.page-about {
  --about-measure: 42em;
  background: var(--paper);
  color: var(--graphite);
  font-family: var(--font-sans);
}

/* ===== 首屏 ===== */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  background: var(--ink-green);
  color: var(--paper);
  border-bottom: var(--rule) solid var(--ink-deep);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    repeating-linear-gradient(90deg, rgba(227, 210, 176, 0.07) 0 1px, transparent 1px 88px),
    repeating-linear-gradient(0deg, rgba(227, 210, 176, 0.07) 0 1px, transparent 1px 88px);
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  padding-top: clamp(2.4rem, 6vw, 4.6rem);
  padding-bottom: clamp(2.2rem, 5vw, 4rem);
  max-width: 52rem;
}

.page-about .about-hero__kicker {
  margin: 0 0 1.2rem;
  font-size: 0.72rem;
  letter-spacing: 0.22em;
  color: var(--gold);
}

.page-about .about-hero h1 {
  margin: 0 0 1.2rem;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(2rem, 5.4vw, 3.6rem);
  line-height: 1.24;
  letter-spacing: 0.01em;
  color: var(--paper);
}

.page-about .about-hero__lede {
  margin: 0;
  max-width: 40em;
  font-size: clamp(0.98rem, 1.4vw, 1.1rem);
  line-height: 1.9;
  color: var(--gold-light);
}

/* ===== 主体骨架 ===== */
.page-about .about-body {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.2rem;
  padding-top: clamp(2rem, 4vw, 3.4rem);
  padding-bottom: clamp(2.6rem, 5vw, 4rem);
}

@media (min-width: 64rem) {
  .page-about .about-body {
    grid-template-columns: 13.5rem minmax(0, 1fr);
    gap: clamp(2rem, 4vw, 4rem);
    align-items: start;
  }
}

/* 左侧章节索引 */
.page-about .about-rail {
  border-top: var(--rule) solid var(--ink-green);
  padding-top: 0.9rem;
}

@media (min-width: 64rem) {
  .page-about .about-rail {
    position: sticky;
    top: 1.5rem;
    align-self: start;
  }
}

.page-about .rail-title {
  margin: 0 0 0.8rem;
  font-size: 0.68rem;
  letter-spacing: 0.22em;
  color: var(--slate);
}

.page-about .rail-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.3rem 1rem;
}

.page-about .rail-item {
  flex: 0 0 auto;
}

.page-about .rail-link {
  display: inline-flex;
  align-items: baseline;
  gap: 0.45rem;
  padding: 0.3rem 0.1rem;
  border-bottom: 2px solid transparent;
  color: var(--slate);
  font-size: 0.88rem;
  text-decoration: none;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), padding-left var(--dur) var(--ease);
}

.page-about .rail-link:hover,
.page-about .rail-link:focus-visible {
  color: var(--ink-green);
  border-bottom-color: var(--gold);
}

.page-about .rail-num {
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  color: var(--copper);
}

@media (min-width: 64rem) {
  .page-about .rail-list {
    display: block;
  }
  .page-about .rail-item {
    display: block;
  }
  .page-about .rail-link {
    display: flex;
    width: 100%;
    padding: 0.5rem 0.2rem;
    border-bottom: 1px solid rgba(110, 122, 115, 0.3);
  }
  .page-about .rail-link:hover,
  .page-about .rail-link:focus-visible {
    background: var(--mist);
    padding-left: 0.55rem;
  }
  .page-about .rail-label {
    margin-left: auto;
    font-size: 0.88rem;
  }
}

/* ===== 章节通用 ===== */
.page-about .about-section {
  margin-bottom: clamp(2.8rem, 6vw, 4.6rem);
  scroll-margin-top: 5rem;
}

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

.page-about .sec-head {
  display: flex;
  align-items: baseline;
  gap: 0.9rem;
  padding-bottom: 0.7rem;
  margin-bottom: 1.4rem;
  border-bottom: var(--rule) solid var(--ink-green);
}

.page-about .sec-num {
  flex: 0 0 auto;
  font-size: 0.78rem;
  letter-spacing: 0.18em;
  color: var(--copper);
}

.page-about .sec-head h2 {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(1.45rem, 3vw, 2.15rem);
  line-height: 1.32;
  color: var(--ink-green);
}

.page-about .sec-lede {
  margin: 0 0 1.8rem;
  max-width: var(--about-measure);
  line-height: 1.9;
  color: var(--graphite);
}

/* ===== 01 档案索引 ===== */
.page-about .fact-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  border-top: var(--rule) solid var(--ink-deep);
}

.page-about .fact {
  border-bottom: 1px solid rgba(110, 122, 115, 0.32);
}

.page-about .fact__link {
  display: block;
  padding: 1.1rem 0.9rem 1.1rem 0.2rem;
  text-decoration: none;
  color: inherit;
  transition: background var(--dur) var(--ease), padding-left var(--dur) var(--ease);
}

.page-about .fact__link:hover,
.page-about .fact__link:focus-visible {
  background: var(--mist);
  padding-left: 0.9rem;
}

.page-about .fact__head {
  display: flex;
  align-items: baseline;
  gap: 0.25rem;
  margin-bottom: 0.35rem;
}

.page-about .fact__value {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(1.9rem, 4.4vw, 2.6rem);
  line-height: 1.05;
  color: var(--ink-green);
}

.page-about .fact__unit {
  font-size: 0.9rem;
  color: var(--copper);
}

.page-about .fact__label {
  display: block;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--ink-green);
  margin-bottom: 0.2rem;
}

.page-about .fact__note {
  display: block;
  font-size: 0.83rem;
  line-height: 1.6;
  color: var(--slate);
}

@media (min-width: 40rem) {
  .page-about .fact-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .fact {
    padding-right: 1.2rem;
  }
}

@media (min-width: 68rem) {
  .page-about .fact-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ===== 02 时间轴 ===== */
.page-about .about-figure {
  margin: 0 0 2rem;
}

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

.page-about .timeline {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 17px;
  top: 12px;
  bottom: 14px;
  width: 2px;
  background: var(--gold-dim);
}

.page-about .tl-node {
  position: relative;
  padding-left: 2.3rem;
  padding-bottom: 1.55rem;
  max-width: 38rem;
}

.page-about .tl-node::before {
  content: "";
  position: absolute;
  left: 18px;
  top: 8px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  transform: translateX(-50%);
  background: var(--copper);
  transition: background var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .tl-node:hover::before {
  background: var(--gold);
  box-shadow: 0 0 0 4px rgba(201, 169, 110, 0.24);
}

.page-about .tl-year {
  margin: 0 0 0.25rem;
  font-size: 0.82rem;
  letter-spacing: 0.16em;
  color: var(--copper);
  transition: color var(--dur) var(--ease);
}

.page-about .tl-node:hover .tl-year {
  color: var(--ink-green);
}

.page-about .tl-title {
  margin: 0 0 0.35rem;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 1.12rem;
  line-height: 1.5;
  color: var(--ink-green);
}

.page-about .tl-text {
  margin: 0;
  font-size: 0.93rem;
  line-height: 1.85;
  color: var(--graphite);
}

/* ===== 03 业务板块 ===== */
.page-about .line-list {
  border-top: var(--rule) solid var(--ink-deep);
}

.page-about .biz-line {
  border-bottom: 1px solid rgba(110, 122, 115, 0.32);
  border-left: 4px solid transparent;
  padding: 1.35rem 0 1.35rem 1rem;
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .biz-line:hover {
  border-left-color: var(--gold);
  background: var(--mist);
}

.page-about .biz-code {
  margin: 0 0 0.4rem;
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  color: var(--slate);
}

.page-about .biz-title {
  margin: 0 0 0.5rem;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 1.22rem;
  color: var(--ink-green);
}

.page-about .biz-text {
  margin: 0 0 0.6rem;
  max-width: var(--about-measure);
  line-height: 1.88;
}

.page-about .biz-meta {
  margin: 0;
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--copper);
}

.page-about .cross-note {
  margin-top: 1.8rem;
  padding: clamp(1.2rem, 3vw, 2rem);
  background: var(--ink-green);
  color: var(--paper);
  border-left: 6px solid var(--gold);
}

.page-about .cross-note h3 {
  margin: 0 0 0.6rem;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 1.1rem;
  color: var(--gold-light);
}

.page-about .cross-note p {
  margin: 0;
  max-width: 46em;
  line-height: 1.9;
  font-size: 0.95rem;
}

/* ===== 04 团队与交付 ===== */
.page-about .bar-chart {
  display: grid;
  gap: 0.75rem;
  margin: 1.6rem 0 0.9rem;
}

.page-about .bar-row {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 0.35rem 0.7rem;
}

.page-about .bar-key {
  font-size: 0.88rem;
  color: var(--graphite);
}

.page-about .bar-track {
  grid-column: 1 / -1;
  display: block;
  height: 14px;
  background: var(--mist);
  border: 1px solid rgba(110, 122, 115, 0.45);
}

.page-about .bar-fill {
  display: block;
  height: 100%;
}

.page-about .bar-fill--a { width: 40%; background: var(--ink-green); }
.page-about .bar-fill--b { width: 25%; background: var(--copper); }
.page-about .bar-fill--c { width: 20%; background: var(--slate); }
.page-about .bar-fill--d { width: 15%; background: var(--gold); }

.page-about .bar-val {
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  color: var(--ink-green);
  text-align: right;
}

.page-about .bar-note {
  margin: 0 0 2rem;
  max-width: var(--about-measure);
  font-size: 0.85rem;
  line-height: 1.8;
  color: var(--slate);
}

@media (min-width: 44rem) {
  .page-about .bar-row {
    grid-template-columns: 9.5rem minmax(0, 1fr) 4.5rem;
  }
  .page-about .bar-track {
    grid-column: auto;
  }
}

.page-about .deliver-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1.3rem;
}

.page-about .deliver-item {
  display: flex;
  gap: 0.9rem;
  border-top: var(--rule) solid var(--ink-green);
  padding-top: 0.85rem;
}

.page-about .deliver-num {
  flex: 0 0 auto;
  font-size: 0.74rem;
  letter-spacing: 0.16em;
  color: var(--copper);
  padding-top: 0.3rem;
}

.page-about .deliver-item h3 {
  margin: 0 0 0.4rem;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 1.05rem;
  color: var(--ink-green);
}

.page-about .deliver-item p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.85;
}

@media (min-width: 52rem) {
  .page-about .deliver-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.5rem 2.2rem;
  }
}

/* ===== 05 服务网络 ===== */
.page-about .net-visual {
  position: relative;
  margin-bottom: 1.8rem;
  border: var(--rule) solid var(--ink-deep);
  box-shadow: var(--shadow-md);
  background: var(--ink-deep);
  overflow: hidden;
}

.page-about .net-visual img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  opacity: 0.42;
}

.page-about .net-map {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.page-about .net-nodes circle {
  transition: r var(--dur) var(--ease);
}

.page-about .net-visual:hover .net-nodes circle {
  r: 8;
}

.page-about .net-facts {
  margin: 0;
  display: grid;
  grid-template-columns: 1fr;
  border-top: var(--rule) solid var(--ink-deep);
}

.page-about .net-fact {
  display: grid;
  grid-template-columns: 7rem minmax(0, 1fr);
  gap: 0.4rem 1rem;
  align-items: baseline;
  padding: 0.95rem 0;
  border-bottom: 1px solid rgba(110, 122, 115, 0.32);
}

.page-about .net-fact dt {
  margin: 0;
  font-family: var(--font-serif);
  color: var(--ink-green);
  line-height: 1.2;
}

.page-about .net-value {
  font-weight: 700;
  font-size: clamp(1.5rem, 3.4vw, 1.9rem);
}

.page-about .net-unit {
  display: block;
  margin-top: 0.2rem;
  font-family: var(--font-sans);
  font-size: 0.76rem;
  color: var(--copper);
}

.page-about .net-fact dd {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.78;
  color: var(--graphite);
}

@media (min-width: 52rem) {
  .page-about .net-facts {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 2.6rem;
  }
}

/* ===== 06 资质与协作 ===== */
.page-about .trust-list {
  display: grid;
  gap: 0.85rem;
  margin-bottom: 2rem;
}

.page-about .trust-item {
  border: var(--rule) solid var(--ink-deep);
  background: var(--mist);
  box-shadow: var(--shadow-sm);
}

.page-about .trust-item summary {
  display: flex;
  align-items: baseline;
  gap: 0.8rem;
  padding: 0.95rem 1.1rem;
  cursor: pointer;
  font-weight: 500;
  color: var(--ink-green);
  list-style: none;
}

.page-about .trust-item summary::-webkit-details-marker {
  display: none;
}

.page-about .trust-item summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  color: var(--copper);
}

.page-about .trust-item[open] summary::after {
  content: "−";
}

.page-about .trust-code {
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  color: var(--copper);
}

.page-about .trust-item p {
  margin: 0;
  padding: 0.9rem 1.1rem 1.1rem;
  border-top: 1px solid rgba(110, 122, 115, 0.38);
  font-size: 0.92rem;
  line-height: 1.88;
}

.page-about .partner-block {
  display: grid;
  gap: 1.3rem;
}

.page-about .partner-item {
  border-left: 6px solid var(--gold);
  padding: 0.2rem 0 0.2rem 1rem;
}

.page-about .partner-item h3 {
  margin: 0 0 0.45rem;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 1.08rem;
  color: var(--ink-green);
}

.page-about .partner-item p {
  margin: 0;
  max-width: 36em;
  font-size: 0.92rem;
  line-height: 1.85;
}

@media (min-width: 52rem) {
  .page-about .partner-block {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.6rem 2.4rem;
  }
}

/* ===== 07 服务做法与出口 ===== */
.page-about .practice-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1.5rem;
}

.page-about .practice-item {
  display: flex;
  gap: 1rem;
}

.page-about .practice-no {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 1.35rem;
  line-height: 1;
  color: var(--gold);
}

.page-about .practice-item h3 {
  margin: 0 0 0.4rem;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 1.08rem;
  color: var(--ink-green);
}

.page-about .practice-item p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.85;
}

@media (min-width: 56rem) {
  .page-about .practice-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.9rem 2.6rem;
  }
}

.page-about .about-cta {
  margin-top: clamp(2.4rem, 5vw, 3.6rem);
  padding: clamp(1.4rem, 4vw, 2.4rem);
  display: grid;
  gap: 1.5rem;
  background: var(--mist);
  border: var(--rule) solid var(--ink-deep);
  box-shadow: var(--shadow-md);
}

.page-about .about-cta__kicker {
  margin: 0 0 0.7rem;
  font-size: 0.7rem;
  letter-spacing: 0.22em;
  color: var(--copper);
}

.page-about .about-cta h2 {
  margin: 0 0 0.7rem;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(1.3rem, 3vw, 1.8rem);
  line-height: 1.35;
  color: var(--ink-green);
}

.page-about .about-cta p {
  margin: 0;
  max-width: 40em;
  line-height: 1.88;
  font-size: 0.94rem;
}

.page-about .about-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  align-content: start;
}

@media (min-width: 56rem) {
  .page-about .about-cta {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
    align-items: center;
    gap: 2.4rem;
  }
  .page-about .about-cta__links {
    flex-direction: column;
    align-items: stretch;
  }
}
<<<END>>>