.page-about {
  --accent: var(--cyan);
  --about-glow: 0 0 18px rgba(47, 224, 208, .28);
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  padding-top: clamp(18px, 3vw, 30px);
  font-size: 13px;
}

/* ---------- 首屏框景 ---------- */
.page-about .about-hero {
  padding: clamp(16px, 3vw, 28px) 0 clamp(34px, 6vw, 64px);
}

.page-about .about-hero__frame {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  padding: clamp(34px, 6vw, 72px) clamp(22px, 5vw, 64px) clamp(34px, 5vw, 64px);
  background: var(--night);
}

.page-about .about-hero__frame::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(120% 90% at 88% 6%, var(--neon-wash), transparent 62%);
  pointer-events: none;
}

.page-about .about-hero__frame::after {
  content: "";
  position: absolute;
  right: -70px;
  bottom: -90px;
  width: 300px;
  height: 300px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 77, 141, .26), transparent 68%);
  filter: blur(8px);
  pointer-events: none;
}

.page-about .about-hero__corner {
  position: absolute;
  width: 22px;
  height: 22px;
  border: 2px solid var(--cyan);
  opacity: .72;
  pointer-events: none;
}

.page-about .about-hero__corner--tl {
  top: 14px;
  left: 14px;
  border-right: 0;
  border-bottom: 0;
  border-top-left-radius: 10px;
}

.page-about .about-hero__corner--tr {
  top: 14px;
  right: 14px;
  border-left: 0;
  border-bottom: 0;
  border-top-right-radius: 10px;
}

.page-about .about-hero__corner--bl {
  bottom: 14px;
  left: 14px;
  border-right: 0;
  border-top: 0;
  border-bottom-left-radius: 10px;
}

.page-about .about-hero__corner--br {
  bottom: 14px;
  right: 14px;
  border-left: 0;
  border-top: 0;
  border-bottom-right-radius: 10px;
}

.page-about .about-hero .eyebrow {
  position: relative;
  margin: 0;
  font-size: 13px;
  letter-spacing: .18em;
  color: var(--amber);
}

.page-about .about-hero h1 {
  position: relative;
  margin: 16px 0 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(30px, 5.6vw, 62px);
  line-height: 1.12;
  letter-spacing: -.02em;
  color: var(--paper);
  max-width: 22ch;
}

.page-about .about-hero .lede {
  position: relative;
  margin: 20px 0 0;
  max-width: 56ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-hero__facts {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: clamp(26px, 4vw, 44px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-fact {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 122px;
  padding: 14px 20px;
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
  background: rgba(11, 42, 70, .62);
}

.page-about .about-fact__num {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 22px;
  line-height: 1;
  color: var(--amber);
}

.page-about .about-fact__label {
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--mist);
}

/* ---------- 区块基础 ---------- */
.page-about .section {
  padding: clamp(40px, 7vw, 78px) 0;
}

.page-about .chapter__num {
  font-family: var(--font-head);
}

/* ---------- 起源章节 ---------- */
.page-about .about-origin__media {
  margin: clamp(24px, 4vw, 40px) 0 0;
}

.page-about .about-origin__media .media__img {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  aspect-ratio: 16 / 9;
  background: var(--night);
}

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

.page-about .about-origin__grid {
  margin-top: clamp(24px, 4vw, 40px);
  row-gap: 24px;
}

.page-about .about-origin__body p {
  margin: 0 0 1.2em;
  font-size: 16px;
  line-height: 1.85;
  color: var(--paper);
}

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

.page-about .about-origin__aside {
  padding: 22px 22px 20px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--amber);
  border-radius: var(--r-md);
  background: rgba(11, 42, 70, .52);
}

.page-about .about-aside__title {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--amber);
}

.page-about .about-aside__text {
  margin: 0 0 16px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-aside__link {
  display: inline-block;
  font-size: 14px;
  font-weight: 600;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--line-strong);
  padding-bottom: 2px;
}

.page-about .about-aside__link:hover {
  text-shadow: var(--glow-text);
}

/* ---------- 时间带 ---------- */
.page-about .timeline {
  position: relative;
  margin-top: clamp(26px, 4vw, 44px);
  padding-left: 34px;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 11px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--cyan) 0%, var(--amber) 48%, var(--magenta) 100%);
  opacity: .6;
}

.page-about .tl-item {
  position: relative;
  margin-bottom: 14px;
}

.page-about .tl-item:last-child {
  margin-bottom: 0;
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: -29px;
  top: 20px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--amber);
  box-shadow: 0 0 10px rgba(245, 194, 75, .5);
}

.page-about .tl-item__heading {
  margin: 0;
  font-size: inherit;
  font-weight: inherit;
}

.page-about .tl-item__trigger {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 10px 14px;
  width: 100%;
  padding: 14px 18px;
  text-align: left;
  font: inherit;
  color: var(--paper);
  cursor: pointer;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: linear-gradient(140deg, rgba(11, 42, 70, .92), rgba(6, 26, 46, .74));
  transition: transform .18s var(--ease), border-color .18s var(--ease), box-shadow .18s var(--ease);
}

.page-about .tl-item__trigger:hover,
.page-about .tl-item__trigger:focus-visible {
  transform: translateY(-3px);
  border-color: var(--line-strong);
  box-shadow: var(--about-glow);
}

.page-about .tl-item__num {
  font-family: var(--font-head);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .08em;
  color: var(--cyan);
  white-space: nowrap;
}

.page-about .tl-item__title {
  font-family: var(--font-head);
  font-size: 16px;
  font-weight: 700;
  letter-spacing: -.01em;
}

.page-about .tl-item__year {
  font-size: 13px;
  color: var(--mist);
  white-space: nowrap;
}

.page-about .tl-item__panel {
  display: block;
  margin: 0 0 0 16px;
  padding: 14px 0 18px 18px;
  border-left: 1px solid var(--line);
}

.page-about .tl-item[data-open="false"] .tl-item__panel {
  display: none;
}

.page-about .tl-item__panel p {
  margin: 0 0 10px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--mist);
  max-width: 62ch;
}

.page-about .tl-item__result {
  margin: 0;
  font-size: 15px;
  font-weight: 600;
  color: var(--amber);
}

/* ---------- 服务线 ---------- */
.page-about .line-grid {
  margin-top: clamp(24px, 4vw, 40px);
  row-gap: 18px;
}

.page-about .line-card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 28px 24px 24px;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: linear-gradient(150deg, rgba(14, 58, 92, .74), rgba(6, 26, 46, .92));
  overflow: hidden;
  transition: transform .18s var(--ease), border-color .18s var(--ease), box-shadow .18s var(--ease);
}

.page-about .line-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 24px;
  right: 24px;
  height: 3px;
  border-radius: 0 0 4px 4px;
  background: linear-gradient(90deg, var(--accent), transparent 88%);
}

.page-about .line-card:nth-child(1) { --accent: var(--cyan); }
.page-about .line-card:nth-child(2) { --accent: var(--amber); }
.page-about .line-card:nth-child(3) { --accent: var(--magenta); }
.page-about .line-card:nth-child(4) { --accent: var(--orange); }

.page-about .line-card:hover,
.page-about .line-card:focus-within {
  transform: translateY(-4px);
  border-color: var(--line-strong);
  box-shadow: var(--about-glow);
}

.page-about .line-card__idx {
  align-self: flex-start;
  padding: 4px 12px;
  border-radius: var(--pill);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .1em;
  color: var(--accent);
  border: 1px solid currentColor;
  background: rgba(47, 224, 208, .06);
}

.page-about .line-card__title {
  margin: 0;
  font-family: var(--font-head);
  font-size: clamp(19px, 2.4vw, 23px);
  font-weight: 800;
  line-height: 1.3;
  letter-spacing: -.01em;
  color: var(--paper);
}

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

.page-about .line-card__who {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--paper);
  opacity: .82;
}

.page-about .line-card__go {
  margin-top: auto;
  padding-top: 12px;
  font-size: 14px;
  font-weight: 600;
  color: var(--cyan);
  text-decoration: none;
}

.page-about .line-card__go::after {
  content: " →";
}

.page-about .line-card__go:hover {
  text-shadow: var(--glow-text);
}

/* ---------- 团队 ---------- */
.page-about .crew-grid {
  margin-top: clamp(24px, 4vw, 40px);
  row-gap: 24px;
}

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

.page-about .about-crew__figure .media__img {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  aspect-ratio: 3 / 4;
  background: var(--night);
}

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

.page-about .about-crew__caption {
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .about-crew__list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.page-about .crew-card {
  padding: 18px 20px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: rgba(11, 42, 70, .5);
  transition: border-color .18s var(--ease), background .18s var(--ease), transform .18s var(--ease);
}

.page-about .crew-card:hover,
.page-about .crew-card:focus-within {
  transform: translateY(-3px);
  border-color: var(--line-strong);
  background: rgba(14, 58, 92, .72);
}

.page-about .crew-card__name {
  margin: 0 0 6px;
  font-family: var(--font-head);
  font-size: 17px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .crew-card__duty {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .crew-card__more {
  max-height: 0;
  margin: 0;
  overflow: hidden;
  opacity: 0;
  font-size: 13px;
  line-height: 1.8;
  color: var(--cyan);
  transition: max-height .28s var(--ease), opacity .28s var(--ease), margin-top .28s var(--ease);
}

.page-about .crew-card:hover .crew-card__more,
.page-about .crew-card:focus-within .crew-card__more {
  max-height: 140px;
  margin-top: 10px;
  opacity: 1;
}

/* ---------- 合作生态 ---------- */
.page-about .about-eco {
  position: relative;
  overflow: hidden;
}

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

.page-about .about-eco__dots {
  position: absolute;
  inset: -20px -10px;
  background-image: radial-gradient(rgba(47, 224, 208, .22) 1px, transparent 1px);
  background-size: 22px 22px;
  -webkit-mask-image: radial-gradient(circle at 72% 36%, #000 0%, transparent 70%);
  mask-image: radial-gradient(circle at 72% 36%, #000 0%, transparent 70%);
  pointer-events: none;
}

.page-about .about-eco__visual {
  position: relative;
  margin: clamp(22px, 3vw, 34px) 0 0;
}

.page-about .about-eco__visual .media__img {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  aspect-ratio: 3 / 2;
  background: var(--night);
}

.page-about .about-eco__visual .media__img img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .82;
}

.page-about .about-eco__visual::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: var(--r-lg);
  background: linear-gradient(180deg, rgba(6, 26, 46, .12) 0%, rgba(6, 26, 46, .78) 100%);
  pointer-events: none;
}

.page-about .about-eco__caption {
  position: absolute;
  left: 22px;
  bottom: 18px;
  right: 22px;
  z-index: 1;
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--paper);
}

.page-about .about-eco__grid {
  position: relative;
  margin-top: clamp(22px, 3vw, 34px);
  row-gap: 22px;
}

.page-about .about-eco__body p {
  margin: 0 0 1.1em;
  font-size: 15px;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-eco__link {
  display: inline-block;
  font-size: 14px;
  font-weight: 600;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--line-strong);
  padding-bottom: 2px;
}

.page-about .about-eco__link:hover {
  text-shadow: var(--glow-text);
}

.page-about .about-eco__tags {
  display: flex;
  flex-wrap: wrap;
  align-content: flex-start;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-eco__tags li {
  padding: 7px 15px;
  border: 1px solid var(--line-strong);
  border-radius: var(--pill);
  font-size: 13px;
  color: var(--cyan);
  background: rgba(47, 224, 208, .08);
}

/* ---------- 为什么常驻 ---------- */
.page-about .why-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-top: clamp(24px, 4vw, 40px);
}

.page-about .why-item {
  position: relative;
  padding: 26px 22px 22px;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: linear-gradient(165deg, rgba(11, 42, 70, .82), rgba(6, 26, 46, .9));
}

.page-about .why-item:nth-child(2) {
  border-color: rgba(245, 194, 75, .3);
}

.page-about .why-item:nth-child(3) {
  border-color: rgba(255, 77, 141, .3);
}

.page-about .why-item:nth-child(4) {
  border-color: rgba(255, 154, 60, .3);
}

.page-about .why-item__num {
  display: block;
  font-family: var(--font-head);
  font-size: clamp(24px, 3.4vw, 32px);
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: -.02em;
  color: var(--amber);
}

.page-about .why-item:nth-child(3) .why-item__num {
  color: var(--magenta);
}

.page-about .why-item:nth-child(4) .why-item__num {
  color: var(--orange);
}

.page-about .why-item__title {
  margin: 10px 0 8px;
  font-family: var(--font-head);
  font-size: 16px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .why-item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.82;
  color: var(--mist);
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  padding: 0 var(--pad) clamp(48px, 8vw, 88px);
}

.page-about .about-cta__inner {
  position: relative;
  overflow: hidden;
  max-width: var(--wrap);
  margin: 0 auto;
  padding: clamp(30px, 5vw, 56px) clamp(22px, 4vw, 52px);
  border: 1px solid var(--line-strong);
  border-radius: var(--r-lg);
  background: var(--night);
  text-align: left;
}

.page-about .about-cta__inner::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(110% 90% at 90% 0%, rgba(255, 77, 141, .2), transparent 62%);
  pointer-events: none;
}

.page-about .about-cta__title {
  position: relative;
  margin: 0;
  font-family: var(--font-head);
  font-size: clamp(24px, 3.6vw, 38px);
  font-weight: 900;
  letter-spacing: -.02em;
  color: var(--paper);
}

.page-about .about-cta__text {
  position: relative;
  margin: 14px 0 0;
  max-width: 52ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--mist);
}

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

.page-about .about-cta__note {
  position: relative;
  margin: 20px 0 0;
  font-size: 13px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-cta__note a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--line-strong);
}

.page-about .about-cta__note a:hover {
  text-shadow: var(--glow-text);
}

/* ---------- 响应式 ---------- */
@media (max-width: 719px) {
  .page-about .timeline {
    padding-left: 26px;
  }

  .page-about .timeline::before {
    left: 8px;
  }

  .page-about .tl-item::before {
    left: -23px;
    width: 10px;
    height: 10px;
  }

  .page-about .tl-item__trigger {
    grid-template-columns: auto 1fr;
  }

  .page-about .tl-item__year {
    grid-column: 2;
    font-size: 12px;
  }

  .page-about .about-cta {
    padding-left: var(--pad);
    padding-right: var(--pad);
  }
}

@media (min-width: 720px) {
  .page-about .why-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .about-hero__facts {
    gap: 16px;
  }
}

@media (min-width: 900px) {
  .page-about .line-card:nth-child(even) {
    margin-top: 30px;
  }

  .page-about .line-grid {
    padding-bottom: 30px;
  }

  .page-about .why-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 16px;
  }

  .page-about .why-item:nth-child(2) {
    transform: translateY(18px);
  }

  .page-about .why-item:nth-child(4) {
    transform: translateY(18px);
  }
}

@media (hover: none) {
  .page-about .crew-card__more {
    max-height: none;
    margin-top: 10px;
    opacity: 1;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about [data-reveal] {
    opacity: 1 !important;
    transform: none !important;
    transition: opacity .08s linear;
  }

  .page-about .line-card,
  .page-about .crew-card,
  .page-about .tl-item__trigger,
  .page-about .why-item {
    transition: none;
  }

  .page-about .line-card:hover,
  .page-about .line-card:focus-within,
  .page-about .crew-card:hover,
  .page-about .crew-card:focus-within,
  .page-about .tl-item__trigger:hover {
    transform: none;
  }
}