.page-about {
  --about-pad: clamp(52px, 7vw, 104px);
  --about-gap: clamp(18px, 2.6vw, 32px);
  background: var(--ink);
  color: var(--body-dark);
  font-family: var(--font-body);
  line-height: 1.75;
  overflow-x: clip;
}

.page-about p {
  margin: 0 0 1em;
}

.page-about h1,
.page-about h2,
.page-about h3 {
  font-family: var(--font-display);
  letter-spacing: -0.02em;
  line-height: 1.16;
  margin: 0 0 0.5em;
  color: #FFFFFF;
}

.page-about .about-eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--cyan);
  margin: 0 0 14px;
}

.page-about .about-idx {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--orange);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: clamp(18px, 2.6vw, 30px) 0 var(--about-pad);
  border-bottom: 1px solid var(--line);
  background-image:
    linear-gradient(to right, rgba(30, 53, 85, 0.45) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(30, 53, 85, 0.45) 1px, transparent 1px);
  background-size: 84px 84px;
  background-position: -1px -1px;
}

.page-about .about-hero .breadcrumb {
  margin-bottom: clamp(22px, 3.2vw, 40px);
}

.page-about .about-hero__inner {
  display: grid;
  gap: clamp(28px, 4vw, 52px);
  align-items: end;
}

.page-about .about-hero h1 {
  font-size: clamp(2.05rem, 6.2vw, 3.6rem);
  max-width: 11em;
  margin-bottom: 0.45em;
}

.page-about .about-hero__lead {
  font-size: clamp(15px, 1.6vw, 17px);
  color: #C9D6E6;
  max-width: 46em;
  margin-bottom: 1.6em;
}

.page-about .about-hero__facts {
  list-style: none;
  margin: 0 0 1.8em;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 16px 28px;
}

.page-about .about-hero__facts li {
  border-left: 1px solid var(--line);
  padding-left: 14px;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.page-about .about-hero__num {
  font-family: var(--font-display);
  font-size: 1.7rem;
  line-height: 1;
  color: var(--cyan);
  letter-spacing: -0.02em;
}

.page-about .about-hero__fact {
  font-size: 13px;
  color: var(--mist);
  line-height: 1.5;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-hero__viz {
  max-width: 300px;
  margin-left: auto;
}

.page-about .about-hero__svg {
  display: block;
  width: 100%;
  height: auto;
}

/* ---------- 起点 ---------- */
.page-about .about-why {
  background: var(--paper);
  color: var(--paper-ink);
  padding-block: var(--about-pad);
}

.page-about .about-why__inner {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
}

.page-about .about-why .about-eyebrow {
  color: var(--cyan-dim);
}

.page-about .about-why h2 {
  color: var(--paper-ink);
  font-size: clamp(1.55rem, 3.6vw, 2.5rem);
  max-width: 18em;
}

.page-about .about-why__main p {
  font-size: clamp(15px, 1.6vw, 16.5px);
  max-width: 52em;
  color: #253140;
}

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

.page-about .about-why__side {
  background: var(--ink);
  color: var(--body-dark);
  padding: 24px 20px;
  border-radius: var(--radius);
  box-shadow: var(--shadow-lift);
}

.page-about .about-why__side h3 {
  font-size: 15px;
  color: #FFFFFF;
  margin-bottom: 16px;
  letter-spacing: 0;
}

.page-about .about-why__side ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-why__side li {
  display: grid;
  grid-template-columns: 22px minmax(0, 1fr);
  gap: 10px;
  font-size: 14px;
  line-height: 1.6;
  color: #B7C5D8;
  border-top: 1px solid var(--line-soft);
  padding-top: 12px;
}

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

.page-about .about-why__side strong {
  color: #FFFFFF;
  font-weight: 600;
}

/* ---------- 区块头 ---------- */
.page-about .about-head {
  max-width: 56em;
  margin-bottom: clamp(24px, 3.4vw, 40px);
}

.page-about .about-head h2 {
  font-size: clamp(1.6rem, 3.6vw, 2.5rem);
}

.page-about .about-head__lead {
  color: var(--mist);
  font-size: 15.5px;
  margin-bottom: 0;
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  padding-block: var(--about-pad);
  border-top: 1px solid var(--line);
}

.page-about .about-timeline__figure {
  margin: 0 0 clamp(22px, 3.2vw, 34px);
}

.page-about .about-timeline__figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--ink-2);
}

.page-about .about-timeline__figure figcaption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--index-blue);
}

.page-about .about-jump {
  list-style: none;
  margin: 0 0 clamp(22px, 3.2vw, 34px);
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .about-jump a {
  display: inline-flex;
  align-items: center;
  min-height: 36px;
  padding: 6px 13px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--mist);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  text-decoration: none;
  transition: color 0.16s var(--ease), background 0.16s var(--ease), border-color 0.16s var(--ease);
}

.page-about .about-jump a:hover,
.page-about .about-jump a:focus-visible {
  color: var(--ink);
  background: var(--cyan);
  border-color: var(--cyan);
  outline: none;
}

.page-about .about-stages {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-stage {
  position: relative;
  display: grid;
  gap: 4px;
  padding: 0 0 clamp(26px, 3.6vw, 38px) 24px;
  border-left: 1px solid var(--line);
}

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

.page-about .about-stage::before {
  content: "";
  position: absolute;
  left: -4.5px;
  top: 8px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--ink);
  border: 1px solid var(--cyan-dim);
  box-shadow: 0 0 0 4px rgba(30, 231, 214, 0.08);
  transition: background 0.16s var(--ease), border-color 0.16s var(--ease);
}

.page-about .about-stage:hover::before {
  background: var(--cyan);
  border-color: var(--cyan);
}

.page-about .about-stage__year {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--cyan);
  margin: 0 0 4px;
}

.page-about .about-stage h3 {
  font-size: clamp(1.05rem, 2vw, 1.3rem);
  margin-bottom: 8px;
}

.page-about .about-stage__body p {
  color: #B7C5D8;
  font-size: 15px;
  max-width: 56em;
  margin-bottom: 10px;
}

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

.page-about .about-stage__body a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(30, 231, 214, 0.4);
}

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

.page-about .about-stage .about-stage__impact {
  display: flex;
  align-items: baseline;
  gap: 10px;
  font-size: 13px;
  color: var(--orange);
  margin-bottom: 0;
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  padding-block: var(--about-pad);
  border-top: 1px solid var(--line);
  background: var(--ink-2);
}

.page-about .about-roles {
  list-style: none;
  margin: 0 0 clamp(28px, 4vw, 50px);
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-role {
  position: relative;
  padding: 22px 20px 20px;
  background: var(--ink-3);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: transform 0.18s var(--ease), border-color 0.18s var(--ease), box-shadow 0.18s var(--ease);
}

.page-about .about-role::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 34px;
  height: 2px;
  background: var(--magenta);
}

.page-about .about-role:hover,
.page-about .about-role:focus-within,
.page-about .about-role:focus {
  transform: translateY(-4px);
  border-color: var(--cyan-dim);
  box-shadow: var(--shadow-lift);
  outline: none;
}

.page-about .about-role__count {
  font-family: var(--font-display);
  font-size: 2.4rem;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--cyan);
  margin: 0 0 10px;
}

.page-about .about-role__count span {
  font-family: var(--font-body);
  font-size: 13px;
  letter-spacing: 0;
  color: var(--mist);
  margin-left: 8px;
}

.page-about .about-role h3 {
  font-size: 1.05rem;
  margin-bottom: 8px;
}

.page-about .about-role__desc {
  font-size: 14.5px;
  color: #B7C5D8;
  margin: 0;
}

.page-about .about-role__more {
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--mist);
  margin: 0;
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  transition: max-height 0.22s var(--ease), opacity 0.22s var(--ease), margin-top 0.22s var(--ease);
}

.page-about .about-role:hover .about-role__more,
.page-about .about-role:focus .about-role__more,
.page-about .about-role:focus-within .about-role__more {
  max-height: 160px;
  opacity: 1;
  margin-top: 12px;
}

.page-about .about-flow {
  display: grid;
  gap: clamp(24px, 3.6vw, 42px);
}

.page-about .about-flow__text h3 {
  font-size: clamp(1.05rem, 2vw, 1.3rem);
  margin-bottom: 18px;
}

.page-about .about-flow__steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 13px;
}

.page-about .about-flow__steps li {
  display: grid;
  grid-template-columns: 30px minmax(0, 1fr);
  gap: 12px;
  font-size: 14.5px;
  color: #B7C5D8;
  border-top: 1px solid var(--line-soft);
  padding-top: 13px;
}

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

.page-about .about-flow__steps strong {
  display: block;
  color: #FFFFFF;
  font-size: 15px;
  margin-bottom: 2px;
  font-weight: 600;
}

.page-about .about-flow__steps .about-idx {
  padding-top: 3px;
}

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

.page-about .about-flow__figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--ink-3);
}

/* ---------- 节奏 ---------- */
.page-about .about-cadence {
  padding-block: var(--about-pad);
  border-top: 1px solid var(--line);
}

.page-about .about-cadence__grid {
  display: grid;
  gap: 14px;
}

.page-about .about-beat {
  padding: 22px 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--ink-3);
  display: grid;
  gap: 6px;
  align-content: start;
}

.page-about .about-beat__num {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4.4vw, 2.9rem);
  line-height: 1;
  letter-spacing: -0.02em;
  margin: 0;
}

.page-about .about-beat--month .about-beat__num {
  color: var(--cyan);
}

.page-about .about-beat--quarter .about-beat__num {
  color: var(--orange);
}

.page-about .about-beat--year .about-beat__num {
  color: var(--magenta);
}

.page-about .about-beat h3 {
  font-size: 1rem;
  margin: 0;
}

.page-about .about-beat p {
  font-size: 14px;
  line-height: 1.65;
  color: var(--mist);
  margin: 0;
}

.page-about .about-cadence__note {
  margin: clamp(20px, 3vw, 30px) 0 0;
  font-size: 15px;
  color: #B7C5D8;
  border-left: 2px solid var(--cyan);
  padding-left: 16px;
  max-width: 56em;
}

.page-about .about-strong {
  font-family: var(--font-mono);
  font-size: 1.08em;
  color: var(--orange);
}

/* ---------- 服务范围 ---------- */
.page-about .about-reach {
  padding-block: var(--about-pad);
  border-top: 1px solid var(--line);
  background: var(--ink-2);
}

.page-about .about-reach__inner {
  display: grid;
  gap: clamp(26px, 4vw, 48px);
  align-items: center;
}

.page-about .about-reach h2 {
  font-size: clamp(1.55rem, 3.6vw, 2.4rem);
  max-width: 16em;
}

.page-about .about-reach__copy > p {
  color: #B7C5D8;
  font-size: 15px;
  max-width: 40em;
}

.page-about .about-range {
  margin-top: 22px;
}

.page-about .about-range__input {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
}

.page-about .about-range__switch {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 18px;
}

.page-about .about-range__switch label {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding: 8px 15px;
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--mist);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: color 0.16s var(--ease), background 0.16s var(--ease), border-color 0.16s var(--ease);
}

.page-about .about-range__switch label:hover {
  color: var(--body-dark);
  border-color: var(--cyan-dim);
}

.page-about #range-coverage:checked ~ .about-range__switch label[for="range-coverage"],
.page-about #range-peak:checked ~ .about-range__switch label[for="range-peak"] {
  background: var(--magenta);
  border-color: var(--magenta);
  color: #FFFFFF;
}

.page-about #range-coverage:focus-visible ~ .about-range__switch label[for="range-coverage"],
.page-about #range-peak:focus-visible ~ .about-range__switch label[for="range-peak"] {
  outline: var(--focus-ring);
  outline-offset: 2px;
}

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

.page-about #range-coverage:checked ~ .about-range__view--coverage,
.page-about #range-peak:checked ~ .about-range__view--peak {
  display: block;
}

.page-about .about-range__view dl {
  display: grid;
  gap: 12px;
  margin: 0;
}

.page-about .about-range__view dl > div {
  display: grid;
  grid-template-columns: 62px minmax(0, 1fr);
  gap: 12px;
  border-top: 1px solid var(--line-soft);
  padding-top: 12px;
}

.page-about .about-range__view dl > div:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .about-range__view dt {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--cyan);
  padding-top: 3px;
}

.page-about .about-range__view dd {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.65;
  color: #B7C5D8;
}

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

.page-about .about-reach__figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--ink-3);
}

/* ---------- 结尾 ---------- */
.page-about .about-cta {
  padding-block: clamp(60px, 8vw, 118px);
  border-top: 1px solid var(--line);
}

.page-about .about-cta__inner {
  max-width: 46em;
  display: grid;
  gap: 10px;
}

.page-about .about-cta h2 {
  font-size: clamp(1.6rem, 4vw, 2.6rem);
  margin-bottom: 0.2em;
}

.page-about .about-cta p {
  color: var(--mist);
  font-size: 15.5px;
  margin-bottom: 0.6em;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 8px;
}

/* ---------- 平板与桌面 ---------- */
@media (min-width: 640px) {
  .page-about .about-reach__figure {
    max-width: 560px;
    margin-inline: auto;
  }
}

@media (min-width: 760px) {
  .page-about .about-roles {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

@media (min-width: 800px) {
  .page-about .about-stage {
    grid-template-columns: 118px minmax(0, 1fr);
    gap: 0 30px;
    padding-left: 32px;
  }

  .page-about .about-stage__year {
    text-align: right;
    padding-top: 4px;
    margin-bottom: 0;
  }
}

@media (min-width: 880px) {
  .page-about .about-flow {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.92fr);
    align-items: start;
  }
}

@media (min-width: 900px) {
  .page-about .about-why__inner {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 0.8fr);
    align-items: start;
  }

  .page-about .about-reach__inner {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  }

  .page-about .about-reach__figure {
    max-width: none;
  }
}

@media (min-width: 940px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: clamp(32px, 5vw, 68px);
  }

  .page-about .about-hero__viz {
    max-width: 360px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-role,
  .page-about .about-role__more,
  .page-about .about-stage::before,
  .page-about .about-jump a,
  .page-about .about-range__switch label {
    transition: none;
  }

  .page-about .about-role:hover,
  .page-about .about-role:focus {
    transform: none;
  }
}