.page-about {
  --about-offset: 18px;
  --about-radius: 0px;
  background: var(--carbon);
  color: var(--ice);
  font-family: var(--font-body);
  max-width: 100%;
}

.page-about h1,
.page-about h2,
.page-about h3 {
  font-family: var(--font-display);
  font-weight: 900;
  letter-spacing: -0.015em;
}

.page-about a {
  color: var(--blue);
}

.page-about .mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

/* ============ 首屏 ============ */
.page-about .about-hero {
  position: relative;
  padding: 122px 0 54px;
  background:
    radial-gradient(120% 95% at 88% -12%, rgba(225, 6, 0, 0.3) 0%, rgba(225, 6, 0, 0) 58%),
    linear-gradient(166deg, var(--carbon) 0%, var(--carbon-2) 58%, var(--carbon) 100%);
  border-bottom: 1px solid var(--line);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -24%;
  right: -12%;
  width: 64%;
  height: 148%;
  background-image: repeating-linear-gradient(112deg, rgba(244, 246, 248, 0.055) 0 1px, transparent 1px 13px);
  transform: skewX(-8deg);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--red) 0%, var(--red) 22%, var(--red-dark) 22%, var(--red-dark) 30%, transparent 30%);
}

.page-about .about-hero__grid {
  position: relative;
  display: grid;
  gap: 30px;
  margin-top: 24px;
}

.page-about .about-hero__lead {
  position: relative;
}

.page-about .about-hero h1 {
  margin: 14px 0 20px;
  font-size: clamp(32px, 7.2vw, 72px);
  line-height: 1.04;
  max-width: 16ch;
}

.page-about .about-hero h1 .hl {
  color: var(--red);
  display: inline-block;
}

.page-about .about-hero__text {
  margin: 0;
  max-width: 60ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--fog);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .about-hero__facts {
  display: grid;
  gap: 12px;
  align-content: start;
}

.page-about .fact-card {
  position: relative;
  padding: 16px 18px 18px;
  background: rgba(38, 38, 43, 0.84);
  border: 1px solid var(--line);
  border-left: 3px solid var(--red);
  box-shadow: var(--shadow-panel);
}

.page-about .fact-card__num {
  display: block;
  font-size: 34px;
  font-weight: 700;
  line-height: 1;
  color: var(--ice);
}

.page-about .fact-card__label {
  display: block;
  margin-top: 8px;
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--lime);
}

.page-about .fact-card__desc {
  margin: 8px 0 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--fog);
}

/* ============ 双栏：赛季索引轴 + 内容流 ============ */
.page-about .about-layout {
  display: grid;
  gap: 26px;
  padding-top: 44px;
  padding-bottom: 68px;
}

.page-about .season-rail {
  min-width: 0;
}

.page-about .season-rail__title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--fog);
}

.page-about .season-rail__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 2px 2px 10px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .rail-link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-bottom: 2px solid var(--line-strong);
  color: var(--fog);
  font-size: 13.5px;
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.24s var(--ease), border-color 0.24s var(--ease), background 0.24s var(--ease);
}

.page-about .rail-link:hover,
.page-about .rail-link:focus-visible {
  color: var(--ice);
  border-color: var(--line-strong);
  border-bottom-color: var(--red);
  background: rgba(244, 246, 248, 0.05);
}

.page-about .rail-num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--red);
}

.page-about .about-stream {
  display: grid;
  gap: 24px;
  min-width: 0;
}

/* ============ 章节面板 ============ */
.page-about .about-block {
  position: relative;
  min-width: 0;
}

.page-about .about-block__inner {
  position: relative;
  padding: 26px 20px 30px;
  background: var(--carbon-2);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-panel);
  overflow: hidden;
}

.page-about .about-block__inner::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 3px;
  height: 100%;
  background: var(--red);
}

.page-about .about-block--blue .about-block__inner::before {
  background: var(--blue);
}

.page-about .about-block--lime .about-block__inner::before {
  background: var(--lime);
}

.page-about .block-anno {
  display: none;
}

.page-about .block-head {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 14px;
  align-items: start;
  margin-bottom: 20px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--line);
}

.page-about .block-head__num {
  display: block;
  padding-top: 5px;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--red);
}

.page-about .block-head h2 {
  margin: 0;
  font-size: clamp(23px, 4.4vw, 34px);
  line-height: 1.2;
}

.page-about .block-lead {
  margin: 12px 0 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--fog);
}

.page-about .prose p {
  margin: 0 0 14px;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--fog);
}

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

.page-about .prose a {
  color: var(--blue);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 163, 255, 0.45);
}

.page-about .prose a:hover {
  border-bottom-color: var(--blue);
}

/* ============ 折线图 ============ */
.page-about .season-chart {
  margin: 22px 0 0;
  padding: 16px 8px 10px;
  background: rgba(18, 18, 18, 0.62);
  border: 1px solid var(--line);
}

.page-about .season-chart svg {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .season-chart figcaption {
  margin-top: 8px;
  padding: 0 6px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--fog);
}

.page-about .chart-grid line {
  stroke: rgba(244, 246, 248, 0.12);
  stroke-width: 1;
}

.page-about .chart-area {
  fill: rgba(225, 6, 0, 0.14);
}

.page-about .chart-line {
  fill: none;
  stroke: var(--red);
  stroke-width: 3;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.page-about .chart-dots circle {
  fill: var(--blue);
  stroke: var(--carbon);
  stroke-width: 2;
}

.page-about .chart-ticks text {
  font-family: var(--font-mono);
  font-size: 11px;
  fill: var(--fog);
}

.page-about .chart-value {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  fill: var(--lime);
}

/* ============ 图片 ============ */
.page-about .block-media {
  margin: 20px 0 0;
}

.page-about .media-frame {
  border: 1px solid var(--line);
  background: var(--panel);
}

.page-about .media-frame img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

/* ============ 团队四面板 ============ */
.page-about .team-grid {
  display: grid;
  gap: 16px;
  margin-top: 22px;
}

.page-about .team-card {
  position: relative;
  padding: 22px 16px 24px;
  background: var(--panel);
  border: 1px solid var(--line);
  transition: transform 0.28s var(--ease), border-color 0.28s var(--ease), background 0.28s var(--ease);
}

.page-about .team-card::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 38px;
  height: 3px;
  background: var(--red);
}

.page-about .team-card:hover,
.page-about .team-card:focus-within {
  transform: translateY(-4px);
  border-color: var(--red);
  background: #2C2C32;
}

.page-about .team-card__num {
  display: block;
  font-size: 38px;
  font-weight: 700;
  line-height: 1;
  color: var(--ice);
}

.page-about .team-card__role {
  margin: 10px 0 10px;
  font-size: 18px;
  line-height: 1.3;
}

.page-about .team-card__desc {
  margin: 0;
  font-size: 13.8px;
  line-height: 1.76;
  color: var(--fog);
}

/* ============ 项目列表 ============ */
.page-about .disc-list {
  display: grid;
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .disc-list > li {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 12px;
  padding: 15px 0;
  border-top: 1px solid var(--line);
}

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

.page-about .disc-list__idx {
  padding-top: 3px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--red);
}

.page-about .disc-list h3 {
  margin: 0 0 6px;
  font-size: 16.5px;
  line-height: 1.4;
}

.page-about .disc-list p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--fog);
}

/* ============ 数据四步 ============ */
.page-about .flow-steps {
  display: grid;
  gap: 10px;
  margin-top: 20px;
}

.page-about .flow-step {
  background: var(--panel);
  border: 1px solid var(--line);
}

.page-about .flow-step[data-open="true"] {
  border-color: var(--line-strong);
  border-left: 3px solid var(--red);
}

.page-about .flow-step__trigger {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr) 22px;
  align-items: center;
  gap: 12px;
  width: 100%;
  padding: 14px 16px;
  background: none;
  border: 0;
  color: inherit;
  font: inherit;
  text-align: left;
  cursor: pointer;
}

.page-about .flow-step__num {
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--red);
}

.page-about .flow-step__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 17px;
  letter-spacing: 0.02em;
  color: var(--ice);
}

.page-about .flow-step__sign {
  justify-self: end;
  font-family: var(--font-mono);
  font-size: 19px;
  line-height: 1;
  color: var(--blue);
  transition: transform 0.3s var(--ease), color 0.3s var(--ease);
}

.page-about .flow-step[data-open="true"] .flow-step__sign {
  transform: rotate(45deg);
  color: var(--red);
}

.page-about .flow-step__panel {
  padding: 0 18px 18px 62px;
}

.page-about .flow-step__panel p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--fog);
}

.page-about .flow-step[data-open="false"] .flow-step__panel {
  display: none;
}

/* ============ 数字行 ============ */
.page-about .stat-row {
  display: grid;
  gap: 12px;
  margin: 22px 0 0;
}

.page-about .stat-cell {
  padding: 16px 16px 18px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-top: 3px solid var(--red);
}

.page-about .stat-cell__num {
  display: block;
  font-size: 30px;
  font-weight: 700;
  line-height: 1;
  color: var(--ice);
}

.page-about .stat-cell__label {
  display: block;
  margin-top: 9px;
  font-size: 12.5px;
  letter-spacing: 0.08em;
  color: var(--fog);
}

/* ============ 结尾 ============ */
.page-about .about-cta {
  position: relative;
  padding: 62px 0 76px;
  background: linear-gradient(180deg, var(--carbon) 0%, #1A0200 100%);
  border-top: 1px solid var(--line);
  overflow: hidden;
}

.page-about .about-cta::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 7px;
  background-image: repeating-linear-gradient(100deg, var(--red) 0 30px, var(--red-dark) 30px 60px);
  transform: skewY(-1.4deg);
  transform-origin: left center;
}

.page-about .about-cta__inner {
  max-width: 62ch;
}

.page-about .about-cta h2 {
  margin: 0 0 14px;
  font-size: clamp(24px, 5vw, 40px);
  line-height: 1.15;
}

.page-about .about-cta p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--fog);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

/* ============ 响应式 ============ */
@media (min-width: 640px) {
  .page-about .about-block__inner {
    padding: 30px 30px 34px;
  }

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

  .page-about .block-head {
    grid-template-columns: 52px minmax(0, 1fr);
  }
}

@media (min-width: 720px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

  .page-about .team-card:nth-child(2) {
    margin-top: 20px;
  }

  .page-about .team-card:nth-child(4) {
    margin-top: 32px;
  }
}

@media (min-width: 960px) {
  .page-about .about-hero {
    padding: 138px 0 66px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 40px;
    align-items: end;
  }

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

  .page-about .fact-card:nth-child(2) {
    margin-left: 14px;
  }

  .page-about .fact-card:nth-child(3) {
    margin-left: 28px;
  }
}

@media (min-width: 1024px) {
  .page-about .about-layout {
    grid-template-columns: 216px minmax(0, 1fr);
    gap: 44px;
    align-items: start;
  }

  .page-about .season-rail {
    position: sticky;
    top: 96px;
  }

  .page-about .season-rail__list {
    display: block;
    padding: 0;
    overflow: visible;
  }

  .page-about .season-rail__list > li + li {
    margin-top: 4px;
  }

  .page-about .rail-link {
    border: 0;
    border-left: 2px solid var(--line-strong);
    padding: 11px 12px;
  }

  .page-about .rail-link:hover,
  .page-about .rail-link:focus-visible {
    border-left-color: var(--red);
    background: rgba(244, 246, 248, 0.05);
  }

  .page-about .about-block:nth-child(even) .about-block__inner {
    margin-left: var(--about-offset);
  }

  .page-about .block-anno {
    display: block;
    position: absolute;
    top: 34px;
    right: 12px;
    writing-mode: vertical-rl;
    font-family: var(--font-mono);
    font-size: 10px;
    letter-spacing: 0.24em;
    text-transform: uppercase;
    color: var(--fog);
    opacity: 0.6;
  }
}

@media (min-width: 1100px) {
  .page-about .team-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .team-card:nth-child(2) {
    margin-top: 18px;
  }

  .page-about .team-card:nth-child(3) {
    margin-top: 6px;
  }

  .page-about .team-card:nth-child(4) {
    margin-top: 30px;
  }
}

@media (max-width: 1023px) {
  .page-about .about-block__inner::before {
    width: 100%;
    height: 3px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .team-card,
  .page-about .rail-link,
  .page-about .flow-step__sign {
    transition: none;
  }

  .page-about .team-card:hover,
  .page-about .team-card:focus-within {
    transform: none;
  }
}