/* ===== 品牌文化页 · 技术蓝图纵向时间轴 ===== */
.page-about {
  --about-rail: 2px;
  --about-dot: 10px;
  --about-gap: clamp(28px, 4vw, 52px);
  padding-bottom: clamp(48px, 7vw, 96px);
}

/* 面包屑 */
.page-about .breadcrumbs {
  margin: 18px 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--paper);
}
.page-about .breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-about .breadcrumbs li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--blue);
}
.page-about .breadcrumbs a {
  color: var(--paper);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
  transition: color 180ms ease, border-color 180ms ease;
}
.page-about .breadcrumbs a:hover,
.page-about .breadcrumbs a:focus-visible {
  color: var(--lime);
  border-color: var(--lime);
}
.page-about .breadcrumbs [aria-current="page"] {
  color: var(--white);
}

/* 首屏 */
.page-about .about-hero {
  position: relative;
  padding-top: clamp(26px, 4vw, 46px);
}
.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 340px;
  pointer-events: none;
  z-index: 0;
  background-image:
    linear-gradient(to right, rgba(74, 215, 209, .055) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(74, 215, 209, .055) 1px, transparent 1px);
  background-size: 40px 40px;
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, .9), transparent);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, .9), transparent);
}
.page-about .about-hero > .container {
  position: relative;
  z-index: 1;
}
.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 3.5vw, 48px);
  align-items: center;
}
.page-about .eyebrow {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .18em;
  color: var(--blue);
}
.page-about .about-hero h1 {
  margin: 10px 0 16px;
  max-width: 18ch;
  font-size: clamp(30px, 5.2vw, 54px);
  line-height: 1.08;
  letter-spacing: -.025em;
  font-weight: 900;
  color: var(--white);
}
.page-about .about-hero__lede {
  margin: 0;
  max-width: 62ch;
  font-size: clamp(15px, 1.5vw, 16.5px);
  line-height: 1.85;
  color: var(--paper);
}
.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 3vw, 30px);
}
.page-about .about-hero__media {
  position: relative;
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  box-shadow: 10px 10px 0 rgba(74, 215, 209, .13);
}
.page-about .about-hero__media::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(74, 215, 209, .1) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(74, 215, 209, .1) 1px, transparent 1px);
  background-size: 36px 36px;
  mix-blend-mode: screen;
}
.page-about .about-hero__media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 900 / 620;
  object-fit: cover;
}

/* 首屏索引条 */
.page-about .about-index {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(34px, 4.5vw, 58px) 0 0;
  padding: 1px;
  list-style: none;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--line);
}
.page-about .about-index li {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 20px;
  background: var(--panel);
}
.page-about .about-index__no {
  font-family: var(--font-mono);
  font-size: clamp(26px, 3.6vw, 40px);
  font-weight: 700;
  line-height: 1;
  color: var(--lime);
}
.page-about .about-index__label {
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--paper);
}

/* 纵向时间轴容器 */
.page-about .about-flow-section {
  padding-top: clamp(40px, 6vw, 88px);
}
.page-about .about-flow {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: var(--about-gap);
  padding-left: 34px;
}
.page-about .about-flow::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 10px;
  bottom: 10px;
  width: var(--about-rail);
  border-radius: 2px;
  background: linear-gradient(180deg,
    rgba(182, 255, 59, .9) 0%,
    rgba(74, 215, 209, .65) 55%,
    rgba(42, 51, 47, .9) 100%);
}

/* 章节卡片 */
.page-about .about-chapter {
  position: relative;
  padding: clamp(20px, 3vw, 34px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  transition: transform 200ms ease, border-color 200ms ease;
}
.page-about .about-chapter:hover {
  transform: translateY(-2px);
  border-color: rgba(182, 255, 59, .35);
}
.page-about .about-chapter::before {
  content: "";
  position: absolute;
  top: 32px;
  left: -32px;
  width: var(--about-dot);
  height: var(--about-dot);
  border-radius: 50%;
  background: var(--lime);
  box-shadow: 0 0 0 4px rgba(182, 255, 59, .14);
}
.page-about .about-chapter .coord {
  display: inline-flex;
  align-items: center;
  padding: 3px 10px;
  border: 1px solid var(--line);
  border-radius: var(--radius-pill);
  background: rgba(74, 215, 209, .07);
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: .1em;
  color: var(--blue);
}
.page-about .about-chapter h2 {
  margin: 10px 0 12px;
  font-size: clamp(21px, 2.7vw, 30px);
  line-height: 1.2;
  letter-spacing: -.015em;
  color: var(--white);
}
.page-about .about-chapter p {
  margin: 0 0 14px;
  font-size: 14.5px;
  line-height: 1.82;
  color: var(--paper);
}
.page-about .about-chapter p:last-child {
  margin-bottom: 0;
}

/* 要点列表 */
.page-about .about-points {
  display: grid;
  gap: 10px;
  margin: 16px 0 0;
  padding: 0;
  list-style: none;
}
.page-about .about-points li {
  position: relative;
  padding-left: 20px;
  font-size: 14px;
  line-height: 1.72;
  color: var(--white);
}
.page-about .about-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .7em;
  width: 10px;
  height: 2px;
  background: var(--lime);
}

/* 比赛日时间轴 */
.page-about .about-chapter .timeline {
  display: grid;
  gap: 0;
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px dashed var(--line);
}
.page-about .about-chapter .timeline-item {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 4px;
  padding: 14px 0 14px 18px;
  border-bottom: 1px dashed var(--line);
}
.page-about .about-chapter .timeline-marker {
  position: absolute;
  left: 0;
  top: 19px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--blue);
}
.page-about .about-chapter .timeline-item--alert .timeline-marker {
  background: var(--orange);
  box-shadow: 0 0 0 3px rgba(255, 90, 31, .18);
}
.page-about .about-chapter .timeline-time {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--lime);
}
.page-about .about-chapter .timeline-item--alert .timeline-time {
  color: var(--orange);
}
.page-about .about-chapter .timeline-body {
  font-size: 14px;
  line-height: 1.72;
  color: var(--paper);
}

/* 章节内配图 */
.page-about .about-chapter__media {
  margin: 20px 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--ink);
}
.page-about .about-chapter__media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

/* 赛季分段切换 */
.page-about .about-seasons {
  margin-top: 22px;
}
.page-about .about-seasons .tab-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 18px;
}
.page-about .about-seasons .tab {
  padding: 7px 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius-pill);
  background: transparent;
  font-family: var(--font-sans);
  font-size: 13px;
  font-weight: 600;
  color: var(--paper);
  cursor: pointer;
  transition: color 180ms ease, border-color 180ms ease, background-color 180ms ease;
}
.page-about .about-seasons .tab:hover {
  color: var(--white);
  border-color: var(--paper);
}
.page-about .about-seasons .tab[aria-selected="true"] {
  color: var(--ink);
  background: var(--lime);
  border-color: var(--lime);
}
.page-about .about-seasons .tab:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 2px;
}
.page-about .about-seasons .tab-panel {
  padding: 18px 20px;
  border: 1px dashed var(--line);
  border-radius: 12px;
  background: rgba(74, 215, 209, .045);
}
.page-about .about-seasons .tab-panel[hidden] {
  display: none;
}
.page-about .about-season__lede {
  margin: 0 0 12px;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--white);
}
.page-about .about-seasons .about-points {
  margin-top: 0;
}

/* 服务指标 */
.page-about .about-metrics {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin: 20px 0;
  padding: 0;
  list-style: none;
}
.page-about .about-metrics li {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: linear-gradient(160deg, rgba(182, 255, 59, .09), rgba(20, 26, 24, .92) 70%);
}
.page-about .about-metrics__num {
  font-family: var(--font-mono);
  font-size: clamp(24px, 3vw, 32px);
  font-weight: 700;
  line-height: 1;
  color: var(--lime);
}
.page-about .about-metrics__unit {
  margin-left: 2px;
  font-size: 12px;
  color: var(--paper);
}
.page-about .about-metrics__label {
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--paper);
}

/* 章节内三向入口 */
.page-about .about-links {
  display: grid;
  gap: 10px;
  margin-top: 20px;
}
.page-about .about-link {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: rgba(11, 13, 12, .55);
  text-decoration: none;
  transition: transform 200ms ease, border-color 200ms ease, background-color 200ms ease;
}
.page-about .about-link:hover,
.page-about .about-link:focus-visible {
  transform: translateY(-2px);
  border-color: var(--lime);
  background: rgba(182, 255, 59, .07);
}
.page-about .about-link__title {
  font-size: 15px;
  font-weight: 700;
  color: var(--white);
}
.page-about .about-link__desc {
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--paper);
}

/* 结尾行动带 */
.page-about .about-cta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  margin-top: clamp(38px, 5vw, 72px);
  padding: clamp(24px, 3.5vw, 40px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background:
    linear-gradient(120deg, rgba(182, 255, 59, .13), rgba(11, 13, 12, 0) 48%),
    var(--panel);
}
.page-about .about-cta .cta-band__title {
  margin: 0;
  font-size: clamp(20px, 2.6vw, 28px);
  letter-spacing: -.015em;
  color: var(--white);
}
.page-about .about-cta .cta-band__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* 中等屏幕：时间轴行改为两列 */
@media (min-width: 560px) {
  .page-about .about-chapter .timeline-item {
    grid-template-columns: 108px minmax(0, 1fr);
    gap: 14px;
    align-items: baseline;
  }
  .page-about .about-links {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

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

@media (min-width: 760px) {
  .page-about .about-index {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* 桌面端：分屏首屏 + 左右错落章节 */
@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
  }
}

@media (min-width: 980px) {
  .page-about .about-flow {
    padding-left: 0;
  }
  .page-about .about-flow::before {
    left: 50%;
    margin-left: -1px;
  }
  .page-about .about-chapter {
    width: calc(50% - 48px);
  }
  .page-about .about-chapter:nth-child(odd) {
    margin-right: auto;
  }
  .page-about .about-chapter:nth-child(even) {
    margin-left: auto;
  }
  .page-about .about-chapter::before {
    left: auto;
    right: auto;
  }
  .page-about .about-chapter:nth-child(odd)::before {
    right: -53px;
  }
  .page-about .about-chapter:nth-child(even)::before {
    left: -53px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-chapter,
  .page-about .about-link,
  .page-about .about-seasons .tab {
    transition: none;
  }
  .page-about .about-chapter:hover,
  .page-about .about-link:hover,
  .page-about .about-link:focus-visible {
    transform: none;
  }
}