.page-about {
  --about-col: 232px;
  --about-gap: clamp(32px, 4vw, 64px);
  --about-band-radius: var(--radius-xl);
  display: block;
}

/* 面包屑 */
.page-about .about-crumbs {
  padding-block: 18px 2px;
}

/* ============ 首屏 ============ */
.page-about .about-hero {
  position: relative;
  padding-block: clamp(24px, 5vw, 56px) clamp(40px, 7vw, 88px);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background:
    radial-gradient(920px 520px at 16% 4%, rgba(255, 90, 31, 0.16), transparent 62%),
    radial-gradient(720px 460px at 88% 24%, rgba(25, 195, 125, 0.1), transparent 66%);
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 5vw, 56px);
}

.page-about .about-hero__main h1 {
  margin: 14px 0 0;
}

.page-about .about-hero__main .lead {
  margin-top: clamp(16px, 2.4vw, 24px);
  max-width: 60ch;
}

.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 20px;
  margin-top: clamp(26px, 4vw, 42px);
  padding-top: 24px;
  border-top: 1px solid var(--line);
}

.page-about .about-fact {
  display: flex;
  flex-direction: column;
  gap: 7px;
  min-width: 0;
}

.page-about .about-fact__num {
  font-size: clamp(1.5rem, 3vw, 2.1rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--amber);
}

.page-about .about-fact__label {
  font-size: 13px;
  line-height: 1.55;
  color: var(--muted);
}

.page-about .about-hero__aside {
  display: flex;
  align-items: flex-start;
  gap: 18px;
  min-width: 0;
}

.page-about .about-hero__aside .vertical-note {
  display: none;
}

.page-about .about-hero__card {
  flex: 1 1 auto;
  min-width: 0;
  padding: clamp(20px, 3vw, 30px);
  border-radius: var(--radius-xl);
  background: linear-gradient(158deg, var(--ink-700), var(--ink-900) 78%);
  box-shadow: inset 0 1px 0 rgba(232, 237, 247, 0.06);
}

.page-about .about-hero__card-title {
  margin: 0;
  font-size: 13px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--orange-soft);
}

.page-about .about-hero__stat {
  display: grid;
  gap: 0;
  margin: 18px 0 0;
}

.page-about .about-hero__stat > div {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px 14px;
  padding-block: 11px;
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero__stat > div:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .about-hero__stat dt {
  font-size: 14px;
  color: var(--muted);
}

.page-about .about-hero__stat dd {
  margin: 0;
  font-size: 15px;
  font-weight: 700;
  color: var(--white);
}

.page-about .about-hero__card .btn {
  margin-top: 22px;
}

/* ============ 主体框架 ============ */
.page-about .about-frame {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(40px, 6vw, 64px);
  padding-block: clamp(36px, 6vw, 80px) clamp(48px, 8vw, 104px);
}

/* 章节目录 */
.page-about .about-toc__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 12px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-toc__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 14px;
  border-radius: var(--pill);
  background: rgba(147, 164, 196, 0.09);
  color: var(--muted);
  font-size: 13px;
  text-decoration: none;
  transition: color var(--dur-fast) var(--ease), background var(--dur-fast) var(--ease);
}

.page-about .about-toc__dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: currentColor;
  flex: 0 0 auto;
}

.page-about .about-toc__link:hover,
.page-about .about-toc__link:focus-visible {
  color: var(--white);
  background: rgba(255, 90, 31, 0.18);
}

/* 正文流 */
.page-about .about-flow {
  display: grid;
  gap: clamp(64px, 9vw, 116px);
  min-width: 0;
}

.page-about .about-chapter {
  scroll-margin-top: var(--top-offset);
  min-width: 0;
}

.page-about .about-chapter__head {
  margin-bottom: clamp(18px, 3vw, 30px);
}

.page-about .about-chapter__head::after {
  content: "";
  display: block;
  width: 56px;
  height: 2px;
  margin-top: 18px;
  background: linear-gradient(90deg, var(--orange), rgba(255, 90, 31, 0));
}

.page-about .about-chapter__num {
  margin: 0 0 12px;
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--orange);
}

.page-about .about-chapter__head h2 {
  margin: 0;
}

.page-about .about-chapter__body {
  display: grid;
  gap: 16px;
}

.page-about .about-chapter__body p {
  margin: 0;
  max-width: 68ch;
}

.page-about .about-chapter > p {
  max-width: 68ch;
}

.page-about .media-figure {
  margin: clamp(22px, 4vw, 38px) 0 0;
}

.page-about .media-figure .media-frame__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

/* ============ 团队信息带 ============ */
.page-about .crew-band {
  list-style: none;
  margin: clamp(24px, 4vw, 36px) 0 0;
  padding: 0;
}

.page-about .crew-band__item {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px 22px;
  padding: 20px 0 20px 24px;
  border-top: 1px solid var(--line);
}

.page-about .crew-band__item:last-child {
  border-bottom: 1px solid var(--line);
}

.page-about .crew-band__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 26px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--orange);
  box-shadow: 0 0 0 4px rgba(255, 90, 31, 0.16);
}

.page-about .crew-band__count {
  font-size: clamp(1.4rem, 2.6vw, 1.9rem);
  font-weight: 700;
  line-height: 1;
  color: var(--amber);
}

.page-about .crew-band__count::after {
  content: "人";
  margin-left: 5px;
  font-size: 12px;
  font-weight: 500;
  color: var(--muted);
}

.page-about .crew-band__name {
  font-weight: 700;
  color: var(--white);
}

.page-about .crew-band__desc {
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted);
}

/* ============ 生产步骤 ============ */
.page-about .pipe-steps {
  list-style: none;
  margin: clamp(24px, 4vw, 36px) 0 0;
  padding: 0;
}

.page-about .pipe-step {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px 24px;
  padding: 22px 0;
  border-top: 1px solid var(--line);
}

.page-about .pipe-step:last-child {
  border-bottom: 1px solid var(--line);
}

.page-about .pipe-step__idx {
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--orange);
}

.page-about .pipe-step h3 {
  margin: 0;
  font-size: 1.05rem;
  color: var(--white);
}

.page-about .pipe-step p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted);
}

/* ============ 批次满幅带 ============ */
.page-about .about-band {
  position: relative;
  overflow: hidden;
  margin-inline: calc(-1 * var(--gutter));
  padding: clamp(28px, 4.5vw, 52px) var(--gutter);
  border-radius: var(--about-band-radius);
  background:
    linear-gradient(102deg, rgba(255, 90, 31, 0.16), rgba(59, 30, 90, 0.45) 46%, rgba(7, 20, 39, 0.92) 100%);
}

.page-about .about-band::after {
  content: "";
  position: absolute;
  top: -90px;
  right: -70px;
  width: 320px;
  height: 320px;
  border-radius: 50%;
  border: 1px solid rgba(255, 138, 91, 0.32);
  pointer-events: none;
}

.page-about .about-band h2 {
  margin: 10px 0 0;
  max-width: 24ch;
}

.page-about .about-band__lead {
  margin: clamp(16px, 2.4vw, 22px) 0 0;
  max-width: 68ch;
  color: var(--white);
  opacity: 0.86;
  line-height: 1.75;
}

.page-about .batch-strip {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(24px, 4vw, 36px) 0 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--line);
}

.page-about .batch-strip__item {
  display: flex;
  flex-direction: column;
  gap: 9px;
  padding: 18px 20px;
  background: rgba(7, 20, 39, 0.74);
  min-width: 0;
}

.page-about .batch-strip__item dt {
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--muted);
}

.page-about .batch-strip__item dd {
  margin: 0;
  font-size: 15px;
  font-weight: 700;
  color: var(--white);
}

.page-about .batch-strip__item:first-child dd {
  color: var(--amber);
  font-size: 1.3rem;
  letter-spacing: -0.01em;
}

.page-about .about-band__foot {
  margin: clamp(18px, 3vw, 26px) 0 0;
  font-size: 14px;
  color: var(--muted);
}

.page-about .about-band__foot a {
  color: var(--orange-soft);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 138, 91, 0.45);
}

.page-about .about-band__foot a:hover,
.page-about .about-band__foot a:focus-visible {
  color: var(--white);
  border-bottom-color: var(--white);
}

/* ============ 协作生态 ============ */
.page-about .eco-points {
  display: grid;
  gap: 0;
  margin-top: clamp(24px, 4vw, 34px);
}

.page-about .eco-point {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 8px 26px;
  padding: 18px 0;
  border-top: 1px solid var(--line);
}

.page-about .eco-point:last-child {
  border-bottom: 1px solid var(--line);
}

.page-about .eco-point h3 {
  margin: 0;
  font-size: 1.02rem;
  color: var(--white);
}

.page-about .eco-point p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted);
}

/* ============ 里程碑时间带 ============ */
.page-about .milestones {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(240px, 1fr);
  gap: 0;
  margin: 0;
  padding: 0 0 14px;
  list-style: none;
  overflow-x: auto;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
}

.page-about .milestone {
  position: relative;
  scroll-snap-align: start;
  padding: 28px 22px 0 22px;
  border-top: 1px solid var(--line-strong);
  min-width: 0;
}

.page-about .milestone::before {
  content: "";
  position: absolute;
  top: -5px;
  left: 22px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--orange);
  box-shadow: 0 0 0 4px rgba(255, 90, 31, 0.18);
  transition: background var(--dur-fast) var(--ease), box-shadow var(--dur-fast) var(--ease);
}

.page-about .milestone:hover::before,
.page-about .milestone:focus-within::before {
  background: var(--amber);
  box-shadow: 0 0 0 6px rgba(245, 176, 65, 0.2);
}

.page-about .milestone__year {
  display: block;
  margin-bottom: 12px;
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--white);
  transition: color var(--dur-fast) var(--ease);
}

.page-about .milestone:hover .milestone__year {
  color: var(--amber);
}

.page-about .milestone__title {
  margin: 0 0 10px;
  font-size: 1rem;
  color: var(--white);
}

.page-about .milestone__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

/* ============ 页面收口 ============ */
.page-about .about-cta {
  padding-block: clamp(8px, 2vw, 24px) clamp(56px, 8vw, 108px);
}

.page-about .about-cta__inner {
  padding: clamp(28px, 4.5vw, 48px);
  border-radius: var(--radius-xl);
  background:
    linear-gradient(124deg, rgba(255, 90, 31, 0.16), rgba(11, 30, 58, 0.28) 58%, rgba(25, 195, 125, 0.14));
}

.page-about .about-cta__inner h2 {
  margin: 0;
}

.page-about .about-cta__inner p {
  margin: 14px 0 0;
  max-width: 60ch;
  color: var(--muted);
}

.page-about .about-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

/* ============ 断点 ============ */
@media (min-width: 640px) {
  .page-about .about-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

@media (min-width: 720px) {
  .page-about .crew-band__item {
    grid-template-columns: 92px 130px minmax(0, 1fr);
    align-items: baseline;
  }

  .page-about .pipe-step {
    grid-template-columns: 48px 176px minmax(0, 1fr);
    align-items: baseline;
  }

  .page-about .eco-point {
    grid-template-columns: 200px minmax(0, 1fr);
    align-items: baseline;
  }
}

@media (min-width: 768px) {
  .page-about .about-hero__aside .vertical-note {
    display: block;
  }
}

@media (min-width: 1024px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
    column-gap: clamp(36px, 5vw, 72px);
  }

  .page-about .about-frame {
    grid-template-columns: var(--about-col) minmax(0, 1fr);
    column-gap: var(--about-gap);
    align-items: start;
  }

  .page-about .about-toc {
    grid-column: 1;
    grid-row: 1 / span 3;
    position: sticky;
    top: var(--top-offset);
  }

  .page-about .about-flow--first {
    grid-column: 2;
    grid-row: 1;
  }

  .page-about .about-band {
    grid-column: 1 / -1;
    grid-row: 2;
  }

  .page-about .about-flow--last {
    grid-column: 2;
    grid-row: 3;
  }

  .page-about .about-toc__list {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 0;
    margin-top: 16px;
  }

  .page-about .about-toc__link {
    width: 100%;
    padding: 10px 0 10px 16px;
    border-radius: 0;
    border-left: 2px solid var(--line);
    background: none;
  }

  .page-about .about-toc__link:hover,
  .page-about .about-toc__link:focus-visible {
    background: none;
    border-left-color: var(--orange);
    color: var(--white);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-toc__link,
  .page-about .milestone::before,
  .page-about .milestone__year {
    transition: none;
  }
}