.page-about {
  --about-rail-w: 208px;
  --about-gap: clamp(20px, 3vw, 46px);
  --about-line: rgba(43, 224, 200, 0.20);
  background: var(--ink);
  color: var(--text);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(92px, 13vh, 148px) 0 clamp(28px, 4vw, 48px);
  border-bottom: 1px solid var(--line-soft);
  background:
    radial-gradient(112% 84% at 6% -12%, rgba(43, 224, 200, 0.13), transparent 62%),
    linear-gradient(180deg, rgba(20, 51, 43, 0.72) 0%, rgba(11, 31, 26, 0) 82%);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0.34;
  background-image: linear-gradient(90deg, var(--line-soft) 1px, transparent 1px);
  background-size: 25% 100%;
}

.page-about .about-hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(26px, 3.6vw, 52px);
}

.page-about .about-hero-main .breadcrumb {
  margin-bottom: clamp(16px, 2.4vw, 26px);
  font-size: 13px;
}

.page-about .about-eyebrow {
  margin: 0;
  font-size: 11.5px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--amber);
}

.page-about .about-hero h1 {
  margin: 14px 0 0;
  max-width: 18ch;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(30px, 6.2vw, 62px);
  line-height: 1.06;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-about .about-lede {
  margin: clamp(16px, 2.2vw, 24px) 0 0;
  max-width: 40em;
  font-size: 15px;
  line-height: 1.85;
  letter-spacing: 0.01em;
  color: var(--text-soft);
}

.page-about .about-hero-stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

.page-about .about-hero-stats li {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: 14px 15px 16px;
  background: rgba(16, 19, 21, 0.74);
}

.page-about .about-hero-num {
  font-family: var(--font-mono);
  font-size: clamp(24px, 4.4vw, 38px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--cyan);
}

.page-about .about-hero-stats li:nth-child(even) .about-hero-num {
  color: var(--amber);
}

.page-about .about-hero-cap {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--muted);
}

/* ---------- 主体栅格 ---------- */
.page-about .about-body {
  padding: clamp(30px, 5vw, 66px) 0 clamp(52px, 7vw, 100px);
}

.page-about .about-body-grid {
  display: grid;
  gap: var(--about-gap);
}

.page-about .about-columns {
  min-width: 0;
}

/* ---------- 章节索引 ---------- */
.page-about .about-rail {
  align-self: start;
  min-width: 0;
}

.page-about .about-rail-label {
  margin: 0 0 12px;
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-about .about-toc {
  list-style: none;
  margin: 0;
  padding: 0 0 4px;
  display: flex;
  gap: 6px;
  overflow-x: auto;
  border-left: 0;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}

.page-about .about-toc li {
  flex: none;
}

.page-about .about-toc a {
  display: block;
  white-space: nowrap;
  padding: 7px 11px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.4;
  color: var(--muted);
  text-decoration: none;
  border: 1px solid var(--line-soft);
  background: rgba(16, 19, 21, 0.7);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease),
    background var(--dur) var(--ease);
}

.page-about .about-toc a:hover,
.page-about .about-toc a:focus-visible,
.page-about .about-toc a[aria-current="true"] {
  color: var(--cyan);
  border-color: rgba(43, 224, 200, 0.55);
  background: rgba(20, 51, 43, 0.78);
  outline: none;
}

/* ---------- 章节通用 ---------- */
.page-about .about-sec {
  padding: clamp(24px, 3.6vw, 44px) 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-sec:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .about-sec-head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: clamp(14px, 2vw, 22px);
}

.page-about .about-sec-num {
  flex: none;
  padding: 2px 7px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--amber);
  border: 1px solid rgba(240, 178, 60, 0.45);
  transform: translateY(-3px);
}

.page-about .about-sec-title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(21px, 3vw, 31px);
  line-height: 1.24;
  color: var(--text);
}

.page-about .about-sec-body > p {
  margin: 0 0 14px;
  max-width: 42em;
  font-size: 15px;
  line-height: 1.85;
  letter-spacing: 0.01em;
  color: var(--text-soft);
}

.page-about .about-sec-body > p:last-child {
  margin-bottom: 0;
}

.page-about .about-sec-body > p strong {
  color: var(--text);
  font-weight: 700;
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 0 0 clamp(18px, 2.6vw, 30px);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--line-soft);
  filter: saturate(0.84) contrast(1.06);
}

.page-about .about-figure figcaption {
  margin-top: 9px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--muted);
}

.page-about .about-figure--narrow img {
  max-height: 340px;
}

/* ---------- 团队比例条 ---------- */
.page-about .about-bars {
  margin: 6px 0 0;
  border: 1px solid var(--line-soft);
  background: rgba(16, 19, 21, 0.58);
}

.page-about .about-bar {
  display: grid;
  grid-template-columns: minmax(84px, 118px) minmax(0, 1fr) auto;
  align-items: center;
  gap: 12px;
  padding: 13px 14px;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-bar:last-child {
  border-bottom: 0;
}

.page-about .about-bar-role {
  font-size: 13px;
  font-weight: 600;
  color: var(--text);
}

.page-about .about-bar-track {
  position: relative;
  display: block;
  height: 8px;
  background: rgba(154, 166, 162, 0.14);
  overflow: hidden;
}

.page-about .about-bar-fill {
  display: block;
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--cyan), var(--away));
}

.page-about .about-bar--collect .about-bar-fill {
  width: 60%;
}

.page-about .about-bar--product .about-bar-fill {
  width: 28%;
  background: linear-gradient(90deg, var(--amber), rgba(240, 178, 60, 0.35));
}

.page-about .about-bar--editor .about-bar-fill {
  width: 12%;
  background: linear-gradient(90deg, var(--muted), rgba(154, 166, 162, 0.3));
}

.page-about .about-bar-num {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--cyan);
  white-space: nowrap;
}

.page-about .about-role-notes {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-role-notes li {
  padding: 0 0 0 14px;
  border-left: 2px solid rgba(43, 224, 200, 0.28);
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-role-notes strong {
  display: block;
  margin-bottom: 3px;
  font-size: 14px;
  font-weight: 700;
  color: var(--text);
}

/* ---------- 数据旅程流程带 ---------- */
.page-about .about-flow {
  list-style: none;
  margin: 8px 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

.page-about .about-step {
  position: relative;
  padding: 18px 16px 20px;
  background: rgba(16, 19, 21, 0.84);
  transition: background var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .about-step::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--cyan), rgba(43, 224, 200, 0));
  opacity: 0.5;
  transition: opacity var(--dur) var(--ease);
}

.page-about .about-step:hover,
.page-about .about-step:focus-within {
  background: rgba(20, 51, 43, 0.9);
  transform: translateY(-2px);
}

.page-about .about-step:hover::before {
  opacity: 1;
}

.page-about .about-step-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--amber);
}

.page-about .about-step-time {
  margin: 9px 0 0;
  font-family: var(--font-mono);
  font-size: clamp(19px, 2.4vw, 25px);
  line-height: 1.1;
  letter-spacing: -0.01em;
  color: var(--cyan);
}

.page-about .about-step-title {
  margin: 10px 0 0;
  font-size: 15px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--text);
}

.page-about .about-step .about-step-note {
  margin: 9px 0 0;
  font-size: 13px;
  line-height: 1.75;
  color: var(--muted);
  opacity: 0.78;
  transition: opacity var(--dur) var(--ease);
}

.page-about .about-step:hover .about-step-note,
.page-about .about-step:focus-within .about-step-note {
  opacity: 1;
}

/* ---------- 版本时间轴 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: 8px 0 0;
  padding: 0 0 0 22px;
  border-left: 1px solid var(--about-line);
}

.page-about .about-ver {
  position: relative;
  padding: 0 0 24px;
}

.page-about .about-ver:last-child {
  padding-bottom: 4px;
}

.page-about .about-ver::before {
  content: "";
  position: absolute;
  top: 7px;
  left: -22px;
  width: 9px;
  height: 9px;
  background: var(--ink);
  border: 1px solid var(--cyan);
  transform: translateX(-50%) rotate(45deg);
  transition: background var(--dur) var(--ease);
}

.page-about .about-ver:hover::before {
  background: var(--cyan);
}

.page-about .about-ver-head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
}

.page-about .about-ver-no {
  padding: 3px 9px;
  font-family: var(--font-mono);
  font-size: 13.5px;
  letter-spacing: 0.04em;
  color: var(--cyan);
  border: 1px solid rgba(43, 224, 200, 0.4);
  background: rgba(43, 224, 200, 0.06);
}

.page-about .about-ver-tag {
  padding: 3px 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--amber);
  border: 1px solid rgba(240, 178, 60, 0.4);
}

.page-about .about-ver .about-ver-text {
  margin: 11px 0 0;
  max-width: 40em;
  font-size: 14px;
  line-height: 1.82;
  color: var(--text-soft);
}

.page-about .about-figure--narrow {
  margin-top: clamp(20px, 3vw, 32px);
  margin-bottom: 0;
}

/* ---------- 赛事覆盖 ---------- */
.page-about .about-coverage {
  position: relative;
  margin: 8px 0 0;
  border: 1px solid var(--line-soft);
  background: var(--ink);
  overflow: hidden;
}

.page-about .about-coverage-img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.22;
  filter: grayscale(1) contrast(1.16);
}

.page-about .about-coverage-body {
  position: relative;
  z-index: 1;
  padding: clamp(20px, 3vw, 34px);
  background: linear-gradient(180deg, rgba(11, 31, 26, 0.74), rgba(11, 31, 26, 0.97));
}

.page-about .about-coverage-body > p {
  margin: 0;
  max-width: 42em;
  font-size: 15px;
  line-height: 1.85;
  letter-spacing: 0.01em;
  color: var(--text-soft);
}

.page-about .about-facts {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

.page-about .about-facts li {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: 15px 14px 17px;
  background: rgba(16, 19, 21, 0.86);
}

.page-about .about-fact-num {
  font-family: var(--font-mono);
  font-size: clamp(22px, 3vw, 30px);
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--pos);
}

.page-about .about-facts li:nth-child(even) .about-fact-num {
  color: var(--amber);
}

.page-about .about-fact-label {
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--muted);
}

/* ---------- 合作 ---------- */
.page-about .about-partners {
  display: grid;
  gap: 1px;
  margin-top: 18px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

.page-about .about-partner {
  padding: 20px 18px 22px;
  background: rgba(16, 19, 21, 0.84);
  transition: background var(--dur) var(--ease);
}

.page-about .about-partner:hover {
  background: rgba(20, 51, 43, 0.85);
}

.page-about .about-partner-num {
  font-family: var(--font-mono);
  font-size: clamp(24px, 3.4vw, 34px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--cyan);
}

.page-about .about-partner h3 {
  margin: 10px 0 8px;
  font-size: 15.5px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--text);
}

.page-about .about-partner p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 下一步 ---------- */
.page-about .about-next {
  margin-top: clamp(30px, 4vw, 58px);
  padding-top: clamp(24px, 3vw, 40px);
  border-top: 1px solid var(--line-soft);
}

.page-about .about-next-title {
  margin: 0 0 clamp(14px, 2vw, 20px);
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(19px, 2.6vw, 26px);
  line-height: 1.3;
  color: var(--text);
}

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

.page-about .about-next-card {
  display: block;
  padding: 20px 18px 22px;
  background: rgba(16, 19, 21, 0.86);
  text-decoration: none;
  color: inherit;
  transition: background var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .about-next-card:hover,
.page-about .about-next-card:focus-visible {
  background: var(--pine);
  transform: translateY(-2px);
  outline: none;
}

.page-about .about-next-card h3 {
  margin: 0 0 9px;
  font-size: 16px;
  font-weight: 700;
  color: var(--text);
}

.page-about .about-next-card p {
  margin: 0;
  font-size: 13px;
  line-height: 1.78;
  color: var(--muted);
}

.page-about .about-next-more {
  display: inline-block;
  margin-top: 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--cyan);
}

.page-about .about-next-card:hover .about-next-more {
  color: var(--amber);
}

.page-about .about-next-back {
  margin: 18px 0 0;
  font-size: 13px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-next-back a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(43, 224, 200, 0.4);
}

.page-about .about-next-back a:hover {
  color: var(--amber);
  border-bottom-color: rgba(240, 178, 60, 0.6);
}

/* ---------- 入场动效 ---------- */
@media (prefers-reduced-motion: no-preference) {
  .page-about [data-reveal] {
    opacity: 0;
    transform: translateY(12px);
    transition: opacity 0.55s var(--ease), transform 0.55s var(--ease);
    animation: about-fallback-in 0.5s var(--ease) 1.8s forwards;
  }

  .page-about [data-reveal].is-in {
    opacity: 1;
    transform: none;
    animation: none;
  }
}

@keyframes about-fallback-in {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
    animation: none;
  }
}

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-about .about-facts {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-role-notes {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px 22px;
  }
}

@media (min-width: 760px) {
  .page-about .about-flow {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (min-width: 920px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.28fr) minmax(280px, 0.72fr);
    align-items: end;
  }

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

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

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

@media (min-width: 1000px) {
  .page-about .about-body-grid {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: clamp(28px, 4vw, 68px);
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--header-h) + 22px);
  }

  .page-about .about-rail-label {
    margin-bottom: 14px;
  }

  .page-about .about-toc {
    display: block;
    overflow: visible;
    border-left: 1px solid var(--line-soft);
    padding-bottom: 0;
  }

  .page-about .about-toc a {
    padding: 9px 0 9px 15px;
    border: 0;
    background: none;
    border-left: 2px solid transparent;
    margin-left: -1px;
  }

  .page-about .about-toc a:hover,
  .page-about .about-toc a:focus-visible,
  .page-about .about-toc a[aria-current="true"] {
    background: none;
    border-left-color: var(--cyan);
  }

  .page-about .about-figure--narrow img {
    max-height: 300px;
  }
}

@media (min-width: 1200px) {
  .page-about .about-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (max-width: 480px) {
  .page-about .about-bar {
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 6px 10px;
  }

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

  .page-about .about-hero h1 {
    max-width: none;
  }
}