.page-about {
  background: var(--ink);
  color: var(--read);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(28px, 6vw, 72px) 0 clamp(32px, 5vw, 60px);
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(90% 120% at 8% 0%, rgba(63, 230, 200, .07), transparent 62%),
    var(--ink);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: -1px;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(63, 230, 200, .45), transparent);
}

.page-about .about-crumbs {
  margin-bottom: clamp(18px, 3vw, 30px);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(26px, 5vw, 52px);
  align-items: center;
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-family: var(--font-title);
  font-size: clamp(30px, 6vw, 58px);
  line-height: 1.08;
  letter-spacing: -.01em;
  color: var(--read);
}

.page-about .about-hero__lead {
  margin: 18px 0 0;
  max-width: 58ch;
  font-size: clamp(15px, 1.85vw, 17px);
  line-height: 1.78;
  color: var(--mist);
}

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

.page-about .about-hero__visual {
  position: relative;
  aspect-ratio: 5 / 4;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background:
    radial-gradient(120% 100% at 18% 8%, rgba(63, 230, 200, .16), transparent 58%),
    linear-gradient(158deg, var(--forest) 0%, var(--char) 100%);
  box-shadow: var(--shadow-1);
  overflow: hidden;
}

.page-about .about-hero__visual::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(63, 230, 200, .085) 1px, transparent 1px),
    linear-gradient(90deg, rgba(63, 230, 200, .085) 1px, transparent 1px);
  background-size: 34px 34px;
  -webkit-mask-image: radial-gradient(78% 68% at 50% 50%, #000 38%, transparent 100%);
  mask-image: radial-gradient(78% 68% at 50% 50%, #000 38%, transparent 100%);
}

.page-about .about-orbit {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
}

.page-about .about-orbit__ring {
  position: absolute;
  border-radius: 50%;
  border: 1px solid rgba(63, 230, 200, .34);
}

.page-about .about-orbit__ring--a {
  width: 56%;
  aspect-ratio: 1;
}

.page-about .about-orbit__ring--b {
  width: 84%;
  aspect-ratio: 1;
  border-style: dashed;
  border-color: rgba(229, 163, 60, .3);
}

.page-about .about-orbit__core {
  width: 21%;
  aspect-ratio: 1;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 30%, #7ff5df, var(--cyan) 55%, rgba(63, 230, 200, .12) 100%);
  box-shadow: 0 0 46px rgba(63, 230, 200, .42);
}

.page-about .about-orbit__node {
  position: absolute;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--amber);
  box-shadow: 0 0 0 4px rgba(229, 163, 60, .14);
}

.page-about .about-orbit__node--1 { top: 21%; left: 26%; }
.page-about .about-orbit__node--2 {
  bottom: 23%; right: 21%;
  background: var(--cinnabar-lt);
  box-shadow: 0 0 0 4px rgba(193, 80, 63, .2);
}
.page-about .about-orbit__node--3 { bottom: 33%; left: 18%; }

/* ---------- 主体栅格与章节索引 ---------- */
.page-about .about-layout {
  padding-top: clamp(26px, 4vw, 44px);
}

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

.page-about .about-flow {
  display: flex;
  flex-direction: column;
  gap: clamp(46px, 6.5vw, 96px);
  padding-bottom: clamp(56px, 8vw, 110px);
}

.page-about .about-block {
  scroll-margin-top: 110px;
}

.page-about .about-head {
  margin-bottom: clamp(18px, 3vw, 30px);
}

.page-about .about-head h2 {
  margin: 10px 0 0;
  font-family: var(--font-title);
  font-size: clamp(23px, 3.4vw, 34px);
  line-height: 1.16;
  letter-spacing: -.005em;
  color: var(--read);
}

/* ---------- 正文与引语 ---------- */
.page-about .about-text p {
  margin: 0 0 14px;
  font-size: 16px;
  line-height: 1.78;
  color: var(--mist);
}

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

.page-about .about-text--tight {
  max-width: 62ch;
  margin-bottom: clamp(18px, 3vw, 28px);
}

.page-about .about-split {
  display: grid;
  gap: clamp(20px, 3.4vw, 36px);
}

.page-about .about-quote {
  margin: 0;
  padding: 18px 22px;
  border-left: 2px solid var(--amber);
  border-radius: 0 var(--radius) var(--radius) 0;
  background: rgba(229, 163, 60, .06);
  font-family: var(--font-serif);
  font-size: 17px;
  line-height: 1.75;
  color: var(--paper);
}

/* ---------- 时间轴 ---------- */
.page-about .timeline-wrap {
  position: relative;
  padding: clamp(20px, 3vw, 38px);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: linear-gradient(180deg, rgba(22, 48, 42, .62), rgba(12, 31, 26, .28));
  overflow: hidden;
}

.page-about .timeline-wrap__bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .17;
  filter: saturate(.7);
  z-index: 0;
  pointer-events: none;
}

.page-about .tl {
  position: relative;
  z-index: 1;
  margin: 0;
  padding: 0 0 0 28px;
  list-style: none;
}

.page-about .tl::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan), rgba(63, 230, 200, .06));
}

.page-about .tl__item {
  position: relative;
  padding-bottom: clamp(20px, 2.6vw, 28px);
}

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

.page-about .tl__item::before {
  content: "";
  position: absolute;
  left: -28px;
  top: 7px;
  width: 11px;
  height: 11px;
  border-radius: 2px;
  background: var(--amber);
  box-shadow: 0 0 0 4px rgba(229, 163, 60, .13);
  transition: background var(--t), box-shadow var(--t);
}

.page-about .tl__item:hover::before,
.page-about .tl__item:focus-within::before {
  background: var(--cyan);
  box-shadow: 0 0 0 5px rgba(63, 230, 200, .18);
}

.page-about .tl__year {
  display: inline-block;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--amber);
}

.page-about .tl__title {
  margin: 0 0 6px;
  font-family: var(--font-title);
  font-size: clamp(17px, 2.2vw, 20px);
  line-height: 1.3;
  color: var(--read);
}

.page-about .tl__text {
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--mist);
  transition: color var(--t);
}

.page-about .tl__item:hover .tl__text,
.page-about .tl__item:focus-within .tl__text {
  color: var(--read);
}

/* ---------- 团队 ---------- */
.page-about .team-grid {
  display: grid;
  gap: clamp(24px, 4vw, 40px);
}

.page-about .team-bar {
  padding: 14px 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .team-bar:first-child {
  padding-top: 0;
}

.page-about .team-bar:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .team-bar__meta {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
}

.page-about .team-bar__name {
  font-family: var(--font-title);
  font-size: 18px;
  letter-spacing: .01em;
  color: var(--read);
}

.page-about .team-bar__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 17px;
  color: var(--amber);
}

.page-about .team-bar__track {
  position: relative;
  height: 6px;
  margin: 10px 0 9px;
  border-radius: 99px;
  background: rgba(140, 154, 148, .16);
  overflow: hidden;
}

.page-about .team-bar__fill {
  display: block;
  height: 100%;
  border-radius: 99px;
  background: linear-gradient(90deg, rgba(63, 230, 200, .45), var(--cyan));
}

.page-about .team-bar__fill--a { width: 34.6%; }
.page-about .team-bar__fill--b { width: 30.8%; }
.page-about .team-bar__fill--c { width: 26.9%; }
.page-about .team-bar__fill--d {
  width: 7.7%;
  background: linear-gradient(90deg, rgba(229, 163, 60, .45), var(--amber));
}

.page-about .team-bar__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--mist);
}

.page-about .team-media {
  margin: 0;
}

.page-about .team-media img {
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
}

/* ---------- 六个专区 ---------- */
.page-about .zone-list {
  display: grid;
  gap: 1px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--line);
  overflow: hidden;
}

.page-about .zone-cell {
  padding: 18px 20px;
  background: var(--forest);
}

.page-about .zone-cell__tag {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .zone-cell h3 {
  margin: 0 0 6px;
  font-family: var(--font-title);
  font-size: 17px;
  line-height: 1.3;
  color: var(--read);
}

.page-about .zone-cell p {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--mist);
}

/* ---------- 服务范围 ---------- */
.page-about .scope {
  display: grid;
  gap: clamp(24px, 4vw, 40px);
}

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

.page-about .scope__media img {
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
}

.page-about .scope__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(16px, 2.6vw, 26px);
}

.page-about .scope-stat {
  padding-top: 12px;
  border-top: 1px solid var(--line);
}

.page-about .scope-stat__v {
  display: inline-block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(22px, 3.2vw, 32px);
  line-height: 1.1;
  color: var(--amber);
  word-break: break-word;
}

.page-about .scope-stat__u {
  display: inline-block;
  margin-left: 5px;
  font-size: 12px;
  color: var(--mist);
}

.page-about .scope-stat__l {
  margin: 6px 0 0;
  font-size: 13px;
  line-height: 1.68;
  color: var(--mist);
}

/* ---------- 合作与认可 ---------- */
.page-about .partner-grid {
  display: grid;
  gap: 16px;
}

.page-about .partner-card {
  padding: 22px;
}

.page-about .partner-card__k {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .partner-card__title {
  margin: 0 0 8px;
  font-family: var(--font-title);
  font-size: 19px;
  line-height: 1.3;
  color: var(--read);
}

.page-about .partner-card__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .award {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 20px;
  margin-top: 20px;
  padding: 18px 22px;
  border: 1px dashed var(--line-amber);
  border-radius: var(--radius);
  background: rgba(229, 163, 60, .05);
}

.page-about .award__k {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--amber);
}

.page-about .award__v {
  margin: 0;
  flex: 1 1 260px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--read);
}

/* ---------- 结尾入口 ---------- */
.page-about .about-next {
  padding-top: clamp(28px, 4vw, 46px);
  border-top: 1px solid var(--line);
}

.page-about .about-next__grid {
  display: grid;
  gap: 16px;
}

.page-about .next-card {
  display: block;
  padding: clamp(20px, 3vw, 28px);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: linear-gradient(160deg, var(--forest), rgba(18, 22, 26, .88));
  text-decoration: none;
  transition: transform var(--t), border-color var(--t), box-shadow var(--t);
}

.page-about .next-card:hover,
.page-about .next-card:focus-visible {
  transform: translateY(-2px);
  border-color: var(--line-amber);
  box-shadow: var(--shadow-1);
}

.page-about .next-card__kicker {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .next-card__title {
  display: block;
  margin: 8px 0 10px;
  font-family: var(--font-title);
  font-size: clamp(19px, 2.4vw, 23px);
  line-height: 1.3;
  color: var(--read);
}

.page-about .next-card__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--mist);
}

.page-about .about-next__note {
  margin: 20px 0 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-next__note a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(63, 230, 200, .38);
  padding-bottom: 1px;
}

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

/* ---------- 图片通用 ---------- */
.page-about img {
  max-width: 100%;
  height: auto;
  display: block;
}

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

@media (min-width: 760px) {
  .page-about .partner-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .page-about .about-split {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
    align-items: start;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, .88fr);
  }

  .page-about .team-grid {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, .75fr);
    align-items: start;
  }

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

@media (min-width: 1000px) {
  .page-about .about-layout {
    display: grid;
    grid-template-columns: minmax(170px, 3fr) minmax(0, 9fr);
    gap: clamp(32px, 4vw, 64px);
    align-items: start;
  }

  .page-about .about-toc {
    display: block;
    position: sticky;
    top: 108px;
    align-self: start;
  }
}

@media (min-width: 1100px) {
  .page-about .zone-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-hero__visual {
    aspect-ratio: 4 / 3;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .next-card,
  .page-about .tl__item::before,
  .page-about .tl__text {
    transition: none;
  }
}
</main>