:root {
  --bg: #ffffff;
  --fg: #1f2328;
  --muted: #59636e;
  --border: #d1d9e0;
  --accent: #0969da;
  --code-bg: #f6f8fa;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d1117;
    --fg: #e6edf3;
    --muted: #9198a1;
    --border: #30363d;
    --accent: #4493f8;
    --code-bg: #161b22;
  }
}

* { box-sizing: border-box; }
html, body { margin: 0; }
body {
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
}

.topbar {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  background: var(--bg);
  z-index: 1;
}
.title { font-size: 1.1rem; margin: 0; margin-right: auto; }
.actions { display: flex; gap: 0.5rem; }
.actions button {
  font: inherit;
  padding: 0.4rem 0.8rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--code-bg);
  color: var(--fg);
  cursor: pointer;
}
.actions button:hover { border-color: var(--accent); }

#paste-area {
  display: block;
  width: 100%;
  min-height: 8rem;
  padding: 1rem;
  border: none;
  border-bottom: 1px solid var(--border);
  background: var(--code-bg);
  color: var(--fg);
  font: 14px/1.5 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  resize: vertical;
}

.content {
  max-width: 48rem;
  margin: 0 auto;
  padding: 2rem 1rem 4rem;
  word-wrap: break-word;
}
.placeholder { color: var(--muted); }

/* Rendered markdown */
.content h1, .content h2 { border-bottom: 1px solid var(--border); padding-bottom: 0.3em; }
.content h1, .content h2, .content h3, .content h4 { margin-top: 1.5em; line-height: 1.25; }
.content a { color: var(--accent); }
.content img { max-width: 100%; }
.content code {
  background: var(--code-bg);
  padding: 0.2em 0.4em;
  border-radius: 6px;
  font: 0.9em ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}
.content pre {
  background: var(--code-bg);
  padding: 1rem;
  border-radius: 8px;
  overflow-x: auto;
}
.content pre code { background: none; padding: 0; }
.content blockquote {
  margin: 1em 0;
  padding: 0 1em;
  color: var(--muted);
  border-left: 0.25em solid var(--border);
}
.content table { border-collapse: collapse; display: block; overflow-x: auto; }
.content th, .content td { border: 1px solid var(--border); padding: 0.4em 0.8em; }
.content hr { border: none; border-top: 1px solid var(--border); }