.page-about {
  --about-cut: 22px;
  background: var(--ink);
  color: var(--white);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
}

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

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  padding: calc(var(--header-h) + 44px) 0 56px;
  background:
    radial-gradient(110% 82% at 88% -12%, rgba(47, 224, 200, .16), transparent 62%),
    radial-gradient(90% 70% at -5% 108%, rgba(255, 122, 26, .11), transparent 64%),
    linear-gradient(180deg, #08182C 0%, var(--ink) 78%);
  border-bottom: 1px solid var(--line);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(201, 214, 223, .05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(201, 214, 223, .05) 1px, transparent 1px);
  background-size: 64px 64px;
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, .9), transparent 88%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, .9), transparent 88%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -12%;
  top: -35%;
  width: 58%;
  height: 170%;
  background: repeating-linear-gradient(115deg, rgba(47, 224, 200, .09) 0 1px, transparent 1px 24px);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 36px;
  align-items: center;
}

.page-about .about-crumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--muted);
  margin-bottom: 20px;
}

.page-about .about-crumb a {
  color: var(--silver);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.page-about .about-crumb a:hover,
.page-about .about-crumb a:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

.page-about .about-hero h1 {
  font-family: var(--font-head);
  font-size: clamp(32px, 6.2vw, 62px);
  line-height: 1.1;
  letter-spacing: -0.02em;
  font-weight: 800;
  margin: 14px 0 20px;
}

.page-about .about-hero h1 em {
  font-style: normal;
  color: var(--cyan);
}

.page-about .about-hero__lede {
  color: var(--silver);
  font-size: clamp(15px, 1.7vw, 17px);
  max-width: 48ch;
  margin: 0;
}

.page-about .hero-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
}

.page-about .hero-stats li {
  background: rgba(6, 16, 32, .82);
  padding: 14px 16px 16px;
}

.page-about .hero-stats b {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(22px, 3vw, 32px);
  font-weight: 700;
  line-height: 1.1;
  color: var(--cyan);
  letter-spacing: -0.02em;
}

.page-about .hero-stats span {
  display: block;
  margin-top: 4px;
  font-size: 13px;
  color: var(--muted);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

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

.page-about .about-hero__figure .media__frame {
  position: relative;
  background: var(--panel-deep);
  border: 1px solid var(--line-strong);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--about-cut)), calc(100% - var(--about-cut)) 100%, 0 100%);
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(.82) contrast(1.06) brightness(.84);
}

.page-about .about-hero__figure .media__caption {
  display: block;
  margin-top: 12px;
  font-size: 13px;
  color: var(--muted);
  border-left: 2px solid var(--orange);
  padding-left: 10px;
}

/* ---------- 主体骨架 ---------- */

.page-about .about-body {
  display: grid;
  gap: 40px;
  padding-block: 52px 84px;
}

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

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

/* ---------- 章节面板 ---------- */

.page-about .chapter {
  position: relative;
  padding: 30px 22px 36px;
  margin-bottom: 20px;
  background: var(--panel-deep);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--about-cut)), calc(100% - var(--about-cut)) 100%, 0 100%);
  scroll-margin-top: calc(var(--header-h) + 24px);
}

.page-about .chapter--teal {
  background: linear-gradient(165deg, rgba(15, 51, 64, .96) 0%, rgba(12, 30, 51, .88) 58%, rgba(6, 16, 32, .94) 100%);
}

.page-about .chapter--indigo {
  background: linear-gradient(165deg, rgba(27, 16, 53, .96) 0%, rgba(14, 20, 44, .88) 58%, rgba(6, 16, 32, .94) 100%);
}

.page-about .chapter__head {
  margin-bottom: 26px;
}

.page-about .chapter__mark {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--orange);
  margin: 0 0 10px;
}

.page-about .chapter__title {
  font-family: var(--font-head);
  font-size: clamp(23px, 3.4vw, 33px);
  line-height: 1.16;
  letter-spacing: -0.01em;
  font-weight: 800;
  margin: 0 0 12px;
}

.page-about .chapter__lede {
  margin: 0;
  color: var(--silver);
  font-size: 15.5px;
  max-width: 62ch;
}

/* ---------- 人群 ---------- */

.page-about .who-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
}

.page-about .who-item {
  background: rgba(6, 16, 32, .74);
  padding: 20px 18px 22px;
  border-left: 2px solid rgba(47, 224, 200, .34);
}

.page-about .who-item__num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--amber);
  margin: 0 0 8px;
}

.page-about .who-item__title {
  font-family: var(--font-head);
  font-size: 18px;
  font-weight: 700;
  margin: 0 0 8px;
  color: var(--white);
}

.page-about .who-item__text {
  margin: 0;
  color: var(--muted);
  font-size: 14.8px;
}

.page-about .who-summary {
  margin: 22px 0 0;
  padding: 16px 18px;
  background: rgba(47, 224, 200, .07);
  border-left: 3px solid var(--cyan);
  color: var(--silver);
  font-size: 15px;
}

.page-about .who-summary strong {
  color: var(--white);
  font-weight: 700;
}

/* ---------- 覆盖与节奏 ---------- */

.page-about .coverage-stats {
  list-style: none;
  margin: 0 0 30px;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
}

.page-about .coverage-stats li {
  background: rgba(6, 16, 32, .78);
  padding: 16px 16px 18px;
}

.page-about .coverage-stats .num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(26px, 4.2vw, 40px);
  font-weight: 700;
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--cyan);
}

.page-about .coverage-stats .unit {
  font-size: .46em;
  color: var(--muted);
  margin-left: 3px;
  letter-spacing: 0;
}

.page-about .coverage-stats .lbl {
  display: block;
  margin-top: 6px;
  font-size: 13.5px;
  color: var(--muted);
}

.page-about .coverage-split {
  display: grid;
  gap: 26px;
}

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

.page-about .rhythm li {
  display: grid;
  grid-template-columns: 88px minmax(0, 1fr);
  gap: 14px;
  padding: 13px 0;
  border-bottom: 1px dashed var(--line-strong);
  font-size: 14.8px;
  color: var(--silver);
}

.page-about .rhythm .mono {
  font-family: var(--font-mono);
  font-size: 13.5px;
  color: var(--amber);
  letter-spacing: -0.01em;
}

.page-about .coverage-note {
  margin: 20px 0 0;
  color: var(--muted);
  font-size: 14.6px;
}

.page-about .coverage-figure {
  margin: 0;
}

.page-about .coverage-figure .media__frame {
  background: var(--panel-deep);
  border: 1px solid var(--line);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 16px), calc(100% - 16px) 100%, 0 100%);
}

.page-about .coverage-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(.85) contrast(1.08) brightness(.86);
}

.page-about .coverage-figure .media__caption {
  display: block;
  margin-top: 12px;
  font-size: 13px;
  color: var(--muted);
  border-left: 2px solid var(--cyan);
  padding-left: 10px;
}

/* ---------- 能力线标签页 ---------- */

.page-about .cap-tabs .tabs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 24px;
}

.page-about .cap-tabs .tabs__btn {
  font-family: var(--font-head);
  font-size: 14px;
  letter-spacing: .03em;
  padding: 10px 16px;
  background: rgba(6, 16, 32, .6);
  color: var(--muted);
  border: 1px solid var(--line);
  cursor: pointer;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 8px), calc(100% - 8px) 100%, 0 100%);
  transition: color .18s, background-color .18s, border-color .18s;
}

.page-about .cap-tabs .tabs__btn:hover {
  color: var(--white);
  border-color: var(--silver);
}

.page-about .cap-tabs .tabs__btn[aria-selected="true"] {
  background: var(--cyan);
  border-color: var(--cyan);
  color: var(--ink);
  font-weight: 700;
}

.page-about .cap-tabs .tabs__btn:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

.page-about .cap-tabs .tabs__panel {
  display: none;
}

.page-about .cap-tabs .tabs__panel.is-active {
  display: block;
}

.page-about .cap-body {
  display: grid;
  gap: 22px;
  padding: 22px 20px 24px;
  background: rgba(6, 16, 32, .66);
  border-top: 2px solid var(--cyan);
}

.page-about .cap-text p {
  margin: 0 0 14px;
  color: var(--silver);
  font-size: 15px;
  max-width: 64ch;
}

.page-about .cap-text p:last-child {
  margin-bottom: 0;
}

.page-about .cap-facts {
  list-style: none;
  margin: 0;
  padding: 16px 18px;
  background: rgba(15, 51, 64, .5);
  border-left: 2px solid var(--orange);
  display: grid;
  gap: 9px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--white);
  align-content: start;
}

.page-about .cap-facts li {
  padding-left: 14px;
  position: relative;
  line-height: 1.5;
}

.page-about .cap-facts li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .55em;
  width: 6px;
  height: 6px;
  background: var(--cyan);
}

/* ---------- 团队 ---------- */

.page-about .team-bar {
  display: flex;
  height: 40px;
  margin: 0 0 22px;
  border: 1px solid var(--line);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 8px), calc(100% - 8px) 100%, 0 100%);
}

.page-about .team-bar__seg {
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--ink);
  transition: filter .2s ease;
}

.page-about .team-bar__seg:hover {
  filter: brightness(1.16);
}

.page-about .team-bar__seg--ops {
  flex: 12 1 0;
  background: var(--cyan);
}

.page-about .team-bar__seg--dev {
  flex: 9 1 0;
  background: var(--orange);
}

.page-about .team-bar__seg--cs {
  flex: 8 1 0;
  background: var(--amber);
}

.page-about .team-bar__seg--sup {
  flex: 17 1 0;
  background: var(--silver);
}

.page-about .team-legend {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
}

.page-about .team-legend__item {
  display: grid;
  grid-template-columns: 12px 44px minmax(0, 1fr);
  align-items: baseline;
  gap: 10px;
  padding: 14px 16px;
  background: rgba(6, 16, 32, .74);
  font-size: 14.5px;
  color: var(--muted);
}

.page-about .team-legend__item .mono {
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 700;
  line-height: 1.1;
  color: var(--white);
}

.page-about .team-legend__item strong {
  color: var(--white);
  font-weight: 600;
}

.page-about .dot {
  display: block;
  width: 10px;
  height: 10px;
  align-self: center;
}

.page-about .dot--cyan { background: var(--cyan); }
.page-about .dot--orange { background: var(--orange); }
.page-about .dot--amber { background: var(--amber); }
.page-about .dot--silver { background: var(--silver); }

.page-about .team-note {
  margin: 20px 0 0;
  color: var(--muted);
  font-size: 14.6px;
}

.page-about .team-note a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(47, 224, 200, .45);
}

.page-about .team-note a:hover,
.page-about .team-note a:focus-visible {
  border-bottom-color: var(--cyan);
}

/* ---------- 时间轴 ---------- */

.page-about .timeline {
  list-style: none;
  margin: 0;
  padding: 4px 0 4px 30px;
  position: relative;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--amber), var(--cyan) 58%, rgba(201, 214, 223, .18));
}

.page-about .timeline__item {
  position: relative;
  padding-bottom: 28px;
}

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

.page-about .timeline__node {
  position: absolute;
  left: -30px;
  top: 5px;
  width: 16px;
  height: 16px;
  background: var(--ink);
  border: 2px solid var(--amber);
  transform: rotate(45deg);
}

.page-about .timeline__item--now .timeline__node {
  border-color: var(--cyan);
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(47, 224, 200, .18);
}

.page-about .timeline__ver {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--amber);
  margin: 0 0 6px;
}

.page-about .timeline__item--now .timeline__ver {
  color: var(--cyan);
}

.page-about .timeline__title {
  font-family: var(--font-head);
  font-size: 18px;
  font-weight: 700;
  margin: 0 0 8px;
  color: var(--white);
}

.page-about .timeline__text {
  margin: 0;
  color: var(--muted);
  font-size: 14.8px;
  max-width: 66ch;
}

.page-about .timeline-figure {
  margin: 28px 0 0;
}

.page-about .timeline-figure .media__frame {
  background: var(--panel-deep);
  border: 1px solid var(--line);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 16px), calc(100% - 16px) 100%, 0 100%);
}

.page-about .timeline-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(.85) contrast(1.06) brightness(.85);
}

.page-about .timeline-figure .media__caption {
  display: block;
  margin-top: 12px;
  font-size: 13px;
  color: var(--muted);
  border-left: 2px solid var(--amber);
  padding-left: 10px;
}

/* ---------- 合作 ---------- */

.page-about .partner-grid {
  display: grid;
  gap: 1px;
  background: var(--line);
}

.page-about .partner-card {
  background: rgba(6, 16, 32, .74);
  padding: 24px 20px 26px;
}

.page-about .partner-card__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(28px, 4.6vw, 44px);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: var(--orange);
  margin-bottom: 10px;
}

.page-about .partner-card__title {
  font-family: var(--font-head);
  font-size: 18px;
  font-weight: 700;
  margin: 0 0 8px;
  color: var(--white);
}

.page-about .partner-card__text {
  margin: 0;
  color: var(--muted);
  font-size: 14.8px;
}

.page-about .partner-honor {
  margin: 22px 0 0;
  padding: 16px 18px;
  background: rgba(242, 193, 78, .08);
  border-left: 3px solid var(--amber);
  color: var(--silver);
  font-size: 14.8px;
}

.page-about .partner-honor a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(47, 224, 200, .45);
}

.page-about .partner-honor a:hover,
.page-about .partner-honor a:focus-visible {
  border-bottom-color: var(--cyan);
}

/* ---------- 收尾 ---------- */

.page-about .about-cta {
  position: relative;
  margin-top: 6px;
  padding: 34px 24px 36px;
  background: linear-gradient(150deg, rgba(110, 31, 56, .92) 0%, rgba(27, 16, 53, .88) 62%, rgba(6, 16, 32, .95) 100%);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 24px), calc(100% - 24px) 100%, 0 100%);
}

.page-about .about-cta__title {
  font-family: var(--font-head);
  font-size: clamp(22px, 3.2vw, 30px);
  line-height: 1.18;
  letter-spacing: -0.01em;
  font-weight: 800;
  margin: 0 0 12px;
}

.page-about .about-cta__text {
  margin: 0;
  color: var(--silver);
  font-size: 15px;
  max-width: 62ch;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

/* ---------- 响应式 ---------- */

@media (min-width: 600px) {
  .page-about .chapter {
    padding: 36px 32px 42px;
  }

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

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

@media (min-width: 860px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.04fr) minmax(0, .96fr);
    gap: 52px;
  }

  .page-about .about-hero {
    padding: calc(var(--header-h) + 70px) 0 76px;
  }

  .page-about .coverage-split {
    grid-template-columns: minmax(0, 1fr) minmax(0, .8fr);
    gap: 34px;
    align-items: start;
  }

  .page-about .cap-body {
    grid-template-columns: minmax(0, 1fr) 220px;
    gap: 30px;
    padding: 26px 26px 28px;
  }

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

  .page-about .about-cta {
    padding: 42px 40px 44px;
  }
}

@media (min-width: 1024px) {
  .page-about .about-body {
    grid-template-columns: 228px minmax(0, 1fr);
    gap: 58px;
    padding-block: 66px 96px;
  }

  .page-about .about-rail {
    display: block;
    position: sticky;
    top: calc(var(--header-h) + 32px);
    align-self: start;
  }

  .page-about .about-rail .rail__title {
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: .2em;
    text-transform: uppercase;
    color: var(--muted);
    margin: 0 0 14px;
    padding-left: 18px;
  }

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

  .page-about .about-rail .rail__link {
    display: block;
    padding: 10px 12px 10px 18px;
    font-size: 14px;
    color: var(--muted);
    text-decoration: none;
    border-left: 2px solid var(--line);
    transition: color .18s, border-color .18s, background-color .18s;
  }

  .page-about .about-rail .rail__link:hover {
    color: var(--white);
    border-left-color: var(--silver);
    background: rgba(201, 214, 223, .06);
  }

  .page-about .about-rail .rail__link[aria-current="true"] {
    color: var(--cyan);
    border-left-color: var(--cyan);
    background: var(--cyan-dim);
  }

  .page-about .about-rail .rail__link:focus-visible {
    outline: 2px solid var(--cyan);
    outline-offset: 2px;
  }

  .page-about .rhythm li {
    grid-template-columns: 118px minmax(0, 1fr);
  }
}

@media (max-width: 520px) {
  .page-about .team-bar {
    height: 28px;
  }

  .page-about .team-bar__seg {
    font-size: 0;
  }

  .page-about .team-legend__item {
    grid-template-columns: 10px 34px minmax(0, 1fr);
    gap: 8px;
    padding: 13px 14px;
    font-size: 14px;
  }

  .page-about .team-legend__item .mono {
    font-size: 17px;
  }

  .page-about .timeline {
    padding-left: 24px;
  }

  .page-about .timeline__node {
    left: -24px;
    width: 13px;
    height: 13px;
  }

  .page-about .timeline::before {
    left: 6px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .cap-tabs .tabs__btn,
  .page-about .team-bar__seg,
  .page-about .about-rail .rail__link,
  .page-about .about-crumb a {
    transition: none;
  }

  .page-about .team-bar__seg:hover {
    filter: none;
  }
}