.page-about {
  --about-axis: 96px;
  --about-fill-1: rgba(200, 255, 77, 0.85);
  --about-fill-2: rgba(200, 255, 77, 0.58);
  --about-fill-3: rgba(200, 255, 77, 0.38);
  --about-fill-4: rgba(200, 255, 77, 0.24);
  --about-glow: 0 0 12px rgba(200, 255, 77, 0.25);
}

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

.page-about .media__frame {
  border: 1px solid var(--line);
  background: var(--bg-2);
  overflow: hidden;
}

.page-about .media__frame img {
  width: 100%;
  object-fit: cover;
  filter: saturate(0.72) brightness(0.86);
  transition: filter 240ms var(--ease), border-color 240ms var(--ease);
}

.page-about .media__frame:hover img {
  filter: saturate(0.86) brightness(0.95);
}

.page-about .media__caption {
  margin-top: 10px;
  font-size: 12px;
  line-height: 1.7;
  color: var(--ink-3);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: clamp(20px, 4vw, 40px) 0 clamp(28px, 5vw, 56px);
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3vw, 40px);
  align-items: end;
}

.page-about .about-hero__lead h1 {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(30px, 7vw, 56px);
  line-height: 1.06;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .about-hero__text {
  margin-top: 18px;
  max-width: 46ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink-2);
}

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

.page-about .about-glance {
  margin-top: clamp(26px, 4vw, 44px);
  border-top: 1px solid var(--line);
  padding-top: clamp(18px, 2.4vw, 26px);
}

.page-about .about-glance .stat__value {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(26px, 4.4vw, 42px);
  line-height: 1.1;
  color: var(--ink);
  font-variant-numeric: tabular-nums;
}

.page-about .about-glance .stat__value--gold {
  color: var(--gold);
  text-shadow: 0 0 12px rgba(232, 180, 74, 0.28);
}

.page-about .about-glance .stat__label {
  display: block;
  margin-top: 8px;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--ink-3);
}

.page-about .about-status {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 14px;
  margin-top: clamp(18px, 2.4vw, 26px);
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-left: 2px solid var(--lime);
  background: var(--bg-2);
}

.page-about .about-status__text {
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink-2);
}

/* ---------- 服务范围 ---------- */
.page-about .about-pillars {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  border-top: 1px solid var(--line);
}

.page-about .about-pillar {
  padding: 20px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-pillar__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 19px;
  color: var(--ink);
}

.page-about .about-pillar__text {
  margin: 8px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-2);
}

/* ---------- 时间线 ---------- */
.page-about .tl {
  position: relative;
  list-style: none;
  margin: clamp(20px, 3vw, 34px) 0 0;
  padding: 0;
}

.page-about .tl::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 6px;
  bottom: 6px;
  width: 1px;
  background: var(--line);
}

.page-about .tl__item {
  position: relative;
  display: grid;
  grid-template-columns: var(--about-axis) minmax(0, 1fr);
  gap: 12px;
  padding: 0 0 clamp(24px, 3.4vw, 40px);
}

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

.page-about .tl__axis {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 6px;
  padding-top: 3px;
}

.page-about .tl__dot {
  width: 10px;
  height: 10px;
  flex: none;
  background: var(--bg-2);
  border: 1px solid var(--line);
}

.page-about .tl__item.is-done .tl__dot {
  background: var(--gold);
  border-color: var(--gold);
}

.page-about .tl__item.is-current .tl__dot {
  background: var(--lime);
  border-color: var(--lime);
  box-shadow: var(--about-glow);
}

.page-about .tl__ver {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  color: var(--gold);
  word-break: break-word;
}

.page-about .tl__item.is-current .tl__ver {
  color: var(--lime);
}

.page-about .tl__stage {
  font-size: 10px;
  letter-spacing: 0.14em;
  color: var(--ink-3);
}

.page-about .tl__body {
  padding-left: 12px;
  border-left: 1px solid var(--line);
  transition: border-color 240ms var(--ease);
}

.page-about .tl__item:hover .tl__body,
.page-about .tl__item:focus-within .tl__body {
  border-left-color: var(--lime);
}

.page-about .tl__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(18px, 2vw, 23px);
  line-height: 1.3;
  color: var(--ink);
}

.page-about .tl__body p {
  margin: 8px 0 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-2);
}

.page-about .tl__item--wide .tl__body p {
  max-width: 74ch;
}

.page-about .tl__item.is-current .tl__body {
  border-left-color: var(--lime);
}

.page-about .tl__more {
  margin-top: 12px;
  border-top: 1px solid var(--line);
  padding-top: 10px;
}

.page-about .tl__more > summary {
  cursor: pointer;
  list-style: none;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--lime);
  padding: 4px 0;
}

.page-about .tl__more > summary::-webkit-details-marker {
  display: none;
}

.page-about .tl__more > summary::before {
  content: "+ ";
  font-family: var(--font-mono);
}

.page-about .tl__more[open] > summary::before {
  content: "− ";
}

.page-about .tl__more > summary:focus-visible {
  outline: 1px solid var(--lime);
  outline-offset: 3px;
}

.page-about .tl__more p {
  margin-top: 10px;
  font-size: 14px;
  color: var(--ink-2);
}

.page-about .verstrip {
  display: flex;
  margin-top: clamp(26px, 3.6vw, 42px);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-about .verstrip__item {
  flex: 0 0 auto;
  min-width: 176px;
  padding: 14px 18px;
  border-right: 1px solid var(--line);
}

.page-about .verstrip__item:last-child {
  border-right: none;
}

.page-about .verstrip__ver {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  color: var(--gold);
}

.page-about .verstrip__note {
  display: block;
  margin-top: 6px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--ink-2);
}

/* ---------- 团队 ---------- */
.page-about .about-aside-text {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-2);
}

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

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

.page-about .crew__top {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
}

.page-about .crew__name {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .crew__num {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--gold);
  font-variant-numeric: tabular-nums;
}

.page-about .crew__bar {
  display: block;
  height: 8px;
  margin-top: 10px;
  background: var(--bg-2);
  border: 1px solid var(--line);
}

.page-about .crew__fill {
  display: block;
  height: 100%;
  transition: filter 240ms var(--ease);
}

.page-about .crew__row:hover .crew__fill {
  filter: brightness(1.25);
}

.page-about .crew__fill--1 { width: 43%; background: var(--about-fill-1); }
.page-about .crew__fill--2 { width: 33%; background: var(--about-fill-2); }
.page-about .crew__fill--3 { width: 14%; background: var(--about-fill-3); }
.page-about .crew__fill--4 { width: 10%; background: var(--about-fill-4); }

.page-about .crew__duty {
  margin: 10px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink-3);
}

/* ---------- 流程 ---------- */
.page-about .flow {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3vw, 40px);
}

.page-about .steps {
  list-style: none;
  margin: clamp(18px, 2.6vw, 28px) 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .steps__item {
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr);
  gap: 14px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
  transition: background-color 240ms var(--ease);
}

.page-about .steps__item:hover {
  background: var(--bg-2);
}

.page-about .steps__num {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--brick);
  letter-spacing: 0.06em;
  font-variant-numeric: tabular-nums;
  padding-top: 3px;
}

.page-about .steps__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .steps__text p {
  margin: 6px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-2);
}

.page-about .flow__aside .media__caption {
  max-width: 40ch;
}

/* ---------- 内容节奏 ---------- */
.page-about .about-editorial {
  align-items: start;
}

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

.page-about .topics__item {
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .topics__label {
  display: inline-block;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--lime);
}

.page-about .topics__item p {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-2);
}

/* ---------- 用户分布 ---------- */
.page-about .audience {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3vw, 40px);
  align-items: start;
}

.page-about .facts {
  list-style: none;
  margin: clamp(18px, 2.4vw, 26px) 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .facts__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 12px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .facts__k {
  font-size: 13px;
  color: var(--ink-3);
}

.page-about .facts__v {
  font-family: var(--font-mono);
  font-size: 16px;
  font-weight: 700;
  color: var(--gold);
  font-variant-numeric: tabular-nums;
}

/* ---------- 继续了解 ---------- */
.page-about .nextlinks {
  list-style: none;
  margin: clamp(16px, 2.4vw, 26px) 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .nextlinks__row {
  border-bottom: 1px solid var(--line);
}

.page-about .nextlinks__link {
  display: grid;
  grid-template-columns: 1fr;
  gap: 4px;
  padding: 16px 2px;
  text-decoration: none;
  transition: background-color 240ms var(--ease), padding-left 240ms var(--ease);
}

.page-about .nextlinks__link:hover,
.page-about .nextlinks__link:focus-visible {
  background: var(--bg-2);
  padding-left: 12px;
}

.page-about .nextlinks__link:focus-visible {
  outline: 1px solid var(--lime);
  outline-offset: -1px;
}

.page-about .nextlinks__name {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .nextlinks__link:hover .nextlinks__name {
  color: var(--lime);
}

.page-about .nextlinks__desc {
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink-3);
}

/* ---------- 动效 ---------- */
@keyframes about-rise {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: none; }
}

.page-about .about-hero__lead,
.page-about .about-hero__media,
.page-about .about-glance,
.page-about .about-status {
  animation: about-rise 240ms var(--ease) both;
}

.page-about .about-hero__media { animation-delay: 40ms; }
.page-about .about-glance { animation-delay: 80ms; }
.page-about .about-status { animation-delay: 120ms; }

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    animation: none !important;
    transition: none !important;
  }
}

/* ---------- 断点 ---------- */
@media (min-width: 640px) {
  .page-about .about-pillars {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: clamp(20px, 3vw, 40px);
  }

  .page-about .about-pillar {
    padding: 22px 0;
  }
}

@media (min-width: 860px) {
  .page-about {
    --about-axis: 148px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }

  .page-about .about-glance {
    margin-top: clamp(34px, 4vw, 52px);
  }

  .page-about .tl__item {
    gap: 32px;
    padding-bottom: clamp(30px, 3.6vw, 48px);
  }

  .page-about .tl__body {
    padding-left: 24px;
  }

  .page-about .flow {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
  }

  .page-about .audience {
    grid-template-columns: minmax(0, 4fr) minmax(0, 7fr);
  }

  .page-about .nextlinks__link {
    grid-template-columns: minmax(180px, 260px) minmax(0, 1fr);
    align-items: baseline;
    gap: 24px;
  }

  .page-about .section__title {
    max-width: 24ch;
  }
}

@media (min-width: 1180px) {
  .page-about .about-pillars {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    column-gap: clamp(24px, 3vw, 48px);
  }

  .page-about .about-pillar {
    border-bottom: none;
    padding-bottom: 6px;
  }

  .page-about .about-pillars {
    border-bottom: 1px solid var(--line);
    padding-bottom: 22px;
  }
}