.page-about {
  --about-rail-w: 208px;
  --about-muted: rgba(233, 243, 240, 0.8);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: clamp(26px, 4vw, 42px) 0 clamp(38px, 6vw, 76px);
  border-bottom: 1px solid var(--grid);
  background:
    radial-gradient(120% 92% at 88% 4%, rgba(53, 242, 208, 0.14), transparent 58%),
    linear-gradient(180deg, var(--pitch) 0%, var(--ink) 100%);
}

.page-about .about-hero__gridlines {
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(30, 74, 62, 0.6) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(30, 74, 62, 0.38) 1px, transparent 1px);
  background-size: 96px 96px;
  -webkit-mask-image: linear-gradient(180deg, #000 0%, transparent 88%);
  mask-image: linear-gradient(180deg, #000 0%, transparent 88%);
}

.page-about .about-hero .breadcrumb {
  margin: 0 0 clamp(22px, 3.5vw, 42px);
  font-size: 13.5px;
  color: var(--dim);
}

.page-about .about-hero .breadcrumb a {
  color: var(--dim);
  text-decoration: none;
  transition: color 0.16s var(--ease);
}

.page-about .about-hero .breadcrumb a:hover,
.page-about .about-hero .breadcrumb a:focus-visible {
  color: var(--cyan);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 52px);
  align-items: end;
}

.page-about .about-hero__kicker {
  margin: 0 0 16px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .about-hero__title {
  margin: 0 0 22px;
  font-family: var(--serif);
  font-weight: 700;
  font-size: clamp(38px, 7.2vw, 84px);
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: var(--mist);
}

.page-about .about-hero__accent {
  color: var(--cyan);
}

.page-about .about-hero__lead {
  max-width: 50ch;
  margin: 0 0 22px;
  font-size: clamp(16.5px, 1.6vw, 19px);
  line-height: 1.75;
  color: var(--about-muted);
}

.page-about .about-hero__meta {
  margin: 0;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--dim);
}

.page-about .about-hero__media {
  margin: 0;
  aspect-ratio: 14 / 9;
}

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

/* ---------- 主体两栏 ---------- */

.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(30px, 5vw, 64px);
  padding: clamp(44px, 7vw, 88px) 0 clamp(42px, 6vw, 80px);
}

@media (min-width: 1040px) {
  .page-about .about-body {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: clamp(40px, 5vw, 80px);
  }
}

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

@media (min-width: 1040px) {
  .page-about .about-rail {
    display: block;
    position: sticky;
    top: calc(var(--header-h) + 32px);
    align-self: start;
    padding: 4px 0 4px 20px;
    border-left: 1px solid var(--grid);
  }
}

.page-about .about-rail__title {
  margin: 0 0 14px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--dim);
}

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

.page-about .about-rail__list a {
  display: flex;
  gap: 10px;
  padding: 7px 8px 7px 0;
  font-size: 13.5px;
  line-height: 1.45;
  color: var(--dim);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.16s var(--ease), border-color 0.16s var(--ease);
}

.page-about .about-rail__list a:hover,
.page-about .about-rail__list a:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--grid);
}

.page-about .about-rail__num {
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 600;
  color: var(--dim);
  opacity: 0.75;
}

/* ---------- 章节 ---------- */

.page-about .about-chapter {
  padding-bottom: clamp(38px, 5vw, 64px);
  margin-bottom: clamp(38px, 5vw, 64px);
  border-bottom: 1px solid var(--grid);
}

.page-about .about-chapter:last-child {
  padding-bottom: 0;
  margin-bottom: 0;
  border-bottom: 0;
}

.page-about .about-chapter .section__eyebrow {
  margin: 0 0 14px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.page-about .about-chapter .section__title {
  margin: 0 0 20px;
  font-family: var(--serif);
  font-size: clamp(26px, 3.4vw, 42px);
  line-height: 1.18;
  letter-spacing: -0.01em;
  color: var(--mist);
}

.page-about .about-chapter .section__lead {
  max-width: 62ch;
  margin: 0 0 28px;
  font-size: 16.5px;
  line-height: 1.75;
  color: var(--about-muted);
}

.page-about .about-content .prose {
  max-width: 68ch;
}

.page-about .about-content .prose p {
  color: var(--about-muted);
}

.page-about .about-content .prose a {
  color: var(--cyan-soft);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-content .prose a:hover,
.page-about .about-content .prose a:focus-visible {
  color: var(--cyan);
}

/* ---------- 关键数字 ---------- */

.page-about .about-figures {
  list-style: none;
  margin: 32px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--grid);
  border: 1px solid var(--grid);
}

.page-about .about-figure {
  padding: 22px 20px 24px;
  background: var(--panel);
  border-top: 2px solid transparent;
  transition: border-color 0.18s var(--ease), background-color 0.18s var(--ease);
}

.page-about .about-figure:hover {
  border-top-color: var(--cyan);
  background: #16453A;
}

.page-about .about-figure__num {
  display: block;
  font-family: var(--mono);
  font-size: clamp(32px, 4vw, 46px);
  font-weight: 600;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--orange);
  font-variant-numeric: tabular-nums;
}

.page-about .about-figure__label {
  display: block;
  margin-top: 9px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--amber);
}

.page-about .about-figure__desc {
  margin: 13px 0 0;
  font-size: 15px;
  line-height: 1.68;
  color: var(--about-muted);
}

@media (min-width: 640px) {
  .page-about .about-figures {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 服务对象 ---------- */

.page-about .about-audience {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--grid);
  border: 1px solid var(--grid);
}

.page-about .aud-card {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 26px 22px 30px;
  background: var(--pitch);
}

.page-about .aud-card .tag {
  align-self: flex-start;
}

.page-about .aud-card h3 {
  margin: 0;
  font-family: var(--serif);
  font-size: 21px;
  line-height: 1.34;
  color: var(--mist);
}

.page-about .aud-card p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.72;
  color: var(--about-muted);
}

@media (min-width: 860px) {
  .page-about .about-audience {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 数据工作流 ---------- */

.page-about .about-flow {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 3vw, 38px);
  align-items: start;
}

.page-about .about-flow__media {
  margin: 0;
  aspect-ratio: 3 / 2;
}

.page-about .about-flow__steps {
  list-style: none;
  margin: 0;
  padding: 0;
  counter-reset: flow;
  border-top: 1px solid var(--grid);
}

.page-about .about-flow__steps li {
  position: relative;
  counter-increment: flow;
  padding: 18px 0 20px 46px;
  border-bottom: 1px solid var(--grid);
}

.page-about .about-flow__steps li::before {
  content: counter(flow, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 19px;
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--cyan);
}

.page-about .about-flow__steps h3 {
  margin: 0 0 7px;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--mist);
}

.page-about .about-flow__steps p {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--about-muted);
}

@media (min-width: 900px) {
  .page-about .about-flow {
    grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
  }
}

/* ---------- CN 控球率三指标 ---------- */

.page-about .metric-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin-top: 4px;
  background: var(--grid);
  border: 1px solid var(--grid);
}

.page-about .metric {
  position: relative;
  overflow: hidden;
  padding: 26px 22px 26px;
  background: var(--panel);
}

.page-about .metric::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 3px;
  background: var(--cyan);
  transform: scaleX(0.22);
  transform-origin: left center;
  transition: transform 0.32s var(--ease);
}

.page-about .metric:hover::after {
  transform: scaleX(1);
}

.page-about .metric__idx {
  display: inline-block;
  padding: 3px 8px;
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.14em;
  color: var(--ink);
  background: var(--cyan);
}

.page-about .metric h3 {
  margin: 16px 0 10px;
  font-family: var(--serif);
  font-size: 22px;
  line-height: 1.3;
  color: var(--mist);
}

.page-about .metric p {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.72;
  color: var(--about-muted);
}

.page-about .metric .metric__answer {
  margin: 0;
  padding-top: 12px;
  border-top: 1px dashed var(--grid);
  font-size: 14px;
  line-height: 1.62;
  color: var(--amber);
}

@media (min-width: 860px) {
  .page-about .metric-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .about-note {
  margin: 24px 0 0;
  padding-left: 16px;
  border-left: 2px solid var(--orange);
  font-size: 15.5px;
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- 团队与协作 ---------- */

.page-about .about-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 3vw, 42px);
  align-items: start;
}

.page-about .about-team__media {
  margin: 0;
  aspect-ratio: 10 / 7;
}

.page-about .about-roles {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--grid);
  border: 1px solid var(--grid);
}

.page-about .about-role {
  padding: 20px 18px 22px;
  background: var(--pitch);
}

.page-about .about-role__num {
  display: block;
  font-family: var(--mono);
  font-size: 26px;
  font-weight: 600;
  line-height: 1.1;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .about-role__name {
  display: block;
  margin-top: 9px;
  font-size: 14px;
  letter-spacing: 0.03em;
  color: var(--about-muted);
}

@media (min-width: 700px) {
  .page-about .about-roles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1100px) {
  .page-about .about-roles {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-team {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
  }
}

/* ---------- 历程 ---------- */

.page-about .roadmap {
  list-style: none;
  margin: 30px 0 0;
  padding: 0 0 0 28px;
  border-left: 1px solid var(--grid);
}

.page-about .roadmap__item {
  position: relative;
  padding-bottom: 30px;
}

.page-about .roadmap__item:last-child {
  padding-bottom: 0;
}

.page-about .roadmap__item::before {
  content: "";
  position: absolute;
  left: -33px;
  top: 7px;
  width: 9px;
  height: 9px;
  background: var(--ink);
  border: 1px solid var(--cyan);
  transform: rotate(45deg);
}

.page-about .roadmap__phase {
  margin: 0 0 7px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--amber);
}

.page-about .roadmap__item h3 {
  margin: 0 0 8px;
  font-family: var(--serif);
  font-size: 20px;
  line-height: 1.32;
  color: var(--mist);
}

.page-about .roadmap__item p {
  max-width: 60ch;
  margin: 0;
  font-size: 15.5px;
  line-height: 1.75;
  color: var(--about-muted);
}

/* ---------- 三条自我要求 ---------- */

.page-about .promise-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .promise {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 18px;
  padding: 22px 22px 24px;
  border-left: 3px solid var(--cyan);
  background:
    linear-gradient(90deg, rgba(53, 242, 208, 0.07), transparent 62%),
    var(--panel);
}

.page-about .promise__num {
  padding-top: 4px;
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--cyan);
}

.page-about .promise__body h3 {
  margin: 0 0 8px;
  font-family: var(--serif);
  font-size: 20px;
  line-height: 1.32;
  color: var(--mist);
}

.page-about .promise__body p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.75;
  color: var(--about-muted);
}

.page-about .promise__body a {
  color: var(--cyan-soft);
  text-decoration: underline;
  text-underline-offset: 3px;
}

@media (max-width: 560px) {
  .page-about .promise {
    grid-template-columns: minmax(0, 1fr);
    gap: 10px;
  }

  .page-about .promise__num {
    padding-top: 0;
  }
}

/* ---------- 入口区 ---------- */

.page-about .about-cta {
  padding: clamp(46px, 6vw, 80px) 0;
  border-top: 1px solid var(--grid);
  background: linear-gradient(180deg, var(--ink) 0%, var(--pitch) 100%);
}

.page-about .about-cta__title {
  margin: 0 0 14px;
  font-family: var(--serif);
  font-size: clamp(26px, 3.4vw, 38px);
  line-height: 1.2;
  color: var(--mist);
}

.page-about .about-cta__lead {
  max-width: 56ch;
  margin: 0 0 30px;
  font-size: 16.5px;
  line-height: 1.72;
  color: var(--about-muted);
}

.page-about .about-cta__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--grid);
  border: 1px solid var(--grid);
}

.page-about .about-cta__card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 22px 20px 26px;
  background: var(--panel);
  text-decoration: none;
  transition: background-color 0.18s var(--ease);
}

.page-about .about-cta__card:hover {
  background: #16453A;
}

.page-about .about-cta__card:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: -2px;
  background: #16453A;
}

.page-about .about-cta__label {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .about-cta__name {
  font-family: var(--serif);
  font-size: 19px;
  line-height: 1.3;
  color: var(--mist);
}

.page-about .about-cta__desc {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.66;
  color: var(--about-muted);
}

@media (min-width: 680px) {
  .page-about .about-cta__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1040px) {
  .page-about .about-cta__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 动效降级 ---------- */

@media (prefers-reduced-motion: reduce) {
  .page-about .about-figure,
  .page-about .metric::after,
  .page-about .about-rail__list a,
  .page-about .about-cta__card,
  .page-about .about-hero .breadcrumb a {
    transition-duration: 0.001ms;
  }
}