.page-about {
  --about-rail: 200px;
  --about-line: rgba(110, 118, 134, .3);
}

.page-about .breadcrumbs {
  padding-top: .9rem;
}

/* ===== 首屏 ===== */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--line-soft);
  background:
    radial-gradient(120% 90% at 8% 0%, rgba(140, 47, 30, .38), rgba(11, 14, 20, 0) 62%),
    var(--ink-900);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 56px 56px;
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 2.25rem;
  padding: clamp(2.4rem, 6vw, 4.6rem) 0 clamp(2.4rem, 5vw, 3.8rem);
}

.page-about .about-hero h1 {
  margin: .55rem 0 1rem;
  max-width: 20ch;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.95rem, 4.6vw, 3.3rem);
  line-height: 1.16;
  letter-spacing: -.01em;
  color: var(--paper);
}

.page-about .about-hero .lede {
  max-width: 44ch;
  color: var(--mist);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .7rem;
  margin-top: 1.7rem;
}

.page-about .about-hero__scale {
  display: flex;
  flex-direction: column;
  padding-left: 1.1rem;
  border-left: 1px solid var(--copper);
}

.page-about .about-hero__scale-label {
  margin: 0;
  font-size: .78rem;
  letter-spacing: .16em;
  color: var(--mist);
}

.page-about .about-hero__year {
  margin: .35rem 0 0;
  font-family: var(--font-mono);
  font-size: clamp(2.8rem, 9vw, 4.6rem);
  line-height: 1;
  letter-spacing: .04em;
  color: var(--gold-bright);
}

.page-about .about-hero__axis {
  position: relative;
  height: 1px;
  margin: .9rem 0 .6rem;
  background: linear-gradient(90deg, var(--gold), rgba(140, 47, 30, .2));
}

.page-about .about-hero__axis span {
  position: absolute;
  right: 0;
  top: -3px;
  width: 7px;
  height: 7px;
  background: var(--jade);
}

.page-about .about-hero__scale-note {
  margin: 0;
  font-size: .84rem;
  color: var(--mist);
}

/* ===== 起点与定位 ===== */
.page-about .about-origin {
  padding: clamp(2.6rem, 6vw, 4.4rem) 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-origin__grid {
  display: grid;
  gap: 2.25rem;
}

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

.page-about .capability-list {
  list-style: none;
  margin: 1.9rem 0 0;
  padding: 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .capability-list li {
  display: grid;
  gap: .35rem;
  padding: .95rem 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .capability-list__key {
  font-family: var(--font-mono);
  font-size: .76rem;
  letter-spacing: .14em;
  color: var(--gold);
}

.page-about .capability-list__body {
  color: var(--paper);
  font-size: var(--about-body, .97rem);
  line-height: 1.7;
}

/* ===== 阶段时间轴 ===== */
.page-about .about-phases {
  padding: clamp(2.6rem, 6vw, 4.4rem) 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-phases__figure {
  margin: 1.6rem 0 2.4rem;
}

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

.page-about .about-phases__grid {
  display: grid;
  gap: 1.9rem;
}

.page-about .phase-rail__label {
  margin: 0 0 .8rem;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .3em;
  color: var(--gold);
}

.page-about .phase-list {
  list-style: none;
  display: flex;
  gap: .5rem;
  margin: 0;
  padding: 0 0 .3rem;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .phase-list li {
  flex: 0 0 auto;
}

.page-about .phase-link {
  display: inline-flex;
  align-items: baseline;
  gap: .55rem;
  padding: .5rem .75rem;
  border: 1px solid var(--line-soft);
  text-decoration: none;
  color: var(--mist);
  font-size: .9rem;
  transition: color var(--dur), border-color var(--dur), background-color var(--dur);
}

.page-about .phase-link__num {
  font-family: var(--font-mono);
  font-size: .76rem;
  color: var(--gold);
  letter-spacing: .1em;
}

.page-about .phase-link:hover,
.page-about .phase-link:focus-visible {
  color: var(--gold-bright);
  border-color: var(--jade);
}

.page-about .phase-block {
  margin-bottom: 1.1rem;
  padding: clamp(1.35rem, 3vw, 2.1rem);
  background: var(--ink-800);
  border: 1px solid var(--line-soft);
  scroll-margin-top: 4.5rem;
  transition: border-color var(--dur);
}

.page-about .phase-block:target {
  border-color: var(--gold);
}

.page-about .phase-block__num {
  display: block;
  margin-bottom: .65rem;
  font-family: var(--font-mono);
  font-size: .76rem;
  letter-spacing: .18em;
  color: var(--gold);
}

.page-about .phase-block h3 {
  margin: 0 0 .9rem;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.2rem, 2.4vw, 1.5rem);
  line-height: 1.35;
  color: var(--paper);
}

.page-about .phase-block p {
  margin: 0 0 .85rem;
  max-width: 40ch;
  color: var(--mist);
  line-height: 1.8;
}

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

/* ===== 数据条 ===== */
.page-about .data-strip {
  display: grid;
  margin: 0 0 1.1rem;
  border-top: 1px solid var(--about-line);
  border-bottom: 1px solid var(--about-line);
  background: linear-gradient(90deg, rgba(140, 47, 30, .34), rgba(11, 14, 20, 0) 72%);
}

.page-about .data-strip__cell {
  padding: 1rem 1.15rem;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .data-strip__cell:last-child {
  border-bottom: 0;
}

.page-about .data-strip__value {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.45rem;
  line-height: 1.1;
  letter-spacing: .02em;
  color: var(--gold-bright);
}

.page-about .data-strip__label {
  display: block;
  margin-top: .35rem;
  font-size: .8rem;
  line-height: 1.6;
  color: var(--mist);
}

/* ===== 版本演进表 ===== */
.page-about .about-versions {
  padding: clamp(2.6rem, 6vw, 4.4rem) 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-versions__intro {
  margin-top: 1.3rem;
}

.page-about .version-table-wrap {
  margin-top: 1.6rem;
  overflow-x: auto;
  border: 1px solid var(--line-soft);
}

.page-about .version-table {
  width: 100%;
  min-width: 660px;
  border-collapse: collapse;
  font-size: .9rem;
}

.page-about .version-table thead th {
  padding: .75rem .9rem;
  text-align: left;
  font-family: var(--font-body);
  font-weight: 700;
  font-size: .8rem;
  letter-spacing: .08em;
  color: var(--ink-900);
  background: var(--jade);
  border-right: 1px solid rgba(11, 14, 20, .22);
}

.page-about .version-table thead th:last-child {
  border-right: 0;
}

.page-about .version-table tbody tr:nth-child(odd) {
  background: var(--ink-800);
}

.page-about .version-table tbody tr:nth-child(even) {
  background: var(--ink-700);
}

.page-about .version-table tbody th,
.page-about .version-table tbody td {
  padding: .85rem .9rem;
  text-align: left;
  vertical-align: top;
  line-height: 1.65;
  color: var(--paper);
  border-bottom: 1px solid var(--line-soft);
}

.page-about .version-table tbody th {
  font-family: var(--font-mono);
  font-size: .82rem;
  font-weight: 500;
  letter-spacing: .06em;
  color: var(--gold);
  white-space: nowrap;
}

.page-about .version-table tbody tr:last-child th,
.page-about .version-table tbody tr:last-child td {
  border-bottom: 0;
}

.page-about .about-versions__link {
  margin: 1.5rem 0 0;
}

/* ===== 团队 ===== */
.page-about .about-team {
  padding: clamp(2.6rem, 6vw, 4.4rem) 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-team__grid {
  display: grid;
  gap: 2.1rem;
}

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

.page-about .team-grid {
  display: grid;
  gap: 1px;
  margin-top: 2.3rem;
  border: 1px solid var(--line-soft);
  background: var(--line-soft);
}

.page-about .team-card {
  padding: 1.4rem 1.25rem 1.6rem;
  background: var(--ink-800);
}

.page-about .team-card__num {
  display: block;
  margin-bottom: .7rem;
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .2em;
  color: var(--copper);
}

.page-about .team-card h3 {
  margin: 0 0 .6rem;
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--paper);
}

.page-about .team-card p {
  margin: 0;
  font-size: .92rem;
  line-height: 1.75;
  color: var(--mist);
}

/* ===== 服务覆盖与备案 ===== */
.page-about .about-coverage {
  padding: clamp(2.6rem, 6vw, 4.4rem) 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .coverage-grid {
  display: grid;
  gap: 1px;
  margin-top: 1.8rem;
  border: 1px solid var(--line-soft);
  background: var(--line-soft);
}

.page-about .coverage-stat {
  padding: 1.5rem 1.3rem 1.6rem;
  background: var(--ink-800);
}

.page-about .coverage-stat__value {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(2rem, 6vw, 2.9rem);
  line-height: 1;
  letter-spacing: .02em;
  color: var(--gold-bright);
}

.page-about .coverage-stat__label {
  display: block;
  margin-top: .5rem;
  font-size: .82rem;
  letter-spacing: .06em;
  color: var(--mist);
}

.page-about .coverage-stat p {
  margin: .9rem 0 0;
  font-size: .92rem;
  line-height: 1.75;
  color: var(--paper);
}

.page-about .coverage-verify {
  padding: 1.5rem 1.3rem 1.7rem;
  background: linear-gradient(150deg, rgba(140, 47, 30, .5), rgba(20, 25, 36, 1) 70%);
  border-top: 2px solid var(--copper);
}

.page-about .coverage-verify p {
  margin: .5rem 0 0;
  font-size: .93rem;
  line-height: 1.75;
  color: var(--paper);
}

.page-about .coverage-verify__icp {
  font-size: 1rem;
  letter-spacing: .08em;
  color: var(--gold-bright);
}

.page-about .coverage-verify .btn {
  margin-top: 1.2rem;
}

/* ===== 接下来一年 ===== */
.page-about .about-plan {
  padding: clamp(2.6rem, 6vw, 4.4rem) 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .plan-list {
  list-style: none;
  margin: 1.7rem 0 0;
  padding: 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .plan-list li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 1.1rem;
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .plan-list__num {
  font-family: var(--font-mono);
  font-size: .82rem;
  letter-spacing: .14em;
  color: var(--gold);
  padding-top: .2rem;
}

.page-about .plan-list__body h3 {
  margin: 0 0 .5rem;
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--paper);
}

.page-about .plan-list__body p {
  margin: 0;
  font-size: .93rem;
  line-height: 1.75;
  color: var(--mist);
}

/* ===== 收尾 ===== */
.page-about .about-cta {
  background:
    linear-gradient(120deg, rgba(140, 47, 30, .45), rgba(11, 14, 20, 1) 72%),
    var(--ink-900);
  border-top: 2px solid var(--gold);
}

.page-about .about-cta__inner {
  display: grid;
  gap: 1.6rem;
  padding: clamp(2.2rem, 5vw, 3.4rem) 0;
}

.page-about .about-cta h2 {
  margin: .35rem 0 .8rem;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.4rem, 3vw, 2rem);
  line-height: 1.3;
  color: var(--paper);
}

.page-about .about-cta p {
  margin: 0;
  max-width: 46ch;
  font-size: .95rem;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .7rem;
  align-content: start;
}

/* ===== 响应式 ===== */
@media (min-width: 700px) {
  .page-about .data-strip {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .data-strip__cell {
    border-bottom: 0;
    border-right: 1px solid var(--line-soft);
  }

  .page-about .data-strip__cell:last-child {
    border-right: 0;
  }

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

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

  .page-about .coverage-verify {
    grid-column: 1 / -1;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1fr) 240px;
    align-items: end;
    gap: 3rem;
  }

  .page-about .about-origin__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    gap: clamp(2rem, 4vw, 3.4rem);
    align-items: start;
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    gap: clamp(2rem, 4vw, 3.4rem);
    align-items: center;
  }

  .page-about .capability-list li {
    grid-template-columns: 6.5rem minmax(0, 1fr);
    gap: 1rem;
    align-items: baseline;
  }

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

@media (min-width: 1000px) {
  .page-about .about-phases__grid {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(2rem, 4vw, 3.2rem);
    align-items: start;
  }

  .page-about .phase-rail__inner {
    position: sticky;
    top: 2.5rem;
  }

  .page-about .phase-list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
  }

  .page-about .phase-link {
    width: 100%;
    padding: .6rem 0 .6rem 1rem;
    border: 0;
    border-left: 1px solid var(--line-soft);
    position: relative;
    background: none;
  }

  .page-about .phase-link::before {
    content: "";
    position: absolute;
    left: -3px;
    top: 1.05rem;
    width: 5px;
    height: 5px;
    background: var(--stone);
    transition: background-color var(--dur);
  }

  .page-about .phase-link:hover,
  .page-about .phase-link:focus-visible {
    border-color: var(--jade);
  }

  .page-about .phase-link:hover::before,
  .page-about .phase-link:focus-visible::before {
    background: var(--gold);
  }
}

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