.page-about {
  background: var(--ink-900);
  color: var(--text-soft);
}

.page-about .about-crumb {
  padding-block: clamp(1rem, 2.6vw, 1.75rem) 0;
}

.page-about .breadcrumb {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  color: var(--text-dim);
}

.page-about .breadcrumb a {
  color: var(--cyan);
  text-decoration: none;
}

.page-about .breadcrumb a:hover {
  text-decoration: underline;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  padding-block: clamp(1.5rem, 4vw, 2.75rem) clamp(2rem, 5vw, 3.5rem);
  background:
    radial-gradient(120% 90% at 84% -10%, rgba(26, 18, 48, 0.92) 0%, rgba(7, 26, 46, 0) 62%),
    linear-gradient(180deg, var(--ink-900) 0%, var(--ink-800) 58%, var(--ink-900) 100%);
  overflow: hidden;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: radial-gradient(rgba(245, 240, 230, 0.16) 1px, transparent 1.4px);
  background-size: 46px 46px;
  opacity: 0.4;
  pointer-events: none;
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.85), transparent 76%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.85), transparent 76%);
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
  align-items: start;
}

.page-about .about-hero__vlabel {
  display: none;
  margin: 0;
  padding-top: 0.4rem;
  writing-mode: vertical-rl;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.32em;
  color: var(--dust);
}

.page-about .about-hero__lede h1 {
  margin: 0.4rem 0 0;
  max-width: 22ch;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.85rem, 5.6vw, 3.4rem);
  line-height: 1.14;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .about-hero__lede .lede {
  margin-top: 1.1rem;
  max-width: 60ch;
}

.page-about .about-hero__figures {
  list-style: none;
  margin: 1.75rem 0 0;
  padding: 1.25rem 0 0;
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  border-top: 1px solid var(--line);
}

.page-about .about-hero__figures li {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  padding-left: 0.9rem;
  border-left: 2px solid var(--line-cyan);
}

.page-about .about-hero__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.5rem, 4vw, 2.05rem);
  line-height: 1;
  color: var(--green);
}

.page-about .about-hero__figures li > span:last-child {
  font-size: 0.85rem;
  line-height: 1.6;
  color: var(--text-dim);
}

.page-about .about-hero__figure {
  position: relative;
  margin: clamp(1.75rem, 4vw, 2.75rem) 0 0;
  aspect-ratio: 14 / 9;
  overflow: hidden;
  border-radius: var(--radius);
}

.page-about .about-hero__figure img,
.page-about .about-lines__figure img,
.page-about .about-seasons__figure img {
  display: block;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
}

/* ---------- 斜切分隔 ---------- */

.page-about .about-slash {
  height: 1px;
  margin-block: clamp(1.5rem, 4vw, 2.5rem);
  background: linear-gradient(
    90deg,
    transparent 0%,
    var(--line-cyan) 16%,
    var(--bronze) 50%,
    var(--line-cyan) 84%,
    transparent 100%
  );
  transform: skewY(-0.6deg);
}

/* ---------- 正文双栏 ---------- */

.page-about .about-body {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  padding-bottom: clamp(3rem, 7vw, 5rem);
}

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

.page-about .about-stream {
  min-width: 0;
}

/* ---------- 章节 ---------- */

.page-about .about-chapter {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  padding: clamp(1.4rem, 4vw, 2.75rem);
  margin-bottom: clamp(1rem, 3vw, 1.75rem);
  border-radius: var(--radius);
}

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

.page-about .about-chapter--paper {
  background-color: var(--paper);
  background-image: linear-gradient(180deg, rgba(255, 255, 255, 0.55), rgba(235, 227, 212, 0.4));
  color: var(--paper-ink);
}

.page-about .about-chapter--paper .section-title {
  color: var(--paper-ink);
}

.page-about .about-chapter--paper .about-prose {
  color: #333b45;
}

.page-about .about-chapter--paper a {
  color: var(--cyan-deep);
}

.page-about .about-chapter--dark {
  background: linear-gradient(158deg, var(--ink-800) 0%, var(--ink-900) 72%);
  border: 1px solid var(--line);
}

.page-about .about-chapter--deep {
  background: linear-gradient(155deg, var(--ink-700) 0%, var(--ink-950) 92%);
  border: 1px solid var(--line-cyan);
}

.page-about .about-chapter--dark .section-title,
.page-about .about-chapter--deep .section-title {
  color: var(--paper);
}

.page-about .about-chapter__side {
  margin: 0;
  justify-self: start;
  writing-mode: horizontal-tb;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  color: var(--bronze);
  border-left: 2px solid var(--bronze);
  padding-left: 0.6rem;
}

.page-about .about-chapter__body {
  min-width: 0;
}

.page-about .about-chapter__body > * + * {
  margin-top: 1.05rem;
}

.page-about .section-title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.4rem, 3.4vw, 2.15rem);
  line-height: 1.26;
  letter-spacing: -0.01em;
}

.page-about .about-prose {
  margin: 0;
  max-width: 68ch;
  font-size: 1.02rem;
  line-height: 1.95;
  color: var(--text-soft);
}

/* ---------- 三条内容线 ---------- */

.page-about .about-lines {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  margin-top: 1.5rem;
}

.page-about .about-line {
  position: relative;
  padding: 1.35rem 1.3rem 1.45rem;
  background: rgba(15, 44, 72, 0.55);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: transform 0.25s var(--ease), border-color 0.25s var(--ease), background 0.25s var(--ease);
}

.page-about .about-line::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 0;
  width: 52px;
  height: 52px;
  background: linear-gradient(315deg, rgba(55, 226, 213, 0.26), transparent 64%);
  clip-path: polygon(100% 100%, 100% 0, 0 100%);
  pointer-events: none;
}

.page-about .about-line:hover,
.page-about .about-line:focus {
  transform: translateY(-4px);
  border-color: var(--line-cyan);
  background: rgba(15, 44, 72, 0.82);
}

.page-about .about-line:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 4px;
}

.page-about .about-line__title {
  margin: 0.7rem 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1.18rem;
  color: var(--paper);
}

.page-about .about-line__time {
  margin: 0.45rem 0 0;
  font-size: 0.86rem;
  line-height: 1.7;
  color: var(--text-dim);
}

.page-about .about-line__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.35rem;
  color: var(--green);
}

.page-about .about-line__desc {
  margin: 0.75rem 0 0;
  font-size: 0.95rem;
  line-height: 1.85;
  color: var(--text-soft);
}

.page-about .about-line__note {
  max-height: 0;
  margin: 0;
  padding-left: 0;
  overflow: hidden;
  opacity: 0;
  font-size: 0.85rem;
  line-height: 1.8;
  color: var(--cyan);
  border-left: 0 solid var(--bronze);
  transition: max-height 0.32s var(--ease), opacity 0.25s var(--ease),
    margin-top 0.32s var(--ease), padding-left 0.32s var(--ease), border-left-width 0.32s var(--ease);
}

.page-about .about-line:hover .about-line__note,
.page-about .about-line:focus .about-line__note {
  max-height: 10rem;
  margin-top: 0.85rem;
  padding-left: 0.75rem;
  opacity: 1;
  border-left-width: 2px;
}

.page-about .about-lines__figure {
  margin: 1.75rem 0 0;
  aspect-ratio: 3 / 2;
  overflow: hidden;
  border-radius: var(--radius);
}

/* ---------- 运营中心数据条 ---------- */

.page-about .about-ops {
  list-style: none;
  margin: 1.6rem 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.85rem;
}

.page-about .about-ops li {
  display: flex;
  align-items: baseline;
  gap: 0.8rem;
  padding: 0.85rem 1rem;
  background: rgba(7, 26, 46, 0.5);
  border-left: 3px solid var(--line-cyan);
}

.page-about .about-ops__num {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.55rem;
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-ops__label {
  font-size: 0.9rem;
  line-height: 1.65;
  color: var(--text-soft);
}

/* ---------- 赛季沿革 ---------- */

.page-about .about-seasons {
  margin-top: 1.75rem;
}

.page-about .about-seasons .timeline__body h3 {
  margin: 0 0 0.35rem;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1.05rem;
  color: var(--paper-ink);
}

.page-about .about-seasons .timeline__body p {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.85;
  color: #4a535e;
}

.page-about .about-seasons__figure {
  margin: 1.85rem 0 0;
  aspect-ratio: 5 / 3;
  overflow: hidden;
  border-radius: var(--radius);
}

/* ---------- 合作与准则 ---------- */

.page-about .about-quote {
  margin: 1.75rem 0 0;
  padding: 0.35rem 0 0.35rem 1.15rem;
  border-left: 3px solid var(--bronze);
}

.page-about .about-quote p {
  margin: 0;
  max-width: 48ch;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.05rem, 2.6vw, 1.35rem);
  line-height: 1.7;
  color: var(--paper);
}

.page-about .about-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.75rem;
}

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

/* ---------- 响应式 ---------- */

@media (min-width: 560px) {
  .page-about .about-chapter__side {
    writing-mode: horizontal-tb;
  }

  .page-about .about-lines {
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  }

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

@media (min-width: 760px) {
  .page-about .about-chapter {
    grid-template-columns: 58px minmax(0, 1fr);
    gap: 2rem;
  }

  .page-about .about-chapter__side {
    writing-mode: vertical-rl;
    letter-spacing: 0.3em;
    border-left: 0;
    padding-left: 0;
    padding-top: 0.4rem;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: 76px minmax(0, 1fr);
    gap: 2.5rem;
  }

  .page-about .about-hero__vlabel {
    display: block;
  }
}

@media (min-width: 1000px) {
  .page-about .about-body {
    grid-template-columns: 96px minmax(0, 1fr);
    gap: 3rem;
    align-items: start;
  }

  .page-about .about-rail {
    display: block;
    position: sticky;
    top: 7rem;
    align-self: start;
  }

  .page-about .about-rail__title {
    margin: 0 0 1.25rem 0;
    padding-left: 0.35rem;
    writing-mode: vertical-rl;
    font-family: var(--font-mono);
    font-size: 0.7rem;
    letter-spacing: 0.36em;
    color: var(--dust);
  }

  .page-about .about-rail__list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: 0.65rem;
    border-left: 1px solid var(--line);
  }

  .page-about .about-rail__link {
    display: block;
    margin-left: -1px;
    padding: 0.15rem 0 0.15rem 0.7rem;
    border-left: 2px solid transparent;
    font-size: 0.8rem;
    line-height: 1.5;
    color: var(--text-dim);
    text-decoration: none;
    transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
  }

  .page-about .about-rail__link:hover {
    color: var(--cyan);
    border-left-color: var(--cyan);
  }

  .page-about .about-rail__link:focus-visible {
    outline: 2px solid var(--cyan);
    outline-offset: 3px;
    color: var(--cyan);
  }

  .page-about .about-rail__link[aria-current="true"] {
    color: var(--green);
    border-left-color: var(--green);
  }

  .page-about .about-chapter {
    grid-template-columns: 66px minmax(0, 1fr);
    gap: 2.5rem;
  }
}

@media (min-width: 1180px) {
  .page-about .about-ops {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 1rem;
  }

  .page-about .about-ops li {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}