:root {
  --bg-primary: #131722;
  --bg-secondary: #1e222d;
  --bg-card: #242936;
  --bg-hover: #2a3040;
  --border-color: rgba(255, 255, 255, 0.08);
  --text-primary: #e0e3eb;
  --text-secondary: #848e9c;
  --text-muted: #5e6673;
  --color-up: #eb5757;
  --color-down: #27ae60;
  --color-accent: #2962ff;
  --color-accent-light: rgba(41, 98, 255, 0.15);
  --shadow-sm: 0 2px 6px rgba(0, 0, 0, 0.25);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.35);
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
}

html, body {
  min-height: 100%;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}

/* Glassmorphism Navbar */
.navbar-custom {
  background-color: rgba(24, 27, 36, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 1020;
}

.brand-badge {
  font-size: 0.72rem;
  letter-spacing: 0.5px;
  background: var(--color-accent-light);
  color: #70a1ff;
  border: 1px solid rgba(41, 98, 255, 0.3);
  padding: 2px 8px;
  border-radius: 12px;
  margin-left: 8px;
  vertical-align: middle;
}

.nav-link-custom {
  color: var(--text-secondary);
  font-weight: 500;
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  transition: all 0.2s ease;
  text-decoration: none;
}

.nav-link-custom:hover {
  color: #fff;
  background-color: rgba(255, 255, 255, 0.06);
}

/* Main Container Layout */
main.dashboard-container {
  padding: 1.5rem 0 3rem;
  min-height: calc(100vh - 140px);
}

/* KPI Summary Cards Grid */
.kpi-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  gap: 14px;
  margin-bottom: 1.5rem;
}

.kpi-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 16px 18px;
  box-shadow: var(--shadow-sm);
  transition: transform 0.2s ease, border-color 0.2s ease;
  position: relative;
  overflow: hidden;
}

.kpi-card:hover {
  transform: translateY(-2px);
  border-color: rgba(255, 255, 255, 0.16);
}

.kpi-title {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 6px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.kpi-title .badge-tag {
  font-size: 0.7rem;
  padding: 1px 6px;
  border-radius: 4px;
  font-weight: normal;
}

.kpi-value {
  font-size: 1.45rem;
  font-weight: 700;
  color: #fff;
  line-height: 1.2;
  margin-bottom: 4px;
  font-variant-numeric: tabular-nums;
}

.kpi-sub {
  font-size: 0.8rem;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 4px;
  font-variant-numeric: tabular-nums;
}

.val-up {
  color: var(--color-up) !important;
}

.val-down {
  color: var(--color-down) !important;
}

.val-neutral {
  color: var(--text-secondary) !important;
}

/* Chart Container Cards */
.chart-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  margin-bottom: 1.5rem;
  overflow: hidden;
}

.chart-card-header {
  padding: 14px 20px;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  background-color: rgba(255, 255, 255, 0.02);
}

.chart-title-area h5 {
  font-size: 1.05rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 2px;
}

.chart-title-area p {
  font-size: 0.78rem;
  color: var(--text-secondary);
  margin-bottom: 0;
}

.chart-controls {
  display: flex;
  align-items: center;
  gap: 6px;
}

.range-btn {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.15s ease;
}

.range-btn:hover {
  background: rgba(255, 255, 255, 0.12);
  color: #fff;
}

.range-btn.active {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: #fff;
}

.chart-card-body {
  position: relative;
  min-height: 500px;
  padding: 10px 8px;
}

#container_stock {
  width: 100%;
  height: 820px;
}

#container_MTX {
  width: 100%;
  height: 600px;
}

/* Skeleton Loading Screen */
.skeleton-box {
  background: linear-gradient(90deg, #1e222d 25%, #2a3040 37%, #1e222d 63%);
  background-size: 400% 100%;
  animation: skeleton-loading 1.4s ease infinite;
  border-radius: var(--radius-sm);
}

@keyframes skeleton-loading {
  0% {
    background-position: 100% 50%;
  }
  100% {
    background-position: 0 50%;
  }
}

.skeleton-chart {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 5;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  padding: 2rem;
}

.skeleton-spinner {
  width: 42px;
  height: 42px;
  border: 3px solid rgba(255, 255, 255, 0.1);
  border-top-color: var(--color-accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin-bottom: 12px;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* Error State Banner */
.error-banner {
  display: none;
  background: rgba(235, 87, 87, 0.12);
  border: 1px solid rgba(235, 87, 87, 0.3);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  margin-bottom: 1.5rem;
  color: #ff8b8b;
}

/* Footer Polish */
footer.footer-custom {
  background-color: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  padding: 2rem 0;
  color: var(--text-secondary);
  font-size: 0.85rem;
}

#toTopBtn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  text-decoration: none;
  transition: all 0.2s ease;
}

#toTopBtn:hover {
  background-color: var(--color-accent);
  color: #fff;
  border-color: var(--color-accent);
}

/* Responsive Tweaks */
@media (max-width: 768px) {
  .kpi-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
  }
  .kpi-value {
    font-size: 1.2rem;
  }
  #container_stock {
    height: 640px;
  }
  #container_MTX {
    height: 480px;
  }
  .chart-card-header {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (max-width: 480px) {
  .kpi-grid {
    grid-template-columns: 1fr;
  }
}