.page-about {
  --about-line: 1px solid var(--c-grid);
  background: var(--c-void);
  color: var(--c-cloud);
  overflow-x: hidden;
}

.page-about .section {
  padding: clamp(56px, 8vw, 104px) 0;
}

.page-about .section--deep {
  background: var(--c-deep);
  border-top: var(--about-line);
  border-bottom: var(--about-line);
}

.page-about .section-head {
  max-width: 64ch;
}

.page-about .section-title {
  margin: var(--sp-3) 0 0;
  font-size: clamp(1.5rem, 4.2vw, 1.75rem);
  font-weight: 800;
  line-height: 1.22;
  letter-spacing: -0.01em;
}

.page-about .section-note {
  margin: var(--sp-4) 0 0;
  font-size: var(--fs-2);
  line-height: 1.8;
  color: var(--c-muted);
}

.page-about .about-sec-num {
  font-family: var(--f-mono);
  font-size: var(--fs-1);
  letter-spacing: 0.14em;
  color: var(--c-cyan);
  margin-right: 10px;
}

.page-about .about-link {
  color: var(--c-cyan);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

.page-about .about-link:hover {
  color: var(--c-cloud);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(28px, 4vw, 48px) 0 clamp(48px, 7vw, 88px);
  border-bottom: var(--about-line);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -34%;
  right: -14%;
  width: min(880px, 118vw);
  height: min(880px, 118vw);
  background: linear-gradient(118deg, rgba(51, 240, 208, 0.17) 0%, rgba(51, 240, 208, 0.05) 34%, rgba(51, 240, 208, 0) 54%);
  clip-path: polygon(34% 0, 100% 0, 100% 100%, 0 100%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: -8%;
  bottom: 20%;
  width: 116%;
  height: 1px;
  background: linear-gradient(90deg, rgba(51, 240, 208, 0) 0%, rgba(51, 240, 208, 0.42) 32%, rgba(51, 240, 208, 0.06) 72%, rgba(51, 240, 208, 0) 100%);
  transform: rotate(-3deg);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
}

.page-about .about-hero .eyebrow {
  margin-top: var(--sp-6);
}

.page-about .about-hero h1 {
  margin: var(--sp-4) 0 0;
  max-width: 19ch;
  font-size: clamp(1.85rem, 6.4vw, 3.4rem);
  font-weight: 800;
  line-height: 1.14;
  letter-spacing: -0.015em;
}

.page-about .about-hero__lede {
  margin: var(--sp-5) 0 0;
  max-width: 46ch;
  font-size: var(--fs-3);
  line-height: 1.78;
  color: var(--c-cloud);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: var(--sp-7) 0 0;
  padding: 0;
  list-style: none;
  background: var(--c-grid);
  border: var(--about-line);
}

.page-about .about-hero__stats > li {
  background: var(--c-void);
  padding: var(--sp-5) var(--sp-4);
}

.page-about .about-hero__num {
  display: block;
  font-family: var(--f-mono);
  font-size: var(--fs-stat);
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: 0.02em;
  font-variant-numeric: tabular-nums;
  color: var(--c-cyan);
}

.page-about .about-hero__stats > li:nth-child(2n) .about-hero__num {
  color: var(--c-orange);
}

.page-about .about-hero__label {
  display: block;
  margin-top: var(--sp-2);
  font-size: var(--fs-2);
  line-height: 1.6;
  color: var(--c-muted);
}

/* ---------- 章节目录 ---------- */

.page-about .about-toc {
  background: var(--c-deep);
  border-bottom: var(--about-line);
}

.page-about .about-toc__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--sp-2) var(--sp-5);
  padding-top: var(--sp-4);
  padding-bottom: var(--sp-4);
}

.page-about .about-toc .toc-title {
  margin: 0;
  font-family: var(--f-mono);
  font-size: var(--fs-1);
  letter-spacing: 0.16em;
  color: var(--c-muted);
}

.page-about .about-toc__list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-2) var(--sp-5);
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-toc .toc-link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 4px 0;
  font-size: var(--fs-2);
  color: var(--c-cloud);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.16s var(--ease), border-color 0.16s var(--ease);
}

.page-about .about-toc .toc-link:hover,
.page-about .about-toc .toc-link[aria-current="true"] {
  color: var(--c-cyan);
  border-bottom-color: var(--c-cyan);
}

.page-about .about-toc .toc-num {
  font-family: var(--f-mono);
  font-size: var(--fs-1);
  letter-spacing: 0.08em;
  color: var(--c-muted);
}

/* ---------- 团队构成 ---------- */

.page-about .about-team__layout {
  display: grid;
  gap: var(--sp-6);
  margin-top: var(--sp-7);
}

.page-about .role-grid {
  display: grid;
  gap: var(--sp-4);
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .role-card {
  padding: var(--sp-5);
  background: var(--c-void);
  border: var(--about-line);
  border-top: 2px solid var(--role-accent, var(--c-cyan));
  transition: transform 0.18s var(--ease), border-color 0.18s var(--ease);
}

.page-about .role-card--product {
  --role-accent: var(--c-cyan);
}

.page-about .role-card--data {
  --role-accent: var(--c-blue);
}

.page-about .role-card--ui {
  --role-accent: var(--c-orange);
}

.page-about .role-card--ops {
  --role-accent: var(--c-cloud);
}

.page-about .role-card:hover,
.page-about .role-card:focus-within {
  transform: translateY(-3px);
  border-color: var(--role-accent, var(--c-cyan));
}

.page-about .role-card__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--sp-3);
}

.page-about .role-card__title {
  margin: 0;
  font-size: var(--fs-3);
  font-weight: 700;
  line-height: 1.3;
}

.page-about .role-card__count {
  margin: 0;
  font-family: var(--f-mono);
  font-size: var(--fs-4);
  font-weight: 600;
  line-height: 1;
  letter-spacing: 0.02em;
  font-variant-numeric: tabular-nums;
  color: var(--role-accent, var(--c-cyan));
}

.page-about .role-card__count span {
  margin-left: 2px;
  font-size: var(--fs-1);
  font-weight: 400;
  color: var(--c-muted);
}

.page-about .role-card__text {
  margin: var(--sp-4) 0 0;
  font-size: var(--fs-2);
  line-height: 1.78;
  color: var(--c-muted);
  transition: color 0.18s var(--ease);
}

.page-about .role-card:hover .role-card__text,
.page-about .role-card:focus-within .role-card__text {
  color: var(--c-cloud);
}

.page-about .about-team__media {
  margin: 0;
  border: var(--about-line);
  background: var(--c-deep);
}

.page-about .about-team__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 9 / 11;
  object-fit: cover;
}

.page-about .about-team__media .media-caption {
  padding: var(--sp-3) var(--sp-4);
  border-top: var(--about-line);
  font-size: var(--fs-1);
  line-height: 1.7;
  color: var(--c-muted);
}

/* ---------- 四步流程 ---------- */

.page-about .flow-line {
  display: none;
  width: 100%;
  height: 96px;
  margin-top: var(--sp-7);
  margin-bottom: calc(-1 * var(--sp-5));
}

.page-about .steps {
  display: grid;
  gap: var(--sp-4);
  margin: var(--sp-6) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .step {
  padding: var(--sp-5);
  background: var(--c-void);
  border: var(--about-line);
  border-left: 2px solid var(--c-cyan);
}

.page-about .step:nth-child(2) {
  border-left-color: var(--c-blue);
}

.page-about .step:nth-child(3) {
  border-left-color: var(--c-cyan);
}

.page-about .step:nth-child(4) {
  border-left-color: var(--c-orange);
}

.page-about .step__num {
  margin: 0;
  font-family: var(--f-mono);
  font-size: var(--fs-1);
  letter-spacing: 0.18em;
  color: var(--c-muted);
}

.page-about .step__title {
  margin: var(--sp-3) 0 0;
  font-size: var(--fs-3);
  font-weight: 700;
  line-height: 1.3;
}

.page-about .step__text {
  margin: var(--sp-3) 0 0;
  font-size: var(--fs-2);
  line-height: 1.78;
  color: var(--c-muted);
}

.page-about .about-flow__media {
  margin: var(--sp-6) 0 0;
  border: var(--about-line);
}

.page-about .about-flow__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 2 / 1;
  object-fit: cover;
}

.page-about .about-flow__media .media-caption {
  padding: var(--sp-3) var(--sp-4);
  border-top: var(--about-line);
  font-size: var(--fs-1);
  line-height: 1.7;
  color: var(--c-muted);
}

/* ---------- 时间轴 ---------- */

.page-about .about-timeline__banner {
  margin: var(--sp-7) 0 0;
  border: var(--about-line);
}

.page-about .about-timeline__banner img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 5 / 2;
  object-fit: cover;
}

.page-about .timeline {
  position: relative;
  display: grid;
  gap: var(--sp-6);
  margin: var(--sp-7) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 0.55rem;
  bottom: 0.55rem;
  width: 1px;
  background: linear-gradient(180deg, var(--c-cyan) 0%, var(--c-grid) 58%, rgba(34, 48, 79, 0) 100%);
}

.page-about .timeline-item {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--sp-2);
  padding-left: 1.75rem;
}

.page-about .timeline-item::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 0.3rem;
  width: 9px;
  height: 9px;
  margin-left: -4px;
  background: var(--c-void);
  border: 1px solid var(--c-cyan);
  transform: rotate(45deg);
}

.page-about .timeline-year {
  margin: 0;
  font-family: var(--f-mono);
  font-size: var(--fs-2);
  font-weight: 600;
  letter-spacing: 0.06em;
  line-height: 1.2;
  font-variant-numeric: tabular-nums;
  color: var(--c-cyan);
}

.page-about .timeline-title {
  margin: 0;
  font-size: var(--fs-3);
  font-weight: 700;
  line-height: 1.3;
}

.page-about .timeline-text {
  margin: var(--sp-2) 0 0;
  max-width: 62ch;
  font-size: var(--fs-2);
  line-height: 1.8;
  color: var(--c-muted);
}

/* ---------- 刷新与复核 ---------- */

.page-about .metrics {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: var(--sp-7);
  background: var(--c-grid);
  border: var(--about-line);
}

.page-about .metric {
  padding: var(--sp-5) var(--sp-4);
  background: var(--c-void);
}

.page-about .metric__value {
  margin: 0;
  font-family: var(--f-mono);
  font-size: var(--fs-4);
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: 0.01em;
  font-variant-numeric: tabular-nums;
  color: var(--c-cyan);
}

.page-about .metric__value--orange {
  color: var(--c-orange);
}

.page-about .metric__label {
  margin: var(--sp-3) 0 0;
  font-size: var(--fs-2);
  line-height: 1.7;
  color: var(--c-muted);
}

.page-about .quality-note {
  margin: var(--sp-6) 0 0;
  max-width: 64ch;
  font-size: var(--fs-2);
  line-height: 1.85;
  color: var(--c-muted);
}

/* ---------- 服务范围 ---------- */

.page-about .coverage-grid {
  display: grid;
  gap: var(--sp-4);
  margin: var(--sp-7) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .coverage-card {
  padding: var(--sp-5);
  background: var(--c-void);
  border: var(--about-line);
}

.page-about .coverage-card__num {
  margin: 0;
  font-family: var(--f-mono);
  font-size: var(--fs-5);
  font-weight: 600;
  line-height: 0.95;
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
  color: var(--c-orange);
}

.page-about .coverage-card__num span {
  margin-left: 4px;
  font-size: var(--fs-3);
  font-weight: 500;
  color: var(--c-muted);
}

.page-about .coverage-card__title {
  margin: var(--sp-4) 0 0;
  font-size: var(--fs-3);
  font-weight: 700;
  line-height: 1.3;
  color: var(--c-cloud);
}

.page-about .coverage-card__text {
  margin: var(--sp-3) 0 0;
  font-size: var(--fs-2);
  line-height: 1.78;
  color: var(--c-muted);
}

.page-about .coverage-note {
  margin: var(--sp-6) 0 0;
  max-width: 64ch;
  font-size: var(--fs-2);
  line-height: 1.85;
  color: var(--c-cloud);
}

/* ---------- 联络 ---------- */

.page-about .about-join {
  position: relative;
  border-top: var(--about-line);
}

.page-about .about-join::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: min(420px, 60vw);
  background: linear-gradient(96deg, rgba(255, 122, 51, 0.12) 0%, rgba(255, 122, 51, 0) 72%);
  pointer-events: none;
}

.page-about .about-join__inner {
  position: relative;
  z-index: 1;
}

.page-about .about-join__text {
  margin: var(--sp-5) 0 0;
  max-width: 58ch;
  font-size: var(--fs-3);
  line-height: 1.8;
  color: var(--c-cloud);
}

.page-about .about-join__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-3);
  margin-top: var(--sp-6);
}

.page-about .about-join__mail {
  margin: var(--sp-5) 0 0;
  font-size: var(--fs-2);
  line-height: 1.8;
  color: var(--c-muted);
}

/* ---------- 响应式 ---------- */

@media (min-width: 600px) {
  .page-about .role-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 760px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .coverage-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1px;
    background: var(--c-grid);
    border: var(--about-line);
  }

  .page-about .coverage-card {
    border: 0;
  }

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

@media (min-width: 900px) {
  .page-about .about-team__layout {
    grid-template-columns: minmax(0, 1fr) 320px;
    gap: var(--sp-7);
    align-items: start;
  }
}

@media (min-width: 860px) {
  .page-about .flow-line {
    display: block;
  }

  .page-about .steps {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 1px;
    background: var(--c-grid);
    border: var(--about-line);
  }

  .page-about .step {
    border: 0;
  }
}

@media (min-width: 720px) {
  .page-about .timeline {
    gap: var(--sp-7);
  }

  .page-about .timeline::before {
    left: 4.9rem;
  }

  .page-about .timeline-item {
    grid-template-columns: 4.4rem minmax(0, 1fr);
    gap: 0 var(--sp-5);
    padding-left: 0;
  }

  .page-about .timeline-item::before {
    left: 4.9rem;
    top: 0.45rem;
    margin-left: -4.5px;
  }

  .page-about .timeline-year {
    font-size: var(--fs-3);
    text-align: right;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .role-card,
  .page-about .role-card__text,
  .page-about .about-toc .toc-link {
    transition: none;
  }

  .page-about .role-card:hover,
  .page-about .role-card:focus-within {
    transform: none;
  }
}