/* ===== 页面专属：page-about ===== */
.page-about {
  --about-hero-glow: 0 0 40px rgba(0, 229, 255, 0.12);
  --about-quote-bg: rgba(255, 215, 0, 0.05);
  --about-clip-deg: 10deg;
  display: block;
  width: 100%;
  max-width: 100%;
  background-color: var(--color-base-dark, #0A1F3F);
  color: var(--color-text-primary, #E0E6ED);
  font-family: var(--font-body, 'Inter', 'Noto Sans SC', sans-serif);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ---- 面包屑 ---- */
.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem 0.6rem;
  padding: 0 0 1.25rem;
  font-size: var(--text-sm, 0.875rem);
  font-family: var(--font-mono, 'JetBrains Mono', monospace);
  color: var(--color-text-secondary, #8A9BAE);
  letter-spacing: 0.02em;
}

.page-about .breadcrumb__link {
  color: var(--color-accent-cyan, #00E5FF);
  text-decoration: none;
  transition: color 0.25s ease, box-shadow 0.25s ease;
  box-shadow: 0 1px 0 transparent;
}

.page-about .breadcrumb__link:hover,
.page-about .breadcrumb__link:focus-visible {
  color: var(--color-accent-gold, #FFD700);
  box-shadow: 0 1px 0 var(--color-accent-gold, #FFD700);
  outline: none;
}

.page-about .breadcrumb__sep {
  color: var(--color-text-secondary, #8A9BAE);
  opacity: 0.5;
  font-size: 0.75rem;
}

.page-about .breadcrumb__current {
  color: var(--color-text-primary, #E0E6ED);
  font-weight: 600;
  letter-spacing: 0.03em;
}

/* ---- Hero 区块 ---- */
.page-about__hero {
  padding: 4rem 1.25rem 2.5rem;
  max-width: var(--max-width, 1200px);
  margin: 0 auto;
  position: relative;
}

.page-about__hero-inner {
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
  align-items: flex-start;
}

.page-about__hero-text {
  flex: 1 1 100%;
  max-width: 100%;
}

.page-about .section-label {
  display: inline-block;
  font-family: var(--font-mono, 'JetBrains Mono', monospace);
  font-size: var(--text-sm, 0.875rem);
  color: var(--color-accent-cyan, #00E5FF);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  margin-bottom: 1rem;
  padding: 0.2rem 0.6rem;
  border-left: 2px solid var(--color-accent-gold, #FFD700);
  opacity: 0.85;
}

.page-about__hero-title {
  font-family: var(--font-heading, 'Inter', 'Noto Sans SC', sans-serif);
  font-weight: 800;
  font-size: clamp(2rem, 6vw, var(--text-3xl, 3.052rem));
  line-height: 1.15;
  color: var(--color-accent-gold, #FFD700);
  margin: 0 0 1.25rem;
  letter-spacing: -0.02em;
  max-width: 12ch;
}

.page-about__hero-desc {
  font-size: var(--text-md, 1.25rem);
  color: var(--color-text-secondary, #8A9BAE);
  line-height: 1.65;
  max-width: 52ch;
  margin: 0;
}

.page-about__hero-visual {
  flex: 0 0 auto;
  width: 100%;
  max-width: 600px;
  margin: 0 auto;
  box-shadow: var(--about-hero-glow);
  border-radius: 4px;
  overflow: hidden;
  transform: perspective(800px) rotateY(-1deg);
  transition: transform 0.6s var(--ease-elastic, cubic-bezier(0.34, 1.56, 0.64, 1));
}

.page-about__hero-visual:hover {
  transform: perspective(800px) rotateY(0deg);
}

.page-about__hero-img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 3 / 2;
}

.page-about .glow-line {
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--color-accent-cyan, #00E5FF), transparent);
  opacity: 0.4;
  margin-top: 2.5rem;
  width: 100%;
}

/* ---- 通用区块结构 ---- */
.page-about__section {
  padding: 3.5rem 1.25rem;
  max-width: var(--max-width, 1200px);
  margin: 0 auto;
}

.page-about__section-inner {
  width: 100%;
}

.page-about__section-heading {
  font-family: var(--font-heading, 'Inter', 'Noto Sans SC', sans-serif);
  font-weight: 800;
  font-size: var(--text-xl, 1.953rem);
  line-height: 1.2;
  color: var(--color-accent-gold, #FFD700);
  margin: 0.75rem 0 0.5rem;
  letter-spacing: -0.01em;
}

.page-about__section-note {
  font-size: var(--text-sm, 0.875rem);
  color: var(--color-text-secondary, #8A9BAE);
  line-height: 1.6;
  margin: 0.5rem 0 0;
  max-width: 28ch;
}

.page-about__body-text {
  font-size: var(--text-base, 1rem);
  color: var(--color-text-primary, #E0E6ED);
  line-height: 1.75;
  margin: 0 0 1.25rem;
  max-width: 68ch;
}

.page-about__body-text:last-child {
  margin-bottom: 0;
}

.page-about__highlight {
  color: var(--color-accent-cyan, #00E5FF);
  font-weight: 600;
  letter-spacing: 0.02em;
}

/* ---- 区块：品牌理念 ---- */
.page-about__philosophy-content {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.page-about__philosophy-quote {
  position: relative;
  background: var(--about-quote-bg);
  padding: 2rem 1.75rem;
  margin-top: 0.75rem;
  border-left: 3px solid var(--color-accent-gold, #FFD700);
  clip-path: polygon(0 0, calc(100% - 24px) 0, 100% 24px, 100% calc(100% - 8px), calc(100% - 16px) 100%, 0 100%);
}

.page-about__quote-mark {
  position: absolute;
  top: 0.75rem;
  right: 1.25rem;
  width: 40px;
  height: 32px;
  opacity: 0.25;
}

.page-about__quote-text {
  font-size: var(--text-md, 1.25rem);
  font-style: italic;
  color: var(--color-accent-gold, #FFD700);
  line-height: 1.6;
  margin: 0;
  max-width: 48ch;
  position: relative;
  z-index: 1;
}

/* ---- 装饰分割 ---- */
.page-about__divider {
  max-width: var(--max-width, 1200px);
  margin: 0 auto;
  padding: 0 1.25rem;
  opacity: 0.5;
}

.page-about__divider-img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 8 / 1;
  object-fit: cover;
  border-radius: 2px;
}

/* ---- 区块：服务承诺 ---- */
.page-about__commitment-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  width: 100%;
}

.page-about__commitment-item {
  background: var(--color-surface-dark, #0D2B4E);
  border-radius: 4px;
  overflow: hidden;
  transition: box-shadow 0.3s ease;
}

.page-about__commitment-item:hover {
  box-shadow: 0 0 0 1px rgba(0, 229, 255, 0.15), 0 4px 20px rgba(0, 0, 0, 0.3);
}

.page-about__commitment-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1.25rem 1.5rem;
  cursor: pointer;
  user-select: none;
  transition: background 0.25s ease;
  position: relative;
}

.page-about__commitment-header:hover {
  background: rgba(0, 229, 255, 0.04);
}

.page-about__commitment-header:focus-visible {
  outline: 2px solid var(--color-accent-cyan, #00E5FF);
  outline-offset: -2px;
}

.page-about__commitment-num {
  font-family: var(--font-mono, 'JetBrains Mono', monospace);
  font-size: var(--text-sm, 0.875rem);
  color: var(--color-accent-cyan, #00E5FF);
  opacity: 0.6;
  flex-shrink: 0;
  width: 2.5rem;
  text-align: right;
}

.page-about__commitment-title {
  font-family: var(--font-heading, 'Inter', 'Noto Sans SC', sans-serif);
  font-weight: 700;
  font-size: var(--text-md, 1.25rem);
  color: var(--color-text-primary, #E0E6ED);
  margin: 0;
  flex: 1 1 auto;
  letter-spacing: 0.01em;
}

.page-about__commitment-icon {
  font-size: 1.5rem;
  font-weight: 300;
  color: var(--color-accent-gold, #FFD700);
  transition: transform 0.4s var(--ease-elastic, cubic-bezier(0.34, 1.56, 0.64, 1));
  flex-shrink: 0;
  width: 1.5rem;
  text-align: center;
}

.page-about__commitment-item[data-expanded] .page-about__commitment-icon {
  transform: rotate(45deg);
}

.page-about__commitment-body {
  padding: 0 1.5rem 0 4rem;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.5s ease, padding 0.4s ease, opacity 0.3s ease;
  opacity: 0;
}

.page-about__commitment-item[data-expanded] .page-about__commitment-body {
  max-height: 300px;
  padding: 0 1.5rem 1.5rem 4rem;
  opacity: 1;
}

.page-about__commitment-body .page-about__body-text {
  font-size: var(--text-sm, 0.875rem);
  color: var(--color-text-secondary, #8A9BAE);
  margin-bottom: 0.75rem;
}

.page-about__inline-link {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: var(--text-sm, 0.875rem);
  color: var(--color-accent-cyan, #00E5FF);
  text-decoration: none;
  padding: 0.35rem 0.75rem;
  border: 1px solid var(--color-accent-cyan, #00E5FF);
  border-radius: 2px;
  transition: all 0.3s ease;
  margin-top: 0.25rem;
}

.page-about__inline-link:hover,
.page-about__inline-link:focus-visible {
  background: rgba(0, 229, 255, 0.1);
  box-shadow: var(--shadow-glow-cyan, 0 0 12px rgba(0, 229, 255, 0.3));
  color: var(--color-accent-gold, #FFD700);
  border-color: var(--color-accent-gold, #FFD700);
  outline: none;
}

.btn__arrow {
  display: inline-block;
  transition: transform 0.3s ease;
}

.page-about__inline-link:hover .btn__arrow,
.page-about__inline-link:focus-visible .btn__arrow {
  transform: translateX(4px);
}

/* ---- 区块：用户体验方法 ---- */
.page-about__approach-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

.page-about__approach-item {
  background: var(--color-surface-medium, #152C4A);
  padding: 2rem 1.75rem;
  clip-path: polygon(0 0, calc(100% - 20px) 0, 100% 20px, 100% calc(100% - 8px), calc(100% - 12px) 100%, 0 100%);
  transition: transform 0.4s var(--ease-elastic, cubic-bezier(0.34, 1.56, 0.64, 1)), box-shadow 0.3s ease;
  position: relative;
  border-left: 2px solid transparent;
}

.page-about__approach-item:hover {
  transform: translateY(-4px) scale(1.01);
  box-shadow: 0 8px 30px rgba(0, 229, 255, 0.08);
  border-left-color: var(--color-accent-cyan, #00E5FF);
}

.page-about__approach-num {
  font-family: var(--font-mono, 'JetBrains Mono', monospace);
  font-size: var(--text-lg, 1.563rem);
  font-weight: 700;
  color: var(--color-accent-gold, #FFD700);
  opacity: 0.25;
  position: absolute;
  top: 1rem;
  right: 1.25rem;
  line-height: 1;
}

.page-about__approach-title {
  font-family: var(--font-heading, 'Inter', 'Noto Sans SC', sans-serif);
  font-weight: 700;
  font-size: var(--text-md, 1.25rem);
  color: var(--color-accent-gold, #FFD700);
  margin: 0 0 0.6rem;
  letter-spacing: 0.01em;
}

.page-about__approach-text {
  font-size: var(--text-sm, 0.875rem);
  color: var(--color-text-secondary, #8A9BAE);
  line-height: 1.65;
  margin: 0;
  max-width: 44ch;
}

/* ---- 信任声明 ---- */
.page-about__cta-line {
  max-width: var(--max-width, 1200px);
  margin: 0 auto;
  padding: 0 1.25rem;
}

.page-about__section--trust {
  padding-top: 2rem;
  padding-bottom: 4rem;
}

.page-about__trust-inner {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  align-items: flex-start;
}

.page-about__trust-text {
  font-size: var(--text-sm, 0.875rem);
  color: var(--color-text-secondary, #8A9BAE);
  margin: 0;
  max-width: 52ch;
  line-height: 1.6;
}

.page-about__trust-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.page-about__trust-link {
  font-size: var(--text-sm, 0.875rem);
  color: var(--color-accent-cyan, #00E5FF);
  text-decoration: none;
  padding: 0.4rem 1rem;
  border: 1px solid rgba(0, 229, 255, 0.25);
  border-radius: 2px;
  transition: all 0.3s ease;
  font-family: var(--font-mono, 'JetBrains Mono', monospace);
  letter-spacing: 0.02em;
}

.page-about__trust-link:hover,
.page-about__trust-link:focus-visible {
  border-color: var(--color-accent-gold, #FFD700);
  color: var(--color-accent-gold, #FFD700);
  background: rgba(255, 215, 0, 0.06);
  box-shadow: var(--shadow-glow-gold, 0 0 12px rgba(255, 215, 0, 0.25));
  outline: none;
}

/* ===== 内容网格 (content-grid 共享类适配) ===== */
.page-about .content-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem 2.5rem;
  align-items: start;
}

.page-about .content-grid__aside {
  order: -1;
}

.page-about .content-grid__main {
  min-width: 0;
}

/* ===== 桌面端 ===== */
@media (min-width: 768px) {
  .page-about__hero {
    padding: 5rem 2rem 3rem;
  }

  .page-about__hero-inner {
    flex-direction: row;
    align-items: center;
    gap: 3rem;
  }

  .page-about__hero-text {
    flex: 1 1 55%;
    max-width: 55%;
  }

  .page-about__hero-visual {
    flex: 0 0 40%;
    max-width: 40%;
    margin: 0;
    transform: perspective(800px) rotateY(-2deg);
  }

  .page-about__hero-title {
    font-size: var(--text-3xl, 3.052rem);
  }

  .page-about__hero-desc {
    font-size: var(--text-md, 1.25rem);
  }

  .page-about__section {
    padding: 5rem 2rem;
  }

  .page-about .content-grid {
    grid-template-columns: 1fr 2fr;
  }

  .page-about .content-grid__aside {
    order: 0;
    position: sticky;
    top: calc(var(--header-height, 56px) + 1.5rem);
  }

  .page-about__section-heading {
    font-size: var(--text-2xl, 2.441rem);
  }

  .page-about__philosophy-quote {
    padding: 2.5rem 2.5rem 2.5rem 3rem;
    margin-top: 0.5rem;
  }

  .page-about__approach-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .page-about__commitment-header {
    padding: 1.5rem 2rem;
  }

  .page-about__commitment-body {
    padding: 0 2rem 0 5.5rem;
  }

  .page-about__commitment-item[data-expanded] .page-about__commitment-body {
    padding: 0 2rem 1.75rem 5.5rem;
  }

  .page-about__section--trust {
    padding-top: 3rem;
    padding-bottom: 5rem;
  }

  .page-about__trust-inner {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }
}

@media (min-width: 1024px) {
  .page-about__hero {
    padding: 6rem 2rem 3.5rem;
  }

  .page-about .content-grid {
    grid-template-columns: 1fr 2.5fr;
    gap: 2.5rem 3.5rem;
  }

  .page-about__approach-grid {
    gap: 2rem;
  }

  .page-about__approach-item {
    padding: 2.5rem 2rem;
  }
}

/* ===== 确保可折叠内容在无 JS 时完全可见（渐进增强） ===== */
@media (prefers-reduced-motion: reduce) {
  .page-about__commitment-body {
    transition: none !important;
  }

  .page-about__commitment-item .page-about__commitment-body {
    max-height: none !important;
    opacity: 1 !important;
    padding: 0 1.5rem 1.5rem 4rem;
  }

  .page-about__commitment-icon {
    display: none;
  }

  .page-about__hero-visual {
    transform: none !important;
  }
}

/* ===== 打印优化 ===== */
@media print {
  .page-about {
    background: #fff;
    color: #111;
  }

  .page-about__hero,
  .page-about__section {
    padding: 1.5rem 0;
    page-break-inside: avoid;
  }

  .page-about .glow-line,
  .page-about__divider,
  .page-about__commitment-icon {
    display: none;
  }

  .page-about__commitment-body {
    max-height: none !important;
    opacity: 1 !important;
    padding: 0.5rem 0 0.5rem 2rem;
  }

  .page-about__hero-title,
  .page-about__section-heading {
    color: #0A1F3F;
  }

  .page-about__body-text {
    color: #222;
  }
}