.page-about {
  --about-glow: rgba(255, 138, 31, .16);
  --about-cyan-glow: rgba(47, 214, 232, .12);
  --about-warm: rgba(242, 237, 228, .04);
}

/* ============ 首屏 ============ */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  background: var(--ink);
  padding-block: clamp(44px, 7vw, 88px) clamp(48px, 8vw, 96px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(90deg, var(--line-soft) 1px, transparent 1px),
    linear-gradient(0deg, var(--line-soft) 1px, transparent 1px);
  background-size: 72px 72px;
  -webkit-mask-image: radial-gradient(120% 80% at 78% 12%, rgba(0, 0, 0, .9), transparent 68%);
  mask-image: radial-gradient(120% 80% at 78% 12%, rgba(0, 0, 0, .9), transparent 68%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  top: -18%;
  right: -12%;
  width: 46vw;
  height: 46vw;
  max-width: 620px;
  max-height: 620px;
  background: radial-gradient(circle, var(--about-glow) 0%, transparent 62%);
  pointer-events: none;
}

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

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 40px;
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(34px, 7.4vw, 74px);
  line-height: 1.12;
  letter-spacing: .01em;
  color: var(--sand);
}

.page-about .about-hero__lede {
  margin: 22px 0 0;
  max-width: 46ch;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.9;
  color: var(--silver);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.page-about .about-hero__side {
  border: 1px solid var(--line);
  background: linear-gradient(180deg, var(--about-warm), transparent 70%);
  padding: 22px 22px 8px;
}

.page-about .about-hero__side-title {
  margin: 0 0 16px;
  color: var(--cyan);
}

.page-about .fact-stack {
  margin: 0;
}

.page-about .fact-stack__item {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 0;
  border-top: 1px solid var(--line);
}

.page-about .fact-stack__label {
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--silver);
}

.page-about .fact-stack__value {
  margin: 0;
  font-size: 20px;
  font-weight: 500;
  letter-spacing: .04em;
  color: var(--sand);
}

/* ============ 时间轴区块 ============ */
.page-about .about-timeline {
  position: relative;
}

.page-about .about-timeline__head {
  max-width: 62ch;
}

.page-about .about-timeline__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(26px, 4.4vw, 42px);
  line-height: 1.28;
  letter-spacing: .01em;
  color: var(--sand);
}

.page-about .about-timeline__intro {
  margin: 18px 0 0;
  max-width: 40ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--silver);
}

.page-about .about-timeline__figure {
  margin: 36px 0 0;
}

.page-about .timeline {
  list-style: none;
  margin: 34px 0 0;
  padding: 0;
  position: relative;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 6px;
  bottom: 6px;
  width: 1px;
  background: linear-gradient(180deg, var(--line-strong), var(--line-soft) 82%, transparent);
}

.page-about .timeline__item {
  position: relative;
  display: grid;
  grid-template-columns: 22px minmax(0, 1fr);
  column-gap: 18px;
  padding: 22px 0;
  border-top: 1px solid var(--line);
}

.page-about .timeline__item:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .timeline__marker {
  grid-column: 1;
  grid-row: 1 / span 2;
  justify-self: start;
  align-self: start;
  width: 11px;
  height: 11px;
  margin-top: 6px;
  margin-left: 0;
  border-radius: 50%;
  background: var(--amber);
  box-shadow: 0 0 0 5px var(--about-glow);
}

.page-about .timeline__meta {
  grid-column: 2;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 6px;
}

.page-about .timeline__ver {
  font-size: 13px;
  letter-spacing: .12em;
  color: var(--amber);
}

.page-about .timeline__date {
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--silver);
}

.page-about .timeline__body {
  grid-column: 2;
}

.page-about .timeline__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(17px, 2.1vw, 20px);
  line-height: 1.5;
  color: var(--sand);
}

.page-about .timeline__text {
  margin: 8px 0 0;
  max-width: 56ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--silver);
}

/* ============ 团队 ============ */
.page-about .about-crew__head {
  max-width: 60ch;
}

.page-about .about-crew__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(26px, 4.2vw, 40px);
  line-height: 1.3;
  color: var(--sand);
}

.page-about .about-crew__intro {
  margin: 18px 0 0;
  max-width: 44ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--silver);
}

.page-about .crew__layout {
  margin-top: 36px;
}

.page-about .crew__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .crew__card {
  position: relative;
  padding: 24px 22px;
  background: var(--panel);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-sm);
  transition: border-color .28s ease, box-shadow .28s ease, transform .28s ease;
}

.page-about .crew__card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--cyan);
  opacity: 0;
  transition: opacity .28s ease;
}

.page-about .crew__card:hover,
.page-about .crew__card:focus-within {
  border-color: var(--line-strong);
  box-shadow: var(--shadow);
}

.page-about .crew__card:hover::before,
.page-about .crew__card:focus-within::before {
  opacity: 1;
}

.page-about .crew__num {
  margin: 0;
  font-size: 26px;
  font-weight: 500;
  letter-spacing: .06em;
  color: var(--amber);
  line-height: 1;
}

.page-about .crew__title {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  letter-spacing: .04em;
  color: var(--sand);
}

.page-about .crew__text {
  margin: 10px 0 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--silver);
}

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

/* ============ 流程 ============ */
.page-about .about-flow__wrap {
  max-width: 100%;
}

.page-about .about-flow__head {
  max-width: 58ch;
}

.page-about .about-flow__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(26px, 4.2vw, 40px);
  line-height: 1.3;
  color: var(--ink);
}

.page-about .about-flow__intro {
  margin: 18px 0 0;
  max-width: 42ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--steel);
}

.page-about .about-flow__figure {
  margin: 32px 0 0;
  max-width: 520px;
}

.page-about .flow {
  list-style: none;
  margin: 34px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
  counter-reset: flow;
}

.page-about .flow__step {
  padding: 24px 0;
  border-top: 1px solid rgba(10, 26, 47, .16);
}

.page-about .flow__index {
  margin: 0;
  font-size: 12px;
  letter-spacing: .16em;
  color: #6B1F3A;
}

.page-about .flow__step-title {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 19px;
  letter-spacing: .02em;
  color: var(--ink);
}

.page-about .flow__step-text {
  margin: 10px 0 0;
  max-width: 40ch;
  font-size: 15px;
  line-height: 1.9;
  color: #2A4258;
}

.page-about .about-flow__note {
  margin: 30px 0 0;
  padding-left: 18px;
  border-left: 2px solid var(--burgundy);
  max-width: 44ch;
  font-size: 14.5px;
  line-height: 1.85;
  color: #2A4258;
}

/* ============ 年度报告 ============ */
.page-about .about-report__head {
  max-width: 58ch;
}

.page-about .about-report__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(25px, 4.1vw, 38px);
  line-height: 1.32;
  color: var(--sand);
}

.page-about .about-report__intro {
  margin: 18px 0 0;
  max-width: 42ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--silver);
}

.page-about .report__stats {
  margin: 34px 0 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .report__stat {
  background: var(--ink);
  padding: 22px 20px;
}

.page-about .report__stat-label {
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--silver);
}

.page-about .report__stat-value {
  margin: 12px 0 0;
  font-size: clamp(28px, 4.6vw, 40px);
  font-weight: 500;
  letter-spacing: .02em;
  color: var(--cyan);
  line-height: 1.1;
}

.page-about .report__body {
  margin-top: 32px;
  max-width: 40ch;
}

.page-about .report__body p {
  margin: 0 0 1.2em;
  font-size: 16px;
  line-height: 1.9;
  color: var(--silver);
}

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

/* ============ 资质 ============ */
.page-about .about-creds__head {
  max-width: 58ch;
}

.page-about .about-creds__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(25px, 4.1vw, 38px);
  line-height: 1.32;
  color: var(--sand);
}

.page-about .about-creds__intro {
  margin: 18px 0 0;
  max-width: 44ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--silver);
}

.page-about .creds__list {
  list-style: none;
  margin: 34px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .creds__item {
  display: grid;
  grid-template-columns: 74px minmax(0, 1fr);
  gap: 18px;
  padding: 22px;
  background: rgba(10, 26, 47, .34);
  border: 1px solid var(--line);
  transition: border-color .28s ease;
}

.page-about .creds__item:hover {
  border-color: var(--line-strong);
}

.page-about .creds__mark {
  margin: 0;
  font-size: 20px;
  font-weight: 500;
  letter-spacing: .03em;
  color: var(--amber);
  line-height: 1.3;
}

.page-about .creds__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  letter-spacing: .03em;
  color: var(--sand);
}

.page-about .creds__text {
  margin: 10px 0 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--silver);
}

/* ============ 收束 ============ */
.page-about .about-closing {
  background: var(--panel);
  border-top: 1px solid var(--line);
}

.page-about .about-closing__inner {
  max-width: 720px;
}

.page-about .about-closing__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(26px, 4.4vw, 42px);
  line-height: 1.28;
  color: var(--sand);
}

.page-about .about-closing__text {
  margin: 18px 0 0;
  max-width: 52ch;
  font-size: 16px;
  line-height: 1.9;
  color: var(--silver);
}

.page-about .about-closing__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

/* ============ 响应式 ============ */
@media (min-width: 640px) {
  .page-about .report__stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    gap: 56px;
    align-items: end;
  }

  .page-about .about-hero__actions {
    margin-top: 38px;
  }

  .page-about .timeline__item {
    grid-template-columns: 26px minmax(0, 1fr);
    column-gap: 26px;
    padding: 26px 0;
  }

  .page-about .crew__layout {
    display: grid;
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    gap: 40px;
    align-items: start;
  }

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

  .page-about .about-flow__wrap {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    column-gap: 56px;
    align-items: start;
  }

  .page-about .about-flow__head {
    grid-column: 1 / -1;
  }

  .page-about .about-flow__figure {
    grid-column: 2;
    grid-row: 2 / span 2;
    margin: 34px 0 0;
    max-width: none;
  }

  .page-about .flow {
    grid-column: 1;
    margin-top: 34px;
  }

  .page-about .flow__step {
    padding: 22px 0;
  }

  .page-about .flow__step:first-child {
    border-top: 0;
    padding-top: 0;
  }

  .page-about .about-flow__note {
    grid-column: 1;
    margin-top: 20px;
  }

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

  .page-about .report__body {
    max-width: none;
    column-count: 2;
    column-gap: 48px;
  }

  .page-about .report__body p {
    break-inside: avoid;
  }
}

@media (min-width: 1100px) {
  .page-about .creds__list {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .creds__item {
    grid-template-columns: minmax(0, 1fr);
    gap: 14px;
    padding: 26px 22px 30px;
  }

  .page-about .creds__mark {
    font-size: 28px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .crew__card,
  .page-about .creds__item {
    transition: none;
  }
}
</main>