.page-about {
  --about-rule: 1px solid var(--ash);
  --about-rule-dark: 1px solid rgba(244, 241, 232, 0.18);
  background: var(--paper);
  color: var(--slate);
  font-family: var(--font-body);
  overflow-x: hidden;
}

.page-about a {
  color: inherit;
}

.page-about .container,
.page-about .container--wide {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding-left: var(--pad);
  padding-right: var(--pad);
}

.page-about .container--wide {
  max-width: calc(var(--maxw) + 120px);
}

.page-about h1,
.page-about h2,
.page-about h3 {
  margin: 0;
  font-weight: 400;
  font-family: var(--font-display);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  background: var(--ink-green);
  color: var(--paper);
  padding: clamp(20px, 3vw, 34px) 0 clamp(30px, 5vw, 66px);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -10% -20% auto 30%;
  height: 150%;
  background: repeating-linear-gradient(
    112deg,
    rgba(255, 197, 61, 0.07) 0 1px,
    transparent 1px 46px
  );
  pointer-events: none;
}

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

.page-about .breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--ash);
  margin-bottom: clamp(20px, 4vw, 40px);
}

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

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

.page-about .breadcrumbs__sep {
  color: var(--slate-blue);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 44px);
}

.page-about .about-kicker {
  margin: 0 0 14px;
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--citrus);
  font-family: var(--font-num);
  text-transform: uppercase;
}

.page-about h1 {
  font-size: clamp(36px, 7vw, 72px);
  line-height: 0.98;
  letter-spacing: 0.005em;
  color: var(--paper);
  max-width: 16em;
}

.page-about .about-lead {
  margin: clamp(16px, 2vw, 24px) 0 0;
  max-width: 34em;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.75;
  color: var(--paper);
  opacity: 0.86;
}

.page-about .about-facts {
  list-style: none;
  margin: clamp(24px, 4vw, 40px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px 20px;
  border-top: var(--about-rule-dark);
  padding-top: clamp(18px, 3vw, 28px);
}

.page-about .about-facts .stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .about-facts .stat__value {
  font-family: var(--font-num);
  font-size: clamp(28px, 4.2vw, 44px);
  line-height: 1;
  color: var(--citrus);
  font-variant-numeric: tabular-nums;
}

.page-about .about-facts .stat__label {
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--ash);
}

.page-about .about-hero__rail {
  display: grid;
  gap: clamp(16px, 2.4vw, 24px);
  align-content: start;
}

.page-about .media-frame {
  margin: 0;
  display: block;
  border: var(--about-rule);
  background: var(--moss);
  overflow: hidden;
}

.page-about .media-frame img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
}

.page-about .media-frame--cut {
  clip-path: polygon(0 0, 100% 0, 100% 86%, 0 100%);
}

.page-about .media-frame__caption {
  display: block;
  padding: 10px 12px;
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: 0.04em;
  color: var(--ash);
  background: var(--ink-green);
  border-top: var(--about-rule-dark);
}

.page-about .about-keys {
  margin: 0;
  border-top: var(--about-rule-dark);
}

.page-about .about-keys__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.4fr);
  gap: 10px;
  padding: 11px 0;
  border-bottom: var(--about-rule-dark);
}

.page-about .about-keys dt {
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--slate-blue);
}

.page-about .about-keys dd {
  margin: 0;
  font-size: 14px;
  line-height: 1.6;
  color: var(--paper);
  opacity: 0.9;
}

/* ---------- 通用章节 ---------- */
.page-about .about-section {
  padding: clamp(38px, 6vw, 82px) 0;
  background: var(--paper);
}

.page-about .about-section--tint {
  background: #EFEBE0;
  border-top: var(--about-rule);
  border-bottom: var(--about-rule);
}

.page-about .section-head {
  display: grid;
  gap: 10px;
  margin-bottom: clamp(24px, 4vw, 44px);
  border-bottom: var(--about-rule);
  padding-bottom: clamp(14px, 2vw, 22px);
}

.page-about .section-head__num {
  display: inline-block;
  width: max-content;
  font-family: var(--font-num);
  font-size: 14px;
  letter-spacing: 0.16em;
  padding: 3px 9px;
  background: var(--ink-green);
  color: var(--citrus);
}

.page-about .section-head__title {
  font-size: clamp(22px, 3.4vw, 34px);
  line-height: 1.2;
  color: var(--ink-green);
}

.page-about .section-head__note {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--slate-blue);
  max-width: 60ch;
}

.page-about .about-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3.4vw, 40px);
  align-items: start;
}

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

.page-about .about-grid__rail {
  min-width: 0;
  display: grid;
  gap: 18px;
  align-content: start;
}

.page-about .prose {
  margin: 0 0 18px;
  max-width: 34em;
  font-size: 16px;
  line-height: 1.78;
  color: var(--slate);
}

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

/* ---------- 定位与取舍 ---------- */
.page-about .about-note {
  padding: 18px 18px 20px;
  border: var(--about-rule);
  background: var(--paper);
  box-shadow: var(--paper-shadow);
}

.page-about .about-note p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--slate);
}

.page-about .about-note__label {
  margin-bottom: 8px !important;
  font-family: var(--font-num);
  font-size: 12px !important;
  letter-spacing: 0.16em;
  color: var(--citrus) !important;
  background: var(--ink-green);
  display: inline-block;
  padding: 3px 8px;
}

.page-about .about-note__foot {
  margin-top: 10px !important;
  font-size: 13px !important;
  color: var(--slate-blue) !important;
}

.page-about .about-note__foot a,
.page-about .about-railbox a {
  color: var(--ink-green);
  text-decoration: none;
  border-bottom: 1px solid var(--citrus);
}

.page-about .about-note__foot a:hover,
.page-about .about-railbox a:hover {
  background: var(--citrus-soft);
}

.page-about .about-code {
  margin: 12px 0 0 !important;
  font-family: var(--font-num);
  font-size: 15px !important;
  letter-spacing: 0.05em;
  color: var(--ink-green) !important;
  border-top: var(--about-rule);
  padding-top: 10px;
}

.page-about .about-quote {
  font-style: italic;
  border-left: 3px solid var(--citrus);
  padding-left: 12px;
}

.page-about .about-scope {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(18px, 3vw, 28px);
  margin-top: clamp(26px, 4vw, 46px);
}

.page-about .about-scope__col {
  border: var(--about-rule);
  padding: 18px;
  background: var(--paper);
}

.page-about .about-scope__col--out {
  background: #EFEBE0;
}

.page-about .about-scope__col h3 {
  font-size: 19px;
  color: var(--ink-green);
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: var(--about-rule);
}

.page-about .about-scope__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 11px;
}

.page-about .about-scope__list li {
  font-size: 15px;
  line-height: 1.65;
  display: flex;
  gap: 10px;
  align-items: baseline;
}

.page-about .about-scope__list--cut li {
  color: var(--slate-blue);
  padding-left: 16px;
  position: relative;
}

.page-about .about-scope__list--cut li::before {
  content: "—";
  position: absolute;
  left: 0;
  color: var(--alert);
}

.page-about .about-scope__list .tag {
  flex: 0 0 auto;
  font-size: 11px;
  letter-spacing: 0.12em;
  padding: 2px 7px;
  border: 1px solid var(--slate-blue);
  color: var(--slate-blue);
}

.page-about .about-scope__list .tag--ok {
  border-color: var(--electric);
  color: var(--ink-green);
  background: rgba(47, 224, 168, 0.16);
}

.page-about .about-scope__list .tag--line {
  border-color: var(--citrus);
  background: var(--citrus-soft);
}

/* ---------- 深色阶段分隔带 ---------- */
.page-about .about-band {
  background: var(--ink-green);
  color: var(--paper);
  padding: clamp(38px, 6vw, 82px) 0;
}

.page-about .about-band .section-head {
  border-bottom: var(--about-rule-dark);
}

.page-about .about-band .section-head__num {
  background: var(--citrus);
  color: var(--ink-green);
  font-weight: 500;
}

.page-about .about-band .section-head__title {
  color: var(--paper);
}

.page-about .about-band .section-head__note {
  color: var(--ash);
}

.page-about .about-grid--band .about-grid__wide {
  display: grid;
  gap: clamp(18px, 2.6vw, 30px);
}

.page-about .stage {
  border-top: var(--about-rule-dark);
  padding-top: clamp(16px, 2.4vw, 26px);
  scroll-margin-top: 24px;
}

.page-about .stage__num {
  display: block;
  font-family: var(--font-num);
  font-size: clamp(54px, 11vw, 108px);
  line-height: 0.86;
  letter-spacing: -0.02em;
  color: var(--citrus);
  opacity: 0.92;
  font-variant-numeric: tabular-nums;
}

.page-about .stage__title {
  font-size: clamp(19px, 2.5vw, 26px);
  line-height: 1.28;
  color: var(--paper);
  margin: 8px 0 12px;
}

.page-about .stage__body {
  margin: 0 0 14px;
  max-width: 34em;
  font-size: 15px;
  line-height: 1.78;
  color: var(--paper);
  opacity: 0.84;
}

.page-about .stage__note {
  margin: 0;
  max-width: 40em;
  border-left: 3px solid var(--citrus);
  padding: 4px 0 4px 12px;
  font-size: 14px;
  font-style: italic;
  line-height: 1.7;
  color: var(--citrus-soft);
}

.page-about .about-railbox {
  border: var(--about-rule-dark);
  background: var(--moss);
  padding: 18px;
}

.page-about .about-railbox--light {
  background: var(--paper);
  border: var(--about-rule);
  color: var(--slate);
}

.page-about .about-railbox__title {
  margin: 0 0 16px;
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--citrus);
}

.page-about .about-railbox--light .about-railbox__title {
  color: var(--slate-blue);
}

.page-about .about-railbox__text {
  margin: 0 0 12px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--slate);
}

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

.page-about .about-railbox__foot {
  margin: 16px 0 0;
  padding-top: 12px;
  border-top: var(--about-rule-dark);
  font-size: 13px;
  line-height: 1.7;
  color: var(--ash);
}

.page-about .about-railbox a,
.page-about .about-railbox__foot a {
  color: var(--citrus);
}

.page-about .about-railbox--light a,
.page-about .about-railbox--light .about-railbox__foot a {
  color: var(--ink-green);
}

/* 时间轴 */
.page-about .timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 26px;
  position: relative;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 12px;
  bottom: 12px;
  width: 2px;
  background: var(--slate-blue);
}

.page-about .timeline__item {
  position: relative;
  margin-bottom: 8px;
}

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

.page-about .timeline__dot {
  position: absolute;
  left: -26px;
  top: 14px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--citrus);
  border: 3px solid var(--ink-green);
}

.page-about .timeline__link {
  display: block;
  text-decoration: none;
  padding: 7px 8px;
  border: 1px solid transparent;
  transition: border-color 0.18s ease, transform 0.18s ease;
}

.page-about .timeline__stage {
  display: block;
  font-family: var(--font-num);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--slate-blue);
}

.page-about .timeline__name {
  display: block;
  font-size: 15px;
  color: var(--paper);
  margin-top: 2px;
}

.page-about .timeline__link:hover,
.page-about .timeline__link:focus-visible {
  border-color: var(--citrus);
  transform: translateY(-4px);
}

.page-about .timeline__note {
  margin: 0 0 6px;
  padding: 0 8px;
  max-height: 0;
  overflow: hidden;
  font-size: 13px;
  line-height: 1.6;
  color: var(--ash);
  transition: max-height 0.22s ease;
}

.page-about .timeline__item:hover .timeline__note,
.page-about .timeline__item:focus-within .timeline__note {
  max-height: 6em;
}

/* ---------- 分层卡片 ---------- */
.page-about .layer-cards {
  display: grid;
  gap: 14px;
}

.page-about .layer-card {
  border: var(--about-rule);
  background: var(--paper);
  padding: 18px;
  box-shadow: var(--paper-shadow);
}

.page-about .layer-card__tag {
  margin: 0 0 8px;
  font-family: var(--font-num);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--slate-blue);
}

.page-about .layer-card__title {
  font-size: 21px;
  color: var(--ink-green);
  margin-bottom: 10px;
}

.page-about .layer-card p:last-child {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--slate);
}

/* ---------- 团队分工 ---------- */
.page-about .role-list {
  list-style: none;
  margin: 0 0 clamp(22px, 3vw, 34px);
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .role {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  grid-template-rows: auto auto;
  gap: 4px 16px;
  border: var(--about-rule);
  background: var(--paper);
  padding: 16px 18px;
  transition: transform 0.18s ease, border-color 0.18s ease;
}

.page-about .role:hover,
.page-about .role:focus-within {
  transform: translateY(-4px);
  border-color: var(--citrus);
}

.page-about .role__count {
  grid-row: span 2;
  margin: 0;
  align-self: center;
  font-family: var(--font-num);
  font-size: clamp(34px, 5vw, 48px);
  line-height: 1;
  color: var(--citrus);
  background: var(--ink-green);
  padding: 6px 12px;
  font-variant-numeric: tabular-nums;
}

.page-about .role__name {
  font-size: 18px;
  color: var(--ink-green);
}

.page-about .role p:last-child {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--slate);
}

.page-about .about-figure {
  border: var(--about-rule);
}

/* ---------- 数据源 ---------- */
.page-about .source-list {
  list-style: none;
  margin: 6px 0 0;
  padding: 0;
  border-top: var(--about-rule);
}

.page-about .source-list li {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 4px;
  padding: 13px 0;
  border-bottom: var(--about-rule);
}

.page-about .source-list__k {
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--slate-blue);
}

.page-about .source-list__v {
  font-size: 15px;
  line-height: 1.7;
  color: var(--slate);
}

/* ---------- 更新节奏带 ---------- */
.page-about .about-band--rhythm {
  padding-top: 0;
}

.page-about .about-band__figure {
  border: none;
  margin-bottom: clamp(28px, 4.6vw, 56px);
}

.page-about .about-band__figure .media-frame__caption {
  background: transparent;
  padding-left: 0;
  border-top: none;
}

.page-about .rhythm-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 18px;
}

.page-about .rhythm {
  border-left: 3px solid var(--citrus);
  padding: 2px 0 2px 16px;
}

.page-about .rhythm__when {
  display: block;
  font-family: var(--font-num);
  font-size: clamp(19px, 2.4vw, 26px);
  letter-spacing: 0.02em;
  color: var(--citrus);
  margin-bottom: 6px;
}

.page-about .rhythm__what {
  margin: 0;
  max-width: 36em;
  font-size: 15px;
  line-height: 1.75;
  color: var(--paper);
  opacity: 0.85;
}

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

.page-about .about-contact li {
  display: grid;
  gap: 3px;
  padding: 10px 0;
  border-bottom: var(--about-rule-dark);
  font-size: 14px;
  line-height: 1.65;
  color: var(--paper);
}

.page-about .about-contact li span {
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--slate-blue);
}

.page-about .about-contact li a {
  color: var(--citrus);
  text-decoration: none;
  word-break: break-all;
}

.page-about .about-contact li a:hover,
.page-about .about-contact li a:focus-visible {
  background: rgba(255, 197, 61, 0.16);
}

.page-about .about-cta {
  margin-top: clamp(30px, 4.6vw, 56px);
  padding-top: clamp(18px, 2.6vw, 28px);
  border-top: var(--about-rule-dark);
  display: grid;
  gap: 18px;
}

.page-about .about-cta__title {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: clamp(20px, 2.6vw, 28px);
  color: var(--paper);
}

.page-about .about-cta__note {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--ash);
  max-width: 46ch;
}

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

.page-about .btn {
  display: inline-block;
  text-decoration: none;
  font-size: 14px;
  letter-spacing: 0.06em;
  padding: 12px 20px;
  border: 1px solid var(--citrus);
  transition: transform 0.18s ease, background-color 0.18s ease;
}

.page-about .btn--accent {
  background: var(--citrus);
  color: var(--ink-green);
}

.page-about .btn--onDark {
  color: var(--paper);
  border-color: var(--slate-blue);
}

.page-about .btn:hover,
.page-about .btn:focus-visible {
  transform: translateY(-4px);
}

.page-about .btn--accent:hover,
.page-about .btn--accent:focus-visible {
  background: var(--citrus-soft);
}

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

/* ---------- 断点 ---------- */
@media (min-width: 620px) {
  .page-about .about-facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

  .page-about .source-list li {
    grid-template-columns: minmax(0, 160px) minmax(0, 1fr);
    gap: 16px;
    align-items: baseline;
  }

  .page-about .about-cta {
    grid-template-columns: minmax(0, 1.6fr) auto;
    align-items: end;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
    gap: clamp(30px, 4vw, 58px);
  }

  .page-about .about-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: clamp(28px, 4vw, 52px);
  }

  .page-about .about-grid--reverse .about-grid__wide {
    order: 1;
  }

  .page-about .about-grid__rail {
    position: sticky;
    top: 24px;
  }

  .page-about .layer-card:nth-child(2) {
    margin-left: 16px;
  }

  .page-about .layer-card:nth-child(3) {
    margin-left: 32px;
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .timeline__link,
  .page-about .timeline__note,
  .page-about .role,
  .page-about .btn {
    transition: none;
  }

  .page-about .timeline__link:hover,
  .page-about .timeline__link:focus-visible,
  .page-about .role:hover,
  .page-about .role:focus-within,
  .page-about .btn:hover,
  .page-about .btn:focus-visible {
    transform: none;
  }
}