.page-about {
  --about-measure: 42rem;
  --about-glow: rgba(59, 242, 196, 0.16);
  background: var(--ink);
  color: var(--paper);
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(20px, 4vw, 36px) 0 clamp(38px, 7vw, 72px);
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(120% 88% at 88% 0%, var(--about-glow) 0%, rgba(5, 16, 13, 0) 60%),
    linear-gradient(180deg, var(--ink-deep) 0%, var(--ink) 100%);
}

.page-about .about-hero .eyebrow {
  margin-top: clamp(22px, 4vw, 40px);
}

.page-about h1 {
  margin: clamp(12px, 2vw, 18px) 0 0;
  font-size: clamp(32px, 7.2vw, 72px);
  font-weight: 300;
  line-height: 1.1;
  letter-spacing: 0.03em;
  max-width: 16ch;
  color: var(--paper);
}

.page-about .about-lede {
  margin: clamp(18px, 3vw, 26px) 0 0;
  max-width: 36em;
  font-size: clamp(15.5px, 2.1vw, 18px);
  line-height: 1.85;
  color: rgba(241, 236, 222, 0.82);
}

.page-about .about-facts {
  list-style: none;
  margin: clamp(28px, 5vw, 46px) 0 0;
  padding: 0;
  display: grid;
  gap: 14px 28px;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  max-width: 46rem;
}

.page-about .about-facts li {
  display: flex;
  align-items: baseline;
  gap: 9px;
  padding-top: 12px;
  border-top: 1px solid var(--line);
}

.page-about .fact-num {
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
  font-size: clamp(24px, 3.4vw, 30px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--neon);
}

.page-about .fact-label {
  font-size: 13px;
  line-height: 1.5;
  letter-spacing: 0.03em;
  color: var(--mist);
}

/* ---------- 主体栅格 ---------- */
.page-about .about-body {
  padding: clamp(34px, 6vw, 64px) 0 clamp(48px, 8vw, 96px);
}

.page-about .about-layout {
  display: grid;
  gap: clamp(26px, 5vw, 48px);
}

/* ---------- 章节索引 ---------- */
.page-about .about-index {
  display: none;
}

@media (min-width: 960px) {
  .page-about .about-layout {
    grid-template-columns: 176px minmax(0, 1fr);
    gap: clamp(40px, 6vw, 88px);
  }

  .page-about .about-index {
    display: block;
    position: sticky;
    top: 96px;
    align-self: start;
  }
}

.page-about .index-title {
  margin: 0 0 14px;
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--neon);
}

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

.page-about .index-list a {
  display: grid;
  grid-template-columns: 26px minmax(0, 1fr);
  gap: 6px;
  align-items: baseline;
  padding: 9px 0;
  border-top: 1px solid var(--line);
  font-size: 13.5px;
  color: var(--mist);
  text-decoration: none;
  transition: color 0.2s var(--ease);
}

.page-about .index-list a:hover,
.page-about .index-list a:focus-visible {
  color: var(--neon-soft);
}

.page-about .index-num {
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
  font-size: 11.5px;
  color: var(--neon);
  opacity: 0.85;
}

.page-about .index-note {
  margin: 18px 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--line);
  font-size: 12px;
  line-height: 1.7;
  color: rgba(137, 175, 163, 0.85);
}

/* ---------- 章节块 ---------- */
.page-about .chapter-block {
  position: relative;
  padding-bottom: clamp(38px, 6vw, 68px);
  margin-bottom: clamp(38px, 6vw, 68px);
  border-bottom: 1px solid var(--line);
}

.page-about .chapter-block:last-of-type {
  border-bottom: 0;
  margin-bottom: 0;
  padding-bottom: clamp(24px, 4vw, 36px);
}

.page-about .ch-head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: clamp(12px, 2vw, 22px);
  align-items: start;
  margin-bottom: clamp(20px, 3vw, 30px);
}

.page-about .ch-num {
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
  font-size: clamp(38px, 6vw, 64px);
  font-weight: 700;
  line-height: 0.8;
  letter-spacing: -0.02em;
  color: transparent;
  -webkit-text-stroke: 1px var(--neon);
  padding-top: 6px;
}

@supports not ((-webkit-text-stroke: 1px #000) or (text-stroke: 1px #000)) {
  .page-about .ch-num {
    color: rgba(59, 242, 196, 0.35);
  }
}

.page-about .ch-title {
  margin: 0;
  font-size: clamp(21px, 3.4vw, 36px);
  font-weight: 700;
  line-height: 1.24;
  letter-spacing: -0.01em;
  color: var(--paper);
}

/* ---------- 正文 ---------- */
.page-about .about-copy {
  max-width: var(--about-measure);
}

.page-about .about-copy p {
  margin: 0 0 1.15em;
  font-size: 16.5px;
  line-height: 1.85;
  color: rgba(241, 236, 222, 0.85);
}

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

.page-about .about-copy a {
  color: var(--neon);
  text-decoration: none;
  border-bottom: 1px solid rgba(59, 242, 196, 0.4);
  transition: border-color 0.2s var(--ease);
}

.page-about .about-copy a:hover {
  border-bottom-color: var(--neon);
}

.page-about .pull-quote {
  margin: clamp(22px, 4vw, 32px) 0 0;
  padding-left: clamp(14px, 2.5vw, 22px);
  border-left: 2px solid var(--neon);
  font-size: clamp(16.5px, 2.4vw, 21px);
  line-height: 1.65;
  color: var(--paper);
}

/* ---------- 图片容器 ---------- */
.page-about .about-media {
  position: relative;
  margin: clamp(20px, 3.5vw, 30px) 0;
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--panel);
}

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

.page-about .about-media::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(158deg, rgba(5, 16, 13, 0) 42%, rgba(5, 16, 13, 0.78) 100%);
}

.page-about .about-media--wide {
  aspect-ratio: 1200 / 600;
}

.page-about .about-media--band {
  aspect-ratio: 960 / 640;
  margin-top: 0;
}

.page-about .about-media--tall {
  aspect-ratio: 1000 / 1200;
  margin: 0;
}

/* ---------- 时间轴 ---------- */
.page-about .tl-wrap {
  margin-top: clamp(20px, 3.5vw, 30px);
}

.page-about .tl-track {
  list-style: none;
  margin: 0;
  padding: 0 0 12px;
  display: flex;
  gap: clamp(16px, 2.5vw, 26px);
  overflow-x: auto;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
  scrollbar-color: rgba(59, 242, 196, 0.4) transparent;
}

.page-about .tl-track::-webkit-scrollbar {
  height: 6px;
}

.page-about .tl-track::-webkit-scrollbar-thumb {
  background: rgba(59, 242, 196, 0.34);
}

.page-about .tl-item {
  position: relative;
  flex: 0 0 auto;
  width: min(72vw, 236px);
  scroll-snap-align: start;
  padding-top: 22px;
  border-top: 1px solid var(--line-strong);
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  top: -4px;
  left: 0;
  width: 7px;
  height: 7px;
  background: var(--neon);
  box-shadow: 0 0 10px rgba(59, 242, 196, 0.6);
}

.page-about .tl-year {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
  font-size: clamp(24px, 3vw, 28px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--neon);
}

.page-about .tl-title {
  margin: 0 0 8px;
  font-size: 16.5px;
  font-weight: 600;
  line-height: 1.35;
  color: var(--paper);
}

.page-about .tl-text {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.72;
  color: var(--mist);
}

/* ---------- 流程 ---------- */
.page-about .flow-list {
  list-style: none;
  margin: clamp(20px, 3.5vw, 30px) 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
  max-width: 48rem;
}

.page-about .flow-item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  padding: 4px 0 4px 16px;
  border-left: 2px solid rgba(255, 122, 47, 0.42);
}

.page-about .flow-step {
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
  font-size: 11.5px;
  letter-spacing: 0.08em;
  line-height: 1.9;
  color: var(--orange);
  white-space: nowrap;
}

.page-about .flow-body h3 {
  margin: 0 0 5px;
  font-size: 16.5px;
  font-weight: 600;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .flow-body p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- 团队 ---------- */
.page-about .team-grid {
  display: grid;
  gap: clamp(22px, 4vw, 34px);
}

@media (min-width: 760px) {
  .page-about .team-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.66fr);
    align-items: start;
  }
}

.page-about .role-list {
  list-style: none;
  margin: clamp(20px, 3.5vw, 28px) 0 0;
  padding: 0;
  display: grid;
  gap: 8px;
  max-width: 34rem;
}

.page-about .role-list li {
  display: grid;
  grid-template-columns: 40px auto minmax(0, 1fr);
  gap: 12px;
  align-items: baseline;
  padding: 12px 16px;
  background: var(--glass);
  border: 1px solid var(--line);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
}

.page-about .role-num {
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
  font-size: 20px;
  font-weight: 700;
  line-height: 1;
  color: var(--orange);
}

.page-about .role-name {
  font-size: 14.5px;
  font-weight: 600;
  color: var(--paper);
  white-space: nowrap;
}

.page-about .role-desc {
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--mist);
}

/* ---------- 服务范围 ---------- */
.page-about .scope-grid {
  display: grid;
  gap: 10px;
  margin-top: clamp(22px, 4vw, 32px);
  max-width: 52rem;
}

@media (min-width: 760px) {
  .page-about .scope-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .scope-card {
  padding: clamp(15px, 2.4vw, 20px);
  background: var(--panel);
  border-top: 2px solid rgba(59, 242, 196, 0.55);
}

.page-about .scope-label {
  margin: 0 0 8px;
  font-size: 11.5px;
  letter-spacing: 0.14em;
  color: var(--neon);
}

.page-about .scope-text {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: rgba(241, 236, 222, 0.8);
}

/* ---------- 收束 ---------- */
.page-about .about-end {
  margin-top: clamp(8px, 2vw, 16px);
  padding: clamp(22px, 4vw, 40px);
  border: 1px solid var(--line);
  background:
    radial-gradient(100% 120% at 100% 0%, rgba(59, 242, 196, 0.12) 0%, rgba(5, 16, 13, 0) 62%),
    var(--ink-deep);
}

.page-about .about-end .eyebrow {
  margin-top: 0;
}

.page-about .end-title {
  margin: 14px 0 0;
  font-size: clamp(23px, 3.8vw, 40px);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .pledge-grid {
  display: grid;
  gap: 10px;
  margin-top: clamp(22px, 4vw, 32px);
}

@media (min-width: 760px) {
  .page-about .pledge-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .pledge {
  padding: clamp(16px, 2.5vw, 22px);
  background: rgba(18, 51, 42, 0.72);
  border: 1px solid var(--line);
  border-top: 2px solid var(--neon);
}

.page-about .pledge h3 {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 600;
  color: var(--neon-soft);
}

.page-about .pledge p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(241, 236, 222, 0.8);
}

.page-about .end-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: clamp(22px, 4vw, 32px);
}

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

/* ---------- 窄屏微调 ---------- */
@media (max-width: 460px) {
  .page-about .ch-num {
    font-size: 34px;
    padding-top: 8px;
  }

  .page-about .role-list li {
    grid-template-columns: 34px minmax(0, 1fr);
    row-gap: 4px;
  }

  .page-about .role-desc {
    grid-column: 2 / -1;
  }

  .page-about .flow-item {
    grid-template-columns: minmax(0, 1fr);
    gap: 6px;
  }

  .page-about .about-end {
    padding: 20px 16px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .index-list a,
  .page-about .about-copy a {
    transition: none;
  }
}