.page-about {
  --prose: #BBD3CD;
  --prose-strong: #E8F5F0;
  background-color: var(--ink-950);
  background-image:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 48px 48px;
  color: var(--paper-100);
  font-family: var(--font-body);
}

/* ============ 首屏 ============ */
.page-about .about-hero {
  position: relative;
  padding: clamp(18px, 4vw, 34px) 0 clamp(30px, 5vw, 58px);
  border-bottom: 1px solid var(--line);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -70px;
  right: -90px;
  width: min(60vw, 640px);
  height: min(60vw, 640px);
  background: radial-gradient(circle at center, rgba(44, 242, 200, .14), transparent 62%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 96px;
  height: 3px;
  background: var(--orange-500);
}

.page-about .about-hero__grid {
  position: relative;
  display: grid;
  gap: 26px;
  margin-top: 26px;
}

.page-about .about-hero h1 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(34px, 7.2vw, 72px);
  line-height: 1.04;
  letter-spacing: -0.02em;
  margin: 12px 0 0;
  color: var(--paper-100);
}

.page-about .about-hero__standfirst {
  margin: 20px 0 0;
  max-width: 44ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--prose);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 26px;
}

.page-about .about-hero__facts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--ink-800);
  border: 1px solid var(--line-soft);
}

.page-about .about-hero__facts > li {
  background: var(--ink-900);
  padding: 16px 18px;
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: baseline;
  column-gap: 10px;
  row-gap: 6px;
}

.page-about .about-hero__num {
  font-family: var(--font-num);
  font-size: clamp(32px, 6vw, 46px);
  line-height: .92;
  letter-spacing: -0.03em;
  color: var(--cyan-400);
}

.page-about .about-hero__unit {
  font-size: 13px;
  letter-spacing: .12em;
  color: var(--amber-300);
}

.page-about .about-hero__cap {
  grid-column: 1 / -1;
  font-size: 13px;
  line-height: 1.6;
  color: var(--mist-400);
}

/* ============ 主区骨架 ============ */
.page-about .about-body {
  display: grid;
  gap: 34px;
  padding-top: clamp(30px, 6vw, 62px);
  padding-bottom: clamp(40px, 8vw, 88px);
}

.page-about .about-stream {
  min-width: 0;
}

/* ============ 章节 ============ */
.page-about .about-ch {
  position: relative;
  border-top: 1px solid var(--line-soft);
  padding: clamp(26px, 5vw, 44px) 0 clamp(30px, 6vw, 54px);
}

.page-about .about-ch:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .about-ch__tag {
  display: none;
}

.page-about .about-ch__head {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  margin-bottom: 18px;
}

.page-about .about-ch__num {
  flex: none;
  font-family: var(--font-num);
  font-weight: 700;
  font-size: clamp(38px, 7vw, 72px);
  line-height: .84;
  letter-spacing: -0.05em;
  color: var(--cyan-400);
}

.page-about .about-ch__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(23px, 3.6vw, 38px);
  line-height: 1.14;
  letter-spacing: -0.01em;
  margin: 0;
  padding-top: 4px;
  color: var(--paper-100);
}

.page-about .about-ch__body {
  max-width: 66ch;
  font-size: 16px;
  line-height: 1.82;
  color: var(--prose);
}

.page-about .about-ch__body p {
  margin: 0 0 15px;
}

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

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

/* ============ 图片容器 ============ */
.page-about .about-figure {
  margin: 22px 0 0;
  border: 1px solid var(--line-soft);
  background: var(--ink-900);
  overflow: hidden;
}

.page-about .about-figure--cut {
  clip-path: polygon(0 0, calc(100% - 34px) 0, 100% 34px, 100% 100%, 0 100%);
}

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

/* ============ 三阶段时间线 ============ */
.page-about .about-timeline {
  list-style: none;
  margin: 28px 0 0;
  padding: 0 0 0 22px;
  border-left: 1px solid var(--line);
}

.page-about .about-timeline > li {
  position: relative;
  padding: 0 0 26px;
}

.page-about .about-timeline > li:last-child {
  padding-bottom: 0;
}

.page-about .about-timeline > li::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 7px;
  width: 7px;
  height: 7px;
  background: var(--orange-500);
}

.page-about .about-phase {
  margin: 0;
  font-family: var(--font-num);
  font-size: 13px;
  letter-spacing: .16em;
  color: var(--cyan-400);
}

.page-about .about-timeline h3 {
  font-family: var(--font-display);
  font-size: 20px;
  line-height: 1.3;
  margin: 5px 0 7px;
  color: var(--paper-100);
}

.page-about .about-timeline p:not(.about-phase) {
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--prose);
}

/* ============ 横向数据带 ============ */
.page-about .about-band {
  position: relative;
  margin: 6px 0 30px;
  padding: clamp(18px, 3.2vw, 28px);
  border: 1px solid var(--line);
  background: var(--ink-900);
  overflow: hidden;
}

.page-about .about-band::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(104deg, transparent 46%, rgba(44, 242, 200, .07) 46%, rgba(44, 242, 200, .07) 60%, transparent 60%);
  pointer-events: none;
}

.page-about .about-band__cap {
  position: relative;
  margin: 0;
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--cyan-400);
  text-transform: uppercase;
}

.page-about .about-band__list {
  position: relative;
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-band__item {
  display: grid;
  gap: 7px;
}

.page-about .about-band__name {
  font-size: 14px;
  line-height: 1.5;
  color: var(--paper-100);
}

.page-about .about-band__track {
  display: block;
  height: 3px;
  background: var(--ink-800);
}

.page-about .about-band__fill {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, var(--cyan-700), var(--cyan-400));
}

.page-about .about-band__fill--a { width: 92%; }
.page-about .about-band__fill--b { width: 64%; }
.page-about .about-band__fill--c { width: 44%; }
.page-about .about-band__fill--d { width: 76%; }

.page-about .about-band__val {
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--amber-300);
}

/* ============ 栏目列表 ============ */
.page-about .about-columns {
  margin: 24px 0 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-columns__row {
  display: grid;
  gap: 7px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-columns dt {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-size: 19px;
  line-height: 1.3;
  color: var(--paper-100);
}

.page-about .about-columns dt::before {
  content: "";
  flex: none;
  width: 10px;
  height: 2px;
  background: var(--orange-500);
}

.page-about .about-columns dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--prose);
}

/* ============ 团队 ============ */
.page-about .about-team {
  display: grid;
  gap: 24px;
}

.page-about .about-team__text > p {
  margin: 0;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.82;
  color: var(--prose);
}

.page-about .about-roles {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--ink-800);
  border: 1px solid var(--line-soft);
}

.page-about .about-roles > li {
  background: var(--ink-900);
  padding: 16px 18px 18px;
  transition: background-color var(--t-fast) var(--ease);
}

.page-about .about-roles > li:hover {
  background: var(--ink-800);
}

.page-about .about-roles h3 {
  font-family: var(--font-display);
  font-size: 17px;
  margin: 0 0 7px;
  color: var(--cyan-400);
  letter-spacing: .02em;
}

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

.page-about .about-team__figure {
  margin-top: 0;
}

/* ============ 合作与资质 ============ */
.page-about .about-partners {
  display: grid;
  gap: 24px;
}

.page-about .about-badges {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .about-badges > li {
  padding: 8px 12px;
  border: 1px solid var(--line);
  font-size: 13px;
  line-height: 1.4;
  letter-spacing: .05em;
  color: var(--cyan-400);
}

.page-about .about-partners__figure {
  margin-top: 0;
}

/* ============ 使用场景 ============ */
.page-about .about-audience {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--ink-800);
  border: 1px solid var(--line-soft);
}

.page-about .about-audience > li {
  background: var(--ink-900);
  padding: 18px 18px 20px;
  transition: background-color var(--t-fast) var(--ease);
}

.page-about .about-audience > li:hover {
  background: var(--ink-800);
}

.page-about .about-audience h3 {
  font-family: var(--font-display);
  font-size: 18px;
  line-height: 1.3;
  margin: 0 0 8px;
  color: var(--paper-100);
}

.page-about .about-audience p {
  margin: 0;
  font-size: 14px;
  line-height: 1.76;
  color: var(--prose);
}

/* ============ 结尾引导 ============ */
.page-about .about-next {
  margin-top: 6px;
  padding-top: 28px;
  border-top: 1px solid var(--line);
}

.page-about .about-next__lead {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(19px, 2.6vw, 26px);
  line-height: 1.35;
  color: var(--paper-100);
}

.page-about .about-next__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

/* ============ 右侧速览栏 ============ */
.page-about .about-side {
  min-width: 0;
}

.page-about .about-side__cap {
  margin: 0 0 12px;
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--cyan-400);
}

.page-about .about-side__nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .about-side__nav a {
  display: block;
  padding: 9px 12px;
  border-left: 1px solid var(--line-soft);
  font-size: 13px;
  line-height: 1.55;
  color: var(--mist-400);
  text-decoration: none;
  transition: color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease), background-color var(--t-fast) var(--ease);
}

.page-about .about-side__nav a:hover,
.page-about .about-side__nav a[aria-current="true"] {
  color: var(--paper-100);
  border-left-color: var(--cyan-400);
  background: var(--ink-900);
}

.page-about .about-side__card {
  margin-top: 14px;
  padding: 14px 16px 16px;
  border: 1px solid var(--line-soft);
  background: var(--ink-900);
}

.page-about .about-side__card--alt {
  border-left: 2px solid var(--orange-500);
}

.page-about .about-side__card-cap {
  margin: 0;
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--mist-400);
}

.page-about .about-side__card-num {
  margin: 6px 0 0;
  font-family: var(--font-num);
  font-size: clamp(34px, 4.6vw, 48px);
  line-height: .95;
  letter-spacing: -0.04em;
  color: var(--cyan-400);
}

.page-about .about-side__card--plain .about-side__card-num {
  color: var(--paper-100);
}

.page-about .about-side__card-txt {
  margin: 8px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist-400);
}

/* ============ 响应式 ============ */
@media (min-width: 640px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-hero__facts > li {
    grid-template-columns: 1fr;
    align-content: start;
    row-gap: 8px;
  }

  .page-about .about-band__item {
    grid-template-columns: 1fr;
  }

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

@media (min-width: 760px) {
  .page-about .about-columns__row {
    grid-template-columns: 170px minmax(0, 1fr);
    gap: 24px;
    align-items: baseline;
  }

  .page-about .about-band__item {
    grid-template-columns: 210px minmax(0, 1fr) auto;
    align-items: center;
    gap: 16px;
  }

  .page-about .about-band__val {
    text-align: right;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 42px;
    align-items: end;
  }

  .page-about .about-hero__facts > li {
    grid-template-columns: auto 1fr;
  }

  .page-about .about-team {
    grid-template-columns: minmax(0, 1fr) minmax(0, 300px);
    gap: 30px;
    align-items: start;
  }

  .page-about .about-partners {
    grid-template-columns: minmax(0, 1fr) minmax(0, 340px);
    gap: 30px;
    align-items: start;
  }
}

@media (min-width: 1024px) {
  .page-about .about-body {
    grid-template-columns: minmax(0, 1fr) 288px;
    gap: 48px;
    align-items: start;
  }

  .page-about .about-side__inner {
    position: sticky;
    top: 96px;
  }

  .page-about .about-audience {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 1200px) {
  .page-about .about-ch {
    padding-left: 46px;
  }

  .page-about .about-ch:first-child {
    padding-left: 46px;
  }

  .page-about .about-ch__tag {
    display: block;
    position: absolute;
    left: 4px;
    top: clamp(26px, 5vw, 44px);
    writing-mode: vertical-rl;
    transform: rotate(180deg);
    font-size: 11px;
    letter-spacing: .26em;
    color: var(--cyan-700);
    white-space: nowrap;
  }

  .page-about .about-ch:first-child .about-ch__tag {
    top: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition-duration: .001ms !important;
    animation-duration: .001ms !important;
  }
}