.page-about {
  --about-rail: 220px;
  position: relative;
  padding-bottom: clamp(48px, 8vw, 96px);
  overflow-x: clip;
}

/* ---------- 面包屑与页首 ---------- */
.page-about .crumbs {
  margin-top: clamp(20px, 3.6vw, 34px);
}

.page-about .about-head {
  padding-block: clamp(24px, 4vw, 44px) clamp(32px, 5vw, 60px);
  border-bottom: 2px solid var(--hull-600);
}

.page-about .about-head__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--sp-2);
}

.page-about .about-head h1 {
  margin-top: 14px;
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: clamp(1.9rem, 4.4vw, 3.5rem);
  line-height: 1.14;
  letter-spacing: -0.015em;
  text-wrap: balance;
  color: var(--text-primary);
}

.page-about .about-head__note {
  position: relative;
  padding: 20px 22px 22px;
  background: var(--glass);
  border: var(--border-hard);
  box-shadow: var(--shadow-hard);
  backdrop-filter: blur(6px);
}

.page-about .about-head__note::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--electric-cyan), var(--cyan-deep) 58%, rgba(14, 116, 144, 0) 100%);
}

.page-about .about-head__note .index-num {
  display: block;
  margin-bottom: 10px;
  color: var(--electric-cyan);
  font-size: 0.76rem;
  letter-spacing: 0.14em;
}

.page-about .about-head__note p:last-child {
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.78;
}

@media (min-width: 900px) {
  .page-about .about-head__grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(260px, 0.85fr);
    gap: var(--sp-3);
    align-items: end;
  }
}

/* ---------- 主分栏 ---------- */
.page-about .about-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--sp-2);
  padding-top: clamp(32px, 5.5vw, 68px);
}

@media (min-width: 1060px) {
  .page-about .about-shell {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(32px, 4vw, 60px);
    align-items: start;
  }
}

/* ---------- 侧栏索引 ---------- */
.page-about .about-toc {
  border: var(--border-hard);
  background: var(--glass);
  padding: 18px;
}

.page-about .about-toc__title {
  padding-bottom: 12px;
  margin-bottom: 12px;
  border-bottom: var(--border-soft);
  font-family: var(--font-data);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--electric-cyan);
}

.page-about .about-toc__list {
  list-style: none;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 2px;
}

.page-about .about-toc__list a {
  display: grid;
  grid-template-columns: 30px minmax(0, 1fr);
  gap: 10px;
  align-items: baseline;
  padding: 9px 8px;
  border-left: 2px solid transparent;
  color: var(--text-muted);
  font-size: 0.9rem;
  line-height: 1.5;
  text-decoration: none;
  transition: color 0.18s ease, border-color 0.18s ease, background-color 0.18s ease;
}

.page-about .about-toc__list a .index-num {
  font-size: 0.72rem;
  color: var(--cyan-deep);
}

.page-about .about-toc__list a:hover,
.page-about .about-toc__list a:focus-visible {
  color: var(--text-primary);
  border-left-color: var(--electric-cyan);
  background: rgba(34, 211, 238, 0.08);
}

.page-about .about-toc__list a:hover .index-num,
.page-about .about-toc__list a:focus-visible .index-num {
  color: var(--electric-cyan);
}

@media (max-width: 1059px) {
  .page-about .about-toc__list {
    grid-auto-flow: column;
    grid-auto-columns: minmax(156px, max-content);
    gap: 8px;
    overflow-x: auto;
    padding-bottom: 6px;
    scrollbar-width: thin;
  }

  .page-about .about-toc__list a {
    border-left: 0;
    border-bottom: 2px solid transparent;
  }

  .page-about .about-toc__list a:hover,
  .page-about .about-toc__list a:focus-visible {
    border-left-color: transparent;
    border-bottom-color: var(--electric-cyan);
  }
}

@media (min-width: 1060px) {
  .page-about .about-toc {
    position: sticky;
    top: calc(var(--header-h) + 20px);
  }
}

/* ---------- 章节基础 ---------- */
.page-about .about-section {
  padding-block: clamp(32px, 4.6vw, 56px);
  border-top: var(--border-soft);
  scroll-margin-top: calc(var(--header-h) + 24px);
}

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

.page-about .about-h2 {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 12px;
  align-items: baseline;
  margin-bottom: 18px;
  font-family: var(--font-heading);
  font-size: clamp(1.28rem, 2.5vw, 1.92rem);
  font-weight: 800;
  line-height: 1.32;
  letter-spacing: -0.005em;
  color: var(--text-primary);
  text-wrap: balance;
}

.page-about .about-h2 .index-num {
  font-size: 0.82rem;
  color: var(--electric-cyan);
  letter-spacing: 0.08em;
}

.page-about .about-p {
  max-width: 46em;
  margin-bottom: 1.05em;
  font-size: clamp(1rem, 1.5vw, 1.08rem);
  line-height: 1.85;
  color: var(--text-primary);
}

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

/* ---------- 栏目模块列表 ---------- */
.page-about .about-modules {
  list-style: none;
  margin-top: var(--sp-2);
  border-top: var(--border-soft);
}

.page-about .about-module {
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr);
  gap: 12px;
  padding: 16px 12px;
  border-bottom: var(--border-soft);
  border-left: 2px solid transparent;
  transition: border-color 0.2s ease, background-color 0.2s ease;
}

.page-about .about-module:hover {
  border-left-color: var(--coral-orange);
  background: rgba(34, 211, 238, 0.05);
}

.page-about .about-module__idx {
  padding-top: 3px;
  font-family: var(--font-data);
  font-size: 0.76rem;
  letter-spacing: 0.06em;
  color: var(--electric-cyan);
}

.page-about .about-module__name {
  margin-bottom: 4px;
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
}

.page-about .about-module__desc {
  font-size: 0.92rem;
  line-height: 1.72;
  color: var(--text-muted);
}

/* ---------- 内容生产线 ---------- */
.page-about .about-flow {
  list-style: none;
  margin: var(--sp-2) 0 0 8px;
  padding-left: 22px;
  border-left: 2px solid var(--grid-line);
  display: grid;
  gap: 28px;
}

.page-about .about-flow__step {
  position: relative;
  display: grid;
  gap: 6px;
}

.page-about .about-flow__step::before {
  content: "";
  position: absolute;
  top: 5px;
  left: -30px;
  width: 14px;
  height: 14px;
  background: var(--abyss-900);
  border: 2px solid var(--electric-cyan);
  transform: rotate(45deg);
}

.page-about .about-flow__step:last-child::before {
  background: var(--coral-orange);
  border-color: var(--coral-orange);
}

.page-about .about-flow__idx {
  font-family: var(--font-data);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: var(--electric-cyan);
}

.page-about .about-flow__title {
  font-family: var(--font-heading);
  font-size: 1.08rem;
  font-weight: 700;
  color: var(--text-primary);
}

.page-about .about-flow__desc {
  max-width: 42em;
  font-size: 0.94rem;
  line-height: 1.76;
  color: var(--text-muted);
}

/* ---------- 图片框 ---------- */
.page-about .about-figure {
  margin: var(--sp-2) 0;
  border: var(--border-hard);
  background: var(--abyss-700);
  box-shadow: var(--shadow-hard);
}

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

.page-about .media-frame__caption {
  display: block;
  padding: 12px 16px;
  border-top: var(--border-soft);
  background: rgba(6, 20, 38, 0.62);
  font-size: 0.84rem;
  line-height: 1.62;
  color: var(--text-muted);
}

.page-about .about-figure--flow {
  margin-top: var(--sp-3);
}

/* ---------- 节奏提示块 ---------- */
.page-about .about-callout {
  margin-top: var(--sp-2);
  padding: 20px 22px;
  border: var(--border-soft);
  border-left: 5px solid var(--coral-orange);
  background: var(--glass);
  backdrop-filter: blur(4px);
}

.page-about .about-callout__k {
  margin-bottom: 8px;
  font-family: var(--font-data);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  color: var(--coral-orange);
}

.page-about .about-callout__v {
  margin-bottom: 8px;
  font-family: var(--font-heading);
  font-size: clamp(1.2rem, 2.4vw, 1.6rem);
  font-weight: 800;
  color: var(--ice-white);
}

.page-about .about-callout__d {
  max-width: 44em;
  font-size: 0.94rem;
  line-height: 1.76;
  color: var(--text-muted);
}

/* ---------- 团队三组 ---------- */
.page-about .about-teams {
  list-style: none;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin: var(--sp-2) 0;
}

.page-about .about-team {
  padding: 18px;
  border: var(--border-hard);
  border-top: 4px solid var(--electric-cyan);
  background: rgba(11, 37, 69, 0.52);
}

.page-about .about-team:nth-child(2) {
  border-top-color: var(--mint-rank);
}

.page-about .about-team:nth-child(3) {
  border-top-color: var(--amber-signal);
}

.page-about .about-team__name {
  margin-bottom: 8px;
  font-family: var(--font-heading);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
}

.page-about .about-team__desc {
  font-size: 0.9rem;
  line-height: 1.74;
  color: var(--text-muted);
}

@media (min-width: 780px) {
  .page-about .about-teams {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: var(--sp-1);
  }
}

/* ---------- 数据条 ---------- */
.page-about .about-stats {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
  margin: var(--sp-2) 0;
}

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

.page-about .about-stat {
  padding: 18px;
  border: var(--border-hard);
  background: rgba(11, 37, 69, 0.5);
}

.page-about .about-stat__label {
  margin-bottom: 10px;
  font-size: 0.86rem;
  line-height: 1.5;
  color: var(--text-muted);
}

.page-about .about-stat__value {
  display: flex;
  align-items: baseline;
  gap: 6px;
  font-family: var(--font-data);
  font-size: clamp(1.5rem, 3vw, 2.05rem);
  font-weight: 700;
  line-height: 1.1;
  color: var(--ice-white);
}

.page-about .about-stat__value small {
  font-family: var(--font-body);
  font-size: 0.82rem;
  font-weight: 400;
  color: var(--text-muted);
}

.page-about .about-meter {
  height: 8px;
  margin-top: 14px;
  background: var(--hull-600);
}

.page-about .about-meter__fill {
  display: block;
  height: 100%;
  width: var(--fill);
  background: var(--electric-cyan);
}

.page-about .about-stat--coral .about-meter__fill {
  background: var(--coral-orange);
}

.page-about .about-stat--mint .about-meter__fill {
  background: var(--mint-rank);
}

/* ---------- 赛季时间轴 ---------- */
.page-about .about-timeline {
  list-style: none;
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(190px, 1fr);
  margin-top: var(--sp-2);
  overflow-x: auto;
  overscroll-behavior-x: contain;
  padding-bottom: 10px;
  scrollbar-width: thin;
  scroll-snap-type: x proximity;
}

.page-about .about-timeline__node {
  position: relative;
  padding: 22px 20px 6px 0;
  border-top: 2px solid var(--grid-line);
  scroll-snap-align: start;
}

.page-about .about-timeline__node::before {
  content: "";
  position: absolute;
  top: -6px;
  left: 0;
  width: 10px;
  height: 10px;
  background: var(--abyss-900);
  border: 2px solid var(--electric-cyan);
}

.page-about .about-timeline__node:last-child::before {
  background: var(--coral-orange);
  border-color: var(--coral-orange);
}

.page-about .about-timeline__stage {
  margin-bottom: 8px;
  font-family: var(--font-data);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  color: var(--electric-cyan);
}

.page-about .about-timeline__text {
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--text-muted);
}

/* ---------- 收束区 ---------- */
.page-about .about-cta {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--sp-2);
  margin-top: var(--sp-3);
  padding: clamp(22px, 4vw, 40px);
  border: var(--border-hard);
  background:
    linear-gradient(135deg, rgba(34, 211, 238, 0.13), rgba(6, 20, 38, 0) 64%),
    var(--abyss-700);
  box-shadow: var(--shadow-hard-lg);
  scroll-margin-top: calc(var(--header-h) + 24px);
}

.page-about .about-cta .about-h2 {
  margin-bottom: 12px;
}

.page-about .about-cta__links {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-cta__links .btn {
  text-decoration: none;
}

@media (min-width: 900px) {
  .page-about .about-cta {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    align-items: center;
    gap: var(--sp-3);
  }

  .page-about .about-cta__links {
    justify-content: flex-end;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-module,
  .page-about .about-toc__list a {
    transition: none;
  }
}

.page-about {
  --fill: currentColor;
}