.page-about {
  --about-index-w: 56px;
  --about-gap: clamp(28px, 5vw, 56px);
}

.page-about > .container {
  display: block;
  padding-bottom: clamp(56px, 9vw, 104px);
}

/* ========== 首屏 ========== */
.page-about .about-hero {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--gap-lg);
  padding-top: clamp(28px, 5vw, 48px);
  padding-bottom: var(--about-gap);
  border-bottom: 1px solid var(--rule);
}

.page-about .about-hero__lead {
  position: relative;
  min-width: 0;
}

.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--mist);
  margin-bottom: var(--gap-md);
}

.page-about .breadcrumb a {
  color: var(--glacier-deep);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 160ms ease;
}

.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  border-bottom-color: var(--glacier);
}

.page-about .about-hero__kicker {
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--signal);
  margin: 0 0 var(--gap-sm);
}

.page-about .about-hero__title {
  margin: 0 0 var(--gap-md);
  font-size: clamp(34px, 7vw, 72px);
  line-height: 1.06;
  font-weight: 900;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.page-about .about-hero__lede {
  max-width: 40ch;
  margin: 0 0 var(--gap-lg);
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--gap-sm);
}

.page-about .about-hero__wave {
  display: none;
  width: 160px;
  height: 64px;
  color: var(--glacier);
  margin-top: var(--gap-lg);
}

.page-about .about-hero__figure {
  margin: 0;
  min-width: 0;
  border: 1px solid var(--rule);
  background: var(--paper-light);
  box-shadow: 6px 6px 0 rgba(16, 28, 54, 0.09);
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 8 / 10;
  object-fit: cover;
  filter: saturate(0.85) contrast(1.02);
}

.page-about .about-hero__figure figcaption {
  padding: 10px 14px;
  font-size: 12px;
  color: var(--mist);
  border-top: 1px solid var(--rule-soft);
}

@media (min-width: 900px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    column-gap: var(--gap-xl);
    align-items: start;
  }

  .page-about .about-hero__wave {
    display: block;
  }

  .page-about .about-hero__figure {
    margin-top: var(--gap-md);
  }
}

/* ========== 时间轴 ========== */
.page-about .about-timeline-section {
  padding-top: var(--about-gap);
  padding-bottom: var(--about-gap);
}

.page-about .section-head {
  margin-bottom: var(--gap-lg);
  min-width: 0;
}

.page-about .section-head__num {
  display: block;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--signal);
  margin-bottom: var(--gap-xs);
}

.page-about .section-head__title {
  margin: 0 0 var(--gap-sm);
  font-size: clamp(24px, 3.6vw, 44px);
  line-height: 1.16;
  font-weight: 900;
  letter-spacing: -0.015em;
  color: var(--ink);
}

.page-about .section-head__note {
  margin: 0;
  max-width: 52ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.page-about .section-head--tight {
  margin-bottom: var(--gap-md);
}

.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--gap-lg);
  position: relative;
}

.page-about .about-node {
  position: relative;
  display: grid;
  grid-template-columns: var(--about-index-w) minmax(0, 1fr);
  gap: var(--gap-sm);
  min-width: 0;
}

.page-about .about-node__index {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--signal);
  padding-top: 6px;
  position: relative;
}

.page-about .about-node__index::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 34px;
  bottom: -28px;
  width: 1px;
  background: var(--rule);
  transform: translateX(-50%);
}

.page-about .about-node:last-child .about-node__index::after {
  display: none;
}

.page-about .about-node__panel {
  position: relative;
  min-width: 0;
  background: var(--paper-light);
  border: 1px solid var(--rule);
  box-shadow: 4px 4px 0 rgba(16, 28, 54, 0.08);
  padding: var(--gap-md) var(--gap-md) var(--gap-lg);
  transition: border-color 160ms ease, box-shadow 160ms ease;
}

.page-about .about-node__panel::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 5px;
  background: var(--glacier);
}

.page-about .about-node--wide .about-node__panel::before {
  background: var(--flag-blue);
}

.page-about .about-node:nth-child(2) .about-node__panel::before {
  background: var(--flag-yellow);
}

.page-about .about-node__panel:hover {
  border-color: var(--glacier);
  box-shadow: 8px 8px 0 rgba(31, 158, 154, 0.16);
}

.page-about .about-node__range {
  margin: 0 0 var(--gap-xs);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--glacier-deep);
}

.page-about .about-node__title {
  margin: 0 0 var(--gap-sm);
  font-size: clamp(19px, 2.4vw, 24px);
  line-height: 1.3;
  font-weight: 800;
  color: var(--ink);
}

.page-about .about-node__panel p {
  margin: 0 0 var(--gap-sm);
  font-size: 15px;
  line-height: 1.78;
  color: var(--ink-soft);
}

.page-about .about-node__marks {
  list-style: none;
  margin: var(--gap-sm) 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .tag {
  display: inline-block;
  padding: 3px 10px;
  font-size: 12px;
  line-height: 1.6;
  border: 1px solid var(--rule);
  background: var(--paper);
  color: var(--ink-soft);
  border-radius: var(--radius);
  white-space: nowrap;
}

.page-about .tag--blue {
  border-color: var(--flag-blue);
  color: var(--flag-blue);
  background: rgba(46, 111, 209, 0.07);
}

.page-about .tag--green {
  border-color: var(--flag-green);
  color: var(--flag-green);
  background: rgba(47, 158, 91, 0.08);
}

.page-about .tag--yellow {
  border-color: var(--flag-yellow);
  color: #8b6110;
  background: rgba(217, 154, 23, 0.1);
}

.page-about .tag--red {
  border-color: var(--flag-red);
  color: var(--flag-red);
  background: rgba(200, 56, 60, 0.08);
}

@media (min-width: 900px) {
  .page-about .about-timeline {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    column-gap: var(--gap-md);
    row-gap: var(--gap-lg);
  }

  .page-about .about-node--wide {
    grid-column: 1 / span 7;
  }

  .page-about .about-node--narrow {
    grid-column: 8 / span 5;
  }

  .page-about .about-node--wide + .about-node--narrow {
    margin-top: var(--gap-lg);
  }
}

/* ========== 数据带 ========== */
.page-about .about-band {
  background: linear-gradient(160deg, var(--indigo) 0%, var(--midnight) 100%);
  color: var(--rail-text);
  padding: var(--gap-lg) var(--gap-md);
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--gap-lg);
  border: 1px solid var(--indigo);
  box-shadow: 6px 6px 0 rgba(16, 28, 54, 0.14);
  position: relative;
  overflow: hidden;
  min-width: 0;
}

.page-about .about-band::after {
  content: "";
  position: absolute;
  right: -60px;
  top: -60px;
  width: 240px;
  height: 240px;
  border-radius: 50%;
  border: 1px solid rgba(79, 209, 204, 0.16);
  pointer-events: none;
}

.page-about .about-band__intro,
.page-about .about-band__roles,
.page-about .about-band__figures {
  position: relative;
  z-index: 1;
  min-width: 0;
}

.page-about .about-band__kicker {
  margin: 0 0 var(--gap-xs);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--glacier-lite);
}

.page-about .about-band__title {
  margin: 0 0 var(--gap-sm);
  font-size: clamp(22px, 3.2vw, 34px);
  line-height: 1.24;
  font-weight: 900;
  letter-spacing: -0.01em;
  color: var(--paper-light);
}

.page-about .about-band__lede {
  margin: 0 0 var(--gap-md);
  max-width: 46ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--rail-text);
}

.page-about .about-band__figure {
  margin: 0;
  border: 1px solid var(--rail-line);
}

.page-about .about-band__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 10 / 7;
  object-fit: cover;
  filter: saturate(0.6) brightness(0.92);
}

.page-about .about-band__figure figcaption {
  padding: 10px 12px;
  font-size: 12px;
  color: var(--rail-dim);
  border-top: 1px solid var(--rail-line);
}

.page-about .about-band__roles {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.page-about .role {
  border: 1px solid var(--rail-line);
  background: rgba(248, 245, 239, 0.045);
}

.page-about .role__head {
  display: grid;
  grid-template-columns: 5px minmax(0, 1fr) auto;
  align-items: center;
  gap: 12px;
  padding: 12px 14px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .role__head:focus-visible {
  outline: 2px solid var(--glacier-lite);
  outline-offset: -2px;
}

.page-about .role__bar {
  display: block;
  width: 5px;
  height: 22px;
}

.page-about .role__bar--blue { background: var(--flag-blue); }
.page-about .role__bar--green { background: var(--flag-green); }
.page-about .role__bar--yellow { background: var(--flag-yellow); }

.page-about .role__name {
  font-size: 15px;
  font-weight: 700;
  color: var(--paper-light);
}

.page-about .role__hint {
  font-size: 12px;
  color: var(--rail-dim);
  white-space: nowrap;
}

.page-about .role__body {
  padding: 0 14px 14px 31px;
}

.page-about .role__body p {
  margin: 0;
  font-size: 14px;
  line-height: 1.76;
  color: var(--rail-text);
}

.page-about .about-figures__caption {
  margin: 0 0 var(--gap-sm);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--glacier-lite);
}

.page-about .about-figures {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--rail-line);
}

.page-about .about-figures__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: baseline;
  gap: 4px 14px;
  padding: 11px 0;
  border-bottom: 1px solid var(--rail-line);
}

.page-about .about-figures__key {
  font-size: 14px;
  color: var(--rail-dim);
}

.page-about .about-figures__val {
  font-size: 18px;
  font-weight: 700;
  color: var(--paper-light);
  text-align: right;
}

.page-about .about-figures__unit {
  grid-column: 1 / -1;
  font-size: 12px;
  color: var(--rail-dim);
}

@media (min-width: 900px) {
  .page-about .about-band {
    grid-template-columns: minmax(0, 5fr) minmax(0, 4fr) minmax(0, 3fr);
    gap: var(--gap-lg);
    padding: var(--gap-xl) var(--gap-lg);
  }

  .page-about .about-figures__row {
    grid-template-columns: minmax(0, auto) 1fr auto;
  }

  .page-about .about-figures__unit {
    grid-column: 2 / 3;
    text-align: left;
  }
}

/* ========== 适配投入 ========== */
.page-about .about-fit {
  margin-top: var(--about-gap);
  border: 1px solid var(--rule);
  background: var(--paper-light);
  box-shadow: 6px 6px 0 rgba(16, 28, 54, 0.08);
  display: grid;
  grid-template-columns: 1fr;
  position: relative;
  min-width: 0;
}

.page-about .about-fit__figure {
  margin: 0;
  overflow: hidden;
  border-bottom: 1px solid var(--rule);
}

.page-about .about-fit__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 20 / 9;
  object-fit: cover;
  filter: saturate(0.35) contrast(1.05) brightness(1.04);
}

.page-about .about-fit__body {
  padding: var(--gap-md) var(--gap-md) var(--gap-lg);
  min-width: 0;
}

.page-about .about-fit__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--gap-md);
}

.page-about .about-fit__cell {
  min-width: 0;
  padding-top: var(--gap-sm);
  border-top: 2px solid var(--indigo);
}

.page-about .about-fit__cell:nth-child(2) { border-top-color: var(--glacier); }
.page-about .about-fit__cell:nth-child(3) { border-top-color: var(--flag-yellow); }
.page-about .about-fit__cell:nth-child(4) { border-top-color: var(--flag-blue); }

.page-about .about-fit__cell-num {
  margin: 0 0 6px;
  font-size: 28px;
  font-weight: 700;
  line-height: 1;
  color: var(--signal);
}

.page-about .about-fit__cell h3 {
  margin: 0 0 6px;
  font-size: 16px;
  font-weight: 800;
  color: var(--ink);
}

.page-about .about-fit__cell p {
  margin: 0;
  font-size: 14px;
  line-height: 1.74;
  color: var(--ink-soft);
}

.page-about .about-fit__link {
  display: inline-block;
  margin-top: var(--gap-lg);
  font-size: 15px;
  font-weight: 700;
  color: var(--glacier-deep);
  text-decoration: none;
  border-bottom: 2px solid var(--glacier);
  padding-bottom: 2px;
  transition: color 160ms ease, border-color 160ms ease;
}

.page-about .about-fit__link:hover,
.page-about .about-fit__link:focus-visible {
  color: var(--signal);
  border-bottom-color: var(--signal);
}

.page-about .about-fit__stripe {
  position: absolute;
  top: 0;
  width: 5px;
  height: 22px;
}

.page-about .about-fit__stripe--blue { background: var(--flag-blue); left: 0; }
.page-about .about-fit__stripe--red { background: var(--flag-red); left: 9px; }
.page-about .about-fit__stripe--green { background: var(--flag-green); left: 18px; }
.page-about .about-fit__stripe--yellow { background: var(--flag-yellow); left: 27px; }

@media (min-width: 720px) {
  .page-about .about-fit__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--gap-md) var(--gap-lg);
  }
}

@media (min-width: 900px) {
  .page-about .about-fit {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }

  .page-about .about-fit__figure {
    border-bottom: none;
    border-right: 1px solid var(--rule);
  }

  .page-about .about-fit__figure img {
    height: 100%;
    aspect-ratio: auto;
  }

  .page-about .about-fit__body {
    padding: var(--gap-lg);
  }
}

/* ========== 版本回溯 ========== */
.page-about .about-archive {
  margin-top: var(--about-gap);
  padding-top: var(--about-gap);
  border-top: 1px solid var(--rule);
}

.page-about .about-archive__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--gap-md);
}

.page-about .about-archive__panel {
  min-width: 0;
  background: var(--paper-light);
  border: 1px solid var(--rule);
  border-left: 5px solid var(--glacier);
  padding: var(--gap-md);
}

.page-about .about-archive__panel:nth-child(2) {
  border-left-color: var(--flag-blue);
}

.page-about .about-archive__panel h3 {
  margin: 0 0 var(--gap-sm);
  font-size: 18px;
  font-weight: 800;
  color: var(--ink);
}

.page-about .about-archive__panel p {
  margin: 0 0 var(--gap-sm);
  font-size: 15px;
  line-height: 1.78;
  color: var(--ink-soft);
}

.page-about .about-archive__panel p:last-of-type {
  margin-bottom: 0;
}

.page-about .about-archive__tags {
  list-style: none;
  margin: var(--gap-sm) 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .about-archive__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--gap-sm);
  margin-top: var(--gap-lg);
}

@media (min-width: 900px) {
  .page-about .about-archive__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: var(--gap-lg);
  }
}

/* ========== 服务标准 ========== */
.page-about .about-service {
  margin-top: var(--about-gap);
  padding: var(--gap-lg) 0 0;
  border-top: 1px solid var(--rule);
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--gap-lg);
}

.page-about .about-service__body {
  min-width: 0;
}

.page-about .about-service__kicker {
  margin: 0 0 var(--gap-xs);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--signal);
}

.page-about .about-service__title {
  margin: 0 0 var(--gap-sm);
  font-size: clamp(24px, 3.4vw, 40px);
  line-height: 1.18;
  font-weight: 900;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .about-service__lede {
  margin: 0 0 var(--gap-md);
  max-width: 48ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.page-about .about-service__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.page-about .about-service__list li {
  display: grid;
  grid-template-columns: 12px minmax(0, 1fr);
  align-items: baseline;
  gap: 12px;
  font-size: 15px;
  line-height: 1.72;
  color: var(--ink-soft);
}

.page-about .about-service__list strong {
  color: var(--ink);
  font-weight: 800;
}

.page-about .about-service__dot {
  display: block;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  transform: translateY(-1px);
}

.page-about .about-service__dot--green { background: var(--flag-green); }
.page-about .about-service__dot--blue { background: var(--flag-blue); }
.page-about .about-service__dot--yellow { background: var(--flag-yellow); }
.page-about .about-service__dot--red { background: var(--flag-red); }

.page-about .about-service__card {
  min-width: 0;
  background: linear-gradient(150deg, var(--indigo) 0%, var(--midnight) 100%);
  color: var(--rail-text);
  padding: var(--gap-md) var(--gap-md) var(--gap-lg);
  border: 1px solid var(--indigo);
  box-shadow: 6px 6px 0 rgba(16, 28, 54, 0.14);
}

.page-about .about-service__card-label {
  margin: 0 0 var(--gap-sm);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--glacier-lite);
}

.page-about .about-service__card-text {
  margin: 0 0 var(--gap-md);
  font-size: 15px;
  line-height: 1.78;
  color: var(--rail-text);
}

.page-about .about-service__card-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--gap-sm);
}

@media (min-width: 900px) {
  .page-about .about-service {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: var(--gap-xl);
    align-items: start;
  }
}

/* ========== 窄屏保护 ========== */
@media (max-width: 480px) {
  .page-about .about-node {
    grid-template-columns: 32px minmax(0, 1fr);
  }

  .page-about .about-node__panel {
    padding: var(--gap-sm) var(--gap-sm) var(--gap-md);
  }

  .page-about .about-band {
    padding: var(--gap-md) var(--gap-sm);
  }
}

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

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