/* ============================================================
 * 降本增效 · 数据可视化专区
 * 针对垃圾焚烧发电厂运营降本的量化数据展示
 * ============================================================ */

.roi-section {
  background: linear-gradient(170deg, #1b3a26 0%, #0d2818 50%, #162e20 100%);
  color: #fff;
  position: relative;
  overflow: hidden;
}

.roi-section::before {
  content: '';
  position: absolute;
  top: -200px; right: -200px;
  width: 600px; height: 600px;
  background: radial-gradient(circle, rgba(46,125,50,0.12) 0%, transparent 70%);
  pointer-events: none;
}

.roi-section .section-title { color: #fff; }
.roi-section .section-subtitle { color: rgba(255,255,255,0.6); }

/* ===== 场景标题栏 ===== */
.roi-scenario {
  text-align: center;
  margin-bottom: 40px;
}

.roi-scenario-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(76, 175, 80, 0.12);
  border: 1px solid rgba(76, 175, 80, 0.25);
  border-radius: 30px;
  padding: 8px 24px;
  font-size: 15px;
  color: #81c784;
  font-weight: 500;
  margin-bottom: 10px;
}

.roi-scenario h3 {
  font-size: 26px;
  font-weight: 800;
  color: #fff;
  margin-bottom: 6px;
}

.roi-scenario p {
  font-size: 14px;
  color: rgba(255,255,255,0.5);
}

/* ===== 核心数据卡片组 ===== */
.roi-metrics {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-bottom: 48px;
}

.roi-metric-card {
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 16px;
  padding: 28px 24px;
  text-align: center;
  transition: all 0.4s ease;
  position: relative;
  overflow: hidden;
}

.roi-metric-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: var(--gradient-primary);
  opacity: 0;
  transition: opacity 0.4s ease;
}

.roi-metric-card:hover {
  background: rgba(255,255,255,0.08);
  border-color: rgba(76, 175, 80, 0.3);
  transform: translateY(-4px);
}

.roi-metric-card:hover::before {
  opacity: 1;
}

.roi-metric-value {
  font-size: 42px;
  font-weight: 900;
  background: linear-gradient(135deg, #66bb6a, #26a69a);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  line-height: 1.1;
  margin-bottom: 4px;
}

.roi-metric-value .unit {
  font-size: 18px;
  font-weight: 600;
}

.roi-metric-label {
  font-size: 14px;
  color: rgba(255,255,255,0.55);
  margin-bottom: 10px;
}

.roi-metric-detail {
  font-size: 12px;
  color: rgba(255,255,255,0.35);
  line-height: 1.5;
}

/* ===== 对比条 ===== */
.roi-compare {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin-bottom: 48px;
}

.roi-compare-card {
  background: rgba(255,255,255,0.03);
  border: 1px solid rgba(255,255,255,0.07);
  border-radius: 20px;
  padding: 32px;
  position: relative;
}

.roi-compare-card--old {
  border-color: rgba(239, 83, 80, 0.15);
}

.roi-compare-card--new {
  border-color: rgba(76, 175, 80, 0.2);
  background: rgba(76, 175, 80, 0.04);
}

.roi-compare-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 24px;
}

.roi-compare-dot {
  width: 10px; height: 10px;
  border-radius: 50%;
  flex-shrink: 0;
}

.roi-compare-card--old .roi-compare-dot { background: #ef5350; }
.roi-compare-card--new .roi-compare-dot { background: #66bb6a; }

.roi-compare-header h4 {
  font-size: 16px;
  font-weight: 700;
  color: #fff;
}

.roi-compare-header span {
  font-size: 12px;
  color: rgba(255,255,255,0.4);
  margin-left: auto;
}

/* 对比项 */
.roi-bar-group {
  margin-bottom: 18px;
}

.roi-bar-label {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 6px;
}

.roi-bar-label span:first-child {
  font-size: 13px;
  color: rgba(255,255,255,0.65);
}

.roi-bar-label span:last-child {
  font-size: 13px;
  font-weight: 700;
  color: #fff;
}

.roi-bar-track {
  width: 100%;
  height: 8px;
  background: rgba(255,255,255,0.06);
  border-radius: 4px;
  overflow: hidden;
}

.roi-bar-fill {
  height: 100%;
  border-radius: 4px;
  transition: width 1.5s cubic-bezier(0.4, 0, 0.2, 1);
  width: 0;
}

/* .roi-bar-fill 宽度由 JS IntersectionObserver 触发 */

.roi-compare-card--old .roi-bar-fill {
  background: linear-gradient(90deg, #ef5350, #ff7043);
}

.roi-compare-card--new .roi-bar-fill {
  background: linear-gradient(90deg, #43a047, #26a69a);
}

/* ===== 年度收益汇总条 ===== */
.roi-summary {
  background: linear-gradient(135deg, rgba(46,125,50,0.15), rgba(0,137,123,0.1));
  border: 1px solid rgba(76, 175, 80, 0.2);
  border-radius: 20px;
  padding: 32px 40px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.roi-summary-left h4 {
  font-size: 14px;
  color: rgba(255,255,255,0.6);
  font-weight: 400;
  margin-bottom: 6px;
}

.roi-summary-amount {
  font-size: 48px;
  font-weight: 900;
  background: linear-gradient(135deg, #66bb6a, #ffd54f);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  line-height: 1.1;
}

.roi-summary-amount .approx {
  font-size: 20px;
  font-weight: 600;
}

.roi-summary-items {
  display: flex;
  gap: 32px;
}

.roi-summary-item {
  text-align: center;
}

.roi-summary-item-value {
  font-size: 22px;
  font-weight: 800;
  color: #81c784;
  line-height: 1.2;
}

.roi-summary-item-label {
  font-size: 12px;
  color: rgba(255,255,255,0.45);
  margin-top: 4px;
}

/* ===== 响应式 ===== */
@media (max-width: 992px) {
  .roi-metrics { grid-template-columns: repeat(2, 1fr); }
  .roi-compare { grid-template-columns: 1fr; }
  .roi-summary { flex-direction: column; gap: 24px; text-align: center; }
  .roi-summary-items { justify-content: center; }
}

@media (max-width: 768px) {
  .roi-metrics { grid-template-columns: 1fr; }
  .roi-summary-amount { font-size: 36px; }
}