.page-about {
  --about-pad: clamp(18px, 5vw, 44px);
  --about-note: 236px;
  --about-rule: rgba(201, 145, 63, 0.2);
  background: var(--ink-900);
  color: var(--cream);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  padding-bottom: 72px;
  overflow-x: hidden;
}

.page-about * {
  box-sizing: border-box;
}

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

.page-about h1,
.page-about h2,
.page-about h3 {
  font-family: var(--font-display);
  letter-spacing: -0.01em;
  line-height: 1.24;
  margin: 0;
}

.page-about h2 {
  font-size: clamp(25px, 4vw, 38px);
  font-weight: 800;
  max-width: 22ch;
}

.page-about h3 {
  font-size: 19px;
  font-weight: 700;
}

.page-about p {
  margin: 0;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: 26px var(--about-pad) 52px;
  background:
    radial-gradient(120% 90% at 86% 0%, rgba(201, 145, 63, 0.24), transparent 58%),
    linear-gradient(155deg, var(--ink-900) 0%, var(--ink-700) 58%, var(--ink-900) 100%);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  left: -12%;
  right: -12%;
  bottom: -34%;
  height: 56%;
  background: linear-gradient(90deg, rgba(169, 80, 63, 0.34), rgba(201, 145, 63, 0.1));
  transform: skewY(-6deg);
  transform-origin: left bottom;
  pointer-events: none;
}

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

.page-about .about-hero__grid {
  display: grid;
  gap: 30px;
}

.page-about .breadcrumbs {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.04em;
  color: var(--teal);
  margin-bottom: 20px;
}

.page-about .breadcrumbs a {
  color: var(--teal);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.page-about .breadcrumbs a:hover {
  color: var(--gold-soft);
  border-bottom-color: var(--line-strong);
}

.page-about .breadcrumbs [aria-current="page"] {
  color: var(--gold-soft);
}

.page-about .about-hero .eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--gold);
  margin-bottom: 14px;
}

.page-about h1 {
  font-size: clamp(30px, 6.4vw, 60px);
  font-weight: 900;
  max-width: 18ch;
  margin-bottom: 20px;
}

.page-about .about-hero__lead {
  max-width: 60ch;
  color: var(--mist);
  font-size: 16px;
}

.page-about .about-hero__stats {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 16px 30px;
  margin: 26px 0 0;
  padding: 0;
}

.page-about .about-hero__stats li {
  border-left: 2px solid var(--gold);
  padding-left: 12px;
  min-width: 92px;
}

.page-about .about-stat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(20px, 3.4vw, 28px);
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--gold-soft);
  line-height: 1.2;
}

.page-about .about-stat__label {
  display: block;
  font-size: 12px;
  color: var(--teal);
  letter-spacing: 0.05em;
}

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

.page-about .about-hero__actions .btn {
  text-decoration: none;
}

.page-about .about-hero__media {
  margin: 0;
  border-radius: 3px;
  overflow: hidden;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 26px), calc(100% - 26px) 100%, 0 100%);
  box-shadow: 0 24px 48px -28px rgba(0, 0, 0, 0.8);
}

.page-about .about-hero__media img {
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(0.82) contrast(1.04);
}

/* ---------- 路径线主体 ---------- */
.page-about .about-body {
  max-width: var(--shell-max);
  margin: 0 auto;
  padding: 8px var(--about-pad) 0;
}

.page-about .about-track {
  position: relative;
  padding-left: 26px;
}

.page-about .about-track::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 6px;
  bottom: 6px;
  width: 2px;
  background: linear-gradient(180deg, rgba(201, 145, 63, 0.8), rgba(201, 145, 63, 0.32) 52%, rgba(126, 149, 156, 0.16));
}

.page-about .about-sec {
  padding: 40px 0;
  border-top: 1px solid var(--about-rule);
}

.page-about .about-sec:first-child {
  border-top: 0;
  padding-top: 20px;
}

.page-about .about-sec__head {
  position: relative;
  margin-bottom: 22px;
}

.page-about .about-sec__head .k8-num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--gold);
  margin-bottom: 10px;
}

.page-about .about-sec__tag {
  display: inline-block;
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--gold-soft);
  border: 1px solid var(--line-strong);
  border-radius: 2px;
  padding: 3px 8px;
  opacity: 0.45;
  transition: opacity 0.18s var(--ease);
}

.page-about .about-split {
  display: grid;
  gap: 24px;
}

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

.page-about .about-lead {
  color: var(--mist);
  max-width: 62ch;
  margin-bottom: 22px;
}

.page-about .about-body-text {
  color: var(--teal);
  font-size: 15px;
  max-width: 64ch;
  margin-top: 22px;
}

.page-about .about-pull {
  margin-top: 22px;
  padding-left: 16px;
  border-left: 3px solid var(--gold);
  font-family: var(--font-display);
  font-size: clamp(17px, 2.6vw, 21px);
  font-weight: 700;
  color: var(--cream);
  max-width: 40ch;
}

.page-about .about-note {
  color: var(--teal);
  font-size: 13.5px;
  line-height: 1.7;
  max-width: 42ch;
}

.page-about .about-note__label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--gold);
  margin-bottom: 8px;
}

/* ---------- 四步流程 ---------- */
.page-about .flow-steps {
  list-style: none;
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
}

.page-about .flow-step {
  position: relative;
  background: var(--ink-700);
  border: 1px solid var(--about-rule);
  border-radius: 3px;
  padding: 18px 16px 20px;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 16px), calc(100% - 16px) 100%, 0 100%);
  transition: border-color 0.2s var(--ease), transform 0.2s var(--ease);
}

.page-about .flow-step:hover {
  border-color: var(--line-strong);
  transform: translateY(-3px);
}

.page-about .flow-step__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--gold);
  margin-bottom: 8px;
}

.page-about .flow-step h3 {
  margin-bottom: 8px;
}

.page-about .flow-step p {
  font-size: 14.5px;
  color: var(--mist);
}

/* ---------- 米色档案面板 ---------- */
.page-about .about-paper {
  background: var(--paper);
  color: var(--charcoal);
  border-radius: 3px;
  border-top: 4px solid var(--gold);
  padding: clamp(18px, 4vw, 30px);
}

.page-about .num-grid {
  list-style: none;
  display: grid;
  gap: 10px;
  margin: 0 0 22px;
  padding: 0;
}

.page-about .num-card {
  background: var(--mist);
  border-left: 3px solid var(--gold);
  border-radius: 2px;
  padding: 13px 14px 15px;
}

.page-about .num-card__code {
  display: block;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--ink-900);
  margin-bottom: 6px;
}

.page-about .num-card h3 {
  font-size: 16.5px;
  color: var(--ink-900);
  margin-bottom: 5px;
}

.page-about .num-card p {
  font-size: 13.5px;
  color: var(--charcoal);
  line-height: 1.65;
}

.page-about .version-row {
  display: grid;
  gap: 16px;
  align-items: start;
}

.page-about .version-compare {
  display: grid;
  gap: 10px;
}

.page-about .version-col {
  border: 1px solid rgba(11, 27, 43, 0.18);
  border-radius: 2px;
  padding: 14px 15px 16px;
  background: rgba(247, 243, 236, 0.7);
}

.page-about .version-col--old {
  border-left: 3px solid var(--brick);
}

.page-about .version-col--new {
  border-left: 3px solid var(--gold);
}

.page-about .version-col__label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--brick);
  margin-bottom: 8px;
}

.page-about .version-col--new .version-col__label {
  color: #8c6222;
}

.page-about .version-col h3 {
  font-size: 16px;
  color: var(--ink-900);
  margin-bottom: 6px;
}

.page-about .version-col p {
  font-size: 13.5px;
  color: var(--charcoal);
  line-height: 1.65;
}

.page-about .about-stamp {
  margin: 0;
  border-radius: 2px;
  overflow: hidden;
}

.page-about .about-stamp img {
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(0.8);
}

.page-about .about-caption {
  margin-top: 18px;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.8;
  letter-spacing: 0.02em;
  color: #4a5a63;
}

/* ---------- 团队 ---------- */
.page-about .team-grid {
  list-style: none;
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
}

.page-about .team-card {
  background: var(--ink-700);
  border: 1px solid var(--about-rule);
  border-radius: 3px;
  padding: 18px 16px 20px;
}

.page-about .team-card__index {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: rgba(201, 145, 63, 0.75);
  margin-bottom: 8px;
}

.page-about .team-card h3 {
  margin-bottom: 8px;
}

.page-about .team-card p {
  font-size: 14.5px;
  color: var(--mist);
}

.page-about .about-figure {
  margin: 26px 0 0;
}

.page-about .about-figure img {
  width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: 3px;
  filter: saturate(0.78) contrast(1.03);
}

.page-about .about-figure figcaption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.03em;
  color: var(--teal);
}

/* ---------- 时间轴 ---------- */
.page-about .filter-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0 0 26px;
}

.page-about .filter-btn {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  padding: 7px 13px;
  border-radius: 2px;
  border: 1px solid var(--line-strong);
  background: transparent;
  color: var(--mist);
  cursor: pointer;
  transition: background 0.18s var(--ease), color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.page-about .filter-btn:hover {
  border-color: var(--gold-soft);
  color: var(--gold-soft);
}

.page-about .filter-btn[aria-pressed="true"] {
  background: var(--gold);
  border-color: var(--gold);
  color: var(--ink-900);
}

.page-about .filter-btn:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
}

.page-about .filter-count {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--teal);
}

.page-about .filter-item[hidden] {
  display: none;
}

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

.page-about .timeline-item {
  position: relative;
  display: grid;
  gap: 6px;
  padding: 0 0 26px;
}

.page-about .timeline-item::before {
  content: "";
  position: absolute;
  left: -25px;
  top: 8px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 0 4px rgba(201, 145, 63, 0.16);
}

.page-about .timeline-item__year {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--gold-soft);
}

.page-about .timeline-item__body h3 {
  margin-bottom: 6px;
}

.page-about .timeline-item__body p {
  font-size: 14.5px;
  color: var(--mist);
  max-width: 60ch;
}

/* ---------- 上架标准 ---------- */
.page-about .standard-list {
  list-style: none;
  counter-reset: std;
  display: grid;
  gap: 16px;
  margin: 0;
  padding: 0;
}

.page-about .standard-list li {
  position: relative;
  padding-left: 44px;
  border-bottom: 1px dashed rgba(126, 149, 156, 0.28);
  padding-bottom: 16px;
}

.page-about .standard-list li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .standard-list__num {
  position: absolute;
  left: 0;
  top: 2px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--gold);
}

.page-about .standard-list p {
  font-size: 15px;
  color: var(--mist);
}

.page-about .standard-list strong {
  color: var(--cream);
  font-weight: 700;
}

/* ---------- 结尾入口 ---------- */
.page-about .about-cta {
  margin-top: 44px;
  padding: clamp(22px, 4.5vw, 38px);
  background:
    linear-gradient(122deg, rgba(201, 145, 63, 0.2), rgba(18, 48, 74, 0.94) 62%, rgba(11, 27, 43, 0.98));
  border: 1px solid var(--line-strong);
  border-radius: 3px;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 22px), calc(100% - 22px) 100%, 0 100%);
}

.page-about .about-cta h2 {
  font-size: clamp(22px, 3.6vw, 32px);
  max-width: 24ch;
  margin-bottom: 10px;
}

.page-about .about-cta p {
  color: var(--mist);
  font-size: 15px;
  max-width: 56ch;
}

.page-about .about-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}

.page-about .about-cta__links .btn {
  text-decoration: none;
}

/* ---------- 悬停显示章节标签 ---------- */
@media (hover: hover) {
  .page-about .about-sec__tag {
    opacity: 0;
  }

  .page-about .about-sec__head:hover .about-sec__tag,
  .page-about .about-sec__head:focus-within .about-sec__tag {
    opacity: 1;
  }
}

/* ---------- 平板 ---------- */
@media (min-width: 720px) {
  .page-about .flow-steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

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

  .page-about .timeline-item {
    grid-template-columns: 74px minmax(0, 1fr);
    gap: 16px;
    align-items: start;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 900px) {
  .page-about .about-hero {
    padding-top: 34px;
    padding-bottom: 66px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: center;
    gap: 44px;
  }

  .page-about .about-track {
    padding-left: 56px;
  }

  .page-about .about-track::before {
    left: 14px;
  }

  .page-about .timeline-item::before {
    left: -47px;
    top: 9px;
  }

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

  .page-about .about-split {
    grid-template-columns: minmax(0, 1fr) var(--about-note);
    gap: 40px;
    align-items: start;
  }

  .page-about .about-sec__head {
    padding-right: 190px;
    margin-bottom: 26px;
  }

  .page-about .about-sec__tag {
    position: absolute;
    top: 4px;
    right: 0;
    margin-top: 0;
  }

  .page-about .version-row {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 0.65fr);
    gap: 22px;
    align-items: start;
  }

  .page-about .flow-steps {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .num-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-cta {
    margin-left: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .flow-step,
  .page-about .about-sec__tag,
  .page-about .filter-btn {
    transition: none;
  }

  .page-about .flow-step:hover {
    transform: none;
  }
}
<<<END>>>