.page-about {
  --about-rule: rgba(138, 154, 160, 0.22);
  --about-rule-deep: rgba(10, 26, 33, 0.16);

  display: block;
  overflow-x: clip;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-body);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  padding: clamp(24px, 4vw, 44px) 0 clamp(56px, 9vw, 104px);
  background: linear-gradient(158deg, var(--ink) 0%, var(--ink) 48%, var(--ink-deep) 100%);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  z-index: 0;
  top: -16%;
  right: -20%;
  width: min(90vw, 840px);
  aspect-ratio: 1;
  background: linear-gradient(135deg, rgba(16, 27, 51, 0.96) 0%, rgba(30, 49, 56, 0.48) 62%, rgba(10, 26, 33, 0) 100%);
  clip-path: polygon(30% 0, 100% 8%, 100% 100%, 0 78%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  z-index: 0;
  inset: 0;
  background-image:
    repeating-linear-gradient(58deg, rgba(47, 214, 196, 0.055) 0 1px, transparent 1px 36px),
    repeating-linear-gradient(-58deg, rgba(47, 214, 196, 0.045) 0 1px, transparent 1px 36px);
  pointer-events: none;
}

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

.page-about .breadcrumb {
  margin-bottom: clamp(26px, 5vw, 52px);
}

.page-about .breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.02em;
}

.page-about .breadcrumb-list > li {
  display: flex;
  align-items: center;
}

.page-about .breadcrumb-list > li + li::before {
  content: "/";
  margin: 0 10px;
  color: var(--mist);
  opacity: 0.55;
}

.page-about .breadcrumb-link {
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.25s var(--ease), border-color 0.25s var(--ease);
}

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

.page-about .breadcrumb-current {
  color: var(--paper);
}

.page-about .about-hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(30px, 5vw, 56px);
  align-items: start;
}

.page-about .about-eyebrow {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  color: var(--cyan);
}

.page-about .about-title {
  margin: 0 0 clamp(18px, 3vw, 26px);
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2rem, 6.4vw, 3.35rem);
  line-height: 1.2;
  letter-spacing: 0.005em;
  color: var(--paper);
  text-wrap: balance;
}

.page-about .about-lede {
  margin: 0;
  max-width: 60ch;
  font-size: clamp(1rem, 2.2vw, 1.125rem);
  line-height: 1.9;
  color: rgba(243, 239, 230, 0.78);
}

.page-about .about-facts {
  display: flex;
  flex-wrap: wrap;
  gap: clamp(18px, 4vw, 48px);
  margin: clamp(28px, 4vw, 42px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-fact {
  position: relative;
  padding-left: 14px;
}

.page-about .about-fact::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  bottom: 6px;
  width: 1px;
  background: var(--line-gold);
}

.page-about .about-fact-k {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  color: var(--mist);
}

.page-about .about-fact-v {
  display: block;
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: clamp(1.125rem, 2.6vw, 1.5rem);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--gold-light);
}

.page-about .about-hero-media {
  margin: 0;
  width: 100%;
  aspect-ratio: 3 / 4;
}

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

.page-about .about-hero-media .media-caption {
  margin-top: 14px;
  font-size: 0.8125rem;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 引文带 ---------- */
.page-about .about-quote-band {
  position: relative;
  padding: clamp(44px, 7vw, 88px) 0;
  background: var(--night);
  border-top: 1px solid var(--line-cyan);
  border-bottom: 1px solid var(--line-gold);
}

.page-about .about-quote {
  margin: 0;
  padding-left: clamp(20px, 4vw, 46px);
  border-left: 3px solid var(--gold);
  max-width: 48ch;
}

.page-about .about-quote p {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.2rem, 3.1vw, 1.85rem);
  line-height: 1.65;
  color: var(--paper);
}

.page-about .about-quote-source {
  margin-top: 22px;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.1em;
  color: var(--mist);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-chapter {
  position: relative;
  padding: clamp(56px, 9vw, 112px) 0;
}

.page-about .about-chapter--ink {
  background: var(--ink);
}

.page-about .about-chapter--night {
  background: linear-gradient(180deg, var(--ink-deep) 0%, var(--night) 100%);
}

.page-about .about-chapter--paper {
  background: var(--paper);
  color: var(--ink);
}

.page-about .about-chapter-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(18px, 4vw, 38px);
}

.page-about .about-chapter-aside {
  display: flex;
  align-items: baseline;
  gap: 16px;
}

.page-about .about-num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(2.9rem, 11vw, 5.4rem);
  line-height: 0.82;
  letter-spacing: -0.05em;
  color: var(--gold);
  opacity: 0.9;
}

.page-about .about-chapter-kicker {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  color: var(--mist);
  white-space: nowrap;
}

.page-about .about-chapter-body > * + * {
  margin-top: clamp(20px, 3vw, 32px);
}

.page-about .about-chapter-body > .section-title {
  margin-bottom: 0;
}

.page-about .about-chapter--paper .section-title {
  color: var(--ink);
}

.page-about .about-chapter--paper .lede {
  color: rgba(10, 26, 33, 0.76);
}

.page-about .about-chapter--paper .about-chapter-kicker {
  color: rgba(10, 26, 33, 0.55);
}

.page-about .about-chapter--paper .about-num {
  color: var(--clay);
  opacity: 1;
}

/* ---------- 四阶段轨迹 ---------- */
.page-about .stage-track {
  display: grid;
  grid-template-columns: repeat(4, minmax(136px, 1fr));
  gap: 14px;
  margin: clamp(30px, 5vw, 46px) 0 0;
  padding: 0 0 12px;
  list-style: none;
  overflow-x: auto;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
}

.page-about .stage-node {
  position: relative;
  scroll-snap-align: start;
}

.page-about .stage-node::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, var(--line-cyan) 0%, var(--line-gold) 100%);
  transform: rotate(-2.2deg);
  transform-origin: left center;
}

.page-about .stage-link {
  display: block;
  position: relative;
  padding: 26px 6px 0 0;
  color: inherit;
  text-decoration: none;
}

.page-about .stage-dot {
  position: absolute;
  top: -5px;
  left: 0;
  width: 11px;
  height: 11px;
  background: var(--ink);
  border: 1px solid var(--gold);
  transform: rotate(45deg);
  transition: background 0.3s var(--ease), border-color 0.3s var(--ease), box-shadow 0.3s var(--ease);
}

.page-about .stage-node:hover .stage-dot,
.page-about .stage-link:focus-visible .stage-dot {
  background: var(--gold-light);
  border-color: var(--gold-light);
  box-shadow: 0 0 0 6px rgba(201, 162, 39, 0.18);
}

.page-about .stage-year {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.125rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--gold-light);
}

.page-about .stage-label {
  display: block;
  margin-top: 7px;
  font-size: 0.9375rem;
  color: var(--mist);
  transition: color 0.3s var(--ease);
}

.page-about .stage-node:hover .stage-label,
.page-about .stage-link:focus-visible .stage-label {
  color: var(--paper);
}

.page-about .stage-detail {
  display: grid;
  gap: clamp(18px, 3vw, 28px);
  margin: clamp(34px, 5vw, 54px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .stage-item {
  padding-top: 18px;
  border-top: 1px solid var(--line-mute);
  scroll-margin-top: 108px;
}

.page-about .stage-item-title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: clamp(1.0625rem, 2.2vw, 1.25rem);
  font-weight: 700;
  line-height: 1.55;
  color: var(--paper);
}

.page-about .stage-item p {
  margin: 0;
  max-width: 64ch;
  font-size: 1rem;
  line-height: 1.85;
  color: rgba(243, 239, 230, 0.8);
}

/* ---------- 服务对象 ---------- */
.page-about .about-roles {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-role {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
  padding: clamp(22px, 3.4vw, 34px) 0;
  border-top: 1px solid var(--line-mute);
}

.page-about .about-role:last-child {
  border-bottom: 1px solid var(--line-mute);
}

.page-about .about-role-num {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  letter-spacing: 0.14em;
  color: var(--cyan);
}

.page-about .about-role-title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.125rem, 2.4vw, 1.375rem);
  font-weight: 700;
  line-height: 1.5;
  color: var(--paper);
}

.page-about .about-role-body p {
  margin: 0;
  font-size: 1rem;
  line-height: 1.85;
  color: rgba(243, 239, 230, 0.8);
}

.page-about .about-role-body .about-role-meta {
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.02em;
  color: var(--mist);
}

.page-about .about-role-meta a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--line-cyan);
  transition: color 0.25s var(--ease), border-color 0.25s var(--ease);
}

.page-about .about-role-meta a:hover,
.page-about .about-role-meta a:focus-visible {
  color: var(--gold-light);
  border-bottom-color: var(--line-gold);
}

/* ---------- 团队 ---------- */
.page-about .about-team-media {
  margin: clamp(30px, 5vw, 52px) 0 0;
  position: relative;
  aspect-ratio: 3 / 2;
}

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

.page-about .about-team-media .media-caption {
  margin-top: 14px;
  font-size: 0.8125rem;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .about-filter {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-top: clamp(28px, 4vw, 44px);
}

.page-about .about-team {
  margin: clamp(14px, 2.5vw, 22px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-team-item {
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
  padding: clamp(20px, 3vw, 30px) 0;
  border-top: 1px solid var(--line-mute);
}

.page-about .about-team-role {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.0625rem, 2.2vw, 1.25rem);
  font-weight: 700;
  line-height: 1.5;
  color: var(--paper);
}

.page-about .about-team-count {
  display: flex;
  align-items: baseline;
  gap: 4px;
  font-family: var(--font-mono);
  color: var(--gold);
}

.page-about .about-team-num {
  font-size: clamp(1.5rem, 3.6vw, 2.1rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
}

.page-about .about-team-unit {
  font-size: 0.875rem;
  color: var(--mist);
}

.page-about .about-team-desc {
  margin: 0;
  font-size: 1rem;
  line-height: 1.85;
  color: rgba(243, 239, 230, 0.8);
}

.page-about .about-team-item[hidden] {
  display: none;
}

/* ---------- 服务承诺 ---------- */
.page-about .about-pledges {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-pledge {
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
  padding: clamp(20px, 3vw, 28px) 0;
  border-top: 1px solid var(--about-rule-deep);
}

.page-about .about-pledge:last-child {
  border-bottom: 1px solid var(--about-rule-deep);
}

.page-about .about-pledge-tag {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  color: var(--clay);
}

.page-about .about-pledge-title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.0625rem, 2.2vw, 1.25rem);
  font-weight: 700;
  line-height: 1.5;
  color: var(--ink);
}

.page-about .about-pledge p {
  margin: 0;
  font-size: 1rem;
  line-height: 1.85;
  color: rgba(10, 26, 33, 0.76);
}

.page-about .about-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: clamp(26px, 4vw, 40px);
}

.page-about .about-chapter--paper .btn-outline {
  color: var(--ink-deep);
  border-color: var(--gold);
  background: transparent;
}

.page-about .about-chapter--paper .btn-outline:hover,
.page-about .about-chapter--paper .btn-outline:focus-visible {
  background: var(--gold);
  color: var(--ink-deep);
}

.page-about .about-chapter--paper .btn-quiet {
  color: var(--ink-deep);
  border-color: rgba(10, 26, 33, 0.32);
}

.page-about .about-chapter--paper .btn-quiet:hover,
.page-about .about-chapter--paper .btn-quiet:focus-visible {
  border-color: var(--clay);
  color: var(--clay);
}

/* ---------- 资质与归属 ---------- */
.page-about .about-chapter--seal {
  overflow: hidden;
}

.page-about .about-seal-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  margin: 0;
  opacity: 0.11;
  pointer-events: none;
}

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

.page-about .about-chapter--seal .shell {
  position: relative;
  z-index: 1;
}

.page-about .about-seal-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin: 0;
  background: var(--about-rule-deep);
  border: 1px solid var(--about-rule-deep);
}

.page-about .about-seal-item {
  padding: clamp(18px, 3vw, 26px);
  background: rgba(243, 239, 230, 0.9);
}

.page-about .about-seal-k {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  color: rgba(10, 26, 33, 0.55);
}

.page-about .about-seal-v {
  display: block;
  margin-top: 10px;
  font-family: var(--font-display);
  font-size: clamp(1rem, 2.2vw, 1.1875rem);
  font-weight: 700;
  line-height: 1.5;
  color: var(--ink);
  word-break: break-word;
}

.page-about .about-honor {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3vw, 34px);
  margin-top: clamp(28px, 4vw, 42px);
}

.page-about .about-honor-col {
  padding-top: 18px;
  border-top: 2px solid var(--gold);
}

.page-about .about-honor-title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: clamp(1.0625rem, 2.2vw, 1.1875rem);
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-honor-col p {
  margin: 0;
  font-size: 1rem;
  line-height: 1.85;
  color: rgba(10, 26, 33, 0.76);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-seal-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 760px) {
  .page-about .about-pledge {
    grid-template-columns: 132px minmax(0, 3fr) minmax(0, 7fr);
    gap: 0 clamp(18px, 2.6vw, 34px);
    align-items: baseline;
  }

  .page-about .about-pledge-tag {
    padding-top: 4px;
  }

  .page-about .about-team-item {
    grid-template-columns: minmax(0, 4fr) 92px minmax(0, 7fr);
    gap: 0 clamp(18px, 2.6vw, 36px);
    align-items: baseline;
  }
}

@media (min-width: 860px) {
  .page-about .about-role {
    grid-template-columns: 68px minmax(0, 4fr) minmax(0, 7fr);
    gap: 0 clamp(20px, 3vw, 40px);
    align-items: start;
  }

  .page-about .about-honor {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  }
}

@media (min-width: 940px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: clamp(36px, 5vw, 68px);
  }

  .page-about .about-chapter-grid {
    grid-template-columns: minmax(0, 3fr) minmax(0, 7fr);
    gap: clamp(28px, 5vw, 72px);
  }

  .page-about .about-chapter-aside {
    flex-direction: column;
    align-items: flex-start;
    gap: 14px;
    position: sticky;
    top: 92px;
    align-self: start;
  }

  .page-about .about-num {
    margin-left: -0.12em;
  }

  .page-about .about-chapter-kicker {
    padding-left: 4px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition-duration: 0.01ms !important;
  }
}