.page-about {
  --about-axis: 2px;
  --about-deep: rgba(69, 179, 162, .22);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: clamp(28px, 5vw, 64px) 0 clamp(32px, 5vw, 56px);
  background: linear-gradient(180deg, var(--paper-000) 0%, var(--mist-050) 100%);
  border-bottom: 1px solid var(--line-200);
}

.page-about .about-hero .breadcrumb {
  margin-bottom: clamp(20px, 3vw, 36px);
  font-size: var(--fs-14);
}

.page-about .about-hero .eyebrow {
  color: var(--jade-600);
  margin: 0 0 14px;
}

.page-about .about-hero h1 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(30px, 5.4vw, 60px);
  line-height: 1.16;
  letter-spacing: -.01em;
  color: var(--ink-900);
  margin: 0 0 20px;
  max-width: 20em;
}

.page-about .about-hero .lede {
  max-width: 36em;
  font-size: var(--fs-18);
  line-height: 1.85;
  color: var(--ink-700);
  margin: 0 0 clamp(28px, 4vw, 44px);
}

.page-about .about-figures {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  background: var(--line-200);
  border: 1px solid var(--line-200);
  border-radius: var(--radius-m);
  overflow: hidden;
}

.page-about .about-figures__item {
  background: var(--paper-000);
  padding: 16px 18px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-width: 0;
}

.page-about .about-figures__item dt {
  font-size: var(--fs-12);
  letter-spacing: .08em;
  color: var(--gray-500);
}

.page-about .about-figures__item dd {
  margin: 0;
  font-size: var(--fs-16);
  color: var(--ink-700);
  display: flex;
  align-items: baseline;
  gap: 6px;
}

.page-about .about-figures__item dd .mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(24px, 3.6vw, 32px);
  font-weight: 700;
  line-height: 1;
  color: var(--gold-500);
  letter-spacing: -.02em;
}

/* ---------- 品牌记忆点 ---------- */
.page-about .about-origin {
  background: var(--paper-000);
}

.page-about .about-origin__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 48px);
  align-items: start;
}

.page-about .about-origin__rail .eyebrow {
  color: var(--jade-600);
  margin: 0 0 12px;
}

.page-about .about-origin__rail h2 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(24px, 3.6vw, 40px);
  line-height: 1.28;
  color: var(--ink-900);
  margin: 0 0 18px;
}

.page-about .about-origin__rail .rule {
  height: 3px;
  width: 56px;
  background: var(--jade-600);
  border: 0;
  border-radius: 2px;
  margin: 0;
}

.page-about .about-origin__body {
  font-size: var(--fs-16);
  line-height: 1.9;
  color: var(--ink-700);
}

.page-about .about-origin__body p {
  margin: 0 0 1.15em;
}

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

.page-about .about-origin__quote {
  margin: 1.6em 0;
  padding: 20px 22px;
  background: var(--mist-050);
  border-left: 3px solid var(--jade-600);
  border-radius: 0 var(--radius-s) var(--radius-s) 0;
  font-size: var(--fs-16);
  line-height: 1.85;
  color: var(--ink-900);
}

/* ---------- 版本时间轴 ---------- */
.page-about .about-track {
  background: var(--ink-900);
  color: var(--paper-000);
  padding-block: clamp(48px, 9vw, 104px);
  overflow: hidden;
}

.page-about .about-track__head {
  margin-bottom: clamp(28px, 4vw, 44px);
}

.page-about .about-track__head .eyebrow {
  color: var(--jade-400);
  margin: 0 0 14px;
}

.page-about .about-track__head h2 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(26px, 4.2vw, 48px);
  line-height: 1.2;
  color: var(--paper-000);
  margin: 0 0 16px;
}

.page-about .about-track__head .lede {
  max-width: 34em;
  font-size: var(--fs-18);
  line-height: 1.8;
  color: rgba(251, 249, 245, .76);
  margin: 0;
}

.page-about .about-track__media {
  margin: 0 0 clamp(32px, 5vw, 56px);
  border-radius: var(--radius-m);
  overflow: hidden;
  border: 1px solid rgba(215, 221, 226, .18);
}

.page-about .about-track__media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 14 / 9;
  object-fit: cover;
  filter: saturate(.82) contrast(.95);
}

.page-about .about-timeline {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 4px 0 4px 32px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 10px;
  bottom: 10px;
  width: var(--about-axis);
  border-radius: 2px;
  background: linear-gradient(180deg, var(--jade-400) 0%, var(--gold-500) 58%, var(--orange-500) 100%);
  opacity: .72;
}

.page-about .about-timeline__item {
  position: relative;
  padding-bottom: clamp(22px, 3.4vw, 36px);
}

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

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -32px;
  top: 10px;
  width: 16px;
  height: 16px;
  box-sizing: border-box;
  border-radius: 50%;
  background: var(--ink-900);
  border: 2px solid var(--gold-500);
  box-shadow: 0 0 0 4px rgba(199, 154, 59, .14);
}

.page-about .about-timeline__card {
  position: relative;
  background: var(--ink-700);
  border: 1px solid var(--about-deep);
  border-radius: var(--radius-m);
  padding: 20px 22px 18px;
  box-shadow: 0 10px 28px rgba(0, 0, 0, .28);
}

.page-about .about-timeline__card::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 18px;
  height: 18px;
  border-top-right-radius: var(--radius-m);
  background: linear-gradient(225deg, rgba(69, 179, 162, .45) 0 50%, transparent 50%);
  pointer-events: none;
}

.page-about .about-timeline__version {
  display: inline-block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(22px, 3.4vw, 32px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--gold-500);
  margin-bottom: 12px;
}

.page-about .about-timeline__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--fs-18);
  line-height: 1.45;
  color: var(--paper-000);
  margin: 0 0 10px;
}

.page-about .about-timeline__text {
  font-size: var(--fs-16);
  line-height: 1.85;
  color: rgba(251, 249, 245, .82);
  margin: 0 0 14px;
}

.page-about .about-timeline__toggle {
  appearance: none;
  border: 1px solid rgba(69, 179, 162, .42);
  background: rgba(69, 179, 162, .1);
  color: var(--jade-400);
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: .06em;
  padding: 6px 12px;
  border-radius: 999px;
  cursor: pointer;
  transition: background 180ms var(--ease), color 180ms var(--ease), transform 180ms var(--ease);
}

.page-about .about-timeline__toggle:hover,
.page-about .about-timeline__toggle:focus-visible {
  background: rgba(69, 179, 162, .2);
  color: var(--paper-000);
  transform: translateY(-1px);
}

.page-about .about-timeline__toggle[aria-expanded="true"] {
  background: var(--jade-600);
  border-color: var(--jade-600);
  color: var(--paper-000);
}

.page-about .about-timeline__note {
  margin: 14px 0 0;
  padding: 12px 14px;
  border-radius: var(--radius-s);
  background: rgba(11, 27, 43, .55);
  border-left: 2px solid var(--gold-500);
  font-size: var(--fs-14);
  line-height: 1.8;
  color: rgba(251, 249, 245, .74);
}

.page-about .about-timeline__note[hidden] {
  display: none;
}

/* ---------- 人群画像 ---------- */
.page-about .about-audience {
  background: var(--mist-050);
  padding-block: clamp(48px, 8vw, 96px);
}

.page-about .about-audience__head {
  margin-bottom: clamp(22px, 3.5vw, 36px);
}

.page-about .about-audience__head .eyebrow {
  color: var(--jade-600);
  margin: 0 0 14px;
}

.page-about .about-audience__head h2 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(25px, 3.8vw, 44px);
  line-height: 1.24;
  color: var(--ink-900);
  margin: 0 0 16px;
}

.page-about .about-audience__head .lede {
  max-width: 34em;
  font-size: var(--fs-18);
  line-height: 1.8;
  color: var(--ink-700);
  margin: 0;
}

.page-about .about-audience__media {
  margin: 0 0 clamp(24px, 3.6vw, 38px);
  border-radius: var(--radius-m);
  overflow: hidden;
  border: 1px solid rgba(15, 122, 108, .16);
}

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

.page-about .about-audience__rail {
  list-style: none;
  margin: 0;
  padding: 4px 0 18px;
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(250px, 82%);
  gap: 16px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}

.page-about .about-audience__rail > li {
  scroll-snap-align: start;
  display: flex;
  min-width: 0;
}

.page-about .about-audience__card {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 12px;
  background: var(--paper-000);
  border: 1px solid var(--line-200);
  border-radius: var(--radius-m);
  padding: 22px 22px 24px;
  box-shadow: var(--shadow-s);
}

.page-about .about-audience__tag {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: .07em;
  color: var(--jade-600);
}

.page-about .about-audience__card h3 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--fs-24);
  line-height: 1.36;
  color: var(--ink-900);
  margin: 0;
}

.page-about .about-audience__card p {
  margin: 0;
  font-size: var(--fs-16);
  line-height: 1.8;
  color: var(--ink-700);
}

.page-about .about-audience__diff {
  margin-top: auto;
  padding-top: 14px;
  border-top: 1px dashed var(--line-200);
  font-size: var(--fs-14);
  line-height: 1.75;
  color: var(--gray-500);
}

/* ---------- 服务范围 ---------- */
.page-about .about-scope {
  background: var(--paper-000);
  padding-block: clamp(48px, 8vw, 96px);
}

.page-about .about-scope__head {
  margin-bottom: clamp(24px, 3.6vw, 40px);
}

.page-about .about-scope__head .eyebrow {
  color: var(--jade-600);
  margin: 0 0 14px;
}

.page-about .about-scope__head h2 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(25px, 3.8vw, 44px);
  line-height: 1.24;
  color: var(--ink-900);
  margin: 0 0 16px;
}

.page-about .about-scope__head .lede {
  max-width: 34em;
  font-size: var(--fs-18);
  line-height: 1.8;
  color: var(--ink-700);
  margin: 0;
}

.page-about .about-scope__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
}

.page-about .about-scope__block {
  position: relative;
  background: var(--paper-000);
  border: 1px solid var(--line-200);
  border-radius: var(--radius-m);
  padding: clamp(20px, 3vw, 32px);
  min-width: 0;
}

.page-about .about-scope__block--query {
  border-top: 3px solid var(--jade-600);
}

.page-about .about-scope__block--compare {
  border-top: 3px solid var(--gold-500);
}

.page-about .about-scope__block h3 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--fs-24);
  line-height: 1.3;
  color: var(--ink-900);
  margin: 0 0 10px;
}

.page-about .about-scope__intro {
  margin: 0 0 18px;
  font-size: var(--fs-14);
  line-height: 1.75;
  color: var(--gray-500);
}

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

.page-about .about-scope__list li {
  position: relative;
  padding-left: 24px;
  font-size: var(--fs-16);
  line-height: 1.78;
  color: var(--ink-700);
}

.page-about .about-scope__list li::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 10px;
  width: 8px;
  height: 8px;
  border-radius: 2px;
  background: var(--jade-400);
}

.page-about .about-scope__block--compare .about-scope__list li::before {
  background: var(--gold-500);
}

.page-about .about-scope__note {
  margin-top: clamp(20px, 3vw, 32px);
  padding: 20px 22px;
  background: var(--gold-100);
  border-left: 3px solid var(--gold-500);
  border-radius: 0 var(--radius-s) var(--radius-s) 0;
  font-size: var(--fs-16);
  line-height: 1.85;
  color: var(--ink-700);
}

.page-about .about-scope__note p {
  margin: 0;
}

/* ---------- 团队与维护 ---------- */
.page-about .about-team {
  background: var(--paper-000);
  border-top: 1px solid var(--line-200);
  padding-block: clamp(48px, 8vw, 96px);
}

.page-about .about-team__head {
  margin-bottom: clamp(24px, 3.6vw, 40px);
}

.page-about .about-team__head .eyebrow {
  color: var(--jade-600);
  margin: 0 0 14px;
}

.page-about .about-team__head h2 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(25px, 3.8vw, 44px);
  line-height: 1.24;
  color: var(--ink-900);
  margin: 0 0 16px;
}

.page-about .about-team__head .lede {
  max-width: 34em;
  font-size: var(--fs-18);
  line-height: 1.8;
  color: var(--ink-700);
  margin: 0;
}

.page-about .about-team__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line-200);
  border: 1px solid var(--line-200);
  border-radius: var(--radius-m);
  overflow: hidden;
}

.page-about .about-team__block {
  background: var(--paper-000);
  padding: clamp(20px, 3vw, 30px);
  min-width: 0;
}

.page-about .about-team__num {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(38px, 6vw, 60px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--jade-600);
  margin-bottom: 14px;
}

.page-about .about-team__block h3 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--fs-18);
  line-height: 1.4;
  color: var(--ink-900);
  margin: 0 0 8px;
}

.page-about .about-team__block p {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.8;
  color: var(--gray-500);
}

.page-about .about-team__rhythm {
  margin-top: clamp(24px, 4vw, 40px);
}

.page-about .about-team__rhythm h3 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--fs-24);
  color: var(--ink-900);
  margin: 0 0 14px;
}

.page-about .about-team__rhythm ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line-200);
  border-top: 1px solid var(--line-200);
  border-bottom: 1px solid var(--line-200);
}

.page-about .about-team__rhythm li {
  background: var(--paper-000);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 4px;
  padding: 14px 4px;
  font-size: var(--fs-16);
  line-height: 1.75;
  color: var(--ink-700);
}

.page-about .about-team__rhythm-key {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--fs-14);
  letter-spacing: .04em;
  color: var(--gold-500);
}

/* ---------- 地域 ---------- */
.page-about .about-region {
  background: var(--mist-050);
  padding-block: clamp(48px, 8vw, 96px);
}

.page-about .about-region__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 48px);
  align-items: center;
}

.page-about .about-region__media {
  margin: 0;
  border-radius: var(--radius-m);
  overflow: hidden;
  border: 1px solid rgba(15, 122, 108, .16);
  background: var(--paper-000);
}

.page-about .about-region__media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 10 / 7;
  object-fit: cover;
}

.page-about .about-region__body .eyebrow {
  color: var(--jade-600);
  margin: 0 0 12px;
}

.page-about .about-region__body h2 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(24px, 3.6vw, 40px);
  line-height: 1.26;
  color: var(--ink-900);
  margin: 0 0 18px;
}

.page-about .about-region__body p {
  margin: 0 0 1.1em;
  font-size: var(--fs-16);
  line-height: 1.85;
  color: var(--ink-700);
}

.page-about .about-region__cta {
  margin: 22px 0 0;
}

/* ---------- 延伸入口 ---------- */
.page-about .about-next {
  background: var(--paper-000);
  border-top: 1px solid var(--line-200);
}

.page-about .about-next h2 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(21px, 3vw, 30px);
  line-height: 1.3;
  color: var(--ink-900);
  margin: 0 0 18px;
}

.page-about .about-next__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line-200);
  border-top: 1px solid var(--line-200);
  border-bottom: 1px solid var(--line-200);
}

.page-about .about-next__list li {
  background: var(--paper-000);
}

.page-about .about-next__list a {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 18px;
  padding: 16px 4px;
  text-decoration: none;
  color: var(--ink-900);
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--fs-18);
  transition: color 180ms var(--ease), padding-left 180ms var(--ease);
}

.page-about .about-next__list a:hover,
.page-about .about-next__list a:focus-visible {
  color: var(--jade-600);
  padding-left: 10px;
}

.page-about .about-next__hint {
  font-family: var(--font-body);
  font-weight: 400;
  font-size: var(--fs-14);
  line-height: 1.7;
  color: var(--gray-500);
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-figures {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-figures__item dd {
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
  }

  .page-about .about-team__rhythm li {
    grid-template-columns: 150px minmax(0, 1fr);
    gap: 16px;
    align-items: baseline;
    padding: 16px 4px;
  }
}

@media (min-width: 860px) {
  .page-about .about-origin__grid {
    grid-template-columns: minmax(0, 4fr) minmax(0, 7fr);
    gap: clamp(32px, 5vw, 64px);
  }

  .page-about .about-scope__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 24px;
  }

  .page-about .about-region__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
  }
}

@media (min-width: 960px) {
  .page-about .about-audience__rail {
    grid-auto-flow: row;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    grid-auto-columns: auto;
    overflow: visible;
    padding-bottom: 0;
  }

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

@media (max-width: 520px) {
  .page-about .about-audience__rail {
    grid-auto-columns: minmax(230px, 86%);
  }

  .page-about .about-timeline {
    padding-left: 26px;
  }

  .page-about .about-timeline::before {
    left: 6px;
  }

  .page-about .about-timeline__item::before {
    left: -26px;
    width: 14px;
    height: 14px;
  }

  .page-about .about-next__list a {
    font-size: var(--fs-16);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-timeline__toggle,
  .page-about .about-next__list a {
    transition: none;
  }

  .page-about .about-timeline__toggle:hover,
  .page-about .about-timeline__toggle:focus-visible {
    transform: none;
  }
}