:root {
  --theme-color: #1c1a99;
}

* {
  box-sizing: border-box;
}

body {
  font-family: 'Arial', sans-serif;
  background-color: #f4f4f4;
  margin: 0;
  padding: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

#case-container {
  max-width: 800px;
  margin: 40px auto;
  padding: 20px;
  background-color: #fff;
  border-radius: 8px;
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

#case-header {
  text-align: center;
  font-size: 24px;
  font-weight: bold;
  color: var(--theme-color);
}

/* Panels */
.input-panel,
.output-panel {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.panel-label {
  font-size: 12px;
  font-weight: bold;
  color: #666;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.panel-label-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
}

#text-input,
#text-output {
  width: 100%;
  height: 160px;
  padding: 12px;
  font-family: 'Courier New', Courier, monospace;
  font-size: 14px;
  border: 1px solid #ccc;
  border-radius: 4px;
  resize: vertical;
  line-height: 1.6;
}

#text-input:focus {
  outline: none;
  border-color: var(--theme-color);
}

#text-output {
  background-color: #fafafa;
  color: #333;
}

.stats-bar {
  display: flex;
  gap: 20px;
  font-size: 13px;
  color: #666;
  padding: 4px 2px;
}

.stats-bar strong {
  color: var(--theme-color);
}

/* Button groups */
.button-groups {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.btn-group {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
}

.group-label {
  font-size: 11px;
  font-weight: bold;
  color: #999;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  min-width: 52px;
}

.btn-group button {
  padding: 7px 13px;
  font-size: 13px;
  background-color: #f4f4f4;
  color: #333;
  border: 1px solid #ccc;
  border-radius: 4px;
  cursor: pointer;
  transition: background-color 0.15s, border-color 0.15s, color 0.15s;
  white-space: nowrap;
}

.btn-group button:hover {
  background-color: var(--theme-color);
  color: #fff;
  border-color: var(--theme-color);
}

/* Output actions */
.output-actions {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.btn-icon {
  padding: 6px 12px;
  font-size: 13px;
  background-color: #f4f4f4;
  color: #333;
  border: 1px solid #ccc;
  border-radius: 4px;
  cursor: pointer;
  transition: background-color 0.2s;
}

.btn-icon:hover:not(:disabled) {
  background-color: #e0e0e0;
}

.btn-icon:disabled {
  opacity: 0.4;
  cursor: default;
}

.btn-restore {
  color: var(--theme-color);
  border-color: var(--theme-color);
}

.btn-restore:hover:not(:disabled) {
  background-color: #ededff;
}

.btn-clear {
  color: #c0392b;
  border-color: #ccc;
}

.btn-clear:hover {
  background-color: #fde8e8;
  border-color: #c0392b;
}

/* Toast */
#toast {
  position: fixed;
  top: 40px;
  right: 40px;
  background-color: rgba(0, 0, 0, 0.8);
  color: #fff;
  padding: 10px 20px;
  border-radius: 4px;
  opacity: 0;
  transition: opacity 0.3s ease;
  pointer-events: none;
  z-index: 100;
}

#theme-color-picker {
  position: absolute;
  top: 10px;
  right: 10px;
}

/* Footer */
.footer {
  text-align: center;
  padding: 10px 0;
  background-color: var(--theme-color);
  color: #fff;
  font-size: 14px;
  margin-top: auto;
}

.footer a {
  color: #fff;
  text-decoration: none;
  font-weight: bold;
}

.footer a:hover {
  text-decoration: underline;
}

a.external::after {
  content: "↗";
  margin-left: 4px;
}

@media screen and (max-width: 768px) {
  #case-container {
    margin: 20px 10px;
    padding: 15px;
    gap: 14px;
  }

  #case-header {
    font-size: 20px;
  }
}

@media screen and (max-width: 480px) {
  #case-container {
    margin: 10px 5px;
    padding: 10px;
    gap: 12px;
  }

  #case-header {
    font-size: 18px;
  }

  #text-input,
  #text-output {
    height: 130px;
    font-size: 13px;
  }

  .stats-bar {
    gap: 12px;
    font-size: 12px;
  }

  .btn-group button {
    padding: 6px 10px;
    font-size: 12px;
  }

  .group-label {
    width: 100%;
    min-width: unset;
  }

  #toast {
    right: 10px;
    top: 10px;
    font-size: 13px;
  }

  .footer {
    font-size: 12px;
    padding: 8px 10px;
  }
}