:root {
  --bg: #f7f8fb;
  --surface: #ffffff;
  --border: #e3e6ee;
  --text: #1c2130;
  --text-muted: #6b7280;
  --primary: #4f46e5;
  --primary-hover: #4338ca;
  --primary-soft: #eef1ff;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 1px 2px rgba(16, 24, 40, 0.04), 0 4px 12px rgba(16, 24, 40, 0.06);
  --shadow-sm: 0 1px 2px rgba(16, 24, 40, 0.05);
}

* {
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  max-width: 920px;
  margin: 48px auto;
  padding: 0 20px;
  background-color: var(--bg);
  color: var(--text);
  line-height: 1.5;
}

h1 {
  text-align: center;
  margin-bottom: 32px;
  font-size: 26px;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.editor-wrapper {
  display: flex;
  gap: 20px;
}

.editor-column {
  flex: 1;
  display: flex;
  flex-direction: column;
}

textarea {
  font-family: "SF Mono", Menlo, Consolas, monospace;
  font-size: 13.5px;
  height: 300px;
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  resize: vertical;
  background-color: var(--surface);
  color: var(--text);
  box-shadow: var(--shadow-sm);
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

textarea:focus-visible {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-soft);
}

.output-code {
  display: block;
  font-family: "SF Mono", Menlo, Consolas, monospace;
  font-size: 13.5px;
  height: 300px;
  margin: 0;
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background-color: var(--surface);
  overflow: auto;
  white-space: pre-wrap;
  word-break: break-word;
  box-shadow: var(--shadow-sm);
}

.output-code:empty::before {
  content: attr(data-placeholder);
  color: #a3a9b7;
}

.output-code.has-error {
  color: #b3261e;
  background-color: #fdecea;
  border-color: #f5c6c2;
}

.output-code.has-warning {
  color: #8a6d00;
  background-color: #fff8e1;
  border-color: #ffe082;
}

.css-property {
  border-bottom: 1px dotted #9aa1b0;
  cursor: help;
}

.css-tooltip {
  position: fixed;
  max-width: 260px;
  padding: 8px 10px;
  font-size: 12px;
  line-height: 1.4;
  background-color: #1c2130;
  color: #fff;
  border-radius: var(--radius-sm);
  pointer-events: none;
  z-index: 1000;
  box-shadow: var(--shadow);
}

/* Main "Clean it up" button */
#clean-btn {
  display: block;
  margin: 20px auto 0;
  padding: 12px 28px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  border: none;
  border-radius: 999px;
  background-color: var(--primary);
  color: white;
  box-shadow: var(--shadow);
  transition: background-color 0.15s ease, transform 0.1s ease;
}

#clean-btn:hover {
  background-color: var(--primary-hover);
  transform: translateY(-1px);
}

#clean-btn:active {
  transform: translateY(0);
}

/* Smaller secondary buttons */
.secondary-btn {
  align-self: flex-start;
  margin-top: 10px;
  padding: 8px 16px;
  font-size: 13.5px;
  font-weight: 500;
  cursor: pointer;
  border: none;
  border-radius: var(--radius-sm);
  background-color: #6b7280;
  color: white;
  transition: background-color 0.15s ease, transform 0.1s ease;
}

.secondary-btn:hover {
  transform: translateY(-1px);
  filter: brightness(0.92);
}

.secondary-btn:active {
  transform: translateY(0);
}

#ask-ai-btn {
  background-color: #dc2626;
}

#fix-it-btn {
  background-color: #16a34a;
}

#diff-toggle-btn {
  background-color: #475569;
}

.diff-panel {
  margin-top: 16px;
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background-color: var(--surface);
  font-family: "SF Mono", Menlo, Consolas, monospace;
  font-size: 12.5px;
  max-height: 300px;
  overflow: auto;
  box-shadow: var(--shadow-sm);
}

.diff-line {
  white-space: pre-wrap;
  word-break: break-word;
  padding: 2px 6px;
  border-radius: 4px;
}

.diff-line.diff-added {
  background-color: #e6ffed;
  color: #1a7f37;
}

.diff-line.diff-removed {
  background-color: #ffeef0;
  color: #b3261e;
  text-decoration: line-through;
}

.diff-line.diff-unchanged {
  color: #9aa1b0;
}

.advanced-tools {
  margin-top: 32px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
}

.advanced-tools-title {
  font-size: 16px;
  font-weight: 700;
  margin: 0 0 14px;
  color: var(--text);
}

.tool-accordion {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 10px;
  background-color: var(--surface);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}

.tool-accordion summary {
  cursor: pointer;
  padding: 13px 16px;
  font-weight: 600;
  font-size: 14px;
  list-style: none;
  transition: background-color 0.15s ease;
}

.tool-accordion summary::-webkit-details-marker {
  display: none;
}

.tool-accordion summary::before {
  content: '▸';
  display: inline-block;
  margin-right: 10px;
  color: var(--primary);
  transition: transform 0.15s ease;
}

.tool-accordion[open] summary::before {
  transform: rotate(90deg);
}

.tool-accordion summary:hover {
  background-color: var(--primary-soft);
}

.tool-accordion-content {
  padding: 0 16px 16px;
  display: flex;
  flex-direction: column;
}

.unused-intro {
  margin: 0 0 10px;
  font-size: 12.5px;
  color: var(--text-muted);
  line-height: 1.55;
}

#unused-html-input {
  width: 100%;
  height: 150px;
  box-sizing: border-box;
}

#unused-check-btn {
  background-color: #7c3aed;
}

.unused-results {
  margin-top: 14px;
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background-color: var(--bg);
  font-size: 13px;
  line-height: 1.6;
}

.unused-summary {
  margin: 0 0 8px;
  font-weight: 700;
  color: #8a6d00;
}

.unused-ok {
  margin: 0;
  font-weight: 700;
  color: #1e7d34;
}

.unused-list {
  margin: 0 0 10px;
  padding-left: 20px;
}

.unused-list code {
  background-color: #eceef4;
  padding: 1px 6px;
  border-radius: 4px;
  font-family: "SF Mono", Menlo, Consolas, monospace;
}

.unused-note {
  color: var(--text-muted);
  font-size: 12px;
}

.unused-disclaimer {
  margin: 0;
  font-size: 11px;
  color: #9aa1b0;
  font-style: italic;
}

#specificity-check-btn {
  background-color: #d97706;
}

.conflict-item {
  margin-bottom: 12px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
}

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

.conflict-property {
  font-weight: 700;
  color: #d97706;
}

.conflict-side {
  margin: 4px 0;
  padding-left: 12px;
}

.conflict-winner {
  font-weight: 700;
  color: #1e7d34;
}

.conflict-reason {
  color: var(--text-muted);
  font-size: 12px;
}

#tokens-extract-btn {
  background-color: #0d9488;
}

#tokens-apply-btn {
  background-color: #2563eb;
}

.token-group-title {
  font-weight: 700;
  margin: 10px 0 6px;
}

.token-group-title:first-child {
  margin-top: 0;
}

.token-list {
  list-style: none;
  margin: 0 0 10px;
  padding: 0;
}

.token-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 4px 0;
}

.token-swatch {
  width: 14px;
  height: 14px;
  border-radius: 4px;
  border: 1px solid var(--border);
  flex-shrink: 0;
}

#responsive-generate-btn {
  background-color: #c026d3;
}

.bug-textarea {
  width: 100%;
  height: 70px;
  box-sizing: border-box;
  margin-bottom: 8px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  font-size: 13px;
}

.bug-textarea:last-of-type {
  font-family: "SF Mono", Menlo, Consolas, monospace;
}

#bug-explain-btn {
  background-color: #e11d48;
}

.api-key-section {
  margin-top: 20px;
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 20px;
  box-shadow: var(--shadow-sm);
}

.api-key-section label {
  display: block;
  font-weight: 600;
  margin-bottom: 6px;
  font-size: 13.5px;
}

.provider-row {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 6px;
}

.provider-row label {
  margin-bottom: 0;
}

.icon-btn {
  display: inline-block;
  width: 20px;
  height: 20px;
  padding: 0;
  line-height: 18px;
  text-align: center;
  font-size: 12.5px;
  border: none;
  border-radius: 50%;
  background-color: #d0d4dd;
  color: #4b5060;
  cursor: pointer;
  transition: background-color 0.15s ease;
}

.icon-btn:hover {
  background-color: #b8bdc9;
}

.provider-info-panel {
  margin: 8px 0 14px;
  padding: 10px 12px;
  font-size: 12.5px;
  line-height: 1.5;
  color: #7a5b00;
  background-color: #fff8e1;
  border: 1px solid #ffe082;
  border-radius: var(--radius-sm);
}

#provider-select {
  display: block;
  width: 100%;
  padding: 9px 10px;
  margin-bottom: 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 13.5px;
  background-color: var(--surface);
  color: var(--text);
}

.api-key-row {
  display: flex;
  align-items: center;
  gap: 8px;
}

.api-key-row input {
  flex: 1;
  padding: 9px 10px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 13.5px;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.api-key-row input:focus-visible {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-soft);
}

.api-key-row .secondary-btn {
  margin-top: 0;
  background-color: #6b7280;
}

.api-key-note {
  margin-top: 10px;
  font-size: 12px;
  color: var(--text-muted);
  line-height: 1.55;
}

.api-key-note a {
  color: var(--primary);
}

.column-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 8px;
}

.column-header label {
  margin-bottom: 0;
  font-weight: 600;
  font-size: 13.5px;
  color: var(--text);
}

.column-header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.copy-btn {
  padding: 3px 12px;
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  border: 1px solid var(--border);
  border-radius: 999px;
  background-color: var(--surface);
  color: var(--primary);
  transition: background-color 0.15s ease, transform 0.1s ease;
}

.copy-btn:hover {
  background-color: var(--primary-soft);
}

.copy-btn:active {
  transform: translateY(1px);
}

.copy-btn.copied {
  background-color: #ecfdf3;
  color: #16a34a;
  border-color: #b7ebc6;
}

.mood-badge {
  font-size: 11.5px;
  font-weight: 700;
  padding: 3px 11px;
  border-radius: 999px;
  background-color: #eceef4;
  color: var(--text-muted);
  white-space: nowrap;
}