.page-about {
  --about-rail: 150px;
  display: block;
  background: var(--ink);
  color: var(--text);
}

/* ================= 首屏 ================= */
.page-about .about-hero {
  position: relative;
  padding: calc(var(--header-h) + 28px) 0 0;
  background:
    radial-gradient(85% 55% at 6% 0%, rgba(255, 138, 31, 0.16), transparent 60%),
    linear-gradient(180deg, #0B1D31 0%, var(--ink) 100%);
  isolation: isolate;
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(
    112deg,
    rgba(37, 73, 110, 0.5) 0 1px,
    transparent 1px 30px
  );
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.9), transparent 76%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.9), transparent 76%);
  pointer-events: none;
  z-index: 0;
}

.page-about .about-hero > .shell {
  position: relative;
  z-index: 1;
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 26px;
  padding: 22px 0 32px;
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-family: var(--font-head);
  font-size: 32px;
  font-weight: 800;
  line-height: 1.22;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-about .about-hero__lead {
  margin: 18px 0 0;
  max-width: 58ch;
  font-size: 16px;
  line-height: 1.8;
  color: #C6DBEC;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .about-hero__facts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--cut)), calc(100% - var(--cut)) 100%, 0 100%);
}

.page-about .about-fact {
  background: var(--panel);
  padding: 16px 12px 18px;
  min-width: 0;
}

.page-about .about-fact__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--accent);
}

.page-about .about-fact__label {
  display: block;
  margin-top: 6px;
  font-size: 12px;
  line-height: 1.5;
  color: var(--muted);
}

.page-about .about-hero__media {
  position: relative;
  margin: 0 0 40px;
  width: 100%;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  background: var(--panel);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 32px), calc(100% - 32px) 100%, 0 100%);
}

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

/* ================= 通用区块 ================= */
.page-about .about-section {
  padding: 56px 0;
}

.page-about .about-section--tint {
  background: linear-gradient(180deg, rgba(16, 38, 61, 0.92) 0%, var(--ink) 94%);
}

.page-about .about-lead {
  margin: 22px 0 0;
  font-family: var(--font-head);
  font-size: 20px;
  font-weight: 700;
  line-height: 1.6;
  color: var(--text);
}

.page-about .about-lead--wide {
  max-width: 62ch;
}

.page-about .about-copy p {
  margin: 16px 0 0;
  font-size: 16px;
  line-height: 1.8;
  color: #B9D2E7;
}

.page-about .about-copy-block {
  margin: 18px 0 0;
  max-width: 68ch;
  font-size: 16px;
  line-height: 1.8;
  color: #B9D2E7;
}

.page-about a {
  color: var(--accent);
}

.page-about .about-aside {
  margin-top: 30px;
  padding: 18px 20px;
  background: rgba(22, 50, 79, 0.55);
}

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

/* ================= 时间线 ================= */
.page-about .timeline {
  list-style: none;
  margin: 32px 0 0;
  padding: 0;
  display: grid;
  gap: 22px;
}

.page-about .timeline__item {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.page-about .timeline__marker {
  display: flex;
  align-items: baseline;
  gap: 10px;
  position: relative;
}

.page-about .about-year {
  font-family: var(--font-mono);
  font-size: 24px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--accent);
}

.page-about .about-ver {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  line-height: 1.4;
  color: var(--muted);
  border: 1px solid var(--line);
  padding: 2px 7px;
}

.page-about .timeline__body {
  padding: 18px 20px;
  background: linear-gradient(180deg, rgba(22, 50, 79, 0.92), rgba(16, 38, 61, 0.92));
  border: 1px solid var(--line);
  border-left: 3px solid rgba(255, 138, 31, 0.55);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--cut)), calc(100% - var(--cut)) 100%, 0 100%);
  transition: border-left-color 0.25s ease, background 0.25s ease;
}

.page-about .timeline__body:hover {
  border-left-color: var(--accent);
  background: linear-gradient(180deg, rgba(27, 60, 92, 0.95), rgba(19, 44, 70, 0.95));
}

.page-about .timeline__title {
  margin: 0;
  font-family: var(--font-head);
  font-size: 18px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--text);
}

.page-about .timeline__text {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: #A9C6DE;
}

/* ================= 团队 ================= */
.page-about .team-bar {
  display: flex;
  gap: 3px;
  height: 48px;
  margin-top: 26px;
}

.page-about .team-bar__seg {
  display: block;
  height: 100%;
  transition: filter 0.25s ease;
}

.page-about .team-bar__seg--data {
  width: 30.8%;
  background: #2B5B86;
}

.page-about .team-bar__seg--content {
  width: 42.3%;
  background: var(--accent);
}

.page-about .team-bar__seg--product {
  width: 26.9%;
  background: #1B3E60;
}

.page-about .team-bar__seg:hover {
  filter: brightness(1.25);
}

.page-about .about-figure {
  margin: 28px 0 0;
  border: 1px solid var(--line);
  overflow: hidden;
  background: var(--panel);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 20px), calc(100% - 20px) 100%, 0 100%);
}

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

.page-about .team-legend {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about .team-legend__item {
  padding: 18px 18px 22px;
  background: rgba(16, 38, 61, 0.82);
  border: 1px solid var(--line);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 12px), calc(100% - 12px) 100%, 0 100%);
}

.page-about .team-legend__head {
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.page-about .team-legend__num {
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 700;
  line-height: 1;
  color: var(--accent);
}

.page-about .team-legend__role {
  font-family: var(--font-head);
  font-size: 15px;
  font-weight: 700;
  color: var(--text);
}

.page-about .team-legend__text {
  margin: 12px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

/* ================= 更新节奏 ================= */
.page-about .pulse-list {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .pulse-item {
  background: var(--ink);
  padding: 22px 20px 24px;
}

.page-about .pulse-item__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--accent);
}

.page-about .pulse-item__text {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-rhythm-note {
  margin-top: 26px;
  padding-left: 16px;
  border-left: 2px solid var(--accent);
}

.page-about .about-rhythm-note p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

/* ================= 合作 ================= */
.page-about .stands-banner {
  position: relative;
  margin: 0 0 34px;
  width: 100%;
  aspect-ratio: 14 / 9;
  overflow: hidden;
  background: var(--panel);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 36px), calc(100% - 36px) 100%, 0 100%);
}

.page-about .stands-banner img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .coop-tags {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .coop-tag {
  display: inline-flex;
  align-items: center;
  padding: 9px 14px;
  border: 1px solid var(--line);
  background: rgba(22, 50, 79, 0.55);
  font-size: 14px;
  line-height: 1.4;
  color: var(--text);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 8px), calc(100% - 8px) 100%, 0 100%);
}

.page-about .coop-tag--key {
  border-color: rgba(255, 138, 31, 0.55);
  background: rgba(255, 138, 31, 0.08);
  color: var(--accent);
}

/* ================= 里程碑 ================= */
.page-about .milestones {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin-top: 32px;
  background: var(--line);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .milestone {
  position: relative;
  background: var(--ink);
  padding: 26px 22px 30px;
  overflow: hidden;
}

.page-about .milestone::after {
  content: "";
  position: absolute;
  right: -34px;
  top: -34px;
  width: 96px;
  height: 96px;
  background: linear-gradient(135deg, transparent 49%, rgba(255, 138, 31, 0.16) 49%);
  pointer-events: none;
}

.page-about .milestone__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 30px;
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: 0.01em;
  color: var(--accent);
}

.page-about .milestone__num small {
  margin-left: 3px;
  font-size: 15px;
  color: var(--text);
}

.page-about .milestone__title {
  margin: 14px 0 0;
  font-family: var(--font-head);
  font-size: 16px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--text);
}

.page-about .milestone__text {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

/* ================= 尾部延伸 ================= */
.page-about .about-extend {
  padding: 56px 0 72px;
  background: linear-gradient(180deg, var(--ink) 0%, #091625 100%);
}

.page-about .about-extend__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-top: 28px;
}

.page-about .about-extend__card {
  display: block;
  padding: 22px 20px 24px;
  border: 1px solid var(--line);
  background: rgba(16, 38, 61, 0.78);
  color: var(--text);
  text-decoration: none;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 16px), calc(100% - 16px) 100%, 0 100%);
  transition: border-color 0.25s ease, background 0.25s ease, transform 0.25s ease;
}

.page-about .about-extend__card:hover,
.page-about .about-extend__card:focus-visible {
  border-color: var(--accent);
  background: rgba(27, 60, 92, 0.9);
  transform: translateY(-2px);
}

.page-about .about-extend__label {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.page-about .about-extend__title {
  display: block;
  margin-top: 10px;
  font-family: var(--font-head);
  font-size: 18px;
  font-weight: 700;
  line-height: 1.45;
  color: var(--accent);
}

.page-about .about-extend__desc {
  display: block;
  margin-top: 8px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

/* ================= 响应式 ================= */
@media (min-width: 700px) {
  .page-about .about-hero__title {
    font-size: 42px;
  }

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

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

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

@media (min-width: 760px) {
  .page-about .timeline {
    gap: 26px;
  }

  .page-about .timeline__item {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: 0;
  }

  .page-about .timeline__marker {
    flex-direction: column;
    align-items: flex-end;
    gap: 8px;
    padding-right: 26px;
    border-right: 2px solid var(--line);
    text-align: right;
  }

  .page-about .timeline__marker::after {
    content: "";
    position: absolute;
    right: -8px;
    top: 6px;
    width: 14px;
    height: 14px;
    background: var(--accent);
    clip-path: polygon(0 0, 100% 0, 100% 68%, 68% 100%, 0 100%);
  }

  .page-about .timeline__body {
    margin-left: 26px;
  }

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

@media (min-width: 900px) {
  .page-about .about-hero {
    padding-top: calc(var(--header-h) + 40px);
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.85fr) minmax(0, 1fr);
    gap: 52px;
    align-items: end;
    padding: 30px 0 46px;
  }

  .page-about .about-hero__media {
    aspect-ratio: auto;
    height: clamp(300px, 32vw, 470px);
    margin-bottom: 56px;
  }

  .page-about .about-section {
    padding: 88px 0;
  }

  .page-about .about-aside {
    margin-top: 6px;
  }

  .page-about .about-figure {
    margin-top: 6px;
  }

  .page-about .stands-banner {
    aspect-ratio: auto;
    height: clamp(260px, 32vw, 440px);
    margin-bottom: 44px;
  }

  .page-about .about-extend {
    padding: 76px 0 96px;
  }
}

@media (min-width: 1080px) {
  .page-about .about-hero__title {
    font-size: 54px;
    line-height: 1.14;
  }

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

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

@media (prefers-reduced-motion: reduce) {
  .page-about .timeline__body,
  .page-about .about-extend__card,
  .page-about .team-bar__seg {
    transition: none;
  }

  .page-about .about-extend__card:hover,
  .page-about .about-extend__card:focus-visible {
    transform: none;
  }
}
<<<END>>>