/* ============================================================
   The Fold Within — Styles v2.6.2
   Independent Scroll + Desktop Collapse + Overlap Fix
   ============================================================ */

:root {
  --bg: #0b0c10;
  --fg: #f3f3f3;
  --accent: #d0aa5b;
  --muted: #8d8f95;
  --line: #2a2d34;
}

/* Base */
html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: system-ui, sans-serif;
  height: 100%;
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
}

/* ============================================================
   Topbar
   ============================================================ */
.topbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: 48px;
  display: flex;
  align-items: center;
  gap: 1em;
  background: #111;
  padding: 0 1em;
  z-index: 300;
  box-shadow: 0 2px 8px rgba(0,0,0,.3);
}
.topbar a {
  color: var(--accent);
  text-decoration: none;
  font-weight: 500;
}
.topbar a:hover { color: var(--fg); }
.topbar button {
  font-size: 24px;
  background: transparent;
  color: var(--accent);
  border: none;
  padding: 4px 8px;
  cursor: pointer;
}
.topbar button:hover { color: var(--fg); }

/* ============================================================
   Layout Containers
   ============================================================ */
.page {
  display: flex;
  position: relative;
  height: calc(100vh - 48px);
  margin-top: 48px;
  overflow: hidden;
}

/* ============================================================
   Sidebar (base shared)
   ============================================================ */
.sidebar {
  background: #111;
  width: 280px;
  overflow-y: auto;
  transform: translateX(0);
  transition: transform .3s ease, width .3s ease;
  padding: 10px;
  z-index: 200;
  border-right: 1px solid var(--line);
}

/* collapsed (desktop + mobile toggle) */
.sidebar.collapsed {
  transform: translateX(-280px);
}

.overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.45);
  backdrop-filter: blur(4px);
  opacity: 0;
  pointer-events: none;
  transition: opacity .3s ease;
  z-index: 150;
}
.sidebar.open ~ .overlay {
  opacity: 1;
  pointer-events: all;
}

/* ============================================================
   Desktop Sidebar (≥900px)
   ============================================================ */
@media (min-width:900px){
  .sidebar {
    position: fixed;
    top: 48px;
    bottom: 0;
    left: 0;
    width: 280px;
    transform: none;
  }
  .sidebar.collapsed {
    transform: translateX(-280px);
  }
}

/* ============================================================
   Content Area
   ============================================================ */
.content {
  flex: 1;
  position: relative;
  overflow-y: auto;
  overflow-x: hidden;
  padding: 16px;
  box-sizing: border-box;
  max-width: 960px;
  margin-left: 280px;
  transition: margin-left .3s ease;
}
.content.full {
  margin-left: 0;
}
@media(max-width:899px){
  .content { margin-left: 0; padding: 12px; }
}

/* ============================================================
   Viewer + HTML Frame
   ============================================================ */
.viewer, #htmlView {
  display: block;
  width: 100%;
  flex: 1 1 auto;
  margin-top: 0;
  padding-top: 0;
  min-height: calc(100vh - 48px);
  overflow-y: auto;
  transition: opacity .25s ease;
}
.viewer.fade-in, #htmlView.fade-in { opacity: 1; }
.viewer:not(.fade-in), #htmlView:not(.fade-in) { opacity: 0; }
#htmlView { border: none; background: #0b0c10; }

/* ============================================================
   Markdown Formatting
   ============================================================ */
#mdView h1, #mdView h2, #mdView h3 { color: var(--accent); }
#mdView pre, #mdView code {
  overflow-x: auto;
  background: #111;
  padding: .5em;
  border-radius: 4px;
  color: var(--accent);
}
#mdView blockquote {
  border-left: 3px solid var(--accent);
  padding-left: 12px;
  color: var(--muted);
  font-style: italic;
}
#mdView a { color: var(--accent); }
#mdView img { max-width: 100%; border-radius: 8px; }

/* ============================================================
   Warnings + Meta + Pager
   ============================================================ */
.md-warn {
  background: #3b0c0c;
  color: #ffd4d4;
  border: 1px solid #6c1f1f;
  border-radius: 8px;
  padding: 10px 12px;
  margin: 10px auto;
  max-width: 820px;
}
.meta { color: var(--muted); margin-bottom: 12px; font-size: .9em; }

.pager {
  display: flex;
  justify-content: space-between;
  padding: 8px 0;
}
button#prev, button#next {
  background: transparent;
  border: 1px solid var(--line);
  color: var(--fg);
  border-radius: 8px;
  padding: 4px 10px;
  cursor: pointer;
}
button#prev:hover, button#next:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* ============================================================
   Tree + Controls
   ============================================================ */
.controls { display: flex; gap: .5em; margin-bottom: 8px; }
select, #search {
  background: #0b0c10;
  color: var(--fg);
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 6px;
}
.dir .label {
  display: flex;
  align-items: center;
  cursor: pointer;
  padding: 4px 6px;
  color: var(--accent);
  font-weight: 600;
}
.dir .label::before {
  content: "▶";
  margin-right: 6px;
  font-size: .8em;
  color: var(--muted);
}
.dir.open .label::before { content: "▼"; }

/* ============================================================
   Mobile (≤899px)
   ============================================================ */
@media (max-width:899px){
  .sidebar {
    position: fixed !important;
    top: 48px !important;
    bottom: 0 !important;
    left: 0 !important;
    width: 85% !important;
    max-width: 320px !important;
    background: #111 !important;
    transform: translateX(-100%) !important;
    transition: transform .3s ease;
    overflow-y: auto;
    z-index: 200 !important;
  }
  .sidebar.open { transform: translateX(0) !important; }
  .overlay { opacity: 0; pointer-events: none; }
  .sidebar.open ~ .overlay {
    opacity: 1; pointer-events: all;
  }
  main.content {
    margin-left: 0 !important;
    height: auto !important;
    overflow-y: auto;
    padding: 12px;
  }
}