/* ===== 品牌概况 · 页面作用域 ===== */
.page-about {
  --about-scale-w: 92px;
}

.page-about [id] {
  scroll-margin-top: calc(var(--header-h) + 26px);
}

.page-about .section {
  padding-block: clamp(52px, 7vw, 88px);
}

.page-about .about-crumb {
  padding-top: calc(var(--header-h) + 18px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-block: clamp(26px, 4vw, 48px) clamp(48px, 6vw, 74px);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(30px, 5vw, 54px);
}

.page-about .about-hero h1 {
  margin: 16px 0 0;
  max-width: 14ch;
}

.page-about .about-hero .lede {
  margin-top: 22px;
  max-width: 36em;
}

.page-about .about-hero__note {
  margin-top: 26px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 14px;
  line-height: 1.9;
  max-width: 40em;
}

.page-about .jump-card {
  position: relative;
  border: 1px solid var(--line);
  background: var(--ink-2);
  padding: 22px 22px 18px;
  box-shadow: 7px 7px 0 0 rgba(28, 58, 82, 0.5);
}

.page-about .jump-list {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
}

.page-about .jump-list a {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 11px 2px;
  border-bottom: 1px solid var(--line);
  color: var(--text);
  text-decoration: none;
  font-size: 15px;
  transition: color var(--t) var(--ease), border-color var(--t) var(--ease);
}

.page-about .jump-list li:last-child a {
  border-bottom: none;
}

.page-about .jump-list a:hover,
.page-about .jump-list a[aria-current] {
  color: var(--neon-soft);
  border-bottom-color: var(--neon);
}

.page-about .jump-list .num {
  font-size: 12px;
}

/* ---------- 通用小节标题 ---------- */
.page-about .about-head {
  max-width: 54em;
}

.page-about .about-head h2 {
  margin: 12px 0 0;
}

.page-about .about-head .lede {
  margin-top: 18px;
}

/* ---------- 时间线 ---------- */
.page-about .tl-media {
  margin: clamp(30px, 4vw, 46px) 0 clamp(28px, 4vw, 44px);
}

.page-about .tl {
  margin-top: clamp(24px, 3vw, 36px);
}

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

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

.page-about .tl__item {
  position: relative;
  padding-left: 24px;
  padding-bottom: 34px;
  border-left: 1px solid var(--line);
}

.page-about .tl__item:last-child {
  border-left-color: transparent;
  padding-bottom: 0;
}

.page-about .tl__item::before {
  content: "";
  position: absolute;
  left: -4px;
  top: 8px;
  width: 7px;
  height: 7px;
  background: var(--ink);
  border: 1px solid var(--line);
  transition: border-color var(--t) var(--ease), background-color var(--t) var(--ease);
}

.page-about .tl__item:hover::before {
  background: var(--neon);
  border-color: var(--neon);
}

.page-about .tl__stamp {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 10px;
  margin: 0 0 8px;
}

.page-about .tl__year {
  font-size: 22px;
  letter-spacing: 0.02em;
}

.page-about .tl__phase {
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--muted);
}

.page-about .tl__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: clamp(18px, 2.1vw, 22px);
  font-weight: 700;
  letter-spacing: 0.01em;
  line-height: 1.4;
}

.page-about .tl__text {
  margin: 0;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.85;
  max-width: 44em;
}

/* ---------- 分类体量 ---------- */
.page-about .scale-grid {
  display: grid;
  gap: 1px;
  margin-top: clamp(28px, 4vw, 44px);
  border: 1px solid var(--line);
  background: var(--line);
}

.page-about .scale-cell {
  background: var(--ink);
  padding: 24px 22px 26px;
}

.page-about .scale-num {
  display: block;
  font-family: var(--font-num);
  font-size: clamp(34px, 6vw, 48px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.01em;
}

.page-about .scale-cap {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--text);
}

.page-about .scale-desc {
  margin: 8px 0 0;
  font-size: 13px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-scale-note {
  margin-top: clamp(26px, 4vw, 40px);
}

/* ---------- 三个内容小组 ---------- */
.page-about .team-layout {
  display: grid;
  gap: clamp(28px, 4vw, 44px);
  margin-top: clamp(28px, 4vw, 44px);
}

.page-about .team-blocks {
  display: grid;
  gap: 14px;
}

.page-about .team-card {
  border: 1px solid var(--line);
  background: rgba(6, 18, 31, 0.55);
  transition: border-color var(--t) var(--ease);
}

.page-about .team-card:hover,
.page-about .team-card[open] {
  border-color: var(--neon);
}

.page-about .team-card > summary {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  padding: 20px 22px;
  cursor: pointer;
  list-style: none;
}

.page-about .team-card > summary::-webkit-details-marker {
  display: none;
}

.page-about .team-card > summary::after {
  content: "+";
  font-family: var(--font-num);
  font-size: 16px;
  line-height: 1;
  color: var(--neon);
  transition: color var(--t) var(--ease);
}

.page-about .team-card[open] > summary::after {
  content: "−";
  color: var(--amber);
}

.page-about .team-name {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.page-about .team-card .fold__body {
  padding: 0 22px 22px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .team-card .fold__body p {
  margin: 0;
}

/* ---------- 维护边界 ---------- */
.page-about .bounds {
  margin-top: clamp(28px, 4vw, 44px);
  border-top: 1px solid var(--line);
}

.page-about .bound {
  display: grid;
  gap: 8px;
  padding: 22px 0;
  border-bottom: 1px solid var(--line);
  transition: border-color var(--t) var(--ease);
}

.page-about .bound:hover {
  border-bottom-color: var(--neon);
}

.page-about .bound__name {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.page-about .bound__dot {
  width: 6px;
  height: 6px;
  flex: none;
  background: var(--magenta);
}

.page-about .bound__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .about-links {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 30px;
  margin: clamp(26px, 4vw, 40px) 0 0;
  padding-top: 24px;
  border-top: 1px solid var(--line);
}

/* ---------- 长期可查 ---------- */
.page-about .promise {
  position: relative;
  isolation: isolate;
  overflow: hidden;
}

.page-about .promise__bg {
  position: absolute;
  inset: 0;
  z-index: -1;
}

.page-about .promise__bg img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.24;
}

.page-about .promise__bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(198deg, rgba(58, 19, 47, 0.74), rgba(6, 18, 31, 0.94) 74%);
}

.page-about .promise__list {
  list-style: none;
  margin: clamp(28px, 4vw, 42px) 0 0;
  padding: 0;
  display: grid;
  gap: 18px;
  max-width: 46em;
}

.page-about .promise__list > li {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 14px;
  align-items: start;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--line);
}

.page-about .promise__list > li:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.page-about .promise__mark {
  width: 8px;
  height: 8px;
  margin-top: 8px;
  background: var(--amber);
  flex: none;
}

.page-about .promise__title {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--text);
}

.page-about .promise__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--muted);
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-about .scale-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 820px) {
  .page-about .bound {
    grid-template-columns: 230px 1fr;
    gap: 8px 30px;
    align-items: baseline;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: 7fr 5fr;
    align-items: start;
  }

  .page-about .team-layout {
    grid-template-columns: 5fr 7fr;
    align-items: start;
  }

  .page-about .team-media {
    grid-column: 1;
    grid-row: 1;
  }

  .page-about .team-blocks {
    grid-column: 2;
    grid-row: 1;
  }

  .page-about .team-card:nth-child(2) {
    margin-left: 30px;
  }

  .page-about .team-card:nth-child(3) {
    margin-left: 12px;
  }
}

@media (min-width: 960px) {
  .page-about .tl {
    display: grid;
    grid-template-columns: var(--about-scale-w) 1fr;
    gap: 0 clamp(30px, 4vw, 56px);
  }

  .page-about .tl__scale {
    display: block;
    position: sticky;
    top: calc(var(--header-h) + 32px);
    align-self: start;
    list-style: none;
    margin: 0;
    padding: 0;
  }

  .page-about .tl__scale a {
    display: block;
    padding: 9px 0 9px 14px;
    border-left: 2px solid var(--line);
    font-family: var(--font-num);
    font-size: 13px;
    letter-spacing: 0.06em;
    color: var(--muted);
    text-decoration: none;
    transition: color var(--t) var(--ease), border-color var(--t) var(--ease);
  }

  .page-about .tl__scale a:hover {
    color: var(--neon-soft);
    border-left-color: var(--neon);
  }

  .page-about .tl__scale a[aria-current] {
    color: var(--amber);
    border-left-color: var(--amber);
  }

  .page-about .tl__stamp .tl__year {
    font-size: 24px;
  }
}
<<<END>>>