.page-about {
  --about-pad: clamp(20px, 4vw, 46px);
  --about-line: rgba(37, 28, 24, 0.18);
  --about-line-dark: rgba(169, 181, 196, 0.22);
  background: var(--ink);
  color: var(--paper);
  padding-bottom: clamp(48px, 8vw, 96px);
}

/* 面包屑 */
.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding: 18px 0 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--mist);
}
.page-about .breadcrumb a {
  color: var(--mist);
  text-decoration: none;
}
.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  color: var(--cyan);
}
.page-about .breadcrumb [aria-current="page"] {
  color: var(--paper);
}

/* 通用小标题与编号 */
.page-about .eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--cyan);
}
.page-about .eyebrow--dark {
  color: var(--cyan-deep);
}
.page-about .idx {
  display: inline-block;
  padding: 2px 6px;
  background: var(--orange);
  color: var(--ink);
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 12px;
  letter-spacing: 0.05em;
}

/* 首屏 */
.page-about .about-hero {
  padding: 8px 0 clamp(30px, 5vw, 56px);
}
.page-about .about-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
}
.page-about h1 {
  margin: 0 0 18px;
  max-width: 16ch;
  font-family: var(--font-display);
  font-size: clamp(34px, 7.4vw, 64px);
  line-height: 1.02;
  letter-spacing: -0.015em;
  color: var(--paper);
  transform: skewX(-4deg);
  transform-origin: left bottom;
}
.page-about h1 em {
  font-style: normal;
  color: var(--orange);
}
.page-about .about-lede {
  margin: 0 0 26px;
  max-width: 58ch;
  font-size: clamp(15px, 1.9vw, 18px);
  line-height: 1.78;
  color: var(--mist);
}
.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* 首屏右侧数据浮层 */
.page-about .about-aside {
  padding: 22px 20px;
  background: var(--ink-2);
  border: 1px solid var(--about-line-dark);
  border-top: 3px solid var(--orange);
  border-radius: var(--radius);
}
.page-about .about-aside-title {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--mist);
}
.page-about .about-stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px 12px;
}
.page-about .about-stats li {
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding-left: 10px;
  border-left: 2px solid var(--cyan);
}
.page-about .about-stat-num {
  font-family: var(--font-mono);
  font-size: clamp(22px, 3.2vw, 28px);
  font-weight: 700;
  line-height: 1;
  color: var(--paper);
}
.page-about .about-stat-num .unit {
  margin-left: 2px;
  font-size: 0.55em;
  color: var(--cyan);
}
.page-about .about-stat-label {
  font-size: 12px;
  color: var(--mist);
}
.page-about .about-aside-foot {
  margin: 16px 0 0;
  padding-top: 12px;
  border-top: 1px solid var(--about-line-dark);
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--mist);
}

/* 首屏主图 */
.page-about .about-hero-figure {
  position: relative;
  margin: clamp(26px, 4vw, 44px) 0 0;
  overflow: hidden;
  border: 1px solid var(--line-strong);
}
.page-about .about-hero-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  filter: saturate(0.92) contrast(1.05);
}
.page-about .about-hero-figure::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    repeating-linear-gradient(90deg, rgba(14, 27, 44, 0.24) 0 1px, transparent 1px 84px),
    linear-gradient(180deg, rgba(14, 27, 44, 0) 42%, rgba(14, 27, 44, 0.88) 100%);
}
.page-about .about-hero-figure figcaption {
  position: absolute;
  left: 18px;
  bottom: 14px;
  z-index: 1;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cyan);
}

/* 主体：左侧章节索引 + 右侧堆叠画板 */
.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px;
  padding-top: clamp(10px, 2vw, 24px);
}
.page-about .about-index {
  border-top: 2px solid var(--orange);
  padding-top: 12px;
  min-width: 0;
}
.page-about .about-index-title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--mist);
}
.page-about .about-index ol {
  list-style: none;
  margin: 0;
  padding: 0 0 6px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: thin;
}
.page-about .about-index li {
  flex: 0 0 auto;
}
.page-about .about-index a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 10px;
  border: 1px solid var(--about-line-dark);
  font-family: var(--font-body);
  font-size: 12.5px;
  color: var(--mist);
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.18s ease, border-color 0.18s ease;
}
.page-about .about-index a:hover,
.page-about .about-index a:focus-visible {
  border-color: var(--cyan);
  color: var(--paper);
}
.page-about .about-index-num {
  font-family: var(--font-mono);
  font-size: 10.5px;
  color: var(--orange);
}

.page-about .about-panels {
  display: flex;
  flex-direction: column;
  gap: 22px;
  min-width: 0;
}
.page-about .about-panel {
  position: relative;
  padding: var(--about-pad);
  background: var(--cream);
  color: var(--brown);
  border-radius: var(--radius);
  box-shadow: 0 6px 0 rgba(0, 0, 0, 0.22);
}
.page-about .about-panel--dark {
  background: var(--ink-2);
  color: var(--paper);
  border: 1px solid var(--about-line-dark);
  border-left: 3px solid var(--cyan);
}
.page-about .about-panel--contact {
  background-color: var(--ink-3);
  background-image: repeating-linear-gradient(135deg, rgba(255, 90, 42, 0.07) 0 2px, transparent 2px 22px);
  color: var(--paper);
  border: 1px solid var(--about-line-dark);
  border-top: 3px solid var(--orange);
}
.page-about .about-panel h2 {
  margin: 0 0 14px;
  max-width: 24ch;
  font-family: var(--font-display);
  font-size: clamp(25px, 4.2vw, 38px);
  line-height: 1.08;
  letter-spacing: -0.01em;
}
.page-about .about-panel h3 {
  margin: 0 0 6px;
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 16.5px;
}
.page-about .about-panel p {
  margin: 0 0 12px;
  font-size: 15.5px;
  line-height: 1.75;
}
.page-about .about-panel p:last-child {
  margin-bottom: 0;
}
.page-about .about-panel--dark p,
.page-about .about-panel--contact p {
  color: var(--mist);
}

/* 四类服务 */
.page-about .about-services {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
}
.page-about .about-services li {
  display: grid;
  grid-template-columns: 38px minmax(0, 1fr);
  gap: 14px;
  padding: 18px 0;
  border-top: 1px solid var(--about-line);
}
.page-about .about-services li:last-child {
  border-bottom: 1px solid var(--about-line);
}
.page-about .about-services .idx {
  margin-top: 2px;
  text-align: center;
  align-self: start;
}
.page-about .about-services p {
  margin: 0;
  font-size: 14.5px;
}

/* 旁注 */
.page-about .about-note {
  margin-top: 22px;
  padding: 14px 16px;
  background: rgba(62, 240, 200, 0.1);
  border-left: 3px solid var(--cyan-deep);
}
.page-about .about-note-title {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--cyan-deep);
}
.page-about .about-note p:last-child {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
}

/* 时间线 */
.page-about .about-timeline-figure {
  margin: 18px 0 26px;
  overflow: hidden;
  border: 1px solid var(--about-line-dark);
}
.page-about .about-timeline-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}
.page-about .about-timeline {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0;
}
.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: linear-gradient(180deg, var(--orange), var(--cyan));
}
.page-about .about-timeline li {
  position: relative;
  padding: 0 0 26px 36px;
}
.page-about .about-timeline li:last-child {
  padding-bottom: 0;
}
.page-about .about-timeline li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 4px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--ink-2);
  border: 2px solid var(--cyan);
  transition: background 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}
.page-about .about-timeline li:hover::before {
  background: var(--orange);
  border-color: var(--orange);
  transform: scale(1.12);
}
.page-about .about-tl-year {
  display: inline-block;
  margin-bottom: 4px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--gold);
}
.page-about .about-timeline h3 {
  color: var(--paper);
  font-size: 16px;
}
.page-about .about-timeline p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.7;
}
.page-about .about-tl-key {
  display: inline-block;
  margin-top: 8px;
  padding: 3px 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--cyan);
  border: 1px solid rgba(62, 240, 200, 0.4);
  opacity: 0.65;
  transition: opacity 0.2s ease, background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}
.page-about .about-timeline li:hover .about-tl-key {
  opacity: 1;
  background: var(--cyan);
  border-color: var(--cyan);
  color: var(--ink);
}

/* 团队分工 */
.page-about .about-team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px;
  margin-top: 18px;
}
.page-about .about-team-figure {
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--about-line);
}
.page-about .about-team-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}
.page-about .filter-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 4px 0 14px;
}
.page-about .filter-btn {
  padding: 7px 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--brown);
  background: transparent;
  border: 1px solid rgba(37, 28, 24, 0.35);
  border-radius: var(--radius);
  cursor: pointer;
  transition: background 0.18s ease, color 0.18s ease, border-color 0.18s ease;
}
.page-about .filter-btn:hover,
.page-about .filter-btn:focus-visible {
  border-color: var(--orange);
  color: var(--orange-deep);
}
.page-about .filter-btn[aria-pressed="true"],
.page-about .filter-btn.is-active {
  background: var(--brown);
  border-color: var(--brown);
  color: var(--cream);
}
.page-about .filter-status {
  flex: 1 0 100%;
  margin: 2px 0 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: rgba(37, 28, 24, 0.62);
}
.page-about .about-roles {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}
.page-about .about-role {
  padding: 14px 16px;
  background: rgba(255, 255, 255, 0.55);
  border: 1px solid var(--about-line);
  border-left: 3px solid var(--orange);
}
.page-about .about-role h3 {
  display: flex;
  align-items: baseline;
  gap: 8px;
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 19px;
  letter-spacing: 0.01em;
}
.page-about .about-role-count {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 400;
  letter-spacing: 0.1em;
  color: var(--orange-deep);
}
.page-about .about-role p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.7;
}

/* 四步流程 */
.page-about .about-steps {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
}
.page-about .about-steps li {
  padding: 16px 0 0;
  border-top: 3px solid var(--brown);
}
.page-about .about-steps li:nth-child(1) {
  border-top-color: var(--orange);
}
.page-about .about-steps li:nth-child(2) {
  border-top-color: var(--gold);
}
.page-about .about-steps li:nth-child(3) {
  border-top-color: var(--cyan-deep);
}
.page-about .about-step-num {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  color: var(--orange-deep);
}
.page-about .about-steps h3 {
  font-size: 16px;
}
.page-about .about-steps p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
}
.page-about .about-cadence {
  margin-top: 26px;
  padding-top: 16px;
  border-top: 1px dashed rgba(37, 28, 24, 0.32);
}
.page-about .about-cadence-label {
  display: inline-block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--cyan-deep);
}
.page-about .about-cadence ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 8px;
}
.page-about .about-cadence li {
  position: relative;
  padding-left: 20px;
  font-size: 14.5px;
  line-height: 1.65;
}
.page-about .about-cadence li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 8px;
  height: 8px;
  background: var(--orange);
  transform: rotate(45deg);
}

/* 协作与检查 */
.page-about .about-checks {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}
.page-about .about-checks li {
  position: relative;
  padding-left: 26px;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--mist);
}
.page-about .about-checks li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 14px;
  height: 2px;
  background: var(--cyan);
}

/* 服务与联络 */
.page-about .about-contact-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 20px 0 16px;
}
.page-about .about-fineprint {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--mist);
}
.page-about .about-fineprint .link-inline {
  color: var(--cyan);
}

/* 平板及以上 */
@media (min-width: 720px) {
  .page-about .about-steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px 18px;
  }
}

@media (min-width: 820px) {
  .page-about .about-team-grid {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
    gap: 26px;
    align-items: start;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
    gap: clamp(28px, 4vw, 56px);
    align-items: start;
  }
}

/* 桌面：左侧粘性索引 + 堆叠错位面板 */
@media (min-width: 1000px) {
  .page-about .about-body {
    grid-template-columns: 190px minmax(0, 1fr);
    gap: clamp(28px, 4vw, 56px);
    align-items: start;
  }
  .page-about .about-index {
    position: sticky;
    top: 104px;
  }
  .page-about .about-index ol {
    flex-direction: column;
    gap: 2px;
    padding-bottom: 0;
    overflow: visible;
  }
  .page-about .about-index li {
    flex: 1 1 auto;
  }
  .page-about .about-index a {
    width: 100%;
    padding: 8px 0 8px 12px;
    border: 0;
    border-left: 2px solid transparent;
  }
  .page-about .about-index a:hover,
  .page-about .about-index a:focus-visible {
    border-left-color: var(--cyan);
  }
  .page-about .about-panel {
    box-shadow: 12px 12px 0 rgba(0, 0, 0, 0.28);
  }
  .page-about .about-panel + .about-panel {
    margin-top: -14px;
  }
  .page-about .about-panel:nth-child(even) {
    margin-left: clamp(0px, 2.4vw, 42px);
  }
  .page-about .about-panel:nth-child(odd) {
    margin-right: clamp(0px, 1.6vw, 26px);
  }
}

@media (min-width: 1100px) {
  .page-about .about-steps {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about h1 {
    transform: none;
  }
  .page-about .about-timeline li::before,
  .page-about .about-tl-key,
  .page-about .filter-btn,
  .page-about .about-index a {
    transition: none;
  }
  .page-about .about-timeline li:hover::before {
    transform: none;
  }
}
<<<END>>>