.page-about {
  background: var(--c-space);
  color: var(--c-tianshan);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(26px, 5vw, 56px) 0 clamp(28px, 4vw, 48px);
  border-bottom: var(--line);
  background:
    radial-gradient(130% 90% at 88% -25%, rgba(53, 208, 192, 0.16), transparent 62%),
    linear-gradient(180deg, rgba(18, 41, 74, 0.78), rgba(11, 27, 51, 0));
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: repeating-linear-gradient(0deg, rgba(201, 212, 226, 0.05) 0 1px, transparent 1px 7px);
}

.page-about .about-hero .container {
  position: relative;
  z-index: 1;
}

.page-about .about-title {
  margin: 18px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2.3rem, 8.2vw, 5.2rem);
  line-height: 0.98;
  letter-spacing: -0.02em;
  color: var(--c-paper);
}

.page-about .about-lede {
  margin: 22px 0 0;
  max-width: 54ch;
  font-size: clamp(1rem, 1.6vw, 1.0625rem);
  line-height: 1.9;
  color: var(--c-mist);
}

.page-about .about-meta {
  list-style: none;
  margin: 30px 0 0;
  padding: 14px 0 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  border-top: var(--line);
}

.page-about .about-meta li {
  display: grid;
  gap: 7px;
  min-width: 0;
}

.page-about .meta-key {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.12em;
  color: var(--c-mist);
}

.page-about .meta-val {
  font-family: var(--font-mono);
  font-size: 0.9375rem;
  letter-spacing: 0.06em;
  color: var(--c-amber);
  overflow-wrap: anywhere;
}

/* ---------- 主体栅格 ---------- */
.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 4vw, 40px);
  padding-block: clamp(24px, 4vw, 52px) clamp(44px, 6vw, 84px);
}

.page-about .about-flow {
  display: grid;
  gap: clamp(18px, 3vw, 30px);
  min-width: 0;
}

/* ---------- 书脊索引 ---------- */
.page-about .about-spine {
  display: none;
}

.page-about .spine-cap {
  margin: 0;
  padding-bottom: 12px;
  border-bottom: 1px solid rgba(53, 208, 192, 0.38);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.2em;
  color: rgba(143, 163, 191, 0.8);
}

.page-about .spine-list {
  list-style: none;
  margin: 6px 0 0;
  padding: 0;
}

.page-about .spine-link {
  display: grid;
  grid-template-columns: 8px minmax(0, 1fr);
  gap: 10px;
  padding: 12px 0;
  border-bottom: 1px solid rgba(201, 212, 226, 0.12);
  text-decoration: none;
  transition: border-color 0.14s var(--ease);
}

.page-about .spine-link:hover,
.page-about .spine-link:focus-visible {
  border-bottom-color: rgba(53, 208, 192, 0.55);
}

.page-about .spine-link:focus-visible {
  outline: 1px solid var(--c-teal);
  outline-offset: 3px;
}

.page-about .spine-mark {
  width: 7px;
  height: 7px;
  margin-top: 6px;
  background: rgba(232, 163, 61, 0.55);
  transition: background-color 0.14s var(--ease);
}

.page-about .spine-link:hover .spine-mark,
.page-about .spine-link:focus-visible .spine-mark {
  background: var(--c-teal);
}

.page-about .spine-year {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.1em;
  color: var(--c-paper);
}

.page-about .spine-note {
  display: block;
  margin-top: 3px;
  font-size: 0.75rem;
  line-height: 1.55;
  color: var(--c-mist);
}

/* ---------- 纸页区块 ---------- */
.page-about .sheet {
  --sheet-accent: var(--c-teal);
  --sheet-head: var(--c-paper);
  --sheet-text: var(--c-mist);
  position: relative;
  padding: clamp(22px, 4vw, 44px);
  background: var(--c-night);
  border: 1px solid rgba(201, 212, 226, 0.16);
  box-shadow: 0 26px 52px -42px rgba(0, 0, 0, 0.95);
  color: var(--sheet-text);
  min-width: 0;
}

.page-about .sheet::after {
  content: "";
  position: absolute;
  inset: 5px;
  border: 1px solid rgba(201, 212, 226, 0.08);
  pointer-events: none;
}

.page-about .sheet--paper {
  --sheet-accent: #0e7c72;
  --sheet-head: var(--c-paper-ink);
  --sheet-text: #45516a;
  background: var(--c-paper);
  border-color: rgba(27, 36, 52, 0.14);
  box-shadow: 0 32px 62px -50px rgba(0, 0, 0, 0.9);
}

.page-about .sheet--paper::after {
  border-color: rgba(27, 36, 52, 0.09);
}

.page-about .sheet-num {
  display: block;
  margin-bottom: 12px;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.18em;
  color: var(--sheet-accent);
}

.page-about .sheet h2 {
  margin: 0 0 16px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.5rem, 3.4vw, 2.125rem);
  line-height: 1.14;
  letter-spacing: -0.01em;
  color: var(--sheet-head);
}

.page-about .sheet p {
  margin: 0 0 14px;
  max-width: 62ch;
  font-size: 1rem;
  line-height: 1.85;
}

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

.page-about .pullquote {
  margin: 22px 0 0;
  padding: 4px 0 4px 16px;
  border-left: 2px solid var(--sheet-accent);
  font-family: var(--font-serif);
  font-size: clamp(1rem, 2vw, 1.1875rem);
  line-height: 1.75;
  color: var(--sheet-head);
}

/* ---------- 团队 ---------- */
.page-about .team-grid {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 20px;
}

.page-about .role {
  padding-top: 16px;
  border-top: 1px solid rgba(201, 212, 226, 0.22);
}

.page-about .role-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(2.5rem, 6vw, 3.5rem);
  font-weight: 500;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--c-amber);
  font-variant-numeric: tabular-nums;
}

.page-about .role-name {
  margin: 12px 0 6px;
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--c-paper);
}

.page-about .sheet .role-desc {
  margin: 0;
  max-width: none;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--c-mist);
}

.page-about .about-figure {
  margin: 26px 0 0;
}

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

.page-about .sheet .media__caption {
  margin-top: 10px;
  font-size: 0.8125rem;
  line-height: 1.6;
  color: var(--c-mist);
}

.page-about .sheet--paper .media__caption {
  color: #5a6580;
}

.page-about .sub-h {
  margin: 30px 0 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid rgba(201, 212, 226, 0.16);
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.25rem;
  letter-spacing: 0.01em;
  color: var(--c-paper);
}

.page-about .hands {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .hands li {
  display: grid;
  grid-template-columns: 24px minmax(0, 1fr);
  gap: 12px;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--c-mist);
}

.page-about .hands-key {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  line-height: 1.95;
  letter-spacing: 0.1em;
  color: var(--c-teal);
}

/* ---------- 时间轴 ---------- */
.page-about .milestones {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  position: relative;
}

.page-about .milestones::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 12px;
  bottom: 16px;
  width: 1px;
  background: linear-gradient(180deg, rgba(232, 163, 61, 0.75), rgba(14, 124, 114, 0.45));
}

.page-about .milestone {
  position: relative;
  padding: 0 0 26px 34px;
}

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

.page-about .milestone::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 5px;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: var(--c-amber);
  box-shadow: 0 0 0 4px var(--c-paper);
}

.page-about .milestone-year {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  color: #0e7c72;
}

.page-about .milestone-body h3 {
  margin: 0 0 8px;
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--c-paper-ink);
}

.page-about .sheet .milestone-body p {
  margin: 0;
  max-width: 58ch;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: #45516a;
}

/* ---------- 评分卡 ---------- */
.page-about .scorecard {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 18px;
  grid-template-columns: minmax(0, 1fr);
}

.page-about .score {
  padding-top: 14px;
  border-top: 2px solid rgba(53, 208, 192, 0.38);
}

.page-about .score-id {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.16em;
  color: var(--c-amber);
}

.page-about .score-name {
  margin: 0 0 8px;
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--c-paper);
}

.page-about .sheet .score-desc {
  margin: 0;
  max-width: none;
  font-size: 0.875rem;
  line-height: 1.75;
  color: var(--c-mist);
}

.page-about .review-figures {
  list-style: none;
  margin: 28px 0 0;
  padding: 18px 0 0;
  border-top: 1px solid rgba(201, 212, 226, 0.18);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.page-about .rf-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.5rem;
  letter-spacing: -0.02em;
  color: var(--c-teal);
  font-variant-numeric: tabular-nums;
}

.page-about .rf-label {
  display: block;
  margin-top: 6px;
  font-size: 0.75rem;
  line-height: 1.5;
  color: var(--c-mist);
}

/* ---------- 服务地区 ---------- */
.page-about .sheet--reach {
  --sheet-head: var(--c-paper);
  --sheet-text: #b9c6d8;
  overflow: hidden;
  background: var(--c-ink);
}

.page-about .reach-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.42;
}

.page-about .sheet--reach::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background: linear-gradient(180deg, rgba(6, 16, 31, 0.88) 0%, rgba(6, 16, 31, 0.62) 58%, rgba(6, 16, 31, 0.9) 100%);
}

.page-about .reach-inner {
  position: relative;
  z-index: 2;
}

.page-about .reach-facts {
  margin: 22px 0 18px;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0 18px;
  border-top: 1px solid rgba(201, 212, 226, 0.18);
  border-bottom: 1px solid rgba(201, 212, 226, 0.18);
}

.page-about .reach-fact {
  padding: 14px 0;
  min-width: 0;
}

.page-about .reach-fact dt {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.12em;
  color: var(--c-mist);
}

.page-about .reach-fact dd {
  margin: 6px 0 0;
  font-size: 0.9375rem;
  line-height: 1.5;
  color: var(--c-paper);
  overflow-wrap: anywhere;
}

/* ---------- 反馈路径 ---------- */
.page-about .loop {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .loop li {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 14px;
  padding-top: 14px;
  border-top: 1px solid rgba(27, 36, 52, 0.14);
}

.page-about .loop-num {
  padding-top: 3px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  color: #0e7c72;
}

.page-about .loop-body h3 {
  margin: 0 0 6px;
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--c-paper-ink);
}

.page-about .sheet .loop-body p {
  margin: 0;
  max-width: 54ch;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: #45516a;
}

.page-about .sheet .loop-tail {
  margin: 24px 0 0;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 延伸链接 ---------- */
.page-about .about-next {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
  padding-top: 20px;
  border-top: 1px solid rgba(201, 212, 226, 0.18);
}

.page-about .about-next a {
  padding-bottom: 3px;
  border-bottom: 1px solid transparent;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  color: var(--c-mist);
  text-decoration: none;
  transition: color 0.14s var(--ease), border-color 0.14s var(--ease);
}

.page-about .about-next a:hover,
.page-about .about-next a:focus-visible {
  color: var(--c-teal);
  border-bottom-color: rgba(53, 208, 192, 0.6);
}

.page-about .about-next a:focus-visible {
  outline: 1px solid var(--c-teal);
  outline-offset: 3px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .team-grid {
    grid-template-columns: 1.1fr 0.95fr 0.95fr;
    gap: 22px;
  }

  .page-about .milestone {
    display: grid;
    grid-template-columns: 84px minmax(0, 1fr);
    gap: 18px;
  }

  .page-about .milestone-year {
    margin-bottom: 0;
    padding-top: 4px;
  }

  .page-about .scorecard {
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  }

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

@media (min-width: 1024px) {
  .page-about .about-body {
    grid-template-columns: 172px minmax(0, 1fr);
    gap: clamp(28px, 4vw, 56px);
    align-items: start;
  }

  .page-about .about-spine {
    display: block;
    position: sticky;
    top: 104px;
  }

  .page-about .sheet {
    padding: clamp(30px, 3.4vw, 48px);
  }

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

@media (min-width: 1280px) {
  .page-about .about-title {
    max-width: 18ch;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .spine-link,
  .page-about .spine-mark,
  .page-about .about-next a {
    transition: none;
  }
}