.page-about {
  background: var(--paper);
  color: var(--ink);
  overflow-x: hidden;
}

.page-about .breadcrumb {
  padding-top: 24px;
}

/* ---------- 首屏 ---------- */

.page-about .about-intro {
  border-bottom: 1px solid var(--paper-line);
  padding: 28px 0 48px;
}

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

.page-about .about-intro__year {
  display: flex;
  align-items: center;
  gap: 14px;
}

.page-about .about-intro__year-num {
  font-size: 26px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--brand);
}

.page-about .about-intro__year-line {
  flex: 1;
  min-width: 28px;
  height: 1px;
  background: linear-gradient(to right, var(--paper-line), var(--steel-soft));
}

.page-about .about-intro__eyebrow {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--steel);
}

.page-about .about-intro h1 {
  margin: 0 0 20px;
  font-size: clamp(30px, 6.4vw, 58px);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.03em;
  max-width: 16em;
}

.page-about .about-intro .lede {
  margin: 0;
  max-width: 46em;
  color: var(--ink-2);
}

@media (min-width: 900px) {
  .page-about .about-intro {
    padding: 36px 0 64px;
  }
  .page-about .about-intro__inner {
    grid-template-columns: 190px minmax(0, 1fr);
    gap: 56px;
    align-items: start;
  }
  .page-about .about-intro__year {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
    padding-top: 8px;
  }
  .page-about .about-intro__year-num {
    font-size: 36px;
  }
  .page-about .about-intro__year-line {
    flex: 1;
    width: 1px;
    min-width: 0;
    height: auto;
    min-height: 72px;
    background: linear-gradient(to bottom, var(--paper-line), var(--steel-soft));
  }
}

/* ---------- 章节骨架 ---------- */

.page-about .section {
  padding-top: 52px;
  padding-bottom: 56px;
  border-bottom: 1px solid var(--paper-line);
}

.page-about .section--ink {
  background: var(--ink);
  color: var(--paper);
  border-bottom-color: transparent;
}

.page-about .section-head {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 12px 16px;
  margin-bottom: 26px;
}

.page-about .section-head__num {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--brand);
  padding: 3px 7px;
  border: 1px solid currentColor;
  line-height: 1.4;
}

.page-about .section-head__title {
  margin: 0;
  font-size: clamp(23px, 3.4vw, 40px);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.page-about .section--ink .section-head__num {
  color: var(--amber-soft);
}

.page-about .section--ink .section-head__title {
  color: var(--paper);
}

.page-about .section__lede {
  margin: 0 0 34px;
  max-width: 44em;
  font-size: clamp(16px, 1.4vw, 19px);
  line-height: 1.75;
  color: rgba(243, 238, 228, 0.78);
}

/* ---------- 通用分栏 ---------- */

.page-about .split {
  display: grid;
  gap: 30px;
}

.page-about .split__text p {
  margin: 0 0 18px;
  max-width: 40em;
  color: var(--ink-2);
}

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

@media (min-width: 900px) {
  .page-about .split {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 52px;
    align-items: start;
  }
  .page-about .split--wide {
    grid-template-columns: minmax(0, 6fr) minmax(0, 6fr);
  }
  .page-about .split--flip {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  }
}

/* ---------- 图片 ---------- */

.page-about .about-figure {
  margin: 0;
  border: 1px solid var(--paper-line);
  background: var(--paper-card);
}

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

.page-about .about-figure figcaption {
  padding: 10px 14px;
  border-top: 1px solid var(--paper-line);
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: 0.02em;
  color: var(--steel);
}

.page-about .about-figure--end {
  margin-top: 36px;
}

@media (min-width: 900px) {
  .page-about .about-figure--end {
    margin-top: 48px;
  }
}

/* ---------- 档位 ---------- */

.page-about .tier-grid {
  display: grid;
  gap: 1px;
  background: rgba(243, 238, 228, 0.18);
  border: 1px solid rgba(243, 238, 228, 0.18);
}

@media (min-width: 680px) {
  .page-about .tier-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

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

.page-about .tier {
  background: var(--ink);
  padding: 26px 20px 28px;
  border-top: 3px solid var(--tier-accent, var(--blue-soft));
  display: flex;
  flex-direction: column;
  gap: 8px;
  transition: background-color 200ms var(--ease);
}

.page-about .tier:hover {
  background: #101F32;
}

.page-about .tier--entry { --tier-accent: var(--blue-soft); }
.page-about .tier--main  { --tier-accent: var(--signal); }
.page-about .tier--pro   { --tier-accent: var(--amber); }
.page-about .tier--flag  { --tier-accent: var(--amber-soft); }

.page-about .tier__count {
  font-size: 42px;
  font-weight: 700;
  line-height: 1;
  color: var(--tier-accent, var(--blue-soft));
  font-variant-numeric: tabular-nums;
}

.page-about .tier__name {
  margin: 0;
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--paper);
}

.page-about .tier__range {
  margin: 0;
  font-size: 15px;
  font-weight: 500;
  color: var(--amber-soft);
  letter-spacing: 0.01em;
}

.page-about .tier__desc {
  margin: 4px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: rgba(243, 238, 228, 0.74);
}

.page-about .tier__codes {
  margin: auto 0 0;
  padding-top: 14px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: rgba(243, 238, 228, 0.45);
}

/* ---------- 区域分布 ---------- */

.page-about .region-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .region {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr) 28px;
  align-items: center;
  gap: 12px;
}

.page-about .region__name {
  font-size: 13px;
  color: var(--steel);
  letter-spacing: 0.04em;
}

.page-about .region__track {
  display: block;
  height: 12px;
  background: var(--paper-line);
  overflow: hidden;
}

.page-about .region__fill {
  display: block;
  width: var(--w, 0%);
  height: 100%;
  background: var(--brand);
  transition: background-color 200ms var(--ease);
}

.page-about .region__fill--amber {
  background: var(--amber);
}

.page-about .region:hover .region__fill {
  background: var(--signal);
}

.page-about .region:hover .region__fill--amber {
  background: var(--amber-soft);
}

.page-about .region__num {
  font-size: 15px;
  font-weight: 700;
  text-align: right;
  color: var(--ink);
  font-variant-numeric: tabular-nums;
}

/* ---------- 团队数字 ---------- */

.page-about .team-figures {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: 34px;
  background: var(--paper-line);
  border: 1px solid var(--paper-line);
}

@media (min-width: 860px) {
  .page-about .team-figures {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    margin-top: 44px;
  }
}

.page-about .team-figure {
  background: var(--paper-card);
  padding: 20px 18px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  transition: background-color 200ms var(--ease);
}

.page-about .team-figure:hover {
  background: #FFFFFF;
}

.page-about .team-figure__v {
  font-size: clamp(28px, 4.4vw, 40px);
  font-weight: 700;
  line-height: 1;
  color: var(--brand);
  font-variant-numeric: tabular-nums;
}

.page-about .team-figure__k {
  font-size: 13px;
  line-height: 1.5;
  color: var(--steel);
}

/* ---------- 认证 ---------- */

.page-about .cert-list {
  list-style: none;
  margin: 38px 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--paper-line);
  border-top: 1px solid var(--paper-line);
  border-bottom: 1px solid var(--paper-line);
}

@media (min-width: 860px) {
  .page-about .cert-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0;
    background: transparent;
    border: 0;
  }
}

.page-about .cert {
  background: var(--paper);
  padding: 22px 0;
  border-left: 3px solid var(--brand);
  padding-left: 18px;
}

@media (min-width: 860px) {
  .page-about .cert {
    padding: 4px 24px 4px 20px;
    border-left: 3px solid var(--brand);
  }
  .page-about .cert--mid { border-left-color: var(--signal); }
  .page-about .cert--high { border-left-color: var(--amber); }
}

.page-about .cert__lv {
  display: inline-block;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--brand);
  margin-bottom: 10px;
}

.page-about .cert__body {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--ink-2);
  max-width: 30em;
}

/* ---------- 培训数据条 ---------- */

.page-about .train-strip {
  margin-top: 34px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--paper-line);
  border: 1px solid var(--paper-line);
}

@media (min-width: 860px) {
  .page-about .train-strip {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    margin-top: 42px;
  }
}

.page-about .train-item {
  background: var(--paper-card);
  padding: 18px 16px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .train-item__v {
  font-size: clamp(24px, 3.4vw, 34px);
  font-weight: 700;
  line-height: 1;
  color: var(--amber);
  font-variant-numeric: tabular-nums;
}

.page-about .train-item__k {
  font-size: 13px;
  line-height: 1.5;
  color: var(--steel);
}

/* ---------- 合规清单 ---------- */

.page-about .compliance-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--paper-line);
}

.page-about .compliance {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 16px;
  padding: 16px 0;
  border-bottom: 1px solid var(--paper-line);
}

.page-about .compliance__k {
  min-width: 92px;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--brand);
  font-variant-numeric: tabular-nums;
}

.page-about .compliance__v {
  font-size: 14px;
  line-height: 1.6;
  color: var(--ink-2);
}

/* ---------- 时间轴 ---------- */

.page-about .timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--paper-line);
}

.page-about .timeline__item {
  border-bottom: 1px solid var(--paper-line);
}

.page-about .timeline details > summary {
  display: grid;
  grid-template-columns: 72px minmax(0, 1fr);
  align-items: baseline;
  gap: 16px;
  padding: 20px 0;
  cursor: pointer;
  list-style: none;
  transition: color 180ms var(--ease);
}

.page-about .timeline details > summary::-webkit-details-marker {
  display: none;
}

.page-about .timeline details > summary::marker {
  content: "";
}

.page-about .timeline__year {
  font-size: 20px;
  font-weight: 700;
  line-height: 1.2;
  color: var(--brand);
  letter-spacing: 0.01em;
  font-variant-numeric: tabular-nums;
}

.page-about .timeline__title {
  font-size: clamp(17px, 2vw, 22px);
  font-weight: 700;
  line-height: 1.35;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .timeline details > summary:hover .timeline__title {
  color: var(--signal);
}

.page-about .timeline__body {
  margin: 0 0 22px;
  padding-left: 0;
  max-width: 40em;
  font-size: 15px;
  line-height: 1.78;
  color: var(--ink-2);
}

@media (min-width: 760px) {
  .page-about .timeline details > summary {
    grid-template-columns: 132px minmax(0, 1fr);
    gap: 32px;
    padding: 24px 0;
  }
  .page-about .timeline__year {
    font-size: 28px;
    border-left: 3px solid var(--signal);
    padding-left: 16px;
  }
  .page-about .timeline__body {
    padding-left: 164px;
  }
}

/* ---------- 收束 ---------- */

.page-about .about-next {
  padding: 52px 0 64px;
  background: var(--ink);
  color: var(--paper);
}

.page-about .about-next__title {
  margin: 0 0 28px;
  font-size: clamp(22px, 3vw, 32px);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .next-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: rgba(243, 238, 228, 0.2);
  border: 1px solid rgba(243, 238, 228, 0.2);
}

@media (min-width: 680px) {
  .page-about .next-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

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

.page-about .next-card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  height: 100%;
  padding: 22px 20px 24px;
  background: var(--ink);
  color: var(--paper);
  text-decoration: none;
  border-top: 3px solid transparent;
  transition: background-color 200ms var(--ease), border-top-color 200ms var(--ease);
}

.page-about .next-card:hover,
.page-about .next-card:focus-visible {
  background: #101F32;
  border-top-color: var(--amber);
}

.page-about .next-card__k {
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--amber-soft);
}

.page-about .next-card__t {
  font-size: 17px;
  font-weight: 700;
  line-height: 1.35;
  color: var(--paper);
}

.page-about .next-card__d {
  font-size: 13px;
  line-height: 1.65;
  color: rgba(243, 238, 228, 0.68);
}

@media (prefers-reduced-motion: reduce) {
  .page-about .tier,
  .page-about .team-figure,
  .page-about .next-card,
  .page-about .region__fill,
  .page-about .timeline details > summary {
    transition: none;
  }
}

.page-about {
  --w: 1rem;
}