.page-about {
  --about-pad: clamp(2.6rem, 6.5vw, 5.5rem);
  --about-card: rgba(15, 34, 71, .55);
  --about-card-strong: rgba(15, 34, 71, .92);
}

.page-about a:focus-visible,
.page-about button:focus-visible {
  outline: 2px solid var(--rape);
  outline-offset: 3px;
}

.page-about .about-crumbs {
  padding-top: clamp(.9rem, 2vw, 1.5rem);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-block: clamp(1.4rem, 3.5vw, 2.6rem) clamp(2.4rem, 5vw, 4rem);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(1.6rem, 4vw, 3rem);
  align-items: center;
}

.page-about .about-hero__title {
  margin: .7rem 0 0;
  font-family: var(--font-display);
  font-weight: 200;
  font-size: clamp(2.3rem, 6vw, 5.2rem);
  line-height: 1.06;
  letter-spacing: -.02em;
  color: var(--paper);
}

.page-about .about-hero__title strong {
  font-weight: 800;
  color: var(--rape);
}

.page-about .about-hero__lede {
  margin: 1.3rem 0 0;
  max-width: 36rem;
  color: var(--on-night);
  font-size: clamp(.98rem, 1.1vw, 1.08rem);
  line-height: 1.85;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .7rem;
  margin-top: 1.9rem;
}

.page-about .about-hero__media {
  margin: 0;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--deep);
  box-shadow: 0 34px 70px -42px rgba(0, 0, 0, .95);
}

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: 1.12fr .88fr;
    gap: clamp(2rem, 4.5vw, 4rem);
  }
  .page-about .about-hero__media {
    transform: rotate(-1.8deg);
  }
}

/* ---------- 章节索引 ---------- */
.page-about .about-index {
  margin-top: clamp(2rem, 5vw, 3.4rem);
  padding-top: 1rem;
  border-top: 1px solid var(--line);
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: .6rem 1.6rem;
}

.page-about .about-index__label {
  font-size: .7rem;
  letter-spacing: .24em;
  color: var(--haze);
}

.page-about .about-index__list {
  display: flex;
  flex-wrap: wrap;
  gap: .4rem 1.5rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-index__link {
  display: inline-flex;
  align-items: baseline;
  gap: .45rem;
  padding-bottom: .18rem;
  font-size: .9rem;
  color: var(--on-night);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .2s ease, border-color .2s ease;
}

.page-about .about-index__link .num {
  font-family: var(--font-num);
  font-size: .95em;
  color: var(--lake);
}

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

.page-about .about-index__link:hover .num,
.page-about .about-index__link:focus-visible .num {
  color: var(--rape);
}

/* ---------- 通用章节 ---------- */
.page-about .about-section {
  padding-block: var(--about-pad);
}

.page-about .about-section .section-head {
  max-width: 46rem;
}

.page-about .band--paper .section-title {
  color: var(--graphite);
}

.page-about .band--paper .eyebrow {
  color: var(--deep);
}

.page-about .band--paper .section-lede {
  color: var(--paper-muted);
}

/* ---------- 起点 ---------- */
.page-about .about-origin-band {
  position: relative;
  overflow: hidden;
  border-top: 1px solid var(--line);
}

.page-about .about-ridge {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  width: 100%;
  height: clamp(90px, 16vw, 200px);
  fill: none;
  stroke: rgba(28, 167, 167, .24);
  stroke-width: 1.4;
  pointer-events: none;
}

.page-about .about-origin {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(1.6rem, 4vw, 3rem);
}

@media (min-width: 920px) {
  .page-about .about-origin {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, .65fr);
    align-items: start;
  }
}

.page-about .about-body {
  margin-top: 1.2rem;
  color: var(--on-night);
  font-size: clamp(.98rem, 1.1vw, 1.05rem);
  line-height: 1.9;
}

.page-about .about-body p {
  margin: 0 0 1.1rem;
}

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

.page-about .about-body strong {
  color: var(--paper);
  font-weight: 600;
}

.page-about .about-note {
  margin: 0;
  padding: .2rem 0 .2rem 1.1rem;
  border-left: 2px solid var(--lake);
}

.page-about .about-note p {
  margin: 0;
  color: var(--on-night-soft);
  font-size: .92rem;
  line-height: 1.85;
}

.page-about .about-note .about-note__label {
  margin: 0 0 .55rem;
  font-size: .7rem;
  letter-spacing: .2em;
  color: var(--haze);
}

/* ---------- 版本时间线 ---------- */
.page-about .about-tl {
  list-style: none;
  margin: clamp(1.6rem, 4vw, 2.6rem) 0 0;
  padding: 0;
  display: grid;
  gap: clamp(.9rem, 2vw, 1.2rem);
}

.page-about .about-tl__item {
  display: grid;
  gap: .55rem 1.2rem;
  padding: 1.1rem 1.2rem 1.15rem 1.3rem;
  background: var(--about-card);
  border: 1px solid var(--line);
  border-left: 2px solid rgba(28, 167, 167, .55);
  border-radius: var(--radius);
  transition: transform .22s ease, border-color .22s ease, background .22s ease;
}

.page-about .about-tl__item:hover,
.page-about .about-tl__item:focus-within {
  transform: translateY(-3px);
  border-left-color: var(--lava);
  background: var(--about-card-strong);
}

.page-about .about-tl__year {
  font-family: var(--font-num);
  font-size: clamp(2.1rem, 4.5vw, 3.1rem);
  line-height: .95;
  letter-spacing: -.02em;
  color: var(--lake);
  transition: color .22s ease;
}

.page-about .about-tl__item:hover .about-tl__year,
.page-about .about-tl__item:focus-within .about-tl__year {
  color: var(--rape);
}

.page-about .about-tl__title {
  margin: .45rem 0 .35rem;
  font-size: clamp(1.02rem, 1.5vw, 1.22rem);
  font-weight: 600;
  color: var(--paper);
}

.page-about .about-tl__text {
  margin: 0;
  color: var(--on-night-soft);
  font-size: .93rem;
  line-height: 1.8;
}

@media (min-width: 760px) {
  .page-about .about-tl__item {
    grid-template-columns: 7.5rem minmax(0, 1fr);
    align-items: start;
  }
}

@media (min-width: 1000px) {
  .page-about .about-tl__item:nth-child(1) { margin-right: 22%; }
  .page-about .about-tl__item:nth-child(2) { margin-left: 11%; margin-right: 11%; }
  .page-about .about-tl__item:nth-child(3) { margin-left: 4%; margin-right: 19%; }
  .page-about .about-tl__item:nth-child(4) { margin-left: 16%; margin-right: 6%; }
  .page-about .about-tl__item:nth-child(5) { margin-left: 7%; margin-right: 15%; }
}

/* ---------- 数据流程 ---------- */
.page-about .about-method__grid {
  display: grid;
  gap: clamp(1.4rem, 3.5vw, 2.6rem);
  margin-top: clamp(1.6rem, 3.5vw, 2.4rem);
}

@media (min-width: 900px) {
  .page-about .about-method__grid {
    grid-template-columns: minmax(0, .95fr) minmax(0, 1.05fr);
    align-items: start;
  }
}

.page-about .about-method__media {
  margin: 0;
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--deep);
}

.page-about .about-method__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .about-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: .2rem;
}

.page-about .about-step {
  display: grid;
  grid-template-columns: 2.4rem minmax(0, 1fr);
  gap: .9rem;
  padding: 1rem 0;
  border-top: 1px solid var(--on-paper-line);
}

.page-about .about-step:first-child {
  border-top: none;
  padding-top: 0;
}

.page-about .about-step__no {
  font-family: var(--font-num);
  font-size: 1.5rem;
  line-height: 1.1;
  color: var(--deep);
}

.page-about .about-step__title {
  margin: 0 0 .25rem;
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--graphite);
}

.page-about .about-step__text {
  margin: 0;
  font-size: .92rem;
  line-height: 1.8;
  color: var(--paper-muted);
}

.page-about .about-roles {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: clamp(1.8rem, 4vw, 2.8rem);
  background: var(--on-paper-line);
  border-top: 1px solid var(--on-paper-line);
  border-bottom: 1px solid var(--on-paper-line);
}

.page-about .about-role {
  background: var(--paper);
  padding: 1.1rem 1rem 1.2rem;
}

.page-about .about-role__num {
  margin: 0;
  font-family: var(--font-num);
  font-size: clamp(2rem, 4vw, 2.8rem);
  line-height: 1;
  color: var(--deep);
}

.page-about .about-role__name {
  margin: .45rem 0 .3rem;
  font-size: .92rem;
  font-weight: 700;
  color: var(--graphite);
}

.page-about .about-role__desc {
  margin: 0;
  font-size: .84rem;
  line-height: 1.7;
  color: var(--paper-muted);
}

@media (min-width: 860px) {
  .page-about .about-roles {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 协作生态 ---------- */
.page-about .about-eco {
  display: grid;
  gap: clamp(1.4rem, 4vw, 3rem);
  margin-top: clamp(1.6rem, 3.5vw, 2.4rem);
}

@media (min-width: 900px) {
  .page-about .about-eco {
    grid-template-columns: minmax(0, .85fr) minmax(0, 1.15fr);
    align-items: start;
  }
}

.page-about .about-eco__media {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--night);
}

.page-about .about-eco__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.page-about .about-eco__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: .95rem;
}

.page-about .about-eco__item {
  display: flex;
  align-items: baseline;
  gap: .8rem;
  padding-bottom: .9rem;
  border-bottom: 1px solid var(--line);
}

.page-about .about-eco__num {
  font-family: var(--font-num);
  font-size: clamp(1.8rem, 3.4vw, 2.5rem);
  line-height: 1;
  color: var(--lake);
  flex: 0 0 auto;
}

.page-about .about-eco__label {
  color: var(--on-night);
  font-size: .93rem;
  line-height: 1.75;
}

.page-about .about-eco__text {
  margin: 1.2rem 0 1.4rem;
  color: var(--on-night-soft);
  font-size: .95rem;
  line-height: 1.85;
}

/* ---------- 规模与凭证 ---------- */
.page-about .about-scale {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: clamp(1.6rem, 3.5vw, 2.4rem);
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-scale__item {
  background: var(--night);
  padding: 1.2rem 1rem 1.3rem;
}

.page-about .about-scale__num {
  margin: 0;
  font-family: var(--font-num);
  font-size: clamp(2.2rem, 5vw, 3.5rem);
  line-height: .95;
  letter-spacing: -.01em;
  color: var(--rape);
}

.page-about .about-scale__num span {
  margin-left: .12em;
  font-family: var(--font-body);
  font-size: .42em;
  color: var(--on-night-soft);
}

.page-about .about-scale__label {
  margin: .5rem 0 0;
  font-size: .9rem;
  font-weight: 600;
  color: var(--paper);
}

.page-about .about-scale__desc {
  margin: .3rem 0 0;
  font-size: .82rem;
  line-height: 1.7;
  color: var(--on-night-soft);
}

@media (min-width: 860px) {
  .page-about .about-scale {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .about-honor {
  display: grid;
  gap: .9rem;
  margin-top: clamp(1.4rem, 3vw, 2rem);
}

.page-about .about-honor__item {
  display: grid;
  gap: .6rem;
  align-content: start;
  padding: .95rem 1rem;
  border: 1px dashed var(--line-strong);
  border-radius: var(--radius);
  background: rgba(8, 20, 46, .42);
}

.page-about .about-honor__item p {
  margin: 0;
  font-size: .88rem;
  line-height: 1.75;
  color: var(--on-night-soft);
}

.page-about .about-honor__item .tag {
  justify-self: start;
}

@media (min-width: 860px) {
  .page-about .about-honor {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 找到我们 ---------- */
.page-about .about-reach {
  display: grid;
  gap: clamp(1.6rem, 4vw, 3rem);
}

@media (min-width: 900px) {
  .page-about .about-reach {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr);
    align-items: start;
  }
}

.page-about .about-reach__text {
  max-width: 36rem;
}

.page-about .about-reach__text .btn {
  margin-top: 1.7rem;
}

.page-about .about-reach__card {
  padding: clamp(1.1rem, 2.5vw, 1.6rem);
  border: 1px solid var(--line);
  border-left: 2px solid var(--rape);
  border-radius: var(--radius);
  background: var(--about-card);
}

.page-about .about-contact {
  margin: 0;
  display: grid;
  gap: .9rem;
}

.page-about .about-contact__row {
  display: grid;
  gap: .2rem;
  padding-bottom: .85rem;
  border-bottom: 1px solid var(--line);
}

.page-about .about-contact__row dt {
  font-size: .72rem;
  letter-spacing: .18em;
  color: var(--haze);
}

.page-about .about-contact__row dd {
  margin: 0;
  font-size: .95rem;
  line-height: 1.7;
  color: var(--paper);
  word-break: break-word;
}

.page-about .about-contact__note {
  margin: 1rem 0 0;
  font-size: .82rem;
  line-height: 1.75;
  color: var(--on-night-soft);
}

.page-about .about-contact__more {
  margin: .9rem 0 0;
  font-size: .88rem;
  color: var(--on-night);
}

.page-about .about-contact__more a {
  color: var(--rape);
  text-decoration: underline;
  text-underline-offset: 3px;
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-tl__item,
  .page-about .about-hero__media {
    transition: none;
    transform: none;
  }
  .page-about .about-tl__item:hover,
  .page-about .about-tl__item:focus-within {
    transform: none;
  }
}