:root {
  --primary: #1e3a5f;
  --primary-light: #2d4f7f;
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --success: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;
  --info: #6366f1;
  --bg: #f1f5f9;
  --surface: #ffffff;
  --border: #e2e8f0;
  --text: #1e293b;
  --text-muted: #64748b;
  --sidebar-w: 220px;
  --panel-w: 480px;
  --radius: 8px;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 14px;
  color: var(--text);
  background: var(--bg);
  line-height: 1.5;
}

/* ─── Layout ──────────────────────────────────────────────────────────────── */

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

.main {
  flex: 1;
  margin-left: var(--sidebar-w);
  min-height: 100vh;
  background: var(--bg);
}

.view-content {
  padding: 32px;
  max-width: 1100px;
}

/* ─── Sidebar ─────────────────────────────────────────────────────────────── */

.sidebar {
  width: var(--sidebar-w);
  background: var(--primary);
  position: fixed;
  top: 0;
  left: 0;
  height: 100vh;
  display: flex;
  flex-direction: column;
  z-index: 100;
}

.sidebar-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 20px 16px;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}

.logo-title {
  color: #fff;
  font-weight: 700;
  font-size: 13px;
  line-height: 1.2;
}

.logo-sub {
  color: rgba(255,255,255,0.5);
  font-size: 11px;
}

.sidebar-nav {
  flex: 1;
  padding: 12px 8px;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 10px;
  color: rgba(255,255,255,0.65);
  text-decoration: none;
  border-radius: 6px;
  font-size: 13.5px;
  transition: background 0.15s, color 0.15s;
}

.nav-item:hover {
  background: rgba(255,255,255,0.08);
  color: #fff;
}

.nav-item.active {
  background: rgba(37,99,235,0.5);
  color: #fff;
}

.sidebar-footer {
  padding: 16px;
  border-top: 1px solid rgba(255,255,255,0.1);
}

.org-name {
  color: rgba(255,255,255,0.85);
  font-size: 12px;
  font-weight: 600;
}

.org-sub {
  color: rgba(255,255,255,0.4);
  font-size: 11px;
  margin-top: 2px;
}

/* ─── Page header ─────────────────────────────────────────────────────────── */

.page-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
}

.page-title {
  font-size: 22px;
  font-weight: 700;
  color: var(--text);
}

.page-subtitle {
  color: var(--text-muted);
  font-size: 13px;
  margin-top: 2px;
}

/* ─── KPI Cards ───────────────────────────────────────────────────────────── */

.kpi-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-bottom: 28px;
}

.kpi-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
}

.kpi-label {
  font-size: 12px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 600;
  margin-bottom: 8px;
}

.kpi-value {
  font-size: 26px;
  font-weight: 700;
  color: var(--text);
  line-height: 1;
}

.kpi-value.positive { color: var(--success); }
.kpi-value.negative { color: var(--danger); }
.kpi-value.warning  { color: var(--warning); }

.kpi-sub {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 6px;
}

/* ─── Card / Surface ──────────────────────────────────────────────────────── */

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

.card-header {
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.card-title {
  font-weight: 600;
  font-size: 14px;
}

/* ─── Buttons ─────────────────────────────────────────────────────────────── */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  border-radius: 6px;
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  border: none;
  transition: background 0.15s, opacity 0.15s;
  text-decoration: none;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
}

.btn-primary:hover { background: var(--accent-hover); }

.btn-secondary {
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border);
}

.btn-secondary:hover { background: #e2e8f0; }

.btn-danger {
  background: #fef2f2;
  color: var(--danger);
  border: 1px solid #fecaca;
}

.btn-danger:hover { background: #fee2e2; }

.btn-success {
  background: #ecfdf5;
  color: var(--success);
  border: 1px solid #a7f3d0;
}

.btn-success:hover { background: #d1fae5; }

.btn-sm {
  padding: 5px 10px;
  font-size: 12px;
}

.btn-icon {
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
  color: var(--text-muted);
  border-radius: 4px;
  display: inline-flex;
  align-items: center;
}

.btn-icon:hover { background: var(--bg); color: var(--text); }

/* ─── Tables ──────────────────────────────────────────────────────────────── */

.table-wrap { overflow-x: auto; }

table {
  width: 100%;
  border-collapse: collapse;
}

th {
  text-align: left;
  padding: 10px 16px;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
  background: #fafafa;
}

td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
  vertical-align: middle;
}

tr:last-child td { border-bottom: none; }
tr:hover td { background: #fafafa; }

.td-actions {
  display: flex;
  gap: 4px;
  justify-content: flex-end;
}

.empty-state {
  text-align: center;
  padding: 48px 20px;
  color: var(--text-muted);
}

.empty-state svg { opacity: 0.3; margin-bottom: 12px; }
.empty-state p { font-size: 14px; }

/* ─── Status Badges ───────────────────────────────────────────────────────── */

.badge {
  display: inline-block;
  padding: 3px 9px;
  border-radius: 99px;
  font-size: 11px;
  font-weight: 600;
  text-transform: capitalize;
}

.badge-draft    { background: #f1f5f9; color: #475569; }
.badge-sent     { background: #dbeafe; color: #1d4ed8; }
.badge-paid     { background: #dcfce7; color: #15803d; }
.badge-overdue  { background: #fee2e2; color: #b91c1c; }
.badge-cancelled{ background: #f1f5f9; color: #94a3b8; }
.badge-open     { background: #fef3c7; color: #b45309; }

/* ─── Filter tabs ─────────────────────────────────────────────────────────── */

.filter-tabs {
  display: flex;
  gap: 4px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 3px;
}

.filter-tab {
  padding: 5px 14px;
  border-radius: 4px;
  font-size: 12px;
  font-weight: 500;
  cursor: pointer;
  color: var(--text-muted);
  border: none;
  background: none;
  transition: background 0.15s, color 0.15s;
}

.filter-tab.active {
  background: var(--surface);
  color: var(--text);
  box-shadow: 0 1px 3px rgba(0,0,0,0.08);
}

/* ─── Forms ───────────────────────────────────────────────────────────────── */

.form-group {
  margin-bottom: 16px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

label {
  display: block;
  font-size: 12px;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 5px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

input[type="text"],
input[type="email"],
input[type="number"],
input[type="date"],
select,
textarea {
  width: 100%;
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 13px;
  color: var(--text);
  background: var(--surface);
  transition: border-color 0.15s;
  font-family: inherit;
}

input:focus, select:focus, textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(37,99,235,0.08);
}

textarea { resize: vertical; min-height: 80px; }

.checkbox-row {
  display: flex;
  align-items: center;
  gap: 8px;
}

.checkbox-row input[type="checkbox"] {
  width: 16px;
  height: 16px;
  cursor: pointer;
}

.checkbox-row label {
  margin: 0;
  text-transform: none;
  font-size: 13px;
  font-weight: 400;
  color: var(--text);
  cursor: pointer;
}

.form-actions {
  display: flex;
  gap: 8px;
  padding-top: 8px;
  border-top: 1px solid var(--border);
  margin-top: 20px;
}

/* ─── Line items table (invoice form) ─────────────────────────────────────── */

.line-items-table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 8px;
}

.line-items-table th {
  background: none;
  padding: 6px 8px;
  font-size: 11px;
}

.line-items-table td {
  padding: 4px 4px;
  border-bottom: none;
}

.line-items-table td input {
  padding: 6px 8px;
  font-size: 13px;
}

.line-items-table .line-total {
  min-width: 80px;
  font-weight: 600;
  text-align: right;
  padding-right: 8px;
}

.invoice-totals {
  margin-left: auto;
  width: 220px;
  margin-top: 8px;
}

.totals-row {
  display: flex;
  justify-content: space-between;
  padding: 4px 0;
  font-size: 13px;
}

.totals-row.total-final {
  font-weight: 700;
  font-size: 15px;
  border-top: 1px solid var(--border);
  margin-top: 4px;
  padding-top: 8px;
}

/* ─── Panel (slide-in) ────────────────────────────────────────────────────── */

.panel-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.35);
  z-index: 200;
}

.panel {
  position: fixed;
  top: 0;
  right: 0;
  width: var(--panel-w);
  height: 100vh;
  background: var(--surface);
  z-index: 201;
  display: flex;
  flex-direction: column;
  box-shadow: -4px 0 24px rgba(0,0,0,0.12);
  transform: translateX(0);
  transition: transform 0.25s ease;
}

.panel.hidden {
  transform: translateX(100%);
}

.panel-overlay.hidden { display: none; }

.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.panel-header h3 {
  font-size: 16px;
  font-weight: 700;
}

.panel-body {
  flex: 1;
  overflow-y: auto;
  padding: 24px;
}

/* ─── Reports ─────────────────────────────────────────────────────────────── */

.report-controls {
  display: flex;
  gap: 12px;
  align-items: center;
  margin-bottom: 24px;
}

.report-controls select {
  width: auto;
}

.report-section {
  margin-bottom: 32px;
}

.report-section-title {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 12px;
}

.summary-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-bottom: 20px;
}

.summary-item {
  background: var(--bg);
  border-radius: 6px;
  padding: 14px 16px;
}

.summary-item .label { font-size: 11px; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.05em; margin-bottom: 4px; }
.summary-item .value { font-size: 20px; font-weight: 700; }
.summary-item .value.positive { color: var(--success); }
.summary-item .value.negative { color: var(--danger); }

/* ─── Toast ───────────────────────────────────────────────────────────────── */

.toast {
  position: fixed;
  bottom: 24px;
  right: 24px;
  background: var(--text);
  color: #fff;
  padding: 12px 20px;
  border-radius: 8px;
  font-size: 13px;
  font-weight: 500;
  z-index: 999;
  box-shadow: 0 4px 16px rgba(0,0,0,0.2);
  transition: opacity 0.3s;
}

.toast.hidden { opacity: 0; pointer-events: none; }
.toast.success { background: var(--success); }
.toast.error   { background: var(--danger); }

/* ─── Misc ────────────────────────────────────────────────────────────────── */

.text-right { text-align: right; }
.text-muted { color: var(--text-muted); }
.font-mono  { font-family: "SF Mono", "Fira Code", monospace; font-size: 12px; }
.fw-600     { font-weight: 600; }
.mt-16      { margin-top: 16px; }