:root {
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --primary-light: #eff6ff;
  --success: #16a34a;
  --success-light: #f0fdf4;
  --danger: #dc2626;
  --danger-light: #fef2f2;
  --warning: #d97706;
  --warning-light: #fffbeb;
  --text: #1e293b;
  --text-muted: #64748b;
  --border: #e2e8f0;
  --bg: #f8fafc;
  --sidebar-w: 240px;
  --card-shadow: 0 1px 3px rgba(0,0,0,.1), 0 1px 2px rgba(0,0,0,.06);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: 'Segoe UI', system-ui, sans-serif; background: var(--bg); color: var(--text); font-size: 14px; }

/* ---- Layout ---- */
.app-layout { display: flex; height: 100vh; overflow: hidden; }

.sidebar {
  width: var(--sidebar-w);
  background: #1e293b;
  color: #e2e8f0;
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  transition: width .25s;
  overflow: hidden;
}
.sidebar.collapsed { width: 56px; }
.sidebar-brand {
  padding: 20px 16px;
  font-size: 16px;
  font-weight: 700;
  color: #fff;
  display: flex;
  align-items: center;
  gap: 10px;
  border-bottom: 1px solid #334155;
}
.sidebar-brand i { font-size: 20px; color: #60a5fa; flex-shrink: 0; }
.sidebar-nav { flex: 1; overflow-y: auto; padding: 8px 0; }
.nav-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 11px 16px;
  color: #94a3b8;
  text-decoration: none;
  transition: background .15s, color .15s;
  white-space: nowrap;
}
.nav-item:hover, .nav-item.active {
  background: #2563eb;
  color: #fff;
}
.nav-item i { width: 20px; text-align: center; flex-shrink: 0; }
.nav-group { margin-bottom: 4px; }
.nav-group-title { cursor: pointer; }
.nav-subitem {
  display: none;
  padding: 6px 28px 6px 44px;
  font-size: 13px;
  color: #cbd5f5;
  text-decoration: none;
}
.nav-group.open .nav-subitem {
  display: block;
}
.nav-subitem:hover {
  background: #111827;
  color: #fff;
}
.nav-subitem.active {
  background: #2563eb;
  color: #fff;
}
.sidebar-footer {
  padding: 12px 16px;
  border-top: 1px solid #334155;
}
.user-info { display: flex; align-items: center; gap: 8px; margin-bottom: 8px; font-size: 13px; color: #94a3b8; }
.btn-logout {
  width: 100%;
  background: #dc2626;
  color: #fff;
  border: none;
  padding: 8px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 13px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
}
.btn-logout:hover { background: #b91c1c; }

.main-content { flex: 1; display: flex; flex-direction: column; overflow: hidden; }
.topbar {
  background: #fff;
  border-bottom: 1px solid var(--border);
  padding: 12px 20px;
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}
.btn-menu { background: none; border: none; font-size: 18px; cursor: pointer; color: var(--text-muted); padding: 4px; }
.page-title { font-size: 18px; font-weight: 600; flex: 1; }
.datetime { color: var(--text-muted); font-size: 13px; }

.content-area { flex: 1; overflow-y: auto; padding: 20px; }

/* ---- Cards ---- */
.card {
  background: #fff;
  border-radius: 8px;
  padding: 20px;
  box-shadow: var(--card-shadow);
  border: 1px solid var(--border);
}
.card-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 16px; }
.card-title { font-size: 16px; font-weight: 600; }

/* ---- Stat Cards ---- */
.stats-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 16px; margin-bottom: 20px; }
.stat-card {
  background: #fff;
  border-radius: 8px;
  padding: 16px 20px;
  box-shadow: var(--card-shadow);
  border-left: 4px solid var(--primary);
  border: 1px solid var(--border);
  border-left: 4px solid var(--primary);
}
.stat-card.green { border-left-color: var(--success); }
.stat-card.red { border-left-color: var(--danger); }
.stat-card.orange { border-left-color: var(--warning); }
.stat-label { font-size: 12px; color: var(--text-muted); text-transform: uppercase; letter-spacing: .5px; margin-bottom: 6px; }
.stat-value { font-size: 26px; font-weight: 700; }
.stat-sub { font-size: 12px; color: var(--text-muted); margin-top: 4px; }

/* ---- Buttons ---- */
.btn {
  padding: 8px 16px;
  border: none;
  border-radius: 6px;
  font-size: 14px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-weight: 500;
  transition: opacity .15s;
}
.btn:hover { opacity: .85; }
.btn-primary { background: var(--primary); color: #fff; }
.btn-success { background: var(--success); color: #fff; }
.btn-danger { background: var(--danger); color: #fff; }
.btn-warning { background: var(--warning); color: #fff; }
.btn-outline { background: #fff; color: var(--text); border: 1px solid var(--border); }
.btn-sm { padding: 4px 10px; font-size: 12px; }

/* ---- Forms ---- */
.form-group { margin-bottom: 14px; }
.form-label { display: block; font-size: 13px; font-weight: 500; margin-bottom: 4px; }
.form-control {
  width: 100%;
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 14px;
  color: var(--text);
  background: #fff;
  transition: border-color .15s;
}
.form-control:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px rgba(37,99,235,.1); }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.form-row-3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 12px; }

/* ---- Tables ---- */
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; }
th { background: #f1f5f9; color: var(--text-muted); font-size: 12px; text-transform: uppercase; letter-spacing: .5px; padding: 10px 12px; text-align: left; }
td { padding: 10px 12px; border-bottom: 1px solid var(--border); }
tr:hover td { background: #f8fafc; }
.badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 12px;
  font-size: 11px;
  font-weight: 600;
}
.badge-success { background: var(--success-light); color: var(--success); }
.badge-danger { background: var(--danger-light); color: var(--danger); }
.badge-warning { background: var(--warning-light); color: var(--warning); }
.badge-info { background: var(--primary-light); color: var(--primary); }

/* ---- Search bar ---- */
.search-bar { display: flex; gap: 8px; margin-bottom: 16px; }
.search-input { flex: 1; padding: 8px 12px; border: 1px solid var(--border); border-radius: 6px; font-size: 14px; }
.search-input:focus { outline: none; border-color: var(--primary); }

/* ---- Modal ---- */
.modal-overlay { position: fixed; inset: 0; background: rgba(0,0,0,.5); z-index: 1000; }
.modal-overlay.hidden { display: none; }
.modal {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: #fff;
  border-radius: 10px;
  z-index: 1001;
  width: 90%;
  max-width: 560px;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: 0 20px 60px rgba(0,0,0,.2);
}
.modal-header { padding: 18px 20px; border-bottom: 1px solid var(--border); display: flex; justify-content: space-between; align-items: center; }
.modal-title { font-size: 16px; font-weight: 600; }
.modal-close { background: none; border: none; font-size: 18px; cursor: pointer; color: var(--text-muted); }
.modal-body { padding: 20px; }
.modal-footer { padding: 14px 20px; border-top: 1px solid var(--border); display: flex; justify-content: flex-end; gap: 8px; }

/* ---- Toast ---- */
#toast-container { position: fixed; top: 20px; right: 20px; z-index: 2000; display: flex; flex-direction: column; gap: 8px; }
.toast {
  background: #1e293b;
  color: #fff;
  padding: 12px 18px;
  border-radius: 8px;
  font-size: 14px;
  box-shadow: 0 4px 12px rgba(0,0,0,.2);
  display: flex;
  align-items: center;
  gap: 10px;
  animation: slideIn .3s;
  min-width: 240px;
}
.toast.success { background: var(--success); }
.toast.error { background: var(--danger); }
.toast.warning { background: var(--warning); }
@keyframes slideIn { from { transform: translateX(100%); opacity: 0; } to { transform: translateX(0); opacity: 1; } }

/* ---- POS ---- */
.pos-layout { display: grid; grid-template-columns: 1fr 380px; gap: 16px; height: calc(100vh - 100px); }
.pos-left { display: flex; flex-direction: column; gap: 12px; }
.pos-right { display: flex; flex-direction: column; }
.cart-items { flex: 1; overflow-y: auto; }
.cart-item {
  display: grid;
  grid-template-columns: 1fr 80px 80px 60px;
  gap: 8px;
  align-items: center;
  padding: 8px 0;
  border-bottom: 1px solid var(--border);
}
.cart-totals { border-top: 2px solid var(--border); padding-top: 12px; }
.total-row { display: flex; justify-content: space-between; padding: 4px 0; }
.total-row.grand { font-size: 18px; font-weight: 700; color: var(--primary); }

/* ---- Search Dropdown ---- */
.search-dropdown {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 0 0 8px 8px;
  box-shadow: 0 8px 24px rgba(0,0,0,.1);
  z-index: 100;
  max-height: 300px;
  overflow-y: auto;
}
.search-result-item { padding: 10px 14px; cursor: pointer; display: flex; justify-content: space-between; align-items: center; }
.search-result-item:hover { background: var(--primary-light); }
.search-relative { position: relative; }

/* ---- Login ---- */
.login-page { min-height: 100vh; display: flex; align-items: center; justify-content: center; background: linear-gradient(135deg, #1e3a5f 0%, #2563eb 100%); }
.login-box { background: #fff; border-radius: 12px; padding: 40px; width: 380px; box-shadow: 0 20px 60px rgba(0,0,0,.2); }
.login-logo { text-align: center; margin-bottom: 28px; }
.login-logo i { font-size: 48px; color: var(--primary); }
.login-logo h1 { font-size: 22px; margin-top: 8px; }
.login-logo p { color: var(--text-muted); font-size: 13px; }

/* ---- Print ---- */
@media print {
  .sidebar, .topbar, .no-print { display: none !important; }
  .main-content { margin: 0; }
  .print-invoice { max-width: 300px; margin: 0 auto; font-family: monospace; }
}

/* ---- Pagination ---- */
.pagination { display: flex; gap: 4px; align-items: center; margin-top: 12px; }
.page-btn { padding: 6px 10px; border: 1px solid var(--border); background: #fff; border-radius: 4px; cursor: pointer; font-size: 13px; }
.page-btn.active { background: var(--primary); color: #fff; border-color: var(--primary); }

/* ---- Alert ---- */
.alert { padding: 12px 16px; border-radius: 6px; margin-bottom: 12px; font-size: 13px; }
.alert-danger { background: var(--danger-light); color: var(--danger); border: 1px solid #fca5a5; }
.alert-warning { background: var(--warning-light); color: var(--warning); border: 1px solid #fcd34d; }
.alert-success { background: var(--success-light); color: var(--success); border: 1px solid #86efac; }

/* ---- Responsive ---- */
@media (max-width: 768px) {
  .sidebar { position: fixed; z-index: 500; }
  .pos-layout { grid-template-columns: 1fr; }
  .form-row, .form-row-3 { grid-template-columns: 1fr; }
}