.page-about {
  --about-gutter: clamp(20px, 4vw, 56px);
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
}

.page-about img {
  max-width: 100%;
  height: auto;
}

.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: clamp(24px, 4vw, 44px);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--c-text-dim);
}

.page-about .breadcrumb a {
  color: var(--c-text-soft);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

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

.page-about .breadcrumb__sep {
  color: rgba(200, 211, 224, 0.42);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(20px, 4vw, 34px) 0 clamp(42px, 6vw, 80px);
  color: var(--white);
  background:
    radial-gradient(110% 90% at 88% -12%, rgba(122, 108, 240, 0.26) 0%, rgba(11, 27, 51, 0) 62%),
    radial-gradient(80% 70% at 4% 110%, rgba(255, 107, 74, 0.16) 0%, rgba(11, 27, 51, 0) 60%),
    repeating-linear-gradient(90deg, rgba(200, 211, 224, 0.08) 0 1px, transparent 1px 92px),
    repeating-linear-gradient(0deg, rgba(200, 211, 224, 0.06) 0 1px, transparent 1px 92px),
    var(--ink);
  border-bottom: 1px solid rgba(200, 211, 224, 0.16);
}

.page-about .about-hero .eyebrow {
  color: var(--c-text-soft);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(28px, 4vw, 48px);
  align-items: center;
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(34px, 7.2vw, 74px);
  line-height: 1.04;
  letter-spacing: -0.02em;
  word-break: break-word;
}

.page-about .about-hero__lead {
  margin: clamp(18px, 2.6vw, 26px) 0 0;
  max-width: 46ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.82;
  color: var(--c-text-soft);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3vw, 32px);
}

.page-about .about-hero__figure {
  position: relative;
  margin: 0;
}

.page-about .about-hero__figure::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--grad);
  z-index: 2;
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  border: 1px solid rgba(200, 211, 224, 0.2);
  background: var(--ink-2);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 30px), calc(100% - 30px) 100%, 0 100%);
  object-fit: cover;
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  margin-top: clamp(32px, 5vw, 56px);
  border-top: 1px solid rgba(200, 211, 224, 0.18);
}

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

.page-about .stat__num {
  display: block;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(28px, 3.6vw, 40px);
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .stat__num em {
  font-style: normal;
  font-size: 0.4em;
  font-weight: 600;
  margin-left: 6px;
  color: var(--c-text-dim);
}

.page-about .stat__label {
  display: block;
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: 0.04em;
  color: var(--c-text-dim);
}

/* ---------- 服务坐标 ---------- */
.page-about .about-base {
  padding: clamp(48px, 7vw, 92px) 0;
}

.page-about .about-base__grid {
  display: grid;
  gap: clamp(28px, 4vw, 44px);
}

.page-about .h2 {
  margin: 12px 0 18px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(26px, 3.6vw, 42px);
  line-height: 1.16;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .prose {
  max-width: 36em;
}

.page-about .prose p {
  margin: 0 0 16px;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.86;
  color: var(--steel);
  color: #2c3d55;
}

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

.page-about .prose a {
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid var(--coral);
  padding-bottom: 1px;
  transition: color 0.2s var(--ease);
}

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

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

.page-about .note {
  position: relative;
  padding: 18px 20px 18px 24px;
  background: var(--white);
  border: 1px solid var(--mist);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 16px), calc(100% - 16px) 100%, 0 100%);
}

.page-about .note::before {
  content: "";
  position: absolute;
  left: 0;
  top: 14px;
  bottom: 14px;
  width: 3px;
  background: var(--grad);
}

.page-about .note__key {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--steel);
}

.page-about .note__text {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.72;
  color: #2c3d55;
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  padding: clamp(48px, 7vw, 92px) 0;
  background: var(--white);
  border-top: 1px solid var(--mist);
  border-bottom: 1px solid var(--mist);
}

.page-about .about-timeline__grid {
  display: grid;
  gap: clamp(28px, 4vw, 48px);
  align-items: start;
}

.page-about .timeline-rail__note {
  margin: 0 0 4px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--steel);
}

.page-about .tl-nav {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .tl-nav a {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 10px 12px;
  font-size: 14px;
  line-height: 1.5;
  color: var(--ink);
  text-decoration: none;
  border-left: 2px solid var(--mist);
  transition: border-color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-about .tl-nav a:hover,
.page-about .tl-nav a:focus-visible {
  border-left-color: var(--coral);
  background: var(--paper);
}

.page-about .tl-nav .mono {
  flex: 0 0 auto;
  min-width: 44px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--steel);
}

.page-about .timeline-figure {
  position: relative;
  margin: 0 0 clamp(26px, 4vw, 38px);
  border: 1px solid var(--mist);
  background: var(--paper);
}

.page-about .timeline-figure::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 96px;
  height: 3px;
  background: var(--grad);
}

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

.page-about .tl-item {
  position: relative;
  padding: 0 0 clamp(28px, 4vw, 42px) clamp(22px, 3vw, 34px);
  border-left: 1px solid var(--mist);
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: -6px;
  top: 8px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--white);
  border: 2px solid var(--steel);
}

.page-about .tl-item:nth-of-type(2)::before { border-color: var(--coral); }
.page-about .tl-item:nth-of-type(3)::before { border-color: var(--amber); }
.page-about .tl-item:nth-of-type(4)::before { border-color: var(--celadon); }
.page-about .tl-item:nth-of-type(5)::before { border-color: var(--violet); }

.page-about .tl-item:last-child {
  padding-bottom: 0;
  border-left-color: transparent;
}

.page-about .tl-item__year {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(20px, 2.8vw, 28px);
  letter-spacing: 0.02em;
  color: var(--ink);
}

.page-about .tl-item__title {
  margin: 8px 0 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(18px, 2.2vw, 22px);
  line-height: 1.4;
  color: var(--ink);
}

.page-about .tl-item__text {
  margin: 0;
  max-width: 40em;
  font-size: 15px;
  line-height: 1.82;
  color: #2c3d55;
}

/* ---------- 服务版图 ---------- */
.page-about .about-scope {
  position: relative;
  overflow: hidden;
  padding: clamp(48px, 7vw, 92px) 0;
  color: var(--white);
  background:
    radial-gradient(85% 70% at 96% 4%, rgba(31, 185, 142, 0.18) 0%, rgba(11, 27, 51, 0) 58%),
    radial-gradient(70% 60% at 0% 100%, rgba(255, 107, 74, 0.14) 0%, rgba(11, 27, 51, 0) 60%),
    var(--ink);
}

.page-about .about-scope .h2 {
  color: var(--white);
  margin-top: 12px;
}

.page-about .about-scope .eyebrow {
  color: var(--c-text-soft);
}

.page-about .about-scope__lead {
  max-width: 52em;
  margin: 0;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.84;
  color: var(--c-text-soft);
}

.page-about .cat-list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 24px 0 0;
  padding: 0;
}

.page-about .cat-list li {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 12px;
  font-size: 13px;
  color: var(--c-text-soft);
  border: 1px solid rgba(200, 211, 224, 0.24);
  transition: border-color 0.2s var(--ease), color 0.2s var(--ease);
}

.page-about .cat-list li:hover {
  border-color: rgba(31, 185, 142, 0.7);
  color: var(--white);
}

.page-about .cat-list .mono {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--amber);
}

.page-about .scene-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-top: clamp(26px, 4vw, 42px);
}

.page-about .scene {
  position: relative;
  padding: 20px 20px 22px;
  background: rgba(16, 42, 74, 0.74);
  border: 1px solid rgba(200, 211, 224, 0.18);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%);
  transition: border-color 0.2s var(--ease), background 0.2s var(--ease), transform 0.2s var(--ease);
}

.page-about .scene:hover,
.page-about .scene:focus-within {
  border-color: rgba(255, 107, 74, 0.62);
  background: rgba(16, 42, 74, 0.96);
  transform: translateY(-2px);
}

.page-about .scene__idx {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--celadon);
}

.page-about .scene__name {
  margin: 10px 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 19px;
  line-height: 1.35;
  color: var(--white);
}

.page-about .scene__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.76;
  color: var(--c-text-soft);
}

.page-about .scene__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 14px;
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  padding: clamp(48px, 7vw, 92px) 0;
  background: var(--paper);
}

.page-about .about-team__grid {
  display: grid;
  gap: clamp(26px, 4vw, 46px);
  align-items: center;
}

.page-about .about-team__figure {
  position: relative;
  margin: 0;
  border: 1px solid var(--mist);
  background: var(--white);
}

.page-about .about-team__figure::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: 72px;
  height: 3px;
  background: var(--grad);
  z-index: 2;
}

.page-about .about-team__figure img {
  display: block;
  width: 100%;
  object-fit: cover;
  clip-path: polygon(0 0, 100% 0, 100% 100%, 24px 100%, 0 calc(100% - 24px));
}

.page-about .team-lines {
  list-style: none;
  margin: clamp(20px, 3vw, 28px) 0 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .team-lines li {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 14px;
  padding: 16px 0;
  border-top: 1px solid var(--mist);
}

.page-about .team-lines__idx {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--coral);
  padding-top: 3px;
}

.page-about .team-lines__name {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  line-height: 1.4;
  color: var(--ink);
}

.page-about .team-lines__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: #2c3d55;
}

/* ---------- 长期维护 ---------- */
.page-about .about-rhythm {
  padding: clamp(48px, 7vw, 92px) 0;
  background: var(--white);
  border-top: 1px solid var(--mist);
}

.page-about .about-rhythm__grid {
  display: grid;
  gap: clamp(26px, 4vw, 44px);
}

.page-about .rhythm-panel {
  position: relative;
  padding: 24px 22px;
  background: var(--ink-2);
  color: var(--white);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 22px), calc(100% - 22px) 100%, 0 100%);
}

.page-about .rhythm-panel::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 58%;
  height: 2px;
  background: var(--grad);
}

.page-about .rhythm-row {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 6px 16px;
  padding: 14px 0;
  border-bottom: 1px solid rgba(200, 211, 224, 0.16);
}

.page-about .rhythm-row:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .rhythm-row__key {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--c-text-dim);
}

.page-about .rhythm-row__val {
  font-size: 14px;
  line-height: 1.6;
  color: var(--white);
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  position: relative;
  padding: clamp(36px, 5vw, 64px) 0;
  background: var(--ink);
  color: var(--white);
}

.page-about .about-cta::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--grad);
}

.page-about .about-cta__inner {
  display: grid;
  gap: 20px;
  align-items: center;
}

.page-about .about-cta__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(24px, 3.4vw, 36px);
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .about-cta__text {
  margin: 0;
  max-width: 46em;
  font-size: 15px;
  line-height: 1.8;
  color: var(--c-text-soft);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 600px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .stat {
    padding: 20px 22px 0;
    border-left: 1px solid rgba(200, 211, 224, 0.14);
  }

  .page-about .stat:first-child {
    padding-left: 0;
    border-left: 0;
  }

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

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, 0.98fr);
  }

  .page-about .about-base__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 336px);
    align-items: start;
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 0.92fr) minmax(0, 1.08fr);
  }

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

@media (min-width: 960px) {
  .page-about .about-timeline__grid {
    grid-template-columns: minmax(0, 300px) minmax(0, 1fr);
  }

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

@media (min-width: 1040px) {
  .page-about .scene-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 820px) {
  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1fr) auto;
  }

  .page-about .about-cta__actions {
    justify-content: flex-end;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .scene,
  .page-about .tl-nav a,
  .page-about .cat-list li,
  .page-about .breadcrumb a {
    transition: none;
  }

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