.page-about {
  --about-line: rgba(30, 144, 255, 0.28);
  --about-soft-bg: rgba(240, 248, 255, 0.72);
  --about-shadow: 0 12px 32px rgba(11, 42, 74, 0.10);
  color: var(--text-high);
  background:
    radial-gradient(800px 340px at 110% 12%, rgba(255, 107, 53, 0.08), transparent 60%),
    radial-gradient(700px 420px at -10% 32%, rgba(30, 144, 255, 0.10), transparent 55%),
    linear-gradient(180deg, var(--ice-white) 0%, #ffffff 38%, var(--ice-white) 100%);
  overflow-x: hidden;
}

.page-about .about-hero .container,
.page-about .about-origin .container,
.page-about .about-milestone .container,
.page-about .about-archive .container,
.page-about .about-culture .container,
.page-about .about-future .container {
  box-sizing: border-box;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* ========== 首屏封面 ========== */
.page-about .about-hero {
  position: relative;
  padding: 40px 0 72px;
  background:
    radial-gradient(900px 360px at 88% -8%, rgba(255, 107, 53, 0.22), transparent 62%),
    radial-gradient(760px 420px at 4% 18%, rgba(30, 144, 255, 0.32), transparent 58%),
    var(--glacier-deep);
  color: var(--ice-white);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(120deg, transparent 0%, transparent 62%, rgba(255, 107, 53, 0.14) 63%, rgba(255, 107, 53, 0.14) 68%, transparent 69%),
    linear-gradient(45deg, transparent 0%, transparent 78%, rgba(30, 144, 255, 0.16) 79%, transparent 80%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 6px;
  background: linear-gradient(90deg, var(--glacier-bright) 0%, var(--lava-orange) 55%, var(--lava-orange) 76%, transparent 76%);
  opacity: 0.85;
}

.page-about .about-hero__est {
  position: absolute;
  top: 36px;
  right: 20px;
  font-family: var(--font-head);
  font-size: 44px;
  font-weight: 700;
  line-height: 0.9;
  text-align: right;
  letter-spacing: 0.04em;
  color: rgba(240, 248, 255, 0.14);
  transform: skewX(-4deg);
  pointer-events: none;
}

.page-about .about-hero .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: rgba(240, 248, 255, 0.68);
}

.page-about .about-hero .breadcrumb a {
  color: rgba(240, 248, 255, 0.8);
  text-decoration-color: rgba(255, 107, 53, 0.6);
  text-underline-offset: 3px;
}

.page-about .about-hero__content {
  position: relative;
  z-index: 1;
  max-width: 880px;
  padding-top: 36px;
}

.page-about .about-hero__eyebrow {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--lava-orange);
}

.page-about .about-hero .page-title {
  margin: 0 0 20px;
  font-family: var(--font-head);
  font-size: clamp(40px, 9vw, 72px);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: 0.01em;
  transform: skewX(-2deg);
  text-shadow: 0 2px 24px rgba(30, 144, 255, 0.35);
}

.page-about .about-hero .page-title span {
  display: block;
  margin-top: 8px;
  font-size: 0.42em;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--lava-orange);
  text-shadow: none;
}

.page-about .about-hero__desc {
  max-width: 640px;
  margin: 0 0 24px;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(240, 248, 255, 0.88);
}

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

.page-about .about-hero .tag-chip {
  background: rgba(240, 248, 255, 0.12);
  border: 1px solid rgba(240, 248, 255, 0.18);
  color: var(--ice-white);
  backdrop-filter: blur(6px);
}

.page-about .about-hero .tag-chip--orange {
  background: rgba(255, 107, 53, 0.88);
  border-color: rgba(255, 107, 53, 0.35);
}

.page-about .about-hero .tag-chip--green {
  background: rgba(0, 200, 150, 0.18);
  border-color: rgba(0, 200, 150, 0.35);
  color: #BFF3E5;
}

/* ========== 章节标题体系 ========== */
.page-about .section-head {
  margin-bottom: 32px;
  position: relative;
}

.page-about .section-head .section-sub {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--lava-orange);
}

.page-about .section-head .section-title {
  margin: 0;
  font-family: var(--font-head);
  font-size: clamp(28px, 6vw, 44px);
  font-weight: 700;
  line-height: 1.12;
  transform: skewX(-2deg);
  color: var(--text-high);
}

.page-about .section-title::after {
  content: "";
  display: block;
  width: 64px;
  height: 4px;
  margin-top: 14px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--glacier-bright), var(--lava-orange));
}

/* ========== 品牌起源 ========== */
.page-about .about-origin {
  padding: 64px 0 24px;
}

.page-about .about-origin__grid {
  display: grid;
  gap: 28px;
}

.page-about .about-origin__text p,
.page-about .about-archive__content p,
.page-about .about-culture__text p {
  margin: 0 0 16px;
  font-size: 15px;
  line-height: 1.9;
  color: var(--text-mid);
}

.page-about .about-origin__stats {
  display: grid;
  gap: 16px;
}

.page-about .about-origin__stat {
  padding: 20px;
  border-radius: var(--radius);
}

.page-about .about-origin__stat-num {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 34px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--lava-orange);
}

.page-about .about-origin__stat h3,
.page-about .about-archive__panel h3 {
  margin: 0 0 6px;
  font-family: var(--font-head);
  font-size: 18px;
  font-weight: 700;
  color: var(--ice-white);
}

.page-about .about-origin__stat p:last-child,
.page-about .about-archive__panel p:last-child {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: rgba(240, 248, 255, 0.72);
}

/* ========== 发展里程碑 / 时间轴 ========== */
.page-about .about-milestone {
  padding: 48px 0 24px;
}

.page-about .about-milestone__hero {
  margin: 0 0 40px;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--about-shadow);
}

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

.page-about .about-timeline {
  position: relative;
  margin: 0 0 32px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  border-radius: 2px;
  opacity: 0.5;
  background: linear-gradient(180deg, var(--glacier-bright), var(--lava-orange));
}

.page-about .timeline-item {
  margin-bottom: 18px;
}

.page-about .timeline-item__summary {
  position: relative;
  display: block;
  padding-left: 32px;
  list-style: none;
  cursor: pointer;
}

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

.page-about .timeline-item__year {
  display: block;
  width: auto;
}

.page-about .timeline-item__year .data-mono {
  display: inline-block;
  font-family: var(--font-head);
  font-size: 34px;
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: 0.02em;
  transform: skewX(-2deg);
  color: var(--glacier-bright);
}

.page-about .timeline-item__year::before {
  content: "";
  position: absolute;
  left: -32px;
  top: 12px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--lava-orange);
  box-shadow: 0 0 0 5px rgba(255, 107, 53, 0.18), 0 0 14px var(--glow);
}

.page-about .timeline-item__card {
  margin-top: 6px;
  padding: 16px 18px;
  border: 1px solid rgba(30, 144, 255, 0.12);
  border-radius: var(--radius);
  background: var(--about-soft-bg);
  backdrop-filter: blur(8px);
}

.page-about .timeline-item__card h3 {
  margin: 0 0 6px;
  font-family: var(--font-head);
  font-size: 20px;
  font-weight: 700;
  color: var(--glacier-deep);
}

.page-about .timeline-item__card p {
  margin: 0;
  font-size: 13px;
  line-height: 1.75;
  color: var(--text-mid);
}

.page-about .timeline-item__expand {
  margin: 10px 0 10px 32px;
  padding: 14px 18px;
  border-left: 3px solid var(--lava-orange);
  border-radius: 0 var(--radius) var(--radius) 0;
  background: rgba(240, 248, 255, 0.6);
  font-size: 13px;
  line-height: 1.75;
  color: var(--text-mid);
}

.page-about .timeline-item__expand p {
  margin: 0;
}

.page-about .timeline-item[open] .timeline-item__expand {
  animation: aboutExpand 0.36s var(--ease);
}

@keyframes aboutExpand {
  from {
    opacity: 0;
    transform: translateY(-6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ========== 赛事年鉴品牌更替周期解析 ========== */
.page-about .about-archive {
  padding: 48px 0 24px;
}

.page-about .about-archive__grid {
  display: grid;
  gap: 28px;
}

.page-about .about-archive__points {
  display: grid;
  gap: 10px;
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-archive__points li {
  position: relative;
  padding-left: 24px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-high);
}

.page-about .about-archive__points li::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 0.74em;
  width: 8px;
  height: 8px;
  border-radius: 2px;
  background: var(--lava-orange);
  transform: rotate(45deg);
}

.page-about .about-archive__img {
  margin: 0;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--about-shadow);
}

.page-about .about-archive__panels {
  display: grid;
  gap: 16px;
  margin-top: 32px;
}

.page-about .about-archive__panel {
  padding: 20px 22px;
  border-radius: var(--radius);
}

.page-about .about-archive__panel .data-mono {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 28px;
  font-weight: 700;
  color: var(--lava-orange);
}

/* ========== 团队文化 ========== */
.page-about .about-culture {
  padding: 48px 0 24px;
}

.page-about .about-culture__grid {
  display: grid;
  gap: 28px;
  align-items: center;
}

.page-about .about-culture__img {
  margin: 0;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--about-shadow);
}

/* ========== 下一个五年 ========== */
.page-about .about-future {
  padding: 48px 0 72px;
}

.page-about .about-future__grid {
  display: grid;
  gap: 18px;
}

.page-about .about-future__item {
  padding: 24px;
  border-radius: var(--radius);
}

.page-about .about-future__item p {
  margin: 14px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-mid);
}

.page-about .about-future__note {
  display: grid;
  gap: 8px;
  margin-top: 40px;
  padding: 20px 22px;
  border-radius: var(--radius);
  background: linear-gradient(135deg, rgba(11, 42, 74, 0.92), rgba(11, 42, 74, 0.82));
  color: var(--ice-white);
}

.page-about .about-future__note .data-mono {
  margin: 0;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--lava-orange);
}

.page-about .about-future__note p:last-child {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: rgba(240, 248, 255, 0.72);
}

.page-about .about-future__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 28px;
}

.page-about .about-future__cta .btn {
  padding: 12px 24px;
  border-radius: 8px;
}

/* ========== 桌面端 ========== */
@media (min-width: 860px) {
  .page-about .about-hero {
    padding: 56px 0 104px;
  }

  .page-about .about-hero .container,
  .page-about .about-origin .container,
  .page-about .about-milestone .container,
  .page-about .about-archive .container,
  .page-about .about-culture .container,
  .page-about .about-future .container {
    padding: 0 32px;
  }

  .page-about .about-hero__est {
    top: 56px;
    right: 64px;
    font-size: 92px;
  }

  .page-about .about-hero__content {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 28px 56px;
    align-items: end;
    max-width: 1160px;
    padding-top: 56px;
  }

  .page-about .about-hero__eyebrow {
    grid-column: 1 / -1;
  }

  .page-about .about-hero .page-title {
    margin-bottom: 0;
    font-size: clamp(56px, 7vw, 84px);
  }

  .page-about .about-hero__desc {
    margin-bottom: 20px;
    font-size: 16px;
  }

  .page-about .section-head {
    margin-bottom: 44px;
  }

  .page-about .about-origin,
  .page-about .about-milestone,
  .page-about .about-archive,
  .page-about .about-culture,
  .page-about .about-future {
    padding-top: 72px;
  }

  .page-about .about-origin__grid {
    grid-template-columns: 1.05fr 0.95fr;
    gap: 56px;
    align-items: start;
  }

  .page-about .about-origin__stats {
    grid-template-columns: 1fr 1fr;
    gap: 20px;
  }

  .page-about .about-origin__stat:last-child {
    grid-column: 1 / -1;
  }

  .page-about .about-timeline {
    margin: 0 0 64px;
  }

  .page-about .about-timeline::before {
    left: 50%;
    transform: translateX(-1px);
  }

  .page-about .timeline-item__summary {
    display: grid;
    grid-template-columns: 1fr 1fr;
    column-gap: 0;
    padding-left: 0;
    align-items: start;
  }

  .page-about .timeline-item:nth-child(odd) .timeline-item__summary {
    grid-template-areas: "year card";
  }

  .page-about .timeline-item:nth-child(even) .timeline-item__summary {
    grid-template-areas: "card year";
  }

  .page-about .timeline-item__year {
    grid-area: year;
    width: auto;
    padding: 12px 32px 0 0;
    text-align: right;
  }

  .page-about .timeline-item:nth-child(even) .timeline-item__year {
    padding: 12px 0 0 32px;
    text-align: left;
  }

  .page-about .timeline-item__year .data-mono {
    font-size: 44px;
  }

  .page-about .timeline-item__card {
    grid-area: card;
    margin-top: 0;
    padding: 20px 24px;
  }

  .page-about .timeline-item:nth-child(odd) .timeline-item__card {
    margin-left: 32px;
  }

  .page-about .timeline-item:nth-child(even) .timeline-item__card {
    margin-right: 32px;
  }

  .page-about .timeline-item__year::before {
    top: 28px;
  }

  .page-about .timeline-item:nth-child(odd) .timeline-item__year::before {
    left: auto;
    right: -8px;
  }

  .page-about .timeline-item:nth-child(even) .timeline-item__year::before {
    left: -8px;
    right: auto;
  }

  .page-about .timeline-item__expand {
    margin-left: calc(50% + 32px);
  }

  .page-about .timeline-item:nth-child(even) .timeline-item__expand {
    margin-right: calc(50% + 32px);
    margin-left: 0;
  }

  .page-about .about-archive__grid {
    grid-template-columns: 1.05fr 0.95fr;
    gap: 56px;
    align-items: center;
  }

  .page-about .about-archive__panels {
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
  }

  .page-about .about-culture__grid {
    grid-template-columns: 0.95fr 1.05fr;
    gap: 56px;
  }

  .page-about .about-future {
    padding-bottom: 96px;
  }

  .page-about .about-future__grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
  }

  .page-about .about-future__cta {
    gap: 18px;
  }
}