/* ===== page-about : 品牌文化 ===== */

.page-about {
  --about-rail: 132px;
  --about-rail-cat: 190px;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(28px, 6vw, 56px) clamp(36px, 7vw, 72px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -22%;
  right: -14%;
  width: min(640px, 82vw);
  height: min(640px, 82vw);
  background: radial-gradient(circle at 50% 50%, rgba(127, 233, 255, 0.14), rgba(127, 233, 255, 0) 68%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: linear-gradient(90deg, rgba(127, 233, 255, 0), rgba(127, 233, 255, 0.42), rgba(255, 199, 102, 0));
}

.page-about .about-hero > .shell {
  position: relative;
  z-index: 1;
}

.page-about .about-hero .breadcrumb {
  margin-bottom: clamp(22px, 4vw, 36px);
}

.page-about .hero-grid {
  display: grid;
  gap: clamp(26px, 5vw, 44px);
}

.page-about .hero-copy h1 {
  margin: 0 0 20px;
  font-weight: 900;
  font-size: clamp(30px, 6.6vw, 56px);
  line-height: 1.14;
  letter-spacing: -0.02em;
  max-width: 15em;
}

.page-about .hero-copy .hero-lead {
  margin: 0 0 16px;
  font-size: clamp(17px, 2.1vw, 19px);
  line-height: 1.85;
  color: var(--soft);
  max-width: 36em;
}

.page-about .hero-copy p {
  margin: 0;
  color: var(--faint);
  font-size: 17px;
  line-height: 1.85;
  max-width: 36em;
}

@media (min-width: 960px) {
  .page-about .hero-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: clamp(32px, 5vw, 76px);
    align-items: start;
  }
}

.page-about .facts {
  padding: clamp(18px, 3vw, 26px) clamp(18px, 3vw, 28px);
}

.page-about .facts__title {
  margin: 0 0 10px;
  font-family: var(--mono);
  font-size: 12.5px;
  letter-spacing: 0.16em;
  color: var(--muted);
}

.page-about .fact {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding-block: 12px;
  border-bottom: 1px dashed var(--hairline);
}

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

.page-about .fact__num {
  font-family: var(--mono);
  font-size: clamp(17px, 2.6vw, 21px);
  color: var(--cyan);
  letter-spacing: 0.04em;
}

.page-about .fact__label {
  color: var(--muted);
  font-size: 14px;
  text-align: right;
  line-height: 1.6;
}

/* ---------- 年份时间线 ---------- */

.page-about .about-timeline {
  padding-block: clamp(48px, 8vw, 92px);
}

.page-about .about-timeline .section-head {
  max-width: 46em;
  margin-bottom: clamp(28px, 5vw, 48px);
}

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

.page-about .tl__item {
  position: relative;
  display: grid;
  gap: 10px;
  padding-block: clamp(20px, 3.4vw, 30px);
  border-top: 1px solid var(--hairline);
}

.page-about .tl__item:last-child {
  border-bottom: 1px solid var(--hairline);
}

.page-about .tl__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: -1px;
  width: 0;
  height: 1px;
  background: var(--edge);
  transition: width 0.5s var(--ease);
}

.page-about .tl__item:hover::before {
  width: 88px;
}

@media (min-width: 820px) {
  .page-about .tl__item {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    column-gap: clamp(24px, 4vw, 56px);
    align-items: start;
  }
}

.page-about .tl__year {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-family: var(--mono);
  font-size: 19px;
  letter-spacing: 0.06em;
  color: var(--gold);
  line-height: 1.3;
}

.page-about .tl__year::after {
  content: "";
  width: 46px;
  height: 1px;
  background: linear-gradient(90deg, rgba(255, 199, 102, 0.8), rgba(255, 199, 102, 0));
}

.page-about .tl__title {
  margin: 0 0 8px;
  font-size: clamp(19px, 2.4vw, 22px);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--paper);
  line-height: 1.45;
}

.page-about .tl__body p {
  margin: 0;
  color: var(--soft);
  font-size: 17px;
  line-height: 1.85;
  max-width: 60ch;
}

/* ---------- 内容版图 ---------- */

.page-about .about-catalog {
  padding-block: clamp(48px, 8vw, 92px);
}

.page-about .about-catalog .section-head {
  max-width: 44em;
}

.page-about .catalog-figure {
  margin: clamp(26px, 5vw, 44px) 0 0;
}

.page-about .cats {
  list-style: none;
  margin: clamp(30px, 5vw, 48px) 0 0;
  padding: 0;
}

.page-about .cat {
  display: grid;
  gap: 10px;
  padding-block: clamp(16px, 2.6vw, 22px);
  border-top: 1px solid var(--hairline);
}

.page-about .cat:last-child {
  border-bottom: 1px solid var(--hairline);
}

.page-about .cat__head {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .cat__name {
  font-size: clamp(18px, 2.4vw, 21px);
  font-weight: 700;
  color: var(--paper);
  letter-spacing: -0.01em;
}

.page-about .cat__meta {
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.03em;
  color: var(--muted);
}

.page-about .cat__bar {
  display: block;
  height: 8px;
  border-radius: 999px;
  background: rgba(22, 36, 74, 0.75);
  overflow: hidden;
}

.page-about .cat__fill {
  display: block;
  height: 100%;
  width: calc(var(--w, 12) * 1%);
  border-radius: inherit;
  background: linear-gradient(90deg, #7fe9ff, #35c6a8);
  transition: box-shadow 0.35s var(--ease), filter 0.35s var(--ease);
}

.page-about .cat:nth-child(even) .cat__fill {
  background: linear-gradient(90deg, #ffc766, #7fe9ff);
}

.page-about .cat:hover .cat__fill {
  box-shadow: 0 0 20px rgba(127, 233, 255, 0.5);
  filter: saturate(1.18);
}

.page-about .cat__note {
  margin: 0;
  color: var(--faint);
  font-size: 15.5px;
  line-height: 1.8;
  max-width: 58ch;
}

@media (min-width: 820px) {
  .page-about .cat {
    grid-template-columns: var(--about-rail-cat) minmax(0, 1fr);
    grid-template-rows: auto auto;
    column-gap: clamp(24px, 4vw, 56px);
    row-gap: 8px;
    align-items: center;
  }

  .page-about .cat__head {
    grid-column: 1;
    grid-row: 1;
  }

  .page-about .cat__bar {
    grid-column: 2;
    grid-row: 1;
  }

  .page-about .cat__note {
    grid-column: 2;
    grid-row: 2;
  }
}

/* ---------- 团队与地域 ---------- */

.page-about .about-region {
  padding-block: clamp(48px, 8vw, 92px);
}

.page-about .region-grid {
  display: grid;
  gap: clamp(28px, 5vw, 52px);
}

@media (min-width: 960px) {
  .page-about .region-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: clamp(36px, 5vw, 72px);
    align-items: start;
  }
}

.page-about .region-copy .section-head {
  max-width: 34em;
  margin-bottom: clamp(22px, 3.5vw, 32px);
}

.page-about .crew {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .crew__item {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 4px 12px;
  align-items: baseline;
  padding-block: 14px;
  border-top: 1px solid var(--hairline);
}

.page-about .crew__item:last-child {
  border-bottom: 1px solid var(--hairline);
}

.page-about .crew__idx {
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--cyan);
}

.page-about .crew__label {
  font-size: 16px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .crew__desc {
  grid-column: 2;
  font-size: 15px;
  line-height: 1.75;
  color: var(--faint);
}

@media (min-width: 700px) {
  .page-about .crew {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: clamp(20px, 4vw, 44px);
  }
}

.page-about .region-note {
  margin: clamp(20px, 3.4vw, 28px) 0 0;
  font-size: 16px;
  line-height: 1.85;
  color: var(--soft);
  max-width: 58ch;
}

.page-about .nodes-wrap {
  margin-top: clamp(24px, 4vw, 36px);
  padding-top: clamp(20px, 3vw, 28px);
  border-top: 1px dashed var(--hairline);
}

.page-about .nodes {
  display: block;
  width: 100%;
  max-width: 340px;
  height: auto;
}

.page-about .nodes__label {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  fill: #8a97b8;
}

.page-about .nodes__caption {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--faint);
  max-width: 46ch;
}

.page-about .region-figure {
  margin: 0;
}

/* ---------- 内容合作方 ---------- */

.page-about .about-partners {
  padding-block: clamp(46px, 7.5vw, 88px);
}

.page-about .partner-grid {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
}

@media (min-width: 900px) {
  .page-about .partner-grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: clamp(32px, 5vw, 72px);
    align-items: start;
  }
}

.page-about .partner-body p {
  margin: 0 0 16px;
  font-size: 17px;
  line-height: 1.85;
  color: var(--soft);
  max-width: 62ch;
}

.page-about .partner-stats {
  list-style: none;
  margin: clamp(24px, 4vw, 34px) 0 0;
  padding: 0;
  display: grid;
  gap: 18px;
  grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
}

.page-about .partner-stats li {
  position: relative;
  padding-left: 16px;
}

.page-about .partner-stats li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.45em;
  width: 2px;
  height: 1.7em;
  background: var(--edge);
}

.page-about .partner-stats .num {
  display: block;
  font-family: var(--mono);
  font-size: clamp(19px, 3vw, 25px);
  letter-spacing: 0.03em;
  color: var(--gold);
}

.page-about .partner-stats .lbl {
  display: block;
  margin-top: 5px;
  font-size: 14px;
  line-height: 1.6;
  color: var(--muted);
}

/* ---------- 迭代节奏 ---------- */

.page-about .about-cadence {
  padding-block: clamp(48px, 8vw, 92px);
}

.page-about .cadence-figure {
  margin: 0 0 clamp(30px, 5vw, 50px);
}

.page-about .about-cadence .section-head {
  max-width: 44em;
}

.page-about .cadence {
  list-style: none;
  margin: clamp(26px, 4vw, 38px) 0 clamp(30px, 4.5vw, 46px);
  padding: 0;
  display: grid;
  gap: clamp(24px, 4vw, 32px);
}

@media (min-width: 860px) {
  .page-about .cadence {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: clamp(20px, 3vw, 34px);
  }
}

.page-about .cadence__item {
  position: relative;
  padding-top: 20px;
  border-top: 1px solid var(--hairline);
}

.page-about .cadence__item::before {
  content: "";
  position: absolute;
  top: -4.5px;
  left: 0;
  width: 8px;
  height: 8px;
  transform: rotate(45deg);
  background: var(--cyan);
}

.page-about .cadence__item:nth-child(2)::before {
  background: var(--gold);
}

.page-about .cadence__item:nth-child(3)::before {
  background: var(--green);
}

.page-about .cadence__num {
  display: block;
  margin-bottom: 8px;
  font-family: var(--mono);
  font-size: 15.5px;
  letter-spacing: 0.05em;
  color: var(--cyan);
}

.page-about .cadence__item:nth-child(2) .cadence__num {
  color: var(--gold);
}

.page-about .cadence__item:nth-child(3) .cadence__num {
  color: var(--green);
}

.page-about .cadence__item p {
  margin: 0;
  font-size: 16px;
  line-height: 1.85;
  color: var(--soft);
  max-width: 42ch;
}

/* ---------- 折叠面板 ---------- */

.page-about .folds {
  display: grid;
}

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

.page-about .fold:last-of-type {
  border-bottom: 1px solid var(--hairline);
}

.page-about .fold__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 14px;
  padding-block: clamp(16px, 2.6vw, 22px);
  cursor: pointer;
  list-style: none;
}

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

.page-about .fold__head:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

.page-about .fold__index {
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--cyan);
}

.page-about .fold__title {
  font-size: clamp(16.5px, 2.2vw, 19px);
  font-weight: 700;
  line-height: 1.5;
  color: var(--paper);
}

.page-about .fold__icon {
  position: relative;
  width: 16px;
  height: 16px;
}

.page-about .fold__icon::before,
.page-about .fold__icon::after {
  content: "";
  position: absolute;
  background: var(--cyan);
  transition: transform 0.3s var(--ease), opacity 0.3s var(--ease);
}

.page-about .fold__icon::before {
  left: 0;
  top: 7.5px;
  width: 16px;
  height: 1px;
}

.page-about .fold__icon::after {
  left: 7.5px;
  top: 0;
  width: 1px;
  height: 16px;
}

.page-about .fold[open] .fold__icon::after {
  transform: scaleY(0);
  opacity: 0;
}

.page-about .fold__body {
  padding-bottom: clamp(18px, 3vw, 26px);
}

.page-about .fold__body p {
  margin: 0 0 10px;
  font-size: 16.5px;
  line-height: 1.85;
  color: var(--soft);
  max-width: 62ch;
}

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

/* ---------- 收束 ---------- */

.page-about .about-next {
  padding-block: clamp(44px, 7vw, 84px) clamp(56px, 9vw, 100px);
}

.page-about .next-grid {
  display: grid;
  gap: clamp(22px, 4vw, 36px);
  align-items: center;
  padding-top: clamp(28px, 5vw, 44px);
  border-top: 1px solid var(--hairline);
}

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

.page-about .next-grid h2 {
  margin: 0 0 10px;
  font-size: clamp(24px, 3.4vw, 32px);
  letter-spacing: -0.02em;
}

.page-about .next-grid p {
  margin: 0;
  font-size: 16px;
  line-height: 1.8;
  color: var(--muted);
  max-width: 42ch;
}

.page-about .next-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 窄屏兜底 ---------- */

@media (max-width: 480px) {
  .page-about .fact {
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
  }

  .page-about .fact__label {
    text-align: left;
  }

  .page-about .next-links .btn {
    width: 100%;
    justify-content: center;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .tl__item::before,
  .page-about .cat__fill,
  .page-about .fold__icon::before,
  .page-about .fold__icon::after {
    transition: none;
  }
}
<<<END>>>

.page-about {
  --w: 1rem;
}