.page-about {
  --about-gold-glow: rgba(255, 215, 0, 0.3);
  --about-purple-glow: rgba(106, 13, 173, 0.5);
  --about-green-glow: rgba(0, 255, 136, 0.28);
  background: var(--color-black);
  color: var(--color-white);
  overflow-x: hidden;
  font-family: var(--font-body);
}

/* ========== 首屏 Hero ========== */
.page-about .about-hero {
  position: relative;
  padding: 48px 0 56px;
  background:
    radial-gradient(ellipse at 82% 18%, rgba(106, 13, 173, 0.42), transparent 62%),
    radial-gradient(ellipse at 8% 88%, rgba(255, 215, 0, 0.08), transparent 52%),
    var(--color-black);
}

.page-about .about-hero__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
  align-items: center;
}

.page-about .about-hero__kicker {
  margin: 20px 0 10px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--color-gold);
  display: flex;
  align-items: center;
  gap: 10px;
}

.page-about .about-hero__kicker::before {
  content: '';
  width: 34px;
  height: 2px;
  background: linear-gradient(90deg, var(--color-purple), var(--color-gold));
  border-radius: var(--radius-pill);
}

.page-about .about-hero__title {
  margin: 0 0 16px;
  font-family: var(--font-heading);
  font-size: clamp(30px, 5vw, 56px);
  font-weight: 900;
  letter-spacing: 0.04em;
  line-height: 1.16;
  color: var(--color-white);
  text-shadow: 0 0 10px rgba(106, 13, 173, 0.8), 0 0 20px rgba(255, 215, 0, 0.3);
}

.page-about .about-hero__lead {
  font-size: 16px;
  line-height: 1.8;
  max-width: 540px;
  color: var(--color-silver);
  margin-bottom: 24px;
}

.page-about .about-hero__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin-bottom: 28px;
}

.page-about .about-hero__icp {
  font-size: 13px;
  color: var(--color-silver);
  padding: 6px 14px;
  border: 1px solid rgba(230, 194, 0, 0.35);
  border-radius: var(--radius-pill);
  background: rgba(18, 18, 18, 0.6);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.page-about .about-hero__visual {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid rgba(255, 215, 0, 0.2);
  background: var(--color-card);
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.6), 0 0 32px rgba(106, 13, 173, 0.35);
}

.page-about .about-hero__visual::after {
  content: '';
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(135deg, rgba(255, 215, 0, 0.18), transparent 42%),
    linear-gradient(45deg, transparent 68%, rgba(106, 13, 173, 0.4));
  mix-blend-mode: screen;
}

.page-about .about-hero__visual img {
  display: block;
  width: 100%;
  height: auto;
  max-height: 440px;
  object-fit: cover;
}

/* ========== 品牌简史 ========== */
.page-about .about-story {
  padding: 64px 0 56px;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
}

.page-about .about-story__layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}

.page-about .about-story__aside {
  display: flex;
  align-items: flex-start;
  gap: 18px;
}

.page-about .about-story__aside h2 {
  margin: 0;
  font-family: var(--font-heading);
  font-size: clamp(22px, 3vw, 30px);
  font-weight: 900;
  letter-spacing: 0.04em;
}

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

.page-about .about-story__lead {
  font-size: 18px;
  line-height: 1.8;
  color: var(--color-white);
  font-weight: 600;
  margin: 0;
}

.page-about .about-story__body {
  font-size: 15px;
  line-height: 1.85;
  color: var(--color-silver);
  margin: 0;
  max-width: 720px;
}

.page-about .about-story__facts {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  margin-top: 10px;
}

.page-about .about-story__fact {
  padding: 18px 16px;
  border-radius: var(--radius-md);
  background: linear-gradient(145deg, #17121e, var(--color-card));
  border: 1px solid rgba(255, 215, 0, 0.14);
  text-align: center;
  transition: transform var(--transition-base), border-color var(--transition-base);
}

.page-about .about-story__fact:hover {
  transform: translateY(-3px);
  border-color: rgba(255, 215, 0, 0.45);
}

.page-about .about-story__num {
  display: block;
  font-family: var(--font-heading);
  font-size: 26px;
  font-weight: 900;
  color: var(--color-gold);
  text-shadow: 0 0 16px var(--about-gold-glow);
  letter-spacing: 0.02em;
}

.page-about .about-story__label {
  display: block;
  margin-top: 6px;
  font-size: 12px;
  color: var(--color-silver);
  letter-spacing: 0.06em;
}

/* ========== 版本演进时间轴 ========== */
.page-about .about-timeline {
  padding: 56px 0 64px;
  position: relative;
  background: linear-gradient(180deg, var(--color-black) 0%, #100b18 48%, var(--color-black) 100%);
}

.page-about .about-timeline__head {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-bottom: 40px;
}

.page-about .about-timeline__heading h2,
.page-about .about-stats__heading h2,
.page-about .about-categories__heading h2,
.page-about .about-values__heading h2 {
  margin: 0;
  font-family: var(--font-heading);
  font-size: clamp(24px, 3.4vw, 34px);
  font-weight: 900;
  letter-spacing: 0.04em;
  line-height: 1.2;
}

.page-about .about-timeline__sub,
.page-about .about-stats__sub,
.page-about .about-categories__sub,
.page-about .about-values__sub {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--color-silver);
  max-width: 640px;
}

.page-about .about-timeline__container {
  padding-left: 12px;
  padding-right: 12px;
}

.page-about .timeline-wrap {
  display: flex;
  flex-direction: column;
  gap: 28px;
  max-width: 860px;
  margin: 0 auto;
}

.page-about .timeline-item {
  display: grid;
  grid-template-columns: 58px 26px 1fr;
  gap: 0 10px;
  align-items: start;
}

.page-about .timeline-marker {
  text-align: right;
  padding-top: 16px;
  position: relative;
  z-index: 2;
}

.page-about .timeline-year {
  font-family: var(--font-heading);
  font-size: 18px;
  font-weight: 900;
  color: var(--color-gold);
  letter-spacing: 0.02em;
  white-space: nowrap;
  text-shadow: 0 0 14px var(--about-gold-glow);
}

.page-about .timeline-track {
  position: relative;
  display: flex;
  justify-content: center;
  height: 100%;
}

.page-about .timeline-track::after {
  content: '';
  position: absolute;
  top: 0;
  bottom: -28px;
  width: 2px;
  background: linear-gradient(to bottom, rgba(255, 215, 0, 0.85), rgba(255, 215, 0, 0.1));
}

.page-about .timeline-item:first-child .timeline-track::after {
  top: 22px;
}

.page-about .timeline-item:last-child .timeline-track::after {
  bottom: auto;
  height: 26px;
}

.page-about .timeline-dot {
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: var(--color-gold);
  border: 2px solid var(--color-black);
  box-shadow: 0 0 14px var(--about-gold-glow);
  margin-top: 18px;
  position: relative;
  z-index: 2;
}

.page-about .timeline-dot--current {
  background: var(--color-green);
  box-shadow: 0 0 18px var(--about-green-glow);
}

.page-about .timeline-card {
  padding: 20px 18px;
  border-radius: var(--radius-md);
  background: linear-gradient(150deg, #17121e 0%, #121212 100%);
  border: 1px solid rgba(255, 255, 255, 0.07);
  position: relative;
  overflow: hidden;
  transition: border-color var(--transition-base), box-shadow var(--transition-base), transform var(--transition-base);
}

.page-about .timeline-card:hover,
.page-about .timeline-card--current {
  border-color: rgba(255, 215, 0, 0.38);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.4), 0 0 24px rgba(106, 13, 173, 0.2);
}

.page-about .timeline-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: linear-gradient(to bottom, var(--color-purple), var(--color-gold));
  border-radius: 0 4px 4px 0;
  opacity: 0.7;
}

.page-about .timeline-version {
  display: inline-block;
  margin-bottom: 10px;
}

.page-about .timeline-card h3 {
  margin: 0 0 10px;
  font-family: var(--font-heading);
  font-size: 19px;
  font-weight: 900;
  letter-spacing: 0.03em;
}

.page-about .timeline-card p {
  margin: 0 0 14px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--color-silver);
}

.page-about .timeline-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .timeline-tags span {
  font-size: 12px;
  padding: 4px 12px;
  border-radius: var(--radius-pill);
  background: rgba(106, 13, 173, 0.24);
  border: 1px solid rgba(106, 13, 173, 0.5);
  color: #d9b8ff;
}

/* ========== 运营数据概览 ========== */
.page-about .about-stats {
  padding: 56px 0 64px;
  position: relative;
  overflow: hidden;
}

.page-about .stats-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}

.page-about .stats-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.2;
}

.page-about .stats-bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(13, 13, 13, 0.96) 0%, rgba(13, 13, 13, 0.82) 50%, rgba(13, 13, 13, 0.96) 100%),
    radial-gradient(ellipse at center, rgba(106, 13, 173, 0.24), transparent 64%);
}

.page-about .about-stats .container {
  position: relative;
  z-index: 1;
}

.page-about .about-stats__head {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-bottom: 34px;
}

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

.page-about .stat-card {
  padding: 22px 16px;
  border-radius: var(--radius-lg);
  background: rgba(18, 18, 18, 0.84);
  border: 1px solid rgba(255, 255, 255, 0.07);
  position: relative;
  text-align: center;
  transition: transform var(--transition-base), border-color var(--transition-base), box-shadow var(--transition-base);
  backdrop-filter: blur(6px);
}

.page-about .stat-card:nth-child(4n-1) {
  transform: rotate(-1deg);
}

.page-about .stat-card:nth-child(4n) {
  transform: rotate(1.2deg);
}

.page-about .stat-card:hover {
  transform: rotate(0deg) translateY(-4px);
  border-color: rgba(255, 215, 0, 0.42);
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.45), 0 0 22px var(--about-purple-glow);
}

.page-about .stat-num {
  display: block;
  font-family: var(--font-heading);
  font-size: clamp(28px, 5vw, 44px);
  font-weight: 900;
  line-height: 1.1;
  color: transparent;
  background: linear-gradient(135deg, var(--color-gold) 10%, #fff1a8 45%, var(--color-warm-gold) 90%);
  -webkit-background-clip: text;
  background-clip: text;
  letter-spacing: 0.02em;
  text-shadow: 0 0 22px rgba(255, 215, 0, 0.16);
  font-variant-numeric: tabular-nums;
}

.page-about .stat-label {
  display: block;
  margin-top: 8px;
  font-size: 12px;
  color: var(--color-silver);
  letter-spacing: 0.06em;
  line-height: 1.5;
}

/* ========== 分类体系地图 ========== */
.page-about .about-categories {
  padding: 56px 0 64px;
  background: linear-gradient(180deg, var(--color-black), #110b1a 55%, var(--color-black));
}

.page-about .about-categories__head {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-bottom: 34px;
}

.page-about .categories-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
}

.page-about .category-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.page-about .category-item {
  position: relative;
  padding: 16px 18px 16px 54px;
  border-radius: var(--radius-md);
  background: rgba(18, 18, 18, 0.82);
  border: 1px solid rgba(255, 255, 255, 0.07);
  transition: background var(--transition-base), border-color var(--transition-base), box-shadow var(--transition-base), transform var(--transition-base);
  overflow: hidden;
}

.page-about .category-item::before {
  content: '';
  position: absolute;
  left: 0;
  top: 14px;
  bottom: 14px;
  width: 3px;
  border-radius: 0 3px 3px 0;
  background: linear-gradient(180deg, var(--color-purple), var(--color-gold));
  opacity: 0;
  transition: opacity var(--transition-base);
}

.page-about .category-item:hover {
  transform: translateX(4px);
  background: rgba(106, 13, 173, 0.16);
  border-color: rgba(255, 215, 0, 0.35);
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.35);
}

.page-about .category-item:hover::before {
  opacity: 1;
}

.page-about .category-index {
  position: absolute;
  left: 14px;
  top: 14px;
  font-family: var(--font-heading);
  font-size: 22px;
  font-weight: 900;
  color: rgba(255, 215, 0, 0.75);
  opacity: 0.7;
  transition: opacity var(--transition-base);
}

.page-about .category-item:hover .category-index {
  opacity: 1;
}

.page-about .category-item h3 {
  margin: 0 0 8px;
  font-family: var(--font-heading);
  font-size: 17px;
  font-weight: 900;
  letter-spacing: 0.04em;
}

.page-about .category-subs {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.page-about .category-subs li {
  font-size: 12px;
  padding: 3px 10px;
  border-radius: var(--radius-pill);
  background: rgba(0, 255, 136, 0.07);
  border: 1px solid rgba(0, 255, 136, 0.18);
  color: #a5ffd4;
  transition: background var(--transition-fast), border-color var(--transition-fast);
}

.page-about .category-item:hover .category-subs li {
  background: rgba(0, 255, 136, 0.13);
  border-color: rgba(0, 255, 136, 0.4);
}

.page-about .category-visual {
  display: flex;
  flex-direction: column;
  gap: 14px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  padding: 14px;
  background: linear-gradient(150deg, rgba(106, 13, 173, 0.3), rgba(18, 18, 18, 0.8));
  border: 1px solid rgba(255, 215, 0, 0.16);
}

.page-about .category-visual img {
  width: 100%;
  height: auto;
  max-height: 380px;
  object-fit: cover;
  border-radius: var(--radius-md);
}

.page-about .category-visual__note {
  margin: 0;
  font-size: 14px;
  color: var(--color-silver);
  line-height: 1.6;
  text-align: center;
  padding: 0 6px;
}

/* ========== 服务理念 ========== */
.page-about .about-values {
  padding: 56px 0 72px;
  position: relative;
}

.page-about .about-values::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 80%;
  max-width: 800px;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255, 215, 0, 0.35), transparent);
}

.page-about .about-values__head {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-bottom: 34px;
}

.page-about .values-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.page-about .value-item {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2px;
  padding: 20px 18px;
  border-radius: var(--radius-md);
  background: rgba(18, 18, 18, 0.7);
  border: 1px solid rgba(255, 255, 255, 0.07);
  transition: border-color var(--transition-base), box-shadow var(--transition-base), background var(--transition-base);
}

.page-about .value-item:hover {
  background: rgba(106, 13, 173, 0.14);
  border-color: rgba(255, 215, 0, 0.32);
  box-shadow: 0 8px 22px rgba(0, 0, 0, 0.3);
}

.page-about .value-num {
  font-family: var(--font-heading);
  font-size: 28px;
  font-weight: 900;
  color: transparent;
  background: linear-gradient(135deg, var(--color-gold), var(--color-purple));
  -webkit-background-clip: text;
  background-clip: text;
  letter-spacing: 0.02em;
}

.page-about .value-copy h3 {
  margin: 8px 0 8px;
  font-family: var(--font-heading);
  font-size: 18px;
  font-weight: 900;
  letter-spacing: 0.04em;
}

.page-about .value-copy p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--color-silver);
  max-width: 620px;
}

.page-about .about-values__cta {
  margin-top: 36px;
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  justify-content: flex-start;
}

/* ========== 响应式调整 ========== */
@media (min-width: 560px) {
  .page-about .stats-grid {
    grid-template-columns: repeat(3, 1fr);
  }

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

  .page-about .value-item {
    grid-template-columns: 72px 1fr;
    gap: 0 18px;
  }

  .page-about .value-num {
    font-size: 32px;
    padding-top: 2px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    padding: 64px 0 72px;
  }

  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: 48px;
  }

  .page-about .about-story__layout {
    grid-template-columns: 240px 1fr;
    gap: 44px;
  }

  .page-about .about-story__aside {
    flex-direction: column;
    gap: 14px;
  }

  .page-about .about-timeline__head,
  .page-about .about-stats__head,
  .page-about .about-categories__head,
  .page-about .about-values__head {
    grid-template-columns: 120px 1fr;
    gap: 32px;
    align-items: start;
  }

  .page-about .timeline-item {
    grid-template-columns: 130px 36px 1fr;
    gap: 0 20px;
  }

  .page-about .timeline-year {
    font-size: 22px;
    padding-top: 2px;
  }

  .page-about .timeline-card {
    padding: 26px 28px;
  }

  .page-about .timeline-card h3 {
    font-size: 21px;
  }

  .page-about .stats-grid {
    grid-template-columns: repeat(4, 1fr);
    gap: 18px;
  }

  .page-about .stat-card {
    padding: 28px 18px;
  }

  .page-about .categories-layout {
    grid-template-columns: minmax(0, 1fr) 320px;
    gap: 32px;
    align-items: start;
  }

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

  .page-about .category-item {
    padding: 18px 20px 18px 58px;
  }

  .page-about .category-visual {
    position: sticky;
    top: 96px;
  }

  .page-about .value-item {
    grid-template-columns: 96px 1fr;
    padding: 24px 28px;
  }
}

@media (min-width: 1200px) {
  .page-about .about-hero__title {
    font-size: 58px;
  }

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

  .page-about .timeline-item {
    grid-template-columns: 180px 40px 1fr;
  }
}