.page-about {
  --about-line: 2px solid var(--ink);
  --about-shadow-sm: 3px 3px 0 var(--ink);
  --about-rail-w: 152px;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-sans);
}

.page-about .about-crumbs {
  padding-top: 16px;
  padding-bottom: 4px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: 14px 0 44px;
  overflow: hidden;
}

.page-about .about-hero::before,
.page-about .about-hero::after {
  content: "";
  position: absolute;
  border-radius: 50%;
  pointer-events: none;
}

.page-about .about-hero::before {
  width: 300px;
  height: 300px;
  top: -100px;
  right: -120px;
  border: 2px solid var(--ochre);
  opacity: 0.18;
}

.page-about .about-hero::after {
  width: 176px;
  height: 176px;
  top: 108px;
  right: -58px;
  border: 2px dashed var(--loess);
  opacity: 0.55;
}

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

.page-about .about-hero h1 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(30px, 7.4vw, 58px);
  line-height: 1.16;
  letter-spacing: -0.01em;
  margin: 10px 0 20px;
}

.page-about .hl {
  background: var(--loess);
  box-shadow: 0 0 0 5px var(--loess);
  padding: 0 1px;
}

.page-about .about-lead {
  font-size: 16px;
  line-height: 1.85;
  max-width: 34em;
  margin: 0;
  border-left: 3px solid var(--ochre);
  padding-left: 14px;
}

.page-about .hero-marks {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 26px;
}

.page-about .hero-mark {
  flex: 1 1 108px;
  border: var(--about-line);
  box-shadow: var(--about-shadow-sm);
  background: var(--paper);
  padding: 10px 12px;
}

.page-about .mark-num {
  display: block;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 26px;
  line-height: 1.1;
  color: var(--ochre-deep);
}

.page-about .mark-label {
  display: block;
  margin-top: 4px;
  font-size: 12px;
  letter-spacing: 0.04em;
  opacity: 0.78;
}

.page-about .about-hero-figure {
  margin: 34px 0 0;
  border: var(--about-line);
  background: var(--sand);
  box-shadow: var(--shadow-hard);
  transform: rotate(-1.2deg);
}

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

.page-about .about-hero-figure .media-caption {
  display: block;
  padding: 8px 12px;
  font-size: 12px;
  border-top: 2px solid var(--ink);
  background: var(--paper);
}

/* ---------- 正文双列 ---------- */
.page-about .about-body {
  padding-bottom: 48px;
}

.page-about .chapter-rail {
  display: none;
}

.page-about .chapter {
  padding: 40px 0;
  border-top: 2px solid var(--ink);
}

.page-about .about-flow > .chapter:first-child {
  border-top: none;
  padding-top: 8px;
}

.page-about .chapter-inner {
  position: relative;
}

.page-about .chapter-title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(24px, 4.6vw, 38px);
  line-height: 1.25;
  margin: 6px 0 18px;
}

.page-about .chapter p {
  font-size: 15.5px;
  line-height: 1.85;
  margin: 0 0 14px;
  max-width: 38em;
}

/* ---------- 三层路径 ---------- */
.page-about .path-strip {
  display: grid;
  gap: 12px;
  margin-top: 26px;
}

.page-about .path-step {
  position: relative;
  border: var(--about-line);
  background: var(--sand);
  box-shadow: var(--shadow-mid);
  padding: 16px 16px 18px;
  border-left: 8px solid var(--ochre);
}

.page-about .path-num {
  display: block;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--teal);
}

.page-about .path-name {
  display: block;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 20px;
  margin: 4px 0 8px;
}

.page-about .path-text {
  font-size: 14px;
  line-height: 1.75;
  margin: 0;
  max-width: none;
}

/* ---------- 三条原则 ---------- */
.page-about .chapter--method .chapter-inner {
  background: var(--sand);
  border: var(--about-line);
  box-shadow: var(--shadow-hard);
  padding: 26px 20px 30px;
}

.page-about .principle-grid {
  display: grid;
  gap: 14px;
  margin-top: 24px;
}

.page-about .principle {
  background: var(--paper);
  border: var(--about-line);
  box-shadow: var(--about-shadow-sm);
  padding: 16px 16px 18px;
}

.page-about .principle-no {
  display: inline-block;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 24px;
  line-height: 1;
  color: var(--paper);
  background: var(--ochre);
  padding: 6px 9px;
  border: 2px solid var(--ink);
}

.page-about .principle-name {
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: 17px;
  margin: 12px 0 8px;
  letter-spacing: 0.01em;
}

.page-about .principle-text {
  font-size: 14px;
  line-height: 1.78;
  margin: 0;
  max-width: none;
}

/* ---------- 时间轴 ---------- */
.page-about .chapter--timeline .chapter-inner {
  background: var(--ink);
  color: var(--paper);
  padding: 28px 20px 32px;
  border: var(--about-line);
  box-shadow: var(--shadow-hard);
}

.page-about .chapter--timeline .eyebrow {
  color: var(--signal);
}

.page-about .chapter--timeline .chapter-title {
  color: var(--paper);
}

.page-about .chapter--timeline p {
  color: rgba(250, 244, 232, 0.82);
}

.page-about .track-wrap {
  position: relative;
  margin-top: 26px;
}

.page-about .track-line {
  display: none;
}

.page-about .track {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
  position: relative;
  z-index: 1;
}

.page-about .track-stop {
  position: relative;
  border: 2px solid rgba(250, 244, 232, 0.26);
  background: rgba(250, 244, 232, 0.04);
  padding: 14px 14px 16px;
}

.page-about .track-stop:focus-visible {
  outline: 3px solid var(--signal);
  outline-offset: 2px;
}

.page-about .stop-year {
  display: inline-block;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 24px;
  line-height: 1;
  color: var(--signal);
  letter-spacing: 0.02em;
}

.page-about .stop-dot {
  display: inline-block;
  width: 11px;
  height: 11px;
  margin-left: 10px;
  border-radius: 50%;
  background: var(--ochre);
  border: 2px solid var(--paper);
  vertical-align: middle;
}

.page-about .stop-title {
  display: block;
  margin-top: 8px;
  font-weight: 700;
  font-size: 15px;
  color: var(--paper);
}

.page-about .stop-note {
  margin: 8px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: rgba(250, 244, 232, 0.78);
  max-width: none;
}

/* ---------- 维护团队 ---------- */
.page-about .team-grid {
  display: grid;
  gap: 12px;
  margin: 24px 0 26px;
}

.page-about .team-card {
  border: var(--about-line);
  background: var(--sand);
  box-shadow: var(--about-shadow-sm);
  padding: 14px 16px 16px;
}

.page-about .team-count {
  display: inline-block;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 30px;
  line-height: 1;
  color: var(--ochre-deep);
}

.page-about .team-role {
  display: inline-block;
  margin-left: 8px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--teal-deep);
  background: var(--teal-soft);
  padding: 3px 8px;
  border: 2px solid var(--ink);
}

.page-about .team-text {
  margin: 10px 0 0;
  font-size: 13.5px;
  line-height: 1.75;
  max-width: none;
}

.page-about .team-figure {
  margin: 0 0 22px;
  border: var(--about-line);
  box-shadow: var(--shadow-mid);
  background: var(--paper);
}

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

.page-about .team-figure .media-caption {
  display: block;
  padding: 8px 12px;
  font-size: 12px;
  border-top: 2px solid var(--ink);
  background: var(--loess);
  color: var(--ink);
}

.page-about .rhythm-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 2px dashed rgba(36, 30, 24, 0.4);
}

.page-about .rhythm-list li {
  padding: 12px 0;
  border-bottom: 2px dashed rgba(36, 30, 24, 0.4);
  font-size: 14.5px;
  line-height: 1.75;
}

.page-about .rhythm-list strong {
  display: inline-block;
  min-width: 3.4em;
  font-weight: 900;
  color: var(--ochre);
  letter-spacing: 0.04em;
}

/* ---------- 场景清单 ---------- */
.page-about .chapter--who .chapter-inner {
  background: var(--sand);
  border: var(--about-line);
  box-shadow: var(--shadow-hard);
  padding: 26px 20px 28px;
}

.page-about .scene-list {
  margin-top: 22px;
}

.page-about .scene {
  border: var(--about-line);
  background: var(--paper);
  box-shadow: var(--shadow-mid);
  margin-bottom: 14px;
}

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

.page-about .scene-head {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 15px 16px;
  cursor: pointer;
  list-style: none;
  font-weight: 700;
}

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

.page-about .scene-head::after {
  content: "+";
  font-family: var(--font-sans);
  font-size: 22px;
  font-weight: 900;
  line-height: 1;
  color: var(--teal);
}

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

.page-about .scene-no {
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: 14px;
  color: var(--ochre);
  letter-spacing: 0.08em;
}

.page-about .scene-name {
  flex: 1;
  font-size: 15.5px;
  line-height: 1.5;
}

.page-about .scene-body {
  padding: 14px 16px 18px;
  border-top: 2px dashed rgba(36, 30, 24, 0.32);
}

.page-about .scene-body p {
  font-size: 14px;
  line-height: 1.8;
  margin: 0 0 14px;
  max-width: 40em;
}

.page-about .scene-body .btn {
  font-size: 13px;
}

/* ---------- 收尾 ---------- */
.page-about .about-close {
  position: relative;
  margin-top: 8px;
  background: var(--ochre);
  border-top: 8px solid var(--loess);
  overflow: hidden;
}

.page-about .close-img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.3;
  mix-blend-mode: multiply;
}

.page-about .about-close-inner {
  position: relative;
  z-index: 1;
  padding-top: 46px;
  padding-bottom: 52px;
}

.page-about .close-kicker {
  display: inline-block;
  font-size: 12px;
  font-weight: 900;
  letter-spacing: 0.16em;
  color: var(--ink);
  background: var(--signal);
  border: 2px solid var(--ink);
  padding: 4px 10px;
  margin: 0 0 16px;
}

.page-about .close-copy h2 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(24px, 5.6vw, 40px);
  line-height: 1.24;
  color: var(--paper);
  margin: 0 0 14px;
  max-width: 18em;
}

.page-about .close-copy p {
  font-size: 15px;
  line-height: 1.85;
  color: rgba(250, 244, 232, 0.95);
  margin: 0 0 24px;
  max-width: 36em;
}

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

/* ---------- 平板 ---------- */
@media (min-width: 680px) {
  .page-about .path-strip {
    grid-template-columns: repeat(3, 1fr);
  }

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

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

  .page-about .about-hero-figure {
    transform: rotate(-1.6deg);
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 900px) {
  .page-about .about-hero {
    padding: 26px 0 60px;
  }

  .page-about .about-hero-inner {
    display: grid;
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    gap: 52px;
    align-items: end;
  }

  .page-about .about-hero-figure {
    margin-top: 0;
  }

  .page-about .chapter {
    padding: 56px 0;
  }

  .page-about .chapter--method .chapter-inner,
  .page-about .chapter--who .chapter-inner {
    width: 86%;
    margin-left: auto;
    padding: 32px 30px 36px;
  }

  .page-about .chapter--timeline .chapter-inner {
    padding: 36px 32px 44px;
  }

  .page-about .team-grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .page-about .track-line {
    display: block;
    position: absolute;
    top: 62px;
    left: 0;
    width: 100%;
    height: 120px;
    z-index: 0;
  }

  .page-about .track-line polyline {
    fill: none;
    stroke: var(--signal);
    stroke-width: 3;
    stroke-linecap: round;
    stroke-linejoin: round;
  }

  .page-about .track {
    grid-template-columns: repeat(5, 1fr);
    gap: 14px;
    padding-bottom: 6px;
  }

  .page-about .track-stop {
    border: none;
    background: none;
    padding: 0;
  }

  .page-about .stop-year {
    display: block;
    font-size: 28px;
  }

  .page-about .stop-dot {
    display: block;
    margin: 10px 0 12px;
    width: 14px;
    height: 14px;
  }

  .page-about .stop-title {
    margin-top: 0;
    font-size: 14px;
  }

  .page-about .stop-note {
    position: absolute;
    top: calc(100% + 12px);
    left: 0;
    width: 210px;
    margin: 0;
    padding: 12px 13px;
    background: var(--paper);
    color: var(--ink);
    border: 2px solid var(--ink);
    box-shadow: var(--shadow-mid);
    font-size: 12.5px;
    line-height: 1.65;
    opacity: 0;
    transform: translateY(-6px);
    pointer-events: none;
    transition: opacity 0.2s var(--ease), transform 0.2s var(--ease);
    z-index: 4;
  }

  .page-about .track-stop:hover .stop-note,
  .page-about .track-stop:focus-within .stop-note,
  .page-about .track-stop:focus .stop-note {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
  }
}

@media (min-width: 1024px) {
  .page-about .about-body {
    display: grid;
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: 40px;
    align-items: start;
  }

  .page-about .chapter-rail {
    display: block;
    position: sticky;
    top: 104px;
    border-left: 2px solid var(--loess);
    padding-left: 16px;
  }

  .page-about .rail-title {
    font-size: 11px;
    font-weight: 900;
    letter-spacing: 0.16em;
    color: var(--ochre);
    margin: 0 0 12px;
  }

  .page-about .rail-list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: grid;
    gap: 10px;
  }

  .page-about .rail-link {
    position: relative;
    display: block;
    padding-left: 16px;
    font-size: 13px;
    font-weight: 700;
    line-height: 1.5;
    color: var(--ink);
    text-decoration: none;
    transition: color 0.18s var(--ease);
  }

  .page-about .rail-link::before {
    content: "";
    position: absolute;
    left: 0;
    top: 6px;
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--teal-soft);
    border: 1.5px solid var(--teal);
    transition: background 0.18s var(--ease), transform 0.18s var(--ease);
  }

  .page-about .rail-link:hover,
  .page-about .rail-link:focus-visible {
    color: var(--ochre-deep);
  }

  .page-about .rail-link:hover::before,
  .page-about .rail-link:focus-visible::before {
    background: var(--ochre);
    border-color: var(--ochre-deep);
    transform: scale(1.25);
  }

  .page-about .about-close-inner {
    padding-top: 62px;
    padding-bottom: 68px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .stop-note,
  .page-about .rail-link,
  .page-about .rail-link::before {
    transition: none;
  }

  .page-about .about-hero-figure {
    transform: none;
  }
}
<<<END>>>