.page-about {
  --about-gap: clamp(16px, 2.4vw, 32px);
  --about-gap-lg: clamp(26px, 4.6vw, 68px);
}

.page-about .about-hero {
  padding-top: clamp(8px, 2vw, 24px);
}

.page-about .about-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap-lg);
  align-items: start;
}

.page-about .about-hero-main {
  min-width: 0;
}

.page-about .about-hero h1 {
  margin: 14px 0 0;
  font-size: clamp(1.95rem, 5.4vw, 3.9rem);
  line-height: 1.1;
  font-weight: 800;
  letter-spacing: -0.012em;
  color: var(--cream);
}

.page-about .about-hero .lede {
  margin-top: clamp(14px, 2vw, 20px);
  max-width: 46ch;
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 3vw, 32px);
}

.page-about .about-hero-aside {
  min-width: 0;
}

.page-about .about-badge {
  position: relative;
  padding: clamp(20px, 2.6vw, 30px);
}

.page-about .about-badge-tag {
  position: absolute;
  top: -11px;
  right: 16px;
  padding: 3px 10px;
  background: var(--orange);
  color: var(--ink);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  border-radius: var(--radius);
}

.page-about .about-badge-status {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 20px;
  font-size: 0.78rem;
  letter-spacing: 0.05em;
  color: var(--silver);
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 14px;
  margin: 0;
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

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

.page-about .about-stat dt {
  margin-bottom: 6px;
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  color: var(--mid);
}

.page-about .about-stat dd {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin: 0;
  color: var(--cream);
}

.page-about .about-stat-num {
  font-size: clamp(1.4rem, 3.2vw, 1.95rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--cyan);
}

.page-about .about-stat-unit {
  font-size: 0.76rem;
  line-height: 1.3;
  color: var(--mid);
}

/* 目录 */
.page-about .about-toc {
  position: static;
  display: block;
  margin-top: var(--about-gap-lg);
  padding: 16px 0 14px;
  background: none;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .about-toc-label {
  margin: 0 0 12px;
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  color: var(--mid);
}

.page-about .about-toc-list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 22px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-toc-link {
  display: inline-block;
  padding: 4px 0;
  font-family: var(--mono);
  font-size: 0.8rem;
  letter-spacing: 0.03em;
  color: var(--mid);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.page-about .about-toc-link:hover {
  color: var(--silver);
}

.page-about .about-toc-link.is-active,
.page-about .about-toc-link[aria-current] {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

/* 章节通用 */
.page-about .about-sec {
  scroll-margin-top: 84px;
}

.page-about .about-sec-head {
  margin-bottom: clamp(18px, 2.8vw, 32px);
}

.page-about .about-sec-head h2 {
  margin: 10px 0 0;
  font-size: clamp(1.45rem, 3.4vw, 2.35rem);
  line-height: 1.18;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--cream);
}

.page-about .about-sec-head .eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.page-about .about-sec-head .eyebrow::before {
  content: "";
  width: 16px;
  height: 1px;
  background: var(--cyan);
}

.page-about .about-sec-head .lede {
  margin-top: 12px;
  max-width: 60ch;
}

.page-about .about-note {
  margin: clamp(16px, 2.4vw, 24px) 0 0;
  font-size: 0.86rem;
  line-height: 1.68;
  color: var(--mid);
}

.page-about .about-note a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(31, 224, 207, 0.35);
}

.page-about .about-note a:hover {
  border-bottom-color: var(--cyan);
}

/* 两栏带图 */
.page-about .about-band {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap-lg);
  align-items: start;
}

.page-about .about-band-main {
  min-width: 0;
}

.page-about .about-fig {
  margin: 0;
}

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

.page-about .about-cap {
  margin: 12px 0 0;
  font-size: 0.76rem;
  line-height: 1.6;
  letter-spacing: 0.03em;
  color: var(--mid);
}

/* 编号条目 */
.page-about .about-rows {
  display: grid;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-row {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  gap: 12px;
  padding: 16px 0;
  border-top: 1px solid var(--line);
}

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

.page-about .about-rows--wide .about-row {
  grid-template-columns: 62px minmax(0, 1fr);
  padding: 20px 0;
}

.page-about .about-row-num {
  padding-top: 4px;
  font-size: 0.86rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--orange);
}

.page-about .about-row-body {
  min-width: 0;
}

.page-about .about-row-title {
  margin: 0 0 5px;
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.4;
  color: var(--cream);
}

.page-about .about-row-desc {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.68;
  color: var(--silver);
}

/* 服务落点刻度表 */
.page-about .about-scope-list {
  display: grid;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
  border-left: 2px solid var(--line);
}

.page-about .about-scope-list li {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding: 16px 0 16px 18px;
}

.page-about .about-scope-list li::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 24px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--cyan);
}

.page-about .about-scope-key {
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--cyan);
}

.page-about .about-scope-val {
  font-size: 0.94rem;
  line-height: 1.7;
  color: var(--silver);
}

/* 团队分工 */
.page-about .about-team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .about-team-card {
  position: relative;
  padding: clamp(18px, 2.4vw, 28px);
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.page-about .about-team-card--cream {
  background: var(--cream);
  border-color: #d9cfbd;
  color: var(--ink);
}

.page-about .about-team-card--accent {
  border-color: rgba(255, 106, 43, 0.45);
}

.page-about .about-team-tag {
  margin: 0;
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  color: var(--mid);
}

.page-about .about-team-card--cream .about-team-tag {
  color: #7c7262;
}

.page-about .about-team-num {
  display: flex;
  align-items: baseline;
  gap: 6px;
  margin: 10px 0 16px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--line);
}

.page-about .about-team-card--cream .about-team-num {
  border-bottom-color: #d9cfbd;
}

.page-about .about-team-num .mono {
  font-size: clamp(2.2rem, 5.4vw, 3.2rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--cyan);
}

.page-about .about-team-card--accent .about-team-num .mono {
  color: var(--orange);
}

.page-about .about-team-card--cream .about-team-num .mono {
  color: #c9500f;
}

.page-about .about-team-unit {
  font-size: 0.82rem;
  color: var(--mid);
}

.page-about .about-team-card--cream .about-team-unit {
  color: #7c7262;
}

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

.page-about .about-team-list li {
  position: relative;
  padding-left: 15px;
  font-size: 0.9rem;
  line-height: 1.66;
  color: var(--silver);
}

.page-about .about-team-card--cream .about-team-list li {
  color: #453e34;
}

.page-about .about-team-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 6px;
  height: 1px;
  background: var(--cyan);
}

.page-about .about-team-card--cream .about-team-list li::before {
  background: #c9500f;
}

/* 版本时间线 */
.page-about .about-timeline {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
  margin: clamp(20px, 3vw, 34px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-tl-item {
  position: relative;
  padding-top: 24px;
}

.page-about .about-tl-item::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--line);
}

.page-about .about-tl-item::after {
  content: "";
  position: absolute;
  top: -4px;
  left: 0;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--mid);
}

.page-about .about-tl-item--now::after {
  background: var(--orange);
  box-shadow: 0 0 0 4px rgba(255, 106, 43, 0.16);
}

.page-about .about-tl-ver {
  margin: 0;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--mid);
}

.page-about .about-tl-item--now .about-tl-ver {
  color: var(--orange);
}

.page-about .about-tl-title {
  margin: 8px 0 8px;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--cream);
}

.page-about .about-tl-desc {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--silver);
}

/* 长期支持 */
.page-about .about-gain-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .about-gain-card {
  position: relative;
  padding: clamp(18px, 2.2vw, 26px);
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: border-color 0.18s var(--ease), transform 0.18s var(--ease);
}

.page-about .about-gain-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 34px;
  height: 2px;
  background: var(--cyan);
}

.page-about .about-gain-card h3 {
  margin: 0 0 9px;
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--cream);
}

.page-about .about-gain-card p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--silver);
}

.page-about .about-gain-card:hover {
  border-color: #2c3742;
  transform: translateY(-2px);
}

.page-about .about-links {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
  margin-top: clamp(24px, 3.4vw, 38px);
}

.page-about .about-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 16px;
  background: rgba(18, 22, 26, 0.72);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--silver);
  font-size: 0.9rem;
  font-weight: 500;
  text-decoration: none;
  transition: border-color 0.18s var(--ease), color 0.18s var(--ease), background 0.18s var(--ease);
}

.page-about .about-link .mono {
  font-size: 0.82rem;
  color: var(--mid);
}

.page-about .about-link:hover {
  border-color: var(--cyan);
  color: var(--cream);
  background: rgba(31, 224, 207, 0.07);
}

.page-about .about-link:hover .mono {
  color: var(--cyan);
}

@media (min-width: 760px) {
  .page-about .about-team-grid {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 1fr) minmax(0, 0.94fr);
    gap: clamp(12px, 1.8vw, 20px);
  }

  .page-about .about-gain-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
  }

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

@media (min-width: 880px) {
  .page-about .about-band {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  }

  .page-about .about-band--flip {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
  }

  .page-about .about-band--flip > .about-fig {
    order: -1;
  }

  .page-about .about-timeline {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0;
  }

  .page-about .about-tl-item {
    padding: 26px 22px 8px 0;
  }

  .page-about .about-tl-item + .about-tl-item {
    padding-left: 22px;
  }

  .page-about .about-tl-item + .about-tl-item::before {
    left: 0;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: clamp(24px, 4vw, 64px);
  }
}

@media (min-width: 1000px) {
  .page-about .about-links {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-toc-link,
  .page-about .about-link,
  .page-about .about-gain-card {
    transition: none;
  }

  .page-about .about-gain-card:hover {
    transform: none;
  }
}