.page-about {
  --ab-line: rgba(201, 207, 201, .14);
  --ab-line-strong: rgba(201, 207, 201, .30);
  --ab-ink-text: #24302C;
  display: block;
  background: var(--ink-950);
  color: var(--concrete-200);
  padding-bottom: clamp(56px, 8vw, 120px);
  overflow-x: clip;
}

.page-about .about-shell {
  padding-top: clamp(104px, 13vw, 150px);
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--concrete-500);
  margin: 0 0 clamp(28px, 4vw, 52px);
}
.page-about .about-crumbs a {
  color: var(--concrete-500);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .2s var(--ease), border-color .2s var(--ease);
}
.page-about .about-crumbs a:hover,
.page-about .about-crumbs a:focus-visible {
  color: var(--neon-400);
  border-bottom-color: var(--neon-400);
}
.page-about .about-crumbs [aria-current="page"] {
  color: var(--concrete-200);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(30px, 4vw, 52px);
  align-items: end;
  padding-bottom: clamp(40px, 5vw, 72px);
  border-bottom: 1px solid var(--ab-line);
}

.page-about .about-hero__kicker {
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: .22em;
  color: var(--neon-400);
  margin: 0 0 clamp(18px, 2.4vw, 28px);
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(34px, 6vw, 82px);
  line-height: 1.04;
  letter-spacing: -.02em;
  color: var(--paint-050);
  margin: 0 0 clamp(20px, 2.6vw, 32px);
}
.page-about .about-hero__title em {
  position: relative;
  font-style: normal;
  color: var(--signal-500);
}
.page-about .about-hero__title em::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: .03em;
  height: .07em;
  background: var(--neon-400);
  opacity: .55;
}

.page-about .about-hero__lead {
  font-size: clamp(16px, 1.3vw, 18px);
  line-height: 1.9;
  color: var(--concrete-200);
  max-width: 36em;
  margin: 0 0 clamp(24px, 3vw, 36px);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.page-about .about-hero__figure {
  position: relative;
  margin: 0;
  overflow: hidden;
  aspect-ratio: 4 / 5;
  background: var(--concrete-900);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 44px), calc(100% - 44px) 100%, 0 100%);
}
.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
  filter: saturate(.8) contrast(1.06) brightness(.85);
}
.page-about .about-hero__figure::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(7, 22, 19, .04) 38%, rgba(7, 22, 19, .8) 100%);
  pointer-events: none;
}
.page-about .about-hero__figure::before {
  content: "";
  position: absolute;
  left: 0;
  top: 14%;
  bottom: 14%;
  width: 3px;
  background: linear-gradient(180deg, var(--neon-400), rgba(47, 232, 198, 0));
  z-index: 2;
  pointer-events: none;
}

@media (min-width: 900px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
  }
}

/* ---------- 双栏骨架 ---------- */
.page-about .about-body {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(36px, 5vw, 64px);
  margin-top: clamp(48px, 6vw, 88px);
}

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

@media (min-width: 1080px) {
  .page-about .about-body {
    grid-template-columns: minmax(0, 3fr) minmax(0, 9fr);
    gap: clamp(32px, 3vw, 56px);
  }
  .page-about .about-rail {
    display: block;
    align-self: start;
    position: sticky;
    top: clamp(100px, 10vw, 132px);
    padding-right: 8px;
  }
}

.page-about .about-rail__inner {
  position: relative;
  padding-left: 4px;
}

.page-about .about-rail__annot {
  writing-mode: vertical-rl;
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: .28em;
  color: var(--concrete-500);
  margin: 0 0 22px;
  text-transform: uppercase;
}

.page-about .about-rail__scale {
  list-style: none;
  margin: 0;
  padding: 0 0 0 20px;
  border-left: 1px solid var(--ab-line-strong);
  display: flex;
  flex-direction: column;
  gap: clamp(24px, 2.6vw, 34px);
}

.page-about .about-rail__tick {
  position: relative;
  display: block;
  font-family: var(--font-data);
  font-size: 12.5px;
  letter-spacing: .12em;
  color: var(--concrete-500);
  text-decoration: none;
  transition: color .22s var(--ease);
}
.page-about .about-rail__tick::before {
  content: "";
  position: absolute;
  left: -25px;
  top: 50%;
  margin-top: -4px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--ink-950);
  border: 1px solid var(--ab-line-strong);
  transition: background .22s var(--ease), border-color .22s var(--ease), box-shadow .22s var(--ease);
}
.page-about .about-rail__tick:hover,
.page-about .about-rail__tick:focus-visible {
  color: var(--neon-400);
}
.page-about .about-rail__tick:hover::before,
.page-about .about-rail__tick:focus-visible::before {
  background: var(--signal-500);
  border-color: var(--signal-500);
  box-shadow: 0 0 0 4px var(--glow-orange);
}

/* ---------- 叙事流 ---------- */
.page-about .about-flow {
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: clamp(52px, 6vw, 92px);
}

.page-about .about-chapter {
  min-width: 0;
  scroll-margin-top: 120px;
}

.page-about .about-chapter__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--ab-line);
  margin-bottom: clamp(22px, 2.6vw, 34px);
}
.page-about .about-chapter__num {
  flex: none;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--signal-500);
}
.page-about .about-chapter__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(23px, 2.9vw, 38px);
  line-height: 1.16;
  letter-spacing: -.015em;
  color: var(--paint-050);
}

.page-about .about-text p {
  font-size: 17px;
  line-height: 1.85;
  color: var(--concrete-200);
  max-width: 34em;
  margin: 0 0 1.1em;
}
.page-about .about-text p:last-child {
  margin-bottom: 0;
}

/* ---------- 团队面板 ---------- */
.page-about .about-panels {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-top: clamp(24px, 3vw, 36px);
}
@media (min-width: 640px) {
  .page-about .about-panels {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.page-about .about-panel {
  position: relative;
  padding: clamp(20px, 2.4vw, 28px);
  background: var(--concrete-900);
  border: 1px solid var(--ab-line);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 26px), calc(100% - 26px) 100%, 0 100%);
  transition: border-color .24s var(--ease), transform .24s var(--ease);
}
.page-about .about-panel:hover {
  border-color: rgba(47, 232, 198, .42);
  transform: translateY(-2px);
}
.page-about .about-panel__title {
  margin: 0 0 16px;
  font-family: var(--font-data);
  font-weight: 500;
  font-size: 13px;
  letter-spacing: .16em;
  color: var(--neon-400);
}
.page-about .about-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.page-about .about-list li {
  position: relative;
  padding-left: 18px;
  font-size: 15.5px;
  line-height: 1.75;
  color: var(--concrete-200);
}
.page-about .about-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .78em;
  width: 8px;
  height: 1px;
  background: var(--signal-500);
}

/* ---------- 版本演进 ---------- */
.page-about .about-era {
  position: relative;
  margin-top: clamp(24px, 3vw, 36px);
  padding: clamp(26px, 3.4vw, 44px) clamp(20px, 2.8vw, 40px);
  background: var(--concrete-900);
  overflow: hidden;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 38px), calc(100% - 38px) 100%, 0 100%);
}
.page-about .about-era__bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
  opacity: .16;
  filter: grayscale(1) contrast(1.12);
  pointer-events: none;
}
.page-about .about-era__scale {
  position: relative;
  z-index: 1;
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}
@media (min-width: 760px) {
  .page-about .about-era__scale {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 20px;
  }
}

.page-about .about-era__item {
  position: relative;
  scroll-margin-top: 130px;
  padding-top: 20px;
  border-top: 2px solid rgba(201, 207, 201, .18);
  transition: border-color .24s var(--ease);
}
.page-about .about-era__item::before {
  content: "";
  position: absolute;
  top: -5px;
  left: 0;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--channel-800);
  border: 1px solid var(--ab-line-strong);
  transition: background .24s var(--ease), border-color .24s var(--ease), box-shadow .24s var(--ease);
}
.page-about .about-era__item:hover {
  border-top-color: var(--signal-500);
}
.page-about .about-era__item:hover::before {
  background: var(--signal-500);
  border-color: var(--signal-500);
}
.page-about .about-era__item.is-current {
  border-top-color: var(--signal-500);
}
.page-about .about-era__item.is-current::before {
  background: var(--signal-500);
  border-color: var(--signal-500);
  box-shadow: 0 0 0 5px var(--glow-orange);
}

.page-about .about-era__yr {
  display: block;
  font-family: var(--font-data);
  font-size: clamp(20px, 2.2vw, 24px);
  font-weight: 700;
  letter-spacing: .04em;
  line-height: 1;
  color: var(--paint-050);
  margin-bottom: 10px;
}
.page-about .about-era__name {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--neon-400);
}
.page-about .about-era__desc {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--concrete-200);
}

/* ---------- 数字带 ---------- */
.page-about .about-band {
  position: relative;
  width: 100%;
  padding: clamp(24px, 3vw, 34px) 0;
  border-top: 1px solid var(--ab-line-strong);
  border-bottom: 1px solid var(--ab-line-strong);
}
.page-about .about-band::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: min(240px, 42%);
  height: 2px;
  background: linear-gradient(90deg, var(--signal-500), var(--neon-400));
}

.page-about .about-band__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(18px, 2.4vw, 28px);
}
@media (min-width: 900px) {
  .page-about .about-band__list {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }
  .page-about .about-band--with-figure .about-band__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .about-band__cell {
  min-width: 0;
}
.page-about .about-band__num {
  display: block;
  font-family: var(--font-data);
  font-size: clamp(24px, 2.8vw, 36px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.01em;
  color: var(--signal-500);
  margin-bottom: 8px;
}
.page-about .about-band__label {
  display: block;
  font-size: 13.5px;
  line-height: 1.6;
  letter-spacing: .02em;
  color: var(--concrete-500);
}

.page-about .about-band__figure {
  margin: 0 0 22px;
  width: 96px;
  height: 96px;
  overflow: hidden;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 16px), calc(100% - 16px) 100%, 0 100%);
}
.page-about .about-band__figure img {
  display: block;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
  filter: saturate(.7) contrast(1.06) brightness(.9);
}
@media (min-width: 900px) {
  .page-about .about-band--with-figure {
    display: flex;
    align-items: center;
    gap: clamp(24px, 3vw, 44px);
  }
  .page-about .about-band--with-figure .about-band__list {
    flex: 1 1 auto;
    min-width: 0;
  }
  .page-about .about-band__figure {
    flex: none;
    margin: 0;
    width: 150px;
    height: 150px;
  }
}

/* ---------- 数据流程 ---------- */
.page-about .about-steps {
  list-style: none;
  margin: clamp(24px, 3vw, 36px) 0 0;
  padding: 1px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--ab-line);
  border: 1px solid var(--ab-line);
}
@media (min-width: 720px) {
  .page-about .about-steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}
@media (min-width: 1120px) {
  .page-about .about-steps {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}
.page-about .about-steps__item {
  min-width: 0;
  background: var(--ink-950);
  padding: clamp(18px, 2.2vw, 26px);
  transition: background .24s var(--ease);
}
.page-about .about-steps__item:hover {
  background: rgba(18, 53, 42, .6);
}
.page-about .about-steps__idx {
  display: block;
  font-family: var(--font-data);
  font-size: 11.5px;
  letter-spacing: .2em;
  color: var(--neon-400);
  margin-bottom: 14px;
}
.page-about .about-steps__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  color: var(--paint-050);
}
.page-about .about-steps__desc {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--concrete-200);
}

/* ---------- 合作与荣誉 ---------- */
.page-about .about-tags {
  list-style: none;
  margin: clamp(22px, 2.6vw, 32px) 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.page-about .about-tags li {
  font-family: var(--font-data);
  font-size: 13px;
  letter-spacing: .06em;
  padding: 8px 16px;
  color: var(--concrete-200);
  background: rgba(18, 53, 42, .42);
  border: 1px solid var(--ab-line-strong);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%);
  transition: color .22s var(--ease), border-color .22s var(--ease), background .22s var(--ease), transform .22s var(--ease);
}
.page-about .about-tags li:hover {
  color: var(--neon-400);
  border-color: var(--neon-400);
  background: rgba(47, 232, 198, .08);
  transform: translateY(-2px);
}

.page-about .about-honor {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-top: clamp(22px, 2.6vw, 30px);
}
@media (min-width: 640px) {
  .page-about .about-honor {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}
.page-about .about-honor__card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: clamp(18px, 2.2vw, 24px);
  background: var(--concrete-900);
  border-left: 3px solid var(--signal-500);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 22px), calc(100% - 22px) 100%, 0 100%);
}
.page-about .about-honor__year {
  font-family: var(--font-data);
  font-size: 13px;
  letter-spacing: .18em;
  color: var(--amber-400);
}
.page-about .about-honor__name {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  color: var(--paint-050);
}
.page-about .about-honor__note {
  font-size: 13.5px;
  color: var(--concrete-500);
}

.page-about .about-aside-link {
  margin: clamp(20px, 2.4vw, 28px) 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--concrete-500);
}
.page-about .about-aside-link a {
  color: var(--neon-400);
  text-decoration: none;
  border-bottom: 1px solid rgba(47, 232, 198, .4);
  transition: border-color .2s var(--ease), color .2s var(--ease);
}
.page-about .about-aside-link a:hover,
.page-about .about-aside-link a:focus-visible {
  color: var(--signal-500);
  border-bottom-color: var(--signal-500);
}

/* ---------- 浅色呼吸区 ---------- */
.page-about .about-chapter--light {
  scroll-margin-top: 120px;
  padding: clamp(28px, 3.4vw, 52px) clamp(22px, 3vw, 44px);
  background: var(--paint-050);
  color: var(--ink-950);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 34px), calc(100% - 34px) 100%, 0 100%);
}
.page-about .about-chapter--light .about-chapter__head {
  border-bottom-color: rgba(7, 22, 19, .2);
}
.page-about .about-chapter--light .about-chapter__num {
  color: var(--signal-600);
}
.page-about .about-chapter--light .about-chapter__title {
  color: var(--ink-950);
}
.page-about .about-chapter--light .about-text p {
  color: var(--ab-ink-text);
}

.page-about .about-contact {
  margin: clamp(24px, 3vw, 34px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  border-top: 1px solid rgba(7, 22, 19, .16);
}
@media (min-width: 720px) {
  .page-about .about-contact {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: clamp(24px, 3vw, 48px);
  }
}
.page-about .about-contact__row {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 0;
  border-bottom: 1px solid rgba(7, 22, 19, .12);
}
.page-about .about-contact__key {
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: .16em;
  color: #5C6660;
}
.page-about .about-contact__val {
  margin: 0;
  font-size: 16px;
  line-height: 1.6;
  font-weight: 500;
  color: var(--ink-950);
  word-break: break-word;
}

/* ---------- 延伸入口 ---------- */
.page-about .about-next {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin-top: clamp(26px, 3vw, 38px);
  background: var(--ab-line);
  border: 1px solid var(--ab-line);
}
@media (min-width: 720px) {
  .page-about .about-next {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}
@media (min-width: 1120px) {
  .page-about .about-next {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}
.page-about .about-next__item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 18px 20px;
  background: var(--ink-950);
  color: var(--concrete-200);
  text-decoration: none;
  font-size: 15px;
  letter-spacing: .02em;
  transition: background .24s var(--ease), color .24s var(--ease);
}
.page-about .about-next__item:hover,
.page-about .about-next__item:focus-visible {
  background: var(--channel-800);
  color: var(--paint-050);
}
.page-about .about-next__arrow {
  font-family: var(--font-data);
  color: var(--signal-500);
  transition: transform .24s var(--ease);
}
.page-about .about-next__item:hover .about-next__arrow,
.page-about .about-next__item:focus-visible .about-next__arrow {
  transform: translateX(4px);
}

/* ---------- 焦点可见 ---------- */
.page-about a:focus-visible,
.page-about button:focus-visible {
  outline: 2px solid var(--neon-400);
  outline-offset: 3px;
}