/* OpenAI Usage & Cost Analytics Dashboard — theme
   Dark-first, inspired by OpenAI Platform / Datadog / Grafana / Stripe / Vercel. */

:root[data-theme="dark"] {
  --bg: #0b0d12;
  --bg-elevated: #12151c;
  --bg-card: #161a23;
  --border: #262b36;
  --text: #e6e8ec;
  --text-muted: #8b93a3;
  --accent: #7c5cff;
  --accent-soft: rgba(124, 92, 255, 0.15);
  --success: #2ecf7a;
  --warning: #f5a623;
  --danger: #f0506e;
  --info: #4fb2ff;
  --sidebar-width: 240px;
  --sidebar-width-collapsed: 68px;
  --shadow: 0 1px 2px rgba(0,0,0,0.4), 0 8px 24px rgba(0,0,0,0.24);
}

:root[data-theme="light"] {
  --bg: #f5f6f8;
  --bg-elevated: #ffffff;
  --bg-card: #ffffff;
  --border: #e3e6ec;
  --text: #191c22;
  --text-muted: #656d7c;
  --accent: #6a4bfa;
  --accent-soft: rgba(106, 75, 250, 0.10);
  --success: #1b9e5c;
  --warning: #b9770e;
  --danger: #d63a58;
  --info: #2f8fd6;
  --sidebar-width: 240px;
  --sidebar-width-collapsed: 68px;
  --shadow: 0 1px 2px rgba(20,20,40,0.04), 0 6px 18px rgba(20,20,40,0.06);
}

@media (prefers-color-scheme: light) {
  :root:not([data-theme]) { color-scheme: light; }
}

* { box-sizing: border-box; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: "Inter", "Segoe UI", system-ui, -apple-system, sans-serif;
  font-size: 0.9rem;
  margin: 0;
}

a { text-decoration: none; }

.app-shell {
  display: flex;
  min-height: 100vh;
}

/* ---------- Sidebar ---------- */
.sidebar {
  width: var(--sidebar-width);
  background: var(--bg-elevated);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  position: sticky;
  top: 0;
  height: 100vh;
  transition: width 0.15s ease;
  flex-shrink: 0;
  z-index: 1030;
}

.app-shell.collapsed .sidebar { width: var(--sidebar-width-collapsed); }
.app-shell.collapsed .brand-text,
.app-shell.collapsed .sidebar-nav span { display: none; }

.sidebar-brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 1.1rem 1.1rem;
  font-weight: 600;
  font-size: 1.02rem;
  border-bottom: 1px solid var(--border);
  color: var(--text);
  white-space: nowrap;
  overflow: hidden;
}
.sidebar-brand i { color: var(--accent); }

.sidebar-nav {
  display: flex;
  flex-direction: column;
  padding: 0.75rem 0.6rem;
  gap: 0.2rem;
  flex: 1;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  padding: 0.55rem 0.7rem;
  border-radius: 8px;
  color: var(--text-muted);
  font-size: 0.86rem;
  white-space: nowrap;
  overflow: hidden;
}
.nav-link i { width: 1.1rem; text-align: center; }
.nav-link:hover { background: var(--accent-soft); color: var(--text); }
.nav-link.active { background: var(--accent-soft); color: var(--accent); font-weight: 600; }

.sidebar-footer { padding: 0.75rem; border-top: 1px solid var(--border); }

/* ---------- Main ---------- */
.main-content {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
}

.topbar {
  background: var(--bg-elevated);
  border-bottom: 1px solid var(--border);
  z-index: 1020;
}

.topbar-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.65rem 1.25rem;
}

.upload-zone {
  flex: 1;
  border: 1px dashed var(--border);
  border-radius: 10px;
  padding: 0.5rem 1rem;
  display: flex;
  align-items: center;
  gap: 0.6rem;
  color: var(--text-muted);
  font-size: 0.83rem;
  transition: border-color 0.15s, background 0.15s;
}
.upload-zone.dragover { border-color: var(--accent); background: var(--accent-soft); }
.upload-zone i { color: var(--accent); }
.upload-link { color: var(--accent); cursor: pointer; font-weight: 600; }

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-shrink: 0;
}

.filters-row {
  display: flex;
  align-items: flex-end;
  gap: 0.75rem;
  padding: 0 1.25rem 0.75rem;
  flex-wrap: wrap;
}

.filter-group {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  min-width: 130px;
}
.filter-group label {
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-muted);
}
.filter-actions { flex-direction: row; align-items: flex-end; gap: 0.4rem; }

.content-body { padding: 1.25rem; }

/* ---------- Empty state ---------- */
.empty-state {
  text-align: center;
  padding: 5rem 1rem;
  color: var(--text-muted);
}
.empty-state i { font-size: 3rem; color: var(--accent); margin-bottom: 1rem; }
.empty-state h3 { color: var(--text); }

/* ---------- Sections ---------- */
.dash-section { margin-bottom: 2.25rem; scroll-margin-top: 140px; }
.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
}
.section-header h5 { margin: 0; font-weight: 600; }

.budget-input { display: flex; align-items: center; gap: 0.5rem; }
.budget-input label { font-size: 0.75rem; color: var(--text-muted); white-space: nowrap; }
.budget-input input { width: 140px; }

/* ---------- KPI cards ---------- */
.kpi-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(170px, 1fr));
  gap: 0.85rem;
  margin-bottom: 1.5rem;
}
.kpi-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 0.9rem 1rem;
  box-shadow: var(--shadow);
}
.kpi-label {
  font-size: 0.7rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.kpi-value {
  font-size: 1.35rem;
  font-weight: 700;
  margin-top: 0.3rem;
  color: var(--text);
}
.kpi-value.accent { color: var(--accent); }
.kpi-value.success { color: var(--success); }

/* ---------- Charts ---------- */
.chart-grid { display: grid; gap: 1rem; margin-bottom: 1rem; }
.chart-grid.one-col { grid-template-columns: 1fr; }
.chart-grid.two-col { grid-template-columns: repeat(2, 1fr); }
.chart-grid.three-col { grid-template-columns: repeat(3, 1fr); }

@media (max-width: 1100px) {
  .chart-grid.two-col, .chart-grid.three-col { grid-template-columns: 1fr; }
}

.chart-card, .table-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 1rem;
  box-shadow: var(--shadow);
  min-width: 0;
}
.chart-card canvas { max-height: 300px; }
.chart-card-header, .table-card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-weight: 600;
  font-size: 0.85rem;
  margin-bottom: 0.75rem;
  color: var(--text);
}

.mini-stats {
  display: flex;
  justify-content: space-around;
  margin-top: 0.75rem;
  padding-top: 0.6rem;
  border-top: 1px solid var(--border);
  font-size: 0.75rem;
  color: var(--text-muted);
}
.mini-stats b { display: block; color: var(--text); font-size: 0.95rem; }

/* ---------- Heatmap ---------- */
.heatmap-container { overflow-x: auto; }
.heatmap-grid {
  display: grid;
  grid-template-columns: 44px repeat(24, 1fr);
  gap: 2px;
  min-width: 560px;
}
.heatmap-cell {
  aspect-ratio: 1;
  border-radius: 3px;
  background: var(--accent-soft);
}
.heatmap-label {
  font-size: 0.65rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  justify-content: flex-end;
  padding-right: 4px;
}
.heatmap-hour-label {
  font-size: 0.6rem;
  color: var(--text-muted);
  text-align: center;
}

/* ---------- Tables ---------- */
.table-card { overflow-x: auto; }
table.dataTable { color: var(--text) !important; }
table.dataTable thead th {
  color: var(--text-muted);
  border-bottom: 1px solid var(--border) !important;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}
table.dataTable tbody td { border-bottom: 1px solid var(--border) !important; }
.dataTables_wrapper .dataTables_filter input,
.dataTables_wrapper .dataTables_length select {
  background: var(--bg-elevated);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 6px;
}
.dataTables_wrapper .dataTables_info,
.dataTables_wrapper .dataTables_paginate { color: var(--text-muted) !important; }
.model-link, .apikey-link { color: var(--accent); cursor: pointer; font-weight: 600; }
.model-link:hover, .apikey-link:hover { text-decoration: underline; }

/* ---------- Modals ---------- */
.modal-content { background: var(--bg-elevated); color: var(--text); border: 1px solid var(--border); }
.modal-header { border-bottom: 1px solid var(--border); }
.detail-stat-row { display: flex; justify-content: space-between; padding: 0.4rem 0; border-bottom: 1px solid var(--border); }
.detail-stat-row span:first-child { color: var(--text-muted); }

/* ---------- Buttons / badges ---------- */
.btn-outline-secondary { color: var(--text); border-color: var(--border); }
.btn-outline-secondary:hover { background: var(--accent-soft); border-color: var(--accent); color: var(--accent); }
#autoRefreshBtn.active { background: var(--accent-soft); color: var(--accent); border-color: var(--accent); }

/* ---------- Print / PDF ---------- */
@media print {
  .sidebar, .topbar, .empty-state, .btn, .dataTables_filter, .dataTables_paginate { display: none !important; }
  .content-body { padding: 0; }
  body { background: #fff; color: #000; }
}

/* ---------- Responsive ---------- */
@media (max-width: 992px) {
  .sidebar { position: fixed; left: -260px; height: 100vh; }
  .app-shell.mobile-open .sidebar { left: 0; }
  .filters-row { overflow-x: auto; flex-wrap: nowrap; }
}