/* ==========================================================
   品牌档案 / 页面作用域：.page-about
   ========================================================== */

.page-about {
  --about-rail: 200px;
  --about-rule: clamp(18px, 2.4vw, 28px);
  color: var(--silver);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  padding: clamp(26px, 4.5vw, 62px) 0 clamp(30px, 4vw, 56px);
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 56px);
}

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.45fr) minmax(0, 0.55fr);
    align-items: end;
  }
}

.page-about .about-hero h1 {
  margin: 14px 0 0;
  max-width: 760px;
  font-size: clamp(30px, 5.2vw, 56px);
  line-height: 1.12;
  letter-spacing: -0.025em;
  font-weight: 900;
  color: var(--cold-white);
}

.page-about .about-hero__dek {
  margin: clamp(18px, 2.4vw, 26px) 0 0;
  max-width: 640px;
  font-size: clamp(15px, 1.4vw, 17px);
  line-height: 1.85;
  color: var(--silver);
}

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

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

@media (min-width: 900px) {
  .page-about .about-hero__figure {
    padding-left: clamp(20px, 2.6vw, 36px);
    border-left: 1px solid var(--line);
  }
}

.page-about .about-hero__figure .figure-num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(76px, 12vw, 128px);
  line-height: 0.84;
  letter-spacing: -0.05em;
  font-weight: 700;
  color: var(--cold-white);
}

.page-about .about-hero__unit {
  margin: 8px 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--red);
}

.page-about .about-hero__facts {
  list-style: none;
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .about-hero__facts li {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  padding: 10px 0;
  border-bottom: 1px solid var(--line);
  font-size: 13px;
  line-height: 1.5;
}

.page-about .about-hero__facts-k {
  color: var(--silver);
  opacity: 0.78;
}

.page-about .about-hero__facts-v {
  font-family: var(--font-mono);
  color: var(--cold-white);
  white-space: nowrap;
}

/* ---------- 主体骨架：左索引 + 右正文 ---------- */

.page-about .about-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(30px, 4vw, 56px);
  padding-top: clamp(36px, 5vw, 68px);
  padding-bottom: clamp(48px, 6vw, 92px);
}

@media (min-width: 1024px) {
  .page-about .about-shell {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(36px, 4vw, 64px);
    align-items: start;
  }
}

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

@media (min-width: 1024px) {
  .page-about .about-rail {
    position: sticky;
    top: 92px;
  }
}

.page-about .about-rail__label {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--brass);
}

.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .about-rail__list a {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 7px 11px;
  border: 1px solid var(--line);
  color: var(--silver);
  font-size: 13px;
  text-decoration: none;
  transition: border-color 180ms ease, color 180ms ease;
}

.page-about .about-rail__list a:hover {
  border-color: var(--red);
  color: var(--cold-white);
}

.page-about .about-rail__idx {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--red);
}

@media (min-width: 1024px) {
  .page-about .about-rail__list {
    display: block;
  }

  .page-about .about-rail__list a {
    border: 0;
    border-left: 1px solid var(--line);
    padding: 8px 0 8px 12px;
    transition: border-color 180ms ease, color 180ms ease, padding-left 240ms ease;
  }

  .page-about .about-rail__list a:hover {
    border-left-color: var(--red);
    padding-left: 18px;
  }
}

.page-about .about-body {
  min-width: 0;
  display: grid;
  gap: clamp(44px, 5.5vw, 80px);
}

/* ---------- 章节通用 ---------- */

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

.page-about .about-sec__head {
  max-width: 730px;
}

.page-about .about-sec .sec-title {
  margin: 10px 0 0;
  font-size: clamp(23px, 3vw, 36px);
  line-height: 1.24;
  letter-spacing: -0.02em;
  font-weight: 900;
  color: var(--cold-white);
}

.page-about .about-sec p {
  margin: 16px 0 0;
  max-width: 620px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--silver);
}

.page-about .about-sec .about-lede {
  font-size: 17px;
  color: var(--cold-white);
}

/* ---------- 图片 ---------- */

.page-about .about-fig {
  margin: clamp(24px, 3vw, 38px) 0 0;
}

.page-about .about-fig__frame {
  border: 1px solid var(--line-strong);
  background: var(--blue-steel);
  overflow: hidden;
  aspect-ratio: 3 / 2;
}

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

.page-about .about-fig__cap {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--silver);
  opacity: 0.7;
}

/* ---------- 时间线 ---------- */

.page-about .timeline {
  list-style: none;
  margin: clamp(28px, 3.6vw, 46px) 0 0;
  padding: 0 0 0 var(--about-rule);
  border-left: 1px solid var(--line-strong);
  display: grid;
  gap: clamp(24px, 3vw, 36px);
}

.page-about .tl-node {
  position: relative;
  min-width: 0;
}

.page-about .tl-node::before {
  content: "";
  position: absolute;
  left: calc(var(--about-rule) * -1 - 5px);
  top: 8px;
  width: 9px;
  height: 9px;
  background: var(--blue-deep);
  border: 1px solid var(--red);
  transform: rotate(45deg);
}

.page-about .tl-node__year {
  display: block;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--red);
}

.page-about .tl-node__title {
  margin: 6px 0 0;
  font-size: clamp(17px, 1.5vw, 20px);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--cold-white);
}

/* ---------- 五类比例图 ---------- */

.page-about .cluster-chart {
  list-style: none;
  margin: clamp(26px, 3.2vw, 40px) 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .cluster {
  min-width: 0;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .cluster__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
}

.page-about .cluster__name {
  font-size: 15px;
  letter-spacing: -0.01em;
  color: var(--cold-white);
}

.page-about .cluster__count {
  font-family: var(--font-mono);
  font-size: 22px;
  line-height: 1;
  color: var(--cold-white);
}

.page-about .cluster__bar {
  display: block;
  max-width: 100%;
  height: 7px;
  margin-top: 12px;
  background: var(--red);
  transition: opacity 180ms ease;
}

.page-about .cluster:hover .cluster__bar {
  opacity: 0.7;
}

.page-about .cluster--a .cluster__bar { width: 100%; }
.page-about .cluster--b .cluster__bar { width: 77%; }
.page-about .cluster--c .cluster__bar { width: 71%; }
.page-about .cluster--d .cluster__bar { width: 48%; }
.page-about .cluster--e .cluster__bar { width: 29%; }

.page-about .about-sec .cluster__note {
  margin: 10px 0 0;
  font-size: 13px;
  line-height: 1.6;
  color: var(--silver);
  opacity: 0.78;
}

/* ---------- 档案编号构成 ---------- */

.page-about .code-card {
  margin-top: clamp(26px, 3.2vw, 38px);
  padding: clamp(20px, 2.8vw, 32px);
  background: var(--blue-steel);
  border: 1px solid var(--line-strong);
  border-left: 3px solid var(--red);
}

.page-about .about-sec .code-card__label {
  margin: 0;
  max-width: none;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--brass);
}

.page-about .about-sec .code-card__demo {
  margin: 14px 0 0;
  max-width: none;
  font-family: var(--font-mono);
  font-size: clamp(28px, 4.4vw, 46px);
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--cold-white);
  overflow-wrap: anywhere;
}

.page-about .code-card__demo em {
  font-style: normal;
  color: var(--red);
}

.page-about .code-card__legend {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

@media (min-width: 640px) {
  .page-about .code-card__legend {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .code-card__key {
  display: block;
  margin-bottom: 4px;
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--red);
}

.page-about .code-card__val {
  display: block;
  font-size: 13px;
  line-height: 1.7;
  color: var(--silver);
}

/* ---------- 折叠问答 ---------- */

.page-about .about-acc {
  margin-top: clamp(24px, 3vw, 34px);
}

/* ---------- 团队：档案纸区块 ---------- */

.page-about .about-sec--paper {
  background: var(--paper);
  border-top: 3px solid var(--red);
  padding: clamp(24px, 3.2vw, 44px);
}

.page-about .about-sec--paper .eyebrow {
  color: var(--copper);
}

.page-about .about-sec--paper .sec-title {
  color: var(--ink);
}

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

.page-about .team-bar {
  display: grid;
  grid-template-columns: 23fr 18fr 12fr 9fr;
  gap: 3px;
  height: 18px;
  margin: clamp(26px, 3.2vw, 38px) 0 clamp(20px, 2.6vw, 28px);
}

.page-about .team-bar span {
  display: block;
  height: 100%;
}

.page-about .team-bar span:nth-child(1) { background: var(--red); }
.page-about .team-bar span:nth-child(2) { background: var(--copper); }
.page-about .team-bar span:nth-child(3) { background: var(--std-blue); }
.page-about .team-bar span:nth-child(4) { background: var(--ink-soft); }

.page-about .team-legend {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

@media (min-width: 640px) {
  .page-about .team-legend {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.page-about .team-legend li {
  display: grid;
  grid-template-columns: 12px minmax(0, 1fr) auto;
  align-items: center;
  gap: 12px;
  padding-bottom: 12px;
  border-bottom: 1px solid rgba(11, 27, 43, 0.14);
  font-size: 15px;
  color: var(--ink);
}

.page-about .team-legend__dot {
  display: block;
  width: 12px;
  height: 12px;
}

.page-about .team-legend li:nth-child(1) .team-legend__dot { background: var(--red); }
.page-about .team-legend li:nth-child(2) .team-legend__dot { background: var(--copper); }
.page-about .team-legend li:nth-child(3) .team-legend__dot { background: var(--std-blue); }
.page-about .team-legend li:nth-child(4) .team-legend__dot { background: var(--ink-soft); }

.page-about .team-legend__role {
  min-width: 0;
}

.page-about .team-legend__num {
  font-family: var(--font-mono);
  font-size: 17px;
  color: var(--ink);
}

/* ---------- 图文左右分栏 ---------- */

.page-about .about-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3vw, 40px);
  margin-top: clamp(24px, 3vw, 36px);
  align-items: start;
}

.page-about .about-split > * {
  min-width: 0;
}

.page-about .about-split p:first-child {
  margin-top: 0;
}

.page-about .about-split .about-fig {
  margin-top: 0;
}

@media (min-width: 860px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: clamp(28px, 3.4vw, 52px);
  }

  .page-about .about-split--flip .about-fig {
    order: -1;
  }
}

/* ---------- 结尾引导 ---------- */

.page-about .about-cta {
  background: var(--blue-steel);
  border-top: 1px solid var(--line-strong);
  padding: clamp(38px, 5vw, 72px) 0;
}

.page-about .about-cta__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3vw, 40px);
  align-items: center;
}

@media (min-width: 860px) {
  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1.2fr) auto;
  }
}

.page-about .about-cta h2 {
  margin: 0;
  font-size: clamp(22px, 2.8vw, 34px);
  line-height: 1.24;
  letter-spacing: -0.02em;
  font-weight: 900;
  color: var(--cold-white);
}

.page-about .about-cta p {
  margin: 12px 0 0;
  max-width: 560px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--silver);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}
<<<END>>>