.page-about {
  --about-rail: 72px;
  --about-gap: clamp(16px, 2.4vw, 34px);
  --about-chapter-gap: clamp(52px, 7vw, 104px);
  display: block;
  background: var(--paper-100);
  color: var(--ink-900);
  overflow-x: clip;
}

/* ── 面包屑 ───────────────────────────── */
.page-about .about-crumbs {
  padding-top: clamp(20px, 3vw, 34px);
}

/* ── 首屏框景 ─────────────────────────── */
.page-about .about-hero {
  padding: clamp(18px, 3vw, 32px) 0 clamp(44px, 6vw, 80px);
}

.page-about .about-hero__frame {
  position: relative;
  padding: clamp(26px, 4vw, 56px);
  background:
    radial-gradient(130% 110% at 100% 0%, rgba(235, 230, 220, 0.9), rgba(247, 245, 240, 0) 62%),
    var(--paper-100);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 52px);
  align-items: end;
}

.page-about .about-hero__lead .h-display {
  margin: clamp(10px, 1.6vw, 18px) 0 clamp(16px, 2vw, 24px);
}

.page-about .about-hero__lead .lede {
  max-width: 48ch;
  margin: 0;
}

.page-about .about-glance {
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--hair);
}

.page-about .about-glance__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 11px 0;
  border-bottom: 1px solid var(--hair);
}

.page-about .about-glance dt {
  flex: 0 0 auto;
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--stone-500);
}

.page-about .about-glance dd {
  margin: 0;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.02em;
  font-variant-numeric: tabular-nums;
  text-align: right;
  word-break: break-word;
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    gap: clamp(32px, 4vw, 64px);
  }
}

/* ── 纵向坐标轴：章节骨架 ─────────────── */
.page-about .about-flow {
  padding-bottom: clamp(28px, 5vw, 56px);
}

.page-about .about-chapter {
  display: grid;
  grid-template-columns: 1fr;
  padding-bottom: var(--about-chapter-gap);
}

.page-about .about-chapter__rail {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 16px;
  position: relative;
}

.page-about .about-chapter__rail::before {
  content: "";
  flex: 1 1 auto;
  height: 1px;
  background: var(--hair);
}

.page-about .about-chapter__idx {
  font-size: 13px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.18em;
  color: var(--signal-700);
  font-variant-numeric: tabular-nums;
}

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

.page-about .about-chapter__body > .h-section {
  margin-top: 0;
  margin-bottom: clamp(14px, 2vw, 22px);
}

@media (min-width: 880px) {
  .page-about .about-chapter {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    column-gap: var(--about-gap);
  }

  .page-about .about-chapter__rail {
    display: block;
    margin-bottom: 0;
    padding-top: 2px;
  }

  .page-about .about-chapter__rail::before {
    display: none;
  }

  .page-about .about-chapter__rail::after {
    content: "";
    position: absolute;
    left: 0;
    top: 26px;
    bottom: calc(-1 * var(--about-chapter-gap));
    width: 1px;
    background: var(--hair);
  }
}

/* ── 正文字段 ─────────────────────────── */
.page-about .about-text {
  max-width: 68ch;
  margin: 0 0 1.2em;
  font-size: 17px;
  line-height: 1.85;
}

.page-about .about-text--note {
  max-width: 72ch;
  margin-top: clamp(20px, 3vw, 30px);
  padding-top: clamp(16px, 2vw, 22px);
  border-top: 1px solid var(--hair);
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-500);
}

.page-about .about-inline-link {
  color: var(--signal-700);
  text-decoration: none;
  border-bottom: 1px solid rgba(232, 85, 31, 0.42);
  padding-bottom: 1px;
  transition: border-color 0.22s var(--ease-out), color 0.22s var(--ease-out);
}

.page-about .about-inline-link:hover,
.page-about .about-inline-link:focus-visible {
  border-bottom-color: var(--signal-700);
}

/* ── 01 业务要点清单 ──────────────────── */
.page-about .about-facts {
  margin-top: clamp(24px, 3vw, 40px);
  border-top: 1px solid var(--hair);
}

.page-about .about-fact {
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px;
  padding: 17px 0;
  border-bottom: 1px solid var(--hair);
}

.page-about .about-fact__k {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--ink-500);
}

.page-about .about-fact__v {
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.8;
}

@media (min-width: 760px) {
  .page-about .about-fact {
    grid-template-columns: 190px minmax(0, 1fr);
    gap: 28px;
    align-items: baseline;
  }
}

/* ── 图注 ─────────────────────────────── */
.page-about .about-figure {
  margin: clamp(26px, 4vw, 42px) 0 0;
}

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

/* ── 02 版本演进 ──────────────────────── */
.page-about .about-releases {
  list-style: none;
  margin: clamp(28px, 4vw, 46px) 0 0;
  padding: 0;
  border-top: 1px solid var(--hair);
}

.page-about .about-release {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
  padding: clamp(20px, 2.6vw, 28px) 0;
  border-bottom: 1px solid var(--hair);
}

.page-about .about-release__key {
  display: flex;
  align-items: baseline;
  gap: 12px;
  flex-wrap: wrap;
}

.page-about .about-release__ver {
  font-size: clamp(1.5rem, 3.2vw, 2.1rem);
  font-weight: 800;
  line-height: 1;
  letter-spacing: 0.04em;
  color: var(--signal-700);
  font-variant-numeric: tabular-nums;
}

.page-about .about-release__when {
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--stone-500);
}

.page-about .about-release__title {
  margin: 0 0 8px;
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  line-height: 1.5;
}

.page-about .about-release__text p {
  margin: 0;
  max-width: 66ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-500);
}

@media (min-width: 880px) {
  .page-about .about-release {
    grid-template-columns: 180px minmax(0, 1fr);
    gap: 36px;
    align-items: start;
  }
}

/* ── 03 团队 ──────────────────────────── */
.page-about .about-teams {
  list-style: none;
  margin: clamp(24px, 3vw, 38px) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--hair);
  border: 1px solid var(--hair);
}

.page-about .about-team {
  background: var(--paper-200);
  padding: clamp(20px, 2.6vw, 30px);
}

.page-about .about-team__num {
  margin: 0;
  font-size: clamp(2.1rem, 5vw, 2.9rem);
  font-weight: 800;
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--ink-900);
  font-variant-numeric: tabular-nums;
}

.page-about .about-team__unit {
  font-size: 0.38em;
  font-weight: 700;
  margin-left: 0.25em;
  letter-spacing: 0.1em;
  color: var(--stone-500);
}

.page-about .about-team__name {
  margin: 14px 0 8px;
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  line-height: 1.5;
}

.page-about .about-team__desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-500);
}

@media (min-width: 800px) {
  .page-about .about-teams {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ── 通栏数据带 ───────────────────────── */
.page-about .about-band {
  position: relative;
  padding: clamp(40px, 6vw, 78px) 0;
  background: var(--ink-900);
  color: var(--paper-100);
}

.page-about .about-band::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(96deg, rgba(232, 85, 31, 0.13), rgba(63, 169, 140, 0.07) 54%, rgba(11, 22, 34, 0) 82%),
    repeating-linear-gradient(90deg, rgba(247, 245, 240, 0.055) 0 1px, transparent 1px 92px);
}

.page-about .about-band__grid {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 48px);
  align-items: center;
}

.page-about .about-band__label {
  margin: 0 0 clamp(18px, 2.4vw, 28px);
  color: var(--signal-500);
}

.page-about .about-band__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(18px, 2.6vw, 30px) clamp(16px, 3vw, 38px);
}

.page-about .about-band__item {
  padding-top: 13px;
  border-top: 1px solid var(--hair-dark);
}

.page-about .about-band__num {
  display: block;
  font-size: clamp(1.7rem, 4.4vw, 2.7rem);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: 0.01em;
  color: var(--paper-100);
  font-variant-numeric: tabular-nums;
}

.page-about .about-band__unit {
  font-size: 0.42em;
  font-weight: 700;
  margin-left: 0.18em;
  letter-spacing: 0.06em;
  color: var(--signal-500);
}

.page-about .about-band__cap {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  line-height: 1.6;
  letter-spacing: 0.08em;
  color: var(--on-dark-soft);
}

.page-about .about-band__figure {
  margin: 0;
  padding: clamp(12px, 1.8vw, 20px);
  background: var(--ink-700);
  border: 1px solid var(--hair-dark);
}

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

@media (min-width: 700px) {
  .page-about .about-band__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 940px) {
  .page-about .about-band__grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    gap: clamp(32px, 4vw, 64px);
  }
}

/* ── 04 自助到人工 ────────────────────── */
.page-about .about-steps {
  list-style: none;
  margin: clamp(24px, 3vw, 38px) 0 0;
  padding: 0;
}

.page-about .about-step {
  display: grid;
  grid-template-columns: 30px minmax(0, 1fr);
  gap: 16px;
  padding: clamp(18px, 2.4vw, 26px) 0;
  border-bottom: 1px solid var(--hair);
}

.page-about .about-step:first-child {
  border-top: 1px solid var(--hair);
}

.page-about .about-step__n {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  margin-top: 2px;
  border: 1px solid var(--signal-500);
  border-radius: 50%;
  font-size: 12px;
  font-weight: 700;
  line-height: 1;
  color: var(--signal-700);
  font-variant-numeric: tabular-nums;
}

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

.page-about .about-step__body h3 {
  margin: 0 0 6px;
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  line-height: 1.5;
}

.page-about .about-step__body p {
  margin: 0;
  max-width: 68ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-500);
}

/* ── 05 运营主体 ──────────────────────── */
.page-about .about-operator {
  margin-top: clamp(22px, 3vw, 34px);
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--hair);
  border: 1px solid var(--hair);
}

.page-about .about-operator__col {
  background: var(--paper-100);
  padding: clamp(16px, 2vw, 22px);
}

.page-about .about-operator__k {
  margin: 0 0 6px;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--stone-500);
}

.page-about .about-operator__v {
  margin: 0;
  font-size: 15px;
  font-weight: 600;
  line-height: 1.7;
  letter-spacing: 0.02em;
  word-break: break-word;
}

@media (min-width: 720px) {
  .page-about .about-operator {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1040px) {
  .page-about .about-operator {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ── 窄屏兜底 ─────────────────────────── */
@media (max-width: 420px) {
  .page-about .about-band__list {
    grid-template-columns: 1fr;
  }

  .page-about .about-band__num {
    font-size: 1.75rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-inline-link {
    transition: none;
  }
}
</main>