.page-about {
  --about-rail-width: 180px;
  --about-cut: 28px;
  --flame-rgb: 255, 77, 0;
  --deep-rgb: 11, 15, 26;
  --rock-rgb: 17, 24, 39;
  --electric-rgb: 0, 229, 255;
  --neon-rgb: 138, 43, 226;
  background: var(--color-deep);
  color: var(--color-cloud);
  overflow-x: hidden;
}

/* ---------- Hero ---------- */
.page-about .about-hero {
  position: relative;
  padding: 44px 20px 120px;
  background:
    radial-gradient(circle at 84% 10%, rgba(var(--flame-rgb), 0.22) 0%, transparent 44%),
    radial-gradient(circle at 8% 90%, rgba(var(--electric-rgb), 0.10) 0%, transparent 36%),
    linear-gradient(160deg, var(--color-rock) 0%, var(--color-deep) 82%);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 48px), 0 100%);
}

.page-about .about-hero::before {
  content: '';
  position: absolute;
  inset: 0 0 56px;
  background-image:
    repeating-linear-gradient(90deg, transparent 0 79px, rgba(245, 245, 245, 0.05) 79px 80px),
    repeating-linear-gradient(0deg, transparent 0 79px, rgba(245, 245, 245, 0.05) 79px 80px);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  max-width: 1120px;
  margin: 0 auto;
}

.page-about .about-breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 36px;
  font-size: 0.82rem;
  color: var(--color-smoke);
  position: relative;
  z-index: 1;
}

.page-about .about-breadcrumb a {
  color: var(--color-smoke);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s, border-color 0.2s;
}

.page-about .about-breadcrumb a:hover {
  color: var(--color-flame);
  border-color: var(--color-flame);
}

.page-about .about-breadcrumb__sep {
  color: var(--color-line-strong);
}

.page-about .about-hero__meta {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 24px;
}

.page-about .about-hero__index {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.16em;
  color: var(--color-smoke);
  border: 1px solid var(--color-line-strong);
  padding: 6px 12px;
}

.page-about .about-hero h1 {
  position: relative;
  z-index: 1;
  max-width: 13em;
  margin: 0 0 20px;
  font-size: clamp(1.8rem, 4.6vw, 3.4rem);
  font-weight: 900;
  line-height: 1.22;
  letter-spacing: 0.01em;
  text-wrap: balance;
}

.page-about .about-hero__lead {
  position: relative;
  z-index: 1;
  max-width: 640px;
  margin: 0 0 36px;
  padding-left: 18px;
  border-left: 3px solid var(--color-flame);
  color: var(--color-smoke);
  font-size: 1rem;
  line-height: 1.85;
}

.page-about .about-hero__brief {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  gap: 1px;
  background: var(--color-line-strong);
  border: 1px solid var(--color-line-strong);
}

.page-about .about-hero__brief-item {
  flex: 1 1 40%;
  min-width: 110px;
  padding: 16px 18px;
  background: var(--color-deep);
}

.page-about .about-hero__brief-item strong {
  display: block;
  margin-top: 4px;
  font-family: var(--font-mono);
  font-size: 1.5rem;
  color: var(--color-cloud);
}

.page-about .about-hero__slashes {
  position: absolute;
  right: 0;
  bottom: 64px;
  width: 42%;
  height: 6px;
  background: linear-gradient(90deg, var(--color-hot), var(--color-flame));
  clip-path: polygon(0 0, calc(100% - 16px) 0, 100% 100%, 16px 100%);
  opacity: 0.85;
}

/* ---------- 主布局 ---------- */
.page-about .about-layout {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 20px;
}

/* ---------- 年份轨道 ---------- */
.page-about .about-rail {
  margin: 0 -20px;
  padding: 0 20px 8px;
  overflow-x: auto;
  scrollbar-width: none;
}

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

.page-about .about-rail__inner {
  min-width: 360px;
}

.page-about .about-rail__label {
  display: block;
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--color-smoke);
}

.page-about .about-rail__nav {
  display: flex;
  gap: 8px;
  width: max-content;
}

.page-about .about-rail__link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 64px;
  height: 40px;
  padding: 0 14px;
  font-family: var(--font-mono);
  font-size: 0.95rem;
  color: var(--color-smoke);
  text-decoration: none;
  background: var(--color-rock);
  border: 1px solid var(--color-line);
  transition: color 0.2s, border-color 0.2s, background 0.2s;
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus {
  color: var(--color-flame);
  border-color: var(--color-flame);
}

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

/* ---------- 内容区通用 ---------- */
.page-about .about-content {
  padding-top: 16px;
}

.page-about .about-mission,
.page-about .about-milestones,
.page-about .about-data,
.page-about .about-team,
.page-about .about-honors {
  margin-top: 72px;
  scroll-margin-top: 80px;
}

/* ---------- 品牌使命 ---------- */
.page-about .about-mission__frame {
  position: relative;
  padding: 32px 24px 36px;
  background:
    linear-gradient(135deg, rgba(var(--flame-rgb), 0.08) 0%, transparent 48%),
    var(--color-rock);
  border: 1px solid var(--color-line-strong);
  border-top: 3px solid var(--color-flame);
}

.page-about .about-mission__slogan {
  display: flex;
  gap: 14px;
  margin: 24px 0;
  padding: 18px 20px;
  background: rgba(var(--flame-rgb), 0.10);
  border-left: 3px solid var(--color-flame);
}

.page-about .about-mission__slogan p {
  margin: 0;
  font-size: 1.15rem;
  font-weight: 700;
  line-height: 1.5;
}

.page-about .about-mission__body > p {
  margin: 0 0 14px;
  color: var(--color-smoke);
  font-size: 0.98rem;
  line-height: 1.8;
}

.page-about .about-mission__link {
  display: inline-block;
  margin-top: 8px;
  color: var(--color-electric);
  text-decoration: none;
  font-weight: 600;
  border-bottom: 1px solid rgba(var(--electric-rgb), 0.3);
  transition: color 0.2s, border-color 0.2s;
}

.page-about .about-mission__link:hover {
  color: var(--color-flame);
  border-color: var(--color-flame);
}

/* ---------- 发展历程 ---------- */
.page-about .about-milestones__intro {
  margin: 18px 0 0;
  max-width: 720px;
  color: var(--color-smoke);
  font-size: 0.95rem;
  line-height: 1.75;
}

.page-about .about-milestones__intro p {
  margin: 0;
}

.page-about .about-milestones__timeline {
  margin-top: 28px;
}

.page-about .about-milestone {
  position: relative;
  margin-top: 16px;
  padding: 26px 22px 24px;
  background: var(--color-rock);
  border: 1px solid var(--color-line);
  border-left: 3px solid var(--color-flame);
  clip-path: polygon(0 0, calc(100% - var(--about-cut)) 0, 100% var(--about-cut), 100% 100%, 0 100%);
  scroll-margin-top: 100px;
  transition: border-color 0.25s, background 0.25s;
}

.page-about .about-milestone:target {
  border-left-color: var(--color-electric);
  background: linear-gradient(135deg, rgba(var(--electric-rgb), 0.06), var(--color-rock) 60%);
}

.page-about .about-milestone__year {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin-bottom: 12px;
}

.page-about .about-milestone__year .data-label {
  font-size: 0.72rem;
  color: var(--color-smoke);
}

.page-about .about-milestone__year strong {
  font-family: var(--font-mono);
  font-size: 2rem;
  line-height: 1;
  color: var(--color-flame);
}

.page-about .about-milestone:target .about-milestone__year strong {
  color: var(--color-electric);
}

.page-about .about-milestone__body h3 {
  margin: 0 0 10px;
  font-size: 1.2rem;
  font-weight: 800;
}

.page-about .about-milestone__body > p {
  margin: 0;
  color: var(--color-smoke);
  font-size: 0.94rem;
  line-height: 1.75;
}

.page-about .about-milestone__detail {
  margin-top: 16px;
  padding-top: 14px;
  border-top: 1px solid var(--color-line);
}

.page-about .about-milestone__detail summary {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  color: var(--color-electric);
}

.page-about .about-milestone__detail summary::-webkit-details-marker {
  display: none;
}

.page-about .about-milestone__detail summary::before {
  content: '▸';
  transition: transform 0.2s;
}

.page-about .about-milestone__detail[open] summary::before {
  transform: rotate(90deg);
}

.page-about .about-milestone__detail p {
  margin: 12px 0 0;
  color: var(--color-smoke);
  font-size: 0.9rem;
  line-height: 1.75;
}

.page-about .about-milestone__detail a {
  color: var(--color-electric);
  text-decoration: none;
  border-bottom: 1px solid rgba(var(--electric-rgb), 0.3);
}

/* ---------- 数据能力 ---------- */
.page-about .about-data {
  position: relative;
}

.page-about .about-data__lead {
  max-width: 720px;
  margin: 0 0 28px;
  color: var(--color-smoke);
  font-size: 1rem;
  line-height: 1.8;
}

.page-about .about-data__stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.page-about .about-stat {
  position: relative;
  padding: 20px 18px;
  background: var(--color-rock);
  border: 1px solid var(--color-line);
}

.page-about .about-stat::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 44px;
  height: 3px;
  background: var(--color-flame);
}

.page-about .about-stat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 2rem;
  font-weight: 800;
  line-height: 1;
  color: var(--color-cloud);
}

.page-about .about-stat__unit {
  font-size: 0.95rem;
  color: var(--color-flame);
  margin-left: 4px;
}

.page-about .about-stat__label {
  display: block;
  margin-top: 10px;
  font-size: 0.86rem;
  color: var(--color-smoke);
}

.page-about .about-data__features {
  display: grid;
  gap: 10px;
  margin-top: 28px;
}

.page-about .about-data__feature {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 14px 16px;
  background: rgba(var(--flame-rgb), 0.05);
  border: 1px solid var(--color-line);
  border-left: 2px solid var(--color-electric);
}

.page-about .about-data__feature-num {
  flex-shrink: 0;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--color-electric);
  line-height: 1.6;
}

.page-about .about-data__feature p {
  margin: 0;
  color: var(--color-cloud);
  font-size: 0.92rem;
  line-height: 1.7;
}

.page-about .about-data__visual {
  position: relative;
  margin-top: 32px;
  padding: 10px;
  background: var(--color-rock);
  border: 1px solid var(--color-line);
}

.page-about .about-data__visual img {
  display: block;
  width: 100%;
  height: auto;
  max-height: 520px;
  object-fit: cover;
}

.page-about .about-data__visual-caption {
  position: absolute;
  top: 18px;
  right: 18px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--color-cloud);
  background: rgba(var(--deep-rgb), 0.88);
  padding: 6px 10px;
  border-left: 2px solid var(--color-flame);
}

/* ---------- 团队文化 ---------- */
.page-about .about-team__grid {
  display: grid;
  gap: 24px;
  margin-top: 28px;
}

.page-about .about-team__image {
  position: relative;
  padding: 8px;
  background: var(--color-rock);
  border: 1px solid var(--color-line);
}

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

.page-about .about-team__image-caption {
  position: absolute;
  left: 18px;
  bottom: 18px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  color: var(--color-cloud);
  background: rgba(var(--deep-rgb), 0.9);
  padding: 6px 10px;
  border-left: 2px solid var(--color-flame);
}

.page-about .about-team__lead {
  margin: 0 0 20px;
  color: var(--color-cloud);
  font-size: 1.05rem;
  font-weight: 600;
  line-height: 1.8;
}

.page-about .about-team__points {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-team__points li {
  position: relative;
  padding: 16px 0 16px 34px;
  border-bottom: 1px solid var(--color-line);
}

.page-about .about-team__points li::before {
  content: '';
  position: absolute;
  left: 8px;
  top: 24px;
  width: 10px;
  height: 10px;
  background: transparent;
  border: 2px solid var(--color-electric);
  transform: rotate(45deg);
}

.page-about .about-team__points strong {
  display: block;
  margin-bottom: 6px;
  color: var(--color-cloud);
  font-size: 1rem;
  font-weight: 800;
}

.page-about .about-team__points span {
  color: var(--color-smoke);
  font-size: 0.9rem;
  line-height: 1.7;
}

/* ---------- 荣誉与资质 ---------- */
.page-about .about-honors {
  position: relative;
  padding: 36px 24px;
  background:
    linear-gradient(135deg, rgba(var(--neon-rgb), 0.08) 0%, transparent 55%),
    rgba(var(--rock-rgb), 0.6);
  border: 1px solid var(--color-line);
}

.page-about .about-honors__grid {
  display: grid;
  gap: 0;
  margin-top: 28px;
}

.page-about .about-honors__item {
  display: flex;
  gap: 16px;
  padding: 18px 0;
  border-bottom: 1px solid var(--color-line);
}

.page-about .about-honors__item:last-child {
  border-bottom: none;
}

.page-about .about-honors__badge {
  flex-shrink: 0;
  width: 38px;
  height: 38px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--color-neon-light);
  border: 1px solid rgba(var(--neon-rgb), 0.5);
}

.page-about .about-honors__item h3 {
  margin: 0 0 6px;
  font-size: 1rem;
  font-weight: 800;
}

.page-about .about-honors__item p {
  margin: 0;
  color: var(--color-smoke);
  font-size: 0.9rem;
  line-height: 1.7;
}

.page-about .about-honors__item a {
  color: var(--color-electric);
  text-decoration: none;
  border-bottom: 1px solid rgba(var(--electric-rgb), 0.3);
}

.page-about .about-honors__bottom {
  display: grid;
  gap: 20px;
  align-items: center;
  margin-top: 28px;
}

.page-about .about-honors__visual {
  padding: 8px;
  background: var(--color-rock);
  border: 1px solid var(--color-line);
}

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

.page-about .about-honors__note {
  margin: 0;
  padding-top: 16px;
  border-top: 2px solid var(--color-neon);
  color: var(--color-smoke);
  font-size: 0.9rem;
  line-height: 1.7;
}

/* ---------- 结尾 CTA ---------- */
.page-about .about-close {
  position: relative;
  margin-top: 80px;
  padding: 56px 24px;
  text-align: center;
  background:
    linear-gradient(145deg, rgba(var(--flame-rgb), 0.14) 0%, transparent 55%),
    var(--color-rock);
  border: 1px solid var(--color-line);
  clip-path: polygon(0 26px, 26px 0, 100% 0, 100% 100%, 0 100%);
}

.page-about .about-close h2 {
  margin: 0 0 12px;
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 900;
}

.page-about .about-close p {
  max-width: 520px;
  margin: 0 auto 30px;
  color: var(--color-smoke);
  font-size: 0.98rem;
  line-height: 1.8;
}

.page-about .about-close__actions {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 平板与桌面 ---------- */
@media (min-width: 720px) {
  .page-about .about-hero__brief-item {
    flex: 1;
  }

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

  .page-about .about-data__features {
    grid-template-columns: repeat(2, 1fr);
  }

  .page-about .about-team__grid {
    grid-template-columns: 40% 1fr;
    align-items: start;
  }

  .page-about .about-milestone {
    padding: 30px 32px 28px;
  }
}

@media (min-width: 1000px) {
  .page-about .about-hero {
    padding: 64px 48px 140px;
  }

  .page-about .about-layout {
    display: grid;
    grid-template-columns: var(--about-rail-width) minmax(0, 1fr);
    gap: 56px;
  }

  .page-about .about-rail {
    margin: 0;
    padding: 0;
    overflow: visible;
  }

  .page-about .about-rail__inner {
    position: sticky;
    top: 24px;
    min-width: 0;
    padding: 8px 0 0;
  }

  .page-about .about-rail__nav {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    width: auto;
  }

  .page-about .about-rail__link {
    position: relative;
    justify-content: flex-start;
    min-width: 0;
    height: auto;
    padding: 12px 8px 12px 0;
    background: transparent;
    border: none;
    border-bottom: 1px solid var(--color-line);
    font-size: 1.02rem;
  }

  .page-about .about-rail__link::before {
    content: '';
    position: absolute;
    left: -4px;
    top: 50%;
    width: 9px;
    height: 9px;
    background: var(--color-deep);
    border: 2px solid var(--color-smoke);
    transform: translateY(-50%) rotate(45deg);
    transition: background 0.2s, border-color 0.2s;
  }

  .page-about .about-rail__link:hover::before,
  .page-about .about-rail__link:focus::before {
    background: var(--color-flame);
    border-color: var(--color-flame);
  }

  .page-about .about-rail__ruler {
    display: block;
    position: relative;
    height: 1px;
    margin-top: 28px;
    background: var(--color-line-strong);
  }

  .page-about .about-rail__ruler::after {
    content: '';
    position: absolute;
    top: -2px;
    left: 0;
    width: 56px;
    height: 5px;
    background: linear-gradient(90deg, var(--color-hot), var(--color-flame));
  }

  .page-about .about-content {
    padding-top: 8px;
  }

  .page-about .about-mission,
  .page-about .about-milestones,
  .page-about .about-data,
  .page-about .about-team,
  .page-about .about-honors {
    margin-top: 96px;
  }

  .page-about .about-mission__frame {
    padding: 44px 44px 48px;
  }

  .page-about .about-milestone {
    padding: 32px 36px 30px;
  }

  .page-about .about-honors__bottom {
    grid-template-columns: 1fr 1fr;
  }
}