.page-about {
  --about-cut: 18px;
  --about-line: 1px solid var(--ink-700);
  color: var(--text);
  font-family: var(--font-sans);
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  padding-top: 22px;
  font-size: 13px;
  color: var(--text-dim);
}

.page-about .breadcrumb a {
  color: var(--text-dim);
  text-decoration: none;
  transition: color var(--dur-fast) var(--ease);
}

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

.page-about .breadcrumb__current {
  color: var(--cyan);
  letter-spacing: 0.02em;
}

/* ---------- 通用标题组 ---------- */
.page-about .section-head__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .section-head__eyebrow::before {
  content: "";
  width: 22px;
  height: 2px;
  background: var(--cyan);
}

.page-about .section-head__title {
  margin: 10px 0 0;
  font-size: clamp(24px, 4.4vw, 40px);
  line-height: 1.16;
  letter-spacing: -0.015em;
  font-weight: 900;
  color: var(--paper);
}

.page-about .section-head__lead {
  margin: 12px 0 0;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--text-dim);
  max-width: 68ch;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: 30px 0 56px;
  background:
    radial-gradient(120% 90% at 88% 0%, rgba(22, 227, 201, 0.14), transparent 62%),
    linear-gradient(180deg, rgba(23, 53, 43, 0.5), transparent 78%);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 1px;
  background: linear-gradient(90deg, var(--cyan), var(--amber) 55%, var(--alert));
  opacity: 0.5;
}

.page-about .about-hero__inner {
  display: grid;
  gap: 34px;
}

.page-about .about-hero__text h1 {
  margin: 14px 0 0;
  font-size: clamp(30px, 7vw, 64px);
  line-height: 1.06;
  letter-spacing: -0.03em;
  font-weight: 900;
  color: var(--paper);
  max-width: 20ch;
}

.page-about .about-hero__lead {
  margin: 18px 0 0;
  font-size: 16px;
  line-height: 1.78;
  color: var(--text);
  max-width: 60ch;
}

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

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--ink-700);
  clip-path: polygon(0 0, calc(100% - var(--about-cut)) 0, 100% var(--about-cut), 100% 100%, var(--about-cut) 100%, 0 calc(100% - var(--about-cut)));
}

.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 16px;
  background: var(--ink-800);
}

.page-about .about-stat__value {
  font-family: var(--font-num);
  font-size: 34px;
  line-height: 1;
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--cyan);
}

.page-about .about-stat__unit {
  font-size: 0.5em;
  margin-left: 2px;
  letter-spacing: 0;
}

.page-about .about-stat__label {
  font-size: 12px;
  line-height: 1.55;
  color: var(--text-dim);
}

/* ---------- 起点与今天 ---------- */
.page-about .about-start {
  padding: 56px 0;
}

.page-about .about-start__grid {
  display: grid;
  gap: 30px;
}

.page-about .about-start__copy p {
  margin: 14px 0 0;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--text);
  max-width: 64ch;
}

.page-about .about-start__points {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-start__points li {
  position: relative;
  padding-left: 22px;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--text-dim);
}

.page-about .about-start__points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 10px;
  height: 2px;
  background: var(--cyan);
}

/* ---------- 图片容器 ---------- */
.page-about .media-frame {
  position: relative;
  margin: 0;
  background: var(--ink-800);
  overflow: hidden;
  clip-path: polygon(0 0, calc(100% - 20px) 0, 100% 20px, 100% 100%, 20px 100%, 0 calc(100% - 20px));
}

.page-about .media-frame__img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  background: var(--ink-700);
}

.page-about .media-frame__caption {
  padding: 12px 16px 14px;
  border-top: 1px solid var(--ink-700);
  font-size: 13px;
  line-height: 1.68;
  color: var(--text-dim);
}

.page-about .about-start__media .media-frame__img {
  aspect-ratio: 4 / 3;
}

/* ---------- 发展历程 ---------- */
.page-about .about-timeline {
  padding: 56px 0;
}

.page-about .about-timeline__grid {
  display: grid;
  gap: 38px;
  margin-top: 34px;
}

.page-about .about-track {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 18px;
}

.page-about .about-track__item {
  position: relative;
  padding: 2px 0 14px 26px;
  border-left: 2px solid var(--ink-600);
}

.page-about .about-track__item::before {
  content: "";
  position: absolute;
  left: -7px;
  top: 6px;
  width: 12px;
  height: 12px;
  background: var(--cyan);
  transform: rotate(45deg);
  transition: background var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .about-track__item:hover::before,
.page-about .about-track__item:focus-within::before {
  background: var(--cyan-bright);
  transform: rotate(45deg) scale(1.22);
}

.page-about .about-track__year {
  display: block;
  font-family: var(--font-num);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--cyan);
}

.page-about .about-track__body h3 {
  margin: 6px 0 6px;
  font-size: 17px;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .about-track__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.74;
  color: var(--text-dim);
}

.page-about .about-compare {
  background: var(--ink-800);
  border: var(--about-line);
  border-top: 3px solid var(--cyan-deep);
  padding: 20px 16px 14px;
}

.page-about .about-compare__title {
  margin: 0 0 14px;
  font-size: 14px;
  letter-spacing: 0.08em;
  color: var(--text);
}

.page-about .about-compare__scroll {
  overflow-x: auto;
}

.page-about .about-compare__table {
  width: 100%;
  min-width: 300px;
  border-collapse: collapse;
  font-size: 13px;
}

.page-about .about-compare__table th,
.page-about .about-compare__table td {
  padding: 10px 6px;
  text-align: center;
  border-bottom: 1px solid var(--ink-700);
}

.page-about .about-compare__table thead th {
  font-family: var(--font-num);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--text-soft);
  background: var(--ink-700);
}

.page-about .about-compare__table tbody th {
  text-align: left;
  white-space: nowrap;
  font-size: 13px;
  font-weight: 500;
  color: var(--text);
}

.page-about .about-compare__dot {
  display: inline-block;
  width: 12px;
  height: 12px;
  background: var(--ink-600);
  transform: rotate(45deg);
}

.page-about .about-compare__dot--on {
  background: var(--cyan);
}

/* ---------- 数据生产 ---------- */
.page-about .about-flow {
  padding: 56px 0;
  background: linear-gradient(180deg, transparent, rgba(12, 127, 114, 0.1) 40%, transparent);
}

.page-about .about-flow__grid {
  display: grid;
  gap: 28px;
  margin-top: 30px;
}

.page-about .about-flow__steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-step {
  position: relative;
  padding: 18px 18px 20px;
  background: var(--ink-800);
  border: var(--about-line);
  border-left: 3px solid var(--cyan-deep);
  clip-path: polygon(0 0, calc(100% - 16px) 0, 100% 16px, 100% 100%, 0 100%);
  transition: transform var(--dur) var(--ease), border-left-color var(--dur) var(--ease);
}

.page-about .about-step:hover,
.page-about .about-step:focus-within {
  transform: translateX(5px);
  border-left-color: var(--cyan);
}

.page-about .about-step__idx {
  font-family: var(--font-num);
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--cyan);
}

.page-about .about-step h3 {
  margin: 8px 0 6px;
  font-size: 17px;
  color: var(--paper);
}

.page-about .about-step p {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--text-dim);
}

.page-about .about-flow__media .media-frame__img {
  aspect-ratio: 3 / 2;
}

.page-about .about-flow__note {
  margin: 26px 0 0;
  padding: 14px 16px;
  border-left: 3px solid var(--amber);
  background: rgba(255, 176, 32, 0.09);
  font-size: 14px;
  line-height: 1.72;
  color: var(--text);
  max-width: 72ch;
}

/* ---------- 团队与分工 ---------- */
.page-about .about-team {
  padding: 56px 0;
}

.page-about .about-team__grid {
  display: grid;
  gap: 16px;
  margin-top: 30px;
}

.page-about .about-team__card {
  position: relative;
  padding: 26px 20px 22px;
  background: var(--ink-800);
  border: var(--about-line);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%);
  transition: background var(--dur) var(--ease), transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .about-team__card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--cyan);
}

.page-about .about-team__card--dev::before {
  background: var(--away);
}

.page-about .about-team__card--ops::before {
  background: var(--amber);
}

.page-about .about-team__card:hover,
.page-about .about-team__card:focus-visible {
  background: var(--ink-700);
  transform: translateY(-5px);
  outline: none;
  box-shadow: 0 0 0 2px var(--cyan);
}

.page-about .about-team__count {
  display: block;
  font-family: var(--font-num);
  font-size: 46px;
  line-height: 1;
  font-weight: 700;
  letter-spacing: -0.04em;
  color: var(--paper);
}

.page-about .about-team__role {
  margin: 14px 0 8px;
  font-size: 16px;
  letter-spacing: 0.02em;
  color: var(--cyan);
}

.page-about .about-team__duties {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.74;
  color: var(--text-dim);
}

/* ---------- 合作生态 ---------- */
.page-about .about-partners {
  padding: 56px 0;
}

.page-about .about-partners__wide {
  margin: 30px 0 22px;
}

.page-about .about-partners__wide .media-frame__img {
  aspect-ratio: 14 / 9;
}

.page-about .about-partners__grid {
  display: grid;
  gap: 16px;
}

.page-about .about-partners__card {
  background: var(--ink-800);
}

.page-about .about-partners__card .panel__inner {
  padding: 22px 20px;
}

.page-about .about-partners__num {
  display: block;
  font-family: var(--font-num);
  font-size: 40px;
  line-height: 1;
  font-weight: 700;
  color: var(--cyan);
}

.page-about .about-partners__card h3 {
  margin: 12px 0 8px;
  font-size: 17px;
  color: var(--paper);
}

.page-about .about-partners__card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--text-dim);
}

/* ---------- 我们坚持的做法 ---------- */
.page-about .about-principles {
  padding: 56px 0 76px;
}

.page-about .about-principles__panel {
  background: var(--paper);
  color: var(--ink-900);
  clip-path: polygon(0 0, calc(100% - 22px) 0, 100% 22px, 100% 100%, 22px 100%, 0 calc(100% - 22px));
}

.page-about .about-principles__panel .panel__inner {
  padding: 28px 22px 26px;
}

.page-about .about-principles__panel .section-head__eyebrow {
  color: var(--cyan-deep);
}

.page-about .about-principles__panel .section-head__eyebrow::before {
  background: var(--cyan-deep);
}

.page-about .about-principles__panel .section-head__title {
  color: var(--ink-900);
}

.page-about .about-principles__list {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 20px;
}

.page-about .about-principles__item {
  padding-top: 16px;
  border-top: 1px solid rgba(8, 21, 15, 0.14);
}

.page-about .about-principles__item p {
  margin: 12px 0 0;
  font-size: 15px;
  line-height: 1.76;
  color: var(--ink-600);
}

.page-about .about-principles__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.page-about .about-principles__panel .btn--ghost {
  color: var(--ink-900);
  border-color: var(--ink-900);
}

.page-about .about-principles__panel .btn--ghost:hover,
.page-about .about-principles__panel .btn--ghost:focus-visible {
  color: var(--paper);
  background: var(--ink-900);
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-flow__grid {
    grid-template-columns: minmax(0, 3fr) minmax(0, 2fr);
    align-items: start;
    gap: 32px;
  }

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

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

  .page-about .about-principles__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 24px;
  }
}

@media (min-width: 960px) {
  .page-about .about-hero {
    padding: 44px 0 76px;
  }

  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 3fr) minmax(0, 2fr);
    align-items: end;
    gap: 52px;
  }

  .page-about .about-start__grid {
    grid-template-columns: minmax(0, 3fr) minmax(0, 2fr);
    align-items: start;
    gap: 44px;
  }

  .page-about .about-timeline__grid {
    grid-template-columns: minmax(0, 3fr) minmax(0, 2fr);
    align-items: start;
    gap: 44px;
  }

  .page-about .about-track {
    gap: 22px;
  }

  .page-about .about-track__item:nth-child(2) {
    margin-left: 26px;
  }

  .page-about .about-track__item:nth-child(3) {
    margin-left: 52px;
  }

  .page-about .about-track__item:nth-child(4) {
    margin-left: 78px;
  }

  .page-about .about-compare {
    padding: 24px 20px 16px;
  }

  .page-about .about-principles__panel .panel__inner {
    padding: 40px 36px 36px;
  }
}

@media (min-width: 1180px) {
  .page-about .about-track__item:nth-child(2) {
    margin-left: 34px;
  }

  .page-about .about-track__item:nth-child(3) {
    margin-left: 68px;
  }

  .page-about .about-track__item:nth-child(4) {
    margin-left: 102px;
  }
}