.page-about {
  --about-tl-line-left: 80px;
  --about-tl-col-year: 56px;
  --about-tl-col-dot: 24px;
  --about-tl-gap: 12px;
  background-color: var(--k1-bg-deep);
  background-image:
    linear-gradient(rgba(224, 234, 245, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(224, 234, 245, 0.045) 1px, transparent 1px);
  background-size: 56px 56px;
  color: var(--k1-text-primary);
  font-family: var(--k1-font-body);
  line-height: 1.75;
  overflow-x: hidden;
}

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

.page-about .k1-breadcrumb {
  padding-top: 32px;
  padding-bottom: 8px;
  position: relative;
  z-index: 1;
}

.page-about .k1-section-index {
  font-family: var(--k1-font-headline);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.16em;
  color: var(--k1-accent-data);
  text-transform: uppercase;
  margin-bottom: 18px;
}

.page-about h2 {
  font-family: var(--k1-font-headline);
  font-size: clamp(34px, 5vw, 56px);
  font-weight: 200;
  line-height: 1.08;
  letter-spacing: -0.01em;
  margin: 0;
  color: var(--k1-text-primary);
  text-transform: uppercase;
}

.page-about h2::after {
  content: "";
  display: block;
  width: 56px;
  height: 3px;
  margin-top: 18px;
  background: linear-gradient(90deg, var(--k1-accent-data), transparent);
}

/* —— 首屏 Hero —— */
.page-about__hero {
  position: relative;
  min-height: 88vh;
  display: flex;
  align-items: flex-end;
  padding: 110px 0 72px;
  overflow: hidden;
}

.page-about__hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background:
    radial-gradient(ellipse at 82% 12%, rgba(122, 92, 255, 0.26) 0%, transparent 46%),
    radial-gradient(ellipse at 10% 90%, rgba(57, 255, 136, 0.10) 0%, transparent 54%);
}

.page-about__hero .k1-container {
  position: relative;
  z-index: 1;
}

.page-about__hero-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
  margin-bottom: 34px;
}

.page-about__hero h1 {
  font-family: var(--k1-font-headline);
  font-size: clamp(46px, 9.5vw, 118px);
  font-weight: 200;
  line-height: 0.98;
  letter-spacing: -0.01em;
  text-transform: uppercase;
  margin: 0 0 30px;
  max-width: 920px;
}

.page-about__hero-lede {
  font-size: 17px;
  color: var(--k1-text-secondary);
  max-width: 560px;
  margin: 0 0 44px;
  line-height: 1.85;
}

.page-about__hero-go {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 13px;
  color: var(--k1-text-secondary);
  letter-spacing: 0.09em;
  text-transform: uppercase;
}

.page-about__hero-arrow {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border: 1px solid var(--k1-accent-data);
  border-radius: 50%;
  color: var(--k1-accent-data);
  font-size: 18px;
  line-height: 1;
}

.page-about__hero-lines {
  position: absolute;
  right: 0;
  bottom: 10%;
  width: 320px;
  height: auto;
  z-index: 1;
  pointer-events: none;
  opacity: 0.85;
}

/* —— 章节目录 —— */
.page-about__toc {
  position: sticky;
  top: var(--k1-header-height);
  z-index: 20;
  background: rgba(11, 30, 58, 0.86);
  backdrop-filter: blur(10px);
  border-top: 1px solid rgba(224, 234, 245, 0.07);
  border-bottom: 1px solid rgba(224, 234, 245, 0.07);
}

.page-about__toc .k1-container {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-top: 10px;
  padding-bottom: 10px;
  scrollbar-width: none;
}

.page-about__toc .k1-container::-webkit-scrollbar {
  display: none;
}

.page-about__toc .k1-toc__link {
  color: var(--k1-text-secondary);
  text-decoration: none;
  font-size: 13px;
  white-space: nowrap;
  padding: 8px 14px;
  border-radius: var(--k1-radius-sm);
  border: 1px solid transparent;
  transition: color var(--k1-transition), border-color var(--k1-transition), background var(--k1-transition);
}

.page-about__toc .k1-toc__link:hover {
  color: var(--k1-text-primary);
  border-color: rgba(224, 234, 245, 0.16);
}

.page-about__toc .k1-toc__link.is-active {
  color: var(--k1-accent-data);
  border-color: rgba(57, 255, 136, 0.35);
  background: rgba(57, 255, 136, 0.06);
}

/* —— 品牌的起点 —— */
.page-about__origin {
  padding: 100px 0 90px;
  position: relative;
}

.page-about__origin-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 52px;
  margin-top: 56px;
  align-items: center;
}

.page-about__origin-copy p {
  font-size: 16px;
  color: var(--k1-text-secondary);
  margin: 0 0 20px;
}

.page-about__origin-copy strong {
  color: var(--k1-accent-data);
  font-weight: 600;
}

.page-about__dropcap::first-letter {
  font-family: var(--k1-font-headline);
  font-size: 64px;
  font-weight: 700;
  color: var(--k1-accent-data);
  float: left;
  line-height: 0.78;
  padding-right: 10px;
  padding-top: 4px;
}

.page-about__origin-figure {
  margin: 0;
  padding: 0;
}

.page-about__origin-figure img {
  width: 100%;
  display: block;
  border-radius: var(--k1-radius-lg);
  border: 1px solid rgba(224, 234, 245, 0.08);
}

.page-about__origin-figure figcaption,
.page-about__stadium-figure figcaption,
.page-about__tech-figure figcaption {
  margin-top: 12px;
  font-size: 12px;
  color: var(--k1-text-secondary);
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

/* —— 重要里程碑 —— */
.page-about__milestones {
  padding: 90px 0 100px;
  background: linear-gradient(180deg, transparent 0%, rgba(26, 58, 102, 0.30) 22%, rgba(26, 58, 102, 0.30) 78%, transparent 100%);
}

.page-about__timeline {
  position: relative;
  padding: 16px 0 8px;
  margin-top: 56px;
}

.page-about__timeline::before {
  content: "";
  position: absolute;
  left: var(--about-tl-line-left);
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--k1-accent-tech) 0%, rgba(122, 92, 255, 0.16) 92%);
  transform: translateX(-50%);
}

.page-about__timeline-item {
  display: grid;
  grid-template-columns: var(--about-tl-col-year) var(--about-tl-col-dot) 1fr;
  gap: var(--about-tl-gap);
  padding: 26px 0;
  position: relative;
}

.page-about__timeline-year {
  font-family: var(--k1-font-headline);
  font-size: 18px;
  font-weight: 600;
  color: var(--k1-text-primary);
  text-align: right;
  line-height: 1.2;
  padding-top: 6px;
}

.page-about__timeline-dot {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--k1-bg-deep);
  border: 4px solid var(--k1-accent-data);
  justify-self: center;
  margin-top: 8px;
  position: relative;
  z-index: 1;
  box-shadow: 0 0 0 4px rgba(57, 255, 136, 0.10);
}

.page-about__timeline-body {
  padding-top: 2px;
}

.page-about__timeline-num {
  font-family: var(--k1-font-headline);
  font-size: 13px;
  color: var(--k1-accent-data);
  letter-spacing: 0.16em;
  font-weight: 700;
  display: inline-block;
  margin-bottom: 4px;
}

.page-about__timeline-body h3 {
  font-family: var(--k1-font-headline);
  font-size: 21px;
  font-weight: 500;
  margin: 0 0 8px;
  line-height: 1.25;
  color: var(--k1-text-primary);
}

.page-about__timeline-body p {
  font-size: 15px;
  color: var(--k1-text-secondary);
  margin: 0;
  max-width: 620px;
}

.page-about__stadium-figure {
  margin: 72px 0 0;
  padding: 0;
}

.page-about__stadium-figure img {
  width: 100%;
  max-height: 420px;
  object-fit: cover;
  border-radius: var(--k1-radius-lg);
  display: block;
  box-shadow: 0 28px 60px -18px rgba(11, 30, 58, 0.85);
}

/* —— 技术底座 —— */
.page-about__tech {
  padding: 100px 0 110px;
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(ellipse at 84% 16%, rgba(122, 92, 255, 0.18) 0%, transparent 48%),
    linear-gradient(135deg, var(--k1-bg-deep) 0%, var(--k1-gradient-bridge) 48%, var(--k1-bg-deep) 100%);
}

.page-about__tech-lede {
  max-width: 720px;
  font-size: 17px;
  color: var(--k1-text-secondary);
  margin: 28px 0 0;
  line-height: 1.85;
}

.page-about__tech-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 52px;
  margin-top: 60px;
}

.page-about__tech-metrics {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 30px 24px;
}

.page-about__metric {
  border-left: 3px solid var(--k1-accent-data);
  padding-left: 14px;
}

.page-about__metric-value {
  font-family: var(--k1-font-headline);
  font-size: clamp(34px, 5vw, 50px);
  font-weight: 700;
  line-height: 1;
  color: var(--k1-text-primary);
  display: block;
}

.page-about__metric-unit {
  font-size: 18px;
  color: var(--k1-accent-data);
  font-weight: 500;
  margin-left: 2px;
}

.page-about__metric-label {
  display: block;
  margin-top: 8px;
  font-size: 12px;
  color: var(--k1-text-secondary);
  letter-spacing: 0.06em;
}

.page-about__tech-figure {
  margin: 0;
  padding: 0;
}

.page-about__tech-figure img {
  width: 100%;
  display: block;
  border-radius: var(--k1-radius-lg);
  border: 1px solid rgba(224, 234, 245, 0.08);
  box-shadow: 0 24px 48px -14px rgba(11, 30, 58, 0.8);
}

.page-about__tech-certs {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 56px;
}

/* —— 愿景与承诺 —— */
.page-about__vision {
  padding: 100px 0 140px;
  position: relative;
}

.page-about__vision-lede {
  max-width: 640px;
  font-size: 18px;
  color: var(--k1-text-secondary);
  margin: 28px 0 0;
}

.page-about__vision-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 22px;
  margin-top: 60px;
}

.page-about__vision-item {
  background: rgba(18, 42, 77, 0.48);
  padding: 32px 26px;
  border-radius: var(--k1-radius-md);
  border-top: 3px solid transparent;
  transition: border-color var(--k1-transition), background var(--k1-transition);
}

.page-about__vision-item:hover {
  border-color: var(--k1-accent-tech);
  background: rgba(18, 42, 77, 0.72);
}

.page-about__vision-index {
  font-family: var(--k1-font-headline);
  font-size: 26px;
  font-weight: 700;
  color: var(--k1-accent-data);
  display: block;
  margin-bottom: 18px;
}

.page-about__vision-item h3 {
  font-family: var(--k1-font-headline);
  font-size: 19px;
  font-weight: 500;
  margin: 0 0 12px;
  color: var(--k1-text-primary);
}

.page-about__vision-item p {
  font-size: 15px;
  color: var(--k1-text-secondary);
  margin: 0;
  line-height: 1.7;
}

.page-about__vision-quote {
  margin: 64px 0 0;
  padding: 36px 30px;
  background: linear-gradient(135deg, rgba(122, 92, 255, 0.12), rgba(18, 42, 77, 0.55));
  border-left: 4px solid var(--k1-accent-tech);
  border-radius: var(--k1-radius-md);
}

.page-about__vision-quote p {
  font-size: 17px;
  line-height: 1.8;
  color: var(--k1-text-primary);
  margin: 0;
}

.page-about__vision-quote cite {
  display: block;
  margin-top: 14px;
  font-size: 14px;
  font-style: normal;
  color: var(--k1-accent-data);
  font-weight: 600;
}

.page-about__vision-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 52px;
}

/* —— 桌面端 —— */
@media (min-width: 768px) {
  .page-about {
    --about-tl-line-left: 134px;
    --about-tl-col-year: 100px;
    --about-tl-col-dot: 28px;
    --about-tl-gap: 20px;
  }

  .page-about .k1-breadcrumb {
    padding-top: 40px;
  }

  .page-about__hero {
    padding: 140px 0 90px;
  }

  .page-about__hero h1 {
    font-size: clamp(64px, 9vw, 118px);
  }

  .page-about__hero-lede {
    font-size: 18px;
    max-width: 600px;
  }

  .page-about__hero-lines {
    width: 420px;
    right: 2%;
    bottom: 8%;
  }

  .page-about__toc .k1-toc__link {
    font-size: 14px;
    padding: 8px 18px;
  }

  .page-about__origin {
    padding: 130px 0 110px;
  }

  .page-about__origin-grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    gap: 80px;
    margin-top: 68px;
  }

  .page-about__origin-copy p {
    font-size: 16.5px;
  }

  .page-about__milestones {
    padding: 120px 0 130px;
  }

  .page-about__timeline-item {
    padding: 34px 0;
  }

  .page-about__timeline-year {
    font-size: 26px;
  }

  .page-about__timeline-dot {
    width: 20px;
    height: 20px;
    margin-top: 10px;
  }

  .page-about__timeline-num {
    font-size: 14px;
  }

  .page-about__timeline-body h3 {
    font-size: 24px;
  }

  .page-about__timeline-body p {
    font-size: 16px;
  }

  .page-about__stadium-figure {
    margin-top: 88px;
  }

  .page-about__stadium-figure img {
    max-height: 480px;
  }

  .page-about__tech {
    padding: 130px 0 140px;
  }

  .page-about__tech-lede {
    font-size: 18px;
  }

  .page-about__tech-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.9fr);
    gap: 80px;
    align-items: center;
    margin-top: 70px;
  }

  .page-about__tech-metrics {
    gap: 38px 28px;
  }

  .page-about__metric-value {
    font-size: clamp(40px, 4.5vw, 54px);
  }

  .page-about__vision {
    padding: 130px 0 170px;
  }

  .page-about__vision-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
    margin-top: 68px;
  }

  .page-about__vision-item {
    padding: 38px 30px;
  }

  .page-about__vision-quote {
    margin-top: 76px;
    padding: 48px 56px;
  }

  .page-about__vision-quote p {
    font-size: 18px;
  }

  .page-about__vision-cta {
    gap: 18px;
    margin-top: 60px;
  }
}

@media (min-width: 1024px) {
  .page-about__origin-grid {
    gap: 100px;
  }

  .page-about__tech-grid {
    gap: 110px;
  }

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