.page-about {
  --ab-num: 64px;
  overflow-x: hidden;
}

/* ---------- 首屏刊头 ---------- */
.page-about .about-hero {
  position: relative;
  padding: 36px 0 44px;
  border-bottom: var(--edge);
  background:
    radial-gradient(120% 130% at 78% -18%, rgba(53, 224, 210, 0.12), transparent 58%),
    linear-gradient(180deg, var(--ink-900), var(--ink-950));
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  right: -8%;
  bottom: -56%;
  width: 340px;
  height: 340px;
  background: linear-gradient(140deg, rgba(53, 224, 210, 0.16), transparent 68%);
  transform: rotate(16deg);
  pointer-events: none;
}

.page-about .about-hero .wrap {
  position: relative;
  z-index: 1;
  text-align: center;
}

.page-about .breadcrumb {
  display: flex;
  justify-content: center;
  margin: 0 0 22px;
}

.page-about .breadcrumb ul {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.08em;
  color: var(--mist-200);
}

.page-about .breadcrumb a {
  color: var(--mist-200);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  color: var(--cyan-400);
  border-bottom-color: var(--cyan-400);
}

.page-about .about-hero__eyebrow {
  margin: 0 0 14px;
  font-size: 0.76rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--cyan-400);
}

.page-about .about-hero__title {
  margin: 0 auto 18px;
  max-width: 20ch;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.85rem, 5.4vw, 3.1rem);
  line-height: 1.14;
  letter-spacing: 0.01em;
  color: var(--white-050);
}

.page-about .about-hero__lede {
  max-width: 58ch;
  margin: 0 auto;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--mist-200);
}

.page-about .about-hero__stats {
  display: grid;
  gap: 1px;
  max-width: 760px;
  margin: 32px auto 0;
  padding: 0;
  list-style: none;
  background: var(--hairline);
  border: var(--edge);
  text-align: left;
}

.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 16px;
  background: var(--ink-900);
}

.page-about .about-stat__num {
  font-size: 1.85rem;
  font-weight: 700;
  line-height: 1;
  color: var(--cyan-400);
}

.page-about .about-stat__label {
  font-size: 0.82rem;
  line-height: 1.55;
  color: var(--mist-200);
}

/* ---------- 主题带 ---------- */
.page-about .about-band {
  border-bottom: var(--edge);
  background: linear-gradient(90deg, var(--ink-900), var(--ink-800) 58%, var(--violet-700));
}

.page-about .about-band__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 24px;
  min-height: 88px;
  padding-top: 18px;
  padding-bottom: 18px;
}

.page-about .about-band__text {
  margin: 0;
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  color: var(--mist-200);
}

.page-about .about-band__link {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  color: var(--cyan-200);
  text-decoration: none;
  border-bottom: 1px solid var(--violet-600);
  padding-bottom: 3px;
}

.page-about .about-band__link:hover,
.page-about .about-band__link:focus-visible {
  color: var(--cyan-400);
  border-bottom-color: var(--cyan-400);
}

/* ---------- 通用章节 ---------- */
.page-about .about-block {
  padding: 48px 0;
  border-bottom: 1px solid var(--hairline);
}

.page-about .about-block:last-of-type {
  border-bottom: 0;
}

.page-about .about-block__head {
  display: grid;
  grid-template-columns: 48px minmax(0, 1fr);
  gap: 8px 14px;
  align-items: baseline;
  padding-top: 16px;
  margin-bottom: 30px;
  border-top: 2px solid var(--violet-700);
}

.page-about .about-block__num {
  font-size: 0.92rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--cyan-400);
}

.page-about .about-block__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.3rem, 3.6vw, 1.95rem);
  line-height: 1.22;
  color: var(--white-050);
}

.page-about .about-block__note {
  grid-column: 1 / -1;
  margin: 0;
  font-size: 0.74rem;
  letter-spacing: 0.1em;
  color: var(--gold-400);
}

/* ---------- 01 双栏 ---------- */
.page-about .about-split {
  display: grid;
  gap: 26px;
}

.page-about .about-pull {
  margin: 0;
  padding-left: 16px;
  border-left: 2px solid var(--cyan-400);
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 600;
  line-height: 1.55;
  color: var(--cyan-200);
}

.page-about .about-split__main p {
  max-width: 64ch;
  margin: 0 0 18px;
  font-size: 0.98rem;
  line-height: 1.85;
  color: var(--mist-200);
}

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

/* ---------- 媒体占位 ---------- */
.page-about .about-media {
  position: relative;
  overflow: hidden;
  border: var(--edge);
  background: var(--ink-900);
}

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

.page-about .about-media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(205deg, rgba(53, 224, 210, 0.14), transparent 56%);
  pointer-events: none;
}

.page-about .about-media--wide {
  aspect-ratio: 16 / 6;
}

.page-about .about-media--square {
  aspect-ratio: 1 / 1;
}

/* ---------- 02 服务线 ---------- */
.page-about .about-lines__media {
  margin-bottom: 32px;
}

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

.page-about .line-card {
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 22px 20px;
  background: var(--ink-800);
  border: var(--edge);
  box-shadow: var(--shadow-1);
  transition: transform var(--fast) ease-out, box-shadow var(--fast) ease-out, border-color var(--fast) ease-out;
}

.page-about .line-card:hover,
.page-about .line-card:focus-within {
  transform: translate(-2px, -2px);
  box-shadow: var(--shadow-2);
  border-color: var(--cyan-400);
}

.page-about .line-card__idx {
  align-self: flex-start;
  padding: 3px 9px;
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: var(--gold-400);
  border: 1px solid var(--violet-700);
}

.page-about .line-card__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.22rem;
  font-weight: 700;
  color: var(--white-050);
}

.page-about .line-card__text {
  margin: 0;
  font-size: 0.93rem;
  line-height: 1.78;
  color: var(--mist-200);
}

.page-about .line-card__list {
  display: grid;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 0.85rem;
  color: var(--mist-200);
}

.page-about .line-card__list li {
  position: relative;
  padding-left: 16px;
  line-height: 1.62;
}

.page-about .line-card__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.58em;
  width: 6px;
  height: 6px;
  background: var(--cyan-400);
}

.page-about .line-card__link {
  align-self: flex-start;
  margin-top: auto;
  padding-bottom: 3px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  color: var(--cyan-200);
  text-decoration: none;
  border-bottom: 1px solid var(--violet-600);
}

.page-about .line-card__link:hover,
.page-about .line-card__link:focus-visible {
  color: var(--cyan-400);
  border-bottom-color: var(--cyan-400);
}

/* ---------- 03 版本主线 ---------- */
.page-about .version-media {
  margin-bottom: 34px;
}

.page-about .version-intro {
  max-width: 62ch;
  margin: 0 0 34px;
  font-size: 0.97rem;
  line-height: 1.85;
  color: var(--mist-200);
}

.page-about .version-rail {
  display: grid;
  gap: 26px;
  margin: 0;
  padding: 0;
  list-style: none;
  position: relative;
}

.page-about .version-node {
  position: relative;
  padding-top: 34px;
}

.page-about .version-node::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 20px;
  height: 20px;
  background: var(--ink-950);
  border: 2px solid var(--violet-600);
}

.page-about .version-node:last-child::before {
  background: var(--cyan-400);
  border-color: var(--cyan-400);
  box-shadow: 0 0 0 4px rgba(53, 224, 210, 0.16);
}

.page-about .version-node__tag {
  display: inline-block;
  margin-bottom: 10px;
  font-size: 0.84rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--gold-400);
}

.page-about .version-node__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 1.12rem;
  font-weight: 700;
  color: var(--white-050);
}

.page-about .version-node__text {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.78;
  color: var(--mist-200);
}

.page-about .version-node__meta {
  margin: 12px 0 0;
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  color: var(--cyan-200);
  opacity: 0.6;
  transition: opacity var(--fast) ease-out;
}

.page-about .version-node:hover .version-node__meta,
.page-about .version-node:focus-within .version-node__meta {
  opacity: 1;
}

/* ---------- 04 团队 ---------- */
.page-about .team-grid {
  display: grid;
  gap: 22px;
}

.page-about .team-card {
  padding: 22px 20px;
  background: linear-gradient(180deg, var(--ink-800), var(--ink-900));
  border: 2px solid var(--violet-700);
  box-shadow: var(--shadow-1);
  transition: transform var(--fast) ease-out, box-shadow var(--fast) ease-out, border-color var(--base) ease-out;
}

.page-about .team-card:hover,
.page-about .team-card:focus-within,
.page-about .team-card:focus-visible {
  border-color: var(--cyan-400);
  transform: translate(-2px, -2px);
  box-shadow: var(--shadow-2);
}

.page-about .team-card__idx {
  display: inline-block;
  margin-bottom: 10px;
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  color: var(--gold-400);
}

.page-about .team-card__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--white-050);
}

.page-about .team-card__text {
  margin: 0 0 14px;
  font-size: 0.9rem;
  line-height: 1.76;
  color: var(--mist-200);
}

.page-about .team-card__list {
  display: grid;
  gap: 7px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 0.84rem;
  color: var(--mist-200);
}

.page-about .team-card__list li {
  position: relative;
  padding-left: 15px;
  line-height: 1.6;
}

.page-about .team-card__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.56em;
  width: 6px;
  height: 6px;
  border: 1px solid var(--cyan-400);
}

.page-about .team-note {
  max-width: 62ch;
  margin: 28px 0 0;
  padding-left: 16px;
  border-left: 2px solid var(--violet-600);
  font-size: 0.92rem;
  line-height: 1.8;
  color: var(--mist-200);
}

/* ---------- 05 维护节奏 ---------- */
.page-about .care-grid {
  display: grid;
  gap: 28px;
}

.page-about .care-stats {
  display: grid;
  gap: 0;
  margin: 0 0 24px;
  padding: 0;
  list-style: none;
}

.page-about .care-stats li {
  display: grid;
  grid-template-columns: 84px minmax(0, 1fr);
  gap: 16px;
  align-items: baseline;
  padding: 15px 0;
  border-bottom: 1px solid var(--hairline);
}

.page-about .care-stats li:first-child {
  border-top: 1px solid var(--hairline);
}

.page-about .care-stats__num {
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--cyan-400);
  line-height: 1.2;
}

.page-about .care-stats__label {
  font-size: 0.9rem;
  line-height: 1.68;
  color: var(--mist-200);
}

.page-about .care-text {
  max-width: 58ch;
  margin: 0 0 20px;
  font-size: 0.94rem;
  line-height: 1.82;
  color: var(--mist-200);
}

.page-about .care-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 24px;
}

.page-about .about-link {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.06em;
  color: var(--cyan-200);
  text-decoration: none;
  border-bottom: 1px solid var(--violet-600);
  padding-bottom: 3px;
}

.page-about .about-link:hover,
.page-about .about-link:focus-visible {
  color: var(--cyan-400);
  border-bottom-color: var(--cyan-400);
}

/* ---------- 06 覆盖与联络 ---------- */
.page-about .coverage {
  display: grid;
  gap: 30px;
}

.page-about .coverage__lede {
  max-width: 60ch;
  margin: 0 0 26px;
  font-size: 0.97rem;
  line-height: 1.85;
  color: var(--mist-200);
}

.page-about .coverage__main .panel {
  margin-bottom: 10px;
  border: var(--edge);
  background: var(--ink-800);
}

.page-about .panel__summary {
  padding: 14px 16px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.05em;
  color: var(--white-050);
}

.page-about .panel__summary::-webkit-details-marker {
  display: none;
}

.page-about .panel__summary:hover {
  color: var(--cyan-200);
}

.page-about .panel__body {
  padding: 0 16px 16px;
  font-size: 0.9rem;
  line-height: 1.78;
  color: var(--mist-200);
}

.page-about .panel__body p {
  margin: 0;
}

.page-about .coverage__cta {
  max-width: 58ch;
  margin: 22px 0 0;
  font-size: 0.92rem;
  line-height: 1.8;
  color: var(--mist-200);
}

.page-about .coverage__side {
  padding: 22px 20px;
  background: var(--ink-900);
  border: var(--edge);
  box-shadow: var(--shadow-1);
}

.page-about .coverage__side-title {
  margin: 0 0 16px;
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--white-050);
}

.page-about .quick-links {
  display: grid;
  gap: 2px;
  margin: 0 0 18px;
  padding: 0;
  list-style: none;
}

.page-about .quick-links li {
  border-bottom: 1px solid var(--hairline);
}

.page-about .quick-links a {
  display: flex;
  align-items: center;
  gap: 14px;
  min-height: 44px;
  padding: 8px 0;
  font-size: 0.9rem;
  color: var(--mist-200);
  text-decoration: none;
  transition: color var(--fast) ease-out, padding-left var(--fast) ease-out;
}

.page-about .quick-links a span {
  min-width: 52px;
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--gold-400);
}

.page-about .quick-links a:hover,
.page-about .quick-links a:focus-visible {
  color: var(--cyan-200);
  padding-left: 4px;
}

.page-about .coverage__side-note {
  margin: 0;
  font-size: 0.84rem;
  line-height: 1.72;
  color: var(--mist-200);
}

/* ---------- 底部信息条 ---------- */
.page-about .about-strip {
  border-top: var(--edge);
  border-bottom: var(--edge);
  background: linear-gradient(90deg, var(--ink-900), var(--violet-700));
}

.page-about .about-strip__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 24px;
  padding-top: 20px;
  padding-bottom: 20px;
}

.page-about .about-strip__text {
  margin: 0;
  font-size: 0.76rem;
  letter-spacing: 0.1em;
  color: var(--mist-200);
}

.page-about .about-strip__link {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  color: var(--white-050);
  text-decoration: none;
  border-bottom: 1px solid rgba(242, 245, 255, 0.4);
  padding-bottom: 3px;
}

.page-about .about-strip__link:hover,
.page-about .about-strip__link:focus-visible {
  color: var(--cyan-400);
  border-bottom-color: var(--cyan-400);
}

/* ---------- 焦点可见 ---------- */
.page-about a:focus-visible,
.page-about summary:focus-visible,
.page-about .team-card:focus-visible {
  outline: 2px solid var(--cyan-400);
  outline-offset: 2px;
}

/* ---------- 中屏 ---------- */
@media (min-width: 680px) {
  .page-about .about-hero {
    padding: 48px 0 56px;
  }

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

  .page-about .about-block {
    padding: 56px 0;
  }

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

  .page-about .care-stats li {
    grid-template-columns: 108px minmax(0, 1fr);
  }
}

/* ---------- 桌面端 ---------- */
@media (min-width: 960px) {
  .page-about .about-hero {
    padding: 64px 0 68px;
  }

  .page-about .about-block {
    padding: 64px 0;
  }

  .page-about .about-block__head {
    grid-template-columns: var(--ab-num) minmax(0, 1fr) auto;
    gap: 20px;
    margin-bottom: 40px;
  }

  .page-about .about-block__note {
    grid-column: auto;
    text-align: right;
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
    gap: 48px;
  }

  .page-about .lines-grid {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    gap: 24px;
  }

  .page-about .line-card:nth-child(1) {
    grid-column: span 5;
  }

  .page-about .line-card:nth-child(2) {
    grid-column: span 4;
  }

  .page-about .line-card:nth-child(3) {
    grid-column: span 3;
  }

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

  .page-about .version-rail::before {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    top: 9px;
    height: 2px;
    background: repeating-linear-gradient(90deg, rgba(166, 245, 238, 0.3) 0 10px, transparent 10px 18px);
    pointer-events: none;
  }

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

  .page-about .care-grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 48px;
    align-items: start;
  }

  .page-about .coverage {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 48px;
    align-items: start;
  }

  .page-about .about-strip__inner {
    padding-top: 22px;
    padding-bottom: 22px;
  }
}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .line-card,
  .page-about .team-card,
  .page-about .version-node__meta,
  .page-about .quick-links a {
    transition: none;
  }

  .page-about .line-card:hover,
  .page-about .line-card:focus-within,
  .page-about .team-card:hover,
  .page-about .team-card:focus-within,
  .page-about .quick-links a:hover,
  .page-about .quick-links a:focus-visible {
    transform: none;
    padding-left: 0;
  }

  .page-about .version-node__meta {
    opacity: 1;
  }
}