/* ============================================================
   SMART SHIKSHA - ANALYTICS CENTER
   Tabbed chart viewer with summary stat cards
   Inspired by Power BI, Zoho Analytics & ERPNext
   ============================================================ */

/* ===== ANALYTICS CENTER CARD ===== */
.analytics-center {
  background: var(--erp-surface);
  border: 1px solid var(--erp-border);
  border-radius: var(--erp-radius-lg);
  box-shadow: var(--erp-shadow-md);
  overflow: hidden;
  margin-bottom: 24px;
  transition: var(--erp-transition);
}

.analytics-center:hover {
  box-shadow: var(--erp-shadow-lg);
}

/* ===== HEADER ===== */
.analytics-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  padding: 20px 24px;
  border-bottom: 1px solid var(--erp-border-light);
  background: var(--erp-surface);
}

.analytics-title {
  display: flex;
  align-items: center;
  gap: 10px;
}

.analytics-title h3 {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--erp-text);
  margin: 0;
}

.analytics-title .title-icon {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--erp-gradient-blue);
  color: #fff;
  border-radius: var(--erp-radius-sm);
  font-size: 1.15rem;
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.25);
}

.analytics-toolbar {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.analytics-toolbar .form-control-sm,
.analytics-toolbar .form-select-sm {
  height: 34px;
  font-size: 0.8rem;
  padding: 4px 10px;
  min-width: 130px;
  background: var(--erp-surface-alt);
  border: 1px solid var(--erp-border);
  border-radius: var(--erp-radius-sm);
  color: var(--erp-text-secondary);
  cursor: pointer;
}

.analytics-toolbar .form-control-sm:focus,
.analytics-toolbar .form-select-sm:focus {
  border-color: var(--erp-primary);
  box-shadow: var(--erp-shadow-glow);
}

.analytics-toolbar .btn-icon {
  width: 34px;
  height: 34px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--erp-radius-sm);
  background: var(--erp-surface-alt);
  border: 1px solid var(--erp-border);
  color: var(--erp-text-secondary);
  cursor: pointer;
  transition: var(--erp-transition);
  font-size: 0.95rem;
}

.analytics-toolbar .btn-icon:hover {
  background: var(--erp-primary-soft);
  border-color: var(--erp-primary);
  color: var(--erp-primary);
}

.analytics-toolbar .btn-icon:active {
  transform: scale(0.95);
}

/* ===== NAV TABS ===== */
.analytics-tabs {
  display: flex;
  align-items: center;
  gap: 0;
  padding: 0 24px;
  background: var(--erp-surface-alt);
  border-bottom: 1px solid var(--erp-border);
  overflow-x: auto;
  scrollbar-width: none;
  -ms-overflow-style: none;
}

.analytics-tabs::-webkit-scrollbar {
  display: none;
}

.analytics-tab {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 18px;
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--erp-text-secondary);
  cursor: pointer;
  border: none;
  background: transparent;
  border-bottom: 2px solid transparent;
  transition: var(--erp-transition);
  white-space: nowrap;
  position: relative;
  text-decoration: none;
}

.analytics-tab i {
  font-size: 1rem;
  opacity: 0.7;
  transition: var(--erp-transition);
}

.analytics-tab:hover {
  color: var(--erp-primary);
  background: var(--erp-primary-softer);
}

.analytics-tab:hover i {
  opacity: 1;
}

.analytics-tab.active {
  color: var(--erp-primary);
  border-bottom-color: var(--erp-primary);
  background: transparent;
}

.analytics-tab.active i {
  opacity: 1;
}

.analytics-tab .tab-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 20px;
  height: 20px;
  padding: 0 6px;
  border-radius: 10px;
  font-size: 0.675rem;
  font-weight: 600;
  background: var(--erp-primary-soft);
  color: var(--erp-primary);
}

/* ===== TAB CONTENT ===== */
.analytics-panel {
  display: none;
  padding: 20px 24px;
  animation: ac-fade-in 0.35s ease-out;
}

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

@keyframes ac-fade-in {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes ac-slide-in {
  from {
    opacity: 0;
    transform: translateX(20px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

/* ===== STAT CARDS (4 above each chart) ===== */
.analytics-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  margin-bottom: 20px;
}

@media (max-width: 991.98px) {
  .analytics-stats {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 575.98px) {
  .analytics-stats {
    grid-template-columns: 1fr;
  }
}

.analytics-stat {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 14px 16px;
  background: var(--erp-surface-alt);
  border: 1px solid var(--erp-border-light);
  border-radius: var(--erp-radius);
  transition: var(--erp-transition);
}

.analytics-stat:hover {
  background: var(--erp-surface);
  box-shadow: var(--erp-shadow);
  transform: translateY(-2px);
}

.analytics-stat-icon {
  width: 40px;
  height: 40px;
  min-width: 40px;
  border-radius: var(--erp-radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.15rem;
  color: #fff;
}

.analytics-stat-icon.blue { background: var(--erp-gradient-blue); }
.analytics-stat-icon.green { background: var(--erp-gradient-green); }
.analytics-stat-icon.orange { background: var(--erp-gradient-orange); }
.analytics-stat-icon.red { background: var(--erp-gradient-red); }
.analytics-stat-icon.purple { background: var(--erp-gradient-purple); }
.analytics-stat-icon.teal { background: var(--erp-gradient-teal); }
.analytics-stat-icon.pink { background: var(--erp-gradient-pink); }
.analytics-stat-icon.info { background: var(--erp-gradient-indigo); }

.analytics-stat-body {
  flex: 1;
  min-width: 0;
}

.analytics-stat-value {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--erp-text);
  line-height: 1.2;
  margin: 0;
  font-variant-numeric: tabular-nums;
}

.analytics-stat-label {
  font-size: 0.75rem;
  color: var(--erp-text-muted);
  margin: 2px 0 0 0;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.3px;
}

.analytics-stat-change {
  font-size: 0.7rem;
  font-weight: 600;
  margin-top: 4px;
  display: inline-flex;
  align-items: center;
  gap: 3px;
}

.analytics-stat-change.up { color: var(--erp-success); }
.analytics-stat-change.down { color: var(--erp-danger); }

/* ===== CHART CONTAINER ===== */
.analytics-chart-container {
  background: var(--erp-surface);
  border: 1px solid var(--erp-border-light);
  border-radius: var(--erp-radius);
  padding: 16px;
  min-height: 320px;
  position: relative;
}

.analytics-chart-container .chart-loading {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255,255,255,0.6);
  border-radius: var(--erp-radius);
  z-index: 5;
  transition: opacity 0.3s;
}

[data-bs-theme="dark"] .analytics-chart-container .chart-loading,
body.dark-mode .analytics-chart-container .chart-loading {
  background: rgba(30, 41, 59, 0.8);
}

.analytics-chart-container .chart-loading.hidden {
  opacity: 0;
  pointer-events: none;
}

.analytics-chart-container .chart-loading .spinner-border {
  width: 2.5rem;
  height: 2.5rem;
}

/* ===== CHART WRAPPER ===== */
.analytics-chart {
  width: 100%;
  min-height: 300px;
}

/* ===== EMPTY STATE ===== */
.analytics-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 60px 20px;
  text-align: center;
  color: var(--erp-text-muted);
}

.analytics-empty i {
  font-size: 3rem;
  margin-bottom: 16px;
  opacity: 0.4;
}

.analytics-empty h5 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--erp-text-secondary);
  margin-bottom: 6px;
}

.analytics-empty p {
  font-size: 0.85rem;
  margin: 0;
}

/* ===== REFRESH ANIMATION ===== */
.btn-icon.ac-spinning i {
  animation: ac-spin 0.6s linear;
}

@keyframes ac-spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

/* ===== FULLSCREEN MODE ===== */
.analytics-center.fullscreen {
  position: fixed;
  inset: 0;
  z-index: 9999;
  border-radius: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
}

.analytics-center.fullscreen .analytics-panel.active {
  flex: 1;
  overflow-y: auto;
}

.analytics-center.fullscreen .analytics-chart-container {
  min-height: 500px;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 767.98px) {
  .analytics-header {
    padding: 14px 16px;
  }

  .analytics-title h3 {
    font-size: 1rem;
  }

  .analytics-tabs {
    padding: 0 12px;
  }

  .analytics-tab {
    padding: 10px 12px;
    font-size: 0.78rem;
  }

  .analytics-tab .tab-badge {
    display: none;
  }

  .analytics-panel {
    padding: 14px 12px;
  }

  .analytics-stat {
    padding: 10px 12px;
  }

  .analytics-stat-value {
    font-size: 1.1rem;
  }

  .analytics-toolbar .form-control-sm,
  .analytics-toolbar .form-select-sm {
    min-width: 100px;
    font-size: 0.75rem;
  }
}

@media (max-width: 575.98px) {
  .analytics-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .analytics-toolbar {
    width: 100%;
    justify-content: flex-start;
  }

  .analytics-toolbar .form-select-sm {
    flex: 1;
    min-width: 0;
  }
}

/* ===== LOADING SKELETON ===== */
.analytics-skeleton {
  display: grid;
  gap: 12px;
}

.analytics-skeleton-row {
  height: 40px;
  background: linear-gradient(90deg, var(--erp-border-light) 25%, var(--erp-border) 50%, var(--erp-border-light) 75%);
  background-size: 1000px 100%;
  animation: erp-shimmer 2s infinite linear;
  border-radius: var(--erp-radius-sm);
}