.page-about {
  --about-rule: rgba(47, 243, 200, 0.16);
  --about-soft: rgba(245, 241, 232, 0.74);
  --about-gap: clamp(28px, 5vw, 64px);
  background: var(--deep);
  color: var(--paper);
  overflow-x: clip;
}

.page-about h2 {
  font-family: var(--font-head);
  font-size: clamp(26px, 4.4vw, 44px);
  line-height: 1.16;
  letter-spacing: 0.02em;
  margin: 0.28em 0 0.62em;
  color: inherit;
}

.page-about h3 {
  font-family: var(--font-head);
  font-size: clamp(18px, 2.4vw, 22px);
  line-height: 1.35;
  letter-spacing: 0.02em;
  margin: 0 0 0.5em;
  color: inherit;
}

.page-about p {
  line-height: 1.78;
  margin: 0 0 1em;
}

.page-about .about-no {
  font-family: var(--font-data);
  font-size: 0.92em;
  letter-spacing: 0.1em;
  color: var(--coral);
  margin-right: 0.7em;
}

/* ---------- 首屏封面 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: calc(var(--pad) * 1.1) 0 calc(var(--pad) * 1.5);
  background:
    radial-gradient(120% 92% at 86% -12%, rgba(47, 243, 200, 0.2), transparent 58%),
    radial-gradient(92% 74% at 4% 108%, rgba(255, 107, 74, 0.15), transparent 64%),
    linear-gradient(178deg, var(--mid) 0%, var(--deep) 72%);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: repeating-linear-gradient(100deg, rgba(47, 243, 200, 0.07) 0 1px, transparent 1px 78px);
  opacity: 0.75;
}

.page-about .about-hero > .wrap {
  position: relative;
  z-index: 1;
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(26px, 4vw, 48px);
  margin-top: clamp(20px, 3vw, 36px);
}

.page-about .about-hero__title {
  font-size: clamp(32px, 7.2vw, 74px);
  line-height: 1.08;
  letter-spacing: 0.03em;
  margin: 0.18em 0 0.4em;
  color: var(--paper);
  max-width: 16em;
}

.page-about .about-hero__intro {
  max-width: 60ch;
  color: var(--about-soft);
  font-size: clamp(15px, 1.5vw, 17px);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 1.6em;
}

.page-about .about-hero__index {
  border-left: 2px solid var(--bd-neon);
  padding-left: clamp(16px, 2.4vw, 24px);
}

.page-about .about-index__head {
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--neon);
  margin: 0;
}

.page-about .about-index {
  list-style: none;
  margin: 0.9em 0 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .about-index a {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 10px 4px 10px 0;
  color: var(--paper);
  text-decoration: none;
  font-size: 15px;
  border-bottom: 1px solid rgba(245, 241, 232, 0.1);
  transition: color 0.22s var(--ease), padding-left 0.22s var(--ease);
}

.page-about .about-index a span {
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--neon);
}

.page-about .about-index a:hover,
.page-about .about-index a:focus-visible {
  color: var(--neon);
  padding-left: 6px;
}

/* ---------- 章节框架 ---------- */
.page-about .about-chapter {
  position: relative;
  padding: clamp(48px, 8vw, 100px) 0;
}

.page-about .about-chapter--deep {
  background: linear-gradient(180deg, var(--deep) 0%, var(--mid) 48%, var(--deep) 100%);
  color: var(--paper);
}

.page-about .about-chapter.on-paper {
  background: var(--paper);
  color: var(--ink);
}

.page-about .about-chapter__head {
  max-width: 62ch;
  margin-bottom: clamp(20px, 3vw, 34px);
}

.page-about .about-chapter__head .eyebrow {
  margin-bottom: 0.4em;
}

.page-about .about-chapter__lede {
  font-size: clamp(15px, 1.6vw, 17px);
  color: inherit;
  opacity: 0.82;
  max-width: 58ch;
}

/* ---------- 01 / 03 分栏 ---------- */
.page-about .about-split {
  display: grid;
  gap: var(--about-gap);
  align-items: center;
}

.page-about .about-split__text p {
  max-width: 54ch;
}

.page-about .about-split__media {
  margin: 0;
  position: relative;
}

.page-about .about-split__media img,
.page-about .about-miles__visual img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.page-about .about-facts {
  list-style: none;
  margin: 1.8em 0 0;
  padding: 1.2em 0 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  border-top: 1px solid var(--about-rule);
}

.page-about .about-facts li {
  display: grid;
  gap: 4px;
}

.page-about .about-facts strong {
  font-family: var(--font-data);
  font-size: clamp(16px, 2vw, 20px);
  color: var(--neon);
  letter-spacing: 0.04em;
}

.page-about .about-facts span {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--about-soft);
}

.page-about .about-flow {
  list-style: none;
  counter-reset: flow;
  margin: 1.4em 0 1.2em;
  padding: 0;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--about-rule);
}

.page-about .about-flow li {
  counter-increment: flow;
  display: grid;
  gap: 4px;
  padding: 14px 0 14px 34px;
  position: relative;
  border-bottom: 1px solid var(--about-rule);
}

.page-about .about-flow li::before {
  content: counter(flow, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 16px;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--coral);
}

.page-about .about-flow strong {
  font-family: var(--font-head);
  font-size: 15px;
  letter-spacing: 0.06em;
  color: var(--paper);
}

.page-about .about-flow span {
  font-size: 14px;
  line-height: 1.7;
  color: var(--about-soft);
}

.page-about .about-note {
  font-size: 14px;
  line-height: 1.75;
  color: var(--about-soft);
  border-left: 2px solid var(--bd-coral);
  padding-left: 14px;
  max-width: 52ch;
}

/* ---------- 02 时间线 ---------- */
.page-about .about-years {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding: 2px 0 14px;
  margin-bottom: 6px;
  scrollbar-width: thin;
}

.page-about .about-years a {
  flex: 0 0 auto;
  font-family: var(--font-data);
  font-size: 13px;
  letter-spacing: 0.06em;
  padding: 7px 15px;
  border-radius: 999px;
  border: 1px solid rgba(10, 15, 20, 0.22);
  color: var(--ink);
  text-decoration: none;
  transition: background 0.22s var(--ease), color 0.22s var(--ease), border-color 0.22s var(--ease);
}

.page-about .about-years a:hover,
.page-about .about-years a:focus-visible {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--paper);
}

.page-about .about-miles {
  display: grid;
  gap: clamp(22px, 3vw, 40px);
  align-items: start;
}

.page-about .about-miles__visual {
  margin: 0;
  position: relative;
  max-width: 260px;
}

.page-about .about-timeline {
  position: relative;
  padding-left: 26px;
  display: grid;
  gap: 12px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: linear-gradient(180deg, var(--coral) 0%, var(--neon) 52%, rgba(10, 74, 102, 0.16) 100%);
}

.page-about .mile {
  position: relative;
  background: rgba(255, 255, 255, 0.62);
  border: 1px solid rgba(10, 15, 20, 0.12);
  border-radius: 4px;
}

.page-about .mile::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 21px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--paper);
  border: 2px solid var(--coral);
}

.page-about .mile[open]::before {
  background: var(--coral);
  border-color: var(--coral);
}

.page-about .mile__sum {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 6px 12px;
  align-items: baseline;
  padding: 15px 16px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-head);
}

.page-about .mile__sum::-webkit-details-marker {
  display: none;
}

.page-about .mile__sum::after {
  content: "+";
  font-family: var(--font-data);
  font-size: 18px;
  line-height: 1;
  color: var(--lane);
  transition: transform 0.24s var(--ease);
}

.page-about .mile[open] .mile__sum::after {
  content: "−";
  color: var(--coral);
}

.page-about .mile__year {
  grid-column: 1 / -1;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--coral);
}

.page-about .mile__title {
  font-size: clamp(16px, 2vw, 19px);
  line-height: 1.4;
  color: var(--ink);
  letter-spacing: 0.02em;
}

.page-about .mile__body {
  padding: 0 16px 16px;
}

.page-about .mile__body p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: rgba(10, 15, 20, 0.78);
  max-width: 56ch;
}

/* ---------- 04 数据与取舍 ---------- */
.page-about .about-stats {
  display: grid;
  gap: 12px;
  grid-template-columns: 1fr;
  margin-bottom: clamp(26px, 4vw, 42px);
}

.page-about .about-stat {
  display: grid;
  gap: 6px;
  padding: 18px 18px 16px;
  border: 1px solid rgba(10, 15, 20, 0.14);
  border-left: 3px solid var(--lane);
  background: rgba(255, 255, 255, 0.55);
}

.page-about .about-stat__num {
  font-family: var(--font-data);
  font-size: clamp(30px, 5vw, 46px);
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--lane);
}

.page-about .about-stat__num--coral {
  color: var(--coral);
}

.page-about .about-stat .stat__label {
  font-size: 13px;
  line-height: 1.6;
  letter-spacing: 0.04em;
  color: rgba(10, 15, 20, 0.72);
}

.page-about .about-swap {
  display: grid;
  gap: clamp(20px, 3vw, 34px);
}

.page-about .about-swap__col {
  padding-top: 16px;
  border-top: 3px solid var(--ink);
}

.page-about .about-swap__col h3 {
  color: var(--ink);
}

.page-about .about-swap__col p {
  color: rgba(10, 15, 20, 0.78);
  font-size: 15px;
  max-width: 48ch;
  margin: 0;
}

/* ---------- 05 在地服务 ---------- */
.page-about .about-local {
  display: grid;
  gap: var(--about-gap);
  align-items: start;
}

.page-about .about-local__text p {
  max-width: 54ch;
  color: var(--about-soft);
}

.page-about .about-local__text h2 {
  color: var(--paper);
}

.page-about .about-local__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 1.6em;
}

.page-about .about-ticket {
  position: relative;
  padding: clamp(20px, 3vw, 28px);
  background: linear-gradient(160deg, rgba(11, 43, 69, 0.95), rgba(6, 27, 44, 0.92));
  border: 1px solid var(--bd-neon);
  border-radius: 4px;
  box-shadow: 0 18px 40px -28px rgba(0, 0, 0, 0.9);
}

.page-about .about-ticket::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--coral), var(--neon));
}

.page-about .about-ticket__head {
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--neon);
  margin: 0 0 1em;
}

.page-about .about-ticket__list {
  margin: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-ticket__list dt {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: rgba(245, 241, 232, 0.56);
  margin-bottom: 3px;
}

.page-about .about-ticket__list dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.6;
  color: var(--paper);
  word-break: break-word;
}

.page-about .about-ticket__note {
  margin: 1.2em 0 0;
  padding-top: 0.9em;
  border-top: 1px dashed rgba(245, 241, 232, 0.2);
  font-size: 13px;
  line-height: 1.7;
  color: rgba(245, 241, 232, 0.66);
}

/* ---------- 06 下一步 ---------- */
.page-about .about-next {
  display: grid;
  gap: 14px;
}

.page-about .about-next__card {
  display: grid;
  gap: 8px;
  align-content: start;
  padding: 22px 20px 20px;
  background: rgba(255, 255, 255, 0.6);
  border: 1px solid rgba(10, 15, 20, 0.14);
  border-radius: 4px;
  text-decoration: none;
  color: var(--ink);
  transition: transform 0.24s var(--ease), border-color 0.24s var(--ease), background 0.24s var(--ease);
}

.page-about .about-next__card:hover,
.page-about .about-next__card:focus-visible {
  transform: translateY(-3px);
  border-color: var(--lane);
  background: #fff;
}

.page-about .about-next__tag {
  justify-self: start;
}

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

.page-about .about-next__card p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: rgba(10, 15, 20, 0.76);
}

.page-about .about-next__go {
  margin-top: 6px;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--lane);
  border-bottom: 1px solid rgba(16, 74, 102, 0.4);
  justify-self: start;
  padding-bottom: 2px;
}

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

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

  .page-about .mile__sum {
    grid-template-columns: 92px 1fr auto;
    align-items: baseline;
    padding: 16px 18px;
  }

  .page-about .mile__year {
    grid-column: auto;
  }

  .page-about .mile__body {
    padding: 0 18px 18px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.42fr) minmax(0, 0.58fr);
    align-items: end;
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  }

  .page-about .about-split--reverse {
    grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
  }

  .page-about .about-split--reverse .about-split__media {
    order: -1;
  }

  .page-about .about-miles {
    grid-template-columns: 260px minmax(0, 1fr);
  }

  .page-about .about-miles__visual {
    position: sticky;
    top: 24px;
    max-width: none;
  }

  .page-about .about-swap {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: clamp(28px, 5vw, 56px);
  }

  .page-about .about-local {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  }

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