/* =============================================
   layout.css — 整体页面布局
   ============================================= */

.screen {
  position: relative;
  z-index: 1;
  padding: 16px;
  min-height: 100vh;
  display: grid;
  grid-template-rows: 80px 1fr 1fr;
  grid-template-columns: 1fr;
  gap: var(--grid-gap);
  max-width: 1920px;
  margin: 0 auto;
}

/* --- 中部四列 --- */
.row-middle {
  display: grid;
  grid-template-columns: 280px 1fr 1fr 280px;
  gap: var(--grid-gap);
}

/* --- 底部三列 --- */
.row-bottom {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: var(--grid-gap);
}

/* --- 通用面板 --- */
.panel {
  background: var(--bg-card);
  border: 1px solid var(--border-dim);
  border-radius: var(--radius-card);
  padding: 16px 20px;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-blue);
  transition: border-color 0.3s, box-shadow 0.3s;
}
.panel:hover {
  border-color: var(--border-glow);
  box-shadow: var(--shadow-cyan);
}
.panel::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--accent-cyan), transparent);
  opacity: 0.6;
}

/* --- 面板标题栏 --- */
.panel-title {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-secondary);
  letter-spacing: 2px;
  text-transform: uppercase;
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border-dim);
}
.panel-title i { color: var(--accent-cyan); font-size: 14px; }
.panel-badge {
  margin-left: auto;
  font-size: 10px;
  padding: 2px 8px;
  border-radius: 20px;
  background: rgba(0,212,255,0.1);
  border: 1px solid rgba(0,212,255,0.3);
  color: var(--accent-cyan);
  letter-spacing: 1px;
}

/* --- 图表容器 --- */
.chart-container {
  position: relative;
  width: 100%;
  height: calc(100% - 50px);
}

/* --- 响应式 --- */
@media (max-width: 1400px) {
  .row-middle { grid-template-columns: 240px 1fr 1fr 240px; }
}
@media (max-width: 1200px) {
  .row-middle { grid-template-columns: 1fr 1fr; grid-template-rows: 1fr 1fr; }
  .row-bottom  { grid-template-columns: 1fr 1fr; }
}