* { box-sizing: border-box; }
:root {
  --bg: #f6f8fa;
  --text: #24292f;
  --muted: #57606a;
  --panel: #ffffff;
  --border: #d0d7de;
  --subtle: #f6f8fa;
  --accent: #0969da;
  --code-bg: #0d1117;
  --code-text: #f6f8fa;
}
body[data-theme="night"] {
  --bg: #0d1117;
  --text: #e6edf3;
  --muted: #8b949e;
  --panel: #161b22;
  --border: #30363d;
  --subtle: #161b22;
  --accent: #58a6ff;
  --code-bg: #010409;
  --code-text: #e6edf3;
}
body {
  margin: 0;
  font-family: Inter, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg);
  color: var(--text);
}
.page {
  max-width: 1280px;
  margin: 0 auto;
  padding: 32px 20px 64px;
}
.topbar {
  display: flex;
  justify-content: space-between;
  align-items: end;
  gap: 16px;
  margin-bottom: 24px;
}
.topbar-actions {
  display: flex;
  align-items: center;
  gap: 14px;
}
.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 11px;
  color: var(--muted);
  margin: 0 0 8px;
}
h1,
h2,
h3,
h4 { margin: 0 0 12px; }
h1 { font-size: 2rem; }
h2 { font-size: 1.5rem; }
h3 { font-size: 1.2rem; }
.meta { color: var(--muted); font-size: 14px; }
.theme-toggle {
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--text);
  border-radius: 999px;
  width: 42px;
  height: 42px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 18px;
}
.tabs {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 20px;
}
.tab {
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--text);
  padding: 10px 14px;
  border-radius: 999px;
  cursor: pointer;
  font-size: 14px;
}
.tab.active {
  background: var(--text);
  color: var(--bg);
  border-color: var(--text);
}
.tab-panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 22px;
}
.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 18px;
}
.panel-header span {
  color: var(--muted);
  font-size: 13px;
}
.toolbar {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 18px;
}
.toolbar label {
  font-weight: 600;
}
.file-select {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 8px 10px;
  font-size: 14px;
  min-width: 260px;
  background: var(--panel);
  color: var(--text);
}
.file-card {
  border-top: 1px solid var(--border);
  padding: 18px 0;
}
.file-card:first-of-type { border-top: none; }
.file-card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.markdown-body {
  line-height: 1.7;
  font-size: 15px;
  color: var(--text);
}
.markdown-body > :first-child { margin-top: 0; }
.markdown-body h2,
.markdown-body h3,
.markdown-body h4 {
  margin-top: 24px;
  margin-bottom: 12px;
  border-bottom: 1px solid var(--border);
  padding-bottom: 6px;
}
.markdown-body p,
.markdown-body li {
  margin: 0 0 10px;
}
.markdown-body ul,
.markdown-body ol {
  padding-left: 22px;
}
.markdown-body a {
  color: var(--accent);
  text-decoration: none;
}
.markdown-body a:hover { text-decoration: underline; }
.markdown-body blockquote {
  margin: 0 0 12px;
  padding: 10px 14px;
  border-left: 3px solid var(--border);
  background: var(--subtle);
}
.markdown-body pre {
  background: var(--code-bg);
  color: var(--code-text);
  padding: 14px;
  border-radius: 10px;
  overflow-x: auto;
  margin: 12px 0;
}
.markdown-body code {
  font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
  font-size: 0.93em;
  background: rgba(175, 184, 193, 0.2);
  padding: 0.15em 0.3em;
  border-radius: 6px;
}
.markdown-body pre code {
  background: transparent;
  padding: 0;
}
.markdown-body table {
  width: 100%;
  border-collapse: collapse;
  overflow: hidden;
  margin: 16px 0;
  border: 1px solid var(--border);
  border-radius: 8px;
}
.markdown-body th,
.markdown-body td {
  border: 1px solid var(--border);
  padding: 10px 12px;
  text-align: left;
  vertical-align: top;
}
.markdown-body th {
  background: var(--subtle);
}
.markdown-body strong { font-weight: 700; }
.markdown-body em { font-style: italic; }
.spacer { height: 8px; }
[hidden] { display: none; }
@media (max-width: 720px) {
  .topbar, .panel-header, .toolbar, .topbar-actions { flex-direction: column; align-items: flex-start; }
  .file-select { min-width: 100%; }
}