.page-about {
  --about-body: #C7D4E1;
  --about-mist-text: #33506B;
  background: var(--navy);
  color: var(--cool);
  font-family: var(--font-body);
  overflow-x: hidden;
}

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

.page-about h1,
.page-about h2,
.page-about h3 {
  font-family: var(--font-head);
  margin: 0;
}

.page-about .about-body {
  color: var(--about-body);
  font-size: 16px;
  line-height: 1.75;
  margin: 16px 0 0;
  max-width: 62ch;
}

/* 首屏 */
.page-about .about-hero {
  position: relative;
  padding-top: clamp(24px, 4vw, 48px);
  padding-bottom: clamp(40px, 6vw, 88px);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 52px 52px;
  -webkit-mask-image: linear-gradient(155deg, rgba(0, 0, 0, .95), transparent 72%);
  mask-image: linear-gradient(155deg, rgba(0, 0, 0, .95), transparent 72%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  top: 0;
  left: -10%;
  width: 130%;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--pitch), var(--amber), transparent);
  transform: rotate(-12deg);
  transform-origin: left center;
  opacity: .6;
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  display: grid;
  gap: clamp(28px, 5vw, 56px);
  align-items: end;
}

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

.page-about .about-hero h1 {
  margin: 14px 0 0;
  font-size: clamp(34px, 7.4vw, 72px);
  font-weight: 800;
  line-height: 1.02;
  letter-spacing: -0.02em;
  color: var(--cool);
}

.page-about .about-hero .lede {
  margin: 18px 0 0;
  max-width: 46ch;
  color: var(--about-body);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .about-hero__board {
  display: grid;
  gap: 2px;
  background: var(--line-soft);
  min-width: 0;
}

.page-about .board-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  padding: 14px 18px;
  background: var(--board);
  border-left: 3px solid var(--pitch);
}

.page-about .board-row__num {
  font-family: var(--font-mono);
  font-size: clamp(24px, 6vw, 34px);
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--cool);
  line-height: 1;
  white-space: nowrap;
}

.page-about .board-row__num em {
  font-style: normal;
  font-size: .46em;
  color: var(--amber);
  margin-left: 6px;
  letter-spacing: .04em;
}

.page-about .board-row__label {
  font-size: 13px;
  color: var(--steel);
  text-align: right;
  line-height: 1.4;
}

/* 章节头 */
.page-about .section-head {
  max-width: 72ch;
}

.page-about .section-head .section-title {
  margin-top: 12px;
  font-size: clamp(24px, 4.4vw, 40px);
  font-weight: 700;
  line-height: 1.12;
  letter-spacing: -0.01em;
}

.page-about .section-head .lede {
  margin-top: 16px;
  color: var(--about-body);
  font-size: clamp(17px, 2.2vw, 21px);
}

/* 四段交付 */
.page-about .about-what {
  background: linear-gradient(180deg, rgba(15, 42, 68, .55), rgba(8, 24, 43, 0) 70%);
}

.page-about .flow {
  list-style: none;
  margin: clamp(28px, 4vw, 44px) 0 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .flow__step {
  background: var(--board);
  border-left: 2px solid var(--pitch);
  padding: 22px 20px 24px;
  min-width: 0;
  transition: background .24s var(--ease);
}

.page-about .flow__step:nth-child(even) {
  border-left-color: var(--pitch-deep);
}

.page-about .flow__step:hover {
  background: #14375a;
}

.page-about .flow__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--flare);
}

.page-about .flow__step h3 {
  margin: 12px 0 8px;
  font-size: clamp(19px, 2.6vw, 23px);
  font-weight: 700;
  color: var(--cool);
}

.page-about .flow__step p {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--about-body);
}

/* 三条主线 */
.page-about .about-lines {
  background: var(--navy);
}

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

.page-about .about-lines .section-title {
  margin: 12px 0 4px;
  font-size: clamp(24px, 4.4vw, 40px);
  font-weight: 700;
  line-height: 1.12;
}

.page-about .lines-list {
  margin-top: 18px;
}

.page-about .line-item {
  padding: 20px 0;
  border-top: 1px solid var(--line);
}

.page-about .line-item h3 {
  font-size: clamp(18px, 2.6vw, 22px);
  font-weight: 700;
  color: var(--cool);
}

.page-about .line-item p {
  margin: 10px 0 14px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--about-body);
  max-width: 60ch;
}

.page-about .line-item .chip {
  margin-right: 8px;
  margin-bottom: 6px;
}

.page-about .about-lines__media {
  margin: 26px 0 0;
  border-left: 2px solid var(--pitch-deep);
}

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

.page-about .media__caption {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--steel);
  margin-top: 10px;
}

/* 团队 */
.page-about .about-team {
  background: linear-gradient(180deg, rgba(12, 107, 69, .16), rgba(8, 24, 43, 0) 65%);
}

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

.page-about .about-team .section-title {
  margin-top: 12px;
  font-size: clamp(24px, 4.4vw, 40px);
  font-weight: 700;
  line-height: 1.12;
}

.page-about .team-bars {
  margin-top: clamp(24px, 3.4vw, 36px);
}

.page-about .team-bar {
  margin-bottom: 24px;
}

.page-about .team-bar__head {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .05em;
  color: var(--steel);
  margin-bottom: 8px;
}

.page-about .team-bar__track {
  height: 10px;
  background: rgba(140, 155, 170, .16);
  overflow: hidden;
}

.page-about .team-bar__fill {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, var(--pitch-deep), var(--pitch));
  transition: filter .24s var(--ease);
}

.page-about .team-bar:hover .team-bar__fill {
  filter: brightness(1.25);
}

.page-about .team-bar__note {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--about-body);
  max-width: 58ch;
}

.page-about .about-team__note {
  margin-top: clamp(28px, 4vw, 40px);
  padding: 22px 22px 8px;
  background: var(--navy-deep);
  border-top: 2px solid var(--amber);
  min-width: 0;
}

.page-about .about-team__note h3 {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 14px;
  color: var(--cool);
}

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

.page-about .about-team__note li {
  padding: 12px 0;
  border-bottom: 1px solid var(--line-soft);
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--about-body);
}

.page-about .about-team__note li:last-child {
  border-bottom: none;
}

.page-about .about-team__note .stamp {
  display: block;
  margin-bottom: 4px;
}

/* 时间轴 */
.page-about .about-history {
  background: var(--navy);
}

.page-about .timeline {
  list-style: none;
  margin: clamp(30px, 4.6vw, 52px) 0 0;
  padding: 0 0 0 26px;
  position: relative;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, rgba(22, 164, 106, .2), var(--pitch) 22%, var(--pitch) 74%, var(--amber));
}

.page-about .timeline__item {
  position: relative;
  display: grid;
  gap: 6px;
  padding-bottom: clamp(26px, 3.6vw, 40px);
}

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 7px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--pitch);
  box-shadow: 0 0 0 4px rgba(22, 164, 106, .16);
}

.page-about .timeline__item--current::before {
  background: var(--amber);
  box-shadow: 0 0 0 4px rgba(255, 176, 32, .18);
}

.page-about .timeline__year {
  font-family: var(--font-mono);
  font-size: clamp(20px, 3vw, 26px);
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--amber);
  line-height: 1;
}

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

.page-about .timeline__body h3 {
  font-size: clamp(18px, 2.6vw, 22px);
  font-weight: 700;
  color: var(--cool);
}

.page-about .timeline__body p {
  margin: 8px 0 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--about-body);
  max-width: 62ch;
}

.page-about .about-history__media {
  margin: clamp(28px, 4vw, 48px) 0 0;
  border-left: 2px solid var(--flare);
}

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

/* 规模 */
.page-about .about-scale {
  background: linear-gradient(180deg, rgba(15, 42, 68, .6), rgba(8, 24, 43, 0) 72%);
}

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

.page-about .about-scale__media {
  margin: 0;
  border-left: 2px solid var(--pitch);
}

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

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

.page-about .about-scale .section-title {
  margin-top: 12px;
  font-size: clamp(24px, 4.4vw, 40px);
  font-weight: 700;
  line-height: 1.12;
}

.page-about .stat-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px 18px;
  margin-top: clamp(24px, 3.4vw, 36px);
}

.page-about .stat {
  border-top: 2px solid var(--line);
  padding-top: 12px;
  min-width: 0;
}

.page-about .stat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(26px, 6vw, 44px);
  font-weight: 700;
  letter-spacing: -.01em;
  line-height: 1.05;
  color: var(--cool);
}

.page-about .stat__num em {
  font-style: normal;
  font-size: .44em;
  color: var(--flare);
  margin-left: 4px;
  letter-spacing: .04em;
}

.page-about .stat__label {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  line-height: 1.5;
  color: var(--steel);
}

/* 合作生态 */
.page-about .about-partners__panel {
  padding: clamp(24px, 4.4vw, 52px);
  color: var(--ink);
  border-left: 4px solid var(--pitch);
  clip-path: polygon(0 0, calc(100% - var(--cut)) 0, 100% var(--cut), 100% 100%, var(--cut) 100%, 0 calc(100% - var(--cut)));
}

.page-about .about-partners__panel .eyebrow {
  color: var(--pitch-deep);
}

.page-about .about-partners__panel .section-title {
  margin: 10px 0 0;
  font-size: clamp(23px, 4.2vw, 38px);
  font-weight: 700;
  line-height: 1.14;
  color: var(--ink);
}

.page-about .about-partners__grid {
  margin-top: clamp(22px, 3vw, 34px);
  gap: clamp(20px, 3vw, 36px);
}

.page-about .about-partners__panel h3 {
  font-size: 18px;
  font-weight: 700;
  color: var(--ink);
  padding-left: 12px;
  border-left: 3px solid var(--pitch);
}

.page-about .about-partners__panel p {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--about-mist-text);
  max-width: 52ch;
}

.page-about .about-partners__foot {
  margin-top: clamp(20px, 3vw, 30px) !important;
  padding-top: 18px;
  border-top: 1px solid rgba(11, 26, 43, .14);
}

.page-about .about-partners__panel .btn {
  margin-top: 20px;
}

/* 方法论 */
.page-about .about-method {
  background: var(--navy);
}

.page-about .method-list {
  list-style: none;
  margin: clamp(28px, 4vw, 44px) 0 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .method-list li {
  background: rgba(15, 42, 68, .72);
  padding: 22px 20px 24px;
  border-top: 2px solid var(--pitch-deep);
  min-width: 0;
}

.page-about .method__idx {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .16em;
  color: var(--navy);
  background: var(--amber);
  padding: 3px 9px;
}

.page-about .method-list h3 {
  margin: 14px 0 8px;
  font-size: clamp(18px, 2.5vw, 21px);
  font-weight: 700;
  color: var(--cool);
}

.page-about .method-list p {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--about-body);
  max-width: 56ch;
}

/* 底部入口 */
.page-about .about-cta {
  background: linear-gradient(180deg, rgba(8, 24, 43, 0), rgba(5, 14, 25, .92));
  padding-bottom: clamp(56px, 8vw, 104px);
}

.page-about .about-cta .section-title {
  font-size: clamp(23px, 4.2vw, 38px);
  font-weight: 700;
  line-height: 1.14;
  max-width: 26ch;
}

.page-about .about-cta__list {
  list-style: none;
  margin: clamp(24px, 3.6vw, 40px) 0 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .about-cta__list a {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 20px 22px;
  background: var(--board);
  border-left: 3px solid var(--pitch);
  color: var(--cool);
  text-decoration: none;
  transition: background .24s var(--ease), border-left-color .24s var(--ease);
}

.page-about .about-cta__list a:hover,
.page-about .about-cta__list a:focus-visible {
  background: #14375a;
  border-left-color: var(--flare);
}

.page-about .about-cta__list strong {
  font-family: var(--font-head);
  font-size: 18px;
  font-weight: 700;
}

.page-about .about-cta__list span {
  font-size: 14px;
  line-height: 1.6;
  color: var(--steel);
}

/* 断点 */
@media (min-width: 720px) {
  .page-about .flow {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .page-about .timeline__item {
    grid-template-columns: 108px minmax(0, 1fr);
    gap: 26px;
    align-items: start;
  }

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

  .page-about .about-cta__list a {
    flex-direction: column;
    height: 100%;
  }
}

@media (min-width: 960px) {
  .page-about .about-hero__inner {
    grid-template-columns: 7fr 5fr;
    gap: clamp(36px, 5vw, 72px);
  }

  .page-about .split {
    display: grid;
    grid-template-columns: 7fr 5fr;
    gap: clamp(36px, 4.6vw, 64px);
    align-items: start;
  }

  .page-about .about-team .split {
    grid-template-columns: 7fr 5fr;
  }

  .page-about .about-scale__inner {
    grid-template-columns: 5fr 7fr;
  }

  .page-about .flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .timeline__item {
    grid-template-columns: 132px minmax(0, 1fr);
  }

  .page-about .about-partners__grid {
    gap: 40px;
  }
}

@media (min-width: 1200px) {
  .page-about .about-hero__board {
    margin-bottom: 6px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .flow__step,
  .page-about .team-bar__fill,
  .page-about .about-cta__list a {
    transition: none;
  }
}