:root {
  --bg: #f4f5f7;
  --bg-raised: #ffffff;
  --bg-subtle: #eceef2;
  --bg-hover: #e4e7ec;
  --bg-selected: #e6efff;
  --border: #d8dbe0;
  --border-strong: #b4b9c2;
  --text: #1f2430;
  --text-muted: #5b6170;
  --text-subtle: #848b99;
  --primary: #2b5bd7;
  --primary-hover: #1f47b0;
  --primary-soft: #e6efff;
  --accent: #00897b;
  --warning: #c77700;
  --warning-soft: #fff4e0;
  --danger: #c0392b;
  --danger-soft: #fde4e1;
  --success: #2e7d44;
  --success-soft: #e2f1e6;
  --info: #2b5bd7;

  --shadow-sm: 0 1px 2px rgba(18, 26, 47, 0.06);
  --shadow: 0 2px 6px rgba(18, 26, 47, 0.08), 0 1px 2px rgba(18, 26, 47, 0.04);
  --shadow-lg: 0 10px 24px rgba(18, 26, 47, 0.10), 0 2px 6px rgba(18, 26, 47, 0.06);

  --r-sm: 4px;
  --r: 6px;
  --r-lg: 10px;

  --sidebar-w: 240px;
  --topbar-h: 52px;

  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  font-family: var(--font-sans);
  font-size: 13.5px;
  line-height: 1.45;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4, h5 { margin: 0; font-weight: 600; letter-spacing: -0.01em; }
h1 { font-size: 20px; }
h2 { font-size: 16px; }
h3 { font-size: 14px; }
h4 { font-size: 13px; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.04em; }

a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

/* === App shell ===================================================== */
.app {
  display: grid;
  grid-template-columns: var(--sidebar-w) 1fr;
  grid-template-rows: var(--topbar-h) 1fr;
  grid-template-areas:
    "sidebar topbar"
    "sidebar main";
  min-height: 100vh;
}

.sidebar {
  grid-area: sidebar;
  background: #1c2230;
  color: #c8cdd8;
  padding: 16px 0;
  display: flex;
  flex-direction: column;
  border-right: 1px solid #151a25;
}

.sidebar-brand {
  padding: 0 18px 16px 18px;
  font-size: 17px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: #fff;
  display: flex;
  align-items: center;
  gap: 8px;
  border-bottom: 1px solid #2a3142;
  margin-bottom: 10px;
}

.sidebar-brand .dot {
  width: 10px; height: 10px;
  background: #4f8cff;
  border-radius: 50%;
}

.sidebar-section {
  padding: 10px 12px 4px 18px;
  font-size: 10.5px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: #6b7388;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 7px 18px;
  color: #c8cdd8;
  cursor: pointer;
  font-size: 13px;
  border-left: 2px solid transparent;
}
.nav-item:hover {
  background: #252c3d;
  color: #fff;
  text-decoration: none;
}
.nav-item.active {
  background: #252c3d;
  color: #fff;
  border-left-color: var(--primary);
}
.nav-item .icon {
  width: 16px; height: 16px;
  display: inline-flex;
  align-items: center; justify-content: center;
  font-size: 14px;
  opacity: 0.9;
}

.topbar {
  grid-area: topbar;
  background: var(--bg-raised);
  border-bottom: 1px solid var(--border);
  padding: 0 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.breadcrumbs {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: var(--text-muted);
}
.breadcrumbs a { color: var(--text-muted); }
.breadcrumbs a:hover { color: var(--primary); }
.breadcrumbs .sep { color: var(--border-strong); }
.breadcrumbs .current { color: var(--text); font-weight: 500; }

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.user-chip {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 4px 10px 4px 4px;
  background: var(--bg-subtle);
  border-radius: 999px;
  font-size: 12.5px;
}
.avatar {
  width: 26px; height: 26px;
  border-radius: 50%;
  background: var(--primary);
  color: #fff;
  display: inline-flex;
  align-items: center; justify-content: center;
  font-size: 11px; font-weight: 600;
}

.main {
  grid-area: main;
  padding: 20px;
  overflow: auto;
}

.page-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 16px;
  flex-wrap: wrap;
}
.page-header .title-block h1 { margin-bottom: 4px; }
.page-header .subtitle { color: var(--text-muted); font-size: 13px; }

/* === Cards & panels ================================================ */
.card {
  background: var(--bg-raised);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  box-shadow: var(--shadow-sm);
}
.card-header {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}
.card-body { padding: 16px; }
.card-footer {
  padding: 10px 16px;
  border-top: 1px solid var(--border);
  background: var(--bg-subtle);
  border-radius: 0 0 var(--r-lg) var(--r-lg);
}

/* === Buttons ======================================================= */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border: 1px solid var(--border-strong);
  background: var(--bg-raised);
  color: var(--text);
  border-radius: var(--r);
  font-size: 12.5px;
  font-weight: 500;
  cursor: pointer;
  font-family: inherit;
  transition: all .12s ease;
}
.btn:hover { background: var(--bg-hover); }
.btn.primary {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}
.btn.primary:hover { background: var(--primary-hover); border-color: var(--primary-hover); }
.btn.ghost { background: transparent; border-color: transparent; }
.btn.ghost:hover { background: var(--bg-hover); }
.btn.danger { color: var(--danger); border-color: transparent; background: transparent; }
.btn.danger:hover { background: var(--danger-soft); }
.btn.sm { padding: 3px 8px; font-size: 11.5px; }
.btn.lg { padding: 8px 16px; font-size: 13.5px; }
.btn[disabled] { opacity: 0.5; cursor: not-allowed; }

/* === Form controls ================================================= */
.input, .select, textarea.input {
  width: 100%;
  padding: 6px 10px;
  border: 1px solid var(--border);
  border-radius: var(--r);
  background: var(--bg-raised);
  font-family: inherit;
  font-size: 13px;
  color: var(--text);
  transition: border-color .12s ease, box-shadow .12s ease;
}
.input:focus, .select:focus, textarea.input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-soft);
}
label { font-size: 12px; color: var(--text-muted); display: block; margin-bottom: 3px; }
.form-row { margin-bottom: 12px; }
.form-row-inline { display: flex; gap: 10px; }
.form-row-inline > * { flex: 1; }

.search-input {
  position: relative;
  display: flex;
  align-items: center;
}
.search-input::before {
  content: '';
  position: absolute;
  left: 10px;
  width: 14px; height: 14px;
  background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%235b6170' stroke-width='2'%3E%3Ccircle cx='11' cy='11' r='7'/%3E%3Cline x1='21' y1='21' x2='16.65' y2='16.65'/%3E%3C/svg%3E") no-repeat center;
}
.search-input input {
  padding-left: 30px;
}

/* === Tables ======================================================== */
.table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}
.table th {
  text-align: left;
  font-weight: 600;
  font-size: 11.5px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
  background: var(--bg-subtle);
  position: sticky;
  top: 0;
}
.table td {
  padding: 9px 12px;
  border-bottom: 1px solid var(--border);
  vertical-align: middle;
}
.table tbody tr { transition: background-color .1s ease; }
.table tbody tr:hover { background: var(--bg-subtle); }
.table tbody tr.selected { background: var(--bg-selected); }
.table td.num, .table th.num { text-align: right; font-variant-numeric: tabular-nums; font-family: var(--font-mono); font-size: 12.5px; }

/* === Badges ======================================================== */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 2px 8px;
  background: var(--bg-subtle);
  color: var(--text-muted);
  border-radius: 999px;
  font-size: 11px;
  font-weight: 500;
  line-height: 1.6;
  white-space: nowrap;
}
.badge.primary { background: var(--primary-soft); color: var(--primary); }
.badge.success { background: var(--success-soft); color: var(--success); }
.badge.warning { background: var(--warning-soft); color: var(--warning); }
.badge.danger { background: var(--danger-soft); color: var(--danger); }
.badge.accent { background: #e0f3f1; color: var(--accent); }
.badge.neutral { background: var(--bg-subtle); color: var(--text-muted); }
.badge.outlined { background: transparent; border: 1px solid var(--border-strong); }

.dot-badge {
  display: inline-block;
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--text-subtle);
}
.dot-badge.success { background: var(--success); }
.dot-badge.warning { background: var(--warning); }
.dot-badge.danger { background: var(--danger); }
.dot-badge.primary { background: var(--primary); }

/* Item status pill colours */
.status-unpriced { background: #efefef; color: #666; }
.status-plugged { background: #fff4e0; color: #c77700; }
.status-priced { background: #e6efff; color: #2b5bd7; }
.status-reviewed { background: #e2f1e6; color: #2e7d44; }
.status-locked { background: #e7e3f5; color: #5243aa; }

/* === Tabs ========================================================== */
.tabs {
  display: flex;
  gap: 2px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 16px;
}
.tab {
  padding: 9px 14px;
  font-size: 13px;
  color: var(--text-muted);
  cursor: pointer;
  border-bottom: 2px solid transparent;
  font-weight: 500;
  user-select: none;
}
.tab:hover { color: var(--text); }
.tab.active {
  color: var(--primary);
  border-bottom-color: var(--primary);
}

/* === Stepper ======================================================= */
.stepper {
  display: flex;
  gap: 0;
  background: var(--bg-raised);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  padding: 4px;
  margin-bottom: 20px;
  box-shadow: var(--shadow-sm);
}
.step {
  flex: 1;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border-radius: var(--r);
  cursor: pointer;
  font-size: 13px;
  color: var(--text-muted);
  position: relative;
}
.step:hover { background: var(--bg-subtle); }
.step.active {
  background: var(--primary-soft);
  color: var(--primary);
  font-weight: 600;
}
.step.complete { color: var(--success); }
.step-number {
  width: 22px; height: 22px;
  border-radius: 50%;
  background: var(--bg-subtle);
  color: var(--text-muted);
  font-size: 11.5px;
  font-weight: 600;
  display: inline-flex;
  align-items: center; justify-content: center;
  flex-shrink: 0;
}
.step.active .step-number { background: var(--primary); color: #fff; }
.step.complete .step-number { background: var(--success); color: #fff; }

/* === Misc utilities ================================================ */
.hstack { display: flex; align-items: center; gap: 8px; }
.vstack { display: flex; flex-direction: column; gap: 8px; }
.stack-md { gap: 12px; }
.stack-lg { gap: 16px; }
.grow { flex: 1; }
.mono { font-family: var(--font-mono); font-size: 0.92em; }
.num { font-variant-numeric: tabular-nums; font-family: var(--font-mono); }
.muted { color: var(--text-muted); }
.subtle { color: var(--text-subtle); }
.right { text-align: right; }
.center { text-align: center; }
.hidden { display: none !important; }
.divider { height: 1px; background: var(--border); margin: 12px 0; }
.spacer { flex: 1; }

.kbd {
  font-family: var(--font-mono);
  font-size: 11px;
  padding: 1px 5px;
  background: var(--bg-subtle);
  border: 1px solid var(--border);
  border-bottom-width: 2px;
  border-radius: 3px;
  color: var(--text-muted);
}

/* Split panes */
.split {
  display: grid;
  gap: 16px;
}
.split.two { grid-template-columns: 1fr 1fr; }
.split.three { grid-template-columns: 1fr 1fr 1fr; }
.split.sidebar-left { grid-template-columns: 280px 1fr; }
.split.sidebar-right { grid-template-columns: 1fr 320px; }
.split.tree-main-side { grid-template-columns: 340px 1fr 320px; }
.split.tree-main { grid-template-columns: 320px 1fr; }

/* KPI tiles */
.kpi {
  background: var(--bg-raised);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  padding: 14px 16px;
  box-shadow: var(--shadow-sm);
}
.kpi .label {
  font-size: 11.5px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-muted);
  margin-bottom: 6px;
}
.kpi .value {
  font-size: 22px;
  font-weight: 600;
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
}
.kpi .delta { font-size: 12px; color: var(--text-muted); margin-top: 2px; }
.kpi .delta.up { color: var(--success); }
.kpi .delta.down { color: var(--danger); }

/* Tree */
.tree {
  font-size: 13px;
  user-select: none;
}
.tree-node {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 5px 8px 5px 8px;
  border-radius: var(--r-sm);
  cursor: pointer;
  white-space: nowrap;
}
.tree-node:hover { background: var(--bg-hover); }
.tree-node.selected { background: var(--bg-selected); color: var(--primary); font-weight: 500; }
.tree-node .caret {
  width: 14px;
  display: inline-flex;
  justify-content: center;
  color: var(--text-muted);
  font-size: 10px;
}
.tree-children { margin-left: 14px; border-left: 1px dashed var(--border); padding-left: 4px; }

/* Resource/recipe row */
.row-card {
  display: grid;
  grid-template-columns: 1fr auto auto auto;
  gap: 10px;
  align-items: center;
  padding: 8px 12px;
  background: var(--bg-raised);
  border: 1px solid var(--border);
  border-radius: var(--r);
}
.row-card + .row-card { margin-top: 6px; }
.row-card .desc { font-weight: 500; }
.row-card .meta { color: var(--text-muted); font-size: 12px; }

/* Notifications / banners */
.banner {
  padding: 10px 14px;
  border-radius: var(--r);
  border: 1px solid;
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 13px;
  margin-bottom: 14px;
}
.banner.info    { background: var(--primary-soft); border-color: #b5c8f2; color: #1f47b0; }
.banner.warning { background: var(--warning-soft); border-color: #f2d58a; color: #8a5200; }
.banner.danger  { background: var(--danger-soft); border-color: #f2bcb5; color: #8a2a1c; }
.banner.success { background: var(--success-soft); border-color: #b5d9bf; color: #225f36; }

/* Drawers / modal overlays (visual only, non-functional in prototypes) */
.drawer {
  background: var(--bg-raised);
  border-left: 1px solid var(--border);
  box-shadow: var(--shadow-lg);
  padding: 16px;
}

/* Segmented control */
.segmented {
  display: inline-flex;
  border: 1px solid var(--border-strong);
  border-radius: var(--r);
  overflow: hidden;
  background: var(--bg-raised);
}
.segmented button {
  border: 0;
  background: transparent;
  font-family: inherit;
  font-size: 12.5px;
  padding: 5px 12px;
  cursor: pointer;
  color: var(--text-muted);
}
.segmented button + button { border-left: 1px solid var(--border); }
.segmented button.active { background: var(--primary-soft); color: var(--primary); font-weight: 600; }
.segmented button:hover:not(.active) { background: var(--bg-hover); color: var(--text); }

/* Chips */
.chip {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 2px 8px;
  border: 1px solid var(--border);
  background: var(--bg-subtle);
  border-radius: 999px;
  font-size: 11.5px;
  color: var(--text-muted);
}

/* Collapsible section */
details.section {
  background: var(--bg-raised);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  margin-bottom: 10px;
  overflow: hidden;
}
details.section > summary {
  cursor: pointer;
  padding: 10px 14px;
  font-weight: 600;
  background: var(--bg-subtle);
  list-style: none;
  display: flex;
  align-items: center;
  gap: 8px;
}
details.section > summary::before {
  content: '▸';
  font-size: 10px;
  color: var(--text-muted);
  transition: transform .12s ease;
}
details.section[open] > summary::before { transform: rotate(90deg); }
details.section[open] > summary { border-bottom: 1px solid var(--border); }
details.section > *:not(summary) { padding: 12px 14px; }

/* Icon only buttons */
.icon-btn {
  width: 28px; height: 28px;
  display: inline-flex;
  align-items: center; justify-content: center;
  border-radius: var(--r);
  border: 1px solid transparent;
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
}
.icon-btn:hover { background: var(--bg-hover); color: var(--text); }

/* Prototype ribbon (visual marker so viewers know it's not real) */
.proto-ribbon {
  position: fixed;
  bottom: 10px;
  right: 12px;
  background: rgba(28, 34, 48, 0.92);
  color: #fff;
  padding: 4px 10px;
  border-radius: 999px;
  font-size: 11px;
  letter-spacing: 0.03em;
  z-index: 1000;
  backdrop-filter: blur(4px);
}