.page-about {
  --about-pad: clamp(22px, 3.6vw, 42px);
  --about-gap: clamp(20px, 3.4vw, 38px);
}

/* ---------- 整体骨架 ---------- */
.page-about .about-layout {
  display: grid;
  gap: 22px;
  min-width: 0;
  padding-block: clamp(20px, 3vw, 34px) clamp(52px, 7vw, 96px);
}

.page-about .about-flow {
  display: grid;
  gap: var(--about-gap);
  min-width: 0;
}

@media (min-width: 1000px) {
  .page-about .about-layout {
    grid-template-columns: minmax(0, 206px) minmax(0, 1fr);
    gap: clamp(26px, 3vw, 48px);
    align-items: start;
  }
}

/* ---------- 左侧章节刻度轨 ---------- */
.page-about .about-toc {
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: linear-gradient(180deg, rgba(16, 26, 38, 0.92), rgba(8, 11, 17, 0.92));
  padding: 14px 14px 12px;
  min-width: 0;
}

.page-about .about-toc__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.14em;
  color: var(--muted);
  text-transform: uppercase;
}

.page-about .about-toc__list {
  counter-reset: toc;
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .about-toc__link {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 8px 9px;
  border-radius: var(--r-sm);
  border-left: 2px solid transparent;
  color: var(--text-soft);
  font-size: 14px;
  line-height: 1.35;
  text-decoration: none;
  transition: background 0.18s var(--ease-out), color 0.18s var(--ease-out),
    border-color 0.18s var(--ease-out);
}

.page-about .about-toc__link::before {
  counter-increment: toc;
  content: counter(toc, decimal-leading-zero);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  color: var(--muted);
  flex: none;
}

.page-about .about-toc__link:hover,
.page-about .about-toc__link:focus-visible {
  background: rgba(180, 255, 57, 0.09);
  border-left-color: var(--lime);
  color: var(--lime);
}

.page-about .about-toc__link:hover::before,
.page-about .about-toc__link:focus-visible::before {
  color: var(--lime);
}

@media (min-width: 1000px) {
  .page-about .about-toc {
    position: sticky;
    top: calc(var(--frame-h) + 16px);
    z-index: 4;
  }
}

@media (max-width: 999px) {
  .page-about .about-toc__list {
    grid-auto-flow: column;
    grid-auto-columns: max-content;
    overflow-x: auto;
    gap: 6px;
    padding-bottom: 4px;
    scrollbar-width: thin;
  }
  .page-about .about-toc__link {
    border-left: 0;
    border-bottom: 2px solid transparent;
    white-space: nowrap;
  }
  .page-about .about-toc__link:hover,
  .page-about .about-toc__link:focus-visible {
    border-left-color: transparent;
    border-bottom-color: var(--lime);
  }
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  padding: var(--about-pad);
  background:
    radial-gradient(120% 150% at 90% -10%, rgba(124, 58, 237, 0.34), transparent 62%),
    radial-gradient(90% 130% at -5% 110%, rgba(76, 201, 240, 0.16), transparent 55%),
    linear-gradient(158deg, #101a26 0%, #080b11 72%);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(
    0deg,
    rgba(232, 240, 255, 0.045) 0 1px,
    transparent 1px 5px
  );
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -14%;
  bottom: -34%;
  left: 38%;
  height: 190px;
  transform: rotate(-7deg);
  background: repeating-linear-gradient(
    112deg,
    rgba(180, 255, 57, 0.3) 0 2px,
    transparent 2px 15px
  );
  -webkit-mask-image: linear-gradient(90deg, transparent, #000 45%, #000);
  mask-image: linear-gradient(90deg, transparent, #000 45%, #000);
  pointer-events: none;
  opacity: 0.55;
}

.page-about .about-hero > * {
  position: relative;
  z-index: 1;
}

.page-about .about-hero__kicker {
  margin: 16px 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.14em;
  color: var(--lime);
  text-transform: uppercase;
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  max-width: 21ch;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(30px, 5.4vw, 58px);
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: var(--text);
}

.page-about .about-hero__lede {
  margin: 18px 0 0;
  max-width: 62ch;
  font-size: 17px;
  line-height: 1.75;
  color: var(--text-soft);
}

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

/* ---------- 首屏数据条 ---------- */
.page-about .about-stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

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

.page-about .about-stat {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: linear-gradient(150deg, rgba(27, 47, 82, 0.55), rgba(16, 26, 38, 0.9));
  padding: 16px 16px 16px 22px;
}

.page-about .about-stat::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: var(--lime);
}

.page-about .about-stat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(22px, 3vw, 30px);
  font-weight: 700;
  line-height: 1.1;
  color: var(--lime);
  font-variant-numeric: tabular-nums;
}

.page-about .about-stat__label {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--muted);
}

/* ---------- 内容区块 ---------- */
.page-about .about-block {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  padding: var(--about-pad);
  background: linear-gradient(180deg, rgba(16, 26, 38, 0.95), rgba(16, 26, 38, 0.5));
}

.page-about .about-block--indigo {
  background: linear-gradient(152deg, #1b2f52 0%, #101a26 60%, #080b11 100%);
}

.page-about .about-block--teal {
  background: linear-gradient(152deg, #0e3b37 0%, #101a26 60%, #080b11 100%);
}

.page-about .about-block--wine {
  background: linear-gradient(152deg, #3a1b2e 0%, #101a26 60%, #080b11 100%);
}

.page-about .about-block__kicker {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.14em;
  color: var(--lime);
  text-transform: uppercase;
}

.page-about .about-block h2 {
  margin: 12px 0 0;
  max-width: 26ch;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(23px, 3.4vw, 36px);
  line-height: 1.18;
  letter-spacing: -0.015em;
  color: var(--text);
}

.page-about .about-split {
  display: grid;
  gap: 22px;
  margin-top: 24px;
}

@media (min-width: 880px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: 32px;
    align-items: start;
  }
  .page-about .about-split--reverse {
    grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
  }
}

.page-about .about-copy p {
  margin: 0 0 16px;
  max-width: 66ch;
  font-size: 16.5px;
  line-height: 1.78;
  color: var(--text-soft);
}

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

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

.page-about .about-points li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 11px;
  align-items: start;
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
  background: rgba(8, 11, 17, 0.55);
  padding: 12px 14px;
  font-size: 15px;
  line-height: 1.62;
  color: var(--text-soft);
}

.page-about .about-points li::before {
  content: "";
  width: 8px;
  height: 8px;
  margin-top: 7px;
  border-radius: 2px;
  background: var(--ice);
  box-shadow: 0 0 0 3px rgba(76, 201, 240, 0.16);
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 24px 0 0;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  overflow: hidden;
  background: var(--void);
}

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

.page-about .about-figure figcaption {
  padding: 12px 16px;
  border-top: 1px solid var(--line);
  background: rgba(8, 11, 17, 0.6);
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
}

@media (min-width: 880px) {
  .page-about .about-figure--wide img {
    max-height: 340px;
  }
  .page-about .about-figure--tall {
    margin-top: 0;
  }
}

/* ---------- 赛区网格 ---------- */
.page-about .about-zones {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
}

.page-about .about-zone {
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
  background: rgba(8, 11, 17, 0.55);
  padding: 14px;
  transition: transform 0.18s var(--ease-out), border-color 0.18s var(--ease-out);
}

.page-about .about-zone:hover {
  transform: translateY(-2px);
  border-color: rgba(76, 201, 240, 0.5);
}

.page-about .about-zone__name {
  margin: 0;
  font-size: 15px;
  font-weight: 700;
  color: var(--text);
}

.page-about .about-zone__desc {
  margin: 7px 0 0;
  font-size: 13px;
  line-height: 1.62;
  color: var(--muted);
}

/* ---------- 场景筛选与卡片 ---------- */
.page-about .about-filters {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-top: 22px;
}

.page-about .about-scenes {
  display: grid;
  gap: 14px;
  margin-top: 18px;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

.page-about .about-scene {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: rgba(8, 11, 17, 0.55);
  padding: 18px 18px 18px 22px;
  transition: transform 0.18s var(--ease-out), border-color 0.18s var(--ease-out);
}

.page-about .about-scene::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--line);
  transition: background 0.18s var(--ease-out);
}

.page-about .about-scene:hover {
  transform: translateY(-2px);
  border-color: rgba(180, 255, 57, 0.42);
}

.page-about .about-scene:hover::before {
  background: var(--lime);
}

.page-about .about-scene__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 800;
  line-height: 1.3;
  color: var(--text);
}

.page-about .about-scene__text {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--text-soft);
}

/* ---------- 发展历程 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: 26px 0 0;
  padding: 0 0 0 22px;
  border-left: 2px solid var(--line);
  display: grid;
  gap: 14px;
}

.page-about .about-timeline > li {
  position: relative;
}

.page-about .about-timeline > li::before {
  content: "";
  position: absolute;
  left: -30px;
  top: 18px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--void);
  border: 2px solid var(--lime);
  box-shadow: 0 0 0 4px rgba(180, 255, 57, 0.13);
}

.page-about .about-step {
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: rgba(8, 11, 17, 0.55);
  overflow: hidden;
}

.page-about .about-step summary {
  position: relative;
  cursor: pointer;
  list-style: none;
  padding: 15px 46px 15px 16px;
  font-family: var(--font-display);
  font-size: 16.5px;
  font-weight: 800;
  line-height: 1.4;
  color: var(--text);
}

.page-about .about-step summary::-webkit-details-marker {
  display: none;
}

.page-about .about-step summary::after {
  content: "+";
  position: absolute;
  right: 16px;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 400;
  line-height: 1;
  color: var(--lime);
}

.page-about .about-step[open] summary::after {
  content: "–";
}

.page-about .about-step summary:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: -2px;
}

.page-about .about-step__phase {
  display: inline-block;
  margin-right: 10px;
  padding: 3px 9px;
  border-radius: 999px;
  background: rgba(124, 58, 237, 0.28);
  border: 1px solid rgba(167, 139, 250, 0.45);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--violet-text);
  vertical-align: middle;
}

.page-about .about-step p {
  margin: 0;
  padding: 0 18px 17px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 维护角色 ---------- */
.page-about .about-roles {
  display: grid;
  gap: 12px;
}

.page-about .about-role {
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: rgba(8, 11, 17, 0.55);
  padding: 16px 18px;
  border-left: 3px solid var(--violet);
}

.page-about .about-role__name {
  margin: 0;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 800;
  color: var(--text);
}

.page-about .about-role__text {
  margin: 9px 0 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--text-soft);
}

/* ---------- 备案与主体信息 ---------- */
.page-about .about-identity {
  display: grid;
  gap: 12px;
  margin-top: 24px;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
}

.page-about .about-identity__item {
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: rgba(8, 11, 17, 0.55);
  padding: 16px 18px;
}

.page-about .about-identity__label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.12em;
  color: var(--muted);
  text-transform: uppercase;
}

.page-about .about-identity__value {
  margin: 9px 0 0;
  font-size: 16px;
  line-height: 1.55;
  color: var(--text);
  overflow-wrap: anywhere;
}

.page-about .about-identity__note {
  margin: 22px 0 0;
  max-width: 66ch;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--text-soft);
}

.page-about .about-inline-link {
  color: var(--violet-text);
  text-decoration: none;
  border-bottom: 1px solid rgba(167, 139, 250, 0.5);
  transition: color 0.18s var(--ease-out), border-color 0.18s var(--ease-out);
}

.page-about .about-inline-link:hover,
.page-about .about-inline-link:focus-visible {
  color: var(--lime);
  border-bottom-color: var(--lime);
}

/* ---------- 降级与无障碍 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-zone,
  .page-about .about-scene,
  .page-about .about-toc__link,
  .page-about .about-inline-link,
  .page-about .about-scene::before {
    transition: none;
  }
  .page-about .about-zone:hover,
  .page-about .about-scene:hover {
    transform: none;
  }
}