* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: #f1f5f9;
  color: #1e293b;
  min-height: 100vh;
}

.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 20px 16px 40px;
}

h1 {
  font-size: 1.6rem;
  color: #1e293b;
  text-align: center;
  margin-bottom: 4px;
  line-height: 1.3;
}

.subtitle {
  text-align: center;
  color: #64748b;
  font-size: 0.9rem;
  margin-bottom: 24px;
}

.card {
  background: #fff;
  border-radius: 12px;
  padding: 20px;
  box-shadow: 0 1px 4px rgba(0,0,0,0.08);
  margin-bottom: 24px;
}

h2 {
  font-size: 1rem;
  font-weight: 700;
  color: #334155;
  margin-bottom: 16px;
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin-bottom: 16px;
}

@media (max-width: 480px) {
  .form-grid {
    grid-template-columns: 1fr;
  }
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

label {
  font-size: 0.82rem;
  font-weight: 600;
  color: #475569;
}

input {
  padding: 9px 12px;
  border: 1.5px solid #cbd5e1;
  border-radius: 8px;
  font-size: 0.95rem;
  transition: border-color 0.15s;
  width: 100%;
}

input:focus {
  outline: none;
  border-color: #2563eb;
}

.btn-primary {
  background: #2563eb;
  color: #fff;
  border: none;
  border-radius: 8px;
  padding: 11px 24px;
  font-size: 0.95rem;
  font-weight: 700;
  cursor: pointer;
  width: 100%;
  transition: background 0.15s;
}

.btn-primary:hover {
  background: #1d4ed8;
}

.result-section {
  background: #fff;
  border-radius: 12px;
  padding: 20px;
  box-shadow: 0 1px 4px rgba(0,0,0,0.08);
}

.result-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}

.count-badge {
  background: #dbeafe;
  color: #1d4ed8;
  font-size: 0.78rem;
  padding: 2px 8px;
  border-radius: 99px;
  margin-left: 8px;
  font-weight: 600;
}

.btn-danger {
  background: #fee2e2;
  color: #dc2626;
  border: none;
  border-radius: 8px;
  padding: 7px 16px;
  font-size: 0.85rem;
  font-weight: 700;
  cursor: pointer;
  transition: background 0.15s;
}

.btn-danger:hover {
  background: #fecaca;
}

.empty-msg {
  text-align: center;
  color: #94a3b8;
  font-size: 0.9rem;
  padding: 32px 0;
}

.hidden {
  display: none;
}

.table-wrap {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
  min-width: 600px;
}

thead tr {
  background: #f8fafc;
}

th {
  text-align: left;
  padding: 10px 12px;
  font-size: 0.78rem;
  font-weight: 700;
  color: #64748b;
  border-bottom: 2px solid #e2e8f0;
  white-space: nowrap;
}

td {
  padding: 11px 12px;
  border-bottom: 1px solid #f1f5f9;
  vertical-align: middle;
}

tbody tr:last-child td {
  border-bottom: none;
}

tbody tr:hover {
  background: #f8fafc;
}

.product-name {
  font-weight: 600;
  color: #1e293b;
}

.price {
  font-variant-numeric: tabular-nums;
  text-align: right;
}

.rate-up {
  color: #dc2626;
  font-weight: 700;
}

.margin-rate {
  color: #059669;
  font-weight: 700;
}

.recommended-price {
  color: #2563eb;
  font-weight: 700;
  font-size: 1rem;
}

.profit {
  color: #059669;
}

.btn-delete {
  background: none;
  border: none;
  color: #94a3b8;
  cursor: pointer;
  font-size: 1.1rem;
  padding: 4px 8px;
  border-radius: 6px;
  transition: color 0.15s, background 0.15s;
}

.btn-delete:hover {
  color: #dc2626;
  background: #fee2e2;
}