/* =============================================
   PAGE-SPECIFIC: 品牌故事 (about)
   所有选择器限定在 .page-about 作用域内
   ============================================= */
.page-about {
  --page-accent-red: var(--color-accent-red, #E63946);
  --page-accent-gold: var(--color-accent-gold, #F4A261);
  --page-primary-bg: var(--color-primary-bg, #0A1F44);
  --page-secondary-bg: var(--color-secondary-bg, #1B2A4A);
  --page-text-white: var(--color-text-white, #FFFFFF);
  --page-text-light: var(--color-text-light, #B0C4DE);
  --page-data-font: var(--color-data-font, #00FFC6);
  --page-border-line: var(--color-border-line, #2A3F66);
  --page-font-headings: var(--font-headings, 'Inter', sans-serif);
  --page-font-body: var(--font-body, 'Noto Sans SC', sans-serif);
  --page-font-data: var(--font-data, 'JetBrains Mono', monospace);

  display: block;
  background: var(--page-primary-bg);
  color: var(--page-text-white);
  font-family: var(--page-font-body);
  line-height: 1.5;
  padding-top: var(--spacing-xl, 4rem);
  padding-bottom: var(--spacing-xl, 4rem);
}

.page-about__inner {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xl, 4rem);
}

/* 面包屑 */
.page-about__breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs, 0.25rem);
  font-size: 0.875rem;
  color: var(--page-text-light);
  flex-wrap: wrap;
}

.page-about__breadcrumb-link {
  color: var(--page-text-light);
  text-decoration: none;
  transition: color var(--transition-base, 0.25s ease);
}

.page-about__breadcrumb-link:hover {
  color: var(--color-link-hover, #FF6B6B);
}

.page-about__breadcrumb-sep {
  margin: 0 var(--spacing-xs, 0.25rem);
  color: var(--page-border-line);
}

.page-about__breadcrumb-current {
  font-weight: 600;
  color: var(--page-text-white);
}

/* 主标题 */
.page-about__headline {
  font-family: var(--page-font-headings);
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-size: clamp(1.75rem, 5vw, 3rem);
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs, 0.25rem);
}

.page-about__headline-sub {
  display: block;
  font-size: 0.6em;
  font-weight: 400;
  color: var(--page-accent-gold);
  letter-spacing: 0.15em;
  text-transform: none;
}

/* 筛选按钮 */
.page-about__filters {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm, 0.5rem);
}

.page-about__filter {
  cursor: pointer;
  background: var(--page-secondary-bg);
  border: 1px solid var(--page-border-line);
  color: var(--page-text-light);
  padding: var(--spacing-sm, 0.5rem) var(--spacing-md, 1rem);
  font-family: var(--page-font-headings);
  font-size: 0.875rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  transition: background var(--transition-base, 0.25s ease), color var(--transition-base, 0.25s ease), border-color var(--transition-base, 0.25s ease);
}

.page-about__filter[aria-selected="true"],
.page-about__filter:hover,
.page-about__filter:focus-visible {
  background: var(--page-accent-red);
  color: var(--page-text-white);
  border-color: var(--page-accent-red);
}

/* ---------- 区块通用 ---------- */
.page-about__section {
  background: var(--page-secondary-bg);
  padding: var(--spacing-lg, 2rem);
  border: 1px solid var(--page-border-line);
  position: relative;
  /* 展览标签风格：左上角装饰 */
}

.page-about__section::before {
  content: '';
  position: absolute;
  top: -1px;
  left: -1px;
  width: 60px;
  height: 4px;
  background: var(--page-accent-gold);
}

.page-about__section-header {
  margin-bottom: var(--spacing-lg, 2rem);
}

/* 区块内标题 */
.page-about__section-title {
  font-family: var(--page-font-headings);
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: clamp(1.25rem, 3vw, 2rem);
  margin: 0 0 var(--spacing-sm, 0.5rem);
  color: var(--page-text-white);
  position: relative;
  display: inline-block;
}

.page-about__section-title::after {
  content: '';
  display: block;
  width: 50%;
  height: 3px;
  background: var(--page-accent-gold);
  margin-top: var(--spacing-xs, 0.25rem);
  transition: width 0.3s ease;
}

.page-about__section:hover .page-about__section-title::after {
  width: 100%;
}

.page-about__section-desc {
  color: var(--page-text-light);
  max-width: 600px;
  margin: 0 0 var(--spacing-md, 1rem);
}

/* 区块内cta按钮 */
.page-about__cta {
  margin-top: var(--spacing-md, 1rem);
}

/* ---------- 品牌定位（首屏） ---------- */
.page-about__section--positioning .page-about__section-inner {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg, 2rem);
}

.page-about__section--positioning .page-about__section-media {
  width: 100%;
}

.page-about__hero-img {
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border: 1px solid var(--page-border-line);
  display: block;
}

@media (min-width: 768px) {
  .page-about__section--positioning .page-about__section-inner {
    flex-direction: row;
    align-items: center;
  }

  .page-about__section--positioning .page-about__section-text {
    flex: 1 1 45%;
  }

  .page-about__section--positioning .page-about__section-media {
    flex: 1 1 55%;
  }

  .page-about__hero-img {
    height: 400px;
    object-fit: cover;
  }
}

@media (min-width: 1024px) {
  .page-about__hero-img {
    height: 500px;
  }
}

/* ---------- 内容战略 ---------- */
.page-about__strategy-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-md, 1rem);
  margin-bottom: var(--spacing-lg, 2rem);
}

.page-about__strategy-card {
  background: var(--page-primary-bg);
  border: 1px solid var(--page-border-line);
  padding: var(--spacing-md, 1rem);
}

.page-about__strategy-card .card__title {
  font-family: var(--page-font-headings);
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  font-size: 1.125rem;
  margin: 0 0 var(--spacing-xs, 0.25rem);
  color: var(--page-text-white);
}

.page-about__strategy-card .card__meta {
  color: var(--page-data-font);
  font-family: var(--page-font-data);
  font-size: 0.875rem;
  margin: 0 0 var(--spacing-sm, 0.5rem);
}

.page-about__strategy-card .card__desc {
  color: var(--page-text-light);
  font-size: 0.9375rem;
  margin: 0 0 var(--spacing-md, 1rem);
}

.page-about__strategy-visual {
  width: 100%;
  max-width: 600px;
  margin: 0 auto;
}

.page-about__strategy-img {
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: contain;
  border: 1px solid var(--page-border-line);
}

@media (min-width: 640px) {
  .page-about__strategy-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 1024px) {
  .page-about__strategy-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* ---------- 服务承诺 ---------- */
.page-about__commitment-layout {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg, 2rem);
}

.page-about__commitment-list {
  list-style: none;
  padding: 0;
  margin: 0 0 var(--spacing-md, 1rem);
}

.page-about__commitment-item {
  padding: var(--spacing-sm, 0.5rem) 0;
  border-bottom: 1px solid var(--page-border-line);
  color: var(--page-text-light);
  font-size: 1rem;
}

.page-about__commitment-item strong {
  color: var(--page-accent-gold);
  font-weight: 700;
}

.page-about__commitment-note {
  font-size: 0.875rem;
  color: var(--page-text-light);
  margin: var(--spacing-md, 1rem) 0;
  font-style: italic;
}

.page-about__commitment-visual {
  width: 100%;
  max-width: 800px;
}

.page-about__commitment-img {
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: contain;
  border: 1px solid var(--page-border-line);
}

@media (min-width: 768px) {
  .page-about__commitment-layout {
    flex-direction: row;
    align-items: flex-start;
  }

  .page-about__commitment-text {
    flex: 1 1 45%;
  }

  .page-about__commitment-visual {
    flex: 1 1 55%;
  }
}

/* ---------- 信任声明 ---------- */
.page-about__trust-statement {
  padding: var(--spacing-md, 1rem) var(--spacing-lg, 2rem);
  border: 1px dashed var(--page-border-line);
  background: var(--page-primary-bg);
  text-align: center;
}

.page-about__trust-text {
  margin: 0;
  font-size: 0.875rem;
  color: var(--page-text-light);
  line-height: 1.6;
}

/* ---------- 响应式微调 ---------- */
@media (max-width: 767px) {
  .page-about {
    padding-top: var(--spacing-lg, 2rem);
    padding-bottom: var(--spacing-lg, 2rem);
  }

  .page-about__section {
    padding: var(--spacing-md, 1rem);
  }

  .page-about__filters {
    justify-content: center;
  }
}

@media (min-width: 1200px) {
  .page-about__inner {
    max-width: var(--container-max, 1200px);
    margin: 0 auto;
  }
}

/* ---------- 筛选隐藏（配合JS，渐进增强） ---------- */
.page-about__section[data-filter-tags] {
  transition: opacity 0.3s ease, transform 0.3s ease;
}

.page-about__section[data-filter-tags][data-hidden] {
  opacity: 0.2;
  transform: scale(0.98);
  pointer-events: none;
}

/* 确保筛选后仍可读 */
@media (prefers-reduced-motion: reduce) {
  .page-about__section[data-filter-tags][data-hidden] {
    opacity: 0.4;
  }
}