.page-about {
  --about-section-y: clamp(56px, 9vw, 112px);
  --about-soft-text: rgba(230, 236, 246, .84);
  --about-ink-text: #3f4c5c;
  background: var(--yx-deep);
  color: var(--yx-read);
  font-family: var(--yx-font-body);
  font-size: 16px;
  line-height: 1.75;
  overflow-x: clip;
}

.page-about h1,
.page-about h2,
.page-about h3 {
  margin: 0;
  font-family: var(--yx-font-display);
  font-weight: 800;
  letter-spacing: -.02em;
  line-height: 1.18;
}

.page-about p {
  margin: 0 0 1.05em;
}

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

.page-about a {
  color: var(--yx-cyan);
  text-decoration: none;
}

.page-about a:hover {
  text-decoration: underline;
}

.page-about :focus-visible {
  outline: 2px solid var(--yx-cyan);
  outline-offset: 3px;
  border-radius: var(--yx-r-sm);
}

.page-about .yx-media {
  display: block;
  width: 100%;
  overflow: hidden;
  border: 1px solid var(--yx-line);
  border-radius: var(--yx-r-md);
  background: var(--yx-layer);
}

.page-about .yx-media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .yx-media__cap {
  display: block;
  margin-top: 10px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--yx-slate);
}

/* ---------- 首屏 ---------- */

.about-hero {
  position: relative;
  padding: calc(var(--yx-header-h) + 26px) 0 clamp(42px, 7vw, 80px);
  background:
    radial-gradient(circle at 78% 12%, rgba(53, 227, 212, .18), transparent 56%),
    radial-gradient(circle at 6% 92%, rgba(79, 124, 92, .22), transparent 52%),
    linear-gradient(180deg, var(--yx-night) 0%, var(--yx-deep) 78%);
  border-bottom: 1px solid var(--yx-line-soft);
}

.about-hero__grid {
  display: grid;
  gap: clamp(28px, 5vw, 56px);
  margin-top: clamp(20px, 3.4vw, 34px);
}

.about-hero__title {
  font-size: clamp(30px, 5.2vw, 56px);
  margin: 14px 0 18px;
}

.about-hero__lead .yx-lede {
  max-width: 60ch;
}

.about-hero__note {
  margin-top: 16px;
  max-width: 62ch;
  font-size: 15px;
  color: var(--about-soft-text);
}

.about-hero__media .yx-media {
  border-radius: var(--yx-r-lg);
  box-shadow: var(--yx-shadow-lift);
}

.about-stats {
  list-style: none;
  margin: clamp(26px, 4vw, 38px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--yx-line-soft);
  border: 1px solid var(--yx-line-soft);
  border-radius: var(--yx-r-md);
  overflow: hidden;
}

.about-stats li {
  background: rgba(11, 27, 51, .92);
  padding: 14px 16px;
}

.about-stats b {
  display: block;
  font-family: var(--yx-font-mono);
  font-size: clamp(20px, 3vw, 28px);
  line-height: 1.2;
  color: var(--yx-cyan);
  font-variant-numeric: tabular-nums;
}

.about-stats span {
  display: block;
  margin-top: 4px;
  font-size: 12.5px;
  letter-spacing: .03em;
  color: var(--yx-slate);
}

/* ---------- 区块骨架 ---------- */

.about-section {
  position: relative;
  padding: var(--about-section-y) 0;
}

.about-section--deep {
  background: var(--yx-deep);
}

.about-section--night {
  background: linear-gradient(180deg, var(--yx-night), var(--yx-deep));
  border-top: 1px solid var(--yx-line-soft);
  border-bottom: 1px solid var(--yx-line-soft);
}

.about-section--cream {
  background: var(--yx-cream);
  color: var(--yx-deep);
}

.about-section__head {
  max-width: 740px;
  margin-bottom: clamp(28px, 4.6vw, 54px);
}

.about-section__head h2 {
  font-size: clamp(24px, 3.6vw, 40px);
  margin: 10px 0 14px;
}

.about-section__head p {
  font-size: 15.5px;
  color: var(--yx-slate);
}

.about-section--cream .about-section__head p {
  color: var(--about-ink-text);
}

.about-section--cream .yx-eyebrow {
  color: var(--yx-moss);
}

/* ---------- 起点 ---------- */

.about-origin__grid {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
  align-items: start;
}

.about-origin__text p {
  max-width: 64ch;
  color: var(--about-soft-text);
}

.about-origin__panel {
  padding: clamp(22px, 3.4vw, 32px);
  border: 1px solid var(--yx-line);
  border-radius: var(--yx-r-lg);
  background: linear-gradient(158deg, rgba(193, 112, 90, .2), rgba(20, 41, 74, .72) 62%);
}

.about-origin__panel h3 {
  font-size: 17px;
  margin-bottom: 18px;
  color: var(--yx-cream);
}

.about-panel__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.about-panel__list li {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  padding-bottom: 12px;
  border-bottom: 1px dashed var(--yx-line-soft);
  font-size: 14px;
}

.about-panel__list li:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.about-panel__list span {
  color: var(--yx-slate);
}

.about-panel__list b {
  font-family: var(--yx-font-mono);
  font-weight: 600;
  color: var(--yx-orange);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

/* ---------- 数据 ---------- */

.about-data__grid {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
  align-items: start;
}

.about-data__figure {
  margin: 0;
}

.about-data__figure .yx-media {
  border-radius: var(--yx-r-lg);
  border-color: rgba(11, 27, 51, .12);
  background: rgba(11, 27, 51, .06);
}

.about-data__body p {
  max-width: 66ch;
  color: var(--about-ink-text);
}

.about-data__aside {
  margin-top: 22px;
  padding: 16px 20px;
  border-left: 3px solid var(--yx-moss);
  border-radius: 0 var(--yx-r-sm) var(--yx-r-sm) 0;
  background: rgba(79, 124, 92, .1);
  font-size: 14.5px;
}

.about-details {
  margin-top: 22px;
  border: 1px solid rgba(11, 27, 51, .14);
  border-radius: var(--yx-r-md);
  background: var(--yx-white);
  overflow: hidden;
}

.about-details summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 18px;
  list-style: none;
  cursor: pointer;
  font-size: 15px;
  font-weight: 600;
  color: var(--yx-deep);
}

.about-details summary::-webkit-details-marker {
  display: none;
}

.about-details summary::after {
  content: "＋";
  flex: none;
  font-family: var(--yx-font-mono);
  color: var(--yx-moss);
}

.about-details[open] summary::after {
  content: "−";
}

.about-details[open] summary {
  border-bottom: 1px solid rgba(11, 27, 51, .1);
}

.about-details__body {
  padding: 14px 18px 16px;
  font-size: 14.5px;
  color: var(--about-ink-text);
}

/* ---------- 团队 ---------- */

.about-team__grid {
  display: grid;
  gap: 18px;
}

.about-team__card {
  padding: clamp(20px, 3vw, 30px);
  border: 1px solid var(--yx-line);
  border-radius: var(--yx-r-lg);
  background: linear-gradient(180deg, var(--yx-layer), rgba(20, 41, 74, .5));
  transition: transform .25s ease, border-color .25s ease;
}

.about-team__card:hover {
  transform: translateY(-2px);
  border-color: rgba(53, 227, 212, .45);
}

.about-team__num {
  display: block;
  font-family: var(--yx-font-mono);
  font-size: clamp(26px, 3.6vw, 40px);
  line-height: 1.1;
  color: var(--yx-cyan);
  font-variant-numeric: tabular-nums;
}

.about-team__unit {
  display: block;
  margin-top: 6px;
  font-size: 12.5px;
  letter-spacing: .05em;
  color: var(--yx-slate);
}

.about-team__card h3 {
  font-size: 18px;
  margin: 14px 0 10px;
  color: var(--yx-cream);
}

.about-team__card p {
  font-size: 14.8px;
  color: var(--about-soft-text);
}

/* ---------- 里程碑 ---------- */

.about-band {
  margin-bottom: clamp(30px, 5vw, 56px);
}

.about-band .yx-media {
  border-radius: var(--yx-r-lg);
}

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

.about-tl::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 8px;
  bottom: 10px;
  width: 2px;
  border-radius: var(--yx-pill);
  background: linear-gradient(180deg, var(--yx-cyan) 0%, rgba(53, 227, 212, .18) 62%, var(--yx-orange) 100%);
}

.about-tl__item {
  position: relative;
  padding: 0 0 clamp(26px, 4vw, 42px) 40px;
}

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

.about-tl__item::before {
  content: "";
  position: absolute;
  left: 3px;
  top: 7px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--yx-night);
  border: 3px solid var(--yx-cyan);
}

.about-tl__item:last-child::before {
  border-color: var(--yx-orange);
  box-shadow: 0 0 0 5px rgba(255, 122, 41, .16);
}

.about-tl__mark {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 8px;
}

.about-tl__year {
  font-family: var(--yx-font-mono);
  font-size: 14px;
  letter-spacing: .06em;
  color: var(--yx-cyan);
  font-variant-numeric: tabular-nums;
}

.about-tl__ver {
  padding: 3px 11px;
  border-radius: var(--yx-pill);
  background: var(--yx-cyan-soft);
  font-size: 12.5px;
  color: var(--yx-cyan);
}

.about-tl__item:last-child .about-tl__ver {
  background: rgba(255, 122, 41, .16);
  color: var(--yx-orange);
}

.about-tl__body h3 {
  font-size: clamp(18px, 2.4vw, 23px);
  margin-bottom: 8px;
  color: var(--yx-cream);
}

.about-tl__body p {
  max-width: 64ch;
  font-size: 15px;
  color: var(--about-soft-text);
}

/* ---------- 服务 ---------- */

.about-service__grid {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
  align-items: start;
}

.about-service__text p {
  max-width: 66ch;
  color: var(--about-ink-text);
}

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

.about-service__note {
  padding: clamp(20px, 3vw, 30px);
  border: 1px solid rgba(11, 27, 51, .12);
  border-radius: var(--yx-r-lg);
  background: var(--yx-white);
}

.about-service__note h3 {
  font-size: 17px;
  margin-bottom: 16px;
  color: var(--yx-deep);
}

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

.about-service__note li {
  position: relative;
  padding-left: 20px;
  font-size: 14.5px;
  color: var(--about-ink-text);
}

.about-service__note li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--yx-moss);
}

/* ---------- 生态 ---------- */

.about-eco__grid {
  display: grid;
  gap: 18px;
}

.about-eco__card {
  padding: clamp(20px, 3vw, 30px);
  border-top: 3px solid var(--yx-cyan);
  border-radius: 0 0 var(--yx-r-md) var(--yx-r-md);
  background: rgba(20, 41, 74, .72);
}

.about-eco__card:nth-child(2) {
  border-top-color: var(--yx-clay);
}

.about-eco__card h3 {
  font-size: 18px;
  margin-bottom: 10px;
  color: var(--yx-cream);
}

.about-eco__card p {
  font-size: 14.8px;
  color: var(--about-soft-text);
}

.about-eco__cta {
  margin-top: clamp(24px, 3.6vw, 36px);
}

/* ---------- 下一步 ---------- */

.about-next {
  padding: var(--about-section-y) 0;
  background: linear-gradient(180deg, var(--yx-deep), var(--yx-night));
  border-top: 1px solid var(--yx-line-soft);
}

.about-next h2 {
  font-size: clamp(22px, 3.2vw, 34px);
  margin-top: 10px;
}

.about-next__list {
  list-style: none;
  margin: clamp(24px, 3.6vw, 38px) 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.about-next__link {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 20px 22px;
  border: 1px solid var(--yx-line);
  border-radius: var(--yx-r-md);
  background: rgba(20, 41, 74, .42);
  color: var(--yx-read);
  transition: transform .25s ease, border-color .25s ease, background .25s ease;
}

.about-next__link:hover {
  transform: translateY(-2px);
  border-color: rgba(53, 227, 212, .5);
  background: rgba(20, 41, 74, .82);
  text-decoration: none;
}

.about-next__link strong {
  font-family: var(--yx-font-display);
  font-size: 17px;
  font-weight: 800;
  letter-spacing: -.01em;
}

.about-next__link span {
  font-size: 13.5px;
  color: var(--yx-slate);
}

/* ---------- 响应式 ---------- */

@media (min-width: 720px) {
  .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

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

@media (min-width: 900px) {
  .page-about {
    font-size: 17px;
  }

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

  .about-origin__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }

  .about-data__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  }

  .about-service__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }
}

@media (min-width: 1000px) {
  .about-team__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition: none !important;
  }
}