/* ===== 页面专属 CSS：about ===== */
.page-about {
  --about-pink-glow: rgba(255, 45, 120, 0.16);
  --about-purple-glow: rgba(139, 92, 246, 0.2);
  --about-gold-line: rgba(201, 164, 92, 0.32);
  --about-num-glow: rgba(255, 45, 120, 0.28);
  position: relative;
  background:
    radial-gradient(ellipse at 88% 4%, var(--about-purple-glow), transparent 40%),
    radial-gradient(ellipse at 6% 55%, var(--about-pink-glow), transparent 36%),
    linear-gradient(180deg, var(--bg-deep) 0%, var(--bg-panel) 24%, var(--bg-deep) 62%, var(--bg-panel) 100%);
  overflow: hidden;
  padding-bottom: 80px;
}

.page-about a:focus-visible,
.page-about .btn:focus-visible {
  outline: 2px solid var(--neon-pink);
  outline-offset: 3px;
}

/* 面包屑与上下文条 */
.page-about__context {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding-top: 26px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line-faint);
  margin-bottom: 24px;
}

.page-about__context .breadcrumb {
  margin: 0;
}

.page-about__context .tag {
  flex: 0 0 auto;
  border: 1px solid var(--line-pink);
  color: var(--neon-pink);
  background: rgba(255, 45, 120, 0.06);
  letter-spacing: 0.12em;
}

/* 首屏 */
.page-about__hero {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  padding-top: 8px;
  padding-bottom: 56px;
}

.page-about__hero-image {
  position: relative;
  margin: 0;
}

.page-about__hero-image::before {
  content: "";
  position: absolute;
  left: 18px;
  right: -10px;
  top: 18px;
  bottom: -10px;
  background: linear-gradient(135deg, var(--electric-purple), transparent 70%);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 16px), calc(100% - 16px) 100%, 0 100%);
  opacity: 0.45;
  z-index: 0;
}

.page-about__hero-image img {
  position: relative;
  z-index: 1;
  display: block;
  width: 100%;
  height: auto;
  max-height: 460px;
  object-fit: cover;
  clip-path: polygon(0 0, calc(100% - 22px) 0, 100% 22px, 100% 100%, 22px 100%, 0 calc(100% - 22px));
}

.page-about__hero-copy {
  position: relative;
  z-index: 1;
}

.page-about__hero-copy h1 {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-size: clamp(3rem, 9vw, 5.6rem);
  line-height: 0.92;
  letter-spacing: 0.03em;
  color: var(--text-primary);
  text-shadow: 0 0 36px var(--about-num-glow);
}

.page-about__hero-copy .lede {
  margin: 0 0 22px;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--text-body);
  max-width: 640px;
}

.page-about__hero-copy .btn {
  margin-top: 4px;
}

/* 数据速览 */
.page-about__stats {
  position: relative;
  padding: 36px 0 44px;
  background:
    linear-gradient(90deg, rgba(139, 92, 246, 0.08) 1px, transparent 1px) 0 0 / 40px 40px,
    var(--bg-deep);
  border-top: 1px solid var(--line-pink);
  border-bottom: 1px solid var(--line-faint);
}

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

.page-about__stat-card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 20px 16px;
  background: linear-gradient(160deg, var(--bg-soft), rgba(139, 92, 246, 0.08));
  border: 1px solid var(--line-faint);
  border-left: 2px solid var(--neon-pink);
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 10px 100%, 0 calc(100% - 10px));
}

.page-about__stat-num {
  font-family: var(--font-display);
  font-size: 2.1rem;
  line-height: 1;
  color: var(--text-primary);
  text-shadow: 0 0 22px var(--about-num-glow);
}

.page-about__stat-label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.8rem;
  letter-spacing: 0.06em;
  color: var(--text-muted);
}

.page-about__stat-label::before {
  content: "";
  width: 4px;
  height: 4px;
  background: var(--dark-gold);
  transform: rotate(45deg);
  flex: 0 0 auto;
}

/* 平台定位 */
.page-about__position {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  padding-top: 64px;
  padding-bottom: 40px;
}

.page-about__position-copy h2,
.page-about__timeline h2,
.page-about__categories-head h2,
.page-about__features h2,
.page-about__ops-copy h2,
.page-about__contact h2 {
  margin: 10px 0 18px;
  font-family: var(--font-display);
  font-size: clamp(1.7rem, 4.5vw, 2.8rem);
  line-height: 1.08;
  color: var(--text-primary);
}

.page-about__position-copy p,
.page-about__ops-copy p {
  margin: 0 0 14px;
  line-height: 1.85;
  color: var(--text-body);
}

.page-about__position-figure {
  position: relative;
  margin: 0;
}

.page-about__position-figure::after {
  content: "";
  position: absolute;
  right: -8px;
  bottom: -8px;
  width: 52%;
  height: 38%;
  border-right: 2px solid var(--neon-pink);
  border-bottom: 2px solid var(--neon-pink);
  z-index: 0;
}

.page-about__position-figure img {
  position: relative;
  z-index: 1;
  display: block;
  width: 100%;
  height: auto;
  max-height: 380px;
  object-fit: cover;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 16px), calc(100% - 16px) 100%, 0 100%);
  border: 1px solid var(--line-faint);
}

/* 发展历程 */
.page-about__timeline {
  padding: 64px 0 68px;
  background: linear-gradient(180deg, transparent, rgba(139, 92, 246, 0.1) 30%, transparent);
  border-top: 1px solid var(--line-faint);
  border-bottom: 1px solid var(--line-faint);
}

.page-about__timeline-list {
  list-style: none;
  margin: 36px 0 0;
  padding: 0;
  position: relative;
}

.page-about__timeline-list::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--neon-pink), var(--electric-purple) 55%, var(--dark-gold));
  opacity: 0.55;
}

.page-about__timeline-item {
  position: relative;
  padding: 0 0 30px 34px;
}

.page-about__timeline-item:last-child {
  padding-bottom: 0;
}

.page-about__timeline-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 12px;
  height: 12px;
  background: var(--bg-deep);
  border: 2px solid var(--neon-pink);
  transform: rotate(45deg);
  box-shadow: 0 0 16px rgba(255, 45, 120, 0.35);
}

.page-about__timeline-year {
  display: block;
  margin-bottom: 4px;
  font-family: var(--font-display);
  font-size: 1.45rem;
  line-height: 1.1;
  letter-spacing: 0.08em;
  color: var(--neon-pink);
}

.page-about__timeline-body h3 {
  margin: 0 0 6px;
  font-size: 1.08rem;
  line-height: 1.4;
  color: var(--text-primary);
}

.page-about__timeline-body p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--text-body);
  max-width: 620px;
}

/* 分类体系 */
.page-about__categories {
  padding-top: 64px;
  padding-bottom: 40px;
}

.page-about__categories-head {
  margin-bottom: 28px;
}

.page-about__categories-head p {
  max-width: 640px;
  margin: 0;
  line-height: 1.75;
  color: var(--text-body);
}

.page-about__categories-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about__category-card {
  position: relative;
  padding: 22px 18px 18px;
  background: var(--bg-soft);
  border: 1px solid var(--line-faint);
  clip-path: polygon(0 0, calc(100% - 14px) 0, 100% 14px, 100% 100%, 0 100%);
  overflow: hidden;
  min-height: 150px;
}

.page-about__category-card::before {
  content: "";
  position: absolute;
  right: -28px;
  bottom: -28px;
  width: 100px;
  height: 100px;
  background: linear-gradient(135deg, transparent 45%, rgba(255, 45, 120, 0.12) 45%);
  pointer-events: none;
}

.page-about__category-card:hover {
  border-color: var(--line-pink);
  background: linear-gradient(180deg, var(--bg-soft), rgba(139, 92, 246, 0.08));
}

.page-about__category-num {
  display: block;
  margin-bottom: 14px;
  padding-bottom: 10px;
  font-family: var(--font-display);
  font-size: 0.95rem;
  letter-spacing: 0.14em;
  color: var(--dark-gold);
  border-bottom: 1px solid var(--line-faint);
}

.page-about__category-card h3 {
  margin: 0 0 8px;
  font-size: 1.12rem;
  color: var(--text-primary);
}

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

/* 平台功能 */
.page-about__features {
  padding: 64px 0 60px;
  background: linear-gradient(120deg, rgba(255, 45, 120, 0.07), transparent 40%), var(--bg-panel);
  border-top: 1px solid var(--line-faint);
  border-bottom: 1px solid var(--line-faint);
}

.page-about__features-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-top: 32px;
}

.page-about__feature-item {
  position: relative;
  padding: 20px 16px 16px 42px;
  background: rgba(10, 10, 18, 0.5);
  border: 1px solid var(--line-faint);
}

.page-about__feature-item:hover {
  border-color: var(--line-pink);
}

.page-about__feature-index {
  position: absolute;
  left: 12px;
  top: 18px;
  font-family: var(--font-display);
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  color: var(--neon-pink);
  writing-mode: vertical-rl;
}

.page-about__feature-item h3 {
  margin: 0 0 8px;
  font-size: 1.05rem;
  color: var(--text-primary);
}

.page-about__feature-item p {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.7;
  color: var(--text-body);
}

/* 内容运营 */
.page-about__ops {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  padding-top: 64px;
  padding-bottom: 40px;
}

.page-about__ops-figure {
  position: relative;
  margin: 0;
}

.page-about__ops-figure::before {
  content: "";
  position: absolute;
  left: -8px;
  top: -8px;
  width: 40%;
  height: 46%;
  border-left: 2px solid var(--dark-gold);
  border-top: 2px solid var(--dark-gold);
}

.page-about__ops-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-height: 300px;
  object-fit: cover;
  filter: saturate(0.75) contrast(1.05);
  clip-path: polygon(10px 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%, 0 10px);
}

/* 服务承诺与联系 */
.page-about__contact {
  padding-top: 48px;
  padding-bottom: 32px;
}

.page-about__contact-panel {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  padding: 32px 22px;
  background: linear-gradient(150deg, var(--bg-panel), rgba(139, 92, 246, 0.1));
  border: 1px solid var(--line-faint);
  clip-path: polygon(0 0, calc(100% - 22px) 0, 100% 22px, 100% 100%, 22px 100%, 0 calc(100% - 22px));
  overflow: hidden;
}

.page-about__contact-panel::before {
  content: "";
  position: absolute;
  right: 0;
  top: 0;
  width: 180px;
  height: 180px;
  background: radial-gradient(circle at right top, rgba(255, 45, 120, 0.14), transparent 70%);
  pointer-events: none;
}

.page-about__contact-intro p {
  margin: 0;
  max-width: 560px;
  line-height: 1.8;
  color: var(--text-body);
}

.page-about__contact-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about__contact-list li {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 14px 16px;
  background: rgba(10, 10, 18, 0.55);
  border-left: 2px solid var(--dark-gold);
}

.page-about__contact-label {
  font-size: 0.74rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.page-about__contact-value {
  font-size: 1rem;
  color: var(--text-primary);
  word-break: break-all;
}

/* 返回入口 */
.page-about__back {
  padding-top: 36px;
  text-align: center;
}

/* 响应式：平板 */
@media (min-width: 640px) {
  .page-about__stats-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
  }

  .page-about__categories-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 18px;
  }

  .page-about__features-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 18px;
  }

  .page-about__timeline-item {
    padding-left: 38px;
  }

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

/* 响应式：桌面 */
@media (min-width: 960px) {
  .page-about__hero {
    grid-template-columns: 7fr 5fr;
    align-items: end;
    gap: 48px;
    padding-top: 24px;
    padding-bottom: 76px;
  }

  .page-about__hero-copy h1 {
    font-size: 5.6rem;
  }

  .page-about__position {
    grid-template-columns: 6fr 5fr;
    align-items: center;
    gap: 56px;
    padding-top: 88px;
    padding-bottom: 64px;
  }

  .page-about__timeline {
    padding-top: 88px;
    padding-bottom: 96px;
  }

  .page-about__timeline-list::before {
    left: 50%;
    transform: translateX(-50%);
    top: 4px;
    bottom: 4px;
  }

  .page-about__timeline-item {
    width: 50%;
    padding: 0 52px 44px 0;
  }

  .page-about__timeline-item:nth-child(even) {
    margin-left: 50%;
    padding: 0 0 44px 52px;
  }

  .page-about__timeline-item::before {
    left: auto;
    right: -6px;
  }

  .page-about__timeline-item:nth-child(even)::before {
    right: auto;
    left: -6px;
  }

  .page-about__categories-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
  }

  .page-about__features-grid {
    gap: 20px;
    margin-top: 40px;
  }

  .page-about__ops {
    grid-template-columns: 4fr 7fr;
    align-items: center;
    gap: 56px;
    padding-top: 88px;
    padding-bottom: 64px;
  }

  .page-about__contact-panel {
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    padding: 44px 44px;
  }

  .page-about__back {
    padding-top: 48px;
  }
}