.page-about {
  --about-soft: rgba(57, 230, 216, 0.08);
  --about-card: rgba(18, 41, 74, 0.55);
  display: block;
  padding-bottom: 48px;
}

.page-about p {
  margin: 0;
}

/* 面包屑 */
.page-about .about-crumb {
  margin-bottom: 22px;
}

.page-about .breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 13px;
  color: var(--muted);
}

.page-about .breadcrumb li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--line);
}

.page-about .breadcrumb a {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

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

/* 通用小标签 */
.page-about .about-kicker {
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--cyan);
  margin-bottom: 10px;
}

.page-about h1 {
  font-family: var(--font-title);
  font-weight: 800;
  font-size: clamp(30px, 7vw, 52px);
  line-height: 1.06;
  letter-spacing: -0.01em;
  color: var(--paper);
  margin: 0 0 18px;
}

.page-about h2 {
  font-family: var(--font-title);
  font-weight: 700;
  font-size: clamp(23px, 4.4vw, 34px);
  line-height: 1.15;
  letter-spacing: -0.005em;
  color: var(--paper);
  margin: 0 0 14px;
}

.page-about h3 {
  font-family: var(--font-title);
  font-weight: 700;
  font-size: 19px;
  line-height: 1.3;
  color: var(--paper);
  margin: 0 0 10px;
}

.page-about .about-sec__lead,
.page-about .about-team__lead {
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--muted);
  max-width: 60ch;
}

/* 首屏 */
.page-about .about-intro {
  display: grid;
  gap: 34px;
  padding-top: 6px;
}

.page-about .about-lead {
  font-size: 17px;
  line-height: 1.85;
  color: #cbdaec;
  max-width: 60ch;
}

.page-about .about-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 20px 34px;
  margin: 28px 0 0;
  padding: 22px 0 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.page-about .about-stats li {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .about-stats__n {
  font-size: 21px;
  color: var(--cyan);
  letter-spacing: 0.04em;
}

.page-about .about-stats__k {
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--muted);
}

/* 图片容器 */
.page-about .figure {
  margin: 0;
}

.page-about .figure__frame {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--deep);
  clip-path: polygon(0 0, calc(100% - 20px) 0, 100% 20px, 100% 100%, 0 100%);
}

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

.page-about .figure__frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: repeating-linear-gradient(180deg, rgba(57, 230, 216, 0.05) 0 1px, transparent 1px 5px);
  mix-blend-mode: screen;
}

.page-about .figure__cap {
  margin-top: 10px;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--muted);
}

/* 呼号块 */
.page-about .about-sec {
  margin-top: 44px;
}

.page-about .callout {
  position: relative;
  padding: 26px 22px;
  border: 1px solid var(--line);
  background: linear-gradient(140deg, var(--about-soft), rgba(10, 23, 48, 0.92) 58%);
  clip-path: polygon(0 0, calc(100% - 24px) 0, 100% 24px, 100% 100%, 24px 100%, 0 calc(100% - 24px));
}

.page-about .callout h2 {
  color: var(--cyan);
  margin-bottom: 16px;
}

.page-about .callout p {
  font-size: 15.5px;
  line-height: 1.85;
  color: #c8d8ea;
  max-width: 68ch;
}

.page-about .callout p + p {
  margin-top: 12px;
}

.page-about .callout__sig {
  margin-top: 20px;
  font-size: 11.5px;
  letter-spacing: 0.22em;
  color: var(--muted);
}

/* 时间线 */
.page-about .about-sec__head {
  display: grid;
  gap: 24px;
  margin-bottom: 26px;
}

.page-about .about-tl__fig {
  max-width: 220px;
}

.page-about .tl {
  position: relative;
  padding-top: 4px;
}

.page-about .tl__track {
  position: absolute;
  top: 8px;
  bottom: 8px;
  left: 17px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan) 0%, var(--line) 24%, var(--line) 100%);
  opacity: 0.9;
}

.page-about .tl__list {
  display: grid;
  gap: 16px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .tl__item {
  position: relative;
  padding-left: 46px;
}

.page-about .tl__dot {
  position: absolute;
  top: 21px;
  left: 12px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--abyss);
  border: 1px solid var(--cyan);
  box-shadow: 0 0 0 4px rgba(57, 230, 216, 0.1);
}

.page-about .tl__node {
  border: 1px solid var(--line);
  background: var(--about-card);
  clip-path: polygon(0 0, calc(100% - 14px) 0, 100% 14px, 100% 100%, 0 100%);
}

.page-about .tl__node[open] {
  background: rgba(18, 41, 74, 0.78);
}

.page-about .tl__sum {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
}

.page-about .tl__sum::-webkit-details-marker {
  display: none;
}

.page-about .tl__sum:hover .tl__title {
  color: var(--cyan);
}

.page-about .tl__year {
  font-size: 13.5px;
  letter-spacing: 0.1em;
  color: var(--cyan);
}

.page-about .tl__title {
  font-family: var(--font-title);
  font-size: 19px;
  letter-spacing: 0.01em;
  color: var(--paper);
}

.page-about .tl__hint {
  margin-left: auto;
  font-size: 10.5px;
  letter-spacing: 0.14em;
  color: var(--muted);
}

.page-about .tl__node[open] .tl__hint {
  color: var(--orange);
}

.page-about .tl__body {
  padding: 0 18px 18px;
  font-size: 14.5px;
  line-height: 1.8;
  color: #c3d3e6;
  max-width: 66ch;
}

/* 团队带 */
.page-about .about-team {
  margin-top: 56px;
  padding: 38px 0 40px;
  background: linear-gradient(180deg, rgba(10, 23, 48, 0.96), rgba(4, 7, 15, 0.2));
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .about-team__fig {
  margin-top: 24px;
}

.page-about .mix {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 26px;
}

.page-about .mix__seg {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 14px 16px;
  border: 1px solid var(--line);
  background: rgba(18, 41, 74, 0.6);
}

.page-about .mix__seg--a {
  border-left: 3px solid var(--cyan);
}

.page-about .mix__seg--b {
  border-left: 3px solid var(--orange);
}

.page-about .mix__seg--c {
  border-left: 3px solid var(--purple);
}

.page-about .mix__n {
  font-size: 21px;
  color: var(--paper);
  letter-spacing: 0.03em;
}

.page-about .mix__k {
  font-size: 14.5px;
  color: var(--paper);
}

.page-about .mix__ratio {
  font-size: 12.5px;
  color: var(--muted);
}

.page-about .team-notes {
  margin: 22px 0 0;
  padding: 0 0 0 18px;
  list-style: none;
}

.page-about .team-notes li {
  position: relative;
  padding-left: 16px;
  margin-bottom: 9px;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .team-notes li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 11px;
  width: 6px;
  height: 1px;
  background: var(--cyan);
}

/* 服务标准 */
.page-about .about-std .about-sec__lead {
  margin-bottom: 8px;
}

.page-about .about-std .ledger {
  margin-top: 20px;
}

.page-about .ledger__row {
  display: grid;
  gap: 6px;
  padding: 15px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .ledger__row:first-child {
  border-top: 1px solid var(--line);
}

.page-about .ledger__key {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.1em;
  color: var(--cyan);
}

.page-about .ledger__val {
  font-size: 15px;
  line-height: 1.75;
  color: var(--paper);
}

/* 长期在线 */
.page-about .reach {
  display: grid;
  gap: 16px;
  margin-top: 22px;
}

.page-about .reach__item {
  padding: 20px 18px;
  border: 1px solid var(--line);
  border-top: 3px solid var(--orange);
  background: rgba(10, 23, 48, 0.7);
  clip-path: polygon(0 0, calc(100% - 16px) 0, 100% 16px, 100% 100%, 0 100%);
}

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

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

.page-about .reach__t {
  font-family: var(--font-title);
  font-size: 18px;
  color: var(--paper);
  margin-bottom: 8px;
}

.page-about .reach__item p {
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-close {
  margin-top: 32px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
}

.page-about .about-close p {
  font-size: 15.5px;
  line-height: 1.9;
  color: #c8d8ea;
  max-width: 74ch;
}

.page-about .about-close__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

/* 平板与桌面 */
@media (min-width: 720px) {
  .page-about .about-sec__head {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: end;
    gap: 32px;
  }

  .page-about .about-tl__fig {
    max-width: 200px;
  }

  .page-about .mix {
    flex-direction: row;
    align-items: stretch;
    gap: 0;
    height: 96px;
  }

  .page-about .mix__seg {
    justify-content: center;
    border-left: none;
    border-top: 3px solid var(--cyan);
  }

  .page-about .mix__seg--a {
    flex: 12 1 0;
  }

  .page-about .mix__seg--b {
    flex: 14 1 0;
    border-top-color: var(--orange);
  }

  .page-about .mix__seg--c {
    flex: 6 1 0;
    border-top-color: var(--purple);
  }

  .page-about .ledger__row {
    grid-template-columns: 140px minmax(0, 1fr);
    gap: 20px;
    align-items: baseline;
  }

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

@media (min-width: 960px) {
  .page-about .about-intro {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: center;
    gap: 48px;
  }

  .page-about .about-sec {
    margin-top: 64px;
  }

  .page-about .about-team {
    margin-top: 76px;
    padding: 48px 0 52px;
  }

  /* 时间线偏心双列 */
  .page-about .tl__track {
    left: calc(50% - 0.5px);
  }

  .page-about .tl__list {
    grid-template-columns: 1fr 1fr;
    column-gap: 78px;
    row-gap: 22px;
    align-items: start;
  }

  .page-about .tl__item {
    padding-left: 0;
  }

  .page-about .tl__item:nth-child(odd) {
    grid-column: 1;
  }

  .page-about .tl__item:nth-child(even) {
    grid-column: 2;
  }

  .page-about .tl__item:nth-child(odd) .tl__dot {
    left: auto;
    right: -44px;
  }

  .page-about .tl__item:nth-child(even) .tl__dot {
    left: -44px;
  }

  .page-about .callout {
    padding: 34px 32px;
  }
}
<<<END>>>