.page-about {
  --about-rail-w: 268px;
  --about-rule: rgba(159, 196, 192, .22);
  --about-rule-dark: rgba(11, 20, 24, .14);
  --about-ink-soft: #43535A;
  display: block;
  background: var(--ink);
  color: var(--white);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(1.25rem, 3.4vw, 2.25rem) 0 clamp(2.25rem, 5.5vw, 4.5rem);
  background:
    radial-gradient(115% 130% at 6% -14%, rgba(36, 96, 92, .78) 0%, rgba(11, 20, 24, 0) 62%),
    linear-gradient(168deg, #0B1418 0%, #12332F 56%, #0B1418 100%);
  border-bottom: 1px solid var(--about-rule);
  overflow: hidden;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(159, 196, 192, .07) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(159, 196, 192, .07) 1px, transparent 1px);
  background-size: 92px 92px;
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, .9), rgba(0, 0, 0, 0) 76%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, .9), rgba(0, 0, 0, 0) 76%);
  pointer-events: none;
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(1.5rem, 4vw, 3rem);
  align-items: start;
}

.page-about .about-hero__frame {
  position: relative;
  border: 1px solid var(--about-rule);
  border-top: 2px solid var(--orange);
  padding: clamp(1.15rem, 3vw, 2.4rem);
  background: rgba(11, 20, 24, .42);
}

.page-about .about-hero__kicker {
  margin: 1rem 0 0;
  font-size: .72rem;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-about .about-hero__title {
  margin: .7rem 0 1rem;
  font-size: clamp(2.1rem, 6.4vw, 4.1rem);
  line-height: .98;
  letter-spacing: -.02em;
  font-weight: 900;
  font-stretch: 87.5%;
  color: var(--white);
}

.page-about .about-hero__lead {
  margin: 0;
  max-width: 38em;
  font-size: clamp(.96rem, 1.6vw, 1.05rem);
  line-height: 1.82;
  color: var(--mist);
}

.page-about .about-hero__acts {
  display: flex;
  flex-wrap: wrap;
  gap: .7rem;
  margin-top: 1.6rem;
}

.page-about .about-readout {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--about-rule);
  border: 1px solid var(--about-rule);
}

.page-about .about-readout__item {
  display: flex;
  flex-direction: column;
  gap: .3rem;
  padding: 1rem 1.05rem 1.15rem;
  background: rgba(11, 20, 24, .92);
}

.page-about .about-readout__k {
  font-size: .68rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--mono-gray);
}

.page-about .about-readout__v {
  font-size: clamp(1.25rem, 2.5vw, 1.7rem);
  font-weight: 800;
  line-height: 1.1;
  color: var(--paper);
  letter-spacing: -.01em;
}

.page-about .about-readout__n {
  font-size: .76rem;
  line-height: 1.6;
  color: var(--mono-gray);
}

/* ---------- 主体骨架 ---------- */
.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
}

/* ---------- 左侧刻度尺 ---------- */
.page-about .about-scale {
  background: #070F12;
  border-bottom: 1px solid var(--about-rule);
}

.page-about .about-scale__inner {
  padding: 1rem 1rem 1.15rem;
}

.page-about .about-scale__head {
  display: flex;
  justify-content: space-between;
  gap: .75rem;
  margin: 0 0 .7rem;
  padding-bottom: .6rem;
  border-bottom: 1px solid var(--about-rule);
  font-size: .66rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--mono-gray);
}

.page-about .about-scale__list {
  display: flex;
  gap: .35rem;
  margin: 0;
  padding: 0 0 .25rem;
  list-style: none;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}

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

.page-about .about-scale__link {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: .5rem;
  padding: .55rem .8rem .6rem;
  white-space: nowrap;
  text-decoration: none;
  color: var(--mono-gray);
  font-size: .84rem;
  border-top: 2px solid transparent;
  transition: color .2s var(--ease), border-color .2s var(--ease), background-color .2s var(--ease);
}

.page-about .about-scale__link:hover,
.page-about .about-scale__link:focus-visible {
  color: var(--white);
  border-top-color: var(--orange);
  background: rgba(159, 196, 192, .06);
}

.page-about .about-scale__num {
  font-size: .72rem;
  color: var(--orange);
  letter-spacing: .06em;
}

/* ---------- 内容区块底色 ---------- */
.page-about .about-stream {
  min-width: 0;
}

.page-about .about-sec {
  position: relative;
  padding: clamp(2.25rem, 5.4vw, 4.5rem) clamp(1.1rem, 4vw, 3.5rem);
  border-bottom: 1px solid var(--about-rule);
  scroll-margin-top: calc(var(--head-h) + 3.5rem);
}

.page-about .about-sec--ink {
  background: var(--ink);
  color: var(--white);
}

.page-about .about-sec--green {
  background: var(--ink-green);
  color: var(--white);
}

.page-about .about-sec--paper {
  background: var(--paper);
  color: var(--ink);
  border-bottom-color: var(--about-rule-dark);
}

.page-about .about-sec:target {
  box-shadow: inset 3px 0 0 var(--orange);
}

/* ---------- 章节头 ---------- */
.page-about .about-head {
  max-width: 62ch;
  margin: 0 0 clamp(1.4rem, 3vw, 2.4rem);
}

.page-about .about-head__idx {
  display: inline-block;
  margin-bottom: .85rem;
  padding: .16rem .55rem;
  font-size: .7rem;
  letter-spacing: .18em;
  color: var(--orange);
  border: 1px solid currentColor;
}

.page-about .about-sec--paper .about-head__idx {
  color: var(--orange-deep);
}

.page-about .about-head__title {
  margin: 0 0 .7rem;
  font-size: clamp(1.45rem, 3.6vw, 2.45rem);
  line-height: 1.14;
  letter-spacing: -.016em;
  font-weight: 900;
  font-stretch: 87.5%;
}

.page-about .about-head__lead {
  margin: 0;
  font-size: clamp(.95rem, 1.5vw, 1.02rem);
  line-height: 1.78;
  color: var(--mist);
}

.page-about .about-sec--paper .about-head__lead {
  color: var(--about-ink-soft);
}

/* ---------- 通用正文 ---------- */
.page-about .about-copy p {
  margin: 0 0 1rem;
  max-width: 38em;
  font-size: .96rem;
  line-height: 1.82;
  color: rgba(255, 255, 255, .86);
}

.page-about .about-sec--paper .about-copy p {
  color: #2C383D;
}

.page-about .about-points {
  display: grid;
  gap: 0;
  margin: 1.3rem 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--about-rule);
}

.page-about .about-points li {
  position: relative;
  padding: .72rem 0 .72rem 1.4rem;
  border-bottom: 1px solid var(--about-rule);
  font-size: .9rem;
  line-height: 1.68;
  color: var(--mist);
}

.page-about .about-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 1.2rem;
  width: 9px;
  height: 1px;
  background: var(--orange);
}

.page-about .about-sec--paper .about-points {
  border-top-color: var(--about-rule-dark);
}

.page-about .about-sec--paper .about-points li {
  border-bottom-color: var(--about-rule-dark);
  color: var(--about-ink-soft);
}

/* ---------- R-01 坐标主张 ---------- */
.page-about .about-coord {
  display: grid;
  gap: clamp(1.4rem, 3.6vw, 2.6rem);
  align-items: start;
}

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

/* ---------- R-02 三条主线 ---------- */
.page-about .about-lines {
  display: grid;
  gap: 1.15rem;
}

.page-about .about-line {
  position: relative;
  padding: 1.3rem 1.25rem 1.45rem;
  background: var(--ink-green);
  color: var(--white);
  border: 1px solid var(--line);
  border-top: 2px solid var(--orange);
  box-shadow: 0 1px 0 rgba(11, 20, 24, .08);
}

.page-about .about-line__no {
  display: inline-block;
  margin-bottom: .6rem;
  font-size: .7rem;
  letter-spacing: .16em;
  color: var(--orange);
}

.page-about .about-line__title {
  margin: 0 0 .6rem;
  font-size: clamp(1.02rem, 2.2vw, 1.2rem);
  line-height: 1.35;
  font-weight: 800;
  color: var(--white);
}

.page-about .about-line__text {
  margin: 0;
  font-size: .9rem;
  line-height: 1.78;
  color: var(--mist);
}

.page-about .about-line__list {
  display: grid;
  gap: .5rem;
  margin: .9rem 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-line__list li {
  position: relative;
  padding-left: 1.05rem;
  font-size: .85rem;
  line-height: 1.66;
  color: rgba(255, 255, 255, .78);
}

.page-about .about-line__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .72rem;
  width: 6px;
  height: 6px;
  background: var(--lime);
}

.page-about .about-line__link {
  display: inline-block;
  margin-top: 1rem;
  padding-bottom: 2px;
  font-size: .85rem;
  color: var(--lime);
  text-decoration: none;
  border-bottom: 1px solid currentColor;
  transition: color .2s var(--ease);
}

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

/* ---------- R-03 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: clamp(1.4rem, 3.6vw, 2.6rem);
  align-items: start;
}

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

.page-about .about-team__roles {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--about-rule);
}

.page-about .about-role {
  padding: 1.1rem 0 1.2rem 1.35rem;
  border-bottom: 1px solid var(--about-rule);
  position: relative;
}

.page-about .about-role::before {
  content: "";
  position: absolute;
  left: 0;
  top: 1.45rem;
  width: 10px;
  height: 1px;
  background: var(--orange);
}

.page-about .about-role__title {
  margin: 0 0 .5rem;
  font-size: 1.02rem;
  line-height: 1.4;
  font-weight: 800;
  color: var(--white);
}

.page-about .about-role__text {
  margin: 0;
  max-width: 42em;
  font-size: .9rem;
  line-height: 1.78;
  color: var(--mist);
}

/* ---------- R-04 本地支持 ---------- */
.page-about .about-region {
  display: grid;
  gap: clamp(1.4rem, 3.6vw, 2.6rem);
  align-items: start;
}

.page-about .about-region__acts {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .9rem;
  margin: 1.5rem 0 0;
}

.page-about .about-region__text-link {
  font-size: .88rem;
  color: var(--teal);
  text-decoration: none;
  border-bottom: 1px solid currentColor;
  padding-bottom: 2px;
}

.page-about .about-region__text-link:hover,
.page-about .about-region__text-link:focus-visible {
  color: var(--orange-deep);
}

.page-about .about-contact {
  display: grid;
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--about-rule-dark);
  border: 1px solid var(--about-rule-dark);
}

.page-about .about-contact__item {
  display: flex;
  flex-direction: column;
  gap: .32rem;
  padding: 1rem 1.1rem 1.15rem;
  background: #FBF7EF;
}

.page-about .about-contact__label {
  font-size: .68rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--teal);
}

.page-about .about-contact__value {
  font-size: clamp(.95rem, 1.8vw, 1.05rem);
  font-weight: 700;
  line-height: 1.5;
  color: var(--ink);
  word-break: break-word;
}

.page-about .about-contact__note {
  font-size: .8rem;
  line-height: 1.66;
  color: var(--about-ink-soft);
}

/* ---------- R-05 版本演进 ---------- */
.page-about .about-sec--versions {
  background:
    linear-gradient(180deg, rgba(11, 20, 24, .94) 0%, rgba(18, 51, 47, .92) 100%),
    var(--ink);
}

.page-about .about-versions__figure {
  margin: 0 0 clamp(1.6rem, 3.4vw, 2.6rem);
}

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

.page-about .about-gen__item {
  display: grid;
  grid-template-columns: 2.6rem minmax(0, 1fr);
  gap: 1rem;
  padding: 1.15rem 0 1.25rem;
  border-bottom: 1px solid var(--about-rule);
}

.page-about .about-gen__marker {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.4rem;
  height: 2.4rem;
  font-size: .76rem;
  letter-spacing: .04em;
  color: var(--orange);
  border: 1px solid var(--line-strong);
  background: rgba(11, 20, 24, .6);
}

.page-about .about-gen__title {
  margin: 0 0 .45rem;
  font-size: 1rem;
  line-height: 1.42;
  font-weight: 800;
  color: var(--white);
}

.page-about .about-gen__body p {
  margin: 0;
  max-width: 46em;
  font-size: .9rem;
  line-height: 1.78;
  color: var(--mist);
}

/* ---------- R-06 合作生态 ---------- */
.page-about .about-eco__rail {
  margin: 0;
}

.page-about .about-eco__track {
  display: flex;
  gap: .85rem;
  margin: 0;
  padding: 0 0 .6rem;
  list-style: none;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scroll-snap-type: x proximity;
  scrollbar-width: thin;
}

.page-about .about-eco__track:focus-visible {
  outline: 2px solid var(--teal);
  outline-offset: 4px;
}

.page-about .about-eco__item {
  flex: 0 0 min(78vw, 320px);
  scroll-snap-align: start;
  padding: 1.2rem 1.2rem 1.35rem;
  background: #FBF7EF;
  border: 1px solid var(--about-rule-dark);
  border-top: 2px solid var(--teal);
  transition: border-top-color .2s var(--ease), transform .2s var(--ease);
}

.page-about .about-eco__item:hover {
  border-top-color: var(--orange);
  transform: translateY(-2px);
}

.page-about .about-eco__k {
  display: inline-block;
  margin-bottom: .6rem;
  font-size: .7rem;
  letter-spacing: .14em;
  color: var(--teal);
}

.page-about .about-eco__title {
  margin: 0 0 .55rem;
  font-size: 1rem;
  line-height: 1.42;
  font-weight: 800;
  color: var(--ink);
}

.page-about .about-eco__item p {
  margin: 0;
  font-size: .87rem;
  line-height: 1.76;
  color: var(--about-ink-soft);
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  padding: clamp(2.25rem, 5.4vw, 4rem) clamp(1.1rem, 4vw, 3.5rem);
  background:
    linear-gradient(120deg, rgba(36, 96, 92, .55) 0%, rgba(11, 20, 24, .96) 64%),
    var(--ink);
  border-top: 2px solid var(--orange);
}

.page-about .about-cta__title {
  margin: 0 0 .7rem;
  font-size: clamp(1.35rem, 3.2vw, 2rem);
  line-height: 1.16;
  font-weight: 900;
  font-stretch: 87.5%;
  letter-spacing: -.016em;
  color: var(--white);
}

.page-about .about-cta__text {
  margin: 0;
  max-width: 44em;
  font-size: .95rem;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-cta__acts {
  display: flex;
  flex-wrap: wrap;
  gap: .7rem;
  margin-top: 1.4rem;
}

/* ---------- 图片自适应 ---------- */
.page-about .media-frame__img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 平板及以上 ---------- */
@media (min-width: 760px) {
  .page-about .about-coord {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.02fr);
  }

  .page-about .about-coord__media {
    margin-top: 2.5rem;
  }

  .page-about .about-team {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.15fr);
  }

  .page-about .about-region {
    grid-template-columns: minmax(0, 1fr) minmax(0, .92fr);
  }

  .page-about .about-eco__item {
    flex: 0 0 min(46vw, 340px);
  }
}

/* ---------- 桌面：左右分屏 + 错位卡片 ---------- */
@media (min-width: 1000px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, .88fr);
    align-items: stretch;
  }

  .page-about .about-readout {
    align-content: start;
  }

  .page-about .about-body {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
  }

  .page-about .about-scale {
    border-bottom: 0;
    border-right: 1px solid var(--about-rule);
  }

  .page-about .about-scale__inner {
    position: sticky;
    top: calc(var(--head-h) + 4.5rem);
    max-height: calc(100vh - var(--head-h) - 5.5rem);
    overflow-y: auto;
    padding: 3.25rem 1.35rem 3rem 1.5rem;
  }

  .page-about .about-scale__head {
    flex-direction: column;
    gap: .3rem;
  }

  .page-about .about-scale__list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-scale__link {
    display: grid;
    grid-template-columns: auto minmax(0, 1fr);
    gap: .8rem;
    align-items: baseline;
    padding: .9rem 0 .9rem 1.4rem;
    white-space: normal;
    border-top: 0;
    border-left: 1px solid var(--about-rule);
    font-size: .9rem;
  }

  .page-about .about-scale__link::before {
    content: "";
    position: absolute;
    left: -4px;
    top: 50%;
    width: 7px;
    height: 7px;
    margin-top: -4px;
    background: #070F12;
    border: 1px solid var(--line-strong);
    transform: rotate(45deg);
    transition: background-color .2s var(--ease), border-color .2s var(--ease);
  }

  .page-about .about-scale__link:hover,
  .page-about .about-scale__link:focus-visible {
    background: transparent;
    border-top-color: transparent;
    border-left-color: var(--orange);
    color: var(--white);
  }

  .page-about .about-scale__link:hover::before,
  .page-about .about-scale__link:focus-visible::before {
    background: var(--orange);
    border-color: var(--orange);
  }

  .page-about .about-lines {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    gap: 1.6rem 1.5rem;
    align-items: start;
  }

  .page-about .about-lines > .about-line:nth-child(1) {
    grid-column: 1 / span 7;
  }

  .page-about .about-lines > .about-line:nth-child(2) {
    grid-column: 8 / span 5;
    margin-top: 3rem;
  }

  .page-about .about-lines > .about-line:nth-child(3) {
    grid-column: 3 / span 7;
    margin-top: .25rem;
  }

  .page-about .about-gen__item {
    grid-template-columns: 3.2rem minmax(0, 1fr);
    gap: 1.4rem;
  }

  .page-about .about-eco__track {
    padding-bottom: .8rem;
  }

  .page-about .about-eco__item {
    flex: 0 0 300px;
  }
}

/* ---------- 降低动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-scale__link,
  .page-about .about-line__link,
  .page-about .about-eco__item {
    transition: none;
  }

  .page-about .about-eco__item:hover {
    transform: none;
  }
}