body {
  font-family: "Helvetica Neue", "Segoe UI", Arial, sans-serif;
  background-color: #f4f4f4;
  color: #222;
  scrollbar-gutter: stable;
}

.tool-container {
  margin-top: 30px;
  margin-bottom: 60px;
}

.navbar-inverse {
  background-color: #1b222d;
  border-color: #080808;
}

.flex-navbar {
  display: flex;
  color: white;
  font-weight: bold;
  justify-content: space-between;
  align-items: center;
  width: 100%;
}

.brand-container {
  display: flex;
  align-items: center;
}

.brand-title,
.brand-title:hover {
  color: white;
  font-weight: bold;
  font-size: 15px;
  text-decoration: none;
}

.flex-navbar-right {
  display: flex;
  align-items: center;
  gap: 12px;
}

.starter-template {
  padding: 10px 0 20px;
  text-align: left;
}

.starter-template h1 {
  font-weight: 700;
  margin: 0 0 8px;
}

.starter-template p {
  color: #6b6b6b;
  margin: 0;
}

.tool-panel {
  background: #ffffff;
  border: 1px solid #dedede;
  border-radius: 12px;
  padding: 16px;
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.04);
  margin-bottom: 16px;
}

.swap-flash {
  animation: swapPulse 0.5s ease;
  border-color: #9fc0ff;
  box-shadow: 0 0 0 3px rgba(94, 129, 244, 0.15), 0 10px 24px rgba(0, 0, 0, 0.06);
}

@keyframes swapPulse {
  0% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-2px);
  }
  100% {
    transform: translateY(0);
  }
}

.controls-panel {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px;
  align-items: center;
}

.controls-left {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  align-items: center;
}

.controls-right {
  display: flex;
  gap: 8px;
}

.text-panels {
  margin-bottom: 8px;
}

.text-panel-left,
.text-panel-right {
  width: 100%;
}

.swap-column {
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
}

.swap-button {
  width: 52px;
  height: 52px;
  border-radius: 50%;
  border: 1px solid #e2e2e2;
  background: #ffffff;
  color: #1b222d;
  box-shadow: 0 6px 12px rgba(0, 0, 0, 0.06);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.swap-button:hover {
  transform: translateY(-1px);
  box-shadow: 0 10px 16px rgba(0, 0, 0, 0.08);
}

@media (min-width: 992px) {
  .text-panels {
    display: flex;
    align-items: stretch;
    gap: 12px;
  }

  .text-panels > .col-sm-12 {
    float: none;
    width: auto;
  }

  .text-panel-left,
  .text-panel-right {
    flex: 1 1 0;
  }

  .swap-column {
    flex: 0 0 52px;
    margin-bottom: 0;
  }

  .swap-button {
    width: 46px;
    height: 46px;
  }
}

.checkbox-inline {
  font-weight: 500;
  color: #444;
  margin: 0;
}

.panel-label {
  display: block;
  font-weight: 600;
  margin-bottom: 8px;
  color: #2c2c2c;
}

textarea.form-control {
  min-height: 220px;
  resize: vertical;
  font-family: "SFMono-Regular", "Consolas", "Liberation Mono", monospace;
  font-size: 13px;
  line-height: 1.6;
  border-radius: 10px;
}

.stats-row {
  margin-bottom: 16px;
}

.stat-card {
  background: #ffffff;
  border: 1px solid #e2e2e2;
  border-radius: 10px;
  padding: 12px 8px;
  text-align: center;
  box-shadow: 0 6px 12px rgba(0, 0, 0, 0.04);
  margin-bottom: 12px;
}

.stat-card span {
  display: block;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: #7a7a7a;
}

.stat-card strong {
  font-size: 22px;
  color: #1b222d;
}

.diff-panel {
  padding: 0;
  overflow: hidden;
}

.diff-header {
  display: flex;
  background: #f7f7f7;
  border-bottom: 1px solid #e1e1e1;
  font-weight: 600;
  color: #555;
}

.diff-header span {
  width: 50%;
  padding: 10px 16px;
}

.diff-view {
  max-height: 520px;
  overflow: auto;
}

.diff-row {
  display: flex;
  border-bottom: 1px solid #f1f1f1;
}

.diff-row:last-child {
  border-bottom: none;
}

.diff-cell {
  width: 50%;
  display: flex;
  gap: 10px;
  padding: 8px 12px;
  font-family: "SFMono-Regular", "Consolas", "Liberation Mono", monospace;
  font-size: 12.5px;
  line-height: 1.5;
}

.diff-cell.is-add {
  background: #e9f7ef;
}

.diff-cell.is-remove {
  background: #fdeeee;
}

.diff-cell.is-change {
  background: #fff6e5;
}

.diff-cell.is-equal {
  background: #ffffff;
}

.diff-cell.is-empty {
  background: #fafafa;
  color: #b9b9b9;
}

.line-number {
  width: 40px;
  text-align: right;
  color: #9b9b9b;
  font-variant-numeric: tabular-nums;
}

.line-text {
  white-space: pre-wrap;
  word-break: break-word;
}

.token.add {
  background: rgba(46, 125, 87, 0.18);
  color: #246b4a;
}

.token.delete {
  background: rgba(209, 52, 67, 0.18);
  color: #b22d3c;
  text-decoration: line-through;
}

.empty-state {
  padding: 24px;
  text-align: center;
  color: #7a7a7a;
}

.modal-content a {
  font-weight: bold;
}

.about-notice {
  background-color: #ecf0ff;
  padding: 16px;
  border-radius: 10px;
}

.about-icon-container {
  display: inline-flex;
  gap: 10px;
  float: left;
}

.btn {
  border-radius: 8px;
}

.modal-footer {
  justify-content: space-between;
}

@media (max-width: 767px) {
  .controls-panel {
    flex-direction: column;
    align-items: flex-start;
  }

  .controls-right {
    width: 100%;
    flex-wrap: wrap;
  }

  .swap-column {
    margin: -6px 0 10px;
  }

  .swap-button {
    width: 46px;
    height: 46px;
  }

  .swap-button svg {
    transform: rotate(90deg);
  }

  .diff-header {
    display: none;
  }

  .diff-row {
    flex-direction: column;
  }

  .diff-cell,
  .diff-header span {
    width: 100%;
  }

  .diff-cell::before {
    content: attr(data-label);
    display: block;
    font-size: 10px;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: #6b6b6b;
    margin-bottom: 4px;
    font-weight: 600;
  }
}