.page-about {
  --about-glow: rgba(47, 224, 200, .3);
  --about-tint: rgba(47, 224, 200, .08);
  background: var(--blue-deep);
  color: var(--text);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(30px, 6vw, 76px) 0 clamp(26px, 4vw, 46px);
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(120% 78% at 6% -4%, rgba(47, 224, 200, .15), transparent 58%),
    radial-gradient(84% 62% at 102% 4%, rgba(110, 108, 147, .2), transparent 60%);
}

.page-about .about-hero__inner {
  display: block;
}

.page-about .about-hero__kicker {
  margin: 18px 0 0;
  font-size: 12.5px;
  letter-spacing: .08em;
  color: var(--cyan);
  opacity: .85;
}

.page-about .about-hero__title {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-size: clamp(27px, 5.6vw, 45px);
  font-weight: 800;
  line-height: 1.24;
  letter-spacing: -.02em;
  color: var(--text);
  text-wrap: balance;
}

.page-about .about-hero__lead {
  margin: 16px 0 0;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--text-dim);
}

/* ---------- 章节索引 ---------- */
.page-about .about-index {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin-top: clamp(26px, 4vw, 42px);
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-index__link {
  display: flex;
  align-items: center;
  gap: 12px;
  min-height: 46px;
  padding: 12px 16px;
  background: var(--blue-panel);
  color: var(--text);
  font-size: 15px;
  line-height: 1.5;
  text-decoration: none;
  transition: background var(--dur ease), color var(--dur ease);
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  background: rgba(47, 224, 200, .11);
  color: var(--cyan);
}

.page-about .about-index__no {
  flex: none;
  font-size: 12.5px;
  color: var(--cyan);
}

.page-about .about-index__name {
  flex: 1 1 auto;
}

/* ---------- 通用章节骨架 ---------- */
.page-about .about-sec {
  padding: clamp(40px, 7vw, 86px) 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-sec:last-of-type {
  border-bottom: 0;
}

.page-about .about-sec__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .about-sec__no {
  font-size: 26px;
  line-height: 1;
  letter-spacing: .05em;
  color: var(--cyan);
  opacity: .8;
}

.page-about .about-sec__title {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-size: clamp(21px, 4vw, 31px);
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -.01em;
  color: var(--text);
}

.page-about .about-sec__text {
  margin: 0 0 15px;
  max-width: 66ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--text);
}

.page-about .about-sec__text a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

.page-about .about-sec__text a:hover,
.page-about .about-sec__text a:focus-visible {
  color: var(--gold);
}

/* ---------- 引用块 ---------- */
.page-about .about-quote {
  margin: 22px 0 0;
  padding: 16px 18px;
  border-left: 3px solid var(--cyan);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  background: var(--about-tint);
}

.page-about .about-quote p {
  margin: 0;
  font-size: 16px;
  line-height: 1.82;
  color: var(--text);
}

/* ---------- 服务人群 ---------- */
.page-about .about-people {
  display: grid;
  grid-template-columns: 1fr;
  gap: 22px;
  margin-top: 6px;
}

.page-about .about-people__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
  align-content: start;
}

.page-about .about-people__list li {
  position: relative;
  padding: 12px 14px 12px 36px;
  background: rgba(16, 36, 58, .62);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  font-size: 15px;
  line-height: 1.78;
  color: var(--text);
}

.page-about .about-people__list li::before {
  content: "";
  position: absolute;
  left: 14px;
  top: 20px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--lime);
  box-shadow: 0 0 8px rgba(123, 227, 143, .5);
}

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

.page-about .about-people__media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--radius-sm);
}

/* ---------- 数据条 ---------- */
.page-about .about-stats-band {
  padding: clamp(26px, 5vw, 46px) 0;
  border-bottom: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(16, 36, 58, .55), rgba(8, 23, 38, .98));
}

.page-about .about-stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
  scrollbar-color: var(--line) transparent;
}

.page-about .about-stats::-webkit-scrollbar {
  height: 4px;
}

.page-about .about-stats::-webkit-scrollbar-thumb {
  background: var(--line);
  border-radius: 2px;
}

.page-about .about-stats__item {
  flex: 0 0 72%;
  scroll-snap-align: start;
  display: flex;
  flex-direction: column;
  gap: 7px;
  padding: 20px 18px;
  background: var(--blue-panel);
}

.page-about .about-stats__num {
  font-size: clamp(27px, 6vw, 38px);
  font-weight: 600;
  line-height: 1;
  letter-spacing: -.01em;
  color: var(--gold);
}

.page-about .about-stats__label {
  font-size: 13.5px;
  line-height: 1.66;
  color: var(--text-dim);
}

/* ---------- 时间轴 ---------- */
.page-about .timeline {
  list-style: none;
  position: relative;
  margin: 24px 0 0;
  padding: 0 0 0 24px;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 12px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--cyan), rgba(47, 224, 200, .07));
  box-shadow: 0 0 14px var(--about-glow);
}

.page-about .timeline__item {
  position: relative;
  padding: 0 0 26px;
}

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

.page-about .timeline__dot {
  position: absolute;
  left: -24px;
  top: 5px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(47, 224, 200, .14), 0 0 12px var(--about-glow);
}

.page-about .timeline__stage {
  display: inline-block;
  margin: 0 0 7px;
  padding: 3px 9px;
  font-size: 12px;
  letter-spacing: .05em;
  color: var(--cyan);
  background: var(--about-tint);
  border-radius: 999px;
}

.page-about .timeline__title {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: clamp(17px, 2.8vw, 20px);
  font-weight: 700;
  line-height: 1.4;
  color: var(--text);
}

.page-about .timeline__text {
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.82;
  color: var(--text-dim);
}

.page-about .about-road__media {
  margin: 28px 0 0;
}

.page-about .about-road__media img,
.page-about .about-ops__media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--radius-sm);
}

/* ---------- 内容运营 ---------- */
.page-about .about-ops {
  display: grid;
  grid-template-columns: 1fr;
  gap: 22px;
  margin-top: 18px;
}

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

.page-about .about-ops__list {
  list-style: none;
  margin: 4px 0 16px;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about .about-ops__list li {
  display: grid;
  grid-template-columns: 96px minmax(0, 1fr);
  gap: 12px;
  padding: 12px 0;
  border-top: 1px solid var(--line);
  font-size: 15px;
  line-height: 1.78;
  color: var(--text);
}

.page-about .about-ops__list li:last-child {
  border-bottom: 1px solid var(--line);
}

.page-about .about-ops__key {
  font-size: 12.5px;
  color: var(--gold);
  line-height: 1.9;
}

.page-about .about-ops__tail {
  margin-bottom: 0;
}

/* ---------- 三条承诺 ---------- */
.page-about .pledge {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .pledge__item {
  position: relative;
  padding: 22px 20px 24px;
  background: rgba(16, 36, 58, .62);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .pledge__item::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--cyan), transparent);
}

.page-about .pledge__item:nth-child(2)::after {
  background: linear-gradient(90deg, var(--gold), transparent);
}

.page-about .pledge__item:nth-child(3)::after {
  background: linear-gradient(90deg, var(--violet), transparent);
}

.page-about .pledge__no {
  display: block;
  margin-bottom: 10px;
  font-size: 12.5px;
  color: var(--cyan);
}

.page-about .pledge__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--text);
}

.page-about .pledge__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-dim);
}

/* ---------- 收束 ---------- */
.page-about .about-cta {
  margin-top: 28px;
  padding: 20px 20px 22px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--gold);
  border-radius: var(--radius);
  background: rgba(16, 36, 58, .5);
}

.page-about .about-cta__text {
  margin: 0 0 16px;
  max-width: 56ch;
  font-size: 15.5px;
  line-height: 1.82;
  color: var(--text);
}

.page-about .about-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .about-cta__links .btn {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

/* ---------- 平板及以上 ---------- */
@media (min-width: 720px) {
  .page-about .about-index {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-people {
    grid-template-columns: minmax(0, 1fr) 258px;
    gap: 30px;
    align-items: start;
  }

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

  .page-about .about-stats__item {
    flex: none;
    padding: 26px 20px;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 880px) {
  .page-about .about-sec__grid {
    grid-template-columns: 106px minmax(0, 1fr);
    gap: clamp(24px, 4vw, 58px);
    align-items: start;
  }

  .page-about .about-sec__no {
    font-size: clamp(44px, 4.6vw, 66px);
    opacity: .92;
    padding-top: 2px;
  }

  .page-about .about-ops {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, 1fr);
    gap: 32px;
    align-items: start;
  }

  .page-about .pledge {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .about-index {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-index__link {
    transition: none;
  }
}