.page-about {
  --about-line: rgba(94, 107, 122, 0.38);
  --about-line-soft: rgba(94, 107, 122, 0.22);
  --about-rail-w: 196px;
  background: var(--ink-900);
  color: var(--paper);
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  padding: clamp(36px, 6vw, 76px) 0 clamp(32px, 5vw, 60px);
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-hero__media {
  position: absolute;
  inset: 0;
  z-index: -1;
}

.page-about .about-hero__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.38;
  filter: saturate(0.55) contrast(1.08);
}

.page-about .about-hero__media::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(5, 11, 20, 0.9) 0%, rgba(8, 17, 31, 0.78) 52%, var(--ink-900) 100%),
    repeating-linear-gradient(90deg, rgba(55, 230, 212, 0.055) 0 1px, transparent 1px 72px);
}

.page-about .about-hero__title {
  margin: 18px 0 0;
  font-family: var(--font-display);
  font-size: var(--fs-h1);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: 0.01em;
  color: var(--paper);
  max-width: 15ch;
}

.page-about .about-hero__lead {
  margin: 20px 0 0;
  max-width: 62ch;
  font-size: var(--fs-body);
  line-height: 1.75;
  color: var(--paper-dim);
}

.page-about .about-hero__stats {
  list-style: none;
  margin: 32px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--about-line);
  border: 1px solid var(--about-line);
  max-width: 780px;
}

.page-about .about-hero__stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 14px 16px 16px;
  background: var(--ink-800);
}

.page-about .about-stat__num {
  font-family: var(--font-mono);
  font-size: 26px;
  line-height: 1;
  color: var(--cyan);
  letter-spacing: -0.01em;
}

.page-about .about-stat__label {
  font-size: var(--fs-index);
  letter-spacing: 0.08em;
  color: var(--steel);
}

.page-about .about-hero__actions {
  margin-top: 28px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 侧边轨道 + 主体 ---------- */
.page-about .about-shell {
  padding-top: clamp(8px, 2vw, 24px);
  padding-bottom: clamp(48px, 7vw, 96px);
}

.page-about .about-rail {
  padding: 18px 0 6px;
  border-bottom: 1px solid var(--about-line-soft);
}

.page-about .about-rail__label {
  margin: 0;
  font-size: var(--fs-index);
  letter-spacing: 0.18em;
  color: var(--steel);
}

.page-about .about-rail__list {
  list-style: none;
  margin: 10px 0 0;
  padding: 0 0 4px;
  display: flex;
  gap: 4px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-rail__link {
  display: block;
  padding: 8px 12px;
  border-left: 2px solid transparent;
  font-family: var(--font-mono);
  font-size: var(--fs-index);
  letter-spacing: 0.08em;
  color: var(--steel);
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  color: var(--cyan);
  border-left-color: var(--cyan);
  background: rgba(55, 230, 212, 0.06);
}

.page-about .about-rail__link[aria-current="true"] {
  color: var(--orange);
  border-left-color: var(--orange);
  background: rgba(255, 107, 26, 0.07);
}

/* ---------- 通用段落文字 ---------- */
.page-about .about-intro {
  margin: 0 0 4px;
  max-width: 72ch;
  font-size: var(--fs-body);
  line-height: 1.8;
  color: var(--paper-dim);
}

.page-about .about-prose p {
  margin: 0 0 18px;
}

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

.page-about .about-prose a {
  color: var(--cyan);
}

/* ---------- 01 日常 ---------- */
.page-about .about-focus {
  margin-top: 24px;
}

.page-about .about-note {
  padding: 18px 18px 20px;
  align-self: start;
}

.page-about .about-note__label {
  margin: 0 0 14px;
  font-size: var(--fs-index);
  letter-spacing: 0.16em;
  color: var(--orange);
}

.page-about .about-note__list {
  margin: 0;
  display: grid;
  gap: 1px;
  background: var(--about-line-soft);
}

.page-about .about-note__row {
  background: var(--ink-800);
  padding: 10px 0 10px 2px;
  display: grid;
  gap: 3px;
}

.page-about .about-note__row dt {
  font-size: var(--fs-index);
  letter-spacing: 0.1em;
  color: var(--steel);
}

.page-about .about-note__row dd {
  margin: 0;
  font-size: var(--fs-small);
  color: var(--paper);
}

/* ---------- 02 团队矩阵 ---------- */
.page-about .role-matrix {
  margin-top: 26px;
  display: grid;
  gap: 1px;
  background: var(--about-line);
  border: 1px solid var(--about-line);
}

.page-about .role {
  padding: 20px 18px 22px;
  background: var(--ink-800);
  border-top: 2px solid transparent;
  transition: background 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .role:hover,
.page-about .role:focus-within {
  background: var(--ink-700);
  border-top-color: var(--orange);
}

.page-about .role__index {
  margin: 0;
  font-size: var(--fs-index);
  letter-spacing: 0.16em;
  color: var(--steel);
}

.page-about .role__name {
  margin: 8px 0 0;
  font-size: var(--fs-h3);
  font-weight: 600;
  color: var(--paper);
}

.page-about .role__size {
  margin: 8px 0 0;
  font-size: 30px;
  line-height: 1;
  color: var(--cyan);
}

.page-about .role__size span {
  font-size: var(--fs-index);
  letter-spacing: 0.1em;
  color: var(--steel);
  margin-left: 4px;
}

.page-about .role__duties {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  display: grid;
  gap: 9px;
}

.page-about .role__duties li {
  position: relative;
  padding-left: 16px;
  font-size: var(--fs-small);
  line-height: 1.6;
  color: var(--paper-dim);
}

.page-about .role__duties li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 6px;
  height: 6px;
  background: var(--steel);
  transition: background 0.2s var(--ease);
}

.page-about .role:hover .role__duties li::before {
  background: var(--orange);
}

.page-about .about-photo {
  margin-top: 26px;
}

.page-about .about-photo .media-frame__img {
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 03 发布流程 ---------- */
.page-about .review-layout {
  margin-top: 24px;
  display: grid;
  gap: 22px;
}

.page-about .review-layers {
  display: grid;
  gap: 1px;
  background: var(--about-line);
  border: 1px solid var(--about-line);
  align-self: start;
}

.page-about .layer {
  padding: 18px 18px 20px;
  background: var(--ink-800);
  border-left: 3px solid var(--steel);
  transition: background 0.2s var(--ease);
}

.page-about .layer--source {
  background: #141e2a;
  border-left-color: var(--cyan);
}

.page-about .layer--cross {
  background: #18222e;
  border-left-color: var(--yellow);
}

.page-about .layer--publish {
  background: #1c2733;
  border-left-color: var(--green);
}

.page-about .layer:hover {
  background: var(--ink-700);
}

.page-about .layer__step {
  margin: 0;
  font-size: var(--fs-index);
  letter-spacing: 0.18em;
  color: var(--steel);
}

.page-about .layer__name {
  margin: 8px 0 8px;
  font-size: var(--fs-h3);
  font-weight: 600;
  color: var(--paper);
}

.page-about .layer__text {
  margin: 0;
  font-size: var(--fs-small);
  line-height: 1.7;
  color: var(--paper-dim);
}

/* ---------- 04 演进 ---------- */
.page-about .evo {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 4px;
}

.page-about .evo__item {
  position: relative;
  padding: 0 0 22px 26px;
  border-left: 1px solid var(--about-line);
}

.page-about .evo__item:last-child {
  padding-bottom: 0;
}

.page-about .evo__node {
  position: absolute;
  left: -5px;
  top: 2px;
  width: 9px;
  height: 9px;
  background: var(--orange);
}

.page-about .evo__tag {
  margin: 0;
  font-size: var(--fs-index);
  letter-spacing: 0.18em;
  color: var(--steel);
}

.page-about .evo__name {
  margin: 8px 0 8px;
  font-size: var(--fs-h3);
  font-weight: 600;
  color: var(--paper);
}

.page-about .evo__text {
  margin: 0;
  max-width: 46ch;
  font-size: var(--fs-small);
  line-height: 1.75;
  color: var(--paper-dim);
}

/* ---------- 05 服务对象 ---------- */
.page-about .who-list {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  border-top: 1px solid var(--about-line);
}

.page-about .who {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 12px;
  padding: 18px 0;
  border-bottom: 1px solid var(--about-line-soft);
  transition: background 0.2s var(--ease);
}

.page-about .who:hover {
  background: rgba(42, 52, 66, 0.45);
}

.page-about .who__tag {
  font-size: var(--fs-index);
  letter-spacing: 0.16em;
  color: var(--orange);
  padding-top: 3px;
}

.page-about .who__title {
  margin: 0 0 6px;
  font-size: var(--fs-h3);
  font-weight: 600;
  color: var(--paper);
}

.page-about .who__text {
  margin: 0;
  font-size: var(--fs-small);
  line-height: 1.75;
  color: var(--paper-dim);
}

.page-about .about-coop {
  margin: 22px 0 0;
  max-width: 72ch;
  font-size: var(--fs-small);
  line-height: 1.75;
  color: var(--paper-dim);
}

.page-about .about-coop a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(55, 230, 212, 0.45);
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

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

/* ---------- 06 本地服务 ---------- */
.page-about .local-panel {
  padding: 24px 20px 26px;
  display: grid;
  gap: 26px;
}

.page-about .local-panel__title {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-size: var(--fs-h2);
  font-weight: 700;
  line-height: 1.15;
  color: var(--paper);
  max-width: 18ch;
}

.page-about .local-panel__text {
  margin: 16px 0 0;
  max-width: 56ch;
  font-size: var(--fs-small);
  line-height: 1.85;
  color: var(--paper-dim);
}

.page-about .local-panel__actions {
  margin-top: 22px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .local-panel__meta {
  margin: 0;
  display: grid;
  gap: 1px;
  background: var(--about-line);
  border: 1px solid var(--about-line);
  align-self: start;
}

.page-about .local-meta__row {
  display: grid;
  gap: 4px;
  padding: 12px 14px;
  background: var(--ink-800);
}

.page-about .local-meta__row dt {
  font-size: var(--fs-index);
  letter-spacing: 0.14em;
  color: var(--steel);
}

.page-about .local-meta__row dd {
  margin: 0;
  font-size: var(--fs-small);
  line-height: 1.65;
  color: var(--paper);
  word-break: break-word;
}

/* ---------- 断点 ---------- */
@media (min-width: 620px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-about .local-panel {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
    gap: 30px;
    padding: 30px 28px 32px;
  }
}

@media (min-width: 900px) {
  .page-about .about-shell {
    display: grid;
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: clamp(28px, 3.4vw, 60px);
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--header-h) + 22px);
    padding: 12px 0 12px 0;
    border-bottom: 0;
    border-left: 1px solid var(--about-line-soft);
  }

  .page-about .about-rail__label {
    padding-left: 10px;
  }

  .page-about .about-rail__list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
  }

  .page-about .review-layout {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.85fr);
    gap: 30px;
    align-items: start;
  }

  .page-about .about-photo {
    margin-top: 28px;
  }

  .page-about .evo {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0;
    margin-top: 32px;
  }

  .page-about .evo__item {
    padding: 26px 26px 0 0;
    border-left: 0;
    border-top: 1px solid var(--about-line);
    padding-bottom: 0;
  }

  .page-about .evo__item:last-child {
    padding-bottom: 0;
  }

  .page-about .evo__node {
    left: 0;
    top: -5px;
  }

  .page-about .who {
    grid-template-columns: 64px minmax(0, 1fr);
    gap: 20px;
    padding: 22px 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-rail__link,
  .page-about .role,
  .page-about .role__duties li::before,
  .page-about .layer,
  .page-about .who,
  .page-about .about-coop a {
    transition: none;
  }
}