* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", system-ui, sans-serif;
  background: #f6f7fb;
  color: #1f2d3d;
}

.app-header {
  padding: 24px 32px 12px;
  background: linear-gradient(120deg, #1f2d3d, #283e51);
  color: #fff;
}

.app-header h1 {
  margin: 0 0 4px;
  font-size: 28px;
}

.app-header .sub {
  opacity: 0.8;
}

.tabs {
  display: flex;
  gap: 8px;
  padding: 12px 24px 0;
}

.tab-button {
  border: none;
  padding: 10px 16px;
  background: #e1e8f0;
  border-radius: 10px 10px 0 0;
  cursor: pointer;
  font-weight: 600;
  color: #1f2d3d;
}

.tab-button.active {
  background: #ffffff;
  box-shadow: 0 -2px 8px rgba(31, 45, 61, 0.1);
}

.tab-content {
  padding: 0 24px 24px;
}

.tab-panel {
  display: none;
}

.tab-panel.active {
  display: block;
}

.content-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 20px;
  align-items: start;
}

.stack {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

.panel {
  background: #fff;
  border-radius: 16px;
  padding: 16px;
  box-shadow: 0 10px 30px rgba(31, 45, 61, 0.08);
}

.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 12px;
}

.panel-header-group {
  display: flex;
  align-items: center;
  gap: 10px;
}

.panel-header h2 {
  margin: 0;
  font-size: 18px;
}

.panel-header input[type="search"] {
  border: 1px solid #d5ddea;
  border-radius: 8px;
  padding: 8px 12px;
  min-width: 180px;
}

.table-wrapper {
  overflow: auto;
  max-height: 70vh;
}

#batteryTable {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}

#compareTable {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}

#batteryTable thead {
  position: sticky;
  top: 0;
  background: #f2f5fa;
  z-index: 1;
}

#compareTable thead {
  position: sticky;
  top: 0;
  background: #f2f5fa;
  z-index: 1;
}

#batteryTable th,
#batteryTable td {
  padding: 8px 10px;
  border-bottom: 1px solid #edf0f5;
  text-align: left;
  white-space: nowrap;
}

#compareTable th,
#compareTable td {
  padding: 8px 10px;
  border-bottom: 1px solid #edf0f5;
  text-align: left;
  white-space: nowrap;
}

#batteryTable th {
  cursor: pointer;
  user-select: none;
  font-weight: 600;
  color: #3c4b64;
}

#compareTable th {
  user-select: none;
  font-weight: 600;
  color: #3c4b64;
}

#compareTable .filter-row th {
  background: #f7f9fc;
}

.compare-filter {
  width: 100%;
  padding: 6px 8px;
  border: 1px solid #d5ddea;
  border-radius: 6px;
  font-size: 12px;
}

#compareTable th[data-key] {
  cursor: pointer;
  position: relative;
  padding-right: 22px;
}

#compareTable th[data-key]::after {
  content: "↕";
  position: absolute;
  right: 8px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 20px;
  color: #9aa5b1;
}

#compareTable th.sort-asc::after {
  content: "↑";
  color: #0346ab;
}

#compareTable th.sort-desc::after {
  content: "↓";
  color: #0346ab;
}

#batteryTable tbody tr:hover {
  background: #f9fbff;
}

#compareTable tbody tr:hover {
  background: #f9fbff;
}

.graph-btn {
  border: none;
  padding: 6px 10px;
  border-radius: 8px;
  background: #1f78ff;
  color: #fff;
  cursor: pointer;
  font-size: 12px;
}

.ghost-btn {
  border: 1px solid #d5ddea;
  padding: 6px 10px;
  border-radius: 8px;
  background: #ffffff;
  color: #1f2d3d;
  cursor: pointer;
  font-size: 12px;
}

.plot {
  width: 100%;
  min-height: 460px;
}

.plot-meta {
  font-size: 13px;
  color: #5c6b80;
}

.plot-meta-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
  align-items: flex-end;
}

.plot-progress {
  width: 220px;
  height: 8px;
  accent-color: #1f78ff;
  visibility: hidden;
}

.env-hint {
  margin-top: 16px;
  padding: 12px;
  background: #f4f6fb;
  border-radius: 12px;
  color: #4a5a75;
}

@media (max-width: 1100px) {
  .content-grid {
    grid-template-columns: 1fr;
  }
}