* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
  min-height: 100%;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: #121212;
  color: #e8e8e8;
}

.controls {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  gap: 28px;
  align-items: center;
  padding: 14px 20px;
  background: #1e1e1e;
  border-bottom: 1px solid #3a3a3a;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.5);
}

.controls label {
  cursor: pointer;
  user-select: none;
  font-size: 15px;
}

.controls input {
  width: 16px;
  height: 16px;
  margin: 0 8px 0 0;
  vertical-align: -3px;
  accent-color: #888;
}

main {
  max-width: 1100px;
  margin: 24px auto;
  padding: 0 16px;
}

table {
  width: 100%;
  border-collapse: collapse;
  background: #181818;
}

th, td {
  padding: 13px 16px;
  border: 1px solid #363636;
  text-align: left;
  vertical-align: top;
}

th {
  background: #252525;
  color: #f0f0f0;
  font-weight: 600;
  position: sticky;
  top: 52px;
}

tbody tr:nth-child(even) {
  background: #1d1d1d;
}

tbody tr:hover {
  background: #292929;
}

td {
  color: #ddd;
}

/* Deliberately subtle number column */
.number-header,
.number {
  width: 48px;
  padding-left: 8px;
  padding-right: 8px;
  text-align: right;
  color: #666;
  font-size: 12px;
}

.number-header {
  color: #666;
  font-weight: 500;
}

.error {
  margin-top: 20px;
  color: #ff8080;
}

.sentence-tag td {
  background: #303030;
  color: #f0c674;
  font-weight: 600;
  font-size: 14px;
  letter-spacing: 0.02em;
  padding-top: 9px;
  padding-bottom: 9px;
  border-top: 2px solid #555;
  border-bottom: 2px solid #555;
}