.page-about {
  --about-dim: #BCCBE0;
  background: var(--ink);
  color: var(--paper);
  padding-bottom: clamp(40px, 7vw, 88px);
  overflow-x: clip;
}

.page-about .breadcrumb {
  padding-top: clamp(18px, 3vw, 28px);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--mist);
}

.page-about .breadcrumb a {
  color: var(--mist);
  text-decoration: none;
}

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

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  padding-block: clamp(20px, 4vw, 40px) clamp(28px, 5vw, 56px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -140px;
  right: -30%;
  width: min(760px, 100vw);
  height: 520px;
  background: radial-gradient(closest-side, rgba(255, 107, 53, 0.2), rgba(255, 107, 53, 0) 72%);
  pointer-events: none;
  z-index: 0;
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(22px, 4vw, 36px);
}

.page-about .about-hero .eyebrow {
  margin: 0 0 10px;
  color: var(--mist);
}

.page-about .hero-title {
  font-family: var(--font-display);
  font-size: clamp(38px, 8.2vw, 86px);
  line-height: 0.98;
  letter-spacing: -0.01em;
  font-weight: 800;
  margin: 0 0 clamp(16px, 3vw, 24px);
  transform: skewX(-4deg);
  transform-origin: left bottom;
}

.page-about .hero-title__accent {
  color: var(--orange);
  display: inline-block;
}

.page-about .about-hero__lede {
  max-width: 36em;
  color: var(--about-dim);
  line-height: 1.85;
  margin: 0;
}

.page-about .about-hero__aside {
  border-left: var(--line);
  padding-left: 16px;
  display: flex;
  gap: 14px;
  align-items: flex-start;
}

.page-about .about-hero__aside .annot {
  writing-mode: vertical-rl;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--orange);
  font-family: var(--font-num);
  font-size: 11px;
  margin: 0;
  white-space: nowrap;
}

.page-about .about-hero__aside p {
  margin: 0;
  font-size: 13px;
  line-height: 1.9;
  color: var(--mist);
  max-width: 20em;
}

/* ---------- 数据窄带 ---------- */

.page-about .stat-strip {
  list-style: none;
  margin: clamp(26px, 5vw, 44px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--ink-line);
  border: var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .stat {
  background: var(--ink-mid);
  padding: 14px 16px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .stat .num {
  font-family: var(--font-num);
  font-size: clamp(24px, 3.6vw, 34px);
  line-height: 1;
  color: var(--paper);
}

.page-about .stat--key .num {
  color: var(--orange);
}

.page-about .stat-label {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--mist);
}

/* ---------- 章节公共 ---------- */

.page-about .about-section {
  padding-block: clamp(34px, 5vw, 60px);
}

.page-about .about-head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 6px 14px;
  align-items: baseline;
  border-top: var(--line);
  padding-top: 14px;
  margin-bottom: clamp(20px, 3vw, 32px);
}

.page-about .about-head__num {
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--orange);
}

.page-about .about-h2 {
  font-family: var(--font-display);
  font-size: clamp(24px, 4.6vw, 42px);
  line-height: 1.08;
  letter-spacing: -0.01em;
  margin: 0;
  color: var(--paper);
}

.page-about .about-sub {
  grid-column: 2;
  margin: 6px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
  max-width: 44em;
}

.page-about .about-body p {
  margin: 0 0 1em;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.85;
  max-width: 38em;
  color: var(--paper);
}

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

/* ---------- 图片 ---------- */

.page-about .about-figure {
  margin: 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border: var(--line);
  border-radius: var(--radius);
  object-fit: cover;
  background: var(--ink-mid);
}

.page-about .about-figure figcaption {
  margin-top: 10px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--mist);
  line-height: 1.7;
}

.page-about .about-figure--team {
  margin-bottom: clamp(22px, 4vw, 34px);
  max-width: 880px;
}

.page-about .about-figure--banner {
  margin-bottom: clamp(24px, 4vw, 40px);
}

/* ---------- 01 自述 ---------- */

.page-about .about-intro__grid {
  display: grid;
  gap: clamp(20px, 4vw, 36px);
}

.page-about .pull-quote {
  margin: 0;
  background: var(--ink-mid);
  border: var(--line);
  border-left: 4px solid var(--orange);
  border-radius: var(--radius);
  padding: 22px 20px 18px;
  box-shadow: var(--shadow-hard);
}

.page-about .pull-quote p {
  font-family: var(--font-display);
  font-size: clamp(19px, 2.6vw, 26px);
  line-height: 1.35;
  margin: 0 0 12px;
  color: var(--paper);
}

.page-about .pull-quote cite {
  font-style: normal;
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--mist);
}

/* ---------- 02 团队 ---------- */

.page-about .team-grid {
  display: grid;
  gap: 14px;
}

.page-about .role {
  background: var(--ink-mid);
  border: var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
  transition: border-color 0.24s var(--ease), transform 0.24s var(--ease);
}

.page-about .role:hover {
  border-color: var(--orange);
  transform: translateY(-2px);
}

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

.page-about .role summary {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 12px;
  align-items: center;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .role summary::after {
  content: "+";
  font-family: var(--font-num);
  font-size: 18px;
  line-height: 1;
  color: var(--mist);
}

.page-about .role[open] summary::after {
  content: "–";
  color: var(--orange);
}

.page-about .role summary:focus-visible {
  outline: 2px solid var(--orange);
  outline-offset: 2px;
}

.page-about .role__num {
  font-family: var(--font-num);
  font-size: clamp(22px, 3vw, 30px);
  line-height: 1;
  color: var(--orange);
}

.page-about .role__name {
  font-size: 16px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .role__body {
  padding: 0 18px 18px;
}

.page-about .role__body p {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--about-dim);
}

/* ---------- 03 历程 ---------- */

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

.page-about .hist::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: var(--ink-line);
}

.page-about .hist__item {
  position: relative;
  padding-left: 34px;
  padding-bottom: clamp(22px, 3vw, 32px);
}

.page-about .hist__item:last-child {
  padding-bottom: 0;
}

.page-about .hist__item::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 9px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--orange);
  transition: background 0.24s var(--ease), box-shadow 0.24s var(--ease);
}

.page-about .hist__item:hover::before,
.page-about .hist__item:focus-within::before {
  background: var(--orange);
  box-shadow: 0 0 0 5px rgba(255, 107, 53, 0.18);
}

.page-about .hist__year {
  display: block;
  font-family: var(--font-num);
  font-size: clamp(26px, 4vw, 38px);
  line-height: 1;
  color: var(--orange);
  letter-spacing: -0.02em;
  margin-bottom: 6px;
}

.page-about .hist__body h3 {
  margin: 0 0 6px;
  font-size: 17px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .hist__body p {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--about-dim);
  max-width: 40em;
}

/* ---------- 04 流程 ---------- */

.page-about .about-process__grid {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
}

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

.page-about .flow__step {
  position: relative;
  padding-left: 36px;
}

.page-about .flow__step::before {
  content: "";
  position: absolute;
  left: 10px;
  top: 8px;
  bottom: 0;
  width: 1px;
  background: var(--ink-line);
}

.page-about .flow__step:last-child::before {
  display: none;
}

.page-about .flow__step::after {
  content: "";
  position: absolute;
  left: 4px;
  top: 16px;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--orange);
  transition: background 0.24s var(--ease);
}

.page-about .flow__step:has(details[open])::after {
  background: var(--orange);
}

.page-about .flow details {
  border-bottom: var(--line);
}

.page-about .flow summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 12px;
  padding: 12px 0;
  cursor: pointer;
  list-style: none;
}

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

.page-about .flow summary:focus-visible {
  outline: 2px solid var(--orange);
  outline-offset: 2px;
}

.page-about .flow__idx {
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--orange);
}

.page-about .flow__title {
  font-size: 17px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .flow__time {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--mist);
  background: var(--ink-mid);
  border: var(--line);
  border-radius: var(--radius-pill);
  padding: 2px 10px;
}

.page-about .flow__body {
  padding: 0 0 16px;
}

.page-about .flow__body p {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--about-dim);
  max-width: 36em;
}

.page-about .about-figure--side img {
  border-radius: var(--radius);
}

/* ---------- 05 专栏 ---------- */

.page-about .about-column__grid {
  display: grid;
  gap: clamp(22px, 4vw, 38px);
}

.page-about .column-badge {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 10px;
  border-left: 1px solid var(--ink-line);
  padding-left: 16px;
}

.page-about .column-count {
  font-family: var(--font-num);
  font-size: clamp(58px, 11vw, 104px);
  line-height: 0.85;
  letter-spacing: -0.03em;
  color: var(--orange);
}

.page-about .column-badge__note {
  margin: 0;
  font-size: 13px;
  line-height: 1.8;
  color: var(--mist);
  max-width: 18em;
}

.page-about .topic-list {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .topic-list li {
  border-left: 2px solid var(--ink-line);
  padding: 2px 0 2px 12px;
}

.page-about .topic-list strong {
  display: block;
  font-size: 15px;
  color: var(--paper);
  margin-bottom: 2px;
}

.page-about .topic-list span {
  font-size: 13px;
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- 06 标准 ---------- */

.page-about .std-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--ink-line);
  border: var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .std-list li {
  background: var(--ink-mid);
  padding: 18px clamp(16px, 3vw, 26px);
}

.page-about .std-list h3 {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 6px;
  font-size: 16px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .std-list h3::before {
  content: "";
  flex: none;
  width: 7px;
  height: 7px;
  background: var(--orange);
  transform: rotate(45deg);
}

.page-about .std-list p {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--about-dim);
}

/* ---------- 收尾 ---------- */

.page-about .about-cta {
  position: relative;
  overflow: hidden;
  background: var(--ink-deep);
  border: var(--line);
  border-radius: var(--radius);
  padding: clamp(24px, 5vw, 48px);
  box-shadow: var(--shadow-float);
}

.page-about .about-cta::after {
  content: "";
  position: absolute;
  right: -70px;
  top: -70px;
  width: 220px;
  height: 220px;
  border: 1px solid var(--ink-line);
  border-radius: 50%;
  pointer-events: none;
}

.page-about .about-cta h2 {
  position: relative;
  font-family: var(--font-display);
  font-size: clamp(24px, 4vw, 38px);
  line-height: 1.1;
  margin: 0 0 12px;
  color: var(--paper);
}

.page-about .about-cta p {
  position: relative;
  margin: 0 0 20px;
  max-width: 44em;
  font-size: 15px;
  line-height: 1.85;
  color: var(--about-dim);
}

.page-about .about-cta__actions {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 18px;
}

.page-about .about-cta__link {
  font-size: 14px;
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid var(--ink-line);
  padding-bottom: 2px;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .about-cta__link:hover,
.page-about .about-cta__link:focus-visible {
  color: var(--orange);
  border-color: var(--orange);
}

/* ---------- 响应式 ---------- */

@media (min-width: 640px) {
  .page-about .stat-strip {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

@media (min-width: 760px) {
  .page-about .team-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
  }
}

@media (min-width: 880px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1fr) 220px;
    align-items: end;
  }

  .page-about .about-intro__grid {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 0.7fr);
    align-items: start;
  }

  .page-about .about-column__grid {
    grid-template-columns: 220px minmax(0, 1fr);
    align-items: start;
  }

  .page-about .hist::before {
    left: 128px;
  }

  .page-about .hist__item {
    display: grid;
    grid-template-columns: 104px minmax(0, 1fr);
    column-gap: 42px;
    padding-left: 0;
  }

  .page-about .hist__item::before {
    left: 123px;
    top: 10px;
  }

  .page-about .hist__year {
    margin-bottom: 0;
    text-align: right;
  }
}

@media (min-width: 900px) {
  .page-about .about-process__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: start;
  }

  .page-about .about-figure--side {
    position: sticky;
    top: 104px;
  }
}

@media (min-width: 1100px) {
  .page-about .team-grid {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    gap: 20px;
  }

  .page-about .role:nth-child(1) {
    grid-column: 1 / span 7;
  }

  .page-about .role:nth-child(2) {
    grid-column: 8 / span 5;
    margin-top: 34px;
  }

  .page-about .role:nth-child(3) {
    grid-column: 1 / span 5;
  }

  .page-about .role:nth-child(4) {
    grid-column: 7 / span 6;
    margin-top: -18px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .role,
  .page-about .hist__item::before,
  .page-about .flow__step::after,
  .page-about .about-cta__link {
    transition: none;
  }

  .page-about .hero-title {
    transform: none;
  }
}