.page-about {
  --about-gold: #D4AF37;
  --about-crimson: #8B0000;
  --about-lime: #C9E265;
  --about-dark: #1A1A2E;
  --about-gray: #2B2B3D;
  --about-white: #F5F5F5;
  --about-dull-gold: #B8922E;
  --about-silver: #A0A0B0;
  --about-gold-gradient: linear-gradient(135deg, #D4AF37 0%, #F5D76E 40%, #B8922E 100%);
  --about-radius-pill: 9999px;
  --about-radius-md: 16px;
  --about-radius-lg: 24px;
  --about-transition: 0.25s cubic-bezier(0.25, 0.1, 0.25, 1);
  --about-shadow: 0 4px 24px rgba(0, 0, 0, 0.5);
}

/* ===== 面包屑 ===== */
.page-about .about-breadcrumb {
  padding: 16px 0 8px;
  background: var(--about-dark);
}

.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px 10px;
  font-family: var(--font-body, "PingFang SC", "Microsoft YaHei", sans-serif);
  font-size: 13px;
  letter-spacing: 0.3px;
}

.page-about .breadcrumb__link {
  color: var(--about-dull-gold);
  text-decoration: none;
  transition: color var(--about-transition);
  border-bottom: 1px solid transparent;
}

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

.page-about .breadcrumb__separator {
  color: var(--about-silver);
  font-size: 12px;
  user-select: none;
}

.page-about .breadcrumb__current {
  color: var(--about-white);
  font-weight: 600;
}

/* ===== Hero 区域 ===== */
.page-about .about-hero {
  padding: 28px 0 48px;
  background: var(--about-dark);
  position: relative;
  overflow: hidden;
}

.page-about .about-hero::before {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 45%;
  height: 100%;
  background: linear-gradient(135deg, transparent 0%, rgba(139, 0, 0, 0.18) 60%, rgba(212, 175, 55, 0.08) 100%);
  pointer-events: none;
  z-index: 0;
}

.page-about .about-hero__grid {
  display: flex;
  flex-direction: column;
  gap: 32px;
  position: relative;
  z-index: 1;
}

.page-about .about-hero__text {
  order: 1;
}

.page-about .about-hero__label {
  display: inline-block;
  font-family: var(--font-heading, "PingFang SC", "Arial Black", sans-serif);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--about-lime);
  background: rgba(201, 226, 101, 0.12);
  padding: 4px 14px;
  border-radius: var(--about-radius-pill);
  margin-bottom: 12px;
}

.page-about .about-hero__title {
  font-family: var(--font-heading, "PingFang SC", "Arial Black", sans-serif);
  font-size: clamp(36px, 10vw, 72px);
  font-weight: 900;
  line-height: 1.05;
  background: var(--about-gold-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin: 0 0 16px;
  letter-spacing: -0.5px;
}

.page-about .about-hero__desc {
  font-family: var(--font-body, "PingFang SC", "Microsoft YaHei", sans-serif);
  font-size: 16px;
  line-height: 1.7;
  color: var(--about-white);
  max-width: 520px;
  margin: 0 0 24px;
  opacity: 0.88;
}

.page-about .about-hero__visual {
  order: 0;
}

.page-about .about-hero__img {
  width: 100%;
  height: auto;
  border-radius: var(--about-radius-lg);
  object-fit: cover;
  box-shadow: var(--about-shadow);
  border: 1px solid rgba(212, 175, 55, 0.25);
  transition: transform var(--about-transition), box-shadow var(--about-transition);
}

.page-about .about-hero__img:hover {
  transform: scale(1.01);
  box-shadow: 0 6px 32px rgba(212, 175, 55, 0.2);
}

.page-about .btn--primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-heading, "PingFang SC", "Arial Black", sans-serif);
  font-size: 14px;
  font-weight: 700;
  padding: 12px 28px;
  border-radius: var(--about-radius-pill);
  background: var(--about-gold-gradient);
  color: var(--about-dark);
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition: transform var(--about-transition), box-shadow var(--about-transition);
  box-shadow: 0 2px 12px rgba(212, 175, 55, 0.3);
}

.page-about .btn--primary:hover,
.page-about .btn--primary:focus-visible {
  transform: translateY(-2px) scale(1.02);
  box-shadow: 0 6px 24px rgba(212, 175, 55, 0.45);
}

/* ===== 覆盖范围 ===== */
.page-about .about-coverage {
  padding: 48px 0;
  background: var(--about-gray);
  position: relative;
}

.page-about .about-coverage::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--about-gold-gradient);
  opacity: 0.4;
}

.page-about .about-coverage__header {
  margin-bottom: 32px;
}

.page-about .about-coverage__title {
  font-family: var(--font-heading, "PingFang SC", "Arial Black", sans-serif);
  font-size: clamp(28px, 6vw, 44px);
  font-weight: 900;
  color: var(--about-white);
  margin: 0 0 12px;
  line-height: 1.15;
}

.page-about .about-coverage__subtitle {
  font-family: var(--font-body, "PingFang SC", "Microsoft YaHei", sans-serif);
  font-size: 15px;
  line-height: 1.7;
  color: var(--about-silver);
  max-width: 640px;
}

.page-about .text-gold {
  color: var(--about-gold);
  font-weight: 700;
}

.page-about .about-coverage__image-wrap {
  margin-bottom: 32px;
}

.page-about .about-coverage__img {
  width: 100%;
  height: auto;
  border-radius: var(--about-radius-md);
  object-fit: cover;
  border: 1px solid rgba(160, 160, 176, 0.15);
  box-shadow: 0 2px 16px rgba(0, 0, 0, 0.3);
}

.page-about .about-coverage__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 12px;
  list-style: none;
  margin: 0 0 20px;
  padding: 0;
}

.page-about .about-coverage__tag {
  display: inline-flex;
  align-items: center;
  font-family: var(--font-body, "PingFang SC", "Microsoft YaHei", sans-serif);
  font-size: 13px;
  font-weight: 600;
  padding: 8px 20px;
  border-radius: var(--about-radius-pill);
  background: rgba(212, 175, 55, 0.1);
  color: var(--about-gold);
  border: 1px solid rgba(212, 175, 55, 0.3);
  transition: background var(--about-transition), color var(--about-transition), border-color var(--about-transition), transform var(--about-transition);
  cursor: default;
  letter-spacing: 0.3px;
}

.page-about .about-coverage__tag:hover {
  background: var(--about-gold);
  color: var(--about-dark);
  border-color: var(--about-gold);
  transform: translateY(-2px);
}

.page-about .about-coverage__tag--more {
  background: rgba(201, 226, 101, 0.1);
  color: var(--about-lime);
  border-color: rgba(201, 226, 101, 0.25);
  font-weight: 700;
}

.page-about .about-coverage__tag--more:hover {
  background: var(--about-lime);
  color: var(--about-dark);
  border-color: var(--about-lime);
}

.page-about .about-coverage__footnote {
  font-family: var(--font-body, "PingFang SC", "Microsoft YaHei", sans-serif);
  font-size: 14px;
  line-height: 1.65;
  color: var(--about-silver);
  max-width: 600px;
  border-left: 3px solid var(--about-gold);
  padding-left: 16px;
  margin: 0;
}

/* ===== 持续进化 ===== */
.page-about .about-evolution {
  padding: 48px 0;
  background: var(--about-dark);
  position: relative;
}

.page-about .about-evolution__title {
  font-family: var(--font-heading, "PingFang SC", "Arial Black", sans-serif);
  font-size: clamp(28px, 6vw, 44px);
  font-weight: 900;
  color: var(--about-white);
  margin: 0 0 12px;
  line-height: 1.15;
}

.page-about .about-evolution__intro {
  font-family: var(--font-body, "PingFang SC", "Microsoft YaHei", sans-serif);
  font-size: 15px;
  line-height: 1.7;
  color: var(--about-silver);
  max-width: 540px;
  margin: 0 0 36px;
}

.page-about .about-evolution__compare {
  display: flex;
  flex-direction: column;
  gap: 0;
  margin-bottom: 32px;
  position: relative;
}

.page-about .about-evolution__card {
  background: var(--about-gray);
  border-radius: var(--about-radius-md);
  padding: 24px 20px;
  border: 1px solid rgba(160, 160, 176, 0.12);
  transition: border-color var(--about-transition), box-shadow var(--about-transition);
}

.page-about .about-evolution__card--old {
  border-left: 4px solid var(--about-crimson);
  margin-bottom: 12px;
}

.page-about .about-evolution__card--new {
  border-left: 4px solid var(--about-gold);
  background: rgba(212, 175, 55, 0.04);
}

.page-about .about-evolution__card:hover {
  border-color: var(--about-gold);
  box-shadow: 0 4px 20px rgba(212, 175, 55, 0.08);
}

.page-about .about-evolution__badge {
  display: inline-block;
  font-family: var(--font-heading, "PingFang SC", "Arial Black", sans-serif);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  padding: 3px 12px;
  border-radius: var(--about-radius-pill);
  background: var(--about-crimson);
  color: var(--about-white);
  margin-bottom: 12px;
}

.page-about .about-evolution__badge--current {
  background: var(--about-gold-gradient);
  color: var(--about-dark);
}

.page-about .about-evolution__card-title {
  font-family: var(--font-heading, "PingFang SC", "Arial Black", sans-serif);
  font-size: 17px;
  font-weight: 700;
  color: var(--about-white);
  margin: 0 0 12px;
}

.page-about .about-evolution__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.page-about .about-evolution__list li {
  font-family: var(--font-body, "PingFang SC", "Microsoft YaHei", sans-serif);
  font-size: 13px;
  line-height: 1.6;
  color: var(--about-silver);
  padding-left: 16px;
  position: relative;
}

.page-about .about-evolution__list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 9px;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--about-gold);
  opacity: 0.5;
}

.page-about .about-evolution__divider {
  display: none;
}

.page-about .about-evolution__visual {
  margin-bottom: 20px;
}

.page-about .about-evolution__img {
  width: 100%;
  height: auto;
  border-radius: var(--about-radius-md);
  object-fit: cover;
  border: 1px solid rgba(212, 175, 55, 0.15);
  box-shadow: 0 2px 16px rgba(0, 0, 0, 0.3);
}

.page-about .about-evolution__note {
  font-family: var(--font-body, "PingFang SC", "Microsoft YaHei", sans-serif);
  font-size: 14px;
  line-height: 1.65;
  color: var(--about-silver);
  margin: 0;
}

.page-about .about-evolution__link {
  color: var(--about-gold);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--about-transition), color var(--about-transition);
}

.page-about .about-evolution__link:hover,
.page-about .about-evolution__link:focus-visible {
  color: var(--about-lime);
  border-bottom-color: var(--about-lime);
}

/* ===== 联系与支持 ===== */
.page-about .about-support {
  padding: 48px 0 64px;
  background: var(--about-gray);
  position: relative;
}

.page-about .about-support::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--about-crimson), var(--about-gold), var(--about-lime));
  opacity: 0.3;
}

.page-about .about-support__title {
  font-family: var(--font-heading, "PingFang SC", "Arial Black", sans-serif);
  font-size: clamp(26px, 5vw, 38px);
  font-weight: 900;
  color: var(--about-white);
  margin: 0 0 12px;
  line-height: 1.15;
}

.page-about .about-support__desc {
  font-family: var(--font-body, "PingFang SC", "Microsoft YaHei", sans-serif);
  font-size: 15px;
  line-height: 1.7;
  color: var(--about-silver);
  max-width: 520px;
  margin: 0 0 32px;
}

.page-about .about-support__card {
  background: var(--about-dark);
  border-radius: var(--about-radius-lg);
  padding: 28px 24px;
  border: 1px solid rgba(212, 175, 55, 0.2);
  box-shadow: var(--about-shadow);
  margin-bottom: 28px;
}

.page-about .about-support__item {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 14px 0;
  border-bottom: 1px solid rgba(160, 160, 176, 0.08);
}

.page-about .about-support__item:last-of-type {
  border-bottom: none;
}

.page-about .about-support__label {
  font-family: var(--font-heading, "PingFang SC", "Arial Black", sans-serif);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--about-dull-gold);
}

.page-about .about-support__value {
  font-family: var(--font-body, "PingFang SC", "Microsoft YaHei", sans-serif);
  font-size: 16px;
  font-weight: 600;
  color: var(--about-white);
  text-decoration: none;
  transition: color var(--about-transition);
}

.page-about .about-support__value--text {
  font-weight: 400;
  color: var(--about-silver);
}

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

.page-about .about-support__note {
  margin-top: 16px;
  font-family: var(--font-body, "PingFang SC", "Microsoft YaHei", sans-serif);
  font-size: 13px;
  line-height: 1.6;
  color: var(--about-dull-gold);
  padding: 12px 16px;
  background: rgba(212, 175, 55, 0.06);
  border-radius: var(--about-radius-md);
  border-left: 3px solid var(--about-gold);
}

.page-about .about-support__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .btn--secondary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-heading, "PingFang SC", "Arial Black", sans-serif);
  font-size: 13px;
  font-weight: 700;
  padding: 10px 24px;
  border-radius: var(--about-radius-pill);
  background: transparent;
  color: var(--about-gold);
  text-decoration: none;
  border: 1.5px solid var(--about-gold);
  cursor: pointer;
  transition: background var(--about-transition), color var(--about-transition), transform var(--about-transition), box-shadow var(--about-transition);
}

.page-about .btn--secondary:hover,
.page-about .btn--secondary:focus-visible {
  background: var(--about-gold);
  color: var(--about-dark);
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(212, 175, 55, 0.25);
}

/* ===== 容器 & 通用 ===== */
.page-about .container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.page-about .img-container {
  display: block;
  overflow: hidden;
  border-radius: var(--about-radius-md);
}

.page-about .img-container--wide img {
  width: 100%;
  height: auto;
  display: block;
}

/* ===== 桌面端 (768px+) ===== */
@media (min-width: 768px) {
  .page-about .about-hero {
    padding: 48px 0 72px;
  }

  .page-about .about-hero__grid {
    flex-direction: row;
    align-items: center;
    gap: 48px;
  }

  .page-about .about-hero__text {
    flex: 1 1 50%;
    order: 0;
  }

  .page-about .about-hero__visual {
    flex: 1 1 50%;
    order: 1;
  }

  .page-about .about-hero__title {
    font-size: clamp(48px, 6vw, 72px);
  }

  .page-about .about-hero__desc {
    font-size: 17px;
  }

  .page-about .about-coverage {
    padding: 72px 0;
  }

  .page-about .about-coverage__tags {
    gap: 12px 16px;
  }

  .page-about .about-coverage__tag {
    font-size: 14px;
    padding: 10px 24px;
  }

  .page-about .about-evolution {
    padding: 72px 0;
  }

  .page-about .about-evolution__compare {
    flex-direction: row;
    align-items: stretch;
    gap: 0;
  }

  .page-about .about-evolution__card {
    flex: 1;
    margin-bottom: 0;
    padding: 32px 28px;
  }

  .page-about .about-evolution__card--old {
    border-left: none;
    border-right: 2px solid rgba(139, 0, 0, 0.3);
    border-radius: var(--about-radius-md) 0 0 var(--about-radius-md);
  }

  .page-about .about-evolution__card--new {
    border-left: 2px solid rgba(212, 175, 55, 0.3);
    border-radius: 0 var(--about-radius-md) var(--about-radius-md) 0;
  }

  .page-about .about-evolution__divider {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    flex-shrink: 0;
    position: relative;
    background: var(--about-dark);
  }

  .page-about .about-evolution__divider::before {
    content: '';
    position: absolute;
    top: 0;
    bottom: 0;
    left: 50%;
    width: 2px;
    background: linear-gradient(to bottom, transparent, var(--about-gold), transparent);
    transform: translateX(-50%);
  }

  .page-about .about-evolution__divider-handle {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: var(--about-gold-gradient);
    box-shadow: 0 0 0 4px rgba(212, 175, 55, 0.15), 0 4px 12px rgba(0, 0, 0, 0.3);
    position: relative;
    z-index: 1;
    transition: transform var(--about-transition), box-shadow var(--about-transition);
  }

  .page-about .about-evolution__divider-handle:hover {
    transform: scale(1.1);
    box-shadow: 0 0 0 6px rgba(212, 175, 55, 0.25), 0 6px 20px rgba(0, 0, 0, 0.4);
  }

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

  .page-about .about-evolution__img {
    max-width: 600px;
    margin: 0 auto;
    display: block;
  }

  .page-about .about-support {
    padding: 72px 0 96px;
  }

  .page-about .about-support__card {
    padding: 36px 40px;
    max-width: 640px;
  }

  .page-about .about-support__item {
    flex-direction: row;
    align-items: baseline;
    gap: 16px;
  }

  .page-about .about-support__label {
    min-width: 100px;
    font-size: 12px;
  }

  .page-about .about-support__actions {
    gap: 16px;
  }
}

/* ===== 避免横向溢出 ===== */
.page-about *,
.page-about *::before,
.page-about *::after {
  box-sizing: border-box;
}

.page-about img {
  max-width: 100%;
  height: auto;
}

.page-about .container {
  width: 100%;
  overflow: hidden;
}

/* ===== 辅助 focus 样式 ===== */
.page-about a:focus-visible,
.page-about button:focus-visible,
.page-about .btn:focus-visible {
  outline: 2px solid var(--about-lime);
  outline-offset: 3px;
}