.page-about {
  --about-line: #D6E0E2;
  --about-line-brass: rgba(200, 150, 62, 0.42);
  --about-body-text: #26323C;
  --about-rail-w: 196px;
  --about-side-w: 216px;
  background: var(--mist);
  color: var(--about-body-text);
  overflow-x: hidden;
}

.page-about [id] {
  scroll-margin-top: calc(var(--topbar-h) + 24px);
}

.page-about .about-crumb {
  max-width: var(--shell-max);
  margin-inline: auto;
  padding: 0 var(--gutter) 20px;
}

.page-about .about-crumb .breadcrumb__link,
.page-about .about-crumb .breadcrumb__current,
.page-about .about-crumb .breadcrumb__sep {
  color: var(--silver);
}

.page-about .about-crumb .breadcrumb__current {
  color: var(--brass);
}

/* ---------- hero ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  padding-top: clamp(24px, 4vw, 44px);
  padding-bottom: clamp(40px, 6vw, 76px);
  background:
    linear-gradient(158deg, #102234 0%, var(--indigo) 52%, #17314A 100%);
  color: var(--mist);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -30% -18% auto auto;
  width: min(760px, 78%);
  aspect-ratio: 1 / 1;
  background: repeating-radial-gradient(circle at 62% 38%, rgba(47, 212, 194, 0.11) 0 1px, transparent 1px 28px);
  pointer-events: none;
  z-index: -1;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: -12%;
  bottom: -38%;
  width: 56%;
  aspect-ratio: 1 / 1;
  border-radius: 44% 56% 62% 38% / 52% 42% 58% 48%;
  background: radial-gradient(circle at 40% 40%, rgba(46, 111, 142, 0.55), transparent 68%);
  pointer-events: none;
  z-index: -1;
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 52px);
  max-width: var(--shell-max);
  margin-inline: auto;
  padding: 0 var(--gutter);
  align-items: center;
}

.page-about .about-hero__eyebrow {
  color: var(--brass);
  letter-spacing: 0.22em;
  margin: 0 0 14px;
}

.page-about .about-hero h1 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2rem, 6.4vw, 4.1rem);
  line-height: 1.12;
  letter-spacing: -0.01em;
  margin: 0 0 20px;
  color: #FFFFFF;
  text-wrap: balance;
}

.page-about .about-hero__lead {
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.85;
  color: rgba(244, 247, 248, 0.84);
  max-width: 34em;
  margin: 0 0 26px;
}

.page-about .about-hero__meta {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  border-top: 1px solid var(--line-brass);
  padding-top: 18px;
}

.page-about .about-hero__meta-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 0;
}

.page-about .about-hero__meta-num {
  font-size: clamp(1.35rem, 3vw, 1.9rem);
  font-weight: 800;
  color: var(--aqua);
  line-height: 1;
}

.page-about .about-hero__meta-label {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--silver);
}

.page-about .about-hero__visual {
  padding: clamp(8px, 2vw, 20px);
  background: rgba(11, 22, 32, 0.42);
  border: 1px solid rgba(201, 214, 216, 0.14);
  border-radius: var(--radius-organic);
}

.page-about .yearscale {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(6px, 1.2vw, 11px);
}

.page-about .yearscale__item {
  display: flex;
  align-items: center;
  gap: 12px;
}

.page-about .yearscale__y {
  font-family: var(--font-mono);
  font-size: clamp(12px, 1.4vw, 14px);
  font-weight: 700;
  letter-spacing: 0.08em;
  color: rgba(244, 247, 248, 0.62);
  flex: 0 0 auto;
}

.page-about .yearscale__bar {
  flex: 1 1 auto;
  height: 2px;
  border-radius: 2px;
  background: linear-gradient(90deg, rgba(200, 150, 62, 0.75), rgba(47, 212, 194, 0.55), transparent);
  transform-origin: left center;
  transition: opacity 0.3s ease;
}

.page-about .yearscale__item:nth-child(1) .yearscale__bar { width: 30%; flex: 0 0 30%; }
.page-about .yearscale__item:nth-child(2) .yearscale__bar { width: 36%; flex: 0 0 36%; }
.page-about .yearscale__item:nth-child(3) .yearscale__bar { width: 42%; flex: 0 0 42%; }
.page-about .yearscale__item:nth-child(4) .yearscale__bar { width: 48%; flex: 0 0 48%; }
.page-about .yearscale__item:nth-child(5) .yearscale__bar { width: 55%; flex: 0 0 55%; }
.page-about .yearscale__item:nth-child(6) .yearscale__bar { width: 62%; flex: 0 0 62%; }
.page-about .yearscale__item:nth-child(7) .yearscale__bar { width: 70%; flex: 0 0 70%; }
.page-about .yearscale__item:nth-child(8) .yearscale__bar { width: 78%; flex: 0 0 78%; }
.page-about .yearscale__item:nth-child(9) .yearscale__bar { width: 88%; flex: 0 0 88%; }
.page-about .yearscale__item:nth-child(10) .yearscale__bar { width: 100%; flex: 0 0 100%; }

.page-about .yearscale__item:nth-child(9) .yearscale__y,
.page-about .yearscale__item:nth-child(10) .yearscale__y {
  color: var(--brass);
}

/* ---------- 主体栅格 ---------- */
.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 40px);
  max-width: var(--shell-max);
  margin-inline: auto;
  padding: clamp(28px, 4.5vw, 56px) var(--gutter) clamp(48px, 7vw, 96px);
}

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

.page-about .about-index__cap {
  font-size: 11px;
  letter-spacing: 0.28em;
  color: var(--grey);
  margin: 0 0 10px;
}

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

.page-about .about-index__list::-webkit-scrollbar {
  display: none;
}

.page-about .about-index__link {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: 7px 12px;
  white-space: nowrap;
  text-decoration: none;
  color: #46545E;
  font-size: 13px;
  border: 1px solid var(--about-line);
  border-radius: 999px;
  background: #FFFFFF;
  transition: color 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  border-color: var(--brass);
  color: var(--indigo);
}

.page-about .about-index__link.is-current {
  background: var(--indigo);
  border-color: var(--indigo);
  color: var(--warm);
}

.page-about .about-index__num {
  font-size: 11px;
  color: var(--brass);
  font-weight: 700;
}

.page-about .about-index__link.is-current .about-index__num {
  color: var(--aqua);
}

/* ---------- 章节 ---------- */
.page-about .about-flow {
  display: grid;
  gap: clamp(6px, 1vw, 12px);
  min-width: 0;
}

.page-about .about-sec {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(16px, 2.6vw, 30px);
  padding-block: clamp(26px, 4vw, 44px);
  border-top: 1px solid var(--about-line);
}

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

.page-about .about-sec__num {
  display: block;
  font-size: clamp(1.9rem, 5vw, 3.1rem);
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.02em;
  color: transparent;
  -webkit-text-stroke: 1px var(--brass);
  margin-bottom: 8px;
}

.page-about .about-sec__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.32rem, 3.4vw, 2rem);
  line-height: 1.28;
  color: var(--indigo);
  margin: 0 0 16px;
  text-wrap: balance;
}

.page-about .about-sec .prose {
  color: var(--about-body-text);
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.9;
}

.page-about .about-sec .prose p {
  margin: 0 0 14px;
}

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

.page-about .about-sec__more {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
  margin-top: 20px;
}

.page-about .about-link {
  font-size: 14px;
  color: var(--silver-blue);
  text-decoration: none;
  border-bottom: 1px solid var(--about-line-brass);
  padding-bottom: 2px;
}

.page-about .about-link:hover,
.page-about .about-link:focus-visible {
  color: var(--red);
  border-bottom-color: var(--red);
}

/* ---------- 旁注 ---------- */
.page-about .about-sec__side {
  min-width: 0;
}

.page-about .side-card {
  background: var(--warm);
  border-left: 2px solid var(--brass);
  border-radius: var(--radius-organic);
  padding: 16px 18px;
  box-shadow: 0 10px 26px rgba(18, 38, 58, 0.06);
}

.page-about .side-card__title {
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--silver-blue);
  margin: 0 0 10px;
  font-weight: 700;
}

.page-about .side-card__text {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: #4A5862;
}

.page-about .side-card__list {
  margin: 0;
  display: grid;
  gap: 7px;
}

.page-about .side-card__row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 10px;
  border-bottom: 1px dashed rgba(124, 140, 143, 0.32);
  padding-bottom: 6px;
}

.page-about .side-card__row:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .side-card__row dt {
  font-size: 12.5px;
  color: #55636D;
  line-height: 1.5;
}

.page-about .side-card__row dd {
  margin: 0;
  font-size: 13px;
  font-weight: 700;
  color: var(--indigo);
  white-space: nowrap;
}

.page-about .side-card__ticks {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 8px;
  font-size: 13px;
  line-height: 1.65;
  color: #4A5862;
}

.page-about .side-card__ticks .mono {
  display: inline-block;
  min-width: 1.6em;
  color: var(--red);
  font-weight: 700;
  margin-right: 4px;
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 22px 0 4px;
  border-radius: var(--radius-organic);
  overflow: hidden;
  border: 1px solid var(--about-line);
  background: var(--indigo);
}

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

.page-about .about-figure__cap {
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--grey);
  padding: 9px 12px;
  background: var(--warm);
  border-top: 1px solid var(--about-line);
}

/* ---------- 团队数字块 ---------- */
.page-about .team {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
  margin-top: 18px;
}

.page-about .team__cell {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 14px 12px;
  border-radius: var(--radius-organic);
  min-width: 0;
}

.page-about .team__cell--a {
  background: var(--indigo);
  color: var(--mist);
}

.page-about .team__cell--b {
  background: var(--silver-blue);
  color: #FFFFFF;
}

.page-about .team__cell--c {
  background: var(--warm);
  color: var(--indigo);
  border: 1px solid var(--about-line-brass);
}

.page-about .team__num {
  font-size: clamp(1.5rem, 4vw, 2rem);
  font-weight: 800;
  line-height: 1;
}

.page-about .team__cell--c .team__num {
  color: var(--red);
}

.page-about .team__label {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.page-about .team__note {
  font-size: 11.5px;
  line-height: 1.5;
  opacity: 0.78;
}

/* ---------- 版本时间线 ---------- */
.page-about .vers {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about .vers__item {
  position: relative;
  display: grid;
  grid-template-columns: 22px minmax(0, 1fr);
  gap: 12px;
  padding-bottom: 20px;
}

.page-about .vers__item::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 16px;
  bottom: 0;
  width: 1px;
  background: linear-gradient(180deg, var(--about-line-brass), rgba(201, 214, 216, 0.3));
}

.page-about .vers__item:last-child::before {
  display: none;
}

.page-about .vers__dot {
  width: 11px;
  height: 11px;
  margin-top: 5px;
  border-radius: 50%;
  background: var(--brass);
  box-shadow: 0 0 0 4px rgba(200, 150, 62, 0.16);
}

.page-about .vers__dot--hot {
  background: var(--red);
  box-shadow: 0 0 0 4px rgba(230, 57, 70, 0.14);
}

.page-about .vers__body {
  background: #FFFFFF;
  border: 1px solid var(--about-line);
  border-radius: var(--radius-organic);
  padding: 14px 16px;
  transition: transform 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
}

.page-about .vers__item:hover .vers__body {
  transform: translateY(-2px);
  border-color: var(--about-line-brass);
  box-shadow: 0 12px 26px rgba(18, 38, 58, 0.09);
}

.page-about .vers__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 12px;
  margin: 0 0 8px;
}

.page-about .vers__year {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: #FFFFFF;
  background: var(--indigo);
  padding: 2px 8px;
  border-radius: 3px;
}

.page-about .vers__name {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1rem, 2.2vw, 1.14rem);
  color: var(--indigo);
}

.page-about .vers__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: #3E4B55;
}

/* ---------- 内容目录 ---------- */
.page-about .catalog {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  border-top: 1px solid var(--about-line-brass);
}

.page-about .catalog__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 4px 14px;
  align-items: baseline;
  padding: 13px 2px;
  border-bottom: 1px solid var(--about-line);
}

.page-about .catalog__k {
  font-size: 14px;
  font-weight: 700;
  color: var(--indigo);
}

.page-about .catalog__v {
  font-size: clamp(1.1rem, 2.6vw, 1.35rem);
  font-weight: 800;
  color: var(--red);
  text-align: right;
}

.page-about .catalog__d {
  grid-column: 1 / -1;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--grey);
}

/* ---------- 深色分区 ---------- */
.page-about .about-sec--dark {
  background: var(--indigo);
  border-radius: var(--radius-organic);
  padding: clamp(22px, 4vw, 38px) clamp(16px, 3vw, 32px);
  border-top: 0;
  margin-block: clamp(10px, 2vw, 20px);
  color: var(--mist);
}

.page-about .about-sec--dark .about-sec__num {
  -webkit-text-stroke: 1px rgba(47, 212, 194, 0.7);
}

.page-about .about-sec--dark .about-sec__title {
  color: #FFFFFF;
}

.page-about .about-sec--dark .about-sec .prose,
.page-about .about-sec--dark .prose {
  color: rgba(244, 247, 248, 0.84);
}

.page-about .about-sec--dark .side-card {
  background: rgba(255, 249, 240, 0.94);
}

.page-about .cover {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
  margin-top: 22px;
}

.page-about .cover__item {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 12px 14px;
  background: rgba(11, 22, 32, 0.42);
  border: 1px solid rgba(201, 214, 216, 0.16);
  border-radius: var(--radius-organic);
}

.page-about .cover__num {
  font-size: clamp(1.15rem, 3vw, 1.5rem);
  font-weight: 800;
  color: var(--aqua);
  white-space: nowrap;
}

.page-about .cover__label {
  font-size: 13px;
  color: var(--silver);
}

/* ---------- 承诺 ---------- */
.page-about .promise {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .promise__item {
  display: grid;
  grid-template-columns: 54px minmax(0, 1fr);
  gap: 12px;
  align-items: start;
  padding: 12px 0;
  border-top: 1px solid var(--about-line);
}

.page-about .promise__k {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--brass);
  padding-top: 3px;
}

.page-about .promise__v {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: #3E4B55;
}

/* ---------- 结尾 ---------- */
.page-about .about-cta {
  margin-top: clamp(20px, 3vw, 36px);
  padding: clamp(26px, 4vw, 42px) clamp(18px, 3vw, 34px);
  background:
    linear-gradient(120deg, var(--warm) 0%, #FFFFFF 60%, rgba(46, 111, 142, 0.1) 100%);
  border: 1px solid var(--about-line-brass);
  border-radius: var(--radius-organic);
}

.page-about .about-cta__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.25rem, 3.2vw, 1.8rem);
  color: var(--indigo);
  margin: 0 0 10px;
}

.page-about .about-cta__text {
  margin: 0 0 20px;
  font-size: 14.5px;
  line-height: 1.8;
  color: #4A5862;
}

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

.page-about .about-cta .btn {
  font-size: 14px;
}

/* ---------- 断点 ---------- */
@media (min-width: 560px) {
  .page-about .cover {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .cover__item {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: 46fr 54fr;
    gap: clamp(32px, 5vw, 64px);
  }

  .page-about .about-hero__visual {
    padding: clamp(18px, 3vw, 34px);
  }

  .page-about .about-sec {
    grid-template-columns: minmax(0, 1fr) var(--about-side-w);
    gap: clamp(22px, 3vw, 40px);
    align-items: start;
  }

  .page-about .about-sec__side {
    position: sticky;
    top: calc(var(--topbar-h) + 28px);
  }

  .page-about .catalog__row {
    grid-template-columns: minmax(0, 1fr) 96px minmax(0, 1.4fr);
    align-items: center;
  }

  .page-about .catalog__d {
    grid-column: auto;
    text-align: right;
  }
}

@media (min-width: 1024px) {
  .page-about .about-body {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: clamp(28px, 3.4vw, 52px);
    align-items: start;
  }

  .page-about .about-index {
    position: sticky;
    top: calc(var(--topbar-h) + 28px);
    border-left: 1px solid var(--about-line-brass);
    padding-left: 16px;
  }

  .page-about .about-index__list {
    flex-direction: column;
    overflow: visible;
    gap: 2px;
  }

  .page-about .about-index__link {
    display: flex;
    width: 100%;
    border: 0;
    border-radius: 0;
    background: transparent;
    padding: 7px 0;
    color: #5A6771;
    border-bottom: 1px solid transparent;
  }

  .page-about .about-index__link:hover,
  .page-about .about-index__link:focus-visible {
    background: transparent;
    color: var(--indigo);
    border-bottom-color: var(--about-line-brass);
  }

  .page-about .about-index__link.is-current {
    background: transparent;
    color: var(--indigo);
    font-weight: 700;
    border-bottom-color: var(--brass);
  }

  .page-about .about-index__link.is-current .about-index__num {
    color: var(--red);
  }
}
<<<END>>>