/* ============ ShopBooks — Professional Accounting UI (Light) ============ */
:root {
  --bg: #f1f5f9;
  --bg-grad: linear-gradient(180deg, #eef2f7 0%, #f8fafc 100%);
  --panel: #ffffff;
  --panel-border: #e2e8f0;
  --text: #0f172a;
  --muted: #64748b;
  --faint: #94a3b8;
  --primary: #4f46e5;
  --primary-dark: #4338ca;
  --primary-soft: #eef2ff;
  --green: #059669;
  --green-soft: #ecfdf5;
  --red: #dc2626;
  --red-soft: #fef2f2;
  --orange: #d97706;
  --orange-soft: #fffbeb;
  --blue: #2563eb;
  --blue-soft: #eff6ff;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow-sm: 0 1px 2px rgba(15,23,42,.06), 0 1px 3px rgba(15,23,42,.08);
  --shadow-md: 0 4px 6px -1px rgba(15,23,42,.08), 0 2px 4px -2px rgba(15,23,42,.06);
  --shadow-lg: 0 10px 15px -3px rgba(15,23,42,.08), 0 4px 6px -4px rgba(15,23,42,.06);
  --ring: 0 0 0 3px rgba(79,70,229,.15);
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { color-scheme: light; }
body {
  font-family: "Be Vietnam Pro", -apple-system, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  background-image: var(--bg-grad);
  background-attachment: fixed;
  color: var(--text);
  min-height: 100vh;
  font-size: 15px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}
::selection { background: rgba(79,70,229,.18); }
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-thumb { background: #cbd5e1; border-radius: 8px; border: 2px solid var(--bg); }
::-webkit-scrollbar-thumb:hover { background: #94a3b8; }
::-webkit-scrollbar-track { background: transparent; }

/* ---------- Header ---------- */
header {
  position: sticky; top: 0; z-index: 50;
  display: flex; align-items: center; flex-wrap: wrap;
  padding: 0 24px;
  background: rgba(255,255,255,.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--panel-border);
  box-shadow: 0 1px 3px rgba(15,23,42,.05);
}
.logo {
  font-size: 20px; font-weight: 800; letter-spacing: -.02em;
  padding: 16px 28px 16px 0;
  color: var(--text);
  display: flex; align-items: center; gap: 8px;
}
.logo::first-letter { color: var(--primary); }
nav { display: flex; flex-wrap: wrap; gap: 2px; }
.nav {
  background: none; border: none; color: var(--muted);
  font-size: 14px; font-family: inherit; font-weight: 600;
  padding: 18px 14px; cursor: pointer; position: relative;
  transition: color .15s ease;
}
.nav::after {
  content: ""; position: absolute; left: 14px; right: 14px; bottom: 0;
  height: 3px; border-radius: 3px 3px 0 0; background: var(--primary);
  transform: scaleX(0); transform-origin: center;
  transition: transform .18s ease;
}
.nav:hover { color: var(--text); }
.nav.active { color: var(--primary); }
.nav.active::after { transform: scaleX(1); }
#langSel {
  font-family: inherit; cursor: pointer;
  border: 1px solid var(--panel-border) !important;
  border-radius: var(--radius-sm) !important;
  background: #fff !important;
  color: var(--text); font-weight: 600;
  box-shadow: var(--shadow-sm);
  transition: border-color .15s, box-shadow .15s;
}
#langSel:hover { border-color: #c7d2fe !important; }
#langSel:focus { outline: none; box-shadow: var(--ring); }

/* ---------- Layout ---------- */
main {
  max-width: 1280px; margin: 0 auto;
  padding: 28px 24px 64px;
}
h2 {
  font-size: 22px; font-weight: 800; letter-spacing: -.02em;
  margin-bottom: 18px; color: var(--text);
  display: flex; align-items: center; gap: 12px;
}
h2::after { content: ""; flex: 1; height: 1px; background: var(--panel-border); }
h2 .btn { margin-left: auto; }
p { color: var(--muted); }

/* ---------- Stat Cards ---------- */
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  gap: 16px; margin-bottom: 22px;
}
.card {
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: var(--radius);
  padding: 18px 20px 16px;
  box-shadow: var(--shadow-sm);
  position: relative; overflow: hidden;
  transition: transform .15s ease, box-shadow .15s ease;
}
.card:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); }
.card::before {
  content: ""; position: absolute; left: 0; top: 0; bottom: 0;
  width: 4px; background: #cbd5e1;
}
.card .label {
  font-size: 12.5px; font-weight: 700; text-transform: uppercase;
  letter-spacing: .06em; color: var(--muted); margin-bottom: 8px;
}
.card .value {
  font-size: 26px; font-weight: 800; letter-spacing: -.02em;
  font-variant-numeric: tabular-nums; line-height: 1.15;
}
.card.blue::before  { background: var(--blue); }
.card.blue .value   { color: var(--blue); }
.card.green::before { background: var(--green); }
.card.green .value  { color: var(--green); }
.card.red::before   { background: var(--red); }
.card.red .value    { color: var(--red); }
.card.orange::before{ background: var(--orange); }
.card.orange .value { color: var(--orange); }

/* ---------- Panels ---------- */
.panel {
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: var(--radius);
  padding: 22px;
  box-shadow: var(--shadow-sm);
  margin-bottom: 20px;
}
.panel h2 { margin-top: 0; }

/* ---------- Forms ---------- */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
  gap: 12px; margin-bottom: 16px;
}
input, select {
  font-family: inherit; font-size: 14px; color: var(--text);
  background: #fff;
  border: 1px solid var(--panel-border);
  border-radius: var(--radius-sm);
  padding: 9px 12px;
  transition: border-color .15s, box-shadow .15s;
  width: 100%;
}
input::placeholder { color: var(--faint); }
input:hover, select:hover { border-color: #cbd5e1; }
input:focus, select:focus {
  outline: none; border-color: var(--primary); box-shadow: var(--ring);
}
input[type="number"] { font-variant-numeric: tabular-nums; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  font-family: inherit; font-size: 14px; font-weight: 700;
  background: var(--primary); color: #fff;
  border: none; border-radius: var(--radius-sm);
  padding: 10px 16px; cursor: pointer;
  box-shadow: var(--shadow-sm);
  transition: background .15s, transform .1s, box-shadow .15s;
  text-decoration: none; white-space: nowrap;
}
.btn:hover { background: var(--primary-dark); box-shadow: var(--shadow-md); }
.btn:active { transform: translateY(1px); }
.btn.small {
  padding: 6px 12px; font-size: 12.5px; font-weight: 600;
  background: #fff; color: var(--primary);
  border: 1px solid #c7d2fe;
}
.btn.small:hover { background: var(--primary-soft); border-color: var(--primary); }
.btn.danger {
  background: var(--red); color: #fff; border: none;
}
.btn.danger:hover { background: #b91c1c; }
.btn.danger.small {
  background: #fff; color: var(--red); border: 1px solid #fecaca;
}
.btn.danger.small:hover { background: var(--red-soft); border-color: var(--red); }

/* ---------- Tables ---------- */
table { width: 100%; border-collapse: collapse; font-size: 14px; }
th {
  text-align: left; font-size: 12px; font-weight: 700;
  text-transform: uppercase; letter-spacing: .05em; color: var(--muted);
  padding: 10px 14px;
  background: #f8fafc;
  border-bottom: 2px solid var(--panel-border);
  position: sticky; top: 0;
}
td {
  padding: 11px 14px;
  border-bottom: 1px solid #f1f5f9;
  vertical-align: middle;
}
tbody tr { transition: background .12s; }
tbody tr:hover { background: #f8fafc; }
tbody tr:last-child td { border-bottom: none; }
.num { text-align: right; font-variant-numeric: tabular-nums; }
td b { font-weight: 700; }

/* ---------- Badges ---------- */
.badge {
  display: inline-block; padding: 3px 10px;
  border-radius: 999px; font-size: 12px; font-weight: 700;
  letter-spacing: .01em;
}
.badge.paid, .badge.income   { background: var(--green-soft); color: var(--green); }
.badge.unpaid, .badge.expense{ background: var(--red-soft); color: var(--red); }
.badge.partial               { background: var(--orange-soft); color: var(--orange); }

/* ---------- Chart ---------- */
.chart { width: 100%; height: auto; display: block; }
.chart .bar rect, .chart rect.bar { fill: var(--primary); }
.chart rect { fill: var(--primary); transition: fill .15s; }
.chart rect:hover { fill: var(--primary-dark); }

/* ---------- POS ---------- */
.pos {
  display: grid; grid-template-columns: 1.5fr 1fr;
  gap: 20px; align-items: start;
}
.prod-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 12px;
  max-height: 560px; overflow-y: auto; padding-right: 4px;
}
.prod {
  background: #f8fafc;
  border: 1px solid var(--panel-border);
  border-radius: var(--radius-sm);
  padding: 12px; cursor: pointer;
  transition: transform .12s ease, border-color .12s, box-shadow .12s, background .12s;
}
.prod:hover {
  transform: translateY(-2px);
  border-color: var(--primary);
  background: var(--primary-soft);
  box-shadow: var(--shadow-md);
}
.prod:active { transform: scale(.98); }
.prod .name { font-size: 13.5px; font-weight: 600; min-height: 40px; color: var(--text); }
.prod .price { font-size: 15px; font-weight: 800; margin-top: 6px; color: var(--primary); font-variant-numeric: tabular-nums; }
.prod .stock { font-size: 11.5px; color: var(--muted); margin-top: 3px; }

/* ---------- Cart ---------- */
.cart-row {
  display: flex; align-items: center; gap: 10px;
  padding: 9px 0; border-bottom: 1px solid #f1f5f9;
  font-size: 14px;
}
.cart-row b { font-variant-numeric: tabular-nums; }
.qty { display: inline-flex; align-items: center; gap: 6px; font-weight: 700; }
.qty button {
  width: 26px; height: 26px; border-radius: 6px;
  border: 1px solid var(--panel-border); background: #fff;
  font-size: 15px; font-weight: 700; color: var(--primary);
  cursor: pointer; line-height: 1;
  transition: background .12s, border-color .12s;
}
.qty button:hover { background: var(--primary-soft); border-color: var(--primary); }
.totals { margin-top: 14px; border-top: 2px solid var(--panel-border); padding-top: 12px; }
.totals > div {
  display: flex; justify-content: space-between; align-items: center;
  padding: 5px 0; font-size: 14px;
}
.totals > div span { color: var(--muted); }
.totals > div b { font-variant-numeric: tabular-nums; font-size: 15px; }
.totals > div:last-child {
  margin-top: 6px; padding-top: 10px;
  border-top: 1px dashed var(--panel-border);
}
.totals > div:last-child b { font-size: 22px; color: var(--primary); font-weight: 800; }

/* ---------- Toast ---------- */
#toast {
  position: fixed; left: 50%; bottom: 28px;
  transform: translateX(-50%);
  background: #0f172a; color: #f8fafc;
  font-size: 14px; font-weight: 600;
  padding: 12px 20px; border-radius: 10px;
  box-shadow: var(--shadow-lg);
  opacity: 0; pointer-events: none;
  transition: opacity .25s ease;
  z-index: 100; max-width: 90vw;
}

/* ---------- QR box ---------- */
#qrBox {
  background: #fff !important;
  border: 1px dashed #94a3b8 !important;
  border-radius: 10px;
}
#qrMsg { color: var(--muted) !important; }
#tChange { color: var(--green) !important; }

/* ---------- Misc ---------- */
a { color: var(--primary); }
hr { border: none; border-top: 1px solid var(--panel-border); margin: 16px 0; }

@media (max-width: 900px) {
  .pos { grid-template-columns: 1fr; }
}
@media (max-width: 640px) {
  .nav { padding: 14px 10px; font-size: 13px; }
  main { padding: 20px 14px 56px; }
  .cards { grid-template-columns: 1fr 1fr; }
  .card .value { font-size: 20px; }
}