:root {
  --bg: #f4f6f8;
  --card: #ffffff;
  --text: #1f2933;
  --muted: #6b7280;
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --danger: #dc2626;
  --danger-bg: #fef2f2;
  --success: #16a34a;
  --success-bg: #f0fdf4;
  --warn: #b45309;
  --warn-bg: #fffbeb;
  --border: #e5e7eb;
  --radius: 10px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 15px;
  line-height: 1.5;
}

a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

.container {
  max-width: 1180px;
  margin: 0 auto;
  padding: 24px 20px 60px;
}

/* Top bar */
.topbar {
  background: var(--card);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 10;
}
.topbar-inner {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  align-items: center;
  gap: 24px;
  height: 58px;
}
.brand { font-weight: 700; font-size: 17px; white-space: nowrap; display: flex; align-items: center; order: 1; }
.brand-logo { height: 34px; width: auto; display: block; }
.nav { display: flex; gap: 4px; flex: 1; flex-wrap: wrap; order: 2; }
.navlink {
  padding: 8px 12px;
  border-radius: 8px;
  color: var(--text);
  font-weight: 500;
  font-size: 14px;
  white-space: nowrap;
}
.navlink:hover { background: var(--bg); text-decoration: none; }
.navlink.active { background: var(--primary); color: #fff; }
.user-box { display: flex; align-items: center; gap: 10px; white-space: nowrap; font-size: 13px; color: var(--muted); order: 3; }

/* Mobile: la barra superior pasa a dos filas (marca+usuario arriba, menu
   deslizable horizontal abajo) en vez de amontonarse o cortarse. */
@media (max-width: 768px) {
  .topbar-inner {
    height: auto;
    flex-wrap: wrap;
    justify-content: space-between;
    padding: 10px 14px;
    gap: 8px 12px;
  }
  .nav {
    order: 4;
    width: 100%;
    flex: 1 1 100%;
    flex-wrap: nowrap;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    gap: 2px;
  }
  .nav::-webkit-scrollbar { display: none; }
  .navlink { flex: 0 0 auto; padding: 7px 10px; font-size: 13.5px; }
  .user-name { max-width: 34vw; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; display: inline-block; vertical-align: middle; }
  .brand-logo { height: 28px; }
}
.user-name small { color: var(--muted); }
.link-btn {
  background: none; border: none; color: var(--primary); cursor: pointer; font: inherit; padding: 0;
}
.link-btn:hover { text-decoration: underline; }

/* Cards */
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 20px;
}
.card h2, .card h3 { margin-top: 0; }

.grid {
  display: grid;
  gap: 16px;
}
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
@media (max-width: 800px) {
  .grid-3, .grid-4, .grid-2 { grid-template-columns: 1fr; }
}

.stat {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 18px;
}
.stat .stat-label { color: var(--muted); font-size: 12.5px; text-transform: uppercase; letter-spacing: .04em; }
.stat .stat-value { font-size: 26px; font-weight: 700; margin-top: 4px; }
.stat .stat-sub { color: var(--muted); font-size: 12.5px; margin-top: 2px; }

/* Forms */
label { display: block; font-size: 13px; font-weight: 600; margin-bottom: 5px; color: #374151; }
input[type=text], input[type=number], input[type=password], input[type=date], input[type=month], input[type=email], input[type=search], select, textarea {
  width: 100%;
  padding: 9px 11px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 14px;
  font-family: inherit;
  background: #fff;
  color: var(--text);
}
input:focus, select:focus, textarea:focus { outline: 2px solid var(--primary); outline-offset: 0; border-color: var(--primary); }
.field { margin-bottom: 14px; }
.field-row { display: flex; gap: 12px; }
.field-row > .field { flex: 1; }
.hint { color: var(--muted); font-size: 12px; margin-top: 4px; }

/* En pantallas angostas, los campos en fila se apilan en vez de
   comprimirse hasta quedar inusables. */
@media (max-width: 640px) {
  .field-row { flex-wrap: wrap; }
  .field-row > .field { flex: 1 1 100%; min-width: 0; }
}

button, .btn {
  display: inline-block;
  padding: 9px 16px;
  border-radius: 8px;
  border: 1px solid transparent;
  background: var(--primary);
  color: #fff;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  font-family: inherit;
}
button:hover, .btn:hover { background: var(--primary-dark); text-decoration: none; }
.btn-secondary { background: #fff; color: var(--text); border-color: var(--border); }
.btn-secondary:hover { background: var(--bg); }
.btn-danger { background: var(--danger); }
.btn-danger:hover { background: #b91c1c; }
.btn-sm { padding: 5px 10px; font-size: 12.5px; }
.btn-block { width: 100%; }
.actions { display: flex; gap: 8px; flex-wrap: wrap; }

/* Tables */
table { width: 100%; border-collapse: collapse; font-size: 14px; }
th, td { text-align: left; padding: 10px 12px; border-bottom: 1px solid var(--border); }
th { color: var(--muted); font-size: 12px; text-transform: uppercase; letter-spacing: .03em; font-weight: 700; }
tr:last-child td { border-bottom: none; }
.table-wrap { overflow-x: auto; }
.text-right { text-align: right; }
.text-center { text-align: center; }
.row-danger td { background: var(--danger-bg); }
.row-warn td { background: var(--warn-bg); }
.muted { color: var(--muted); }
.small { font-size: 12.5px; }

/* Badges */
.badge {
  display: inline-block;
  padding: 2px 9px;
  border-radius: 999px;
  font-size: 11.5px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .02em;
}
.badge-ok { background: var(--success-bg); color: var(--success); }
.badge-warn { background: var(--warn-bg); color: var(--warn); }
.badge-danger { background: var(--danger-bg); color: var(--danger); }
.badge-muted { background: #f3f4f6; color: var(--muted); }

/* Flash messages */
.flash { padding: 12px 16px; border-radius: 8px; margin-bottom: 18px; font-size: 14px; font-weight: 500; }
.flash-success { background: var(--success-bg); color: var(--success); border: 1px solid #bbf7d0; }
.flash-error { background: var(--danger-bg); color: var(--danger); border: 1px solid #fecaca; }
.flash-info { background: #eff6ff; color: var(--primary-dark); border: 1px solid #bfdbfe; }

.page-header { display: flex; justify-content: space-between; align-items: center; gap: 16px; margin-bottom: 18px; flex-wrap: wrap; }
.page-header h1 { margin: 0; font-size: 22px; }

/* Login page */
.login-wrap {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}
.login-card { width: 100%; max-width: 360px; }
.login-card h1 { text-align: center; font-size: 20px; margin-bottom: 4px; }
.login-logo { display: block; width: 100%; max-width: 280px; height: auto; margin: 0 auto 8px; }
.login-card .sub { text-align: center; color: var(--muted); font-size: 13px; margin-bottom: 20px; }

/* POS layout */
.pos-grid { display: grid; grid-template-columns: 1.5fr 1fr; gap: 20px; align-items: start; }
@media (max-width: 900px) { .pos-grid { grid-template-columns: 1fr; } }
#buscar-resultados { margin-top: 10px; max-height: 320px; overflow-y: auto; }
#cliente-resultados { margin-top: 6px; max-height: 180px; overflow-y: auto; }
#cliente-resultados .buscar-item { padding: 6px 8px; margin-bottom: 4px; }
.buscar-item { display: flex; justify-content: space-between; align-items: center; padding: 8px 10px; border: 1px solid var(--border); border-radius: 8px; margin-bottom: 6px; }
.buscar-item button { padding: 5px 10px; font-size: 12.5px; }
.cart-empty { color: var(--muted); text-align: center; padding: 24px 0; }
.cart-item { display: flex; align-items: center; gap: 8px; padding: 8px 0; border-bottom: 1px solid var(--border); }
.cart-item .nombre { flex: 1; font-weight: 600; font-size: 13.5px; }
.cart-item input[type=number] { width: 64px; text-align: center; }
.cart-total-row { display: flex; justify-content: space-between; padding: 6px 0; font-size: 14px; }
.cart-total-row.grand { font-size: 19px; font-weight: 700; border-top: 1px solid var(--border); margin-top: 8px; padding-top: 10px; }

/* Print receipt */
@media print {
  .topbar, .no-print { display: none !important; }
  body { background: #fff; }
  .container { padding: 0; max-width: 100%; }
}
.receipt { max-width: 380px; margin: 0 auto; font-family: "Courier New", monospace; }
.receipt h2 { text-align: center; margin-bottom: 2px; }
.receipt-logo { display: block; width: 100%; max-width: 260px; height: auto; margin: 0 auto 6px; }
.receipt .center { text-align: center; }
.receipt table { font-size: 13px; }
.receipt hr { border: none; border-top: 1px dashed #999; margin: 10px 0; }

.empty-state { text-align: center; padding: 40px 20px; color: var(--muted); }