.page-about {
  background: var(--ink-900);
  color: var(--paper);
  overflow-x: hidden;
}

.page-about .breadcrumb {
  margin: 22px 0 0;
  font-size: 13px;
}

.page-about .breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  color: var(--mist);
}

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

.page-about .breadcrumb a {
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

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

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: 28px 0 44px;
  border-bottom: 1px solid var(--line-faint);
  background:
    radial-gradient(1100px 460px at 78% 0%, rgba(53, 242, 223, 0.08), transparent 68%),
    radial-gradient(720px 420px at 4% 92%, rgba(255, 122, 26, 0.07), transparent 70%),
    var(--ink-900);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, var(--line-faint) 1px, transparent 1px),
    linear-gradient(to bottom, var(--line-faint) 1px, transparent 1px);
  background-size: 96px 96px;
  opacity: 0.34;
  -webkit-mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.9), transparent 88%);
  mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.9), transparent 88%);
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 30px;
  min-width: 0;
}

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

.page-about .about-hero .eyebrow {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--cyan);
  text-transform: uppercase;
}

.page-about .about-hero h1 {
  margin: 0;
  font-size: clamp(28px, 5.4vw, 54px);
  line-height: 1.12;
  font-weight: 800;
  letter-spacing: -0.02em;
  max-width: 20ch;
}

.page-about .about-hero .lead {
  margin: 18px 0 0;
  max-width: 52ch;
  color: var(--mist);
  font-size: 16px;
  line-height: 1.8;
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: 28px;
  border: 1px solid var(--line-faint);
  background: var(--line-faint);
}

.page-about .about-stat {
  background: rgba(11, 32, 56, 0.72);
  padding: 14px 14px 16px;
  display: grid;
  gap: 4px;
}

.page-about .about-stat__num {
  font-size: 22px;
  line-height: 1.1;
  color: var(--cyan);
  letter-spacing: -0.01em;
}

.page-about .about-stat__label {
  font-size: 12px;
  line-height: 1.6;
  color: var(--mist);
}

.page-about .about-hero__media {
  margin: 0;
  min-width: 0;
}

.page-about .media-frame img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  background: var(--ink-800);
}

.page-about .media-frame__caption {
  margin: 10px 0 0;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--mist);
  border-left: 1px solid var(--line-blue);
  padding-left: 10px;
}

/* ---------- 双栏档案布局 ---------- */
.page-about .about-layout {
  display: grid;
  gap: 34px;
  padding: 34px 0 72px;
  min-width: 0;
}

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

.page-about .rail-title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--mist);
  padding-bottom: 6px;
  border-bottom: 1px solid var(--line-faint);
}

.page-about .rail-years,
.page-about .rail-nav {
  list-style: none;
  margin: 0 0 22px;
  padding: 0;
}

.page-about .rail-years {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 6px;
  scrollbar-width: thin;
}

.page-about .rail-years::-webkit-scrollbar {
  height: 4px;
}

.page-about .rail-years::-webkit-scrollbar-thumb {
  background: var(--line-soft);
}

.page-about .rail-years a,
.page-about .rail-nav a {
  display: flex;
  align-items: baseline;
  gap: 8px;
  color: var(--mist);
  text-decoration: none;
  font-size: 13px;
  line-height: 1.5;
  white-space: nowrap;
  border-bottom: 1px solid transparent;
}

.page-about .rail-years a {
  padding: 7px 10px;
  border: 1px solid var(--line-faint);
  border-radius: var(--radius);
  background: rgba(18, 48, 79, 0.4);
}

.page-about .rail-years a .mono {
  color: var(--cyan);
  font-size: 12px;
}

.page-about .rail-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 16px;
}

.page-about .rail-nav a {
  padding: 4px 0;
  border-left: 2px solid transparent;
  padding-left: 8px;
}

.page-about .rail-years a:hover,
.page-about .rail-years a:focus-visible,
.page-about .rail-nav a:hover,
.page-about .rail-nav a:focus-visible {
  color: var(--paper);
  border-color: var(--cyan);
  background: var(--cyan-soft);
}

.page-about .rail-years a:focus-visible,
.page-about .rail-nav a:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

/* ---------- 内容画布 ---------- */
.page-about .about-canvas {
  min-width: 0;
}

.page-about .about-block {
  padding-bottom: 34px;
  margin-bottom: 34px;
  border-bottom: 1px solid var(--line-faint);
  scroll-margin-top: calc(var(--header-h) + 20px);
}

.page-about .about-block--last {
  border-bottom: 0;
  margin-bottom: 0;
  padding-bottom: 0;
}

.page-about .about-block .eyebrow {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--orange);
  text-transform: uppercase;
}

.page-about .about-block .section-title {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(22px, 3.6vw, 34px);
  line-height: 1.32;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-block .lead {
  margin: 14px 0 0;
  max-width: 62ch;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-copy {
  margin: 16px 0 0;
  max-width: 66ch;
  font-size: 15.5px;
  line-height: 1.9;
  color: var(--mist);
}

.page-about .about-copy a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 242, 223, 0.45);
}

.page-about .about-copy a:hover,
.page-about .about-copy a:focus-visible {
  color: var(--paper);
  border-bottom-color: var(--paper);
}

.page-about .about-copy--tail {
  margin-top: 26px;
  padding-top: 16px;
  border-top: 1px dashed var(--line-soft);
}

.page-about .about-figure {
  margin: 24px 0 0;
}

.page-about .about-figure--wide {
  margin-top: 26px;
}

/* ---------- 时间轴 ---------- */
.page-about .timeline {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  position: relative;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  bottom: 4px;
  width: 1px;
  background: linear-gradient(to bottom, var(--cyan), rgba(42, 78, 107, 0.35));
}

.page-about .timeline__item {
  position: relative;
  padding: 0 0 26px 24px;
}

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

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 7px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  transform: translateX(-50%);
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(53, 242, 223, 0.12);
}

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

.page-about .timeline__title {
  margin: 6px 0 0;
  font-size: 18px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--paper);
}

.page-about .timeline__text {
  margin: 8px 0 0;
  max-width: 58ch;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--mist);
}

/* ---------- 模块矩阵 ---------- */
.page-about .module-grid {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line-faint);
  border: 1px solid var(--line-faint);
}

.page-about .module-grid > li {
  background: var(--ink-900);
  min-width: 0;
}

.page-about .module {
  display: block;
  height: 100%;
  padding: 18px 16px 20px;
  color: inherit;
  text-decoration: none;
  transition: background 0.16s var(--ease), transform 0.16s var(--ease);
}

.page-about .module__idx {
  display: block;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--cyan);
}

.page-about .module__title {
  margin: 10px 0 6px;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--paper);
  transition: color 0.16s var(--ease);
}

.page-about .module__text {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .module:hover,
.page-about .module:focus-visible {
  background: var(--ink-800);
  transform: translateY(-2px);
}

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

.page-about .module:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: -2px;
}

/* ---------- 团队与节奏 ---------- */
.page-about .role-list {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .role {
  padding: 14px 16px;
  border-left: 2px solid var(--line-blue);
  background: linear-gradient(90deg, rgba(53, 242, 223, 0.07), transparent 72%);
  transition: border-color 0.16s var(--ease);
}

.page-about .role:hover {
  border-left-color: var(--cyan);
}

.page-about .role__name {
  margin: 0;
  font-size: 12.5px;
  letter-spacing: 0.1em;
  color: var(--cyan);
}

.page-about .role__text {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .cadence {
  list-style: none;
  margin: 24px 0 0;
  padding: 18px 0 0;
  border-top: 1px dashed var(--line-soft);
  display: grid;
  gap: 16px;
}

.page-about .cadence__num {
  margin: 0;
  font-size: 19px;
  line-height: 1.2;
  color: var(--amber);
  letter-spacing: -0.01em;
}

.page-about .cadence__label {
  margin: 6px 0 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- 阅读体验要点 ---------- */
.page-about .note-list {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line-faint);
  border-top: 1px solid var(--line-faint);
  border-bottom: 1px solid var(--line-faint);
}

.page-about .note {
  display: flex;
  gap: 12px;
  align-items: baseline;
  padding: 12px 4px;
  background: var(--ink-900);
  font-size: 14px;
  line-height: 1.75;
  color: var(--paper);
}

.page-about .note__idx {
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--cyan);
  flex: 0 0 auto;
}

/* ---------- 服务 ---------- */
.page-about .service-grid {
  margin-top: 24px;
  display: grid;
  gap: 26px;
  min-width: 0;
}

.page-about .contact-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line-faint);
  border: 1px solid var(--line-faint);
}

.page-about .contact-list li {
  background: rgba(18, 48, 79, 0.42);
  padding: 13px 14px;
  display: grid;
  gap: 5px;
  min-width: 0;
}

.page-about .contact-key {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--mist);
}

.page-about .contact-val {
  font-size: 15px;
  line-height: 1.6;
  color: var(--paper);
  overflow-wrap: anywhere;
}

.page-about .contact-val a {
  color: var(--paper);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 242, 223, 0.5);
}

.page-about .contact-val a:hover,
.page-about .contact-val a:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

.page-about .service-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-top: 16px;
}

.page-about .copy-btn {
  appearance: none;
  cursor: pointer;
  padding: 8px 14px;
  font-family: var(--font-sans);
  font-size: 13.5px;
  color: var(--cyan);
  background: var(--cyan-soft);
  border: 1px solid rgba(53, 242, 223, 0.5);
  border-radius: var(--radius);
  transition: background 0.16s var(--ease), color 0.16s var(--ease);
}

.page-about .copy-btn:hover,
.page-about .copy-btn:focus-visible {
  background: rgba(53, 242, 223, 0.22);
  color: var(--paper);
}

.page-about .copy-btn:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

.page-about .copy-status {
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--cyan);
}

.page-about .btn {
  text-decoration: none;
}

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-about .about-hero {
    padding: 36px 0 52px;
  }

  .page-about .about-hero .lead {
    font-size: 17px;
  }

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

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

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

  .page-about .cadence {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }

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

  .page-about .note {
    padding: 12px 14px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: start;
    gap: 44px;
  }

  .page-about .about-layout {
    grid-template-columns: 216px minmax(0, 1fr);
    gap: 52px;
    padding: 48px 0 90px;
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--header-h) + 28px);
    align-self: start;
  }

  .page-about .rail-years {
    flex-direction: column;
    overflow: visible;
    gap: 6px;
  }

  .page-about .rail-years a {
    white-space: normal;
  }

  .page-about .rail-nav {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 2px;
  }

  .page-about .about-block {
    padding-bottom: 44px;
    margin-bottom: 44px;
  }

  .page-about .timeline__item {
    padding-left: 30px;
    padding-bottom: 30px;
  }

  .page-about .service-grid {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
    gap: 34px;
    align-items: start;
  }
}

@media (min-width: 1180px) {
  .page-about .module-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-hero h1 {
    max-width: 22ch;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .module,
  .page-about .role,
  .page-about .copy-btn,
  .page-about .module__title {
    transition: none;
  }

  .page-about .module:hover,
  .page-about .module:focus-visible {
    transform: none;
  }
}