/* ===== 页面作用域：.page-about ===== */
.page-about {
  --about-accent-soft: rgba(198, 255, 0, 0.14);
  --about-blue-soft: rgba(0, 229, 255, 0.12);
  --about-grid: rgba(255, 255, 255, 0.045);
  position: relative;
  overflow: hidden;
  background: var(--color-bg);
}

.page-about::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    linear-gradient(var(--about-grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--about-grid) 1px, transparent 1px);
  background-size: 48px 48px;
}

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

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

.page-about__wrap {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 1.25rem;
}

.page-about .eyebrow {
  display: inline-block;
  margin-bottom: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--color-accent);
}

.page-about__h2 {
  display: inline-block;
  position: relative;
  margin: 0.5rem 0 2rem;
  padding-bottom: 0.5rem;
  font-family: var(--font-headline);
  font-size: clamp(1.9rem, 4vw, 2.6rem);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

.page-about__h2::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 2.75rem;
  height: 3px;
  background: var(--gradient-accent);
}

/* HERO */
.page-about__hero {
  position: relative;
  isolation: isolate;
  padding: 6rem 0 3rem;
  border-bottom: 1px solid var(--color-line);
}

.page-about__hero::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 1px;
  background: linear-gradient(90deg, transparent 10%, var(--color-accent) 40%, var(--color-accent-blue) 80%, transparent);
}

.page-about__hero::after {
  content: "赛场";
  position: absolute;
  z-index: -1;
  right: -1rem;
  top: 2rem;
  font-family: var(--font-headline);
  font-weight: 900;
  line-height: 1;
  font-size: clamp(8rem, 18vw, 18rem);
  color: rgba(255, 255, 255, 0.02);
  -webkit-text-stroke: 1px rgba(198, 255, 0, 0.09);
  letter-spacing: -0.02em;
  pointer-events: none;
}

.page-about__hero-inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 1.25rem;
}

.page-about__hero-band {
  margin-top: 2.5rem;
}

.page-about__hero-main {
  max-width: 880px;
}

.page-about__hero-title {
  margin: 0 0 1.5rem;
  font-family: var(--font-headline);
  font-size: clamp(2.6rem, 7vw, 5.5rem);
  font-weight: 900;
  line-height: 1.02;
  letter-spacing: 0.01em;
}

.page-about__hero-title-part {
  display: block;
}

.page-about__hero-title-highlight {
  display: inline-block;
  transform: skewX(var(--skew));
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.page-about__hero-lead {
  max-width: 48em;
  margin: 0 0 1.75rem;
  font-size: 1.05rem;
  line-height: 1.85;
  color: var(--color-text-sub);
}

.page-about__hero-aside {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--color-line);
}

.page-about__hero-aside::before {
  content: "";
  width: 100%;
  height: 1px;
  margin-bottom: 1rem;
  background: var(--gradient-accent);
  opacity: 0.55;
}

.page-about__hero-aside-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.3em;
  color: var(--color-text-dim);
}

.page-about__hero-aside-value {
  margin-top: 0.35rem;
  font-family: var(--font-mono);
  font-size: 1rem;
  letter-spacing: 0.12em;
  color: var(--color-accent);
}

.page-about__hero-svg {
  width: 100%;
  max-width: 240px;
  height: auto;
  margin-top: 1.5rem;
  opacity: 0.8;
}

.page-about__hero-anchors {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 2.5rem;
}

.page-about__hero-anchor {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--color-line);
  background: rgba(20, 20, 20, 0.6);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-decoration: none;
  color: var(--color-text-sub);
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-about__hero-anchor:hover,
.page-about__hero-anchor:focus-visible {
  border-color: var(--color-accent);
  background: var(--about-accent-soft);
  color: var(--color-accent);
}

/* 通用区块 */
.page-about__section {
  padding: 4.5rem 0;
  border-bottom: 1px solid var(--color-line);
}

.page-about__section-head {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-bottom: 2.5rem;
}

.page-about__section-head-note {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-text-dim);
}

/* STORY */
.page-about__story {
  background: linear-gradient(135deg, rgba(198, 255, 0, 0.02) 0%, rgba(0, 229, 255, 0.01) 100%);
}

.page-about__story-grid {
  display: grid;
  gap: 2.5rem;
  align-items: center;
}

.page-about__text {
  margin: 0 0 1.25rem;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--color-text-sub);
}

.page-about__text a {
  color: var(--color-accent-blue);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

.page-about__text a:hover {
  color: var(--color-accent);
}

.page-about__quote {
  position: relative;
  margin: 2rem 0 0;
  padding: 1.5rem 1.75rem;
  border-left: 3px solid var(--color-accent);
  background: linear-gradient(90deg, var(--about-accent-soft), transparent 70%);
}

.page-about__quote p {
  margin: 0 0 0.25rem;
  font-family: var(--font-headline);
  font-size: 1.35rem;
  font-weight: 700;
  line-height: 1.5;
  color: var(--color-text);
  transform: skewX(var(--skew));
}

.page-about__quote cite {
  font-family: var(--font-mono);
  font-style: normal;
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  color: var(--color-text-dim);
}

.page-about__story-figure {
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--color-line);
  background: var(--color-panel);
}

.page-about__story-img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

/* TIMELINE */
.page-about__timeline-figure {
  margin: 0 0 2.5rem;
  overflow: hidden;
  border: 1px solid var(--color-line);
  background: var(--color-panel);
}

.page-about__timeline-figure-img {
  width: 100%;
}

.page-about__timeline-list {
  position: relative;
  margin: 0;
  padding: 0 0 0 1.25rem;
  list-style: none;
}

.page-about__timeline-list::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(to bottom, var(--color-accent), var(--color-accent-blue));
  opacity: 0.4;
}

.page-about__timeline-item {
  position: relative;
  padding: 0 0 2.25rem 2rem;
}

.page-about__timeline-item:last-child {
  padding-bottom: 0;
}

.page-about__timeline-dot {
  position: absolute;
  left: -1.95rem;
  top: 4px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--color-accent);
  box-shadow: 0 0 0 4px rgba(198, 255, 0, 0.16);
}

.page-about__version-label {
  display: block;
  margin-bottom: 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  color: var(--color-accent-blue);
}

.page-about__timeline-card {
  padding: 1.25rem 1.25rem 1.4rem;
  border: 1px solid var(--color-line);
  border-left: 3px solid var(--color-accent);
  background: var(--color-panel);
  transition: border-color 0.2s var(--ease), box-shadow 0.2s var(--ease), transform 0.2s var(--ease);
}

.page-about__timeline-item:hover .page-about__timeline-card,
.page-about__timeline-item:focus-within .page-about__timeline-card {
  border-color: var(--color-accent-blue);
  border-left-color: var(--color-accent);
  box-shadow: var(--shadow-panel);
  transform: translateY(-2px);
}

.page-about__timeline-card-title {
  margin: 0 0 0.5rem;
  font-family: var(--font-headline);
  font-size: 1.05rem;
  font-weight: 700;
  line-height: 1.4;
  color: var(--color-text);
}

.page-about__timeline-card-text {
  margin: 0;
  font-size: 0.875rem;
  line-height: 1.7;
  color: var(--color-text-sub);
}

/* DATA */
.page-about__data {
  background: linear-gradient(180deg, rgba(0, 229, 255, 0.035) 0%, transparent 45%);
}

.page-about__data-grid {
  display: grid;
  gap: 2.5rem;
  align-items: start;
}

.page-about__data-copy {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.page-about__data-figure {
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--color-line);
  background: var(--color-panel);
}

.page-about__data-img {
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: cover;
}

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

.page-about__metric {
  padding: 1.25rem 1.1rem 1.35rem;
  border: 1px solid var(--color-line);
  background: var(--color-panel);
  transition: border-color 0.2s var(--ease), transform 0.2s var(--ease);
}

.page-about__metric:hover,
.page-about__metric:focus-visible {
  border-color: var(--color-accent);
  transform: translateY(-2px);
}

.page-about__metric dt,
.page-about__metric dd {
  margin: 0;
  padding: 0;
}

.page-about__metric-label {
  margin: 0 0 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--color-text-dim);
}

.page-about__metric-value {
  margin: 0 0 0.6rem;
}

.page-about__metric-num {
  font-family: var(--font-mono);
  font-size: clamp(1.9rem, 4vw, 2.5rem);
  font-weight: 700;
  line-height: 1.1;
  color: var(--color-accent);
}

.page-about__metric-unit {
  margin-left: 0.15rem;
  font-family: var(--font-mono);
  font-size: 1.25rem;
  color: var(--color-silver);
}

.page-about__metric-cap {
  font-size: 0.78rem;
  line-height: 1.55;
  color: var(--color-text-sub);
}

/* TECH */
.page-about__tech-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

.page-about__tech-card {
  position: relative;
  overflow: hidden;
  padding: 2rem 1.75rem;
  border: 1px solid var(--color-line);
  background: var(--color-panel);
  transition: border-color 0.2s var(--ease), transform 0.2s var(--ease);
}

.page-about__tech-card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 3px;
  height: 100%;
  background: var(--gradient-accent);
  opacity: 0;
  transition: opacity 0.2s var(--ease);
}

.page-about__tech-card:hover,
.page-about__tech-card:focus-within {
  border-color: var(--color-accent-blue);
  transform: translateY(-3px);
}

.page-about__tech-card:hover::before,
.page-about__tech-card:focus-within::before {
  opacity: 1;
}

.page-about__tech-num {
  display: block;
  margin-bottom: 1rem;
  font-family: var(--font-mono);
  font-size: clamp(2.75rem, 7vw, 4.5rem);
  font-weight: 700;
  line-height: 1;
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  transform: skewX(var(--skew));
}

.page-about__tech-plus {
  display: inline-block;
  margin-left: 0.1em;
  font-size: 0.6em;
  vertical-align: top;
}

.page-about__tech-title {
  margin: 0 0 0.5rem;
  font-family: var(--font-headline);
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--color-text);
}

.page-about__tech-text {
  margin: 0;
  font-size: 0.875rem;
  line-height: 1.7;
  color: var(--color-text-sub);
}

/* AWARDS */
.page-about__awards {
  background: linear-gradient(180deg, transparent, rgba(198, 255, 0, 0.03) 60%);
}

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

.page-about__award-card {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
  align-items: start;
  padding: 2rem 1.75rem;
  border: 1px solid var(--color-line);
  background: var(--color-panel);
  transition: border-color 0.2s var(--ease);
}

.page-about__award-card:hover {
  border-color: var(--color-accent);
}

.page-about__award-year {
  justify-self: start;
  display: inline-block;
  padding: 0.4rem 0.6rem;
  background: var(--color-accent);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  color: var(--color-bg);
}

.page-about__award-year--plain {
  background: var(--color-accent-blue);
  color: var(--color-bg);
}

.page-about__award-title {
  margin: 0 0 0.5rem;
  font-family: var(--font-headline);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-text);
}

.page-about__award-text {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--color-text-sub);
}

.page-about__awards-foot {
  margin-top: 2rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--color-line);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.04em;
  color: var(--color-text-dim);
}

/* NEXT */
.page-about__next {
  padding: 4.5rem 0;
  border-bottom: 1px solid var(--color-line);
  background: var(--color-panel);
}

.page-about__next-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.75rem;
}

.page-about__next-card {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.2rem 1.25rem;
  padding: 1.25rem 1.5rem;
  border: 1px solid var(--color-line);
  background: var(--color-bg);
  text-decoration: none;
  transition: border-color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-about__next-card:hover,
.page-about__next-card:focus-visible {
  border-color: var(--color-accent);
  background: rgba(198, 255, 0, 0.04);
}

.page-about__next-index {
  grid-row: span 2;
  padding-top: 0.2rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  color: var(--color-accent-blue);
}

.page-about__next-title {
  font-family: var(--font-headline);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-text);
}

.page-about__next-desc {
  font-size: 0.8rem;
  line-height: 1.5;
  color: var(--color-text-sub);
}

/* ===== 桌面端适配 ===== */
@media (min-width: 768px) {
  .page-about__wrap,
  .page-about__hero-inner {
    padding: 0 2rem;
  }

  .page-about__hero {
    padding-top: 8rem;
    padding-bottom: 4rem;
  }

  .page-about__hero-band {
    grid-template-columns: 1fr 320px;
    gap: 4rem;
    align-items: end;
    display: grid;
    margin-top: 4rem;
  }

  .page-about__hero-aside {
    margin-top: 0;
    padding-top: 1.25rem;
  }

  .page-about__section {
    padding: 6.5rem 0;
  }

  .page-about__section-head {
    flex-direction: row;
    align-items: flex-end;
    justify-content: space-between;
  }

  .page-about__story-grid {
    grid-template-columns: 1.05fr 0.95fr;
    gap: 4rem;
  }

  .page-about__version-label {
    writing-mode: vertical-rl;
    height: 3.5rem;
    margin-bottom: 1rem;
  }

  .page-about__timeline-list {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    column-gap: 1.5rem;
    padding: 4rem 0 0;
  }

  .page-about__timeline-list::before {
    left: 4%;
    right: 4%;
    top: 38px;
    width: auto;
    height: 2px;
    background: linear-gradient(90deg, var(--color-accent), var(--color-accent-blue));
    opacity: 0.5;
  }

  .page-about__timeline-item {
    padding: 0;
  }

  .page-about__timeline-dot {
    left: calc(50% - 7px);
    top: -32px;
  }

  .page-about__timeline-card {
    height: 100%;
  }

  .page-about__data-grid {
    grid-template-columns: 0.8fr 1.2fr;
    gap: 3.5rem;
  }

  .page-about__metrics {
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
  }

  .page-about__tech-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 1.25rem;
  }

  .page-about__awards-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
  }

  .page-about__award-card {
    grid-template-columns: auto 1fr;
  }

  .page-about__next-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
  }
}

@media (min-width: 1024px) {
  .page-about__tech-grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .page-about__next-grid {
    grid-template-columns: repeat(5, 1fr);
  }

  .page-about__next-card {
    grid-template-columns: 1fr;
    gap: 0.4rem;
    padding: 1.5rem 1.25rem;
  }

  .page-about__next-index {
    grid-row: auto;
  }
}