.page-about {
  --about-line: rgba(215, 226, 234, 0.16);
  --about-line-strong: rgba(215, 226, 234, 0.32);
  --about-slip-bg: #F2F7FA;
  --about-slip-ink: #0A0C10;
  background: var(--ink);
  color: var(--paper);
  padding-bottom: clamp(40px, 7vw, 96px);
}

.page-about .about-crumbs {
  padding: clamp(14px, 3vw, 24px) 0 0;
}

.page-about .breadcrumbs__link,
.page-about .breadcrumbs__item--current {
  color: var(--mute);
}

.page-about .breadcrumbs__link:hover {
  color: var(--flame);
}

/* 首屏 */
.page-about .about-hero {
  display: grid;
  gap: clamp(22px, 4vw, 40px);
  padding: clamp(18px, 4vw, 40px) 0 clamp(34px, 6vw, 72px);
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-hero__title {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(38px, 8.4vw, 96px);
  line-height: 0.98;
  letter-spacing: -0.03em;
  color: var(--white);
  max-width: 15em;
}

.page-about .about-hero__lead {
  margin: clamp(16px, 3vw, 26px) 0 0;
  max-width: 40em;
  font-size: clamp(15px, 1.7vw, 18px);
  line-height: 1.8;
  color: var(--ice);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  background: var(--about-line);
  border: 1px solid var(--about-line);
}

.page-about .about-hero__fact {
  background: var(--ink-2);
  padding: 14px 14px 16px;
}

.page-about .about-hero__fact dt {
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--mute);
}

.page-about .about-hero__fact dd {
  margin: 6px 0 0;
  font-family: var(--font-mono);
  font-size: clamp(24px, 4vw, 34px);
  font-weight: 700;
  line-height: 1;
  color: var(--flame);
}

/* 左侧年份导轨 + 右侧叙事流 */
.page-about .about-frame {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
  padding-top: clamp(28px, 5vw, 56px);
}

.page-about .about-rail {
  border-top: 1px solid var(--about-line);
  padding-top: 14px;
}

.page-about .about-rail__label {
  margin: 0 0 10px;
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--mute);
}

.page-about .about-rail__list {
  display: flex;
  gap: 10px;
  margin: 0;
  padding: 0 0 6px;
  list-style: none;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-rail__item {
  flex: 0 0 auto;
}

.page-about .about-rail__link {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 12px;
  border: 1px solid var(--about-line);
  color: var(--ice);
  text-decoration: none;
  transition: border-color 0.2s ease, color 0.2s ease, background-color 0.2s ease;
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  border-color: var(--flame);
  color: var(--white);
  background: rgba(255, 90, 54, 0.12);
  outline: none;
}

.page-about .about-rail__num {
  font-size: 15px;
  font-weight: 700;
  color: var(--flame);
}

.page-about .about-rail__txt {
  font-size: 12px;
  color: var(--mute);
  white-space: nowrap;
}

.page-about .about-flow {
  display: grid;
  gap: clamp(30px, 5vw, 64px);
  min-width: 0;
}

/* 区块通用 */
.page-about .about-sec {
  display: grid;
  gap: clamp(14px, 2.4vw, 22px);
  min-width: 0;
}

.page-about .about-sec + .about-sec {
  border-top: 1px solid var(--about-line);
  padding-top: clamp(30px, 5vw, 60px);
}

.page-about .about-sec__head {
  display: grid;
  gap: 8px;
}

.page-about .about-sec .section-heading {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(26px, 4.2vw, 46px);
  line-height: 1.12;
  letter-spacing: -0.02em;
  color: var(--white);
}

.page-about .about-sec__lead {
  margin: 0;
  max-width: 40em;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.8;
  color: var(--ice);
}

/* 叠层纸条 */
.page-about .about-slip {
  position: relative;
  background: var(--about-slip-bg);
  color: var(--about-slip-ink);
  padding: clamp(20px, 3.4vw, 34px);
  border: 1px solid var(--black);
  box-shadow:
    6px 6px 0 -1px var(--ink),
    6px 6px 0 0 var(--about-line-strong),
    12px 12px 0 -1px var(--ink),
    12px 12px 0 0 var(--about-line-strong);
  margin-bottom: 16px;
}

.page-about .about-slip p {
  margin: 0 0 14px;
  font-size: clamp(14.5px, 1.6vw, 16.5px);
  line-height: 1.85;
  color: var(--about-slip-ink);
}

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

.page-about .about-slip .paper__label {
  margin-bottom: 10px;
}

.page-about .about-slip--eco {
  margin-top: clamp(16px, 3vw, 26px);
}

/* 图片 */
.page-about .about-figure {
  margin: 0;
  border: 1px solid var(--about-line-strong);
  background: var(--ink-2);
  overflow: hidden;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(0.92) contrast(1.05);
}

.page-about .about-figure .media-frame__caption {
  display: block;
  padding: 10px 14px;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--mute);
  border-top: 1px solid var(--about-line);
}

/* 班组 */
.page-about .crew-list {
  display: grid;
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .crew-item {
  padding: clamp(16px, 2.6vw, 24px);
  background: var(--ink-2);
  border: 1px solid var(--about-line);
  border-left: 3px solid var(--flame);
}

.page-about .crew-item__title {
  margin: 12px 0 8px;
  font-size: clamp(17px, 2vw, 20px);
  font-weight: 700;
  line-height: 1.35;
  color: var(--white);
}

.page-about .crew-item p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--ice);
}

/* 时间线 */
.page-about .timeline {
  position: relative;
  display: grid;
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 12px;
  bottom: 12px;
  width: 1px;
  background: var(--about-line-strong);
}

.page-about .timeline__item {
  position: relative;
  overflow: hidden;
  padding: clamp(16px, 2.6vw, 24px) clamp(16px, 2.6vw, 24px) clamp(16px, 2.6vw, 24px) 32px;
  background: var(--ink-2);
  border: 1px solid var(--about-line);
  scroll-margin-top: 90px;
}

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 26px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--ink);
  border: 1px solid var(--mute);
}

.page-about .timeline__item--now::before {
  background: var(--live);
  border-color: var(--live);
  box-shadow: 0 0 0 4px rgba(46, 242, 195, 0.16);
}

.page-about .timeline__ghost {
  position: absolute;
  right: -6px;
  bottom: -18px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(64px, 15vw, 128px);
  line-height: 0.8;
  letter-spacing: -0.04em;
  color: rgba(215, 226, 234, 0.07);
  pointer-events: none;
  user-select: none;
}

.page-about .timeline__year {
  margin: 0;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--flame);
}

.page-about .timeline__title {
  position: relative;
  margin: 6px 0 8px;
  font-size: clamp(17px, 2vw, 21px);
  font-weight: 700;
  color: var(--white);
}

.page-about .timeline__text {
  position: relative;
  margin: 0;
  max-width: 40em;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--ice);
}

/* 赛区点阵 */
.page-about .zone-map {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .zone-cell {
  position: relative;
  display: grid;
  gap: 4px;
  padding: 12px 10px;
  background: var(--ink-2);
  border: 1px solid var(--about-line);
  transition: border-color 0.2s ease, transform 0.2s ease, background-color 0.2s ease;
}

.page-about .zone-cell:hover,
.page-about .zone-cell:focus-visible {
  border-color: var(--live);
  background: #103445;
  transform: translateY(-2px);
  outline: none;
}

.page-about .zone-cell__no {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--live);
}

.page-about .zone-cell__name {
  font-size: 13px;
  color: var(--paper);
}

.page-about .zone-cell__proj {
  position: absolute;
  left: 0;
  right: 0;
  bottom: calc(100% + 6px);
  padding: 6px 8px;
  background: var(--paper);
  color: var(--black);
  font-size: 11px;
  line-height: 1.4;
  border: 1px solid var(--black);
  opacity: 0;
  visibility: hidden;
  transform: translateY(4px);
  transition: opacity 0.18s ease, transform 0.18s ease, visibility 0.18s;
  pointer-events: none;
  z-index: 3;
}

.page-about .zone-cell:hover .zone-cell__proj,
.page-about .zone-cell:focus-visible .zone-cell__proj {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

/* 使用场景 */
.page-about .scene-grid {
  display: grid;
  gap: 12px;
}

.page-about .scene-card {
  padding: 16px 16px 18px;
  border: 1px solid var(--about-line);
  background: linear-gradient(160deg, rgba(255, 90, 54, 0.1), rgba(14, 42, 58, 0) 62%);
}

.page-about .scene-card__title {
  margin: 0 0 8px;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--flame);
}

.page-about .scene-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ice);
}

/* 团队折叠 */
.page-about .fold {
  border: 1px solid var(--about-line);
  background: var(--ink-2);
}

.page-about .fold + .fold {
  margin-top: 10px;
}

.page-about .fold__head {
  padding: 14px 16px;
  font-size: 15px;
  font-weight: 700;
  color: var(--paper);
  cursor: pointer;
  list-style: none;
}

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

.page-about .fold__head::after {
  content: "＋";
  float: right;
  font-family: var(--font-mono);
  color: var(--flame);
}

.page-about .fold[open] .fold__head::after {
  content: "－";
}

.page-about .fold__head:hover {
  color: var(--white);
}

.page-about .fold__head:focus-visible {
  outline: 2px solid var(--live);
  outline-offset: -2px;
}

.page-about .fold__body {
  padding: 0 16px 16px;
  border-top: 1px solid var(--about-line);
}

.page-about .fold__body p {
  margin: 12px 0 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--ice);
}

/* 荣誉与服务 */
.page-about .honor-band {
  padding: clamp(18px, 3vw, 26px);
  background: var(--ink-2);
  border: 1px solid var(--about-line-strong);
  border-left: 4px solid var(--amber);
}

.page-about .honor-band__text {
  margin: 12px 0 0;
  max-width: 42em;
  font-size: clamp(15px, 1.7vw, 17px);
  line-height: 1.8;
  color: var(--paper);
}

.page-about .service-grid {
  display: grid;
  gap: 1px;
  background: var(--about-line);
  border: 1px solid var(--about-line);
}

.page-about .service-item {
  background: var(--ink-3);
  padding: 16px;
}

.page-about .service-item__k {
  margin: 0 0 8px;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--live);
}

.page-about .service-item__v {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ice);
}

/* 行动条带 */
.page-about .about-cta {
  display: grid;
  gap: 18px;
  padding: clamp(20px, 3.4vw, 32px);
  background: var(--ink-2);
  border: 1px solid var(--about-line-strong);
  border-left: 6px solid var(--flame);
}

.page-about .about-cta__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(20px, 3vw, 28px);
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .about-cta__copy p {
  margin: 0;
  max-width: 38em;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--ice);
}

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

@media (min-width: 640px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

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

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

@media (min-width: 900px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1fr) 250px;
    align-items: start;
    gap: clamp(28px, 4vw, 56px);
  }

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

  .page-about .about-frame {
    grid-template-columns: 190px minmax(0, 1fr);
    gap: clamp(32px, 4vw, 72px);
  }

  .page-about .about-rail {
    position: sticky;
    top: 96px;
    align-self: start;
    border-top: none;
    border-left: 1px solid var(--about-line);
    padding: 4px 0 4px 18px;
  }

  .page-about .about-rail__list {
    flex-direction: column;
    gap: 4px;
    overflow: visible;
    padding: 0;
  }

  .page-about .about-rail__link {
    flex-direction: column;
    align-items: flex-start;
    gap: 2px;
    padding: 8px 10px;
    border-color: transparent;
    border-left: 2px solid transparent;
  }

  .page-about .about-rail__link:hover,
  .page-about .about-rail__link:focus-visible {
    border-color: transparent;
    border-left-color: var(--flame);
    background: rgba(255, 90, 54, 0.1);
  }

  .page-about .about-rail__num {
    font-size: 22px;
    line-height: 1;
  }

  .page-about .zone-map {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }

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

@media (min-width: 1100px) {
  .page-about .about-flow {
    max-width: 900px;
  }

  .page-about .crew-list {
    gap: 16px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .zone-cell,
  .page-about .zone-cell__proj,
  .page-about .about-rail__link {
    transition: none;
  }

  .page-about .zone-cell:hover,
  .page-about .zone-cell:focus-visible {
    transform: none;
  }
}