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

body {
  font-family: "Sarabun", "Noto Sans Thai", "Thonburi", sans-serif;
  background: #f5f7fa;
  color: #222;
  line-height: 1.6;
  padding: 2rem 1rem;
}

.container {
  max-width: 720px;
  margin: 0 auto;
}

h1 {
  font-size: 1.8rem;
  margin-bottom: 0.25rem;
}

.subtitle {
  color: #666;
  margin-bottom: 1.5rem;
}

form {
  display: flex;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

input[type="file"] {
  flex: 1;
  padding: 0.5rem;
  border: 1px solid #ccc;
  border-radius: 6px;
}

button {
  padding: 0.5rem 1.5rem;
  border: none;
  border-radius: 6px;
  background: #2563eb;
  color: #fff;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
}

button:disabled {
  background: #999;
  cursor: not-allowed;
}

.status {
  color: #555;
  margin: 0.5rem 0;
}

.error {
  color: #dc2626;
  background: #fef2f2;
  border: 1px solid #fecaca;
  border-radius: 6px;
  padding: 0.75rem 1rem;
  margin: 0.5rem 0;
}

.hidden {
  display: none;
}

.result {
  background: #fff;
  border: 1px solid #e5e7eb;
  border-radius: 8px;
  padding: 1.25rem;
  margin-top: 1rem;
}

.summary {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.5rem 1.5rem;
  margin-bottom: 1.25rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid #eee;
}

.summary span {
  color: #666;
}

table {
  width: 100%;
  border-collapse: collapse;
}

th, td {
  text-align: left;
  padding: 0.6rem 0.5rem;
  border-bottom: 1px solid #eee;
}

th {
  background: #f9fafb;
  font-weight: 600;
  font-size: 0.9rem;
}

td:nth-child(2),
td:nth-child(3),
td:nth-child(4) {
  text-align: right;
  font-variant-numeric: tabular-nums;
}