.page-about {
  --about-rail: 38%;
  --about-pad: clamp(24px, 4vw, 56px);
  --about-sec-y: clamp(40px, 5vw, 76px);
  background: var(--ink);
  color: var(--text);
  font-family: var(--font-body);
}

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

/* ---------- 面包屑 ---------- */
.page-about .about-crumb {
  padding-block: 18px 0;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-block: clamp(26px, 4vw, 44px) clamp(40px, 6vw, 76px);
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(120% 90% at 82% -10%, rgba(255, 77, 46, 0.16), transparent 62%),
    radial-gradient(90% 80% at 12% 110%, rgba(39, 211, 162, 0.09), transparent 60%),
    var(--ink);
}

.page-about .about-hero__inner {
  display: flex;
  flex-direction: column;
  gap: clamp(16px, 2vw, 24px);
  max-width: 980px;
}

.page-about .about-hero__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(38px, 6.6vw, 88px);
  line-height: 0.98;
  letter-spacing: -0.02em;
  color: var(--text);
}

.page-about .about-hero__title em {
  font-style: normal;
  color: var(--orange);
}

.page-about .about-hero__lede {
  margin: 0;
  max-width: 62ch;
  color: var(--muted);
  font-size: clamp(16px, 1.5vw, 19px);
  line-height: 1.75;
}

.page-about .about-facts {
  display: flex;
  flex-wrap: wrap;
  gap: clamp(16px, 3vw, 44px);
  margin: clamp(8px, 2vw, 16px) 0 0;
  padding: clamp(18px, 2.5vw, 26px) 0 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.page-about .about-fact {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 96px;
}

.page-about .about-fact__num {
  font-family: var(--font-mono);
  font-size: clamp(22px, 2.6vw, 30px);
  font-weight: 500;
  color: var(--orange);
  line-height: 1;
}

.page-about .about-fact__label {
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--muted);
}

/* ---------- 左右分屏主体 ---------- */
.page-about .about-layout {
  display: grid;
  grid-template-columns: 1fr;
  align-items: start;
}

.page-about .about-rail {
  display: flex;
  flex-direction: column;
  gap: clamp(22px, 3vw, 34px);
  padding: var(--about-pad);
  border-bottom: 1px solid var(--line);
  background-color: var(--teal-deep);
  background-image:
    linear-gradient(180deg, rgba(39, 211, 162, 0.07), transparent 58%),
    repeating-linear-gradient(0deg, transparent 0 47px, rgba(36, 50, 68, 0.4) 47px 48px);
}

.page-about .about-rail__brand {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--line);
}

.page-about .about-rail__mark {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(22px, 2.4vw, 28px);
  letter-spacing: 0.02em;
  color: var(--text);
}

.page-about .about-rail__sub {
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--lg-a);
}

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

.page-about .about-rail__status {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 0;
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
  font-size: 13px;
  color: var(--text);
}

.page-about .about-rail__status-text b {
  color: var(--mint);
  font-weight: 500;
}

.page-about .year-index__title {
  margin: 0 0 10px;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--lg-a);
}

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

.page-about .year-index__list a {
  display: grid;
  grid-template-columns: 62px 1fr;
  gap: 12px;
  align-items: baseline;
  padding: 10px 0;
  border-top: 1px solid var(--line-soft);
  text-decoration: none;
  color: var(--muted);
  font-size: 14px;
  transition: color 200ms var(--ease), padding-left 200ms var(--ease);
}

.page-about .year-index__list a:hover,
.page-about .year-index__list a:focus-visible {
  color: var(--text);
  padding-left: 6px;
}

.page-about .year-index__list b {
  font-size: 15px;
  font-weight: 500;
  color: var(--orange-soft);
}

/* ---------- 右侧连续画布 ---------- */
.page-about .about-canvas {
  display: block;
  min-width: 0;
}

.page-about .about-sec {
  padding: var(--about-sec-y) var(--about-pad);
  border-bottom: 1px solid var(--line);
}

.page-about .about-sec--caps {
  background: var(--ink);
}

.page-about .about-sec--timeline {
  background:
    linear-gradient(180deg, rgba(14, 26, 43, 0.9), var(--ink) 70%);
}

.page-about .about-sec--network {
  background: var(--wine);
}

.page-about .about-sec--service {
  background: var(--panel);
}

.page-about .about-sec--why {
  background: var(--ink);
  border-bottom: 0;
}

.page-about .sec-head {
  display: flex;
  align-items: flex-start;
  gap: clamp(14px, 2.4vw, 26px);
  margin-bottom: clamp(24px, 3vw, 38px);
}

.page-about .sec-num {
  flex: 0 0 auto;
  font-family: var(--font-display);
  font-weight: 200;
  font-size: clamp(56px, 8vw, 108px);
  line-height: 0.78;
  letter-spacing: -0.04em;
  color: rgba(232, 238, 245, 0.1);
  user-select: none;
}

.page-about .sec-head .h2 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(24px, 3vw, 38px);
  line-height: 1.1;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-about .sec-sub {
  margin: 0;
  max-width: 56ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 能力主线 ---------- */
.page-about .caps {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .cap {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
  padding: clamp(20px, 2.6vw, 30px) 0;
  border-bottom: 1px solid var(--line);
  transition: padding-left 200ms var(--ease), background 200ms var(--ease);
}

.page-about .cap:hover,
.page-about .cap:focus-within {
  padding-left: 10px;
  background: linear-gradient(90deg, rgba(255, 77, 46, 0.07), transparent 70%);
}

.page-about .cap__idx {
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--orange);
}

.page-about .cap__body .h3 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(19px, 2.1vw, 25px);
  line-height: 1.25;
  color: var(--text);
}

.page-about .cap__body p {
  margin: 0 0 10px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
  max-width: 62ch;
}

.page-about .cap__body .cap__note {
  margin: 0;
  padding-left: 12px;
  border-left: 1px solid var(--line);
  font-size: 13px;
  color: var(--lg-a);
}

.page-about .cap__body b {
  color: var(--mint);
  font-weight: 500;
}

/* ---------- 图片框 ---------- */
.page-about .about-figure {
  margin: clamp(24px, 3vw, 36px) 0 0;
  position: relative;
  border: 1px solid var(--line);
  overflow: hidden;
  background: var(--ink-deep);
}

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

.page-about .about-figure__caption,
.page-about .about-figure .media-frame__caption {
  padding: 10px 14px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--muted);
  border-top: 1px solid var(--line);
  background: rgba(7, 11, 20, 0.7);
}

/* ---------- 时间轴 ---------- */
.page-about .filter-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: clamp(20px, 2.6vw, 30px);
}

.page-about .filter-count {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--muted);
  margin-left: 6px;
}

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

.page-about .mile {
  position: relative;
  padding: 0 0 clamp(24px, 3vw, 36px) clamp(26px, 3vw, 40px);
  border-left: 1px solid var(--line);
}

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

.page-about .mile::before {
  content: "";
  position: absolute;
  left: -4px;
  top: 14px;
  width: 7px;
  height: 7px;
  background: var(--orange);
  box-shadow: 0 0 0 3px rgba(255, 77, 46, 0.16);
}

.page-about .mile:last-child::before {
  background: var(--mint);
  box-shadow: 0 0 0 3px rgba(39, 211, 162, 0.18);
}

.page-about .mile__year {
  display: block;
  font-family: var(--font-display);
  font-weight: 200;
  font-size: clamp(34px, 5vw, 58px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: rgba(232, 238, 245, 0.34);
  margin-bottom: 8px;
}

.page-about .mile__body .h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(18px, 2vw, 23px);
  line-height: 1.3;
  color: var(--text);
}

.page-about .mile__body p {
  margin: 0;
  max-width: 60ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .mile__chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 14px 0 0;
}

/* ---------- 协作网络 ---------- */
.page-about .network-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 3vw, 40px);
  align-items: start;
}

.page-about .network-copy p {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(232, 238, 245, 0.82);
  max-width: 62ch;
}

.page-about .network-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(18px, 2.4vw, 26px) 0 0;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .network-stat {
  padding: 14px 16px;
  background: rgba(7, 11, 20, 0.38);
}

.page-about .network-stat dt {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: rgba(232, 238, 245, 0.6);
  margin-bottom: 6px;
}

.page-about .network-stat dd {
  margin: 0;
  font-size: clamp(18px, 2vw, 22px);
  color: var(--mint);
}

.page-about .about-sec--network .about-figure {
  margin-top: 0;
  border-color: rgba(255, 122, 92, 0.28);
}

/* ---------- 服务保障 ---------- */
.page-about .service-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 3vw, 40px);
  align-items: start;
}

.page-about .service-topics .h3,
.page-about .service-panel .h3 {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(18px, 2vw, 23px);
  color: var(--text);
}

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

.page-about .topic {
  display: grid;
  grid-template-columns: 34px 1fr;
  gap: 12px;
  align-items: baseline;
  padding: 11px 0;
  border-bottom: 1px solid var(--line-soft);
  font-size: 14px;
  line-height: 1.6;
  color: var(--muted);
}

.page-about .topic__idx {
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--orange-soft);
}

.page-about .service-hint {
  margin: 16px 0 0;
  padding: 12px 14px;
  border-left: 2px solid var(--amber);
  background: rgba(242, 181, 68, 0.07);
  font-size: 13px;
  line-height: 1.75;
  color: rgba(232, 238, 245, 0.8);
}

.page-about .service-panel {
  padding: clamp(20px, 2.6vw, 30px);
  border: 1px solid var(--line);
}

.page-about .service-panel > p {
  margin: 0 0 18px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .service-contact {
  list-style: none;
  margin: 0 0 20px;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .service-contact__row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 12px;
  padding: 12px 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .service-contact__label {
  flex: 0 0 auto;
  min-width: 66px;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.page-about .service-contact__value {
  flex: 1 1 160px;
  font-size: 14px;
  color: var(--text);
  word-break: break-all;
}

.page-about .service-panel .btn {
  width: 100%;
  text-align: center;
}

/* ---------- 为什么选 ---------- */
.page-about .why-list {
  list-style: none;
  margin: 0 0 clamp(28px, 3.6vw, 44px);
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .why {
  padding: clamp(18px, 2.4vw, 26px);
  background: var(--ink);
  transition: background 200ms var(--ease);
}

.page-about .why:hover {
  background: var(--panel);
}

.page-about .why__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(17px, 1.9vw, 21px);
  color: var(--orange-soft);
}

.page-about .why p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .about-next {
  padding-top: clamp(22px, 3vw, 32px);
  border-top: 1px solid var(--line);
}

.page-about .about-next__lead {
  margin: 0 0 16px;
  font-size: 15px;
  color: var(--text);
}

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

/* ---------- 桌面分屏 ---------- */
@media (min-width: 640px) {
  .page-about .network-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

@media (min-width: 900px) {
  .page-about .cap {
    grid-template-columns: 58px 1fr;
    gap: 20px;
  }

  .page-about .network-grid {
    grid-template-columns: 1fr 0.72fr;
  }

  .page-about .service-grid {
    grid-template-columns: 1.15fr 0.85fr;
  }
}

@media (min-width: 1024px) {
  .page-about .about-layout {
    grid-template-columns: var(--about-rail) 1fr;
  }

  .page-about .about-rail {
    position: sticky;
    top: 0;
    max-height: 100vh;
    overflow-y: auto;
    border-bottom: 0;
    border-right: 1px solid var(--line);
  }

  .page-about .about-canvas > .about-sec {
    padding-left: clamp(32px, 4vw, 64px);
    padding-right: clamp(32px, 4vw, 64px);
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .cap,
  .page-about .why,
  .page-about .year-index__list a {
    transition: none;
  }
}
<<<END>>>