:root {
  --bg: #f8f9fb;
  --surface: #fff;
  --text: #1a1d23;
  --muted: #5c6370;
  --border: #dde1e8;
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --radius: 8px;
  --font: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --mono: ui-monospace, "Cascadia Code", "Source Code Pro", monospace;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

main {
  max-width: 720px;
  margin: 0 auto;
  padding: 2rem 1.25rem 4rem;
}

h1 {
  margin: 0 0 0.5rem;
  font-size: 1.75rem;
  font-weight: 700;
}

h2 {
  margin: 2rem 0 0.75rem;
  font-size: 1.1rem;
}

.tagline {
  color: var(--muted);
  margin: 0 0 1.5rem;
}

.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
}

label {
  display: block;
  font-weight: 600;
  font-size: 0.875rem;
  margin-bottom: 0.5rem;
}

textarea,
input[type="text"] {
  width: 100%;
  font: inherit;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.75rem;
  background: var(--bg);
}

textarea { resize: vertical; min-height: 10rem; }

.controls {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin: 1rem 0;
}

fieldset {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.5rem 0.75rem;
  margin: 0;
}

legend {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--muted);
  padding: 0 0.25rem;
}

fieldset label {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-weight: 400;
  margin: 0.25rem 0.5rem 0.25rem 0;
}

button,
.link-row a {
  font: inherit;
  font-weight: 600;
  border-radius: var(--radius);
  cursor: pointer;
}

button {
  background: var(--accent);
  color: #fff;
  border: none;
  padding: 0.6rem 1.25rem;
}

button:hover { background: var(--accent-hover); }

.output { margin-top: 1.25rem; }

.link-row {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.link-row input { flex: 1; min-width: 12rem; font-size: 0.8rem; font-family: var(--mono); }

.link-row button,
.link-row a {
  padding: 0.6rem 1rem;
  text-decoration: none;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
}

.link-row a { display: inline-flex; align-items: center; }

.stats {
  font-size: 0.8rem;
  color: var(--muted);
  margin: 0.5rem 0 0;
}

.notes ul {
  margin: 0;
  padding-left: 1.25rem;
  color: var(--muted);
}

.notes code {
  font-family: var(--mono);
  font-size: 0.85em;
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 0.1em 0.35em;
  border-radius: 4px;
}

.hidden { display: none !important; }

/* Viewer */
.viewer-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
  font-size: 0.875rem;
}

.viewer-header a {
  color: var(--accent);
  text-decoration: none;
}

.viewer-header a:hover { text-decoration: underline; }

.viewer-header span {
  color: var(--muted);
  font-weight: 600;
}

.rendered {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem 1.75rem;
}

.empty {
  color: var(--muted);
  text-align: center;
  padding: 3rem 1rem;
}

/* Markdown typography */
.markdown-body h1, .markdown-body h2, .markdown-body h3 {
  margin-top: 1.5em;
  margin-bottom: 0.5em;
  line-height: 1.3;
}

.markdown-body h1:first-child,
.markdown-body h2:first-child,
.markdown-body h3:first-child { margin-top: 0; }

.markdown-body p { margin: 0.75em 0; }
.markdown-body ul, .markdown-body ol { padding-left: 1.5em; }
.markdown-body li { margin: 0.25em 0; }

.markdown-body a {
  color: var(--accent);
  word-break: break-all;
}

.markdown-body code {
  font-family: var(--mono);
  font-size: 0.9em;
  background: var(--bg);
  padding: 0.15em 0.4em;
  border-radius: 4px;
}

.markdown-body pre {
  background: var(--bg);
  padding: 1rem;
  border-radius: var(--radius);
  overflow-x: auto;
}

.markdown-body pre code {
  background: none;
  padding: 0;
}

.markdown-body blockquote {
  margin: 1em 0;
  padding-left: 1em;
  border-left: 3px solid var(--border);
  color: var(--muted);
}