/* ===== about.html 页面专属样式 ===== */

.company-intro {
  padding: 70px 0;
  background: var(--bg-white);
}

.company-intro-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 50px;
  align-items: center;
}

.company-intro-text h2 {
  font-size: 28px;
  font-weight: 700;
  margin-bottom: 24px;
  color: var(--text-primary);
}

.company-intro-text p {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 2;
  margin-bottom: 16px;
  text-indent: 2em;
}

.company-intro-img {
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 10px 30px rgba(0,0,0,0.1);
}

.company-intro-img img {
  width: 100%;
  height: 400px;
  object-fit: cover;
}

.video-section {
  padding: 70px 0;
  background: var(--bg-light);
}

.video-wrapper {
  max-width: 800px;
  margin: 0 auto;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 10px 40px rgba(0,0,0,0.12);
  position: relative;
  aspect-ratio: 16 / 9;
  background: #000;
  cursor: pointer;
}

.video-wrapper img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.7;
  transition: opacity 0.4s ease;
}

.video-wrapper:hover img {
  opacity: 0.5;
}

.video-play-btn {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 80px;
  height: 80px;
  background: rgba(0,137,207,0.9);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 28px;
  transition: var(--transition);
  box-shadow: 0 4px 20px rgba(0,137,207,0.4);
}

.video-wrapper:hover .video-play-btn {
  transform: translate(-50%, -50%) scale(1.1);
  background: var(--theme-color);
}

.video-label {
  position: absolute;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%);
  color: #fff;
  font-size: 16px;
  font-weight: 600;
  letter-spacing: 2px;
  text-shadow: 0 2px 8px rgba(0,0,0,0.3);
  z-index: 2;
  white-space: nowrap;
}

/* 宣传视频播放器（点击封面后在原位置播放） */
.video-wrapper .video-player {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: contain;
  background: #000;
  display: none;
}

.video-wrapper.playing .video-player {
  display: block;
}

.video-wrapper.playing img,
.video-wrapper.playing .video-play-btn,
.video-wrapper.playing .video-label {
  display: none;
}

.advantages-section {
  padding: 70px 0;
  background: var(--bg-white);
}

.advantages-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 30px;
}

.advantage-card {
  background: var(--bg-light);
  border-radius: 10px;
  padding: 36px 24px;
  text-align: center;
  transition: var(--transition);
  border: 1px solid transparent;
}

.advantage-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 12px 30px rgba(0,137,207,0.12);
  border-color: rgba(0,137,207,0.15);
  background: #fff;
}

.advantage-icon {
  width: 72px;
  height: 72px;
  margin: 0 auto 20px;
  background: var(--theme-color-light);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 30px;
  color: var(--theme-color);
  transition: var(--transition);
}

.advantage-card:hover .advantage-icon {
  background: var(--theme-color);
  color: #fff;
}

.advantage-card h3 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 14px;
  color: var(--text-primary);
}

.advantage-card p {
  font-size: 12px;
  color: var(--text-secondary);
  line-height: 1.9;
}

@media (max-width: 1024px) {
  .company-intro-layout {
    grid-template-columns: 1fr;
    gap: 30px;
  }
  .advantages-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-top {
    grid-template-columns: 1fr 1fr;
  }
  .company-intro-section, .video-section, .advantages-section {
    padding: 50px 0;
  }
  .section-header {
    margin-bottom: 30px;
  }
}

@media (max-width: 768px) {
  .top-bar {
    display: none;
  }
  .nav-inner {
    height: 60px;
    padding: 0 16px;
  }
  .nav-menu {
    position: fixed;
    top: 0;
    right: -280px;
    width: 280px;
    height: 100vh;
    background: #fff;
    flex-direction: column;
    align-items: stretch;
    padding: 70px 0 20px;
    box-shadow: -4px 0 20px rgba(0,0,0,0.1);
    transition: right 0.3s ease;
    z-index: 100;
    overflow-y: auto;
  }
  .nav-menu.open {
    right: 0;
  }
  .nav-menu > li > a {
    padding: 12px 24px;
    line-height: normal;
    font-size: 15px;
    border-bottom: 1px solid #f0f0f0;
  }
  .nav-menu > li .submenu {
    position: static;
    transform: none;
    opacity: 1;
    visibility: visible;
    box-shadow: none;
    border-radius: 0;
    padding: 0 0 0 20px;
  }
  .nav-search {
    margin: 12px 24px;
  }
  .mobile-toggle {
    display: flex;
  }
  .mobile-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.4);
    z-index: 99;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
  }
  .mobile-overlay.visible {
    opacity: 1;
    visibility: visible;
  }
  .inner-banner {
    height: 220px;
  }
  .inner-banner-content h1 {
    font-size: 26px;
  }
  .advantages-grid {
    grid-template-columns: 1fr;
  }
  .footer-top {
    grid-template-columns: 1fr;
  }
  .section-header h2 {
    font-size: 22px;
  }
  .container {
    padding: 0 16px;
  }
  .company-intro-text h2 {
    font-size: 22px;
  }
  .company-intro-text p {
    font-size: 12px;
  }
  .company-intro-img img {
    height: 280px;
  }
  .video-play-btn {
    width: 60px;
    height: 60px;
    font-size: 22px;
  }
  .company-intro-section, .video-section, .advantages-section {
    padding: 40px 0;
  }
  .section-header {
    margin-bottom: 24px;
  }
  .back-to-top {
    bottom: 80px;
    right: 16px;
  }
}

@media (max-width: 480px) {
  .inner-banner {
    height: 180px;
  }
  .inner-banner-content h1 {
    font-size: 22px;
  }
  .breadcrumb {
    font-size: 12px;
  }
  .company-intro-section, .video-section, .advantages-section {
    padding: 30px 0;
  }
  .section-header {
    margin-bottom: 20px;
  }
}