.page-about {
  --about-rule: rgba(237, 227, 204, 0.14);
  --about-amber-glow: rgba(242, 193, 78, 0.14);
  --about-cyan-soft: rgba(37, 240, 210, 0.42);
}

/* ---------- 刊头 ---------- */
.page-about .about-masthead {
  position: relative;
  overflow: hidden;
  padding: clamp(28px, 5.5vw, 68px) 0 clamp(24px, 4vw, 46px);
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(115% 92% at 88% 0%, rgba(37, 240, 210, 0.10), transparent 58%),
    linear-gradient(180deg, var(--panel) 0%, var(--ink) 82%);
}

.page-about .about-masthead::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(37, 240, 210, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(37, 240, 210, 0.05) 1px, transparent 1px);
  background-size: 64px 64px;
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.75), transparent 72%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.75), transparent 72%);
}

.page-about .about-masthead > .shell {
  position: relative;
  z-index: 1;
}

.page-about .crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0 0 clamp(18px, 3vw, 30px);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.page-about .crumbs a {
  color: var(--muted);
  text-decoration: none;
  transition: color var(--t-fast) var(--ease);
}

.page-about .crumbs a:hover,
.page-about .crumbs a:focus-visible {
  color: var(--cyan);
}

.page-about .about-masthead__title {
  max-width: 20ch;
  margin: 14px 0 0;
}

.page-about .about-masthead__lead {
  max-width: 56ch;
  margin: 18px 0 0;
  color: var(--paper);
  opacity: 0.86;
}

.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: clamp(26px, 4.5vw, 46px);
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-facts__cell {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 18px 18px;
  background: var(--ink);
}

.page-about .about-facts .num {
  color: var(--cyan);
}

.page-about .num__unit {
  margin-left: 0.18em;
  font-size: 0.44em;
  color: var(--muted);
}

.page-about .about-facts .label {
  color: var(--muted);
}

/* ---------- 正文分屏 ---------- */
.page-about .about-body {
  padding-top: clamp(30px, 5vw, 58px);
  padding-bottom: clamp(44px, 7vw, 96px);
}

.page-about .about-split {
  display: grid;
  gap: clamp(24px, 4vw, 40px);
}

.page-about .about-split .split__aside,
.page-about .about-split .split__main,
.page-about .team__main {
  min-width: 0;
}

@media (min-width: 960px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 3fr) minmax(0, 9fr);
    gap: clamp(30px, 4.5vw, 64px);
    align-items: start;
  }
}

/* ---------- 左侧索引 ---------- */
.page-about .about-rail {
  position: sticky;
  top: 92px;
}

.page-about .about-rail__title {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-about .about-rail__list {
  display: flex;
  flex-direction: column;
  gap: 2px;
  border-left: 1px solid var(--line);
}

.page-about .about-rail .rail__link {
  position: relative;
  display: block;
  padding: 9px 12px 9px 18px;
  font-size: 14.5px;
  line-height: 1.5;
  color: var(--muted);
  text-decoration: none;
  transition: color var(--t) var(--ease), background var(--t) var(--ease);
}

.page-about .about-rail .rail__link::before {
  content: "";
  position: absolute;
  left: -4px;
  top: 50%;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  transform: translateY(-50%);
  background: var(--line);
  transition: background var(--t) var(--ease), box-shadow var(--t) var(--ease);
}

.page-about .about-rail .rail__link:hover,
.page-about .about-rail .rail__link:focus-visible {
  color: var(--paper);
}

.page-about .about-rail .rail__link.is-active {
  color: var(--paper);
  background: rgba(37, 240, 210, 0.05);
}

.page-about .about-rail .rail__link.is-active::before {
  background: var(--amber);
  box-shadow: 0 0 0 4px var(--about-amber-glow);
}

.page-about .about-rail .rail__link:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: 2px;
}

/* ---------- 章节 ---------- */
.page-about .about-section {
  padding: clamp(28px, 4.5vw, 52px) 0;
  border-top: 1px solid var(--about-rule);
}

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

.page-about .about-section__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: clamp(14px, 2.4vw, 22px);
}

.page-about .about-section__index {
  flex: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--amber);
}

.page-about .about-section__head .h2 {
  margin: 0;
}

.page-about .about-section__lead {
  max-width: 62ch;
  margin: 0 0 clamp(16px, 2.6vw, 24px);
  color: var(--muted);
  font-size: 16px;
  line-height: 1.8;
}

.page-about .about-section__note {
  margin: clamp(14px, 2.4vw, 20px) 0 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .about-section__note a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(37, 240, 210, 0.35);
  transition: color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease);
}

.page-about .about-section__note a:hover,
.page-about .about-section__note a:focus-visible {
  color: var(--paper);
  border-color: var(--amber);
}

/* ---------- 场景三栏 ---------- */
.page-about .scene {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .scene__item {
  display: grid;
  gap: 7px;
  padding: 18px;
  background: var(--panel);
}

.page-about .scene__label {
  margin: 0;
  font-family: var(--font-head);
  font-size: 19px;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--paper);
}

.page-about .scene__text {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--muted);
}

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

/* ---------- 流程 ---------- */
.page-about .flow-visual {
  margin: 0 0 clamp(20px, 3vw, 30px);
  border: 1px solid var(--line);
  background: var(--panel);
  overflow: hidden;
}

.page-about .flow-visual img {
  display: block;
  width: 100%;
  height: clamp(160px, 24vw, 280px);
  object-fit: cover;
  opacity: 0.62;
}

.page-about .flow {
  list-style: none;
  margin: 0;
  padding: 0;
  counter-reset: flow;
}

.page-about .flow__step {
  position: relative;
  counter-increment: flow;
  padding: 18px 0 20px clamp(46px, 6vw, 60px);
  border-top: 1px solid var(--line);
}

.page-about .flow__step:last-child {
  border-bottom: 1px solid var(--line);
}

.page-about .flow__step::before {
  content: counter(flow, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 18px;
  font-family: var(--font-mono);
  font-size: 20px;
  line-height: 1;
  color: var(--cyan);
}

.page-about .flow__step:not(:last-child)::after {
  content: "";
  position: absolute;
  left: 11px;
  top: 46px;
  bottom: -1px;
  width: 1px;
  background: linear-gradient(180deg, var(--about-cyan-soft), rgba(37, 240, 210, 0.06));
}

.page-about .flow__title {
  margin: 0 0 7px;
  font-family: var(--font-head);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--paper);
  transition: color var(--t-fast) var(--ease);
}

.page-about .flow__step:hover .flow__title {
  color: var(--cyan);
}

.page-about .flow__text {
  max-width: 60ch;
  margin: 0;
  font-size: 16px;
  line-height: 1.78;
  color: var(--paper);
  opacity: 0.82;
}

.page-about .flow__note {
  max-width: 58ch;
  margin: 9px 0 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 团队 ---------- */
.page-about .team {
  display: grid;
  gap: clamp(22px, 3.5vw, 34px);
}

@media (min-width: 900px) {
  .page-about .team {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    align-items: start;
  }
}

.page-about .team__side {
  margin: 0;
}

.page-about .team__side img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: clamp(220px, 30vw, 340px);
  object-fit: cover;
}

.page-about .team-bars {
  display: grid;
  gap: 18px;
  margin-top: clamp(16px, 2.5vw, 24px);
}

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

.page-about .team-bar__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
}

.page-about .team-bar__name {
  font-family: var(--font-head);
  font-size: 18px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .team-bar__count {
  color: var(--cyan);
}

.page-about .team-bar__track {
  height: 10px;
  background: var(--ink);
  border: 1px solid var(--line);
  overflow: hidden;
}

.page-about .team-bar__fill {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, var(--cyan), rgba(37, 240, 210, 0.26));
  transition: background var(--t-slow) var(--ease), box-shadow var(--t-slow) var(--ease);
}

.page-about .team-bar:hover .team-bar__fill {
  background: linear-gradient(90deg, var(--amber), rgba(242, 193, 78, 0.25));
  box-shadow: inset 0 0 0 1px rgba(242, 193, 78, 0.5);
}

.page-about .team-bar__note {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 赛事覆盖 ---------- */
.page-about .coverage-banner {
  margin: 0 0 clamp(18px, 3vw, 26px);
  border: 1px solid var(--line);
  overflow: hidden;
}

.page-about .coverage-banner img {
  display: block;
  width: 100%;
  height: clamp(150px, 22vw, 240px);
  object-fit: cover;
  opacity: 0.55;
}

.page-about .lanes {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .lanes__item {
  display: grid;
  gap: 5px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}

@media (min-width: 700px) {
  .page-about .lanes__item {
    grid-template-columns: 150px minmax(0, 1fr);
    align-items: baseline;
    gap: 20px;
  }
}

.page-about .lanes__name {
  font-family: var(--font-head);
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--amber);
}

.page-about .lanes__desc {
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--muted);
}

/* ---------- 版本演进 ---------- */
.page-about .about-version {
  list-style: none;
  margin: 0;
  padding: 4px 0 0;
}

.page-about .about-version__item {
  position: relative;
  padding: 0 0 22px 30px;
}

.page-about .about-version__item::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 8px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--amber);
  box-shadow: 0 0 0 4px var(--about-amber-glow);
}

.page-about .about-version__item:not(:last-child)::after {
  content: "";
  position: absolute;
  left: 6px;
  top: 24px;
  bottom: 0;
  width: 1px;
  background: var(--line);
}

.page-about .about-version__tag {
  display: inline-block;
  margin-bottom: 9px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
}

.page-about .about-version__text {
  max-width: 56ch;
  margin: 0;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--muted);
}

/* ---------- 更新节奏 ---------- */
.page-about .cadence {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .cadence__cell {
  display: grid;
  gap: 8px;
  align-content: start;
  padding: 20px 20px 22px;
  background: var(--ink);
}

.page-about .cadence__cell .num {
  color: var(--cyan);
}

.page-about .cadence__title {
  margin: 0;
  font-family: var(--font-head);
  font-size: 19px;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--paper);
}

.page-about .cadence__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted);
}

@media (min-width: 760px) {
  .page-about .cadence {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 行动区与注释带 ---------- */
.page-about .about-cta {
  display: grid;
  gap: 20px;
  margin-top: clamp(32px, 5vw, 56px);
  padding: clamp(22px, 3.6vw, 38px);
  border: 1px solid var(--line);
  background: linear-gradient(110deg, var(--panel) 0%, var(--violet) 100%);
}

@media (min-width: 860px) {
  .page-about .about-cta {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    align-items: center;
  }
}

.page-about .about-cta__body .h3 {
  margin: 0 0 10px;
}

.page-about .about-cta__body p {
  max-width: 46ch;
  margin: 0;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--muted);
}

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

.page-about .about-footnote {
  margin-top: clamp(26px, 4vw, 42px);
}

/* ---------- 窄屏 ---------- */
@media (max-width: 959px) {
  .page-about .about-rail {
    position: static;
  }

  .page-about .about-rail__list {
    flex-direction: row;
    gap: 8px;
    padding: 12px 0 4px;
    border-left: 0;
    border-top: 1px solid var(--line);
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
  }

  .page-about .about-rail__list::-webkit-scrollbar {
    display: none;
  }

  .page-about .about-rail .rail__link {
    flex: 0 0 auto;
    white-space: nowrap;
    padding: 8px 14px;
    border: 1px solid var(--line);
  }

  .page-about .about-rail .rail__link::before {
    display: none;
  }
}

@media (max-width: 520px) {
  .page-about .about-facts {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-about .flow__step {
    padding-left: 42px;
  }

  .page-about .flow__step::after {
    left: 10px;
  }

  .page-about .about-cta__actions .btn {
    flex: 1 1 100%;
    justify-content: center;
    text-align: center;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-rail .rail__link,
  .page-about .team-bar__fill,
  .page-about .flow__title,
  .page-about .crumbs a {
    transition: none;
  }
}