.page-about {
  background: var(--ink);
  color: var(--mist);
  overflow-x: clip;
  padding-bottom: clamp(8px, 1.4vw, 16px);
}

.page-about .breadcrumb {
  margin-bottom: clamp(16px, 2.4vw, 28px);
}

.page-about h2 {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(26px, 3.4vw, 46px);
  line-height: 1.14;
  letter-spacing: -0.02em;
  margin: 0 0 clamp(14px, 2vw, 22px);
  text-wrap: balance;
}

.page-about h3 {
  font-family: var(--font-head);
  font-weight: 800;
  letter-spacing: -0.01em;
}

.page-about .eyebrow {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 clamp(12px, 1.6vw, 18px);
}

.page-about .section-no {
  color: var(--lake-light);
  border-bottom: 1px solid var(--hairline-strong);
  padding-bottom: 2px;
}

/* ---------- 开场 ---------- */
.page-about .about-hero {
  position: relative;
  padding-block: clamp(16px, 2.6vw, 30px) clamp(40px, 5.6vw, 84px);
  isolation: isolate;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -12% -18% auto -18%;
  height: clamp(220px, 34vw, 380px);
  background:
    radial-gradient(58% 100% at 26% 0%, rgba(27, 143, 168, 0.3), transparent 70%),
    radial-gradient(46% 100% at 84% 6%, rgba(107, 79, 168, 0.26), transparent 74%);
  pointer-events: none;
  z-index: -1;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 100%;
  background-image:
    linear-gradient(rgba(95, 211, 228, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(95, 211, 228, 0.05) 1px, transparent 1px);
  background-size: 64px 64px;
  pointer-events: none;
  z-index: -1;
  mask-image: linear-gradient(180deg, #000 0%, transparent 78%);
  -webkit-mask-image: linear-gradient(180deg, #000 0%, transparent 78%);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(26px, 3.6vw, 46px);
}

.page-about .about-hero__lead h1 {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(32px, 5.8vw, 72px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  margin: 0 0 clamp(18px, 2.4vw, 28px);
  text-wrap: balance;
}

.page-about .about-hero__text {
  margin: 0 0 16px;
  font-size: clamp(15px, 1.25vw, 17px);
  line-height: 1.85;
  color: rgba(245, 242, 236, 0.82);
  max-width: 36em;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: clamp(20px, 2.6vw, 30px) 0 0;
}

.page-about .about-facts {
  border: 1px solid var(--hairline);
  border-top: 3px solid var(--lake);
  background: linear-gradient(180deg, var(--ink-2), var(--ink-3));
  padding: clamp(20px, 2.4vw, 28px);
}

.page-about .about-facts__title {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--rock);
  text-transform: uppercase;
}

.page-about .about-facts__list {
  margin: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-facts__list > div {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  padding-bottom: 12px;
  border-bottom: 1px dashed rgba(95, 211, 228, 0.16);
}

.page-about .about-facts__list > div:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .about-facts__list dt {
  font-size: 14px;
  color: var(--rock);
  line-height: 1.5;
}

.page-about .about-facts__list dd {
  margin: 0;
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: clamp(24px, 2.6vw, 32px);
  line-height: 1;
  color: var(--lake-light);
}

.page-about .about-facts__unit {
  font-family: var(--font-body);
  font-size: 13px;
  color: var(--rock);
  margin-left: 4px;
}

/* ---------- 时间带 ---------- */
.page-about .about-timeline {
  padding-block: clamp(32px, 4.4vw, 62px) 0;
  background: linear-gradient(180deg, rgba(58, 43, 94, 0.42), rgba(6, 18, 26, 0) 66%);
}

.page-about .about-timeline__intro {
  margin: 0;
  max-width: 40em;
  font-size: clamp(15px, 1.2vw, 16px);
  line-height: 1.85;
  color: var(--rock);
}

.page-about .about-timeline__media {
  margin-top: clamp(22px, 3vw, 34px);
}

.page-about .about-timeline__media img {
  border: 1px solid var(--hairline);
}

.page-about .about-timeline__track {
  margin-top: clamp(20px, 2.8vw, 32px);
  overflow-x: auto;
  overscroll-behavior-x: contain;
  scroll-snap-type: x proximity;
  padding: 4px var(--gutter) 22px;
  scrollbar-width: thin;
  scrollbar-color: var(--lake) rgba(95, 211, 228, 0.12);
}

.page-about .about-timeline__track:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: 4px;
}

.page-about .about-timeline__track::-webkit-scrollbar {
  height: 6px;
}

.page-about .about-timeline__track::-webkit-scrollbar-thumb {
  background: var(--lake);
}

.page-about .about-timeline__track::-webkit-scrollbar-track {
  background: rgba(95, 211, 228, 0.1);
}

.page-about .about-track {
  display: flex;
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-track__item {
  flex: 0 0 min(78vw, 300px);
  scroll-snap-align: start;
  border: 1px solid var(--hairline);
  border-top: 3px solid var(--lake);
  background: linear-gradient(180deg, rgba(12, 34, 48, 0.96), rgba(8, 22, 31, 0.96));
  padding: 18px 18px 22px;
  transition: border-color 0.24s var(--ease-track), transform 0.24s var(--ease-track);
}

.page-about .about-track__item:hover {
  border-color: var(--hairline-strong);
  transform: translateY(-4px);
}

.page-about .about-track__item--now {
  border-top-color: var(--amber);
  background: linear-gradient(180deg, rgba(58, 43, 94, 0.55), rgba(8, 22, 31, 0.96));
}

.page-about .about-track__idx {
  display: block;
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--lake-light);
  margin-bottom: 10px;
}

.page-about .about-track__item--now .about-track__idx {
  color: var(--amber);
}

.page-about .about-track__title {
  margin: 0 0 8px;
  font-size: 17px;
  line-height: 1.45;
  color: var(--mist);
}

.page-about .about-track__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--rock);
}

/* ---------- 规则结构（纸砂亮面） ---------- */
.page-about .about-structure {
  position: relative;
  margin-top: clamp(34px, 4.6vw, 68px);
  padding-block: clamp(38px, 5.2vw, 82px);
  background: var(--sand);
  color: var(--ink);
}

.page-about .about-structure::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 6px;
  background: linear-gradient(90deg, var(--lake) 0 34%, var(--violet) 34% 68%, var(--amber) 68% 100%);
}

.page-about .about-structure__grid {
  display: grid;
  gap: clamp(24px, 3.2vw, 44px);
}

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

.page-about .about-structure__figure img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid rgba(6, 18, 26, 0.22);
  background: #E3DDD1;
}

.page-about .about-structure__caption {
  margin: 12px 0 0;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.7;
  color: #4A5C66;
}

.page-about .about-structure h2 {
  color: var(--ink);
}

.page-about .about-structure .eyebrow {
  color: #4A5C66;
}

.page-about .about-structure .section-no {
  color: #0B6675;
  border-bottom-color: rgba(11, 102, 117, 0.4);
}

.page-about .about-structure__body p {
  margin: 0 0 16px;
  font-size: clamp(15px, 1.2vw, 16px);
  line-height: 1.85;
  color: #16303C;
  max-width: 38em;
}

.page-about .about-structure__list {
  list-style: none;
  margin: clamp(20px, 2.4vw, 28px) 0 0;
  padding: 0;
  display: grid;
}

.page-about .about-structure__list li {
  border-left: 3px solid var(--lake);
  border-bottom: 1px solid rgba(6, 18, 26, 0.14);
  padding: 12px 0 12px 16px;
  font-size: 15px;
  line-height: 1.75;
  color: #16303C;
}

.page-about .about-structure__list li:last-child {
  border-bottom: 0;
}

.page-about .about-structure__list .mono {
  display: inline-block;
  margin-right: 10px;
  font-size: 13px;
  color: #0B6675;
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  padding-block: clamp(38px, 5.2vw, 82px);
}

.page-about .about-team__grid {
  display: grid;
  gap: clamp(22px, 3vw, 40px);
}

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

.page-about .about-team__figure img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--hairline);
}

.page-about .about-team__group {
  padding: 18px 0 20px;
  border-top: 1px solid var(--hairline-strong);
}

.page-about .about-team__group h3 {
  margin: 0 0 8px;
  font-size: 19px;
  line-height: 1.4;
  color: var(--mist);
}

.page-about .about-team__group h3 .mono {
  color: var(--lake-light);
  font-size: 13px;
  font-weight: 500;
  margin-right: 10px;
}

.page-about .about-team__group p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--rock);
}

.page-about .about-team__rhythm {
  margin: clamp(22px, 3vw, 34px) 0 0;
  padding: 16px 18px;
  border-left: 3px solid var(--amber);
  background: rgba(242, 178, 60, 0.08);
  font-size: 14px;
  line-height: 1.85;
  color: var(--mist);
}

/* ---------- 三条准则 ---------- */
.page-about .about-principles {
  padding-block: clamp(34px, 4.6vw, 72px);
  background: linear-gradient(180deg, rgba(12, 34, 48, 0.92), rgba(6, 18, 26, 0.92));
  border-top: 1px solid var(--hairline);
  border-bottom: 1px solid var(--hairline);
}

.page-about .about-principles__list {
  list-style: none;
  margin: clamp(20px, 2.8vw, 32px) 0 0;
  padding: 0;
  display: grid;
}

.page-about .about-principles__item {
  padding: 20px 0 24px;
  border-top: 1px solid var(--hairline-strong);
}

.page-about .about-principles__item h3 {
  margin: 0 0 10px;
  font-size: clamp(19px, 1.9vw, 23px);
  line-height: 1.35;
  color: var(--mist);
}

.page-about .about-principles__item > p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--rock);
}

.page-about .about-principles__item ul {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  display: grid;
  gap: 9px;
}

.page-about .about-principles__item ul li {
  position: relative;
  padding-left: 17px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .about-principles__item ul li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 6px;
  height: 6px;
  background: var(--lake-light);
}

/* ---------- 覆盖范围 ---------- */
.page-about .about-reach {
  padding-block: clamp(38px, 5.2vw, 84px);
}

.page-about .about-reach__grid {
  display: grid;
  gap: clamp(24px, 3.4vw, 48px);
}

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

.page-about .about-reach__dot {
  fill: var(--lake-light);
  opacity: 0.72;
  transform-box: fill-box;
  transform-origin: center;
  transition: opacity 0.22s var(--ease-track), transform 0.22s var(--ease-track), fill 0.22s var(--ease-track);
}

.page-about .about-reach__dot:hover {
  opacity: 1;
  fill: var(--amber);
  transform: scale(1.55);
}

.page-about .about-reach__dot--origin {
  fill: var(--amber);
  opacity: 1;
}

.page-about .about-reach__legend {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 16px 0 0;
  font-size: 13px;
  color: var(--rock);
}

.page-about .about-reach__legend-dot {
  width: 8px;
  height: 8px;
  background: var(--lake-light);
  display: inline-block;
}

.page-about .about-reach__body p {
  margin: 0 0 16px;
  font-size: clamp(15px, 1.2vw, 16px);
  line-height: 1.85;
  color: rgba(245, 242, 236, 0.84);
  max-width: 36em;
}

.page-about .about-reach__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 2.6vw, 30px);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-facts__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px 20px;
  }

  .page-about .about-facts__list > div {
    display: block;
    padding-bottom: 0;
    border-bottom: 0;
  }

  .page-about .about-facts__list dt {
    margin-bottom: 8px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 0.78fr);
    align-items: start;
  }

  .page-about .about-facts {
    position: sticky;
    top: clamp(24px, 4vw, 48px);
  }

  .page-about .about-structure__grid {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
    align-items: center;
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 0.82fr) minmax(0, 1.18fr);
    align-items: start;
  }

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

@media (min-width: 860px) {
  .page-about .about-principles__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-principles__item {
    border-top: 0;
    border-left: 1px solid var(--hairline-strong);
    padding: 4px 26px 10px;
  }

  .page-about .about-principles__item:first-child {
    border-left: 0;
    padding-left: 0;
  }

  .page-about .about-principles__item:last-child {
    padding-right: 0;
  }
}

@media (min-width: 1080px) {
  .page-about .about-track__item {
    flex-basis: 308px;
  }

  .page-about .about-hero__text {
    font-size: 17px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-track__item,
  .page-about .about-reach__dot {
    transition: none;
  }

  .page-about .about-track__item:hover {
    transform: none;
  }
}