.page-about {
  --about-shadow: 6px 6px 0 rgba(10, 26, 43, 0.10);
  --about-shadow-dark: 6px 6px 0 rgba(0, 0, 0, 0.38);
  --about-hairline: rgba(168, 242, 231, 0.22);
  background: var(--paper);
  color: var(--graphite);
  overflow-x: hidden;
}

/* ============ 首屏 ============ */
.page-about .about-hero {
  position: relative;
  padding: clamp(24px, 5vw, 52px) 0 clamp(44px, 8vw, 92px);
  background:
    radial-gradient(95% 72% at 88% 6%, rgba(79, 227, 208, 0.22), transparent 62%),
    radial-gradient(70% 58% at 4% 98%, rgba(233, 181, 74, 0.12), transparent 62%),
    var(--ink-900);
  color: var(--frost);
}

.page-about .about-hero__crumb {
  color: rgba(251, 253, 252, 0.62);
  margin-bottom: clamp(28px, 5vw, 52px);
}

.page-about .about-hero__crumb a {
  color: var(--aurora-soft);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--t-fast) var(--ease);
}

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

.page-about .about-hero__sep {
  margin: 0 0.5em;
  opacity: 0.5;
}

.page-about .breadcrumb {
  font-size: var(--fs-14);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 5vw, 48px);
}

.page-about .about-hero__kicker {
  font-size: var(--fs-14);
  letter-spacing: 0.08em;
  color: var(--gold);
  margin: 0 0 clamp(14px, 2vw, 22px);
  text-transform: none;
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2.1rem, 7.2vw, 4.1rem);
  line-height: 1.12;
  letter-spacing: 0.01em;
  margin: 0 0 clamp(18px, 3vw, 28px);
  color: var(--frost);
  max-width: 16em;
}

.page-about .about-hero__text {
  font-size: var(--fs-16);
  line-height: 1.8;
  color: rgba(251, 253, 252, 0.82);
  margin: 0 0 1em;
  max-width: 46em;
}

.page-about .about-hero__text:last-of-type {
  margin-bottom: 0;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3.5vw, 34px);
}

.page-about .about-hero__visual {
  margin: 0;
  border: var(--border-w) solid var(--about-hairline);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--ink-800);
  box-shadow: var(--about-shadow-dark);
}

.page-about .about-hero__visual img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  aspect-ratio: 16 / 10;
}

.page-about .figure__tag {
  display: inline-block;
  padding: 2px 8px;
  margin-right: 10px;
  border-radius: var(--radius-sm);
  background: var(--aurora);
  color: var(--ink-900);
  font-size: var(--fs-12);
  letter-spacing: 0.06em;
  font-weight: 600;
}

.page-about .about-hero__visual .figure__caption {
  padding: 12px 16px;
  font-size: var(--fs-14);
  color: rgba(251, 253, 252, 0.72);
  border-top: var(--border-w) solid var(--about-hairline);
  background: rgba(6, 16, 25, 0.45);
}

.page-about .about-hero__facts {
  list-style: none;
  margin: clamp(36px, 6vw, 64px) 0 0;
  padding: clamp(20px, 3vw, 28px) 0 0;
  border-top: 1px solid rgba(168, 242, 231, 0.24);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(18px, 3vw, 30px);
}

.page-about .about-fact {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .about-fact__num {
  font-size: clamp(1.5rem, 4.4vw, 2.1rem);
  line-height: 1;
  color: var(--aurora);
  letter-spacing: 0.02em;
}

.page-about .about-fact__label {
  font-size: var(--fs-14);
  color: rgba(251, 253, 252, 0.68);
  line-height: 1.5;
}

/* ============ 品牌主张 ============ */
.page-about .about-why {
  padding: clamp(48px, 8vw, 96px) 0;
  background: var(--paper);
}

.page-about .about-why__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 44px);
}

.page-about .about-why__head h2 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.6rem, 4.6vw, 2.6rem);
  line-height: 1.2;
  margin: 0.4em 0 0;
  color: var(--graphite);
  max-width: 14em;
}

.page-about .about-why__body {
  columns: 1;
}

.page-about .about-why__body p {
  font-size: var(--fs-16);
  line-height: 1.85;
  color: var(--graphite);
  margin: 0 0 1em;
}

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

/* ============ 时间轴 ============ */
.page-about .about-line {
  position: relative;
  padding: clamp(48px, 8vw, 96px) 0 clamp(52px, 9vw, 104px);
  background:
    radial-gradient(80% 50% at 100% 0%, rgba(79, 227, 208, 0.14), transparent 62%),
    var(--ink-950);
  color: var(--frost);
}

.page-about .about-line__head h2 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.6rem, 4.6vw, 2.6rem);
  line-height: 1.2;
  margin: 0.4em 0 0;
  color: var(--frost);
  max-width: 14em;
}

.page-about .about-line__intro {
  font-size: var(--fs-16);
  line-height: 1.8;
  color: rgba(251, 253, 252, 0.72);
  margin: 14px 0 0;
  max-width: 42em;
}

.page-about .about-line__jump {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: clamp(24px, 4vw, 36px) 0 0;
  padding: 0;
}

.page-about .about-line__jump-link {
  display: inline-block;
  padding: 7px 14px;
  font-size: var(--fs-12);
  letter-spacing: 0.04em;
  color: var(--aurora-soft);
  text-decoration: none;
  border: var(--border-w) solid var(--about-hairline);
  border-radius: 999px;
  transition: background var(--t-fast) var(--ease), color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease);
}

.page-about .about-line__jump-link:hover,
.page-about .about-line__jump-link:focus-visible {
  background: var(--aurora);
  border-color: var(--aurora);
  color: var(--ink-900);
}

.page-about .about-line__figure {
  margin: clamp(28px, 5vw, 48px) 0 0;
  border: var(--border-w) solid var(--about-hairline);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--ink-800);
}

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

.page-about .about-line__figure .figure__caption {
  padding: 12px 16px;
  font-size: var(--fs-14);
  color: rgba(251, 253, 252, 0.7);
  border-top: var(--border-w) solid var(--about-hairline);
}

.page-about .about-line__list {
  list-style: none;
  margin: clamp(36px, 6vw, 60px) 0 0;
  padding: 0;
  position: relative;
  display: grid;
  gap: clamp(28px, 5vw, 44px);
}

.page-about .about-line__list::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 6px;
  bottom: 6px;
  width: 2px;
  background: linear-gradient(180deg, var(--aurora), rgba(79, 227, 208, 0.12));
}

.page-about .about-line__item {
  position: relative;
  padding-left: 36px;
  display: grid;
  gap: 10px;
  scroll-margin-top: 110px;
}

.page-about .about-line__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 16px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--aurora);
  box-shadow: 0 0 0 4px rgba(79, 227, 208, 0.18);
  z-index: 1;
}

.page-about .about-line__year {
  font-size: clamp(2.4rem, 11vw, 3.4rem);
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--gold);
}

.page-about .about-line__card {
  border: var(--border-w) solid var(--about-hairline);
  border-left: 3px solid var(--aurora);
  border-radius: var(--radius);
  background: rgba(14, 34, 55, 0.72);
  padding: 16px 18px;
  box-shadow: var(--about-shadow-dark);
}

.page-about .about-line__summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  gap: 6px;
  position: relative;
  padding-right: 30px;
}

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

.page-about .about-line__summary::after {
  content: "+";
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  font-size: var(--fs-22);
  line-height: 1;
  color: var(--aurora);
  transition: transform var(--t-fast) var(--ease);
}

.page-about .about-line__card[open] .about-line__summary::after {
  content: "–";
}

.page-about .about-line__eyebrow {
  font-size: var(--fs-12);
  letter-spacing: 0.12em;
  color: var(--gold);
}

.page-about .about-line__head-text {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--fs-18);
  line-height: 1.45;
  color: var(--frost);
}

.page-about .about-line__detail {
  padding-top: 12px;
  margin-top: 12px;
  border-top: 1px solid rgba(168, 242, 231, 0.16);
}

.page-about .about-line__detail p {
  margin: 0;
  font-size: var(--fs-16);
  line-height: 1.8;
  color: rgba(251, 253, 252, 0.76);
}

/* ============ 内容来源 ============ */
.page-about .about-source {
  padding: clamp(48px, 8vw, 96px) 0;
  background: var(--paper);
}

.page-about .about-source__head h2,
.page-about .about-team__head h2,
.page-about .about-design__head h2,
.page-about .about-region__copy h2 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.6rem, 4.6vw, 2.6rem);
  line-height: 1.2;
  margin: 0.4em 0 0;
  color: var(--graphite);
  max-width: 14em;
}

.page-about .about-source__intro,
.page-about .about-team__intro,
.page-about .about-design__intro {
  font-size: var(--fs-16);
  line-height: 1.8;
  color: #3d4a58;
  margin: 14px 0 0;
  max-width: 44em;
}

.page-about .about-source__grid {
  margin-top: clamp(30px, 5vw, 52px);
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 40px);
}

.page-about .about-source__flow {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
  counter-reset: none;
}

.page-about .about-source__step {
  position: relative;
  padding: 18px 20px 18px 62px;
  border: var(--border-w) solid var(--paper-line);
  border-radius: var(--radius);
  background: var(--frost);
  box-shadow: var(--about-shadow);
}

.page-about .about-source__idx {
  position: absolute;
  left: 18px;
  top: 20px;
  font-size: var(--fs-14);
  color: var(--maple);
  letter-spacing: 0.04em;
}

.page-about .about-source__step h3 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--fs-18);
  line-height: 1.4;
  margin: 0 0 6px;
  color: var(--graphite);
}

.page-about .about-source__step p {
  margin: 0;
  font-size: var(--fs-16);
  line-height: 1.75;
  color: #3d4a58;
}

.page-about .about-source__note {
  border: var(--border-w) solid var(--ink-900);
  border-radius: var(--radius);
  background: var(--ink-900);
  color: var(--frost);
  padding: clamp(22px, 3.4vw, 32px);
  box-shadow: var(--about-shadow);
}

.page-about .about-source__note-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--fs-22);
  line-height: 1.35;
  margin: 0 0 14px;
  color: var(--aurora);
}

.page-about .about-source__note p {
  margin: 0 0 1em;
  font-size: var(--fs-16);
  line-height: 1.8;
  color: rgba(251, 253, 252, 0.82);
}

.page-about .about-source__note .btn {
  margin-top: 8px;
}

/* ============ 团队 ============ */
.page-about .about-team {
  padding: clamp(48px, 8vw, 96px) 0;
  background: var(--paper);
  border-top: 1px solid var(--paper-line);
}

.page-about .about-team__grid {
  margin-top: clamp(30px, 5vw, 52px);
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(18px, 3vw, 26px);
}

.page-about .about-team__card {
  border: var(--border-w) solid var(--ink-900);
  border-radius: var(--radius);
  background: var(--frost);
  padding: clamp(20px, 3vw, 28px);
  box-shadow: var(--about-shadow);
}

.page-about .about-team__tag {
  display: inline-block;
  padding: 3px 10px;
  font-size: var(--fs-12);
  letter-spacing: 0.08em;
  color: var(--ink-900);
  background: var(--gold);
  border-radius: var(--radius-sm);
}

.page-about .about-team__card h3 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--fs-22);
  line-height: 1.35;
  margin: 14px 0 10px;
  color: var(--graphite);
}

.page-about .about-team__card p {
  margin: 0;
  font-size: var(--fs-16);
  line-height: 1.78;
  color: #3d4a58;
}

.page-about .about-team__figure {
  margin: clamp(30px, 5vw, 52px) 0 0;
  border: var(--border-w) solid var(--paper-line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--ink-900);
}

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

.page-about .about-team__figure .figure__caption {
  padding: 12px 16px;
  font-size: var(--fs-14);
  color: rgba(251, 253, 252, 0.74);
  background: var(--ink-900);
  border-top: var(--border-w) solid rgba(168, 242, 231, 0.22);
}

/* ============ 设计原则 ============ */
.page-about .about-design {
  padding: clamp(48px, 8vw, 96px) 0;
  background:
    radial-gradient(80% 60% at 0% 100%, rgba(233, 181, 74, 0.14), transparent 60%),
    var(--ink-900);
  color: var(--frost);
}

.page-about .about-design__head h2 {
  color: var(--frost);
}

.page-about .about-design__intro {
  color: rgba(251, 253, 252, 0.72);
}

.page-about .about-design__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 5vw, 48px);
}

.page-about .about-design__list {
  margin: 0;
  display: grid;
  gap: 0;
  border-top: var(--border-w) solid var(--about-hairline);
}

.page-about .about-design__row {
  padding: clamp(18px, 3vw, 24px) 0;
  border-bottom: var(--border-w) solid var(--about-hairline);
}

.page-about .about-design__row dt {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--fs-18);
  line-height: 1.45;
  color: var(--aurora-soft);
  margin-bottom: 8px;
}

.page-about .about-design__row dd {
  margin: 0;
  font-size: var(--fs-16);
  line-height: 1.78;
  color: rgba(251, 253, 252, 0.74);
}

/* ============ 服务地区与备案 ============ */
.page-about .about-region {
  padding: clamp(48px, 8vw, 96px) 0 clamp(56px, 9vw, 104px);
  background: var(--paper);
}

.page-about .about-region__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 5vw, 48px);
}

.page-about .about-region__copy p {
  font-size: var(--fs-16);
  line-height: 1.85;
  color: #3d4a58;
  margin: 14px 0 0;
  max-width: 42em;
}

.page-about .about-region__copy .btn {
  margin-top: 22px;
}

.page-about .about-region__data {
  margin: 0;
  border: var(--border-w) solid var(--paper-line);
  border-radius: var(--radius);
  background: var(--frost);
  overflow: hidden;
  box-shadow: var(--about-shadow);
}

.page-about .about-region__item {
  display: grid;
  grid-template-columns: 1fr;
  gap: 4px;
  padding: 14px 18px;
  border-bottom: 1px solid var(--paper-line);
}

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

.page-about .about-region__item dt {
  font-size: var(--fs-12);
  letter-spacing: 0.08em;
  color: var(--slate);
}

.page-about .about-region__item dd {
  margin: 0;
  font-size: var(--fs-16);
  line-height: 1.7;
  color: var(--graphite);
  word-break: break-word;
}

.page-about .about-region__item dd.mono {
  font-size: var(--fs-14);
  color: var(--ink-700);
}

.page-about .about-region__data .copy-line {
  display: inline-flex;
  align-items: center;
}

.page-about .about-region__data .copy-line__val {
  border-bottom: 1px solid var(--gold);
  padding-bottom: 1px;
}

/* ============ 响应式 ============ */
@media (min-width: 600px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-about .about-region__item {
    grid-template-columns: minmax(0, 190px) minmax(0, 1fr);
    gap: 14px;
    align-items: baseline;
  }
}

@media (min-width: 780px) {
  .page-about .about-why__body {
    columns: 2;
    column-gap: clamp(28px, 4vw, 52px);
  }

  .page-about .about-source__grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    align-items: start;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 0.8fr);
    gap: clamp(32px, 5vw, 64px);
    align-items: start;
  }

  .page-about .about-hero__visual {
    margin-top: clamp(20px, 3vw, 48px);
  }

  .page-about .about-why__grid {
    grid-template-columns: minmax(0, 0.78fr) minmax(0, 1.22fr);
    gap: clamp(32px, 5vw, 72px);
    align-items: start;
  }

  .page-about .about-why__head {
    position: sticky;
    top: 96px;
  }

  .page-about .about-line__list {
    gap: clamp(38px, 6vw, 64px);
  }

  .page-about .about-line__list::before {
    left: 50%;
    margin-left: -1px;
    top: 10px;
    bottom: 10px;
  }

  .page-about .about-line__item {
    padding-left: 0;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: clamp(40px, 6vw, 84px);
    align-items: center;
  }

  .page-about .about-line__item::before {
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
  }

  .page-about .about-line__item:nth-child(even) .about-line__year {
    order: 2;
    text-align: left;
  }

  .page-about .about-line__item:nth-child(even) .about-line__card {
    order: 1;
  }

  .page-about .about-line__item:nth-child(odd) .about-line__year {
    order: 1;
    text-align: right;
  }

  .page-about .about-line__item:nth-child(odd) .about-line__card {
    order: 2;
  }

  .page-about .about-line__year {
    font-size: clamp(3.6rem, 6.6vw, 6rem);
  }

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

  .page-about .about-team__grid .about-team__card:nth-child(2) {
    margin-top: clamp(14px, 2vw, 24px);
  }

  .page-about .about-design__grid {
    grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr);
    gap: clamp(36px, 6vw, 80px);
    align-items: start;
  }

  .page-about .about-region__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: clamp(36px, 6vw, 72px);
    align-items: start;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-line__summary::after {
    transition: none;
  }
}
</PAGE_CSS>>>