.page-about {
  --about-bg-deep: #07070c;
  --about-card-bg: rgba(26, 26, 36, 0.85);
  --about-pink-glow: rgba(255, 45, 120, 0.5);
  --about-cyan-glow: rgba(0, 229, 255, 0.5);
  --about-gold-glow: rgba(255, 215, 0, 0.45);
  --about-border-alpha: rgba(255, 45, 120, 0.3);
  position: relative;
  background: var(--bg-main);
  color: var(--text-main);
  min-height: 100vh;
  overflow-x: clip;
}

.page-about::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(0, 229, 255, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 229, 255, 0.035) 1px, transparent 1px);
  background-size: 44px 44px;
  pointer-events: none;
  z-index: 0;
}

.page-about::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 100%;
  height: 100%;
  background:
    radial-gradient(ellipse 720px 420px at 85% 8%, rgba(255, 45, 120, 0.10), transparent 65%),
    radial-gradient(ellipse 560px 360px at 12% 72%, rgba(0, 229, 255, 0.08), transparent 60%);
  pointer-events: none;
  z-index: 0;
}

.page-about .about-sidebar,
.page-about .about-content {
  position: relative;
  z-index: 1;
}

/* ========== 左侧固定导航（桌面端） ========== */
.page-about .about-sidebar {
  display: none;
}

/* ========== 内容容器 ========== */
.page-about .about-content {
  padding: 0 20px;
}

/* ========== 首屏 Hero ========== */
.page-about .about-hero {
  padding: 96px 0 56px;
  display: flex;
  flex-direction: column;
}

.page-about .about-hero .section-label {
  margin-top: 32px;
}

.page-about .about-hero h1 {
  font-family: var(--font-body);
  font-size: clamp(1.8rem, 5.4vw, 4.2rem);
  font-weight: 900;
  line-height: 1.14;
  letter-spacing: -0.01em;
  margin: 14px 0 20px;
  max-width: 13em;
}

.page-about .about-hero-sub {
  font-size: clamp(0.92rem, 2vw, 1.06rem);
  line-height: 1.75;
  color: var(--text-dim);
  max-width: 38em;
  margin: 0;
}

.page-about .about-hero-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 28px;
  margin-top: 46px;
  padding-top: 28px;
  border-top: 1px solid var(--border-glow);
}

.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 88px;
}

.page-about .about-stat-num {
  font-family: var(--font-mono);
  font-size: clamp(2.2rem, 5vw, 3.4rem);
  font-weight: 700;
  color: var(--accent-gold);
  text-shadow: 0 0 24px var(--about-gold-glow);
  line-height: 1;
}

.page-about .about-stat-label {
  font-size: 0.76rem;
  letter-spacing: 0.12em;
  color: var(--text-dim);
  text-transform: uppercase;
}

/* ========== 区块通用 ========== */
.page-about .about-story,
.page-about .about-history,
.page-about .about-team,
.page-about .about-credential {
  padding: 72px 0 56px;
  scroll-margin-top: 24px;
}

.page-about .about-story-intro,
.page-about .about-history-intro,
.page-about .about-team-intro,
.page-about .about-credential-intro {
  margin-bottom: 32px;
}

.page-about .about-story-intro h2,
.page-about .about-history-intro h2,
.page-about .about-team-intro h2,
.page-about .about-credential-intro h2 {
  font-size: clamp(1.5rem, 3.6vw, 2.4rem);
  font-weight: 800;
  line-height: 1.2;
  margin: 10px 0 0;
}

.page-about .about-history-intro > p,
.page-about .about-team-intro > p {
  color: var(--text-dim);
  line-height: 1.65;
  margin: 12px 0 0;
  max-width: 32em;
}

/* ========== 品牌故事 ========== */
.page-about .about-story-body {
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.page-about .about-story-copy {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.page-about .about-story-copy p {
  margin: 0;
  line-height: 1.8;
  color: var(--text-main);
  font-size: 0.96rem;
}

.page-about .about-story-copy p:first-child {
  font-size: 1.02rem;
}

.page-about .about-quote {
  position: relative;
  margin: 8px 0 0;
  padding: 20px 22px 16px 24px;
  background: linear-gradient(135deg, rgba(255, 45, 120, 0.08), rgba(0, 229, 255, 0.04));
  border-left: 3px solid var(--accent-pink);
  border-radius: 0 var(--radius) var(--radius) 0;
}

.page-about .about-quote-mark {
  position: absolute;
  top: -8px;
  left: 12px;
  font-size: 3rem;
  color: var(--accent-pink);
  line-height: 1;
  opacity: 0.5;
  font-family: Georgia, serif;
}

.page-about .about-quote p {
  margin: 0;
  font-size: 0.96rem;
  line-height: 1.75;
  color: var(--text-main);
  font-style: italic;
}

.page-about .about-story-figure,
.page-about .about-history-figure,
.page-about .about-team-figure {
  margin: 0;
}

.page-about .about-story-figure img,
.page-about .about-history-figure img,
.page-about .about-team-figure img {
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  display: block;
  border-radius: var(--radius);
  border: 1px solid var(--about-border-alpha);
  box-shadow: 0 0 32px rgba(255, 45, 120, 0.12);
}

/* ========== 发展历程时间轴 ========== */
.page-about .about-history {
  position: relative;
}

.page-about .about-timeline {
  position: relative;
  margin: 8px 0 32px 26px;
  padding-left: 8px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(
    180deg,
    var(--accent-pink),
    var(--accent-cyan) 45%,
    var(--accent-gold) 100%
  );
  opacity: 0.55;
}

.page-about .timeline-item {
  position: relative;
  margin-bottom: 42px;
  padding-left: 28px;
}

.page-about .timeline-item:last-child {
  margin-bottom: 0;
}

.page-about .timeline-marker {
  position: absolute;
  left: -34px;
  top: 2px;
  width: 22px;
  height: 22px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.page-about .timeline-dot {
  display: block;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--accent-pink);
  box-shadow:
    0 0 10px var(--about-pink-glow),
    0 0 24px var(--about-pink-glow);
  transition: transform 0.3s var(--ease-out), box-shadow 0.3s var(--ease-out);
}

.page-about .timeline-item--now .timeline-dot {
  background: var(--accent-gold);
  box-shadow:
    0 0 10px var(--about-gold-glow),
    0 0 26px var(--about-gold-glow);
}

.page-about .timeline-item:hover .timeline-dot,
.page-about .timeline-item:focus-within .timeline-dot {
  transform: scale(1.35);
}

.page-about .timeline-card {
  background: var(--about-card-bg);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: var(--radius);
  padding: 18px 18px 16px;
  transition:
    border-color 0.3s var(--ease-out),
    box-shadow 0.3s var(--ease-out),
    transform 0.3s var(--ease-out);
}

.page-about .timeline-card:hover,
.page-about .timeline-card:focus-within {
  border-color: var(--accent-pink);
  box-shadow: 0 0 32px rgba(255, 45, 120, 0.16);
  transform: translateY(-2px);
}

.page-about .timeline-card h3 {
  font-size: 1.04rem;
  font-weight: 700;
  margin: 10px 0 8px;
}

.page-about .timeline-card p {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.7;
  color: var(--text-dim);
}

.page-about .timeline-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 12px;
}

.page-about .timeline-era {
  font-size: 0.74rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent-cyan);
  border: 1px solid rgba(0, 229, 255, 0.28);
  border-radius: 999px;
  padding: 2px 10px;
  line-height: 1.5;
}

.page-about .timeline-count {
  font-family: var(--font-mono);
  font-size: clamp(2rem, 5vw, 2.8rem);
  font-weight: 700;
  line-height: 1;
  color: var(--accent-gold);
  text-shadow: 0 0 18px var(--about-gold-glow);
  transition: text-shadow 0.3s var(--ease-out);
}

.page-about .timeline-meta:hover .timeline-count,
.page-about .timeline-meta:focus-within .timeline-count {
  text-shadow:
    0 0 12px var(--about-gold-glow),
    0 0 36px rgba(255, 215, 0, 0.7);
}

.page-about .timeline-note {
  font-size: 0.78rem;
  color: var(--text-dim);
  background: rgba(255, 255, 255, 0.04);
  border-radius: 999px;
  padding: 3px 12px;
  line-height: 1.5;
  transition:
    color 0.3s var(--ease-out),
    background 0.3s var(--ease-out);
}

.page-about .timeline-meta:hover .timeline-note,
.page-about .timeline-meta:focus-within .timeline-note {
  color: var(--text-main);
  background: rgba(255, 45, 120, 0.18);
}

.page-about .about-history-figure {
  margin-top: 36px;
}

/* ========== 团队规模 ========== */
.page-about .about-team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-bottom: 36px;
}

.page-about .team-card {
  background: var(--about-card-bg);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: var(--radius);
  padding: 22px 20px;
  position: relative;
  transition:
    border-color 0.3s var(--ease-out),
    box-shadow 0.3s var(--ease-out),
    transform 0.3s var(--ease-out);
}

.page-about .team-card:hover,
.page-about .team-card:focus-within {
  border-color: var(--accent-cyan);
  box-shadow: 0 0 28px rgba(0, 229, 255, 0.12);
  transform: translateY(-2px);
}

.page-about .team-card-index {
  position: absolute;
  top: 14px;
  right: 16px;
  font-family: var(--font-mono);
  font-size: 1.6rem;
  font-weight: 700;
  color: rgba(255, 255, 255, 0.07);
  line-height: 1;
}

.page-about .team-card h3 {
  font-size: 1.08rem;
  font-weight: 700;
  margin: 0 0 8px;
}

.page-about .team-card p {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.65;
  color: var(--text-dim);
}

.page-about .about-team-figure img {
  max-height: 320px;
}

/* ========== 资质与认可 ========== */
.page-about .about-credential-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about .credential-card {
  background: var(--about-card-bg);
  border: 1px solid rgba(0, 229, 255, 0.14);
  border-radius: var(--radius);
  padding: 24px 20px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  transition:
    border-color 0.3s var(--ease-out),
    box-shadow 0.3s var(--ease-out);
}

.page-about .credential-card:hover,
.page-about .credential-card:focus-within {
  border-color: rgba(0, 229, 255, 0.4);
  box-shadow: 0 0 24px rgba(0, 229, 255, 0.12);
}

.page-about .credential-badge {
  display: inline-block;
  align-self: flex-start;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--accent-cyan);
  background: rgba(0, 229, 255, 0.1);
  border: 1px solid rgba(0, 229, 255, 0.28);
  border-radius: 4px;
  padding: 3px 10px;
  margin-bottom: 8px;
}

.page-about .credential-card h3 {
  font-size: 1.06rem;
  font-weight: 700;
  margin: 0;
}

.page-about .credential-card p {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.65;
  color: var(--text-dim);
}

/* ========== 底部导航 CTA ========== */
.page-about .about-nav-cta {
  padding: 48px 0 72px;
  text-align: center;
}

.page-about .about-nav-cta-title {
  font-size: 1.14rem;
  font-weight: 700;
  margin: 0 0 22px;
}

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

/* ========== 平板端 ========== */
@media (min-width: 640px) {
  .page-about .about-content {
    padding: 0 40px;
  }

  .page-about .about-hero {
    padding-top: 120px;
  }

  .page-about .about-story-body {
    flex-direction: row;
    align-items: flex-start;
    gap: 40px;
  }

  .page-about .about-story-copy {
    flex: 1.1;
  }

  .page-about .about-story-figure {
    flex: 0.9;
    margin-top: 8px;
  }

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

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

  .page-about .about-history-intro,
  .page-about .about-team-intro,
  .page-about .about-credential-intro {
    margin-bottom: 40px;
  }
}

/* ========== 桌面端 ========== */
@media (min-width: 1024px) {
  .page-about {
    display: block;
  }

  .page-about .about-sidebar {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    position: fixed;
    left: 0;
    top: 0;
    bottom: 0;
    width: 264px;
    padding: 40px 36px 36px;
    background: linear-gradient(180deg, rgba(26, 26, 36, 0.92), rgba(7, 7, 12, 0.96));
    border-right: 1px solid var(--about-border-alpha);
    z-index: 10;
  }

  .page-about .about-sidebar-head {
    display: flex;
    flex-direction: column;
    gap: 6px;
  }

  .page-about .about-sidebar-num {
    font-family: var(--font-mono);
    font-size: 3.4rem;
    font-weight: 700;
    line-height: 1;
    color: var(--accent-gold);
    text-shadow: 0 0 28px var(--about-gold-glow);
  }

  .page-about .about-sidebar-label {
    font-size: 0.78rem;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--text-dim);
  }

  .page-about .about-sidebar-nav {
    display: flex;
    flex-direction: column;
    gap: 18px;
    margin: 32px 0;
  }

  .page-about .about-sidebar-nav a {
    display: flex;
    align-items: baseline;
    gap: 12px;
    color: var(--text-dim);
    text-decoration: none;
    font-size: 0.92rem;
    padding: 6px 0;
    border-bottom: 1px solid transparent;
    transition:
      color 0.3s var(--ease-out),
      border-color 0.3s var(--ease-out),
      padding-left 0.3s var(--ease-out);
  }

  .page-about .about-sidebar-nav a:hover,
  .page-about .about-sidebar-nav a:focus-visible {
    color: var(--text-main);
    border-color: var(--accent-pink);
    padding-left: 8px;
  }

  .page-about .about-sidebar-index {
    font-family: var(--font-mono);
    font-size: 0.74rem;
    color: var(--accent-pink);
  }

  .page-about .about-sidebar-foot {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.78rem;
    color: var(--text-dim);
  }

  .page-about .about-sidebar-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--accent-gold);
    box-shadow: 0 0 10px var(--about-gold-glow);
    animation: about-pulse 2s ease-in-out infinite;
  }

  .page-about .about-content {
    margin-left: 264px;
    padding: 0 clamp(32px, 5vw, 80px);
    max-width: 1100px;
  }

  .page-about .about-hero {
    min-height: 82vh;
    justify-content: center;
    padding: 120px 0 72px;
  }

  .page-about .about-hero h1 {
    font-size: clamp(2.6rem, 4.4vw, 4.6rem);
  }

  .page-about .about-story,
  .page-about .about-history,
  .page-about .about-team,
  .page-about .about-credential {
    padding: 96px 0 72px;
  }

  .page-about .about-timeline {
    margin-left: 48px;
    padding-left: 32px;
  }

  .page-about .timeline-marker {
    left: -52px;
  }

  .page-about .timeline-card {
    padding: 22px 26px 20px;
  }

  .page-about .timeline-count {
    font-size: 2.6rem;
  }
}

/* ========== 细粒度时间轴卡片适配 ========== */
@media (min-width: 480px) and (max-width: 1023px) {
  .page-about .timeline-card {
    display: grid;
    grid-template-columns: auto 1fr;
    column-gap: 18px;
    align-items: start;
  }

  .page-about .timeline-card h3,
  .page-about .timeline-card p {
    grid-column: 2;
  }

  .page-about .timeline-meta {
    grid-column: 1;
    grid-row: 1 / span 2;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
  }
}

/* ========== 桌面端首屏动效 ========== */
@media (prefers-reduced-motion: no-preference) {
  .page-about .about-stat-num {
    animation: about-stat-enter 0.8s var(--ease-out) both;
  }

  .page-about .about-stat:nth-child(1) .about-stat-num {
    animation-delay: 0.2s;
  }

  .page-about .about-stat:nth-child(2) .about-stat-num {
    animation-delay: 0.32s;
  }

  .page-about .about-stat:nth-child(3) .about-stat-num {
    animation-delay: 0.44s;
  }

  .page-about .timeline-item {
    animation: about-timeline-enter 0.7s var(--ease-out) both;
  }

  .page-about .timeline-item:nth-child(1) {
    animation-delay: 0.1s;
  }

  .page-about .timeline-item:nth-child(2) {
    animation-delay: 0.24s;
  }

  .page-about .timeline-item:nth-child(3) {
    animation-delay: 0.38s;
  }

  .page-about .timeline-item:nth-child(4) {
    animation-delay: 0.52s;
  }
}

@keyframes about-timeline-enter {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes about-stat-enter {
  from {
    opacity: 0;
    transform: scale(0.92);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

@keyframes about-pulse {
  0%,
  100% {
    opacity: 1;
    transform: scale(1);
  }
  50% {
    opacity: 0.6;
    transform: scale(0.85);
  }
}