.page-about {
  --about-track: linear-gradient(180deg, var(--brick) 0%, var(--lime) 100%);
  --about-hair-light: 1px solid rgba(255, 255, 255, 0.14);
  display: block;
  background: var(--chalk);
  color: var(--carbon);
  padding-bottom: 76px;
  overflow-x: clip;
}

.page-about h2,
.page-about h3 {
  font-weight: 800;
  letter-spacing: -0.01em;
}

.page-about p {
  margin: 0 0 14px;
  line-height: 1.78;
}

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

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: 26px 0 10px;
}

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

.page-about .about-hero__grid {
  display: grid;
  gap: 26px;
  margin: 20px 0 4px;
}

.page-about .about-hero__lead h1 {
  margin: 12px 0 14px;
  font-size: clamp(30px, 7vw, 54px);
  line-height: 1.14;
  font-weight: 900;
  letter-spacing: -0.02em;
  max-width: 20ch;
}

.page-about .about-hero__intro {
  max-width: 46ch;
  font-size: 17px;
  color: #2b333b;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 20px;
}

.page-about .about-hero__panel {
  position: relative;
  overflow: hidden;
  background: var(--ink);
  color: var(--timer-white);
  border-radius: var(--radius-lg);
  padding: 24px 22px 16px;
  box-shadow: var(--shadow-lift);
}

.page-about .about-hero__panel::after {
  content: "";
  position: absolute;
  right: -120px;
  bottom: -150px;
  width: 340px;
  height: 340px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(198, 243, 43, 0.24), transparent 68%);
  pointer-events: none;
}

.page-about .about-hero__panel-title {
  margin: 0 0 6px;
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--lime);
}

.page-about .about-hero__stats {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
  z-index: 1;
}

.page-about .hero-stat {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  padding: 11px 0;
  border-bottom: var(--about-hair-light);
}

.page-about .hero-stat:last-child {
  border-bottom: 0;
}

.page-about .hero-stat__val {
  font-size: 30px;
  font-weight: 900;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.04em;
  color: var(--timer-white);
  line-height: 1;
}

.page-about .hero-stat__label {
  font-size: 13px;
  letter-spacing: 0.06em;
  color: rgba(255, 255, 255, 0.7);
}

/* ---------- 章节索引 ---------- */
.page-about .about-index {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 30px;
  padding: 12px 4px 14px;
  border-top: 1px solid rgba(14, 26, 43, 0.12);
}

.page-about .section-index__label {
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--silver-dim);
}

.page-about .about-index__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .section-index__link {
  display: inline-block;
  padding: 7px 14px;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(14, 26, 43, 0.14);
  background: var(--timer-white);
  color: var(--carbon);
  font-size: 13px;
  letter-spacing: 0.04em;
  text-decoration: none;
  transition: border-color 0.2s ease, background 0.2s ease, color 0.2s ease;
}

.page-about .section-index__link:hover,
.page-about .section-index__link:focus-visible,
.page-about .section-index__link.is-active {
  background: var(--brick);
  border-color: var(--brick);
  color: var(--timer-white);
}

/* ---------- 起点 ---------- */
.page-about .about-start {
  padding: 46px 0 10px;
}

.page-about .plate-index {
  margin: 0 0 10px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.2em;
  color: var(--brick);
}

.page-about .about-start__grid {
  display: grid;
  gap: 26px;
  align-items: start;
}

.page-about .about-start__text p {
  font-size: 16px;
  max-width: 52ch;
}

.page-about .about-start__figure {
  margin: 0;
}

.page-about .figure__media {
  overflow: hidden;
  border-radius: var(--radius-md);
  background: linear-gradient(140deg, #e6dfd6, #cfd4d9);
}

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

.page-about .figure__caption {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--silver-dim);
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  padding: 54px 0 20px;
}

.page-about .about-timeline__head {
  margin-bottom: 30px;
}

.page-about .about-timeline__sub {
  max-width: 54ch;
  font-size: 16px;
  color: #3a4249;
}

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

.page-about .timeline {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 6px 0 0;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 21px;
  top: 10px;
  bottom: 10px;
  width: 4px;
  border-radius: var(--radius-pill);
  background: var(--about-track);
}

.page-about .timeline__item {
  position: relative;
  padding: 0 0 22px 58px;
}

.page-about .timeline__item:last-child {
  padding-bottom: 0;
}

.page-about .timeline__dot {
  position: absolute;
  left: 23px;
  top: 22px;
  width: 14px;
  height: 14px;
  transform: translateX(-50%);
  border-radius: 50%;
  background: var(--brick);
  border: 3px solid var(--chalk);
  box-shadow: 0 0 0 2px rgba(178, 58, 46, 0.35);
}

.page-about .timeline__item:last-child .timeline__dot {
  background: var(--lime);
  box-shadow: 0 0 0 2px rgba(198, 243, 43, 0.5);
}

.page-about .timeline__card {
  background: var(--timer-white);
  border: var(--hair);
  border-radius: var(--radius-md);
  padding: 18px 20px 16px;
  box-shadow: var(--shadow-soft);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.page-about .timeline__card:hover {
  transform: translateY(-2px) rotate(-0.6deg);
  box-shadow: var(--shadow-lift);
}

.page-about .timeline__year {
  margin: 0 0 6px;
  font-size: 13px;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.14em;
  color: var(--brick);
  font-weight: 700;
}

.page-about .timeline__title {
  margin: 0 0 8px;
  font-size: 18px;
  line-height: 1.4;
}

.page-about .timeline__card p {
  font-size: 15px;
  color: #3a4249;
}

.page-about .about-timeline__figure {
  margin: 0;
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  padding: 54px 0 20px;
}

.page-about .about-team__head {
  margin-bottom: 26px;
}

.page-about .about-team__sub {
  max-width: 56ch;
  font-size: 16px;
  color: #3a4249;
}

.page-about .lanes {
  display: grid;
  gap: 14px;
}

.page-about .lane {
  border-radius: var(--radius-md);
  padding: 20px 22px 18px;
  color: var(--timer-white);
  position: relative;
  overflow: hidden;
}

.page-about .lane--data {
  background: linear-gradient(150deg, var(--brick), var(--brick-deep));
}

.page-about .lane--calendar {
  background: linear-gradient(150deg, var(--brick-deep), #5c1a14);
}

.page-about .lane--content {
  background: linear-gradient(150deg, var(--ink), var(--ink-soft));
}

.page-about .lane__num {
  margin: 0;
  font-size: 46px;
  font-weight: 900;
  line-height: 1;
  letter-spacing: 0.02em;
  font-variant-numeric: tabular-nums;
  color: var(--lime);
}

.page-about .lane__name {
  margin: 8px 0 8px;
  font-size: 17px;
}

.page-about .lane__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.82);
}

/* ---------- 流程 ---------- */
.page-about .about-workflow {
  padding: 48px 0 20px;
}

.page-about .about-workflow__head {
  margin-bottom: 24px;
}

.page-about .about-workflow__sub {
  max-width: 54ch;
  font-size: 16px;
  color: #3a4249;
}

.page-about .steps {
  list-style: none;
  display: grid;
  gap: 16px;
  margin: 0;
  padding: 0;
}

.page-about .step {
  position: relative;
  background: var(--timer-white);
  border: var(--hair);
  border-radius: var(--radius-md);
  padding: 20px 20px 16px;
  border-top: 3px solid var(--silver);
}

.page-about .step__idx {
  display: inline-block;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.18em;
  font-variant-numeric: tabular-nums;
  color: var(--brick);
  border: 1px solid rgba(178, 58, 46, 0.3);
  border-radius: var(--radius-pill);
  padding: 3px 10px;
}

.page-about .step__title {
  margin: 12px 0 8px;
  font-size: 17px;
}

.page-about .step p {
  font-size: 14.5px;
  color: #3a4249;
}

.page-about .about-workflow__note {
  margin-top: 22px;
  padding: 18px 20px;
  border-left: 4px solid var(--lime);
  background: rgba(198, 243, 43, 0.14);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-size: 15px;
  color: #2b333b;
}

/* ---------- 协作网络 ---------- */
.page-about .about-network {
  padding: 48px 0 20px;
}

.page-about .about-network__grid {
  display: grid;
  gap: 26px;
  align-items: start;
}

.page-about .about-network__text p {
  font-size: 16px;
  max-width: 52ch;
}

.page-about .about-network__tags-label {
  margin: 0 0 12px;
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--silver-dim);
}

.page-about .net-tags {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
  margin: 0;
  padding: 0;
}

.page-about .net-tag {
  display: inline-block;
  padding: 9px 15px;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(14, 26, 43, 0.16);
  background: var(--timer-white);
  font-size: 13.5px;
  letter-spacing: 0.03em;
  color: var(--carbon);
  transition: border-color 0.2s ease, color 0.2s ease, transform 0.2s ease;
}

.page-about .net-tag:hover {
  border-color: var(--lime);
  color: var(--brick);
  transform: translateY(-1px) rotate(-0.8deg);
}

/* ---------- 服务地区 ---------- */
.page-about .about-region {
  padding: 44px 0 0;
}

.page-about .about-region__figure {
  margin: 0 0 26px;
}

.page-about .about-region__panel {
  display: grid;
  gap: 24px;
  background: var(--ink);
  color: var(--timer-white);
  border-radius: var(--radius-lg);
  padding: 28px 24px 26px;
  box-shadow: var(--shadow-lift);
}

.page-about .about-region__panel h2 {
  margin: 0 0 12px;
  font-size: clamp(22px, 4.4vw, 32px);
  line-height: 1.24;
  color: var(--timer-white);
}

.page-about .about-region__panel .plate-index {
  color: var(--lime);
}

.page-about .about-region__text p {
  font-size: 15.5px;
  color: rgba(255, 255, 255, 0.82);
  max-width: 58ch;
}

.page-about .about-region__mail {
  color: var(--lime);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-region__cta {
  border-top: var(--about-hair-light);
  padding-top: 20px;
}

.page-about .about-region__cta-title {
  margin: 0 0 8px;
  font-size: 16px;
  font-weight: 700;
  color: var(--timer-white);
}

.page-about .about-region__cta-text {
  font-size: 14.5px;
  color: rgba(255, 255, 255, 0.72);
}

.page-about .about-region__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 18px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 760px) {
  .page-about .about-hero {
    padding-top: 34px;
  }

  .page-about .about-start__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: 36px;
    align-items: center;
  }

  .page-about .lanes {
    grid-template-columns: 6fr 3fr 2fr;
    align-items: stretch;
  }

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

  .page-about .about-network__grid {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr);
    gap: 38px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 0.9fr);
    gap: 42px;
    align-items: end;
  }

  .page-about .about-timeline__body {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
    gap: 40px;
    align-items: start;
  }

  .page-about .about-timeline__figure {
    position: sticky;
    top: 110px;
  }

  .page-about .timeline__item {
    padding-left: 74px;
  }

  .page-about .about-region__panel {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
    gap: 38px;
    align-items: start;
    padding: 34px 34px 30px;
  }

  .page-about .about-region__cta {
    border-top: 0;
    border-left: var(--about-hair-light);
    padding-top: 0;
    padding-left: 28px;
  }
}

@media (min-width: 1180px) {
  .page-about .about-hero__panel {
    padding: 28px 26px 20px;
  }

  .page-about .hero-stat__val {
    font-size: 34px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .timeline__card,
  .page-about .net-tag,
  .page-about .section-index__link {
    transition: none;
  }

  .page-about .timeline__card:hover,
  .page-about .net-tag:hover {
    transform: none;
  }
}