.page-about {
  --about-shadow: 0 18px 44px rgba(14, 58, 76, 0.16);
  --about-soft: 0 6px 18px rgba(14, 58, 76, 0.08);
  background: var(--paper);
  color: var(--ink);
  overflow-x: clip;
}

.page-about .about-wrap {
  width: min(100% - 32px, var(--shell));
  margin-inline: auto;
}

.page-about .about-block {
  padding-block: var(--sp-6);
}

.page-about .about-top {
  width: min(100% - 32px, var(--shell));
  margin-inline: auto;
  padding-block: var(--sp-3);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-2);
}

.page-about .about-jump {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  align-items: center;
}

.page-about .about-jump__link {
  display: inline-block;
  padding: 6px 14px;
  border-radius: var(--r-pill);
  border: 1px solid transparent;
  background: var(--sand-200);
  color: var(--lake-900);
  font-size: var(--fs-13);
  font-weight: 600;
  text-decoration: none;
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .about-jump__link:hover,
.page-about .about-jump__link:focus-visible {
  background: var(--white);
  border-color: var(--sand-500);
  transform: translateY(-2px);
}

.page-about .about-jump__link--key {
  background: var(--lake-900);
  color: var(--paper);
}

.page-about .about-jump__link--key:hover,
.page-about .about-jump__link--key:focus-visible {
  background: var(--lake-700);
  color: var(--white);
  border-color: var(--celadon-400);
}

/* 主张区 */
.page-about .about-hero {
  margin-top: var(--sp-2);
  background:
    radial-gradient(90% 70% at 88% 4%, rgba(224, 138, 60, 0.24), transparent 62%),
    linear-gradient(158deg, var(--indigo-900) 0%, var(--lake-900) 100%);
  color: var(--paper);
  border-radius: 0 0 var(--r-xl) var(--r-xl);
}

.page-about .about-hero__inner {
  width: min(100% - 32px, var(--shell));
  margin-inline: auto;
  padding-block: var(--sp-6) var(--sp-7);
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--sp-5);
}

.page-about .about-hero__eyebrow {
  margin: 0 0 var(--sp-2);
  font-family: var(--font-editorial);
  font-size: var(--fs-15);
  letter-spacing: 0.08em;
  color: var(--sand-200);
}

.page-about .about-hero h1 {
  margin: 0 0 var(--sp-3);
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(var(--fs-40), 7.2vw, var(--fs-72));
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: var(--white);
}

.page-about .about-hero__lede {
  margin: 0 0 var(--sp-4);
  max-width: 34em;
  font-size: var(--fs-17);
  line-height: 1.75;
  color: rgba(251, 247, 241, 0.86);
}

.page-about .about-hero__quote {
  margin: 0;
  padding-left: var(--sp-3);
  border-left: 3px solid var(--sand-500);
  font-family: var(--font-editorial);
  font-size: var(--fs-22);
  line-height: 1.6;
  color: var(--sand-200);
}

.page-about .about-hero__quote::first-letter {
  float: left;
  font-size: 3.1em;
  line-height: 0.86;
  padding-right: 10px;
  padding-top: 4px;
  color: var(--sand-500);
}

.page-about .about-hero__media {
  position: relative;
}

.page-about .about-hero__frame {
  border-radius: var(--r-xl) var(--r-xl) var(--r-xl) 96px;
  overflow: hidden;
  transform: rotate(-2deg);
  box-shadow: var(--about-shadow);
  background: var(--lake-700);
}

.page-about .about-hero__img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 14 / 9;
  object-fit: cover;
  clip-path: polygon(0 5%, 100% 0, 100% 95%, 0 100%);
}

/* 通用标题 */
.page-about .about-head {
  max-width: 46em;
  margin-bottom: var(--sp-4);
}

.page-about .about-kicker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 var(--sp-2);
  font-family: var(--font-editorial);
  font-size: var(--fs-15);
  letter-spacing: 0.06em;
  color: var(--sand-700);
}

.page-about .about-kicker::before {
  content: "";
  width: 26px;
  height: 2px;
  background: var(--sand-500);
}

.page-about .about-kicker--light {
  color: var(--sand-200);
}

.page-about .about-kicker--light::before {
  background: var(--celadon-400);
}

.page-about h2 {
  margin: 0 0 var(--sp-2);
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(var(--fs-30), 4.6vw, var(--fs-40));
  line-height: 1.18;
  letter-spacing: -0.01em;
  color: var(--lake-900);
}

.page-about .about-lede {
  margin: 0;
  font-size: var(--fs-17);
  line-height: 1.75;
  color: var(--slate);
}

.page-about .about-link {
  color: var(--sand-700);
  text-decoration: none;
  border-bottom: 2px solid var(--celadon-400);
  padding-bottom: 1px;
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-about .about-link:hover,
.page-about .about-link:focus-visible {
  color: var(--lake-900);
  border-bottom-color: var(--sand-500);
}

/* 团队 */
.page-about .about-team {
  background: var(--paper);
}

.page-about .about-team__media {
  margin-bottom: var(--sp-4);
}

.page-about .about-team__img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 12 / 7;
  object-fit: cover;
  border-radius: var(--r-lg);
  box-shadow: var(--about-soft);
}

.page-about .about-team__grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--sp-2);
}

.page-about .about-role {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: var(--sp-3);
  min-height: 176px;
  padding: var(--sp-3) var(--sp-2);
  border-radius: var(--r-lg);
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .about-role:hover,
.page-about .about-role:focus-within {
  transform: translateY(-4px);
  box-shadow: var(--about-shadow);
}

.page-about .about-role__count {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: var(--fs-30);
  line-height: 1;
  font-variant-numeric: tabular-nums;
}

.page-about .about-role__name {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: var(--fs-22);
  line-height: 1.2;
}

.page-about .about-role__duty {
  margin: 0;
  font-size: var(--fs-15);
  line-height: 1.65;
}

.page-about .about-role--editor {
  background: var(--indigo-900);
  color: var(--paper);
}

.page-about .about-role--editor .about-role__count {
  color: var(--sand-500);
}

.page-about .about-role--editor .about-role__duty {
  color: rgba(251, 247, 241, 0.78);
}

.page-about .about-role--check {
  background: var(--lake-700);
  color: var(--paper);
}

.page-about .about-role--check .about-role__count {
  color: var(--celadon-400);
}

.page-about .about-role--check .about-role__duty {
  color: rgba(251, 247, 241, 0.78);
}

.page-about .about-role--product {
  background: var(--sand-200);
  color: var(--lake-900);
}

.page-about .about-role--product .about-role__count {
  color: var(--sand-700);
}

.page-about .about-role--product .about-role__duty {
  color: var(--slate);
}

.page-about .about-role--service {
  background: var(--wine-800);
  color: var(--paper);
}

.page-about .about-role--service .about-role__count {
  color: var(--sand-200);
}

.page-about .about-role--service .about-role__duty {
  color: rgba(251, 247, 241, 0.78);
}

/* 上线流程 */
.page-about .about-process {
  background: var(--sand-200);
  border-radius: var(--r-xl);
  width: min(100% - 32px, var(--shell));
  margin-inline: auto;
  padding-inline: var(--sp-3);
}

.page-about .about-process .about-wrap {
  width: 100%;
}

.page-about .about-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--sp-2);
}

.page-about .about-steps__item {
  position: relative;
  padding: var(--sp-3);
  background: var(--white);
  border-radius: var(--r-md);
  border-top: 3px solid var(--sand-500);
}

.page-about .about-steps__num {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: var(--fs-22);
  font-variant-numeric: tabular-nums;
  color: var(--celadon-400);
}

.page-about .about-steps__title {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: var(--fs-17);
  color: var(--lake-900);
}

.page-about .about-steps__text {
  margin: 0;
  font-size: var(--fs-15);
  line-height: 1.7;
  color: var(--slate);
}

.page-about .about-process__loop {
  margin-top: var(--sp-4);
  padding: var(--sp-3);
  background: rgba(255, 255, 255, 0.72);
  border-left: 3px solid var(--celadon-400);
  border-radius: 0 var(--r-md) var(--r-md) 0;
}

.page-about .about-process__loop p {
  margin: 8px 0 0;
  font-size: var(--fs-15);
  line-height: 1.7;
  color: var(--ink);
}

/* 版本 */
.page-about .about-versions {
  background: var(--paper);
}

.page-about .about-versions__layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--sp-4);
}

.page-about .about-versions__label {
  margin: 0 0 var(--sp-2);
  font-family: var(--font-editorial);
  font-size: var(--fs-15);
  letter-spacing: 0.06em;
  color: var(--sand-700);
}

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

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 10px;
  top: 12px;
  bottom: 12px;
  width: 2px;
  background: linear-gradient(var(--celadon-400), var(--sand-200));
}

.page-about .about-timeline__item {
  position: relative;
  margin: 0;
}

.page-about .about-timeline__link {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 8px 8px 8px 0;
  font-family: var(--font-editorial);
  font-size: var(--fs-15);
  line-height: 1.4;
  color: var(--slate);
  text-decoration: none;
  transition: color var(--dur) var(--ease);
}

.page-about .about-timeline__link::before {
  content: "";
  flex: 0 0 auto;
  width: 12px;
  height: 12px;
  margin-left: 3px;
  border-radius: 50%;
  background: var(--paper);
  border: 2px solid var(--celadon-400);
  box-sizing: content-box;
  z-index: 1;
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .about-timeline__link:hover,
.page-about .about-timeline__link:focus-visible {
  color: var(--lake-900);
}

.page-about .about-timeline__link.is-active {
  color: var(--lake-900);
  font-weight: 600;
}

.page-about .about-timeline__link.is-active::before {
  background: var(--sand-500);
  border-color: var(--sand-500);
  box-shadow: 0 0 0 4px rgba(224, 138, 60, 0.22);
}

.page-about .about-version {
  padding: var(--sp-3);
  margin-bottom: var(--sp-3);
  background: var(--white);
  border-radius: var(--r-lg);
  border-left: 4px solid var(--celadon-400);
  box-shadow: var(--about-soft);
}

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

.page-about .about-version h3 {
  margin: var(--sp-2) 0 8px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: var(--fs-22);
  line-height: 1.25;
  color: var(--lake-900);
}

.page-about .about-version p {
  margin: 0;
  font-size: var(--fs-17);
  line-height: 1.75;
  color: var(--slate);
}

.page-about .about-version--current {
  border-left-color: var(--sand-500);
  background: linear-gradient(180deg, var(--sand-200) 0%, var(--white) 46%);
}

/* 合作生态 */
.page-about .about-partners {
  background:
    radial-gradient(70% 90% at 12% 0%, rgba(224, 138, 60, 0.22), transparent 60%),
    var(--lake-900);
  color: var(--paper);
  border-radius: var(--r-xl);
  width: min(100% - 32px, var(--shell));
  margin-inline: auto;
  padding-inline: var(--sp-3);
}

.page-about .about-partners .about-wrap {
  width: 100%;
}

.page-about .about-partners__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--sp-4);
}

.page-about .about-partners__img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 10 / 7;
  object-fit: cover;
  border-radius: var(--r-lg) var(--r-lg) 96px var(--r-lg);
  box-shadow: 0 20px 48px rgba(0, 0, 0, 0.28);
}

.page-about .about-partners h2 {
  color: var(--white);
}

.page-about .about-partners__lede {
  margin: 0 0 var(--sp-3);
  font-size: var(--fs-17);
  line-height: 1.75;
  color: rgba(251, 247, 241, 0.84);
}

.page-about .about-partners__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--sp-2);
}

.page-about .about-partners__list li {
  padding-top: var(--sp-2);
  border-top: 1px solid rgba(127, 179, 163, 0.42);
}

.page-about .about-partners__list h3 {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: var(--fs-17);
  color: var(--sand-200);
}

.page-about .about-partners__list p {
  margin: 0;
  font-size: var(--fs-15);
  line-height: 1.7;
  color: rgba(251, 247, 241, 0.78);
}

.page-about .about-partners__more {
  margin: var(--sp-4) 0 0;
}

.page-about .about-partners .about-link {
  color: var(--sand-200);
  border-bottom-color: var(--sand-500);
}

.page-about .about-partners .about-link:hover,
.page-about .about-partners .about-link:focus-visible {
  color: var(--white);
}

/* 覆盖与联系 */
.page-about .about-coverage {
  background: var(--paper);
}

.page-about .about-coverage__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--sp-4);
}

.page-about .about-coverage__copy p {
  margin: 0 0 var(--sp-2);
  font-size: var(--fs-17);
  line-height: 1.75;
  color: var(--slate);
}

.page-about .about-coverage__stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--sp-2);
}

.page-about .about-stat {
  padding: var(--sp-3) var(--sp-2);
  background: var(--white);
  border-radius: var(--r-md);
  border-bottom: 3px solid var(--celadon-400);
}

.page-about .about-stat__num {
  display: block;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: var(--fs-30);
  line-height: 1;
  font-variant-numeric: tabular-nums;
  color: var(--lake-900);
}

.page-about .about-stat__unit {
  display: block;
  margin-top: 4px;
  font-size: var(--fs-15);
  font-weight: 600;
  color: var(--sand-700);
}

.page-about .about-stat__label {
  display: block;
  margin-top: 6px;
  font-size: var(--fs-13);
  line-height: 1.5;
  color: var(--slate);
}

.page-about .about-coverage__contact {
  margin-top: var(--sp-5);
  padding: var(--sp-4) var(--sp-3);
  background: var(--indigo-900);
  color: var(--paper);
  border-radius: var(--r-lg);
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--sp-3);
}

.page-about .about-coverage__contact h3 {
  margin: 0 0 var(--sp-2);
  font-family: var(--font-display);
  font-weight: 900;
  font-size: var(--fs-22);
  color: var(--white);
}

.page-about .about-coverage__contact p {
  margin: 0;
  font-size: var(--fs-15);
  line-height: 1.75;
  color: rgba(251, 247, 241, 0.82);
}

.page-about .about-coverage__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-2);
  align-self: start;
}

.page-about .about-coverage__actions .btn {
  flex: 1 1 auto;
  text-align: center;
}

.page-about .to-top {
  position: fixed;
  right: 16px;
  bottom: 16px;
  z-index: 20;
  padding: 10px 16px;
  border-radius: var(--r-pill);
  border: 1px solid var(--celadon-400);
  background: var(--lake-900);
  color: var(--paper);
  font-size: var(--fs-13);
  font-weight: 600;
  cursor: pointer;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--dur-slow) var(--ease), background var(--dur) var(--ease);
}

.page-about .to-top[data-visible] {
  opacity: 1;
  pointer-events: auto;
}

.page-about .to-top:hover,
.page-about .to-top:focus-visible {
  background: var(--lake-700);
}

@media (min-width: 720px) {
  .page-about .about-process,
  .page-about .about-partners {
    width: min(100% - 48px, var(--shell));
    padding-inline: var(--sp-5);
  }

  .page-about .about-team__grid {
    grid-template-columns: 2fr 2fr 1.5fr 1.5fr;
    gap: var(--sp-3);
  }

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

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

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: 1.05fr 0.95fr;
    align-items: center;
    gap: var(--sp-6);
  }

  .page-about .about-steps {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: var(--sp-3);
  }

  .page-about .about-steps__item:not(:last-child)::after {
    content: "";
    position: absolute;
    top: 46px;
    right: -20px;
    width: 16px;
    height: 2px;
    background: var(--celadon-400);
  }

  .page-about .about-versions__layout {
    grid-template-columns: 268px minmax(0, 1fr);
    gap: var(--sp-6);
    align-items: start;
  }

  .page-about .about-versions__aside {
    position: sticky;
    top: var(--sp-3);
  }

  .page-about .about-partners__inner {
    grid-template-columns: 0.85fr 1.15fr;
    gap: var(--sp-5);
    align-items: start;
  }

  .page-about .about-coverage__grid {
    grid-template-columns: 1.1fr 0.9fr;
    gap: var(--sp-5);
    align-items: start;
  }

  .page-about .about-coverage__contact {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    padding: var(--sp-5) var(--sp-4);
  }

  .page-about .about-coverage__actions .btn {
    flex: 0 0 auto;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-role,
  .page-about .about-jump__link,
  .page-about .about-hero__frame {
    transform: none;
  }

  .page-about .about-role,
  .page-about .about-jump__link,
  .page-about .about-timeline__link::before,
  .page-about .to-top {
    transition-property: opacity, background-color, border-color, box-shadow;
  }
}