/* ===== page-about 专属样式 ===== */
.page-about {
  --about-hero-bg: var(--color-secondary);
  --about-accent-line: var(--color-primary);
  --about-stack-shadow: 0 4px 12px rgba(29,53,87,0.10), 0 8px 24px rgba(29,53,87,0.06), 0 1px 2px rgba(29,53,87,0.08);
  --about-stack-shadow-hover: 0 8px 24px rgba(29,53,87,0.14), 0 12px 36px rgba(29,53,87,0.10);
  --about-card-border: 2px solid rgba(29,53,87,0.12);
  --about-timeline-line: var(--color-accent);
  --about-index-bg: rgba(241,250,238,0.60);
  color: var(--color-text);
  font-family: var(--font-body);
}

/* ---- Hero 区域 ---- */
.about-hero {
  background: var(--about-hero-bg);
  padding: 48px 20px 32px;
  position: relative;
  overflow: hidden;
}
.about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(
    -8deg,
    transparent,
    transparent 40px,
    rgba(230,57,70,0.06) 40px,
    rgba(230,57,70,0.06) 41px
  );
  pointer-events: none;
}
.about-hero__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  gap: 32px 48px;
  align-items: center;
  position: relative;
  z-index: 1;
}
.about-hero__logo {
  flex: 0 0 200px;
  text-align: center;
  position: relative;
}
.about-hero__logo-img {
  width: 200px;
  height: 200px;
  display: block;
  border-radius: 4px;
  box-shadow: 0 0 0 4px rgba(244,162,97,0.25), 0 12px 32px rgba(0,0,0,0.20);
  transition: transform var(--transition-base);
  max-width: 100%;
  height: auto;
  object-fit: contain;
  background: var(--color-bg);
}
.about-hero__logo-img:hover {
  transform: scale(1.02);
}
.about-hero__logo-badge {
  display: inline-block;
  margin-top: 8px;
  font-size: 0.7rem;
  font-family: var(--font-heading);
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--color-accent);
  background: rgba(0,0,0,0.25);
  padding: 2px 10px;
  border-radius: 12px;
  text-transform: uppercase;
}
.about-hero__text {
  flex: 1;
  min-width: 240px;
}
.about-hero__chapter-label {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--color-accent);
  background: rgba(244,162,97,0.15);
  padding: 2px 12px;
  border-radius: 12px;
  margin-bottom: 12px;
  text-transform: uppercase;
}
.about-hero__title {
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: clamp(2rem, 5vw, 3.2rem);
  line-height: 1.1;
  color: var(--color-bg);
  margin: 0 0 8px;
}
.about-hero__title-accent {
  color: var(--color-accent);
  font-weight: 700;
}
.about-hero__subtitle {
  font-size: 1rem;
  color: rgba(255,255,255,0.80);
  margin: 0 0 24px;
  max-width: 520px;
  line-height: 1.5;
}
.about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}
.about-hero__actions .btn {
  font-size: 0.85rem;
  padding: 10px 22px;
}
.about-hero__actions .btn-primary {
  background: var(--color-primary);
  color: var(--color-bg);
  border: none;
}
.about-hero__actions .btn-outline {
  background: transparent;
  color: var(--color-bg);
  border: 2px solid rgba(255,255,255,0.40);
}
.about-hero__actions .btn-outline:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

/* ---- 页面主体布局 ---- */
.about-body {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 40px 20px 64px;
  display: flex;
  gap: 40px;
  position: relative;
}

/* ---- 侧边目录导航 (桌面) ---- */
.about-index {
  flex: 0 0 180px;
  position: sticky;
  top: 96px;
  align-self: flex-start;
  background: var(--about-index-bg);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  border-radius: 4px;
  padding: 20px 16px;
  border-left: 3px solid var(--color-primary);
  box-shadow: 0 1px 4px rgba(0,0,0,0.04);
}
.about-index__label {
  display: block;
  font-size: 0.65rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-text-muted);
  margin-bottom: 16px;
}
.about-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.about-index__link {
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--color-text);
  padding: 6px 8px;
  border-radius: 4px;
  transition: background var(--transition-fast), color var(--transition-fast);
}
.about-index__link:hover {
  background: rgba(230,57,70,0.08);
  color: var(--color-primary);
}
.about-index__link:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}
.about-index__num {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.8rem;
  color: var(--color-accent);
  width: 24px;
  text-align: right;
}
.about-index__decoration {
  margin-top: 20px;
  height: 2px;
  background: linear-gradient(90deg, var(--color-primary), transparent);
  opacity: 0.30;
}

/* ---- 内容区 ---- */
.about-content {
  flex: 1;
  min-width: 0;
}

/* ---- 通用章节结构 ---- */
.about-section {
  margin-bottom: 56px;
  scroll-margin-top: 80px;
}
.about-section__header {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 12px 16px;
  margin-bottom: 24px;
  border-bottom: 2px solid var(--color-border);
  padding-bottom: 12px;
}
.about-section__number {
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 1.8rem;
  line-height: 1;
  color: var(--color-primary);
  opacity: 0.30;
  letter-spacing: -0.03em;
}
.about-section__header .section-title {
  margin: 0;
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--color-text);
  flex: 1;
}
.about-section__desc {
  width: 100%;
  margin: 4px 0 0;
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

/* ---- 品牌简介卡片 ---- */
.about-section--brand .about-section__body {
  display: flex;
  flex-wrap: wrap;
  gap: 24px 32px;
}
.about-card--stacked {
  flex: 1;
  min-width: 280px;
  position: relative;
  background: var(--color-card-bg);
  border: var(--about-card-border);
  box-shadow: var(--about-stack-shadow);
  transition: box-shadow var(--transition-base), transform var(--transition-base);
  transform: rotate(-0.3deg);
}
.about-card--stacked:hover {
  box-shadow: var(--about-stack-shadow-hover);
  transform: rotate(0deg);
}
.about-card--stacked::before {
  content: "";
  position: absolute;
  inset: -4px -4px 8px 8px;
  border: 2px solid rgba(29,53,87,0.06);
  border-radius: 2px;
  z-index: -1;
  background: var(--color-bg);
}
.about-card--stacked::after {
  content: "";
  position: absolute;
  inset: 8px 8px -4px -4px;
  border: 2px solid rgba(230,57,70,0.08);
  border-radius: 2px;
  z-index: -2;
  background: rgba(241,250,238,0.50);
}
.about-card__header {
  display: flex;
  gap: 8px;
  padding: 16px 20px 0;
  flex-wrap: wrap;
}
.tag {
  background: var(--color-accent);
  color: var(--color-secondary);
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 2px 10px;
  border-radius: 12px;
}
.about-tag--alt {
  background: var(--color-primary);
  color: var(--color-bg);
}
.about-card__body {
  padding: 16px 20px 24px;
}
.about-card__lead {
  font-size: 1rem;
  line-height: 1.6;
  margin: 0 0 20px;
  color: var(--color-text);
}
.about-card__lead strong {
  color: var(--color-primary);
  font-weight: 700;
}
.about-card__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
  gap: 16px;
  margin-bottom: 16px;
}
.about-card__stat {
  text-align: center;
  padding: 12px 8px;
  background: var(--color-bg);
  border-radius: 4px;
  border: 1px solid var(--color-border);
}
.about-card__stat-num {
  display: block;
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 1.3rem;
  color: var(--color-primary);
}
.about-card__stat-label {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  line-height: 1.3;
  display: block;
  margin-top: 4px;
}
.about-card__note {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  margin: 0;
  padding-top: 12px;
  border-top: 1px dashed var(--color-border);
}
.about-card__stamp {
  position: absolute;
  bottom: 16px;
  right: 20px;
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 2.2rem;
  color: rgba(230,57,70,0.06);
  line-height: 1;
  pointer-events: none;
  letter-spacing: 0.1em;
  user-select: none;
}
.about-section__image {
  flex: 0 0 360px;
  min-width: 240px;
}
.about-section__img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 4px;
  border: var(--about-card-border);
  box-shadow: 0 4px 16px rgba(0,0,0,0.06);
  object-fit: cover;
  aspect-ratio: 2 / 1;
  max-width: 100%;
}

/* ---- 服务特色网格 ---- */
.about-features__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 20px;
}
.about-feature {
  padding: 24px 20px 20px;
  background: var(--color-card-bg);
  border: var(--about-card-border);
  box-shadow: var(--shadow-card);
  transition: box-shadow var(--transition-base), transform var(--transition-base);
  display: flex;
  flex-direction: column;
}
.about-feature:hover {
  box-shadow: var(--shadow-card-hover);
  transform: translateY(-3px);
}
.about-feature__icon {
  margin-bottom: 12px;
  width: 48px;
  height: 48px;
}
.about-feature__icon svg {
  width: 48px;
  height: 48px;
  display: block;
}
.about-feature__title {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.15rem;
  margin: 0 0 8px;
  color: var(--color-secondary);
}
.about-feature__summary {
  font-size: 0.9rem;
  color: var(--color-text);
  margin: 0 0 12px;
  line-height: 1.5;
  flex: 1;
}
.about-feature__detail {
  margin-top: auto;
  font-size: 0.85rem;
}
.about-feature__detail-btn {
  display: inline-block;
  font-weight: 600;
  color: var(--color-primary);
  cursor: pointer;
  padding: 4px 0;
  border-bottom: 2px solid transparent;
  transition: border-color var(--transition-fast);
  list-style: none;
}
.about-feature__detail-btn::-webkit-details-marker {
  display: none;
}
.about-feature__detail-btn::marker {
  content: "";
}
.about-feature__detail-btn:hover {
  border-bottom-color: var(--color-primary);
}
.about-feature__detail-body {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px dashed var(--color-border);
  line-height: 1.5;
  color: var(--color-text);
}
.about-feature__detail-body p {
  margin: 0 0 8px;
}
.about-feature__list {
  margin: 8px 0 0;
  padding: 0 0 0 18px;
  list-style: square;
  color: var(--color-text-muted);
}
.about-feature__list li {
  margin-bottom: 4px;
}

/* ---- 时间线 ---- */
.about-timeline {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 0;
  padding-left: 28px;
}
.about-timeline::before {
  content: "";
  position: absolute;
  top: 16px;
  bottom: 16px;
  left: 10px;
  width: 2px;
  background: linear-gradient(180deg, var(--color-accent), var(--color-primary), var(--color-secondary));
  opacity: 0.30;
}
.about-timeline__item {
  position: relative;
  padding-bottom: 28px;
}
.about-timeline__item:last-child {
  padding-bottom: 0;
}
.about-timeline__dot {
  position: absolute;
  left: -22px;
  top: 6px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--color-accent);
  border: 3px solid var(--color-bg);
  box-shadow: 0 0 0 2px rgba(244,162,97,0.30);
  z-index: 1;
}
.about-timeline__content {
  background: var(--color-card-bg);
  border: var(--about-card-border);
  padding: 16px 20px;
  box-shadow: var(--shadow-card);
  transition: box-shadow var(--transition-base);
  border-left: 3px solid var(--color-accent);
}
.about-timeline__content:hover {
  box-shadow: var(--shadow-card-hover);
}
.about-timeline__content .tag {
  margin-bottom: 6px;
  display: inline-block;
}
.about-timeline__title {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1rem;
  margin: 4px 0 6px;
  color: var(--color-secondary);
}
.about-timeline__text {
  font-size: 0.85rem;
  color: var(--color-text);
  margin: 0;
  line-height: 1.5;
}

/* ---- 联系方式 ---- */
.about-contact__grid {
  display: flex;
  flex-wrap: wrap;
  gap: 24px 32px;
  align-items: stretch;
}
.about-contact__info {
  flex: 1;
  min-width: 300px;
  background: var(--color-card-bg);
  border: var(--about-card-border);
  box-shadow: var(--shadow-card);
}
.about-contact__info-header {
  padding: 16px 20px 0;
}
.about-contact__info .card__body {
  padding: 16px 20px 20px;
}
.about-contact__item {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 12px;
  padding: 10px 0;
  border-bottom: 1px solid var(--color-border);
}
.about-contact__item:last-of-type {
  border-bottom: none;
}
.about-contact__label {
  font-weight: 600;
  font-size: 0.8rem;
  color: var(--color-text-muted);
  min-width: 80px;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}
.about-contact__value {
  font-size: 0.95rem;
  color: var(--color-text);
  word-break: break-all;
}
a.about-contact__value {
  text-decoration: none;
  color: var(--color-primary);
  font-weight: 500;
  transition: color var(--transition-fast);
}
a.about-contact__value:hover {
  color: var(--color-primary-dark);
  text-decoration: underline;
}
.about-contact__note {
  font-size: 0.78rem;
  color: var(--color-text-muted);
  margin: 12px 0 0;
  font-style: italic;
}
.about-contact__image-wrap {
  flex: 0 0 200px;
  min-width: 160px;
  display: flex;
  align-items: center;
}
.about-contact__img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 4px;
  border: var(--about-card-border);
  box-shadow: var(--shadow-card);
  aspect-ratio: 1 / 1;
  object-fit: cover;
  max-width: 100%;
}

/* ---- 品牌信任声明 ---- */
.about-trust {
  margin-top: 40px;
  padding: 16px 20px;
  background: var(--color-secondary);
  border-radius: 4px;
  color: var(--color-bg);
}
.about-trust__inner {
  display: flex;
  align-items: center;
  gap: 12px;
  max-width: 720px;
}
.about-trust__icon {
  flex-shrink: 0;
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--color-accent);
  line-height: 1;
}
.about-trust__text {
  font-size: 0.82rem;
  margin: 0;
  line-height: 1.5;
  opacity: 0.92;
}

/* ---- 响应式 ---- */

/* 平板及以下 */
@media (max-width: 920px) {
  .about-body {
    flex-direction: column;
    gap: 24px;
  }
  .about-index {
    position: static;
    flex: none;
    width: 100%;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 8px 16px;
    padding: 12px 16px;
    border-left: none;
    border-bottom: 3px solid var(--color-primary);
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
  }
  .about-index__label {
    margin-bottom: 0;
    font-size: 0.7rem;
  }
  .about-index__list {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 4px 12px;
  }
  .about-index__decoration {
    display: none;
  }
  .about-index__num {
    width: auto;
    font-size: 0.7rem;
  }
  .about-section__image {
    flex: 1 1 100%;
  }
  .about-contact__image-wrap {
    flex: 1 1 100%;
    max-width: 320px;
  }
}

/* 手机窄屏 */
@media (max-width: 640px) {
  .about-hero {
    padding: 32px 16px 28px;
  }
  .about-hero__inner {
    flex-direction: column;
    text-align: center;
  }
  .about-hero__logo {
    flex: 0 0 auto;
  }
  .about-hero__logo-img {
    width: 140px;
    height: 140px;
    margin: 0 auto;
  }
  .about-hero__text {
    text-align: center;
  }
  .about-hero__subtitle {
    margin-left: auto;
    margin-right: auto;
  }
  .about-hero__actions {
    justify-content: center;
  }
  .about-body {
    padding: 24px 12px 48px;
  }
  .about-index {
    flex-wrap: wrap;
    justify-content: center;
    padding: 10px 12px;
  }
  .about-index__list {
    justify-content: center;
  }
  .about-section__header .section-title {
    font-size: 1.25rem;
  }
  .about-section__number {
    font-size: 1.4rem;
  }
  .about-features__grid {
    grid-template-columns: 1fr;
  }
  .about-card__grid {
    grid-template-columns: 1fr 1fr;
  }
  .about-card--stacked {
    transform: none;
  }
  .about-card--stacked:hover {
    transform: none;
  }
  .about-card--stacked::before,
  .about-card--stacked::after {
    display: none;
  }
  .about-timeline {
    padding-left: 20px;
  }
  .about-timeline__dot {
    left: -16px;
    width: 12px;
    height: 12px;
  }
  .about-contact__grid {
    flex-direction: column;
  }
  .about-contact__image-wrap {
    max-width: 100%;
  }
  .about-trust__inner {
    flex-direction: column;
    text-align: center;
  }
}