.page-about {
  --about-gap: clamp(24px, 4vw, 52px);
  --about-pad: clamp(36px, 6vw, 78px);
  background: var(--ink-deep);
  color: var(--silver);
  font-family: var(--font-body);
  overflow-x: clip;
}

.page-about .container {
  width: 100%;
  max-width: var(--max);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

/* ---------- 首屏框景 ---------- */
.page-about .about-hero {
  position: relative;
  margin-top: clamp(10px, 2vw, 20px);
  padding-block: clamp(30px, 5vw, 58px);
  border-block: 1px solid var(--line-soft);
  background:
    radial-gradient(120% 90% at 10% 0%, rgba(52, 211, 200, 0.11), transparent 58%),
    radial-gradient(90% 80% at 94% 18%, rgba(242, 169, 59, 0.09), transparent 62%);
}

.page-about .about-hero::before,
.page-about .about-hero::after {
  content: "";
  position: absolute;
  width: 15px;
  height: 15px;
  border: 1px solid var(--signal);
  opacity: 0.75;
}

.page-about .about-hero::before {
  top: 12px;
  left: 12px;
  border-right: 0;
  border-bottom: 0;
}

.page-about .about-hero::after {
  bottom: 12px;
  right: 12px;
  border-left: 0;
  border-top: 0;
}

.page-about .about-hero__inner {
  display: grid;
  gap: clamp(22px, 3.5vw, 40px);
}

.page-about .about-hero__title {
  margin: 10px 0 16px;
  font-family: var(--font-title);
  font-weight: 900;
  font-size: clamp(30px, 5.4vw, 58px);
  line-height: 1.16;
  letter-spacing: -0.03em;
  color: var(--moon);
}

.page-about .about-hero__lede {
  margin: 0;
  max-width: 38em;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.9;
  color: var(--silver);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: clamp(18px, 3vw, 28px);
}

.page-about .about-meta {
  padding: clamp(14px, 2.4vw, 22px);
  border: 1px solid var(--line);
  border-radius: var(--radius-soft);
  background: var(--ink-glass);
  align-self: start;
}

.page-about .about-meta__title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--signal);
}

.page-about .about-meta__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding-block: 10px;
  border-bottom: 1px dashed var(--line-soft);
}

.page-about .about-meta__row--last {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .about-meta__key {
  font-size: 13px;
  color: var(--orbit);
}

.page-about .about-meta__val {
  font-size: 14px;
  color: var(--moon);
  text-align: right;
}

.page-about .num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.01em;
}

/* ---------- 章节跳转 ---------- */
.page-about .about-jump {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-block: 14px 4px;
  scrollbar-width: thin;
}

.page-about .about-jump a {
  flex: 0 0 auto;
  padding: 7px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 13px;
  color: var(--silver);
  text-decoration: none;
  transition: color 0.25s var(--ease), border-color 0.25s var(--ease), background-color 0.25s var(--ease);
}

.page-about .about-jump a:hover,
.page-about .about-jump a:focus-visible {
  color: var(--ink-deep);
  background: var(--fluoro);
  border-color: var(--fluoro);
  outline: none;
}

/* ---------- 通用章节 ---------- */
.page-about .about-section {
  padding-block: var(--about-pad);
}

.page-about .about-section--nebula {
  background: var(--ink-nebula);
  border-block: 1px solid var(--line-soft);
}

.page-about .about-head {
  max-width: 46em;
  margin-bottom: clamp(22px, 3.5vw, 40px);
}

.page-about .section-title {
  margin: 8px 0 12px;
  font-family: var(--font-title);
  font-weight: 900;
  font-size: clamp(23px, 3.4vw, 36px);
  line-height: 1.24;
  letter-spacing: -0.03em;
  color: var(--moon);
}

.page-about .section-title::after {
  content: "";
  display: block;
  width: 54px;
  height: 2px;
  margin-top: 14px;
  background: linear-gradient(90deg, var(--signal), transparent);
}

.page-about .about-lead {
  margin: 0;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.9;
  color: var(--silver);
}

.page-about .eyebrow {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--signal);
}

.page-about .about-inline-link {
  margin: clamp(16px, 2.5vw, 24px) 0 0;
  font-size: 14px;
  color: var(--orbit);
}

.page-about .link-arrow {
  color: var(--signal);
  text-decoration: none;
  border-bottom: 1px solid var(--signal-soft);
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .link-arrow::after {
  content: " →";
  font-family: var(--font-mono);
}

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

/* ---------- 左右分屏 · 历程 ---------- */
.page-about .about-split {
  display: grid;
  gap: var(--about-gap);
}

.page-about .about-figure {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius-organic);
  overflow: hidden;
  background: var(--ink-nebula);
}

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

.page-about .media__caption {
  padding: 10px 14px 12px;
  font-size: 12px;
  line-height: 1.7;
  color: var(--orbit);
  border-top: 1px solid var(--line-soft);
}

.page-about .timeline {
  list-style: none;
  margin: clamp(18px, 3vw, 28px) 0 0;
  padding: 0;
}

.page-about .timeline__item {
  position: relative;
  padding: 0 0 clamp(20px, 3vw, 32px) clamp(20px, 3vw, 30px);
  border-left: 1px solid var(--line);
}

.page-about .timeline__item:last-child {
  padding-bottom: 0;
  border-left-color: transparent;
}

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 8px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--ink-deep);
  border: 1px solid var(--signal);
  box-shadow: 0 0 0 4px rgba(52, 211, 200, 0.1);
}

.page-about .timeline__year {
  display: inline-block;
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--signal);
}

.page-about .timeline__title {
  margin: 4px 0 6px;
  font-family: var(--font-title);
  font-weight: 800;
  font-size: clamp(17px, 2.3vw, 21px);
  line-height: 1.4;
  letter-spacing: -0.02em;
  color: var(--moon);
}

.page-about .timeline__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--silver);
}

/* ---------- 服务方法 ---------- */
.page-about .method-grid {
  display: grid;
  gap: 14px;
  grid-template-columns: minmax(0, 1fr);
}

.page-about .method-step {
  position: relative;
  padding: clamp(18px, 2.6vw, 26px);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-soft);
  background: rgba(11, 16, 38, 0.55);
  transition: border-color 0.28s var(--ease), transform 0.28s var(--ease);
}

.page-about .method-step:hover {
  border-color: var(--signal);
  transform: translateY(-3px);
}

.page-about .method-step__no {
  display: block;
  font-size: 24px;
  color: var(--amber);
  letter-spacing: 0.04em;
}

.page-about .method-step__title {
  margin: 8px 0 8px;
  font-family: var(--font-title);
  font-weight: 800;
  font-size: 18px;
  line-height: 1.45;
  color: var(--moon);
  letter-spacing: -0.02em;
}

.page-about .method-step__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--silver);
}

/* ---------- 团队 ---------- */
.page-about .about-figure--wide {
  margin-bottom: clamp(18px, 3vw, 28px);
  border-radius: var(--radius-soft);
}

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

.page-about .team-card {
  padding: clamp(18px, 2.6vw, 24px);
  border: 1px solid var(--line-soft);
  border-left: 2px solid var(--orbit);
  border-radius: 4px var(--radius-soft) var(--radius-soft) 4px;
  background: var(--ink-nebula);
  transition: border-left-color 0.28s var(--ease), background-color 0.28s var(--ease);
}

.page-about .team-card:hover,
.page-about .team-card:focus-within {
  border-left-color: var(--fluoro);
  background: #16204a;
}

.page-about .team-card__city {
  margin: 0 0 8px;
  font-family: var(--font-title);
  font-weight: 900;
  font-size: 20px;
  letter-spacing: -0.01em;
  color: var(--moon);
}

.page-about .team-card__role {
  margin: 0 0 12px;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--silver);
}

.page-about .team-card__meta {
  margin: 0;
  padding-top: 10px;
  border-top: 1px dashed var(--line-soft);
  font-size: 13px;
  color: var(--orbit);
}

.page-about .team-card__meta .num {
  color: var(--amber);
  font-size: 15px;
}

/* ---------- 覆盖范围 ---------- */
.page-about .about-coverage {
  background-color: var(--ink-nebula);
  background-image:
    linear-gradient(var(--line-soft) 1px, transparent 1px),
    linear-gradient(90deg, var(--line-soft) 1px, transparent 1px);
  background-size: 56px 56px;
  border-block: 1px solid var(--line-soft);
}

.page-about .coverage-grid {
  display: grid;
  gap: var(--about-gap);
}

.page-about .coverage-list {
  list-style: none;
  margin: clamp(18px, 3vw, 26px) 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .coverage-list li {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line-soft);
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--silver);
}

.page-about .coverage-list__num {
  flex: 0 0 auto;
  min-width: 2.2em;
  font-size: 26px;
  line-height: 1;
  color: var(--signal);
}

.page-about .about-figure--grid {
  background: rgba(11, 16, 38, 0.55);
}

/* ---------- 可信度（月白区块） ---------- */
.page-about .about-trust {
  padding-block: var(--about-pad);
  background: var(--moon);
  color: var(--ink-deep);
}

.page-about .about-head--dark .section-title {
  color: var(--ink-deep);
}

.page-about .about-head--dark .section-title::after {
  background: linear-gradient(90deg, var(--amber-deep), transparent);
}

.page-about .about-head--dark .eyebrow--dark {
  color: var(--amber-deep);
}

.page-about .about-lead--dark {
  color: #333c58;
}

.page-about .trust-stats {
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.page-about .trust-stat {
  padding: clamp(14px, 2.2vw, 22px);
  border: 1px solid rgba(11, 16, 38, 0.16);
  border-top: 2px solid var(--amber);
  border-radius: var(--radius-soft);
  background: #ffffff;
}

.page-about .trust-stat__num {
  margin: 0 0 6px;
  font-size: clamp(26px, 3.6vw, 38px);
  line-height: 1.1;
  color: var(--ink-deep);
}

.page-about .trust-stat__num span {
  font-size: 0.5em;
  margin-left: 2px;
  color: var(--amber-deep);
}

.page-about .trust-stat__label {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: #4a5573;
}

.page-about .trust-note {
  margin: clamp(18px, 3vw, 26px) 0 0;
  font-size: 14px;
  line-height: 1.85;
  color: #3b4560;
}

.page-about .trust-note .link-arrow {
  color: var(--amber-deep);
  border-bottom-color: rgba(184, 116, 26, 0.4);
}

.page-about .trust-note .link-arrow:hover,
.page-about .trust-note .link-arrow:focus-visible {
  color: var(--ink-deep);
  border-bottom-color: var(--ink-deep);
}

/* ---------- 星图语言 ---------- */
.page-about .language-grid {
  display: grid;
  gap: var(--about-gap);
}

.page-about .language-grid__body .about-lead + .about-lead {
  margin-top: 14px;
}

.page-about .language-figure {
  padding: clamp(18px, 3vw, 30px);
  border: 1px solid var(--line);
  border-radius: var(--radius-organic);
  background: linear-gradient(160deg, rgba(52, 211, 200, 0.1), rgba(11, 16, 38, 0.9) 60%);
}

.page-about .language-figure__num {
  margin: 0 0 6px;
  font-size: clamp(32px, 5vw, 48px);
  line-height: 1.05;
  color: var(--fluoro);
}

.page-about .language-figure__label {
  margin: 0 0 clamp(16px, 2.5vw, 24px);
  font-size: 14px;
  line-height: 1.8;
  color: var(--silver);
}

.page-about .language-figure__bar-label {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--orbit);
}

.page-about .language-figure__track {
  display: block;
  height: 8px;
  border-radius: 999px;
  background: rgba(92, 107, 138, 0.3);
  overflow: hidden;
}

.page-about .language-figure__fill {
  display: block;
  width: 60%;
  height: 100%;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--signal), var(--fluoro));
}

.page-about .language-figure__hint {
  margin: 14px 0 0;
  font-size: 13px;
  line-height: 1.75;
  color: var(--orbit);
}

/* ---------- 收束 ---------- */
.page-about .about-cta {
  padding-block: clamp(32px, 5vw, 60px);
  border-top: 1px solid var(--line);
  background: var(--ink-nebula);
}

.page-about .about-cta__inner {
  display: grid;
  gap: 20px;
}

.page-about .about-cta__title {
  margin: 0 0 8px;
  font-family: var(--font-title);
  font-weight: 900;
  font-size: clamp(21px, 3vw, 30px);
  letter-spacing: -0.03em;
  color: var(--moon);
}

.page-about .about-cta__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--silver);
}

.page-about .about-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .btn {
  display: inline-block;
  padding: 11px 20px;
  border-radius: 999px;
  border: 1px solid transparent;
  font-size: 14px;
  text-decoration: none;
  transition: transform 0.24s var(--ease), background-color 0.24s var(--ease), color 0.24s var(--ease), border-color 0.24s var(--ease);
}

.page-about .btn--signal {
  background: var(--signal);
  color: var(--ink-deep);
  font-weight: 700;
}

.page-about .btn--signal:hover,
.page-about .btn--signal:focus-visible {
  background: var(--fluoro);
  transform: translateY(-2px);
}

.page-about .btn--ghost {
  border-color: var(--line);
  color: var(--silver);
}

.page-about .btn--ghost:hover,
.page-about .btn--ghost:focus-visible {
  border-color: var(--fluoro);
  color: var(--fluoro);
  transform: translateY(-2px);
}

/* ---------- 断点 ---------- */
@media (min-width: 700px) {
  .page-about .method-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 0.75fr);
    align-items: start;
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 0.82fr) minmax(0, 1.18fr);
    align-items: start;
  }

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

  .page-about .coverage-grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: center;
  }

  .page-about .language-grid {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 0.75fr);
    align-items: start;
  }

  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 28px;
  }

  .page-about .about-cta__links {
    justify-content: flex-end;
  }
}

@media (min-width: 1080px) {
  .page-about .method-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .method-step,
  .page-about .team-card,
  .page-about .btn,
  .page-about .about-jump a {
    transition: none;
  }

  .page-about .method-step:hover,
  .page-about .btn:hover {
    transform: none;
  }
}