.page-about {
  background: var(--mineral);
  color: var(--ink);
  font-family: var(--font-body);
  overflow-x: hidden;
}

.page-about .breadcrumbs {
  padding: 22px 0 0;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: 26px 0 46px;
}

.page-about .about-hero__grid {
  row-gap: 34px;
}

.page-about .about-hero__eyebrow {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--stone);
}

.page-about .about-hero__title {
  margin: 0 0 20px;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(28px, 7.2vw, 54px);
  line-height: 1.14;
  letter-spacing: -0.01em;
  max-width: 17ch;
}

.page-about .about-hero__text {
  margin: 0 0 26px;
  font-size: 16px;
  line-height: 1.8;
  max-width: 58ch;
}

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

.page-about .about-hero__aside {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px 18px;
  border-top: 1px solid var(--silver);
  padding-top: 24px;
}

.page-about .hero-stat__num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(24px, 6vw, 36px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--indigo-900);
}

.page-about .hero-stat__label {
  margin: 9px 0 0;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--stone);
}

/* ---------- 章节骨架 ---------- */
.page-about .section {
  padding-top: clamp(42px, 7vw, 88px);
}

.page-about .section__head {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
  border-top: 1px solid var(--silver);
  padding-top: 20px;
  margin-bottom: 34px;
}

.page-about .section__index {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(32px, 8vw, 60px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--silver);
}

.page-about .section__title {
  margin: 0 0 12px;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(23px, 4.6vw, 34px);
  line-height: 1.24;
  letter-spacing: -0.01em;
}

.page-about .section__lead {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--stone);
  max-width: 64ch;
}

/* ---------- 01 时间线 ---------- */
.page-about .about-timeline__figure {
  margin: 0 0 36px;
}

.page-about .media-frame {
  margin: 0;
  position: relative;
}

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

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

.page-about .tl::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: var(--silver);
}

.page-about .tl__node {
  position: relative;
  padding: 0 0 30px 38px;
  max-width: 68ch;
  outline: none;
}

.page-about .tl__node:last-child {
  padding-bottom: 6px;
}

.page-about .tl__dot {
  position: absolute;
  left: 0;
  top: 4px;
  width: 15px;
  height: 15px;
  border: 1px solid var(--stone);
  background: var(--mineral);
  border-radius: 50%;
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .tl__ver {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.14em;
  color: var(--signal);
}

.page-about .tl__title {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 20px;
  line-height: 1.3;
}

.page-about .tl__brief {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.78;
}

.page-about .tl__more {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--stone);
  border-left: 2px solid var(--cyan);
  padding-left: 12px;
}

/* ---------- 02 团队 ---------- */
.page-about .team-grid {
  align-items: start;
  row-gap: 34px;
}

.page-about .role {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
  padding: 24px 0;
  border-top: 1px solid var(--silver);
}

.page-about .role__tag {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--indigo-900);
  border-left: 3px solid var(--cyan);
  padding-left: 10px;
  line-height: 1.5;
}

.page-about .role:nth-child(2) .role__tag {
  border-left-color: var(--signal);
}

.page-about .role:nth-child(3) .role__tag {
  border-left-color: var(--moss);
}

.page-about .role__title {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 18px;
  line-height: 1.35;
}

.page-about .role__text {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.78;
}

.page-about .team-figure {
  margin-top: 4px;
}

.page-about .flow {
  list-style: none;
  margin: 40px 0 0;
  padding: 1px 0 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--silver);
  border: 1px solid var(--silver);
}

.page-about .flow__step {
  background: var(--paper);
  padding: 18px 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.page-about .flow__n {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--signal);
}

.page-about .flow__t {
  font-size: 15px;
  font-weight: 700;
  line-height: 1.4;
}

/* ---------- 03 品类编码 ---------- */
.page-about .codes-grid {
  align-items: start;
  row-gap: 34px;
}

.page-about .cat-code {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.1em;
  padding: 3px 10px;
  border: 1px solid var(--indigo-700);
  color: var(--indigo-900);
  background: var(--paper);
  border-radius: 999px;
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-about .cat-code:hover {
  background: var(--signal);
  border-color: var(--signal);
  color: var(--ink);
}

.page-about .codes-note {
  margin: 22px 0 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--ink);
}

.page-about .codes-link {
  color: var(--indigo-900);
  border-bottom: 1px solid var(--cyan);
  text-decoration: none;
}

.page-about .codes-link:hover {
  color: var(--signal);
}

/* ---------- 04 更新节奏 ---------- */
.page-about .about-cadence {
  background: var(--indigo-900);
  color: var(--mineral);
  margin-top: clamp(44px, 8vw, 100px);
  padding: clamp(44px, 7vw, 92px) 0;
}

.page-about .about-cadence .section__head {
  border-top-color: rgba(246, 241, 231, 0.24);
}

.page-about .about-cadence .section__index {
  color: rgba(47, 214, 198, 0.72);
}

.page-about .about-cadence .section__title {
  color: var(--mineral);
}

.page-about .about-cadence .section__lead {
  color: rgba(246, 241, 231, 0.72);
}

.page-about .cadence-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: rgba(246, 241, 231, 0.2);
  border-top: 1px solid rgba(246, 241, 231, 0.2);
  border-bottom: 1px solid rgba(246, 241, 231, 0.2);
}

.page-about .cadence-cell {
  background: var(--indigo-900);
  padding: 24px 18px;
}

.page-about .cadence-num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(32px, 7vw, 48px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--signal);
}

.page-about .cadence-label {
  margin: 12px 0 0;
  font-size: 13px;
  line-height: 1.65;
  color: rgba(246, 241, 231, 0.74);
}

.page-about .cadence-note {
  margin: 28px 0 0;
  font-size: 15.5px;
  line-height: 1.8;
  color: rgba(246, 241, 231, 0.86);
  max-width: 66ch;
}

.page-about .cadence-link {
  color: var(--cyan);
  border-bottom: 1px solid rgba(47, 214, 198, 0.5);
  text-decoration: none;
}

.page-about .cadence-link:hover {
  color: var(--signal);
}

/* ---------- 05 服务网络 ---------- */
.page-about .network-grid {
  align-items: start;
  row-gap: 32px;
}

.page-about .network-text {
  margin: 0 0 18px;
  font-size: 15.5px;
  line-height: 1.8;
}

.page-about .network-text:last-child {
  margin-bottom: 0;
}

.page-about .network-link {
  color: var(--indigo-900);
  border-bottom: 1px solid var(--cyan);
  text-decoration: none;
  font-weight: 700;
}

.page-about .network-link:hover {
  color: var(--signal);
}

.page-about .partner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
  background: var(--paper);
  border: 1px solid var(--silver);
  border-left: 3px solid var(--indigo-700);
  padding: 22px 20px;
  margin-bottom: 14px;
  transition: transform var(--dur) var(--ease), outline-color var(--dur) var(--ease);
  outline: 1px solid transparent;
  outline-offset: -1px;
}

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

.page-about .partner:hover {
  transform: translateY(-2px);
  outline-color: var(--cyan);
}

.page-about .partner:nth-child(2) {
  border-left-color: var(--signal);
}

.page-about .partner:nth-child(3) {
  border-left-color: var(--moss);
}

.page-about .partner__name {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 18px;
  line-height: 1.35;
}

.page-about .partner__desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
}

.page-about .partner__meta {
  margin: 4px 0 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  color: var(--stone);
}

/* ---------- 06 办公信息 ---------- */
.page-about .about-info {
  padding-bottom: clamp(56px, 8vw, 104px);
}

.page-about .info-bar {
  margin: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--silver);
  border: 1px solid var(--silver);
}

.page-about .info-bar__item {
  margin: 0;
  background: var(--paper);
  padding: 18px 20px;
}

.page-about .info-bar__key {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  color: var(--stone);
}

.page-about .info-bar__val {
  margin: 9px 0 0;
  font-size: 15px;
  line-height: 1.62;
  word-break: break-word;
}

.page-about .info-bar__val--mono {
  font-family: var(--font-mono);
  letter-spacing: 0.02em;
}

.page-about .about-info__note {
  margin: 20px 0 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--stone);
  max-width: 70ch;
}

/* ---------- 焦点与悬停 ---------- */
.page-about a:focus-visible,
.page-about .tl__node:focus-visible,
.page-about .tl__node:focus {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

.page-about .tl__node:hover .tl__dot,
.page-about .tl__node:focus .tl__dot {
  background: var(--signal);
  border-color: var(--signal);
  box-shadow: 0 0 0 4px rgba(255, 122, 47, 0.16);
}

/* ---------- 平板以上 ---------- */
@media (min-width: 700px) {
  .page-about .section__head {
    grid-template-columns: auto 1fr;
    gap: 14px 30px;
    align-items: start;
  }

  .page-about .role {
    grid-template-columns: 140px minmax(0, 1fr);
    gap: 6px 26px;
    align-items: start;
  }

  .page-about .role__tag {
    padding-top: 2px;
  }

  .page-about .flow {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

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

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

  .page-about .partner {
    grid-template-columns: 150px minmax(0, 1fr);
    gap: 6px 24px;
    align-items: baseline;
    padding: 24px 22px;
  }

  .page-about .partner__desc {
    grid-column: 2;
  }

  .page-about .partner__meta {
    grid-column: 2;
  }
}

/* ---------- 桌面端 ---------- */
@media (min-width: 1024px) {
  .page-about .about-hero {
    padding: 34px 0 62px;
  }

  .page-about .about-hero__aside {
    border-top: 0;
    border-left: 1px solid var(--silver);
    padding: 6px 0 6px 30px;
  }

  .page-about .section__index {
    font-size: 64px;
  }
}

/* ---------- 悬停展开：仅在支持悬停的宽屏生效 ---------- */
@media (hover: hover) and (min-width: 900px) {
  .page-about .tl__more {
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    margin-top: 0;
    transition: max-height 240ms var(--ease), opacity 240ms var(--ease), margin-top 240ms var(--ease);
  }

  .page-about .tl__node:hover .tl__more,
  .page-about .tl__node:focus .tl__more {
    max-height: 220px;
    opacity: 1;
    margin-top: 10px;
  }
}

/* ---------- 窄屏兜底 ---------- */
@media (max-width: 420px) {
  .page-about .about-hero__aside {
    grid-template-columns: 1fr;
    gap: 18px;
  }

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

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

  .page-about .network-link,
  .page-about .codes-link,
  .page-about .cadence-link {
    word-break: break-word;
  }
}