/* ===== 页面专属 CSS — .page-about ===== */
.page-about {
  --about-accent-line: var(--color-accent, #D32F2F);
  --about-accent-glow: rgba(211, 47, 47, 0.15);
  --about-number-opacity: 0.12;
  --about-number-size: clamp(4rem, 10vw, 7rem);
  --about-section-gap: clamp(3rem, 6vw, 5.5rem);
  --about-card-radius: 4px;
  --about-transition: var(--transition-default, 0.3s cubic-bezier(0.4, 0, 0.2, 1));

  display: flex;
  flex-direction: column;
  gap: 0;
  padding: 0;
  background-color: var(--color-bg, #FDF5E6);
  color: var(--color-text, #3E2723);
  font-family: var(--font-body, 'Inter', 'Noto Sans SC', system-ui, sans-serif);
  line-height: 1.6;
  overflow-x: hidden;
}

/* --- 面包屑 --- */
.page-about .breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 1rem var(--content-padding, 1rem);
  max-width: var(--content-max, 1200px);
  margin: 0 auto;
  width: 100%;
  box-sizing: border-box;
  font-size: 0.875rem;
  color: var(--color-text, #3E2723);
  opacity: 0.7;
}

.page-about .breadcrumb-link {
  color: var(--about-accent-line);
  text-decoration: none;
  transition: opacity var(--about-transition);
}

.page-about .breadcrumb-link:hover {
  opacity: 0.75;
  text-decoration: underline;
}

.page-about .breadcrumb-sep {
  font-size: 0.75rem;
  user-select: none;
}

.page-about .breadcrumb-current {
  font-weight: 600;
  color: var(--color-text, #3E2723);
}

/* --- 首屏 Hero --- */
.page-about .about-hero {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 45vh;
  padding: clamp(2.5rem, 5vw, 4.5rem) var(--content-padding, 1rem);
  background: linear-gradient(160deg, var(--color-bg, #FDF5E6) 0%, rgba(25, 118, 210, 0.05) 60%, var(--color-bg, #FDF5E6) 100%);
  text-align: center;
  overflow: hidden;
}

.page-about .hero-inner {
  position: relative;
  z-index: 2;
  max-width: 720px;
  margin: 0 auto;
}

.page-about .hero-heading {
  font-family: var(--font-heading, 'Montserrat', 'Exo 2', system-ui, sans-serif);
  font-size: clamp(2.2rem, 5.5vw, 3.8rem);
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--color-text, #3E2723);
  margin: 0 0 0.5rem;
  text-shadow: 0 2px 12px var(--about-accent-glow);
  line-height: 1.15;
}

.page-about .hero-tagline {
  font-family: var(--font-heading, 'Montserrat', 'Exo 2', system-ui, sans-serif);
  font-size: clamp(1.1rem, 2.2vw, 1.5rem);
  font-weight: 500;
  color: var(--about-accent-line);
  margin: 0 0 1rem;
  letter-spacing: 0.02em;
}

.page-about .hero-desc {
  font-size: clamp(0.95rem, 1.4vw, 1.1rem);
  color: var(--color-text, #3E2723);
  opacity: 0.82;
  max-width: 580px;
  margin: 0 auto;
  line-height: 1.7;
}

/* --- 星光粒子 --- */
.page-about .stardust {
  position: absolute;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
  z-index: 1;
}

.page-about .stardust-particle {
  position: absolute;
  display: block;
  width: 4px;
  height: 4px;
  background: var(--color-blue, #1976D2);
  border-radius: 50%;
  opacity: 0.3;
  animation: about-drift 18s infinite alternate ease-in-out;
}

.page-about .stardust-particle:nth-child(1) { left: 8%; top: 20%; animation-delay: 0s; animation-duration: 20s; width: 3px; height: 3px; background: var(--color-gold, #FFD54F); }
.page-about .stardust-particle:nth-child(2) { left: 22%; top: 60%; animation-delay: -3s; animation-duration: 22s; width: 5px; height: 5px; background: var(--color-purple, #9C27B0); }
.page-about .stardust-particle:nth-child(3) { left: 55%; top: 15%; animation-delay: -6s; animation-duration: 17s; width: 3px; height: 3px; background: var(--color-green, #00E676); }
.page-about .stardust-particle:nth-child(4) { left: 78%; top: 45%; animation-delay: -9s; animation-duration: 24s; width: 6px; height: 6px; background: var(--color-blue, #1976D2); opacity: 0.2; }
.page-about .stardust-particle:nth-child(5) { left: 45%; top: 75%; animation-delay: -12s; animation-duration: 19s; width: 4px; height: 4px; background: var(--color-gold, #FFD54F); }
.page-about .stardust-particle:nth-child(6) { left: 90%; top: 80%; animation-delay: -15s; animation-duration: 21s; width: 3px; height: 3px; background: var(--color-purple, #9C27B0); }

@keyframes about-drift {
  0% { transform: translate(0, 0) scale(1); opacity: 0.25; }
  25% { transform: translate(12px, -18px) scale(1.15); opacity: 0.45; }
  50% { transform: translate(-8px, 10px) scale(0.9); opacity: 0.3; }
  75% { transform: translate(16px, -8px) scale(1.05); opacity: 0.5; }
  100% { transform: translate(-10px, 20px) scale(0.95); opacity: 0.2; }
}

/* --- 通用章节装饰 --- */
.page-about .section-number {
  display: block;
  font-family: var(--font-heading, 'Montserrat', 'Exo 2', system-ui, sans-serif);
  font-size: var(--about-number-size);
  font-weight: 900;
  line-height: 1;
  color: var(--about-accent-line);
  opacity: var(--about-number-opacity);
  user-select: none;
  pointer-events: none;
}

.page-about .section-heading {
  font-family: var(--font-heading, 'Montserrat', 'Exo 2', system-ui, sans-serif);
  font-size: clamp(1.8rem, 3.5vw, 2.8rem);
  font-weight: 700;
  color: var(--color-text, #3E2723);
  margin: 0 0 1.25rem;
  line-height: 1.2;
  position: relative;
}

.page-about .section-heading::after {
  content: '';
  display: block;
  width: 3rem;
  height: 3px;
  background: var(--about-accent-line);
  margin-top: 0.6rem;
  border-radius: 2px;
}

/* --- 01 我们的故事 --- */
.page-about .about-story {
  position: relative;
  padding: var(--about-section-gap) var(--content-padding, 1rem);
  max-width: var(--content-max, 1200px);
  margin: 0 auto;
  width: 100%;
  box-sizing: border-box;
}

.page-about .story-container {
  display: flex;
  flex-direction: column;
  gap: 2rem;
  margin-top: -1.5rem;
}

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

.page-about .story-paragraph {
  font-size: clamp(1rem, 1.3vw, 1.1rem);
  color: var(--color-text, #3E2723);
  opacity: 0.88;
  margin: 0 0 1.2rem;
  line-height: 1.75;
  max-width: 640px;
}

.page-about .story-image-wrap {
  flex-shrink: 0;
  width: 100%;
  max-width: 500px;
  margin: 0 auto;
}

.page-about .story-image {
  display: block;
  width: 100%;
  height: auto;
  max-width: 500px;
  border-radius: var(--about-card-radius);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.06);
  object-fit: cover;
  aspect-ratio: 1 / 1;
}

/* --- 02 核心功能 --- */
.page-about .about-features {
  position: relative;
  padding: var(--about-section-gap) var(--content-padding, 1rem);
  background: linear-gradient(180deg, rgba(25, 118, 210, 0.03) 0%, var(--color-bg, #FDF5E6) 100%);
}

.page-about .features-inner {
  max-width: var(--content-max, 1200px);
  margin: 0 auto;
  width: 100%;
  box-sizing: border-box;
}

.page-about .features-intro {
  font-size: 1.05rem;
  color: var(--color-text, #3E2723);
  opacity: 0.75;
  margin: -1rem 0 2rem;
  font-style: italic;
}

.page-about .feature-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
  margin-bottom: 2.5rem;
}

.page-about .feature-card {
  position: relative;
  background: var(--color-bg, #FDF5E6);
  border: 1px solid rgba(62, 39, 35, 0.08);
  border-radius: var(--about-card-radius);
  padding: 1.75rem 1.5rem;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 14px), calc(100% - 14px) 100%, 0 100%);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.04);
  transition: transform var(--about-transition), box-shadow var(--about-transition);
  cursor: default;
}

.page-about .feature-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
}

.page-about .feature-icon {
  font-size: 1.8rem;
  margin-bottom: 0.5rem;
  line-height: 1;
}

.page-about .feature-title {
  font-family: var(--font-heading, 'Montserrat', 'Exo 2', system-ui, sans-serif);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--color-text, #3E2723);
  margin: 0 0 0.5rem;
}

.page-about .feature-desc {
  font-size: 0.95rem;
  color: var(--color-text, #3E2723);
  opacity: 0.82;
  margin: 0 0 0.75rem;
  line-height: 1.6;
}

.page-about .feature-detail {
  font-size: 0.9rem;
  color: var(--color-text, #3E2723);
  opacity: 0;
  max-height: 0;
  overflow: hidden;
  transition: opacity var(--about-transition), max-height var(--about-transition);
  line-height: 1.65;
  border-top: 1px solid transparent;
  padding-top: 0;
}

.page-about .feature-card:hover .feature-detail {
  opacity: 0.85;
  max-height: 180px;
  border-top-color: rgba(211, 47, 47, 0.15);
  padding-top: 0.75rem;
}

.page-about .features-visual {
  margin-top: 0.5rem;
}

.page-about .features-image {
  display: block;
  width: 100%;
  height: auto;
  max-width: 800px;
  border-radius: var(--about-card-radius);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 16px), calc(100% - 16px) 100%, 0 100%);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.05);
  object-fit: cover;
  aspect-ratio: 800 / 400;
  margin: 0 auto;
}

/* --- 03 覆盖范围 --- */
.page-about .about-coverage {
  position: relative;
  padding: var(--about-section-gap) var(--content-padding, 1rem);
  max-width: var(--content-max, 1200px);
  margin: 0 auto;
  width: 100%;
  box-sizing: border-box;
}

.page-about .coverage-container {
  display: flex;
  flex-direction: column;
  gap: 2rem;
  margin-top: -1.5rem;
}

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

.page-about .coverage-paragraph {
  font-size: clamp(1rem, 1.3vw, 1.1rem);
  color: var(--color-text, #3E2723);
  opacity: 0.88;
  margin: 0 0 1.2rem;
  line-height: 1.75;
  max-width: 640px;
}

.page-about .coverage-trust {
  font-size: 0.95rem;
  color: var(--color-blue, #1976D2);
  background: rgba(25, 118, 210, 0.06);
  padding: 1rem 1.4rem;
  border-left: 3px solid var(--color-blue, #1976D2);
  border-radius: 0 var(--about-card-radius) var(--about-card-radius) 0;
  margin-top: 1.5rem;
  line-height: 1.6;
  max-width: 600px;
}

.page-about .coverage-image-wrap {
  flex-shrink: 0;
  width: 100%;
  max-width: 700px;
  margin: 0 auto;
}

.page-about .coverage-image {
  display: block;
  width: 100%;
  height: auto;
  max-width: 700px;
  border-radius: var(--about-card-radius);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 16px), calc(100% - 16px) 100%, 0 100%);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.06);
  object-fit: cover;
  aspect-ratio: 700 / 400;
}

/* --- 04 联系我们简版 --- */
.page-about .about-contact {
  position: relative;
  padding: var(--about-section-gap) var(--content-padding, 1rem);
  background: linear-gradient(0deg, rgba(211, 47, 47, 0.04) 0%, var(--color-bg, #FDF5E6) 100%);
}

.page-about .contact-inner {
  max-width: 720px;
  margin: 0 auto;
  width: 100%;
  box-sizing: border-box;
}

.page-about .contact-intro {
  font-size: 1.05rem;
  color: var(--color-text, #3E2723);
  opacity: 0.78;
  margin: -1rem 0 2rem;
}

.page-about .contact-channels {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  margin-bottom: 1.5rem;
}

.page-about .contact-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.9rem 1.2rem;
  background: var(--color-bg, #FDF5E6);
  border: 1px solid rgba(62, 39, 35, 0.06);
  border-radius: var(--about-card-radius);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%);
  transition: background var(--about-transition);
}

.page-about .contact-item:hover {
  background: rgba(211, 47, 47, 0.04);
}

.page-about .contact-label {
  font-size: 1.4rem;
  flex-shrink: 0;
  width: 2rem;
  text-align: center;
}

.page-about .contact-label-text {
  font-weight: 600;
  font-size: 0.85rem;
  color: var(--color-text, #3E2723);
  opacity: 0.6;
  min-width: 5.5em;
  flex-shrink: 0;
}

.page-about .contact-link {
  color: var(--about-accent-line);
  text-decoration: none;
  font-weight: 500;
  word-break: break-all;
  transition: opacity var(--about-transition);
}

.page-about .contact-link:hover {
  opacity: 0.75;
  text-decoration: underline;
}

.page-about .contact-address {
  color: var(--color-text, #3E2723);
  opacity: 0.82;
  font-size: 0.95rem;
}

.page-about .contact-note {
  font-size: 0.85rem;
  color: var(--color-text, #3E2723);
  opacity: 0.55;
  margin: 0.5rem 0 1.5rem;
  font-style: italic;
}

.page-about .contact-cta {
  text-align: center;
}

.page-about .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.7rem 1.8rem;
  font-family: var(--font-heading, 'Montserrat', 'Exo 2', system-ui, sans-serif);
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition: transform var(--about-transition), box-shadow var(--about-transition);
  border-radius: var(--about-card-radius);
}

.page-about .btn-primary {
  background: var(--about-accent-line);
  color: var(--color-white, #FFFFFF);
}

.page-about .btn-clip {
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%);
}

.page-about .btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 18px rgba(211, 47, 47, 0.25);
}

.page-about .btn:active {
  transform: translateY(0);
}

/* ===== 桌面端媒体查询 ===== */
@media (min-width: 768px) {
  .page-about .story-container {
    flex-direction: row;
    align-items: flex-start;
    gap: 3rem;
  }

  .page-about .story-image-wrap {
    margin-top: 1rem;
  }

  .page-about .feature-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
  }

  .page-about .coverage-container {
    flex-direction: row;
    align-items: flex-start;
    gap: 3rem;
  }

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

  .page-about .coverage-image-wrap {
    order: 2;
    margin-top: 0.5rem;
  }

  .page-about .contact-channels {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
  }

  .page-about .contact-item:last-child {
    grid-column: 1 / -1;
  }

  .page-about .about-hero {
    min-height: 40vh;
  }
}

@media (min-width: 1024px) {
  .page-about .feature-grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .page-about .contact-channels {
    grid-template-columns: 1fr 1fr 1fr;
  }

  .page-about .contact-item:last-child {
    grid-column: auto;
  }

  .page-about .about-story .section-number {
    position: absolute;
    right: 0;
    top: 1rem;
    opacity: 0.1;
    font-size: 8rem;
  }

  .page-about .about-coverage .section-number {
    position: absolute;
    left: -1rem;
    top: 0.5rem;
    opacity: 0.1;
    font-size: 8rem;
  }

  .page-about .about-features .section-number {
    display: block;
    text-align: right;
    margin-bottom: -3rem;
  }

  .page-about .about-contact .section-number {
    display: block;
    text-align: center;
    margin-bottom: -2.5rem;
  }
}

/* ===== 窄屏微调 ===== */
@media (max-width: 480px) {
  .page-about .hero-heading {
    font-size: 1.9rem;
  }

  .page-about .hero-tagline {
    font-size: 1rem;
  }

  .page-about .feature-card {
    padding: 1.25rem 1rem;
  }

  .page-about .contact-item {
    flex-wrap: wrap;
    gap: 0.4rem 0.75rem;
  }

  .page-about .contact-label-text {
    min-width: auto;
  }

  .page-about .story-image,
  .page-about .features-image,
  .page-about .coverage-image {
    clip-path: polygon(0 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%);
  }
}

/* ===== 高分辨率大屏 ===== */
@media (min-width: 1400px) {
  .page-about .about-story {
    padding-left: calc((100vw - var(--content-max, 1200px)) / 2 + var(--content-padding, 1rem));
    padding-right: var(--content-padding, 1rem);
  }

  .page-about .about-coverage {
    padding-left: var(--content-padding, 1rem);
    padding-right: calc((100vw - var(--content-max, 1200px)) / 2 + var(--content-padding, 1rem));
  }
}