:root {
  --bg: #f7f8fb;
  --card: #ffffff;
  --text: #222222;
  --accent: #0e6ba8;
  --danger: #b42318;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", Tahoma, sans-serif;
  color: var(--text);
  background: radial-gradient(circle at top right, #ddefff, var(--bg));
}

.container {
  max-width: 900px;
  margin: 0 auto;
  padding: 16px;
}

h1, h2 {
  margin: 8px 0 12px;
}

.card {
  background: var(--card);
  border: 1px solid #d9dee8;
  border-radius: 10px;
  padding: 14px;
  margin-bottom: 12px;
}

.row, .grid {
  display: grid;
  gap: 8px;
  margin-bottom: 8px;
}

.row {
  grid-template-columns: 1fr 1fr;
}

.grid {
  grid-template-columns: 1fr 1fr;
}

input, select, textarea, button {
  width: 100%;
  padding: 10px;
  border-radius: 8px;
  border: 1px solid #c8d0dd;
  font-size: 14px;
}

button {
  background: var(--accent);
  color: #fff;
  border: none;
  cursor: pointer;
}

button:hover {
  opacity: 0.92;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 8px;
}

th, td {
  padding: 8px;
  border-bottom: 1px solid #e2e7f0;
  text-align: left;
}

.low {
  color: var(--danger);
  font-weight: 700;
}

#status {
  position: sticky;
  bottom: 8px;
  background: #fff;
  padding: 8px;
  border-radius: 8px;
  border: 1px solid #d9dee8;
}

#scanner {
  width: 100%;
}

@media (max-width: 700px) {
  .row, .grid {
    grid-template-columns: 1fr;
  }
}