/* ===== 品牌档案 · 页面专属样式（作用域 .page-about） ===== */

.page-about {
  --about-line: rgba(143, 166, 184, 0.22);
  --about-navy-soft: rgba(13, 42, 69, 0.6);
  display: block;
  background-color: var(--deep);
  color: var(--cream);
  overflow-x: hidden;
  padding-bottom: clamp(40px, 8vw, 96px);
}

/* ---------- 面包屑 ---------- */
.page-about .crumbs {
  padding-top: 20px;
  padding-bottom: 4px;
}

.page-about .crumbs ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--gray);
}

.page-about .crumbs li + li::before {
  content: "/";
  color: rgba(143, 166, 184, 0.5);
}

.page-about .crumbs a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.18s ease;
}

.page-about .crumbs a:hover,
.page-about .crumbs a:focus-visible {
  border-bottom-color: var(--cyan);
}

/* ---------- 首屏 ---------- */
.page-about .about-mast {
  display: grid;
  gap: 26px;
  padding-block: 30px 44px;
  border-bottom: 2px solid var(--navy);
}

.page-about .about-mast h1 {
  font-family: var(--font-display);
  font-size: clamp(2rem, 6.3vw, 4.2rem);
  line-height: 1.06;
  letter-spacing: -0.01em;
  margin: 14px 0 18px;
  color: var(--cream);
}

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

.page-about .about-mast__lede {
  margin: 0;
  max-width: 48ch;
  font-size: clamp(15px, 2.1vw, 17px);
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-mast__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.page-about .about-mast__facts {
  border: 2px solid var(--cyan);
  background: var(--navy);
  padding: 20px 18px;
  box-shadow: var(--shadow-panel);
}

.page-about .about-mast__facts-title {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  margin: 14px 0 0;
  background: var(--about-line);
  border: 1px solid var(--about-line);
}

.page-about .about-stats > div {
  background: var(--navy);
  padding: 12px 10px;
}

.page-about .about-stats dt {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--gray);
}

.page-about .about-stats dd {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(17px, 2.6vw, 21px);
  line-height: 1.2;
  color: var(--glass);
}

.page-about .about-mast__facts-note {
  margin: 16px 0 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--gray);
}

/* ---------- 章节区块 ---------- */
.page-about .about-block {
  padding-block: clamp(34px, 6.5vw, 72px);
  border-bottom: 2px solid var(--navy);
}

.page-about .about-block--last {
  border-bottom: none;
}

.page-about .about-head {
  display: grid;
  gap: 10px;
  margin-bottom: clamp(20px, 3.6vw, 34px);
}

.page-about .about-head h2 {
  margin: 0;
  max-width: 22ch;
  font-family: var(--font-display);
  font-size: clamp(1.45rem, 4vw, 2.4rem);
  line-height: 1.2;
  color: var(--cream);
}

.page-about .about-head__lead {
  margin: 0;
  max-width: 62ch;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--mist);
}

/* ---------- 通用双栏 ---------- */
.page-about .about-split {
  display: grid;
  gap: 24px;
}

.page-about .about-copy p {
  margin: 0 0 14px;
  max-width: 64ch;
  font-size: 15.5px;
  line-height: 1.88;
  color: var(--mist);
}

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

.page-about .about-side {
  display: grid;
  gap: 18px;
  align-content: start;
}

.page-about .about-facts {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 2px solid var(--navy);
}

.page-about .about-facts li {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 12px 0;
  border-bottom: 2px solid var(--navy);
  font-size: 14.5px;
  line-height: 1.6;
  color: var(--mist);
}

.page-about .about-facts .mono-num {
  flex: 0 0 auto;
  min-width: 66px;
  font-family: var(--font-mono);
  font-size: 18px;
  color: var(--cyan);
}

/* ---------- 时间线 ---------- */
.page-about .about-media {
  margin: 0 0 clamp(22px, 4vw, 36px);
}

.page-about .about-timeline {
  position: relative;
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 18px;
}

.page-about .about-timeline__item {
  display: grid;
  gap: 10px;
}

.page-about .about-timeline__year {
  font-family: var(--font-mono);
  font-size: 19px;
  letter-spacing: 0.05em;
  color: var(--cyan);
  transition: color 0.2s ease, transform 0.2s ease;
}

.page-about .about-timeline__card {
  border: 2px solid var(--navy);
  background: var(--about-navy-soft);
  padding: 16px 18px;
  box-shadow: 4px 4px 0 rgba(28, 21, 18, 0.45);
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.page-about .about-timeline__item:hover .about-timeline__card,
.page-about .about-timeline__item:focus-within .about-timeline__card {
  border-color: var(--cyan);
  transform: translate(-2px, -2px);
}

.page-about .about-timeline__item:hover .about-timeline__year,
.page-about .about-timeline__item:focus-within .about-timeline__year {
  color: var(--yellow);
}

.page-about .about-timeline__card h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: clamp(1rem, 2.4vw, 1.22rem);
  line-height: 1.4;
  color: var(--cream);
}

.page-about .about-timeline__card p {
  margin: 0;
  font-size: 14.8px;
  line-height: 1.82;
  color: var(--mist);
}

.page-about .about-timeline__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 13px 0 0;
  padding: 0;
  list-style: none;
}

/* ---------- 资料形态 ---------- */
.page-about .about-forms {
  display: grid;
  gap: 14px;
  margin-top: clamp(24px, 4vw, 40px);
}

.page-about .about-form {
  position: relative;
  border: 2px solid var(--navy);
  border-left: 6px solid var(--coral);
  background: rgba(13, 42, 69, 0.45);
  padding: 16px 18px;
  transition: background-color 0.2s ease, border-left-color 0.2s ease;
}

.page-about .about-form:hover {
  background: rgba(13, 42, 69, 0.85);
  border-left-color: var(--cyan);
}

.page-about .about-form__num {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--gray);
}

.page-about .about-form h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 1.05rem;
  line-height: 1.4;
  color: var(--glass);
}

.page-about .about-form p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--mist);
}

/* ---------- 五组栏目 ---------- */
.page-about .about-nav-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 1px;
  background: var(--navy);
  border: 2px solid var(--navy);
}

.page-about .about-nav-item {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  gap: 14px;
  align-items: start;
  padding: 16px 16px;
  background: var(--deep);
  transition: background-color 0.2s ease;
}

.page-about .about-nav-item:hover {
  background: var(--navy);
}

.page-about .about-nav-item__idx {
  font-family: var(--font-mono);
  font-size: 15px;
  line-height: 1.6;
  color: var(--cyan);
}

.page-about .about-nav-item__body h3 {
  margin: 0 0 7px;
  font-family: var(--font-display);
  font-size: 1.02rem;
  line-height: 1.45;
  color: var(--cream);
}

.page-about .about-nav-item__body h3 a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 242, 208, 0.35);
}

.page-about .about-nav-item__body h3 a:hover,
.page-about .about-nav-item__body h3 a:focus-visible {
  border-bottom-color: var(--cyan);
}

.page-about .about-nav-item__body p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--mist);
}

/* ---------- 覆盖与协作 ---------- */
.page-about .about-coverage {
  margin-top: clamp(6px, 2vw, 18px);
}

.page-about .about-coverage__cell {
  border: 2px solid var(--navy);
  background: rgba(13, 42, 69, 0.5);
  padding: 18px;
}

.page-about .about-coverage__cell h3 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 1.02rem;
  line-height: 1.4;
  color: var(--glass);
}

.page-about .about-coverage__cell p {
  margin: 0;
  font-size: 14.6px;
  line-height: 1.82;
  color: var(--mist);
}

/* ---------- 会员权益 ---------- */
.page-about .about-benefits {
  display: grid;
  gap: 14px;
}

.page-about .about-benefit {
  border: 2px solid var(--cyan);
  background: linear-gradient(160deg, rgba(53, 242, 208, 0.1), rgba(13, 42, 69, 0.85));
  padding: 18px;
  box-shadow: 5px 5px 0 rgba(53, 242, 208, 0.14);
}

.page-about .about-benefit h3 {
  margin: 0 0 9px;
  font-family: var(--font-display);
  font-size: 1.08rem;
  line-height: 1.4;
  color: var(--cream);
}

.page-about .about-benefit p {
  margin: 0;
  font-size: 14.6px;
  line-height: 1.82;
  color: var(--mist);
}

/* ---------- 收尾行动区 ---------- */
.page-about .about-cta {
  display: grid;
  gap: 20px;
  margin-top: clamp(26px, 4.5vw, 46px);
  padding: clamp(20px, 3.5vw, 32px);
  border: 2px solid var(--coral);
  background: var(--navy);
  box-shadow: var(--shadow-coral);
}

.page-about .about-cta__text h3 {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-size: clamp(1.15rem, 3vw, 1.6rem);
  line-height: 1.35;
  color: var(--cream);
}

.page-about .about-cta__text p {
  margin: 0;
  max-width: 68ch;
  font-size: 14.6px;
  line-height: 1.85;
  color: var(--mist);
}

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

/* ---------- 平板及以上 ---------- */
@media (min-width: 760px) {
  .page-about .about-mast {
    padding-block: 44px 60px;
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 0.8fr);
    gap: 40px;
    align-items: start;
  }

  .page-about .about-split--reverse {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.3fr);
  }

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

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

  .page-about .about-timeline {
    gap: 22px;
  }

  .page-about .about-timeline__item {
    position: relative;
    grid-template-columns: 132px minmax(0, 1fr);
    gap: 26px;
    align-items: start;
  }

  .page-about .about-timeline__item::before {
    content: "";
    position: absolute;
    left: 131px;
    top: 8px;
    bottom: -22px;
    width: 2px;
    background: rgba(53, 242, 208, 0.24);
  }

  .page-about .about-timeline__item::after {
    content: "";
    position: absolute;
    left: 126px;
    top: 24px;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--deep);
    border: 2px solid var(--cyan);
    box-sizing: border-box;
  }

  .page-about .about-timeline__item:last-child::before {
    background: linear-gradient(180deg, rgba(53, 242, 208, 0.24), rgba(53, 242, 208, 0));
  }

  .page-about .about-timeline__year {
    padding-top: 14px;
    text-align: right;
  }

  .page-about .about-cta {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 0.9fr);
    align-items: center;
    gap: 36px;
  }
}

/* ---------- 桌面宽屏 ---------- */
@media (min-width: 1100px) {
  .page-about .about-mast {
    grid-template-columns: minmax(0, 1.5fr) minmax(300px, 0.85fr);
    gap: 52px;
  }

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

  .page-about .about-nav-item {
    grid-template-columns: 60px minmax(0, 1fr);
    padding: 20px 22px;
  }

  .page-about .about-copy p {
    font-size: 16px;
  }
}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-timeline__card,
  .page-about .about-timeline__year,
  .page-about .about-form,
  .page-about .about-nav-item {
    transition: none;
  }

  .page-about .about-timeline__item:hover .about-timeline__card,
  .page-about .about-timeline__item:focus-within .about-timeline__card {
    transform: none;
  }
}
<<<END>>>