.page-about {
  --about-gap: clamp(18px, 3vw, 34px);
  --about-panel: rgba(20, 16, 51, .82);
  --about-card: linear-gradient(158deg, rgba(29, 24, 66, .92), rgba(10, 8, 32, .96));
  color: var(--white);
  padding-bottom: clamp(48px, 8vw, 96px);
}

/* 面包屑 */
.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .55em;
  margin: 0 auto clamp(18px, 3vw, 28px);
  font-family: var(--ff-mono);
  font-size: .8125rem;
  letter-spacing: .06em;
  color: var(--mist);
}

.page-about .breadcrumb__item {
  color: var(--mist);
  text-decoration: none;
}

.page-about .breadcrumb a.breadcrumb__item {
  color: var(--cyan);
}

.page-about .breadcrumb a.breadcrumb__item:hover {
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* 首屏 */
.page-about .about-hero {
  display: grid;
  gap: clamp(30px, 5vw, 54px);
  align-items: start;
}

.page-about .about-kicker {
  display: inline-flex;
  align-items: center;
  position: relative;
  margin: 0 0 .9em;
  padding-left: 1em;
  font-family: var(--ff-mono);
  font-size: .78rem;
  letter-spacing: .14em;
  color: var(--cyan);
}

.page-about .about-kicker::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 4px;
  height: 1.05em;
  background: var(--pink);
  transform: translateY(-50%) skewY(-14deg);
}

.page-about .about-hero__title {
  margin: 0 0 .55em;
  font-family: var(--ff-display);
  font-weight: 900;
  font-size: clamp(1.85rem, 5.2vw, 3.4rem);
  line-height: 1.14;
  letter-spacing: -.012em;
  color: var(--white);
}

.page-about .about-hero__lead {
  margin: 0 0 1.4em;
  max-width: 34em;
  font-size: clamp(.95rem, 1.5vw, 1.0625rem);
  line-height: 1.85;
  color: rgba(246, 244, 255, .8);
}

.page-about .about-hero__chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 1.4em;
  padding: 0;
  list-style: none;
}

.page-about .about-hero__chips li {
  padding: .42em .85em;
  border: 1px solid var(--line);
  border-left: 2px solid var(--cyan);
  font-family: var(--ff-mono);
  font-size: .78rem;
  letter-spacing: .04em;
  color: rgba(246, 244, 255, .86);
  background: rgba(20, 16, 51, .55);
}

.page-about .about-hero__note {
  margin: 0;
  font-size: .8125rem;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-hero__note a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(47, 232, 213, .45);
}

.page-about .about-hero__note a:hover {
  border-bottom-color: var(--cyan);
}

/* 首屏右侧错位档案卡 */
.page-about .about-hero__stack {
  position: relative;
  display: grid;
  gap: 0;
}

.page-about .about-plate {
  border: 2px solid var(--line-strong);
  background: var(--ink-2);
}

.page-about .about-plate--photo {
  position: relative;
  z-index: 1;
  margin: 0;
  padding: 8px;
  transform: rotate(-1.4deg);
  box-shadow: 10px 12px 0 rgba(255, 63, 158, .14);
}

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

.page-about .about-plate--photo figcaption {
  padding: .7em .2em .2em;
  font-family: var(--ff-mono);
  font-size: .72rem;
  letter-spacing: .1em;
  color: var(--mist);
}

.page-about .about-plate--stats {
  position: relative;
  z-index: 2;
  margin: -20px 0 0 clamp(12px, 5vw, 40px);
  padding: clamp(16px, 3vw, 22px);
  transform: rotate(.9deg);
  background: var(--paper);
  border-color: var(--paper-edge);
  box-shadow: -8px 10px 0 rgba(10, 8, 32, .55);
  color: var(--paper-ink);
}

.page-about .about-figures {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  margin: 0;
}

.page-about .about-figures dt {
  font-family: var(--ff-mono);
  font-size: .7rem;
  letter-spacing: .08em;
  color: #6c6489;
}

.page-about .about-figures dd {
  margin: .3em 0 0;
  font-family: var(--ff-mono);
  font-weight: 700;
  font-size: clamp(1.05rem, 2.6vw, 1.5rem);
  line-height: 1.1;
  color: var(--paper-ink);
}

.page-about .about-figures dd span {
  margin-left: .18em;
  font-size: .62em;
  font-weight: 400;
  color: #6c6489;
}

/* 章节通用 */
.page-about .about-section {
  margin-top: clamp(52px, 9vw, 104px);
}

.page-about .section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: .7em;
  margin: 0 0 clamp(14px, 2.4vw, 22px);
  padding-bottom: clamp(10px, 1.8vw, 16px);
  border-bottom: 1px solid var(--line);
}

.page-about .section-head__no {
  font-family: var(--ff-mono);
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: .02em;
  color: var(--cyan);
}

.page-about .section-head__title {
  flex: 1 1 15em;
  margin: 0;
  font-family: var(--ff-display);
  font-weight: 900;
  font-size: clamp(1.3rem, 3.2vw, 1.95rem);
  line-height: 1.3;
  letter-spacing: -.005em;
  color: var(--white);
}

.page-about .about-section__lead {
  max-width: 40em;
  margin: 0 0 clamp(22px, 3.6vw, 34px);
  font-size: .95rem;
  line-height: 1.85;
  color: rgba(246, 244, 255, .76);
}

.page-about h3 {
  font-family: var(--ff-display);
  font-weight: 700;
  color: var(--white);
}

/* 01 业务线 */
.page-about .about-lines {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(14px, 2.2vw, 20px);
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-line {
  position: relative;
  padding: clamp(18px, 2.8vw, 26px);
  border: 1px solid var(--line);
  background: var(--about-card);
  overflow: hidden;
}

.page-about .about-line::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: linear-gradient(180deg, var(--cyan), rgba(47, 232, 213, 0));
  transform: scaleY(.45);
  transform-origin: top;
  transition: transform .3s ease;
}

.page-about .about-line:hover::before,
.page-about .about-line:focus-within::before {
  transform: scaleY(1);
}

.page-about .about-line__no {
  display: block;
  font-family: var(--ff-mono);
  font-size: .8rem;
  letter-spacing: .16em;
  color: var(--pink);
}

.page-about .about-line__title {
  margin: .5em 0 .45em;
  font-size: 1.15rem;
  letter-spacing: .01em;
}

.page-about .about-line__desc {
  margin: 0;
  font-size: .9rem;
  line-height: 1.85;
  color: rgba(246, 244, 255, .74);
}

/* 02 时间线 */
.page-about .about-timeline__banner {
  margin: 0 0 clamp(24px, 4vw, 38px);
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
  overflow: hidden;
}

.page-about .about-timeline__banner img {
  display: block;
  width: 100%;
  height: clamp(120px, 22vw, 220px);
  object-fit: cover;
  opacity: .9;
}

.page-about .about-timeline {
  position: relative;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 14px;
  bottom: 14px;
  width: 1px;
  background: linear-gradient(180deg, rgba(47, 232, 213, .6), rgba(154, 150, 196, .18) 70%, rgba(154, 150, 196, 0));
}

.page-about .about-milestone {
  position: relative;
  padding: 0 0 clamp(24px, 4vw, 38px) clamp(30px, 6vw, 46px);
}

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

.page-about .about-milestone__dot {
  position: absolute;
  left: 0;
  top: .35em;
  width: 17px;
  height: 17px;
  border-radius: 50%;
  border: 1.5px solid var(--cyan);
  background: var(--ink);
  box-shadow: 0 0 0 3px rgba(47, 232, 213, .1), 0 0 14px rgba(47, 232, 213, .42);
  transition: box-shadow .25s ease, background .25s ease;
}

.page-about .about-milestone:hover .about-milestone__dot {
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(47, 232, 213, .18), 0 0 20px rgba(47, 232, 213, .7);
}

.page-about .about-milestone__year {
  display: block;
  margin-bottom: .35em;
  font-family: var(--ff-mono);
  font-size: clamp(1.05rem, 2.6vw, 1.4rem);
  font-weight: 700;
  letter-spacing: .04em;
  line-height: 1.1;
  color: var(--cyan);
}

.page-about .about-milestone__body {
  padding: clamp(15px, 2.4vw, 22px);
  border: 1.5px solid var(--line);
  background: var(--about-panel);
  transition: border-color .24s ease, transform .24s ease;
}

.page-about .about-milestone:hover .about-milestone__body,
.page-about .about-milestone:focus-within .about-milestone__body {
  border-color: rgba(47, 232, 213, .72);
  transform: translateX(5px);
}

.page-about .about-milestone__title {
  margin: 0 0 .45em;
  font-size: 1.05rem;
  line-height: 1.4;
}

.page-about .about-milestone__body p {
  margin: 0;
  font-size: .9rem;
  line-height: 1.85;
  color: rgba(246, 244, 255, .74);
}

/* 03 团队 */
.page-about .about-team {
  display: grid;
  gap: clamp(22px, 3.6vw, 34px);
}

.page-about .about-team__visual {
  margin: 0;
  border: 1px solid var(--line);
  background: var(--ink-2);
  padding: 8px;
}

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

.page-about .about-team__visual figcaption {
  padding: .75em .3em .25em;
  font-family: var(--ff-mono);
  font-size: .74rem;
  letter-spacing: .1em;
  color: var(--amber);
}

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

.page-about .about-role {
  padding: clamp(14px, 2.2vw, 18px) 0;
  border-bottom: 1px solid var(--line);
  transition: background .22s ease, padding-left .22s ease;
}

.page-about .about-role:hover,
.page-about .about-role:focus-within {
  padding-left: 10px;
  background: linear-gradient(90deg, rgba(47, 232, 213, .08), rgba(47, 232, 213, 0));
}

.page-about .about-role__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: .4em;
}

.page-about .about-role__name {
  margin: 0;
  font-size: 1.05rem;
}

.page-about .about-role__count {
  font-family: var(--ff-mono);
  font-size: .82rem;
  letter-spacing: .06em;
  color: var(--pink);
  white-space: nowrap;
}

.page-about .about-role__desc {
  margin: 0;
  font-size: .88rem;
  line-height: 1.8;
  color: rgba(246, 244, 255, .72);
}

/* 04 流程 */
.page-about .about-process.paper-card {
  color: var(--paper-ink);
  padding: clamp(20px, 3.4vw, 34px);
}

.page-about .about-steps {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(18px, 2.6vw, 26px);
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-step__no {
  display: inline-block;
  padding: .2em .5em;
  border: 1px solid rgba(25, 21, 51, .35);
  font-family: var(--ff-mono);
  font-size: .74rem;
  letter-spacing: .12em;
  color: var(--paper-ink);
  background: rgba(217, 199, 161, .5);
}

.page-about .about-step__title {
  margin: .7em 0 .4em;
  font-family: var(--ff-display);
  font-size: 1.05rem;
  color: var(--paper-ink);
}

.page-about .about-step p {
  margin: 0;
  font-size: .875rem;
  line-height: 1.85;
  color: #3b3459;
}

.page-about .about-process__foot {
  margin: clamp(20px, 3vw, 28px) 0 0;
  padding-top: clamp(14px, 2vw, 18px);
  border-top: 1px dashed rgba(25, 21, 51, .28);
  font-size: .85rem;
  line-height: 1.8;
  color: #4a4270;
}

/* 05 合作 */
.page-about .about-coop {
  display: grid;
  gap: clamp(20px, 3.4vw, 32px);
}

.page-about .about-coop__stat {
  padding: clamp(20px, 3vw, 28px);
  border: 1.5px solid rgba(47, 232, 213, .34);
  background: radial-gradient(120% 120% at 0% 0%, rgba(47, 232, 213, .12), rgba(10, 8, 32, .9) 62%);
}

.page-about .about-coop__num {
  display: block;
  font-family: var(--ff-mono);
  font-weight: 700;
  font-size: clamp(2.2rem, 8vw, 3.4rem);
  line-height: 1;
  letter-spacing: -.01em;
  color: var(--cyan);
}

.page-about .about-coop__num span {
  margin-left: .2em;
  font-size: .34em;
  letter-spacing: .08em;
  color: var(--mist);
}

.page-about .about-coop__stat p {
  margin: .9em 0 0;
  font-size: .9rem;
  line-height: 1.8;
  color: rgba(246, 244, 255, .76);
}

.page-about .about-coop__list {
  display: grid;
  gap: clamp(14px, 2vw, 18px);
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-coop__list li {
  padding-left: 16px;
  border-left: 2px solid var(--pink);
}

.page-about .about-coop__list h3 {
  margin: 0 0 .35em;
  font-size: 1rem;
}

.page-about .about-coop__list p {
  margin: 0;
  font-size: .875rem;
  line-height: 1.8;
  color: rgba(246, 244, 255, .72);
}

.page-about .about-coop__cta {
  margin: clamp(20px, 3vw, 28px) 0 0;
  font-size: .875rem;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-coop__cta a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(47, 232, 213, .45);
}

.page-about .about-coop__cta a:hover {
  border-bottom-color: var(--cyan);
}

/* 06 节奏 */
.page-about .about-cadence {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(14px, 2.2vw, 20px);
}

.page-about .about-cadence__item {
  padding: clamp(18px, 2.8vw, 24px);
  border: 1px solid var(--line);
  border-top: 3px solid transparent;
  background: var(--about-card);
}

.page-about .about-cadence__item:nth-child(1) {
  border-top-color: var(--cyan);
}

.page-about .about-cadence__item:nth-child(2) {
  border-top-color: var(--pink);
}

.page-about .about-cadence__item:nth-child(3) {
  border-top-color: var(--amber);
}

.page-about .about-cadence__tag {
  margin-bottom: .8em;
}

.page-about .about-cadence__item h3 {
  margin: 0 0 .5em;
  font-size: 1.05rem;
  line-height: 1.45;
}

.page-about .about-cadence__item p {
  margin: 0;
  font-size: .875rem;
  line-height: 1.85;
  color: rgba(246, 244, 255, .74);
}

.page-about .about-cadence__item a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(47, 232, 213, .45);
}

.page-about .about-cadence__item a:hover {
  border-bottom-color: var(--cyan);
}

/* 结尾 */
.page-about .about-cta {
  margin-top: clamp(52px, 9vw, 100px);
}

.page-about .about-cta__box {
  position: relative;
  padding: clamp(26px, 4.6vw, 46px);
  border: 1.5px solid var(--line-strong);
  background: linear-gradient(112deg, rgba(255, 63, 158, .16), rgba(20, 16, 51, .92) 46%, rgba(47, 232, 213, .14));
  overflow: hidden;
}

.page-about .about-cta__box::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 42%;
  height: 6px;
  background: linear-gradient(90deg, var(--cyan), var(--pink), var(--amber));
  transform: skewX(-26deg);
  transform-origin: right top;
}

.page-about .about-cta__title {
  margin: 0 0 .7em;
  font-family: var(--ff-display);
  font-weight: 900;
  font-size: clamp(1.3rem, 3.4vw, 1.9rem);
  line-height: 1.3;
  color: var(--white);
}

.page-about .about-cta__text {
  max-width: 38em;
  margin: 0 0 1.6em;
  font-size: .925rem;
  line-height: 1.85;
  color: rgba(246, 244, 255, .78);
}

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

/* 响应式 */
@media (min-width: 640px) {
  .page-about .about-steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (min-width: 880px) {
  .page-about .about-hero {
    grid-template-columns: 1.02fr .98fr;
    gap: clamp(34px, 4vw, 56px);
  }

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

  .page-about .about-timeline::before {
    left: 8px;
    top: 26px;
  }

  .page-about .about-milestone {
    display: grid;
    grid-template-columns: minmax(110px, 150px) minmax(0, 1fr);
    gap: clamp(20px, 3vw, 40px);
    padding-left: clamp(36px, 4vw, 56px);
  }

  .page-about .about-milestone__dot {
    top: .55em;
  }

  .page-about .about-milestone__year {
    margin-top: .1em;
    text-align: left;
  }

  .page-about .about-team {
    grid-template-columns: .86fr 1.14fr;
    align-items: start;
  }

  .page-about .about-steps {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: clamp(18px, 2.2vw, 26px);
  }

  .page-about .about-step {
    padding-right: 14px;
    border-right: 1px solid rgba(25, 21, 51, .16);
  }

  .page-about .about-step:last-child {
    padding-right: 0;
    border-right: 0;
  }

  .page-about .about-coop {
    grid-template-columns: .78fr 1.22fr;
    align-items: start;
  }

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

@media (min-width: 1100px) {
  .page-about .about-hero__stack {
    padding-top: 6px;
  }

  .page-about .about-plate--stats {
    margin-top: -30px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-line::before,
  .page-about .about-milestone__dot,
  .page-about .about-milestone__body,
  .page-about .about-role {
    transition: none;
  }

  .page-about .about-milestone:hover .about-milestone__body,
  .page-about .about-milestone:focus-within .about-milestone__body {
    transform: none;
  }

  .page-about .about-role:hover,
  .page-about .about-role:focus-within {
    padding-left: 0;
  }
}