.page-about {
  --about-rail-w: 232px;
  --about-hair: rgba(42, 51, 80, 0.26);
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-display);
}

/* ---------- 面包屑 ---------- */

.page-about .about-crumbs {
  background: var(--paper);
  border-bottom: 1px solid var(--about-hair);
  padding: 14px 0;
}

.page-about .breadcrumb ol {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 0;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.06em;
}

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

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

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

.page-about .breadcrumb [aria-current="page"] {
  color: var(--ink);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  background: var(--deep);
  color: var(--paper);
  padding: 52px 0 60px;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 84% 12%, rgba(255, 122, 26, 0.42), transparent 46%),
    radial-gradient(circle at 96% 2%, rgba(255, 179, 0, 0.26), transparent 34%),
    radial-gradient(circle at 6% 100%, rgba(0, 229, 208, 0.12), transparent 40%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  top: -34%;
  right: -18%;
  width: min(680px, 86vw);
  aspect-ratio: 1 / 1;
  background: repeating-conic-gradient(from 0deg, rgba(255, 179, 0, 0.15) 0 2deg, transparent 2deg 9deg);
  border-radius: 50%;
  -webkit-mask-image: radial-gradient(circle, #000 18%, transparent 70%);
  mask-image: radial-gradient(circle, #000 18%, transparent 70%);
  pointer-events: none;
}

.page-about .about-hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr;
  gap: 34px;
  align-items: end;
}

.page-about .about-hero .eyebrow {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--gold);
  margin: 0;
}

.page-about .about-hero h1 {
  margin: 16px 0 0;
  font-size: clamp(2rem, 6.4vw, 3.5rem);
  line-height: 1.05;
  letter-spacing: -0.035em;
  font-weight: 900;
  color: #fff;
  max-width: 18ch;
}

.page-about .about-hero .lead {
  margin: 20px 0 0;
  max-width: 52ch;
  font-size: 1rem;
  line-height: 1.78;
  color: var(--mist);
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-about .about-hero-actions .btn {
  white-space: nowrap;
}

.page-about .about-hero-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  background: var(--grid);
  border: 1px solid var(--grid);
}

.page-about .about-stat {
  background: rgba(11, 18, 48, 0.9);
  padding: 16px 18px;
}

.page-about .about-stat dt {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  color: var(--dim);
}

.page-about .about-stat dd {
  margin: 10px 0 0;
  font-size: 1.5rem;
  font-weight: 900;
  letter-spacing: -0.02em;
  color: var(--sun);
  line-height: 1.1;
}

/* ---------- 色带 ---------- */

.page-about .about-band {
  height: 6px;
  background: linear-gradient(90deg, var(--crimson), var(--sun) 44%, var(--gold) 66%, var(--cyan));
}

/* ---------- 主体画布 ---------- */

.page-about .about-body {
  padding: 0 0 72px;
  background: var(--paper);
}

.page-about .rail-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  padding-top: 40px;
}

/* 左栏 */

.page-about .about-rail {
  border-top: 3px solid var(--crimson);
  padding-top: 16px;
}

.page-about .about-rail-id {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  color: var(--dim);
}

.page-about .about-rail-list {
  list-style: none;
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 6px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-rail-list li {
  flex: 0 0 auto;
}

.page-about .about-rail-list a {
  display: flex;
  align-items: baseline;
  gap: 7px;
  padding: 8px 12px;
  border: 1px solid var(--about-hair);
  text-decoration: none;
  color: var(--ink);
  font-size: 0.86rem;
  white-space: nowrap;
  transition: border-color 0.18s ease, color 0.18s ease, background-color 0.18s ease;
}

.page-about .about-rail-list a:hover,
.page-about .about-rail-list a:focus-visible {
  border-color: var(--sun);
  color: var(--sun);
  background: rgba(255, 122, 26, 0.06);
}

.page-about .about-rail-list .cn {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--gold);
}

.page-about .about-rail-year {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--dim);
}

.page-about .about-rail-cta {
  margin-top: 18px;
  display: none;
}

/* ---------- 章节 ---------- */

.page-about .about-flow {
  min-width: 0;
}

.page-about .about-chapter {
  padding: 38px 0 46px;
  border-top: 1px solid var(--about-hair);
  scroll-margin-top: 88px;
}

.page-about .about-chapter:first-child {
  border-top: 0;
  padding-top: 4px;
}

.page-about .about-chapter-head {
  margin-bottom: 20px;
}

.page-about .about-chapter-num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.22em;
  color: var(--sun);
}

.page-about .about-chapter-title {
  margin: 8px 0 0;
  font-size: clamp(1.42rem, 3.6vw, 2.1rem);
  line-height: 1.16;
  letter-spacing: -0.025em;
  font-weight: 900;
  color: var(--ink);
}

.page-about .about-chapter-body p {
  margin: 0 0 16px;
  font-size: 1rem;
  line-height: 1.78;
  color: var(--ink);
}

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

.page-about .about-chapter-lead {
  margin: 0 0 22px;
  font-size: 1rem;
  line-height: 1.75;
}

.page-about .about-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: 26px;
}

/* ---------- 图片 ---------- */

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

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

.page-about .about-figure--edge img {
  clip-path: polygon(0 0, 100% 0, 100% 90%, 0 100%);
}

.page-about .about-figure figcaption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  color: var(--dim);
}

.page-about .about-figure--wide {
  margin-top: 30px;
  max-width: 720px;
}

.page-about .about-figure--band {
  margin-top: 28px;
}

/* ---------- 深色面板 ---------- */

.page-about .about-dark {
  position: relative;
  background: var(--ink);
  color: var(--paper);
  padding: 34px 22px 36px;
  overflow: hidden;
}

.page-about .about-dark::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(255, 122, 26, 0.07) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255, 122, 26, 0.07) 1px, transparent 1px);
  background-size: 64px 64px;
  pointer-events: none;
}

.page-about .about-dark--deep {
  background: var(--deep);
}

.page-about .about-dark > * {
  position: relative;
  z-index: 1;
}

.page-about .about-dark .about-chapter-title {
  color: #fff;
}

.page-about .about-dark .about-chapter-body p,
.page-about .about-dark .about-chapter-lead {
  color: var(--mist);
}

/* ---------- 团队拼贴 ---------- */

.page-about .crew-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin-top: 26px;
  background: var(--grid);
}

.page-about .crew-item {
  background: var(--deep-2);
  border-top: 2px solid var(--sun);
  padding: 20px 18px 22px;
  transition: background-color 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}

.page-about .crew-item:hover {
  background: var(--deep);
  border-top-color: var(--cyan);
  transform: translateY(-3px);
}

.page-about .crew-item h3 {
  margin: 0;
  font-size: 1.04rem;
  font-weight: 900;
  letter-spacing: -0.01em;
  color: #fff;
}

.page-about .crew-item .crew-count {
  display: block;
  margin-top: 5px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  color: var(--gold);
}

.page-about .crew-item p {
  margin: 12px 0 0;
  font-size: 0.9rem;
  line-height: 1.72;
  color: var(--mist);
}

/* ---------- 时间线 ---------- */

.page-about .about-timeline {
  position: relative;
  list-style: none;
  margin: 26px 0 0;
  padding: 0 0 0 40px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 8px;
  bottom: 12px;
  width: 2px;
  background: linear-gradient(180deg, var(--gold), var(--sun) 46%, var(--crimson));
}

.page-about .about-tl {
  position: relative;
  padding-bottom: 26px;
}

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

.page-about .about-tl::before {
  content: "";
  position: absolute;
  left: -40px;
  top: 6px;
  width: 16px;
  height: 16px;
  background: var(--deep);
  border: 2px solid var(--cyan);
  transform: rotate(45deg);
}

.page-about .about-tl-year {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.92rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--gold);
}

.page-about .about-tl h3 {
  margin: 7px 0 0;
  font-size: 1.06rem;
  font-weight: 900;
  letter-spacing: -0.01em;
  color: #fff;
}

.page-about .about-tl p {
  margin: 8px 0 0;
  font-size: 0.92rem;
  line-height: 1.72;
  color: var(--mist);
}

/* ---------- 服务地区 ---------- */

.page-about .about-region {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .about-region-card {
  position: relative;
  border: 1px solid var(--about-hair);
  border-left: 4px solid var(--sun);
  padding: 20px 20px 22px;
  background: rgba(255, 122, 26, 0.05);
}

.page-about .about-region-card--mono {
  border-left-color: var(--cyan);
  background: rgba(0, 229, 208, 0.06);
}

.page-about .about-region-label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  color: var(--dim);
}

.page-about .about-region-value {
  margin: 10px 0 0;
  font-size: 1.9rem;
  font-weight: 900;
  letter-spacing: -0.03em;
  line-height: 1.1;
  color: var(--ink);
}

.page-about .about-region-value--mono {
  font-family: var(--font-mono);
  font-size: 1.12rem;
  letter-spacing: 0.02em;
  color: var(--crimson);
  word-break: break-all;
}

.page-about .about-region-note {
  margin: 12px 0 0;
  font-size: 0.88rem;
  line-height: 1.7;
  color: #3a3f52;
}

.page-about .about-region-tail {
  margin: 22px 0 18px;
  font-size: 0.98rem;
  line-height: 1.75;
}

/* ---------- 合作生态 ---------- */

.page-about .about-eco-list {
  list-style: none;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin: 0;
  padding: 0;
  background: var(--grid);
}

.page-about .about-eco-item {
  background: var(--deep-2);
  padding: 20px 18px 22px;
  border-left: 2px solid transparent;
  transition: border-color 0.2s ease, background-color 0.2s ease;
}

.page-about .about-eco-item:hover {
  background: var(--deep);
  border-left-color: var(--cyan);
}

.page-about .about-eco-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.1em;
  color: var(--deep);
  background: var(--gold);
  padding: 4px 10px;
}

.page-about .about-eco-item p {
  margin: 12px 0 0;
  font-size: 0.92rem;
  line-height: 1.72;
  color: var(--mist);
}

.page-about .about-eco-note {
  margin: 24px 0 0;
  font-size: 0.94rem;
  line-height: 1.75;
  color: var(--mist);
  border-left: 2px solid var(--crimson);
  padding-left: 14px;
}

/* ---------- 收尾 ---------- */

.page-about .about-cta {
  margin-top: 8px;
  padding: 34px 24px 36px;
  background: var(--deep);
  color: var(--paper);
  position: relative;
  overflow: hidden;
}

.page-about .about-cta::after {
  content: "";
  position: absolute;
  right: -60px;
  bottom: -90px;
  width: 260px;
  height: 260px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 122, 26, 0.34), transparent 68%);
  pointer-events: none;
}

.page-about .about-cta-text {
  position: relative;
  z-index: 1;
  margin: 0 0 20px;
  max-width: 46ch;
  font-size: 1.04rem;
  line-height: 1.75;
  color: var(--paper);
}

.page-about .about-cta-actions {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 平板与桌面 ---------- */

@media (min-width: 720px) {
  .page-about .crew-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .page-about .about-region {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .about-dark {
    padding: 44px 40px 48px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    padding: 68px 0 76px;
  }

  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 0.8fr);
    gap: 52px;
  }

  .page-about .rail-layout {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: 56px;
    padding-top: 56px;
  }

  .page-about .about-rail {
    position: sticky;
    top: 96px;
  }

  .page-about .about-rail-list {
    display: grid;
    grid-template-columns: 1fr;
    gap: 0;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-rail-list li {
    flex: initial;
  }

  .page-about .about-rail-list a {
    border: 0;
    border-bottom: 1px solid var(--about-hair);
    padding: 11px 4px 11px 0;
    justify-content: flex-start;
    gap: 10px;
  }

  .page-about .about-rail-list .about-rail-label {
    flex: 1 1 auto;
  }

  .page-about .about-rail-cta {
    display: inline-flex;
    width: 100%;
    justify-content: center;
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: 40px;
    align-items: start;
  }

  .page-about .about-chapter {
    padding: 52px 0 60px;
  }

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

  .page-about .about-dark {
    padding: 52px 52px 56px;
  }

  .page-about .about-cta {
    padding: 46px 48px 50px;
  }
}

@media (min-width: 1120px) {
  .page-about .crew-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .crew-item,
  .page-about .about-eco-item,
  .page-about .about-rail-list a {
    transition: none;
  }
}