.page-about {
  --about-line-dark: rgba(169, 180, 194, 0.28);
  --about-line-ink: rgba(10, 26, 47, 0.18);
}

.page-about .about-hero {
  padding-top: clamp(110px, 15vw, 168px);
  padding-bottom: clamp(48px, 8vw, 96px);
}

.page-about .breadcrumb {
  margin-bottom: clamp(26px, 5vw, 52px);
}

.page-about .about-hero .breadcrumb__link,
.page-about .about-hero .breadcrumb__current,
.page-about .about-hero .breadcrumb__sep {
  color: var(--steel);
}

.page-about .about-hero .breadcrumb__link:hover,
.page-about .about-hero .breadcrumb__link:focus-visible {
  color: var(--amber);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(28px, 5vw, 56px);
}

.page-about .about-hero__anchor {
  margin: 0 0 clamp(10px, 2vw, 18px);
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: clamp(3.4rem, 15vw, 10.5rem);
  line-height: 0.84;
  letter-spacing: -0.05em;
  color: var(--amber);
  overflow-wrap: anywhere;
}

.page-about .about-hero__title {
  margin: 0;
  max-width: 20ch;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.65rem, 4.6vw, 2.9rem);
  line-height: 1.16;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .about-hero__mark {
  margin: 0 0 clamp(14px, 2.5vw, 22px);
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  color: var(--steel);
}

.page-about .about-hero__lead {
  margin: 0 0 clamp(24px, 4vw, 36px);
  max-width: 46ch;
  font-size: clamp(1rem, 1.7vw, 1.0625rem);
  line-height: 1.78;
  color: var(--mist);
}

.page-about .about-notes {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--about-line-dark);
}

.page-about .about-notes__item {
  display: grid;
  grid-template-columns: auto 1fr;
  column-gap: 14px;
  row-gap: 3px;
  padding: 14px 0;
  border-bottom: 1px solid var(--about-line-dark);
}

.page-about .about-notes__num {
  grid-row: 1 / span 2;
  padding-top: 3px;
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  color: var(--amber);
}

.page-about .about-notes__title {
  margin: 0;
  font-size: 1rem;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-notes__text {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.66;
  color: var(--steel);
}

/* —— 起点 —— */
.page-about .about-origin__grid {
  display: grid;
  gap: clamp(22px, 4vw, 48px);
}

.page-about .about-origin__body p {
  margin: 0 0 1.2em;
  max-width: 62ch;
  color: var(--ink);
  line-height: 1.78;
}

.page-about .about-quote {
  margin: clamp(20px, 3vw, 32px) 0 0;
  padding-left: clamp(14px, 2vw, 20px);
  border-left: 3px solid var(--amber);
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.2rem, 2.6vw, 1.7rem);
  line-height: 1.36;
  letter-spacing: -0.01em;
  color: var(--wine);
}

.page-about .about-link {
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid var(--amber);
  padding-bottom: 1px;
}

.page-about .about-link:hover,
.page-about .about-link:focus-visible {
  color: var(--wine);
  border-bottom-color: var(--wine);
}

.page-about .about-link--light {
  color: var(--paper);
}

.page-about .about-link--light:hover,
.page-about .about-link--light:focus-visible {
  color: var(--amber);
  border-bottom-color: var(--amber);
}

/* —— 队伍 —— */
.page-about .about-team__grid {
  display: grid;
  gap: clamp(26px, 4vw, 46px);
  margin-top: clamp(22px, 4vw, 38px);
}

.page-about .about-team__copy p {
  margin: 0 0 1.2em;
  max-width: 56ch;
  color: var(--mist);
  line-height: 1.78;
}

.page-about .about-team .data-list {
  margin: clamp(18px, 3vw, 26px) 0;
  border-top: 1px solid var(--about-line-dark);
}

.page-about .about-team .data-list__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 11px 0;
  border-bottom: 1px solid var(--about-line-dark);
}

.page-about .about-team .data-list__k {
  font-size: 0.9375rem;
  color: var(--steel);
}

.page-about .about-team .data-list__v {
  font-family: var(--font-mono);
  font-size: 0.98rem;
  letter-spacing: 0.03em;
  color: var(--amber);
  white-space: nowrap;
}

.page-about .figure__media {
  overflow: hidden;
  background: var(--ink);
}

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

.page-about .about-team__figure .figure__media {
  aspect-ratio: 3 / 2;
}

.page-about .figure__cap {
  margin-top: 10px;
  font-size: 0.8125rem;
  line-height: 1.6;
  color: var(--steel);
}

/* —— 节奏 —— */
.page-about .about-cadence__lead {
  margin: clamp(16px, 2.5vw, 24px) 0 0;
  max-width: 64ch;
  line-height: 1.78;
  color: var(--mist);
}

.page-about .about-cadence__steps {
  display: grid;
  gap: 1px;
  margin: clamp(24px, 4vw, 38px) 0;
  background: var(--about-line-dark);
  border: 1px solid var(--about-line-dark);
}

.page-about .about-step {
  display: grid;
  gap: 8px;
  padding: clamp(16px, 3vw, 24px);
  background: var(--indigo);
}

.page-about .about-step__cycle {
  font-size: 0.95rem;
  letter-spacing: 0.06em;
  color: var(--amber);
}

.page-about .about-step__text {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.68;
  color: var(--mist);
}

.page-about .about-cadence__note {
  margin: 0;
  max-width: 64ch;
  line-height: 1.78;
  color: var(--steel);
}

/* —— 历程 —— */
.page-about .about-timeline__figure {
  margin: clamp(22px, 4vw, 36px) 0 0;
}

.page-about .about-timeline__figure .figure__media {
  aspect-ratio: 2 / 1;
}

.page-about .about-timeline__figure .figure__cap {
  color: var(--slate);
}

.page-about .about-timeline__wrap {
  display: grid;
  gap: clamp(28px, 4vw, 48px);
  margin-top: clamp(26px, 4vw, 44px);
}

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

.page-about .about-tl::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 14px;
  bottom: 14px;
  width: 1px;
  background: var(--about-line-ink);
}

.page-about .about-tl__item {
  position: relative;
  padding-left: 30px;
}

.page-about .about-tl__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 17px;
  width: 13px;
  height: 13px;
  box-sizing: border-box;
  background: var(--paper);
  border: 2px solid var(--indigo);
}

.page-about .about-tl__item--now::before {
  background: var(--amber);
  border-color: var(--amber);
}

.page-about .about-tl__item details {
  border-bottom: 1px solid var(--about-line-ink);
}

.page-about .about-tl__item summary {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 14px;
  padding: 12px 26px 12px 0;
  list-style: none;
  cursor: pointer;
}

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

.page-about .about-tl__item summary::after {
  content: "+";
  position: absolute;
  right: 0;
  top: 10px;
  font-family: var(--font-mono);
  font-size: 1rem;
  color: var(--slate);
}

.page-about .about-tl__item details[open] summary::after {
  content: "–";
  color: var(--wine);
}

.page-about .about-tl__item summary:hover .about-tl__title,
.page-about .about-tl__item summary:focus-visible .about-tl__title {
  color: var(--wine);
}

.page-about .about-tl__item summary:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: 3px;
}

.page-about .about-tl__year {
  font-size: 1.02rem;
  letter-spacing: 0.05em;
  color: var(--wine);
}

.page-about .about-tl__title {
  font-size: 0.98rem;
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-tl__body {
  margin: 0 0 18px;
  max-width: 48ch;
  line-height: 1.72;
  color: var(--slate);
}

.page-about .about-timeline__note {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  color: var(--slate);
}

.page-about .about-tags {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--about-line-ink);
  border: 1px solid var(--about-line-ink);
}

.page-about .about-tag {
  display: grid;
  gap: 4px;
  padding: clamp(14px, 2.5vw, 20px);
  background: var(--paper);
}

.page-about .about-tag__num {
  font-size: clamp(1.4rem, 3vw, 1.9rem);
  letter-spacing: -0.02em;
  color: var(--ink);
}

.page-about .about-tag__label {
  font-size: 0.78rem;
  letter-spacing: 0.05em;
  color: var(--slate);
}

/* —— 支持 —— */
.page-about .about-support__grid {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  margin-top: clamp(20px, 3vw, 32px);
}

.page-about .about-support__copy p {
  margin: 0 0 1.1em;
  max-width: 58ch;
  line-height: 1.78;
  color: var(--mist);
}

.page-about .about-support__action {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin: clamp(18px, 3vw, 26px) 0 1.1em;
}

.page-about .about-support .copy-mail {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 10px 18px;
  border: 1px solid var(--paper);
  border-radius: 999px;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  letter-spacing: 0.02em;
  cursor: pointer;
}

.page-about .about-support .copy-mail:hover,
.page-about .about-support .copy-mail:focus-visible {
  background: var(--amber);
  border-color: var(--amber);
}

.page-about .about-support .copy-mail:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: 3px;
}

.page-about .about-support .copy-mail__dot {
  width: 8px;
  height: 8px;
  flex: none;
  border-radius: 50%;
  background: var(--green);
}

.page-about .about-support .copy-status {
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  color: var(--steel);
}

.page-about .about-support__hint {
  font-size: 0.9rem;
  color: var(--steel);
}

.page-about .about-contact {
  border-top: 1px solid var(--about-line-dark);
}

.page-about .about-contact__row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 3px;
  padding: 13px 0;
  border-bottom: 1px solid var(--about-line-dark);
}

.page-about .about-contact__k {
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  color: var(--steel);
}

.page-about .about-contact__v {
  font-size: 0.9375rem;
  line-height: 1.62;
  color: var(--paper);
}

/* —— 依据 —— */
.page-about .about-proof__grid {
  display: grid;
  gap: clamp(26px, 4vw, 46px);
  margin-top: clamp(22px, 4vw, 36px);
}

.page-about .about-proof__lead {
  margin: 0 0 1.2em;
  max-width: 56ch;
  line-height: 1.78;
  color: var(--mist);
}

.page-about .about-proof__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: clamp(18px, 3vw, 26px);
  background: var(--about-line-dark);
  border: 1px solid var(--about-line-dark);
}

.page-about .about-proof__stat {
  display: grid;
  gap: 5px;
  padding: clamp(14px, 2.5vw, 20px);
  background: var(--ink);
}

.page-about .about-proof__num {
  font-size: clamp(1.1rem, 2.4vw, 1.5rem);
  letter-spacing: -0.01em;
  color: var(--amber);
}

.page-about .about-proof__label {
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  color: var(--steel);
}

.page-about .about-proof__figure .figure__media {
  aspect-ratio: 1 / 1;
}

/* —— 收束 —— */
.page-about .about-cta__inner {
  display: grid;
  gap: clamp(20px, 3vw, 36px);
  align-items: end;
}

.page-about .about-cta__lead {
  margin: 12px 0 0;
  max-width: 52ch;
  line-height: 1.76;
  color: var(--ink);
}

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

@media (min-width: 480px) {
  .page-about .about-contact__row {
    grid-template-columns: 92px 1fr;
    gap: 14px;
  }
}

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

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

@media (min-width: 860px) {
  .page-about .about-origin__grid {
    grid-template-columns: minmax(0, 4fr) minmax(0, 7fr);
    align-items: start;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    align-items: start;
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    align-items: start;
  }

  .page-about .about-timeline__wrap {
    grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
    align-items: start;
  }

  .page-about .about-support__grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    align-items: start;
  }

  .page-about .about-proof__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: start;
  }

  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 7fr) auto;
  }
}

@media (min-width: 1000px) {
  .page-about .about-cadence__steps {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-link,
  .page-about .about-tl__title,
  .page-about .about-support .copy-mail {
    transition: none;
  }
}