.page-about {
  --about-rail: 208px;
  --about-soft: #0E2C22;
  --about-text: #CFE3D8;
  color: var(--fog);
  padding-bottom: clamp(2.5rem, 6vw, 5rem);
}

.page-about .breadcrumb {
  padding-top: clamp(1rem, 2.5vw, 1.75rem);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding-top: clamp(1rem, 2.5vw, 2rem);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -220px;
  left: -160px;
  width: 560px;
  height: 560px;
  border-radius: 46% 54% 62% 38% / 52% 44% 56% 48%;
  background: radial-gradient(circle at 38% 38%, rgba(61, 245, 176, 0.22), transparent 68%);
  pointer-events: none;
  z-index: 0;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  top: -120px;
  right: -180px;
  width: 480px;
  height: 480px;
  border-radius: 58% 42% 36% 64% / 44% 58% 42% 56%;
  background: radial-gradient(circle at 55% 45%, rgba(255, 180, 84, 0.16), transparent 70%);
  pointer-events: none;
  z-index: 0;
}

.page-about .hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.5rem, 3.5vw, 2.5rem);
}

.page-about .hero-kicker {
  margin: 0 0 0.75rem;
  font-family: var(--font-serif);
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  color: var(--mint);
}

.page-about h1 {
  margin: 0 0 1rem;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.25rem, 7.2vw, 4.4rem);
  line-height: 1.02;
  letter-spacing: -0.02em;
  color: var(--fog);
}

.page-about .hero-lede {
  margin: 0;
  max-width: 52ch;
  font-size: clamp(1rem, 1.6vw, 1.0625rem);
  line-height: 1.85;
  color: var(--about-text);
}

.page-about .hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin-top: 1.5rem;
}

.page-about .hero-facts {
  list-style: none;
  margin: 0;
  padding: 0 0 0 clamp(0.9rem, 2vw, 1.25rem);
  display: grid;
  gap: 0.9rem;
  border-left: 2px solid var(--line);
}

.page-about .hero-fact {
  display: grid;
  gap: 0.15rem;
}

.page-about .fact-key {
  font-family: var(--font-serif);
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  color: var(--sage);
}

.page-about .fact-val {
  font-family: var(--font-mono);
  font-size: 1.35rem;
  font-weight: 600;
  line-height: 1.1;
  color: var(--amber);
  white-space: nowrap;
}

.page-about .hero-media {
  position: relative;
  z-index: 1;
  margin: clamp(1.6rem, 3.5vw, 2.6rem) 0 0;
  border-radius: var(--radius-l);
  overflow: hidden;
  border: 1px solid var(--line);
}

.page-about .hero-media img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

/* ---------- 主体：左轨 + 右侧叙事 ---------- */
.page-about .about-body {
  margin-top: clamp(2.5rem, 6vw, 4.5rem);
}

.page-about .about-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.5rem, 4vw, 3rem);
}

.page-about .rail-sticky {
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  background: var(--about-soft);
  padding: clamp(1rem, 2.4vw, 1.35rem);
}

.page-about .rail-label {
  margin: 0 0 0.85rem;
  font-family: var(--font-serif);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  color: var(--sage);
}

.page-about .rail-index {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.35rem;
}

.page-about .rail-link {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
  padding: 0.42rem 0.5rem;
  border-radius: var(--radius-s);
  font-size: 0.875rem;
  color: var(--fog);
  text-decoration: none;
  transition: background 160ms var(--ease), color 160ms var(--ease), transform 160ms var(--ease);
}

.page-about .rail-num {
  font-size: 0.75rem;
  color: var(--amber);
}

.page-about .rail-link:hover,
.page-about .rail-link:focus-visible {
  background: var(--ink-700);
  color: var(--mint-soft);
  transform: translateX(2px);
}

.page-about .rail-note {
  margin: 1rem 0 0;
  padding-top: 0.85rem;
  border-top: 1px dashed var(--line);
  font-size: 0.8125rem;
  line-height: 1.7;
  color: var(--sage);
}

.page-about .story-section {
  scroll-margin-top: 6rem;
  padding-bottom: clamp(1.75rem, 4vw, 3rem);
  margin-bottom: clamp(1.75rem, 4vw, 3rem);
  border-bottom: 1px solid var(--line);
}

.page-about .story-section:last-child {
  border-bottom: 0;
  margin-bottom: 0;
  padding-bottom: 0;
}

.page-about .story-section .section-head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: center;
  column-gap: 0.9rem;
  row-gap: 0.2rem;
  margin-bottom: 1.25rem;
}

.page-about .section-index {
  font-family: var(--font-mono);
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  font-weight: 600;
  line-height: 1;
  color: transparent;
  -webkit-text-stroke: 1px var(--mint);
  grid-row: span 2;
}

.page-about .section-title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.6rem, 4.4vw, 2.5rem);
  line-height: 1.1;
  letter-spacing: -0.015em;
  color: var(--fog);
}

.page-about .section-kicker {
  margin: 0;
  font-family: var(--font-serif);
  font-size: 0.8125rem;
  letter-spacing: 0.05em;
  color: var(--sage);
}

.page-about .story-prose {
  max-width: 64ch;
}

.page-about .story-prose p {
  margin: 0 0 1.05em;
  font-size: clamp(1rem, 1.35vw, 1.0625rem);
  line-height: 1.85;
  color: var(--about-text);
}

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

/* ---------- 方法三步 ---------- */
.page-about .method-steps {
  list-style: none;
  margin: 1.5rem 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.9rem;
}

.page-about .method-step {
  position: relative;
  padding: 1.1rem 1.1rem 1.2rem;
  border: 1px solid var(--line);
  border-left: 3px solid var(--mint);
  border-radius: var(--radius-s);
  background: var(--ink-800);
  transition: transform 180ms var(--ease), border-color 180ms var(--ease);
}

.page-about .method-step:hover {
  transform: translateY(-3px);
  border-color: var(--mint);
}

.page-about .method-code {
  display: block;
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  color: var(--amber);
}

.page-about .method-name {
  margin: 0.35rem 0 0.45rem;
  font-family: var(--font-display);
  font-size: 1.3rem;
  font-weight: 900;
  letter-spacing: -0.01em;
  color: var(--fog);
}

.page-about .method-step p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--about-text);
}

.page-about .method-media,
.page-about .version-media {
  margin: 1.6rem 0 1.5rem;
  border-radius: var(--radius-m);
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--ink-800);
}

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

.page-about .method-media img {
  aspect-ratio: 3 / 2;
}

.page-about .version-media img {
  aspect-ratio: 2 / 1;
}

.page-about .media-caption {
  padding: 0.7rem 0.95rem;
  font-size: 0.8125rem;
  color: var(--sage);
  border-top: 1px solid var(--line);
}

/* ---------- 团队色块 ---------- */
.page-about .team-grid {
  list-style: none;
  margin: 1.5rem 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.85rem;
}

.page-about .team-card {
  position: relative;
  padding: 1.15rem 1.15rem 1.25rem;
  border-radius: 22px 8px 26px 10px;
  background: linear-gradient(150deg, var(--ink-700), var(--ink-800) 72%);
  border: 1px solid var(--line);
  transition: transform 180ms var(--ease), border-color 180ms var(--ease), background 180ms var(--ease);
  outline: none;
}

.page-about .team-card:nth-child(2n) {
  border-radius: 8px 26px 10px 22px;
}

.page-about .team-card:nth-child(3n) {
  border-radius: 26px 12px 22px 8px;
}

.page-about .team-card:hover,
.page-about .team-card:focus-visible {
  transform: translateY(-4px);
  border-color: var(--mint);
  background: linear-gradient(150deg, #17412f, var(--ink-800) 76%);
}

.page-about .team-card:focus-visible {
  box-shadow: 0 0 0 2px var(--mint);
}

.page-about .team-count {
  display: inline-block;
  font-size: 1.6rem;
  font-weight: 600;
  line-height: 1;
  color: var(--amber);
}

.page-about .team-name {
  margin: 0.4rem 0 0.5rem;
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 900;
  color: var(--fog);
}

.page-about .team-duty {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--about-text);
}

/* ---------- 版本时间轴 ---------- */
.page-about .version-list {
  position: relative;
  list-style: none;
  margin: 1.6rem 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.85rem;
}

.page-about .version-node {
  position: relative;
  padding: 1rem 1rem 1.1rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-s);
  background: var(--about-soft);
  transition: transform 180ms var(--ease), border-color 180ms var(--ease);
  outline: none;
}

.page-about .version-node:hover,
.page-about .version-node:focus-visible {
  transform: translateY(-3px);
  border-color: var(--amber);
}

.page-about .version-node:focus-visible {
  box-shadow: 0 0 0 2px var(--mint);
}

.page-about .version-code {
  display: inline-block;
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--amber);
}

.page-about .version-title {
  margin: 0.3rem 0 0.45rem;
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 900;
  color: var(--fog);
}

.page-about .version-desc {
  margin: 0;
  font-size: 0.875rem;
  line-height: 1.7;
  color: var(--about-text);
}

/* ---------- 合作坐标表 ---------- */
.page-about .coord-list {
  list-style: none;
  margin: 1.4rem 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.6rem;
}

.page-about .coord-item {
  display: grid;
  gap: 0.2rem;
  padding: 0.75rem 0.85rem;
  border-left: 2px solid var(--amber-deep);
  background: rgba(18, 53, 42, 0.6);
}

.page-about .coord-key {
  font-size: 1.5rem;
  font-weight: 600;
  line-height: 1;
  color: var(--mint);
}

.page-about .coord-label {
  font-size: 0.8125rem;
  line-height: 1.55;
  color: var(--sage);
}

.page-about .honor-list {
  list-style: none;
  margin: 1.4rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.5rem;
}

.page-about .honor-item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: baseline;
  gap: 0.85rem;
  padding: 0.75rem 0 0.75rem;
  border-top: 1px dashed var(--line);
}

.page-about .honor-year {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--amber);
}

.page-about .honor-text {
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--fog);
}

/* ---------- 服务与收尾 ---------- */
.page-about .service-actions,
.page-about .outro-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin-top: 1.4rem;
}

.page-about .about-outro {
  margin-top: clamp(2rem, 5vw, 3.5rem);
}

.page-about .outro-card {
  position: relative;
  overflow: hidden;
  padding: clamp(1.5rem, 4vw, 2.75rem);
  border-radius: var(--radius-l);
  background: linear-gradient(140deg, #0f3a2b, var(--ink-800) 62%);
  border: 1px solid var(--line);
}

.page-about .outro-card::after {
  content: "";
  position: absolute;
  right: -90px;
  bottom: -120px;
  width: 320px;
  height: 320px;
  border-radius: 52% 48% 40% 60% / 46% 54% 46% 54%;
  background: radial-gradient(circle at 45% 45%, rgba(61, 245, 176, 0.2), transparent 70%);
  pointer-events: none;
}

.page-about .outro-title {
  position: relative;
  margin: 0 0 0.75rem;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.5rem, 4vw, 2.25rem);
  line-height: 1.1;
  letter-spacing: -0.015em;
  color: var(--fog);
}

.page-about .outro-text {
  position: relative;
  margin: 0;
  max-width: 56ch;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--about-text);
}

.page-about .outro-actions {
  position: relative;
}

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-about .method-steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

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

@media (min-width: 900px) {
  .page-about .hero-grid {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
    align-items: end;
  }

  .page-about .hero-facts {
    gap: 1.1rem;
  }
}

@media (min-width: 960px) {
  .page-about .about-layout {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .story-rail {
    position: sticky;
    top: 5.5rem;
  }

  .page-about .rail-index {
    grid-template-columns: 1fr;
  }

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

  .page-about .version-list {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0.75rem;
    padding-top: 2.4rem;
  }

  .page-about .version-list::before {
    content: "";
    position: absolute;
    top: 0.85rem;
    left: 0.3rem;
    right: 0.3rem;
    height: 2px;
    background: linear-gradient(90deg, var(--mint), var(--amber));
    opacity: 0.45;
  }

  .page-about .version-node::before {
    content: "";
    position: absolute;
    top: -1.55rem;
    left: 0.1rem;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--ink-900);
    border: 2px solid var(--mint);
  }

  .page-about .version-node:hover::before,
  .page-about .version-node:focus-visible::before {
    background: var(--amber);
    border-color: var(--amber);
  }
}

@media (min-width: 1120px) {
  .page-about .story-section .section-head {
    column-gap: 1.25rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .rail-link,
  .page-about .method-step,
  .page-about .team-card,
  .page-about .version-node {
    transition: none;
  }

  .page-about .rail-link:hover,
  .page-about .rail-link:focus-visible,
  .page-about .method-step:hover,
  .page-about .team-card:hover,
  .page-about .team-card:focus-visible,
  .page-about .version-node:hover,
  .page-about .version-node:focus-visible {
    transform: none;
  }
}