.page-about {
  --about-side-w: 220px;
  --about-chapter-space: 2.8rem;
  background: var(--color-space);
  padding-bottom: 5rem;
}

/* 面包屑 */
.page-about .breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  padding: 1rem 0 0.5rem;
  font-family: var(--font-body);
  font-size: 0.78rem;
  color: rgba(245, 245, 220, 0.6);
}

.page-about .breadcrumb a {
  color: rgba(245, 245, 220, 0.75);
  text-decoration: none;
  transition: color 0.2s ease;
}

.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  color: var(--color-gold);
}

/* Hero */
.page-about .about-hero {
  position: relative;
  padding: 2.5rem 0 3rem;
  background:
    linear-gradient(rgba(245, 245, 220, 0.032) 1px, transparent 1px),
    linear-gradient(90deg, rgba(245, 245, 220, 0.032) 1px, transparent 1px);
  background-size: 32px 32px;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse at 82% 24%, rgba(155, 89, 182, 0.16), transparent 60%),
    radial-gradient(ellipse at 16% 78%, rgba(212, 175, 55, 0.1), transparent 52%);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  gap: 1.8rem;
}

.page-about .about-hero__content {
  max-width: 560px;
}

.page-about .section-kicker {
  color: var(--color-gold);
  letter-spacing: 0.16em;
  font-family: var(--font-body);
  font-size: 0.78rem;
  margin-bottom: 0.6rem;
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
}

.page-about .section-kicker::after {
  content: "";
  width: 34px;
  height: 1px;
  background: linear-gradient(90deg, var(--color-gold), transparent);
}

.page-about .about-hero h1 {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 3.6vw, 2.5rem);
  font-weight: 900;
  line-height: 1.22;
  color: var(--color-white);
  margin: 0 0 1rem;
  letter-spacing: 0.01em;
}

.page-about .about-hero__lead {
  font-family: var(--font-body);
  font-size: 0.92rem;
  line-height: 1.75;
  color: var(--color-cream);
  margin: 0 0 1.25rem;
}

.page-about .about-hero__meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.55rem;
  margin-bottom: 1.5rem;
}

.page-about .about-hero__status-text {
  font-family: var(--font-body);
  font-size: 0.82rem;
  color: var(--color-cream);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
}

.page-about .about-hero__figure {
  margin: 0;
  border-radius: var(--radius-card);
  border: 1px solid var(--border-line);
  overflow: hidden;
  background: var(--color-space-deep);
  box-shadow: var(--shadow-1);
}

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

/* 档案主布局 */
.page-about .about-layout {
  display: grid;
  gap: 2rem;
  padding-top: 1rem;
}

/* 侧边旁注 */
.page-about .about-sidebar__inner {
  background: rgba(8, 18, 38, 0.82);
  border: 1px solid var(--border-line);
  border-radius: var(--radius-card);
  padding: 1.25rem;
  transition: border-color 0.25s ease, box-shadow 0.25s ease;
}

.page-about .about-sidebar__inner:hover {
  border-color: rgba(212, 175, 55, 0.28);
  box-shadow: 0 0 24px rgba(212, 175, 55, 0.05);
}

.page-about .about-sidebar__label {
  font-family: var(--font-display);
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--color-gold);
  letter-spacing: 0.08em;
  margin: 0 0 0.8rem;
}

.page-about .about-sidebar__list {
  margin: 0 0 1rem;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0.35rem;
}

.page-about .about-sidebar__list a {
  display: block;
  font-family: var(--font-body);
  font-size: 0.88rem;
  color: var(--color-cream);
  text-decoration: none;
  padding: 0.4rem 0.6rem;
  border-radius: 8px;
  border-left: 2px solid transparent;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.page-about .about-sidebar__list a:hover {
  background: rgba(212, 175, 55, 0.08);
  color: var(--color-gold);
  border-left-color: var(--color-gold);
}

.page-about .about-sidebar__list a:focus-visible {
  outline: 2px solid var(--color-gold);
  outline-offset: 2px;
}

.page-about .about-sidebar__note {
  border-top: 1px solid var(--border-line);
  border-bottom: 1px solid var(--border-line);
  padding: 0.85rem 0;
  margin: 0 auto;
  font-family: var(--font-body);
  font-size: 0.78rem;
  line-height: 1.6;
  color: rgba(245, 245, 220, 0.62);
}

.page-about .about-sidebar__note-title {
  color: var(--color-gold);
  font-weight: 700;
  margin-bottom: 0.25rem;
  font-size: 0.84rem;
}

.page-about .about-sidebar__link {
  display: inline-block;
  margin-top: 0.75rem;
  font-family: var(--font-body);
  font-size: 0.78rem;
  color: var(--color-neon);
  text-decoration: none;
  transition: color 0.2s ease;
}

.page-about .about-sidebar__link:hover,
.page-about .about-sidebar__link:focus-visible {
  color: var(--color-gold);
}

/* 正文容器 */
.page-about .about-content {
  min-width: 0;
  display: grid;
  gap: var(--about-chapter-space);
}

/* 章节 */
.page-about .about-chapter {
  scroll-margin-top: calc(var(--header-h) + var(--header-top) + 1.2rem);
}

.page-about .about-chapter__head {
  display: grid;
  grid-template-columns: 2.5rem 1fr;
  gap: 0.7rem;
  border-bottom: 1px solid var(--border-line);
  padding-bottom: 0.9rem;
  margin-bottom: 1.3rem;
}

.page-about .about-chapter__num {
  font-family: var(--font-body);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-gold);
  line-height: 1;
  padding-top: 0.25rem;
}

.page-about .about-chapter__head h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.55rem;
  font-weight: 900;
  color: var(--color-white);
  line-height: 1.2;
}

.page-about .about-chapter__lead {
  margin: 0.4rem 0 0;
  font-family: var(--font-body);
  font-size: 0.86rem;
  line-height: 1.6;
  color: rgba(212, 175, 55, 0.85);
}

.page-about .about-chapter__side-note {
  display: none;
}

.page-about .about-chapter__body {
  font-family: var(--font-body);
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--color-cream);
  display: grid;
  gap: 1.05rem;
}

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

.page-about .about-chapter__body strong {
  color: var(--color-white);
}

.page-about .about-chapter__quote {
  margin: 0;
  padding: 0.9rem 1.1rem;
  border-left: 3px solid var(--color-gold);
  background: rgba(212, 175, 55, 0.06);
  border-radius: 0 12px 12px 0;
}

.page-about .about-chapter__quote p {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.02rem;
  color: var(--color-white);
  line-height: 1.6;
}

/* 内联链接 */
.page-about .about-inline-link {
  color: var(--color-lake);
  text-decoration: none;
  border-bottom: 1px solid rgba(27, 188, 156, 0.4);
  transition: color 0.2s ease, border-color 0.2s ease;
}

.page-about .about-inline-link:hover,
.page-about .about-inline-link:focus-visible {
  color: var(--color-gold);
  border-color: var(--color-gold);
}

/* 同步机制图片 */
.page-about .about-sync-figure {
  margin: 0;
  border-radius: var(--radius-card);
  overflow: hidden;
  border: 1px solid var(--border-line);
  background: var(--color-space-deep);
}

.page-about .about-sync-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-height: 340px;
  object-fit: cover;
}

/* 功能清单 */
.page-about .about-feature-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.55rem;
}

.page-about .about-feature-list li {
  position: relative;
  padding-left: 1.1rem;
  font-size: 0.85rem;
  line-height: 1.6;
}

.page-about .about-feature-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 6px;
  height: 6px;
  background: var(--color-lake);
  border-radius: 50%;
}

.page-about .about-feature-list strong {
  color: var(--color-gold);
}

/* 同步保障卡片 */
.page-about .about-note-card {
  display: flex;
  align-items: flex-start;
  gap: 0.8rem;
  background: rgba(27, 60, 116, 0.24);
  border: 1px solid rgba(212, 175, 55, 0.24);
  border-radius: var(--radius-card);
  padding: 1rem;
  font-size: 0.84rem;
  line-height: 1.6;
  color: var(--color-cream);
}

.page-about .about-note-card p {
  margin: 0;
}

/* 时间线 */
.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
  display: grid;
  gap: 1.2rem;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 0.45rem;
  top: 0.35rem;
  bottom: 0.35rem;
  width: 1px;
  background: linear-gradient(180deg, var(--color-gold) 0%, var(--color-neon) 100%);
}

.page-about .about-timeline__item {
  position: relative;
  padding-left: 1.7rem;
}

.page-about .about-timeline__marker {
  position: absolute;
  left: 0;
  top: 0.4rem;
  width: 0.9rem;
  height: 0.9rem;
  border-radius: 50%;
  background: var(--color-space);
  border: 2px solid var(--color-gold);
  box-shadow: 0 0 10px rgba(212, 175, 55, 0.3);
  transition: background 0.3s ease, box-shadow 0.3s ease, transform 0.3s ease;
}

.page-about .about-timeline__item[data-reveal].is-visible .about-timeline__marker {
  background: var(--color-gold);
  box-shadow: 0 0 14px rgba(212, 175, 55, 0.65);
  transform: scale(1.12);
}

.page-about .about-timeline__card {
  background: rgba(8, 18, 38, 0.58);
  border: 1px solid var(--border-line);
  border-radius: 12px;
  padding: 1rem 1.1rem;
  transition: border-color 0.2s ease, background 0.2s ease;
}

.page-about .about-timeline__card:hover,
.page-about .about-timeline__card:focus-within {
  border-color: rgba(212, 175, 55, 0.38);
  background: rgba(8, 18, 38, 0.88);
}

.page-about .about-timeline__card h3 {
  margin: 0 0 0.4rem;
  font-family: var(--font-display);
  font-size: 1rem;
  color: var(--color-gold);
}

.page-about .about-timeline__card p {
  margin: 0;
  font-size: 0.84rem;
  line-height: 1.65;
  color: rgba(245, 245, 220, 0.75);
}

.page-about .about-milestone-note {
  font-family: var(--font-body);
  font-size: 0.82rem;
  color: rgba(245, 245, 220, 0.62);
  border: 1px dashed rgba(245, 245, 220, 0.2);
  padding: 0.85rem 1rem;
  border-radius: 10px;
  background: rgba(8, 18, 38, 0.4);
}

.page-about .about-milestone-note p {
  margin: 0;
}

/* 安全图 */
.page-about .about-security-figure {
  margin: 0;
  border-radius: var(--radius-card);
  overflow: hidden;
  border: 1px solid var(--border-line);
  background: var(--color-space-deep);
}

.page-about .about-security-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-height: 300px;
  object-fit: cover;
}

/* 安全网格 */
.page-about .about-security-grid {
  display: grid;
  gap: 0.8rem;
  grid-template-columns: 1fr;
}

.page-about .about-security-item {
  background: rgba(8, 18, 38, 0.56);
  border: 1px solid var(--border-line);
  border-radius: 12px;
  padding: 1rem;
  transition: border-color 0.2s ease, background 0.2s ease;
}

.page-about .about-security-item:hover {
  border-color: rgba(155, 89, 182, 0.3);
  background: rgba(8, 18, 38, 0.86);
}

.page-about .about-security-item h3 {
  margin: 0 0 0.5rem;
  font-family: var(--font-display);
  font-size: 0.92rem;
  color: var(--color-white);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.page-about .about-security-item h3::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 2px;
  background: var(--color-neon);
  flex-shrink: 0;
}

.page-about .about-security-item p {
  margin: 0;
  font-size: 0.8rem;
  line-height: 1.65;
  color: rgba(245, 245, 220, 0.74);
}

/* 页底引导 */
.page-about .about-bottom {
  margin-top: 0.4rem;
}

.page-about .about-bottom__card {
  background: linear-gradient(135deg, rgba(212, 175, 55, 0.12) 0%, rgba(155, 89, 182, 0.08) 100%);
  border: 1px solid rgba(212, 175, 55, 0.28);
  border-radius: var(--radius-card);
  padding: 1.6rem 1.4rem;
  text-align: center;
}

.page-about .about-bottom__card h3 {
  margin: 0 0 0.5rem;
  font-family: var(--font-display);
  font-size: 1.2rem;
  color: var(--color-white);
}

.page-about .about-bottom__card p {
  margin: 0 0 1rem;
  font-family: var(--font-body);
  font-size: 0.88rem;
  color: rgba(245, 245, 220, 0.78);
}

.page-about .about-bottom__links {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.8rem;
}

/* ===== 平板及以上 ===== */
@media (min-width: 768px) {
  .page-about {
    --about-chapter-space: 3.6rem;
  }

  .page-about .about-hero {
    padding: 3rem 0 3.5rem;
  }

  .page-about .about-hero__inner {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    align-items: center;
    gap: 2.5rem;
  }

  .page-about .about-layout {
    grid-template-columns: var(--about-side-w) 1fr;
    gap: 2.75rem;
    align-items: start;
  }

  .page-about .about-sidebar__inner {
    position: sticky;
    top: calc(var(--header-h) + var(--header-top) + 1.2rem);
  }

  .page-about .about-chapter__head {
    grid-template-columns: 3rem 1fr auto;
    gap: 1rem;
  }

  .page-about .about-chapter__num {
    font-size: 1.45rem;
  }

  .page-about .about-chapter__head h2 {
    font-size: 1.8rem;
  }

  .page-about .about-chapter__side-note {
    display: block;
    writing-mode: vertical-rl;
    text-orientation: mixed;
    font-family: var(--font-body);
    font-size: 0.68rem;
    letter-spacing: 0.2em;
    color: rgba(212, 175, 55, 0.52);
    white-space: nowrap;
    justify-self: end;
    padding-left: 1rem;
  }

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

/* ===== 桌面 ===== */
@media (min-width: 1040px) {
  .page-about .about-layout {
    --about-side-w: 250px;
    gap: 3.25rem;
  }

  .page-about .about-hero__content {
    max-width: 580px;
  }

  .page-about .about-hero__lead {
    font-size: 0.96rem;
  }

  .page-about .about-chapter__body {
    font-size: 0.92rem;
  }

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