.page-about {
  background: var(--c-void);
  color: var(--c-mist);
}

.page-about .about-breadcrumb {
  padding-block: 18px 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--c-mist);
}

.page-about .about-breadcrumb a {
  color: var(--c-cyan);
  text-decoration: none;
}

.page-about .about-breadcrumb a:hover,
.page-about .about-breadcrumb a:focus-visible {
  color: var(--c-ember);
}

.page-about .about-breadcrumb .breadcrumb__sep {
  margin-inline: 8px;
  color: var(--c-steel);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  border-bottom: var(--line);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(42, 74, 112, 0.3) 1px, transparent 1px),
    linear-gradient(90deg, rgba(42, 74, 112, 0.3) 1px, transparent 1px);
  background-size: 72px 72px;
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.75), transparent 78%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.75), transparent 78%);
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  padding-block: clamp(24px, 5vw, 56px) clamp(32px, 6vw, 80px);
}

.page-about .about-hero__title {
  margin: 16px 0 0;
  max-width: 15em;
  font-size: clamp(2.3rem, 7.4vw, 5rem);
  line-height: 1.03;
  letter-spacing: -0.04em;
  font-weight: 800;
  color: var(--c-paper);
}

.page-about .about-hero__lead {
  margin: 20px 0 0;
  max-width: 34em;
  font-size: clamp(1rem, 1.4vw, 1.0625rem);
  line-height: 1.85;
  color: var(--c-mist);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 3vw, 28px);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 20px;
  margin-top: clamp(24px, 4vw, 40px);
  padding-top: 20px;
  border-top: 1px solid var(--c-steel);
}

.page-about .about-stat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.4rem, 3vw, 1.9rem);
  letter-spacing: 0.02em;
  color: var(--c-orange);
  line-height: 1.2;
}

.page-about .about-stat__label {
  display: block;
  margin-top: 4px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--c-mist);
}

.page-about .about-hero__media {
  border: 1px solid var(--c-steel);
  align-self: end;
}

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

/* ---------- 主体两栏 ---------- */
.page-about .about-body {
  display: grid;
  gap: clamp(36px, 5vw, 64px);
  padding-block: clamp(40px, 6vw, 80px) clamp(48px, 8vw, 96px);
}

.page-about .about-main {
  display: grid;
  gap: clamp(48px, 7vw, 88px);
  min-width: 0;
}

.page-about .about-chapter {
  scroll-margin-top: 96px;
  min-width: 0;
}

/* ---------- 侧栏 ---------- */
.page-about .about-side {
  display: grid;
  gap: 18px;
  align-content: start;
  min-width: 0;
}

.page-about .about-index {
  border: 1px solid var(--c-steel);
  background: var(--c-panel);
  padding: 16px;
}

.page-about .about-index__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--c-cyan);
}

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

.page-about .about-index__link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 8px 6px 8px 8px;
  border-left: 2px solid transparent;
  font-size: 13px;
  color: var(--c-mist);
  text-decoration: none;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-about .about-index__link span {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--c-steel);
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  color: var(--c-paper);
  border-left-color: var(--c-cyan);
  background: rgba(47, 243, 224, 0.07);
}

.page-about .about-side__note {
  border: 1px solid var(--c-steel);
  padding: 16px;
}

.page-about .about-side__note-title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--c-ember);
}

.page-about .about-side__note-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.page-about .about-side__note-list li {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  padding-bottom: 6px;
  border-bottom: 1px dashed rgba(42, 74, 112, 0.7);
  font-size: 12.5px;
}

.page-about .about-side__note-list li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .about-side__note-list strong {
  font-family: var(--font-mono);
  font-weight: 400;
  letter-spacing: 0.06em;
  color: var(--c-paper);
}

.page-about .about-side__cta {
  justify-content: center;
  text-align: center;
}

/* ---------- 01 起点 ---------- */
.page-about .about-origin {
  display: grid;
  gap: clamp(24px, 4vw, 40px);
  margin-top: clamp(20px, 3vw, 32px);
}

.page-about .about-origin__text {
  display: grid;
  gap: 16px;
}

.page-about .about-origin__text p {
  margin: 0;
  font-size: 15px;
  line-height: 1.9;
  color: var(--c-mist);
}

.page-about .about-origin__facts {
  border-top: 2px solid var(--c-orange);
  padding-top: 14px;
}

.page-about .about-origin__facts .data-list__row {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding-block: 9px;
  border-bottom: 1px solid var(--c-steel);
}

.page-about .about-origin__facts .data-list__row:last-child {
  border-bottom: 0;
}

.page-about .about-origin__facts .data-list__key {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--c-steel);
}

.page-about .about-origin__facts .data-list__val {
  font-size: 14px;
  color: var(--c-paper);
}

/* ---------- 02 原则 ---------- */
.page-about .about-principles {
  display: grid;
  gap: 1px;
  margin-top: clamp(20px, 3vw, 32px);
  background: var(--c-steel);
  border: 1px solid var(--c-steel);
}

.page-about .about-principle {
  display: grid;
  gap: 10px;
  align-content: start;
  padding: clamp(20px, 3vw, 28px);
  background: var(--c-ink);
}

.page-about .about-principle__num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--c-orange);
}

.page-about .about-principle__title {
  margin: 0;
  font-size: 1.1rem;
  letter-spacing: 0.01em;
  color: var(--c-paper);
}

.page-about .about-principle__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--c-mist);
}

/* ---------- 03 时间线 ---------- */
.page-about .about-timeline-grid {
  display: grid;
  gap: clamp(26px, 4vw, 40px);
  margin-top: clamp(20px, 3vw, 32px);
}

.page-about .about-timeline {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0 0 0 28px;
  display: grid;
  gap: 26px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 6px;
  bottom: 6px;
  width: 1px;
  background: linear-gradient(180deg, var(--c-orange), var(--c-cyan) 55%, var(--c-steel));
}

.page-about .about-timeline__item {
  position: relative;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -27px;
  top: 9px;
  width: 11px;
  height: 11px;
  background: var(--c-void);
  border: 1px solid var(--c-cyan);
  transform: rotate(45deg);
}

.page-about .about-timeline__year {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.1rem;
  letter-spacing: 0.06em;
  color: var(--c-orange);
}

.page-about .about-timeline__title {
  margin: 4px 0 6px;
  font-size: 1rem;
  color: var(--c-paper);
}

.page-about .about-timeline__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--c-mist);
}

.page-about .about-timeline__visual {
  display: grid;
  gap: 16px;
  align-content: start;
}

.page-about .about-chart-wrap {
  border: 1px solid var(--c-steel);
  background: var(--c-ink);
  padding: 14px 16px 10px;
}

.page-about .about-chart {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .about-chart__axis {
  stroke: var(--c-steel);
  stroke-width: 1;
}

.page-about .about-chart__line {
  fill: none;
  stroke: var(--c-cyan);
  stroke-width: 2;
  stroke-linejoin: round;
}

.page-about .about-chart__dot {
  fill: var(--c-void);
  stroke: var(--c-orange);
  stroke-width: 2;
}

.page-about .about-chart__label {
  fill: var(--c-mist);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
}

.page-about .about-timeline__media {
  border: 1px solid var(--c-steel);
}

/* ---------- 04 暖白信息岛 ---------- */
.page-about .about-paper {
  display: grid;
  gap: clamp(20px, 3vw, 30px);
  margin-top: clamp(20px, 3vw, 32px);
  padding: clamp(22px, 4vw, 40px);
  background: var(--c-paper);
  border-left: 4px solid var(--c-orange);
  color: var(--c-ink);
}

.page-about .about-paper__body {
  display: grid;
  gap: 14px;
  align-content: start;
}

.page-about .about-paper__title {
  margin: 0;
  font-size: clamp(1.3rem, 2.4vw, 1.85rem);
  line-height: 1.25;
  letter-spacing: -0.02em;
  color: var(--c-ink);
}

.page-about .about-paper__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.9;
  color: rgba(8, 20, 38, 0.8);
}

.page-about .about-paper__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px 16px;
  margin-top: 4px;
}

.page-about .about-paper__stat {
  padding-left: 12px;
  border-left: 2px solid var(--c-orange);
}

.page-about .about-paper__stat b {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.45rem;
  font-weight: 600;
  color: var(--c-ink);
  line-height: 1.2;
}

.page-about .about-paper__stat span {
  display: block;
  margin-top: 3px;
  font-size: 12.5px;
  color: rgba(8, 20, 38, 0.72);
}

.page-about .about-paper__media {
  border: 1px solid rgba(8, 20, 38, 0.22);
  align-self: stretch;
}

/* ---------- 05 场景 ---------- */
.page-about .about-scenarios {
  display: grid;
  gap: 16px;
  margin-top: clamp(20px, 3vw, 32px);
}

.page-about .about-scenario {
  display: grid;
  gap: 10px;
  align-content: start;
  padding: clamp(18px, 3vw, 26px);
  border: 1px solid var(--c-steel);
  border-top: 2px solid var(--c-cyan);
  background: linear-gradient(180deg, rgba(14, 35, 66, 0.9), rgba(8, 20, 38, 0.92));
  transition: border-color 0.25s var(--ease), transform 0.25s var(--ease);
}

.page-about .about-scenario:hover {
  border-color: var(--c-panel-alt);
  transform: translateY(-2px);
}

.page-about .about-scenario .tag {
  justify-self: start;
}

.page-about .about-scenario__title {
  margin: 0;
  font-size: 1.0625rem;
  color: var(--c-paper);
}

.page-about .about-scenario__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--c-mist);
}

.page-about .about-scenario__path {
  margin: 0;
  padding-top: 8px;
  border-top: 1px dashed rgba(42, 74, 112, 0.9);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--c-cyan);
}

/* ---------- 06 下一步 ---------- */
.page-about .about-next {
  display: grid;
  gap: 1px;
  margin-top: clamp(20px, 3vw, 32px);
  background: var(--c-steel);
  border: 1px solid var(--c-steel);
}

.page-about .about-next__card {
  display: grid;
  gap: 8px;
  align-content: space-between;
  min-height: 132px;
  padding: 20px;
  background: var(--c-ink);
  text-decoration: none;
  transition: background 0.22s var(--ease);
}

.page-about .about-next__card > span {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--c-orange);
}

.page-about .about-next__card strong {
  font-size: 1rem;
  color: var(--c-paper);
}

.page-about .about-next__card em {
  font-style: normal;
  font-size: 13px;
  line-height: 1.7;
  color: var(--c-mist);
}

.page-about .about-next__card:hover,
.page-about .about-next__card:focus-visible {
  background: var(--c-panel);
}

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

@media (min-width: 760px) {
  .page-about .about-principles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-paper {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: start;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    align-items: end;
  }

  .page-about .about-origin {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 0.7fr);
  }

  .page-about .about-timeline-grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  }

  .page-about .about-next {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 1024px) {
  .page-about .about-body {
    grid-template-columns: minmax(0, 1fr) 268px;
    column-gap: clamp(32px, 4vw, 64px);
  }

  .page-about .about-side {
    position: sticky;
    top: 88px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-scenario,
  .page-about .about-next__card,
  .page-about .about-index__link {
    transition: none;
  }

  .page-about .about-scenario:hover {
    transform: none;
  }
}
<<<END>>>