*, *::before, *::after {
  box-sizing: border-box;
}

:root {
  --max-width: 700px;
  --spacing: 1rem;
  --spacing-sm: 0.5rem;
  --border-color: #c4cfd6;
  --bg-subtle: #f7f9fa;
  --text-muted: #5a6a72;
  --error-color: #8b3a3a;
  --success-color: #2d5a4a;
  --text-color: #1a2e3b;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.5;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--spacing);
  color: var(--text-color);
  background: #fafbfc;
}

h1, h2, h3 {
  letter-spacing: 0.02em;
}

h1 {
  margin: 0 0 var(--spacing-sm) 0;
  font-size: 1.5rem;
}

h1 small {
  font-weight: normal;
  color: var(--text-muted);
  font-size: 0.9rem;
}

/* API Key within Settings */
.api-key-group {
  padding-bottom: var(--spacing);
  margin-bottom: var(--spacing);
  border-bottom: 1px solid var(--border-color);
}

.api-key-row {
  display: flex;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
}

.api-key-row input {
  flex: 1;
  min-width: 150px;
  padding: 0.5rem;
  border: 1px solid var(--border-color);
  border-radius: 4px;
  font-size: 0.9rem;
}

.api-key-status {
  font-size: 0.85rem;
  margin-top: var(--spacing-sm);
  color: var(--text-muted);
}

.api-key-status.saved {
  color: var(--success-color);
}

.api-key-status.missing {
  color: var(--error-color);
}

/* Buttons */
button {
  padding: 0.5rem 1rem;
  border: 1px solid var(--border-color);
  border-radius: 4px;
  background: white;
  cursor: pointer;
  font-size: 0.9rem;
}

button:hover {
  background: var(--bg-subtle);
}

button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

button.primary {
  background: var(--text-color);
  color: white;
  border-color: var(--text-color);
}

button.primary:hover {
  background: #2a4a5a;
}

button.primary:disabled {
  background: #7a8a92;
  border-color: #7a8a92;
}

/* Settings Panel */
.settings-panel {
  border: 1px solid var(--border-color);
  border-radius: 4px;
  margin-bottom: var(--spacing);
}

.settings-toggle {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  padding: var(--spacing);
  background: none;
  border: none;
  border-radius: 4px;
  font-size: 1rem;
  text-align: left;
}

.settings-toggle:hover {
  background: var(--bg-subtle);
}

.settings-toggle-content {
  flex: 1;
}

.settings-toggle-title {
  font-weight: 500;
}

.settings-toggle-summary {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 0.25rem;
}

.settings-panel.open .settings-toggle-summary {
  display: none;
}

.settings-toggle-icon {
  font-size: 1.2rem;
  color: var(--text-muted);
  margin-left: var(--spacing-sm);
}

.settings-panel.open .settings-toggle-icon::after {
  content: "\2212";
}

.settings-toggle-icon::after {
  content: "+";
}

.settings-content {
  display: none;
  padding: 0 var(--spacing) var(--spacing);
}

.settings-panel.open .settings-content {
  display: block;
}

.setting-group {
  margin-bottom: var(--spacing);
}

.setting-group:last-child {
  margin-bottom: 0;
}

.setting-group label {
  display: block;
  font-weight: 500;
  margin-bottom: var(--spacing-sm);
}

.setting-group .hint {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 0.25rem;
}

/* Radio groups */
.radio-group {
  display: flex;
  gap: var(--spacing);
  flex-wrap: wrap;
}

.radio-group label {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  font-weight: normal;
  cursor: pointer;
}

/* Select */
select {
  padding: 0.5rem;
  border: 1px solid var(--border-color);
  border-radius: 4px;
  font-size: 0.9rem;
  background: white;
}

/* Input Section */
.input-section {
  margin-bottom: var(--spacing);
}

.input-section label {
  display: block;
  font-weight: 500;
  margin-bottom: var(--spacing-sm);
}

.input-section textarea {
  width: 100%;
  min-height: 150px;
  padding: var(--spacing);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  font-family: inherit;
  font-size: 1rem;
  line-height: 1.5;
  resize: vertical;
}

.input-section textarea:focus {
  outline: 2px solid var(--text-color);
  outline-offset: -1px;
}

.input-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: var(--spacing-sm);
}

.char-count {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.char-count.warning {
  color: var(--error-color);
}

/* Results Section */
.results-section {
  display: none;
  margin-top: var(--spacing);
  padding-top: var(--spacing);
  border-top: 2px solid var(--border-color);
}

.results-section.visible {
  display: block;
}

/* Result groups */
.result-group {
  border: 1px solid var(--border-color);
  border-radius: 4px;
  margin-bottom: var(--spacing);
  overflow: hidden;
}

.result-group-header {
  background: var(--bg-subtle);
  padding: var(--spacing-sm) var(--spacing);
  font-weight: 500;
  font-size: 0.85rem;
  text-transform: uppercase;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border-color);
}

.result-block {
  padding: var(--spacing);
  border-bottom: 1px solid var(--border-color);
}

.result-block:last-child {
  border-bottom: none;
}

.result-block h3 {
  margin: 0 0 var(--spacing-sm) 0;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-muted);
}

.result-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-sm);
}

.result-header h3 {
  margin: 0;
}

/* Copy button */
.copy-btn {
  padding: 0.25rem 0.5rem;
  font-size: 0.75rem;
  border: 1px solid var(--border-color);
  background: white;
  border-radius: 3px;
  cursor: pointer;
}

.copy-btn:hover {
  background: var(--bg-subtle);
}

.copy-btn.copied {
  background: var(--success-color);
  color: white;
  border-color: var(--success-color);
}

/* Diff highlighting */
.diff-text del {
  background: #fdd;
  color: #900;
  text-decoration: line-through;
  padding: 0 2px;
  border-radius: 2px;
}

.diff-text ins {
  background: #dfd;
  color: #060;
  text-decoration: none;
  padding: 0 2px;
  border-radius: 2px;
}

/* Explanations list */
.explanation-item {
  margin-bottom: 0.75rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border-color);
}

.explanation-item:last-child {
  border-bottom: none;
  margin-bottom: 0;
  padding-bottom: 0;
}

.explanation-badge {
  display: inline-block;
  padding: 0.125rem 0.375rem;
  border-radius: 3px;
  font-size: 0.75rem;
}

.explanation-badge.error {
  background: #fee;
  color: var(--error-color);
}

.explanation-badge.improvement {
  background: #eef;
  color: #006;
}

.explanation-badge.bokmål {
  background: #fff3e0;
  color: #e65100;
}

.explanation-badge.spelling {
  background: #fee;
  color: #8b3a3a;
}

.explanation-badge.grammar {
  background: #fee;
  color: #8b3a3a;
}

.explanation-badge.punctuation {
  background: #f3e5f5;
  color: #6a1b9a;
}

.explanation-badge.style {
  background: #eef;
  color: #006;
}

.explanation-change {
  margin-left: 0.5rem;
}

.explanation-brief {
  color: var(--text-muted);
  margin-top: 0.25rem;
}

.explanation-details {
  margin-top: 0.5rem;
}

.explanation-details summary {
  cursor: pointer;
  color: #006;
  font-size: 0.85rem;
}

.explanation-details-content {
  margin-top: 0.5rem;
  padding-left: 1rem;
  border-left: 2px solid var(--border-color);
}

/* Warnings/Notes block */
.warnings-block {
  padding: var(--spacing);
  margin-bottom: calc(var(--spacing) * 1.5);
  border-radius: 4px;
  border: 1px solid #ba0c2f;
  background: #eef2f7;
}

.warnings-block p {
  margin: 0 0 0.5rem 0;
}

.warnings-block p:last-child {
  margin-bottom: 0;
}

/* Success block */
.success-block {
  padding: var(--spacing);
  margin-bottom: calc(var(--spacing) * 1.5);
  border-radius: 4px;
  border: 1px solid var(--success-color);
  background: #f0f7f4;
  color: var(--success-color);
}

/* Translation notes */
.translation-notes {
  margin-top: var(--spacing);
  padding-top: var(--spacing);
  border-top: 1px solid var(--border-color);
}

.translation-notes-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: var(--spacing-sm);
}

.translation-note {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.5rem 1rem;
  margin-bottom: 0.5rem;
  font-size: 0.9rem;
}

.translation-note:last-child {
  margin-bottom: 0;
}

.translation-note-literal {
  color: var(--text-muted);
  font-style: italic;
}

.translation-note-meaning {
  color: var(--text-color);
}

/* Loading state */
.loading {
  text-align: center;
  padding: calc(var(--spacing) * 2);
  color: var(--text-muted);
}

.loading::after {
  content: "";
  display: inline-block;
  width: 1em;
  height: 1em;
  border: 2px solid var(--border-color);
  border-top-color: var(--text-color);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin-left: 0.5rem;
  vertical-align: middle;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

button.loading-btn {
  pointer-events: none;
}

button.loading-btn .spinner {
  display: inline-block;
  width: 0.9em;
  height: 0.9em;
  border: 2px solid rgba(255,255,255,0.3);
  border-top-color: white;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  vertical-align: middle;
  margin-right: 0.4em;
}

/* Error message */
.error-message {
  background: #fee;
  border: 1px solid var(--error-color);
  color: var(--error-color);
  padding: var(--spacing);
  border-radius: 4px;
  margin-bottom: var(--spacing);
}

/* Footer */
footer {
  margin-top: calc(var(--spacing) * 2);
  padding-top: var(--spacing);
  border-top: 1px solid var(--border-color);
  font-size: 0.85rem;
  color: var(--text-muted);
}