:root {
  --bg: #0d0d0d;
  --bg-alt: #141414;
  --bg-sidebar: #1a1a1a;
  --bg-hover: #262626;
  --bg-active: #333;
  --bg-code: #1a1a1a;
  --text: #e5e5e5;
  --text-dim: #a3a3a3;
  --text-muted: #525252;
  --border: #262626;
}

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html,
body {
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 0.875rem;
  overflow: hidden;
}

body {
  display: flex;
  flex-direction: column;
}

a {
  color: inherit;
  text-decoration: none;
}

#top-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 40px;
  padding: 0 12px;
  background: var(--bg-sidebar);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

#app-title {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--text-dim);
  letter-spacing: 0.04em;
}

#top-bar-actions {
  display: flex;
  align-items: center;
  gap: 6px;
}

.btn-top {
  height: 28px;
  padding: 0 8px;
  background: var(--bg-hover);
  color: var(--text-dim);
  border: none;
  border-radius: 4px;
  font-size: 0.75rem;
  font-weight: 600;
  cursor: pointer;
  transition: background-color 0.15s, color 0.15s;
  display: flex;
  align-items: center;
  gap: 4px;
}
.btn-top:hover {
  background: var(--bg-active);
  color: var(--text);
}

.dropdown {
  position: relative;
}

.dropdown-content {
  position: absolute;
  top: 32px;
  right: 0;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 4px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.5);
  z-index: 10;
  min-width: 140px;
  overflow: hidden;
}
.dropdown-content.hidden {
  display: none;
}

.dropdown-content button {
  width: 100%;
  padding: 8px 12px;
  text-align: left;
  background: none;
  border: none;
  color: var(--text-dim);
  font-size: 0.8125rem;
  cursor: pointer;
  transition: background-color 0.1s, color 0.1s;
}
.dropdown-content button:hover {
  background: var(--bg-hover);
  color: var(--text);
}
.dropdown-content button.danger:hover {
  background: #ef4444;
  color: #fff;
}

.dropdown-content hr {
  border: none;
  border-top: 1px solid var(--border);
}

#main-container {
  flex: 1;
  display: flex;
  overflow: hidden;
}

#main-container.split {
  flex-direction: row;
}

#editor-container {
  flex: 1;
  min-width: 0;
  background: var(--bg);
  overflow: hidden;
  position: relative;
}

#main-container.split #editor-container {
  flex: none;
}

#splitter {
  display: none;
  width: 6px;
  margin: 0 -3px;
  background: var(--bg-sidebar);
  cursor: col-resize;
  flex-shrink: 0;
  transition: background-color 0.15s;
  z-index: 1;
}
#splitter:hover {
  background: var(--bg-active);
}
#main-container.split #splitter {
  display: block;
}

#editor {
  width: 100%;
  height: 100%;
  background: var(--bg);
  color: var(--text);
  padding: 1rem;
  font-size: 0.875rem;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  border: none;
  resize: none;
  border-radius: 0.25rem;
}

#preview-container {
  flex: 1;
  min-width: 0;
  background: var(--bg);
  overflow-y: auto;
  position: relative;
}

.light-toggle {
  position: absolute;
  top: 8px;
  right: 8px;
  z-index: 5;
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 0.875rem;
  cursor: pointer;
  padding: 4px;
  border-radius: 4px;
  transition: color 0.15s, background-color 0.15s;
}
.light-toggle:hover {
  color: var(--text);
  background: var(--bg-hover);
}
.light-toggle.on {
  color: #f59e0b;
}
.light-toggle.on:hover {
  color: #fbbf24;
}

#preview {
  max-width: none;
  padding: 1rem;
  font-family: -apple-system, "BlinkMacSystemFont", "Segoe UI", "Noto Sans", Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji";
  font-size: 16px;
  line-height: 1.5;
  word-wrap: break-word;
}

.CodeMirror {
  height: 100% !important;
  word-wrap: break-word !important;
  white-space: pre-wrap !important;
  width: 100% !important;
  max-width: 100% !important;
  overflow-x: hidden !important;
}
#editor-container:not(.light) .CodeMirror {
  background-color: var(--bg-alt) !important;
  color: #abb2bf !important;
}
#editor-container:not(.light) .CodeMirror-gutters {
  background-color: var(--bg-alt) !important;
  border-right: 1px solid var(--border) !important;
}
#editor-container:not(.light) .CodeMirror-cursor {
  border-left-color: #abb2bf !important;
}

.cm-header { color: #e06c75 !important; }
.cm-quote { color: #98c379 !important; }
.cm-link { color: #61afef !important; }
.cm-url { color: #56b6c2 !important; }
.cm-strong { color: #d19a66 !important; }
.cm-em { color: #c678dd !important; }
.cm-string { color: #98c379 !important; }
.cm-comment { color: #5c6370 !important; }
.cm-list { color: #e06c75 !important; }

#preview h1 {
  font-size: 2em;
  font-weight: 600;
  margin: 24px 0 16px;
  padding-bottom: 0.3em;
  border-bottom: 1px solid var(--border);
}
#preview h2 {
  font-size: 1.5em;
  font-weight: 600;
  margin: 24px 0 16px;
  padding-bottom: 0.3em;
  border-bottom: 1px solid var(--border);
}
#preview h3 {
  font-size: 1.25em;
  font-weight: 600;
  margin: 24px 0 16px;
}
#preview h4 {
  font-size: 1em;
  font-weight: 600;
  margin: 24px 0 16px;
}
#preview h5 {
  font-size: 0.875em;
  font-weight: 600;
  margin: 24px 0 16px;
}
#preview h6 {
  font-size: 0.85em;
  font-weight: 600;
  color: var(--text-dim);
  margin: 24px 0 16px;
}
#preview p {
  margin: 0 0 16px;
}
#preview strong {
  font-weight: 600;
}
#preview em {
  font-style: italic;
}
#preview a {
  color: #60a5fa;
  text-decoration: underline;
}
#preview a:hover {
  color: #93c5fd;
  text-decoration: none;
}
#preview blockquote {
  border-left: 0.25em solid var(--border);
  padding: 0 1em;
  color: var(--text-dim);
  margin: 0 0 16px;
}
#preview code {
  background: var(--bg-code);
  color: #f5f5f5;
  padding: 0.2em 0.4em;
  border-radius: 6px;
  font-size: 85%;
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
}
#preview pre {
  background: var(--bg-code);
  color: #f5f5f5;
  padding: 16px;
  border-radius: 6px;
  font-size: 85%;
  line-height: 1.45;
  overflow-x: auto;
  margin: 0 0 16px;
}
#preview pre code {
  background: none;
  padding: 0;
  font-size: 100%;
  border-radius: 0;
}
#preview hr {
  border: none;
  border-bottom: 1px solid var(--border);
  height: 0.25em;
  margin: 24px 0;
  background-color: var(--border);
}
#preview ul,
#preview ol {
  padding-left: 2em;
  margin: 0 0 16px;
}
#preview ul {
  list-style: disc;
}
#preview ol {
  list-style: decimal;
}
#preview ul ul,
#preview ol ul {
  list-style: circle;
}
#preview ul ul ul,
#preview ol ul ul {
  list-style: square;
}
#preview li {
  margin: 0.25em 0;
}
#preview li > p {
  margin: 16px 0;
}
#preview table {
  width: 100%;
  border-collapse: collapse;
  margin: 0 0 16px;
  display: block;
  overflow-x: auto;
}
#preview thead th {
  border-bottom: 1px solid var(--border);
  font-weight: 600;
  padding: 6px 13px;
}
#preview tr {
  border-bottom: 1px solid var(--bg-hover);
  border-top: 1px solid var(--bg-hover);
}
#preview th,
#preview td {
  padding: 6px 13px;
  vertical-align: top;
}
#preview tr:nth-child(even) {
  background: var(--bg-code);
}
#preview img {
  max-width: 100%;
  box-sizing: content-box;
  margin: 0 0 16px;
}
#preview sup a {
  font-size: 0.75rem;
}

#preview .task-list-item {
  list-style: none;
}
#preview .task-list-item input[type="checkbox"] {
  margin: 0 0.2em 0.25em -1.4em;
  vertical-align: middle;
}

.markdown-alert {
  padding: 0.5rem 1rem;
  margin-bottom: 16px;
  border-left: 0.25em solid;
  border-radius: 0;
  color: inherit;
}
.markdown-alert > :last-child { margin-bottom: 0; }
.markdown-alert-title {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}
.markdown-alert-title svg { flex-shrink: 0; }
.markdown-alert-note {
  border-left-color: #0969da;
}
.markdown-alert-note .markdown-alert-title { color: #0969da; }
.markdown-alert-note .markdown-alert-title svg { fill: #0969da; }
.markdown-alert-tip {
  border-left-color: #1a7f37;
}
.markdown-alert-tip .markdown-alert-title { color: #1a7f37; }
.markdown-alert-tip .markdown-alert-title svg { fill: #1a7f37; }
.markdown-alert-important {
  border-left-color: #8250df;
}
.markdown-alert-important .markdown-alert-title { color: #8250df; }
.markdown-alert-important .markdown-alert-title svg { fill: #8250df; }
.markdown-alert-warning {
  border-left-color: #9a6700;
}
.markdown-alert-warning .markdown-alert-title { color: #9a6700; }
.markdown-alert-warning .markdown-alert-title svg { fill: #9a6700; }
.markdown-alert-caution {
  border-left-color: #cf222e;
}
.markdown-alert-caution .markdown-alert-title { color: #cf222e; }
.markdown-alert-caution .markdown-alert-title svg { fill: #cf222e; }

code.color-swatch::before {
  content: "";
  display: inline-block;
  width: 1em;
  height: 1em;
  border-radius: 3px;
  margin-right: 0.25em;
  vertical-align: middle;
  background-color: var(--swatch-color);
  border: 1px solid var(--border);
}

.footnotes {
  margin-top: 32px;
  border-top: 1px solid var(--border);
  padding-top: 16px;
  font-size: 0.875em;
  color: var(--text-dim);
}
.footnotes h2 {
  font-size: 1em;
  font-weight: 600;
  border-bottom: none;
  padding-bottom: 0;
}
.footnotes ol { padding-left: 1.5em; }
.footnotes li { margin: 0.5em 0; }
.footnotes [data-footnote-backref] {
  text-decoration: none;
  margin-left: 0.25em;
}
#preview [data-footnote-ref] {
  scroll-margin-top: 80px;
}

.modal {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
}
.modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
}
.modal-content {
  position: relative;
  background: var(--bg-sidebar);
  border: 1px solid var(--border);
  border-radius: 6px;
  max-width: 600px;
  max-height: 80vh;
  width: 90%;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}
.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
}
.modal-header h2 {
  font-size: 1rem;
  font-weight: 700;
}
.modal-close {
  background: none;
  border: none;
  color: var(--text-dim);
  font-size: 1.25rem;
  cursor: pointer;
  padding: 0;
  line-height: 1;
}
.modal-close:hover {
  color: var(--text);
}
.modal-body {
  padding: 16px;
  overflow-y: auto;
  line-height: 1.5;
}
.modal-body h3 {
  font-weight: 600;
  margin-top: 1rem;
  margin-bottom: 0.25rem;
  font-size: 0.875rem;
}
.modal-body p {
  font-size: 0.8125rem;
  color: var(--text-dim);
}
.modal-body code {
  font-size: 0.8125rem;
  background: var(--bg-hover);
  padding: 0.125rem 0.25rem;
  border-radius: 0.25rem;
}
.modal-body pre {
  margin: 0.25rem 0 0.75rem;
  background: var(--bg);
  padding: 0.5rem;
  border-radius: 0.25rem;
  overflow-x: auto;
}
.modal-body pre code {
  background: none;
  padding: 0;
  font-size: 0.75rem;
  color: var(--text-dim);
}

#editor-container.light {
  --bg: #fff;
  --bg-alt: #f5f5f5;
  --text: #1a1a1a;
  --border: #e0e0e0;
}
#editor-container.light .CodeMirror {
  background-color: var(--bg) !important;
  color: var(--text) !important;
}
#editor-container.light .CodeMirror-gutters {
  background-color: var(--bg-alt) !important;
  border-right-color: var(--border) !important;
}

#preview-container.light {
  --bg: #fff;
  --text: #1a1a1a;
  --text-dim: #525252;
  --bg-code: #f0f0f0;
  --bg-hover: #e5e5e5;
  --border: #e0e0e0;
  background: var(--bg);
  color: var(--text);
}
#preview-container.light #preview code {
  background: var(--bg-code);
  color: var(--text);
}
#preview-container.light #preview pre {
  background: var(--bg-code);
  color: var(--text);
}
#preview-container.light #preview tr:nth-child(even) {
  background: var(--bg-code);
}
#preview-container.light #preview thead th,
#preview-container.light #preview tr {
  border-color: var(--border);
}
#preview-container.light #preview blockquote {
  border-color: var(--border);
}
#preview-container.light #preview hr {
  border-color: var(--bg-hover);
}
#preview-container.light #preview a {
  color: #2563eb;
}
#preview-container.light #preview a:hover {
  color: #1d4ed8;
}