.page-about {
  --about-body-width: 44rem;
  --about-rail-width: 14.5rem;
  --about-gap: clamp(1.75rem, 3.5vw, 3.25rem);
  padding-bottom: clamp(3rem, 8vw, 6rem);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(1.75rem, 4vw, 2.5rem) 0 clamp(2.25rem, 5vw, 3.5rem);
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(120% 95% at 8% 0%, rgba(53, 232, 200, .16), transparent 55%),
    radial-gradient(95% 85% at 100% 8%, rgba(43, 31, 88, .9), transparent 62%),
    var(--ink-deep);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(115deg, rgba(255, 255, 255, .03) 0 2px, transparent 2px 16px);
  pointer-events: none;
}

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

.page-about .about-hero .breadcrumbs {
  margin-bottom: clamp(1.25rem, 3vw, 2rem);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(1.5rem, 4vw, 3rem);
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
    align-items: end;
  }
}

.page-about .about-hero__lead .eyebrow {
  margin-bottom: .6rem;
}

.page-about .about-hero__lead .display-xl {
  margin: 0 0 .9rem;
  text-wrap: balance;
}

.page-about .about-hero__lead .lede {
  margin: 0;
  max-width: 38rem;
}

.page-about .about-hero__cta {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
  margin-top: 1.5rem;
}

.page-about .about-fact-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  border: 1px solid var(--glass-line);
  border-radius: var(--radius-lg);
  background: var(--glass-line);
  overflow: hidden;
  box-shadow: var(--shadow-card);
}

.page-about .about-fact {
  display: flex;
  flex-direction: column;
  gap: .4rem;
  padding: 1.05rem 1.1rem 1.15rem;
  background: rgba(7, 13, 34, .82);
  backdrop-filter: blur(10px);
}

.page-about .about-fact__num {
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 3.4vw, 1.95rem);
  line-height: 1;
  color: var(--neon);
  letter-spacing: -.02em;
}

.page-about .about-fact__label {
  font-size: .82rem;
  line-height: 1.6;
  color: var(--mist);
}

/* ---------- 双栏骨架 ---------- */
.page-about .about-layout {
  display: grid;
  gap: var(--about-gap);
  margin-top: clamp(2.25rem, 5vw, 3.75rem);
}

@media (min-width: 1040px) {
  .page-about .about-layout {
    grid-template-columns: var(--about-rail-width) minmax(0, 1fr);
    align-items: start;
  }
}

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

@media (min-width: 1040px) {
  .page-about .about-rail {
    display: block;
    position: sticky;
    top: 6.5rem;
  }
}

.page-about .about-rail__label {
  margin: 0 0 .85rem;
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .2em;
  color: var(--mist);
}

.page-about .about-rail__nav {
  display: flex;
  flex-direction: column;
  gap: .15rem;
}

.page-about .about-rail__item {
  display: grid;
  grid-template-columns: 1.9rem minmax(0, 1fr);
  gap: .55rem;
  align-items: baseline;
  padding: .55rem .7rem;
  border-left: 2px solid var(--line);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--mist);
  font-size: .88rem;
  line-height: 1.5;
  text-decoration: none;
  transition: color .2s ease, border-color .2s ease, background .2s ease;
}

.page-about .about-rail__item:hover,
.page-about .about-rail__item[data-active="true"] {
  color: var(--paper);
  border-left-color: var(--neon);
  background: var(--neon-soft);
}

.page-about .about-rail__num {
  font-family: var(--font-mono);
  font-size: .72rem;
  color: var(--neon);
}

.page-about .about-body {
  min-width: 0;
  max-width: var(--about-body-width);
}

/* ---------- 章节 ---------- */
.page-about .about-chapter {
  padding-block: clamp(2rem, 4.5vw, 3.25rem);
  border-top: 1px solid var(--line);
  scroll-margin-top: 6.5rem;
}

.page-about .about-chapter:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .about-chapter__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 1rem;
  align-items: start;
  margin-bottom: 1.35rem;
}

.page-about .about-chapter__index {
  font-family: var(--font-display);
  font-size: clamp(2.4rem, 6vw, 3.5rem);
  font-weight: 700;
  line-height: .82;
  letter-spacing: -.02em;
  color: transparent;
  -webkit-text-stroke: 1px rgba(53, 232, 200, .55);
}

.page-about .about-chapter__title {
  margin: .15rem 0 0;
  font-family: var(--font-display);
  font-size: clamp(1.3rem, 3vw, 1.75rem);
  font-weight: 700;
  line-height: 1.35;
  letter-spacing: -.01em;
  color: var(--paper);
  text-wrap: balance;
}

.page-about .about-chapter .prose p {
  margin: 0 0 1rem;
  max-width: 40rem;
}

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

/* ---------- 引用卡 ---------- */
.page-about .about-quote {
  margin: 1.6rem 0 0;
  padding: 1.35rem 1.45rem;
  border: 1px solid var(--glass-line);
  border-left: 3px solid var(--neon);
  border-radius: var(--radius-lg);
  background: var(--glass);
  backdrop-filter: blur(12px);
  box-shadow: var(--shadow-card);
}

.page-about .about-quote p {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1rem, 2vw, 1.15rem);
  line-height: 1.75;
  color: var(--paper);
}

/* ---------- 指标行 ---------- */
.page-about .about-metrics {
  list-style: none;
  margin: 1.6rem 0 0;
  padding: 0;
  display: grid;
  gap: .7rem;
}

@media (min-width: 640px) {
  .page-about .about-metrics {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.page-about .about-metrics li {
  display: flex;
  gap: .85rem;
  align-items: baseline;
  padding: .9rem 1rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: rgba(11, 43, 46, .5);
}

.page-about .about-metrics b {
  flex: 0 0 auto;
  min-width: 3.6rem;
  font-family: var(--font-mono);
  font-size: .95rem;
  line-height: 1.4;
  color: var(--neon);
}

.page-about .about-metrics span {
  font-size: .85rem;
  line-height: 1.65;
  color: var(--mist);
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 0 0 1.6rem;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--glass-line);
  border-radius: var(--radius-lg);
  object-fit: cover;
}

.page-about .about-figure .media__caption {
  margin-top: .6rem;
  font-size: .78rem;
  line-height: 1.6;
  color: var(--mist);
}

/* ---------- 赛季周期 ---------- */
.page-about .season-cycle {
  list-style: none;
  margin: 1.6rem 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--line);
  overflow: hidden;
}

@media (min-width: 700px) {
  .page-about .season-cycle {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1040px) {
  .page-about .season-cycle {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .season-cycle__step {
  position: relative;
  padding: 1.1rem 1.1rem 1.3rem 1.25rem;
  background: rgba(7, 13, 34, .9);
}

.page-about .season-cycle__step::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 3px;
  background: var(--neon);
  opacity: .45;
}

.page-about .season-cycle__tag {
  display: block;
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .08em;
  color: var(--neon);
}

.page-about .season-cycle__step h3 {
  margin: .45rem 0 .45rem;
  font-family: var(--font-body);
  font-size: .98rem;
  font-weight: 600;
  line-height: 1.45;
  color: var(--paper);
}

.page-about .season-cycle__step p {
  margin: 0;
  font-size: .83rem;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 实色内容卡 ---------- */
.page-about .about-panel {
  margin-top: 1.6rem;
  padding: 1.35rem 1.4rem 1.5rem;
  border: 1px solid var(--glass-line);
  border-radius: var(--radius-lg);
  background: linear-gradient(180deg, rgba(43, 31, 88, .55), rgba(10, 18, 48, .85));
  box-shadow: var(--shadow-card);
}

.page-about .about-panel__label {
  margin: 0 0 .9rem;
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .2em;
  color: var(--signal-yellow);
}

/* ---------- 通用条目列表 ---------- */
.page-about .about-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: .7rem;
}

.page-about .about-list li {
  position: relative;
  padding-left: 1.15rem;
  font-size: .9rem;
  line-height: 1.75;
  color: var(--paper);
}

.page-about .about-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .72em;
  width: .45rem;
  height: .45rem;
  border-radius: 50%;
  background: var(--neon);
  opacity: .8;
}

.page-about .about-list--archive {
  margin-top: 1.6rem;
  gap: .85rem;
}

.page-about .about-list--archive li {
  padding: .7rem .9rem .7rem 2.1rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: rgba(10, 18, 48, .55);
  font-size: .87rem;
  color: var(--mist);
}

.page-about .about-list--archive li::before {
  left: .9rem;
  top: 1.35em;
  background: var(--signal-yellow);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: 1.6rem;
}

@media (min-width: 760px) {
  .page-about .about-team {
    grid-template-columns: minmax(0, 1fr) minmax(0, 14rem);
    align-items: start;
  }
}

.page-about .about-figure--side {
  margin: 0;
}

/* ---------- 使用场景 ---------- */
.page-about .about-usecases {
  display: grid;
  gap: 1rem;
  margin-top: 1.6rem;
}

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

.page-about .about-usecase {
  display: flex;
  flex-direction: column;
  gap: .6rem;
  padding: 1.25rem 1.2rem 1.35rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: linear-gradient(180deg, rgba(43, 31, 88, .42), rgba(10, 18, 48, .72));
}

.page-about .about-usecase:nth-child(2) {
  background: linear-gradient(180deg, rgba(11, 43, 46, .7), rgba(10, 18, 48, .72));
}

.page-about .about-usecase:nth-child(3) {
  background: linear-gradient(180deg, rgba(94, 22, 48, .5), rgba(10, 18, 48, .72));
}

.page-about .about-usecase__tag {
  margin: 0;
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .16em;
  color: var(--neon);
}

.page-about .about-usecase h3 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 700;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .about-usecase p {
  margin: 0;
  flex: 1 1 auto;
  font-size: .85rem;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .about-usecase__link {
  align-self: flex-start;
  font-size: .82rem;
  color: var(--neon);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 232, 200, .35);
  padding-bottom: .15rem;
  transition: border-color .2s ease, color .2s ease;
}

.page-about .about-usecase__link:hover {
  color: var(--paper);
  border-bottom-color: var(--paper);
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  display: grid;
  gap: 1.25rem;
  margin-top: clamp(2.25rem, 5vw, 3.5rem);
  padding: clamp(1.6rem, 4vw, 2.4rem);
  border: 1px solid var(--glass-line);
  border-radius: var(--radius-xl);
  background:
    radial-gradient(120% 170% at 0% 0%, rgba(53, 232, 200, .18), transparent 58%),
    var(--ink-deep);
  box-shadow: var(--shadow-pop);
  position: relative;
}

.page-about .about-cta::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 3px;
  border-radius: var(--radius-xl) var(--radius-xl) 0 0;
  background: linear-gradient(90deg, var(--neon), rgba(53, 232, 200, 0));
}

@media (min-width: 820px) {
  .page-about .about-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }
}

.page-about .about-cta__title {
  margin: 0 0 .55rem;
  font-family: var(--font-display);
  font-size: clamp(1.15rem, 2.6vw, 1.5rem);
  font-weight: 700;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .about-cta__text {
  margin: 0;
  max-width: 34rem;
  font-size: .9rem;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .7rem;
}

/* ---------- 窄屏微调 ---------- */
@media (max-width: 520px) {
  .page-about .about-chapter__head {
    grid-template-columns: minmax(0, 1fr);
    gap: .35rem;
  }

  .page-about .about-chapter__index {
    font-size: 2.1rem;
  }

  .page-about .about-metrics li {
    flex-direction: column;
    gap: .35rem;
  }

  .page-about .about-metrics b {
    min-width: 0;
  }
}