.page-about {
  --about-glow-green: rgba(0, 255, 136, 0.10);
  --about-glow-orange: rgba(255, 122, 0, 0.10);
  --about-glow-violet: rgba(90, 92, 255, 0.16);
  --about-heading: #EAF6FF;
  --about-node-bg: #0D2030;
  background:
    radial-gradient(900px 480px at 88% -4%, var(--about-glow-violet), transparent 62%),
    linear-gradient(180deg, var(--bg-deep), var(--bg-lift));
  color: var(--cyan);
  font-family: var(--font-body);
  overflow-x: hidden;
}
.page-about .content-shell {
  width: min(100% - 32px, var(--content));
  margin-inline: auto;
}

/* ===== 面包屑 ===== */
.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--gray);
}
.page-about .breadcrumb a {
  color: var(--gray);
  text-decoration: none;
  transition: color 0.2s ease;
}
.page-about .breadcrumb a:hover {
  color: var(--green);
}
.page-about .breadcrumb [aria-hidden="true"] {
  color: rgba(138, 155, 171, 0.5);
}

/* ===== 页首 ===== */
.page-about .about-hero {
  position: relative;
  min-height: 520px;
  display: flex;
  align-items: flex-end;
  isolation: isolate;
  background:
    linear-gradient(180deg, rgba(11, 27, 43, 0.10) 0%, rgba(11, 27, 43, 0.55) 55%, rgba(11, 27, 43, 0.96) 100%);
  border-bottom: 1px solid var(--line);
}
.page-about .about-hero__bg {
  position: absolute;
  inset: 0;
  z-index: -1;
  overflow: hidden;
}
.page-about .about-hero__bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  filter: saturate(1.15) contrast(1.08);
}
.page-about .about-hero__inner {
  padding: 72px 0 48px;
}
.page-about .about-hero__eyebrow {
  margin: 20px 0 0;
  font-family: var(--font-data);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--green);
  text-transform: uppercase;
  display: flex;
  align-items: center;
  gap: 10px;
}
.page-about .about-hero__eyebrow::before {
  content: "";
  width: 26px;
  height: 2px;
  background: var(--green);
  flex-shrink: 0;
}
.page-about .about-hero__title {
  margin: 14px 0 0;
  max-width: 860px;
  font-family: var(--font-head);
  font-size: clamp(34px, 6vw, 58px);
  line-height: 1.15;
  letter-spacing: 0.02em;
  color: var(--about-heading);
}
.page-about .about-hero__lead {
  margin: 18px 0 0;
  max-width: 640px;
  font-size: 16px;
  line-height: 1.75;
  color: var(--gray);
}

/* ===== 通用章节标题 ===== */
.page-about .section-heading {
  max-width: 720px;
  margin-bottom: 40px;
}
.page-about .section-eyebrow {
  margin: 0 0 10px;
  font-family: var(--font-data);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--violet);
  text-transform: uppercase;
}
.page-about .section-heading h2,
.page-about .boundary-copy h2,
.page-about .vision-inner h2 {
  margin: 0;
  font-family: var(--font-head);
  font-size: clamp(26px, 4.4vw, 40px);
  line-height: 1.2;
  color: var(--about-heading);
  letter-spacing: 0.01em;
}
.page-about .section-desc {
  margin: 12px 0 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--gray);
}

/* ===== 发展里程碑 ===== */
.page-about .about-milestones {
  padding: 72px 0 64px;
}
.page-about .milestone-track {
  position: relative;
  max-width: 780px;
}
.page-about .milestone-track::before {
  content: "";
  position: absolute;
  left: 24px;
  top: 58px;
  bottom: 20px;
  width: 2px;
  background: linear-gradient(180deg, var(--green) 0%, var(--violet) 35%, var(--orange) 75%, var(--green) 100%);
  opacity: 0.5;
}
.page-about .milestone-item {
  position: relative;
  padding: 0 0 36px 64px;
}
.page-about .milestone-item:last-child {
  padding-bottom: 0;
}
.page-about .milestone-node {
  position: absolute;
  left: 4px;
  top: 0;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--about-node-bg);
  border: 2px solid var(--green);
  box-shadow: 0 0 0 5px var(--about-glow-green), 0 0 20px var(--about-glow-green);
}
.page-about .milestone-num {
  font-family: var(--font-data);
  font-size: 12px;
  font-weight: 700;
  color: var(--green);
}
.page-about .milestone-item:nth-child(2) .milestone-node {
  border-color: var(--violet);
  box-shadow: 0 0 0 5px var(--about-glow-violet), 0 0 20px var(--about-glow-violet);
}
.page-about .milestone-item:nth-child(2) .milestone-num {
  color: var(--violet);
}
.page-about .milestone-item:nth-child(3) .milestone-node {
  border-color: var(--orange);
  box-shadow: 0 0 0 5px var(--about-glow-orange), 0 0 20px var(--about-glow-orange);
}
.page-about .milestone-item:nth-child(3) .milestone-num {
  color: var(--orange);
}
.page-about .milestone-item:nth-child(4) .milestone-node {
  border-color: var(--green);
}
.page-about .milestone-card {
  background: var(--glass);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px 22px;
  transition: transform 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}
.page-about .milestone-card:hover {
  border-color: rgba(0, 255, 136, 0.35);
  background: rgba(255, 255, 255, 0.08);
  transform: translateX(4px);
}
.page-about .milestone-card h3 {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: 19px;
  color: var(--about-heading);
}
.page-about .milestone-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--gray);
}

/* ===== 两条主路径 ===== */
.page-about .about-paths {
  position: relative;
  padding: 72px 0;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.03), rgba(255, 255, 255, 0) 40%),
    radial-gradient(720px 320px at 10% 80%, var(--about-glow-green), transparent 65%);
  border-block: 1px solid var(--line);
}
.page-about .paths-visual {
  margin: 0 0 40px;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--line);
  box-shadow: 0 18px 48px rgba(0, 0, 0, 0.25);
}
.page-about .paths-visual img {
  display: block;
  width: 100%;
  height: auto;
}
.page-about .paths-grid {
  display: grid;
  gap: 20px;
}
.page-about .path-card {
  position: relative;
  background: var(--glass);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 24px;
  overflow: hidden;
  transition: border-color 0.25s ease, transform 0.25s ease;
}
.page-about .path-card:hover {
  transform: translateY(-3px);
  border-color: rgba(0, 255, 136, 0.35);
}
.page-about .path-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--green);
}
.page-about .path-card--live::before {
  background: var(--orange);
}
.page-about .path-card--live:hover {
  border-color: rgba(255, 122, 0, 0.4);
}
.page-about .path-card__index {
  display: inline-block;
  font-family: var(--font-data);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--bg-deep);
  background: var(--green);
  padding: 3px 8px;
  border-radius: 4px;
}
.page-about .path-card--live .path-card__index {
  background: var(--orange);
}
.page-about .path-card h3 {
  margin: 14px 0 8px;
  font-family: var(--font-head);
  font-size: 22px;
  color: var(--about-heading);
}
.page-about .path-card p {
  margin: 0 0 18px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--gray);
}
.page-about .path-card__link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  font-weight: 500;
  color: var(--green);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s ease;
}
.page-about .path-card__link:hover {
  border-color: var(--green);
}
.page-about .path-card--live .path-card__link {
  color: var(--orange);
}
.page-about .path-card--live .path-card__link:hover {
  border-color: var(--orange);
}

/* ===== 核心原则 ===== */
.page-about .about-principles {
  padding: 72px 0 64px;
}
.page-about .principles-grid {
  display: grid;
  gap: 20px;
}
.page-about .principle-item {
  position: relative;
  padding: 28px 24px;
  border-radius: var(--radius);
  background: var(--glass);
  border: 1px solid var(--line);
  overflow: hidden;
}
.page-about .principle-item::after {
  content: "01";
  position: absolute;
  top: -16px;
  right: 12px;
  font-family: var(--font-data);
  font-weight: 700;
  font-size: 96px;
  line-height: 1;
  color: rgba(255, 255, 255, 0.04);
  pointer-events: none;
}
.page-about .principle-item:nth-child(2)::after {
  content: "02";
}
.page-about .principle-item:nth-child(3)::after {
  content: "03";
}
.page-about .principle-num {
  display: inline-block;
  font-family: var(--font-data);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--green);
  padding: 3px 10px;
  border: 1px solid rgba(0, 255, 136, 0.28);
  border-radius: 999px;
  background: rgba(0, 255, 136, 0.06);
  margin-bottom: 18px;
}
.page-about .principle-item h3 {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-size: 21px;
  color: var(--about-heading);
}
.page-about .principle-item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--gray);
}
.page-about .apple-visual {
  margin-top: 48px;
  display: grid;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: linear-gradient(135deg, rgba(90, 92, 255, 0.12), rgba(0, 255, 136, 0.04));
  overflow: hidden;
}
.page-about .apple-visual img {
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}
.page-about .apple-visual__note {
  padding: 24px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}
.page-about .apple-visual__note h3 {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-size: 21px;
  color: var(--about-heading);
}
.page-about .apple-visual__note p {
  margin: 0 0 18px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--gray);
}
.page-about .apple-visual__link {
  align-self: flex-start;
  font-size: 14px;
  font-weight: 500;
  color: var(--violet);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s ease;
}
.page-about .apple-visual__link:hover {
  border-color: var(--violet);
}

/* ===== 服务边界 ===== */
.page-about .about-boundary {
  position: relative;
  padding: 72px 0;
  background:
    linear-gradient(90deg, rgba(208, 228, 245, 0.045) 1px, transparent 1px),
    linear-gradient(0deg, rgba(208, 228, 245, 0.045) 1px, transparent 1px),
    rgba(255, 255, 255, 0.025);
  background-size: 52px 52px, 52px 52px, auto;
  border-block: 1px solid var(--line);
}
.page-about .boundary-grid {
  display: grid;
  gap: 28px;
}
.page-about .boundary-copy h2 {
  margin: 0 0 18px;
}
.page-about .boundary-copy p {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--gray);
}
.page-about .boundary-copy p:last-of-type {
  margin-bottom: 24px;
}
.page-about .boundary-cta {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 15px;
  font-weight: 600;
  color: var(--green);
  text-decoration: none;
  border-bottom: 2px solid rgba(0, 255, 136, 0.25);
  padding-bottom: 2px;
  transition: border-color 0.2s ease;
}
.page-about .boundary-cta:hover {
  border-color: var(--green);
}
.page-about .boundary-stats {
  background: rgba(8, 22, 32, 0.78);
  border: 1px solid rgba(208, 228, 245, 0.14);
  border-radius: var(--radius);
  padding: 8px 20px;
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.2);
}
.page-about .stat-row {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 15px 0;
  border-bottom: 1px solid var(--line);
}
.page-about .stat-row:last-child {
  border-bottom: 0;
}
.page-about .stat-label {
  font-size: 14px;
  color: var(--gray);
  flex-shrink: 0;
}
.page-about .stat-value {
  font-family: var(--font-data);
  font-size: 15px;
  font-weight: 700;
  color: var(--green);
  text-align: left;
}
.page-about .stat-row:nth-child(3) .stat-value,
.page-about .stat-row:nth-child(5) .stat-value {
  color: var(--orange);
}
.page-about .stat-row:nth-child(4) .stat-value {
  color: var(--violet);
}

/* ===== 品牌愿景 ===== */
.page-about .about-vision {
  padding: 88px 0 96px;
  position: relative;
  background:
    radial-gradient(700px 300px at 50% 0%, var(--about-glow-violet), transparent 70%),
    var(--bg-deep);
}
.page-about .vision-inner {
  max-width: 780px;
  margin-inline: auto;
  text-align: center;
}
.page-about .vision-inner .section-eyebrow {
  display: inline-block;
}
.page-about .vision-lead {
  margin: 16px 0 12px;
  font-family: var(--font-head);
  font-size: clamp(24px, 4vw, 34px);
  line-height: 1.3;
  color: var(--about-heading);
}
.page-about .vision-copy {
  margin: 0 auto;
  max-width: 620px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--gray);
}
.page-about .vision-actions {
  margin-top: 32px;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 14px;
}
.page-about .vision-actions .action-btn {
  text-decoration: none;
}

/* ===== 桌面端布局 ===== */
@media (min-width: 800px) {
  .page-about .content-shell {
    width: min(100% - 48px, var(--content));
  }
  .page-about .about-hero {
    min-height: 640px;
  }
  .page-about .about-hero__inner {
    padding: 96px 0 72px;
  }
  .page-about .about-hero__title {
    margin-top: 18px;
  }
  .page-about .about-hero__lead {
    font-size: 17px;
  }
  .page-about .section-heading {
    margin-bottom: 48px;
  }
  .page-about .about-milestones {
    padding: 96px 0 88px;
  }
  .page-about .milestone-track {
    max-width: 820px;
    margin-left: auto;
    margin-right: 0;
  }
  .page-about .milestone-track::before {
    left: 30px;
  }
  .page-about .milestone-item {
    padding: 0 0 44px 72px;
  }
  .page-about .milestone-node {
    left: 6px;
    width: 48px;
    height: 48px;
  }
  .page-about .milestone-num {
    font-size: 13px;
  }
  .page-about .milestone-card {
    padding: 24px 28px;
  }
  .page-about .milestone-card h3 {
    font-size: 21px;
  }
  .page-about .milestone-card p {
    font-size: 15px;
  }
  .page-about .about-paths {
    padding: 96px 0;
  }
  .page-about .paths-visual {
    border-radius: 20px;
  }
  .page-about .paths-visual img {
    max-height: 520px;
    object-fit: cover;
  }
  .page-about .paths-grid {
    grid-template-columns: 1fr 1fr;
    gap: 24px;
  }
  .page-about .path-card {
    padding: 28px;
  }
  .page-about .path-card::before {
    top: 0;
    left: 0;
    bottom: 0;
    right: auto;
    width: 3px;
    height: auto;
  }
  .page-about .path-card:hover {
    transform: translateY(-4px);
  }
  .page-about .about-principles {
    padding: 96px 0 88px;
  }
  .page-about .principles-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
  }
  .page-about .principle-item {
    padding: 32px 24px;
  }
  .page-about .principle-item:nth-child(2) {
    margin-top: 20px;
  }
  .page-about .apple-visual {
    grid-template-columns: 1fr 1fr;
    margin-top: 68px;
  }
  .page-about .apple-visual img {
    aspect-ratio: auto;
    height: 100%;
    min-height: 320px;
  }
  .page-about .apple-visual__note {
    padding: 36px;
  }
  .page-about .about-boundary {
    padding: 96px 0;
  }
  .page-about .boundary-grid {
    grid-template-columns: 1fr 0.9fr;
    gap: 56px;
    align-items: center;
  }
  .page-about .stat-row {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
  }
  .page-about .stat-value {
    font-size: 17px;
    text-align: right;
  }
  .page-about .about-vision {
    padding: 112px 0 120px;
  }
  .page-about .vision-actions {
    gap: 16px;
  }
}