.page-about {
  --about-hair: rgba(16, 16, 20, 0.10);
  --about-gold-30: rgba(201, 162, 39, 0.34);
  --about-on-ink-line: rgba(239, 226, 192, 0.20);
  --about-card: rgba(255, 255, 255, 0.64);
  display: block;
}

/* ---------- 面包屑 ---------- */
.page-about .about-breadcrumb-wrap {
  padding-top: 18px;
  padding-bottom: 2px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: 34px 0 52px;
  overflow: hidden;
  background:
    radial-gradient(118% 92% at 90% -4%, rgba(201, 162, 39, 0.16), transparent 62%),
    radial-gradient(88% 72% at -4% 14%, rgba(200, 16, 46, 0.07), transparent 64%);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--ink-06) 1px, transparent 1px),
    linear-gradient(90deg, var(--ink-06) 1px, transparent 1px);
  background-size: 68px 68px;
  pointer-events: none;
}

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

.page-about .about-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 32px;
}

.page-about .about-hero h1 {
  margin: 20px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2.05rem, 5.6vw, 4.15rem);
  line-height: 1.12;
  letter-spacing: -0.02em;
  color: var(--ink);
  max-width: 15em;
}

.page-about .about-lede {
  margin: 22px 0 0;
  max-width: 34em;
  font-size: 1.0625rem;
  line-height: 1.9;
  color: var(--graphite);
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

/* 侧栏索引卡 */
.page-about .about-index-card {
  padding: 22px 24px 14px;
  border: 1px solid var(--mist);
  border-radius: var(--r-lg);
  background: linear-gradient(158deg, rgba(255, 255, 255, 0.88), rgba(239, 226, 192, 0.30));
}

.page-about .about-index-title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--gold-deep);
}

.page-about .about-index-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-index-list a {
  display: flex;
  align-items: center;
  gap: 14px;
  min-height: 44px;
  padding: 8px 4px;
  border-bottom: 1px solid var(--ink-06);
  color: var(--ink);
  font-size: 0.9375rem;
  text-decoration: none;
  transition: color 180ms var(--ease), background-color 180ms var(--ease);
}

.page-about .about-index-list li:last-child a {
  border-bottom: 0;
}

.page-about .about-index-list a:hover,
.page-about .about-index-list a:focus-visible {
  color: var(--red);
  background: rgba(246, 217, 220, 0.55);
}

.page-about .about-index-list .mono {
  flex: none;
  min-width: 2.4em;
  font-size: 0.8125rem;
  color: var(--gold-deep);
  transition: color 180ms var(--ease);
}

.page-about .about-index-list a:hover .mono {
  color: var(--red);
}

/* 首屏数据 */
.page-about .about-hero-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: 46px;
  border: 1px solid var(--mist);
  border-radius: var(--r-lg);
  overflow: hidden;
  background: var(--mist);
}

.page-about .about-hero-stats > div {
  padding: 20px 20px 22px;
  background: rgba(255, 255, 255, 0.66);
}

.page-about .about-stat-value {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 3.1vw, 2.05rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--red);
  line-height: 1.15;
}

.page-about .about-stat-unit {
  margin-left: 0.15em;
  font-size: 0.5em;
  color: var(--gold-deep);
}

.page-about .about-stat-label {
  display: block;
  margin-top: 8px;
  font-size: 0.875rem;
  line-height: 1.65;
  color: var(--graphite);
}

/* ---------- 章节引线 ---------- */
.page-about .about-rule-row {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px 20px;
  margin-bottom: 28px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--mist);
}

.page-about .about-rule-meta {
  font-size: 0.8125rem;
  color: var(--graphite);
  letter-spacing: 0.04em;
}

/* ---------- A2 我们做的事 ---------- */
.page-about .about-scope-grid {
  align-items: start;
}

.page-about .about-scope-prose p {
  margin-top: 0;
}

.page-about .about-scene-card {
  padding: 24px 24px 20px;
  border: 1px solid var(--mist);
  border-radius: var(--r-lg);
  background: var(--about-card);
}

.page-about .about-scene-title {
  margin: 0 0 16px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.125rem;
  color: var(--ink);
}

.page-about .about-scene-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 14px;
}

.page-about .about-scene-list li {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--graphite);
}

.page-about .about-scene-idx {
  flex: none;
  padding-top: 2px;
  font-size: 0.8125rem;
  font-weight: 700;
  color: var(--gold-deep);
}

.page-about .about-scene-foot {
  margin: 20px 0 0;
  padding-top: 16px;
  border-top: 1px solid var(--ink-06);
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--red);
}

/* ---------- A3 命名方法 ---------- */
.page-about .about-method-grid {
  align-items: start;
}

.page-about .about-method-figure {
  margin: 0;
}

.page-about .about-method-figure .media-frame {
  border: 1px solid var(--mist);
  border-radius: var(--r-lg);
  overflow: hidden;
}

.page-about .about-method-figure img,
.page-about .about-team-figure img,
.page-about .about-timeline-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
}

.page-about .about-method-figure .media-caption {
  margin-top: 10px;
  font-size: 0.8125rem;
  color: var(--graphite);
}

.page-about .about-steps {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 16px;
  counter-reset: about-step;
}

.page-about .about-step {
  position: relative;
  counter-increment: about-step;
  padding: 22px 24px 22px 70px;
  border: 1px solid var(--mist);
  border-radius: var(--r-lg);
  background: rgba(255, 255, 255, 0.66);
  transition: transform 180ms var(--ease), border-color 180ms var(--ease), box-shadow 180ms var(--ease);
}

.page-about .about-step::before {
  content: "0" counter(about-step);
  position: absolute;
  left: 24px;
  top: 24px;
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--red);
}

.page-about .about-step::after {
  content: "";
  position: absolute;
  left: 47px;
  top: 52px;
  bottom: 22px;
  width: 1px;
  background: linear-gradient(180deg, var(--about-gold-30), transparent);
}

.page-about .about-step:hover {
  transform: translateY(-4px);
  border-color: var(--gold);
  box-shadow: 0 16px 32px -24px rgba(16, 16, 20, 0.4);
}

.page-about .about-step-title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.125rem;
  color: var(--ink);
}

.page-about .about-step p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.85;
  color: var(--graphite);
}

/* ---------- A4 发展脉络 ---------- */
.page-about .about-timeline-figure {
  margin: 0 0 38px;
}

.page-about .about-timeline-figure .media-frame {
  border: 1px solid var(--about-on-ink-line);
  border-radius: var(--r-lg);
  overflow: hidden;
}

.page-about .about-timeline-figure .media-caption {
  margin-top: 10px;
  font-size: 0.8125rem;
  color: rgba(247, 243, 234, 0.62);
}

.page-about .about-tl {
  position: relative;
  margin: 0;
  padding: 0 0 0 28px;
  list-style: none;
  display: grid;
  gap: 12px;
}

.page-about .about-tl::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--gold) 0%, rgba(201, 162, 39, 0.14) 100%);
}

.page-about .about-tl-node {
  position: relative;
}

.page-about .about-tl-dot {
  position: absolute;
  left: -25px;
  top: 50%;
  width: 10px;
  height: 10px;
  margin-top: -5px;
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 0 4px rgba(201, 162, 39, 0.16);
}

.page-about .about-tl-details {
  border: 1px solid var(--about-on-ink-line);
  border-radius: var(--r-md);
  background: rgba(255, 255, 255, 0.04);
  transition: border-color 180ms var(--ease), background-color 180ms var(--ease);
}

.page-about .about-tl-details[open] {
  border-color: var(--about-gold-30);
  background: rgba(201, 162, 39, 0.08);
}

.page-about .about-tl-head {
  display: flex;
  align-items: center;
  gap: 16px;
  min-height: 56px;
  padding: 14px 20px;
  cursor: pointer;
  list-style: none;
  color: var(--mist);
}

.page-about .about-tl-head::-webkit-details-marker {
  display: none;
}

.page-about .about-tl-head::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 1.125rem;
  line-height: 1;
  color: var(--gold);
}

.page-about .about-tl-details[open] .about-tl-head::after {
  content: "−";
}

.page-about .about-tl-head:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 2px;
  border-radius: var(--r-md);
}

.page-about .about-tl-year {
  flex: none;
  min-width: 4.4em;
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--gold);
}

.page-about .about-tl-title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.0625rem;
  line-height: 1.4;
  color: var(--ivory);
}

.page-about .about-tl-body {
  padding: 16px 20px 20px;
  border-top: 1px solid var(--about-on-ink-line);
}

.page-about .about-tl-body p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.85;
  color: var(--ivory-70);
}

/* ---------- A5 团队 ---------- */
.page-about .about-team-grid {
  align-items: start;
}

.page-about .about-roles {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
}

.page-about .about-role {
  padding: 22px 24px;
  border: 1px solid var(--mist);
  border-radius: var(--r-lg);
  background: linear-gradient(158deg, rgba(255, 255, 255, 0.88), rgba(239, 226, 192, 0.26));
  transition: transform 180ms var(--ease), border-color 180ms var(--ease);
}

.page-about .about-role:hover {
  transform: translateY(-4px);
  border-color: var(--gold);
}

.page-about .about-role-head {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--ink-06);
}

.page-about .about-role-name {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.125rem;
  color: var(--ink);
}

.page-about .about-role-count {
  margin-left: auto;
  font-size: 1.375rem;
  font-weight: 700;
  color: var(--red);
  letter-spacing: -0.01em;
}

.page-about .about-role p {
  margin: 14px 0 0;
  font-size: 0.9375rem;
  line-height: 1.85;
  color: var(--graphite);
}

.page-about .about-team-figure {
  margin: 0;
}

.page-about .about-team-figure .media-frame {
  border: 1px solid var(--mist);
  border-radius: var(--r-lg);
  overflow: hidden;
  background: rgba(228, 232, 239, 0.5);
}

.page-about .about-team-figure .media-caption {
  margin-top: 10px;
  font-size: 0.8125rem;
  color: var(--graphite);
}

/* ---------- A6 资质与协作 ---------- */
.page-about .about-cred-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .about-cred-item {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  padding: 22px 24px;
  border-left: 2px solid var(--red);
  border-radius: 0 var(--r-md) var(--r-md) 0;
  background: rgba(255, 255, 255, 0.66);
  transition: background-color 180ms var(--ease), border-color 180ms var(--ease);
}

.page-about .about-cred-item:hover {
  background: rgba(239, 226, 192, 0.34);
  border-left-color: var(--gold);
}

.page-about .about-cred-mark {
  flex: none;
  min-width: 2.4em;
  padding-top: 3px;
  font-size: 0.8125rem;
  font-weight: 700;
  color: var(--gold-deep);
}

.page-about .about-cred-item h3 {
  margin: 0 0 8px;
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 1rem;
  line-height: 1.5;
  color: var(--ink);
}

.page-about .about-cred-item p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.85;
  color: var(--graphite);
}

/* ---------- A7 交付结果 ---------- */
.page-about .about-result-band {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-bottom: 32px;
  border: 1px solid var(--mist);
  border-radius: var(--r-lg);
  overflow: hidden;
  background: var(--mist);
}

.page-about .about-result-cell {
  padding: 22px 20px;
  background: rgba(255, 255, 255, 0.72);
}

.page-about .about-result-value {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.3125rem, 2.5vw, 1.75rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.2;
  color: var(--celadon);
}

.page-about .about-result-label {
  display: block;
  margin-top: 8px;
  font-size: 0.8125rem;
  line-height: 1.65;
  color: var(--graphite);
}

.page-about .about-entry-note {
  padding: 28px 26px 26px;
  border: 1px solid var(--about-gold-30);
  border-radius: var(--r-lg);
  background: linear-gradient(142deg, rgba(201, 162, 39, 0.12), rgba(247, 243, 234, 0.5) 62%);
}

.page-about .about-entry-title {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.25rem;
  line-height: 1.4;
  color: var(--ink);
}

.page-about .about-entry-note p {
  margin: 0 0 14px;
  max-width: 40em;
  font-size: 0.9375rem;
  line-height: 1.9;
  color: var(--graphite);
}

.page-about .about-entry-note p:last-of-type {
  margin-bottom: 0;
}

.page-about .about-entry-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

/* ---------- 收尾坐标带 ---------- */
.page-about .about-next {
  padding: 8px 0 76px;
}

.page-about .about-next-band {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
  padding-top: 24px;
  border-top: 2px solid var(--red);
}

.page-about .about-next-lead {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.25rem;
  line-height: 1.4;
  color: var(--ink);
}

.page-about .about-next-links {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .about-next-links a {
  display: block;
  height: 100%;
  padding: 18px 20px;
  border: 1px solid var(--mist);
  border-radius: var(--r-md);
  background: rgba(255, 255, 255, 0.55);
  color: var(--graphite);
  font-size: 0.9375rem;
  line-height: 1.7;
  text-decoration: none;
  transition: transform 180ms var(--ease), border-color 180ms var(--ease), background-color 180ms var(--ease);
}

.page-about .about-next-links a:hover,
.page-about .about-next-links a:focus-visible {
  transform: translateY(-4px);
  border-color: var(--gold);
  background: rgba(255, 255, 255, 0.9);
}

.page-about .about-next-links strong {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.0625rem;
  color: var(--red);
}

/* ---------- 显现动效 ---------- */
.page-about [data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 420ms var(--ease), transform 420ms var(--ease);
}

.page-about [data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  .page-about [data-reveal] {
    opacity: 1;
    transform: none;
    transition: opacity 120ms linear;
  }

  .page-about .about-step:hover,
  .page-about .about-role:hover,
  .page-about .about-next-links a:hover {
    transform: none;
  }
}

/* ---------- 断点 ---------- */
@media (min-width: 640px) {
  .page-about .about-hero-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-about .about-cred-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }

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

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

@media (min-width: 880px) {
  .page-about .about-hero {
    padding: 44px 0 64px;
  }

  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: 52px;
    align-items: start;
  }

  .page-about .about-index-card {
    margin-top: 12px;
  }

  .page-about .about-hero-stats {
    margin-top: 56px;
  }

  .page-about .about-result-band {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

  .page-about .about-next-band {
    grid-template-columns: minmax(0, 3fr) minmax(0, 9fr);
    gap: 32px;
    align-items: start;
  }

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

  .page-about .about-team-figure {
    margin-top: 6px;
  }
}

@media (min-width: 1024px) {
  .page-about .about-scope-aside {
    padding-left: 8px;
  }

  .page-about .about-method-figure {
    padding-right: 8px;
  }

  .page-about .about-entry-note {
    padding: 34px 34px 30px;
  }
}