/* ============================================
   CROSSSECTIONS - Minimal Base Styles
   ============================================ */

*,
*::before,
*::after {
  box-sizing: border-box;
}

:root {
  --bg: #ffffff;
  --fg: #1a1a1a;
  --muted: #666;
  --border: #ccc;
  --mono: ui-monospace, "SF Mono", Menlo, Monaco, monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d0d0d;
    --fg: #e5e5e5;
    --muted: #888;
    --border: #333;
  }
}

body {
  margin: 0;
  padding: 2rem;
  font-family: system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--fg);
  line-height: 1.5;
}

/* Layout */
.container {
  max-width: 960px;
  margin: 0 auto;
}

/* Header */
header {
  margin-bottom: 3rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border);
}

header h1 {
  margin: 0 0 0.5rem 0;
  font-size: 1.5rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}

header p {
  margin: 0;
  color: var(--muted);
  font-size: 0.875rem;
}

/* Navigation / Links */
nav {
  margin: 2rem 0;
}

nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

nav a {
  display: flex;
  align-items: baseline;
  gap: 1rem;
  padding: 1rem;
  border: 1px dashed var(--border);
  border-radius: 4px;
  text-decoration: none;
  color: var(--fg);
  opacity: 0.7;
  transition: opacity 0.15s;
}

nav a:hover {
  opacity: 1;
}

nav .link-title {
  font-weight: 500;
}

nav .link-desc {
  font-family: var(--mono);
  font-size: 0.7rem;
  color: var(--muted);
}

/* Labels */
.label {
  font-family: var(--mono);
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--muted);
}

/* Footer */
footer {
  margin-top: 4rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
  font-size: 0.75rem;
  color: var(--muted);
}

footer a {
  color: inherit;
  text-decoration: none;
}

footer a:hover {
  text-decoration: underline;
}

/* ============================================
   File Tree
   ============================================ */

.file-tree {
  font-family: var(--mono);
  font-size: 0.875rem;
  margin: 2rem 0;
}

.file-tree > a {
  display: block;
  color: var(--fg);
  text-decoration: none;
  margin-bottom: 0.25rem;
}

.tree-item {
  line-height: 1.8;
}

.tree-branch {
  color: var(--border);
}

.tree-num {
  color: var(--muted);
}

.file-tree .tree-item a {
  color: var(--fg);
  text-decoration: none;
  opacity: 0.7;
  transition: opacity 0.15s;
}

.file-tree .tree-item a:hover {
  opacity: 1;
}