/* ===== 页面专属：品牌档案（page-about） ===== */
.page-about {
  --panel-gap: 2rem;
  --card-radius: var(--radius-md);
  background-color: var(--clr-bg-dark);
  color: var(--clr-text-primary);
  font-family: var(--font-body);
  line-height: 1.6;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: var(--space-md) var(--space-sm) 0;
  font-size: 0.85rem;
  color: var(--clr-text-secondary);
  display: flex;
  align-items: center;
  gap: 0.4rem;
  flex-wrap: wrap;
}
.page-about .breadcrumb a {
  color: var(--clr-gold-accent);
  text-decoration: none;
  transition: color var(--transition-fast);
}
.page-about .breadcrumb a:hover {
  color: var(--clr-primary-orange);
}
.page-about .breadcrumb-sep {
  color: var(--clr-text-secondary);
  font-size: 0.75rem;
}
.page-about .breadcrumb [aria-current="page"] {
  opacity: 0.85;
}

/* ---------- 面板通用 ---------- */
.page-about .panel {
  position: relative;
  padding: var(--space-xl) var(--space-sm);
  overflow: hidden;
}
.page-about .panel__inner {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  position: relative;
  z-index: 2;
}
.page-about .panel__header {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  position: relative;
  z-index: 2;
}
.page-about .panel__title,
.page-about .panel__heading {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.15;
  margin: 0;
}
.page-about .panel__title {
  font-size: clamp(2.2rem, 6vw, 4rem);
  color: var(--clr-text-primary);
}
.page-about .panel__heading {
  font-size: clamp(1.8rem, 5vw, 3rem);
  color: var(--clr-text-primary);
}
.page-about .panel__lead {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--clr-primary-orange);
  max-width: 36rem;
}
.page-about .panel__text {
  max-width: 38rem;
  color: var(--clr-text-secondary);
}
.page-about .panel__sub {
  color: var(--clr-text-secondary);
  margin: var(--space-xs) 0 0;
  font-size: 0.95rem;
  position: relative;
  z-index: 2;
}

/* ---------- 竖向注释 ---------- */
.page-about .vertical-note {
  display: inline-block;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 1.2rem;
  letter-spacing: 0.08em;
  color: var(--clr-primary-orange);
  writing-mode: vertical-rl;
  text-orientation: mixed;
  line-height: 1.2;
  opacity: 0.7;
  flex-shrink: 0;
  width: auto;
  height: 4.5rem;
}

/* ---------- 品牌使命面板 ---------- */
.page-about .mission-panel {
  min-height: 70vh;
  display: flex;
  align-items: center;
  background: linear-gradient(145deg, #0d1b2a 0%, #1b2a4a 60%, #1b2838 100%);
  padding-top: calc(var(--space-xl) + var(--header-height));
  padding-bottom: var(--space-xl);
}
.page-about .mission-panel .panel__inner {
  flex-direction: row;
  align-items: flex-start;
  gap: var(--space-md);
}
.page-about .mission-panel .vertical-note {
  color: var(--clr-gold-accent);
  opacity: 0.9;
  height: 6rem;
}
.page-about .mission-panel .panel__body {
  flex: 1;
}
.page-about .panel__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}
.page-about .panel__bg-img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 30%;
  opacity: 0.25;
  mix-blend-mode: overlay;
}

/* ---------- 服务面板 ---------- */
.page-about .services-panel {
  background: var(--clr-surface-dark);
  position: relative;
  z-index: 1;
  margin-top: -1.5rem;
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  padding-top: var(--space-xl);
}
.page-about .services-panel .panel__header {
  flex-direction: row;
  align-items: flex-start;
  gap: var(--space-sm);
}
.page-about .services-panel .vertical-note {
  color: var(--clr-primary-orange);
  height: 5rem;
}

/* 服务网格 */
.page-about .services-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-md);
  margin-top: var(--space-lg);
  position: relative;
  z-index: 2;
}

/* 服务卡片 (details/summary) */
.page-about .service-card {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 107, 53, 0.15);
  border-radius: var(--card-radius);
  overflow: hidden;
  transition: border-color var(--transition-med), box-shadow var(--transition-med);
}
.page-about .service-card[open] {
  border-color: rgba(255, 107, 53, 0.45);
  box-shadow: 0 8px 32px rgba(255, 107, 53, 0.08);
}
.page-about .service-card__summary {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-md);
  cursor: pointer;
  list-style: none;
  user-select: none;
}
.page-about .service-card__summary::-webkit-details-marker {
  display: none;
}
.page-about .service-card__icon {
  width: 48px;
  height: 48px;
  object-fit: contain;
  border-radius: var(--radius-sm);
  flex-shrink: 0;
  background: rgba(244, 162, 97, 0.1);
  padding: 4px;
}
.page-about .service-card__title {
  flex: 1;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 1.05rem;
  color: var(--clr-text-primary);
}
.page-about .service-card__arrow {
  font-size: 1.3rem;
  font-weight: 300;
  color: var(--clr-gold-accent);
  transition: transform var(--transition-fast);
}
.page-about .service-card[open] .service-card__arrow {
  transform: rotate(45deg);
}
.page-about .service-card__detail {
  padding: 0 var(--space-md) var(--space-md);
  color: var(--clr-text-secondary);
  font-size: 0.92rem;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  border-top: 1px solid rgba(244, 162, 97, 0.12);
  padding-top: var(--space-sm);
}
.page-about .service-card__detail .btn {
  align-self: flex-start;
}

/* ---------- 品质承诺面板 ---------- */
.page-about .quality-panel {
  background: linear-gradient(160deg, #1b2838 0%, #0d1b2a 80%);
  margin-top: -1rem;
  border-radius: var(--radius-lg) 0 0 0;
  padding-top: var(--space-xl);
  position: relative;
  z-index: 0;
}
.page-about .quality-panel .panel__header {
  flex-direction: row;
  align-items: flex-start;
  gap: var(--space-sm);
}
.page-about .quality-panel .vertical-note {
  color: var(--clr-gold-accent);
  height: 5rem;
}
.page-about .quality-content {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
  margin-top: var(--space-md);
  position: relative;
  z-index: 1;
}
.page-about .quality-text {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  max-width: 32rem;
}
.page-about .quality-text p {
  color: var(--clr-text-secondary);
}
.page-about .highlight-year {
  font-family: var(--font-mono);
  color: var(--clr-gold-accent);
  font-weight: 600;
  font-size: 1.1em;
}
.page-about .quality-contact {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  margin-top: var(--space-sm);
  flex-wrap: wrap;
}
.page-about .quality-contact__label {
  color: var(--clr-text-secondary);
  font-size: 0.9rem;
}
.page-about .quality-symbol {
  display: flex;
  justify-content: center;
  align-items: center;
}
.page-about .quality-symbol__img {
  width: 180px;
  height: 180px;
  object-fit: contain;
  border-radius: 50%;
  background: radial-gradient(circle at 30% 30%, rgba(244, 162, 97, 0.2), transparent 70%);
  padding: 16px;
  opacity: 0.9;
}

/* ---------- 按钮 ---------- */
.page-about .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.5rem 1.2rem;
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.85rem;
  text-decoration: none;
  transition: background var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast);
  cursor: pointer;
  border: 2px solid transparent;
  white-space: nowrap;
}
.page-about .btn--sm {
  padding: 0.35rem 1rem;
  font-size: 0.8rem;
}
.page-about .btn-primary {
  background: var(--clr-primary-orange);
  color: #fff;
  border-color: var(--clr-primary-orange);
}
.page-about .btn-primary:hover {
  background: transparent;
  color: var(--clr-primary-orange);
}
.page-about .btn-outline {
  background: transparent;
  color: var(--clr-gold-accent);
  border-color: var(--clr-gold-accent);
}
.page-about .btn-outline:hover {
  background: var(--clr-gold-accent);
  color: var(--clr-bg-dark);
}

/* ---------- 桌面端 (≥768px) ---------- */
@media (min-width: 768px) {
  .page-about {
    --panel-gap: 3rem;
  }
  .page-about .breadcrumb {
    padding-left: var(--space-md);
    padding-right: var(--space-md);
  }
  .page-about .panel {
    padding: var(--space-xl) var(--space-md);
  }
  .page-about .mission-panel {
    min-height: 75vh;
    padding-top: calc(var(--space-xl) * 1.5 + var(--header-height));
  }
  .page-about .mission-panel .vertical-note {
    height: 8rem;
    font-size: 1.4rem;
  }
  .page-about .panel__lead {
    font-size: 1.35rem;
  }

  /* 服务网格 2列 */
  .page-about .services-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-lg);
  }
  .page-about .service-card__icon {
    width: 60px;
    height: 60px;
  }
  .page-about .service-card__title {
    font-size: 1.1rem;
  }

  /* 品质内容左右排 */
  .page-about .quality-content {
    flex-direction: row;
    align-items: center;
    gap: var(--space-xl);
  }
  .page-about .quality-symbol__img {
    width: 240px;
    height: 240px;
  }
  .page-about .quality-text {
    max-width: 36rem;
  }
}

/* ---------- 宽桌面端 (≥1024px) ---------- */
@media (min-width: 1024px) {
  .page-about .panel {
    padding-left: calc((100vw - var(--container-max)) / 2 + var(--space-md));
    padding-right: calc((100vw - var(--container-max)) / 2 + var(--space-md));
  }
  .page-about .services-grid {
    grid-template-columns: 1fr 1fr 1fr;
  }
  .page-about .quality-symbol__img {
    width: 300px;
    height: 300px;
  }
}