.page-about {
  display: block;
}

.page-about .about-hero {
  position: relative;
  display: flex;
  align-items: flex-end;
  min-height: clamp(500px, 70vh, 760px);
  overflow: hidden;
  border-bottom: 1px solid var(--sj-line);
}

.page-about .about-hero__media {
  position: absolute;
  inset: 0;
  z-index: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 42%;
  opacity: .48;
}

.page-about .about-hero__veil {
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background:
    linear-gradient(180deg, rgba(5, 7, 12, .34) 0%, rgba(5, 7, 12, .78) 56%, var(--sj-ink) 100%),
    linear-gradient(104deg, rgba(15, 46, 44, .88) 0%, rgba(27, 18, 51, .52) 54%, rgba(42, 15, 28, .76) 100%);
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 2;
  width: 100%;
  padding-top: clamp(120px, 18vh, 190px);
  padding-bottom: clamp(36px, 6vh, 68px);
}

.page-about .about-hero__inner .sj-breadcrumb {
  margin-bottom: clamp(18px, 2.6vw, 30px);
}

.page-about .about-hero__inner h1 {
  margin: 10px 0 0;
  max-width: 20ch;
}

.page-about .about-hero__inner .sj-lede {
  margin-top: 16px;
  max-width: 56ch;
}

.page-about .about-hero__marks {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 34px;
  margin: clamp(24px, 3.4vw, 38px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-hero__marks li {
  display: flex;
  align-items: baseline;
  gap: 8px;
  font-size: 15px;
  color: var(--sj-muted);
}

.page-about .about-hero__marks .sj-mono {
  font-size: 24px;
  font-weight: 700;
  letter-spacing: -.02em;
  color: var(--sj-spring);
}

.page-about .about-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  padding-block: clamp(40px, 6vw, 76px) clamp(56px, 8vw, 110px);
}

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

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

.page-about .about-index__cap {
  margin: 0 0 12px;
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--sj-muted);
}

.page-about .about-index__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.page-about .about-index__link {
  display: block;
  padding: 9px 12px;
  font-size: 14px;
  line-height: 1.4;
  color: var(--sj-muted);
  text-decoration: none;
  border-left: 2px solid var(--sj-line);
  transition: color .2s ease, border-color .2s ease, background-color .2s ease;
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  color: var(--sj-text);
  border-left-color: var(--sj-summer);
  background-color: rgba(53, 214, 255, .07);
}

.page-about .about-head {
  max-width: 720px;
  margin-bottom: clamp(24px, 3.2vw, 42px);
}

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

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

.page-about .about-head .sj-lede {
  margin: 14px 0 0;
}

.page-about .about-section + .about-section {
  margin-top: clamp(52px, 7vw, 96px);
  padding-top: clamp(44px, 6vw, 82px);
  border-top: 1px solid var(--sj-line);
}

/* ---------- 竖向时间线 ---------- */

.page-about .about-timeline {
  position: relative;
  padding-left: 36px;
}

.page-about .about-timeline__rail {
  position: absolute;
  left: 10px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  border-radius: 2px;
  opacity: .62;
  background: linear-gradient(180deg,
      var(--sj-spring) 0%,
      var(--sj-summer) 32%,
      var(--sj-autumn) 64%,
      var(--sj-winter) 100%);
}

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

.page-about .about-node {
  position: relative;
  padding-bottom: clamp(26px, 3.4vw, 40px);
}

.page-about .about-node:last-child {
  padding-bottom: 0;
}

.page-about .about-node__dot {
  position: absolute;
  left: -31px;
  top: 7px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  border: 2px solid var(--sj-spring);
  background: var(--sj-ink);
  box-shadow: 0 0 0 4px rgba(200, 240, 74, .14);
  transition: transform .24s ease;
}

.page-about .about-node:hover .about-node__dot {
  transform: scale(1.18);
}

.page-about .about-node:nth-child(1) .about-node__dot {
  border-color: var(--sj-spring);
  box-shadow: 0 0 0 4px rgba(200, 240, 74, .14);
}

.page-about .about-node:nth-child(2) .about-node__dot {
  border-color: var(--sj-summer);
  box-shadow: 0 0 0 4px rgba(53, 214, 255, .14);
}

.page-about .about-node:nth-child(3) .about-node__dot {
  border-color: var(--sj-autumn);
  box-shadow: 0 0 0 4px rgba(255, 194, 77, .14);
}

.page-about .about-node:nth-child(4) .about-node__dot {
  border-color: var(--sj-spring-2);
  box-shadow: 0 0 0 4px rgba(255, 111, 165, .14);
}

.page-about .about-node:nth-child(5) .about-node__dot {
  border-color: var(--sj-winter);
  box-shadow: 0 0 0 4px rgba(168, 236, 255, .14);
}

.page-about .about-node__season {
  margin: 0 0 6px;
  font-size: 13px;
  letter-spacing: .1em;
}

.page-about .about-node:nth-child(1) .about-node__season { color: var(--sj-spring); }
.page-about .about-node:nth-child(2) .about-node__season { color: var(--sj-summer); }
.page-about .about-node:nth-child(3) .about-node__season { color: var(--sj-autumn); }
.page-about .about-node:nth-child(4) .about-node__season { color: var(--sj-spring-2); }
.page-about .about-node:nth-child(5) .about-node__season { color: var(--sj-winter); }

.page-about .about-node__title {
  margin: 0 0 8px;
  font-size: clamp(19px, 2vw, 24px);
  font-weight: 800;
  letter-spacing: -.01em;
  color: var(--sj-text);
}

.page-about .about-node__text {
  margin: 0;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.65;
  color: rgba(243, 247, 250, .84);
}

.page-about .about-node__more {
  margin: 0;
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.6;
  color: var(--sj-muted);
  transition: max-height .3s ease, opacity .3s ease, margin-top .3s ease;
}

.page-about .about-node:hover .about-node__more,
.page-about .about-node:focus-within .about-node__more {
  max-height: 8rem;
  opacity: 1;
  margin-top: 8px;
}

/* ---------- 功能卡片 ---------- */

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

.page-about .about-duty {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 10px;
  overflow: hidden;
  padding: 24px 22px 26px;
  border: 1px solid var(--sj-line);
  border-radius: 18px 4px 18px 4px;
  background-color: var(--sj-surface);
  transition: transform .24s ease, border-color .24s ease, background-color .24s ease;
}

.page-about .about-duty--a { color: var(--sj-spring); }
.page-about .about-duty--b { color: var(--sj-summer); }
.page-about .about-duty--c { color: var(--sj-autumn); }
.page-about .about-duty--d { color: var(--sj-spring-2); }
.page-about .about-duty--e { color: var(--sj-winter); }

.page-about .about-duty--a { background-color: rgba(15, 46, 44, .72); }
.page-about .about-duty--d { background-color: rgba(42, 15, 28, .72); }
.page-about .about-duty--c { background-color: rgba(27, 18, 51, .72); }

.page-about .about-duty::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 64px;
  height: 3px;
  background-color: currentColor;
}

.page-about .about-duty::after {
  content: "";
  position: absolute;
  right: -52px;
  bottom: -52px;
  width: 132px;
  height: 132px;
  border-radius: 50%;
  background-color: currentColor;
  opacity: .08;
  pointer-events: none;
}

.page-about .about-duty:hover {
  transform: translateY(-2px);
  border-color: currentColor;
}

.page-about .about-duty__num {
  margin: 0;
  font-size: 13px;
  letter-spacing: .18em;
}

.page-about .about-duty__title {
  margin: 0;
  font-size: clamp(20px, 1.7vw, 24px);
  font-weight: 800;
  letter-spacing: -.01em;
  color: var(--sj-text);
}

.page-about .about-duty__text {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.65;
  color: rgba(243, 247, 250, .84);
}

.page-about .about-duty__meta {
  margin: 0;
  font-size: 14px;
  line-height: 1.6;
  color: var(--sj-muted);
}

.page-about .about-duty__link {
  margin-top: auto;
  align-self: flex-start;
  padding-bottom: 2px;
  font-size: 14px;
  font-weight: 700;
  color: currentColor;
  text-decoration: none;
  border-bottom: 1px solid currentColor;
}

.page-about .about-duty__link:hover {
  color: var(--sj-text);
  border-bottom-color: var(--sj-text);
}

/* ---------- 左右错位图文 ---------- */

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

.page-about .about-shot {
  margin: 0;
}

.page-about .about-shot .sj-figure__media {
  position: relative;
  overflow: hidden;
  aspect-ratio: 3 / 2;
  border: 1px solid var(--sj-line);
  border-radius: 4px 20px 4px 20px;
  background-color: var(--sj-surface);
}

.page-about .about-shot .sj-figure__media img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
  display: block;
}

.page-about .about-shot .sj-figure__caption {
  margin-top: 12px;
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--sj-muted);
}

.page-about .about-split__body p {
  margin: 0 0 14px;
  max-width: 58ch;
  font-size: 16.5px;
  line-height: 1.7;
  color: rgba(243, 247, 250, .84);
}

.page-about .about-split__body p:last-of-type {
  margin-bottom: 0;
}

.page-about .about-cta {
  margin-top: 22px;
}

/* ---------- 数字卡 ---------- */

.page-about .about-stats {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin-top: clamp(30px, 4vw, 48px);
}

.page-about .about-stat {
  padding: 22px 20px;
  border: 1px solid var(--sj-line);
  border-left: 3px solid var(--sj-autumn);
  border-radius: 0 14px 14px 0;
  background-color: var(--sj-surface);
}

.page-about .about-stat:nth-child(1) {
  border-left-color: var(--sj-spring);
  background-image: linear-gradient(140deg, rgba(200, 240, 74, .09), transparent 68%);
}

.page-about .about-stat:nth-child(2) {
  border-left-color: var(--sj-summer);
  background-image: linear-gradient(140deg, rgba(53, 214, 255, .09), transparent 68%);
}

.page-about .about-stat:nth-child(3) {
  border-left-color: var(--sj-autumn);
  background-image: linear-gradient(140deg, rgba(255, 194, 77, .09), transparent 68%);
}

.page-about .about-stat__num {
  margin: 0;
  font-size: clamp(38px, 4.2vw, 54px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--sj-text);
}

.page-about .about-stat:nth-child(1) .about-stat__num { color: var(--sj-spring); }
.page-about .about-stat:nth-child(2) .about-stat__num { color: var(--sj-summer); }
.page-about .about-stat:nth-child(3) .about-stat__num { color: var(--sj-autumn); }

.page-about .about-stat__label {
  margin: 12px 0 6px;
  font-size: 16px;
  font-weight: 700;
  color: var(--sj-text);
}

.page-about .about-stat__note {
  margin: 0;
  font-size: 14px;
  line-height: 1.6;
  color: var(--sj-muted);
}

/* ---------- 规范列表 ---------- */

.page-about .about-trust {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--sj-line);
}

.page-about .about-trust__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding: 22px 0;
  border-bottom: 1px solid var(--sj-line);
}

.page-about .about-trust__key {
  margin: 0;
  font-size: 13px;
  letter-spacing: .16em;
  color: var(--sj-summer);
}

.page-about .about-trust__body h3 {
  margin: 0 0 6px;
  font-size: 18px;
  font-weight: 800;
  letter-spacing: -.01em;
  color: var(--sj-text);
}

.page-about .about-trust__body p {
  margin: 0;
  max-width: 62ch;
  font-size: 15.5px;
  line-height: 1.65;
  color: rgba(243, 247, 250, .82);
}

.page-about .about-closer {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  margin-top: clamp(32px, 4.4vw, 54px);
  padding: 26px 24px;
  border: 1px solid var(--sj-line-strong);
  border-radius: 18px 4px 18px 4px;
  background-image: linear-gradient(118deg, rgba(15, 46, 44, .88), rgba(27, 18, 51, .88));
}

.page-about .about-closer p {
  margin: 0;
  max-width: 46ch;
  font-size: 16px;
  line-height: 1.65;
  color: rgba(243, 247, 250, .9);
}

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

@media (prefers-reduced-motion: no-preference) {
  .page-about .about-hero__inner > * {
    animation: about-rise .55s ease both;
  }

  .page-about .about-hero__inner > *:nth-child(2) { animation-delay: .06s; }
  .page-about .about-hero__inner > *:nth-child(3) { animation-delay: .12s; }
  .page-about .about-hero__inner > *:nth-child(4) { animation-delay: .18s; }
  .page-about .about-hero__inner > *:nth-child(5) { animation-delay: .24s; }
}

@keyframes about-rise {
  from {
    opacity: 0;
    transform: translateY(10px);
  }

  to {
    opacity: 1;
    transform: none;
  }
}

/* ---------- 响应式 ---------- */

@media (min-width: 720px) {
  .page-about .about-duties {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }

  .page-about .about-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
  }
}

@media (min-width: 760px) {
  .page-about .about-trust__row {
    grid-template-columns: 110px minmax(0, 1fr);
    gap: 24px;
    align-items: baseline;
  }
}

@media (min-width: 960px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, .95fr) minmax(0, 1.05fr);
    gap: clamp(32px, 4vw, 58px);
    align-items: center;
  }

  .page-about .about-split--flip .about-split__body { order: 1; }
  .page-about .about-split--flip .about-shot { order: 2; }
}

@media (min-width: 1080px) {
  .page-about .about-shell {
    grid-template-columns: 200px minmax(0, 1fr);
    column-gap: clamp(32px, 4vw, 64px);
  }

  .page-about .about-index {
    display: block;
    position: sticky;
    top: 108px;
    align-self: start;
    height: max-content;
  }
}

@media (min-width: 1200px) {
  .page-about .about-duties {
    grid-template-columns: repeat(6, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .about-duty--a { grid-column: span 4; }
  .page-about .about-duty--b { grid-column: span 2; }
  .page-about .about-duty--c { grid-column: span 2; }
  .page-about .about-duty--d { grid-column: span 4; }
  .page-about .about-duty--e { grid-column: span 6; }
}

@media (max-width: 640px) {
  .page-about .about-hero__inner h1 {
    font-size: clamp(32px, 9vw, 44px);
  }

  .page-about .about-hero__marks .sj-mono {
    font-size: 20px;
  }

  .page-about .about-timeline {
    padding-left: 28px;
  }

  .page-about .about-timeline__rail {
    left: 7px;
  }

  .page-about .about-node__dot {
    left: -25px;
  }
}

@media (hover: none) {
  .page-about .about-node__more {
    max-height: none;
    opacity: 1;
    margin-top: 8px;
  }
}
<<<END>>>