.page-about {
  --about-shadow: 6px 6px 0 rgba(0, 229, 208, 0.14);
  --about-shadow-soft: 4px 4px 0 rgba(4, 7, 12, 0.55);
  display: block;
  background: var(--bg);
  color: var(--fg);
  overflow-x: clip;
}

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

/* ---------- 面包屑 ---------- */
.page-about .about-crumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  padding-top: clamp(1.25rem, 3vw, 2rem);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.05em;
  color: var(--mist);
}

.page-about .about-crumb a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--dur) var(--ease);
}

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

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-block: clamp(1.5rem, 4vw, 2.5rem) clamp(2rem, 5vw, 3.5rem);
}

.page-about .about-kicker {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem;
  margin: 0 0 clamp(1rem, 3vw, 1.75rem);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  color: var(--mist);
}

.page-about .about-kicker-num {
  display: inline-grid;
  place-items: center;
  width: 2rem;
  height: 2rem;
  border: 2px solid var(--amber);
  color: var(--amber);
  font-weight: 700;
  letter-spacing: 0;
}

.page-about .about-kicker-line {
  flex: 1 1 40px;
  max-width: 130px;
  height: 1px;
  background: var(--line);
}

.page-about .about-h1 {
  margin: 0 0 clamp(1.25rem, 3vw, 1.75rem);
  max-width: 20ch;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.125rem, 7vw, 5rem);
  line-height: 1.04;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-lede {
  margin: 0 0 clamp(1.5rem, 4vw, 2.25rem);
  max-width: 62ch;
  padding-left: clamp(0.875rem, 2vw, 1.25rem);
  border-left: 3px solid var(--cyan);
  font-size: clamp(1rem, 1.5vw, 1.0625rem);
  line-height: 1.9;
  color: var(--paper);
}

.page-about .about-hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.625rem;
}

.page-about .about-hero-tags .tag {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.04em;
  text-decoration: none;
}

.page-about .about-simplified {
  display: inline-block;
  margin: 1.25rem 0 0;
  padding: 0.625rem 0.9375rem;
  border: 1px solid var(--cyan-deep);
  border-left: 3px solid var(--cyan);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  line-height: 1.6;
  color: var(--cyan);
  background: rgba(10, 92, 90, 0.18);
}

.page-about .about-hero-figure {
  margin-top: clamp(2rem, 5vw, 3.5rem);
}

.page-about .about-hero-figure .figure-frame img {
  width: 100%;
  object-fit: cover;
}

/* ---------- 章节通用 ---------- */
.page-about .about-section {
  padding-block: clamp(2.75rem, 7vw, 6rem);
  border-top: 1px solid var(--line);
}

.page-about .about-head {
  margin-bottom: clamp(1.75rem, 4vw, 3rem);
}

.page-about .about-head .sec-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.625rem, 4vw, 3rem);
  line-height: 1.15;
  margin: 0.5rem 0 0.75rem;
}

.page-about .about-head .sec-lede {
  max-width: 58ch;
  margin: 0;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--mist);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-tl-item {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.5rem;
  padding-bottom: clamp(1.25rem, 3vw, 2rem);
}

.page-about .about-tl-year {
  font-family: var(--font-mono);
  font-size: 0.9375rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--amber);
}

.page-about .about-tl-card {
  background: var(--card);
  border: 2px solid var(--line);
  border-left: 3px solid var(--cyan);
  padding: clamp(1rem, 3vw, 1.5rem);
  box-shadow: var(--about-shadow-soft);
}

.page-about .about-tl-card h3 {
  margin: 0 0 0.5rem;
  font-family: var(--font-head);
  font-weight: 600;
  font-size: 1.125rem;
  letter-spacing: 0.02em;
  color: var(--paper);
}

.page-about .about-tl-card p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 栏目矩阵 ---------- */
.page-about .about-columns {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

.page-about .about-col {
  display: flex;
  flex-direction: column;
  gap: 0.625rem;
  padding: clamp(1.25rem, 3vw, 1.75rem);
  background: var(--card);
  border: 2px solid var(--line);
  box-shadow: var(--about-shadow-soft);
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .about-col:hover {
  border-color: var(--cyan);
  transform: translate(-2px, -2px);
}

.page-about .about-col-num {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 700;
  line-height: 1;
  color: var(--alert);
}

.page-about .about-col h3 {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 600;
  font-size: 1.25rem;
  letter-spacing: 0.02em;
  color: var(--paper);
}

.page-about .about-col p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-link {
  align-self: flex-start;
  margin-top: auto;
  padding-bottom: 2px;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.05em;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--cyan-deep);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

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

/* ---------- 青训 ---------- */
.page-about .about-youth {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.75rem, 5vw, 3.5rem);
  align-items: start;
}

.page-about .about-youth-figure .figure-frame img {
  width: 100%;
  object-fit: cover;
}

.page-about .about-youth-list {
  list-style: none;
  margin: 0 0 1.5rem;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .about-youth-list li {
  padding: 1.125rem 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-youth-age {
  display: inline-block;
  margin-bottom: 0.5rem;
  padding: 0.2rem 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--ink);
  background: var(--cyan);
}

.page-about .about-youth-list p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-youth-note {
  margin: 0 0 1.5rem;
  padding-left: 1rem;
  border-left: 2px solid var(--cyan-deep);
  font-size: 0.875rem;
  line-height: 1.85;
  color: var(--mist);
}

/* ---------- 主场地图 ---------- */
.page-about .about-map {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.5rem, 4vw, 2.5rem);
  align-items: start;
}

.page-about .about-map-figure .figure-frame img {
  width: 100%;
  object-fit: cover;
}

.page-about .about-legend {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 2px solid var(--cyan);
}

.page-about .about-legend-item {
  display: grid;
  grid-template-columns: 2.75rem 1fr;
  gap: 0.875rem;
  padding: 1rem 0.5rem 1rem 0;
  border-bottom: 1px solid var(--line);
  transition: background var(--dur) var(--ease), padding-left var(--dur) var(--ease);
}

.page-about .about-legend-item:hover,
.page-about .about-legend-item:focus-visible {
  background: rgba(0, 229, 208, 0.08);
  padding-left: 0.625rem;
  outline: none;
}

.page-about .about-legend-key {
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--alert);
}

.page-about .about-legend-item h3 {
  margin: 0 0 0.375rem;
  font-family: var(--font-head);
  font-weight: 600;
  font-size: 1.0625rem;
  letter-spacing: 0.02em;
  color: var(--paper);
}

.page-about .about-legend-item p {
  margin: 0;
  font-size: 0.875rem;
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 服务对象 ---------- */
.page-about .about-audience {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

.page-about .about-aud {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  padding: clamp(1.25rem, 3vw, 1.75rem);
  background: var(--card);
  border-top: 4px solid var(--cyan);
}

.page-about .about-aud--family {
  border-top-color: var(--amber);
}

.page-about .about-aud--biz {
  border-top-color: var(--alert);
}

.page-about .about-aud-tag {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  color: var(--mist);
}

.page-about .about-aud h3 {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 600;
  font-size: 1.1875rem;
  line-height: 1.35;
  letter-spacing: 0.02em;
  color: var(--paper);
}

.page-about .about-aud p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.85;
  color: var(--mist);
}

/* ---------- 收束带 ---------- */
.page-about .about-closing {
  margin-top: clamp(2rem, 5vw, 4rem);
  padding-block: clamp(2.5rem, 6vw, 4.5rem);
  background: var(--cyan-deep);
  border-top: 2px solid var(--cyan);
  border-bottom: 2px solid var(--cyan);
}

.page-about .about-closing-mark {
  margin: 0 0 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.24em;
  color: var(--amber);
}

.page-about .about-closing h2 {
  margin: 0 0 1rem;
  max-width: 22ch;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.5rem, 4vw, 2.75rem);
  line-height: 1.18;
  color: var(--paper);
}

.page-about .about-closing-text {
  margin: 0 0 1.75rem;
  max-width: 56ch;
  font-size: 0.9375rem;
  line-height: 1.9;
  color: var(--paper);
}

.page-about .about-closing-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

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

/* ---------- 断点 ---------- */
@media (min-width: 640px) {
  .page-about .about-tl-item {
    grid-template-columns: 4.75rem 1fr;
    column-gap: 1.75rem;
    padding-bottom: clamp(1.5rem, 3vw, 2.25rem);
  }

  .page-about .about-tl-item::before {
    content: "";
    position: absolute;
    left: 4.75rem;
    top: 0.55rem;
    bottom: -0.55rem;
    width: 1px;
    background: var(--line);
  }

  .page-about .about-tl-year {
    padding-top: 0.15rem;
    text-align: right;
  }

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

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

@media (min-width: 900px) {
  .page-about .about-youth {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  }

  .page-about .about-map {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  }
}

@media (min-width: 1080px) {
  .page-about .about-tl-item::before {
    left: 4.75rem;
    top: 1.9rem;
    bottom: -0.55rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-tl-card,
  .page-about .about-col,
  .page-about .about-legend-item,
  .page-about .about-link {
    transition: none;
  }

  .page-about .about-col:hover {
    transform: none;
  }
}