:root {
  --bg: #e9edf3;
  --card: #e9edf3;
  --text: #2b3440;
  --muted: #6f7a89;
  --line: #d4dce7;
  --primary: #5367d8;
  --secondary: #2f3a48;
  --danger: #dc2626;
  --success: #16a34a;
  --neu-light: #ffffff;
  --neu-dark: #c7d0de;
}
* { box-sizing: border-box; }
body { margin: 0; font-family: Arial, sans-serif; background: var(--bg); color: var(--text); }
.app-shell { display: grid; grid-template-columns: 240px 1fr; min-height: 100vh; }
.sidebar {
  background: var(--card);
  color: var(--text);
  padding: 24px;
  box-shadow: 10px 0 20px var(--neu-dark), -8px 0 18px var(--neu-light);
}
.brand-block { text-align: center; margin-bottom: 14px; }
.brand-block h2 { margin: 8px 0 4px; }
.brand-logo {
  width: 100%;
  max-width: 120px;
  height: 72px;
  object-fit: contain;
  object-position: center;
  display: block;
  margin: 0 auto;
}
.sidebar nav { display: grid; gap: 10px; }
.sidebar .nav-link {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--secondary);
  text-decoration: none;
  padding: 10px 12px;
  border-radius: 12px;
  background: var(--card);
  box-shadow: 5px 5px 10px var(--neu-dark), -5px -5px 10px var(--neu-light);
  transition: transform .12s ease, box-shadow .12s ease;
}
.sidebar .nav-link:hover {
  transform: translateY(-1px);
  box-shadow: 8px 8px 14px var(--neu-dark), -6px -6px 12px var(--neu-light);
}
.nav-icon {
  width: 22px;
  height: 22px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  color: var(--secondary);
  background: var(--card);
  box-shadow: inset 2px 2px 4px var(--neu-dark), inset -2px -2px 4px var(--neu-light);
}
.nav-icon::before {
  content: "";
  width: 10px;
  height: 10px;
  border: 2px solid currentColor;
  border-radius: 3px;
}
.nav-icon[data-icon="dashboard"]::before { border-radius: 50%; }
.nav-icon[data-icon="products"]::before { border-radius: 2px; }
.nav-icon[data-icon="sales"]::before { width: 3px; height: 10px; border-width: 0 2px 0 2px; border-radius: 1px; }
.nav-icon[data-icon="expenses"]::before { width: 10px; height: 2px; border-width: 2px 0 2px 0; border-radius: 1px; }
.nav-icon[data-icon="users"]::before { border-radius: 50%; box-shadow: 6px 0 0 -2px currentColor; }
.nav-icon[data-icon="brand"]::before { transform: rotate(45deg); border-radius: 2px; }
.nav-icon[data-icon="logout"]::before { width: 9px; height: 9px; border-radius: 0; border-width: 0 2px 2px 0; transform: rotate(-45deg); }
.nav-icon[data-icon="superuser"]::before { width: 10px; height: 10px; border-radius: 50%; box-shadow: inset 0 0 0 2px var(--card); background: currentColor; }
.content { padding: 24px; }
.card {
  background: var(--card);
  border: 1px solid transparent;
  border-radius: 16px;
  padding: 18px;
  margin-bottom: 20px;
  box-shadow: 10px 10px 22px var(--neu-dark), -10px -10px 22px var(--neu-light);
}
.transparent-theme {
  background: var(--card);
  box-shadow: inset 4px 4px 8px var(--neu-dark), inset -4px -4px 8px var(--neu-light);
}
.grid { display:grid; gap:16px; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
input, select, textarea, button {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid transparent;
  border-radius: 12px;
  margin-top: 6px;
  background: var(--card);
  box-shadow: inset 3px 3px 6px var(--neu-dark), inset -3px -3px 6px var(--neu-light);
  transition: all .18s ease;
}
input:focus, select:focus, textarea:focus {
  outline: none;
  box-shadow: inset 2px 2px 5px var(--neu-dark), inset -2px -2px 5px var(--neu-light), 0 0 0 2px rgba(83, 103, 216, .18);
}
button, .btn {
  background: var(--card);
  color: var(--secondary);
  border: none;
  cursor: pointer;
  text-decoration: none;
  display: inline-block;
  width: auto;
  border-radius: 12px;
  box-shadow: 6px 6px 10px var(--neu-dark), -6px -6px 10px var(--neu-light);
  transition: transform .12s ease, box-shadow .12s ease;
}
button:hover, .btn:hover { transform: translateY(-1px); }
button:active, .btn:active {
  transform: translateY(1px) scale(.99);
  box-shadow: inset 4px 4px 8px var(--neu-dark), inset -4px -4px 8px var(--neu-light);
}
.btn-danger { background: var(--danger); }
table {
  width:100%;
  border-collapse: collapse;
  background: var(--card);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: inset 3px 3px 6px var(--neu-dark), inset -3px -3px 6px var(--neu-light);
}
th, td { padding:12px; border-bottom:1px solid var(--line); text-align:left; }
tr:hover td { background: rgba(148, 163, 184, .10); }
.alert { padding: 12px 14px; border-radius: 8px; margin-bottom: 16px; }
.success { background:#ecfdf5; color:#166534; }
.error { background:#fef2f2; color:#991b1b; }
.stats { display:grid; grid-template-columns: repeat(4,1fr); gap:16px; }
.stat {
  background:var(--card);
  border:1px solid transparent;
  border-radius:14px;
  padding:16px;
  box-shadow: 8px 8px 16px var(--neu-dark), -8px -8px 16px var(--neu-light);
}
.stat strong { display:block; margin-bottom: 6px; }
.stat div { font-size: 1.35rem; font-weight: 700; color: var(--secondary); }
.hover-lift { transition: transform .2s ease, box-shadow .2s ease; }
.hover-lift:hover { transform: translateY(-3px); box-shadow: 0 10px 24px rgba(15,23,42,.12); }
.muted { color: var(--muted); }
.auth-wrap { max-width: 900px; margin: 40px auto; }
.receipt { max-width: 390px; margin: 0 auto; background: rgba(255,255,255,.96); padding:20px; border:1px solid var(--line); border-radius: 16px; font-family: "Courier New", Courier, monospace; overflow-wrap: anywhere; }
.receipt-header { display:flex; align-items:center; gap:12px; border-bottom: 2px solid var(--receipt-brand, var(--primary)); padding-bottom:10px; margin-bottom: 8px; }
.receipt-logo {
  width: 62px;
  height: 44px;
  object-fit: contain;
  object-position: center;
  border-radius: 8px;
  border: 1px solid var(--receipt-secondary, var(--secondary));
  background: #fff;
  padding: 2px;
}
.receipt-qr { text-align:center; padding:8px 0; }
.receipt-qr img { border:1px solid var(--line); border-radius:10px; padding:4px; background:white; }
.receipt-actions button { margin-right: 8px; }
.receipt-image-preview img { width: 100%; max-width: 420px; border: 1px solid var(--line); border-radius: 10px; background: #fff; }
.mobile-bottom-nav { display: none; }
@media print {
  @page { margin: 8mm; }
  .no-print { display:none !important; }
  body { background:white; margin: 0; padding: 0; }
  .receipt {
    width: 80mm;
    max-width: 100%;
    margin: 0 auto;
    border: 0;
    border-radius: 0;
    box-shadow: none;
    padding: 4mm 2mm;
  }
  .receipt-logo { width: 56px; height: 40px; object-fit: contain; }
  .receipt-qr img { width: 120px; height: 120px; }
}
@media (max-width: 900px) {
  .app-shell { grid-template-columns: 1fr; }
  body { background: var(--bg); }
  .sidebar {
    position: sticky;
    top: 0;
    z-index: 20;
    padding: 12px 16px;
    border-bottom-left-radius: 16px;
    border-bottom-right-radius: 16px;
    box-shadow: 6px 6px 14px var(--neu-dark), -6px -6px 14px var(--neu-light);
  }
  .sidebar h2 { margin: 0; font-size: 1rem; letter-spacing: .2px; }
  .brand-logo { max-width: 92px; height: 56px; }
  .sidebar nav { display: none; }
  .content {
    padding: 12px 12px calc(88px + env(safe-area-inset-bottom));
    max-width: 640px;
    margin: 0 auto;
    width: 100%;
  }
  .card { border-radius: 14px; padding: 14px; }
  .stats { grid-template-columns: repeat(2, 1fr); gap: 10px; }
  .grid-2, .grid-3 { grid-template-columns: 1fr; }
  .mobile-bottom-nav {
    display: grid;
    grid-template-columns: repeat(6, minmax(0, 1fr));
    gap: 4px;
    position: fixed;
    left: 8px;
    right: 8px;
    bottom: calc(8px + env(safe-area-inset-bottom));
    z-index: 40;
    padding: 8px;
    border-radius: 16px;
    background: var(--card);
    box-shadow: 8px 8px 16px var(--neu-dark), -8px -8px 16px var(--neu-light);
  }
  .mobile-bottom-nav .nav-link {
    color: var(--secondary);
    text-decoration: none;
    font-size: .72rem;
    text-align: center;
    padding: 8px 4px;
    border-radius: 10px;
    line-height: 1.15;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 3px;
    background: var(--card);
    box-shadow: 4px 4px 8px var(--neu-dark), -4px -4px 8px var(--neu-light);
  }
  .mobile-bottom-nav .nav-link:active,
  .mobile-bottom-nav .nav-link:hover {
    box-shadow: inset 3px 3px 6px var(--neu-dark), inset -3px -3px 6px var(--neu-light);
    color: var(--secondary);
  }
  .mobile-bottom-nav .nav-icon { width: 18px; height: 18px; font-size: 11px; }
  table, thead, tbody, th, td, tr { display: block; }
  tr { margin-bottom: 10px; border:1px solid var(--line); border-radius: 10px; overflow: hidden; }
  th { display:none; }
  td { border-bottom:1px solid var(--line); }
  td:last-child { border-bottom:none; }
}