.page-about {
  --about-gap: clamp(56px, 9vw, 112px);
  --about-copy: 44ch;
  display: block;
  color: var(--paper);
}

/* ---------- 通用章节头 ---------- */
.page-about .about-sec {
  max-width: 62ch;
  margin: 0 0 clamp(24px, 4vw, 44px);
}

.page-about .about-sec__idx {
  margin: 0 0 10px;
  font-size: 0.76rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--neon);
}

.page-about .about-sec h2 {
  margin: 0 0 12px;
  font-size: clamp(1.55rem, 5.4vw, 2.6rem);
  line-height: 1.22;
  letter-spacing: -0.01em;
}

.page-about .about-sec__lede {
  margin: 0;
  color: var(--mist);
  font-size: 1rem;
  line-height: 1.85;
  max-width: var(--about-copy);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(18px, 4vw, 40px) 0 clamp(40px, 7vw, 82px);
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(120% 92% at 10% 0%, rgba(47, 243, 208, 0.11), transparent 58%),
    radial-gradient(94% 84% at 94% 8%, rgba(255, 138, 43, 0.10), transparent 62%),
    linear-gradient(180deg, var(--night) 0%, var(--arena) 82%);
}

.page-about .about-hero h1 {
  margin: 14px 0 18px;
  max-width: 17ch;
  font-size: clamp(2rem, 8.6vw, 3.9rem);
  line-height: 1.1;
  letter-spacing: -0.02em;
}

.page-about .about-hero__lede {
  margin: 0;
  max-width: 40ch;
  color: var(--mist);
  font-size: clamp(1rem, 2.6vw, 1.08rem);
  line-height: 1.9;
}

.page-about .about-hero__stats {
  list-style: none;
  margin: clamp(26px, 5vw, 46px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  overflow: hidden;
}

.page-about .about-hero__stats li {
  background: rgba(6, 18, 36, 0.86);
  padding: 15px 18px;
  display: flex;
  align-items: baseline;
  gap: 12px;
  flex-wrap: wrap;
}

.page-about .about-stat__n {
  color: var(--ember);
  font-size: 1.42rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.page-about .about-stat__l {
  color: var(--mist);
  font-size: 0.9rem;
  line-height: 1.5;
}

/* ---------- 时间线 ---------- */
.page-about .about-arc {
  padding: var(--about-gap) 0;
  background: var(--arena);
}

.page-about .about-arc__banner {
  margin: 0 0 clamp(34px, 6vw, 64px);
  border: 1px solid var(--line);
  border-radius: var(--radius-l);
  overflow: hidden;
  background: var(--night);
}

.page-about .about-arc__banner img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.page-about .about-banner__cap {
  padding: 12px 18px 14px;
  color: var(--mist);
  font-size: 0.84rem;
  border-top: 1px solid var(--line);
  background: rgba(12, 32, 56, 0.9);
}

.page-about .about-tl {
  list-style: none;
  margin: 0;
  padding: 0 0 0 24px;
  position: relative;
}

.page-about .about-tl::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--neon) 0%, rgba(47, 243, 208, 0.32) 62%, rgba(47, 243, 208, 0.06) 100%);
}

.page-about .about-tl__item {
  position: relative;
  padding: 0 0 clamp(20px, 4vw, 34px);
}

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

.page-about .about-tl__node {
  position: absolute;
  left: -24px;
  top: 20px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--arena);
  border: 2px solid var(--neon);
  box-shadow: 0 0 0 4px rgba(47, 243, 208, 0.10);
  transition: background var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .about-tl__item:hover .about-tl__node,
.page-about .about-tl__item:focus-within .about-tl__node {
  background: var(--neon);
  box-shadow: 0 0 0 8px rgba(47, 243, 208, 0.16);
}

.page-about .about-tl__body {
  padding: clamp(16px, 3.2vw, 24px);
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  background: linear-gradient(148deg, rgba(12, 32, 56, 0.92) 0%, rgba(6, 18, 36, 0.7) 100%);
  transition: border-color var(--dur) var(--ease);
}

.page-about .about-tl__item:hover .about-tl__body,
.page-about .about-tl__item:focus-within .about-tl__body {
  border-color: rgba(47, 243, 208, 0.42);
}

.page-about .about-tl__year {
  margin: 0 0 6px;
  color: var(--amber);
  font-size: 0.86rem;
  letter-spacing: 0.16em;
}

.page-about .about-tl__title {
  margin: 0 0 8px;
  font-size: clamp(1.05rem, 3.4vw, 1.22rem);
  line-height: 1.4;
}

.page-about .about-tl__text {
  margin: 0;
  color: var(--mist);
  font-size: 0.95rem;
  line-height: 1.85;
}

.page-about .about-tl__hint {
  margin: 12px 0 0;
  padding-top: 10px;
  border-top: 1px dashed var(--line);
  color: rgba(141, 248, 228, 0.82);
  font-size: 0.84rem;
  line-height: 1.65;
}

/* ---------- 业务线 ---------- */
.page-about .about-work {
  padding: var(--about-gap) 0;
  background:
    radial-gradient(80% 60% at 100% 0%, rgba(47, 243, 208, 0.07), transparent 60%),
    var(--night);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .about-lines {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(12px, 2vw, 18px);
}

.page-about .about-lines__row {
  position: relative;
  overflow: hidden;
  display: grid;
  gap: 10px;
  padding: clamp(18px, 3.6vw, 26px) clamp(18px, 3.6vw, 28px);
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  background: linear-gradient(102deg, rgba(6, 18, 36, 0.94) 0%, rgba(12, 32, 56, 0.66) 100%);
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .about-lines__row::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--neon);
}

.page-about .about-lines__row:nth-child(2)::before { background: var(--neon-soft); }
.page-about .about-lines__row:nth-child(3)::before { background: var(--amber); }
.page-about .about-lines__row:nth-child(4)::before { background: var(--ember); }

.page-about .about-lines__row:hover {
  border-color: rgba(47, 243, 208, 0.4);
  transform: translateX(2px);
}

.page-about .about-lines__num {
  color: var(--neon);
  font-size: 0.82rem;
  letter-spacing: 0.2em;
}

.page-about .about-lines__main h3 {
  margin: 0 0 8px;
  font-size: clamp(1.06rem, 3.6vw, 1.3rem);
  line-height: 1.35;
}

.page-about .about-lines__main p {
  margin: 0;
  max-width: 54ch;
  color: var(--mist);
  font-size: 0.94rem;
  line-height: 1.85;
}

/* ---------- 数据准确性 ---------- */
.page-about .about-accuracy {
  padding: var(--about-gap) 0;
  background: var(--arena);
}

.page-about .about-accuracy__grid {
  display: grid;
  gap: clamp(26px, 4.5vw, 52px);
}

.page-about .about-accuracy__fig {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius-l);
  overflow: hidden;
  background: var(--night);
}

.page-about .about-accuracy__fig img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .about-accuracy__cap {
  padding: 12px 18px 14px;
  border-top: 1px solid var(--line);
  color: var(--amber);
  font-size: 0.84rem;
  line-height: 1.6;
  background: rgba(6, 18, 36, 0.9);
}

.page-about .about-accuracy__copy h2 {
  margin: 0 0 14px;
  font-size: clamp(1.5rem, 5.2vw, 2.4rem);
  line-height: 1.22;
}

.page-about .about-accuracy__copy > p {
  margin: 0 0 14px;
  max-width: var(--about-copy);
  color: var(--mist);
  font-size: 0.97rem;
  line-height: 1.9;
}

.page-about .about-facts {
  list-style: none;
  margin: clamp(22px, 3.4vw, 30px) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  overflow: hidden;
}

.page-about .about-facts li {
  background: rgba(12, 32, 56, 0.92);
  padding: 14px 18px;
  display: flex;
  align-items: baseline;
  gap: 14px;
  flex-wrap: wrap;
}

.page-about .about-facts__k {
  color: var(--ember);
  font-size: 1.22rem;
  font-weight: 700;
  min-width: 4ch;
}

.page-about .about-facts__v {
  color: var(--mist);
  font-size: 0.9rem;
  line-height: 1.6;
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  padding: var(--about-gap) 0;
  background: linear-gradient(180deg, var(--night) 0%, var(--arena) 100%);
  border-top: 1px solid var(--line);
}

.page-about .about-team__grid {
  display: grid;
  gap: clamp(28px, 5vw, 56px);
}

.page-about .about-team__ring {
  position: relative;
  margin: 0 auto;
  width: min(300px, 78vw);
}

.page-about .about-team__ring svg {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .about-ring__track {
  fill: none;
  stroke: var(--line);
  stroke-width: 14;
}

.page-about .about-ring__seg {
  fill: none;
  stroke-width: 14;
  transition: stroke-width var(--dur) var(--ease), opacity var(--dur) var(--ease);
}

.page-about .about-ring__seg--a { stroke: var(--neon); }
.page-about .about-ring__seg--b { stroke: var(--amber); }
.page-about .about-ring__seg--c { stroke: var(--ember); }

.page-about .about-team__ring:hover .about-ring__seg {
  stroke-width: 18;
}

.page-about .about-team__center {
  position: absolute;
  inset: 0;
  display: grid;
  place-content: center;
  gap: 4px;
  text-align: center;
  pointer-events: none;
}

.page-about .about-team__total {
  display: block;
  font-size: clamp(2rem, 8vw, 2.9rem);
  font-weight: 700;
  line-height: 1;
  color: var(--paper);
}

.page-about .about-team__sub {
  display: block;
  color: var(--mist);
  font-size: 0.82rem;
  letter-spacing: 0.16em;
}

.page-about .about-team__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(12px, 2vw, 18px);
}

.page-about .about-team__item {
  padding: clamp(15px, 2.8vw, 20px) clamp(16px, 3vw, 22px);
  border: 1px solid var(--line);
  border-left: 3px solid var(--neon);
  border-radius: var(--radius-m);
  background: var(--glass);
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-team__item--b { border-left-color: var(--amber); }
.page-about .about-team__item--c { border-left-color: var(--ember); }

.page-about .about-team__item:hover {
  background: rgba(122, 190, 255, 0.16);
  border-color: var(--glass-line);
}

.page-about .about-team__head {
  margin: 0 0 8px;
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.page-about .about-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--neon);
  flex: none;
}

.page-about .about-team__item--b .about-dot { background: var(--amber); }
.page-about .about-team__item--c .about-dot { background: var(--ember); }

.page-about .about-team__name {
  font-size: 1.02rem;
  font-weight: 700;
  letter-spacing: 0.01em;
}

.page-about .about-team__num {
  margin-left: auto;
  color: var(--paper);
  font-size: 1rem;
  letter-spacing: 0.04em;
}

.page-about .about-team__desc {
  margin: 0;
  color: var(--mist);
  font-size: 0.92rem;
  line-height: 1.85;
}

/* ---------- 协作与认可 ---------- */
.page-about .about-collab {
  padding: var(--about-gap) 0;
  background: var(--arena);
}

.page-about .about-collab__grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  overflow: hidden;
}

.page-about .about-collab__cell {
  background: rgba(12, 32, 56, 0.86);
  padding: clamp(18px, 3.4vw, 26px);
  transition: background var(--dur) var(--ease);
}

.page-about .about-collab__cell:hover {
  background: rgba(12, 32, 56, 1);
}

.page-about .about-collab__n {
  display: block;
  color: var(--neon);
  font-size: clamp(1.7rem, 6vw, 2.3rem);
  font-weight: 700;
  line-height: 1;
}

.page-about .about-collab__l {
  margin: 8px 0 8px;
  font-size: 1rem;
  font-weight: 700;
}

.page-about .about-collab__d {
  margin: 0;
  color: var(--mist);
  font-size: 0.9rem;
  line-height: 1.8;
}

.page-about .about-honor {
  margin: clamp(24px, 4vw, 38px) 0 0;
  padding: clamp(16px, 3vw, 22px) clamp(18px, 3.4vw, 26px);
  display: flex;
  align-items: flex-start;
  gap: 14px;
  flex-wrap: wrap;
  border: 1px solid var(--glass-line);
  border-radius: var(--radius-m);
  background: linear-gradient(100deg, rgba(255, 194, 75, 0.10) 0%, rgba(6, 18, 36, 0.4) 100%);
}

.page-about .about-honor p {
  margin: 0;
  flex: 1 1 24ch;
  color: var(--paper);
  font-size: 0.94rem;
  line-height: 1.8;
}

/* ---------- 服务范围 ---------- */
.page-about .about-reach {
  padding: var(--about-gap) 0 clamp(48px, 8vw, 96px);
  background: linear-gradient(180deg, var(--night) 0%, var(--arena) 100%);
  border-top: 1px solid var(--line);
}

.page-about .about-reach__panel {
  padding: clamp(24px, 5vw, 48px);
  border: 1px solid var(--glass-line);
  border-radius: var(--radius-l);
  background:
    radial-gradient(88% 118% at 0% 0%, rgba(47, 243, 208, 0.14), transparent 62%),
    radial-gradient(70% 100% at 100% 100%, rgba(255, 138, 43, 0.10), transparent 66%),
    linear-gradient(150deg, var(--night) 0%, var(--arena) 100%);
}

.page-about .about-reach__panel h2 {
  margin: 0 0 14px;
  font-size: clamp(1.5rem, 5.2vw, 2.4rem);
  line-height: 1.22;
}

.page-about .about-reach__panel > p {
  margin: 0;
  max-width: 52ch;
  color: var(--mist);
  font-size: 0.97rem;
  line-height: 1.9;
}

.page-about .about-reach__facts {
  list-style: none;
  margin: clamp(22px, 3.6vw, 30px) 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-reach__facts li {
  padding-left: 16px;
  position: relative;
  color: var(--paper);
  font-size: 0.93rem;
  line-height: 1.8;
}

.page-about .about-reach__facts li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--neon);
}

.page-about .about-reach__facts .mono {
  color: var(--ember);
  font-weight: 700;
  font-size: 1.05rem;
}

.page-about .about-reach__cta {
  margin-top: clamp(24px, 4vw, 34px);
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-reach__fig {
  margin: clamp(28px, 5vw, 48px) 0 0;
  border: 1px solid var(--line);
  border-radius: var(--radius-l);
  overflow: hidden;
  background: var(--night);
}

.page-about .about-reach__fig img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.page-about .about-reach__cap {
  padding: 12px 18px 14px;
  border-top: 1px solid var(--line);
  color: var(--mist);
  font-size: 0.84rem;
  line-height: 1.6;
  background: rgba(6, 18, 36, 0.9);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-tl {
    padding-left: 30px;
  }

  .page-about .about-tl__node {
    left: -30px;
  }

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

@media (min-width: 900px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-hero__stats li {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
  }

  .page-about .about-tl__body {
    transition: border-color var(--dur) var(--ease), max-width var(--dur) var(--ease);
  }

  .page-about .about-tl__item:nth-child(1) .about-tl__body { max-width: 520px; }
  .page-about .about-tl__item:nth-child(2) .about-tl__body { max-width: 600px; }
  .page-about .about-tl__item:nth-child(3) .about-tl__body { max-width: 700px; }
  .page-about .about-tl__item:nth-child(4) .about-tl__body { max-width: 790px; }
  .page-about .about-tl__item:nth-child(5) .about-tl__body { max-width: 870px; }
  .page-about .about-tl__item:nth-child(6) .about-tl__body { max-width: 940px; }

  .page-about .about-lines__row:nth-child(1) { width: 100%; }
  .page-about .about-lines__row:nth-child(2) { width: 88%; }
  .page-about .about-lines__row:nth-child(3) { width: 76%; }
  .page-about .about-lines__row:nth-child(4) { width: 64%; }

  .page-about .about-accuracy__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: center;
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(230px, 300px) minmax(0, 1fr);
    align-items: center;
  }

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

@media (min-width: 1180px) {
  .page-about .about-hero__lede {
    font-size: 1.12rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-lines__row:hover {
    transform: none;
  }
}