/* ========================================
   sustainability.css - 可持续发展页面样式
   ======================================== */

.sus-intro { padding: 80px 0; }
.sus-intro-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; }
.sus-intro-content h2 { font-size: 34px; font-weight: 800; margin-bottom: 16px; }
.sus-intro-content p { font-size: 16px; color: var(--text-secondary); line-height: 1.9; margin-bottom: 16px; }
.sus-intro-image { border-radius: var(--radius-lg); overflow: hidden; box-shadow: var(--shadow-lg); }
.sus-intro-image img { width: 100%; height: 380px; object-fit: cover; }

/* ESG体系 */
.esg-section { padding: 20px 0; background: var(--bg-light); }
.esg-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.esg-card {
  background: white;
  border-radius: var(--radius-md);
  padding: 40px 28px;
  text-align: center;
  transition: var(--transition);
  border: 1px solid var(--border-color);
}
.esg-card:hover { box-shadow: var(--shadow-lg); transform: translateY(-5px); border-color: var(--primary); }
.esg-card-icon { font-size: 40px; margin-bottom: 16px; }
.esg-card h3 { font-size: 20px; font-weight: 700; margin-bottom: 12px; }
.esg-card p { font-size: 14px; color: var(--text-secondary); line-height: 1.8; }
.esg-card ul { text-align: left; margin-top: 16px; }
.esg-card li { font-size: 14px; color: var(--text-secondary); padding: 6px 0; border-bottom: 1px solid var(--border-color); display: flex; align-items: center; gap: 8px; }
.esg-card li::before { content: ''; width: 6px; height: 6px; border-radius: 50%; background: var(--secondary); flex-shrink: 0; }

/* 碳中和路径 */
.carbon-section { padding: 50px 0; }
.carbon-timeline { display: flex; gap: 0; justify-content: center; position: relative; flex-wrap: wrap; }
.carbon-timeline::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 10%;
  right: 10%;
  height: 2px;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
}
.carbon-step {
  flex: 1;
  min-width: 180px;
  max-width: 240px;
  text-align: center;
  position: relative;
  padding: 0 12px;
}
.carbon-step-dot {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: white;
  font-size: 18px;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
  position: relative;
  z-index: 2;
}
.carbon-step h4 { font-size: 16px; font-weight: 700; margin-bottom: 6px; }
.carbon-step p { font-size: 13px; color: var(--text-secondary); line-height: 1.6; }

/* 具体行动 */
.actions-section { padding: 100px 0; background: var(--bg-dark); }
.actions-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.action-card {
  display: flex;
  align-items: center;
  gap: 20px;
  padding: 28px;
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius-md);
  transition: var(--transition);
}
.action-card:hover { background: rgba(255,255,255,0.08); }
.action-card-icon {
  width: 56px;
  height: 56px;
  border-radius: 14px;
  background: linear-gradient(135deg, rgba(126,182,59,0.2), rgba(0,200,83,0.15));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  flex-shrink: 0;
}
.action-card-text h4 { font-size: 17px; font-weight: 700; color: white; margin-bottom: 6px; }
.action-card-text p { font-size: 14px; color: rgba(255,255,255,0.6); line-height: 1.7; }

/* ESG报告下载 */
.esg-report { padding: 80px 0; background: var(--bg-light); text-align: center; }
.esg-report-card {
  max-width: 600px;
  margin: 0 auto;
  background: white;
  border-radius: var(--radius-lg);
  padding: 50px 40px;
  box-shadow: var(--shadow-md);
}
.esg-report-card h3 { font-size: 24px; font-weight: 800; margin-bottom: 12px; }
.esg-report-card p { font-size: 15px; color: var(--text-secondary); margin-bottom: 24px; }

/* 响应式 */
@media (max-width: 1024px) {
  .sus-intro-grid { grid-template-columns: 1fr; }
  .esg-grid { grid-template-columns: 1fr; max-width: 500px; margin: 0 auto; }
  .actions-grid { grid-template-columns: 1fr; }
}
@media (max-width: 768px) {
  .sus-intro-content h2 { font-size: 20px; }
  .sus-intro-image img { height: 260px; }
  .carbon-timeline::before { display: none; }
  .carbon-timeline { flex-direction: column; align-items: center; gap: 30px; }
  .carbon-step { max-width: 100%; }
  .esg-report-card { padding: 30px 20px; }
}