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

.page-about .about-cover {
  padding-block: clamp(20px, 3vw, 40px) clamp(32px, 5vw, 64px);
}

.page-about .about-cover-grid {
  display: grid;
  gap: clamp(22px, 3vw, 44px);
}

/* ---------- 章节索引窄栏 ---------- */
.page-about .about-index {
  border-left: 2px solid var(--qing);
  padding-left: 14px;
}

.page-about .about-index-title {
  margin: 0 0 12px;
  font-size: var(--fs-micro);
  letter-spacing: 0.16em;
  color: var(--stone);
  font-weight: 700;
}

.page-about .about-index-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
}

.page-about .about-index-link {
  display: flex;
  gap: 10px;
  align-items: baseline;
  padding: 8px 2px;
  font-size: var(--fs-small);
  color: var(--ink);
  text-decoration: none;
  border-bottom: var(--line-soft);
  transition: color 0.18s ease, padding-left 0.18s ease;
}

.page-about .about-index-link .mono {
  font-family: var(--mono);
  font-size: var(--fs-micro);
  color: var(--amber-deep);
  letter-spacing: 0.06em;
}

.page-about .about-index-link:hover,
.page-about .about-index-link:focus-visible {
  color: var(--qing);
  padding-left: 6px;
}

.page-about .about-index-stamp {
  margin: 18px 0 0;
  font-size: var(--fs-micro);
  color: var(--stone);
  display: flex;
  align-items: center;
  gap: 8px;
}

.page-about .about-index-stamp .mono {
  font-family: var(--mono);
  color: var(--qing-deep);
  background: var(--amber);
  padding: 2px 7px;
  font-weight: 700;
  letter-spacing: 0.04em;
}

/* ---------- 封面主区 ---------- */
.page-about .about-title {
  margin: 8px 0 18px;
  font-family: var(--sans);
  font-weight: 900;
  font-size: clamp(1.85rem, 6.2vw, 3.5rem);
  line-height: 1.1;
  letter-spacing: -0.025em;
  color: var(--ink);
}

.page-about .about-cover-main .lede {
  max-width: 70ch;
  font-size: var(--fs-body);
  line-height: 1.8;
  color: var(--ink);
  margin: 0;
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  margin-top: clamp(22px, 3vw, 32px);
  background: rgba(31, 92, 90, 0.2);
  border: 1px solid rgba(31, 92, 90, 0.2);
}

.page-about .about-stat {
  background: var(--white);
  padding: clamp(12px, 2vw, 18px) clamp(10px, 1.4vw, 16px);
  min-width: 0;
}

.page-about .about-stat-num {
  display: block;
  font-family: var(--mono);
  font-size: clamp(1.3rem, 4.4vw, 1.95rem);
  font-weight: 700;
  line-height: 1;
  color: var(--qing);
  letter-spacing: -0.02em;
}

.page-about .about-stat-label {
  display: block;
  margin-top: 9px;
  font-size: var(--fs-micro);
  line-height: 1.5;
  color: var(--stone);
}

.page-about .about-paths {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: clamp(20px, 3vw, 28px);
}

/* ---------- 横向切片 ---------- */
.page-about .about-slice {
  margin: clamp(26px, 4vw, 44px) 0 0;
}

.page-about .about-slice .media-frame {
  border: var(--line);
  box-shadow: var(--shadow);
}

.page-about .about-slice figcaption,
.page-about .about-method-figure figcaption {
  margin-top: 10px;
  font-size: var(--fs-micro);
  color: var(--stone);
  line-height: 1.6;
}

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

/* ---------- 章节骨架 ---------- */
.page-about .about-chapter {
  padding-block: clamp(26px, 4.5vw, 56px);
  scroll-margin-top: calc(var(--topbar-h) + 24px);
}

.page-about .about-chapter-grid {
  display: grid;
  gap: clamp(14px, 2.4vw, 34px);
}

.page-about .about-rail {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding-bottom: 6px;
  border-bottom: var(--line);
}

.page-about .about-rail--light {
  border-bottom-color: rgba(31, 92, 90, 0.16);
}

.page-about .about-num {
  font-family: var(--mono);
  font-size: clamp(1.5rem, 3.4vw, 2.2rem);
  font-weight: 700;
  line-height: 1;
  color: var(--qing);
  letter-spacing: -0.03em;
}

.page-about .about-rail-label {
  font-size: var(--fs-small);
  letter-spacing: 0.14em;
  color: var(--stone);
  font-weight: 700;
}

.page-about .about-chapter-body {
  min-width: 0;
}

.page-about .about-panel {
  position: relative;
  background: var(--white);
  border: var(--line);
  box-shadow: var(--shadow);
  padding: clamp(20px, 3.2vw, 40px);
}

.page-about .about-panel::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 46px;
  height: 3px;
  background: var(--amber);
}

.page-about .about-panel--tint {
  background: var(--silver);
  border-color: rgba(31, 92, 90, 0.24);
}

.page-about .about-panel--deep {
  background: var(--qing-deep);
  border-color: rgba(227, 168, 87, 0.4);
  color: var(--silver);
}

.page-about .about-panel--deep::before {
  background: var(--cinnabar);
  width: 62px;
}

.page-about .about-panel--deep .section-title {
  color: var(--white);
}

.page-about .about-panel .section-title {
  margin: 0 0 14px;
  font-family: var(--sans);
  font-weight: 900;
  font-size: clamp(1.3rem, 3.6vw, 1.9rem);
  line-height: 1.25;
  letter-spacing: -0.015em;
  color: var(--ink);
  max-width: 22ch;
}

.page-about .about-intro {
  margin: 0 0 clamp(18px, 2.6vw, 26px);
  max-width: 68ch;
  font-size: var(--fs-body);
  line-height: 1.8;
  color: var(--ink);
}

.page-about .about-intro--light {
  color: rgba(220, 230, 228, 0.86);
}

.page-about .about-sub-title {
  margin: clamp(24px, 3vw, 34px) 0 12px;
  font-family: var(--sans);
  font-weight: 900;
  font-size: clamp(1.05rem, 2.4vw, 1.3rem);
  letter-spacing: -0.01em;
  color: var(--qing-deep);
}

/* ---------- 沿革时间线 ---------- */
.page-about .about-timeline-figure {
  border: var(--line);
  margin-bottom: clamp(20px, 3vw, 30px);
}

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

.page-about .about-node {
  position: relative;
  margin-left: 6px;
  padding: 0 0 clamp(16px, 2.4vw, 24px) clamp(18px, 2.4vw, 26px);
  border-left: 1px solid rgba(31, 92, 90, 0.26);
}

.page-about .about-node:last-child {
  padding-bottom: 0;
  border-left-color: transparent;
}

.page-about .about-node::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 9px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--amber);
  box-shadow: 0 0 0 3px var(--white);
}

.page-about .about-node-year {
  display: inline-block;
  font-family: var(--mono);
  font-size: var(--fs-micro);
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--qing-deep);
  background: var(--silver);
  padding: 2px 8px;
  margin-bottom: 8px;
}

.page-about .about-node-title {
  margin: 0 0 10px;
  font-family: var(--sans);
  font-weight: 900;
  font-size: clamp(1rem, 2.4vw, 1.16rem);
  line-height: 1.4;
  color: var(--ink);
}

/* ---------- 折叠组（共享结构，仅调整本页节奏） ---------- */
.page-about .collapse {
  border-top: var(--line-soft);
}

.page-about .collapse-trigger {
  font-family: var(--sans);
  font-size: var(--fs-small);
  letter-spacing: 0.02em;
}

.page-about .collapse-body p {
  margin: 0;
  font-size: var(--fs-small);
  line-height: 1.85;
  color: var(--ink);
}

.page-about .about-panel--deep .collapse {
  border-top-color: rgba(220, 230, 228, 0.2);
}

/* ---------- 团队分工 ---------- */
.page-about .about-roles {
  list-style: none;
  margin: 0 0 clamp(18px, 2.6vw, 26px);
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-role {
  background: var(--white);
  border: var(--line);
  border-top: 3px solid var(--qing);
  padding: clamp(16px, 2.4vw, 24px);
  box-shadow: 0 1px 2px rgba(16, 42, 41, 0.04);
}

.page-about .about-role:nth-child(2) {
  border-top-color: var(--amber);
}

.page-about .about-role:nth-child(3) {
  border-top-color: var(--indigo);
}

.page-about .about-role-num {
  display: block;
  font-family: var(--mono);
  font-size: clamp(1.5rem, 3.6vw, 2rem);
  font-weight: 700;
  line-height: 1;
  color: var(--qing);
  letter-spacing: -0.02em;
}

.page-about .about-role:nth-child(2) .about-role-num {
  color: var(--amber-deep);
}

.page-about .about-role:nth-child(3) .about-role-num {
  color: var(--indigo);
}

.page-about .about-role-title {
  margin: 10px 0 8px;
  font-family: var(--sans);
  font-weight: 900;
  font-size: var(--fs-body);
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .about-role p {
  margin: 0;
  font-size: var(--fs-small);
  line-height: 1.8;
  color: rgba(16, 42, 41, 0.86);
}

.page-about .about-note {
  margin: 0;
  font-size: var(--fs-small);
  line-height: 1.8;
  color: var(--stone);
  border-top: var(--line-soft);
  padding-top: 14px;
}

.page-about .about-note a {
  color: var(--qing);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 评测方法 ---------- */
.page-about .about-method-grid {
  display: grid;
  gap: clamp(18px, 2.6vw, 30px);
  margin-bottom: clamp(20px, 3vw, 30px);
}

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

.page-about .about-method-figure .media-frame {
  border: var(--line);
}

.page-about .about-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: rgba(31, 92, 90, 0.16);
  border: 1px solid rgba(31, 92, 90, 0.16);
}

.page-about .about-step {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 10px;
  background: var(--white);
  padding: 14px 14px 16px;
}

.page-about .about-step-num {
  font-family: var(--mono);
  font-size: var(--fs-micro);
  font-weight: 700;
  color: var(--amber-deep);
  letter-spacing: 0.06em;
  padding-top: 3px;
}

.page-about .about-step-body h3 {
  margin: 0 0 6px;
  font-family: var(--sans);
  font-weight: 900;
  font-size: var(--fs-small);
  letter-spacing: 0.02em;
  color: var(--qing-deep);
}

.page-about .about-step-body p {
  margin: 0;
  font-size: var(--fs-small);
  line-height: 1.8;
  color: rgba(16, 42, 41, 0.86);
}

.page-about .about-principles {
  border: var(--line);
  background: var(--paper);
  padding: 0 clamp(12px, 2vw, 20px) 4px;
}

/* ---------- 合作与荣誉 ---------- */
.page-about .about-partner-tags {
  list-style: none;
  margin: 0 0 clamp(20px, 3vw, 28px);
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .about-honor {
  border-top: 1px solid rgba(220, 230, 228, 0.22);
  padding-top: 16px;
  margin-bottom: clamp(20px, 3vw, 28px);
}

.page-about .about-honor-label {
  margin: 0 0 10px;
  font-size: var(--fs-micro);
  letter-spacing: 0.16em;
  color: var(--amber);
  font-weight: 700;
}

.page-about .about-honor-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 9px;
}

.page-about .about-honor-list li {
  position: relative;
  padding-left: 16px;
  font-size: var(--fs-small);
  line-height: 1.75;
  color: rgba(220, 230, 228, 0.92);
}

.page-about .about-honor-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 7px;
  height: 2px;
  background: var(--cinnabar);
}

.page-about .about-figures {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: rgba(220, 230, 228, 0.24);
  border: 1px solid rgba(220, 230, 228, 0.24);
}

.page-about .about-figure {
  background: var(--qing-deep);
  padding: 14px 12px;
  min-width: 0;
}

.page-about .about-figure-num {
  display: block;
  font-family: var(--mono);
  font-size: clamp(1.15rem, 3.4vw, 1.6rem);
  font-weight: 700;
  line-height: 1;
  color: var(--amber);
  letter-spacing: -0.02em;
}

.page-about .about-figure-label {
  display: block;
  margin-top: 8px;
  font-size: var(--fs-micro);
  line-height: 1.5;
  color: rgba(220, 230, 228, 0.82);
}

/* ---------- 服务与联络 ---------- */
.page-about .about-cta-grid {
  display: grid;
  gap: 12px;
  margin-bottom: clamp(18px, 2.6vw, 26px);
}

.page-about .about-cta {
  display: block;
  text-decoration: none;
  color: var(--ink);
  background: var(--paper);
  border: var(--line);
  border-left: 3px solid var(--qing);
  padding: 16px 16px 18px;
  transition: transform 0.18s ease, border-color 0.18s ease, box-shadow 0.18s ease;
}

.page-about .about-cta:hover,
.page-about .about-cta:focus-visible {
  transform: translateY(-2px);
  border-color: rgba(31, 92, 90, 0.42);
  border-left-color: var(--cinnabar);
  box-shadow: var(--shadow);
}

.page-about .about-cta-kicker {
  display: block;
  font-family: var(--mono);
  font-size: var(--fs-micro);
  letter-spacing: 0.16em;
  color: var(--amber-deep);
  margin-bottom: 8px;
}

.page-about .about-cta-title {
  display: block;
  font-family: var(--sans);
  font-weight: 900;
  font-size: var(--fs-body);
  letter-spacing: -0.01em;
  margin-bottom: 6px;
}

.page-about .about-cta-desc {
  display: block;
  font-size: var(--fs-small);
  line-height: 1.7;
  color: var(--stone);
}

.page-about .about-inline-link {
  margin: clamp(18px, 2.6vw, 26px) 0 0;
}

/* ---------- 断点 ---------- */
@media (min-width: 640px) {
  .page-about .about-roles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .about-cta-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .about-figures {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 860px) {
  .page-about .about-cover-grid {
    grid-template-columns: 208px minmax(0, 1fr);
    align-items: start;
  }
  .page-about .about-index {
    position: sticky;
    top: calc(var(--topbar-h) + 24px);
  }
  .page-about .about-chapter-grid {
    grid-template-columns: 168px minmax(0, 1fr);
    align-items: start;
  }
  .page-about .about-rail {
    position: sticky;
    top: calc(var(--topbar-h) + 24px);
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
    border-bottom: none;
    border-left: 1px solid rgba(31, 92, 90, 0.24);
    padding: 0 0 0 14px;
  }
  .page-about .about-roles {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .about-method-grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: start;
  }
  .page-about .about-panel .section-title {
    font-size: clamp(1.5rem, 2.4vw, 2.05rem);
  }
}

@media (min-width: 1100px) {
  .page-about .about-cover-grid {
    grid-template-columns: 224px minmax(0, 1fr);
    gap: 52px;
  }
  .page-about .about-chapter-grid {
    grid-template-columns: 184px minmax(0, 1fr);
    gap: 44px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-cta,
  .page-about .about-index-link {
    transition: none;
  }
  .page-about .about-cta:hover,
  .page-about .about-cta:focus-visible {
    transform: none;
  }
}
<<<END>>>