.page-about {
  --about-radius: 22px;
  --about-radius-sm: 14px;
  --about-card-shadow: 0 14px 30px rgba(0, 0, 0, 0.22);
  --about-chip-bg: rgba(255, 255, 255, 0.28);
  --about-ink: #4A5468;
  max-width: var(--container);
  margin-inline: auto;
  padding: 0 20px 72px;
}

.page-about > section {
  border-radius: var(--about-radius);
  padding: 28px 20px;
  margin-bottom: 24px;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: var(--text-dim);
  margin-bottom: 14px;
}

.page-about .breadcrumb a {
  color: var(--text-dim);
  text-decoration: none;
}

.page-about .breadcrumb a:hover {
  color: var(--text);
}

.page-about .about-hero .breadcrumb {
  color: rgba(26, 31, 46, 0.62);
}

.page-about .about-hero .breadcrumb a {
  color: rgba(26, 31, 46, 0.78);
}

/* ---------- 首屏封面区 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  background: var(--gradient-heat);
  color: var(--text-invert);
  border-radius: var(--about-radius);
  padding: 34px 22px 30px;
  margin: 24px 0 28px;
}

.page-about .about-hero::before {
  content: '';
  position: absolute;
  right: -70px;
  top: -70px;
  width: 220px;
  height: 220px;
  border-radius: 50%;
  border: 34px solid rgba(255, 255, 255, 0.18);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: '';
  position: absolute;
  right: 34px;
  bottom: -52px;
  width: 110px;
  height: 110px;
  border-radius: 50%;
  border: 20px solid rgba(26, 31, 46, 0.1);
  pointer-events: none;
}

.page-about .about-hero__eyebrow {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 13px;
  letter-spacing: 0.05em;
  color: rgba(26, 31, 46, 0.72);
}

.page-about .about-hero__title {
  margin: 0 0 14px;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(1.5rem, 3.4vw, 2.5rem);
  line-height: 1.22;
  max-width: 18em;
}

.page-about .about-hero__lead {
  margin: 0 0 22px;
  max-width: 48em;
  font-size: 15px;
  line-height: 1.7;
  color: rgba(26, 31, 46, 0.82);
}

.page-about .about-hero__quicklinks {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  position: relative;
  z-index: 1;
}

.page-about .about-hero__chip {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 14px;
  border-radius: 999px;
  background: var(--about-chip-bg);
  border: 1px solid rgba(26, 31, 46, 0.14);
  color: var(--text-invert);
  text-decoration: none;
  font-size: 14px;
  font-weight: 600;
  transition: transform 0.2s ease, background 0.2s ease;
}

.page-about .about-hero__chip strong {
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 700;
}

.page-about .about-hero__chip:hover {
  background: rgba(255, 255, 255, 0.5);
  transform: translateY(-2px);
}

/* ---------- 区块通用标题 ---------- */
.page-about .about-scope__head,
.page-about .about-taxonomy__head,
.page-about .about-batches__head,
.page-about .about-search__head,
.page-about .about-contact__head {
  margin-bottom: 20px;
}

.page-about .about-scope__title,
.page-about .about-taxonomy__title,
.page-about .about-batches__title,
.page-about .about-search__title,
.page-about .about-contact__title {
  margin: 8px 0 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(1.35rem, 3vw, 1.9rem);
  line-height: 1.28;
}

.page-about .about-kicker {
  display: inline-block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 13px;
  letter-spacing: 0.05em;
  padding: 6px 12px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.1);
  color: var(--text);
}

.page-about .about-kicker--dark {
  background: rgba(255, 255, 255, 0.1);
  color: var(--text);
}

.page-about .about-kicker--invert {
  background: rgba(26, 31, 46, 0.16);
  color: var(--text-invert);
}

.page-about .about-taxonomy .about-kicker {
  background: rgba(26, 31, 46, 0.08);
  color: var(--text-invert);
}

/* ---------- 01 收录范围 ---------- */
.page-about .about-scope {
  background: var(--color-panel);
  border: 1px solid var(--border);
  color: var(--text);
}

.page-about .about-scope__grid {
  display: grid;
  gap: 22px;
}

@media (min-width: 880px) {
  .page-about .about-scope__grid {
    grid-template-columns: 5fr 7fr;
    align-items: center;
  }
}

.page-about .about-scope__note p {
  margin: 0 0 12px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--text-dim);
}

.page-about .about-scope__platforms {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

@media (min-width: 640px) {
  .page-about .about-scope__platforms {
    grid-template-columns: repeat(3, 1fr);
  }
}

.page-about .platform-card {
  position: relative;
  display: flex;
  flex-direction: column;
  min-height: 150px;
  border-radius: var(--radius);
  padding: 18px 18px 16px;
  text-decoration: none;
  overflow: hidden;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.page-about .platform-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.page-about .platform-card::after {
  content: '';
  position: absolute;
  right: -32px;
  bottom: -32px;
  width: 110px;
  height: 110px;
  border-radius: 50%;
  border: 16px solid rgba(255, 255, 255, 0.16);
  pointer-events: none;
}

.page-about .platform-card--android {
  background: linear-gradient(135deg, #00C2A8, #00A58F);
  color: #fff;
}

.page-about .platform-card--ios {
  background: linear-gradient(135deg, #9B5CFF, #7B3BFF);
  color: #fff;
}

.page-about .platform-card--tools {
  background: linear-gradient(135deg, #FFD400, #FFC400);
  color: var(--text-invert);
}

.page-about .platform-card__num {
  font-family: var(--font-mono);
  font-size: 2.4rem;
  font-weight: 700;
  line-height: 1;
  margin-bottom: 8px;
}

.page-about .platform-card__name {
  font-family: var(--font-head);
  font-size: 15px;
  font-weight: 700;
}

.page-about .platform-card__range {
  margin-top: auto;
  font-family: var(--font-mono);
  font-size: 12px;
  opacity: 0.86;
}

.page-about .about-scope__statsline {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 18px;
  margin-top: 20px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
  font-size: 14px;
  color: var(--text-dim);
}

.page-about .about-scope__statsline b {
  color: var(--text);
  font-family: var(--font-mono);
}

.page-about .about-scope__statsline a {
  color: var(--color-accent);
  font-weight: 600;
  text-decoration: none;
}

/* ---------- 02 分类与标签体系 ---------- */
.page-about .about-taxonomy {
  background: #fff;
  color: var(--text-invert);
}

.page-about .about-taxonomy__title {
  color: var(--text-invert);
}

.page-about .about-taxonomy__stage {
  display: grid;
  gap: 20px;
  align-items: stretch;
}

@media (min-width: 900px) {
  .page-about .about-taxonomy__stage {
    grid-template-columns: minmax(280px, 5fr) 7fr;
    align-items: center;
  }
}

.page-about .about-taxonomy__figure {
  margin: 0;
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--color-panel);
}

.page-about .about-taxonomy__figure img,
.page-about .about-batches__figure img,
.page-about .about-search__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .tree-level {
  background: var(--color-page);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
}

.page-about .tree-level__label {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--text-dim);
  margin-bottom: 12px;
}

.page-about .tree-platforms {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
}

.page-about .tree-platform {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 6px;
  padding: 10px 12px;
  border-radius: 12px;
  font-size: 14px;
  font-weight: 700;
  color: #fff;
}

.page-about .tree-platform--android {
  background: var(--color-android);
}

.page-about .tree-platform--ios {
  background: var(--color-ios);
}

.page-about .tree-platform--tools {
  background: var(--color-tool);
  color: var(--text-invert);
}

.page-about .tree-platform em {
  font-family: var(--font-mono);
  font-style: normal;
  font-size: 13px;
  opacity: 0.85;
}

.page-about .tree-connector {
  display: block;
  height: 26px;
  position: relative;
}

.page-about .tree-connector::before {
  content: '';
  position: absolute;
  top: 0;
  bottom: 0;
  left: 50%;
  width: 2px;
  background: var(--color-gray);
}

.page-about .tree-connector::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 16%;
  right: 16%;
  height: 2px;
  background: var(--color-gray);
}

.page-about .tree-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .tree-tags .tag {
  font-size: 13px;
  padding: 6px 12px;
  text-decoration: none;
}

.page-about .tree-subtags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .tree-subtag {
  font-size: 12px;
  font-weight: 500;
  padding: 5px 10px;
  border-radius: 999px;
  background: var(--color-panel);
  color: var(--text);
  border: 1px solid var(--border);
}

/* ---------- 03 更新机制与批次 ---------- */
.page-about .about-batches {
  background: linear-gradient(180deg, var(--color-page), #151A26);
  border: 1px solid var(--border);
  color: var(--text);
}

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

@media (min-width: 900px) {
  .page-about .about-batches__layout {
    grid-template-columns: 7fr 5fr;
    align-items: start;
  }

  .page-about .about-batches__side {
    position: sticky;
    top: calc(var(--header-h) + 16px);
  }
}

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

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 18px 34px;
}

.page-about .about-timeline__item::before {
  content: '';
  position: absolute;
  left: 12px;
  top: 12px;
  bottom: -4px;
  width: 2px;
  background: var(--border);
}

.page-about .about-timeline__item:last-child::before {
  display: none;
}

.page-about .about-timeline__dot {
  position: absolute;
  left: 7px;
  top: 8px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--color-gray);
  border: 2px solid var(--color-page);
}

.page-about .about-timeline__item:nth-child(-n+5) .about-timeline__dot {
  background: var(--tag-one);
}

.page-about .about-timeline__item--latest .about-timeline__dot {
  width: 16px;
  height: 16px;
  left: 5px;
  top: 7px;
  background: var(--color-accent);
  border: 3px solid var(--color-page);
  box-shadow: 0 0 0 4px rgba(57, 255, 136, 0.22);
}

.page-about .about-timeline__ver {
  display: inline-block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 14px;
  color: var(--text);
  background: var(--color-panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 2px 8px;
  margin-bottom: 6px;
}

.page-about .about-timeline__item--latest .about-timeline__ver {
  background: var(--color-accent);
  color: var(--text-invert);
  border-color: transparent;
}

.page-about .about-timeline__body {
  display: flex;
  flex-direction: column;
  gap: 2px;
  font-size: 14px;
  line-height: 1.55;
  color: var(--text-dim);
}

.page-about .about-timeline__body strong {
  color: var(--text);
  font-size: 15px;
}

.page-about .about-timeline__item--latest .about-timeline__body strong {
  color: var(--color-accent);
}

.page-about .about-batches__figure {
  margin: 0 0 16px;
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--color-panel);
}

.page-about .about-batches__rhythm {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
  margin-bottom: 16px;
}

.page-about .rhythm-note {
  background: var(--color-panel);
  border: 1px solid var(--border);
  border-radius: var(--about-radius-sm);
  padding: 12px 14px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .rhythm-note__label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--text-dim);
}

.page-about .rhythm-note__value {
  font-size: 18px;
  font-weight: 700;
  color: var(--text);
}

.page-about .about-batches__foot {
  margin: 0;
  padding: 14px;
  border-radius: var(--about-radius-sm);
  background: rgba(57, 255, 136, 0.08);
  border-left: 6px solid var(--color-accent);
  font-size: 14px;
  line-height: 1.65;
  color: var(--text-dim);
}

/* ---------- 04 检索与浏览路径 ---------- */
.page-about .about-search {
  background: linear-gradient(135deg, #FF7A00, #FFB800);
  color: var(--text-invert);
}

.page-about .about-search__title {
  color: var(--text-invert);
}

.page-about .about-search__grid {
  display: grid;
  gap: 14px;
}

@media (min-width: 720px) {
  .page-about .about-search__grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .page-about .about-search__grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

.page-about .search-card {
  background: var(--color-card);
  border-radius: var(--radius);
  border-top: 6px solid var(--color-accent);
  padding: 18px 16px 16px;
  color: var(--text-invert);
  text-decoration: none;
  display: flex;
  flex-direction: column;
  gap: 6px;
  box-shadow: var(--shadow-sm);
  transition: transform 0.2s ease;
}

.page-about .search-card:hover {
  transform: translateY(-3px);
}

.page-about .search-card--fields {
  border-top-color: var(--color-blue);
}

.page-about .search-card--platform {
  border-top-color: var(--color-android);
}

.page-about .search-card--status {
  border-top-color: var(--color-red);
}

.page-about .search-card--tag {
  border-top-color: var(--color-tool);
}

.page-about .search-card__num {
  font-family: var(--font-mono);
  font-size: 2rem;
  font-weight: 700;
  line-height: 1;
}

.page-about .search-card__title {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 15px;
  color: var(--text-invert);
}

.page-about .search-card__desc {
  font-size: 13px;
  line-height: 1.5;
  color: var(--about-ink);
}

.page-about .about-search__figure {
  margin: 18px 0 0;
  border-radius: var(--radius);
  overflow: hidden;
  background: rgba(26, 31, 46, 0.2);
}

/* ---------- 05 反馈与联系 ---------- */
.page-about .about-contact {
  background: var(--color-panel);
  border: 1px solid var(--border);
  color: var(--text);
}

.page-about .about-contact__list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.page-about .contact-channel {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px 16px;
  padding: 16px 18px;
  border-radius: var(--about-radius-sm);
  border: 1px solid var(--border);
  background: var(--color-page);
  color: var(--text);
  text-decoration: none;
  transition: border-color 0.2s ease;
}

.page-about .contact-channel:hover {
  border-color: var(--color-accent);
}

.page-about .contact-channel__label {
  flex: none;
  width: 110px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  color: var(--text-dim);
}

@media (min-width: 640px) {
  .page-about .contact-channel__label {
    width: 140px;
  }
}

.page-about .contact-channel__value {
  flex: 1;
  min-width: 220px;
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 15px;
  color: var(--text);
  word-break: break-all;
}

.page-about .contact-channel__action {
  flex: none;
  font-size: 12px;
  font-weight: 600;
  padding: 6px 12px;
  border-radius: 999px;
  background: var(--color-accent);
  color: var(--text-invert);
}