:root {
  --bg: #0b0f19;
  --fg: #e6edf3;
  --muted: #aab6c3;
  --card: #121a2a;
  --border: #23304a;
  --code: #0f1626;
  --accent: #7aa2f7;
  --err: #f7768e;
  --ok: #9ece6a;
}
html, body {
  background: var(--bg);
  color: var(--fg);
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial;
  line-height: 1.65;
  margin: 0;
  height: 100vh;
}
.container {
  display: flex;
  width: 100%;
  height: 100vh;
}
#editor, #preview {
  flex: 1;
  padding: 24px;
  box-sizing: border-box;
  overflow-y: auto;
}
#editor {
  background: var(--bg);
  color: var(--fg);
  border: none;
  border-right: 1px solid var(--border);
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 14px;
  resize: none;
}
#editor:focus {
  outline: none;
}
a { color: var(--accent); }
hr { border: none; border-top: 1px solid var(--border); margin: 24px 0; }
.nm-sec { padding: 0.5em; padding-left: 2em; margin: 1em; border-left: 3px solid var(--border); border-radius: 1em; }
h1, h2, h3, h4, h5, h6 { margin: 18px 0 10px; }
p { margin: 10px 0; }
ul, ol { margin: 10px 0 10px 22px; }
strong { font-weight: 700; }
em { font-style: italic; }
del { text-decoration: line-through; color: var(--muted); }
.nm-image { max-width: 100%; border-radius: 8px; }
.nm-blockquote { border-left: 4px solid var(--border); margin: 12px 0; padding: 8px 16px; background: rgba(255,255,255,0.02); border-radius: 0 8px 8px 0; color: var(--muted); }
.nm-blockquote p { margin: 4px 0; }
.nm-table-wrap { overflow-x: auto; margin: 16px 0; }
.nm-table { border-collapse: collapse; width: 100%; font-size: 14px; }
.nm-table th, .nm-table td { border: 1px solid var(--border); padding: 6px 12px; text-align: left; }
.nm-table thead tr { background: rgba(122,162,247,0.12); }
.nm-table tbody tr:nth-child(even) { background: rgba(255,255,255,0.02); }
.nm-table th { font-weight: 600; color: var(--accent); }
.nm-code-container { border: 1px solid var(--border); border-radius: 12px; background: var(--card); margin: 24px 0; overflow: hidden; }
.nm-code-header { display: flex; align-items: center; gap: 8px; padding: 8px 12px; background: rgba(255,255,255,0.03); border-bottom: 1px solid var(--border); flex-wrap: wrap; }
.nm-badge-main { display: inline-block; padding: 2px 8px; border-radius: 6px; background: #7aa2f7; color: #1a202e; font-size: 11px; font-weight: bold; letter-spacing: .05em; }
.nm-badge-flag { display: inline-block; padding: 2px 8px; border-radius: 6px; border: 1px solid var(--border); background: rgba(0,0,0,0.2); color: var(--muted); font-size: 11px; }
.nm-code-content { position: relative; }
.nm-code { background: var(--code); padding: 12px; overflow: auto; margin: 0; border: none; border-radius: 0; }
.nm-code code { font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace; font-size: 13px; white-space: pre; }
.nm-code-inline { background: rgba(255,255,255,0.06); border: 1px solid rgba(255,255,255,0.10); border-radius: 8px; padding: 1px 6px; font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace; font-size: 0.9em; }

/* Unified Ruby and Anno Styles */
ruby rt {
  font-size: 0.65em;
  color: var(--muted);
  opacity: 0.9;
  line-height: 1;
}
.nm-ruby { ruby-position: over; }
.nm-anno { ruby-position: under; }
.nm-anno rt { font-size: 0.65em; } /* Inherits color from rt rule */
.nm-anno-note { display: inline; }
.nm-anno-note + .nm-anno-note::before { content: ' / '; opacity: 0.6; }

/* Footnotes */
.nm-fn-ref { font-size: 0.75em; vertical-align: super; line-height: 0; }
.nm-fn-ref a { color: var(--accent); text-decoration: none; }
.nm-footnotes { margin-top: 32px; border-top: 1px solid var(--border); padding-top: 12px; font-size: 0.9em; color: var(--muted); }
.nm-footnotes ol { padding-left: 20px; }
.nm-footnotes li { margin: 4px 0; }
.nm-fn-back { color: var(--muted); text-decoration: none; margin-left: 4px; }

/* Card Link */
.nm-card-link { display: block; border: 1px solid var(--border); border-radius: 10px; padding: 12px 16px; margin: 16px 0; background: var(--card); color: var(--fg); text-decoration: none; transition: border-color 0.15s; }
.nm-card-link:hover { border-color: var(--accent); }
.nm-card-url { display: block; font-size: 0.85em; color: var(--muted); word-break: break-all; }

/* Math Styling */
.math-inline { color: var(--muted); }
.math-display {
  display: block;
  padding: 8px 10px;
  margin: 8px 0;
  background: rgba(255,255,255,0.03);
  border: 1px dashed var(--border);
  border-radius: 10px;
}