.page-about {
  background:
    radial-gradient(1100px 420px at 8% -6%, rgba(127, 178, 201, 0.30), transparent 62%),
    radial-gradient(900px 380px at 96% 3%, rgba(201, 180, 138, 0.20), transparent 60%),
    linear-gradient(180deg, #EDF2F6 0%, var(--wk-base) 45%, #E3EAF0 100%);
  color: var(--wk-ink);
  overflow-x: hidden;
}

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

/* ---------- 首屏框景 ---------- */
.page-about .ab-hero-band {
  padding: 18px 0 34px;
  border-bottom: var(--wk-bw) solid var(--wk-ink);
  background: linear-gradient(135deg, rgba(245, 241, 234, 0.92), rgba(232, 237, 242, 0.55));
}

.page-about .ab-hero {
  position: relative;
  border: var(--wk-bw) solid var(--wk-ink);
  box-shadow: var(--wk-shadow);
  background: linear-gradient(150deg, var(--wk-cream) 0%, #EDF1F5 56%, var(--wk-mist) 100%);
  padding: 26px 18px 22px;
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  top: 8px;
  left: 16px;
  right: 16px;
  height: 6px;
  background: repeating-linear-gradient(90deg, var(--wk-gold) 0 2px, transparent 2px 14px);
}

.page-about .ab-hero::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 88px;
  height: 6px;
  background: var(--wk-cyan);
}

.page-about .ab-hero .wk-crumbs {
  margin-top: 10px;
}

.page-about .ab-hero__code {
  margin: 14px 0 10px;
  color: var(--wk-gray);
  letter-spacing: 0.06em;
}

.page-about .ab-hero__lead {
  max-width: 62ch;
  margin: 14px 0 0;
}

.page-about .ab-chips {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 0;
  margin: 20px 0 0;
}

.page-about .ab-chip {
  font-family: var(--wk-font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  padding: 4px 10px;
  border: 1px solid var(--wk-gold);
  background: rgba(201, 180, 138, 0.16);
  color: var(--wk-ink);
}

.page-about .ab-chip:nth-child(2) {
  border-color: var(--wk-blue);
  background: rgba(127, 178, 201, 0.20);
}

.page-about .ab-chip:nth-child(3) {
  border-color: var(--wk-slate);
  background: rgba(211, 222, 232, 0.85);
}

.page-about .ab-chip:nth-child(4) {
  border-color: var(--wk-cyan-deep);
  background: rgba(14, 124, 142, 0.12);
}

.page-about .ab-chip:nth-child(5) {
  border-color: var(--wk-coral);
  background: rgba(255, 122, 89, 0.14);
}

.page-about .ab-hero__note {
  margin: 18px 0 0;
  color: var(--wk-gray);
  line-height: 1.7;
}

/* ---------- 索引 + 正文骨架 ---------- */
.page-about .ab-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 20px;
  padding-top: 24px;
  padding-bottom: 56px;
}

.page-about .ab-toc {
  position: sticky;
  top: 6px;
  z-index: 6;
  display: flex;
  gap: 10px;
  align-items: center;
  overflow-x: auto;
  padding: 10px 12px;
  border: var(--wk-bw) solid var(--wk-ink);
  background: rgba(240, 244, 248, 0.94);
  box-shadow: 4px 4px 0 rgba(16, 22, 31, 0.14);
  backdrop-filter: blur(6px);
}

.page-about .ab-toc__title {
  flex: 0 0 auto;
  margin: 0;
  color: var(--wk-gray);
}

.page-about .ab-toc__link {
  flex: 0 0 auto;
  font-family: var(--wk-font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--wk-gray);
  text-decoration: none;
  padding: 4px 8px;
  border-left: 3px solid transparent;
  white-space: nowrap;
  transition: color 0.2s var(--wk-ease), border-color 0.2s var(--wk-ease);
}

.page-about .ab-toc__link:hover {
  color: var(--wk-ink);
}

.page-about .ab-toc__link[aria-current="true"] {
  color: var(--wk-ink);
  border-left-color: var(--wk-cyan);
  background: rgba(23, 195, 178, 0.10);
}

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

.page-about .ab-sec {
  padding: 44px 0 10px;
}

.page-about .ab-text {
  margin-top: 18px;
}

.page-about .ab-media {
  margin: 22px 0 0;
}

.page-about .ab-media .wk-media__img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .ab-note {
  margin: 20px 0 0;
  padding: 14px 16px;
  border: var(--wk-bw) solid var(--wk-ink);
  background: var(--wk-cream);
  font-size: 16px;
  line-height: 1.8;
}

/* ---------- 横向时间轴 ---------- */
.page-about .ab-timeline {
  position: relative;
  display: grid;
  gap: 18px;
  margin-top: 26px;
}

.page-about .ab-timeline::before {
  content: "";
  position: absolute;
  left: 13px;
  top: 6px;
  bottom: 6px;
  width: 2px;
  background: linear-gradient(180deg, var(--wk-gold), var(--wk-blue));
}

.page-about .ab-round {
  position: relative;
  padding-left: 34px;
}

.page-about .ab-round__dot {
  position: absolute;
  left: 7px;
  top: 8px;
  width: 14px;
  height: 14px;
  border: 2px solid var(--wk-ink);
  border-radius: 50%;
  background: var(--wk-cream);
  box-shadow: 0 0 0 3px rgba(127, 178, 201, 0.35);
}

.page-about .ab-round__panel {
  background: var(--wk-cream);
}

.page-about .ab-round__stage {
  margin: 0 0 6px;
  color: var(--wk-coral);
  letter-spacing: 0.08em;
}

.page-about .ab-round__text {
  margin: 10px 0 14px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--wk-slate);
}

.page-about .ab-round__impact {
  margin: 12px 0 0;
  color: var(--wk-gray);
}

.page-about .ab-round .wk-fold__trigger {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  text-align: left;
}

.page-about .ab-round .wk-fold__label {
  flex: 1 1 auto;
  font-size: 15px;
}

/* ---------- 列表 ---------- */
.page-about .ab-list {
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
}

.page-about .ab-list li {
  position: relative;
  padding: 5px 0 5px 18px;
  font-size: 15.5px;
  line-height: 1.75;
  color: var(--wk-slate);
}

.page-about .ab-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 15px;
  width: 9px;
  height: 2px;
  background: var(--wk-blue);
}

.page-about .ab-list--alert li::before {
  background: var(--wk-coral);
}

/* ---------- 结构总览 ---------- */
.page-about .ab-legend {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  padding: 0;
  margin: 22px 0 0;
  font-family: var(--wk-font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--wk-slate);
}

.page-about .ab-legend__item {
  display: inline-flex;
  align-items: center;
  gap: 7px;
}

.page-about .ab-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  flex: 0 0 auto;
}

.page-about .ab-dot--brand { background: var(--wk-gold); }
.page-about .ab-dot--data { background: var(--wk-blue); }
.page-about .ab-dot--notice { background: var(--wk-slate); }
.page-about .ab-dot--qa { background: var(--wk-cyan-deep); }
.page-about .ab-dot--feed { background: var(--wk-coral); }

.page-about .ab-struct {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-top: 18px;
}

.page-about .ab-block {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 12px 12px 14px;
  border: var(--wk-bw) solid var(--wk-ink);
  background: var(--wk-cream);
  box-shadow: 3px 3px 0 rgba(16, 22, 31, 0.16);
  color: inherit;
  text-decoration: none;
  transition: transform 0.2s var(--wk-ease), box-shadow 0.2s var(--wk-ease), background-color 0.2s var(--wk-ease);
}

.page-about a.ab-block:hover {
  transform: translate(-2px, -2px);
  box-shadow: 5px 5px 0 rgba(16, 22, 31, 0.20);
  background: #FBF8F2;
}

.page-about .ab-block:focus-visible {
  outline: 2px solid var(--wk-cyan);
  outline-offset: 2px;
}

.page-about .ab-block__code {
  color: var(--wk-gray);
}

.page-about .ab-block__name {
  font-family: var(--wk-font-head);
  font-size: 17px;
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.3;
}

.page-about .ab-block__dest {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: auto;
  color: var(--wk-gray);
}

.page-about .ab-block--current {
  background: var(--wk-mist);
}

.page-about .ab-block--legal {
  background: var(--wk-base);
  box-shadow: none;
  border-style: dashed;
}

/* ---------- 对照区 ---------- */
.page-about .ab-compare {
  position: relative;
  margin-top: 20px;
}

.page-about .ab-radio {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
}

.page-about .ab-fbtn {
  display: inline-flex;
  align-items: center;
  margin: 0 8px 8px 0;
  padding: 6px 12px;
  border: var(--wk-bw) solid var(--wk-ink);
  background: var(--wk-mist);
  color: var(--wk-ink);
  font-family: var(--wk-font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  cursor: pointer;
  transition: background-color 0.2s var(--wk-ease), box-shadow 0.2s var(--wk-ease), transform 0.2s var(--wk-ease);
}

.page-about .ab-fbtn:hover {
  background: #C2D5E3;
}

.page-about .ab-radio:checked + .ab-fbtn {
  background: var(--wk-cyan);
  box-shadow: 3px 3px 0 rgba(16, 22, 31, 0.24);
  transform: translate(-1px, -1px);
}

.page-about .ab-radio:focus-visible + .ab-fbtn {
  outline: 2px solid var(--wk-cyan);
  outline-offset: 2px;
}

.page-about .ab-tablewrap {
  overflow-x: auto;
  border: var(--wk-bw) solid var(--wk-ink);
  background: var(--wk-cream);
  box-shadow: var(--wk-shadow);
}

.page-about .ab-table {
  width: 100%;
  min-width: 640px;
  border-collapse: collapse;
}

.page-about .ab-table__caption {
  text-align: left;
  padding: 10px 14px;
  background: var(--wk-mist);
  border-bottom: var(--wk-bw) solid var(--wk-ink);
  color: var(--wk-slate);
}

.page-about .ab-table th {
  font-family: var(--wk-font-mono);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-align: left;
  padding: 10px 14px;
  background: var(--wk-slate);
  color: #D9E4EC;
  border-right: 1px solid rgba(217, 228, 236, 0.22);
}

.page-about .ab-table th:last-child {
  border-right: 0;
}

.page-about .ab-table td {
  padding: 12px 14px;
  vertical-align: top;
  font-size: 15px;
  line-height: 1.7;
  border-top: 1px solid rgba(16, 22, 31, 0.16);
}

.page-about .ab-table tbody tr:nth-child(odd) {
  background: var(--wk-cream);
}

.page-about .ab-table tbody tr:nth-child(even) {
  background: #E9EFF4;
}

.page-about .ab-table .ab-cell-dev {
  white-space: nowrap;
  font-family: var(--wk-font-mono);
  font-size: 13.5px;
  letter-spacing: 0.04em;
  color: var(--wk-ink);
}

.page-about #ab-dev-desk:checked ~ .ab-tablewrap .ab-row:not(.ab-row--desk),
.page-about #ab-dev-lap:checked ~ .ab-tablewrap .ab-row:not(.ab-row--lap),
.page-about #ab-dev-tab:checked ~ .ab-tablewrap .ab-row:not(.ab-row--tab),
.page-about #ab-dev-phone:checked ~ .ab-tablewrap .ab-row:not(.ab-row--phone),
.page-about #ab-dev-fold:checked ~ .ab-tablewrap .ab-row:not(.ab-row--fold),
.page-about #ab-dev-screen:checked ~ .ab-tablewrap .ab-row:not(.ab-row--screen) {
  display: none;
}

.page-about .ab-callout {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  align-items: center;
  justify-content: space-between;
  margin-top: 18px;
  padding: 16px 18px;
  border: var(--wk-bw) solid var(--wk-ink);
  background: linear-gradient(90deg, rgba(127, 178, 201, 0.22), rgba(245, 241, 234, 0.9));
}

.page-about .ab-callout__text {
  margin: 0;
  max-width: 58ch;
  font-size: 16px;
  line-height: 1.8;
}

.page-about .ab-callout__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ---------- 节奏卡 ---------- */
.page-about .ab-cards {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
  margin-top: 22px;
}

.page-about .ab-card {
  display: flex;
  flex-direction: column;
  background: var(--wk-cream);
}

.page-about .ab-card:nth-child(2) {
  background: var(--wk-mist);
}

.page-about .ab-card__code {
  margin: 0 0 8px;
  color: var(--wk-gray);
  letter-spacing: 0.06em;
}

.page-about .ab-card__text {
  margin: 10px 0 0;
  font-size: 16px;
  line-height: 1.8;
  color: var(--wk-slate);
}

.page-about .ab-card__link {
  margin-top: 16px;
  align-self: flex-start;
  color: var(--wk-cyan-deep);
  text-decoration: none;
  border-bottom: 2px solid var(--wk-cyan);
  padding-bottom: 2px;
}

.page-about .ab-card__link:hover {
  color: var(--wk-ink);
}

.page-about .ab-strip {
  margin-top: 18px;
}

.page-about .ab-strip__title {
  margin: 0 0 8px;
  color: var(--wk-gray);
  letter-spacing: 0.06em;
}

.page-about .ab-strip__text {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--wk-slate);
}

/* ---------- 服务与边界 ---------- */
.page-about .ab-service {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
  margin-top: 22px;
}

.page-about .wk-panel--deep .ab-card__code,
.page-about .wk-panel--deep .wk-idx {
  color: #9FB4C2;
}

.page-about .ab-contact {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
}

.page-about .ab-contact li {
  display: grid;
  grid-template-columns: 84px minmax(0, 1fr);
  gap: 10px;
  padding: 9px 0;
  border-top: 1px solid rgba(217, 228, 236, 0.2);
}

.page-about .ab-contact li:first-child {
  border-top: 0;
}

.page-about .ab-contact__v {
  word-break: break-word;
}

.page-about .ab-contact__hint {
  margin: 16px 0 0;
  padding-top: 12px;
  border-top: 1px solid rgba(217, 228, 236, 0.2);
  font-size: 14.5px;
  line-height: 1.75;
  color: #C3D2DC;
}

.page-about .ab-boundary {
  background: var(--wk-cream);
}

.page-about .ab-boundary__sub {
  margin: 20px 0 0;
  font-family: var(--wk-font-head);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.page-about .ab-boundary__foot {
  margin: 16px 0 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--wk-gray);
}

.page-about .ab-inline {
  color: var(--wk-cyan-deep);
  text-decoration: none;
  border-bottom: 2px solid var(--wk-cyan);
}

.page-about .ab-inline:hover {
  color: var(--wk-ink);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .ab-hero {
    padding: 34px 32px 30px;
  }

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

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

@media (min-width: 900px) {
  .page-about .ab-layout {
    grid-template-columns: 208px minmax(0, 1fr);
    gap: 32px;
    align-items: start;
    padding-top: 34px;
  }

  .page-about .ab-toc {
    flex-direction: column;
    align-items: stretch;
    overflow: visible;
    gap: 2px;
    padding: 16px 14px;
    top: 14px;
  }

  .page-about .ab-toc__title {
    margin: 0 0 8px;
    padding-left: 11px;
  }

  .page-about .ab-toc__link {
    padding: 7px 10px;
  }

  .page-about .ab-sec {
    padding: 8px 0 10px;
  }

  .page-about .ab-timeline {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
    margin-top: 42px;
  }

  .page-about .ab-timeline::before {
    left: 4px;
    right: 4px;
    top: 14px;
    bottom: auto;
    width: auto;
    height: 2px;
    background: linear-gradient(90deg, var(--wk-blue), var(--wk-gold));
  }

  .page-about .ab-round {
    padding-left: 0;
    padding-top: 38px;
  }

  .page-about .ab-round:nth-child(2) {
    padding-top: 62px;
  }

  .page-about .ab-round__dot {
    left: 6px;
    top: 8px;
  }

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

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

  .page-about .ab-service {
    grid-template-columns: 1.08fr 1fr;
  }
}

@media (min-width: 1200px) {
  .page-about .ab-hero {
    padding: 40px 40px 34px;
  }
}
<<<END>>>