.page-about {
  --about-line: rgba(168, 212, 240, 0.18);
  --about-gold: rgba(242, 169, 59, 0.62);
  --about-panel: rgba(15, 76, 129, 0.34);
  --about-panel-deep: rgba(6, 23, 38, 0.72);
  color: var(--frost);
  overflow-x: clip;
}

.page-about .cf-breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 10px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--sky);
}

.page-about .cf-breadcrumb li + li::before {
  content: "/";
  margin-right: 10px;
  color: rgba(168, 212, 240, 0.45);
}

.page-about .cf-breadcrumb a {
  color: var(--sky);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.page-about .cf-breadcrumb a:hover,
.page-about .cf-breadcrumb a:focus-visible {
  border-bottom-color: var(--gold);
  color: var(--gold-soft);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding-block: clamp(20px, 3vw, 32px) clamp(48px, 7vw, 96px);
  background:
    radial-gradient(120% 90% at 88% 4%, rgba(42, 125, 191, 0.36), transparent 60%),
    linear-gradient(180deg, var(--lake-deep) 0%, var(--ink) 100%);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--about-line) 18%, var(--about-line) 82%, transparent);
}

.page-about .about-hero__layout {
  display: grid;
  gap: clamp(32px, 5vw, 64px);
  align-items: center;
}

.page-about .about-hero__copy {
  min-width: 0;
}

.page-about .about-hero .cf-title--hero {
  margin-block: 0.28em 0.42em;
  transform-origin: left center;
}

.page-about .about-hero .cf-lede {
  max-width: 34em;
}

.page-about .about-hero .cf-cta-row {
  margin-top: clamp(20px, 3vw, 32px);
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(12px, 2vw, 24px);
  margin: clamp(28px, 4vw, 44px) 0 0;
  padding-top: clamp(18px, 2.6vw, 26px);
  border-top: 1px solid var(--about-line);
}

.page-about .about-hero__facts dt {
  margin-bottom: 6px;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--sky);
}

.page-about .about-hero__facts dd {
  margin: 0;
  display: flex;
  align-items: baseline;
  gap: 4px;
  font-family: var(--font-num);
  font-size: clamp(1.7rem, 4vw, 2.4rem);
  font-weight: 700;
  line-height: 1;
  color: var(--gold);
}

.page-about .about-hero__unit {
  font-size: 0.42em;
  letter-spacing: 0.08em;
  color: var(--gold-soft);
}

.page-about .about-hero__visual {
  margin: 0;
  position: relative;
}

.page-about .about-hero__visual::before {
  content: "";
  position: absolute;
  inset: -12px -12px auto auto;
  width: 42%;
  height: 42%;
  border-top: 1px solid var(--about-gold);
  border-right: 1px solid var(--about-gold);
  pointer-events: none;
}

.page-about .about-hero__visual .cf-figure__frame {
  position: relative;
  overflow: hidden;
  aspect-ratio: 900 / 1100;
  max-height: 620px;
  clip-path: polygon(0 3%, 100% 0, 100% 97%, 0 100%);
  background:
    linear-gradient(158deg, rgba(15, 76, 129, 0.85) 0%, rgba(6, 23, 38, 0.95) 72%),
    var(--ink);
  border: 1px solid var(--about-line);
}

.page-about .about-hero__visual .cf-figure__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  opacity: 0.94;
}

.page-about .about-hero__visual .cf-figure__caption {
  margin-top: 12px;
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--sky);
}

/* ---------- 通用行结构 ---------- */
.page-about .about-row {
  display: grid;
  gap: clamp(18px, 3vw, 34px);
}

.page-about .about-row__aside {
  display: flex;
  align-items: baseline;
  gap: 14px;
}

.page-about .about-row__aside .cf-eyebrow {
  margin: 0;
}

.page-about .about-seq {
  font-size: clamp(2.4rem, 6vw, 3.6rem);
  line-height: 0.86;
  color: transparent;
  -webkit-text-stroke: 1px rgba(168, 212, 240, 0.42);
  letter-spacing: 0.02em;
}

.page-about .about-row__body {
  min-width: 0;
}

.page-about .about-row__body .cf-title {
  margin-top: 0;
}

/* ---------- 缘起 ---------- */
.page-about .about-origin {
  padding-block: clamp(48px, 7vw, 96px);
  background: linear-gradient(180deg, var(--ink) 0%, var(--lake-deep) 100%);
}

.page-about .about-origin__list {
  margin-top: clamp(22px, 3vw, 34px);
  display: grid;
  gap: 14px;
}

.page-about .about-origin__list li {
  padding-left: 18px;
  border-left: 2px solid var(--about-gold);
  font-size: 16px;
  line-height: 1.75;
}

.page-about .about-origin__list strong {
  color: var(--gold-soft);
  font-weight: 700;
}

/* ---------- 三条准则 ---------- */
.page-about .about-principles {
  position: relative;
  padding-block: clamp(52px, 8vw, 104px);
  background: var(--lake-deep);
}

.page-about .about-principles::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, var(--about-gold) 0%, transparent 60%);
}

.page-about .about-principles__head {
  max-width: 46em;
}

.page-about .about-rules {
  display: grid;
  gap: clamp(16px, 2.4vw, 26px);
  margin-top: clamp(28px, 4vw, 46px);
}

.page-about .about-rule {
  position: relative;
  padding: clamp(22px, 3vw, 32px);
  background: var(--about-panel);
  border: 1px solid var(--about-line);
}

.page-about .about-rule__num {
  display: block;
  font-size: clamp(2rem, 5vw, 2.8rem);
  line-height: 1;
  color: var(--gold);
  margin-bottom: 12px;
}

.page-about .about-rule__title {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-size: clamp(1.25rem, 2.4vw, 1.6rem);
  letter-spacing: 0.01em;
  color: var(--frost);
}

.page-about .about-rule__text {
  margin: 0 0 16px;
  max-width: 34em;
  font-size: 15.5px;
  line-height: 1.78;
  color: rgba(247, 250, 252, 0.82);
}

.page-about .about-rule__result {
  margin: 0;
  padding-top: 14px;
  border-top: 1px dashed var(--about-line);
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--sky);
}

.page-about .about-rule__result .cf-chip {
  margin-right: 8px;
  vertical-align: 2px;
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  padding-block: clamp(52px, 8vw, 104px);
  background: linear-gradient(180deg, var(--lake-deep) 0%, var(--ink) 100%);
}

.page-about .about-team__layout {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
  margin-top: clamp(26px, 4vw, 44px);
}

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

.page-about .about-team__figure .cf-figure__frame {
  overflow: hidden;
  aspect-ratio: 1200 / 800;
  clip-path: polygon(3% 0, 100% 0, 97% 100%, 0 100%);
  border: 1px solid var(--about-line);
  background: var(--lake);
}

.page-about .about-team__figure .cf-figure__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.page-about .about-team__figure .cf-figure__caption {
  margin-top: 12px;
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--sky);
}

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

.page-about .about-team__item {
  padding: 16px 0 16px 20px;
  border-left: 1px solid var(--about-line);
  position: relative;
}

.page-about .about-team__item::before {
  content: "";
  position: absolute;
  left: -3px;
  top: 24px;
  width: 5px;
  height: 5px;
  background: var(--gold);
  transform: rotate(45deg);
}

.page-about .about-team__item h3 {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 1.05rem;
  letter-spacing: 0.04em;
  color: var(--gold-soft);
}

.page-about .about-team__item p {
  margin: 0;
  max-width: 36em;
  font-size: 15px;
  line-height: 1.76;
  color: rgba(247, 250, 252, 0.8);
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  position: relative;
  padding-block: clamp(52px, 8vw, 104px);
  background: var(--ink);
}

.page-about .about-timeline__figure {
  margin: clamp(26px, 4vw, 42px) 0 0;
}

.page-about .about-timeline__figure .cf-figure__frame {
  overflow: hidden;
  aspect-ratio: 1400 / 700;
  clip-path: polygon(0 6%, 100% 0, 100% 94%, 0 100%);
  border: 1px solid var(--about-line);
  background: linear-gradient(120deg, rgba(15, 76, 129, 0.6), rgba(31, 111, 92, 0.28));
}

.page-about .about-timeline__figure .cf-figure__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  opacity: 0.9;
}

.page-about .about-timeline__figure .cf-figure__caption {
  margin-top: 12px;
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--sky);
}

.page-about .about-timeline__track {
  margin: clamp(28px, 4vw, 48px) 0 0;
  padding: 0 0 0 clamp(14px, 2vw, 22px);
  list-style: none;
  border-left: 1px solid var(--about-line);
}

.page-about .about-timeline__item + .about-timeline__item {
  margin-top: 10px;
}

.page-about .about-timeline__item details {
  position: relative;
}

.page-about .about-timeline__item summary {
  position: relative;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: baseline;
  gap: 10px 16px;
  padding: 16px clamp(14px, 2vw, 22px);
  cursor: pointer;
  list-style: none;
  background: linear-gradient(90deg, rgba(15, 76, 129, 0.28), transparent 88%);
  border-left: 2px solid transparent;
  transition: background 0.24s ease, border-color 0.24s ease, transform 0.24s ease;
}

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

.page-about .about-timeline__item summary::after {
  content: "+";
  grid-column: 3;
  grid-row: 1;
  font-family: var(--font-num);
  font-size: 1.35rem;
  line-height: 1;
  color: var(--gold);
  transition: transform 0.24s ease;
}

.page-about .about-timeline__item details[open] summary::after {
  transform: rotate(45deg);
}

.page-about .about-timeline__item summary:hover,
.page-about .about-timeline__item summary:focus-visible {
  background: linear-gradient(90deg, rgba(42, 125, 191, 0.36), transparent 92%);
  border-left-color: var(--gold);
  outline: none;
}

.page-about .about-timeline__item summary:focus-visible {
  box-shadow: inset 0 0 0 2px var(--gold);
}

.page-about .about-timeline__dot {
  width: 10px;
  height: 10px;
  flex: none;
  background: var(--lake-bright);
  transform: rotate(45deg);
  grid-column: 1;
  grid-row: 1;
}

.page-about .about-timeline__item details[open] .about-timeline__dot {
  background: var(--gold);
}

.page-about .about-timeline__stage {
  grid-column: 1;
  grid-row: 2;
  grid-column-end: 2;
  font-family: var(--font-num);
  font-size: 0.95rem;
  letter-spacing: 0.16em;
  color: var(--sky);
}

.page-about .about-timeline__head {
  grid-column: 2;
  grid-row: 1 / span 2;
  font-family: var(--font-display);
  font-size: clamp(1.05rem, 2vw, 1.3rem);
  letter-spacing: 0.01em;
  color: var(--frost);
}

.page-about .about-timeline__panel {
  padding: 0 clamp(14px, 2vw, 22px) 20px 44px;
}

.page-about .about-timeline__panel p {
  margin: 0;
  max-width: 40em;
  font-size: 15.5px;
  line-height: 1.8;
  color: rgba(247, 250, 252, 0.8);
}

/* ---------- 服务承诺 ---------- */
.page-about .about-promise {
  position: relative;
  padding-block: clamp(52px, 8vw, 104px);
  background: linear-gradient(180deg, var(--ink) 0%, var(--lake-deep) 60%, var(--lake-deep) 100%);
}

.page-about .about-promise__head {
  max-width: 44em;
}

.page-about .about-promise__grid {
  display: grid;
  gap: clamp(14px, 2vw, 22px);
  margin-top: clamp(28px, 4vw, 44px);
}

.page-about .about-promise__card {
  padding: clamp(20px, 2.6vw, 28px);
  background: var(--about-panel-deep);
  border: 1px solid var(--about-line);
  border-top: 3px solid var(--felt);
}

.page-about .about-promise__card .cf-panel__label {
  color: var(--felt-lite);
}

.page-about .about-promise__card h3 {
  margin: 10px 0 10px;
  font-family: var(--font-display);
  font-size: clamp(1.1rem, 2.1vw, 1.35rem);
  color: var(--frost);
}

.page-about .about-promise__card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.76;
  color: rgba(247, 250, 252, 0.78);
}

.page-about .about-promise__actions {
  margin-top: clamp(24px, 3.4vw, 38px);
}

/* ---------- 社群合作 ---------- */
.page-about .about-partners {
  padding-block: clamp(52px, 8vw, 104px);
  background: var(--ink);
}

.page-about .about-partners__panel {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
  padding: clamp(24px, 4vw, 48px);
  background:
    linear-gradient(140deg, rgba(15, 76, 129, 0.55) 0%, rgba(6, 23, 38, 0.9) 62%),
    var(--lake-deep);
  border: 1px solid var(--about-line);
  clip-path: polygon(0 0, 100% 2.6%, 100% 100%, 0 97.4%);
}

.page-about .about-partners__copy {
  min-width: 0;
}

.page-about .about-partners__list {
  margin: clamp(20px, 3vw, 30px) 0 0;
  display: grid;
  gap: 12px;
}

.page-about .about-partners__list li {
  padding-left: 16px;
  border-left: 2px solid var(--about-gold);
  font-size: 15.5px;
  line-height: 1.75;
  color: rgba(247, 250, 252, 0.84);
}

.page-about .about-partners__list strong {
  color: var(--gold-soft);
}

.page-about .about-partners__copy .cf-cta-row {
  margin-top: clamp(22px, 3vw, 32px);
}

.page-about .about-partners__aside {
  padding: clamp(20px, 3vw, 28px);
  background: rgba(6, 23, 38, 0.62);
  border: 1px solid var(--about-line);
  align-self: start;
}

.page-about .about-partners__aside .cf-panel__label {
  color: var(--gold-soft);
}

.page-about .about-partners__facts {
  margin: 16px 0 0;
  display: grid;
  gap: 14px;
}

.page-about .about-partners__facts div {
  padding-bottom: 12px;
  border-bottom: 1px dashed var(--about-line);
}

.page-about .about-partners__facts div:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.page-about .about-partners__facts dt {
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--sky);
  margin-bottom: 5px;
}

.page-about .about-partners__facts dd {
  margin: 0;
  font-family: var(--font-num);
  font-size: 1.25rem;
  letter-spacing: 0.03em;
  color: var(--gold);
}

.page-about .about-partners__note {
  margin: 18px 0 0;
  font-size: 13.5px;
  line-height: 1.72;
  color: var(--sky);
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-rules {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-rules .about-rule:first-child {
    grid-column: 1 / -1;
  }

  .page-about .about-team__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: clamp(18px, 3vw, 34px);
  }

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

@media (min-width: 900px) {
  .page-about .about-hero__layout {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
  }

  .page-about .about-row {
    grid-template-columns: minmax(150px, 1fr) minmax(0, 3.4fr);
    column-gap: clamp(28px, 5vw, 70px);
  }

  .page-about .about-row__aside {
    flex-direction: column;
    gap: 12px;
    padding-top: 6px;
  }

  .page-about .about-team__layout {
    grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
    align-items: start;
  }

  .page-about .about-team__list {
    grid-template-columns: 1fr;
  }

  .page-about .about-promise__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-partners__panel {
    grid-template-columns: minmax(0, 1.55fr) minmax(240px, 0.85fr);
    align-items: start;
  }

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

  .page-about .about-rules .about-rule:first-child {
    grid-column: auto;
  }
}

@media (min-width: 1180px) {
  .page-about .about-hero__visual .cf-figure__frame {
    max-height: 720px;
  }
}

@media (max-width: 719px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-hero__visual .cf-figure__frame {
    max-height: 440px;
    clip-path: polygon(0 2%, 100% 0, 100% 98%, 0 100%);
  }

  .page-about .about-partners__panel {
    clip-path: none;
  }

  .page-about .about-timeline__panel {
    padding-left: 22px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-timeline__item summary,
  .page-about .about-timeline__item summary::after {
    transition: none;
  }
}