:root {
  --bg: #f1f5f9;
  --card: #fff;
  --p: #2563eb;
  --suc: #16a34a;
  --dan: #dc2626;
  --warn: #ca8a04;
  --t: #1e293b;
  --b: #e2e8f0;
}
* { box-sizing: border-box; margin: 0; padding: 0; font-family: system-ui, sans-serif; }
body { background: var(--bg); color: var(--t); }
.hidden { display: none !important; }
.err { color: var(--dan); font-size: 0.9rem; margin-top: 0.5rem; }
.info { padding: 8px; margin-top: 10px; border-radius: 6px; font-size: 0.9rem; }
.ok { background: #dcfce7; color: #166534; }
.err-info { background: #fee2e2; color: #991b1b; }

/* Auth */
#auth-screen {
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #1e293b;
}
.login-card {
  background: var(--card);
  padding: 2rem;
  border-radius: 12px;
  width: 320px;
  box-shadow: 0 8px 30px rgba(0,0,0,0.12);
}
.login-card h2 { margin-bottom: 1rem; text-align: center; }
input, select, button {
  width: 100%;
  padding: 0.75rem;
  margin: 0.4rem 0;
  border: 1px solid var(--b);
  border-radius: 8px;
}
button {
  cursor: pointer;
  background: var(--p);
  color: #fff;
  font-weight: 500;
  transition: opacity 0.2s;
}
button:hover { opacity: 0.9; }
button:disabled { opacity: 0.5; cursor: not-allowed; }
.link {
  background: none;
  border: none;
  color: var(--p);
  padding: 0;
  margin-top: 1rem;
  width: auto;
}

/* Header */
.bar {
  background: var(--card);
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--b);
}
.brand { font-weight: 700; color: var(--p); font-size: 1.2rem; }
.meta { display: flex; gap: 1rem; align-items: center; }
.badge {
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 600;
}
.badge.on { background: #dcfce7; color: var(--suc); }
#logout {
  width: auto;
  padding: 0.4rem 1rem;
  background: var(--b);
  color: var(--t);
}

/* Tabs */
.tabs {
  background: var(--card);
  padding: 0 2rem;
  display: flex;
  gap: 0.5rem;
  border-bottom: 1px solid var(--b);
}
.tab {
  padding: 1rem 1.5rem;
  background: none;
  border: none;
  cursor: pointer;
  color: #64748b;
  border-bottom: 3px solid transparent;
  font-weight: 500;
}
.tab.active {
  color: var(--p);
  border-bottom-color: var(--p);
  background: #eff6ff;
}

/* Screens */
.screen { padding: 1.5rem 2rem; }
.panel {
  background: var(--card);
  padding: 1.5rem;
  border-radius: 12px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.08);
}
h3 { margin-bottom: 1rem; color: var(--t); }

/* Tables */
table { width: 100%; border-collapse: collapse; margin-top: 1rem; }
th, td {
  padding: 0.75rem;
  border-bottom: 1px solid var(--b);
  text-align: left;
  font-size: 0.95rem;
}
th { background: #f8fafc; font-weight: 600; color: #475569; }
tr:hover { background: #f8fafc; }

/* Forms */
.row { display: flex; gap: 0.5rem; margin-bottom: 0.75rem; flex-wrap: wrap; }
.row > * { flex: 1; min-width: 120px; }
.sm { padding: 0.4rem 0.8rem; width: auto; font-size: 0.85rem; }
.pri { background: var(--p); }
.suc { background: var(--suc); }
.dan { background: var(--dan); }
.warn { background: var(--warn); }
.big { padding: 1rem; font-size: 1rem; margin-top: 1rem; }

/* PO Table */
#po-tb input {
  width: 80px;
  padding: 0.3rem;
  margin: 0;
  font-size: 0.9rem;
}

/* Summary */
.sum {
  margin-top: 1.5rem;
  padding-top: 1rem;
  border-top: 2px dashed var(--b);
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.g { font-weight: 700; font-size: 1.3rem; color: var(--p); }

/* Stock Ledger Colors */
td span { font-weight: 600; }
td[style*="#16a34a"] { color: #16a34a !important; }
td[style*="#dc2626"] { color: #dc2626 !important; }

/* Responsive */
@media (max-width: 768px) {
  .row { flex-direction: column; }
  .row > * { width: 100%; }
  table { font-size: 0.85rem; }
  th, td { padding: 0.5rem; }
  .tabs { overflow-x: auto; padding: 0 1rem; }
  .tab { padding: 1rem; white-space: nowrap; }
  .screen { padding: 1rem; }
}