.page-about {
  background: var(--ink-900);
  color: var(--ink-text);
  overflow-x: hidden;
}

.page-about .about-h2 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.65rem, 4vw, 2.9rem);
  line-height: 1.14;
  letter-spacing: -.02em;
  color: var(--white);
  margin: .5rem 0 1rem;
  max-width: 22ch;
}

.page-about .m6-section--light .about-h2 {
  color: var(--ink-900);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  padding: clamp(2.5rem, 7vw, 5.5rem) 0 0;
  background: var(--ink-950);
}

.page-about .about-hero__media {
  position: absolute;
  inset: 0;
  z-index: -2;
}

.page-about .about-hero__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .3;
  filter: saturate(.8) contrast(1.08);
}

.page-about .about-hero__veil {
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(78% 62% at 12% 8%, rgba(18, 62, 51, .72), transparent 68%),
    radial-gradient(52% 46% at 92% 76%, rgba(47, 209, 255, .16), transparent 70%),
    linear-gradient(180deg, rgba(6, 23, 19, .62) 0%, rgba(6, 23, 19, .88) 58%, var(--ink-900) 100%);
}

.page-about .about-hero__inner {
  position: relative;
  padding-bottom: clamp(2rem, 5vw, 3.5rem);
}

.page-about .about-hero__crumb {
  margin-bottom: 1.5rem;
}

.page-about .about-hero__label {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  color: var(--amber);
  border-bottom: 2px solid var(--orange);
  padding-bottom: .35rem;
}

.page-about .about-hero__title {
  margin: 1rem 0 1.25rem;
  color: var(--white);
  max-width: 17ch;
  text-wrap: balance;
}

.page-about .about-hero__lede {
  font-family: var(--font-body);
  font-size: clamp(1rem, 1.45vw, 1.15rem);
  line-height: 1.8;
  color: var(--ink-text);
  max-width: 46ch;
  margin: 0 0 1.75rem;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0 auto;
  padding: 0 0 clamp(1.5rem, 4vw, 2.5rem);
  background: linear-gradient(90deg, rgba(232, 243, 238, .26), rgba(232, 243, 238, 0) 92%);
  background-size: 1px 100%;
  background-repeat: repeat-x;
}

.page-about .about-hero__fact {
  padding: 1.1rem 1rem 1.1rem 0;
  border-top: 1px solid var(--line);
}

.page-about .about-hero__fact dt {
  font-size: .75rem;
  letter-spacing: .1em;
  font-weight: 600;
  color: var(--muted);
  margin-bottom: .4rem;
}

.page-about .about-hero__fact dd {
  margin: 0;
  font-size: .9375rem;
  color: var(--white);
}

.page-about .about-hero__fact .m6-num {
  font-size: clamp(1.4rem, 3vw, 2rem);
  margin-right: .3rem;
}

/* ---------- 使命 ---------- */
.page-about .about-mission {
  background: var(--ink-900);
}

.page-about .about-mission__grid {
  row-gap: 2.5rem;
}

.page-about .about-mission__text {
  font-size: 1rem;
  line-height: 1.85;
  color: var(--ink-text);
  max-width: 38ch;
  margin: 0 0 1rem;
}

.page-about .about-mission__points {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: .75rem;
}

.page-about .about-mission__point {
  position: relative;
  padding: 1.15rem 1.2rem 1.15rem 1.5rem;
  background: var(--ink-800);
  border-radius: var(--r-organic);
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .about-mission__point::before {
  content: "";
  position: absolute;
  left: 0;
  top: 1.35rem;
  width: 4px;
  height: 22px;
  border-radius: 0 4px 4px 0;
  background: var(--blue);
}

.page-about .about-mission__point:hover,
.page-about .about-mission__point:focus-within {
  transform: translateY(-2px);
  box-shadow: 0 0 0 1px var(--orange), var(--shadow-card);
}

.page-about .about-mission__point-title {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 800;
  letter-spacing: -.01em;
  color: var(--white);
  margin: 0 0 .4rem;
}

.page-about .about-mission__point p {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 发展阶段 ---------- */
.page-about .about-stages__head {
  margin-bottom: clamp(1.75rem, 4vw, 3rem);
}

.page-about .about-stages__lede {
  font-family: var(--font-serif);
  font-size: clamp(1.05rem, 1.6vw, 1.25rem);
  line-height: 1.7;
  color: var(--ink-800);
  max-width: 34ch;
  margin: 0;
}

.page-about .about-stages__grid {
  row-gap: 2rem;
}

.page-about .about-rail {
  margin-bottom: 1rem;
}

.page-about .about-rail__list {
  display: flex;
  gap: .5rem;
  list-style: none;
  margin: 0;
  padding: 0 0 .5rem;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .about-rail__list::-webkit-scrollbar {
  display: none;
}

.page-about .about-rail__item {
  flex: 0 0 auto;
}

.page-about .about-rail__link {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  padding: .5rem .9rem;
  border: 1px solid rgba(11, 43, 36, .2);
  border-radius: 999px;
  background: rgba(255, 255, 255, .72);
  color: var(--ink-900);
  font-size: .8125rem;
  font-weight: 600;
  text-decoration: none;
  white-space: nowrap;
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease), transform var(--dur) var(--ease);
}

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

.page-about .about-rail__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--blue);
  flex: none;
}

.page-about .about-rail__no {
  font-size: .75rem;
  color: var(--muted);
}

.page-about .about-rail__item[data-current] .about-rail__link {
  border-color: var(--orange);
  background: var(--white);
  box-shadow: inset 0 0 0 1px var(--orange);
}

.page-about .about-rail__item[data-current] .about-rail__dot {
  background: var(--orange);
  box-shadow: 0 0 0 4px rgba(255, 106, 19, .18);
}

.page-about .about-rail__item[data-current] .about-rail__no {
  color: var(--orange);
}

.page-about .about-stages__body {
  display: grid;
  gap: clamp(1rem, 2.5vw, 1.5rem);
}

.page-about .about-stage {
  position: relative;
  padding: clamp(1.35rem, 3vw, 2.25rem);
  background: var(--white);
  border-radius: var(--r-organic);
  box-shadow: var(--shadow-card);
  scroll-margin-top: 6.5rem;
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .about-stage:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 0 1px var(--orange), var(--shadow-card);
}

.page-about .about-stage .m6-label {
  color: var(--orange);
  margin: 0;
}

.page-about .about-stage__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.4rem, 3.2vw, 2.15rem);
  line-height: 1.18;
  letter-spacing: -.02em;
  color: var(--ink-900);
  margin: .5rem 0 .9rem;
}

.page-about .about-stage__text {
  font-size: .9688rem;
  line-height: 1.8;
  color: #33564c;
  max-width: 38ch;
  margin: 0 0 .85rem;
}

.page-about .about-stage__tag {
  display: inline-block;
  margin-top: .5rem;
}

/* ---------- 内容协作 ---------- */
.page-about .about-partners {
  background: var(--ink-950);
}

.page-about .about-partners__grid {
  row-gap: 2.25rem;
  align-items: start;
}

.page-about .about-partners__text {
  font-size: 1rem;
  line-height: 1.85;
  color: var(--ink-text);
  max-width: 38ch;
  margin: 0 0 1.5rem;
}

.page-about .about-partners__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1rem;
}

.page-about .about-partners__item {
  padding-left: 1.15rem;
  border-left: 2px solid var(--line-strong);
  transition: border-color var(--dur) var(--ease);
}

.page-about .about-partners__item:hover,
.page-about .about-partners__item:focus-within {
  border-left-color: var(--orange);
}

.page-about .about-partners__item-title {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 800;
  color: var(--amber);
  margin: 0 0 .35rem;
}

.page-about .about-partners__item p {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.75;
  color: var(--muted);
}

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

/* ---------- 服务规模 ---------- */
.page-about .about-scale__head {
  margin-bottom: clamp(1.75rem, 4vw, 2.75rem);
}

.page-about .about-scale__lede {
  font-size: 1rem;
  line-height: 1.85;
  color: #33564c;
  max-width: 46ch;
  margin: 0;
}

.page-about .about-scale__grid {
  row-gap: 2rem;
  align-items: start;
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: .875rem;
}

.page-about .about-stat {
  position: relative;
  padding: 1.25rem 1.15rem;
  background: var(--white);
  border: 1px solid rgba(11, 43, 36, .12);
  border-radius: var(--r-soft);
  outline: none;
  scroll-margin-top: 6rem;
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .about-stat:hover,
.page-about .about-stat:focus-visible,
.page-about .about-stat:focus-within {
  border-color: var(--orange);
  transform: translateY(-2px);
}

.page-about .about-stat:focus-visible {
  box-shadow: 0 0 0 2px var(--blue), 0 0 0 4px var(--ink-950);
}

.page-about .about-stat__num {
  margin: 0;
  font-size: clamp(1.75rem, 4.4vw, 2.4rem);
  font-weight: 700;
  color: var(--orange);
  line-height: 1;
}

.page-about .about-stat__unit {
  font-size: .875rem;
  font-weight: 600;
  color: var(--ink-800);
  margin-left: .3rem;
}

.page-about .about-stat__label {
  margin: .5rem 0 0;
  font-size: .875rem;
  font-weight: 600;
  color: var(--ink-900);
}

.page-about .about-stat__note {
  position: absolute;
  left: 0;
  right: 0;
  bottom: calc(100% + .5rem);
  padding: .7rem .85rem;
  font-size: .75rem;
  line-height: 1.6;
  color: var(--ink-text);
  background: var(--ink-950);
  border: 1px solid var(--line-strong);
  border-radius: 12px;
  opacity: 0;
  transform: translateY(4px);
  pointer-events: none;
  transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease);
  z-index: 4;
}

.page-about .about-stat:hover .about-stat__note,
.page-about .about-stat:focus-visible .about-stat__note,
.page-about .about-stat:focus-within .about-stat__note {
  opacity: 1;
  transform: none;
}

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

/* ---------- 四条做法 ---------- */
.page-about .about-ways {
  background: var(--ink-900);
}

.page-about .about-ways__head {
  margin-bottom: clamp(1.5rem, 3.5vw, 2.5rem);
}

.page-about .about-ways__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line);
}

.page-about .about-ways__item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 1rem;
  padding: clamp(1.25rem, 3vw, 1.9rem) 0;
  border-bottom: 1px solid var(--line);
  transition: background var(--dur) var(--ease), padding-left var(--dur) var(--ease);
}

.page-about .about-ways__item:hover {
  background: linear-gradient(90deg, rgba(255, 106, 19, .09), transparent 62%);
  padding-left: .75rem;
}

.page-about .about-ways__no {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--amber);
  padding-top: .2rem;
}

.page-about .about-ways__title {
  font-family: var(--font-display);
  font-size: clamp(1.1rem, 2.2vw, 1.4rem);
  font-weight: 800;
  letter-spacing: -.01em;
  color: var(--white);
  margin: 0 0 .5rem;
}

.page-about .about-ways__body p {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.8;
  color: var(--muted);
  max-width: 52ch;
}

/* ---------- 下一步 ---------- */
.page-about .about-next {
  background:
    radial-gradient(70% 80% at 88% 0%, rgba(255, 106, 19, .16), transparent 62%),
    var(--ink-950);
  padding-bottom: clamp(3rem, 7vw, 5rem);
}

.page-about .about-next__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1rem;
  margin: 1.75rem 0 1.5rem;
}

.page-about .about-next__card {
  background: var(--ink-800);
  border: 1px solid var(--line);
  border-radius: var(--r-organic);
  padding: 1.5rem 1.35rem;
  display: flex;
  flex-direction: column;
  gap: .75rem;
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-next__card:hover,
.page-about .about-next__card:focus-within {
  transform: translateY(-2px);
  border-color: var(--orange);
  box-shadow: var(--shadow-card);
}

.page-about .about-next__card .m6-card__body {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-next__card .m6-card__foot {
  margin: auto 0 0;
}

.page-about .about-next__note {
  font-size: .875rem;
  line-height: 1.8;
  color: var(--muted);
  max-width: 60ch;
  margin: 0;
}

.page-about .about-next__note a {
  color: var(--blue);
  text-decoration: underline;
  text-underline-offset: .2em;
}

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

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

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

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

@media (min-width: 900px) {
  .page-about .about-stages__grid {
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: 7.5rem;
    margin-bottom: 0;
  }

  .page-about .about-rail__list {
    display: block;
    overflow: visible;
    padding: 0 0 0 1.6rem;
    border-left: 2px solid rgba(11, 43, 36, .16);
  }

  .page-about .about-rail__item {
    position: relative;
    margin-bottom: 2.5rem;
  }

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

  .page-about .about-rail__link {
    flex-direction: column;
    align-items: flex-start;
    gap: .35rem;
    padding: 0;
    border: 0;
    border-radius: 0;
    background: none;
    font-size: .9375rem;
    white-space: normal;
  }

  .page-about .about-rail__link:hover,
  .page-about .about-rail__link:focus-visible {
    background: none;
    transform: none;
    color: var(--orange);
  }

  .page-about .about-rail__dot {
    position: absolute;
    left: -1.6rem;
    top: .45rem;
    transform: translateX(-50%);
    width: 10px;
    height: 10px;
    box-shadow: 0 0 0 4px var(--mist);
  }

  .page-about .about-rail__item[data-current] .about-rail__dot {
    animation: about-pulse 2.8s ease-in-out infinite;
  }

  .page-about .about-rail__no {
    font-size: .6875rem;
    letter-spacing: .08em;
  }

  .page-about .about-rail__text {
    font-weight: 700;
    color: var(--ink-900);
  }

  .page-about .about-rail__item[data-current] .about-rail__link {
    box-shadow: none;
    background: none;
  }

  .page-about .about-rail__item[data-current] .about-rail__text {
    color: var(--orange);
  }

  .page-about .about-stages__body {
    gap: 2rem;
  }

  .page-about .about-partners__grid {
    align-items: center;
  }
}

@media (min-width: 1100px) {
  .page-about .about-mission__grid {
    column-gap: 3rem;
  }

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

  .page-about .about-hero__inner {
    padding-bottom: 3rem;
  }
}

@keyframes about-pulse {
  0%, 100% { box-shadow: 0 0 0 4px var(--mist), 0 0 0 4px rgba(255, 106, 19, .22); }
  50% { box-shadow: 0 0 0 4px var(--mist), 0 0 0 9px rgba(255, 106, 19, .06); }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-rail__item[data-current] .about-rail__dot {
    animation: none;
  }

  .page-about .about-mission__point,
  .page-about .about-stage,
  .page-about .about-stat,
  .page-about .about-next__card,
  .page-about .about-rail__link,
  .page-about .about-ways__item {
    transition: none;
  }
}