.page-about {
  --about-line: rgba(143, 163, 184, 0.22);
  --about-edge: rgba(24, 224, 232, 0.3);
  --about-shift: 0px;
  background-color: var(--c-deep);
  color: var(--c-mist);
}

.page-about .section {
  padding-block: clamp(48px, 7vw, 104px);
}

.page-about p {
  max-width: var(--text-max);
  line-height: 1.75;
  color: rgba(244, 248, 251, 0.78);
}

.page-about h2 {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 3.6vw, 2.6rem);
  font-weight: 900;
  letter-spacing: -0.03em;
  line-height: 1.12;
  margin: 0 0 clamp(14px, 2vw, 20px);
  color: #ffffff;
}

.page-about h3 {
  font-family: var(--font-display);
  font-size: clamp(1.15rem, 2.3vw, 1.55rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.3;
  margin: 0 0 0.7rem;
  color: #ffffff;
}

/* ---------- 首屏框景 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(20px, 4vw, 44px) 0;
  background:
    radial-gradient(120% 90% at 12% 0%, rgba(24, 224, 232, 0.14), transparent 62%),
    radial-gradient(90% 70% at 100% 18%, rgba(198, 255, 61, 0.08), transparent 70%);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -20% -10% auto auto;
  width: 70vw;
  height: 70vw;
  background: repeating-linear-gradient(108deg, rgba(24, 224, 232, 0.1) 0 1px, transparent 1px 44px);
  opacity: 0.55;
  pointer-events: none;
}

.page-about .about-crumb {
  position: relative;
  margin-bottom: clamp(16px, 2.4vw, 26px);
}

.page-about .breadcrumb {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.04em;
  color: var(--c-slate);
}

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

.page-about .breadcrumb a:hover {
  color: var(--c-ice);
}

.page-about .about-frame {
  position: relative;
  isolation: isolate;
  border: 1px solid var(--about-edge);
  border-radius: var(--radius-frame);
  padding: clamp(22px, 4.4vw, 64px);
  background: linear-gradient(155deg, rgba(11, 30, 56, 0.96) 0%, rgba(6, 18, 37, 0.88) 68%);
  box-shadow: 0 40px 90px -50px rgba(0, 0, 0, 0.95);
}

.page-about .about-frame::before,
.page-about .about-frame::after {
  content: "";
  position: absolute;
  width: 18px;
  height: 18px;
  border: 1px solid var(--c-cyan);
  opacity: 0.85;
}

.page-about .about-frame::before {
  top: -1px;
  left: -1px;
  border-right: 0;
  border-bottom: 0;
  border-top-left-radius: var(--radius-frame);
}

.page-about .about-frame::after {
  right: -1px;
  bottom: -1px;
  border-left: 0;
  border-top: 0;
  border-bottom-right-radius: var(--radius-frame);
}

.page-about .about-frame__tag {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  color: var(--c-cyan);
  border: 1px solid rgba(24, 224, 232, 0.35);
  border-radius: var(--radius-pill);
  padding: 0.4rem 0.85rem;
  margin-bottom: clamp(16px, 2.4vw, 28px);
}

.page-about .about-hero h1 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.1rem, 6.2vw, 4.4rem);
  line-height: 1.04;
  letter-spacing: -0.04em;
  margin: 0 0 clamp(16px, 2.2vw, 26px);
  color: #ffffff;
}

.page-about .about-hero .lede {
  font-family: var(--font-editorial);
  font-size: clamp(1rem, 1.7vw, 1.32rem);
  line-height: 1.75;
  color: var(--c-ice);
  max-width: 48ch;
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px 20px;
  margin-block: clamp(22px, 3vw, 34px) clamp(20px, 3vw, 30px);
  padding-top: clamp(16px, 2.4vw, 26px);
  border-top: 1px solid var(--about-line);
}

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

.page-about .about-hero__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 3.4vw, 2.1rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--c-lime);
  line-height: 1.1;
}

.page-about .about-hero__cap {
  display: block;
  margin-top: 0.3rem;
  font-size: 0.82rem;
  color: var(--c-slate);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 14px;
}

/* 首屏数据条 */
.page-about .databar {
  margin-top: clamp(28px, 5vw, 56px);
  border-block: 1px solid var(--about-line);
}

.page-about .databar__track span {
  padding-right: 2.6rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  color: var(--c-slate);
  white-space: nowrap;
}

/* ---------- 通用分栏 ---------- */
.page-about .about-split {
  display: grid;
  gap: clamp(24px, 4vw, 56px);
  align-items: center;
}

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

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

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

/* ---------- 起点 ---------- */
.page-about .about-origin .eyebrow {
  color: var(--c-cyan);
}

/* ---------- 发展线 ---------- */
.page-about .about-band {
  background:
    linear-gradient(180deg, rgba(11, 30, 56, 0.92), rgba(6, 18, 37, 0.98)),
    repeating-linear-gradient(96deg, rgba(24, 224, 232, 0.06) 0 1px, transparent 1px 72px);
  border-block: 1px solid var(--about-line);
}

.page-about .about-band__intro {
  max-width: 56ch;
  color: rgba(168, 247, 245, 0.78);
}

.page-about .about-index {
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .about-index ol {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-index a {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.48rem 0.95rem;
  border: 1px solid var(--about-line);
  border-radius: var(--radius-pill);
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: var(--c-slate);
  text-decoration: none;
  transition: color 180ms var(--ease), border-color 180ms var(--ease), background-color 180ms var(--ease);
}

.page-about .about-index a span {
  color: var(--c-cyan);
}

.page-about .about-index a:hover {
  color: var(--c-mist);
  border-color: var(--about-edge);
  background-color: rgba(24, 224, 232, 0.08);
}

.page-about .about-index a:focus-visible {
  outline: 2px solid var(--c-lime);
  outline-offset: 3px;
}

.page-about .about-stages {
  list-style: none;
  margin: clamp(26px, 4vw, 46px) 0 0;
  padding: 0;
}

.page-about .about-stage {
  position: relative;
  display: grid;
  gap: clamp(10px, 1.6vw, 26px);
  padding-block: clamp(22px, 3vw, 40px);
  padding-inline: 4px;
  border-top: 1px solid var(--about-line);
  scroll-margin-top: 96px;
}

.page-about .about-stage:nth-child(1) {
  --about-accent: var(--c-cyan);
}

.page-about .about-stage:nth-child(2) {
  --about-accent: var(--c-lime);
}

.page-about .about-stage:nth-child(3) {
  --about-accent: var(--c-magenta);
}

.page-about .about-stage:nth-child(4) {
  --about-accent: var(--c-ice);
}

.page-about .about-stage__tag {
  display: flex;
  align-items: baseline;
  gap: 0.65rem;
  min-width: 0;
}

.page-about .about-stage__no {
  font-family: var(--font-mono);
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  font-weight: 700;
  line-height: 1;
  color: var(--about-accent, var(--c-cyan));
}

.page-about .about-stage__phase {
  font-family: var(--font-editorial);
  font-size: 0.92rem;
  color: var(--c-slate);
}

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

.page-about .about-stage__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 1rem 0 0;
  padding: 0;
}

.page-about .about-stage__facts li {
  font-family: var(--font-mono);
  font-size: 0.73rem;
  letter-spacing: 0.02em;
  padding: 0.32rem 0.72rem;
  border: 1px solid var(--about-line);
  border-radius: var(--radius-pill);
  color: var(--c-ice);
}

/* ---------- 内容方法 ---------- */
.page-about .about-roster {
  display: grid;
  gap: clamp(16px, 2.2vw, 26px);
  list-style: none;
  margin: clamp(26px, 4vw, 44px) 0 0;
  padding: 0;
}

.page-about .about-roster li {
  min-width: 0;
  padding-top: 14px;
  border-top: 2px solid var(--about-edge);
}

.page-about .about-roster__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.9rem, 4.4vw, 2.7rem);
  font-weight: 700;
  line-height: 1;
  color: var(--c-cyan);
}

.page-about .about-roster__role {
  display: block;
  margin: 0.35rem 0 0.6rem;
  font-family: var(--font-editorial);
  font-size: 1rem;
  color: var(--c-mist);
}

.page-about .about-roster p {
  font-size: 0.94rem;
}

.page-about .about-cadence {
  margin-top: clamp(28px, 4vw, 46px);
  padding: clamp(18px, 3vw, 30px);
  border: 1px solid var(--about-line);
  border-radius: clamp(16px, 2.4vw, 26px);
  background: rgba(11, 30, 56, 0.6);
}

.page-about .about-cadence ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-cadence li {
  display: grid;
  gap: 4px;
  font-size: 0.94rem;
  color: rgba(244, 248, 251, 0.8);
  padding-left: 14px;
  border-left: 2px solid rgba(24, 224, 232, 0.35);
}

.page-about .about-cadence__key {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.1em;
  color: var(--c-lime);
}

/* ---------- 峰值保障 ---------- */
.page-about .about-peak {
  background:
    radial-gradient(80% 120% at 88% 0%, rgba(198, 255, 61, 0.1), transparent 62%),
    var(--c-deep);
  border-block: 1px solid var(--about-line);
}

.page-about .about-peak__grid {
  display: grid;
  gap: clamp(24px, 4vw, 52px);
  align-items: start;
}

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

.page-about .about-peak__panel {
  min-width: 0;
  padding: clamp(20px, 3.2vw, 36px);
  border: 1px solid rgba(198, 255, 61, 0.28);
  border-radius: clamp(18px, 2.6vw, 30px);
  background: linear-gradient(160deg, rgba(11, 30, 56, 0.95), rgba(6, 18, 37, 0.9));
}

.page-about .about-peak__label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.14em;
  color: var(--c-slate);
}

.page-about .about-peak__time {
  display: block;
  margin: 0.5rem 0 1rem;
  font-family: var(--font-mono);
  font-size: clamp(1.8rem, 5vw, 2.8rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.1;
  color: var(--c-lime);
}

.page-about .about-peak__points {
  list-style: none;
  margin: 0 0 clamp(18px, 2.6vw, 26px);
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-peak__points li {
  position: relative;
  padding-left: 18px;
  font-size: 0.94rem;
  color: rgba(244, 248, 251, 0.82);
}

.page-about .about-peak__points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--c-cyan);
}

/* ---------- 视觉语言 ---------- */
.page-about .about-visual__head {
  max-width: 62ch;
}

.page-about .about-swatches {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  list-style: none;
  margin: clamp(22px, 3vw, 34px) 0 0;
  padding: 0;
}

.page-about .about-swatch {
  display: flex;
  align-items: flex-end;
  min-height: 96px;
  padding: 12px 14px;
  border-radius: clamp(14px, 2vw, 20px);
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.04em;
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.page-about .about-swatch--deep {
  background: #061225;
  color: var(--c-ice);
}

.page-about .about-swatch--cyan {
  background: var(--c-cyan);
  color: #061225;
}

.page-about .about-swatch--lime {
  background: var(--c-lime);
  color: #061225;
}

.page-about .about-swatch--magenta {
  background: var(--c-magenta);
  color: #061225;
}

.page-about .about-terrain-band {
  margin-top: clamp(26px, 4vw, 46px);
  display: grid;
  gap: clamp(18px, 3vw, 32px);
  align-items: end;
}

.page-about .about-terrain__figure {
  margin: 0;
  min-width: 0;
  border-radius: clamp(18px, 2.6vw, 30px);
  overflow: hidden;
  border: 1px solid var(--about-line);
}

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

.page-about .about-terrain__note {
  min-width: 0;
  color: var(--c-cyan);
}

.page-about .about-terrain__quote {
  font-family: var(--font-editorial);
  font-size: clamp(1rem, 1.8vw, 1.25rem);
  line-height: 1.7;
  color: var(--c-ice);
  margin: 0 0 0.8rem;
}

.page-about .about-terrain__svg {
  display: block;
  width: 100%;
  height: auto;
  color: var(--c-cyan);
  opacity: 0.7;
}

/* ---------- 接下来 ---------- */
.page-about .about-next {
  border-top: 1px solid var(--about-line);
}

.page-about .about-next__inner {
  display: grid;
  gap: clamp(22px, 3.4vw, 40px);
  align-items: start;
}

.page-about .about-next__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 14px;
  align-items: center;
}

.page-about .about-next__link {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--c-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(24, 224, 232, 0.45);
  padding-bottom: 2px;
}

.page-about .about-next__link:hover {
  color: var(--c-lime);
  border-bottom-color: var(--c-lime);
}

.page-about .about-next__link:focus-visible {
  outline: 2px solid var(--c-lime);
  outline-offset: 3px;
}

/* ---------- 断点 ---------- */
@media (min-width: 720px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-swatches {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-terrain-band {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
  }
}

@media (min-width: 880px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.08fr);
  }

  .page-about .about-split--flip .about-split__media {
    order: -1;
  }

  .page-about .about-peak__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
  }

  .page-about .about-roster {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-next__inner {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    align-items: center;
  }

  .page-about .about-stage {
    grid-template-columns: minmax(150px, 230px) minmax(0, 1fr);
    padding-left: calc(clamp(10px, 2vw, 26px) + var(--about-shift));
  }

  .page-about .about-stage:nth-child(2) {
    --about-shift: 28px;
  }

  .page-about .about-stage:nth-child(3) {
    --about-shift: 56px;
  }

  .page-about .about-stage:nth-child(4) {
    --about-shift: 84px;
  }
}

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