/* ===== 品牌概况页专属样式 (page-about) ===== */
.page-about {
  --about-hero-min-height: 420px;
  --about-toc-width: 200px;
  --about-content-max-width: 820px;
  --about-card-bg: rgba(17, 34, 64, 0.7);
  --about-accent-glow: 0 0 20px rgba(0, 255, 135, 0.25);
  display: block;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
}

/* ===== 首屏导语区 ===== */
.about-hero {
  position: relative;
  min-height: var(--about-hero-min-height);
  display: flex;
  align-items: flex-end;
  background-size: cover;
  background-position: center 30%;
  background-repeat: no-repeat;
  overflow: hidden;
}
.about-hero__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(11, 29, 58, 0.3) 0%, rgba(11, 29, 58, 0.85) 70%, var(--color-bg) 100%);
  z-index: 1;
}
.about-hero__inner {
  position: relative;
  z-index: 2;
  width: 100%;
  padding: 2.5rem 1.25rem 2rem;
}
.about-hero .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 0.375rem 0.625rem;
  font-size: 0.8125rem;
  color: var(--color-text-secondary);
  margin-bottom: 1.25rem;
}
.about-hero .breadcrumb-item a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color 0.2s;
}
.about-hero .breadcrumb-item a:hover {
  color: var(--color-accent2);
}
.about-hero .breadcrumb-item[aria-current="page"] {
  color: var(--color-text-dim);
  pointer-events: none;
}
.about-hero__title {
  font-family: var(--font-heading);
  font-size: clamp(2.2rem, 8vw, 4.2rem);
  font-weight: 900;
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: var(--color-text);
  margin: 0 0 0.5rem;
  text-shadow: 0 2px 16px rgba(0,0,0,0.4);
}
.about-hero__subtitle {
  font-size: clamp(1rem, 2.5vw, 1.3rem);
  color: var(--color-text-secondary);
  max-width: 580px;
  line-height: 1.6;
  margin: 0;
  font-weight: 400;
}

/* ===== 双栏杂志布局 ===== */
.about-layout {
  display: flex;
  flex-wrap: wrap;
  gap: 2rem;
  padding: 2.5rem 1.25rem 3.5rem;
  max-width: 1280px;
  margin: 0 auto;
}
.about-toc {
  flex: 0 0 var(--about-toc-width);
  max-width: var(--about-toc-width);
  position: relative;
}
.about-toc__inner {
  position: sticky;
  top: 5rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}
.about-toc__label {
  font-family: var(--font-heading);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-accent);
  opacity: 0.8;
}
.about-toc__list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.about-toc__link {
  display: block;
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--color-text-secondary);
  text-decoration: none;
  padding: 0.375rem 0.75rem;
  border-left: 2px solid var(--color-border);
  transition: all 0.25s ease;
  line-height: 1.4;
}
.about-toc__link:hover {
  color: var(--color-accent);
  border-left-color: var(--color-accent);
  padding-left: 1.25rem;
}
.about-toc__divider {
  width: 100%;
  height: 1px;
  background: var(--gradient-accent);
  opacity: 0.3;
  margin: 0.5rem 0;
}
.about-toc__stats {
  display: flex;
  gap: 1rem;
}
.about-toc__stat {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}
.about-toc__stat-num {
  font-family: var(--font-heading);
  font-size: 1.6rem;
  font-weight: 900;
  color: var(--color-accent);
  line-height: 1;
}
.about-toc__stat-label {
  font-size: 0.6875rem;
  color: var(--color-text-dim);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.about-content {
  flex: 1 1 0;
  min-width: 0;
  max-width: var(--about-content-max-width);
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
}

/* ===== 区块通用 ===== */
.about-section {
  border-top: 2px solid var(--color-border);
  padding-top: 1.75rem;
}
.about-section__title {
  font-family: var(--font-heading);
  font-size: clamp(1.5rem, 4vw, 2.2rem);
  font-weight: 900;
  color: var(--color-text);
  margin: 0 0 1rem;
  letter-spacing: -0.01em;
  position: relative;
  display: inline-block;
}
.about-section__title::after {
  content: '';
  display: block;
  width: 60%;
  height: 3px;
  background: var(--gradient-accent);
  margin-top: 0.375rem;
  clip-path: polygon(0 0, 100% 0, 95% 100%, 0 100%);
}
.about-section__text {
  font-size: 1rem;
  line-height: 1.8;
  color: var(--color-text-secondary);
  margin: 0 0 1rem;
  max-width: 720px;
}
.about-section__text strong {
  color: var(--color-accent);
  font-weight: 600;
}

/* ===== 数据服务区 ===== */
.about-data-card {
  background: var(--about-card-bg);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  padding: 1.25rem 1.5rem;
  margin: 1.25rem 0;
  transition: border-color 0.3s, box-shadow 0.3s;
  cursor: default;
}
.about-data-card[data-expanded="true"] {
  border-color: var(--color-accent-dim);
  box-shadow: var(--about-accent-glow);
}
.about-data-card__header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
}
.about-data-card__title {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-text);
}
.about-data-card__btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: transparent;
  border: 1px solid var(--color-border-light);
  color: var(--color-accent);
  font-family: var(--font-body);
  font-size: 0.8125rem;
  padding: 0.375rem 1rem;
  border-radius: 999px;
  cursor: pointer;
  transition: all 0.25s ease;
}
.about-data-card__btn:hover {
  background: var(--color-accent-dim);
  border-color: var(--color-accent);
}
.about-data-card__btn-icon {
  display: inline-block;
  font-size: 1.1rem;
  font-weight: 700;
  line-height: 1;
  transition: transform 0.3s ease;
}
.about-data-card[data-expanded="true"] .about-data-card__btn-icon {
  transform: rotate(45deg);
}
.about-data-card__btn-text {
  white-space: nowrap;
}
.about-data-card__body {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.45s ease, padding 0.3s ease;
  padding: 0 0.25rem;
}
.about-data-card[data-expanded="true"] .about-data-card__body {
  max-height: 320px;
  padding: 1.25rem 0.25rem 0.25rem;
}
.about-data-card__list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}
.about-data-card__list li {
  position: relative;
  padding-left: 1.25rem;
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  line-height: 1.5;
}
.about-data-card__list li::before {
  content: '▸';
  position: absolute;
  left: 0;
  color: var(--color-accent);
  font-weight: 700;
}

.about-data-visual {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.5rem;
  margin: 1rem 0;
}
.about-data-visual__img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border-light);
  object-fit: cover;
  aspect-ratio: 4 / 3;
}
.about-data-visual__caption {
  font-size: 0.8125rem;
  color: var(--color-text-dim);
  font-style: italic;
  letter-spacing: 0.02em;
}

/* ===== 移动端能力 ===== */
.about-mobile-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 2rem;
  align-items: flex-start;
}
.about-mobile-grid__text {
  flex: 1 1 55%;
  min-width: 260px;
}
.about-mobile-grid__device {
  flex: 0 0 160px;
  max-width: 160px;
  margin: 0 auto;
}
.about-mobile-device {
  width: 100%;
  height: auto;
  border-radius: 16px;
  border: 2px solid var(--color-border-light);
  object-fit: cover;
  aspect-ratio: 1 / 2;
  box-shadow: 0 8px 32px rgba(0,0,0,0.5);
}
.about-mobile-btn {
  margin-top: 0.5rem;
  display: inline-block;
}

/* ===== 联系方式 ===== */
.about-contact-group {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin: 1.25rem 0;
}
.about-contact-item {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.5rem 1rem;
  padding: 0.875rem 1.25rem;
  background: var(--about-card-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: all 0.3s ease;
}
.about-contact-item[data-hover="highlight"]:hover {
  border-color: var(--color-accent);
  box-shadow: var(--about-accent-glow);
  background: rgba(0, 255, 135, 0.05);
}
.about-contact-item__label {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  min-width: 80px;
}
.about-contact-item__value {
  font-size: 1rem;
  color: var(--color-text);
  font-weight: 500;
  word-break: break-all;
}
.about-contact-item__note {
  width: 100%;
  font-size: 0.8125rem;
  color: var(--color-text-dim);
  margin-top: 0.25rem;
  font-style: italic;
}
.about-contact-item--note {
  flex-direction: column;
  gap: 0.25rem;
}

.about-icp {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  margin: 1.25rem 0 1rem;
  padding: 0.5rem 1rem;
  border: 1px dashed var(--color-border-light);
  border-radius: var(--radius-sm);
}
.about-icp__badge {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-accent2);
  background: var(--color-accent2-dim);
  padding: 0.125rem 0.5rem;
  border-radius: var(--radius-sm);
}
.about-icp__code {
  font-family: var(--font-mono);
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
}

.about-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.25rem;
  margin: 1.5rem 0 0.5rem;
  padding-top: 1rem;
  border-top: 1px solid var(--color-border);
}
.about-links__item {
  font-size: 0.9375rem;
  color: var(--color-accent);
  text-decoration: none;
  transition: color 0.2s;
  position: relative;
}
.about-links__item::after {
  content: '→';
  margin-left: 0.375rem;
  transition: margin-left 0.2s;
}
.about-links__item:hover {
  color: var(--color-accent2);
}
.about-links__item:hover::after {
  margin-left: 0.625rem;
}

/* ===== 移动端适配 (窄屏优先) ===== */
@media (max-width: 767.98px) {
  .about-hero {
    min-height: 300px;
  }
  .about-hero__inner {
    padding: 1.5rem 1rem 1.5rem;
  }
  .about-layout {
    flex-direction: column;
    gap: 1.5rem;
    padding: 1.5rem 1rem 2.5rem;
  }
  .about-toc {
    flex: 0 0 auto;
    max-width: 100%;
    width: 100%;
  }
  .about-toc__inner {
    position: static;
    flex-direction: row;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.75rem;
  }
  .about-toc__label {
    display: none;
  }
  .about-toc__list {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 0.25rem 0.5rem;
  }
  .about-toc__link {
    font-size: 0.8125rem;
    padding: 0.25rem 0.5rem;
    border-left: none;
    border-bottom: 2px solid var(--color-border);
  }
  .about-toc__link:hover {
    padding-left: 0.5rem;
    border-left: none;
    border-bottom-color: var(--color-accent);
  }
  .about-toc__divider {
    display: none;
  }
  .about-toc__stats {
    gap: 0.75rem;
  }
  .about-toc__stat-num {
    font-size: 1.2rem;
  }
  .about-content {
    max-width: 100%;
    gap: 2rem;
  }
  .about-section__title {
    font-size: 1.4rem;
  }
  .about-mobile-grid {
    flex-direction: column;
    gap: 1.25rem;
  }
  .about-mobile-grid__text {
    flex: 1 1 auto;
    min-width: 0;
  }
  .about-mobile-grid__device {
    flex: 0 0 auto;
    max-width: 140px;
  }
  .about-contact-item {
    padding: 0.75rem 1rem;
  }
  .about-contact-item__label {
    min-width: 60px;
    font-size: 0.75rem;
  }
  .about-icp {
    flex-wrap: wrap;
  }
}

/* ===== 桌面端精细调整 ===== */
@media (min-width: 768px) {
  .about-hero__inner {
    padding: 3rem 2rem 2.5rem;
  }
  .about-layout {
    padding: 3rem 2rem 4rem;
    gap: 3rem;
  }
  .about-data-card__body {
    padding: 0 0.5rem;
  }
  .about-data-card[data-expanded="true"] .about-data-card__body {
    padding: 1.5rem 0.5rem 0.5rem;
  }
}

/* ===== 超大屏宽版 ===== */
@media (min-width: 1200px) {
  .about-hero {
    min-height: 480px;
  }
  .about-layout {
    gap: 4rem;
  }
}