.page-about {
  --about-hair: rgba(138, 151, 168, 0.16);
  --about-hair-strong: rgba(138, 151, 168, 0.26);
  --about-body: rgba(230, 236, 245, 0.76);
  --about-body-dim: rgba(230, 236, 245, 0.62);
  background-color: var(--ink-900);
  color: var(--snow);
  font-family: var(--font-sans);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(104px, 13vw, 168px) 0 clamp(48px, 6vw, 80px);
  border-bottom: 1px solid var(--about-hair);
  background:
    radial-gradient(115% 90% at 84% -6%, rgba(255, 77, 154, 0.16), transparent 62%),
    radial-gradient(85% 75% at 4% 18%, rgba(184, 167, 255, 0.13), transparent 64%),
    linear-gradient(180deg, var(--ink-900) 0%, var(--ink-800) 100%);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, var(--about-hair) 1px, transparent 1px),
    linear-gradient(to bottom, var(--about-hair) 1px, transparent 1px);
  background-size: 72px 72px;
  opacity: 0.55;
  pointer-events: none;
}

.page-about .about-hero > .shell {
  position: relative;
  z-index: 1;
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(32px, 5vw, 56px);
  margin-top: clamp(28px, 4vw, 46px);
}

.page-about .about-hero__title {
  margin: 0 0 20px;
  font-size: clamp(29px, 4.4vw, 54px);
  line-height: 1.16;
  letter-spacing: -0.02em;
  font-weight: 900;
  color: var(--snow);
}

.page-about .about-hero__lede {
  max-width: 640px;
  margin: 0 0 28px;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.85;
  color: var(--about-body);
}

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

.page-about .about-metrics {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--about-hair-strong);
  border: 1px solid var(--about-hair-strong);
}

.page-about .about-metric {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 18px 16px 20px;
  background: rgba(14, 26, 51, 0.82);
}

.page-about .about-metric__value {
  display: flex;
  align-items: baseline;
  gap: 3px;
  line-height: 1;
}

.page-about .about-metric__num {
  font-size: clamp(24px, 3vw, 34px);
  font-weight: 700;
  color: var(--amber);
  letter-spacing: -0.01em;
}

.page-about .about-metric__unit {
  font-size: 12px;
  color: var(--steel);
}

.page-about .about-metric__label {
  font-size: 12.5px;
  line-height: 1.65;
  color: var(--about-body-dim);
}

/* ---------- 主体布局 ---------- */
.page-about .about-body {
  padding-top: clamp(36px, 5vw, 60px);
  padding-bottom: clamp(48px, 6vw, 90px);
}

.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 44px);
}

/* ---------- 章节索引 ---------- */
.page-about .about-index {
  border-top: 1px solid var(--about-hair-strong);
  padding-top: 16px;
}

.page-about .about-index__label {
  display: block;
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--steel);
  margin-bottom: 14px;
}

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

.page-about .about-index__link {
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  padding: 6px 10px;
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--about-body-dim);
  text-decoration: none;
  border: 1px solid var(--about-hair);
  border-left: 2px solid transparent;
  transition: color 0.2s var(--ease), background 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .about-index__link .mono {
  font-size: 10.5px;
  letter-spacing: 0.08em;
  color: var(--steel);
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  color: var(--snow);
  border-color: var(--line-hard);
  background: rgba(22, 41, 77, 0.6);
}

.page-about .about-index__link[aria-current="true"] {
  color: var(--snow);
  border-color: rgba(255, 77, 154, 0.45);
  border-left-color: var(--neon);
  background: rgba(255, 77, 154, 0.1);
}

.page-about .about-index__link[aria-current="true"] .mono {
  color: var(--neon);
}

/* ---------- 连续阅读区 ---------- */
.page-about .about-section {
  padding: clamp(34px, 4.6vw, 54px) 0;
  border-top: 1px solid var(--about-hair);
  scroll-margin-top: 96px;
}

.page-about .about-flow > .about-section:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .about-section__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 22px;
}

.page-about .about-section__num {
  flex: none;
  font-size: 11.5px;
  letter-spacing: 0.14em;
  line-height: 1;
  padding: 5px 7px;
  color: var(--neon);
  border: 1px solid rgba(255, 77, 154, 0.4);
}

.page-about .about-section__title {
  margin: 0;
  font-size: clamp(20px, 2.7vw, 29px);
  line-height: 1.3;
  letter-spacing: -0.02em;
  font-weight: 900;
  color: var(--snow);
}

.page-about .about-prose p {
  max-width: 720px;
  margin: 0 0 16px;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--about-body);
}

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

.page-about .about-prose a {
  color: var(--violet);
  text-decoration: none;
  border-bottom: 1px solid rgba(184, 167, 255, 0.4);
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .about-prose a:hover,
.page-about .about-prose a:focus-visible {
  color: var(--neon);
  border-bottom-color: var(--neon);
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 22px 0 26px;
}

.page-about .about-figure--mix {
  max-width: 560px;
}

.page-about .about-figure .media-frame__img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(0.92);
}

/* ---------- 时间线 ---------- */
.page-about .timeline {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 6px 0 6px 30px;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 14px;
  bottom: 14px;
  width: 1px;
  background: linear-gradient(180deg, var(--neon) 0%, var(--violet) 48%, rgba(184, 167, 255, 0) 100%);
}

.page-about .timeline__item {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 4px;
  padding: 14px 0 16px;
}

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: -30px;
  top: 20px;
  width: 10px;
  height: 10px;
  background: var(--ink-900);
  border: 1px solid var(--neon);
  transform: rotate(45deg);
}

.page-about .timeline__year {
  font-size: 19px;
  line-height: 1;
  letter-spacing: 0.04em;
  color: var(--amber);
}

.page-about .timeline__title {
  margin: 0 0 6px;
  font-size: 15.5px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--snow);
}

.page-about .timeline__text {
  max-width: 620px;
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--about-body);
}

/* ---------- 审核步骤 ---------- */
.page-about .review-steps {
  list-style: none;
  margin: 4px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .review-step {
  padding: 20px 18px 22px;
  background: rgba(22, 41, 77, 0.5);
  border-left: 2px solid var(--amber);
  border-top: 1px solid rgba(242, 169, 59, 0.18);
}

.page-about .review-step__num {
  display: block;
  font-size: 10.5px;
  letter-spacing: 0.18em;
  color: var(--amber);
  margin-bottom: 10px;
}

.page-about .review-step__title {
  margin: 0 0 8px;
  font-size: 15.5px;
  font-weight: 700;
  color: var(--snow);
}

.page-about .review-step__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--about-body);
}

/* ---------- 团队矩阵 ---------- */
.page-about .team-matrix {
  list-style: none;
  margin: 4px 0 22px;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--about-hair-strong);
  border: 1px solid var(--about-hair-strong);
}

.page-about .team-cell {
  padding: 20px 16px 22px;
  background: rgba(14, 26, 51, 0.88);
  transition: background 0.24s var(--ease);
}

.page-about .team-cell:hover {
  background: rgba(22, 41, 77, 0.96);
}

.page-about .team-cell__num {
  display: block;
  font-size: clamp(22px, 3vw, 30px);
  line-height: 1;
  color: var(--snow);
  margin-bottom: 10px;
}

.page-about .team-cell__title {
  margin: 0 0 8px;
  font-size: 14.5px;
  font-weight: 700;
  color: var(--snow);
}

.page-about .team-cell__text {
  margin: 0;
  font-size: 13px;
  line-height: 1.72;
  color: var(--about-body-dim);
}

/* ---------- 覆盖数据 ---------- */
.page-about .coverage-stats {
  list-style: none;
  margin: 4px 0 8px;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--about-hair-strong);
  border-top: 1px solid var(--about-hair-strong);
  border-bottom: 1px solid var(--about-hair-strong);
}

.page-about .coverage-stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 20px 18px;
  background: rgba(14, 26, 51, 0.7);
}

.page-about .coverage-stat__num {
  font-size: clamp(30px, 4.2vw, 44px);
  line-height: 1;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--violet);
}

.page-about .coverage-stat__unit {
  font-size: 0.45em;
  margin-left: 3px;
  color: var(--steel);
}

.page-about .coverage-stat__label {
  font-size: 13px;
  line-height: 1.7;
  color: var(--about-body-dim);
}

/* ---------- 行业认可便签 ---------- */
.page-about .award-note {
  position: relative;
  margin-top: 20px;
  padding: 26px 22px 28px;
  background: var(--cream);
  color: var(--brown);
  border-left: 3px solid var(--gold);
}

.page-about .award-note__kicker {
  display: block;
  font-size: 10.5px;
  letter-spacing: 0.2em;
  color: var(--gold);
  margin: 0 0 12px;
}

.page-about .award-note__text {
  max-width: 640px;
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--brown);
}

/* ---------- 服务原则 ---------- */
.page-about .principles {
  list-style: none;
  margin: 4px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
  border-top: 1px solid var(--about-hair);
}

.page-about .principle {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 4px 14px;
  padding: 22px 0;
  border-bottom: 1px solid var(--about-hair);
}

.page-about .principle__num {
  grid-row: span 2;
  align-self: start;
  font-size: 13px;
  line-height: 1.6;
  letter-spacing: 0.1em;
  color: var(--neon);
  padding-top: 2px;
}

.page-about .principle__title {
  margin: 0 0 6px;
  font-size: 16px;
  font-weight: 700;
  color: var(--snow);
}

.page-about .principle__text {
  margin: 0;
  max-width: 620px;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--about-body);
}

/* ---------- 收尾入口 ---------- */
.page-about .about-next {
  margin-top: 28px;
  padding: 24px 20px 26px;
  background: rgba(14, 26, 51, 0.72);
  border: 1px solid var(--about-hair-strong);
  border-left: 2px solid var(--neon);
}

.page-about .about-next__text {
  margin: 0 0 18px;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--about-body);
}

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

/* ---------- 断点 ---------- */
@media (min-width: 620px) {
  .page-about .coverage-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .review-steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 10px;
  }
}

@media (min-width: 720px) {
  .page-about .timeline__item {
    grid-template-columns: 96px minmax(0, 1fr);
    gap: 26px;
    align-items: start;
    padding: 18px 0 20px;
  }

  .page-about .timeline__item::before {
    top: 24px;
  }

  .page-about .timeline__year {
    font-size: 24px;
  }

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

  .page-about .principles {
    border-top: 0;
  }
}

@media (min-width: 960px) {
  .page-about .about-layout {
    grid-template-columns: 208px minmax(0, 1fr);
    gap: clamp(40px, 5vw, 84px);
  }

  .page-about .about-index-wrap {
    align-self: start;
  }

  .page-about .about-index {
    position: sticky;
    top: 96px;
  }

  .page-about .about-index__list {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 2px;
  }

  .page-about .about-index__link {
    width: 100%;
    padding: 9px 10px;
    font-size: 13.5px;
    border: 0;
    border-left: 2px solid transparent;
  }

  .page-about .about-index__link[aria-current="true"] {
    border-color: transparent;
    border-left-color: var(--neon);
    background: rgba(255, 77, 154, 0.08);
  }
}

@media (min-width: 980px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.32fr) minmax(0, 0.88fr);
    align-items: start;
  }
}

@media (max-width: 619px) {
  .page-about .about-hero__actions .btn {
    flex: 1 1 100%;
    text-align: center;
  }

  .page-about .about-next__links .btn {
    flex: 1 1 100%;
    text-align: center;
  }

  .page-about .about-figure--mix {
    max-width: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-index__link,
  .page-about .team-cell,
  .page-about .about-prose a {
    transition: none;
  }
}