.page-about {
  --about-gold-soft: rgba(212, 168, 67, 0.14);
  --about-red-soft: rgba(224, 74, 58, 0.1);
  --about-line-soft: rgba(46, 64, 87, 0.45);
  --about-dot-size: 4px;
  background: var(--bg-deep);
  color: var(--text-warm);
  min-width: 0;
  overflow: hidden;
  font-family: var(--font-sans);
}

/* ========== Hero ========== */
.page-about__hero {
  background:
    linear-gradient(180deg, rgba(10, 17, 26, 0.2) 0%, var(--bg-deep) 100%),
    radial-gradient(ellipse at 85% 20%, rgba(20, 38, 58, 0.6) 0%, transparent 55%),
    var(--bg-ink);
  border-bottom: 1px solid var(--line);
  padding: 2.5rem 1.25rem 2rem;
  position: relative;
}

.page-about__hero::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--gold) 0%, var(--gold) 32%, transparent 32%, transparent 64%, var(--red) 64%, var(--red) 100%);
  opacity: 0.7;
  pointer-events: none;
}

.page-about__hero-inner {
  max-width: var(--maxw);
  margin: 0 auto;
}

.page-about__breadcrumb {
  margin-bottom: 1.75rem;
}

.page-about__hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  align-items: start;
}

.page-about__hero-main {
  position: relative;
  padding-left: 0.75rem;
  border-left: 2px solid var(--gold);
}

.page-about__hero-kicker {
  margin-bottom: 0.75rem;
  letter-spacing: 0.12em;
}

.page-about__hero-title {
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 900;
  line-height: 1.15;
  margin: 0 0 0.5rem;
  color: var(--white);
  letter-spacing: -0.02em;
}

.page-about__hero-subtitle {
  font-size: 1.05rem;
  color: var(--gold);
  font-weight: 600;
  margin: 0 0 1rem;
  padding-bottom: 1rem;
  border-bottom: 1px dashed var(--line);
}

.page-about__hero-desc {
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--slate);
  max-width: 54ch;
  margin: 0;
}

.page-about__hero-panel {
  position: relative;
  padding: 1.25rem 1.5rem 2.75rem;
  border-radius: 2px;
  overflow: hidden;
}

.page-about__hero-panel-label {
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  color: var(--muted);
  margin: 0 0 1rem;
}

.page-about__hero-meta {
  margin: 0;
  display: flex;
  flex-direction: column;
}

.page-about__hero-meta-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
  padding: 0.7rem 0;
  border-bottom: 1px solid var(--line);
}

.page-about__hero-meta-row:last-child {
  border-bottom: none;
}

.page-about__hero-meta-row dt {
  color: var(--muted);
  font-size: 0.82rem;
}

.page-about__hero-meta-row dd {
  margin: 0;
  color: var(--text-warm);
  font-size: 0.9rem;
  font-weight: 600;
  text-align: right;
}

.page-about__hero-panel-bar {
  position: absolute;
  right: 0;
  bottom: 0;
  width: 64px;
  height: 4px;
  background: linear-gradient(90deg, var(--gold) 0%, rgba(212, 168, 67, 0) 100%);
}

.page-about__hero-panel::after {
  content: "";
  position: absolute;
  left: -30px;
  bottom: -30px;
  width: 90px;
  height: 90px;
  background: radial-gradient(circle at center, var(--about-gold-soft) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

/* ========== 主体布局 ========== */
.page-about__layout {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 1.25rem 3rem;
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
}

.page-about__rail-inner {
  position: sticky;
  top: 1.25rem;
  background: linear-gradient(160deg, rgba(20, 38, 58, 0.72) 0%, rgba(10, 17, 26, 0.6) 100%);
  border: 1px solid var(--line);
  border-left: 3px solid var(--gold);
  border-radius: 2px;
  padding: 1.75rem 1.5rem 2rem;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.page-about__rail-label {
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  color: var(--muted);
  margin: 0 0 1rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px dashed var(--line);
}

.page-about__manifesto {
  margin: 0 0 1.75rem;
  position: relative;
  padding-left: 1.25rem;
}

.page-about__manifesto p {
  font-size: 1rem;
  line-height: 1.75;
  color: var(--text-warm);
  margin: 0;
}

.page-about__manifesto-mark {
  position: absolute;
  left: 0;
  top: -4px;
  font-size: 2rem;
  color: var(--gold);
  font-family: Georgia, serif;
  line-height: 1;
}

.page-about__rail-stats {
  list-style: none;
  margin: 0 0 1.75rem;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem 0.75rem;
}

.page-about__rail-stat {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  padding: 0.75rem 0.5rem;
  background: rgba(10, 17, 26, 0.35);
  border: 1px solid var(--about-line-soft);
  border-radius: 2px;
}

.page-about__stat-num {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--gold);
  line-height: 1;
  letter-spacing: 0;
}

.page-about__stat-unit {
  font-size: 0.8rem;
  color: var(--muted);
  margin-left: 0.15rem;
}

.page-about__stat-label {
  font-size: 0.78rem;
  color: var(--slate);
  line-height: 1.4;
}

.page-about__rail-links {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.page-about__rail-links .btn-ghost,
.page-about__rail-links .btn-gold {
  width: 100%;
  box-sizing: border-box;
  text-align: center;
  font-size: 0.85rem;
}

/* ========== 内容区通用 ========== */
.page-about__content {
  min-width: 0;
}

.page-about__toc {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.35rem 1rem;
  padding: 0.75rem 0 1.25rem;
  margin-bottom: 2rem;
  border-bottom: 1px solid var(--line);
  overflow-x: auto;
}

.page-about__toc-label {
  font-size: 0.78rem;
  letter-spacing: 0.16em;
  color: var(--muted);
  white-space: nowrap;
}

.page-about__toc a {
  color: var(--slate);
  font-size: 0.78rem;
  text-decoration: none;
  padding: 0.25rem 0;
  border-bottom: 1px solid transparent;
  white-space: nowrap;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.page-about__toc a:hover,
.page-about__toc a:focus {
  color: var(--gold);
  border-bottom-color: var(--gold);
}

.page-about__section {
  padding: 3rem 0;
  border-bottom: 1px solid var(--line);
}

.page-about__section:first-of-type {
  padding-top: 0.75rem;
}

.page-about__section-head {
  margin-bottom: 2rem;
}

.page-about__section-head .section-kicker {
  font-size: 0.8rem;
  letter-spacing: 0.15em;
  color: var(--gold);
  margin-bottom: 0.5rem;
  font-weight: 600;
}

.page-about__section-head .section-title {
  font-size: clamp(1.45rem, 2.8vw, 2.1rem);
  font-weight: 900;
  line-height: 1.2;
  color: var(--white);
  margin: 0;
  padding-bottom: 1rem;
  position: relative;
}

.page-about__section-head .section-title::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 56px;
  height: 3px;
  background: linear-gradient(90deg, var(--gold) 0%, transparent 100%);
}

.page-about__section-desc {
  margin-top: 1.25rem;
  font-size: 0.95rem;
  line-height: 1.75;
  color: var(--slate);
  max-width: 68ch;
}

/* ========== 01 编辑部式品牌说明 ========== */
.page-about__editorial-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

.page-about__editorial-copy p {
  margin-top: 0;
  margin-bottom: 1.1rem;
  font-size: 0.96rem;
  line-height: 1.8;
}

.page-about__editorial-copy p:first-child::first-letter {
  font-size: 2.6rem;
  font-weight: 900;
  float: left;
  line-height: 1;
  margin-right: 0.35rem;
  color: var(--gold);
  font-family: Georgia, serif;
  padding-top: 4px;
}

.page-about__editorial-figure {
  margin: 0;
  position: relative;
  border: 1px solid var(--line);
  border-radius: 2px;
  background: var(--bg-panel);
  overflow: hidden;
}

.page-about__editorial-figure img {
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  aspect-ratio: 4 / 3;
  display: block;
}

.page-about__editorial-figure figcaption,
.page-about__map-figure figcaption,
.page-about__team-figure figcaption {
  font-size: 0.82rem;
  color: var(--muted);
  padding: 0.9rem 1rem;
  border-top: 1px solid var(--line);
  background: rgba(6, 12, 20, 0.5);
  line-height: 1.6;
}

/* ========== 02 数据地图 ========== */
.page-about__section--map {
  position: relative;
}

.page-about__section--map::before {
  content: "";
  position: absolute;
  top: 3.5rem;
  right: -2rem;
  width: 140px;
  height: 140px;
  background-image: radial-gradient(circle, var(--about-line-soft) 1px, transparent 1px);
  background-size: 14px 14px;
  pointer-events: none;
  opacity: 0.5;
  mask-image: radial-gradient(circle, transparent 10%, rgba(0,0,0,0.6) 60%, transparent 100%);
  -webkit-mask-image: radial-gradient(circle, transparent 10%, rgba(0,0,0,0.6) 60%, transparent 100%);
}

.page-about__league-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.75rem;
  margin: 2rem 0;
}

.page-about__league-node {
  position: relative;
  padding: 1.25rem 1.25rem 1.5rem;
  border-radius: 2px;
  border: 1px solid var(--line);
  background: linear-gradient(140deg, rgba(20, 38, 58, 0.8) 0%, rgba(10, 17, 26, 0.6) 100%);
  overflow: hidden;
  transition: border-color 0.2s ease, background 0.2s ease;
}

.page-about__league-node:hover,
.page-about__league-node:focus-within {
  border-color: var(--gold);
  background: linear-gradient(140deg, rgba(32, 54, 78, 0.85) 0%, rgba(12, 21, 31, 0.7) 100%);
}

.page-about__league-node::before {
  content: "";
  position: absolute;
  right: 0;
  top: 0;
  width: 42px;
  height: 4px;
  background: linear-gradient(270deg, var(--teal) 0%, transparent 100%);
  opacity: 0.5;
  transition: opacity 0.2s ease;
}

.page-about__league-node:hover::before {
  opacity: 1;
}

.page-about__league-index {
  font-size: 0.72rem;
  color: var(--muted);
  position: absolute;
  top: 1rem;
  right: 1rem;
}

.page-about__league-code {
  display: inline-block;
  font-size: 0.8rem;
  letter-spacing: 0.12em;
  color: var(--gold);
  margin-bottom: 0.5rem;
  padding: 0.2rem 0.45rem;
  border: 1px solid var(--about-gold-soft);
  border-radius: 2px;
}

.page-about__league-node h3 {
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--white);
  margin: 0 0 0.4rem;
}

.page-about__league-node p {
  font-size: 0.82rem;
  color: var(--slate);
  margin: 0 0 1rem;
  line-height: 1.6;
}

.page-about__league-node .data-chip {
  align-self: flex-start;
}

.page-about__map-figure,
.page-about__team-figure {
  margin: 1.5rem 0 0;
  border: 1px solid var(--line);
  border-radius: 2px;
  background: var(--bg-panel);
  overflow: hidden;
}

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

.page-about__map-figure img {
  aspect-ratio: 5 / 3;
}

.page-about__team-figure img {
  aspect-ratio: 16 / 10;
}

/* ========== 03 发展节拍 ========== */
.page-about__timeline {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 0;
  margin-top: 2rem;
}

.page-about__tl-item {
  display: grid;
  grid-template-columns: 56px 1fr;
  gap: 0.75rem;
  position: relative;
  padding-bottom: 2.25rem;
}

.page-about__tl-item:last-child {
  padding-bottom: 0.75rem;
}

.page-about__tl-track {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  z-index: 1;
}

.page-about__tl-ruler {
  position: absolute;
  top: -1.5rem;
  left: 50%;
  width: 1px;
  height: calc(100% + 3rem);
  background: transparent;
  border-left: 1px dashed var(--about-line-soft);
  z-index: 0;
}

.page-about__tl-item:first-child .page-about__tl-ruler {
  display: block;
}

.page-about__tl-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--slate);
  border: 2px solid var(--bg-deep);
  box-shadow: 0 0 0 1px var(--line);
  flex-shrink: 0;
  margin-top: 0.9rem;
  z-index: 2;
}

.page-about__tl-dot--gold {
  background: var(--gold);
  box-shadow: 0 0 0 1px var(--gold), 0 0 12px rgba(212, 168, 67, 0.35);
}

.page-about__tl-version {
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--gold);
  margin-top: 0.4rem;
  font-weight: 700;
}

.page-about__tl-body {
  padding: 1.25rem 1.25rem 1.5rem;
  border-radius: 2px;
  border: 1px solid var(--line);
  background: linear-gradient(160deg, rgba(20, 38, 58, 0.8) 0%, rgba(10, 17, 26, 0.55) 100%);
  min-width: 0;
}

.page-about__tl-meta {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-bottom: 0.9rem;
}

.page-about__tl-date {
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--muted);
}

.page-about__tl-body h3 {
  font-size: 1.08rem;
  font-weight: 800;
  color: var(--white);
  margin: 0 0 0.55rem;
}

.page-about__tl-body p {
  font-size: 0.88rem;
  line-height: 1.75;
  color: var(--slate);
  margin: 0;
}

/* ========== 04 团队与守则 ========== */
.page-about__team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.9rem;
  margin: 2rem 0 1.75rem;
}

.page-about__team-card {
  position: relative;
  padding: 1.6rem 1.5rem;
  border-radius: 2px;
  border: 1px solid var(--line);
  background: linear-gradient(130deg, rgba(20, 38, 58, 0.8) 0%, rgba(10, 17, 26, 0.55) 100%);
  overflow: hidden;
  transition: border-color 0.2s ease;
}

.page-about__team-card:hover {
  border-color: var(--gold);
}

.page-about__team-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  font-size: 1rem;
  font-weight: 800;
  color: var(--gold);
  border: 1px solid var(--about-gold-soft);
  border-radius: 2px;
  margin-bottom: 1rem;
  background: rgba(212, 168, 67, 0.08);
}

.page-about__team-card h3 {
  font-size: 1.05rem;
  font-weight: 800;
  color: var(--white);
  margin: 0 0 0.5rem;
}

.page-about__team-card p {
  font-size: 0.87rem;
  line-height: 1.7;
  color: var(--slate);
  margin: 0;
}

.page-about__ethics {
  margin: 1.75rem 0 2rem;
  border: 1px solid var(--line);
  border-left: 3px solid var(--red);
  background: rgba(224, 74, 58, 0.04);
  border-radius: 2px;
  padding: 1.5rem 1.5rem 1.75rem;
}

.page-about__ethics-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 1rem;
}

.page-about__ethics-head h3 {
  font-size: 1rem;
  font-weight: 800;
  color: var(--white);
  margin: 0;
}

.page-about__ethics-caption {
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: var(--muted);
}

.page-about__ethics-list {
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: ethics;
  display: flex;
  flex-direction: column;
  gap: 0.7rem;
}

.page-about__ethics-list li {
  counter-increment: ethics;
  position: relative;
  padding-left: 2.2rem;
  font-size: 0.88rem;
  line-height: 1.7;
  color: var(--text-warm);
}

.page-about__ethics-list li::before {
  content: counter(ethics, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 0;
  font-family: var(--font-data);
  font-size: 0.78rem;
  color: var(--red);
  font-weight: 700;
  background: rgba(224, 74, 58, 0.1);
  padding: 0.15rem 0.35rem;
  border-radius: 2px;
}

/* ========== 尾部导航 ========== */
.page-about__next {
  margin-top: 3rem;
  padding: 2rem 1.5rem;
  border-radius: 2px;
  border: 1px solid var(--line);
  background: linear-gradient(155deg, rgba(20, 38, 58, 0.9) 0%, rgba(10, 17, 26, 0.7) 100%);
  position: relative;
  overflow: hidden;
}

.page-about__next::before {
  content: "";
  position: absolute;
  left: -40px;
  bottom: -80px;
  width: 200px;
  height: 140px;
  background: linear-gradient(90deg, rgba(212, 168, 67, 0.12) 0%, transparent 100%);
  transform: skewY(-14deg);
  pointer-events: none;
}

.page-about__next-copy {
  position: relative;
  z-index: 1;
}

.page-about__next-copy .section-kicker {
  font-size: 0.78rem;
  letter-spacing: 0.15em;
  color: var(--gold);
  margin-bottom: 0.4rem;
}

.page-about__next-copy h2 {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--white);
  margin: 0 0 0.5rem;
}

.page-about__next-copy p:not(.section-kicker) {
  font-size: 0.88rem;
  color: var(--slate);
  margin: 0 0 1.5rem;
  line-height: 1.7;
}

.page-about__next-links {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  align-items: flex-start;
}

.page-about__next-links .btn-ghost,
.page-about__next-links .btn-gold {
  font-size: 0.86rem;
}

/* ========== 响应式 ========== */
@media (min-width: 48rem) {
  .page-about__hero {
    padding: 3.5rem 1.25rem 2.75rem;
  }

  .page-about__hero-grid {
    grid-template-columns: 1fr 330px;
    gap: 2.5rem;
  }

  .page-about__layout {
    grid-template-columns: 280px 1fr;
    gap: 3rem;
    padding: 0 1.25rem 4.5rem;
  }

  .page-about__rail-inner {
    top: 1.5rem;
  }

  .page-about__section {
    padding: 4.5rem 0;
  }

  .page-about__section:first-of-type {
    padding-top: 1.25rem;
  }

  .page-about__editorial-grid {
    grid-template-columns: 1.2fr 0.8fr;
    gap: 3rem;
    align-items: start;
  }

  .page-about__league-grid {
    grid-template-columns: 1fr 1fr 1fr;
    gap: 0.9rem;
  }

  .page-about__team-grid {
    grid-template-columns: 1fr 1fr 1fr;
    gap: 1rem;
  }

  .page-about__next {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 2rem;
    padding: 2.25rem 2.25rem 2.25rem 2.5rem;
  }

  .page-about__next-copy {
    flex: 1;
  }

  .page-about__next-copy p:not(.section-kicker) {
    margin-bottom: 0;
  }

  .page-about__next-links {
    flex-direction: row;
    justify-content: flex-end;
    flex-shrink: 0;
    gap: 0.75rem;
  }
}

@media (min-width: 64rem) {
  .page-about__layout {
    gap: 4rem;
  }

  .page-about__tl-item {
    grid-template-columns: 76px 1fr;
    gap: 1.25rem;
  }

  .page-about__tl-body {
    padding: 1.5rem 1.75rem 1.75rem;
  }

  .page-about__tl-version {
    font-size: 0.8rem;
  }
}