.page-about {
  --about-rule: rgba(53, 242, 214, 0.12);
  --about-soft: rgba(234, 242, 248, 0.72);
  --about-glow: radial-gradient(120% 90% at 100% 0%, rgba(14, 42, 71, 0.85), transparent 68%);
}

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

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(28px, 6vw, 64px) 0 clamp(36px, 6vw, 72px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -30%;
  right: -12%;
  width: min(620px, 90vw);
  aspect-ratio: 1 / 1;
  background: radial-gradient(circle at 50% 50%, rgba(53, 242, 214, 0.16), transparent 66%);
  pointer-events: none;
}

.page-about .about-hero .shell {
  position: relative;
}

.page-about .about-hero__title {
  max-width: 20ch;
  margin: 18px 0 22px;
  letter-spacing: -0.02em;
}

.page-about .about-hero__lead {
  max-width: 60ch;
  color: var(--about-soft);
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px 28px;
  margin: 40px 0 0;
  padding: 26px 0 0;
  list-style: none;
  border-top: 1px solid var(--about-rule);
}

.page-about .about-fact__num {
  display: block;
  font-size: clamp(28px, 7vw, 40px);
  line-height: 1.1;
  color: var(--cyan);
}

.page-about .about-fact__label {
  display: block;
  margin-top: 6px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--about-soft);
}

@media (min-width: 640px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 版心与索引 ---------- */
.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
  padding-bottom: clamp(48px, 8vw, 96px);
}

.page-about .about-index__title {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--sand);
}

.page-about .about-index__list {
  display: flex;
  gap: 14px;
  margin: 0;
  padding: 0 0 8px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-index__link {
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  white-space: nowrap;
  padding-bottom: 3px;
  font-size: 13px;
  color: rgba(234, 242, 248, 0.66);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 160ms ease, border-color 160ms ease;
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

.page-about .about-index__num {
  font-size: 11px;
  color: var(--cyan);
}

@media (min-width: 1024px) {
  .page-about .about-layout {
    grid-template-columns: 200px minmax(0, 1fr);
    gap: 64px;
    align-items: start;
  }

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

  .page-about .about-index__list {
    flex-direction: column;
    gap: 13px;
    overflow: visible;
    padding-bottom: 0;
  }
}

/* ---------- 章节 ---------- */
.page-about .about-section {
  padding-top: clamp(38px, 6vw, 76px);
  margin-top: clamp(38px, 6vw, 76px);
  border-top: 1px solid var(--about-rule);
  scroll-margin-top: 96px;
}

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

.page-about .about-section--glow {
  background: var(--about-glow);
  border-radius: var(--r-lg);
  padding-inline: clamp(0px, 2vw, 26px);
}

.page-about .about-section h2 {
  font-size: clamp(24px, 4.4vw, 40px);
  line-height: 1.22;
  letter-spacing: -0.015em;
  margin: 10px 0 0;
}

.page-about .about-section h3 {
  margin: 0;
}

.page-about .about-section .sec-head {
  margin-bottom: 22px;
}

.page-about .about-section .prose p {
  color: var(--about-soft);
}

.page-about .about-inline-links {
  margin-top: 26px;
  font-size: 15px;
}

.page-about .about-textlink {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 242, 214, 0.4);
}

.page-about .about-textlink:hover,
.page-about .about-textlink:focus-visible {
  border-bottom-color: var(--cyan);
}

.page-about .about-textlink__sep {
  margin: 0 10px;
  color: var(--sand);
}

/* ---------- 图版 ---------- */
.page-about .about-figure {
  margin: 6px 0 28px;
}

.page-about .about-figure--mid,
.page-about .about-figure--narrow {
  margin-top: 32px;
}

.page-about .about-figure__img img {
  width: 100%;
  border-radius: var(--r-md);
  object-fit: cover;
}

.page-about .about-figure .figure__cap {
  color: rgba(234, 242, 248, 0.55);
}

@media (min-width: 900px) {
  .page-about .about-figure--narrow {
    max-width: 560px;
  }
}

/* ---------- 说明牌 ---------- */
.page-about .plate {
  margin-top: 28px;
}

.page-about .plate__label {
  color: var(--sand);
  letter-spacing: 0.12em;
}

/* ---------- 服务网络 ---------- */
.page-about .net-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 30px;
  margin-top: 30px;
  align-items: start;
}

@media (min-width: 920px) {
  .page-about .net-grid {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr);
    gap: 44px;
  }
}

.page-about .net-map {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .net-map__line path {
  fill: none;
  stroke: rgba(53, 242, 214, 0.2);
  stroke-width: 1;
  stroke-dasharray: 3 6;
}

.page-about .net-map__city circle {
  fill: rgba(14, 42, 71, 0.92);
  stroke: var(--cyan);
  stroke-width: 1.2;
  transition: fill 160ms ease;
}

.page-about .net-map__city text,
.page-about .net-map__core text {
  font-family: var(--font-body);
  font-size: 12px;
  text-anchor: middle;
  fill: var(--mist);
}

.page-about .net-map__city:hover circle,
.page-about .net-map__city:focus-visible circle {
  fill: rgba(53, 242, 214, 0.24);
}

.page-about .net-map__core circle {
  fill: var(--cyan);
  stroke: var(--amber);
  stroke-width: 3;
}

.page-about .net-map__core text {
  fill: var(--ink-900);
  font-weight: 700;
  font-size: 13px;
}

.page-about .net-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 20px;
  margin: 14px 0 0;
  font-size: 13px;
  color: var(--about-soft);
}

.page-about .net-legend__dot {
  display: inline-block;
  width: 11px;
  height: 11px;
  margin-right: 7px;
  border-radius: 50%;
  vertical-align: middle;
}

.page-about .net-legend__dot--core {
  background: var(--cyan);
  box-shadow: 0 0 0 2px var(--amber);
}

.page-about .net-legend__dot--open {
  border: 1.5px solid var(--cyan);
}

.page-about .net-cities {
  display: grid;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .net-cities li {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 0;
  font-size: 15px;
  border-bottom: 1px solid var(--about-rule);
}

.page-about .city-item__name {
  color: var(--mist);
}

/* ---------- 服务商流程 ---------- */
.page-about .steps {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
  margin-top: 30px;
}

@media (min-width: 860px) {
  .page-about .steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 30px 40px;
  }
}

.page-about .step {
  padding-left: 18px;
  border-left: 2px solid rgba(53, 242, 214, 0.32);
}

.page-about .step__num {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--cyan);
}

.page-about .step__title {
  margin: 8px 0 8px;
  font-size: 19px;
}

.page-about .step__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--about-soft);
}

/* ---------- 价格区间 ---------- */
.page-about .price-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 20px;
  margin-top: 28px;
}

@media (min-width: 820px) {
  .page-about .price-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 24px;
  }
}

.page-about .price-card {
  padding: clamp(22px, 3vw, 32px);
  border: 1px solid var(--about-rule);
  border-radius: var(--r-lg);
  background: rgba(14, 42, 71, 0.5);
}

.page-about .price-card--std {
  border-color: rgba(255, 154, 60, 0.42);
}

.page-about .price-card__label {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--amber);
}

.page-about .price-card--eco .price-card__label {
  color: var(--cyan);
}

.page-about .price-card__name {
  margin: 8px 0 10px;
  font-family: var(--font-display);
  font-size: clamp(21px, 3vw, 28px);
  line-height: 1.25;
}

.page-about .price-card__intro {
  margin: 0 0 18px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--about-soft);
}

.page-about .price-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 12px 0;
  border-bottom: 1px dashed rgba(53, 242, 214, 0.16);
}

.page-about .price-row:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .price-row__label {
  font-size: 14px;
  color: rgba(234, 242, 248, 0.56);
}

.page-about .price-row__val {
  font-size: 14px;
  text-align: right;
  color: var(--mist);
}

/* ---------- 版本时间线 ---------- */
.page-about .timeline {
  margin-top: 28px;
}

.page-about .timeline__item {
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr);
  gap: 10px;
  padding: 14px 0;
  border-bottom: 1px solid var(--about-rule);
}

.page-about .timeline__num {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border: 1px solid rgba(53, 242, 214, 0.35);
  border-radius: 50%;
  font-size: 16px;
  color: var(--cyan);
}

.page-about .timeline__item--current .timeline__num {
  color: var(--amber);
  border-color: var(--amber);
  box-shadow: 0 0 0 4px rgba(255, 154, 60, 0.12);
}

.page-about .timeline__theme {
  font-size: 16px;
  color: var(--mist);
}

/* ---------- 折叠面板 ---------- */
.page-about .fold__head {
  display: flex;
  align-items: center;
  gap: 12px;
  width: 100%;
  padding: 4px 0;
  background: none;
  border: 0;
  color: inherit;
  font: inherit;
  text-align: left;
  cursor: pointer;
}

.page-about .timeline__fold .fold__head {
  justify-content: space-between;
}

.page-about .fold__sign {
  flex: none;
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--cyan);
}

.page-about .fold__body {
  padding: 8px 0 4px;
}

.page-about .fold__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--about-soft);
}

/* ---------- 三类角色 ---------- */
.page-about .roles {
  margin-top: 28px;
}

.page-about .role {
  border-bottom: 1px solid var(--about-rule);
  padding: 6px 0;
}

.page-about .role .fold__head {
  gap: 14px;
}

.page-about .role__name {
  flex: 1 1 auto;
  font-family: var(--font-display);
  font-size: clamp(18px, 2.6vw, 22px);
  color: var(--mist);
}

.page-about .role__count {
  flex: none;
  font-size: 13px;
  color: var(--sand);
}

/* ---------- 回访机制 ---------- */
.page-about .review-cards {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
  margin-top: 28px;
}

@media (min-width: 860px) {
  .page-about .review-cards {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 24px;
  }
}

.page-about .review-cards .plate {
  margin-top: 0;
}

/* ---------- 收尾动作 ---------- */
.page-about .about-cta {
  margin-top: clamp(44px, 7vw, 84px);
  padding: clamp(28px, 5vw, 56px);
  border: 1px solid rgba(53, 242, 214, 0.18);
  border-radius: var(--r-lg);
  background: radial-gradient(130% 130% at 0% 0%, rgba(53, 242, 214, 0.15), transparent 62%),
    rgba(14, 42, 71, 0.6);
}

.page-about .about-cta__title {
  margin: 10px 0 12px;
  font-size: clamp(23px, 3.8vw, 34px);
  line-height: 1.24;
  letter-spacing: -0.015em;
}

.page-about .about-cta__text {
  max-width: 58ch;
  margin: 0;
  font-size: 16px;
  line-height: 1.85;
  color: var(--about-soft);
}

.page-about .about-cta__acts {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 26px;
}

@media (max-width: 520px) {
  .page-about .about-cta__acts .btn {
    width: 100%;
    text-align: center;
  }

  .page-about .timeline__item {
    grid-template-columns: 44px minmax(0, 1fr);
  }

  .page-about .timeline__num {
    width: 36px;
    height: 36px;
    font-size: 14px;
  }

  .page-about .role .fold__head {
    flex-wrap: wrap;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-index__link,
  .page-about .net-map__city circle {
    transition: none;
  }
}
</main>