:root {
  --bg-canvas: #0d1117;
  --bg-subtle: #161b22;
  --border: #30363d;
  --border-muted: #21262d;
  --fg-default: #c9d1d9;
  --fg-muted: #8b949e;
  --accent: #58a6ff;
  --accent-emphasis: #1f6feb;
  --success: #3fb950;
  --btn-bg: #21262d;
  --btn-border: #30363d;
  --logo-circle: #ffffff;
  --logo-mark: #000000;
  --font-ui: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Consolas, "Liberation Mono", Menlo, monospace;
}

:root[data-theme="light"] {
  --bg-canvas: #ffffff;
  --bg-subtle: #f6f8fa;
  --border: #d0d7de;
  --border-muted: #d8dee4;
  --fg-default: #1f2328;
  --fg-muted: #656d76;
  --accent: #0969da;
  --accent-emphasis: #0969da;
  --success: #1a7f37;
  --btn-bg: #f6f8fa;
  --btn-border: #d0d7de;
  --logo-circle: #000000;
  --logo-mark: #ffffff;
}

:root[data-theme="light"] .markdown-body code {
  background: rgba(175, 184, 193, 0.2);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg-canvas);
  color: var(--fg-default);
  font-family: var(--font-ui);
  font-size: 14px;
  line-height: 1.5;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* Header */
.gh-header {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 16px 24px;
  border-bottom: 1px solid var(--border);
  background: var(--bg-canvas);
}
.gh-header .octicon {
  width: 32px;
  height: 32px;
  color: var(--fg-default);
}
.logo-circle { fill: var(--logo-circle); }
.logo-mark { fill: var(--logo-mark); }
.gh-repo-name {
  font-size: 20px;
  font-weight: 600;
}
.gh-repo-name .owner { color: var(--fg-muted); font-weight: 400; }
.theme-switch-wrap {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}

.theme-icon {
  color: var(--fg-default);
}
.theme-icon.moon-icon { display: none; }
:root[data-theme="dark"] .theme-icon.sun-icon { display: none; }
:root[data-theme="dark"] .theme-icon.moon-icon { display: inline-block; }

.theme-switch {
  position: relative;
  width: 34px;
  height: 19px;
  padding: 0;
  border-radius: 999px;
  border: 1px solid var(--btn-border);
  background: var(--btn-bg);
  cursor: pointer;
  transition: background 0.15s ease, border-color 0.15s ease;
}
.theme-switch-knob {
  position: absolute;
  top: 1px;
  left: 1px;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  background: var(--fg-muted);
  transition: transform 0.15s ease, background 0.15s ease;
}
:root[data-theme="light"] .theme-switch {
  background: var(--accent);
  border-color: var(--accent);
}
:root[data-theme="light"] .theme-switch-knob {
  transform: translateX(15px);
  background: #ffffff;
}

.gh-visibility {
  font-size: 12px;
  border: 1px solid var(--border);
  border-radius: 2em;
  padding: 0 7px;
  color: var(--fg-muted);
}

/* Nav tabs */
.gh-tabs {
  display: flex;
  gap: 4px;
  padding: 0 24px;
  border-bottom: 1px solid var(--border);
}
.gh-tabs a {
  padding: 12px 8px;
  color: var(--fg-muted);
  font-size: 14px;
  border-bottom: 2px solid transparent;
}
.gh-tabs a.active {
  color: var(--fg-default);
  font-weight: 600;
  border-bottom-color: #f78166;
}

/* Layout */
.gh-container {
  max-width: 1012px;
  margin: 24px auto;
  padding: 0 24px;
}

/* Breadcrumb */
.gh-breadcrumb {
  font-family: var(--font-mono);
  font-size: 20px;
  margin-bottom: 16px;
  color: var(--fg-muted);
}
.gh-breadcrumb .current { color: var(--fg-default); }

/* File table (repo file listing) */
.gh-file-table {
  border: 1px solid var(--border);
  border-radius: 6px;
  overflow: hidden;
}
.gh-file-table .latest-commit {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 16px;
  background: var(--bg-subtle);
  border-bottom: 1px solid var(--border);
  color: var(--fg-muted);
  font-size: 13px;
}
.gh-file-table .latest-commit strong { color: var(--fg-default); font-weight: 600; }

.gh-file-row {
  display: flex;
  align-items: center;
  padding: 8px 16px;
  border-bottom: 1px solid var(--border-muted);
  gap: 8px;
}
.gh-file-row:last-child { border-bottom: none; }
.gh-file-row:hover { background: var(--bg-subtle); }

.gh-file-row .icon { color: var(--accent); flex-shrink: 0; width: 16px; }
.gh-file-row .icon.folder { color: var(--accent); }
.gh-file-row .name { flex: 0 0 auto; min-width: 180px; }
.gh-file-row .name a { color: var(--fg-default); }
.gh-file-row .name a:hover { color: var(--accent); }
.gh-file-row .message {
  flex: 1 1 auto;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  color: var(--fg-muted);
}
.gh-file-row .date {
  flex-shrink: 0;
  color: var(--fg-muted);
  font-size: 12px;
}

/* Section divider inside the file table (e.g. "Folders") */
.gh-file-row.section-label {
  padding: 6px 16px;
  background: var(--bg-subtle);
  border-bottom: 1px solid var(--border);
  color: var(--fg-muted);
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.gh-file-row.section-label:hover { background: var(--bg-subtle); }

/* README-style panel */
.gh-readme {
  margin-top: 24px;
  border: 1px solid var(--border);
  border-radius: 6px;
}
.gh-readme .header {
  padding: 16px;
  background: var(--bg-subtle);
  border-bottom: 1px solid var(--border);
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 8px;
}
.gh-readme .body { padding: 16px 24px; }

/* Blob (post) view */
.gh-blob-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border: 1px solid var(--border);
  border-bottom: none;
  border-radius: 6px 6px 0 0;
  padding: 8px 16px;
  background: var(--bg-subtle);
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--fg-muted);
}
.gh-blob-body {
  border: 1px solid var(--border);
  border-radius: 0 0 6px 6px;
  padding: 32px 48px;
}

/* Post meta (tags, date) */
.post-meta {
  display: flex;
  gap: 12px;
  align-items: center;
  color: var(--fg-muted);
  font-size: 13px;
  margin-bottom: 24px;
}
.post-tag {
  border: 1px solid var(--border);
  border-radius: 2em;
  padding: 2px 10px;
  font-size: 12px;
  color: var(--accent);
}

/* Markdown body typography (GitHub-flavored) */
.markdown-body h1, .markdown-body h2, .markdown-body h3,
.markdown-body h4, .markdown-body h5, .markdown-body h6 {
  font-weight: 600;
  margin-top: 24px;
  margin-bottom: 16px;
  line-height: 1.25;
  border-bottom: 1px solid var(--border-muted);
  padding-bottom: 0.3em;
}
.markdown-body h1 { font-size: 2em; }
.markdown-body h2 { font-size: 1.5em; }
.markdown-body h3 { font-size: 1.25em; border-bottom: none; }
.markdown-body h4, .markdown-body h5, .markdown-body h6 { border-bottom: none; }
.markdown-body p { margin: 0 0 16px; }
.markdown-body ul, .markdown-body ol { padding-left: 2em; margin-bottom: 16px; }
.markdown-body li { margin-bottom: 4px; }
.markdown-body blockquote {
  margin: 0 0 16px;
  padding: 0 1em;
  color: var(--fg-muted);
  border-left: 4px solid var(--border);
}
.markdown-body code {
  background: rgba(110, 118, 129, 0.4);
  padding: 0.2em 0.4em;
  border-radius: 6px;
  font-family: var(--font-mono);
  font-size: 85%;
}
.markdown-body pre {
  background: var(--bg-subtle);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 16px;
  overflow-x: auto;
  margin-bottom: 16px;
}
.markdown-body pre code {
  background: none;
  padding: 0;
  font-size: 85%;
}
.markdown-body img { max-width: 100%; }
.markdown-body a { color: var(--accent); }
.markdown-body hr {
  border: none;
  border-top: 1px solid var(--border-muted);
  margin: 24px 0;
}

/* Footer */
.gh-footer {
  max-width: 1012px;
  margin: 48px auto 24px;
  padding: 16px 24px;
  border-top: 1px solid var(--border);
  color: var(--fg-muted);
  font-size: 12px;
}

.loading { color: var(--fg-muted); padding: 24px 0; }