.page-about {
  --about-rail-width: 48px;
  --about-orange-glow: rgba(255,107,53,0.15);
  --about-deco-angle: 5deg;
  position: relative;
  background: var(--bg-dark);
  color: var(--text-primary);
  font-family: var(--font-body);
  line-height: 1.6;
  min-height: 100vh;
}

/* ===== 侧边轨道 ===== */
.page-about .about-rail {
  position: fixed;
  left: 0;
  top: 0;
  bottom: 0;
  width: var(--about-rail-width);
  z-index: 50;
  pointer-events: none;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 80px 0 40px;
}
.page-about .about-rail__line {
  position: absolute;
  top: 60px;
  bottom: 20px;
  left: 50%;
  width: 2px;
  background: linear-gradient(180deg, var(--primary-orange) 0%, var(--accent-yellow) 50%, transparent 100%);
  transform: translateX(-50%);
  opacity: 0.5;
}
.page-about .about-rail__dot {
  position: absolute;
  left: 50%;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--highlight-grad);
  transform: translate(-50%, -50%);
  box-shadow: 0 0 16px var(--border-glow);
}
.page-about .about-rail__dot:nth-of-type(1) { top: 8%; }
.page-about .about-rail__dot:nth-of-type(2) { top: 35%; }
.page-about .about-rail__dot:nth-of-type(3) { top: 62%; }
.page-about .about-rail__dot:nth-of-type(4) { top: 88%; }

/* ===== 主内容区 ===== */
.page-about .about-main {
  max-width: var(--max-w);
  margin: 0 auto;
  padding-left: calc(var(--about-rail-width) + 24px);
  padding-right: 24px;
  padding-top: calc(var(--header-h) + 24px);
  padding-bottom: 60px;
}

/* ===== 面包屑 ===== */
.page-about .about-breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: 32px;
  padding-top: 8px;
}
.page-about .about-breadcrumb__link {
  color: var(--primary-orange);
  text-decoration: none;
  transition: color 0.3s;
}
.page-about .about-breadcrumb__link:hover {
  color: var(--accent-yellow);
  text-decoration: underline;
}
.page-about .about-breadcrumb__sep {
  color: var(--text-secondary);
  opacity: 0.5;
}
.page-about .about-breadcrumb__current {
  color: var(--text-secondary);
  font-weight: var(--weight-body);
}

/* ===== 首屏 ===== */
.page-about .about-hero {
  margin-bottom: 64px;
  position: relative;
}
.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  align-items: center;
}
.page-about .about-hero__image-wrap {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  transform: rotate(var(--about-deco-angle));
  box-shadow: 12px 12px 0 var(--about-orange-glow);
}
.page-about .about-hero__image {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 7 / 5;
  border-radius: var(--radius-lg);
}
.page-about .about-hero__image-accent {
  position: absolute;
  inset: 0;
  border: 2px solid var(--primary-orange);
  border-radius: var(--radius-lg);
  opacity: 0.25;
  pointer-events: none;
}
.page-about .about-hero__content {
  padding: 16px 0;
}
.page-about .about-hero__title {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: 2rem;
  line-height: 1.2;
  margin: 0 0 16px;
  background: var(--highlight-grad);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.page-about .about-hero__desc {
  font-size: 1.0625rem;
  color: var(--text-secondary);
  margin: 0 0 28px;
  max-width: 600px;
  line-height: 1.7;
}
.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}
.page-about .about-hero__btn {
  font-family: var(--font-body);
  font-weight: 600;
  text-transform: none;
  letter-spacing: 0;
}
.page-about .about-hero__motto {
  display: flex;
  align-items: center;
  gap: 20px;
  margin-top: 40px;
  padding: 20px 0 0;
  border-top: 1px solid rgba(255,255,255,0.06);
}
.page-about .about-hero__motto p {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 1.125rem;
  color: var(--accent-yellow);
  margin: 0;
  white-space: nowrap;
  letter-spacing: 2px;
}
.page-about .about-hero__motto-line {
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--primary-orange), transparent);
  opacity: 0.3;
}

/* ===== 通用板块标题 ===== */
.page-about .about-section-title {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: 1.75rem;
  color: var(--text-primary);
  margin: 0 0 8px;
  padding-left: 16px;
  border-left: 4px solid var(--primary-orange);
}

/* ===== 核心功能 ===== */
.page-about .about-features {
  margin-bottom: 72px;
  padding-top: 16px;
}
.page-about .about-features__intro {
  color: var(--text-secondary);
  font-size: 1rem;
  margin: 0 0 36px 20px;
  max-width: 600px;
}
.page-about .about-features__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
}

/* 功能卡片 */
.page-about .about-feature {
  background: var(--bg-card);
  border-radius: var(--radius-md);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  border: 1px solid rgba(255,255,255,0.05);
  transition: transform 0.4s ease, box-shadow 0.4s ease, border-color 0.3s ease;
  cursor: default;
  clip-path: polygon(0 0, 100% 0, calc(100% - 16px) 100%, 0 100%);
}
.page-about .about-feature:hover {
  transform: translateY(-6px);
  box-shadow: 0 16px 40px rgba(255,107,53,0.18);
  border-color: var(--border-glow);
}
.page-about .about-feature__visual {
  position: relative;
  overflow: hidden;
  aspect-ratio: 1 / 1;
}
.page-about .about-feature__img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}
.page-about .about-feature:hover .about-feature__img {
  transform: scale(1.05);
}
.page-about .about-feature__badge {
  position: absolute;
  top: 12px;
  left: 12px;
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: 1.25rem;
  color: var(--primary-dark);
  background: var(--highlight-grad);
  padding: 2px 12px;
  border-radius: var(--radius-sm);
  line-height: 1.4;
}
.page-about .about-feature__body {
  padding: 20px 20px 24px;
  flex: 1;
  display: flex;
  flex-direction: column;
}
.page-about .about-feature__title {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: 1.25rem;
  color: var(--text-primary);
  margin: 0 0 8px;
}
.page-about .about-feature__desc {
  color: var(--text-secondary);
  font-size: 0.9375rem;
  margin: 0 0 16px;
  line-height: 1.6;
  flex: 1;
}
.page-about .about-feature__detail {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding-top: 12px;
  border-top: 1px solid rgba(255,255,255,0.06);
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  transition: max-height 0.4s ease, opacity 0.4s ease, padding 0.4s ease;
}
.page-about .about-feature:hover .about-feature__detail {
  max-height: 120px;
  opacity: 1;
  padding-top: 12px;
}
.page-about .about-feature__detail-item {
  font-size: 0.8125rem;
  color: var(--accent-yellow);
  background: rgba(255,209,102,0.12);
  padding: 4px 14px;
  border-radius: 20px;
  border: 1px solid rgba(255,209,102,0.2);
}

/* ===== 为什么选择我们 ===== */
.page-about .about-why {
  margin-bottom: 64px;
  padding-top: 16px;
}
.page-about .about-timeline {
  position: relative;
  margin: 40px 0 48px;
  padding-left: 32px;
}
.page-about .about-timeline__track {
  position: absolute;
  left: 10px;
  top: 0;
  bottom: 0;
  width: 3px;
  background: linear-gradient(180deg, var(--primary-orange) 0%, var(--accent-yellow) 60%, transparent 100%);
  border-radius: 4px;
  opacity: 0.35;
}
.page-about .about-timeline__items {
  display: flex;
  flex-direction: column;
  gap: 40px;
}
.page-about .about-timeline__item {
  position: relative;
  display: flex;
  gap: 24px;
  align-items: flex-start;
}
.page-about .about-timeline__dot {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--highlight-grad);
  margin-left: -37px;
  margin-top: 6px;
  box-shadow: 0 0 20px var(--border-glow);
  z-index: 2;
  border: 3px solid var(--bg-dark);
}
.page-about .about-timeline__content {
  background: var(--bg-card);
  border-radius: var(--radius-md);
  padding: 20px 24px;
  flex: 1;
  border: 1px solid rgba(255,255,255,0.04);
  transition: box-shadow 0.3s ease, border-color 0.3s ease;
  clip-path: polygon(0 0, 100% 0, calc(100% - 12px) 100%, 0 100%);
}
.page-about .about-timeline__content:hover {
  box-shadow: 0 8px 28px rgba(255,107,53,0.12);
  border-color: var(--border-glow);
}
.page-about .about-timeline__tag {
  display: inline-block;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--primary-orange);
  background: rgba(255,107,53,0.1);
  padding: 2px 14px;
  border-radius: 20px;
  margin-bottom: 8px;
  letter-spacing: 1px;
}
.page-about .about-timeline__title {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: 1.2rem;
  color: var(--text-primary);
  margin: 0 0 8px;
}
.page-about .about-timeline__desc {
  color: var(--text-secondary);
  font-size: 0.9375rem;
  margin: 0;
  line-height: 1.65;
}

/* ===== 48小时进度条 ===== */
.page-about .about-progress {
  background: var(--bg-card);
  border-radius: var(--radius-md);
  padding: 28px 32px;
  margin-top: 16px;
  border: 1px solid rgba(255,255,255,0.04);
  clip-path: polygon(0 0, 100% 0, calc(100% - 20px) 100%, 0 100%);
}
.page-about .about-progress__header {
  display: flex;
  justify-content: space-between;
  font-size: 0.8125rem;
  color: var(--text-secondary);
  margin-bottom: 12px;
}
.page-about .about-progress__label {
  font-weight: 500;
}
.page-about .about-progress__track {
  height: 10px;
  background: rgba(255,255,255,0.06);
  border-radius: 20px;
  overflow: hidden;
  position: relative;
}
.page-about .about-progress__bar {
  display: block;
  height: 100%;
  background: var(--highlight-grad);
  border-radius: 20px;
  width: 0;
  animation: aboutProgressFill 3s ease-in-out forwards;
  box-shadow: 0 0 20px var(--border-glow);
}
@keyframes aboutProgressFill {
  0% { width: 0; }
  60% { width: 72%; }
  100% { width: 100%; }
}
.page-about .about-progress__footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 12px;
}
.page-about .about-progress__time {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: 0.9375rem;
  color: var(--text-secondary);
}
.page-about .about-progress__tag {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--accent-yellow);
  background: rgba(255,209,102,0.1);
  padding: 2px 16px;
  border-radius: 20px;
  border: 1px solid rgba(255,209,102,0.2);
}

/* ===== 信任区 ===== */
.page-about .about-trust {
  margin-top: 24px;
}
.page-about .about-trust__inner {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: 40px 32px;
  text-align: center;
  border: 1px solid rgba(255,255,255,0.04);
  position: relative;
  overflow: hidden;
}
.page-about .about-trust__inner::before {
  content: '';
  position: absolute;
  top: -60px;
  right: -60px;
  width: 160px;
  height: 160px;
  background: radial-gradient(circle, var(--about-orange-glow) 0%, transparent 70%);
  pointer-events: none;
}
.page-about .about-trust__icon {
  margin: 0 auto 20px;
  width: 64px;
  height: 64px;
}
.page-about .about-trust__text {
  color: var(--text-secondary);
  font-size: 1rem;
  line-height: 1.7;
  max-width: 680px;
  margin: 0 auto 24px;
}
.page-about .about-trust__links {
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

/* ===== 桌面端 ===== */
@media (min-width: 768px) {
  .page-about .about-hero__grid {
    grid-template-columns: 1fr 1fr;
    gap: 48px;
  }
  .page-about .about-hero__title {
    font-size: 2.625rem;
  }
  .page-about .about-hero__image-wrap {
    transform: rotate(3deg);
  }
  .page-about .about-features__grid {
    grid-template-columns: 1fr 1fr 1fr;
    gap: 24px;
  }
  .page-about .about-feature {
    clip-path: polygon(0 0, 100% 0, calc(100% - 20px) 100%, 0 100%);
  }
  .page-about .about-section-title {
    font-size: 2rem;
  }
  .page-about .about-timeline__content {
    clip-path: polygon(0 0, 100% 0, calc(100% - 24px) 100%, 0 100%);
  }
  .page-about .about-progress {
    padding: 32px 48px;
  }
  .page-about .about-trust__inner {
    padding: 48px 64px;
  }
  .page-about .about-main {
    padding-left: calc(var(--about-rail-width) + 48px);
    padding-right: 40px;
  }
}

@media (min-width: 1024px) {
  .page-about .about-hero__title {
    font-size: 3rem;
  }
  .page-about .about-hero__desc {
    font-size: 1.125rem;
  }
  .page-about .about-features__grid {
    gap: 32px;
  }
}

@media (max-width: 767px) {
  .page-about .about-rail {
    width: 24px;
    opacity: 0.3;
  }
  .page-about .about-rail__dot {
    width: 8px;
    height: 8px;
  }
  .page-about .about-main {
    padding-left: 36px;
    padding-right: 16px;
  }
  .page-about .about-hero__title {
    font-size: 1.625rem;
  }
  .page-about .about-hero__motto p {
    font-size: 0.9375rem;
    letter-spacing: 1px;
  }
  .page-about .about-timeline {
    padding-left: 24px;
  }
  .page-about .about-timeline__dot {
    margin-left: -29px;
    width: 16px;
    height: 16px;
  }
  .page-about .about-timeline__content {
    padding: 16px 18px;
  }
  .page-about .about-progress {
    padding: 20px 18px;
  }
  .page-about .about-trust__inner {
    padding: 28px 18px;
  }
}