/* ========== 页面专属 CSS：page-about ========== */
.page-about {
  --about-bg-deep: #0A1128;
  --about-bg-dark: #020617;
  --about-bg-steel: #1C2B59;
  --about-neon: #00FF9C;
  --about-gold: #FFD700;
  --about-white: #FFFFFF;
  --about-light: #A8B2D1;
  --about-cool: #D1D5DB;
  --about-display: Impact, "Arial Black", sans-serif;
  --about-body: Inter, "Noto Sans SC", sans-serif;
  --about-editorial: "Source Serif Pro", "Noto Serif SC", serif;
  --about-ease: cubic-bezier(.22, 1, .36, 1);

  position: relative;
  background: var(--about-bg-deep);
  color: var(--about-white);
  line-height: 1.7;
  overflow-x: hidden;
}

/* 面包屑 */
.page-about .breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
  color: var(--about-light);
  font-size: 0.82rem;
  padding: 1.25rem 1.25rem 0;
  letter-spacing: 0.02em;
}
.page-about .breadcrumbs a {
  color: var(--about-light);
  text-decoration: none;
  transition: color 0.3s var(--about-ease);
}
.page-about .breadcrumbs a:hover {
  color: var(--about-neon);
}
.breadcrumbs__sep {
  opacity: 0.5;
}

/* Hero */
.about-hero {
  display: grid;
  gap: 1.5rem;
  padding: 3rem 1.25rem 4rem;
  position: relative;
  background:
    linear-gradient(120deg, transparent 0%, transparent 58%, rgba(0, 255, 156, 0.04) 58%, rgba(0, 255, 156, 0.07) 70%, transparent 70%),
    var(--about-bg-deep);
}
.about-hero::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 0;
  width: 100%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--about-neon), transparent);
  opacity: 0.4;
}
.about-hero__index {
  display: flex;
  align-items: center;
  gap: 1rem;
}
.about-hero__roman {
  font-family: var(--about-display);
  font-size: 3rem;
  line-height: 1;
  color: var(--about-neon);
  opacity: 0.7;
}
.about-hero__label {
  font-family: var(--about-editorial);
  font-size: 1.1rem;
  color: var(--about-light);
  border-left: 2px solid var(--about-neon);
  padding-left: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
}
.about-hero .eyebrow {
  color: var(--about-gold);
  font-size: 0.85rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  margin-bottom: 0.75rem;
}
.about-hero h1 {
  font-family: var(--about-display);
  font-size: clamp(2.2rem, 5vw, 4.2rem);
  line-height: 1.05;
  letter-spacing: 0.01em;
  margin: 0 0 1.5rem;
  text-transform: uppercase;
}
.about-hero .lead {
  font-family: var(--about-editorial);
  font-size: clamp(1.05rem, 2vw, 1.3rem);
  color: var(--about-light);
  max-width: 46rem;
  margin: 0 0 2rem;
}
.about-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem 1.5rem;
  font-size: 0.88rem;
  color: var(--about-cool);
}
.about-hero__meta span {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}
.about-hero__meta span::before {
  content: "";
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--about-neon);
}

/* 通用章节 */
.about-section {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  padding: 4rem 1.25rem;
  border-bottom: 1px solid rgba(168, 178, 209, 0.12);
}
.about-section__index {
  font-family: var(--about-display);
  font-size: 2.6rem;
  line-height: 1;
  color: transparent;
  -webkit-text-stroke: 1px var(--about-neon);
  opacity: 0.6;
  user-select: none;
}
.about-section h2 {
  font-family: var(--about-display);
  font-size: clamp(1.9rem, 3.5vw, 3.2rem);
  line-height: 1.08;
  margin: 0 0 1rem;
  text-transform: uppercase;
}
.about-section__lead {
  font-family: var(--about-editorial);
  font-size: 1.15rem;
  color: var(--about-light);
  max-width: 42rem;
  margin-bottom: 2.5rem;
}

/* 从旧版到V3 */
.about-revolution__grid {
  display: grid;
  gap: 2.5rem;
}
.about-copy p {
  font-size: 1rem;
  color: var(--about-cool);
  margin: 0 0 1.25rem;
  max-width: 46rem;
}
.about-revolution__aside {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.75rem;
}
.about-stat-card {
  background: rgba(28, 43, 89, 0.45);
  border: 1px solid rgba(168, 178, 209, 0.18);
  padding: 1.25rem 0.75rem;
  text-align: center;
  transition: border-color 0.3s var(--about-ease), transform 0.3s var(--about-ease);
}
.about-stat-card:hover {
  border-color: var(--about-neon);
  transform: translateY(-4px);
}
.about-stat-card__num {
  display: block;
  font-family: var(--about-display);
  font-size: 2rem;
  color: var(--about-neon);
  line-height: 1.2;
}
.about-stat-card__label {
  display: block;
  font-size: 0.78rem;
  color: var(--about-light);
  margin-top: 0.25rem;
}

/* 图片容器 */
.about-media {
  padding: 0 1.25rem 3rem;
}
.about-media img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 2px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.35);
}
.about-media--compact {
  padding: 2rem 0 0;
}

/* 时间线 */
.about-timeline {
  list-style: none;
  margin: 0 0 3rem;
  padding: 0;
  position: relative;
}
.about-timeline__item {
  display: grid;
  grid-template-columns: 88px 1fr;
  gap: 1rem;
  padding: 0 0 2rem;
  position: relative;
}
.about-timeline__item:last-child {
  padding-bottom: 0;
}
.about-timeline__item::before {
  content: "";
  position: absolute;
  left: 43px;
  top: 32px;
  bottom: -12px;
  width: 2px;
  background: linear-gradient(180deg, var(--about-neon), rgba(0, 255, 156, 0.1));
  opacity: 0.4;
}
.about-timeline__item:last-child::before {
  display: none;
}
.about-timeline__meta {
  font-family: var(--about-display);
  font-size: 1.4rem;
  color: var(--about-neon);
  text-align: right;
  white-space: nowrap;
}
.about-timeline__meta span {
  font-family: var(--about-body);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--about-white);
  background: var(--about-bg-deep);
  padding: 0.2rem 0.45rem;
  border: 1px solid rgba(0, 255, 156, 0.3);
  border-radius: 2px;
}
.about-timeline__item:first-child .about-timeline__meta {
  position: relative;
}
.about-timeline__item:first-child .about-timeline__meta::after {
  content: "";
  position: absolute;
  top: 34px;
  right: 0;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--about-neon);
  box-shadow: 0 0 12px rgba(0, 255, 156, 0.8);
}
.about-timeline__body {
  background: rgba(28, 43, 89, 0.25);
  border: 1px solid rgba(168, 178, 209, 0.14);
  border-left: 3px solid var(--about-neon);
  padding: 1.25rem 1.25rem 1rem;
  border-radius: 2px;
  transition: transform 0.35s var(--about-ease), background 0.35s var(--about-ease);
}
.about-timeline__body:hover {
  transform: translateX(4px);
  background: rgba(28, 43, 89, 0.45);
}
.about-timeline__body h3 {
  font-family: var(--about-body);
  font-size: 1.05rem;
  font-weight: 700;
  margin: 0 0 0.4rem;
  color: var(--about-white);
}
.about-timeline__body p {
  font-size: 0.9rem;
  color: var(--about-light);
  margin: 0;
}

/* 图表 */
.about-chart-figure {
  margin: 0 0 3rem;
  padding: 1.5rem 1rem;
  background: rgba(2, 6, 23, 0.6);
  border: 1px solid rgba(168, 178, 209, 0.12);
  border-radius: 4px;
}
.about-chart-figure__svg svg {
  width: 100%;
  height: auto;
  display: block;
}
.about-chart-figure figcaption {
  font-size: 0.82rem;
  color: var(--about-light);
  text-align: center;
  margin-top: 1rem;
}

/* 服务理念 */
.about-values {
  display: grid;
  gap: 1rem;
  margin-bottom: 2.5rem;
}
.about-value-card {
  position: relative;
  background: linear-gradient(135deg, rgba(28, 43, 89, 0.5), rgba(2, 6, 23, 0.6));
  border: 1px solid rgba(168, 178, 209, 0.16);
  padding: 1.75rem 1.25rem 1.5rem 1.5rem;
  transition: border-color 0.3s var(--about-ease), box-shadow 0.3s var(--about-ease);
}
.about-value-card:hover {
  border-color: var(--about-neon);
  box-shadow: 0 8px 24px rgba(0, 255, 156, 0.07);
}
.about-value-card__tag {
  position: absolute;
  top: 0;
  right: 0;
  background: var(--about-neon);
  color: var(--about-bg-deep);
  font-family: var(--about-display);
  font-size: 0.95rem;
  padding: 0.25rem 0.9rem;
  border-bottom-left-radius: 2px;
}
.about-value-card:nth-child(3) .about-value-card__tag {
  background: var(--about-gold);
  color: var(--about-bg-deep);
}
.about-value-card h3 {
  font-family: var(--about-display);
  font-size: 1.6rem;
  margin: 0 0 0.5rem;
  color: var(--about-white);
  text-transform: uppercase;
}
.about-value-card p {
  font-size: 0.92rem;
  color: var(--about-light);
  margin: 0;
}
.about-refresh-demo {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 1rem;
  padding: 0.6rem 0.75rem;
  border: 1px solid rgba(0, 255, 156, 0.2);
  border-radius: 2px;
  background: rgba(0, 255, 156, 0.06);
}
.about-refresh-demo__label {
  font-size: 0.78rem;
  color: var(--about-light);
}
.about-refresh-demo__value {
  font-family: var(--about-display);
  font-size: 1.2rem;
  color: var(--about-neon);
  font-variant-numeric: tabular-nums;
}

/* 服务理念视觉 */
.about-service-visual {
  display: grid;
  gap: 1.5rem;
  align-items: center;
}
.about-service-visual img {
  width: 100%;
  height: auto;
  border-radius: 4px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.35);
}
.about-service-visual__text p {
  font-size: 0.96rem;
  color: var(--about-cool);
  margin: 0 0 1rem;
  max-width: 40rem;
}

/* 团队 */
.about-section--team {
  background-image:
    radial-gradient(circle at 85% 20%, rgba(0, 255, 156, 0.05) 0%, transparent 40%),
    linear-gradient(rgba(168, 178, 209, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(168, 178, 209, 0.03) 1px, transparent 1px);
  background-size: auto, 40px 40px, 40px 40px;
}
.about-team__grid {
  display: grid;
  gap: 1rem;
  grid-template-columns: 1fr;
}
.about-team__item {
  border: 1px solid rgba(168, 178, 209, 0.14);
  background: rgba(28, 43, 89, 0.18);
  padding: 1.5rem;
  border-radius: 2px;
  transition: border-color 0.3s var(--about-ease), background 0.3s var(--about-ease);
}
.about-team__item:hover {
  border-color: var(--about-gold);
  background: rgba(28, 43, 89, 0.28);
}
.about-team__item h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin: 0 0 0.5rem;
  color: var(--about-gold);
}
.about-team__item p {
  font-size: 0.9rem;
  color: var(--about-light);
  margin: 0;
}

/* CTA */
.about-cta {
  padding: 5rem 1.25rem;
  background: var(--about-bg-dark);
  position: relative;
  overflow: hidden;
}
.about-cta::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--about-neon), transparent);
}
.about-cta__inner {
  max-width: 780px;
  margin: 0 auto;
  text-align: center;
}
.about-cta__inner .eyebrow {
  color: var(--about-neon);
  font-size: 0.82rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
}
.about-cta__inner h2 {
  font-family: var(--about-display);
  font-size: clamp(1.8rem, 3vw, 2.8rem);
  line-height: 1.1;
  margin: 0.75rem 0 2.25rem;
  text-transform: uppercase;
}
.about-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: center;
}
.page-about .button {
  font-size: 0.9rem;
  padding: 0.75rem 1.5rem;
  border-radius: 2px;
  text-decoration: none;
  display: inline-block;
  transition: all 0.3s var(--about-ease);
}
.page-about .button--primary {
  background: var(--about-neon);
  color: var(--about-bg-deep);
  font-weight: 700;
  border: 1px solid var(--about-neon);
}
.page-about .button--primary:hover {
  background: transparent;
  color: var(--about-neon);
}
.page-about .button--outline {
  background: transparent;
  color: var(--about-white);
  border: 1px solid rgba(168, 178, 209, 0.4);
}
.page-about .button--outline:hover {
  border-color: var(--about-neon);
  color: var(--about-neon);
}

/* 平板与桌面 */
@media (min-width: 768px) {
  .page-about .breadcrumbs {
    padding: 1.5rem 2.5rem 0;
  }
  .about-hero {
    grid-template-columns: 120px 1fr;
    gap: 2.5rem;
    padding: 4.5rem 2.5rem 6rem;
  }
  .about-hero__index {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.6rem;
  }
  .about-hero__roman {
    font-size: 4.5rem;
  }
  .about-hero__label {
    font-size: 1.3rem;
    border-left: none;
    border-top: 2px solid var(--about-neon);
    padding: 0.5rem 0 0;
  }
  .about-hero h1 {
    font-size: clamp(2.6rem, 5vw, 4.4rem);
  }
  .about-hero .lead {
    font-size: clamp(1.15rem, 2vw, 1.4rem);
  }
  .about-section {
    grid-template-columns: 120px 1fr;
    gap: 2.5rem;
    padding: 5.5rem 2.5rem;
  }
  .about-section__index {
    font-size: 4rem;
  }
  .about-revolution__grid {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 0.7fr);
    gap: 3rem;
    align-items: start;
  }
  .about-revolution__aside {
    grid-template-columns: 1fr;
    gap: 1rem;
  }
  .about-stat-card {
    display: flex;
    flex-direction: column;
    justify-content: center;
    text-align: left;
    padding: 1.25rem 1.5rem;
  }
  .about-stat-card__num {
    font-size: 2.4rem;
  }
  .about-media {
    padding: 0 2.5rem 4.5rem;
  }
  .about-media--compact {
    padding: 3rem 0 0;
  }
  .about-timeline__item {
    grid-template-columns: 120px minmax(0, 560px);
    gap: 2rem;
  }
  .about-timeline__item::before {
    left: 59px;
  }
  .about-timeline__meta {
    font-size: 1.6rem;
  }
  .about-values {
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
  }
  .about-service-visual {
    grid-template-columns: 380px 1fr;
    gap: 3rem;
  }
  .about-team__grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 1.25rem;
  }
  .about-cta {
    padding: 6rem 2.5rem;
  }
  .about-cta__links {
    gap: 1rem;
  }
}

/* 宽屏桌面 */
@media (min-width: 1200px) {
  .about-hero {
    padding: 6rem 6vw 7rem;
    grid-template-columns: 140px minmax(0, 1fr);
  }
  .about-hero__roman {
    font-size: 5rem;
  }
  .about-section {
    padding: 7rem 6vw;
    grid-template-columns: 140px minmax(0, 1fr);
  }
  .about-section__index {
    font-size: 4.5rem;
  }
  .about-media {
    padding-left: calc(6vw + 180px);
    padding-right: 6vw;
  }
  .about-media--compact {
    padding-left: 0;
    padding-right: 0;
  }
  .about-values {
    max-width: 960px;
  }
}