin: 4px 0 26px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-milestones__bg img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 5;
  object-fit: cover;
  opacity: 0.85;
}

.page-about .about-scale {
  display: grid;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-scale__node {
  position: relative;
  padding: 18px 0 18px 28px;
  border-bottom: 1px solid var(--line);
}

.page-about .about-scale__node:last-child {
  border-bottom: 0;
}

.page-about .about-scale__node::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 24px;
  width: 9px;
  height: 9px;
  border: 2px solid var(--ink-deep);
  border-radius: 50%;
  background: var(--line-strong);
}

.page-about .about-scale__node::after {
  content: "";
  position: absolute;
  left: 8px;
  top: 34px;
  bottom: 0;
  width: 1px;
  background: var(--line);
}

.page-about .about-scale__node:last-child::after {
  display: none;
}

.page-about .about-scale__node--current::before {
  background: var(--cyan);
  box-shadow: 0 0 0 5px rgba(41, 224, 194, 0.18);
}

.page-about .about-scale__node--current .about-scale__name {
  color: var(--cyan);
}

.page-about .about-scale__ver {
  display: block;
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: clamp(22px, 3.2vw, 30px);
  line-height: 1;
  color: var(--paper);
}

.page-about .about-scale__years {
  display: block;
  margin-top: 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--text-dim);
}

.page-about .about-scale__name {
  display: block;
  margin-top: 10px;
  font-size: 14px;
  font-weight: 700;
  color: var(--amber);
}

.page-about .about-scale__note {
  margin: 8px 0 0;
  max-width: 34em;
  font-size: 13px;
  line-height: 1.72;
  color: var(--text);
}

/* ---------- 标签带 ---------- */
.page-about .about-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-tags li {
  padding: 7px 13px;
  border: 1px solid var(--clay);
  border-radius: 999px;
  font-size: 12px;
  letter-spacing: 0.02em;
  color: var(--paper-dim);
}

/* ---------- 覆盖 ---------- */
.page-about .about-sec--split {
  display: grid;
  gap: 22px;
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  border-top: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(30, 77, 62, 0.52), var(--ink-deep));
}

.page-about .about-cta__inner {
  display: grid;
  gap: 18px;
  padding: clamp(28px, 5vw, 54px) 0;
}

.page-about .about-cta__title {
  margin: 0 0 8px;
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: clamp(20px, 3vw, 28px);
  line-height: 1.28;
  color: var(--paper);
}

.page-about .about-cta__sub {
  margin: 0;
  max-width: 32em;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--text-dim);
}

.page-about .about-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

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

  .page-about .about-crew {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 14px;
  }

  .page-about .about-rules__item {
    grid-template-columns: 62px 230px minmax(0, 1fr);
    align-items: baseline;
    gap: 0 22px;
  }

  .page-about .about-rules__no {
    grid-column: 1;
  }

  .page-about .about-rules__name {
    grid-column: 2;
  }

  .page-about .about-rules__text {
    grid-column: 3;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 960px) {
  .page-about .about-body {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: clamp(28px, 4vw, 56px);
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: 96px;
  }

  .page-about .about-rail__list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding-bottom: 0;
    border-left: 1px solid var(--line);
  }

  .page-about .about-rail__list a {
    position: relative;
    justify-content: flex-start;
    min-height: 40px;
    padding: 10px 0 10px 16px;
    border: 0;
    border-radius: 0;
  }

  .page-about .about-rail__list a::before {
    content: "";
    position: absolute;
    left: -1px;
    top: 9px;
    bottom: 9px;
    width: 2px;
    background: transparent;
    transition: background 0.25s var(--ease);
  }

  .page-about .about-rail__list a:hover::before,
  .page-about .about-rail__list a:focus-visible::before {
    background: var(--cyan);
  }

  .page-about .about-rail__list a:hover,
  .page-about .about-rail__list a:focus-visible {
    background: transparent;
  }

  .page-about .about-scale {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0 22px;
    border-top: 2px solid var(--line-strong);
  }

  .page-about .about-scale__node {
    padding: 28px 0 6px;
    border-bottom: 0;
  }

  .page-about .about-scale__node::before {
    left: 0;
    top: -8px;
  }

  .page-about .about-scale__node::after {
    display: none;
  }

  .page-about .about-sec--split {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    gap: 32px;
    align-items: start;
  }

  .page-about .about-figure--map {
    margin-top: 6px;
  }

  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 32px;
  }
}

@media (min-width: 1440px) {
  .page-about {
    --about-rail-w: 252px;
  }
}
<<<END>>>