/* ========== 关于我们页面专用样式 ========== */

.about-page {
  padding-bottom: 0;
}

/* 公司介绍 */
.intro-section {
  background: linear-gradient(135deg, #1a6b3c 0%, #0d3d22 100%);
  color: #fff;
  padding: 60px 0;
}
.intro-content {
  text-align: center;
}
.intro-content h2 {
  font-size: 32px;
  margin-bottom: 16px;
}
.intro-lead {
  font-size: 18px;
  color: #c8ecd4;
  max-width: 800px;
  margin: 0 auto 40px;
  line-height: 1.8;
}
.intro-stats {
  display: flex;
  justify-content: center;
  gap: 80px;
}
.stat-item {
  text-align: center;
}
.stat-item .num {
  display: block;
  font-size: 42px;
  font-weight: 700;
  color: var(--accent);
}
.stat-item .label {
  font-size: 14px;
  color: #c8ecd4;
}

/* 服务 */
.services-section {
  padding: 60px 0;
}
.services-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.service-item {
  text-align: center;
  padding: 32px 24px;
  background: #fff;
  border-radius: 12px;
  box-shadow: var(--shadow);
  transition: all .2s;
}
.service-item:hover {
  transform: translateY(-5px);
}
.service-icon {
  width: 72px;
  height: 72px;
  background: var(--bg2);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 32px;
  margin: 0 auto 20px;
}
.service-item h4 {
  font-size: 17px;
  color: var(--primary-dark);
  margin-bottom: 12px;
}
.service-item p {
  font-size: 13px;
  color: var(--text2);
  line-height: 1.7;
}

/* 优势 */
.advantages-section {
  padding: 60px 0;
  background: var(--bg);
}
.advantages-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.advantage-card {
  background: #fff;
  padding: 28px;
  border-radius: 12px;
  box-shadow: var(--shadow);
}
.advantage-num {
  font-size: 48px;
  font-weight: 700;
  color: var(--primary);
  opacity: 0.2;
  margin-bottom: 12px;
}
.advantage-card h4 {
  font-size: 16px;
  color: var(--primary-dark);
  margin-bottom: 12px;
}
.advantage-card p {
  font-size: 13px;
  color: var(--text2);
  line-height: 1.7;
}

/* 发展历程 */
.timeline-section {
  padding: 60px 0;
}
.timeline {
  max-width: 700px;
  margin: 0 auto;
  position: relative;
}
.timeline::before {
  content: '';
  position: absolute;
  left: 80px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--border);
}
.timeline-item {
  display: flex;
  margin-bottom: 32px;
}
.timeline-date {
  width: 80px;
  font-size: 14px;
  font-weight: 600;
  color: var(--primary);
  padding-top: 4px;
  text-align: right;
  padding-right: 24px;
  flex-shrink: 0;
}
.timeline-content {
  padding-left: 24px;
  position: relative;
}
.timeline-content::before {
  content: '';
  position: absolute;
  left: -5px;
  top: 8px;
  width: 10px;
  height: 10px;
  background: var(--primary);
  border-radius: 50%;
}
.timeline-content h4 {
  font-size: 15px;
  color: var(--primary-dark);
  margin-bottom: 6px;
}
.timeline-content p {
  font-size: 13px;
  color: var(--text2);
}

/* 联系我们 */
.contact-section {
  padding: 60px 0;
  background: var(--bg);
}
.contact-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.contact-card {
  text-align: center;
  padding: 32px 20px;
}
.contact-icon {
  font-size: 40px;
  margin-bottom: 16px;
}
.contact-card h4 {
  font-size: 15px;
  color: var(--primary-dark);
  margin-bottom: 10px;
}
.contact-card p {
  font-size: 14px;
  color: var(--text);
}
.contact-card .sub {
  font-size: 12px;
  color: #888;
  margin-top: 6px;
}

/* 加入我们 */
.join-section {
  padding: 60px 0;
}
.join-content {
  background: linear-gradient(135deg, #1e3c72 0%, #2a5298 100%);
  color: #fff;
  text-align: center;
  padding: 60px;
}
.join-content h2 {
  font-size: 28px;
  margin-bottom: 12px;
  color: #fff;
}
.join-content p {
  font-size: 16px;
  color: #c8ecd4;
  margin-bottom: 32px;
}
.join-btns {
  display: flex;
  justify-content: center;
  gap: 16px;
}
.join-btns .btn-outline {
  border-color: rgba(255,255,255,0.5);
  color: #fff;
}
.join-btns .btn-outline:hover {
  background: rgba(255,255,255,0.15);
}

/* 返回顶部 */
.back-to-top {
  position: fixed;
  right: 30px;
  bottom: 30px;
  width: 48px;
  height: 48px;
  background: var(--primary);
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  cursor: pointer;
  box-shadow: 0 4px 12px rgba(0,0,0,0.2);
  opacity: 0;
  visibility: hidden;
  transition: all .3s;
  z-index: 1000;
}
.back-to-top:hover {
  background: var(--primary-dark);
  transform: translateY(-3px);
}

/* 响应式 */
@media(max-width: 1024px) {
  .services-grid,
  .advantages-grid,
  .contact-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .intro-stats {
    gap: 40px;
  }
}
@media(max-width: 768px) {
  .intro-stats {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
  }
  .stat-item .num {
    font-size: 32px;
  }
  .timeline::before {
    left: 20px;
  }
  .timeline-date {
    width: 40px;
    font-size: 12px;
    text-align: left;
    padding-right: 16px;
  }
  .join-content {
    padding: 40px 20px;
  }
}
@media(max-width: 600px) {
  .services-grid,
  .advantages-grid,
  .contact-grid {
    grid-template-columns: 1fr;
  }
}