/* ===== 品牌档案专属样式 ===== */
.page-about {
  --about-accent: linear-gradient(135deg, #E63946, #8B0000);
  --about-divider: linear-gradient(90deg, #00F5D4, #00B4D8);
  --about-card-hover: 0 8px 32px rgba(230, 57, 70, 0.25);
  --about-skew-angle: -3deg;
  display: block;
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 1.5rem 1rem 3rem;
  color: var(--text, #E0E0E0);
  font-family: var(--font-body, 'Inter', 'Roboto', sans-serif);
  background: var(--bg, #0D0D0D);
}

/* ---- 面包屑 ---- */
.page-about .breadcrumbs {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8rem;
  letter-spacing: 0.05em;
  color: var(--text, #E0E0E0);
  opacity: 0.7;
  margin-bottom: 2rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid rgba(230, 57, 70, 0.15);
}

.page-about .breadcrumbs a {
  color: var(--cyan, #00F5D4);
  text-decoration: none;
  transition: opacity 0.3s ease;
}

.page-about .breadcrumbs a:hover {
  opacity: 0.7;
}

.page-about .breadcrumbs span[aria-current="page"] {
  color: var(--text-high, #FFF5E1);
  font-weight: 600;
}

/* ---- 品牌英雄区 ---- */
.page-about .brand-hero {
  display: flex;
  flex-direction: column;
  gap: 2rem;
  margin-bottom: 4rem;
  position: relative;
  padding: 2rem 0;
}

.page-about .brand-hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: -1rem;
  right: -1rem;
  bottom: 0;
  background: linear-gradient(135deg, rgba(230,57,70,0.08) 0%, rgba(0,245,212,0.03) 100%);
  clip-path: polygon(0 0, 100% 2%, 98% 100%, 2% 98%);
  z-index: 0;
  pointer-events: none;
}

.page-about .brand-hero__text {
  position: relative;
  z-index: 1;
}

.page-about .brand-hero__tag {
  display: inline-block;
  font-family: var(--font-data, 'JetBrains Mono', monospace);
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--cyan, #00F5D4);
  border-left: 3px solid var(--red, #E63946);
  padding-left: 0.75rem;
  margin-bottom: 1.25rem;
  opacity: 0.8;
}

.page-about .brand-hero__title {
  font-family: var(--font-head, 'Impact', 'Oswald', sans-serif);
  font-size: clamp(3rem, 12vw, 6rem);
  font-style: italic;
  font-weight: 900;
  line-height: 0.9;
  letter-spacing: -0.03em;
  color: var(--red, #E63946);
  text-transform: uppercase;
  transform: skewX(var(--about-skew-angle, -3deg));
  margin: 0 0 0.5rem;
  text-shadow: 4px 4px 0 rgba(0,0,0,0.5), 0 0 40px rgba(230,57,70,0.2);
}

.page-about .brand-hero__sub {
  font-family: var(--font-head, 'Impact', 'Oswald', sans-serif);
  font-size: clamp(1rem, 4vw, 1.8rem);
  font-weight: 400;
  letter-spacing: 0.15em;
  color: var(--text-high, #FFF5E1);
  margin: 0 0 1.25rem;
  padding-left: 0.5rem;
  border-left: 2px solid var(--cyan, #00F5D4);
  transform: skewX(calc(var(--about-skew-angle, -3deg) * -0.5));
}

.page-about .brand-hero__desc {
  font-size: clamp(0.9rem, 2.5vw, 1.1rem);
  line-height: 1.7;
  color: var(--text, #E0E0E0);
  max-width: 36em;
  opacity: 0.85;
  margin: 0;
}

.page-about .brand-hero__visual {
  position: relative;
  z-index: 1;
  display: flex;
  justify-content: center;
  align-items: center;
}

.page-about .brand-hero__img {
  width: 100%;
  max-width: 400px;
  height: auto;
  aspect-ratio: 1/1;
  object-fit: cover;
  border-radius: 4px;
  box-shadow: 0 0 60px rgba(0,245,212,0.08);
  filter: saturate(1.1) contrast(1.05);
  clip-path: polygon(8% 0, 100% 0, 92% 100%, 0 100%);
  transition: clip-path 0.4s ease, box-shadow 0.4s ease;
}

.page-about .brand-hero__img:hover {
  clip-path: polygon(0 0, 100% 0, 100% 100%, 0 100%);
  box-shadow: 0 0 80px rgba(230,57,70,0.15);
}

/* ---- 区块标签（共用） ---- */
.page-about .section-label {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}

.page-about .section-label__num {
  font-family: var(--font-data, 'JetBrains Mono', monospace);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--red-dark, #8B0000);
  opacity: 0.6;
  line-height: 1;
}

.page-about .section-title {
  font-family: var(--font-head, 'Impact', 'Oswald', sans-serif);
  font-size: clamp(1.6rem, 5vw, 2.6rem);
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--text-high, #FFF5E1);
  margin: 0;
  text-transform: uppercase;
  position: relative;
  display: inline-block;
}

.page-about .section-title::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 60%;
  height: 3px;
  background: var(--about-divider, linear-gradient(90deg, #00F5D4, #00B4D8));
  border-radius: 2px;
}

/* ---- 核心功能 ---- */
.page-about .core-features {
  margin-bottom: 4rem;
  position: relative;
}

.page-about .features-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
  margin-bottom: 2rem;
}

.page-about .feature-card {
  background: var(--bg-light, #1A1A1A);
  border: 1px solid rgba(230,57,70,0.12);
  border-radius: 3px;
  cursor: pointer;
  perspective: 800px;
  transition: box-shadow 0.4s ease, transform 0.3s ease;
  transform-style: preserve-3d;
  position: relative;
}

.page-about .feature-card:hover {
  box-shadow: var(--about-card-hover, 0 8px 32px rgba(230,57,70,0.25));
  transform: translateY(-3px) scale(1.01);
  border-color: rgba(0,245,212,0.25);
}

.page-about .feature-card:focus-visible {
  outline: 2px solid var(--cyan, #00F5D4);
  outline-offset: 3px;
}

.page-about .feature-card__inner {
  padding: 1.5rem;
  position: relative;
  transition: transform 0.5s ease;
}

.page-about .feature-card__front {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.page-about .feature-card__ico {
  font-size: 1.6rem;
  line-height: 1;
  color: var(--cyan, #00F5D4);
  margin-bottom: 0.25rem;
  display: inline-block;
  transition: transform 0.3s ease;
}

.page-about .feature-card:hover .feature-card__ico {
  transform: scale(1.2) translateX(4px);
  color: var(--red, #E63946);
}

.page-about .feature-card__title {
  font-family: var(--font-head, 'Impact', 'Oswald', sans-serif);
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  color: var(--text-high, #FFF5E1);
  margin: 0;
  text-transform: uppercase;
}

.page-about .feature-card__preview {
  font-size: 0.85rem;
  color: var(--text, #E0E0E0);
  opacity: 0.65;
  margin: 0;
  line-height: 1.5;
}

.page-about .feature-card__back {
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid rgba(0,245,212,0.15);
  display: block;
}

.page-about .feature-card__back p {
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--text, #E0E0E0);
  margin: 0 0 0.75rem;
  opacity: 0.9;
}

.page-about .feature-card__link {
  display: inline-block;
  font-family: var(--font-data, 'JetBrains Mono', monospace);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--cyan, #00F5D4);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s ease;
}

.page-about .feature-card__link:hover {
  border-bottom-color: var(--cyan, #00F5D4);
}

.page-about .features-visual {
  margin-top: 1.5rem;
  position: relative;
  overflow: hidden;
  border-radius: 3px;
}

.page-about .features-visual img {
  width: 100%;
  height: auto;
  max-height: 400px;
  object-fit: cover;
  display: block;
  clip-path: polygon(2% 0, 100% 0, 98% 100%, 0 100%);
  filter: grayscale(0.3) contrast(1.1);
  transition: clip-path 0.4s ease, filter 0.4s ease;
}

.page-about .features-visual img:hover {
  clip-path: polygon(0 0, 100% 0, 100% 100%, 0 100%);
  filter: grayscale(0) contrast(1.15);
}

/* ---- 数据覆盖范围 ---- */
.page-about .data-coverage {
  margin-bottom: 4rem;
}

.page-about .coverage-content {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  background: var(--bg-light, #1A1A1A);
  padding: 1.5rem;
  border-radius: 3px;
  border-left: 4px solid var(--red, #E63946);
  position: relative;
}

.page-about .coverage-content::before {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 120px;
  height: 120px;
  background: radial-gradient(circle at top right, rgba(0,245,212,0.06), transparent 70%);
  pointer-events: none;
}

.page-about .coverage-text {
  flex: 1;
}

.page-about .coverage-text p {
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--text, #E0E0E0);
  margin: 0 0 1.25rem;
  opacity: 0.9;
}

.page-about .coverage-list {
  list-style: none;
  padding: 0;
  margin: 0 0 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.page-about .coverage-list li {
  font-size: 0.9rem;
  padding-left: 1.5rem;
  position: relative;
  color: var(--text, #E0E0E0);
  line-height: 1.5;
}

.page-about .coverage-list li::before {
  content: '▶';
  position: absolute;
  left: 0;
  top: 0;
  color: var(--red, #E63946);
  font-size: 0.65rem;
  opacity: 0.7;
}

.page-about .coverage-visual {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

.page-about .coverage-visual img {
  width: 100%;
  max-width: 300px;
  height: auto;
  aspect-ratio: 3/2;
  object-fit: cover;
  border-radius: 2px;
  box-shadow: 0 4px 20px rgba(0,0,0,0.4);
  filter: hue-rotate(-5deg) saturate(0.9);
  transition: transform 0.4s ease, box-shadow 0.4s ease;
}

.page-about .coverage-visual img:hover {
  transform: scale(1.03);
  box-shadow: 0 8px 40px rgba(0,245,212,0.12);
}

/* ---- 联系我们 ---- */
.page-about .contact-section {
  margin-bottom: 2rem;
}

.page-about .contact-body {
  background: var(--bg-light, #1A1A1A);
  padding: 1.5rem;
  border-radius: 3px;
  border: 1px solid rgba(230,57,70,0.1);
  position: relative;
  overflow: hidden;
}

.page-about .contact-body::after {
  content: '';
  position: absolute;
  bottom: 0;
  right: 0;
  width: 180px;
  height: 180px;
  background: radial-gradient(circle at bottom right, rgba(230,57,70,0.06), transparent 70%);
  pointer-events: none;
}

.page-about .contact-desc {
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--text, #E0E0E0);
  margin: 0 0 1.5rem;
  opacity: 0.85;
  max-width: 34em;
}

.page-about .contact-channels {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-bottom: 1.25rem;
}

.page-about .contact-channel {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  padding: 0.5rem 0;
  border-bottom: 1px solid rgba(255,255,255,0.04);
}

.page-about .contact-channel__label {
  font-family: var(--font-data, 'JetBrains Mono', monospace);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--cyan, #00F5D4);
  min-width: 3rem;
  opacity: 0.7;
}

.page-about .contact-channel__value {
  font-size: 0.95rem;
  color: var(--text-high, #FFF5E1);
  word-break: break-all;
}

.page-about .contact-channel a.contact-channel__value {
  color: var(--cyan, #00F5D4);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s ease;
}

.page-about .contact-channel a.contact-channel__value:hover {
  border-bottom-color: var(--cyan, #00F5D4);
}

.page-about .contact-note {
  font-size: 0.75rem;
  line-height: 1.6;
  color: var(--text, #E0E0E0);
  opacity: 0.5;
  margin: 1rem 0 1.5rem;
  padding: 0.75rem 0 0;
  border-top: 1px solid rgba(255,255,255,0.04);
}

.page-about .contact-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

/* ---- 按钮（页面专属微调） ---- */
.page-about .btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-data, 'JetBrains Mono', monospace);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 0.65rem 1.5rem;
  border: none;
  border-radius: 2px;
  cursor: pointer;
  text-decoration: none;
  transition: all 0.3s ease;
  background: var(--red, #E63946);
  color: #FFFFFF;
  box-shadow: 0 2px 12px rgba(230,57,70,0.2);
}

.page-about .btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(230,57,70,0.35);
}

.page-about .btn--primary {
  background: var(--red, #E63946);
  color: #FFFFFF;
}

.page-about .btn--ghost {
  background: transparent;
  color: var(--cyan, #00F5D4);
  border: 1px solid rgba(0,245,212,0.25);
  box-shadow: none;
}

.page-about .btn--ghost:hover {
  background: rgba(0,245,212,0.06);
  border-color: var(--cyan, #00F5D4);
  box-shadow: 0 4px 16px rgba(0,245,212,0.1);
}

/* ---- 桌面端布局（≥768px） ---- */
@media (min-width: 768px) {
  .page-about {
    padding: 2.5rem 2rem 4rem;
  }

  .page-about .brand-hero {
    flex-direction: row;
    align-items: center;
    gap: 3rem;
    padding: 3rem 0;
  }

  .page-about .brand-hero__text {
    flex: 1 1 55%;
  }

  .page-about .brand-hero__visual {
    flex: 0 1 40%;
    justify-content: flex-end;
  }

  .page-about .brand-hero__title {
    font-size: clamp(4rem, 8vw, 7rem);
  }

  .page-about .features-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
  }

  .page-about .feature-card__inner {
    padding: 1.75rem;
  }

  .page-about .coverage-content {
    flex-direction: row;
    align-items: center;
    padding: 2rem 2.5rem;
    gap: 2.5rem;
  }

  .page-about .coverage-text {
    flex: 1 1 60%;
  }

  .page-about .coverage-visual {
    flex: 0 1 35%;
  }

  .page-about .contact-body {
    padding: 2rem 2.5rem;
  }

  .page-about .contact-channels {
    flex-direction: row;
    gap: 2rem;
  }

  .page-about .contact-channel {
    border-bottom: none;
    padding: 0.75rem 0;
  }

  .page-about .contact-desc {
    font-size: 1rem;
  }
}

/* ---- 桌面端宽屏（≥1024px） ---- */
@media (min-width: 1024px) {
  .page-about {
    padding: 3rem 2.5rem 5rem;
  }

  .page-about .brand-hero {
    gap: 4rem;
    padding: 4rem 0;
  }

  .page-about .brand-hero__title {
    font-size: clamp(5rem, 7vw, 8rem);
  }

  .page-about .features-grid {
    gap: 2rem;
  }

  .page-about .feature-card__inner {
    padding: 2rem;
  }

  .page-about .coverage-content {
    padding: 2.5rem 3rem;
  }

  .page-about .contact-body {
    padding: 2.5rem 3rem;
  }
}

/* ---- 数据可见性交互（渐进增强） ---- */
.page-about .feature-card[data-visible="false"] .feature-card__back {
  display: none;
}

.page-about .feature-card[data-visible="true"] .feature-card__back {
  display: block;
}

/* ---- 小屏安全边距 ---- */
@media (max-width: 420px) {
  .page-about .brand-hero__title {
    font-size: 2.6rem;
    transform: skewX(-2deg);
  }
  .page-about .coverage-content {
    padding: 1rem;
  }
  .page-about .contact-body {
    padding: 1rem;
  }
  .page-about .contact-actions {
    flex-direction: column;
  }
  .page-about .btn {
    justify-content: center;
  }
}
<<</PAGE_CSS>>>