.page-about {
  --about-gap: clamp(56px, 8vw, 104px);
  --about-card: rgba(22, 56, 45, 0.45);
  --about-card-strong: rgba(22, 56, 45, 0.78);
  background: var(--ink);
  color: var(--white);
  overflow-x: clip;
}

/* ===== 首屏视觉带 ===== */
.page-about .about-hero {
  position: relative;
}

.page-about .about-hero__media {
  position: relative;
  height: clamp(220px, 42vw, 480px);
  overflow: hidden;
}

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 42%;
  filter: saturate(0.7) contrast(1.06) brightness(0.84);
}

.page-about .about-hero__media::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(11, 20, 16, 0.2) 0%, rgba(11, 20, 16, 0.62) 58%, var(--ink) 100%),
    linear-gradient(100deg, rgba(232, 184, 75, 0.12) 0%, rgba(11, 20, 16, 0) 55%);
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 2;
  margin-top: clamp(-170px, -15vw, -96px);
  padding-bottom: clamp(28px, 4vw, 48px);
}

.page-about .about-hero__kicker {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--gold);
}

.page-about .about-hero__title {
  margin: 0 0 20px;
  max-width: 16em;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(32px, 6.2vw, 60px);
  line-height: 1.08;
  letter-spacing: 0.05em;
  color: var(--white);
}

.page-about .about-hero__lede {
  margin: 0 0 clamp(26px, 3.6vw, 40px);
  max-width: 48em;
  font-size: clamp(15px, 1.7vw, 17px);
  line-height: 1.85;
  color: rgba(242, 246, 244, 0.82);
}

.page-about .about-badges {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-badge {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 2px 8px;
  padding: 16px 18px;
  border: 1px solid var(--hairline);
  border-left: 3px solid var(--gold);
  border-radius: var(--r-md);
  background: var(--about-card);
}

.page-about .about-badge__num {
  font-family: var(--font-mono);
  font-size: clamp(26px, 3.4vw, 32px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--gold);
}

.page-about .about-badge__unit {
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--gold-hi);
}

.page-about .about-badge__label {
  flex-basis: 100%;
  font-size: 13px;
  line-height: 1.6;
  color: var(--ash);
}

/* ===== 章节索引 ===== */
.page-about .about-index {
  border-top: 1px solid var(--hairline);
  border-bottom: 1px solid var(--hairline);
  background: linear-gradient(90deg, rgba(15, 42, 34, 0.92), rgba(11, 20, 16, 0.92));
}

.page-about .about-index__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 14px 0;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .about-index__list::-webkit-scrollbar {
  display: none;
}

.page-about .about-index__list li {
  flex: 0 0 auto;
}

.page-about .about-index__list a {
  display: inline-block;
  padding: 8px 18px;
  border: 1px solid var(--hairline);
  border-radius: var(--r-pill);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--ash);
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.25s var(--ease), border-color 0.25s var(--ease), background 0.25s var(--ease);
}

.page-about .about-index__list a:hover,
.page-about .about-index__list a:focus-visible {
  color: var(--ink);
  background: var(--gold);
  border-color: var(--gold);
  outline: none;
}

/* ===== 通用章节 ===== */
.page-about .about-section {
  padding: var(--about-gap) 0;
}

.page-about .about-section--turf {
  background: linear-gradient(180deg, var(--green) 0%, rgba(15, 42, 34, 0.72) 100%);
}

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

.page-about .section-head {
  margin-bottom: clamp(28px, 4vw, 48px);
}

.page-about .section-head__index {
  font-family: var(--font-mono);
  color: var(--gold);
}

.page-about .section-head__title {
  font-family: var(--font-display);
  letter-spacing: 0.05em;
  color: var(--white);
}

.page-about .section-head__meta {
  color: var(--ash);
}

/* ===== 01 时间轴 ===== */
.page-about .about-timeline__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
}

.page-about .about-timeline__track {
  position: relative;
  isolation: isolate;
  padding: 26px 22px 26px 34px;
  border: 1px solid var(--hairline);
  border-radius: var(--r-lg);
  background: linear-gradient(160deg, rgba(15, 42, 34, 0.9), rgba(11, 20, 16, 0.94));
  overflow: hidden;
}

.page-about .about-timeline__texture {
  position: absolute;
  inset: 0;
  z-index: -1;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.16;
  pointer-events: none;
}

.page-about .about-timeline__list {
  position: relative;
  margin: 0;
  padding: 0 0 0 26px;
  list-style: none;
  border-left: 1px solid var(--hairline-strong);
}

.page-about .about-timeline__item {
  position: relative;
  padding-bottom: 30px;
}

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

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -32px;
  top: 7px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--ash);
  box-shadow: 0 0 0 5px rgba(11, 20, 16, 0.92);
  transition: background 0.3s var(--ease), transform 0.3s var(--ease);
}

.page-about .about-timeline__item.is-current::before {
  background: var(--gold);
  transform: scale(1.4);
}

.page-about .about-timeline__year {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: clamp(19px, 2.6vw, 25px);
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--ash);
  transition: color 0.3s var(--ease);
}

.page-about .about-timeline__item.is-current .about-timeline__year {
  color: var(--gold);
}

.page-about .about-timeline__item h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(17px, 2vw, 21px);
  letter-spacing: 0.05em;
  color: var(--white);
}

.page-about .about-timeline__item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(147, 170, 161, 0.96);
}

.page-about .about-timeline__notes {
  display: grid;
  gap: 16px;
  align-content: start;
}

.page-about .about-note {
  margin: 0;
  padding: 18px 20px;
  border-left: 2px solid var(--blue);
  border-radius: 0 var(--r-md) var(--r-md) 0;
  background: rgba(61, 139, 253, 0.07);
  font-size: 14px;
  line-height: 1.8;
  color: var(--ash);
}

.page-about .about-note--gold {
  border-left-color: var(--gold);
  background: rgba(232, 184, 75, 0.08);
}

/* ===== 02 团队分工 ===== */
.page-about .about-team {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

.page-about .about-team__root {
  padding: 28px 24px;
  border: 1px solid rgba(232, 184, 75, 0.34);
  border-radius: var(--r-lg);
  background: radial-gradient(130% 110% at 0% 0%, rgba(232, 184, 75, 0.2), rgba(11, 20, 16, 0.92) 62%);
}

.page-about .about-team__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(54px, 9vw, 88px);
  font-weight: 700;
  line-height: 0.9;
  letter-spacing: -0.02em;
  color: var(--gold);
}

.page-about .about-team__unit {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--gold-hi);
}

.page-about .about-team__desc {
  margin: 18px 0 0;
  font-size: 14px;
  line-height: 1.85;
  color: rgba(242, 246, 244, 0.78);
}

.page-about .about-team__branches {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-team__branch {
  position: relative;
  padding: 22px 20px 22px 24px;
  border: 1px solid var(--hairline);
  border-radius: var(--r-md);
  background: linear-gradient(150deg, var(--about-card-strong), rgba(11, 20, 16, 0.86));
  transition: border-color 0.3s var(--ease);
}

.page-about .about-team__branch::before {
  content: "";
  position: absolute;
  left: 0;
  top: 20px;
  bottom: 20px;
  width: 3px;
  border-radius: 3px;
  background: var(--mint);
}

.page-about .about-team__branch:nth-child(1)::before {
  background: var(--gold);
}

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

.page-about .about-team__branch:hover {
  border-color: rgba(232, 184, 75, 0.42);
}

.page-about .about-team__idx {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--ash);
}

.page-about .about-team__branch h3 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(17px, 2vw, 21px);
  letter-spacing: 0.05em;
  color: var(--white);
}

.page-about .about-team__branch p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(147, 170, 161, 0.96);
}

/* ===== 03 核定链路 ===== */
.page-about .about-pipeline {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
}

.page-about .about-pipeline__figure {
  margin: 0;
  border: 1px solid var(--hairline);
  border-radius: var(--r-lg);
  background: var(--turf);
  overflow: hidden;
}

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

.page-about .about-pipeline__figure figcaption {
  padding: 12px 16px;
  border-top: 1px solid var(--hairline);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--ash);
}

.page-about .about-pipeline__steps {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-step {
  border: 1px solid var(--hairline);
  border-radius: var(--r-md);
  background: var(--about-card);
  transition: border-color 0.3s var(--ease), background 0.3s var(--ease);
}

.page-about .about-step[open] {
  border-color: rgba(232, 184, 75, 0.42);
  background: var(--about-card-strong);
}

.page-about .about-step__summary {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 12px;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-step__summary:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: -2px;
  border-radius: var(--r-md);
}

.page-about .about-step__idx {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--gold);
}

.page-about .about-step__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(16px, 2vw, 19px);
  letter-spacing: 0.05em;
  color: var(--white);
}

.page-about .about-step__hint {
  display: inline-flex;
  align-items: center;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--ash);
  white-space: nowrap;
}

.page-about .about-step__hint::after {
  content: "+";
  margin-left: 10px;
  font-family: var(--font-mono);
  font-size: 16px;
  line-height: 1;
  color: var(--gold);
}

.page-about .about-step[open] .about-step__hint::after {
  content: "–";
}

.page-about .about-step__body {
  padding: 14px 18px 18px;
  border-top: 1px solid var(--hairline);
}

.page-about .about-step__body > p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(242, 246, 244, 0.8);
}

.page-about .about-step__io {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
  margin: 16px 0 0;
}

.page-about .about-step__io > div {
  padding: 12px 14px;
  border-left: 2px solid var(--blue);
  border-radius: var(--r-sm);
  background: rgba(11, 20, 16, 0.62);
}

.page-about .about-step__io > div:last-child {
  border-left-color: var(--gold);
}

.page-about .about-step__io dt {
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ash);
}

.page-about .about-step__io dd {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: rgba(242, 246, 244, 0.86);
}

/* ===== 04 共建伙伴 ===== */
.page-about .about-partners {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about .about-partner {
  position: relative;
  padding: 26px 22px;
  border: 1px solid var(--hairline);
  border-radius: var(--r-lg);
  background: linear-gradient(155deg, var(--about-card-strong), rgba(11, 20, 16, 0.9));
}

.page-about .about-partner--gold {
  background: linear-gradient(155deg, rgba(232, 184, 75, 0.16), rgba(11, 20, 16, 0.9) 68%);
  border-color: rgba(232, 184, 75, 0.34);
}

.page-about .about-partner--blue {
  border-color: rgba(61, 139, 253, 0.32);
}

.page-about .about-partner--mint {
  border-color: rgba(34, 199, 169, 0.32);
}

.page-about .about-partner__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(36px, 5.4vw, 52px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--gold);
}

.page-about .about-partner--blue .about-partner__num {
  color: var(--blue);
}

.page-about .about-partner--mint .about-partner__num {
  color: var(--mint);
}

.page-about .about-partner__title {
  margin: 10px 0 12px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(17px, 2vw, 21px);
  letter-spacing: 0.05em;
  color: var(--white);
}

.page-about .about-partner p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(147, 170, 161, 0.96);
}

.page-about .about-partners__foot {
  margin: clamp(24px, 3.4vw, 40px) 0 0;
  padding-top: 20px;
  border-top: 1px solid var(--hairline);
  font-size: 15px;
  line-height: 1.85;
  color: var(--ash);
}

.page-about .about-partners__foot a {
  color: var(--gold);
  text-decoration: none;
  border-bottom: 1px solid rgba(232, 184, 75, 0.42);
}

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

/* ===== 05 时间表 ===== */
.page-about .about-promise__panel {
  padding: clamp(26px, 4vw, 48px);
  border: 1px solid var(--hairline);
  border-radius: var(--r-lg);
  background:
    linear-gradient(115deg, rgba(232, 184, 75, 0.14) 0%, rgba(15, 42, 34, 0.92) 42%, rgba(11, 20, 16, 0.96) 100%);
}

.page-about .about-promise__head {
  max-width: 42em;
  margin-bottom: clamp(24px, 3.4vw, 40px);
}

.page-about .about-promise__head .section-head__title {
  margin: 10px 0 12px;
}

.page-about .about-promise__lede {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(242, 246, 244, 0.78);
}

.page-about .about-promise__stats {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin: 0;
  background: var(--hairline);
  border: 1px solid var(--hairline);
  border-radius: var(--r-md);
  overflow: hidden;
}

.page-about .about-promise__stat {
  padding: 22px 20px;
  background: rgba(11, 20, 16, 0.86);
}

.page-about .about-promise__stat dt {
  margin-bottom: 12px;
  font-size: 13px;
  line-height: 1.6;
  letter-spacing: 0.06em;
  color: var(--ash);
}

.page-about .about-promise__stat dd {
  display: flex;
  align-items: baseline;
  gap: 6px;
  margin: 0;
}

.page-about .about-promise__num {
  font-family: var(--font-mono);
  font-size: clamp(38px, 5.6vw, 56px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--gold);
}

.page-about .about-promise__unit {
  font-size: 14px;
  letter-spacing: 0.08em;
  color: var(--gold-hi);
}

.page-about .about-promise__note {
  margin: clamp(24px, 3.2vw, 36px) 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ash);
}

.page-about .about-promise__note a {
  color: var(--gold);
  text-decoration: none;
  border-bottom: 1px solid rgba(232, 184, 75, 0.42);
}

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

/* ===== 收束与联系 ===== */
.page-about .about-cta {
  padding-top: clamp(48px, 7vw, 88px);
  padding-bottom: clamp(56px, 8vw, 104px);
  border-top: 1px solid var(--hairline);
}

.page-about .about-cta__kicker {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--gold);
}

.page-about .about-cta__title {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(26px, 4.2vw, 40px);
  line-height: 1.14;
  letter-spacing: 0.05em;
  color: var(--white);
}

.page-about .about-cta__text {
  margin: 0 0 clamp(24px, 3.4vw, 36px);
  font-size: 16px;
  line-height: 1.85;
  color: rgba(242, 246, 244, 0.8);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: clamp(24px, 3.2vw, 36px);
}

.page-about .about-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 22px;
  margin: 0;
  padding: 20px 0 0;
  border-top: 1px solid var(--hairline);
  list-style: none;
}

.page-about .about-cta__links a {
  font-size: 14px;
  letter-spacing: 0.06em;
  color: var(--ash);
  text-decoration: none;
  transition: color 0.25s var(--ease);
}

.page-about .about-cta__links a:hover,
.page-about .about-cta__links a:focus-visible {
  color: var(--gold);
}

/* ===== 响应式 ===== */
@media (min-width: 640px) {
  .page-about .about-badges {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

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

@media (min-width: 880px) {
  .page-about .about-partners {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-partner--gold {
    grid-column: 1 / -1;
    padding: 32px 30px;
  }

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

  .page-about .about-team__branch:nth-child(1) {
    grid-column: 1 / -1;
  }
}

@media (min-width: 960px) {
  .page-about .about-timeline__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: clamp(32px, 5vw, 68px);
    align-items: start;
  }

  .page-about .about-team {
    grid-template-columns: minmax(250px, 4fr) minmax(0, 8fr);
    gap: clamp(28px, 4vw, 56px);
    align-items: start;
  }
}

@media (min-width: 1000px) {
  .page-about .about-pipeline {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: clamp(28px, 4vw, 56px);
    align-items: start;
  }

  .page-about .about-pipeline__figure {
    position: sticky;
    top: calc(var(--header-h) + 24px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}