.page-about {
  background: var(--hc-bg-deep);
  color: var(--hc-text);
  font-family: var(--hc-font-body);
  overflow-x: hidden;
}

/* ========== Hero ========== */
.page-about .about-hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  background: var(--hc-bg-deep);
  overflow: hidden;
  border-bottom: 1px solid var(--hc-border);
  padding: 120px 0 60px;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(185, 103, 255, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(185, 103, 255, 0.05) 1px, transparent 1px);
  background-size: 48px 48px;
  z-index: 1;
}

.page-about .about-hero-bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.35;
  z-index: 1;
}

.page-about .about-hero-shade {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse at 80% 15%, rgba(185, 103, 255, 0.18) 0%, transparent 55%),
    linear-gradient(100deg, rgba(7, 7, 12, 0.96) 0%, rgba(7, 7, 12, 0.76) 55%, rgba(7, 7, 12, 0.42) 100%);
  z-index: 2;
}

.page-about .about-hero .hc-container {
  position: relative;
  z-index: 3;
}

.page-about .about-hero .hc-breadcrumb {
  margin-bottom: 40px;
}

.page-about .about-hero-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
}

.page-about .about-hero-flag {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 20px;
}

.page-about .about-hero-title {
  margin: 0 0 20px;
  font-family: var(--hc-font-head);
  font-size: clamp(38px, 7vw, 72px);
  font-weight: 700;
  line-height: 1.08;
  letter-spacing: 0.01em;
  color: var(--hc-text);
  text-shadow: 0 0 60px rgba(185, 103, 255, 0.25);
}

.page-about .about-hero-desc {
  max-width: 620px;
  margin: 0 0 28px;
  font-size: clamp(15px, 2vw, 18px);
  line-height: 1.8;
  color: var(--hc-muted);
  border-left: 3px solid var(--hc-accent);
  padding-left: 18px;
}

.page-about .about-hero-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  font-size: 13px;
  color: var(--hc-muted);
  letter-spacing: 0.06em;
}

.page-about .about-hero-meta .hc-mono {
  color: var(--hc-accent-blue);
  text-shadow: 0 0 12px rgba(0, 212, 255, 0.2);
}

.page-about .about-hero-dot {
  color: var(--hc-muted);
  opacity: 0.5;
}

.page-about .about-hero-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
}

.page-about .about-stat {
  background: rgba(19, 19, 32, 0.78);
  border: 1px solid var(--hc-border);
  border-radius: var(--hc-radius);
  padding: 22px 18px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  backdrop-filter: blur(6px);
  transition: border-color var(--hc-transition), transform var(--hc-transition), box-shadow var(--hc-transition);
}

.page-about .about-stat:hover {
  border-color: var(--hc-accent);
  transform: translateY(-3px);
  box-shadow: var(--hc-glow-purple);
}

.page-about .about-stat--primary {
  border-color: rgba(185, 103, 255, 0.45);
  background: linear-gradient(135deg, rgba(31, 31, 61, 0.92), rgba(19, 19, 32, 0.88));
}

.page-about .about-stat-num {
  font-family: var(--hc-font-mono);
  font-size: clamp(32px, 5vw, 46px);
  font-weight: 700;
  line-height: 1;
  color: var(--hc-text);
}

.page-about .about-stat--primary .about-stat-num {
  color: var(--hc-accent);
  text-shadow: var(--hc-glow-purple);
}

.page-about .about-stat-unit {
  font-size: 0.55em;
  color: var(--hc-accent-blue);
  margin-left: 4px;
}

.page-about .about-stat-label {
  font-size: 13px;
  font-weight: 600;
  color: var(--hc-text);
  letter-spacing: 0.03em;
}

.page-about .about-stat-sub {
  font-size: 12px;
  color: var(--hc-muted);
  font-family: var(--hc-font-mono);
  letter-spacing: 0.02em;
}

/* ========== 章节通用 ========== */
.page-about .about-chapter {
  padding: 80px 0;
  border-bottom: 1px solid rgba(185, 103, 255, 0.08);
  position: relative;
}

.page-about .about-chapter-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
}

.page-about .about-chapter-side {
  position: relative;
}

.page-about .about-chapter-num {
  display: block;
  font-family: var(--hc-font-head);
  font-size: clamp(64px, 12vw, 140px);
  font-weight: 700;
  line-height: 0.9;
  color: transparent;
  -webkit-text-stroke: 1.5px rgba(185, 103, 255, 0.55);
  text-shadow: 0 0 48px rgba(185, 103, 255, 0.12);
  user-select: none;
}

.page-about .about-chapter-label {
  display: block;
  margin-top: 8px;
  font-family: var(--hc-font-mono);
  font-size: 13px;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--hc-accent-blue);
}

.page-about .about-chapter-message {
  margin-top: 22px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--hc-muted);
  border-left: 2px solid rgba(185, 103, 255, 0.35);
  padding-left: 12px;
}

.page-about .about-chapter-main .hc-kicker {
  margin-bottom: 6px;
}

.page-about .about-chapter-main h2 {
  margin: 0 0 16px;
  font-family: var(--hc-font-head);
  font-size: clamp(28px, 4.5vw, 42px);
  font-weight: 700;
  line-height: 1.15;
  color: var(--hc-text);
}

.page-about .about-chapter-lead {
  margin: 0 0 28px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--hc-muted);
  max-width: 720px;
}

/* ========== 01 从归档到中心 ========== */
.page-about .about-origin {
  background: var(--hc-bg-deep);
}

.page-about .about-origin-bento {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about .about-origin-card {
  background: var(--hc-bg-surface);
  border: 1px solid var(--hc-border);
  border-radius: var(--hc-radius);
  padding: 26px 22px;
  transition: border-color var(--hc-transition), transform var(--hc-transition), box-shadow var(--hc-transition);
}

.page-about .about-origin-card:hover {
  border-color: rgba(185, 103, 255, 0.55);
  transform: translateY(-3px);
  box-shadow: var(--hc-glow-purple);
}

.page-about .about-origin-card h3 {
  margin: 10px 0 8px;
  font-size: 18px;
  font-weight: 700;
  color: var(--hc-text);
}

.page-about .about-origin-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--hc-muted);
}

.page-about .about-origin-card--wide {
  background: linear-gradient(135deg, rgba(31, 31, 61, 0.72), rgba(19, 19, 32, 0.9));
  border-left: 3px solid var(--hc-accent);
}

/* ========== 02 关键里程碑 ========== */
.page-about .about-milestones {
  background: linear-gradient(180deg, var(--hc-bg-deep) 0%, #0d0d1a 100%);
}

.page-about .about-timeline-wrap {
  position: relative;
  padding-left: 30px;
}

.page-about .about-timeline-line {
  position: absolute;
  left: 10px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--hc-accent), var(--hc-accent-blue), transparent);
  opacity: 0.4;
}

.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.page-about .about-timeline-item {
  position: relative;
  display: flex;
  gap: 18px;
}

.page-about .about-timeline-marker {
  flex: 0 0 34px;
  width: 34px;
  height: 34px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--hc-font-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--hc-text);
  background: var(--hc-bg-raised);
  border: 1px solid var(--hc-accent);
  border-radius: 8px;
  transform: translateX(-29px);
  z-index: 2;
  box-shadow: 0 0 18px rgba(185, 103, 255, 0.2);
}

.page-about .about-timeline-card {
  flex: 1;
  background: var(--hc-bg-surface);
  border: 1px solid var(--hc-border);
  border-radius: var(--hc-radius);
  padding: 20px 20px 22px;
  transition: border-color var(--hc-transition), box-shadow var(--hc-transition), transform var(--hc-transition);
}

.page-about .about-timeline-card:hover {
  border-color: rgba(0, 212, 255, 0.5);
  box-shadow: var(--hc-glow-blue);
  transform: translateX(3px);
}

.page-about .about-timeline-card h3 {
  margin: 9px 0 7px;
  font-size: 17px;
  font-weight: 700;
  color: var(--hc-text);
}

.page-about .about-timeline-card p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--hc-muted);
}

.page-about .about-milestone-media {
  margin-top: 32px;
  position: relative;
  border-radius: var(--hc-radius);
  overflow: hidden;
  border: 1px solid var(--hc-border);
  background: var(--hc-bg-surface);
}

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

.page-about .about-milestone-caption {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 18px;
  background: var(--hc-bg-raised);
  font-size: 13px;
  color: var(--hc-muted);
}

.page-about .about-milestone-caption .hc-mono {
  color: var(--hc-accent);
}

/* ========== 03 技术保障 ========== */
.page-about .about-tech {
  background: var(--hc-bg-deep);
}

.page-about .about-tech-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about .about-tech-card {
  background: var(--hc-bg-surface);
  border: 1px solid var(--hc-border);
  border-radius: var(--hc-radius);
  padding: 24px 22px;
  position: relative;
  overflow: hidden;
  transition: border-color var(--hc-transition), box-shadow var(--hc-transition), transform var(--hc-transition);
}

.page-about .about-tech-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 3px;
  height: 100%;
  background: linear-gradient(180deg, var(--hc-accent), var(--hc-accent-blue));
  opacity: 0;
  transition: opacity var(--hc-transition);
}

.page-about .about-tech-card:hover {
  border-color: rgba(185, 103, 255, 0.5);
  box-shadow: var(--hc-glow-purple);
  transform: translateY(-3px);
}

.page-about .about-tech-card:hover::before {
  opacity: 1;
}

.page-about .about-tech-symbol {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  font-size: 16px;
  color: var(--hc-accent);
  border: 1px solid rgba(185, 103, 255, 0.35);
  border-radius: 8px;
  margin-bottom: 14px;
  background: rgba(185, 103, 255, 0.08);
}

.page-about .about-tech-card h3 {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 700;
  color: var(--hc-text);
}

.page-about .about-tech-card p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--hc-muted);
}

.page-about .about-tech-media {
  margin-top: 28px;
  border: 1px solid var(--hc-border);
  border-radius: var(--hc-radius);
  overflow: hidden;
  background: var(--hc-bg-surface);
}

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

.page-about .about-tech-caption {
  padding: 14px 18px;
  font-size: 13px;
  color: var(--hc-muted);
  background: var(--hc-bg-raised);
  border-top: 1px solid var(--hc-border);
}

.page-about .about-tech-caption .hc-mono {
  color: var(--hc-accent-blue);
}

/* ========== 04 信任与认可 ========== */
.page-about .about-trust {
  background: linear-gradient(180deg, var(--hc-bg-deep) 0%, #0d0d1a 100%);
}

.page-about .about-trust-box {
  border-radius: var(--hc-radius);
  padding: 32px 28px;
  margin-bottom: 20px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  border: 1px solid rgba(185, 103, 255, 0.4);
  background: linear-gradient(135deg, rgba(31, 31, 61, 0.9), rgba(19, 19, 32, 0.94));
  box-shadow: var(--hc-shadow);
}

.page-about .about-trust-bignum {
  font-family: var(--hc-font-head);
  font-size: clamp(52px, 8vw, 88px);
  font-weight: 700;
  line-height: 1;
  color: var(--hc-accent);
  text-shadow: 0 0 44px rgba(185, 103, 255, 0.35);
}

.page-about .about-trust-bignum-unit {
  font-size: 0.4em;
  color: var(--hc-accent-blue);
  margin-left: 4px;
}

.page-about .about-trust-copy h3 {
  margin: 0 0 6px;
  font-size: 19px;
  color: var(--hc-text);
}

.page-about .about-trust-copy p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--hc-muted);
}

.page-about .about-trust-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-bottom: 28px;
}

.page-about .about-trust-card {
  background: var(--hc-bg-surface);
  border: 1px solid var(--hc-border);
  border-radius: var(--hc-radius);
  padding: 22px 20px;
  transition: border-color var(--hc-transition), box-shadow var(--hc-transition), transform var(--hc-transition);
}

.page-about .about-trust-card:hover {
  border-color: rgba(255, 107, 53, 0.5);
  box-shadow: var(--hc-glow-purple);
  transform: translateY(-3px);
}

.page-about .about-trust-card h3 {
  margin: 12px 0 7px;
  font-size: 16px;
  font-weight: 700;
  color: var(--hc-text);
}

.page-about .about-trust-card p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--hc-muted);
}

.page-about .about-trust-links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  padding-top: 8px;
}

.page-about .about-trust-links-label {
  font-size: 13px;
  color: var(--hc-muted);
  font-family: var(--hc-font-mono);
  letter-spacing: 0.06em;
  margin-right: 6px;
}

.page-about .about-trust-links .hc-btn {
  border-radius: 999px;
}

/* ========== 平板端 ========== */
@media (min-width: 768px) {
  .page-about .about-hero {
    padding: 140px 0 80px;
  }

  .page-about .about-hero-layout {
    grid-template-columns: 1.15fr 0.85fr;
    gap: 48px;
    align-items: center;
  }

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

  .page-about .about-origin-card--wide {
    grid-column: span 2;
  }

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

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

  .page-about .about-trust-box {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }

  .page-about .about-trust-bignum {
    flex: 0 0 auto;
  }

  .page-about .about-trust-copy {
    max-width: 480px;
  }
}

/* ========== 桌面端 ========== */
@media (min-width: 1024px) {
  .page-about .about-chapter {
    padding: 100px 0;
  }

  .page-about .about-chapter-grid {
    grid-template-columns: 240px 1fr;
    gap: 60px;
  }

  .page-about .about-chapter-side {
    position: sticky;
    top: 120px;
    align-self: start;
  }

  .page-about .about-chapter-num {
    font-size: 136px;
  }

  .page-about .about-chapter-message {
    font-size: 14px;
  }

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

  .page-about .about-origin-card {
    padding: 30px 28px;
  }

  .page-about .about-timeline-wrap {
    padding-left: 44px;
  }

  .page-about .about-timeline-line {
    left: 14px;
  }

  .page-about .about-timeline-marker {
    width: 36px;
    height: 36px;
    transform: translateX(-44px);
  }

  .page-about .about-timeline-card {
    padding: 24px 26px;
  }

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

  .page-about .about-trust-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}