:root {
  --bg: #0b1220;
  --panel: #111827;
  --panel-2: #0f172a;
  --panel-3: #1e293b;
  --border: #334155;
  --border-strong: #475569;
  --text: #e5e7eb;
  --text-dim: #94a3b8;
  --text-muted: #64748b;
  --accent: #38bdf8;
  --accent-2: #f59e0b;
  --danger: #ef4444;
  --ok: #4ade80;
}

* { box-sizing: border-box; }

html, body, #root {
  margin: 0;
  padding: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: Inter, "Segoe UI", system-ui, Arial, sans-serif;
  font-size: 13px;
  line-height: 1.4;
}

.app-shell {
  max-width: 1180px;
  margin: 0 auto;
  padding: 12px;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 14px;
  background: linear-gradient(90deg, #0f172a, #111827);
  border: 1px solid var(--border);
  border-radius: 6px 6px 0 0;
  font-size: 14px;
}
.app-title { font-weight: 600; letter-spacing: 0.02em; }
.app-logo  { margin-right: 8px; color: var(--accent); }

.app-header-meta { display: flex; gap: 6px; }

.pill {
  display: inline-block;
  padding: 2px 8px;
  font-size: 11px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  color: var(--text-dim);
  background: var(--panel-2);
}

/* Tab strip */
.tab-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 2px;
  padding: 0;
  margin: 0;
  background: var(--panel-2);
  border-left: 1px solid var(--border);
  border-right: 1px solid var(--border);
}
.tab {
  padding: 8px 14px;
  background: transparent;
  color: var(--text-dim);
  border: none;
  border-right: 1px solid var(--border);
  cursor: pointer;
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.01em;
}
.tab:hover { color: var(--text); background: var(--panel-3); }
.tab-active {
  color: var(--text);
  background: var(--panel);
  border-bottom: 2px solid var(--accent);
}

/* Tab body */
.tab-body {
  flex: 1;
  background: var(--panel);
  border: 1px solid var(--border);
  border-top: none;
  border-radius: 0 0 6px 6px;
  padding: 14px;
  min-height: 520px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

/* Fieldset */
.panel-fieldset {
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 12px 14px;
  background: var(--panel-2);
  margin: 0;
}
.panel-fieldset legend {
  padding: 0 6px;
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-dim);
}

.panel-note {
  font-size: 12px;
  color: var(--text-dim);
  margin: 4px 0 8px 0;
}
.panel-note code { background: var(--panel-3); padding: 1px 4px; border-radius: 3px; }

/* Label+input row */
.panel-row {
  display: grid;
  grid-template-columns: 200px 1fr;
  align-items: center;
  gap: 10px;
  margin-bottom: 8px;
}
.panel-row label { font-size: 12px; color: var(--text-dim); }
.panel-row-input { display: flex; flex-direction: column; gap: 3px; }
.panel-row-hint { font-size: 11px; color: var(--text-muted); }

.tab-grid { display: grid; gap: 12px; }
.tab-grid.two   { grid-template-columns: 1fr 1fr; }
.tab-grid.three { grid-template-columns: 1fr 1fr 1fr; }

@media (max-width: 880px) {
  .tab-grid.two, .tab-grid.three { grid-template-columns: 1fr; }
  .panel-row { grid-template-columns: 140px 1fr; }
}

/* Inputs */
.panel-input {
  width: 100%;
  padding: 6px 8px;
  background: var(--panel-3);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 4px;
  font: inherit;
  font-size: 12px;
}
.panel-input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 2px rgba(56,189,248,0.15);
}
.panel-input:disabled { opacity: 0.5; cursor: not-allowed; }

.panel-checkbox { display: inline-flex; align-items: center; gap: 6px; }

.panel-radio-group { display: flex; flex-wrap: wrap; gap: 12px; }
.panel-radio { display: inline-flex; align-items: center; gap: 6px; font-size: 12px; }

/* Buttons */
.btn {
  padding: 6px 12px;
  background: var(--panel-3);
  color: var(--text);
  border: 1px solid var(--border-strong);
  border-radius: 4px;
  font: inherit;
  font-size: 12px;
  cursor: pointer;
  white-space: nowrap;
  transition: background 0.12s ease, border-color 0.12s ease;
}
.btn:hover { background: #243448; border-color: var(--accent); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }
.btn-primary  { background: #0ea5e9; border-color: #0284c7; color: #001018; font-weight: 600; }
.btn-primary:hover { background: #38bdf8; border-color: #0ea5e9; }
.btn-danger   { color: #fecaca; border-color: #7f1d1d; background: transparent; padding: 2px 8px; font-size: 11px; }
.btn-danger:hover { background: #7f1d1d; color: #fff; border-color: #991b1b; }
.btn-secondary { background: var(--panel-3); }

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  align-items: center;
  margin: 4px 0 8px 0;
}
.action-row { display: flex; justify-content: flex-end; gap: 8px; padding-top: 10px; }

/* Tables */
.table-scroll {
  max-height: 380px;
  overflow: auto;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: var(--panel-3);
}
.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 12px;
}
.data-table thead th {
  position: sticky;
  top: 0;
  background: var(--panel);
  text-align: left;
  padding: 6px 8px;
  border-bottom: 1px solid var(--border);
  font-weight: 600;
  color: var(--text-dim);
  z-index: 1;
}
.data-table tbody td {
  padding: 3px 6px;
  border-bottom: 1px solid var(--border);
  vertical-align: middle;
}
.data-table tbody tr.row-selected td {
  background: rgba(56, 189, 248, 0.16);
}
.data-table tbody tr[role="button"]:focus-visible td {
  outline: 1px solid #38bdf8;
  outline-offset: -1px;
  background: rgba(56, 189, 248, 0.1);
}
.data-table tbody td .panel-input { padding: 3px 6px; font-size: 11px; }
.data-table .empty-row { text-align: center; color: var(--text-muted); padding: 18px; }

/* KPI grid */
.kpi-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
}
.kpi-cell {
  background: var(--panel-3);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 8px 10px;
}
.kpi-label {
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 3px;
}
.kpi-val { font-size: 14px; font-weight: 600; color: var(--text); }

@media (max-width: 900px) { .kpi-grid { grid-template-columns: repeat(2, 1fr); } }

/* Callouts */
.callout {
  padding: 10px 12px;
  border-radius: 4px;
  background: var(--panel-3);
  border-left: 3px solid var(--border-strong);
  font-size: 12px;
}
.callout-info  { border-left-color: var(--accent); }
.callout-error { border-left-color: var(--danger); color: #fca5a5; }
.callout-warning { border-left-color: var(--accent-2); color: #fcd34d; }

.warning-list { margin: 0; padding-left: 16px; color: #fcd34d; font-size: 12px; }
.warning-list li { margin-bottom: 3px; }

.mono-block {
  font-family: "JetBrains Mono", "Fira Code", "Courier New", monospace;
  font-size: 11px;
  background: var(--panel-3);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 8px;
  max-height: 280px;
  overflow: auto;
  white-space: pre-wrap;
}

.advanced-textarea {
  width: 100%;
  margin-top: 8px;
  padding: 8px;
  font-family: "JetBrains Mono", "Fira Code", "Courier New", monospace;
  font-size: 11px;
  background: var(--panel-3);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 4px;
  resize: vertical;
}

/* Status bar */
.app-statusbar {
  display: flex;
  gap: 16px;
  padding: 6px 12px;
  margin-top: 8px;
  font-size: 11px;
  color: var(--text-dim);
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 4px;
}

/* Spinner */
.spinner {
  display: inline-block;
  width: 10px;
  height: 10px;
  border: 2px solid var(--border-strong);
  border-top-color: var(--accent);
  border-radius: 50%;
  margin-right: 6px;
  vertical-align: -2px;
  animation: spin 0.75s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* uPlot palette overrides for dark theme */
.uplot-host .u-legend { color: var(--text-dim); font-size: 11px; }
.uplot-host .u-wrap   { background: var(--panel-3); }

/* 3D wellbore */
.wellbore-3d-wrap {
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--panel-3);
  padding: 8px;
}
.wellbore-3d {
  width: 100%;
  height: auto;
  display: block;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: #020617;
}
.wellbore-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 8px;
  font-size: 11px;
  color: var(--text-dim);
}
.wellbore-legend span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.wellbore-legend i {
  width: 12px;
  height: 12px;
  border-radius: 2px;
  display: inline-block;
  border: 1px solid rgba(255, 255, 255, 0.2);
}
.wellbore-kpis {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 6px;
  font-size: 11px;
  color: var(--text-dim);
}