/* Theme variables. Each scope redefines the active palette so rules
   below only have to reference `var(--explorer-foo)` once. Order:
   default light  →  @media dark (OS prefers dark)  →  [data-theme="dark"]
   (user toggled dark)  →  [data-theme="light"] (user toggled light, must
   beat the media-query when OS is dark). */
:root {
  --explorer-width: 260px;

  --explorer-bg: #f6f8fa;
  --explorer-border: #d0d7de;
  --explorer-text: #1f2328;
  --explorer-hover: #eaeef2;
  --explorer-current-bg: #ddf4ff;
  --explorer-current-fg: #0969da;
  --explorer-toggle-border: #d0d7de;
  --explorer-toggle-fg: #656d76;
}

@media (prefers-color-scheme: dark) {
  :root {
    --explorer-bg: #161b22;
    --explorer-border: #30363d;
    --explorer-text: #e6edf3;
    --explorer-hover: #21262d;
    --explorer-current-bg: #1f2d3d;
    --explorer-current-fg: #58a6ff;
    --explorer-toggle-border: #484f58;
    --explorer-toggle-fg: #8b949e;
  }
}

[data-theme="dark"] {
  --explorer-bg: #161b22;
  --explorer-border: #30363d;
  --explorer-text: #e6edf3;
  --explorer-hover: #21262d;
  --explorer-current-bg: #1f2d3d;
  --explorer-current-fg: #58a6ff;
  --explorer-toggle-border: #484f58;
  --explorer-toggle-fg: #8b949e;
}

[data-theme="light"] {
  --explorer-bg: #f6f8fa;
  --explorer-border: #d0d7de;
  --explorer-text: #1f2328;
  --explorer-hover: #eaeef2;
  --explorer-current-bg: #ddf4ff;
  --explorer-current-fg: #0969da;
  --explorer-toggle-border: #d0d7de;
  --explorer-toggle-fg: #656d76;
}

/* While the page is in its initial paint, suppress transitions so the
   sidebar (and theme) snap straight to their persisted state instead of
   animating from a default on every navigation. The `preload` class is
   added by an inline script in <head> and removed by file-explorer.js
   on the next animation frame. */
html.preload .file-explorer,
html.preload .explorer-backdrop {
  transition: none !important;
}

/* Sidebar shell */
.file-explorer {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: var(--explorer-width);
  background: var(--explorer-bg);
  border-right: 1px solid var(--explorer-border);
  color: var(--explorer-text);
  overflow-y: auto;
  z-index: 998;
  transform: translateX(-100%);
  transition: transform 0.18s ease-out;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans", Helvetica, Arial, sans-serif;
  font-size: 13px;
  line-height: 1.5;
}

body.explorer-open .file-explorer {
  transform: translateX(0);
}

.file-explorer-header {
  font-weight: 600;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 14px 16px 8px;
  opacity: 0.7;
}

.file-tree {
  padding: 0 8px 16px;
}

/* Override markdown-body list styling that bleeds into the sidebar */
.file-explorer ul,
.file-explorer .file-tree-list {
  list-style: none;
  padding: 0;
  margin: 0;
}
.file-explorer li {
  margin: 0;
  padding: 0;
}
.file-explorer details > ul {
  padding-left: 14px;
  border-left: 1px dashed var(--explorer-border);
  margin-left: 8px;
}

.file-explorer summary {
  cursor: pointer;
  padding: 4px 8px;
  border-radius: 4px;
  user-select: none;
  list-style: none;
  display: flex;
  align-items: center;
  font-weight: 500;
  background: transparent;
}
.file-explorer summary::-webkit-details-marker,
.file-explorer summary::marker {
  display: none;
  content: "";
}
.file-explorer summary::before {
  content: "";
  display: inline-block;
  width: 0;
  height: 0;
  margin-right: 6px;
  border-top: 4px solid transparent;
  border-bottom: 4px solid transparent;
  border-left: 5px solid currentColor;
  opacity: 0.6;
  transition: transform 0.12s;
  transform-origin: 25% 50%;
}
.file-explorer details[open] > summary::before {
  transform: rotate(90deg);
}
.file-explorer summary:hover {
  background: var(--explorer-hover);
}

.file-explorer a {
  display: block;
  padding: 4px 8px 4px 22px;
  border-radius: 4px;
  color: var(--explorer-text);
  text-decoration: none;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.file-explorer a:hover {
  background: var(--explorer-hover);
  text-decoration: none;
}
.file-explorer .current > a {
  background: var(--explorer-current-bg);
  color: var(--explorer-current-fg);
  font-weight: 600;
}

/* Hamburger toggle button */
.explorer-toggle {
  position: fixed;
  top: 20px;
  left: 20px;
  z-index: 1000;
  background: transparent;
  border: 1px solid var(--explorer-toggle-border);
  border-radius: 6px;
  width: 32px;
  height: 32px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  opacity: 0.6;
  transition: opacity 0.15s;
}
.explorer-toggle:hover {
  opacity: 1;
}
.explorer-toggle-icon {
  font-size: 14px;
  line-height: 1;
  color: var(--explorer-toggle-fg);
}

/* Backdrop for mobile overlay */
.explorer-backdrop {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.4);
  z-index: 997;
}

/* Desktop: sidebar pushes content. Use padding on body so the container's
   `margin: 0 auto` keeps the content centered in the remaining space. */
@media (min-width: 768px) {
  body.explorer-open {
    padding-left: var(--explorer-width);
  }
  body.explorer-open .explorer-toggle {
    left: calc(var(--explorer-width) + 20px);
  }
}

/* Mobile: sidebar overlays content with backdrop */
@media (max-width: 767px) {
  body.explorer-open .explorer-backdrop {
    display: block;
  }
  .file-explorer {
    box-shadow: 2px 0 8px rgba(0, 0, 0, 0.1);
  }
}

@media print {
  .explorer-toggle,
  .file-explorer,
  .explorer-backdrop {
    display: none !important;
  }
}