.page-about {
  --about-space: clamp(48px, 7vw, 96px);
  --about-gap: clamp(24px, 3.4vw, 48px);
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-sans);
  overflow-x: hidden;
}

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

.page-about .eyebrow {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--clay);
}

.page-about .about-eyebrow--light {
  color: var(--sand);
}

.page-about .about-lede {
  margin: 0;
  max-width: 52ch;
  font-size: clamp(15px, 1.5vw, 18px);
  line-height: 1.8;
  color: rgba(27, 42, 65, 0.82);
}

.page-about .about-lede--light {
  color: rgba(246, 241, 231, 0.78);
}

.page-about .about-caption {
  margin: 10px 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.03em;
  line-height: 1.7;
  color: rgba(27, 42, 65, 0.62);
  border-left: 2px solid var(--sand);
  padding-left: 10px;
}

/* ===== 报头 ===== */
.page-about .about-masthead {
  border-top: 3px solid var(--flame);
  padding-bottom: clamp(28px, 4vw, 52px);
  background:
    repeating-linear-gradient(90deg, var(--line-soft) 0 1px, transparent 1px 96px),
    var(--paper);
}

.page-about .crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding-top: 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--ink);
}

.page-about .crumbs a {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px solid var(--line);
}

.page-about .crumbs a:hover,
.page-about .crumbs a:focus-visible {
  color: var(--clay);
  border-bottom-color: var(--flame);
}

.page-about .crumbs-sep {
  color: var(--sage);
}

.page-about .about-hero-grid {
  display: grid;
  gap: 28px;
  padding-top: clamp(24px, 3.4vw, 44px);
}

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

.page-about .about-rail-list li {
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-rail-list a {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 8px 0;
  font-size: 13.5px;
  text-decoration: none;
  color: var(--ink);
  transition: color 0.16s ease, padding-left 0.16s ease;
}

.page-about .about-rail-list a:hover,
.page-about .about-rail-list a:focus-visible {
  color: var(--clay);
  padding-left: 6px;
}

.page-about .about-rail-num {
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 600;
  color: var(--flame);
}

.page-about .about-hero-body h1 {
  margin: 0 0 18px;
  font-family: var(--font-serif);
  font-weight: 900;
  font-size: clamp(29px, 5.2vw, 60px);
  line-height: 1.14;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.page-about .about-meta {
  list-style: none;
  margin: 26px 0 0;
  padding: 16px 0 0;
  border-top: 1px solid var(--ink);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px 20px;
}

.page-about .about-meta-k {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--sage);
}

.page-about .about-meta-v {
  display: block;
  margin-top: 4px;
  font-family: var(--font-mono);
  font-size: 17px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-hero-note {
  padding-top: 14px;
  border-top: 2px solid var(--ink);
  font-size: 13.5px;
  line-height: 1.8;
  color: rgba(27, 42, 65, 0.78);
}

.page-about .about-hero-note p {
  margin: 0;
}

.page-about .about-note-label {
  margin-bottom: 8px !important;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--flame);
}

.page-about .about-hero-media {
  margin: var(--about-gap) 0 0;
}

.page-about .about-hero-media img {
  width: 100%;
  object-fit: cover;
  border: 1px solid var(--line);
  background: var(--stone);
}

/* ===== 通用段落头 ===== */
.page-about .about-section {
  padding: var(--about-space) 0;
}

.page-about .about-head {
  padding-top: 18px;
  margin-bottom: clamp(24px, 3.4vw, 44px);
  border-top: 1px solid var(--ink);
  max-width: 64ch;
}

.page-about .about-head h2 {
  margin: 0 0 14px;
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: clamp(24px, 3.4vw, 40px);
  line-height: 1.22;
  letter-spacing: -0.01em;
}

.page-about .about-head--dark {
  border-top-color: rgba(246, 241, 231, 0.4);
}

.page-about .about-head--dark h2 {
  color: var(--paper);
}

/* ===== 01 起点 ===== */
.page-about .about-origin {
  background: var(--card);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .about-layout {
  display: grid;
  gap: var(--about-gap);
}

.page-about .about-layout-head h2 {
  margin: 0;
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: clamp(23px, 3.2vw, 36px);
  line-height: 1.24;
}

.page-about .about-layout-main p {
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.85;
  color: rgba(27, 42, 65, 0.86);
}

.page-about .about-square-list {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-square-list li {
  display: grid;
  grid-template-columns: 22px minmax(0, 1fr);
  gap: 0 14px;
  padding: 16px;
  background: var(--paper);
}

.page-about .about-square {
  width: 14px;
  height: 14px;
  margin-top: 4px;
  border: 2px solid var(--ink);
  position: relative;
  flex: none;
}

.page-about .about-square::after {
  content: "";
  position: absolute;
  left: 3px;
  top: -1px;
  width: 6px;
  height: 10px;
  border-right: 2px solid var(--flame);
  border-bottom: 2px solid var(--flame);
  transform: rotate(40deg);
}

.page-about .about-square-list h3 {
  margin: 0 0 4px;
  font-size: 15.5px;
  font-weight: 800;
}

.page-about .about-square-list p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(27, 42, 65, 0.74);
}

.page-about .about-layout-note {
  padding-top: 14px;
  border-top: 2px solid var(--sand);
  font-size: 13.5px;
  line-height: 1.8;
  color: rgba(27, 42, 65, 0.76);
}

.page-about .about-layout-note p {
  margin: 0 0 12px;
}

.page-about .about-note-figure {
  font-family: var(--font-mono);
  font-size: clamp(30px, 4vw, 42px);
  font-weight: 700;
  line-height: 1;
  color: var(--flame);
  letter-spacing: -0.02em;
  margin-top: 18px !important;
  margin-bottom: 4px !important;
}

.page-about .about-note-figure-cap {
  font-size: 12.5px;
  color: rgba(27, 42, 65, 0.62);
}

/* ===== 02 沿革 ===== */
.page-about .about-timeline-section {
  background: var(--ink);
  color: var(--paper);
}

.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 4px;
  border-left: 1px solid rgba(246, 241, 231, 0.24);
}

.page-about .about-tl-item {
  position: relative;
  padding: 0 0 clamp(24px, 3vw, 36px) clamp(22px, 3vw, 38px);
}

.page-about .about-tl-item::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 7px;
  width: 9px;
  height: 9px;
  background: var(--sand);
  transition: background 0.16s ease, transform 0.16s ease;
}

.page-about .about-tl-item:hover::before,
.page-about .about-tl-item:focus-within::before {
  background: var(--flame);
  transform: scale(1.4);
}

.page-about .about-tl-item:focus-visible {
  outline: 2px solid var(--flame);
  outline-offset: 8px;
}

.page-about .about-tl-year {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(17px, 1.9vw, 23px);
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--sand);
  margin-bottom: 6px;
}

.page-about .about-tl-body h3 {
  margin: 0 0 6px;
  font-size: clamp(16px, 1.7vw, 20px);
  font-weight: 800;
  color: var(--paper);
}

.page-about .about-tl-body p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: rgba(246, 241, 231, 0.76);
}

.page-about .about-tl-more {
  margin-top: 10px !important;
  padding-left: 12px;
  border-left: 2px solid var(--flame);
  font-size: 13px !important;
  color: rgba(246, 241, 231, 0.66) !important;
}

/* ===== 03 团队 ===== */
.page-about .about-team {
  background: var(--paper);
}

.page-about .about-team-grid {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-team-card {
  background: var(--card);
  padding: clamp(18px, 2.4vw, 30px);
  border-top: 3px solid var(--sage);
  transition: background 0.16s ease, transform 0.16s ease;
}

.page-about .about-team-card:nth-child(2) {
  border-top-color: var(--flame);
}

.page-about .about-team-card:nth-child(3) {
  border-top-color: var(--sand);
}

.page-about .about-team-card:hover,
.page-about .about-team-card:focus-visible {
  background: #fff;
  transform: translateY(-2px);
  outline: none;
}

.page-about .about-team-card:focus-visible {
  outline: 2px solid var(--flame);
  outline-offset: -2px;
}

.page-about .about-team-mark {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--clay);
}

.page-about .about-team-card h3 {
  margin: 0 0 8px;
  font-size: clamp(17px, 1.8vw, 20px);
  font-weight: 800;
}

.page-about .about-team-card p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: rgba(27, 42, 65, 0.8);
}

.page-about .about-team-more {
  margin-top: 12px !important;
  padding-top: 12px;
  border-top: 1px dashed var(--line);
  font-size: 13.5px !important;
  color: var(--clay) !important;
}

.page-about .about-team-figure {
  margin: clamp(28px, 4vw, 48px) 0 0;
}

.page-about .about-team-figure img {
  width: 100%;
  object-fit: cover;
  border: 1px solid var(--line);
  background: var(--stone);
}

/* ===== 04 方法 ===== */
.page-about .about-method {
  background: var(--mist);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .about-method-grid {
  display: grid;
  gap: var(--about-gap);
}

.page-about .about-method-text h2 {
  margin: 0 0 14px;
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: clamp(23px, 3.2vw, 36px);
  line-height: 1.24;
}

.page-about .about-method-text > .about-lede {
  margin-bottom: 26px;
}

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

.page-about .about-trail li {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  column-gap: 16px;
  row-gap: 2px;
  padding: 16px 0;
  border-top: 1px solid rgba(27, 42, 65, 0.22);
}

.page-about .about-trail li:last-child {
  border-bottom: 1px solid rgba(27, 42, 65, 0.22);
}

.page-about .about-trail-num {
  grid-row: 1 / span 2;
  padding-top: 2px;
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  color: var(--clay);
}

.page-about .about-trail li h3 {
  margin: 0;
  font-size: 16px;
  font-weight: 800;
  line-height: 1.5;
  color: var(--ink);
}

.page-about .about-trail li p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: rgba(27, 42, 65, 0.78);
}

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

.page-about .about-method-figure img {
  width: 100%;
  object-fit: cover;
  border: 1px solid rgba(27, 42, 65, 0.28);
  background: var(--card);
}

/* ===== 05 覆盖 ===== */
.page-about .about-reach {
  background: var(--paper);
}

.page-about .about-reach-grid {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-reach-stat {
  background: var(--card);
  padding: clamp(20px, 3vw, 34px);
}

.page-about .about-reach-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(32px, 4.6vw, 50px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--flame);
}

.page-about .about-reach-unit {
  display: block;
  margin-top: 8px;
  font-size: 13.5px;
  font-weight: 800;
  letter-spacing: 0.06em;
  color: var(--ink);
}

.page-about .about-reach-stat p {
  margin: 12px 0 0;
  font-size: 14px;
  line-height: 1.78;
  color: rgba(27, 42, 65, 0.76);
}

.page-about .about-partner-note {
  margin-top: clamp(24px, 3.4vw, 40px);
  padding-top: 18px;
  border-top: 1px solid var(--ink);
  display: grid;
  gap: 12px;
}

.page-about .about-partner-note h3 {
  margin: 0;
  font-size: clamp(17px, 1.9vw, 21px);
  font-weight: 800;
}

.page-about .about-partner-note p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(27, 42, 65, 0.8);
  max-width: 62ch;
}

/* ===== 06 原则与收束 ===== */
.page-about .about-principles {
  background: var(--stone);
  border-top: 1px solid var(--line);
}

.page-about .about-principles-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: rgba(27, 42, 65, 0.16);
  border: 1px solid rgba(27, 42, 65, 0.16);
}

.page-about .about-principles-list li {
  display: grid;
  grid-template-columns: 22px minmax(0, 1fr);
  gap: 0 14px;
  padding: clamp(16px, 2.4vw, 26px);
  background: var(--paper);
}

.page-about .about-check {
  width: 16px;
  height: 16px;
  margin-top: 3px;
  border: 2px solid var(--ink);
  position: relative;
}

.page-about .about-check::after {
  content: "";
  position: absolute;
  left: 3px;
  top: -1px;
  width: 6px;
  height: 10px;
  border-right: 2px solid var(--flame);
  border-bottom: 2px solid var(--flame);
  transform: rotate(40deg);
}

.page-about .about-principles-list h3 {
  margin: 0 0 5px;
  font-size: 16px;
  font-weight: 800;
}

.page-about .about-principles-list p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(27, 42, 65, 0.78);
}

.page-about .about-cta {
  margin-top: clamp(30px, 4.4vw, 54px);
  padding: clamp(24px, 3.4vw, 44px);
  background: var(--ink);
  border-left: 6px solid var(--flame);
  display: grid;
  gap: 22px;
}

.page-about .about-cta-kicker {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  color: var(--sand);
}

.page-about .about-cta-title {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(19px, 2.4vw, 27px);
  line-height: 1.42;
  color: var(--paper);
}

.page-about .about-cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-cta .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 24px;
  border-radius: 2px;
  font-family: var(--font-sans);
  font-size: 14.5px;
  font-weight: 800;
  letter-spacing: 0.02em;
  text-decoration: none;
  transition: background 0.16s ease, color 0.16s ease, border-color 0.16s ease;
}

.page-about .about-cta .btn--flame {
  background: var(--flame);
  color: var(--ink);
  border: 1px solid var(--flame);
}

.page-about .about-cta .btn--flame:hover,
.page-about .about-cta .btn--flame:focus-visible {
  background: var(--sand);
  border-color: var(--sand);
}

.page-about .about-cta .btn--ghost {
  background: transparent;
  color: var(--paper);
  border: 1px solid rgba(246, 241, 231, 0.55);
}

.page-about .about-cta .btn--ghost:hover,
.page-about .about-cta .btn--ghost:focus-visible {
  background: rgba(246, 241, 231, 0.12);
  border-color: var(--paper);
}

.page-about .about-cta .btn:focus-visible {
  outline: 2px solid var(--sand);
  outline-offset: 3px;
}

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

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

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

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

@media (min-width: 900px) {
  .page-about .about-layout {
    grid-template-columns: 220px minmax(0, 1fr);
    column-gap: clamp(28px, 3.6vw, 56px);
    align-items: start;
  }

  .page-about .about-layout-head {
    grid-column: 1;
  }

  .page-about .about-layout-main {
    grid-column: 2;
    grid-row: 1 / span 2;
  }

  .page-about .about-layout-note {
    grid-column: 1;
    grid-row: 2;
  }

  .page-about .about-method-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.66fr);
    column-gap: clamp(30px, 4vw, 60px);
  }

  .page-about .about-partner-note {
    grid-template-columns: 240px minmax(0, 1fr);
    column-gap: clamp(24px, 3vw, 44px);
    align-items: start;
  }

  .page-about .about-partner-note h3 {
    grid-row: 1 / span 2;
  }

  .page-about .about-partner-note p:last-child {
    grid-column: 2;
  }

  .page-about .about-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }

  /* 桌面端：悬停或聚焦时展开补充说明 */
  .page-about .about-tl-more,
  .page-about .about-team-more {
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    margin-top: 0 !important;
    padding-top: 0;
    transition: max-height 0.2s ease, opacity 0.2s ease, margin-top 0.2s ease, padding-top 0.2s ease;
  }

  .page-about .about-tl-item:hover .about-tl-more,
  .page-about .about-tl-item:focus-within .about-tl-more {
    max-height: 24em;
    opacity: 1;
    margin-top: 10px !important;
  }

  .page-about .about-team-card:hover .about-team-more,
  .page-about .about-team-card:focus-within .about-team-more {
    max-height: 24em;
    opacity: 1;
    margin-top: 12px !important;
    padding-top: 12px;
  }
}

@media (min-width: 1000px) {
  .page-about .about-hero-grid {
    grid-template-columns: 168px minmax(0, 1fr) 236px;
    column-gap: clamp(26px, 3vw, 52px);
    align-items: start;
  }

  .page-about .about-hero-rail {
    padding-top: 6px;
  }

  .page-about .about-hero-media img {
    max-height: 520px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition: none !important;
    animation: none !important;
  }
}
<<<END>>>