/* ============================================================
   SMART-STOCK Design System
   Aesthetic: Clean Corporate Minimalism with sharp accents
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=DM+Sans:ital,opsz,wght@0,9..40,300;0,9..40,400;0,9..40,500;0,9..40,600;0,9..40,700;1,9..40,400&family=Space+Mono:wght@400;700&display=swap');

/* ── Variables ─────────────────────────────────────────────── */
:root {
  --bg:          #F7F6F2;
  --surface:     #FFFFFF;
  --surface2:    #F0EFE9;
  --border:      #E2E0D8;
  --accent:      #1A3A2A;       /* Deep forest green */
  --accent2:     #2D6A4F;
  --accent-lt:   #D8EDDF;
  --danger:      #C0392B;
  --danger-lt:   #FDECEA;
  --warn:        #D4880E;
  --warn-lt:     #FEF3DA;
  --success:     #1E8449;
  --success-lt:  #D5F5E3;
  --text-h:      #111111;
  --text-b:      #333333;
  --text-m:      #666666;
  --text-l:      #999999;
  --shadow:      0 1px 3px rgba(0,0,0,.06), 0 4px 16px rgba(0,0,0,.07);
  --shadow-lg:   0 8px 32px rgba(0,0,0,.12);
  --radius:      10px;
  --radius-lg:   16px;
  --font-body:   'DM Sans', sans-serif;
  --font-mono:   'Space Mono', monospace;
  --transition:  0.18s ease;
}

/* ── Reset & Base ──────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body { font-family: var(--font-body); background: var(--bg); color: var(--text-b); line-height: 1.6; }
img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { cursor: pointer; font-family: inherit; border: none; background: none; }
input, select, textarea { font-family: inherit; }

/* ── Scrollbar ─────────────────────────────────────────────── */
::-webkit-scrollbar { width: 5px; height: 5px; }
::-webkit-scrollbar-track { background: var(--surface2); }
::-webkit-scrollbar-thumb { background: #CCC; border-radius: 99px; }

/* ── Typography ────────────────────────────────────────────── */
h1,h2,h3,h4,h5 { font-weight: 600; color: var(--text-h); line-height: 1.25; }
.mono { font-family: var(--font-mono); }

/* ── Layout Helpers ────────────────────────────────────────── */
.container     { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.container-sm  { max-width: 780px;  margin: 0 auto; padding: 0 24px; }
.flex          { display: flex; }
.flex-center   { display: flex; align-items: center; justify-content: center; }
.flex-between  { display: flex; align-items: center; justify-content: space-between; }
.grid-2        { display: grid; grid-template-columns: repeat(2,1fr); gap: 24px; }
.grid-3        { display: grid; grid-template-columns: repeat(3,1fr); gap: 24px; }
.grid-4        { display: grid; grid-template-columns: repeat(4,1fr); gap: 20px; }

/* ── Cards ─────────────────────────────────────────────────── */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  padding: 28px;
}
.card-sm { padding: 18px; }

/* ── Buttons ───────────────────────────────────────────────── */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 10px 22px; border-radius: 8px;
  font-weight: 500; font-size: 0.9rem;
  transition: var(--transition); border: 1.5px solid transparent;
}
.btn-primary {
  background: var(--accent); color: #fff; border-color: var(--accent);
}
.btn-primary:hover { background: var(--accent2); border-color: var(--accent2); transform: translateY(-1px); box-shadow: 0 4px 12px rgba(26,58,42,.25); }

.btn-outline {
  background: transparent; color: var(--accent); border-color: var(--accent);
}
.btn-outline:hover { background: var(--accent); color: #fff; }

.btn-danger { background: var(--danger); color: #fff; border-color: var(--danger); }
.btn-danger:hover { background: #a93226; }

.btn-ghost { background: var(--surface2); color: var(--text-b); border-color: var(--border); }
.btn-ghost:hover { background: var(--border); }

.btn-lg { padding: 14px 32px; font-size: 1rem; border-radius: var(--radius); }
.btn-xl { padding: 18px 40px; font-size: 1.1rem; border-radius: var(--radius); }

.btn-icon {
  width: 40px; height: 40px; padding: 0; border-radius: 8px;
  display: inline-flex; align-items: center; justify-content: center;
}

/* ── Form Elements ─────────────────────────────────────────── */
.form-group { display: flex; flex-direction: column; gap: 6px; }
.form-label { font-size: 0.85rem; font-weight: 500; color: var(--text-m); }
.form-input {
  padding: 10px 14px; border: 1.5px solid var(--border);
  border-radius: 8px; font-size: 0.95rem; background: var(--surface);
  transition: border-color var(--transition);
  outline: none; width: 100%;
}
.form-input:focus { border-color: var(--accent); }
.form-input.error { border-color: var(--danger); }
select.form-input { appearance: none; background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%23666' stroke-width='1.5' fill='none' stroke-linecap='round'/%3E%3C/svg%3E"); background-repeat: no-repeat; background-position: right 14px center; padding-right: 36px; }

/* ── Badge / Tags ──────────────────────────────────────────── */
.badge {
  display: inline-flex; align-items: center;
  padding: 3px 10px; border-radius: 99px;
  font-size: 0.75rem; font-weight: 600;
}
.badge-green  { background: var(--success-lt); color: var(--success); }
.badge-red    { background: var(--danger-lt);  color: var(--danger); }
.badge-yellow { background: var(--warn-lt);    color: var(--warn); }
.badge-gray   { background: var(--surface2);   color: var(--text-m); }
.badge-accent { background: var(--accent-lt);  color: var(--accent); }

/* ── Tables ────────────────────────────────────────────────── */
.table-wrap { overflow-x: auto; border-radius: var(--radius); border: 1px solid var(--border); }
table { width: 100%; border-collapse: collapse; }
th { background: var(--surface2); padding: 12px 16px; text-align: left; font-size: 0.8rem; font-weight: 600; text-transform: uppercase; letter-spacing: .05em; color: var(--text-m); border-bottom: 1px solid var(--border); }
td { padding: 12px 16px; border-bottom: 1px solid var(--border); font-size: 0.9rem; }
tr:last-child td { border-bottom: none; }
tr:hover td { background: var(--surface2); }

/* ── Stat Cards ────────────────────────────────────────────── */
.stat-card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 20px 24px;
  box-shadow: var(--shadow);
}
.stat-label { font-size: 0.8rem; font-weight: 600; text-transform: uppercase; letter-spacing: .06em; color: var(--text-l); margin-bottom: 6px; }
.stat-value { font-size: 1.85rem; font-weight: 700; color: var(--text-h); line-height: 1; }
.stat-sub   { font-size: 0.8rem; color: var(--text-m); margin-top: 4px; }

/* ── Alerts / Toasts ───────────────────────────────────────── */
.alert {
  padding: 12px 16px; border-radius: 8px; font-size: 0.9rem;
  display: flex; align-items: center; gap: 10px;
}
.alert-success { background: var(--success-lt); color: var(--success); border: 1px solid #A9DFBF; }
.alert-danger  { background: var(--danger-lt);  color: var(--danger);  border: 1px solid #F5C6CB; }
.alert-warn    { background: var(--warn-lt);    color: var(--warn);    border: 1px solid #F8D7A0; }
.alert-info    { background: var(--accent-lt);  color: var(--accent);  border: 1px solid #B7DEC8; }

.toast-container {
  position: fixed; top: 20px; right: 20px; z-index: 9999;
  display: flex; flex-direction: column; gap: 10px; max-width: 320px;
}
.toast {
  background: var(--text-h); color: #fff;
  padding: 12px 18px; border-radius: 10px;
  font-size: 0.88rem; box-shadow: var(--shadow-lg);
  animation: slideIn 0.25s ease; display: flex; align-items: center; gap: 10px;
}
.toast.success { background: var(--success); }
.toast.error   { background: var(--danger); }
.toast.warn    { background: var(--warn); }

@keyframes slideIn { from { transform: translateX(110%); opacity: 0; } to { transform: translateX(0); opacity: 1; } }
@keyframes fadeOut { from { opacity: 1; } to { opacity: 0; transform: translateX(110%); } }

/* ── Modal ─────────────────────────────────────────────────── */
.modal-overlay {
  position: fixed; inset: 0; background: rgba(0,0,0,.45);
  display: flex; align-items: center; justify-content: center;
  z-index: 1000; padding: 20px;
  animation: fadeIn .2s ease;
}
.modal {
  background: var(--surface); border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg); padding: 32px;
  width: 100%; max-width: 520px; max-height: 90vh; overflow-y: auto;
  animation: scaleIn .2s ease;
}
.modal-lg { max-width: 760px; }
.modal-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 24px; }
.modal-title  { font-size: 1.2rem; font-weight: 600; }

@keyframes fadeIn   { from { opacity: 0; } to { opacity: 1; } }
@keyframes scaleIn  { from { transform: scale(.95); opacity: 0; } to { transform: scale(1); opacity: 1; } }

/* ── Sidebar nav ───────────────────────────────────────────── */
.sidebar {
  width: 240px; min-height: 100vh; background: var(--accent);
  display: flex; flex-direction: column; position: fixed; left: 0; top: 0; z-index: 100;
}
.sidebar-logo {
  padding: 24px 20px; border-bottom: 1px solid rgba(255,255,255,.1);
}
.sidebar-logo .logo-text { color: #fff; font-size: 1.2rem; font-weight: 700; letter-spacing: -.02em; }
.sidebar-logo .logo-sub  { color: rgba(255,255,255,.5); font-size: 0.7rem; letter-spacing: .1em; text-transform: uppercase; margin-top: 2px; }
.sidebar-nav { flex: 1; padding: 16px 12px; display: flex; flex-direction: column; gap: 4px; }
.nav-item {
  display: flex; align-items: center; gap: 10px;
  padding: 10px 12px; border-radius: 8px; font-size: 0.9rem; font-weight: 500;
  color: rgba(255,255,255,.65); transition: var(--transition); cursor: pointer;
}
.nav-item:hover   { background: rgba(255,255,255,.1); color: #fff; }
.nav-item.active  { background: rgba(255,255,255,.18); color: #fff; }
.nav-item .icon   { font-size: 1.1rem; width: 22px; flex-shrink: 0; }
.sidebar-footer   { padding: 16px; border-top: 1px solid rgba(255,255,255,.1); }

/* ── Main content with sidebar ─────────────────────────────── */
.with-sidebar { margin-left: 240px; }
.page-header  { padding: 28px 32px 0; display: flex; align-items: flex-start; justify-content: space-between; }
.page-title   { font-size: 1.6rem; font-weight: 700; }
.page-sub     { color: var(--text-m); font-size: 0.9rem; margin-top: 4px; }
.page-body    { padding: 24px 32px; }

/* ── Cashier specific ──────────────────────────────────────── */
.product-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(130px, 1fr)); gap: 14px; }
.product-tile {
  background: var(--surface); border: 2px solid var(--border);
  border-radius: var(--radius-lg); padding: 14px 10px;
  display: flex; flex-direction: column; align-items: center; gap: 8px;
  cursor: pointer; transition: all var(--transition); text-align: center;
  user-select: none;
}
.product-tile:hover { border-color: var(--accent2); transform: translateY(-2px); box-shadow: var(--shadow); }
.product-tile:active { transform: scale(.97); }
.product-tile.selected { border-color: var(--accent); background: var(--accent-lt); }
.product-tile .tile-icon { font-size: 2.4rem; }
.product-tile .tile-name { font-size: 0.82rem; font-weight: 600; color: var(--text-h); line-height: 1.3; }
.product-tile .tile-price { font-size: 0.88rem; font-weight: 700; color: var(--accent); font-family: var(--font-mono); }
.product-tile .tile-stock { font-size: 0.72rem; color: var(--text-l); }

/* ── Bill panel ────────────────────────────────────────────── */
.bill-panel {
  width: 340px; min-width: 320px; background: var(--surface);
  border-left: 1px solid var(--border); height: 100vh;
  position: fixed; right: 0; top: 0; display: flex; flex-direction: column;
  box-shadow: -4px 0 20px rgba(0,0,0,.06);
}
.bill-header { padding: 20px; border-bottom: 1px solid var(--border); background: var(--surface2); }
.bill-items  { flex: 1; overflow-y: auto; padding: 16px; display: flex; flex-direction: column; gap: 10px; }
.bill-item {
  display: flex; align-items: center; gap: 10px;
  padding: 10px 12px; background: var(--surface2);
  border-radius: 8px; font-size: 0.88rem;
}
.bill-item .item-name { flex: 1; font-weight: 500; }
.bill-item .item-qty  { display: flex; align-items: center; gap: 6px; }
.bill-item .qty-btn   { width: 26px; height: 26px; border-radius: 6px; background: var(--surface); border: 1px solid var(--border); font-weight: 700; display: flex; align-items: center; justify-content: center; cursor: pointer; font-size: 1rem; transition: var(--transition); }
.bill-item .qty-btn:hover { background: var(--accent); color: #fff; border-color: var(--accent); }
.bill-item .item-total { font-weight: 600; font-family: var(--font-mono); font-size: 0.85rem; min-width: 60px; text-align: right; }
.bill-footer { padding: 16px; border-top: 1px solid var(--border); }
.bill-row    { display: flex; justify-content: space-between; align-items: center; padding: 4px 0; font-size: 0.88rem; }
.bill-row.total { font-size: 1.1rem; font-weight: 700; border-top: 1.5px solid var(--border); margin-top: 8px; padding-top: 10px; }

/* ── Page-specific ─────────────────────────────────────────── */
.empty-state { text-align: center; padding: 60px 20px; color: var(--text-l); }
.empty-icon  { font-size: 3rem; margin-bottom: 12px; }
.empty-text  { font-size: 1rem; font-weight: 500; }

/* ── Utility ────────────────────────────────────────────────── */
.gap-8  { gap: 8px; }
.gap-12 { gap: 12px; }
.gap-16 { gap: 16px; }
.gap-24 { gap: 24px; }
.mb-8   { margin-bottom: 8px; }
.mb-16  { margin-bottom: 16px; }
.mb-24  { margin-bottom: 24px; }
.mt-16  { margin-top: 16px; }
.mt-24  { margin-top: 24px; }
.text-right { text-align: right; }
.text-center { text-align: center; }
.text-muted  { color: var(--text-m); font-size: 0.88rem; }
.text-danger { color: var(--danger); }
.text-success{ color: var(--success); }
.text-sm     { font-size: 0.85rem; }
.fw-600      { font-weight: 600; }
.hidden      { display: none !important; }
.w-full      { width: 100%; }

/* ── Responsive ────────────────────────────────────────────── */
@media (max-width: 900px) {
  .sidebar { transform: translateX(-100%); transition: transform .3s; }
  .sidebar.open { transform: translateX(0); }
  .with-sidebar { margin-left: 0; }
  .bill-panel { width: 100%; position: relative; height: auto; }
  .grid-3 { grid-template-columns: 1fr 1fr; }
  .grid-4 { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 600px) {
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .page-body { padding: 16px; }
  .product-grid { grid-template-columns: repeat(auto-fill, minmax(110px, 1fr)); }
}

/* ── Loading Spinner ──────────────────────────────────────── */
.spinner {
  width: 22px; height: 22px; border: 2.5px solid rgba(255,255,255,.3);
  border-top-color: #fff; border-radius: 50%;
  animation: spin .6s linear infinite; display: inline-block;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ── Progress / Divider ────────────────────────────────────── */
.divider { height: 1px; background: var(--border); margin: 20px 0; }
hr { border: none; border-top: 1px solid var(--border); margin: 20px 0; }

/* ── Search bar ────────────────────────────────────────────── */
.search-bar {
  display: flex; align-items: center; gap: 10px;
  background: var(--surface); border: 1.5px solid var(--border);
  border-radius: 8px; padding: 8px 14px; width: 280px;
}
.search-bar input { border: none; outline: none; background: none; flex: 1; font-size: 0.9rem; }
.search-bar .search-icon { color: var(--text-l); font-size: 1rem; }

/* ── Page transitions ──────────────────────────────────────── */
.page { animation: fadeUp .25s ease; }
@keyframes fadeUp { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: translateY(0); } }

/* ── Tabs ──────────────────────────────────────────────────── */
.tabs { display: flex; gap: 0; border-bottom: 2px solid var(--border); margin-bottom: 24px; }
.tab-item { padding: 10px 20px; font-weight: 500; font-size: 0.9rem; cursor: pointer; color: var(--text-m); border-bottom: 2.5px solid transparent; margin-bottom: -2px; transition: var(--transition); }
.tab-item:hover  { color: var(--accent); }
.tab-item.active { color: var(--accent); border-bottom-color: var(--accent); }

/* ── Cashier layout ────────────────────────────────────────── */
.cashier-layout {
  display: flex; height: 100vh; overflow: hidden;
}
.cashier-main {
  flex: 1; overflow-y: auto; padding: 20px;
  margin-right: 340px;
}
.cashier-topbar {
  background: var(--surface); border-bottom: 1px solid var(--border);
  padding: 12px 20px; display: flex; align-items: center; gap: 14px;
  position: sticky; top: 0; z-index: 10;
}

/* Category filter chips */
.chip-list   { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 16px; }
.chip {
  padding: 6px 14px; border-radius: 99px; font-size: 0.82rem; font-weight: 500;
  background: var(--surface2); color: var(--text-m); cursor: pointer;
  border: 1.5px solid transparent; transition: var(--transition);
}
.chip:hover  { border-color: var(--accent2); color: var(--accent2); }
.chip.active { background: var(--accent); color: #fff; border-color: var(--accent); }

/* Receipt print styles */
@media print {
  body * { visibility: hidden; }
  #receipt, #receipt * { visibility: visible; }
  #receipt { position: fixed; inset: 0; background: white; padding: 30px; font-family: monospace; }
}