.page-about {
  --about-rail: 92px;
  background: var(--paper);
  color: var(--navy);
  font-family: var(--font-body);
  line-height: 1.6;
  overflow-x: hidden;
}

.page-about h1,
.page-about h2,
.page-about h3 {
  font-family: var(--font-head);
  font-weight: 900;
  letter-spacing: -0.02em;
  margin: 0;
}

.page-about p {
  margin: 0;
}

.page-about a:focus-visible,
.page-about summary:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 3px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  background: var(--navy);
  color: var(--paper);
  padding: clamp(1.75rem, 5vw, 3rem) 0 clamp(2.25rem, 6vw, 4rem);
  border-bottom: 2px solid var(--flame);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(135deg, rgba(228, 87, 46, 0.16) 0%, transparent 42%),
    repeating-linear-gradient(90deg, rgba(216, 222, 227, 0.07) 0 1px, transparent 1px 96px);
  pointer-events: none;
}

.page-about .about-hero .wrap {
  position: relative;
}

.page-about .breadcrumbs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  list-style: none;
  margin: 0 0 clamp(1.25rem, 3vw, 2rem);
  padding: 0;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  color: var(--mist);
}

.page-about .breadcrumbs__item + .breadcrumbs__item::before {
  content: "/";
  margin-right: 0.5rem;
  color: var(--steel);
}

.page-about .breadcrumbs__link {
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease);
}

.page-about .breadcrumbs__link:hover {
  color: var(--flame);
  border-bottom-color: var(--flame);
}

.page-about .hero-grid {
  display: grid;
  gap: clamp(1.5rem, 4vw, 2.5rem);
}

.page-about .hero-rail {
  display: flex;
  gap: 0.4rem;
  overflow-x: auto;
  padding-bottom: 0.5rem;
  scrollbar-width: thin;
}

.page-about .rail-link {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  color: var(--mist);
  text-decoration: none;
  padding: 0.3rem 0.55rem;
  border: 1px solid var(--line-dark);
  transition: color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease), background var(--t-fast) var(--ease);
}

.page-about .rail-link:hover {
  color: var(--ink);
  background: var(--flame);
  border-color: var(--flame);
}

.page-about .eyebrow {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--flame);
  margin-bottom: 0.85rem;
}

.page-about .hero-copy h1 {
  font-size: clamp(1.85rem, 6.2vw, 3.9rem);
  line-height: 1.08;
  color: var(--paper);
  max-width: 22ch;
}

.page-about .lede {
  margin-top: clamp(0.9rem, 2.2vw, 1.35rem);
  max-width: 60ch;
  font-size: clamp(0.95rem, 2.2vw, 1.06rem);
  line-height: 1.65;
  color: var(--mist);
}

.page-about .hero-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: clamp(1.5rem, 4vw, 2.25rem);
  background: var(--line-dark);
  border: 1px solid var(--line-dark);
}

.page-about .hero-facts .stat {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  padding: 0.85rem 0.9rem;
  background: var(--navy);
}

.page-about .hero-facts .stat__value {
  font-family: var(--font-mono);
  font-size: clamp(1.35rem, 4vw, 1.9rem);
  font-weight: 700;
  letter-spacing: 0.02em;
  line-height: 1.1;
  color: var(--amber);
}

.page-about .hero-facts .stat__label {
  font-size: 0.76rem;
  letter-spacing: 0.04em;
  color: var(--mist);
}

/* ---------- 章节骨架 ---------- */
.page-about .chapter {
  padding: clamp(2.25rem, 6vw, 4.25rem) 0;
  border-top: 1px solid var(--line-light);
}

.page-about .chapter--dark {
  background: var(--navy);
  color: var(--paper);
  border-top-color: rgba(216, 222, 227, 0.14);
}

.page-about .chapter-head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 0.75rem 1.1rem;
  align-items: start;
  padding-bottom: clamp(1rem, 2.5vw, 1.4rem);
  margin-bottom: clamp(1.4rem, 3.5vw, 2.25rem);
  border-bottom: 2px solid var(--flame);
}

.page-about .chapter-num {
  font-family: var(--font-mono);
  font-size: clamp(2rem, 7vw, 3.4rem);
  font-weight: 700;
  line-height: 0.9;
  color: var(--flame);
  letter-spacing: -0.03em;
}

.page-about .chapter-kicker {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--pitch);
  margin-bottom: 0.4rem;
}

.page-about .chapter--dark .chapter-kicker {
  color: var(--amber);
}

.page-about .chapter-title {
  font-size: clamp(1.3rem, 4.2vw, 2.35rem);
  line-height: 1.14;
}

.page-about .chapter-lede {
  max-width: 68ch;
  margin-bottom: clamp(1.25rem, 3vw, 1.9rem);
  font-size: clamp(0.94rem, 2.1vw, 1.02rem);
  color: var(--mist);
}

/* ---------- 图片 ---------- */
.page-about .shot {
  margin: 0;
  border: 1px solid var(--line-light);
  background: var(--navy);
}

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

.page-about .shot figcaption {
  padding: 0.7rem 0.85rem;
  font-size: 0.78rem;
  line-height: 1.5;
  letter-spacing: 0.02em;
  color: var(--steel);
  background: var(--paper);
  border-top: 1px solid var(--line-light);
}

.page-about .shot--dark,
.page-about .chapter--dark .shot {
  border-color: var(--line-dark);
}

.page-about .chapter--dark .shot figcaption {
  color: var(--mist);
  background: var(--ink);
  border-top-color: var(--line-dark);
}

/* ---------- 年轮 ---------- */
.page-about .origin-grid {
  display: grid;
  gap: clamp(1.5rem, 4vw, 2.5rem);
}

.page-about .timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 1.75rem;
  position: relative;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 0.28rem;
  top: 0.45rem;
  bottom: 0.6rem;
  width: 2px;
  background: linear-gradient(180deg, var(--flame) 0%, var(--pitch) 100%);
}

.page-about .timeline__item {
  position: relative;
  padding-bottom: clamp(1.1rem, 2.8vw, 1.6rem);
}

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

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: -1.75rem;
  top: 0.4rem;
  width: 0.6rem;
  height: 0.6rem;
  background: var(--paper);
  border: 2px solid var(--flame);
  border-radius: 50%;
  transform: translateX(1px);
}

.page-about .timeline__year {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--flame);
  margin-bottom: 0.25rem;
}

.page-about .timeline__body h3 {
  font-size: clamp(1rem, 2.6vw, 1.14rem);
  line-height: 1.3;
  margin-bottom: 0.35rem;
}

.page-about .timeline__body p {
  font-size: 0.92rem;
  line-height: 1.62;
  color: var(--steel);
}

/* ---------- 团队 ---------- */
.page-about .crew {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line-dark);
  border: 1px solid var(--line-dark);
}

.page-about .crew__item {
  background: var(--ink);
  padding: clamp(1.1rem, 3vw, 1.5rem);
  transition: background var(--t-fast) var(--ease);
}

.page-about .crew__item:hover {
  background: #16202b;
}

.page-about .crew__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.8rem, 5.5vw, 2.6rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--amber);
  margin-bottom: 0.6rem;
}

.page-about .crew__item h3 {
  font-size: 1.06rem;
  color: var(--paper);
  margin-bottom: 0.4rem;
}

.page-about .crew__item p {
  font-size: 0.9rem;
  line-height: 1.62;
  color: var(--mist);
}

/* ---------- 流水线 ---------- */
.page-about .pipeline-grid {
  display: grid;
  gap: clamp(1.25rem, 3.5vw, 2rem);
}

.page-about .pipeline-intro {
  font-size: clamp(0.94rem, 2.1vw, 1.02rem);
  line-height: 1.65;
  color: var(--steel);
  max-width: 56ch;
  border-left: 3px solid var(--pitch);
  padding-left: 0.9rem;
}

.page-about .pipeline {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line-light);
}

.page-about .pipeline__step details {
  border-bottom: 1px solid var(--line-light);
}

.page-about .pipeline__step summary {
  display: flex;
  align-items: baseline;
  gap: 0.85rem;
  padding: 0.95rem 2rem 0.95rem 0;
  cursor: pointer;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(1rem, 2.6vw, 1.15rem);
  letter-spacing: -0.01em;
  color: var(--navy);
  position: relative;
  list-style: none;
  transition: color var(--t-fast) var(--ease);
}

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

.page-about .pipeline__step summary::after {
  content: "+";
  position: absolute;
  right: 0.35rem;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  font-size: 1.1rem;
  color: var(--flame);
}

.page-about .pipeline__step details[open] summary::after {
  content: "–";
}

.page-about .pipeline__step summary:hover,
.page-about .pipeline__step details[open] summary {
  color: var(--flame);
}

.page-about .pipeline__idx {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--pitch);
}

.page-about .pipeline__step details p {
  padding: 0 0 1.1rem 2rem;
  font-size: 0.9rem;
  line-height: 1.62;
  color: var(--steel);
}

/* ---------- 覆盖 ---------- */
.page-about .coverage-grid {
  display: grid;
  gap: clamp(1.5rem, 4vw, 2.5rem);
}

.page-about .coverage-copy > p {
  font-size: clamp(0.94rem, 2.1vw, 1.02rem);
  line-height: 1.68;
  color: var(--mist);
  margin-bottom: clamp(1rem, 2.5vw, 1.5rem);
}

.page-about .league-legend {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.85rem;
}

.page-about .league-legend li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 0.75rem;
  align-items: baseline;
  font-size: 0.9rem;
  line-height: 1.6;
  color: var(--mist);
  padding-bottom: 0.85rem;
  border-bottom: 1px dashed rgba(216, 222, 227, 0.22);
}

.page-about .league-legend li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .league-legend .tag {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  padding: 0.22rem 0.5rem;
  white-space: nowrap;
  color: var(--ink);
}

.page-about .league-legend .tag--pitch {
  background: var(--pitch);
  color: var(--paper);
}

.page-about .league-legend .tag--amber {
  background: var(--amber);
}

.page-about .league-legend .tag--flame {
  background: var(--flame);
  color: var(--paper);
}

/* ---------- 合作 ---------- */
.page-about .partners {
  list-style: none;
  margin: 0 0 clamp(1.5rem, 4vw, 2.25rem);
  padding: 0;
  display: grid;
  gap: clamp(1rem, 2.5vw, 1.5rem);
}

.page-about .partners__item {
  padding-left: 1rem;
  border-left: 2px solid var(--pitch);
  transition: border-color var(--t-fast) var(--ease);
}

.page-about .partners__item:hover {
  border-left-color: var(--flame);
}

.page-about .partners__item h3 {
  font-size: clamp(1rem, 2.6vw, 1.1rem);
  line-height: 1.3;
  margin-bottom: 0.4rem;
}

.page-about .partners__item p {
  font-size: 0.92rem;
  line-height: 1.62;
  color: var(--steel);
}

.page-about .honor {
  display: grid;
  gap: 1rem;
  padding: clamp(1.1rem, 3vw, 1.6rem);
  background: var(--ember);
  border-left: 4px solid var(--amber);
}

.page-about .honor__text {
  font-size: 0.94rem;
  line-height: 1.65;
  color: var(--navy);
}

.page-about .honor .btn {
  justify-self: start;
}

/* ---------- 服务 ---------- */
.page-about .service-grid {
  display: grid;
  gap: clamp(1.5rem, 4vw, 2.5rem);
}

.page-about .service-copy > p {
  font-size: clamp(0.94rem, 2.1vw, 1.02rem);
  line-height: 1.68;
  color: var(--steel);
  margin-bottom: clamp(1rem, 2.5vw, 1.5rem);
}

.page-about .service-list {
  list-style: none;
  margin: 0 0 clamp(1.25rem, 3vw, 1.75rem);
  padding: 0;
  display: grid;
  gap: 0.9rem;
}

.page-about .service-list li {
  background: #fff;
  border: 1px solid var(--line-light);
  border-left: 3px solid var(--flame);
  padding: 0.85rem 1rem;
}

.page-about .service-list h3 {
  font-size: 0.98rem;
  margin-bottom: 0.25rem;
}

.page-about .service-list p {
  font-size: 0.88rem;
  line-height: 1.6;
  color: var(--steel);
}

.page-about .service-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

/* ---------- 按钮微调 ---------- */
.page-about .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.62rem 1.15rem;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 0.88rem;
  letter-spacing: 0.02em;
  text-decoration: none;
  border: 1px solid transparent;
  transition: background var(--t-fast) var(--ease), color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease), transform var(--t-fast) var(--ease);
}

.page-about .btn--pulse {
  background: var(--flame);
  border-color: var(--flame);
  color: var(--paper);
}

.page-about .btn--pulse:hover {
  background: #c9451f;
  border-color: #c9451f;
  transform: translateY(-2px);
}

.page-about .btn--line,
.page-about .btn--ghost {
  background: transparent;
  border-color: var(--navy);
  color: var(--navy);
}

.page-about .btn--ghost {
  border-color: var(--steel);
}

.page-about .btn--line:hover,
.page-about .btn--ghost:hover {
  background: var(--navy);
  border-color: var(--navy);
  color: var(--paper);
}

.page-about .chapter--dark .btn--line {
  border-color: var(--mist);
  color: var(--paper);
}

.page-about .chapter--dark .btn--line:hover {
  background: var(--flame);
  border-color: var(--flame);
}

/* ---------- 结尾 ---------- */
.page-about .about-cta {
  background: var(--ink);
  color: var(--paper);
  padding: clamp(2rem, 5vw, 3.25rem) 0;
  border-top: 2px solid var(--flame);
}

.page-about .about-cta__inner {
  display: grid;
  gap: clamp(1.25rem, 3.5vw, 2rem);
  align-items: end;
}

.page-about .about-cta h2 {
  font-size: clamp(1.35rem, 4vw, 2rem);
  line-height: 1.15;
  margin-bottom: 0.6rem;
}

.page-about .about-cta p {
  font-size: 0.94rem;
  line-height: 1.65;
  color: var(--mist);
  max-width: 50ch;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.page-about .about-cta .btn--line {
  border-color: var(--mist);
  color: var(--paper);
}

.page-about .about-cta .btn--line:hover {
  background: var(--flame);
  border-color: var(--flame);
  color: var(--paper);
}

/* ---------- 媒体查询 ---------- */
@media (min-width: 640px) {
  .page-about .crew {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

  .page-about .honor {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }

  .page-about .honor .btn {
    justify-self: end;
  }
}

@media (min-width: 900px) {
  .page-about .hero-grid {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(2rem, 4vw, 3.5rem);
  }

  .page-about .hero-rail {
    flex-direction: column;
    overflow: visible;
    padding: 0 0 0 1rem;
    border-left: 1px solid var(--line-dark);
    border-bottom: 0;
    gap: 0.55rem;
  }

  .page-about .rail-link {
    border: 0;
    padding: 0.1rem 0;
    position: relative;
  }

  .page-about .rail-link::before {
    content: "";
    position: absolute;
    left: -1rem;
    top: 50%;
    width: 0.5rem;
    height: 2px;
    background: var(--steel);
    transform: translateY(-50%);
    transition: background var(--t-fast) var(--ease), width var(--t-fast) var(--ease);
  }

  .page-about .rail-link:hover {
    background: transparent;
    color: var(--flame);
  }

  .page-about .rail-link:hover::before {
    background: var(--flame);
    width: 0.85rem;
  }

  .page-about .origin-grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    align-items: start;
  }

  .page-about .origin-grid .shot {
    position: sticky;
    top: 6rem;
  }

  .page-about .coverage-grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: start;
  }

  .page-about .service-grid {
    grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr);
    align-items: start;
  }

  .page-about .pipeline-grid {
    grid-template-columns: minmax(0, 0.42fr) minmax(0, 0.58fr);
    align-items: start;
    gap: clamp(2rem, 4vw, 3rem);
  }

  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1fr) auto;
  }

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

@media (min-width: 1180px) {
  .page-about .crew {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition-duration: 0.01ms !important;
    transform: none !important;
  }
}